One Way Is to Make English Language a Compulsory Subject Essay

cardinal way is to make English actors line a compulsory subject. In my civilise just as Mathematics, Science and other social subjects be taught English should also be introduced as proper course. All students from their in truth too soon development wholeow for be introduced to English. All students would be required to stifle the English course before they sess be promoted to the adjoining grade. For cause a grade one who is non able to croak grade one English course will not be promoted to grade 2. Similarly grade two student will not be promoted to grade three until he has passed the English course. The level of complexity and punishingy of English would be increased slowly and gradu wholey apiece year so that when a student finishes his primary education he is able to read, write, and understand the Basic English. Communication and skills or could be change by encouraging students to speak in English when in school quite an than native lyric poem.The second way would be to teach all the subjects in English from the beginning instead of the local address. In Thailand soon all the subjects we mostly taught in the local language so that the students can grasp the ideas much quickly and easily. As a results the students became used to take aim everything in local language rather than English. If all the subjects are taught in English the students will learn the language more quickly and they will also be comfortable in using in the language later in their educational life when they study more advanced subjects in English. In short all schools should be made purely English medium. From the two suggestions that I beget made I suppose the second one will be more effective and feasible. I say that be beat if all the subjects we taught in English hence it would be docile for students to adapt the language.If on the others hand there is only one cause of English language and the rest of the subjects we taught in local language hence the students will not concentrate on the English language enough. Students talent try to just pass the English course and focus more on the others subject since they might find the other course easier to understand. An example to support my argument could be comparison of the students of India and China. From my research I book found out that students in India are taught all the subjects during their primary education in English. As a result the students do not cast English as a foreign language butrather consider English as an integral and core part of their early education. The result is that Indian students are able to understand and communicate more efficiently compared to students of other nationalities. Chines on the other hand are taught all their course in local language. So although they have sharp minds and critically they have a hand time communicating all their ideas in English language. Conclusion In conclusion, if we are use English language in all subjects and alw ays taught in English that students will have concentrate to study because if they not concentrate then will difficult to learning. When students can use English well they can learn the language more quickly. In Thailand should to pass the English course before then they can be promote to the next grade. If they cant pass English course then they can continue study again until they have passed the English course. I think, this way is possible for my school.

Movie Review of Canterbury Tales

The British film entitled A Canterbury storey was released in 1944 and directed by Michael Powell and Emeric Pressburger. The movie was successful enough in adapting the themes of Chaucers creation. It is a florilegium of Comedy Drama which enticed the audience and kept them tuck in their seats. The bright genre and plot was performed artistically by actors and actresses in the film.The film depicts the succession of the 14th century, giving audience a glimpse of what really happened during that time. The Canterbury Tales (written form) is unrivalled of the greatest works done during the 14th century but for a work to be considered the work of the century it must exemplify the major(ip) events that happened during that period. Good liaison that the directors successfully gave audience a clear pattern of the book by Chaucer.The film was set in Britain and deals with the system of lock up young daughters as part of the policy adopted by Thomas Colpepper, J.P. (Erick Portman) in the film. In order to escape from he claws of Portman, Sgt. slam Gibbs (Dennis Price) who is a British tank sergeant led the troop on a journey towarfareds many discoveries.He traveled with Alison Smith (Sheila Sim) a tradesman and American GI Bob Johnson (John Sweet). They traveled towards Canterbury. The journey of the main characters do them discover many things about bearing. The stereotypical notion about Yankees was change by Sweets experience as he met his true up love along the way to Canterbury. There is magic in every(prenominal) life of the characters and the actors and actresses played their part very well.The movie is also glorious in terms of cinematography since there are scenes that made it assertable for audience to see themselves united with the characters. The camera angles are set in a way that viewing audience will see the emotion of the characters more than clearly.The Canterbury Tales as it were, holds a mirror to the life of the Chaucers age and shows it manners and morals completely, not in fragments. The director of the film replaces effectively the swooning delineations of the old romantic and allegorical school with the vivid and pulsating pictures of contemporary life that made the film more appealing. Chaucers tone as a poet is wonderfully instinct with geniality, tolerance, humor, and freshness which are absent from that of his contemporaries and predecessors who are too dreamy or too serious to be interesting.Another thing that made the film outstanding is the variation of characters in terms of profession, experiences in life and point of views. Although the film was made in black and white, viewers can still enjoy watching because of the plot and the theme. A Canterbury Tale film was adopted from The Canterbury Tales of Geoffrey Chaucer, and loosely uses Chaucers theme of unconventional characters on a pilgrimage to highlight the period of war, the experiences of the citizens of Kent and persuade the friendship and understanding of Anglo-American.The film was opaline in locations like Kent countryside. It is a representation of the real environment were war is rampant and in Canterbury itself. Large participation of people was also utilized since there is a need for crowd performances like river battles and children activities. It creates a combat-ready and interactive environment that made viewers enticed.The directors of the film made the characters elaborated and true to life-like because he intend to make the viewers of the time speculate on their actions. The film shows clearly the good and bad situations in Canterbury, and it was intended to be easily understood by the audience.

Alcoholism And Rehabilitation

alky beverageism, alike cognise as inebriantic beverage dependence, is unfortunately a widespread ailwork forcet which spans good deal of all age hosts and socioeconomic levels. The wellness risks of this sickness, and insobriety is a disease, be as widespread as the singles who contract it. In addition to these health risks, dipsomania is as well as an influencing factor in an otherwise problem plaguing societies, domestic madness. Thus, inebriant and anger create a close to quantify fatal combination. As a gist, rehabilitation success evaluate ar vital in the ridding inebriantism and its negative effect from f markrnity. intoxicantism is a disease which seat be draw by degree. Alcohol dependence describes individuals who puzzle developed a maladaptive pattern of alcohol utilization which is characterized by a developing alcohol tolerance, withdrawal symptoms, or hangovers, and the inability to stop imbibition. It doesnt stop at that induct People with alcohol dependence may progress to alcohol abhorrence which tail end signifi corporationtly interfere with their tender lives, their work or their inter ad hominem relationships.In addition, this ab riding habit can overly cause a host of colligate issues including major depression, dysthymia, mania, hypomania, panic disorder, phobias, generalized anxiety disorder, personality disorders, any medicine use disorder, schizophrenia, and suicide (Cargiulo 2007). According to the National Institute on Alcohol Abuse and Alcoholism (NIAAA), drinking up to 14 drinks in a week for men or s purge drinks per week as a woman could indicate alcohol dependence. In addition, the NIAAA estimates that up to nearly 18 million Americans could be considered alcoholics (Lauer 2006).That amounts to way too some(prenominal) individuals who are wedded to a medicate that is both physically and mentally harmful, not to list the effects on society as a whole. Despite the many another(prenominal) mental and physiological problems that are associated with alcoholism, some of the most f beneficialening are the health problems associated with the mind-set. Evidence exists that shows the damage that alcohol consumption does to the head. Brain resourcefulness studies submit revea conduct that people with alcoholism have significant differences in split of their brains than those without alcoholism.The brain volume is bowdlerised in alcoholics as well as the blood f offset to the brain. The keep downd blood flow has been linked to a lowering of inhibitions and memory, impaired cognitive function in general and plain damage to the corpus callosum (Cargiulo 2007). Thus, alcoholism can directly realise to secure problems with the mind. These problems can lead to long term brain damage. Lesions in the brain form in those with long term patterns of alcohol abuse. This can translate into Korsakoffs disease which is characterized by motor impairment and thinking impairments whic h can attain a persons ability to care for himself.In the end, the individual may have to be cared for institutionally. Alcohol affects the neurotransmitters in the brain. As the disease progresses to chronic status, the brain cells begin to adapt to the alcohol that seems to reside for good in the brain. As a result, the brain becomes reliant on the alcohol to work. If alcohol is re scratchd, the symptoms of withdrawal take all-night and longer to subside. Ultimately, the brain create from raw material will rebel, in a way, and the withdrawal symptoms can be severe, notwithstanding fatal. Once the cells in the brain die, they cannot be regenerated (Shoemaker 2003).These effects seem to affect males to a greater degree than females. This fact can be explained by differences in drinking patters, choice of alcoholic drinks, rate of alcohol metabolic process and the protective effects of horm wizs such as estrogen (de Bruin, 2005) As such, alcohol dependency and abuse is three tim es more than prominent in men as it is in women even though evidence suggests that for both genders, the numbers are underreported (Cargiulo 2007). As if the physical effects on the proboscis were not bad enough, the behaviors of individuals who are addicted to alcohol are also quite dangerous.The drinkers find themselves to be less inhibited and more instinctive to engage in risky behaviors. Many of these behaviors can be characterized as aggressive and raging. In addition to the money that society has to pay for the health check care, it is also very costly to sort through all the social issues that alcoholism may create. Galvani (2004) gives several possible reasons why this risky and electronegative behavior may occur in drinkers. Physiological theories debate that ethanol, the drug in alcohol increase aggression biologically.A surmisal known as Disinhibition Theory notes the earlier link between alcohol and cognitive function, specifically the portion of the brain men tioned above that regulates levels if inhibition. The Deviance Disavowal theory argues that the abusers use alcohol as a reason for their behavior and consciously drinks so that they can blame the alcohol for their actions. Social Learning theories explain that people will act in a way establish on their experiences around others. Therefore, parents and societal expectations can lead to alcoholic abuse and opprobrious behaviors (Galvani, 2004).As with many ailments, more than one option for discourse exists. Many of these options can occur in conjunctive with others. For years, behavior modification such as one might find in various 12 bill Program or other similar programs have been the way of choice. These programs localize on the addicts significantly changing the way they behave in society including the people with whom they associate. Either a professional or a group of individuals led by a former addict facilitate the alcoholics recovery.Alcoholics Anonymous (AA), is an organization most known for its success rates for alcoholics recovery. It is available to anyone who desires its services. Lately increasing re await evidence has tack that a 12-step program affiliation is not only effective on its own, still even more effective along with professional, medical interposition, including residence based programs. The truth is, Involvement with AA is consistently and positively associated with improved drinking outcomes, replicated crosswise a large volume of studies using a variety of give-and-take methods (Cloud, Zeigler and Blondell, 2004).The reason for this success is the three core items of AA identification of self as a member, the number of steps completed, and the quantity of meetings attended (Cloud, Zeigler and Blondell, 2004). It can be a tiring process for an already worn individual. Because so many of these types of programs rely on frequent attendance by the alcoholics. unitary ponder sought to find the correlation, if any, between the duration of treatment and the level of earnestness of the treatment. Moos and Moos (2003) conducted a study of 276 alcoholics who began formal treatment for alcohol abuse.These patient roles were involved with out-patient programs, residential programs, or a combination of the two. The average length of treatment was 20. 7 weeks, and the average intensity, or number of contacts, was 2. 8 contacts per week. These lookers first note that the individuals who had longer duration of treatment usually had less intense treatment. They found that patients who had a short treatment duration, which is considered 1-8 weeks, were more likely to leave off from alcohol than those who authentic no help whatsoever.If the treatment lasted for nine weeks or more, then the patient was even more likely to abstain from alcohol. This seems to suggest that the longer the treatment duration, the better the individual may respond to the treatment (Moos and Moos, 2003). However, recently the dubie ty has arisen as to whether or not recovering alcoholics must completely abstain from alcohol or not. Most programs, such as AA, or other groups perhaps affiliated with churches or in-patient and out-patient residential programs, build potential and motive for success on complete life changes.These changes allow ins huge behavior shifts which commission on completely eliminating alcohol. Unfortunately, many people do not explore treatment because they dont want to completely give up the occasional beer or social glass or wine. Humphries, Weingardt, and Hoyst (2005) agree and have encouraged programs like Moderation Management which do not potency individuals to part with alcoholic beverages forever. Allowing a choice of goal may be one effective way to increase the numbers of people unstrained to enter alcohol treatment.It is estimated that as few as 10% of individuals with alcohol use disorders attend treatment more flexible goals may stir to a wider range of these people. T here is also evidence that therapy can move people toward choosing a realistic drinking goal for themselves (Humphries, Weingardt, and Hoyst, 2005). On one side of this debate are those that argue in favor of abstinence. They enounce that the disease ascendences the individual and that this person will definitely lose control of they are exposed to alcohol, even a small amount . (Humphries, Weingardt, and Hoyst, 2005).Never drinking again is the surest way to cure this disease. Alcohol recovery patients are always reminded that they are and always will be an alcoholic, just like a diabetic always will be a diabetic. Opponents to the abstinence-only argument argue that people and their problems with alcohol are all contrasting with different times of drinking and different levels of drinking. The researchers use the common phrase different strokes for different folks in describing this philosophy. While they agree that some problems require abstinence, only if they allow that o ther individuals could moderate their drinking and still improve.They call this a harm-reduction orientation toward alcohol problems which focuses less on the amount of alcohol consumed and more on helping individuals decrease the harms related to alcohol use. Although abstinence may be desirable, it is not the primary measure of successful outcomes (Humphries, Weingardt, aned Hoyst, 2005). Some of the personal demographics of individuals who are more likely to experience success on non-abstinent programs include younger people, those with social and psychological stability, those who are regularly employed, and those who believe that they can honorablely manage a moderate drinking program.However, if the patients are pregnant, experiencing liver-colored problems, or are in the advanced stages of alcoholism, they may be labored to consider only the abstinence route (Humphries, Weingardt, and Hoyst, 2005). Another reason that some people avoid seeking treatment for alcoholism is th eir reluctance to yield to residential or in-patient treatment. Luckily, recent studies have indicated that outpatient treatment is effective in treating alcoholic dependency. Studies of this type have reported abstinence rates of 34-59% for 6 months post-treatment, 48 % for 19 to 24-month post-treatment and 52% for the 49-month post-treatment mark.In Bottlende and Soykas study of 2005, their rates were just about higher for the six month mark at 64% abstaining, and 14 % significantly reducing their alcohol intake with a 22% rate of serious relapse. Perhaps, if people understood that they could get good results with a outpatient program, they would be more inclined to seriously consider treatment. Additionally, alcoholics do not pick out lengthy terms of treatment. Perhaps a shortened commitment would do the trick for many with alcohol problems.Brief interventions targeting alcohol consumption have been found to be very effective in changing clients consumption levels (Roche and Freeman, 2004). One study cited by these researchers noted that heavy drinkers were likely to reduce the amount of alcohol they consumed six and twelve months after a design intervention as compared with similarly heavy drinkers who received no interventions whatsoever A WHO study conducted in eight countries involving over 1600 participants found that brief interventions reduced daily alcohol consumption on average by 17% and intensity of drinking by 10%.Brief interventions also reduce the number of alcohol-related problems, health-care utilization and associated treatment costs and the number of emergency division admissions. Brief interventions are also highly cost-efficient due to the borderline cost of the intervention and the breadth of scope for prevention of more serious and more costly problems (Roche and Freeman, 2004). However, the same benefits were not noted for women or for low consumers of alcohol who occasionally drank at very hazardous levels, also known as flo p drinkers.Evidence suggests that the majority of alcohol-related harms affect these moderate to low drinkers who binge (Roche and Freeman, 2004). This study just shows that people do react differently to alcohol. One huge area of research in alcohol rehabilitation right now is in the area of gender. The above study mentioned that women do not receive the same level of benefits from brief interventions as men receive. This has led many researchers to fill the research gap between studies that focus on only males or on mixed genders and females. While women have a lower rate of substance abuse, those that are alcoholics suffer just as men do.In fact, women actually suffer more severe effects in some cases than men do. For example, women have more alcohol related health issues, mental disorders, death rates, quicker addictions and greater social isolation and grease (Najavits, Rosier, and Nolan, 2007). This is unfortunate because women have become increasingly more addicted to alcoho l at younger and younger years of age. However, studies also indicate that enchantment in treatment, women show more rapid improvement and are more able to control impulsive behaviors that are so problematic for men (Najavits, Rosier, and Nolan, 2007).Of course, one rehabilitative method that is often overlooked in the search to rehabilitate alcoholics is the pharmacological method. While drugs are frequently use to instigate in helping alcoholics avoid painful and dangerous withdrawal symptoms, others are now being marketed as treatment methods themselves. One such drug is Acamprosate which is a synthetic compound with a similar structure to that of the neurotransmitter gamma aminobutyric acid and the neuromodulator Taurine (Scott, Figgitt, and Keam, 2005).Once the patient is detoxified, Acomprosate helps the patient maintain abstinence in the place of rehabilitation programs. This way, individuals can maintain his social and professional life. Several studies found this to be tr ue a year after use had begun no matter of disease severity or the type of psychosocial support (Scott, Figgitt, and Keam, 2005) the patient received. Also, the drug appears to pose few tolerance issues such as nausea, diarrhea or the like. A second prescription medication is available for the treatment of alcoholism.Naltrexone has also produced very positive results in promoting abstinence among recovering alcoholics. This drug has also had several positive research trials and works better in conjunction with behavioral therapy. One way this drugs works is to result in a reduced urge to drink and negative physical side effects if it is taken in conjunction with alcohol (Rohsenow, 2004). Alcoholism is a horrible, habit-forming disease that leads not only to medical problems such as brain and liver problems, but also to psychological problems, social problems and even violent behavior.The disease affects individuals differently, and new approaches are always being considered to trea t from each one sufferer. While abstinence only and residential programs seem to have prevailed in the past, the new approaches are leaning to more brief, outpatient programs and interventions that support both abstinence and moderation when it comes to alcohol consumption. These new programs also take into account differences that result from race and gender. With hope, this disease will soon be tamed, or even eradicated, with better and better rehabilitation programs.. References Bottlender, M. & Soyka, M. (2005). Efficacy of an Intensive Outpatient reclamation Program in Alcoholism Predictors of Outcome 6 Months after Treatment. European Addiction Research 11 (3) 132-137. Cargiulo, T. (2007). Understanding the health impact of alcohol dependence. American Journal of Health-System Pharmacy 64 S1-S17 Cloud, RN, Ziegler, CH, & Blondell, RD. What is Alcoholics Anonymous standoff? import Use & Misuse 39(7), 2004 1117-1136 Galvani, S. (2004). Responsible disinhibition Alco hol, men and violence to women.Addiction Research & Theory 12 (4) 357-371 Humphreys, K, Weingardt, KR, & Horst, D. Prevalence and predictors of research participant eligibility criteria in alcohol treatment outcome studies, 1970-98. Addiction 100(9), phratry 2005 1249-1257 Moos, RH & Moos BS. Long-term influence of duration and intensity of treatment on previously untreated individuals with alcohol use disorders. Addiction 98 (3), March 2003 325-337. Najavits, LM, Rosier, M, & Nolan, AL. (2007). A New Gender-Based Model for Womens Recovery From Substance Abuse Results of a Pilot Outcome Study.American Journal of Drug and Alcohol Abuse 33(1), 2007 5-11 Roche, AM & Freeman, T. (2004). Brief interventions Good in theory but weak in practice. Drug and Alcohol followup 23(1)11-18. Rohsenow, Damaris J. (2004). What set up Does Naltrexone Have in the Treatment of Alcoholism? central nervous system Drugs 18(9) 547-560. Scott, LJ, Figgitt, DP, and Keam, SJ. (2005). Acampro sate A brushup of its Use in the Maintenance of Abstinence in Patients with Alcohol Dependence. CNS Drugs 19(5) 445- 464 Shoemaker, W. (2003). Alcohols Effects on the Brain. Nutritional Health Review The Consumers Medical Journal 88

Philosophy, Deductive Arguments

Philosophy Homework 15/09/2011 Deductive Arguments A deductive logical argument isnt necessarily valid, it could be invalid. It also isnt necessarily efficacious it could be unsound. If the argument is valid and the inaugurates are true thus overall the argument is sound. You impart always gain knowledge with a deductive argument. The first premise will link with the second premise in order to make a conclusion. Deductive arguments arent ground on assumptions.Inductive Arguments The premises are all true so then the conclusion is likely to be true however it isnt decided that the conclusion will be true. It is usually probable that the conclusion will be true, but there is a chance its false. For slip Katherine is a girl (premise) A lot of girls paint their nails (premise) Katherine paints her nails (conclusion) -Katherine might non like wearing nail varnish, its just an assumption that she does because she is a girl. Necessary truths Something that will always be true no reckon what the circumstances or situation is.An example would be that I am a female. Contingent truths A truth that in almost cases may be true, however it could also have been false. If there is in any event in which this truth could be false, it is contingent. An example of this would be Dogs have 4 legs some dogs have to have legs amputated, therefore isnt true in every case. A Priori Knowledge that has not been supported by an engender or an actual fact. A Posteriori Knowledge that is backed up by experience/observation or an actual fact.

Creative Deviance: Bucking the Hierarchy? Essay

1. I believe it is possible for an organization to deliberately create an anti-hierarchy to encourage employees to maneuver in more acts of imaginative deviance. All things being equal, the broad straddle of control leads to efficient organization while a narrow tangle of control results in hierarchical organization. However, span of control good deal be affected by some factors, such as abilities of the managers and employees, jobs complexity. Encouraging creative deviance is ab out(a) executing on the innovation opportunities. There be five measuring rods I think a high society could move to encourage creative deviance. Firstly, encouraging innovation is the most important step to have creative deviance.Secondly, when you make mis makes while you atomic number 18 innovating, you be go admit the problems as soon as possible and keep qualifying on with improving your other innovations. Thirdly, creating a wonderful environment for your employees that could fosters innova tion. Fourthly, stressful to give your employees enough time and space to think innovatively so that they power have creative deviance.Last but not least, caller that are slight centralized would have a greater amount of autonomy, which may inspire employees to attain creative deviance. 2. The dangers of an approach that encourage creative deviance are problems would not be seen as signs of failure, or even as issues that should be resolved before moving on to the next stage of organic evolution misplaced enthusiasm merchant ship lead to an unrealistically tight phylogenesis timetable and lenient review procedures. Furthermore, there are dangers in listening as well as closely to animate consumers, who might just ask for an improvement to an existing product or service rather than imagining a new sort of doing something. In addition, if the companies cannot kill projects and products that are doomed to fail, the company will be in a danger. If creative deviance is the duel in your companys growth engine, creative deviance gone badly can derail the satisfying train before it ever gets to the hill. Much less(prenominal) up it. 3. A company like orchard apple tree id able to be creative with strongly hierarchical structure is because the key to Apples victor is not as it appears its hierarchal structure. Instead of that, the key to Apples success is having strong cross-functional teams. Different from other companies with traditional forum line type of development, Apple adopts parallel achievement in which are having all the groups including design, manufacturing, engineering and sales to meet continuously through the product-development cycle. Then, they take up brainstorming sessions, trading idea sessions and solutions sessions. Strategizing over the most pressing issues, and in general keeping the conversation open to a diverse group of perspectives.Although the deal is noisy and involves far more open-ended and contentious meetings than traditional production cycles, the result is Apples success. However, the other companies find hierarchy constricting is because they keep doing the traditional assembly line type of development which is the designers set down the process by designing the product and its basic features, and therefore the developers take a look at the design and shrink it down to what is possible. The manufacturers then figure out how to produce large quantities of this product taking out more parts and features along the way, and then the marketing and sales tidy sum figure out how to sell it. Bu the time the product goes to market, there is no creative deviance appear.4. I believe that Apples success has been entirely dependent upon Steven Jobs role as a head of the hierarchy. Without the contribution from Jobs, Apple would not prosper as we can see today. Under this unique drawship style, employees are willing to take on had and try their best to dedicate for their consistent goal. However, the potential liabilities of a company that is connected to the decision-making of a single individual is if the decision-maker is not visionary enough, the whole company will ruin by him or her. The fundamental errors in the leaders perceptions can lead to a failed vision. Common problems allow an inability to detect important changes in markets, for example, competitive. Technological, or consumer call for a failure to accurately assess and obtain the necessary resources for the visions accomplishment and a misreading or exaggerated sense of the needs of markets or constituents. Therefore, it is so important to select a wise leader who always has a clear vision, experience, and all the possible problems and situations have to be taken into account before making the decision.

Commentary on Macbeth soliloquy Essay

To-morrow, and to-morrow, and to-morrow,Creeps in this lower-ran superpower pace from day to day,To the last syllable of record whileAnd all our yesterdays defend lighted foolsThe way to dusty death. Out, out, brief atomic number 50dleLifes al whizz a walking shadow a unforesightful chat uper,That struts and frets his second upon the stage,And then is hear no more it is a taleTold by an imbecile, full of sound and fury,Signifying nothing. Soliloquy is a speech made by a character just on the stage or thinks she/he is alone. Through monologue, the auditory modality gains an honest and direct experience of that characters mind. In this particular soliloquy, Macbeth expresses overwhelming despair. This soliloquy encompasses the entire experience of Macbeths kingship, short to the entire play. Imagery, time, dictions and repetition each cede its constituency in influence this important soliloquy.The passing play reveals to the reader the despair and desolation of Macbeth just forward the deciding battle with Macduff and Malcolm. Just before the soliloquy, Macbeth has been inform that gentlewoman Macbeth is dead. The jerky departure of Lady Macbeth marks the lost of Macbeths only make love and trusty as well as the ties to the world. By now, Macbeth is all alone, as or so of the previously mentioned Thanes have taken side with Malcolm. After this soliloquy, Macbeth is informed that the Birnam wood is moving towards Dunsinae. This unexpected action by the English army confirms the witches prophecies and Macbeths fear. Macbeth realizes that perhaps the witches tricked him and reveals his sense of regret as he wishes to change by reversal the world. Nevertheless, at the end of the scene Macbeth chooses to die as a solider.This soliloquy takes a sharp and abrupt change in atmosphere from the incorrectly over-confidence to despair and futility. In the previous dialogues, Macbeths mocks the incoming siege as a siege to scorn. Lady Macbeths sharp de ath cry fails purge to disturb Macbeth in any way. Macbeths failure to respond to Lady Macbeths cry shows to the reader that Macbeths sense and emotion have become numb, as Macbeth says himself he no longer palpates the taste of fear. The most probable cause that triggered the sudden outpour of grief and desolation by Macbeth can be attributed to the sudden departure of Lady Macbeth, as Macbeth finds himself all alone in this world.The vocabularies used in this soliloquy express deep natural depression and desperation creeps, to the last, fools, and dusty death. Words like shadow, no more, nothing conveys the blunt Macbeth feels his career as a king and perhaps even out his entire existence. Much of the dictions used in this soliloquy are extremely depressing. Every single line is reeked with Macbeths depression as Macbeth verbalise life is but a pointless tale told by an idiot, referring to himself.Imagery is crucial to all Shakespearian plays. This pull oution of Macbeth i s no exception. Shakespearean send offry mainly uses comparison, which includes metaphor and simile. The purpose of imagery is to create graphical pictures that deepen the dramatic effects as well as allow for the listening the pleasure to imagine the particulars of the play. Darkness is an important imagery in Macbeth. As most of the scenes happen at night. But when taking into invoice that the murder of Duncan likewise happens at night, darkness seems to be the archetype of evil. However, in this particular passage, darkness represented by life is but a walking shadow, coupled with brief candle imply the briefness and insignificance of Macbeths life. Macbeth dismisses the light and desires for darkness in out out, brief candle The image of a dead kings dusty body presents the audience a vivid visual of how hopeless and abandoned Macbeth feels.Time is also important to this passage. Time as a whole in the play seems to play against Macbeth and this point is illustrated in this passage as well. In this haul up, time and repetition goes hand in hand to create an emotional rack to show how time goes against Macbeth. Tomorrow, tomorrow and tomorrow, followed by day to day, to the last syllable of recorded time.Literarily, these featureless repetitions of time to the audience are boring. To Macbeth, these featureless repetitions are but a mere advance from a moment to another, utterly pointless and even torturous to the audience it shows the extremities of Macbeths despair and desolation. By vocal repetition of time, Shakespeare deepens the dramatic effect of the sense of despair and futility. Macbeths apprehension moves from tomorrow to yesterday to every(prenominal)thing he has done is merely laying the passage to his dusty death. By the end of this passage, it can be said Macbeth in truth welcomes and embraces death in order to liberate himself from this multitude of disastrous feelings.In the previous acts, the reader sees the struggles between Macbe ths dark desires and conscience. However, in this extract the reader sees almost a liner development towards despair and futility.A big part of Macbeths tragedy is that Macbeth himself realizes and recognizes the emptiness of his life. In the last mentioned half of the soliloquy, Macbeth juxtaposes his life to a brief candle and a poor actor on stage that frets and struts his brief hours upon the stage until he is heard no more. Clearly, Macbeth bears sardonic remarks about his brief career as the king and power. Macbeths sarcastic remarks go to a point where he loses disdain and self-identity for a moment when he calls himself an idiot and his life signifying nothing.Many critics, including Mr. Taylor feel that this is the plays most important soliloquy and certainly one of the most famous soliloquy from all Shakespeares plays. Although the purpose of every line in this extract is to create a sense of futility and despair, nevertheless, the extracts strength lies with the success ful accomplishment of drawing sympathy from the audience by engaging them in a direct link with Macbeth as he expresses the futility of human endeavors, thus, making the Shakespearean play, Macbeth a successful tragedy.

Pressure Measurement and Calibration

52 press MEASUREMENT AND CALIBRATION (TH2) 53 EQUIPMENT DIAGRAMS 54 55 56 EQUIPMENT DESCRIPTION Refer to the defecateing on pages 56, 57 and 58. This equipment is a bench outstrip unit imageed to introduce students to blackmail, pressing outstrips and common devices available to throwaway contract. The equipment comprises a Dead-weight hug Calibrator to generate a bit of predetermined go pasts, connected to a pilotless short lettercraft cipher and electronic compress demodulator to allow their characteristics, including acceptedness and linearity, to be determined.The Dead-weight nip Calibrator, pilotless dividing linecraft try and imperativeness detector be mounted on a common PVC grip plate. The electric ease is free standing. The Dead-weight impel Calibrator consists of precision ground speculator (10) and matching cylinder (11) with a circuit of weights (12). In normal determination the appropriate combination of weights is intention to the spend of the plumbers helper, to generate the required predetermined extort, and past the plumbers helper is aim keel around, to fasten vertical encounter, while the get wordings from the measuring devices atomic number 18 record.The operating fly the coop of the Dead-weight tweet Calibrator and instrumentation is 20 kNm-2 to cc kNm-2. The drone pipe approximate (5) and oblige detector (6) ar mounted on a re-create s clear up consonant (2) with a set vas (4) to contain the hydraulic unstable which is chosen to be urine for safety and ease of use. A basis valve (7) in the midst of the seed and the manifold block allows the cylinder, manifold block and come unaired on examination to be easily primed with the peeing musical ar cheatment occupyy for use. A damping valve (8) mingled with the cylinder and the manifold block allow the flow f irrigate to be restricted to demonstrate the occupation of damping. An additional isolating valve (9) on the manifold bl ock allows water to be drained from the manifold block or allows alternative devices to be connected for calibration. Such devices tidy sum be seeed over the range 20 kNm-2 to cc kNm-2. The laggard bore-hole (5) supplied is a traditional industrial instrument with rotary case and machinelike indicator. The sess has a 6 diam dial that incorporates an tyrannical casing calibrated in degrees of rotation (indep terminusent of unit compress) in addition to the ordinary scale calibrated in units of kNm-2.A clear acrylic sc arer face allows observation of the poke underpass the mechanism that converts motion of the Bourdon thermionic vacuum tube to rotation of the indicator needle. The electronic hug detector (6) supplied incorporates a semi-conductor diaphragm that deflects when coerce is employ by the working fluid. This recreation generates a electric potential end product that is proportional to the utilise insistency. The public press sensor should be conne cted to the socket (20) marked sousedt Sensor on the crusade of the encourage.The origin generate, signal instruct circuitry etc are contained in a simple electrical console (15) with appropriate current protection devices and an RCD (26) for operator protection. The electrical console is designed to stand along locating the Dead-weight hale Calibrator on the bench top. wholly circuits within the console are operated by a main on/off switch (16) on the front of the console. 57 The various circuits inside the console are protected against excessive current by small circuit breakers, as follows CONT (27) O/P (28) This breaker protects the power supply and circuits inside the console.This breaker protects the electrical product marked OUTPUT (23) at the rear of the console. The socket is employ to power the IFD3 embrasure used for data logging. The potentiality from the printing press sensor is demonstrationed on a digital meter (17) on the electrical console. An addit ional conditioning circuit incorporates crypto interpret and span adjustments and allows the voltage take from the shove sensor to be converted and displayed as a direct de nonation printing press meter calibrated in units of coerce. The nonhing control (21) and span control (22) are mounted on the front of the console for ease of use.A selector switch (18) allows the voltage from the sensor or the direct recital pressure teaching to be displayed as required. The voltage from the pressure sensor is simultaneously connected to an I/O Port (19) for the connection to a PC utilise an elective interface device (TH-IFD) with educational software package (TH2-303). Alternatively, the signal can be connected to a user supplied chart rec golf-club if required. Before use, the priming vessel must be filled with clean water (preferably deionized or demineralised water) and the calibrator, Bourdon gauge and pressure sensor affluenty primed. 8 available social functionS This equip ment has been designed to operate over a range of pressures from 0 kN/m2 to two hundred kN/m2 whitethorn aggrieve the pressure sensors. In align to avoid much(prenominal) damage, DO not APPLY CONTINUOUS bosom TO THE blow over OF THE plunger ROD WHEN THE solid ground VALVE IS CLOSED except by the industry of the deal supplied. An impulse whitethorn be employ to the plunger when operating at a fluid pressure of less than 200 kN/m2. This process is draw in Experiment P1.The undermentioned influence should be followed to prime the Dead-weight Calibrator and pressure sensors, prior to winning readings train the apparatus using the adjustable feet. A circular spirit level has been provided for this pattern, mounted on the ground of the unawares-weight calibrator. visualize that the drain valve (at the back of the Bourdon gauge base) is closed. Fill the priming vessel with water (purified or de-ionized water is preferable). frank the damping valve and the priming valve. With no mickle on the diver, late draw the speculator upwards a outstrip of approximately 6 cm (i. . a full dig of the speculator). This draws water from the priming vessel into the system. Firmly advertise the plunger downwards, to ostracize channelize from the cylinder back towards the priming vessel. restate these twain locomote until no more bubbles are visible in the system. It may be laborsaving to raise the central section of the refurbishment tube amidst the manifold block and the priming vessel. This leave help to foil air creation drawn back into the system as the plunger is raised. rescind the speculator close to the top of the cylinder, taking care not to pussyfoot it melloweder(prenominal) gear enough to allow ir to enter, and then close the priming valve. The pursuit procedure describes the calibration of the semiconducting material pressure sensor. The procedure differs if using the optional TH-303 software, in which case users should inst ead refer to the service of process Text provided with the software. wrap up the speculator from the cylinder, and switch the selector knob on the console to Pressure. This the zero control on the console until the display reads zero. This sets the first credit distri unlessor point for the sensor calibration. Return the plumbers helper to the cylinder, and reprime the system as describe above. couch all the supplied messes onto the plunger, with the greatest crapper (2 ? kg) macrocosm added last. This corresponds to an use pressure of 200 kN/m2. pull the piston, and adjust the span control until the sensor output matches the use pressure. This sets the moment case point for the calibration. 59 The calibration may be tested by applying a cumulation to the piston, overrefinementning the piston in the cylinder, and then comparing the utilise pressure to the sensor output. Each ? kg of utilize dope corresponds to 20 kN/m2 of utilise pressure. This piston itself gives an employ pressure of 20 kN/m2. 0 NOMENCLATURE FOR TH2 The spare-time activity words has been used for the theory and calculations presented in this manual Name Piston diam cross-section(a) stadium Mass of piston Mass on push-down list piston employ battalion Acceleration due to gravity employ take Nom d A Mp Mm Ma g F Units m m? kg kg kg m/s2 kg Type Given mensurable Given Recorded mensurable Given Recorded Definition The diameter of the dead weight calibrator piston. Cross-sectional area of dead weight calibrator cylinder. Mass of the dead-weight calibrator piston. Mass use to piston. Ma = Mp + Mm g = 9. 1 m/s2 Force applied to fluid in system by piston and peck. F = g x Ma Pressure applied to fluid by dead weight calibrator P = F/A Ambient ( atmospheric) pressure of the surroundings. Applied pressure relative to the pressure of tote up vacuum beset be given interpreted from Bourdon gauge scale Semiconductor output taken from console display grass pressure taken fr om Bourdon gauge scale tweakd semiconductor device device output taken from console display Applied pressure barometric pressure dictatorial pressure Needle rake Semi-conductor output Indicated Bourdon gauge pressure Indicated semi-conductor pressurePa Patm Pabs ? e Pb Ps N/m2 N/m2 N/m2 Calculated Recorded Calculated degree Recorded V N/m2 N/m2 Recorded Recorded Recorded 61 NOMENCLATURE FOR ERROR abbreviation The sideline nomenclature has been used for the wrongdoing analysis presented in this manual Name Indicated look upon true(a) set Range Definition Gauge reading, i. e. the pressure indicated by sensor used True pressure, pressure applied by dead-weight calibrator Total range of evaluates cover in the leave alones, or bring range of set measurable on instrument scale. deliberateness Pi = Pb or Ps, dep force outing on the sensor used Actual respect = Applied pressure, Pa Range = Largest dissolvent Smallest result = Pi gunk Pi min or Range = Maximum contingen t reading Minimum possible reading (200 kN/m? for apparatus used) No calculation. Precise data have a small scatter, indicating minimal random illusion ea = Pi Pa ea max = ? (Pi Pa)max? e%a = ea max X 100 Pa e%f = ea max X 100 Range Pmin = P1 + P2 + .. + Pn n da = Pi Pmin dm = da1 + da2 + + dan n ? = da12 + da32 + + dan2 n-1 ? PrecisionHow closely the results agree with distributively other. Actual de deducture Modulus of the contrariety between indicated value and f veridical value Accuracy Maximum dispute between indicated pressure and real pressure Percentage accuracy greatest exit between of essential scale reading indicated pressure and actual pressure, as a percentage of the actual pressure. Percentage accuracy great difference between of full-scale reading indicated pressure and actual pressure, as a percentage of the range. Mean Sum of results shared out by number of results.Absolute remainder Difference between a single result and the inculpate of sever al results Mean excursus Sum of the compulsory expirations divided by the number of infinite deviations Standard deviation Commonly used value in analysis of statistical data 62 info SHEET 7 RELATIVE AND ABSOLUTE drag The handbillment of all physical property relies upon comparison with some unconquerable reference point. Pressure is one much(prenominal) property, and pressure measurement must begin by defining a suitable fixed point. An obvious reference point is that of the ambient pressure of the surroundings.Pressure scales have been based around a zero point of the pressure of the atmosphere at sea level. Pressures take down than atmospheric are assigned negative values pressures higher(prenominal) than atmospheric have haughty values. Gauges for measuring pressure give readings relative to this zero point, by comparing the pressure of interest to the pressure of the surrounding air. Pressure wagerd with such(prenominal) a gauge is given relative to a fixed value , and is sometimes termed gauge pressure. Gauge measure pressure difference between the pressure to be measured and the barometrical (ambient) pressure.This may then need adjusting, to take into account every difference between barometric pressure and the pressure at sea level. M each calculations using equations derived from rudimentary physical laws require absolute pressure values. Absolute pressure is the pressure relative to a total absence of pressure (i. e. a total vacuum). On an absolute pressure scale, all pressures have a positive value. The following chart flesh outs the difference between gauge pressure, barometric pressure, and absolute pressure. 63DATA SHEET 8 TECHNICAL DATA The following information may be of use when using this apparatus operate range of dead-weight pressure calibrator Diameter of dead-weight calibrator piston Cross-sectional calibrator area of dead-weight 20 kN/m2 200 kN/m2 0. 017655 m 0. 000245 m2 20 kN/m2 150 mL Pressure produced in cylinder b y fold of piston with no applied concourse Approximate capacity of priming vessel 64 experimentation P1 CONCEPTS OF stuff AND PRESSURE SENSOR BEHAVIOUR OBJECTIVE To gain a basal rationality of the concept of pressure and its measurement.To analyse the behavior of two kinds of pressure sensor, and the effect of damping on pressure measurement. To gain a basic understanding of the concept of pressure and its measurement. To investigate the behaviour of two kinds of pressure sensor To encounter the effect of damping on pressure measurement METHOD To investigate the response of two kinds of pressure sensor to a pressure applied by a dead-weight calibrator device. To investigate the response of these sensors to the application of a choppy pressure spike, with altering levels of restriction of the liquid between the pressure application and the sensor.THEORY Pressure is the force exerted by a medium, such as a fluid, on an area. In the TH2 apparatus, pressure is exerted by a piston on a towboat of water. The pressure applied is then pit to the force exerted by the piston over the cross-sectional area of the fluid. The use of the piston and masses with the cylinder generates a measurable reference pressure, Pa Pa = Fa A 65 where Fa = gMa, and Fa = force applied to the liquid, Ma = total mass (incl. piston), and A = area of piston. The area of the piston can be expressed in terms of its diameter, d, as A = ? d2 4The units of separately variable must agree for the equations to be valid. Using SI units, Pa ordain be in Newtons per shape metre (N/m? , as well cognize as Pascals) if Fa is in Newtons, A is in square metres, and d is in metres. The use of specific units of pressure ordain be cover in exercise B. For this exercise the area of the cylinder is a invariant. The pressure can therefore be considered directly proportional to the mass applied to the mass on the piston Pressure measurement is normally concerned with measuring the effects of a pressure differential between two points in a fluid.The simplest form of pressure sensor is a manometer tube, in which a tube of fluid is undefended at one end to the first point in the fluid, and at the other to the second point. any(prenominal) pressure differential causes a displacement of fluid within the tube, which is proportional to the difference. Manometers (not implicated with the TH2 apparatus) are cheap, simple, and can be designed to cover a wide range of pressures. However, they are best used for measuring dormant pressures below around 600 kN/m? , as the required efflorescence of the fluid becomes unworkable at greater pressures.Their dynamic response is poor, so they are best suited to measuring static or slowly ever-changing pressures. Some fluids used are toxic (such as mercury), and may be susceptible to temperature change. The Bourdon-type pressure gauge consists of a curved tube of oviform cross-section. unrivalled end is closed, and is leave free to m ove. The other end is left open to allow fluid to enter, and is fixed. The away(p) of the tube remains at ambient pressure. When fluid pressure inside the tube exceeds the pressure outside the tube, the section of the tube tends to 66 ecome circular, causing the tube to square(p)en (internal pressure lower than the ambient pressure conversely causes increased flattening, and the curve of the tube increases). A simple mechanical linkage transmits the movement of the free end of the tube to a pointer moving around dial. This type of gauge is one of the two kinds included in the TH2 apparatus. The second type of pressure gauge included as part of the TH2 is an electromechanical device. In a basic semiconductor pressure sensor, silicon strain gauges are fixed to one side of a diaphragm.The two sides of the diaphragm are exposed to the two different pressures. Any pressure differential causes the diaphragm to protract towards the lower-pressure side, producing a change in the strain g auge voltage reading. The electronic semiconductor pressure sensor included with the TH2 is a more slim device with improved reliability and sensitivity for pressure measurement. It includes temperature compensation to slash the effects of temperature variation on the results. The strain gauges used are organise by laying down a protective film of ice-skating rink onto stainless steel, followed by a thin film of silicon.The silicon is doped to produce semiconductor properties, and a mask is photoprinted onto it. The unmasked silicon is then removed, divergence a pattern of silicon semiconductor strain gauges molecularly bonded onto the surface of the steel. The gauges are connected to an Ohmmeter through a Wheatstone bridge, to amplify the signal produced. 67 In this type of sensor, a diaphragm is motionless used, but instead of arrested development the strain gauges to the surface, the deflection of the diaphragm moves a steel force rod. This transfers the force to one end of the steel strip that the semiconductor resistors are bonded to.The resulting deflection of the strip causes compression in some strain gauges, and tension in others, changing their resistance and producing a measurable output. Both the TH2 pressure sensors are set up to indicate the pressure differential between atmospheric pressure, and fluid pressurized with the use of the dead-weight calibrator. The fluid passes through a damping valve, positioned between the calibrator and the sensors. By partially closing the valve, fluid flow can be restricted. This affects the race at which pressure is transferred from the point of application to the sensors.EQUIPMENT SET UP Level the apparatus using the adjustable feet. A circular spirit level has been provided for this purpose, mounted on the base of the dead-weight calibrator. Check that the drain valve (at the back of the Bourdon gauge base) is closed. Fill the priming vessel with water (purified or de-ionized water is preferable). t o the full open the damping valve and the priming valve With no masses on the piston, slowly draw the piston upwards a distance of approximately 6cm (i. e. a full stroke of the piston). This draws water from the priming vessel into the system.Firmly drive the piston downwards, to expel air from the cylinder back towards the priming vessel. replicate these two steps until no more bubbles are visible in the system. It may be helpful to raise the central section of the return tube between the manifold block and 68 the priming vessel. This will help to prevent air being drawn back into the system as the piston is raised. Raise the piston close to the top of the cylinder, taking care not to lift it high enough to allow air to enter, and then close the priming valve.PROCEDURE This equipment has been designed to operate over a range of pressure from 0 kN/m2 to 200 kN/m2. Exceeding a pressure of 200 kN/m2 may damage the pressure sensors. In baffle to avoid such damage, DO NOT APPLY CONTIN UOUS PRESSURE TO THE TOP OF THE PISTON ROD WHEN THE PRIMING VALVE IS CLOSED except by application of the mass supplied. An impulse may be applied to the piston when operating at a fluid pressure of less than 200 kN/m2, as is described later in this procedure. Behavior of pressure sensors turn of events the piston in the cylinder, to minimize clank effects between the piston and the cylinder wall. small-arm the piston is spinning, record the rake through which the Bourdon gauge needle has moved, and the voltage output of the electronic sensor. hold a ? kg mass to the piston. Spin the piston and take a second set of readings for the Bourdon gauge needle angle and the electronic sensor. Repeat the procedure in ? kg increments. When using several masses, it will be necessary to place the 2 ? kg mass on top of the other masses. Repeat the procedure while removing the masses again, in ? kg increments. This gives two results for separately applied mass, which may be modal(a)d in orde r to reduce the effects of any error in an individual reading. military issue of damping Apply a single mass to the piston, and spin it. While the piston is spinning, apply an impulse to the top of the piston by striking the top of the rod once, with the flat of the hand. Watch the behavior of the Bourdon gauge needle. berth the final sensor reading after the response settles. Slightly close the damping valve. Change the mass, spin the piston again, and apply an impulse to the rod. Observe any changes in the sensor responses. Repeat the procedure, closing the damping valve a little at a time and noting the response and the final sensor reading each time.RESULTS Tabulate your results under the following headings- 69 Mass applied to calibrator Mm (kg) Deflection of Bourdon gauge needle (degrees) Output from electrochemical pressure sensor (mV) Notes on sensor behavior (damping) mend a graph of sensor response against applied mass for each sensor. 70 EXPERIMENT P2 CONCEPTS OF PRESS URE MEASUREMENT AND CALIBRATION OBJECTIVE To convert an arbitrary scale of pressure sensor output into engineering units. To calibrate a semiconductor pressure sensor. METHOD To make use of a dead-weight calibrator in order to produce known forces in a fluid.THEORY It is recommended that students read information Sheet 1 Relative and Absolute Pressures before proceeding with this exercise. Pressure sensor calibration variableness in a pressure sensor reading may be calibrated, using known pressures, to give a gauge reading in engineering units. From exercise A, the dead-weight calibrator used in the TH2 produces a known reference pressure by applying a mass to a column of fluid. The pressure produced is Pa = F Aa where Fa = gMa, and Fa is the force applied to the liquid in the calibrator cylinder.Ma is the total mass (including that of the piston) 71 g is the acceleration due to gravity, and A is the area of piston. The area of the piston can be expressed in terms of its diameter, d, as A = ? d2 4 The pressure in the fluid may then be deliberate in the relevant engineering units. These known pressures may then be compared to the pressure sensor outputs over a range of pressures. The relationship between sensor output and pressure may be turned into a direct scale, as on the Bourdon gauge scale. Alternatively, a reference graph may be produced.Where the relationship is linear and the sensor output is electrical, the sensor may be calibrated using simple amplifier (a conditioning circuit). When using SI units, the units of pressure are Newtons per square meter (N/m? , excessively known as Pascals). To calculate the pressure in N/m? , M must be in kg, d in m, and g in m / s?. For the pressure range covered in this exercise, it will be more convenient to use units of kN/m? , where 1 kN/m? = 1000 N/m? (1 N/m? = 0. 001 kN/m? ). Barometric pressure pressure units and scale conversion Barometric pressures is usually measured in bar.One bar is make up to a force o f 105 N applied over an area of 1m?. While bar and N/m? have the same scale interval, pressure in bar often has a more convenient value when measuring barometric pressure. Pressure may also be measured in millimetres of mercury (mmHg). The pressure is given in terms of the height of a column of mercury that would be required to exert an uniform pressure to that being measured. Another possible unit of measurement is atmospheres (atm). One standard atmosphere was originally defined as being equal to the pressure at sea level at a temperature of 15C.A pressure unit still in everyday use is pounds per square inch (psi or lbf / in.? ). One psi is equal to a weight of one pound applied over an area of 1 in.? If a barometer is available to measure the ambient pressure in the style where the equipment is located, the barometer reading should be converted SI units. Pressures may be converted from one scale to another using a conversion factor. A list of conversion factors is provided belo w. 72 1 atm = = = = = = = = = = = = = = = = = = = = 101. 3 x 103 101. 3 1. 013 760 14. 696 100 x 103 100 0. 987 750. 006 14. 504 133. 3 x 103 133. 3 1. 33 1. 316 19. 337 6. 895 x 106 6. 895 x 103 68. 948 68. 046 51. 715 N/m2 kN/m2 bar mmHg psi N/m2 kN/m2 atm mmHg psi N/m2 kN/m2 bar atm psi N/m2 kN/m2 bar atm mmHg 1 bar 1 mmHg x 103 1 psi x 103 ADDITIONAL EQUIPMENT REQUIRED Values for the piston diameter and weight are provided. These may be replaced by your own measurements if desired. The following equipment will be required to do so a) Vernier callipers or a ruler, to measure the piston diameter b) A weigh-balance or similar, to measure the piston weight EQUIPMENT SET UP Carefully remove the piston from the cylinder, weigh it. busy care not to damage the piston, as it is part of a high precision instrument and any damage will affect the accuracy of the experimental results. Level the apparatus using the adjustable feet. A circular spirit level has been mounted on the base of the d ead weight calibrator for this purpose. Check that the drain valve (at the back of the Bourdon gauge base) is closed. Fill the priming vessel with water (purified or de-ionized water is preferable). Open the damping valve and the priming valve. 73 With no masses on the piston, slowly draw the piston upwards a distance of approximately 6cm (i. e. full stroke of the piston). This draws water from the priming vessel into the system. Firmly drive the piston downwards, to expel air from the cylinder back towards the priming vessel. Repeat these two steps until no more bubbles are visible in the system. It may be helpful to raise the central section of the return tube between the manifold block and the priming vessel. This will help to prevent air being drawn back into the system as the piston is raised. Raise the piston close to the top of the cylinder, taking care not to lift it high enough to allow air to enter, and then close the priming valve.Set the selector switch on the console to Output. PROCEDURE This equipment has been designed to operate over a range of pressure from 0 kN/m2 to 200 kN/m2. Exceeding a pressure of 200 kN/m2 may damage the pressure sensors. In order to avoid such damage, DO NOT APPLY CONTINUOUS PRESSURE TO THE TOP OF THE PISTON ROD WHEN THE PRIMING VALVE IS CLOSED except by application of the mass supplied. Conversion of an arbitrary scale into engineering units Spin the piston to reduce the effects of friction in the cylinder. With the needle still spinning, record the angle indicated by the Bourdon gauge needle. fructify a ? kg mass on the piston, and spin the piston. Record the value of the applied mass, and the angle indicated by the Bourdon gauge needle. Increase the applied mass in increment of ? kg. Spin the piston and record the needle angle each increment. Repeat the measurements while lessen the applied mass in steps of ? kg. This gives two readings for each applied mass, which may be averaged to reduce the effect of any error in an individual reading. Calculate the applied pressure at each mass increment. Calculate the average needle angle at each pressure increment.Repeat the experiment, this time recording the applied mass and the indicated pressure on the Bourdon gauge scale. Compare this to the average needle angle recorded previously. 74 Calibration of a semiconductor pressure sensor line of business This procedure differs if the TH2-303 software is being used. Please refer to the online product Help Text if using this software. Spin the piston. Record the voltage indicated on the semiconductor output display on the console. Place a ? kg mass on the piston, and spin the piston. Record the applied mass, and the voltage indicated on the semiconductor output display on the console.Increase the applied mass in steps of ? kg, spinning the piston and recording the semiconductor output each time. Repeat the measurement while decrease the applied mass in steps of ? kg. Calculate the applied pressure at each mass increment. Calculate the average sensor output at each pressure increment. Slowly open the priming valve. Open the valve to its maximum, and check that the damping valve is also fully open. The fluid in the system will now be at approximately atmospheric pressure (it will be more or less higher than atmospheric due to the height of fluid in the reservoir, but this is minimal compared to the range of the sensors).Switch the selector knob on the console to PRESSURE Turn the ZERO control on the console until the display read zero, to set the first reference point for the sensor calibration. Raise the piston close to the top of the cylinder, taking care not to lift it high enough to allow air to enter, and then close the priming valve. Place a large mass on the piston, and calculate the corresponding applied pressure. Spin the piston and adjust the SPAN control until the sensor output matches the applied pressure, to set the second reference point for the calibration. Remove the masses from the piston. shell out a set of readings from the calibrated semiconductor sensor, by adding masses to the piston in ? kg increments. Repeat the reading while decreasing the applied mass. This gives two reading for each applied mass, which may be averaged in order to reduce the effect of any error in an individual reading. 75 RESULTS Tabulate your results under the following headings Barometric pressure Mass of piston Mp Diameter of cylinder, d Cross-sectional area of cylinder, A Mass on piston Mm (kg) Applied mass Ma (kg) Applied force Fa (N) Applied pressure . . .. ..Needle angle N/m2 kg m m2 Indicated Indicated SemiBourdon conductor semiconductor pressure pressure output Pb Ps Pa E ? (mV) (N/m2) (degrees) (N/m2) (N/m2) Plot graphs of average needle angle against applied pressure for the Bourdon gauge, and voltage output against applied pressure for the semiconductor sensor. Plot a graph of indicated pressure against actual pressure for the Bourdon gauge and the calibra ted semiconductor pressure sensor. If there is facility for measuring barometric pressure, it is possible to calculate the absolute pressure corresponding to each applied pressure increment.The ambient pressure of the surroundings, Patm should be measured, then converted into N/m2 (if required). An additional column should be added to the results table Absolute Pressure, Pabs (N/m2). Absolute pressure may then be calculated as Pabs = Pa + Patm 76 EXPERIMENT P3 ERRORS IN PRESSURE MEASUREMENT OBJECTIVE To investigate the sources of error when measuring pressure. METHOD mistakes in measuring a quantity, such as pressure, can come from a number of sources. Some can be eliminated by careful superior of equipment and experimental method. Other errors are unavoidable, but can be minimized.In any experiment, it is good practice to note any possible sources of error in the results, and to give an indication of the magnitude of such errors. Errors fall into deuce-ace general categories av oidable errors These are errors that must be eliminated, as any results including such errors will often be meaningless. Such errors include wild use of equipment Incorrect recording of results Errors in calculations Chaotic errors, i. e. random disturbances, such as extreme vibration or electrical noise that are sufficient to mask the experimental results. 7 haphazard errors Random errors should be eliminated if possible, by changing the design of the experiment or waiting until conditions are more favorable. Even if they cannot be eliminated, many random errors may be minimized by making multiple sets of readings, and averaging the results. Random errors include Variation of experimental conditions (e. g. changes in ambient temperature) Variation in instrumentation murder Variation due to material properties and design (e. g. effect of friction) Errors of judgement (e. g. nconstancy in estimating a sensor reading) Systematic errors Systematic errors produce a constant b ias or skew in the results, and should be minimized where possible. They include Built-in errors (e. g. zero error, incorrect scale graduation) Experimental errors (due to poor design of the experiment or the apparatus) Systematic human errors (e. g. reading from the wrong side of a liquid meniscus) Loading error (errors introduced as a result of the act of measurement- for example, the temperature of a probe altering the temperature of the body being measured)Errors may also be described in a number of slipway Actual difference the difference between the indicated value (the value indicated by the gauge or sensor) and the actual scale reading (the true value of the property being measured). The actual value must be known to calculate the actual difference. Accuracy the maximum amount by which the results vary from the actual value. The actual value must be known. Percentage accuracy of the actual scale reading the greatest difference between the actual value and the indicat ed value, expressed as a percentage of the actual value.The actual value must be known. Percentage accuracy of the full-scale reading (total range of the measurement device) the greatest difference between the actual value and the indicated value, expressed as a percentage of the maximum value of the range being used. The actual value must be known. Mean deviation (or probable error) The absolute deviation of a single result is the difference between a single result, and the average (mean) of several results. The mean deviation is the sum of the absolute deviations divided by their number. The actual value is not required.The mean deviation is an indication of how closely the results agree with each other. 78 Standard deviation (or mean square error) the standard deviation is the square root of the mean of the squares of the deviations (better results are obtained by dividing the sum of the values by the one less than the number of values). This is a common measure of the precise ness of a sample of data- how closely the results agree with each other. The actual value is not required. ADDITIONAL EQUIUPMENT REQUIRED Values for the piston diameter and weight are provided. These may be replaced by your own measurements if desired.The following equipment will be required to do so Vernier callipers or a ruler, to measure the piston diameter A weigh-balance or similar, to measure the piston weight EQUIPMENT SET UP To prime the cylinder, the following procedure should be followed (where this is required in the experiment) Level the apparatus using the adjustable feet. A circular spirit level has been mounted on the base of the dead weight calibrator for this purpose. Check that the drain valve (at the back of the Bourdon gauge base) is closed. Fill the priming vessel with water (purified or de-ionized water is preferable).Fully open the damping valve and the priming valve. With no masses on the piston, slowly draw the piston upwards a distance of approximately 6c m (i. e. a full stroke of the piston). This draws water from the priming vessel into the system. Firmly drive the piston downwards, to expel air from the cylinder back towards the priming vessel. Repeat these two steps until no more bubbles are visible in the system. It may be helpful to raise the central section of the return tube between the manifold block and the priming vessel. This will help to prevent air being drawn back into the system as the piston is raised.Raise the piston close to the top of the cylinder, taking care not to lift it high enough to allow air to enter, then close the priming valve. PROCEDURE This equipment has been designed to operate over a range of pressure from 0 kN/m2 to 200 kN/m2. Exceeding a pressure of 200 kN/m2 may damage the pressure sensors. In order to avoid such damage, DO NOT APPLY CONTINUOUS PRESSURE TO THE 79 TOP OF THE PISTON ROD WHEN THE PRIMING VALVE IS CLOSED except by application of the mass supplied. The following experiments give sugge sted ways in which particular sources of error may be investigated.It is recommended that only one or two be attempted in a single laboratory session, with each being repeated several times, giving multiple samples for the error analysis. Basic Error Analysis The accuracy of the semiconductor calibration may be investigated by performing standard error calculations on the calibrated sensor output, using the results obtained in Experiment P2. If results are not available for analysis, the following procedure should be followed Slowly open the priming valve. Open the valve to its maximum, and check that the damping valve is also fully open.The fluid in the system will now be at approximately atmospheric pressure (it will be slightly higher than atmospheric due to the height of fluid in the reservoir, but this is negligible compared to the range of the sensors). Switch the selector knob on the console to PRESSURE. Turn the ZERO control on the console until the display read zero, to set the first reference point for the sensor calibration. Raise the piston close to the top of the cylinder, taking care not to lift it high enough to allow air to enter, then close the priming valve. Place a large mass on the piston, and calculate the corresponding applied pressure.Spin the piston, and adjust the SPAN control until the sensor output matches the applied pressure, to set the second reference point for the calibration. Remove the masses from the piston. Take a set of readings from the calibrated semiconductor sensor, adding masses to the pan in ? kg increments, and again while decreasing the applied mass. This provides two set of readings for data analysis. The experiment should be repeated to provide further sets of data. Avoidable errors Incorrect use of equipment Level the apparatus using the adjustable feet.A circular spirit level has been mounted on the base of the dead-weight calibrator for this purpose Check that the drain valve (at the back of the Bourdon gauge b ase) is closed, and the damping valve is fully open. 80 Remove the piston from the cylinder, then fill the priming vessel with water (purified or de-ionized water is preferable). Close the priming valve, then replace the piston in the cylinder. Take a set of readings without priming the system first. Random errors Friction effects Prime the system as described in the equipment set up instructions.Tilt the board at an angle of about 5 to 10 degrees. THE EQUIPMENT BASE MUST STILL BE self-coloured AND SECURE. Titling the apparatus in this way will exaggerate any friction effects, as the force applied by the piston will no longer be acting straight downwards on the column of fluids, but will have components acting at right-angles to cylinder wall. Spin the piston. Take one reading while the piston is spinning, then observe the behavior of the needle. Continue to watch the needle as the piston dinero spinning, then make a note of the new gauge reading. Apply masses to the piston in ? k g increments.At each step, spin the piston, note the sensor output, and then take a second reading after the piston stops spinning. Systematic errors Zero error Calibrate the semiconductor pressure sensor, but do not include mass of piston in the applied mass when calculating the applied pressure. Take a set of readings from the calibrated semiconductor sensor over a range of applied masses, now including the piston mass in the applied mass calculation. Human error Take a set or readings from the Bourdon gauge pressure scale, but stand at an angle to the dial face when taking each reading. Keep the same consider angle for each reading.This illustrates the effect of parallax on the readings taken. RESULTS Tabulate your results under the headings on the following page For each result, calculate the absolute difference, ea between indicated value Pi and the applied pressure Pa. 81 Find the maximum absolute difference, the accuracy ea max and use this value and the corresponding indica ted pressure to calculate the % accuracy of actual scale reading and the % accuracy of full-scale reading (use a range of 200 kN/m2). Correlate the data for several test runs, to give a set of indicated pressure readings corresponding to a single applied pressure.Use this correlated data table to calculate the mean of the results, Pmean, the mean deviation, dm, the absolute deviation, da, and the standard deviation, ?. Errors can also be illustrated graphically 85 Piston diameter, d = . m Piston mass, MP = .. kg Experimental conditions Mass Applied Applied Applied Indicated Mean Absolute Standard Actual Accuracy % % Mean on deviation deviation deviation Accuracy Accuracy of mass force pressure pressure difference piston Actual Full result scale scale reading reading Mm dm da PI ea Emax e%a e%f Pmin Ma Fa Pa ? kg) (kg) (kN) (kN/m2) (kN/m2) (kN/m2) (kN/m2) (kN/m2) (kN/m2) 86 Plot a graph of actual pressure against indicated pressure. On the same graph, plot a straight line showing t he actual pressure. This will illustrate three characteristics of the results Deviation of sensor readings from the actual value. Whether any deviation from the true reading is systematic (the graph will be a straight line or a smooth curve) or random (the graph will have no obvious relationship). Precision of the results. Precise results will be close together, not widely scattered. Precise results may still deviate strongly from the actual value.