Prediction of Cross-Axis-Sensitivity of Inertial Micro-Sensor Through Modeling and Simulation

Prediction of Cross-axis-sensitivity of inertial micro-sensor through modeling and simulation B. P. Joshi1, A. B. Joshi2, A. S. Chaware2 , S. A. Gangal*2 1 Armament Research & Development Establishment (ARDE), DRDO Ministry of Defence, Dr Homi Bhabha Road, Pashan Pune-411021, India Ph. No. +91-20-2588 4795, Fax No. +91-20-2589 3102 E-mail:[email  protected] org 2 Department of Electronic Science, University of Pune, Pune-411 007, India Abstract: In addition to sensitivity and bandwidth, the cross-sensitivity is an important design parameter for acceleration/ inertial sensor design. In this paper prediction of cross-axis sensitivity of cantilever type of piezoresistive accelerometer is discussed. The effect of variation in geometrical parameters such as width and thickness of flexure & proof mass (PM) on crosssensitivity are studied. Optimization of cross-sensitivity by varying geometrical parameters has been attempted. This paper deals with simulations of skewed type (Flexure perpendicular to proof mass) and planar type (Flexure in plane with Proof mass) structure for cross-axis sensitivity analysis. The simulation and modeling has been carried using Coventorware MEMSCAD software. Keywords: Inertial sensor, Cross-sensitivity, MEMSCAD, FEM. 1 Introduction Micromachined accelerometers are widely used in many applications. Large number of scientists all over the world are working on MEMS based acceleration sensors that are mostly either capacitive or of piezoresistive type. A piezoresistive type of acceleration sensor basically consists of a proof-mass attached to a micro-cantilever (Flexure) all made out of silicon. [1-4]. For piezoresistive accelerometer sensitivity S is defined as relative change in resistance per unit of acceleration. Following mathematical equation defines relation between sensor dimensions and its sensitivity [5]. Equation for sensitivity can be written as: S = K . g . L t 2 (In Pa. ) †¦Ã¢â‚¬ ¦ Eq. 1 Where, S is the sensitivity [stress level], g is the applied acceleration, t is thickness of flexure in  µm, L is length of flexure in  µm, K is the constant of proportionality. An accelerometer is expected to have only one sensitive axis. However, cantilever type of accelerometer is also sensitive in other direction. This undesired sensitivity is called as cross axis sensitivity. Cross axis sensitivity is the maximum sensitivity in the plane perpendicular to the sensitive direction relative to the sensitivity in the measuring direction. It is calculated as the geometric sum of the 1 sensitivities in two perpendicular directions in this plane [6]. If Z is sensitive axis then cross sensitivity is defined as †¦Ã¢â‚¬ ¦Eq 2 Where suffix (x, y, z) denotes axis in which sensitivity is measured. Effect of cross sensitivity is one of the most important design considerations. Many attempts have been made to reduce cross sensitivity by the accelerometer designers. 7-8]. Since it is a structure deflecting under influence of inertial force, stress is developed in the flexure due to its bending. Therefore it can be stated that if the width of flexure is much greater than its thickness the cross axis sensitivity will be low. Different types of mechanical designs and structures have been tried by designers to reduce cross-sensitivity effect. Efficient use of four-piezor esistors in bridge structure is mostly tried structure [7]. Another way to reduce cross sensitivity is multi flexure accelerometer [8]. However, all these structures have a major drawback, that is, they require more processing steps as well as larger size on chip. In this paper, single cantilever type piezoresistive accelerometer is presented. The crosssensitivity is analysis is carried out by varying width as well as thickness of flexure and proof mass. Paper discusses simulations carried out for skewed and planner structure accelerometer using Coventorware software. 2 Simulations Cantilever (Flexure) type of piezoresistive accelerometer is modeled and simulated using Coventorware 2003 software. Fig. shows Skewed type acceleration sensor structure, in which Flexure is perpendicular to proof mass and sensitive axis is Y-axis. The sensor is modeled with proof mass having dimension of 2000 µm X 400 µm X 200 µm (LxWxH) and flexure is having dimensions of 100 µm X 50 µm X 12 µm (LxWxH). In this structure, flexure width is in Z-axis and flexure thickness is in Y-axis. Fig. 2 shows the planar type of accelerome ter of the above dimension, in which flexure is in plane with Proof Mass. In this case, flexure width in Y-axis, thickness is in Z-axis. Z-axis is sensitive axis. Simulation is carried out using MemMech solver. The Max stress values are considered for discussion in terms of sensitivity. Z Y X Fig 1: Skewed piezoresistive Accelerometer Fig 2: Planar Piezoresistive Accelerometer 2 Simulations are carried out to find cross-axis sensitivity by varying flexure thickness & flexure width. Simulations are also carried out to find cross-axis sensitivity by varying thickness and width of proof mass. 3 Results and discussions 3. 1 Skewed structure (Fig 1) Simulations were carried out on skewed type of structure (of dimension mentioned in simulations above) by varying its lexure thickness. Flexure thickness is varied from 50  µm to 200  µm and flexure width is kept as 12  µm. Skew structure response for variation in flexure thickness is shown in table No. 1. Here sensitive axis is Y-axis. Table 1: Cross axis sensitivity w. r. to variation in Flex thickness for skewed structure Flexure thickness In  µm 50 100 150 200 Sz Sx Sy (In MPa) (In MPa) (In MPa) 82 6. 5 340 22 1. 5 170 9. 8 0. 52 110 5. 6 0. 19 81 % Cross-Sensitivity 24. 19 12. 97 8. 92 6. 92 Thickness to width ratio 4. 17 8. 33 12. 50 16. 67 It is observed that as the flexure thickness is increased while keeping the width same, cross axis sensitivity decreases but at the cost of sensitivity, which is not acceptable. To minimize this undesirable cross-sensitivity effect, structure is modified. In modified structure, flexure is in plane with proof mass. [Fig no. 2] Further simulations are carried out with Planner structure. 3. 2 Planar Accelerometer Planner accelerometer of above-mentioned dimensions was simulated. Varying geometrical parameters like thickness & width of proof mass as well as flexure simulations were carried out. The results are given in following paragraphs. Here sensitive axis is Z-axis. 3. 2. 1 Variations in flexure width(FW) Simulations are carried out in MEMMECH Solver by varying flexure width from 12 µm to 30  µm while keeping flexure thickness same as 50  µm. Following table shows effect of flexure width on sensitivity as well as cross-sensitivity. Table 2: Cross axis sensitivity for various flexure widths of planar structure Flexure Width (In  µm) 12 18 24 30 Sensitivity Sx Sy Sz(In MPa) (In MPa) (In MPa) 330 28 25. 2 150 13 11. 29 83 7. 4 6. 34 54 4. 9 4. 07 % Cross axis Sensitivity 11. 42 11. 48 11. 74 11. 80 Thickness to width ratio 4. 7 2. 78 2. 08 1. 67 3 It can be seen from the above results that as thickness to width ratio reduces cross-sensitivity marginally increases but effecting drastic reduction in sensitivity of the sensor. 3. 2. 2 Variation in flexure thickness (FT) Simulations are carried out in MEMMECH solver by varying flexure thickness from 50 to 125  µm. F ollowing table shows effect of flexure thickness on sensitivity as well as cross-sensitivity. Table 3: Cross axis sensitivity for various flexure thickness of planar structure Flexure Width (In  µm) 50 75 100 125 Sensitivity Sx Sy Sz(In MPa) (In MPa) (In MPa) 330 28 25. 220 19 14 160 14 8. 8 130 11 5. 9 % Cross sensitivity 11. 42 10. 73 10. 34 9. 60 Thickness to width ratio 4. 17 6. 25 8. 33 10. 42 The simulation results show noticeable reduction in cross-sensitivity as the thickness to width ratio increases. This is because as the flexure becomes more and more stiff, cross-sensitivity decreases. 3. 2. 3 Variation in Prof mass width (PMW) Simulations are carried out in MEMMECH solver by varying proof mass width. It is varied from 400 µm to 1000 µm. Here the flexure dimensions are kept original as 100 µm X 50 µm X 12 µm (LxWxH). Following table shows the effect of proof mass width on sensitivity as well as crosssensitivity. Table 4: Effect of Proof-Mass Width variation on cross sensitivity of planar structure PM Width (In  µm) 400 600 800 1000 Sensitivity Sz(In MPa) 330 490 660 830 Sx (In MPa) 28 41 54 66 Sy (In MPa) 25. 2 37. 8 50. 5 63. 2 % Cross axis Sensitivity 11. 42 11. 38 11. 20 11. 01 It can be seen from above results that Variations in Proof mass width have negligible effect on cross sensitivity but helps to increase the sensor sensitivity by many folds. This is due to increase in proof-mass weight. 3. 2. Variation of Prof mass thickness (PMT) Simulations are carried out in MEMMECH solver by varying proof-mass thickness. It is varied over from 50 µm to 200 µm. Here also the flexure dimensions are kept as 100 µm X 50 µm X 12 µm (LxWxH). Following table shows effect of proof mass thickness on sensitivity as well as cross-sensitivity. 4 Table 5: Effect of Proof-Mass thickness variation on c ross sensitivity of planar structure PM Thickness (In  µm) 200 150 100 50 Sensitivity Sz(In MPa) 330 250 160 82 Sx (In MPa) 28 16 6. 8 1. 6 % Cross axis Sy Sensitivity = RMS of Sx (In MPa) &Sy / Sz 25. 2 11. 42 13. 57 8. 39 5. 47 5. 45 0. 95 2. 27 It can be seen from above results that cross-sensitivity decreases considerably with decrease in Proof Mass thickness but at the heavy cost of sensitivity. This due to decrease in proof mass weight. Fig No. 3 gives summary of variation in cross-sensitivity with respect to each of the above discussed parameters. Cross Axis Sensitivity for various geometrical parameters. 14. 00 12. 00 % cross-sen. 10. 00 8. 00 6. 00 4. 00 2. 00 0. 00 1 2 3 4 FT PMW FW PMT Fig 3: Graph of summary of variation in cross-sensitivity for geometrical parameters The proof mass width and flexure thickness doesn’t have much impact on cross sensitivity. In case of flexure width variation, cross sensitivity decreases along with increase in flexure width. The bending stress caused by transverse acceleration in X, Y direction is much less then stress caused by desired acceleration in Z direction. Thus for low cross-sensitivity, Ratio of width to thickness should be high. These results have good agreements with earlier reported results [7-8] 4) Conclusions A cross sensitivity effect is studied by varying geometrical parameter like thickness as well as width of flexure and proof mass. Following conclusions can be drawn from all of the above simulation Skewed structure has much higher cross-sensitivity as compared to planar type of structure for the same thickness to width ratio of flexure. (Compare values of in table 1 and 2 for thickness to width ratio of 4. 17). But they have similar sensitivity. When Thickness to Width ratio is increased to 8. 33 in case of skewed structure its crosssensitivity drastically reduces but is still higher than plan structure. One can safely increase sensor sensitivity by increasing proof mass weight by increasing width in planar structure. Variations in flexure thickness and Proof Mass width doesn’t affect cross ensitivity. For better low cross-sensitivity, thickness to width ratio of flexure for planar type of design should be as low as possible and further sensitivity can be enhanced by increasing proof mass width. 5 Acknowledgements The authors thank ARDE, Pune, Ministry of Defence for funding the research work on development of micro accelerometer at University of Pune. Shri BP Joshi, Scientist ‘F’, would like to thank Director ARDE for giving opportunity to work on the project and also to Dr. S. K. Salwan (Guide for Ph. D. ) for his valuable guidance and suggestions. References 1. J. A. Plaza, J. Esteve, E. Lora-Tamayo, Simple technology for bulk accelerometer based on bond and etch back silicon on insulator wafers, Sensors and Actuators, A68, 1992, p199-302 2. Aaron Partridge, J. Kurth Reynolds, Benjamin W. Chui, Eugene, M. Chow, A HighPerformance Planar Piezoresistive Accelerometer, JMEMS, vol 9, No. 1, March 2000, p 58-66. 3. R. P. Van Kampen, R. F. Woffenbuttel, Modelling the mechanical behaviour of bulkmicro machined silicon accelerometers, Sensors and Actuators, A64, 1998, p137-150 4. L M Roylance and J B Angell, â€Å" A batch fabricated silicon accelerometer. IEEE Trans. Electron Devices, vol. ED-26. pp. 1911-1917. Dec. 1979. 5. Sabrie Soloman, Sensors Handbook, MGH Publications, 1998 pg no 66. 31 6. Kaiyu chen. A survey of piezoresistive semiconductor accelerometer. EE663 microelectronic sensor project report. 7. H. crazzolara, G. Flach, W. von Munch. Piezoresistive accelerometer with overload protection and low cross-sensitivity. Sensor and actuators A . 39(1993)201-207 8. Homg chen, Mihang bao. A piezoresistive accelerometer with novel vertical beam structure. Sensor and actuators. A63(1997) 19- 25. 6

Psychology of Social Influence

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American History Essay Example | Topics and Well Written Essays - 250 words - 3

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Security Management in Maritime Organisations Case Study

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Realism, Liberalism and Marxism Essay Example | Topics and Well Written Essays - 2500 words

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The Role Of Electronic Communication Essay Example for Free

The Role Of Electronic Communication Essay Introduction Advertising, IMC and mass communication are some of the proven methods for achieving maximum results for demonstrating a product for sale. Whether it is movies, FMCGs, industrial electronics or automobiles. General Motors, Procter Gamble and AOL spend $2 billion dollar on advertising. McDonald’s spends $1.3 billion per year on advertising. Warner Brothers, Walt Disney and MGM also spend billions of dollars for advertising of cartoons and movies.  Ã‚  Ã‚   In a survey of marketing professionals, it was identified that, media advertising (26 per cent) public relations (25 percent) product placement (13 per cent) opined that these are the worst tools of providing return on investment. Consequent to these opinions, there emerged Integrated brand promotion (IBP) which includes direct marketing, sales promotions and coupons are some of the tools which maximize return on investment.   In spite of all these facts, advertising still continues to be dominant by spending billions of dollars in the media which draws an acceptable fact that advertising is influencing which IBP cannot do for deriving ROI.   â€Å"Integrated Management Communication (IMC) is a process of using promotional tools in a unified way so that a synergistic communication effect is created â€Å" (Thomas C.O,Guinn, p.38) Whereas practice of advertising ethics in the words of Chris moore, Ogilvy and Mather      â€Å"80% of American companies have a written code of ethics and probably 100% of you do too, if you gave it some thought and wrote it down. Ethics happen, or don’t in our relationships with others. Advertisers are in the business of communicating with thousands, even millions of others’ all the time. That gives us thousands or millions of chances to practice what we believe everyday. And try to get it right.† Research question People continue to use television, mobiles, radio, internet, magazines and   newspapers for both domestic and work purposes which gives a clear indication that advertising and communication have speed up the activities of business whether it is in mobiles, electronics or automobiles or FMCGs. H.J.Heinz Company which manufactures green chilli sauce, red chilli sauce, paprika   and   soya sauce has designed its own guidelines for consumer education, public relations, marketing communications and advertising. The company has also its own set of general principles in terms of advertising and communication.  Ã‚   In Darden school of business, there is a team of seven professionals who possess vast experience in communications and marketing.   The impart of education has passed several stages reaching the acme of perfection and innovation. With the above discussion, it cannot be concluded that tech-savvy days have made the role of advertising and communications saturated.   There is still scope for research whereas one definite research question that arises in the minds of companies which is that media that catches the eye of consumer in advertising that sells products faster,   quicker and helps in better target achievement ?. With the availability of world wide web,   advertising, marketing and   selling have become much easier for companies. Another advantage is Internet advertising is proving cost effective for companies as it is tapping millions of customers who are shopping online. Virtualflowers.com sells flowers, gift articles   online and   delivers   the articles and flowers on time all over the world.  Ã‚  Ã‚   There are such other multinational companies such as Microsoft, Dell,   Intel and HP who with the advantage of Internet advertising and marketing have made business a great success by supplying computers, accessories and printers. Research question and explanation    Which is that media that catches the eye of consumer in advertising that sells products faster,   quicker and helps in better target achievement ?. Integrated Marketing Communication (IMC) has gained excessive prominence as a new paradigm which states some of the facts that television is no longer holds good view for marketing whereas database is considered as powerful tool for marketing.   Old concepts, strategies and single selling messages   are considered to be invalid by companies with the changing tech-savvy times.   Some of the important tools of IMC are direct marketing, event sponsorship, sales promotions, Internet and   public relations.   Every business needs an idea to advertise and market its product. There is required to be a perfect connection or link of communication between a customer and a company using advertising and marketing as an effective tool to convey a message to purchase products while signifying   importance of products along with use and benefits through advertising and marketing. Finelight.com is one professional company which helps to connects customers and products through the medium of powerful communication. Finelight has a bunch of advertisers, marketers, writers, designers, innovators with professional approach in communication.  Ã‚  Ã‚  Ã‚   The present buzz of IMC will continue as emphasis is laid on outgoing message in communication. Multinational companies by far have been very successful by implementing IMC as it covers the entire stratum of models of marketing. viz., (1) customer database (2) strategies (3) tactics or techniques (4) evaluation of results (5) completion of loop begin # 1 again.  Ã‚  Ã‚   Alternatively, 4P vs 4Cs   (1) Not product care for consumer (2) Not price, care for cost (3) Not place care for convenience (4) Not promotion care for communication. Discussion on theoretical framework   Information in technology times is immeasurably valuable and customer looks for information in every source and how to utilize and derive benefits in every sphere and stage of life. A heavy and reliable source of information is World Wide Web wherein bundles and scrolls of latest information is available for the benefit of customers. Whereas customer should be able to distinguish between a fake news and an acceptable facts of information. Bluenile.com sells diamonds and pearls online at a reasonable price and ships all over the world.   The company sends product news to its customers in order to take advantage of discount offers and also to entertain customers about its products.   Such email news provided to the customers is of great benefit and customers do not like to shop elsewhere as the customer service is perfect with bluenile.com.  Ã‚   The emphasis here is about the importance of   information and the respect that a customer receives from the company. Whereas there is every possibility for information that gets outdated within no time and information processing is very important for companies in order to keep the customers   updated about products.   World Wide Web entails global competition, quick communication and a constant thrive to stay ahead holding a distinct views and   facts not perceptions about marketing. Fleetboss is a leading developer and distributor of GPS-based fleet management systems. The company has been committed to excellent customer relations and marketing so much that a director has been exclusively appointed for marketing communications which includes media, dealers apart from internal and external communications.   Also directors develops advertising and sales promotions with vast professional experience. Methods    Understanding about customer mindset is the key for effective communication whether it is through Internet, direct selling or magazines, newspapers or mobile marketing. Consumers discard the information that is not important or useful on a day basis. Therefore marketing message must be selected, processed and tested on the following basis: Must be enabled of life experience that can be easily understood and receive the message and concept of communication. e.g. advertisements of deodorants (Axe), Garnier wrinkle lift and Cadbury chocolates. Customer must be related to the idea that is categorized. .e.g. Crack cream that is   useful for women for cracked heels or pain relief external applications for body pains. . Customer must get linked immediately to the communication that is already created in mindset. e.g. Ddamas gold and jewellery advertisement leaves an impact on the customer to search for and buy online. The presentation of message must be acceptable, justifiable and must convey appropriate message. Improper messages are bound to be ignored by the customer which is called as â€Å"judgment system†Ã‚   which means that consumers accept or discard information against what already has been judged to accept, adapt or reject the new material. Rejection of communication proves that sales promotion has been a failure. A marketer who presents non-integrated messages   have to ready to accept risks as the conflicts are bound to arise in the consumer’s information processing. Paypal.com uses mobile communication to send or receive payments from the customers which is directly helpful to customer saving time and easy to get access. No two customer’s taste or choice of purchase is similar with the fact if one customer purchases red roses on line, the other purchases cala lilly flowers. If one customer asks for AMEX card, the other applies for Mastercard.   Especially online identification of customers requires extra care, expert knowledge of human psychology and marketing communication techniques such that the words used on web should be influencing and effective to drive a customer to purchase when visiting web sites for products. Ebay is a globally successful company which is recording sales turnover increasingly as buyers are sellers are enabled to purchase goods online through the medium of auction and brand new sale of goods. World wide web enables electronic payment system, safe delivery of goods and security and encryption of credit cards and debit cards. Business directories, pop-up ads, banner advertisements on web sites, classified ads, search engines such as google, yahoo, overture, sify, rediffmail have been extensively useful in finding products of sale through which these companies have grown to a giant size in a span of less than a decade and still going strong with the growing customer base and innovative selling concepts still pending for testing. Amazon.com and BarnesNobles have a success story in sale of books where latest books are accessed by buyers and purchased. Access to libraries also is a source of cognitive and rationale thinking.  Ã‚   Marketing of products can be communicated through several means via the medium of Internet which is a powerful means of communication as millions are logging to Internet all over the world making www most affordable for online purchases of goods and materials. Literature review    World link Technologies is a broadband solution provider in the city of New York, serving medium and small sized business market providing high-speed data solutions. The company is based on a new business model   (ASPs) focusing only on customer’s needs.   In this world of ever changing of business and commerce, strategies of planning for marketing communication are always under recycling process for renewal of ideas in new millennium. According to an estimate an average American is exposed to 3,000 marketing messages daily via the medium of television, radio, billboard ads, logos on clothes and Internet banners. (Johnson 2001) . Consumer distrust also has increased with the scandals of WorldCom, Arthur Anderson and Enron which were highly reputed until investors were informed about the unethical marketing practices.  Ã‚   This has caused a great attention and a matter of severe concern for multinational companies to practice ethical marketing plans for greater attention of consumers. Emotional selling messages such as ‘soft-sell-approach’ instead of ‘hard-sell’ have been accepted.   PG Web Marketing 2001 launched a ‘seeding approach’ for marketing teeth-whitening product.   This approach considered by experts as a holy grail in twenty-first century marketing communication. ‘We live in interesting times’ – Maurice Levy and Dan O’Donoghue   and these interesting times must be turned to the advantage and benefit of companies as well customers and must not mis-utilised with an acceptable fact that technology, psychology of marketing must sell concepts and products instead of creating scams and scandals. Conclusion    Marketers who are taking the advantage of World Wide Web to market products must take social environments, changing business times and the psychology of a customer.   Consumers always change interests, ideas and choice of purchases. These must be considered coupled with holistic approach in marketing communication.  Ã‚   Internet has carved and shaped several successful multinationals through the medium of marketing communication and this will certainly witness a rapid progress apart from creating employment, selling and buying opportunities, commencement of SMEs   whereas a particular unique business models and marketing communication strategies must be worked out in order to become success on world wide web. References    Books Allen J. (2005) Marketing Communication: New approaches, Technologies,and styles Accessed 1 May 2007 Thomas C.O’Guinn, Christ T.Allen, Richard (2005) Advertising and integrated brand promotion Accessed on 1 May 2007 H.J.Heinz Company Worldwide guidelines Consumer education, Public relations, Marketing communications and Advertising Accessed 1 May 2007 http://www.heinz.com/Communications_guidelines.aspx Fleetboss appoints New Marketing Communications Director following a great success in 2003. Accessed 1 May 207    http://www.fleetboss.com/releases.asp?RELEASE_ID=31 Integrated Marketing Communication    Accessed 1 May 2007    http://www.entarga.com/mktgplan/imc.htm New Business model for ASPs – Marketing communication    Accessed 1 May 2007    http://findarticles.com/p/articles/mi_m0CMN/is_4_37/ai_62051114    Office of communication and marketing    Accessed 1 May2007    http://www.darden.virginia.edu/html/standard.aspx?menu_id=182id=4524

Pancreatitis: Causes and Symptoms

Pancreatitis: Causes and Symptoms Acute Pancreatitis Introduction Pancreatitis is inflammation of the pancreas. It is widely accepted that it is caused by pancreatic enzymes digesting their own gland. This leads to inflammation of the pancreas. There are two main forms of pancreatitis, acute and chronic. In acute pancreatitis the pancreas can usually heal itself without any lasting changes to function or structure of the gland. If the pancreas heals but then inflammation reoccurs intermittently and causes irreversible changes to structure and function then it is known as chronic pancreatitis (1). Pathophysiology The exact mechanism is not fully understood however it is believed that the initial events take place within the acinar cells of the pancreas. Injury of the acinar cells leads to an inflammatory reaction localized within the cells. If this inflammation is excessive it can lead to a systemic inflammatory response. The inflammatory process can cause systemic effects because of the presence of cytokines, such as bradykinins and phospholipase A. These cytokines may cause vasodilation, increase in vascular permeability, pain, and leukocyte accumulation in the vessel walls all leading to inflammation. Fat necrosis may also occur causing hypocalcaemia; and pancreatic B-cell injury leading to hyperglycemia (2). A marked systemic inflammatory reaction can lead to ‘distant organ damage and multiple organ dysfunction syndrome (MODS) (1). This is the primary cause of morbidity and mortality in acute pancreatitis. The disease progression can be seen in the following three steps: 1) Local inï ¬â€šammation of the pancreas, 2) A generalized inï ¬â€šammatory response, 3) Multi-organ dysfunction (1) When there is injury or disruption of the pancreatic acini pancreatic enzymes namely trypsin, chymotrypsin and elastase leak into the pancreatic tissue. These enzymes become activated and initiate autodigestion and lead to acute pancreatitis. The activated enzymes break down the pancreatic tissue and cell membranes which leads to oedema, and vascular damage which leads to hemorrhage and necrosis. Some patients who have had a severe attack of pancreatitis who survive through the initial event die following a rather minor insult that would not be life threatening normally. It is said that the two hit hypothesis comes in to play here. The initial excessive systemic inflammatory response primes the immune system so that if another event takes place (a small insult in comparison) for example a chest infection, the immune system is overwhelmed leading to an exaggerated inflammatory response which can lead to death (1). History and examination The main presentation of acute pancreatitis is epigastric pain or right upper quadrant pain radiating through to the back. In many patients sitting forward can relieve the pain a little. The patient would usually also complain of nausea, vomiting and fever. It is important to note a history of previous biliary colic and binge alcohol consumption. The patient may also be tachycardic, tachypneic, hypotensive and mildly jaundiced (2). Abdominal tenderness, distension, guarding, and rigidity are quite common as are diminished or absent bowel sounds. If the inflammation should spread to the lungs then basilar rales may be noted on auscultation of the lung. In severe cases Grey Turner or Cullens sign may also be noted (2). Aetiology There are many causes of pancreatitis. The most common causes being habitual chronic alcohol consumption and biliary stones. In western countries including the UK alcohol abuse is the most common cause of acute pancreatitis. A recent study showed that 44% of patients have alcohol as the primary risk factor for acute or chronic pancreatitis (3). Gall stones can cause pancreatitis as they may become wedged in the pancreatic duct or ampulla of Vater and obstruct the pancreatic duct, leading to release of enzymes into the parenchyma. Other less common causes include: injury (e.g. post ERCP), drugs (such as NSAIDS, azathioprine), viruses (e.g. mumps), autoimmune conditions (e.g. SLE), hyperlipidaemia, malignancy and Scorpion and snake bites (4). Investigations to be done if pancreatitis is suspected 1) Serum enzyme levels: Serum amylase in pancreatitis is more than four times the normal value and lipase is twice the normal and this is diagnostic as there is no other source other than the pancreas, but this test is not always available (5). 2) Full blood count, U+E, glucose, CRP: the CRP value is significantly lower in drug-induced acute pancreatitis and a raised bilirubin and serum aminotransferase is suggestive of gall stones. Low serum calcium levels are quite common in acute pancreatitis and hypocalcaemia is also relatively common. 3) Plain erect abdominal x-ray: this is done to exclude other causes of the symptoms such as intestinal obstruction or perforation. 4) Chest x-ray: this can show if there is a rise in one hemidiaphragm, acute respiratory distress syndrome or pleural effusions which can occur in severe cases of acute pancreatitis. 5) CT with contrast enhancement: this can be diagnostic if clinical results were inconclusive. CT may show swelling, fluid collection and change in the density of the gland. 6) Ultrasound: this is useful to see if the pancreas is swollen and if the common bile duct is dilated. It can also detect gallstones (5). Management In mild cases management is on a general medical ward. Analgesia is given to relieve the pain, usually with pethidine. Morphine is not usually used as it can have a spastic effect on the sphincter of Oddi (4). The patient is given intravenous fluids and not allowed to take anything my mouth. If the patient is vomiting severely then a nasogastic tube is considered. Oral fluids and solids can be taken once symptoms have cleared and blood tests are normal. The cause must then be treated, for example if gallstones were the cause then they must be removed. The severity of pancreatitis is determined by the Glasgow score or Ranson criteria which looks at patient demographics, electrolytes and enzyme levels on admission and 48 hours later (see 1) Glasgow prognostic score Ransons criteria * Age >55 years * WBC >15 x109/l * Urea >16mmol/l * Glucose >10mmol/l * pO2 * Albumin * Calcium * LDH >600 units/l * AST/ALT >200 units Present on admission: * Age >55 years * WBC >15 x109/l * Glucose >10mmol/l * LDH >600 units/l * SGOT >250 units/l Developing during first 48 hours: * Haematocrit fall 10% * Urea increase >8mg/dl * Serum Ca * Arterial O2 saturation * Base deficit >4meq/l * Estimated fluid sequestration >600ml In Severe cases the patent is treated in ITU. There is a high chance of multiple organ failure and infected pancreatic necrosis in these patients so if there is evidence to suggest this then intravenous antibiotics should be administered straight away. The patient should be fed via a nasogastric tube and where there are gallstones present and a high probability of a severe attack early ERCP should be done. Local Complications Pancreatic necrosis is likely if the CRP is rising and is confirmed by a CT scan. Infection occurs in 30-70% of cases of necrosis and this trebles the mortality risk. Fluid collections occurs in 30-50% of patients with acute pancreatitis but in most cases resolves spontaneously. Pancreatic abscess, acute pseudocysts and pancreatic ascites can also occur (6). Systemic complications These include pulmonary oedema, pleural effusions and ARDS with regards to the respiratory system and hypovolamenia and shock with regards to the cardiovascular system. Other complications include: disseminated intravascular coagulopathy, renal dysfunction, hypocalcaemia, hypomagnesaemia, hyperglycaemia and GI haemorrhage (6). Summary Acute pancreatitis is a disease in which there is inflammation of the pancreas. Acute abdominal pain and vomiting are the most common symptoms and increased serum concentrations of the enzymes amylase and lipase can confirm the diagnosis. Injury to the pancreas is mild in 80% of patients who recover well without complications. The rest have a more severe disease and present with local and systemic complications. Alcohol abuse and gall stones are the two most common causes of acute pancreatitis in adults and treatment of mild pancreatitis is supportive and more serious disease needs intervention from quite a few members of the multidisciplinary team (5). Improving the understanding of the pathophysiology and better investigation of the disease severity should improve the management and outcome of this compound disease (5). References Bhatia M,Wong FL, Cao Y, Lau HY, Huang J, Puneet P, Chevali L. Pathophysiology of acute pancreatitis. Pancreatology [online]. 2005; 5(2-3):132-44. [cited 2009 Dec 4] Available from: URL:http://www.ncbi.nlm.nih.gov/pubmed/15849484 Ghattas K, Samer S Deeba. Pancreatitis. E medicine [online]. 2009; [cited 2009 Nov 21]. Avalable from: URL: http://emedicine.medscape.com/article/775867-overview Whitcomb DC, Yadav D, Adam S, Hawes RH, Brand RE, Anderson MA, et al.Multicenter approach to recurrent acute and chronic pancreatitis in the United States: the North American Pancreatitis Study 2 (NAPS2).Pancreatology [online]. 2008; 8(4-5):520-31. [cited 2009 Dec 1] Available from: URL:http://www.medscape.com/medline/abstract/18765957 Longmore M, Wilkinson I, Turmezei T, Cheung CK. Oxford Handbook of Clinical Medicine (Oxford Handbooks Series) 6th edition. Oxford university press; 2008 Frossard JL, Steer ML, Pastor CM. Acute pancreatitis. The Lancet [online]. 2008; 12;371(9607):143-52. [ cited 2009 Nov 23] available from: URL: http://www.thelancet.com/journals/lancet/article/PIIS0140-6736(08)60107-5/abstract Willacy H, Kavanagh S. Acute Pancreatitis. Patient Plus UK [online]. 2008. [cited2009 Nov 29] Available from: URL: http://www.patient.co.uk/doctor/Acute-Pancreatitis.htm

Arrogance in Oedipus and Cocteaus Infernal Machine Essay -- compariso

Arrogance in Oedipus and Cocteau's Infernal Machine   Ã‚  Ã‚   The myth of Oedipus dates back centuries. Overtime a myth changes in many ways as each author or orator presents their own version. The main plot usually remains intact, but authors add their own style to the tragic story. In the case of Sophocles' Oedipus the King and Jean Cocteau's Infernal Machine both authors focus on the arrogant nature of Oedipus. Since this quality ultimately has destructive powers, the relationships Oedipus has with other characters demonstrates this arrogance. Although, the two authors portray Oedipus in different ways to emphasize their different themes both use the relationship between Oedipus and Teiresias to demonstrate Oedipus' arrogant nature. In both plays, this arrogance manifests in Oedipus' rejection of the prophet Teiresias. However, the two playwrights differ greatly in the relationship between these two characters. Cocteau's Oedipus immediately disrespects Teiresias' prophecy. This rejection of the prophecy and warnings of Teiresias emphasizes his theme of malevolent gods. Equivalently, in Sophocles' version of the myth, the denial of Teiresias demonstrates the main theme of the destructive nature of arrogance. Instead of the gods holding him back, Oedipus' own pride does not allow him to believe Teiresias. Oedipus believes that he is above everything and everyone. Just as in Cocteau, he even believes that he can defy the gods and disregard fate. In Sophocles version of the myth, the denial of Teiresias does not occur right instantly. At first, Oedipus regards the prophet Teiresias in the proper, respectful manner. Oedipus greets him by exclaiming, "My lord, in you alone we find a champion, in you alone one that can rescu... ...uture. They provide him with numerous hints regarding the impending doom that hangs in the atmosphere. However, Oedipus' arrogance blinds him to the truth of his situation and leads to his ultimate demise. Works Cited and Consulted Abrams, M. H. A Glossary of Literary Terms, 7th ed. New York: Harcourt Brace College Publishers, 1999. Benardete, Seth. â€Å"Sophocles’ Oedipus Tyrannus.† In Sophocles: A Collection of Critical Essays, edited by Thomas Woodard. Englewood Cliffs, NJ: Prentice-Hall, Inc., 1966. Cocteau, Jean. (1963). The Infernal Machine in The Infernal Machine and other plays. (A. Bermal, Trans.) New York: New Directions Publishing Corporation. Nagle, Brendan D.   The Ancient World: A Cultural and Social History. New Jersey: Prentice-Hall, 1979. Sophocles. (1991). Oedipus the King in Sophocles I. (G. David, Trans.) Chicago:University of Chicago Press.    Arrogance in Oedipus and Cocteau's Infernal Machine Essay -- compariso Arrogance in Oedipus and Cocteau's Infernal Machine   Ã‚  Ã‚   The myth of Oedipus dates back centuries. Overtime a myth changes in many ways as each author or orator presents their own version. The main plot usually remains intact, but authors add their own style to the tragic story. In the case of Sophocles' Oedipus the King and Jean Cocteau's Infernal Machine both authors focus on the arrogant nature of Oedipus. Since this quality ultimately has destructive powers, the relationships Oedipus has with other characters demonstrates this arrogance. Although, the two authors portray Oedipus in different ways to emphasize their different themes both use the relationship between Oedipus and Teiresias to demonstrate Oedipus' arrogant nature. In both plays, this arrogance manifests in Oedipus' rejection of the prophet Teiresias. However, the two playwrights differ greatly in the relationship between these two characters. Cocteau's Oedipus immediately disrespects Teiresias' prophecy. This rejection of the prophecy and warnings of Teiresias emphasizes his theme of malevolent gods. Equivalently, in Sophocles' version of the myth, the denial of Teiresias demonstrates the main theme of the destructive nature of arrogance. Instead of the gods holding him back, Oedipus' own pride does not allow him to believe Teiresias. Oedipus believes that he is above everything and everyone. Just as in Cocteau, he even believes that he can defy the gods and disregard fate. In Sophocles version of the myth, the denial of Teiresias does not occur right instantly. At first, Oedipus regards the prophet Teiresias in the proper, respectful manner. Oedipus greets him by exclaiming, "My lord, in you alone we find a champion, in you alone one that can rescu... ...uture. They provide him with numerous hints regarding the impending doom that hangs in the atmosphere. However, Oedipus' arrogance blinds him to the truth of his situation and leads to his ultimate demise. Works Cited and Consulted Abrams, M. H. A Glossary of Literary Terms, 7th ed. New York: Harcourt Brace College Publishers, 1999. Benardete, Seth. â€Å"Sophocles’ Oedipus Tyrannus.† In Sophocles: A Collection of Critical Essays, edited by Thomas Woodard. Englewood Cliffs, NJ: Prentice-Hall, Inc., 1966. Cocteau, Jean. (1963). The Infernal Machine in The Infernal Machine and other plays. (A. Bermal, Trans.) New York: New Directions Publishing Corporation. Nagle, Brendan D.   The Ancient World: A Cultural and Social History. New Jersey: Prentice-Hall, 1979. Sophocles. (1991). Oedipus the King in Sophocles I. (G. David, Trans.) Chicago:University of Chicago Press.   

Overpopulation Causes Social Problems Essay -- Cause Effect Environmen

How Overpopulation Causes Social Problems Introduction   Ã‚  Ã‚  Ã‚  Ã‚   The purpose of this paper is to demonstrate how overpopulation causes social problems. To do so you must take many things into consideration, such as different views of racial problems and conflicting definitions of a social problem. Social problems can be defined in many different ways. They effect everyone and some of us encounter problems everyday as a result of our race, religion, gender, or low income. Others experience problems from technological change or declining neighborhoods, others are affected directly by crime and violence in their own neighborhood, and sometimes definitions of social problems are changed by society because of changes around you. Finally in order to achieve the purpose of this which is to examine and discuss different issues and situations that cause social problems such as poverty. Overpopulation and social problems go hand and hand in today’s society and there are many reasons and factors as to why these problems exist. Factors that lead to overpopulation that causes social problems are the increase in the number of single mothers in poor neighborhoods opposed to the decline in birth rates in the more efficient parts of the country, how the death rate is at a steady decline because of medical advances in rich and poor countries, the effects immigrants have on an environment and the population growth that occurs, the influence parents leave on children, and what is being done to help prevent the spread of AIDS because this is a deadly disease which is lowering our population but causing many social problems. Elements of a Social Problem There are also elements that make up a social problem. One of these elements is that â€Å"they cause physical or mental damage to individuals or society† (Carter p16) which means that sometimes people may permanently suffer before any action is taken to solve the problem because everybody thought it was not that big of a deal until sometimes permanent or short term damage has occurred. Another element is †they offend the values or standards of some powerful segment of society† (Carter p16) which means no matter what you do someone will always take offense against your actions because everyone has different views and values and what is important to some may not be to others. Another element is that â€Å"they persist for an ... ... is always a good future ahead and sometimes it is not always the parents blame. I also asked her opinion of the topic of my paper and if she thinks overpopulation is the main reason for social problems. She said that social problems are caused by many factors not just one and from her experience that in inner city areas where the population is higher there seem to be more problems that exist compared to an urban neighborhood where the population is lower. Conclusion In Conclusion social problems will always exist because social problems change as time changes. We often tend to overlook what we call necessities others call luxuries. Therefore in the future I hope social problems will become non-existent but that is pretty much impossible. I also feel that poverty is a huge problem we face as a world and that even though it is impossible to solve this problem, we must look at it as an ongoing problem and do our best to help solve this problem. In final I feel that overpopulation with a couple other factors such as diseases, young pregnancies, and the one that I think has the most importance is the environment you grow up in helps shape you into the person you grow up to be.

How Is Conflict Presented in Bayonet Charg Essay

Conflict often has harmful effects, including causing death and destruction, so it is usually viewed negatively. However, conflict can also bring out positive traits in people, and the people involved in it may be respected. â€Å"Bayonet Charge† imagines a soldier’s experience in battle. â€Å"The Charge of The Light Brigade† recounts the story of the charge made by the Light Brigade in the Battle of Balaclava. Language One way conflicted is presented in â€Å"Bayonet Charge† is through the use of language. The language used, portrays the soldier and his actions/movements. Ted Hughes uses sibilance to portray the soldier’s actions as well as feelings. For example, â€Å"raw-seamed hot khaki, his sweat heavy Stumbling†¦Ã¢â‚¬  The use of sibilance here mimics the squelching mud. The repetitive‘s’ sounds recreates an image of the soldier walking through mud. The word ‘khaki’ suggests that the person being described is a soldier as it is normally associated with the military uniforms. The word ‘heavy’ suggests that the soldier is uncomfortable and his movements are unnatural. The word ‘stumbling’ suggests that the soldier is disoriented and could also suggest that his movements are clumsy. Another way language is used to present conflict is through the use of similes. For example, â€Å"Sweating like molten iron from the centre of his chest†. The phrase ‘molten iron’ suggests a burning, abject terror at the heart of his being. On the other hand, â€Å"The Charge of the Light Brigade† uses metaphors such as â€Å"Valley of Death† to present conflict. This phrase forebodes the charge as it makes it sound certain that the soldiers are going to die. It also suggests the commander has made a mistake as he has sent them into the ‘valley of death’. This makes the soldiers more courageous as they are marching into their own deaths. It also creates the allusion to psalm, where faith instils courage in the face of death. Another way language is used to present conflict is through the use of rhetorical questions. For example, â€Å"was there a man dismay’d?† The rhetorical question implies unequivocal bravery and shows the gallant nature of the men. It shows that they were used to obeying orders and leaving the thinking to their generals. Structure/Form The form and the structure of the poems also plays a part in getting the message across to the reader. â€Å"The Charge of the Light Brigade† has a clear and powerful rhythm and rhyme scheme that suggest the energy of the battle. The Light Brigade’s determined gallop towards its destruction is emphasised, by repetition, from the first two lines of the first stanza of the poem: â€Å"Half a league, half a league,/ Half a league onward†¦Ã¢â‚¬  Once the order has been given, the fate of the men was sealed – they had no choice but to follow their terrible destiny to its conclusion. The weapons they faced are also repeated, sometimes with slight variations, for example, â€Å"Cannon to the right of them, / Cannon to the left of them,† to emphasise the danger faced by the cavalry and their great bravery. Repetition creates a sense of impatience to enter battle and bravery in the face of danger. Alfred Tennyson uses dactylic trimester to mimicking the stea dy galloping of their horses. The stresses also create a â€Å"falling rhythm† which symbolises the soldiers who will fall. The poet has written the poem in 6 irregular lined stanzas. This could be to show the unpredictability of war. The word â€Å"Cannons† has been used as an anaphora for three lines which emphasises the fact soldiers are surrounded and can’t escape. The sheer amount of cannons blocks their vision therefore suggesting they couldn’t anticipate the attack. The form of the poem is a narrative story. This is because the poet is describing the attack to his audience. â€Å"Bayonet Charge† uses onomatopoeia, alliteration and assonance and the senses to bring the images described to life. â€Å"Stumbling across†¦Ã¢â‚¬  is an awkward line to read, which evokes the sensation of running across a muddy field. The use of enjambment throughout the poem quickens the pace and emphasises urgency and unpredictability of war. The use of medial caesuras achieves a variety of effects, from reflecting the soldier’s tiredness to deliberately making the action feel like slow motion. The use of iambic pentameter in some lines helps the poems flow and recreates a heartbeat

A Positive Approach to the Future

A Positive Approach Towards the Future The issue of mandatory school uniforms has taken on several debates over the past decade; it is believed that this issue will plague public schools for decades to come. Students who wear uniforms feel a sense of being superior with their fellow classmates. This feeling of being part of a group boosts morale and individual confidence, thus leading to higher grades. Children will be more focused in a uniform classroom. There is no more distraction as to what the other kids are wearing or who has the name brand shoes. Girls will be dressed appropriately and clothing will fit properly. This adds to the learning experience. There is no more competition. There is no more rivalry and the children are able to focus on their schoolwork and not on the latest trends ( Bodine 67-69). Former President Clinton made a state of the union address in 1996; in that address, the subject of mandatory school uniforms was mentioned. â€Å"If it means that teenagers will stop killing each other over designer jackets, then our public schools should be able to require their students to wear uniforms† (Williams). In fact, that year in Long Beach, California, the first district to implement mandatory uniform policies, assault dropped by sixty-seven percent, vandalism by eighty-two percent, and robbery by thirty-five percent. Overall crime was reduced by seventy-three percent the first year the policy was in place (Williams). This was a direct reflection of the uniform policy. Students were more disciplined and behaved in a more mature manner. These students took pride in themselves and others. With the lack of material items to fight over, students no longer felt the need to use aggression towards others, proving that school uniforms do in fact improve student behavior. Also when it comes to crime, a student wearing a school logo, is less apt to commit a crime outside of school while in uniform because it would be easier to track him based off of the school information on the uniform? This lowers the crime rate for the general public as well as the in school instances. Not only do mandatory uniform policies for public schools offer the potential for higher educational benefits and improved student discipline, school uniforms dissolve social boundaries between classmates. Students are no longer judged based off their appearance but by who they are on the inside. There is no more competition between social classes that these students may have otherwise felt and they work together as a team and share a common pride. All students will feel a sense of belonging. No longer will lower income children be labeled as poor based off of their clothing. All children will appear as equals in the classroom and will be treated as such. However, some may argue that uniformity takes away from the student's individuality. Many children, especially teens, express themselves through their personal styles and the way they dress. Sometimes children need to feel special or unique and dressing a certain way is how they accomplish this. Uniformity takes away from the First Amendment by taking away freedom of expression. If we take away the freedom of expression, we are taking away our children's creativity and conforming them into a society where free thinking is not accepted. However this is not the case. The uniform does not change who the child is on the inside or how he thinks creatively. Students will still be able to focus creative energy through activities such as art, music, writing or sports. There are several creative outlets besides the choice of clothing options. When it comes to our economy, we as Americans must pinch our pennies where we can. Many parents are faced with the dilemma of outfitting their children in the latest trends or putting money towards more important things like saving for their children's college education. Some families are unable to afford the popular named brand clothing that their children desires, which make the children, feel inadequate in school when they are forced to wear lesser brand clothes or second hand outfits. School uniforms would take away that hassle of finding bargains to ensure that their children feel confident in their attire. Uniforms are generally more durable than the average street clothes. Granted, the cost may be a bit more substantial in the beginning, but the uniforms will last longer which means there is less out of pocket expense for replacement articles. With uniforms, the parents may only have to purchase two or three sets compared to several pairs of bottoms and tops. Uniforms are more durable and can be washed more frequently compared to regular clothes. This makes them the better option not only for lower income families, but all families in general (Romero C4+). Critics claim that uniforms will cost the families more money in the long run because parents will be forced to buy the uniforms and regular clothing for their children to wear when they are not in school. The cost for parents may double that of just buying traditional school clothes. Although this is partly true, that yes, parents will be faced to make additional purchases for their children, in reality, they really won't be spending that much more money if any. Since uniforms are more durable, the parents only need to buy a limited supply and since the children will only be wearing their regular clothes outside of school, parents will not have to buy as many outfits. Most children wear out their clothes while in school. Since this is not an issue with the uniforms, the traditional street clothes will last longer, hence saving the parents money in the long run. Also without the constant competition in schools, children may not feel the need to have the latest brands and styles as they would if they were wearing the clothes to school on a daily basis around other social classes (King 3-5). With all of the advantages and disadvantages of implementing mandatory uniform wear into our public schools, there needs to be a compromise. Some schools have decided that it is best to make minor changes to the dress code policy. When it comes to school uniforms, there is a never-ending debate as to what the right approach and the wrong approach may be for our public schools. Works Cited Bodine,A.. aâ‚ ¬? School uniforms, academic achievement, and uses of researchaâ‚ ¬?. The Journal ofEducational Research 19 Feb. 2008: 67-73. Print. King, K. A. Should school uniforms be mandated in elementary school?. 2010: 3+. Print. Romero, E. aâ‚ ¬? School uniform countdownaâ‚ ¬?. Daily News Record, 16 Aug. 1999, C2+. Print. Williams, D. aâ‚ ¬? School uniforms: The raging debateaâ‚ ¬?. n. d. Web. 5 Aug. 2011.

Family is losing its functions Essay

Using material from Item 2B and elsewhere assess the view that, in today’s society the family is losing its functions. As stated in Item 2B, the family fulfils a number of important functions for individuals and for society, such as the socialisation of children and the stabilisation of adult personalities. However, some sociologists suggest that, in today’s society, the family is losing its importance as these functions are being taken over by other institutions; for example, nurseries have an increasingly important role in the socialisation of young children whose parents are working full-time. Functionalists see the family as a particularly important sub-system; they believe that the nuclear family is a key institution as it meets basic needs. Murdock (1949) argues that the family performs four essential functions to meet the needs of society and its members. Firstly, they offer economic support to provide the children with all the fundamental necessities they requir e in life e.g. food, shelter and water. They too give a stable satisfaction of the sex drive with the same partner, making their partner feel more safe and secure, as well as reducing the chances of getting STDs. Another purpose is reproduction of the next generation, without which society could not continue. Further to this, it also provides the child with 2 role models and so, they will feel more safeguarded of having both parents. Lastly, it socialises the young into society’s shared norms and values- without this, society would suffer from negative impacts e.g. feral children. A criticism to Murdock’s study is that it is out-dated, many sociologists argue that society has now changed and these functions can be performed equally well by other institutions, or by non-nuclear family structures. Marxists and Feminists reject his ‘rose-tinted’ consensus view that the family meets the needs of both wider society and all the members of the family. They argue that functionalists don’t review exploitation and conflict within society. Marxists argue that the family maintains class inequality and capitalism and so, the functions of the family are performed purely for the benefit of the capitalist system. They do not see the nuclear family in the same way as functionalists and believe that they ignore the ‘dark side’

Post-war inequalities in British health and education Essay

Poverty or low disposable income often results in an inadequate environment and not only for the obvious lack of resources such as books, pens and paper. Damp housing can have severe effects on health resulting in lower school attendance rates, or low concentration levels if child is often feeling unwell. Not having an allocated area to study is also an important factor. Kellet and Dar (2007) discovered that in low income areas where housing was cramped, children claimed that ‘Television was a distraction from homework because of the noise†¦ Other distractions in the home environment were smoking, swearing, banging and loud music. ‘ Also that homework clubs were vital to the success of children from disadvantaged families. This study was performed by children, with the guidance and research techniques of sociologists, there for it is perceived as having a deeper and more honest insight in to children’s issues. Other class factors resulting in underachievement may be less obvious. Values differ between class perspectives and affect a child’s motivation. Bowes et al (1990, p119) states that working class children are more likely to leave school as soon as they can, to find a steady job. ‘ Where as the middle class value differed gratification and ‘Socialise their children in to wanting to remain in education in the hope of a better job when they do leave. ‘ This was confirmed by the Child Development survey, which found middle class students staying on at school and achieving better examination results. The Home and The school study (1964) found that ‘the degree of parent’s interest in their children’s education was the single, most important factor affecting attainment. ‘ (Haralambos et al, 2004, p102). It found that ‘Middle class parents visited school more†¦ and were generally more interested in their child’s education. ‘ It also states that ‘an upper middle class child was five times more likely to get in to grammar school than a child from the lower working class. ‘ Further more ‘most of the working class pupils who were successful, came from homes where the mothers were â€Å"sunken middle class. † They wanted their children to do well and ‘expressed much parental interest,’ Bowes et al (1990, p119). This is because parental interest not only has a direct affect on the motivations and values of a child, but also on the school environment. Middle class parents, who often have more spare time and disposable income to invest in fundraising and extra curricular activities, can raise the standards of a school immeasurably. Making school a fun place to be, that is enjoyed by all the family, creates the positive learning environment that children thrive in. Quite understandably most working class parents are to busy â€Å"earning a crust† to find the time and energy to invest in such endeavors and as such adopt an â€Å"Education is the schools job† attitude. It is also understood that language has had a negative affect on the working class’s academic attainment. Professor Basil Bernstein has shown that the middle and lower classes use different patterns of speech. He called these patterns linguistic codes. According to Bernstein, most middle class children have been socialised in both restricted and elaborate codes, and are fluent in each. Whereas working class children are limited to the restricted code. Since teachers tend to be middle class and use the elaborate code, working class pupils are placed at a distinct disadvantage. There is also explanation for underachievement to be found in the â€Å"hidden curriculum† of a working class teacher, that is the subliminal messages he passes to children without intention. The cultural depravation theory states that children in the bottom classes are ‘deprived of important values, attitudes, experiences and skills which are essential to educational success,’ (Haralambos et al, 2004, p102). This has been strongly criticised and there is evidence that if class differences in culture exist, they are slight and of little significance.

Biochemistry and Technology Essay

What specific topic did you choose to research and evaluate? (2 points) -I chose genetic engineering/recombinant DNA technology/transgenesis of biotechnology to research and evaluate because that interests me the most, personally. List the resources that you used in your research of your topic. (3 points) – I used sites such as, wikipedia.org, and slideshare.net. Describe, in a few paragraphs, the biotechnology that you researched. How is it currently being used and/or what are the hopes for its use in the future? (10 points) -Genetic engineering is an area in biotechnology that induces cell alterations in any kind of organism. It is based on artificial manipulation and transfer of genetic material from one organism to another. Basically the cells coded in with the new genetic information will pass those selected traits on to their offspring. Genetic combinations might be useful but not often found in nature. Genetic engineering now a days, is used in medicine to produce insulin and growth hormones, for those who lack it. The genes in humans are isolated using enzymes produced by bacteria which cleave DNA at specific base pairs, and then inserted into a a virus. The virus then is inserted into the bacteria DNA, ten the bacteria produces the hormones, which are then collected and given to patients who most need them. The hope for genetic engineering is soon a cure can be found for diseases by either inserting a corrected gene or even performing a genetic surgery. Currently many pregnant women like to have the fetuses screened for genetic defects so it can allow them and there physician to prepare for the arrival of the child who may need to have special needs. Describe the positive aspects of this biotechnology, being as specific as possible. (5 points) -One possible benefit for genetic engineering is is that with gene therapy, a fetus a genetic defect could be treated and even cured before it is born. Specific traits or characteristics can be inserted in a species, for example pest resistant genes inserted into crops to enable more crops to be harvested. Artificially produce vital hormones or proteins that are essential by inserting the coding genes into bacteria cells.†¨ Describe the negative aspects of this biotechnology, being as specific as possible. (5 points) -Genetic pollution occurs where the artificially produced species reproduce at a higher rate compared to the wild species present and cause extinction. Species that are produced have side effects such as a short life span, prone to diseases and mutations and physical defects. Expensive and advance technologies need to produce and maintain genetically engineered species. Hybrid species created may harbor new statins of diseases or viruses that is produced from the altered genes. Based on your research, what is your conclusion about whether or not this biotechnology should be used? Be sure to explain your answer. (5 points) In my opinion, I think biotechnology can benefit us all in a lot of different ways, but only if we use it right and only if we are really in need of it. For example, I think genetic engineering could help actually save a lot of lives and troubles that one might have when born. If treated right, a disease or disorder can be cured before one is born.

SUBWAY Restaurants in Middle east Research Paper

SUBWAY Restaurants in Middle east - Research Paper Example This ensures that an organization captures a significant consumer population thus enhancing and increasing sales and increases profit levels. Additionally, retaining a large profit margin is important in the global market. An organization should ensure that it generates enough funds to support an organization’s operations (Fujimoto & Shiozawa 37). In the global market, an organization requires enough funds to fund factors like advertising and marketing. For instance, marketing in the international market is an expensive venture which needs a steady flow of income at great margins (Fujimoto & Shiozawa 32). If the income level is poorly managed funding marketing projects would fail which would reduce an organization’s exposure to the consumer market. This would automatically reduce the income levels and may lead to the exit from the global market. Fujimoto & Shiozawa point out that stability; relevance and effective management are the three factors an organization in the global market needs to have in order to gain from the vast global market (66). For instance, Subway restaurant has a lot of competitors in the Middle East. For this reason, the organization should ensure the local consumers appreciate and recognize their international entity. However, it is an obvious assumption that international restaurant ventures in the Middle East have a great consumer attention level which creates a fair level of competition in the international organizations in the venture. Fujimoto & Shiozawa however, argue that an organization can easily manage their consumer appraisal level by generating a target over a certain period of time (55). This would make it simpler to manage and generate strategies to enhance stability of the organization in the global market. The industry analysis Intensity of rivalry With the numerous technological advancements in the Middle East, the location has attracted numerous investors and international market. This has increased the lev el of competition in the market and increased caution by organizations venturing in the market. In terms of restaurants and hoteliers the level of competition is much greater (Fujimoto & Shiozawa 43). The Middle East has become a top hub for tourists. This attracts the investments of many stakeholders in the hotel industry. Regardless of the many organizations, the industry generates large profit returns (Fujimoto & Shiozawa 44). This eases the intensity of the rivalry since the quantity of consumers is enough to support most of the hotel ventures. In the case of subway restaurants, the organization is limited in terms of offers given to the consumers. Additionally, this limits their exposure. Many organizations in the Middle East offer the same services with an aim of acquiring the same profit returns as the Subway restaurant. Substitute The Middle East provides a great number of substitutes in the hotel industry which makes it an important factor to consider effective competitive strategies. Top restaurant ventures across the globe such as McDonalds, Dorman’s, Costa Coffee and the local organizations create a large variety of substitutes in the market. Additionally, the consumers in this particular market hold each of the organizations with same sensitivity and significance. This likely puts every organization in t

Why markets generally fail to achieve social efficiency Essay

Why markets generally fail to achieve social efficiency - Essay Example On the other hand, if the marginal cost to society exceeds the marginal benefit, then the social efficiency is low in that case. Whereas, when MSC and MSB are equal, it is referred to be at an optimum level (Suneja, pp.147, 2000). It is very difficult to achieve social efficiency and real markets fail to accomplish it because their marginal social costs do not equal the marginal social benefits. There are a number of reasons behind market failure. Externalities: â€Å"A market is not likely to lead to market efficiency if the deeds of the producers or consumers affect people other than themselves† (Sloman & Sutcliffe, pp.430, 2004). Externalities occur when society fails to make adequate compensation for the production of goods and services as well as for the consumption of these products. This is attributable to the ‘spillover effect’ this leads. Since the pricing system does not account for the marginal social costs and benefits that are attached to the compensa tion of these products, externalities exist, which may often lead to market failure. Social cost is the addition of private cost and the externalities. Let us take an example of a chemical industry. If a chemical industry release by products into a river or atmosphere, it is creating negative externalities that

Renewable Energy Essay Example | Topics and Well Written Essays - 500 words - 3

Renewable Energy - Essay Example le published in How to Power the World, â€Å"the waste products of nuclear power contain â€Å"high levels of radioactive (materials which) is very dangerous. It lasts for tens of thousands of years before decaying to safe levels. It is highly radioactive and is probably the biggest hurdle we face if nuclear power is going to be taken seriously† (How to Power the World 2010). Nuclear energy has great potentials to augment sources of energy in the future. It use, however, should be further evaluated in terms its long term effect to the environment and the risks it poses to the existence of mankind. Another article entitled An Ocean Breeze: Mapping Brazil’s Offshore Wind Power Potential written by Riebeek (2009) proffered his experience on â€Å"assessing the feasibility of an offshore wind farm southeast of Brazil† (Riebeek, 2009, par. 1). His project entailed measuring wind speeds using Nasa’s QuikScat. The limitations of using this approach coupled with other challenges including the number of turbines that must be built in their projected location showed that although this source of renewable energy is viable in Brazil, there are other factors that need to be seriously evaluated prior to its implementation. The high investment cost proved to be a barrier for implementation as private or public organizations need to examine if the returns on investment would justify the initial funds needed to support and sustain this energy source. among all of its potential applications, hydrogens only waste or byproduct is H 2 O pure water, hydrogen fueled combustion engines actually clean the air they pass through (Alternative Energy, n.d., par. 3) it is costly to produce, dangerous to store, difficult to transport, tricky to distribute and its volumetric energy intensity is much lower than that of other liquid fuels like ethanol or gasoline. Safety would be another problem and it would be an enormous job, and would take many years, to accomplish the logistics and

Theories and Methods in Media Studies Essay Example | Topics and Well Written Essays - 1000 words

Theories and Methods in Media Studies - Essay Example With this underlying root, Mark Zuckerberg along with his roommates back in college found the social networking Company and named it Facebook, Inc. in 2004. Students of the Harvard University and some of the American universities were at first restricted from using the online social networking service. Later, with a mounting demand from students and the public, the social medium of communication and network named Facebook spread all over the world (Miller, 2011). Facebook has gained such massive popularity mainly because it brings together people from different countries, territories, learning institutions, races, gender, and religion on a common platform. The underlying theories of social media, social networking, virtual mode of communication, and digital marketing highlight the fundamental purpose and implications of Facebook. The social networking site allows the users to create, exchange and share ideas, data, and information via online and virtual communication platforms. The s ocial network leverage advantage of the advancements of technology together with its anticipated benefits via the World Wide Web or internet. Due to various benefits that have resulted from use of Facebook and other social networking services, the people, organizations, and community groups increasingly consume products and services of social media. The social media of networking has allowed the people to remain in touch with their friends irrespective of the distance that sets them apart. The formation of communities by the people who share similar thoughts, opinions, profession or likings have helped the users to remain together and connected on a continuous basis. The social media and the networking services are being used worldwide and widely accepted by the people in different communities. For this reasons, the social media and networking sites could also be used to form public opinions in case of social issues. Apart from the people and the communities, the business houses and several organizations have also started to accept the networking services of social media like Facebook and Twitter among others to take advantages of the virtual platform and digital marketing opportunities. The social media and other virtual platforms for networking have been proven more advantageous relative to the conventional electronic and the print media. The worth of communication, the extent to which the information can reach users, the immediacy of the communication achieved by the online medium of communication helps to attain an improved performance of networking. These advantages of digital communication with the help of internet-based services using various applications are useful for marketing of products and services by the companies. The information of the product and service could be spread to a wide range of target customers in order to complete the marketing activities at optimal cost. The shift in the trend of marketing and selling of products of the companies in various sectors of the industry have been largely due to the changes in the way of communication of the society and the inclination of communication and information exchange through the online social media. The uses of social media like Facebook, Twitter, etc. by the companies on an increasing scale are being observed to tap the potential opportunities in the changing market scenario (Ryan, 2011). The applications of the social