Monday, December 30, 2019

Raw Food Diet Free Essay Example, 1250 words

Naturally, if one decides at once to switch to the raw food diet, i.e. to begin consuming usual products without cooking them, the consequences may be rather lousy. The human organism should be gradually adapted to unprocessed products and the digestive tract should be strengthened and prepared for more intensive work. Gradual adaptation of a stomach to unprocessed and uncooked food is a basis of raw foodism teaching, as only stage-by-stage forbearance from fried and boiled dishes can help one to achieve the goal. According to the proponents of raw food, this way of nutrition is the best possible for a human, because it enables preservation of initial nutrition value of consumed products without loss of any vitamins. Many products are more nutritious when eaten raw, as thermal processing can destroy water-soluble vitamins, many antioxidants, and unsaturated fats, including omega-3s .The origins of the modern raw foodism philosophy lie in nature: nature is seen as a source of inspir ation and knowledge. Raw eaters are inspired by the natural cycles of growth and flourishing, and believe that gifts provided by nature are able to nourish them completely and make their bodies flourish .We will write a custom essay sample on Raw Food Diet or any topic specifically for you Only $17.96 $11.86/page In the ancient times, people used to get food from nature and consume it raw as they didn t know how to cook it then. However, they were rather strong and resistant to diseases and cold. This is taken as a perfect image in raw food diet.

Sunday, December 22, 2019

Essay about Analysis of Financial Statement - 584 Words

To determine Panorama’s financial positions, we need to use ratio analysis. There are four main categories we can use. They are liquidity, activity, profitability, and debt or financial leverage. The first category Panorama needs to look at is liquidity. This is measured in three different ways. Working capital, current ratio and the acid-test ratio. Working capital can be described as a company’s current assets minus its current liabilities. Panorama’s working capital would be $833.89. The second is the current ratio in which we would find by taking a company’s assets divided by its current liabilities. In this case Panorama had current assets of $1808.89 and current liabilities of $975.00. A company’s current ratio is very important in†¦show more content†¦The higher the turnover, the better the company. Profitability measures are used to determine return on investment and the return on equity. Price/Earnings ratio is another way to measure a company’s profitability by dividing the market price of a common share of stock by the earnings per share. The P/E ratio tells us the value of a company’s common stock. Dividend pawet ratio and the dividend yield are some other ways to judge a company’s profitability. Debt, or financial leverage is the last category of ratio analysis used to find the financial condition of a company. Debt, or financial leverage is the last category of ration analysis used to find the financial condition of a company. Leverage adds risk to the operation of a company because a highly leveraged company would be at a greater risk for bankruptcy than a company that was not. Debt and preferred stock provided good leverage for a company because the interest rate is at a fixed rate. There are two financial leverage measures used to tell whether a company is using financial leverage. Debt ratio is the total liabilities to the total of liabilities and owners equity whereas the debt/equity ratio is the ratio of total liabilities to total owner’s equity. Both of these measures are the same concept but just stated in a different manner. In conclusion, from looking at Panorama’s financial statement and usingShow MoreRelatedThe Implications Of Bank Specialization On Its Financial Statement Analysis1097 Words   |  5 PagesWhen making a financial analysis on a bank, the type of business it conducts need to be considered. Specialization can lead a bank to operate in different practices and have a varied structure of their balance sheet. If the structure and composition of the bank is not to be considered, financial statement analysis will provide misleading information. This report will investigate the implications of bank specialization on its financial statement analysis. 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Saturday, December 14, 2019

Behavioral Contract Free Essays

I have always loved to watch movies and television shows but I guess it was an addiction already for the past couple of months. I can say that I am very much hooked in watching the television for the past seven months. I love the thrill, happiness, suspense I feel whenever I watch something on television. We will write a custom essay sample on Behavioral Contract or any similar topic only for you Order Now Whenever I am at home, my whole day would be spent in front of the television. I sometimes skip meals just to watch my favourite movie or a certain talk show. Sometimes I even do not take a bath just to keep track of what I am watching. I love watching those shows that exposes the current fashion, recent social issues, and television magazines, shows that tells Hollywood celebrities’ lives and most of all, movies like suspense thriller, horror, love stories and fairy tales. For me it is the source of my enjoyment, I sometimes forget to study and read books. I think too much watching the television causes great effects in my being. We cannot deny the fact that the youth are great imitators and that is one of our natures. We really follow and imitate what we see and observed from other people especially when we realize that these people involved manifests excitement in doing such acts and we see these people as beautiful and attractive as they could be; we tend to idolize and mimic it. Present television’s advertisements, commercials, shows and movies already content acts and scenes that indicates discrimination if one has an unacceptable look physically and intellectually as perceived by the society, as what is being showcased in the standards of the society; that to be beautiful is to have a white complexion, tall, slender, witty and sexually appealing which have great impact to the minds of the younger generations. These kinds of entertainments will create curiosity and puzzlements to our young minds that will push us to try it by ourselves. This does not concern only the advertisements but also talk shows and movies. They tackle and expose about sex and relationship, love affairs that sometimes we are so caught up with these ideas, which we tend to forget our other responsibilities. I think being bored triggers my addiction to television. I want something to entertain me so that I do not get too alone. Sometimes I get bored just studying and doing other things, but when it comes to television, I really can’t feel ennui at all. I really feel entertain by the television. I should control my being hooked on television and might as well eliminate it. I should discipline myself and have self control. Within 2 weeks I should minimize my television viewing and by the end of month I must have eliminated this behaviour already. If I spend too much of my time in front of the television then I will ask my mother to deduct my allowance by 50%, I will not be able to go on a night out during Fridays, I will not be allowed to wake up late during weekends, lastly I will not be able to go out with my friends during week ends. If I will not comply with the contract then my punishment for myself will be destroy all my shoes and sandals and I will come to school on slippers for one day. While if I will be able to follow all the terms in the contract and comply with it then I my reward will be, spending the whole weekend in my favourite beach resort and hotel. How to cite Behavioral Contract, Papers Behavioral Contract Free Essays I have always loved to watch movies and television shows but I guess it was an addiction already for the past couple of months. I can say that I am very much hooked in watching the television for the past seven months. I love the thrill, happiness, suspense I feel whenever I watch something on television. We will write a custom essay sample on Behavioral Contract or any similar topic only for you Order Now Whenever I am at home, my whole day would be spent in front of the television. I sometimes skip meals just to watch my favourite movie or a certain talk show. Sometimes I even do not take a bath just to keep track of what I am watching. I love watching those shows that exposes the current fashion, recent social issues, and television magazines, shows that tells Hollywood celebrities’ lives and most of all, movies like suspense thriller, horror, love stories and fairy tales. For me it is the source of my enjoyment, I sometimes forget to study and read books. I think too much watching the television causes great effects in my being. We cannot deny the fact that the youth are great imitators and that is one of our natures. We really follow and imitate what we see and observed from other people especially when we realize that these people involved manifests excitement in doing such acts and we see these people as beautiful and attractive as they could be; we tend to idolize and mimic it. Present television’s advertisements, commercials, shows and movies already content acts and scenes that indicates discrimination if one has an unacceptable look physically and intellectually as perceived by the society, as what is being showcased in the standards of the society; that to be beautiful is to have a white complexion, tall, slender, witty and sexually appealing which have great impact to the minds of the younger generations. These kinds of entertainments will create curiosity and puzzlements to our young minds that will push us to try it by ourselves. This does not concern only the advertisements but also talk shows and movies. They tackle and expose about sex and relationship, love affairs that sometimes we are so caught up with these ideas, which we tend to forget our other responsibilities. I think being bored triggers my addiction to television. I want something to entertain me so that I do not get too alone. Sometimes I get bored just studying and doing other things, but when it comes to television, I really can’t feel ennui at all. I really feel entertain by the television. I should control my being hooked on television and might as well eliminate it. I should discipline myself and have self control. Within 2 weeks I should minimize my television viewing and by the end of month I must have eliminated this behaviour already. If I spend too much of my time in front of the television then I will ask my mother to deduct my allowance by 50%, I will not be able to go on a night out during Fridays, I will not be allowed to wake up late during weekends, lastly I will not be able to go out with my friends during week ends. If I will not comply with the contract then my punishment for myself will be destroy all my shoes and sandals and I will come to school on slippers for one day. While if I will be able to follow all the terms in the contract and comply with it then I my reward will be, spending the whole weekend in my favourite beach resort and hotel. How to cite Behavioral Contract, Papers

Friday, December 6, 2019

Beginning Professional Practice for Professional Development

Question: Discuss about theBeginning Professional Practicefor Continuing Professional Development. Answer: The Concept of Continuing Professional Development: The overarching concept continuing professional development is the technique with the help of which an individual employee can gain knowledge and experience based on the performance of an individual. At the very initial period an individual employee cannot gain sufficient knowledge and experience within the workplace. The overall organizational culture, behavioral and psychological approaches of the co-workers are highly important based on which an individual employee get the scope to enhance professional skill and competency (Trewet Fjortoft, 2013). Most of the recognizable business organizations tend to implement CPD as the business strategies to develop the skills of an individual. In developing the professional skill and competency of an individual employee the business experts intend to provide an effective training and development course. Requirements for Professional Development: The Nursing and Midway Board of Australia (NMBA) primarily aims to provide a guideline to the professionals including nursing staffs as well as other members on how they would maintain and develop a professional skill and competency at the workplace. As per the Health Practitioner Regulation National Law it has been observed that nursing staffs while working within the organization have to follow a professional code and conducts (Sabah et al., 2014). As per the guideline of The Nursing and Midway Board of Australia an individual staff has to follow some of the major requirements in order to develop the professional skill and competencies. The necessary requirements include: Nurses and midwives should maintain an effective interaction with the administration about the changing rules and regulations and as well as customer service system As per the CPD plan nurses require to maintain a non-clinical relationship with the clients in order to make them flexible with a new environment Nurses should be accustomed with the changing process of advance technology for providing good services to the employees Professionals should go through a phase of self directed learning in order to make them more efficient as well as confident towards the right path How to use a Portfolio to Evidence CPD: A portfolio can otherwise be considered as a documented record that can maintain a constant database on the current professional skills, experience and the level of competency. While receiving a continuing professional and development training thee professionals need to have that particular portfolio that would help to evaluate the level of competency of that individual. While NMBA aims to appoint an efficient trainer within the business organization the portfolio of every individual professional can be considered as the most effective evidence based on which the market of progress can be identified (McConnell, Delate Newlon, 2012). Portfolio can be considered as the progress report based on which the trainers starts to provide effective training to the employees individually. For evaluating the entire portfolio, it can be observed that an individual nurse needs to develop communication skill for developing the level of competency (Haywood et al., 2012). On the other hand, some of the professional needs a proper training on managing skill as well as decision making skill. In this kind of situation, a proper portfolio helps an individual on how to develop professional and development training course to the nurses. Reference List: Haywood, H., Pain, H., Ryan, S., Adams, J. (2012). Engagement with Continuing Professional Development Development of a Service Model.Journal of allied health,41(2), 83-89. McConnell, K. J., Delate, T., Newlon, C. L. (2012). Impact of continuing professional development versus traditional continuing pharmacy education on learning behaviors.Journal of the American Pharmacists Association,52(6), 742-752. Sabah, S.A., Fayez, M., Alshamrani, S.M. Mansour, N., (2014). Continuing Professional Development (Cpd) Provision For Science Mathematics Teachers In Saudi Arabia: Perceptions Experiences Of Cpd Providers.Journal of baltic science education,13(1). Trewet, C.B. Fjortoft, N., (2013). Evaluation of the impact of a continuing professional development worksheet on sustained learning and implementing change after a continuing pharmacy education activity.Research in Social Administrative Pharmacy,9(2), pp.215-221.

Thursday, November 28, 2019

Anti-Gay Slurs Common at School A lesson in Cruelty by Laura Sessions Stepp Essay Example

Anti-Gay Slurs Common at School A lesson in Cruelty by Laura Sessions Stepp Paper The write-up named â€Å"Anti-gay Slurs Common at School†, written by Laura Sessions Stepp (Reading 34, p.267) offers another perspective on the contentious issue of verbal assaults on gay students. What stands out in the narrative is the fact that verbal slurs pertaining to one’s sexual orientation are being directed at High school students, whom one would expect not to have a concrete idea of their orientation but rather a fluid one. So, the offence in such a scenario is on two grounds – firstly the conception of homosexuality as an inferior basis for interpersonal relationships, and secondly the decadent culture of verbal abuse seen among teenage school goers. The author illustrates the prevailing apathy and indifference among the policy makers and other authorities in school. The case of teenaged boy Justen during his time in Sherman High School and later in Sherman Senior High illustrate how pupil like Justen Deal, who are suspected to be gay, are treated differently by their peers and are subject to abuse of different sorts. In the case of Justen, the lack of support from the school administration is all the more poignant, given the fact that he had briefed his teachers and principal about the hurtful comments directed at him. Even after Justen was assured by the school administration that they would look out for the abusers and take action against them, the abuse continued to flow. To be fair to Sherman Senior High staff, teenage students are very clever in imparting snide remarks and other forms of derogatory comments without getting themselves into trouble. Since the teachers cannot always be at the side of Justen to overhear w hispered comments and insults, it is very difficult to curb peer verbal abuse. We will write a custom essay sample on Anti-Gay Slurs Common at School A lesson in Cruelty by Laura Sessions Stepp specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Anti-Gay Slurs Common at School A lesson in Cruelty by Laura Sessions Stepp specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Anti-Gay Slurs Common at School A lesson in Cruelty by Laura Sessions Stepp specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Laura Stepp, while pointing to the inherent difficulties in disciplining offending students in this regard, does not propose any effective solutions to stop this trend. Nevertheless, the essay is successful in portraying the hurt and pain suffered by homosexual pupils through her plain and lucid style of writing. It seems that a broader awareness of what homosexuality entails as well as legislations and policies toward curbing verbal abuse against the group is the way forward. A successful implementation of awareness programs and policy enforcements will help alleviate the existing inequalities in the social experiences of â€Å"straight† and â€Å"gay† students. There is already some evidence that suggests a more hospitable social atmosphere for homosexuals in the future. For instance, the following passage indicates the kind of impact persistent activism for gay rights can have in the coming years: â€Å"He [Justen] visited West Virginia Gov. Robert Wise’s office asking the governor to convene a task force to investigate harassment. He testified before the legislature on an amendment to the state’s hate crime bill that would have included protection based on sexual orientation. His comments made both Charleston newspapers, including the front page of the Daily Mail.† (Laura Stepp, p.268) Reference: Laura Sessions Stepp, Anti-gay Slurs Common at School – A lesson in Cruelty, Section 2, Reading 34, p.267. The write-up named â€Å"Anti-gay Slurs Common at School†, written by Laura Sessions Stepp (Reading 34, p.267) offers another perspective on the contentious issue of verbal assaults on gay students. What stands out in the narrative is the fact that verbal slurs pertaining to one’s sexual orientation are being directed at High school students, whom one would expect not to have a concrete idea of their orientation but rather a fluid one. So, the offence in such a scenario is on two grounds – firstly the .

Monday, November 25, 2019

The Crusades Essays - First Crusade, Crusades, Second Crusade

The Crusades Essays - First Crusade, Crusades, Second Crusade The Crusades The crusades were military expeditions launched against the Muslims by the Christians in an attempt to regain the Holy Land. They took place between 1095 A.D. and 1270 A.D. It was one of the most violent periods in the history of mankind. The starting point of the crusades was on November 18, 1095 A.D. when Pope Urban II opened the Council of Clermont. On November 27, outside the French city of Clermont-Ferrand, the Pope made an important speech . He called upon everyone to help the Christians in the east to restore peace. The crowd's response was very positive. Garments were cut into crosses which were attached to people's shoulders in an imitation of Christ (Matthew 10:38).(1) The original object of the First Crusade was to help Christian churches in the east. The new goal became to free the Holy Land from Muslim control, especially Jerusalem. Pope Urban II stayed in France until September 1096 to provide leadership and guidance for the members of the First Crusade. He urged churchmen to preach the cross in France. Urban wanted the crusading army to be mostly made up of knights and other military personnel. Since the news of his speech at Clermont spread through the west, people from all social classes and occupations joined the Crusade. As a result of Urban losing control of personnel, violence was launched against the Jews of northern France. This violence was mostly instigated by bands of the urban and rural poor led by men like Peter the Hermit and Walter Sans-Avoir. These groups lacked supplies and discipline. They attempted to reach Coneztinople but most of them never got that far. The leaders in lands which they passed through were frightened and killed many of the crusading bands. Some did get to Coneztinople and traveled across the Bosphorus in August 1096. There they split into two groups. One tried to overtake Nicaea and was unsuccessful. The other was ambushed and slaughtered near Civetot in October. The remaining crusaders retreated to Coneztinople and joined the second wave of the Crusade. The crusaders were eager to start the journey to Jerusalem but they needed to capture the Anatolian Turkish capital of Nicaea first because it blocked the road that would be their main supply route. It was held by Seljuk Turks. In May 1097, the crusaders attacked Nicaea. The Turks realized that they were defeated and agreed to give the city to the Byzantines in exchange for the lives of their men. The Byzantines agreed to this and on June 18, Nicaea was under Byzantine control. The leaders of the crusade disagreed and wanted to slaughter the Turks because they were enemies of Christ.(2) On June 30, 1097, the crusaders were ambushed at the city of Dorylaeum by Seljuk Turks led by Kilij Arslam the Seljuk Sultan. The fight continued until July 1. The crusaders won a big victory and nearly wiped out the Turkish force. This victory opened up the way to Anatolia. The crusaders attacked Anitoch in northern Syria on October 21, 1097. "This was the main obstacle on the road to Jerusalem."(3) In a long and gruesome battle, the city finally fell on June 2, 1098. The crusaders were quickly attacked by a new Turkish army from Al Mawsil. They arrived too late to revive Anitoch's Turkish defenders and they were forced to retreat on June 28. The starting date for the march to Jerusalem was set for November 1, 1098 but was delayed by an epidemic as well as fighting to the south of Anitoch. On January 13, 1099 the commander-in-chief, Count Raymond IV of Toulouse, led the crusaders' march to Jerusalem. They avoided attacks on cities to conserve forces. In May 1099 they reached the northern border of Palestine. On June 7 they camped on the summit of a hill where they could see Jerusalem. Many soldiers had tears of joy on that day. The hill was named Montjoie. Jerusalem was well fortified and only vulnerable from the north and the southwest. On June 13 they tried to storm Jerusalem but were driven back because of insufficient supplies. Extreme heat and a water shortage lowered morale. A priest called Peter Desiderius told them that if they fasted and held

Thursday, November 21, 2019

What Would A World Without Religion Be Like Term Paper

What Would A World Without Religion Be Like - Term Paper Example Religion conjure a deep negative image such as cause of war, an excuse for intolerance, or a shelter for the emotionally weak, in some people while for others, it is the centre of their universe, the source of who and what they are, and the reason for their being. Be that as it may, religion is the greatest of human activities that has influenced cultures and shaped political events. Though there is no universally agreed upon definition of religion, it can be said to be the communal and transcendental quest for the truth about reality. It is this community and transcendence elements in religion that makes religion a most powerful force in human history. Empires have collapsed under the impulse of religion and empires have been founded on religion. But the question is: is the human activity worthwhile given that wars have been fought in the name of religion. How will our world be if religion is eliminated? Will empires still rise and fall? Will there still be wars? Or will peace elude our world? Does religion has a place in our world? Or was it just an invention by some persons to keep others busy? In this term paper, the question: how will our world be without religion will be answered. ... Indeed, religiosity of man is as old as human existence. Various scholars have tried to propose theories to explain the origin of religion. Among these theories include the animism theory of Edward Burnett Tylor and Herbert Spencer; the fetishism theory of John Lubbock; the hedonism theory of Max Muller and the naturalism theory of Wilhelm Mannhardt. According to the naturalism theory, religion started when man seek explanation of natural events. The lack of consensus among religion scholars on the origin of religion may be due to the diverse religion practices and beliefs humans have evolved throughout history. Be that as it may, it evident from archeological findings that religion is as old as man and is part of every human society. The approach to the question In trying to answer the question: how will our world be without religion?, First an examination of the positive and negative effects of religion will be carried out. Thereafter, a non-religious society exemplified by communi st societies in China and the collapsed Soviet Union will be compared with societies that tolerate religion. In this regard, we must distinguish between spirituality and religiosity. While religion incorporates the necessary element of community, spirituality does not. Spirituality is the personal quest for the truth about reality while religion is the communal quest for the truth about reality. This distinction is necessary because spiritually-minded persons need not be religious and could be found in non-religious societies. Religion: the good and the bad There is a powerful two-way relationship between society and the religion. Society exerts

Wednesday, November 20, 2019

Exxon Mobile Research Paper Example | Topics and Well Written Essays - 1500 words

Exxon Mobile - Research Paper Example Its large production operations reserves and diversity, possession of one of the largest E&P portfolios and its technological superiority are some of the benefits attributed to its efficiency. Exxon Mobile markets its products under three brands including Esso, Mobil, and Exxon. The company also owns smaller subsidiary such as Sea River Maritime and Imperial Oil Limited. The biggest cash flow is, however, dominated by the upstream divisions, which account for about 70% of the total revenue (Exxon Mobile Corp, 2011). Company and industry characteristics Primary products Exxon mobile’s primary products include fuels, chemicals, natural gas and lubricants and special products. The fuel products, which is its core activity, is produced in a variety of types including gas oil for industrial applications, heavy fuel oils for power stations, domestic fuel oil for heating in buildings and houses, LPG and diesel for cars and gas oil for industrial applications and heavy fuel oils for p ower stations. Exxon also manufactures lubricants and fuels for the aviation industry. Lubricants and special products are sold under the Mobil brand, which comes in a wide range of amounts and types. The chemicals are classified as petrochemicals, which are produced from petroleum and include the common chemicals that are used in everyday life, such as synthetic rubber, packaging materials, solvents, plastic bottles and other consumer products. Lastly, ExxonMobil produces natural gas, which is in pure form of LPG used as a propellant for manufacturing cosmetics. Competitiveness of the industry The oil and gas industry is operating under a challenging and a dynamic global marketplace and a progressively more adamant group of participants. The regulatory demand is increasingly putting pressure on the operations, and the demand growth is becoming sluggish, while the existing reserves are more expensive and difficult to generate. As the demand to meet future demand builds up, worldwide alliances are becoming more significant. Over the recent years, oil price fluctuation has become the order of the day. In spite of this, the companies in this industry have a challenging task of ensuring they focus on the medium to long-term conditions if they are to make credible decisions and achieve their growth targets. Investing in people, technology and R&D are critical in ensuring a lasting competitive edge. Exxon Mobile’s primary competitors include Chevron Corporation and BP. Chevron is an American multinational energy Corporation with the presence in more than 180 nations. Its operations cover all aspects of gas, oil, and geothermal energy industries that include mining; refinement, marketing and transportation; sale and manufacture of chemicals; and also generation of power. Chevron is among the top 6 major oil companies. (U.S. Energy Information Administration, 2011). Financial statements and ratio analysis Financial statement analysis In financial statements ana lysis, we have used year 2008 to 2011 comparatives. Total revenue reported in year 2008 amounting to $ 433,526,000 dropped to $ 275,564,000 in 2010 (Exxon Mobile Corp, 2011). This significant decline in revenues could be attributed to the effects of global economic depression that had just started to bite and due to sharp rise in prices of fuel products - this forced many people and businesses to use alternative sources of energy. To guard against losses occasioned by reduced economic activity, the

Monday, November 18, 2019

Pathology Assignment on Atheroscelorisis Essay Example | Topics and Well Written Essays - 500 words

Pathology Assignment on Atheroscelorisis - Essay Example Acute coronary syndromes and stroke can result if a ruptured atherosclerotic plaque is superimposed by thrombosis (Falk, 2006; Dugdale, 2010). Normal physiology of arteries Arteries are high-pressure vessels that carry blood to various parts of the body. A cross-section of the normal arterial wall consists of three layers: outer, middle and inner layer. The middle layer or the media consists of tightly packed smooth muscle cells, tissue proteins such as collagen and elastin, and proteoglycans which form gels. The inner layer or the intima consists of loosely packed cells and there are open spaces between the tissue components. The outer layer or the adventitia also consists of loose cells and bundles of collagen and connective tissues. Atherosclerosis occurs in the inner layer or the intima which is a form of connective tissue. These tissues are responsible for providing shape and structure to the body organs. The fibrous tissue proteins such as elastin and collagen which are present in between the cells give strength to the tissue. The arterial intima consists of elastin, collagen and proteoglycans which give strength to the tissue. In addition, the boundary between the arterial intima and the blood is lined by closely packed endothelial cells which prevent the cells and proteins in the blood from coming into contact with the underlying connective tissue (Atherosclerosis, n.d).

Friday, November 15, 2019

FTIR spectroscopy of SO2

FTIR spectroscopy of SO2 Abstract In this lab, the IR spectrum of SO2 gas was taken. The spectrum was then used to determine which peaks corresponded to the vibrational modes of SO2 ­. Once the modes had been determined, the experimental wavenumbers of the v1 and v3 modes and the overtones were used to determine the anharmonicity of the two different modes. While there was a difference between the two modes anharmonicity, overall there was not a significant difference. The modes and their corresponding wavenumbers were also used to calculate the force constants of SO2. The experimental data produced a force constant k1 with 3.112% error while the kÃŽ ´/l2 constant had a 2.963% error. Introductions IR spectroscopy is the detection of a transmittance or absorption intensity of change as a function of frequency1. In recent years, Fourier transform spectrometers replaced the traditional dispersive spectrometer because they are faster and more sensitive. They have made it possible to analyze many areas which were not possible with the dispersive spectrophotometer. The difference is the simultaneous examination of all frequencies. The three basic spectrometer components in a FT system are the radiation source, interferometer and detector. The radiation source in precision FTIR instruments is often water-cooled in give it more power and stability2. Figure 1. shows a diagram of the interferometer and the schematics of the spectrophotometer as a whole. The interferometer has the following three components: a moving mirror, fixed mirror, and a beamsplitter.. The beamsplitter is a semireflecting geranium thin film of small particles deposited on flat KBr substrate. Radiation from the broadband IR source is focused into the interferometer, and hits the beamsplitter. Once the beam hits the beam splitter, half of it is transmitted to the fixed mirror while the other half is transmitted to the moving mirror. The changing position of the moving mirror relative to the fixed one generates an interference pattern and causes the two beams to oscillate in and out of phase. When the beams are in phase, there is a constructive interference resulting in the maximum detector response. However, when the beam is out of phase, there is a deconstructive interference between the two beams. Once they have been reflected from both mirrors, they recombi ne at the beam splitter. The recombined beam passes through the sample and then focuses on the detector2. The intensity of the radiation hitting the detector will vary in a sinusoidal manner while the mirror is moving at constant velocity. The record of the interference signal is the interferogram and is a time domain spectrum. The detectors response changes versus time within the mirror scan are recorded. When a sample absorbs at a certain frequency, the amplitude of the sinusoidal wave reduces proportionally to the amount of sample in the beam. In an IR spectrophotometer, this process happens in three component frequencies, which creates a more complex interferogram2. To convert these interferogram recordings to the IR spectrum, a Fourier transformation is used. Small, precise intervals are used during the mirror scan. The rate of the sampling behavior is controlled by a monochromatic beam produced by a helium neon laser focused on a separate detector2. For this analysis, the mid IR spectrophotometer utilized a KBr beamsplitter and a mercury cadmium telluride (MCT) detector. MCT detectors are photon detector with a dependence on the quantum nature of radiation. They also exhibit very fast responses. They must be at a constant temperature of 77^(o)K, the temperature of liquid nitrogen. It is faster and more sensitive than the alternative detector, the deuterated triglycine sulfate (DTGS) 2, which was used for the far IR analysis. The cell used to hold the SO2 gas can be seen in Figure 2. A molecules energy can be split into three components: the electrons motion, the constituent atoms vibrations and the whole rotation of the molecule. While electronic transitions happen on a short timescale, rotational transitions happen on a longer time scale. When a molecule is placed in an electromagnetic field, such as light, energy from the light is transferred from the field to the molecule. This happens upon the satisfaction of Bohrs frequency condition: ΔE = hv When a molecule is excited from one state to another, the energy difference between the two states is absorbed by the molecule. When the molecule reverts back to the previous state, the change in energy which was absorbed upon excitation is then emitted1*. A molecule will be excited by photons which possess the appropriate energy3. Vibrational transitions are observed in the infrared (IR) spectra which are about the 103 ~ 104 cm-1 region. These transitions are caused by the vibration of the nuclei constituting the molecule. The rotational transitions occur at 1-103 cm-1 region, the microwave region, while the electronic transitions occur at 104-106 cm-1 region, the UV-visible region. As the vibrational quantum number v increases, the rotational intervals tend to decrease. The vibrational fine structure of electronic transitions can give insight to the structural and bonding information about molecules which are electronically excited1*. A system displaced from its equilibrium force will be restored due to a restoring force provided by the elasticity of the system. However, there is a property of inertia which causes the system to over correct for the displacement. The back and forth actions of elasticity and inertia cause the system to have oscillatory motion4. When the potential energy is graphed versus the internuclear separation, a perfect harmonic oscillator forms a parabola. The energy spacing in a harmonic oscillator does not change throughout the well of the parabola and is equal to hω where ω=km12 and the zero point energy is Eo= 12hω When a system is not a perfect harmonic oscillator, it is considered anharmonic. Anharmonicity forces the right side of the parabola to widen and asymptotically approach zero. The spaces between the permitted states are not evenly spaced as they were in the harmonic system5. The comparison of the two graphs can be seen if Figure 3. One of the possible ways to calculate xe, a term which shows the anharmonicity of a system is to graph ?G/? versus (?+1). This yields a graph with an equation as follows ΔGv=v+ 1xeve+ ve By dividing the xeve term by ve, the xe term is found. The larger this number, the more anharmonic the system is and vise versa5. Covalent bonds of molecules are not rigid as ball and stick models would suggest, but rather they can be compared to stiff springs which are capable of stretching and bending. More energy is required to stretch and compress a bond than it does to bend it. There is a direct relationship between the energy or frequency which characterizes the stretching vibration of a bond and the bond dissociation energy3. The major factors which are influencial in the stretching frequency of a covalent bond can be seen in the following equation: v = 12rck(m1+m2)m1+m2 where v is the frequency, k is the force constant, c is the speed of light, and m1 and m2 are the masses of the two atoms on each end of the bond. This equation corresponds to the rigidness of the oscillation. However, it should be noted that not all molecular vibrations are capable of being observed in the infrared region. In order to be seen in an IR spectrum, a vibration must cause a change in the dipole of a molecule. This change in charge distribution allows the molecule to absorb infrared light. There is a proportional relationship between the change in charge distribution and the absorption: the greater the change, the stronger the absorption3. All vibrating physical objects have a set of normal modes6. A normal mode can be defined as a simple harmonic oscillation which occurs about an area which is local and low in energy. The normal modes are determined by the systems structure R and its energy function V(R ). Any motion can be expressed as a superposition of normal modes when a pure harmonic V(R ) is being considered. However, the near minimum potential can still be approximated by a harmonic potential for an anharmonic V(R ). Also, small-amplitude motions can still be described by the sum of normal modes. This means that all systems behave harmonically at low temperatures7. For SO2, it is necessary to have nine Cartesian coordinates in order to determine the positions of all three nuclei. Therefore, the molecule is considered to have nine nuclear degrees of freedom. The first three are necessary to describe the position of the center of mass of the molecule. If these three degrees change, it represents the translational movement of the molecule in space. The next three degrees of freedom refer to the orientation of the molecule. These three degrees can be described as the angles of the molecule. If these three degrees change, then the molecule has rotated. The three remaining coordinates are those used to describe the relative positions of the three atoms. These are called vibrational coordinates8. To describe the vibrations of a bent trigonal molecule, it makes sense to use the valence coordinates. The valence coordinates consist of the two bond lengths and the bond angle. However, they do possess a drawback. If energy is put into a bond so that it stretches, to observe how the molecule reacts is difficult due to the energy put into the stretched bond quickly flowing into the vibrations of the other bond in the molecule. Because of this, it is said that the stretching of a single bond and other vibrational motions are coupled8. By varying the coordinates, which are the linear combinations of changes in the bond lengths and bond angles, a good uncoupled approximation can be made. These coordinates are called the normal coordinates. Motions which take place in these coordinates are appropriately called normal modes of vibration. The center of mass does not move in these coordinates8. A non symmetric molecule with N number of atoms will have 3N-6 normal modes. This means SO2 will have 3(3)-6 = 3 normal modes. The normal modes for SO2 can be seen in Figure 3. The symmetric stretch is labeled as v1, the bend is labeled v2, and the asymmetric stretch is labeled v3. When a molecule is exhibiting one of the vibrational modes, it travels the path indicated by the arrow, stops, and then returns back to its starting position8. It is possibly to express the three normal modes as a potential-energy function written in terms of bond stretching and angle bending as shown in the following equation: V = 12k1(R1-Re)2+ 12k1(R1-Re)2+ 12kb(ÃŽ ¸-ÃŽ ¸e)2 where R1 and R2 are the first and second bond length of S-O, Re is the equilibrium S-O bond length, ? is the bond angle of O-S-O, and ?e is the equilibrium value. The constants ks and kb ­ are for the stretching and bending respectively9 ­. Though the derivations are difficult, it was found that the following equations are derived from eq. (1) and are used to calculate both constants: 4r2v32 = 1+2momssin2ÃŽ ±k1mo 16r4v12v22 = 21+2momssin2k1moÃŽ ±kÃŽ ´l2 4r2v12+v22 = 1+2momscos2ÃŽ ±k1mo+2mo1+2momssin2ÃŽ ±kÃŽ ´l2 where v# is the wavenumber of that particular mode, 4?3 is expressed as 5. 8918E-5 in order to obtain units of Nm-1, mo is the mass of oxygen, ms is the mass of sulfur, ? is 59.75^(o), and k?/l2 is the same as the kb constant used in equation (6)10. Diatomic molecules possess only one vibrational coordinate which is quantized. This means that only specific results will be obtained for the value of the vibration. The quantum mechanical harmonic oscillator upon first approximation gives the allowed levels of a diatomic molecule. Polyatomic molecules are similar. Each normal mode has quantized energy, and can be approximated by the harmonic oscillator model when at low energy levels. The frequencies associated with bending tend to be lower than the frequencies associated with stretching10. It is possible to see normal modes via IR spectroscopy if they have a change in dipole in the molecule when it stretches or bends10. All of the normal modes in SO2 are IR active and therefore can all be seen in the IR spectrum at the fundamental frequency. It is possible to observe other weak bands in the spectrum which are a result of overtones. Overtones occur because anharmonicities. They usually happen at integer multiples of 2 or 3 of the fundamental frequencies and are caused by two modes being simultaneously excited10. These bands are located at frequencies which are approximately the sum or difference of the two modes which were excited and are weak10. Method About 1.5g of drierite was weighed out and placed in the barrel of a syringe and the plunger was inserted almost entirely into the barrel. A 3 cm piece of rubber tubing was attached to the tip of the syringe. A 1.5 g of sodium hydrogen sulfite was measured and placed in a vial cap that was small enough to fit into the syringe barrel. The filled vial cap was then into the syringe using a bent spatula to prevent the sodium hydrogen sulfite from spilling into the barrel. The plunger was pushed into the syringe as far as it would go. To ensure that none of the sodium hydrogen sulfite was spilled, the syringe was placed tip down in a beaker. The next step was placing 15 mL of 6 M HCl into a small beaker. All of the acid was then drawn into the syringe containing the vial cap very carefully as to not let any of the acid mix with the sodium hydrogen sulfite. The plastic lid was then screwed onto the syringe. Once the cap was secure on the tip, the syringe was shaken so that the acid and the sodium hydrogen sulfite mixed. As SO2 gas was being produced, the plunger on the syringe was pulled out simultaneously. The high pressure of the gas in the syringe caused the cap on the tip to leak so it was necessary to apply pressure to the tip to prevent it from spitting acid out. Once the reaction had stopped producing gas, the syringe was inverted so that the tip was pointing up and the liquid was at the bottom of the barrel. The cap was removed and the tip was connected to the other end of the rubber tubing attached to the syringe containing drierite. At this point the syringe containing drierite was above the syringe containing the SO2 gas. As the plunger in the bottom syringe was being pushed in, the plunger in the top syringe was being pulled out; making sure no liquid was pushed through the tubing and into the top syringe. The top syringe, now containing the SO2 gas, was capped and allowed to sit for five minutes in order for the drierite to dry the SO2 gas. The excess HCl in the reaction syringe was expelled into a waste beaker. 15 mL of NaOH was placed in a beaker and then drawn up into the syringe in order to destroy any remaining SO2. The NaOH was then also expelled into the waste beaker. After the syringe containing the gas had sat for five minutes, the IR gas cell was placed in the hood. The syringe containing the SO2 was then attached connected to the gas cell using another piece of rubber tubing. Both stopcocks on the gas cell were opened and the gas was pushed into the cell. Both stopcocks were then immediately closed to prevent any of the SO2 from leaking out. A spectrum in the range of 700-2500 cm-1 was obtained using an FTIR spectrophotometer. In order to get a good spectrum from the mid IR range, the cell was undiluted. However, to obtain a good spectrum in the far IR range, it was necessary to dilute the gas cell. Once the spectrum had been obtained, the gas cell was placed inside a fume hood. Both stopcocks were opened up and a syringe was used to flush air through the gas cell. The gas cell was then placed in a vacuum sealed dessicator with the stopcocks open in order to dry out any moisture that may have entered the cell during the experiment. Results The IR spectra of SO2 can be seen in Figure 5. By looking at what wavenumbers the peaks appeared at, it could be concluded which peak corresponded to each vibrational mode of SO2. The bending of a molecule happens at lower wavenumbers, so it was concluded that graph in the top right corner corresponds to the ?2 vibration. It was known from literature that the stretches occur somewhere between 1000 and 1500 cm-1 so the graph in the bottom right must correspond to the overtones of SO2s ?3 and ?1 modes. It is known that asymmetric stretches always correspond to higher wavenumbers. So it was concluded that the next two peaks on the spectrum were ?1 and ?3 respectively. The actual experimental wavelengths of each mode can be seen it Table 1. There are two overtones present, one from the ?1 mode and another from the ?3 mode. The lower frequency overtone corresponds to the lower-frequency mode. Thus the lowest overtone is that of ?1 while the second seen overtone comes from the ?2 mode. Using the experimental wavenumbers for each mode, both constants could be found using eq. (7) first to solve for k1. This values was calculated to be 1000.858 Nm-1. The litereature value is 1033 Nm-1 and the percent error in the experimental value was 3.112% The calculated value of k1 was then used in eq. (8) to find the k?/l3 constant. The second constant was calculated to be 78.60 Nm-1. Literature value for this constant is 81 Nm-1 and the percent error in the experimental calculation was 2.963%. To evaluate the effectiveness of this method for finding the constants, both sides of eq. (9) were solved for. The left side equaled 93.77 Nm-1 while the right side equaled 95.54 Nm-1. The percent difference between these two values is 1.85%. In order to determine the harmonicity of each of the modes of vibration, the ve and vexe values were calculated. This was done by graphing ?G/v versus (v + 1) in Microsoft Excel. The ?G corresponds to the wavenumber of the overtone seen on the IR spectrum. ?G was then divided by v. The overtones corresponded to v=2 while the normal mode bands corresponded to ?=1. Graphs for both the ?1 mode and ?2 mode can be seen in Figure 6. Excel was then used to fit a trend line and produce a y = mx + b equation for the data. The slope of the equation was vexe and the intercept was ve. To determine the anharmonicity of the two modes, it was necessary to solve for xe. This was done using eq (4). The calculated values for xe in the ?1 mode was 1.0612 and for the ?3 mode was 0.07891. This means that the ?1 mode is more anharmonic than the ?3 mode. Conclusion For this lab, SO2 ­ was prepared and then studied via FTIR spectroscopy. The three modes of SO2 were identified on the IR spectra obtained. It was determined that the lowest energy of bending correlated to the lowest frequency peak. The second highest frequency peak was determined to be ?1 since the symmetric stretch is lower in energy than the asymmetric stretch (?3) which is the third highest frequency peak. The wavelengths determined from the IR spectra were used to calculate the constants k1 and k?/l3. It was determined from the numbers crunched from eq. (6) that the used method of determining the constants was an accurate method. Also, the anharmonicity of the modes ?1 and ?2 were calculated and compared. The graph of ?G/vversus (v + 1) produce an equation of y = mx + b which provided the values of xeve and v ­e. These values were then used to find xe, which described the anharmonicity of each mode. The ?1 mode was found to be more anharmonic due to its greater xe value whil e the ?3 was found to be more harmonic. Refrences What is Infrared Spectroscopy?. (n.d.). Mount Holyoke College, South Hadley, Massachusetts. Retrieved December 11, 2009, from http://www.mtholyoke.edu/~mlyount/MySites/ForensicSpectroscopy/WhatIsIR.html Nakamoto, Kazuo.Infrared and Raman Spectra of Inorganic and Coordination Compounds. Sixth Edition ed. Hoboken, NJ: Wiley Sons, Inc., 2009. Print. Hsu, S. (n.d.). Infrared Spectroscopy. prenhall.com. Retrieved December 6, 2009, from www.prenhall.com/settle/chapters/ch15.pdf Chem.msu.edu. (n.d.). Nature of Vibrational Spectroscopy. Retrieved November 30, 2009, from 2http://www.cem.msu.edu/~reusch/VirtualText/Spectrpy/InfraRed/irspec1.htm#ir1 The Simple Harmonic Oscillator. (n.d.). PAWS Personal Accessible Web Space Kettering University. Retrieved December 12, 2009, from http://paws.kettering.edu/~drussell/Demos/SHO/mass.html Atkins, P., Friedman, R., Paula, J. D. (2008). Rotational and Vibrational Spectra. Quanta, Matter and Change: A Molecular Appraoch to Physical Change (pp. 315-318). New York: W. H. Freeman. Normal mode Wikipedia, the free encyclopedia. (n.d.). Wikipedia, the free encyclopedia. Retrieved December 11, 2009, from http://en.wikipedia.org/wiki/Normal_mode Normal Mode (Harmonic) Analysis. (n.d.). Center for Molecular Modeling. Retrieved December 11, 2009, from http://cmm.cit.nih.gov/intro_simulation/node26.html Vibrational Spectroscopy. (n.d.). med.upenn.edu. Retrieved December 10, 2009, from www.med.upenn.edu/bmbgrad/Faculty/Master_List/Vanderkooi/course_notes/8.vibrational.pdf Sulfer Dioxide Vibration. (n.d.). d.umn.edu. Retrieved November 30, 2009, from www.d.umn.edu/~psiders/courses/chem4644/labinstructions/SO2spartan.pdf Infrared Spectroscopy of SO2. (n.d.). Spectroscopy and Structure Chem 4591. Retrieved November 30, 2009, from 3http://www.colorado.edu/chemistry/chem4581_91/SO2.pdf

Wednesday, November 13, 2019

Henry V - Film :: essays research papers

The film uses various techniques to present a particular view of the war against France. What is that interpretation and how does the film convey it?Although the Branagh version of Shakespeare's Henry V remains very close to the text, with only a few lines left out of the film, the movie portrays a very clear and distinct message about war and Branagh's opinion on the matter. Henry V is fundamentally a play about war, and it would have been very easy for Branagh to make his version of the play into a film that glorified war. Instead, Branagh took the opportunity to make a statement about what he felt was the true essence of wars - both medieval and modern.It is clear through Henry V that Branagh thinks that wars are a waste of precious human life, and in the end are fruitless, causing more loss than gain. From the very first battle at Harfleur Branagh's low opinion of war is shown. When we first see the fighting, it is dusk and the sky is further darkened by smoke, instantly creating a morbid feeling. Combined with the muddy and wet terrain, the cheerless soldiers and the overbearing size of the castle which they hope to achieve, it is clear not only that the English army must fight against all the odds to win, but that even the conditions are detrimental to the English cause.The scene where Bardolph, Nym and Pistol are backing away from the battle to save themselves is an important inclusion to the film. Had Branagh intended the film to be a glorification of war, this small scene could have easily been removed. However, he chose to keep it in his film because it actually assists the message which he attempts to convey. This scene, although still clearly comical, as Shakespeare intended it to be, it implies that not all soldiers are valiant and brave and that war is so terrible that s oldiers are willing to desert their friends and fellow countrymen because of the hideous nature of war.After the battle of Harfluer is won by the English and they begin to make their way towards Agincourt, Branagh seizes the opportunity to show the viewer the 'victorious' army. Although he could have shown them to be joyful with their win, Branagh instead shows the war-weary, bloody, wet and muddy soldiers. It is raining and so the already miserable soldiers, wearing torn and ragged clothing are forced to bow their heads as they slowly make their way down the road in a way reminiscent of a death march, the sombre mood of the scene assisted by the music. Henry V - Film :: essays research papers The film uses various techniques to present a particular view of the war against France. What is that interpretation and how does the film convey it?Although the Branagh version of Shakespeare's Henry V remains very close to the text, with only a few lines left out of the film, the movie portrays a very clear and distinct message about war and Branagh's opinion on the matter. Henry V is fundamentally a play about war, and it would have been very easy for Branagh to make his version of the play into a film that glorified war. Instead, Branagh took the opportunity to make a statement about what he felt was the true essence of wars - both medieval and modern.It is clear through Henry V that Branagh thinks that wars are a waste of precious human life, and in the end are fruitless, causing more loss than gain. From the very first battle at Harfleur Branagh's low opinion of war is shown. When we first see the fighting, it is dusk and the sky is further darkened by smoke, instantly creating a morbid feeling. Combined with the muddy and wet terrain, the cheerless soldiers and the overbearing size of the castle which they hope to achieve, it is clear not only that the English army must fight against all the odds to win, but that even the conditions are detrimental to the English cause.The scene where Bardolph, Nym and Pistol are backing away from the battle to save themselves is an important inclusion to the film. Had Branagh intended the film to be a glorification of war, this small scene could have easily been removed. However, he chose to keep it in his film because it actually assists the message which he attempts to convey. This scene, although still clearly comical, as Shakespeare intended it to be, it implies that not all soldiers are valiant and brave and that war is so terrible that s oldiers are willing to desert their friends and fellow countrymen because of the hideous nature of war.After the battle of Harfluer is won by the English and they begin to make their way towards Agincourt, Branagh seizes the opportunity to show the viewer the 'victorious' army. Although he could have shown them to be joyful with their win, Branagh instead shows the war-weary, bloody, wet and muddy soldiers. It is raining and so the already miserable soldiers, wearing torn and ragged clothing are forced to bow their heads as they slowly make their way down the road in a way reminiscent of a death march, the sombre mood of the scene assisted by the music.