Throughout the centuries many authors have attempt Essay Example For Students

Throughout the centuries many authors have attempt Essay ed to capture the individuals quest for self-authenticity. In the novel Song of Solomon, Toni Morrison depicts the many aspects of self-actualization, as well as the tormenting road that leads to the shaping of an individual. Through beautiful language, with immense reality, she is able to describe young black mans journey as he uncovers his personal history, myth, and essence. The story revolves around generations, past and present, of a black family in the south. The character of Milkman (Macon Dead jr.) evolves through the descriptions, events, and experiences of others. His parents, Macon Dead sr., and Ruth Foster Dead, represent the wall-blocking Milkman from his true authentic identity. Many of Milkmans major problems are a direct result of his parents suffocating mistakes. Ruth breast-fed Milkman until he was six years old, hence the name Milkman. She was sexually repressed by her husband for twenty years, and used her young son as a substitute for sexual intimacy. Ruth believed that she possessed no authenticity, and that she was insignificant and isolated. By passing these negative attributes and emotions to Milkman she disturbed his natural process for growth, and ultimately left him feeling lost and insecure. Instead of encouraging Milkman to grow and mature, Ruth hoarded him into the world that she herself despised. We will write a custom essay on Throughout the centuries many authors have attempt specifically for you for only $16.38 $13.9/page Order now Milkmans father, Macon Dead sr., became a ruthless money hound after his father, Jake, was shot and killed for his property. This devastating event from his childhood made him miserly, insensitive, and stingy. Macon Dead sr. becomes a money hungry machine because he does not want to suffer the same fate as his father. Macon Dead sr. fails to tell Milkman the reasons behind his miserly attitude. Thus creating an insurmountable gap between their relationship. Milkmans mother and father both thrust their personal fears on him adding to the destruction of his personal identity. Only after Milkman uncovers these tribulations behind his parents identities, can he begin his quest for self-authenticity. By displacing the profound effect Milkmans parents have on his quest for self-actualization, Morrison is able to convey her theme of generational conflict. Without appropriate parental guidance, honesty, and explanation Milkman has trouble finding the authentic individual within himself. The inner turmoil within both Ruth and Macon Dear sr. reflects negatively upon Milkman, leaving him lost and unfocused. Morrison writes of this hole within Ruth, because the fact is that I am a small woman. I dont mean little; I mean small, and Im small because I was pressed small. (p. 124) Instead of accepting the problems with their own authenticity, both parents force their unauthentic values on Milkman. The overbearing needs of both parents result in Milkmans need to find his personal Identity in other places, other people. The individual who first inspires Milkman to discover his own identity is Pilate, the forbidden sister of Macon Dead sr. She is a mysterious woman, large, masculine, and frightening. Her brother abandoned her after years of support because she began making wine. Macon Dead sr. this drunken profession, and subsequently forbid Milkman to encounter her. Despite his fathers wishes Milkman is intrigued by Pilate and quickly becomes absorbed in her magical, spiritual, fulfilling world. This was the same world that once held his father in awe. Morrison writes, surrendering to the sound, Macon moved closer. He wanted no conversation, no whiteness, only to listen and perhaps to see the three of them, the source of that music that made him think of fields and of wild turkey and calico. (P.29) By entering into Pilates home Milkman begins to question why his father acts the way he does. Through Pilate, Milkman discovers a past that seems lost within his father. This realization begi!ns Milkmans quest for self-authenticity. .u5f67f893686059478bc0eb6380866b67 , .u5f67f893686059478bc0eb6380866b67 .postImageUrl , .u5f67f893686059478bc0eb6380866b67 .centered-text-area { min-height: 80px; position: relative; } .u5f67f893686059478bc0eb6380866b67 , .u5f67f893686059478bc0eb6380866b67:hover , .u5f67f893686059478bc0eb6380866b67:visited , .u5f67f893686059478bc0eb6380866b67:active { border:0!important; } .u5f67f893686059478bc0eb6380866b67 .clearfix:after { content: ""; display: table; clear: both; } .u5f67f893686059478bc0eb6380866b67 { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .u5f67f893686059478bc0eb6380866b67:active , .u5f67f893686059478bc0eb6380866b67:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .u5f67f893686059478bc0eb6380866b67 .centered-text-area { width: 100%; position: relative ; } .u5f67f893686059478bc0eb6380866b67 .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u5f67f893686059478bc0eb6380866b67 .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u5f67f893686059478bc0eb6380866b67 .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u5f67f893686059478bc0eb6380866b67:hover .ctaButton { background-color: #34495E!important; } .u5f67f893686059478bc0eb6380866b67 .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .u5f67f893686059478bc0eb6380866b67 .u5f67f893686059478bc0eb6380866b67-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u5f67f893686059478bc0eb6380866b67:after { content: ""; display: block; clear: both; } READ: Mozart Persuasive EssayMilkmans flight to identity takes him many places. He is fortunate to have a friend, Guitar, who is also lost, and hunting for his authentic identity. The two pursue adventures and their contrasting personalities leave them wit ha wide perspective on events and experiences. While Milkman seems quiet, poetic, almost stumbling on his authentic self. Guitar is eager, outgoing, and aware of his needs. Morrison creates Pilate as a metaphor for a pilot, guiding Milkman through his quest. The fact that

Essay on Yolo or Carpe Diem

Essay on Yolo or Carpe Diem â€Å"Yolo† is a popular acronym used these days as a take on â€Å"Carpe Diem,† or seize the day. It stands for â€Å"You Only Live Once.† It has implications of it being okay to make stupid mistakes because each and every one of us lives once, we think. Life is short, we all know that, and we – well, most of us – want to live life to the utmost fullest, in turn getting everything we can out of life. After all, it is a wonderful, beautiful gift: Life. But we didn’t ask for it. As a matter of fact, it takes some people a lifetime to figure what it means to be alive. â€Å"Yolo† may be a term used by the youngsters of today, as heard in songs by Adam Levine and Drake, but it carries meanings and implications that are universal and everlasting. The phrase is too often used by the hipsters of today in the United States to make excuses for their dumb mistakes. The phrase will never catch on and be used ubiquitously by the American people – or other nationalities, either – because it is cumbersome to say and even harder to care about and remember. To the ordinary person, it sounds like some frozen yogurt brand nobody wants to try, or some variation of the color yellow. But the acronym has good intentions. â€Å"You Only Live Once† reminds one of a hopeful youth, of seeing and wanting the best in life, of seizing the day because tomorrow is not promised – nor is even the next moment. Nonetheless, the wrong people seem to be using the term. They are the slackers who don’t take blame for their impulsive, risky decisions, and then when the problems arise from the decisions, they blame it on â€Å"You Only Live Once.† But it’s just one more way to enable these kinds of behaviors where judgment is lacked. Also, the mentality attached to this word provides people more reasons not to blame themselves for when they make a monumental mistake. They blame it on â€Å"Life† and not their own erroneous decision. What does this create? A bunch of cultures which don’t hold themselves accountable for their actions. SAMPLE ESSAY ABOUT HAPPINESS So this â€Å"Yolo† mentality is not so cut and dry. It is good and bad. It is both a hindrance and an empowering philosophy, depending on the person using it and how they use it. But it is being used nonetheless. Most people want to get all they can out of life, and so, in this case, it is quite motivating. â€Å"Yolo† can be inspirational to those trying new things – who want to take calculated risks, meet new people, take exciting trips, etc. It can mean understanding what it means to be born to die – and in between, there are opportunities to make the most out of this crazy life. In between birth and death, there is of course suffering, problems, the death of others, bad people and bad experiences – but there is also love and hope and family and beauty. Unfortunately, this â€Å"Yolo† philosophy does not seem to focus on the most optimistic aspects of life. It seems more that this philosophy only provides excuses for young rich kids to account for their immature, impulsive, selfish actions. The phrase will never be used by the masses like â€Å"Carpe Diem.† It is one more excuse for spoiled American kids to put off growing up and becoming responsible, productive adults. It is really quite a pathetic, irritating notion to people who don’t have the luxury of staying children their entire lives, putting off adulthood because it doesn’t suit them. â€Å"Yolo† is an irritating acronym, one that is not only confusing to most people but one that will just never catch on. Only the young hipsters will use it, and they are not â€Å"mainstream† anyway.

IT - Forensic Technology Essay Example | Topics and Well Written Essays - 1750 words

IT - Forensic Technology - Essay Example Generally, each crime scene brings its own unique set of questions requiring answers to unveil the truth as the circumstances of each investigation differ considerably. The questions may include but not limited to the way crime was conducted, identities of victims, timeframe of crime and presence of any other material that may assist investigations (Oxenham, 2008). Ian (2010) is of the view that even these techniques are mainly borrowed from other sciences, forensic science has itself developed and matured over the years. Numerous scientific techniques have been developed and refined to support preservation, analysis and interpretation of evidence for forensic purposes. Forensic science cannot be isolated since advancements in other fields of science have been integrated to forensic technology over the years. 2. History of Forensic Science Forensic scientists employ scientific methods and techniques to obtain the evidence from dandruff to DNA and from ammunition to infrared spectroph otometry (Tilstone, Savage & Clark, 2006). Ancient world lacked sophisticated and standardized methods in forensics to analyze and interpret the evidence, but still many accounts in the forensic analysis have been found in ancient history like Archimedes’ analysis for volume of crown in water. In 16th century, European medical practitioners tried analyze cause of death. Similarly, Swedish scientists developed methods for detection of arsenic in 17th century. Juan Vucetich in Argentina solved first criminal case on forensic basis by analyzing the bloody finger prints on a door. First school of forensic was established in 1909 by Rodolphe Archibald Reiss at University of Lausanne. The inquisitiveness to answer questions that have gripped the entire human history including the criminal justice system on scientific basis is over a century old. The courts made opinions of experts admissible inform of fingerprints in and postmortem where these were earlier left to discretion of jur y. With the tremendous advancements in science and technology, different specialized fields and areas of expertise emerged. The witness and evidence supported on scientific analysis has now become a routine in helping jury to find guilty. United States became the main center for development of forensic science from 1930 to 1980. According to Bell, Fisher and Shaler (2008), still at start of twentieth-first century, US holds majors advancements in the field when investigators and scientists are using methods and techniques not thought of a generation before. 3. Classification of Forensics For investigative purposes, forensic science can be viewed as a combination of distinct areas including (Purdue university forensic science, 2012): Forensic Anthropology. Application of physical anthropology in legal scenario. Cyber Forensic. Use and analysis of digital data that is admissible in court of law. Forensic Engineering. Investigation into material and structure of components that fail pr ior to completion of expected duration resulting in accidents. Forensic Entomology. It involves use of insects and anthropodology to study the decomposed materials and bodies to help in investigations. Foensic Odontology. It is the study to human teeth to establish information

With reference to the Arab Spring, assess the utility of the Essay

With reference to the Arab Spring, assess the utility of the Foucauldian notion of resistance, as opposed to the Critical Theory concept of emancipation - Essay Example ies which were affected, the protestors used common ways of civil resistance such as demonstrations, strikes, peaceful rallies and marches as well as the use of social media platforms to mobilize, raise awareness, organize and enhance coordination between the protestors. Most of the demonstrations were often met with violent repression from the regimes which they sought to challenge. For example in places like Libya, the Gaddafi regime used counter demonstration attacks in its attempt to crush the popular revolt. In an attempt to understand the causes of the recent Arab spring across most Middle Eastern countries, many researchers have increasingly adopted both the use of the concept of emancipation as well as the Foucauldian notion of resistance. According to Leonard (1990, p. 126), critical theory is defined as a critique to the social injustices which result from capitalism, misappropriation of public resources and the commoditification of our contemporary society. Critical theories attempt to explain the present social conditions, how such conditions have transformed as well as how they maintain their validity in the changing society. On the other hand, Foucauldian notion of resistance suggests that resistance such as the events witnessed during the Arab spring are largely a reaction to the domination and pervasive power. According to Foucault, there can be no power without resistance. This paper critically analyzes the critical theories with particular focus on the use of Foucauldian notion of resistance as opposed to the concept of emancipation in the critical theory. The two concepts of resistance and emancipation are closely related in that they both attempt to explain the attempts by individuals and societies to minimize domination, achieve equality as well as the efforts to achieve more political and social rights. There are however a number of differences between Foucauldian notion of resistance and the concept of emancipation. As opposed to

Master of Science in Information Management Personal Statement

Master of Science in Information Management - Personal Statement Example I had an attitude of first solving my issues before I sought for help. This attitude, seemingly, has made me have a passion in providing solutions in the ever advancing technological world. In class, I have done well in information technology with the general point average (gpa) of 3, 3. I have also done well in the IT lab and was named the best student in our class. In today’s living, all realms of life require information and technology. In the medical sector, robots are assuming the precise role of surgery. Data storage would be hectic if people were dependent on print media. Transfer of information has become lightning fast and the world has become a global village. With this in mind, and all other myriad of solutions that can be offered by technology, an advancement of knowledge in this field is imperative. The results are a good gauge of what I am capable of doing, given the chance to expand to a master’s level. I have excellent leadership skills that enhance my relationship with other students at Syracuse University, and that I have developed and learned from the university. As a leader, I hope to reconcile the interests of the student with those of the university. I will also use the learned skills in information technology in giving back to the community. Currently, I engage in activities where I teach the community members and those around me on the importance of protecting their personal information and ways through which they can do this. As a group, we talk to the small and upcoming businesses that are embracing the use of information and computer technology in their business operations. With new data gathering tools being invented and the computing power increasing in leaps and bounds, companies and governments need new policies and strategic plans on how to utilize the large amounts of data that is being captured. In order to stay competitive in this world where

A Budget Airline In Hong Kong

A Budget Airline In Hong Kong Budget airlines have become a trend in aviation industry over a few decades all over the world, however, as a Asian cosmopolitan city- Hong Kong hasnt have one yet, therefore a research need to be set up to explore on its feasibility. This project proposal aims to assist to accomplish a research by developing a plan beforehand. Firstly, the background of budget airlines and problem statement would be stated out, then a literature review would be carried out in order to find out its research value, after that, the research aim and objectives could be set up as a research goal, last but not least, research method and project plan could be discussed on how, where and when to carry out this research. 2. Background/ problem statement: Before Deregulation: In the United State before 1978, all airline passenger services were regulated and controlled by the Civil Aeronautics Board (CAB). Only 10 trunk airlines were authorized to issue a grandfather certificate by CAB at that time. Underneath this certificate, all major scheduled airlines route structures and fares were controlled and ruled. For an airlines route structure, stops and intermediate stops were specified and passengers carrying between stops were limited, a new promoted route needed to go through a lengthy procedure and hearings, even a stoppage of a route service was still needed the CABs approval. For an airlines fare, all fare prices were strictly controlled by the CAB. (John Clinton, 1984) After Deregulation: After passing the Airline Deregulation Act of 1978, CAB no longer had an absolute authority on an airlines entry, exit, routes and fares. Airlines were given freedom on setting up their own fares within a wide range, route applicant would be submitted and passed easily without any restriction when it performed air transportation properly. (John Clinton, 1984) First Successful budget airline: In 1967, the first successful budget airline was born and started its business in Texas in America, it named itself as Southwest Airlines (SWA). The company began when the US market was deregulated. Its successful model had been influencing a lot of other following budget airlines. It provides low-cost, high rate of short haul flying and this made itself maintain a most profitable airline through years. (Peter, David, Gillen, Otto and Hans, 2005) What is Budget Airline? A low-cost carrier or low-cost airline (also known as a no-frills, discount or budget carrier or airline) is an airline that generally has lower fares and fewer comforts. To make up for revenue lost in decreased ticket prices, the airline may charge for extras like food, priority boarding, seat allocating, and baggage etc. Todays budget airline: Nowadays, the value for money is a great emphasis placed by travelers. They are willing to buy cheaper tickets to trade off some other aspect such as leg room during flight. However, to determine whether a budget airline can survive and drive down the cost, it mainly depends on government and major airports will to open up the skies. Therefore, different areas are in different cases, but every consumer loves a low price ticket and somehow the developments are very similar in nature and continue in varied ways. As in US, budget airlines have dominated the market as travelers are price driven; in Europe, more local airports are needed to be opened up to let more budget airlines to fly in; in Asia, there are more opportunities to expand the whole market but the path is not easy, since the market is still dominated by the national flag carriers. Besides, they are also supported by the cargo business. (Scott Lee, 2004) Problems Statement: As we can see, budget airlines business not only become a trend over the globe, but also bring out more travelers and so to extend the economy of our own country or region, however, there is no budget airline at all currently in Hong Kong, what are the reasons? Few years ago there was once a low cost carrier- Hong Kong Oasis airway which offered long haul low fare was bankrupted after 18 months of operation, why would that happen? An Malaysian budget airline- Air Asia already developed its third home base in Thailand, meanwhile, there still arent any budget airlines setting up in Hong Kong as a home base, why? What are the success factors for a budget airline to develop? Is there feasibility for a budget airline to set up and form a home base in Hong Kong? 3. Literature Review: 3.1.Business strategy of Budget Airline: Markus (2005) once said The business strategy of these low cost airlines to save costs is to offer no frills, have fast turn-rounds, use only a single-type fleet of planes, and to fly mainly to cheap secondary airportsà ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦Ãƒ ¢Ã¢â€š ¬Ã‚ ¦..They also save a huge amount of administration costs by only accepting credit card payments and thus reducing the paperwork to a minimum (Markus, p.269, 2005) In other word, they minimize their cost in management, aircraft maintenance, crew training, landing fee, parking fee, administration work, etc. Any additional cost, they will stay in the air ticket and let the passenger pay for it. This would rise out a question, would the passengers in Hong Kong be willing to pay for a low cost just to get to a destination or a high price to buy a good quality of service? Budget airline is a trend? Start from the next two years as announcing in late May, the Singapore airline would establish a subsidiary-a no frill, low cost airline, using wide body aircrafts to serve medium to long haul routes. According to the company after years of markets of extensive review and analysis, they have to admit that there is a large growing demand for low fare travel. The low fare airlines assist to stimulate the growing demand of travel. The company wants to launch this service to push its single-digit growth to a double-digit growth as this low fare market is growing hugely. (Govindasamy, 2011) This has showed us which the low fare air travel market is growing and even an Asian state-owned conventional airline want to join in to gain share, therefore there is lots of room for more new budget airlines to be set up and serve the demand. Budget airline comparing with conventional airline over the globe: Graham Dunn (2011) state in the airline magazine, Data from four years of the Airline Business low-cost carrier and world airline ranking surveys shows that while the 10 largest network carriers were highly profitable in 2006 and 2007, seven lost money in 2008 and eight were in the red in 2009 at an operating level. Contrast this with the top 10 lost-cost carriers- only two lost money in 2009, three in 2008 and one apieve in 2007 and 2006. In this case as we know, during the economic crisis between 2008 and 2009, we can see that the low cost carrier is on a steady growth and earn money, but the conventional airlines are greatly affected. In fact, the magazine also shows that the budget airlines are growing at a double-digit development around the USA and Europe, and there are still more room for them to rise. In South East Asia, the larger low-cost carriers already expand beneath their home market and set up more home base in other country around the region as there has been a great demand for cheap air travel, such as Airasia has also set up a home base in Indonesia and Thailand beyond Malaysia. (Graham Dunn ,2011) Therefore, even Hong Kong set up a budget airline, there are still lots of other competitors around the region, and can it survive? The Background and Success of Air Asia and the Asia region: Apparently in the 21st century, if the more preferable demography and economic trend persist, Asia would be well focused by the whole world, in other words, more people would be willing to travel in and out of Asia by plane for business and leisure. (Joseph, 2011) Air Asia now is one of the largest low cost carriers in South East Asia. It used to be built up by the Malaysia government from 1993 and started its own operation as a flag conventional airline in 1996, however, within those five years, it was a cracked airline which only have two Boeing 747, 250 staffs, four destination and a debt of $11 million. But in 2001, it was bought by Tune air and turned it and re-launched as a low cost carrier, then it start to become a profitable business. In 2007, Air Asia X was set and launched as a low cost long haul carrier which flies to Europe and Australia. Currently, the whole Air Asia Group has owned 102 aircrafts, flies 150 routes and 68 destinations, it has been still continuing to expand its fleet and market share. In the past two year, it has already accomplished a Double-digit capacity growth. Certainly, there are some advantages that it already fully take, such as low-price labor, a helpful economical hub at Kuala Lumpur. (Joseph, 2011) In this case, are there any success factors we can learn from and use in Hong Kong? The Background and failure of Oasis Hong Kong airway: Oasis Hong Kong airline claimed to be the first long haul low cost airline based in Hong Kong, Reverend Raymond Lee led a starting capital of $100 million with several Hong Kong investors. It began its operation and launch to serve passengers from October 2006, but after 18 months of operation, it halted all operation and collapsed as financial liquidation. It used to own 4 Boeing 747 and flew two routes, and three destinations: Hong Kong, Vancouver and London. During the operation period of time, the price of jet fuel has jumped from $600 a tonne when Oasis started flying to a current level of around $1,137 a tonne. Besides, the company did not run as an short haul, no service model but provide a full service such as inflight meal and entertainment. (Robin, 2008) In this case, a rise of jet fuel price can push a company to fall, are there any other critical threats which exist? Or the whole Hong Kong aviation environment is not suitable for an budget airline to exist? Disadvantages and advantages of budget airlines: For traveling with budget airline, there are also some disadvantages that you may want to take account for, such as you may only have a limited meal with probably peanuts at all for the whole flight, you may not choose your own seat, they have less flexibility which you cant cancel your flight or get a refund, any extra checked bags will be charged, they often land on remote airports with no bus connection and they are usually booked through internet. (Shewanda, 2011) However, there are also some advantages you may want to consider, such as the fare with budget airline is relatively small which you can save the money for other things, they often fly to more locations and smaller cities that you may interest, and as money are saved, thus more travels will be encouraged and more people can afford it. (Jennifer, 2011) Therefore, when the Hong Kong customers compare the advantages and disadvantages of budget airlines, will they still choose budget airline? What is the low fare travel market like in Hong Kong? Challenges and Background of the local dominant airline in Hong Kong: The company began in 1946. It was found by two world-war 2 pilots. They first flew to carry passenger to Manila, Bangkok, Singapore and Shanghai. However in 1948, some of the shares was bought by a UK company, Butterfield Swire (today known as the Swire Group) which took a 45% share. Therefore John Kidston Swire took the leadership work; Butterfield Swire became wholly responsible for the management of the airline. And then it has been expanding through time. In 1998, the Cathay City was built, and in 2006, the dragon air was bought to be involved in Cathay Pacific Group. Right now it owns 128 aircrafts and has ordered more than 100 aircrafts. Its route has covered more than 150 destinations in 41 countries. It ranks as the worlds 2nd most profitable airline by net profit and the 7th largest airline in the world by operating profit. Its staffs number is 19,850 worldwide. (From Cathay Pacifics Website) In this case, its customers do not only include leisure and business travelers but also the regional people. If a budget airline was being set up, this airline would be the biggest local competitor. Potential low cost carrier that will be set in Hong Kong: There will be two potential budget airlines setting up in Hong Kong- the Hong Kong express and the Jetstar subsidiary. The Hong Kong Express will transform to a low cost carrier in Jul-2012 or Aug-2012, operating under its new low-cost model to cities in mainland China, South Korea, Japan and Southeast Asia. As a Foreign budget airline- Jetstar is also looking forward to establishing a subsidiary in Hong Kong, it may try to co-operate with Hong Kong Airline. (CAPA, 2011) This case has showed us that many companies are interested in developing a low cost carrier in Hong Kong, therefore in other words, there is feasibility for Hong Kong to set up an low cost carrier. 4. Aim: Through analyzing all the data collected to determine whether it is possible to set up an budget airline in Hong Kong or not. 5. Objectives: To explore the background information and business model of budget airline To explore the operation, cost structure, strategy of low cost carrier in Asia To carry out a case study: the success story of Airasia and the failure story of Oasis To set up a survey to ask about Hong Kong frequent flyers expectations on budget airlines services To calculate all operating cost and expense to run this business To compare the price of flying with an existing conventional airline with a hypothetical budget airline to find out the feasibility 6. Research method: For this research, I will use the inductive method approach, because my aim is explore the feasibility to set up an successful budget airline which could last for a long time in Hong Kong through observing variety of data such as budget airline business model, cost structure, government policy and so to analyze and find out the answers for it. And I will select the survey strategy for gaining Hong Kong peoples opinion of service they wish to add in without any additional cost for a budget airline service in order to calculate the operating cost of an hypothetical budget airline and so to set up the best price of a fare to equalize the cost. Then I will pick the memo-method as my unique data collection method, and carry out the cross-sectional study as the data would give me the result. For data collection, I will use questionnaire and the interview. 6.1 Questionnaire For the Questionnaire, I plan to interview 50 people, they are mostly business travelers and leisure travelers, I will approach them through my friends who are frequent flyers. 6.2 Interview: For individual interview, I hope that I can make an appointment with some of the staffs who work as an airline accountant and inside the airport authority, and gain financial information of running an airline company. 7. Project Plan: I would like to spend half a year to complete my project. Here is my work breakdown structure:

Aspirin Overdose Essay -- essays research papers

  Ã‚  Ã‚  Ã‚  Ã‚  Aspirin is one of the most commonly used drugs in history. Aspirin is used for many different reasons. People use Aspirin for its cardiovascular blood thinning properties, for its pain relieving properties and for it antipyretic properties, to name a few. Most people don’t know what Aspirin is, but only what it does for their particular needs. I will attempt to describe some different aspects of Aspirin and Aspirin overdose. I will give a brief description of what Aspirin is, chemically speaking and where aspirin originates from. The use of Aspirin for attempted suicide is common as a primary drug or as a co-drug. I will explain the possible signs and symptoms an overdose patient will experience, and the assessment, and the prehospital treatment for the patient.   Ã‚  Ã‚  Ã‚  Ã‚   Aspirin is derived from a chemical extracted from willow bark: Salicylate Acid. Salicylate Acid has a long history of uses. During Medieval times herbalists used it for its palliative properties. In the mid 1900’s, chemists isolated the active ingredient of willow bark, salicylic acid, and Aspirin was developed. It quickly became the drug of choice as a pain reliever, antipyretic and anti-inflammatory. The first company to develop Aspirin for commercial use was the Bayer Company. Today Aspirin is used daily by millions of Americans to help reduce the risk a heart attack. Until the late 1900’s, with the development of Aspirin alternatives such as acetaminophen and ibuprofen, Aspirin was the most widely used drug around, and a common drug of choice for the overdose patient.  Ã‚  Ã‚  Ã‚  Ã‚     Ã‚  Ã‚  Ã‚  Ã‚   Aspirin has many affects on the body when taken in excess amounts. One common affect is hyperventilation, which causes the patients PCO2 to drop from normal limits. The body will attempt to compensate for this by excreting bicarbonate, which results in an increase in pH blood levels. If this is not corrected, it will lead to metabolic alkalosis. Excess amounts of Aspirin will have many affects varying in severity such as severe illness, seizures, shock, and sometimes coma. Some of the more common symptoms include hypotension, tachycardia, tachypnea, nausea and vomiting, decreased level of consciousness, hypoglycemia, and tinnitus.   Ã‚  Ã‚  Ã‚  Ã‚  During the pre-hospital initial assessment of the ... ...nbsp;  Ã‚  Ã‚  In conclusion, Aspirin is a drug that is commonly used in many aspects of home health care. People take Aspirin daily for different reasons, including pain control and cardiovascular therapy. Aspirin overdose is a common finding and is often a co-drug in suicidal attempts. Overdose patients present with varying degrees of symptoms. Some of the more common symptoms include hypotension, tachypnea, nausea and vomiting, hypoglycemia and tinnitus.   Ã‚  Ã‚  Ã‚  Ã‚  When a paramedic encounters a patient who presents with Aspirin overdose, the paramedics primary concern is to stabilize all life threatening conditions, secondly, the paramedic must perform an in-depth patient interview in the attempt to establish how much Aspirin was ingested and how long its been since ingestion. Initial treatment for the patient with Aspirin overdose is the administration of 100% oxygen and continuous monitoring of the patients vitals signs and ECG. If indicated, the paramedic should administer Activated Charcoal to prevent the ongoing absorption of Salicylatic Acid. Finally, transport the patient to the emergency department for physician evaluation and blood analysis.

Evaluation of Waste Tire Devulcanization Technologies

(INTERNAL REPORT) CENTERPLASTICS COMPOUND & ADDITIVES Feb. 2011 – M. S. Laura Fontana – Centerplastics Enterprise, Ltd Eastern Industrial Road, zip. 516127, Shiwan Town, Boluo Area, Huizhou, DongGuan, GuangDong, P. R. China PPH Chapter 1 – Introduction Approximately 25 potential devulcanization technology researchers and developers were identified throughout the world, however, only a very small number of devulcanization systems are now operating. These are primarily small-capacity systems, which are devulcanizing natural or synthetic rubbers (as opposed to devulcanizing the mixture of rubbers recovered from waste tires). The general types of devulcanization technologies identified and analyzed in the study are shown below. Technology Basis of Processing Zone of Reaction Chemical Chemicals/chemical reactions Surface of particles Ultrasonic Ultrasonic waves Throughout particles Microwave Microwaves Throughout particles Biological Microorganisms Surface of particles Other Mechanical Steam Surface of particles Key findings Reliable information and data on devulcanization of waste tire rubber are difficult to obtain due to proprietary claims, efforts to hide poor or infeasible process performance and product quality, and the limited number of technology researchers and developers and of peer-reviewed data. Reliable data relating waste tire characteristics, devulcanized rubber quality, end product performance, and production costs is scarce.  · Only a very small number of low-capacity devulcanization systems are operating in the United States (at approximately 50 Kg /hr, all R&D scale, mechanical, or ultrasonic). No proven commercial capacity units could be found that are currently devulcanizing waste tires, for example, at 500 Kg/hr or greater. The likely reasons include insufficient product quality and high costs of production.  · In terms of the potential of producing high-quality devulcanized rubbers (for example, high strength), the best technology appears to be ultrasonic, based on the current state of the art.  · Devulcanization of single rubbers has much more history than that of multi-rubber mixtures such as waste tires. Only a few companies devulcanize single formulation rubber as a result of captive conversion or merchant scrap recovery from manufacturing. The production of devulcanized rubber from home manufacturing scrap in the U. S represents about 1 to 2 percent of total U. S. rubber consumption.  · The quality of devulcanized single rubbers is higher than that of devulcanized multiple rubbers.  · Devulcanization that depends on surface devulcanization technologies (for example, chemical and mechanical) appears destined in the near term to produce low- or medium-quality devulcanized rubber material. The estimated cost for producing devulcanized materials from waste tires is $0. 3 to $0. 6/Kg  ± 30 percent, if including the cost of crumb rubber feedstock. This range of production costs is significantly greater than that of virgin rubbers. A typical tire compound contains the following constituents: Table 1. Composition of Tires Passenger Tire Constituents Common Materials Natural rubber 14 % Natural rubber Synthetic rubber 27% SBR, butadiene rubber Carbon black 28% Carbon black Steel 14%–15% Steel Fabric, fillers, accelerators, antiozonants, etc. 16%–17% Polyester, nylon, aromatic oil, coumarine resin, silica, bonding agent, stearic acid, ntioxidant, processing chemicals, sulfur, zinc oxide Truck Tire Natural rubber 27% Natural rubber Synthetic rubber 14% Synthetic rubber Carbon black 28% Carbon black Steel 14%–15% Steel Fabric, fillers, accelerators, antiozonants, etc. 16%–17% Polyester, nylon, aromatic oil, stearic acid, antioxidant, wax, processing chemicals, sulfur, zinc oxide Source: Rubber Manufacturers Association, 2004. †¢ Reclaiming is a procedure in which scrap tire rubber or vulcanized rubber waste is converted—using mechanical and thermal energy and chemicals—into a state in which it can be mixed, processed, and vulcanized again. The principle of the process is devulcanization (Franta, 1989). Historically and practically, in the concept of rubber reclaiming, devulcanization consists of the cleavage of intermolecular bonds of the chemical network, such as carbon-sulfur (C-S) and/or sulfur-sulfur (S-S) bonds, with further shortening of the chains also occurring (Rader, 1995). This description of devulcanization is different than that given below, which is limited to chemical interactions involving sulfur atoms. †¢ Reclaim is an interesting raw material as it reduces the production costs of new rubber articles, due to shorter mixing times and lower power consumption. The processing temperature is lower, and the material has a higher dimensional stability during calandering and extrusion due to the remaining three-dimensional network. The most important advantage of cured articles containing reclaim in terms of properties is an improvement of aging resistance. †¢ Devulcanization is the process of cleaving the monosulfidic, disulfidic, and polysulfidic crosslinks (carbon-sulfur or sulfur-sulfur bonds) of vulcanized rubber. Ideally, devulcanized rubber can be revulcanized with or without the use of other compounds. The different types of devulcanization processes also modify other properties of the rubbers. These processes cause diminution of some properties over those of the parent rubber. Ideally, devulcanization would yield a product that could serve as a substitute for virgin rubber, both in terms of properties and in terms of cost of manufacture. Polymers can be divided into two groups: thermoplastics and thermosetting materials. Thermoplastics soften when heated, making it possible to (re-)shape them at higher temperatures. Thermosetting materials, like rubbers, are crosslinked on heating and therefore cannot be softened or remodeled by raising the temperature. Therefore, thermosets are more difficult to recycle compared to thermoplastics. The three-dimensional network has to be broken in order to make the material (re-)processable: the so-called reclaiming process. In this process, either sulfur crosslinks connecting the polymer chains or carbon-carbon bonds in the polymer backbone are broken. The first mechanism is preferred, as the backbone of the polymer remains intact. Scission can be obtained by heat, shear or chemical reactions. Basically, processes of rupturing the rubber network by crosslink or main-chain scission can be classified into five main groups. †¢ Thermal reclaiming; †¢ Thermo-mechanical reclaiming; †¢ Mechano-chemical reclaiming; †¢ Reclaiming by radiation, and †¢ Microbial reclaiming. In actual practice, combinations of thermal and mechanical reclaiming are mostly used, with in some cases the addition of a devulcanization aid for chemical reclaiming. 1. 1-Thermal Reclaiming For this kind of processes, heat (often combined with addition of chemicals) is used to break the sulfur bonds and thus to plasticize the rubber. Hall patented in 1858 one of the oldest and most simple processes in the rubber reclaiming industry, the Heater or Pan process (Oil law). In this process, finely ground natural rubber powder is mixed with oils and reclaiming agents and treated with high or medium pressure steam at temperatures varying from 170 °C to 200 °C. The reclaiming time is long and the homogeneity of the reclaim is low, but this process is able to reclaim a large number of polymers: natural rubber (NR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), acrylonitrile-butadiene rubber (NBR) and butyl rubber (IIR) and the equipment is rather inexpensive. The use of the heater or pan process became less popular after Marks patented the Digester or Alkali process in 1899. The fibers of the rubber scrap, remnants of the tire carcass, were first removed by mixing it with alkali, water, plasticizing oils and, if needed, chemical peptizers. The mixture was heated in a jacketed, agitator equipped autoclave to 180-210 °C. The most important disadvantage of this process is the pollution generated by the chemicals. Modifications of this process minimized the pollution, but increased the reaction times. Processes with short reaction times are for example the High Pressure Steam processes or the Engelke process. In the first process, a fiber-free, coarse ground rubber is mixed with reclaiming agents, and reclaiming is done in a high-pressure autoclave at approximately 280 °C. In the latter process, coarse ground rubber scrap is mixed with plasticizing oils and peptizers and is put into small autoclaves. The material is heated to very high temperatures for a short period of 15 minutes, after which it is lead through refiners (mills with very narrow gaps) and strainers. . 1. 1 – Steam With or Without Chemicals (Digester, DD-CR, HTDD-CR) Steam devulcanization of crumb rubber uses a steam vessel equipped with an agitator for continuous stirring of the crumb rubber while steam is being applied. There are two variants of the basis steam process, namely, â€Å"wet† and â€Å"dry. † The wet process uses caustic and water mixed with the rubber crumb, while the dry proce ss uses only steam. If necessary, various reclaiming oils may be added to the mixture in the reaction vessel. In one case, a wet process using diaryl disulfide and reclaiming oils with saturated steam at 190 °C (374 °F) was fed finely ground NR and synthetic rubber scraps. A charge of about 440 lbs. was partially devulcanized after 15 to 17 hours of processing. This process required 12 hours at ambient temperature for pre-treatment and 3 to 5 hours for steam or high temperature treatment (Adhikari, et al. , 2000). The dry process digester has the advantage of generating less pollution than the wet process. Scrap rubber containing natural and synthetic rubbers can be reclaimed by the steam digestion process. Reclaiming oil used for this process has molecular weights between 200 and 1000, consisting of benzene, alkyl benzene, and alkylate indanes. A generic processing diagram for steam devulcanization is shown in Figure A. Figure A. Schematic Diagram of a Steam Devulcanization System Devulcanized Rubber Dehydrating System Steam Reactor Rubber Crumb Chemical(s) Liquid By-Product 1. 2 – Thermo-Mechanical Reclaiming The thermo-mechanical reclaiming processes make use of shearing forces to plasticize the rubber. Energy is introduced into the materials, resulting in a significant temperature increase, high enough to cause thermal degradation. The Lancaster-Banbury process is one of the oldest processes. Fiber-free coarse ground rubber scrap is mixed with reclaiming agents and sheared in a high speed, high-pressure internal mixer. When a continuously working, multiscrew devulcanizer is used instead of the internal mixer, the process is called the Ficker reclaiming process. One of the first continuous reclaiming processes is the so-called reclaimator process. This is basically a single screw extruder that has been adapted to reclaim fibre-free rubber scrap in very short extrusion times. The short extrusion times make this method suitable for SBR, that tends to harden when longer recycling times are applied. Another mechanical reclaiming process is the De-Link process. In this process finely ground rubber powder is mixed with the De-Link masterbatch (DeVulc) : a zinc salt of dimethyldithiocarbamate and mercaptobenzothiazole in a molar ratio of 1:1 to 1:12, dispersed in thiols and activated by stearic acid, zinc oxide and sulfur. Advantages of the process are its simplicity and the fact that standard rubber equipment is used. No evidence is available to demonstrate that the De-Link process is used beyond laboratory or pilot scale. The Toyota process is another development of mechanical reclaiming. In this process a mixture of ground rubber, virgin rubber, oils and a devulcanization aid is masticated on a two-roll mill or in an extruder. Mechanical devulcanization is achieved through the repeated deformation of rubber particles under specific conditions of temperature and pressure. The result is a devulcanized rubber, ready for further processing. Toyota developed another continuous process, Toyota Gosei (TG) combining pulverization, reclaiming and deodorization. The rubber waste has to be ground to a particle size of 5-10 mm before it can be fed into a â€Å"modular screw-type reactor† with a pulverization zone and a reaction zone. The operating temperature is in the range of 100-300 °C and 100-900 rpm screw speeds are applied, the process requires about 100 Kw (kilowatts) to process 200 to 300 kg (kilograms)/hr of rubber, or approximately 0. 4 kW/kg. By manipulating screw configuration and rotational speed, and processing temperature, researchers are able to control the duration of the treatment. In this way they can, to some extent, control the properties of the devulcanizate. The TG process has been primarily, if not exclusively, used to devulcanize specific types of rubber compounds, such as NR and SBR. 1. 3 – Mechano-Chemical Reclaiming Mixing of the rubber powder with a peptizer (chemicals used to reduce the viscosity of NR) and a reclaiming agent prior to the mechanical breakdown of the material improves the reclaiming process. The devulcanization aid is supposed to selectively break the sulfur crosslinks in the rubber network. This chemical breakdown is combined with input of thermal and/or mechanical energy, as the rate of this process is sufficiently high only at higher temperatures. The most common devulcanization aids are disulfides, e. g. aryl disulfides or diphenyl sulfides, thiophenols and their zinc salts and mercaptanes. These chemical compounds are radical scavengers: they react with the radicals generated by chain- or crosslink scission and prevent recombination of the molecules. Typical concentrations for the reclaiming agents are 0. 5 to 4 wt%. Suitable peptizers are aromatic and naphthenic oils with a high boiling point. Figure B. Schematic Diagram of a Chemical Devulcanization System Devulcanization Agent Rubber Crumb Mixer Heated Extruder Devulcanized Filter Dryer Rubber Liquid By-Product Unfortunately, a detailed accounting of test materials, performance parameters, and conditions is lacking, thus inhibiting the extent of interpretation of the data. Comparisons of data are primarily limited to comparing the properties of virgin rubbers with compounds containing the virgin and devulcanized material at concentrations of about 30 percent devulcanized material. As shown by the data in the table, the properties of the mixtures containing devulcanized material are in general moderately lower than those of their virgin counterparts. The reported data reflect two different types of chemical devulcanization technologies. Table 2. Properties of Waste Tire Rubber Devulcanized Using Chemical or Chemical/Mechanical Technology Generic Technology Technology Surrogate Test Rubber Compound s % Devulc (or Ground) Mat'l Mooney Viscosity (ML-4 @ 212 °F) Tensile Strengt h (lbs/in2) 300% Modulus (lbs/ in2) Elongation to Break (%) Chemical STI-K Polymers DeLinka NR 0 61. 9 4,270 1,987 534 NR w/devulc NR 30 72. 3 4,020 2,151 489 Virgin SBR (1520) 0 96. 6 3,880 3,059 358 SBR (1520) w/devulc SBR 30 109. 2 3,580 2,923 345 Chemical/ Mechanical LandStar/ Guangzhou Research Instituteb NR 100 28. 4 680 SR 100 17. 2 514 AMRc Powder (devulc. additive) 100 23. 9 640 Tread Tire Compoundd 0 20. 3 772 28. 6 19. 7 628 Light Duty Truck Tire Compounde 0 23. 8 536 28. 6 20. 5 500 1. 4 – Reclaiming by Irradiation Bond type Dissociation energy (KJ/mol) C-C 349 C-S 302 S-S 273 Polysulfidic 253 Table 3. Typical bond energies 1. 4. 1 – Ultrasonic Rubber devulcanization by using ultrasonic energy was first discussed in Okuda and Hatano (1987). It was a batch process in which a small piece of vulcanized rubber was devulcanized using 50 kHz ultrasonic waves after treatment for 20 minutes. The process apparently could break down C-S and S-S bonds, but not carbon-carbon (C-C) bonds. The properties of the revulcanized rubber were found to be very similar to those of the original vulcanizates. One continuous process for devulcanization of rubbers is based on the use of high-power ultrasound electromagnetic radiation. This is a suitable way to recycle waste tires and waste rubbers. The ultrasonic waves, at certain levels, in the presence of pressure and heat, can quickly break up the three-dimensional network in crosslinked, vulcanized rubber. The process of ultrasonic devulcanization is very fast, simple, efficient, and it is free of solvents and chemicals. The rate of devulcanization is approximately one second. This may lead to the preferential breakage of sulfidic crosslinks in vulcanized rubbers. (Isayev, 1993; Yu. Levin, et al. , 1996; Isayev, et al. , 1997; Yun, et al. , 2001; Yun & Isayev, April 2003). Under a license from the University of Akron for the ultrasonic devulcanization technology, NFM Company of Massillon, Ohio, has built a prototype of the machine for ultrasonic devulcanization of tire and rubber products (Boron, et al. 1996; Boron, et al. , 1999). It was reported that retreaded truck tires containing 15 and 30 weight percent (percent by weight) of ultrasonicallydevulcanized carbon black-filled SBR had passed the preliminary dynamic endurance test (Boron, et al. , 1999). Extensive studies on the ultrasonic devulcanization of rubbers, and some preliminary studies on ultrasonic decrosslinking of crosslin ked plastics, showed that this continuous process allows recycling of various types of rubbers and thermosets (Isayev, 1993; Hong & Isayev, 2002 (pp. 160–168); Shim, et al. 2002; Shim & Isayev, 2003; Gonzalez-de Los Santas, et al. , 1999). As a consequence of the process, ultrasonically-devulcanized rubber becomes soft, therefore enabling this material to be reprocessed, shaped, and revulcanized in very much the same way as virgin rubber. This new technology has been used successfully in the laboratory to devulcanize ground tire rubber (commonly referred to in the industry as GRT) (Isayev, et al. , 1995; Yun, et al. , 2001; Boron, et al. , 1996), unfilled and filled rubbers N (Hong & Isayev, 2001; Yu. Levin, et al. , 1996; Isayev, et al. , 1997; Diao, et al. 1998; Shim, et al. , September 2002; Ghose & Isayev, 2003), guayule rubber (Gonzalez-de Los Santas, et al. , 1999), fluoroelastomer, ethylene vinyl acetate foam, and crosslinked polyethylene (Isayev, 1993; Isayev & Chen, 1994). After revulcanization, rubber samples exhibit good mechanical properties, which in some cases are comparable to or exceeding those of virgin vulcanizates. Structural studies of ultrasonically-treated rubber show that the breakup of chemical crosslinks is accompanied by the partial degradation of the rubber chain; that is, the C-C bonds (Isayev, et al. , 1995; Tukachinsky, et al. 1996; Yu. Levin, et al. , 1997 (pp. 641–649); Yushanov, et al. , 1998). The degree of degradation of C-C bonds can be substantial, depending on conditions. The mechanism of rubber devulcanization under ultrasonic treatment is presently not well understood, unlike the mechanism of the degradation of long-chain polymer in solutions irradiated with ultrasound (Suslick, 1988). Ultrasonic devulcanization also alters the revulcanization kinetics of rubbers. The revulcanization of devulcanized SBR appeared to be essentially different from those of virgin SBR (Yu. Levin, et al. , 1997, pp. 120–1 28). The induction period is shorter or absent for revulcanization of devulcanized SBR. This is also true for other unfilled and carbon black-filled rubbers such as ground rubber tire (GRT), SBR, natural rubber (NR), ethylene propylene diene monomer (EPDM), and butadiene rubber (BR) cured by sulfur-containing curative systems, but not for silicone rubber cured by peroxide. Ultrasonically-devulcanized rubbers consist of sol and gel. The gel portion is typically soft and has significantly lower crosslink density than that of the original vulcanizate. Due to the presence of sol and soft gel, the devulcanized rubber can flow and is subject to shaping. Crosslink density and gel fraction of ultrasonically-devulcanized rubbers were found to correlate by a universal master curve (Yushanov, et al. , 1996; Diao, et al. , 1999; Yushanov, et al. , 1998). This curve is unique for every elastomer due to its unique chemical structure. In a comparative analysis of ultrasonically reclaimed unfilled SBR, NR and EPDM rubbers, it was found that it was more difficult to reclaim EPDM than NR and SBR. Reclaiming of EPDM roofsheeting resulted in a good quality reclaim, which after revulcanization showed more or less equal mechanical properties compared to the virgin compound. The surface smoothness of the revulcanized compounds could be controlled by the process conditions. Most companies marketing ultrasonic devulcanization technologies are utilizing very similar technologies involving cold feed extruders and varying physical arrangements of ultrasonic equipment. Ultrasonic devulcanization technology is actually composed of a â€Å"devulcanization system†Ã¢â‚¬â€ namely, extrusion and ultrasonic processing. Two key differences in some cases are the equipment and materials used to generate the ultrasonic energy required for the process, and the positioning of the transducer(s) relative to the extruder. Two different arrangements of ultrasonic devulcanization systems are shown in Figures C and D. In this type of devulcanization system, size-reduced rubber particles are loaded into a hopper and are subsequently fed into an extruder. The extruder mechanically pushes and pulls the rubber. This mechanical action serves to heat the rubber particles and softens the rubber. As the softened rubber is transported through the extruder cavity, the rubber is exposed to ultrasonic energy. The resulting combination of heat, pressure, and mechanical mastication is sufficient to achieve varying degrees of devulcanization. The time constant of the devulcanization process takes place in seconds. Essentially all of the rubber entering the process is discharged from the extruder in semi-solid product stream. Process losses would be primarily those due to emissions of fine particulates or of gases, if any, generated due to the mechanical and thermal processes occurring during the devulcanization process. After exiting through the extruder die, the rubber is passed through a cooling bath and then dried. Figure C. Schematic Diagram of an Ultrasonic Devulcanization System Showing a Mid- Extruder Location for the Ultrasonic Subsystem Ultrasonic Processing Zone Cooling Bath Devulcanized Rubber Extruder Rubber Crumb Feed Hopper Figure D. Schematic Diagram of an Ultrasonic Devulcanization System Showing the Ultrasonic Subsystem Located at the Discharge End of the Extruder Ultrasonic Processing Zone Cooling Bath Devulcanized Rubber Feed Hopper Extruder Rubber Crumb Table 4. Properties of Waste Tire Rubber Devulcanized Using Ultrasonic Technology Technology Surrogate Test Rubber Compound s % Devulc or (Ground) Mat'l Mooney Viscosity (ML-4 @ 212 °F) Tensile Strength (lbs/in2) 100% Modulus (lbs/ in2) 300% Modulus (lbs/ in2) Elongation to Break (%) U of Akron SBR 1848a 0 2,415 740 780 SBR (1848) w/devulc SBRa 10 1,075 790 540 SBR (1848) w/whole train reclaima (10) 1,940 760 660 SBR (1848) w/30 mesh buffingsa (10) 1,440 780 480 100% NR (SMR CV60) & 0% SBR (23. 5% bound styrene, and Duraden 706)b 0 3,263 116 670 NR (SMR CV60) & 25% SBR (23. 5% bound styrene, and Duraden 706)b 0 1,885 123 600 NR (SMR CV60) w/devulc SBR (23. 5% bound styrene, and Duraden 706)b 25 580 123 380 NR (SMR CV60) & 50% SBR (23. 5% bound styrene, and Duraden 706)b 0 406 131 390 Technology Surrogate Test Rubber Compound s % Devulc or (Ground) Mat'l Mooney Viscosity (ML-4 @ 12 °F) Tensile Strength (lbs/in2) 100% Modulus (lbs/ in2) 300% Modulus (lbs/ in2) Elongation to Break (%) NR (SMR CV60) w/devulc SBR (23. 5% bound styrene, and Duraden 706)b 50 363 123 320 NR (SMR CV60) & 75% SBR (23. 5% bound styrene, and Duraden 706)b 0 363 145 295 NR (SMR CV60) w/devulc SBR (23. 5% bound styrene, and Duraden 706)b 75 276 131 250 100% SBR (23. 5% bound styren e, and Duraden 706)b 0 290 152 200 100% SBR (23. 5% bound styrene, and Duraden 706)b 100 290 138 180 Table 5. Percent Change from Virgin with Selected Devulcanization Rubber Formulations Test Rubber Compounds (grade) Parts or % % Devulc. or (Groun d) Mat'l. Hardnes s Shore Tear Strengt h Tensile Strengt h 100% Modulu s 300% Modulu s Elongatio n to Break Chemical STI-K Polymers DeLinka NR w/devulc NR 30 -5. 9% 8. 3% -8. 4% SBR (1520) w/devulc SBR 30 -7. 7% -4. 4% -3. 6% Kyoto Universityb Truck tire (93 NR+ 7 BR) 84 NR+ 6 BR + 20 devulc 18 8. 1% -2. 3% 2. 6% 0. 0% 74 NR+ 6 BR + 40 devulc 33 12. 9% -11. 9% 28. 2% -17. 4% 65 NR + 5 BR + 60 devulc 46 11. 3% -19. 1% 23. 1% -13. 0% LandStar/Guangzhou R Ic 100 SIR 10 + 50 devulc SIR vs. Case 1 33 4. 3% -23. 7% 6. 7% -6. 7% SIR vs. Case 2 33 6. 5% -23. 0% 11. 5% -8. 6% Tread Tire Compound 0 NR + 30 SR + 20 CIS-BR +40 AMR 28. 6 6. 7% -17. 3% -3. 0% -18. 7% Light Duty Truck Tire Compound 30 NR + 70 SR + 0 CIS-BR + 40 AMR 28. 6 1. 6% -10. 9% -13. 9% -6. 7% Retread Tire Compound c65 NR + 35 SR +40 AMR 28. 6 6. 3% -8. 6% -10. 3% -16. 8% Ultrasonic University of Akrond Versus Akrochem SBR (1848) SBR w/devulc SBR 10 -55. 5% 6. 8% -30. 8% Test Rubber Compounds (grade) Parts o r % % Devulc. or (Groun d) Mat'l. Hardnes s Shore Tear Strengt h Tensile Strengt h 100% Modulu s 300% Modulu s Elongatio n to Break SBR w/whole Tire Reclaim 10 -19. 7% 2. 7% -15. 4% SBR w/30 Mesh Buffings 10 -40. 4% 5. 4% -38. % Natural Rubber and SBR versus devulc Base 100% NR (SMR CV60) & 0% SBR (23. 5% bound styrene, and Firestone Duraden 706) 0 Add 25% SBR, 75% NR 0 -42. 2% 6. 3% -10. 4% Devulc SBR replaces SBR 25% devulc SBR, 75% NR 25 -69. 2% 0. 0% -36. 7% 50% devulc SBR, 50% NR 50 -10. 7% -5. 6% -17. 9% 75% devulc SBR, 25% NR 75 -24. 0% -10. 0% -15. 3% SBR versus devulc SBR 100% devulc SBR 100 0. 0% -9. 5% -10. 0% Heavy carbon-blacked rubber is the hardest to devulcanize, and silica, or other mineral-filled EDPM, is the easiest. Reincorporation of the devulcanized rubber is typically in the 20 to 40 percent range. Devulcanized single-product rubber applications are wide ranging. The reclaimed product may be reintroduced into the same end product or one with more tolerant performance characteristics for the devulcanized rubber. Devulcanized rubber seems to have advantages in bonding, strength, and tread integrity above the properties of crumb rubber, which acts only as a â€Å"rubber†-like filler. According to one developer of a devulcanization process, about 3 to 10 percent of the final product can be blended into virgin material before performance properties are affected. Variations of a few percent are reported by developers of devulcanization when they vary process run conditions. Run-to-run variations are normally acceptable. Devulcanized single rubber products have a much lower degree of degradation than multiple rubber mixtures with devulcanized rubber. Virgin single-grade SBR—or natural rubber replacement with devulcanized material shown by the STI-K and the University of Akron datasets —has, at worst, a reduction of 10 percent in tensile strength, modulus, or elongation. In some cases, the addition of devulcanized rubber causes a major reduction in performance of some properties, along with improvements in one or two properties (hardness and modulus). Because the modulus is the measure of deformation—that is, tension (stretching), compression (crushing), flexing (bending), or torsion (twisting). Similarly, the increase in hardness could be an improvement or detraction, depending on the application. The devulcanized rubber properties displayed are not necessarily optimized for a specific end use. Formulators will likely be able to incorporate devulcanized rubber along with other formulation components to achieve a higher level of final product performance. Key product performance variables are level of contamination, number of rubber types in the rubber mixtures, and additives used by the formulations. The effect of additives was discussed previously under â€Å"Product Characteristics. † The number of types of rubber in waste tires is one of the most important factors affecting quality of devulcanized waste tire rubber. Optimizing a devulcanization process is very difficult when more than one type of rubber is involved. Depending on the process used, process conditions, the material, and the blending level of the devulcanized rubber, most properties will be reduced by a few percent to more than two-thirds of those of the virgin material. In situations where the devulcanized rubber properties are within 10 percent of the original rubber material, blending would seem to be an attractive opportunity that offers the potential of adding a low-cost recycled substitute. The best operating model for devulcanizers of single rubber formulation is a dedicated devulcanization line (or long run) of specific rubber. Smaller volumes of single formulations require incurring extra costs for downtime and lost product caused by the cleanout between runs. The devulcanized rubber itself and some of its additives and fillers—such as carbon black— presumably add value. These fillers take the place of new additives and fillers that would otherwise be necessary. 1. 4. 2 – Microwave Microwave technology has also been proposed to devulcanize waste rubber (Fix, 1980; Novotny, et al. 1978). This process applies the heat very quickly and uniformly on the waste rubber. The method employs the application of a controlled amount of microwave energy to devulcanize a sulfur-vulcanized elastomer— containing polar groups or components—to a state in which it could be compounded and revulcanized into useful products such as hoses. The process requ ires extraordinary or substantial physical properties. On the basis of the relative bond energies of C-C, C-S, and S-S bonds, the scission of the S-S and carbon-sulfur crosslinks appeared to take place. However, the material to be used in the microwave process must be polar enough to accept energy at a rate sufficient to generate the heat necessary for devulcanization. This method is a batch process and requires expensive equipment. Figure E. Schematic Diagram of a Microwave Devulcanization System Rubber Crumb Microwave Unit Devulcanized Rubber Cooling System 1. 5 – Microbial Reclaiming Thiobacillus-bacteria are able to oxidise the sulfur in polysulfonic bonds to sulphate. This reaction is limited to a surface layer of the rubber with a thickness of less than 1 ? and the oxidation takes several weeks. The thiophilic bacteria Sulfolobus Acidocaldarius is able to split carbonsulfur bonds in a stepwise oxidation reaction of the carbon-bound sulfur into a sulfoxide, a sulfone and finally to a sulphate8, 9. The disadvantage of these processes is the low devulcanization rate. Apparently, these types of biological devulcanization processes are exclusively or primarily limited to the surface layers of the elastomers (Christiansson, et al. , 1998). This circumstance may explain the overall low rates of desulfurization based on total mass processed. Figure F. Schematic Diagram of Biological Devulcanization System Microorganisms and Host Media Mixer/ Reactor Rubber Crumb Devulcanized Rubber Dryer Filter By-Product Gases Liquid By-Product Chapter2 – Cost Analysis Given the lack of information in the literature, the cost estimates are based on a synthesis of information and data from multiple sources for a given generic type of technology; The analysis was generally performed by determining the costs (capital and operating and maintenance) of the processes and equipment described in the available literature. The cost analyses were conducted for three technologies that use different processing approaches: chemical, ultrasonic, and mechanical. * The key processing elements of each of these technologies have been previously described in this report, and they serve as the primary basis of estimating capital and operating and maintenance costs. The data in Table 6 summarize the capital costs and operating and maintenance costs for the technologies analyzed. The data for the capital cost analysis include an allowance for engineering services for the construction of the facility. The information shows that the capital costs for the processes vary from about $92,000 to about $166,000. ** Insufficient technical information and data were found during the study to enable reliable cost analyses for other devulcanization technologies. Table 6. Estimated Unit Costs for the Production of Devulcanized Rubber Item Mechanical Chemical Ultrasonic Capacity (lb/hr) 100 75 75 Capital Cost ($) 92,000 166,000 163,000 O Cost ($) 135,000 172,000 136,000 Amortized Capital and O ($) 143,000 186,000 150,000 Amortized Unit Cost ($/lb) 0. 7 1. 2 1. 0 Interest rate: 6% per year; Amortization period: 20 years Similarly, the data in the table indicate that the operating and maintenance costs for facilities of this type range from about $135,000 to $172,000. The operating cost estimates include the cost of crumb rubber feedstock for each of the processes. Based on the relative small size of the facilities, the costs of the rental of a building for processing in operating and maintenance are included. This eliminated the cost of building a structure. As shown in the Table, the estimated amortized costs for producing devulcanized rubber are: $1. 0/lb for the ultrasonic process, $1. 2/lb for the chemical process, and $0. 7/lb for the mechanical process. The analysis used an interest rate of 6 percent per year and an amortization period of 20 years. Due to uncertainties represented by the lack of detailed technical data and operating history for the technologies, the accuracy of the cost estimates is +/- 30 percent. As mentioned earlier, these costs reflect production at low capacities. Some reduction in unit cost would likely occur due to economies of larger scale production. However, estimating reduction in unit cost is difficult because of the lack of data relating to production costs to different levels of throughput capacity for particular devulcanization technologies. For the size of operations considered in this analysis, labor costs are a substantial portion of the production costs. It is very difficult, however, to estimate the magnitude of any potential reductions in unit labor costs that might occur if processing capacities were increased substantially. All circumstances considered, any estimates of commercial production costs for devulcanization of waste tire rubber are highly speculative at best. The best estimate of the study team is that perhaps production costs could be reduced by 25 to 30 percent if processing capacities were increased by a factor of approximately 5 to 10. The estimates of processing costs developed in this study do not include the costs of pollution control. The chapter lists the types of emissions that could be expected. The difficulty of permitting such a process and the cost of compliance with environmental regulations may comprise a significant barrier to the implementation of this technology. Conceivably, pollution control costs could add 10 to 30 percent to the cost of devulcanization. The difficulty of permitting—and the cost—would be a function of the type of devulcanization technology, the processing rates, and other factors. In general, the expectation is that the cost of environmental control systems for chemical devulcanization systems would be greater than that for ultrasonic or mechanical processes. The composition of rubber and additives that are used in rubber compounds in the manufacture of vulcanized rubber can and do have a dramatic effect on the properties of materials manufactured from devulcanized rubber. Apparently, the inferior properties of some poorly (inadequately) devulcanized rubber can be compensated for by the addition of chemicals and the adjustment of operating conditions, among other remedies. In many cases in the literature, this situation is not addressed or discussed. Consequently, comparing devulcanization technologies is difficult. From most of the literature descriptions of the processes, what happens to the sulfur and other vulcanization chemicals during the various processes is unclear. Chapter 3 – Environmental Analysis Little information is available in the literature on the environmental effects associated with waste tire devulcanization technologies. The lack of information apparently exists because business developers and researchers have concentrated their efforts primarily on technology improvements and achieving satisfactory properties for devulcanized rubber, an estimation of emission rates and a detailed environmental analysis are therefore not possible. However, using data and information from some other types of tire manufacturing processes (for example, extrusion of rubber) and the characteristics of vehicle tires, a qualitative analysis was performed. The environmental analysis described subsequently is limited to chemical and ultrasonic devulcanization and assumes that control of emissions would be required. 3. 1 – Chemical technology Chemical devulcanization processes are usually batch processes that involve mixing crumb rubber with chemical reactants at a specific temperature and pressure. Once the design reaction time has elapsed, the contents are then rinsed, filtered, and dried to remove any remaining unwanted chemical components. The product can then be bagged or otherwise processed for resale. A block flow diagram of a generic chemical devulcanization process is illustrated in Figure G, showing the raw material feed is crumb rubber. The crumb rubber is mixed with one or more devulcanization agents. Chemical agents identified as devulcanization agents are listed in Table 8. During processing in the batch reactor, vapors are released that must be collected and treated before release to the ambient atmosphere. Typical types of vapors that might be emitted from a batch reactor are listed in Table 9. The chemicals that would be vented from the batch reactor are dependent on the characteristics of the waste tire feedstock and on the chemical agent(s) used in devulcanizing the crumb rubber. For example, if disulfides are used in the process, they could result in formation of hydrogen sulfide (H2S) or methyl or other mercaptans (RSH). If the chemical agent orthodichlorobenzene is used, chlorinated hydrocarbons could potentially be released in the form of air emissions. Methyl iodide is volatile, and if used as a devulcanization agent, it could be vaporized. Since tire manufacturing utilizes zinc oxide and zinc carbonate, chemical devulcanization might also produce airborne metal particulates. Once the batch is fully processed, the reactor is vented. The vent gases are treated prior to release to the atmosphere. The vapors cannot be treated by vapor phase carbon because these chemicals will plate out and blind the carbon, making it ineffective. Instead, the vapor from the batch reactor needs to be thermally oxidized. At the high exit temperatures, typically as high as 2000 °F (1100 °C), the thermal oxidizer vent gases need to be cooled in a quench tower to approximately 300 °F (150 °C). Then, to remove any metals or other particulate, the vent gases are piped to a baghouse. Because of the high thermal oxidizer temperatures, methyl mercaptans (RSH) or hydrogen sulfide (H2S) from the crumb rubber is oxidized to sulfur dioxide (SO2). Therefore, downstream of the baghouse, a scrubber is required to remove sulfur dioxide (SO2), as shown in Figure G. Scrubbed vent gases are then released to the atmosphere. In addition to the scrubber vent gases described above, liquid waste is generated from the scrubber. This liquid stream contains sodium sulfate (Na2SO4). This liquid waste can be disposed in receiving waters such as a river, stream, or bay. However, discharging to receiving waters will require a significant amount of treatment equipment and eventually a permit. As seen in Figure G, the devulcanized rubber is moved from the batch reactor to a separator by a heated extruder. Liquid that drips off the devulcanized rubber is removed in the separator and eliminated by feeding it to the same thermal oxidizer as the vent gases from the batch reactor. After the liquid has dripped off the devulcanized rubber in the separator, any remaining moisture is removed in the dryer. Fired dryers are typically fueled by natural gas burners. Dryer vent gases are piped to the common thermal oxidizer. Based on the concentration of solids in the scrubber effluent, processing the scrubber effluent through a filter press to dewater the solids may be necessary and cost-effective. Filter-pressed dewatered solids are called â€Å"filter cake. Filter cake might require disposal in a hazardous waste site. Even though the waste disposal site may accept the scrubber effluent water, the economics may favor installation and use of a filter press. This is necessary to dewater the solids due to the high cost of disposal of liquid waste. Figure G. Block Flow Diagram of a Chemical Devulcan ization System Solids H2O Batch Reactor Heated Extruder Separator Crumb Rubber Devulcanization Agent 300 ° F Liquids Devulcanized Rubber Dryer Natural Gas Vapors Thermal Oxidizer Quench Tower Baghouse Natural Gas Scrubber 2000 ° F 300 ° F H2O Air Emissions Air Emissions to Atmosphere Effluent Water Table 7. Tire Raw Materials Polymers Antiozonants Natural Rubber (polyisoprene) 2,2,4-trimethyl-1,2-dihydroquinoline (polymer) Styrene-Butadiene Rubber (SBR) n,n-(1,3-dimethylbutyl)-pphenylenediamine cis-Polybutadiene copolymer paraffinic wax Vulcanizing Agents Antioxidants Sulfur Alkylphenols Tetra-methyl thiurame sulfide Resorcinol Accelerators 2,6-Diterbutylhydroquinone Diphenylguanidine Retarders 2-Mercaptobenzothiazole n-Cyclohexylthiophthalimide n-Cyclohexyl-2-benzothiazolylsulfenamide Plasticizers 2-(n-Morpholinyl)-mercaptobenzothiazole Aliphatic oil Hexamethylenetetramine Aromatic oil Activators Naphthenic oil Zinc oxide Di-(2-ethylhexyl)-phthalate Zinc carbonate Extenders Stearic acid Silica gel Carbon black Table 8. Chemical Agents Used in Chemical Tire Devulcanization Processes Triphenyl phosphine Sodium di-n-butyl phosphite Thiol-amine reagents (specifically propane-thiol/piperidine, dithiothreitol, and hexane-lthiol) Lithium aluminum hydride Phenyl lithium Methyl iodide Hydroxide with quaternary ammonium chloride as a catalyst Orthodichlorobenzene Diphenyldisulphide Diallyl disulfide Toluene, naphtha, benzene, and/or cyclohexane, etc. in the presence of sodium Diamly disulfide Dibenzyl disulfide Diphenyl disulfide Bis(alkoxy aryl) disulfides Butyl mercaptan and thiopenols Xylene thiols Phenol sulfides and disulfides Alkyl phenol sulfides (for SBR) N,N-dialkyl aryl amine sulfides (for SBR in neutral or alkaline solutions) 3. 2 – Ultrasonic technology Devulcanization by ultrasonic methods may be a continuous process (see Figure H). As the figure illustrates, crumb rubber is loaded into a hopper and is subsequently fed into an extruder. The extruder mechanically pushes and pulls the rubber. This mechanical action serves to heat the rubber particles and soften the rubber. As the softened rubber is transported through the extruder cavity, the rubber is exposed to ultrasonic energy. The resulting combination of ultrasonic energy, along with the heat, pressure, and mechanical mastication, is sufficient to achieve varying degrees of devulcanization. The exposure time to the ultrasonic energy is only seconds. Essentially all of the rubber entering the process is discharged from the extruder in a semi-solid product stream. Process losses would be primarily emissions of fine particulate or of gases, if any, resulting from the mechanical and thermal applications occurring during devulcanization. Since the typical operating temperature of an ultrasonic devulcanization reactor is about 230 °F (110 °C), less vapor emission would be expected than from chemical devulcanization. Furthermore, since no chemicals are added to break the sulfur bonds that caused vulcanization to occur, there would likely be lower air emissions. After exiting through the extruder die, the rubber is passed through a cooling bath and then dried. Vented vapors would need to be treated by one of two methods. One method would be to use a small thermal oxidizer. The design of the thermal oxidizer, baghouse, and scrubber would be similar to that described previously for chemical devulcanization. However, the physical size of the oxidizer would be smaller, and the baghouse and scrubber would be larger. A second method to treat the vent gases exiting the ultrasonic devulcanization reactor would be use of vapor phase carbon. In this method, due to the lower operating temperatures of the ultrasonic process, vent gas exiting the ultrasonic zone would have to be heated above the dew point temperature. If this elevation in temperature is not accomplished, the vent gases could condense on the surface of the carbon and thus blind the bed. In other words, adsorption sites on the surface of the carbon would be ineffective, and vent gases would exit the carbon bed untreated. If vapor phase carbon were to be used, the capital cost would be less than that of a thermal oxidizer. However, carbon is not very efficient. Weight loading can be approximately 10 weight percent—in other words, adsorbing ten pounds of vent gas contaminants for every 100 pounds of carbon used. Use of carbon will have a relatively high operating cost. Also, the disposal of spent carbon can be very expensive. This is especially true if the spent carbon requires disposal at a hazardous waste disposal site. Even if the carbon is regenerated on-site, adsorption efficiency decreases after each regeneration. Typically, carbon can only be regenerated ten times. For illustration purposes, Figure H indicates the use of vapor phase carbon. Devulcanized rubber exiting the ultrasonic processing zone has to be cooled. A common method of reducing the rubber temperature is a cooling bath. The volume of cooling water used would be significant. Cooling water may become ontaminated from the process; this effluent water leaving the cooling bath has to be treated. If an air cooler such as fin fans is used in lieu of water in the cooling bath, the volume of effluent liquid would be reduced. Another alternative would be to use a closed-loop cooling system, where the cooling water is cooled and returned to the process for reuse. If there is a buildup of contaminants, a small slipstream could be taken off and treated in a POTW, greatly reducing the amount of effluent that would otherwise require treatment. Figure H. Block Flow Diagram of an Ultrasonic Devulcanization System Ultrasonic Processing Zone Cooling Bath Devulcanized Rubber Feed Hopper Extruder Crumb Rubber Cooling Water Supply Effluent Water Heater Air Emissions Baghouse Carbon Air Emissions to Atmosphere Table 9. Potential Types of Chemical Compounds Emitted by Chemical and Ultrasonic Devulcanization Technologies Compound Probable Source Benzene Plasticizers: Aromatic oil Methylcyclohexane Plasticizers: Na phthemic oil Toluene Plasticizers: Aromatic oil Heptane Plasticizers: Aliphatic oil 4-Vinylcyclohexene Polymers: Natural Rubber (polyisoprene), styrene-butadiene rubber (SBR), cis- Polybutadiene Ethylbenzene Plasticizers: Aromatic oil Octane Plasticizers: Aliphatic oil p-Xylene Plasticizers: Aromatic oil Styrene Polymers: styrene-butadiene rubber (SBR) Nonane Plasticizers: Aliphatic oil 1,4-Cyclohexadiene-1-isopropyl-4- methyl Polymers: Natural Rubber (polyisoprene) Isopropylbenzene Plasticizers: Aromatic oil Cyclohexene-1-methyl-3-(1- methylvinyl) Polymers: Natural Rubber (polyisoprene) Propylbenzene Plasticizers: Aromatic oil Benzaldehyde Polymers: styrene-butadiene rubber (SBR) 1-isopropyl-4-methylcyclohexane (trans) Plasticizers: Naphthemic oil 1-isopropyl-4-methylcyclohexane cis) Plasticizers: Naphthemic oil 1-isopropyl-3-methylcyclohexane Plasticizers: Naphthemic oil Decane Plasticizers: Aliphatic oil Tri-isobutylene Polymers: styrene-butadiene rubber (SBR) & cis-Polybutadiene; Plasticizers: Naphthemic oil Cyclohexene-5-methyl-3-(1- methylvinyl) Polymers: Natural Rubber (polyisoprene) Indane Plasticizers: Naphthemic oil 1-Isopropyl-4-methylbenzene Plasticizers: Aromati c oil Cyclohexene-1-methyl-4-(1- methylvinyl) Polymers: Natural Rubber (polyisoprene) 1-Isopropyl-2-methylbenzene Plasticizers: Aromatic oil Dimethylstyrene Polymers: styrene-butadiene rubber (SBR) Undecane Plasticizers: Aliphatic oil Tetramethylbenzene Plasticizers: Aromatic oil 1,2,3,4-Tetrahydronaphthalene Plasticizers: Naphthemic oil 1,3-Di-isopropyl benzene Plasticizers: Aromatic oil 1,4-Di-isopropyl benzene Plasticizers: Aromatic oil Compound Probable Source 2-Isopropyl-6-methylphenol Antioxidents: Alkylphenols Cyclohexylisothiocyanate Retarders: n-Cyclohexyl-thiophthalimide Cyclododecatriene Polymers: cis-Polybutadiene Dodecane Plasticizers: Aliphatic oil Tridecane Plasticizers: Aliphatic oil Tetraisobutylene Polymers: styrene-butadiene rubber (SBR) & cis-Polybutadiene; Plasticizers: Naphthemic oil -ter-Butylstyrene Polymers: styrene-butadiene rubber (SBR) Dimethylpropylhexahydronaphthale ne Plasticizers: Naphthemic oil Tetradecane Plasticizers: Aliphatic oil Nonylbenzene Plasticizers: Aromatic oil 2,6-Di-ter-butyl-p-quinone Antioxidents: 2,6-Diterbutyl-hydroquinone Pentadecane Plasticizers: Aliphatic oil 1,6-dimethyl-4-isopropyl-1,2,3,4- tetra-hydronaphthalene Plasticiz ers: Naphthemic oil Decylbenzene Plasticizers: Aromatic oil Di-ter-butylthiophene Plasticizers: Aromatic oil Diethyl phthalate Plasticizers: Di-(2-ethylhexyl)-phthalate Hexadecane Plasticizers: Aliphatic oil ,2-Di-tolylethane Polymers: styrene-butadiene rubber (SBR) Heptadecane Plasticizers: Aliphatic oil 2,6-Di-ter-butyl-4-ethylphenol Antioxidents: Alkylphenols Octadecane Plasticizers: Aliphatic oil 1-Phenylnaphthalene Plasticizers: Aromatic oil Di-iso-butyl phthalate Plasticizers: Di-(2-ethylhexyl)-phthalate Tridecylbenzene Plasticizers: Aromatic oil Dibutyl phthalate Plasticizers: Di-(2-ethylhexyl)-phthalate Eicosane Plasticizers: Aliphatic oil Heneicosane Plasticizers: Aliphatic oil Docosane Plasticizers: Aliphatic oil Di-(2-ethylhexyl) phthalate Plasticizers: Di-(2-ethylhexyl)-phthalate Chapter 4 – Conclusions Devulcanization of specific types of rubber and/or waste tire rubber has a long history. However, only recently have limited technical data been reported in the available literature. Usually when reported, the tested properties of devulcanized rubber compose an incomplete list. This is especially true in the interpretation of how the devulcanized product would perform during compounding, in the manufactured end product, or both. Circumstantial and anecdotal evidence indicates significant technical and economic barriers to devulcanization of waste rubber. Based on the information collected in the study, is believed that the only method of achieving bulk devulcanization, as opposed to surface devulcanization, rests with ultrasonic or microwave devulcanization methods. Of these two methods of energy application, ultrasound appears to have substantially more research and development history. An important observation is that microwave technology is not an effective or efficient way to devulcanize non-polar rubber types, which collectively compose the vast majority of the mass of rubber in waste rubbers. Because of the ability to internally devulcanize cured rubber, ultrasonically devulcanized waste tire rubber may have more desirable marketing characteristics than those of surface-devulcanizing processes under similar conditions of cost and yield. The latter processes (surface devulcanizing) include mechanical, chemical, and biological processes. However, test data and applications for ultrasonically devulcanized waste rubber are lacking in the industry, along with process cost documentation. The devulcanized rubber market is most fully developed for single product materials made from manufacturing scrap that are reclaimed for reuse in the same process or in a broader specification application. The reprocessing of single rubbers depends upon being located near a large-volume rubber products company with enough scrap and enough rubber applications to justify the devulcanization step. Devulcanization of waste rubber, despite considerable research and developmental effort, is still in an early growth stage. Devulcanization lacks adequate test data and data interpretation, and it has poorly defined end product specifications without adequately justified and defined applications and uses. Research funds appear to be most available for studying devulcanization of single rubber types, as opposed to studying rubber types with complex mixtur. In applications already using crumb rubber, devulcanized rubber can have advantages if the process combines a vulcanized rubber or other compatible material to create an integrated structure. The structure must have much better properties than those imparted by the filler role that crumb rubber frequently serves.

Prefect essays

Prefect essays I am writing to apply to become a senior prefect, as I believe I would be an ideal representative of the school and a good role model to those younger than me. I recently proved myself to be a good leader in the Careers in Construction challenge, when I took charge of my group, which then went on to win one of the prizes. I would work well with other prefects, as I have always been a keen team worker. I was a regular member of the schools rugby team and I also play in the school wind band as well as the Peterborough County Youth Orchestra. I was part of the John Lewis group in the Industry Challenge Competition as well. John Lewis were so pleased with our performance, they sent a letter to the school to say so. On top of all that, I one of the students taking part in the Engineering Education Scheme. All of these things also show my commitment to extra-curricular activities. I am a hard worker, and proved this by achieving good grades in my GCSE exams, and The school needs to promote the importance of extra-curricular activities, as they can prove to be a valuable asset to those looking to prove themselves as committed workers after leaving school. A good idea would be to give each pupil a compulsory activity, maybe temporarily, that also compliments their schoolwork. A similar idea proved successful in the Industry Challenge Competition. Please consider my application, as I believe I fulfil all the criteria for a good senior prefect. My referee is Mr. Wears. ...

Biography of José Santos Zelaya

Biography of Josà © Santos Zelaya Josà © Santos Zelaya (1853-1919) was a Nicaraguan dictator and president from 1893 to 1909. His record is a mixed one: the country progressed in terms of railroads, communications, commerce, and education, but he was also a tyrant who jailed or assassinated his critics and stirred up rebellions in neighboring nations. By 1909 his enemies had multiplied enough to drive him from office, and he spent the rest of his life in exile in Mexico, Spain, and New York. Early Life Josà © was born into a wealthy family of coffee growers. They were able to send Josà © to the best schools, including some in Paris, which was quite the fashion for young Central Americans of means. Liberals and Conservatives were feuding at the time, and the country was ruled by a series of Conservatives from 1863 to 1893. Josà © joined a Liberal group and soon rose to a position of leadership. Rise to the Presidency The Conservatives had held onto power in Nicaragua for 30 years, but their grip was beginning to loosen. President Roberto Sacasa (in office 1889-1893) saw his party splinter when former President Joaquà ­n Zavala led an internal revolt: the result was three different Conservative presidents at different times in 1893. With the Conservatives in disarray, the Liberals were able to seize power with the assistance of the military. Forty-year-old Josà © Santos Zelaya was the Liberals’ choice for President. Annex of the Mosquito Coast Nicaragua’s Caribbean coast had long been a bone of contention between Nicaragua, Great Britain, the United States and the Miskito Indians who made their home there (and who gave the place its name). Great Britain declared the area a protectorate, hoping eventually to establish a colony there and perhaps construct a canal to the Pacific. Nicaragua has always claimed the area, however, and Zelaya sent forces to occupy and annex it in 1894, naming it the Province of Zelaya. Great Britain decided to let it go, and although the US sent some Marines to occupy the city of Bluefields for a while, they, too, retreated. Corruption Zelaya proved to be a despotic ruler. He drove his Conservative opponents into ruin and even ordered some of them arrested, tortured and killed. He turned his back on his liberal supporters, instead surrounding himself with like-minded crooks. Together, they sold concessions to foreign interests and kept the money, siphoned off of lucrative state monopolies, and increased tolls and taxes. Progress It wasn’t all bad for Nicaragua under Zelaya. He built new schools and improved education by providing books and materials and raising teacher salaries. He was a big believer in transportation and communication, and new railroads were built. Steamers carried goods across the lakes, coffee production boomed, and the country prospered, especially those individuals with connections to President Zelaya. He also built up the national capital at neutral Managua, leading to a decrease in the feuding between traditional powers Leà ³n and Granada. Central American Union Zelaya had a vision of a united Central America- with himself as President, of course. To this end, he started stirring up unrest in neighboring countries. In 1906, he invaded Guatemala, allied with El Salvador and Costa Rica. He supported a rebellion against the government of Honduras, and when that failed, he sent the Nicaraguan army into Honduras. Together with the El Salvadoran Army, they were able to defeat the Hondurans and occupy Tegucigalpa. The Washington Conference of 1907 This prompted Mexico and the United States to call for the Washington Conference of 1907, at which a legal body called the Central American Court was created to solve disputes in Central America. The small countries of the region signed an agreement not to meddle in one another’s affairs. Zelaya signed but did not stop trying to stir up rebellions in neighboring countries. Rebellion By 1909 Zelaya’s enemies had multiplied. The United States considered him an impediment to their interests, and he was despised by Liberals as well as Conservatives in Nicaragua. In October, Liberal General Juan Estrada declared a rebellion. The United States, which had been keeping some warships close to Nicaragua, quickly moved to support it. When two Americans who were among the rebels were captured and killed, the US broke off diplomatic relations and once again sent Marines into Bluefields, ostensibly to protect US investments. Exile and Legacy of Josà © Santos Zelaya Zelaya, no fool, could see the writing on the wall. He left Nicaragua in December of 1909, leaving the treasury empty and the nation in shambles. Nicaragua had much foreign debt, most of it to European nations and Washington sent experienced diplomat Thomas C. Dawson to sort things out. Eventually, the Liberals and Conservatives returned to bickering, and the US occupied Nicaragua in 1912, making it a protectorate in 1916. As for Zelaya, he spent time in exile in Mexico, Spain, and even New York, where he was briefly jailed for his role in the deaths of the two Americans in 1909. He died in 1919. Zelaya left a mixed legacy in his nation. Long after the mess he had left had been cleared up, the good remained: the schools, the transportation, the coffee plantations, etc. Even though most Nicaraguans hated him in 1909, by the late twentieth-century opinion of him had improved enough for his likeness to be featured on Nicaragua’s 20 Cordoba note. His defiance of the United States and Great Britain over the Mosquito Coast in 1894 contributed greatly to his legend, and it is this act which is still remembered most about him today. Memories of his dictatorship have also faded due to subsequent strongmen taking over Nicaragua, such as Anastasio Somoza Garcà ­a. In many ways, he was a precursor to the corrupt men that followed him into the President’s chair, but their malfeasance eventually overshadowed his. Sources: Foster, Lynn V. New York: Checkmark Books, 2007. Herring, Hubert. A History of Latin America From the Beginnings to the Present. New York: Alfred A. Knopf, 1962.

Small Business Enterprise Assignment Example | Topics and Well Written Essays - 3500 words

Small Business Enterprise - Assignment Example such provides basic amenities to the guests mainly in the form of a 7feet by 4 feet room and a TV to stay for the night comfortably at reduced costs. The company wants to expand abroad and build on the path of innovations. However among the major problems that the company is facing one of the problems is the problem of finance. The company is reeling under the problems of debt that is due to the fact that the no. of guests that the hotel entertains is very less. In case of a small enterprise the issue of performance is often overlooked. This is more so in a family owned business like that of Lubic. However, developing the necessary business skills is of paramount importance in managing the performance of a small and medium sized enterprise. This is because in case of the small and medium sized enterprise which are family owned the responsibility to handle the business is means of hereditary succession. However, if the successor is not worthy then the business performance is put to jeopardy. In order to improve performance it is sometimes required to introduce change. In order to restructure the business of the Lubic hotels for examples there are several changes that have to be introduced and if the business has to survive in the long run it has to embrace this changes. In order to see whether the proposed changes are working a review of the performance is taken after the changes have been implemented for a period of time. The small business enterprise that has been selected for discussion is a Japanese hotel named as Lubic small hotel. This hotel is formed to provide comfort accommodation to its customers at an affordable price. Since the concerned hotel is a small enterprise it is operated with the employee strength of only 8 members. Lubic small hotel had to face many obstacles and challenges in carrying out its business in Japan. The weakness that was encountered by the hotel is it faced the problem of inadequate supply of capital to renovate its hotel and