Simulating Depth Of Field Effects Film Studies Essay

Simulating Depth Of Field Effects Film Studies Essay Depth of field effects: The distance between foreground and background is called depth of field. The depth of field is the distance in front and behind the point of focus. Objects outside of the depth of field are out of focus. In most cases, the depth of field extends one-third of its distance in front of the focal point, and two thirds its distance behind the focal point. Suppose a lens is focused at area, and lens required sharpness at X distance, and the subject is approximately at X distance, now if we move subject sometime near and far away from the camera at same position, than a very minute changes happen to sharpness . So in anywhere not in camera but our eyes also have some zone through which subject is acceptable sharp and that zone itself is the distance between the lens and the subject and that is called depth of field. However, due to limitations in the human eye, subjects that are slightly nearer to the lens and also subjects slightly further from the lens are perceived to be in focus. These below are the factors which affect more and less depth of field effects. More Depth of field effects Less depth of field effects To achieve more depth of field we have to use shorter focal length of lens. To achieve less depth ofd field effects we have to use longer focal length of lens. To achieve more depth of field we have to use small aperture size. To achieve less depth of field we have to use large aperture. Larger acceptable center of confusion (COC). Smaller acceptable center of confusion (COC). Distant plane of critical focus. Close plane of critical focus. Smaller film format. Larger film format. Focus split: Selecting near and far distance which need to be held equally and acceptably in focus and setting the focus distance to suit. Factors affecting Shallow depth of field effects in cameras High contrast lenses have less depth of field effects than the low contrast lens. Consequently, a smaller diameter of center of confusion should be used in depth of field calculation.(eg- 1/2000 instead of 1/1000 ) Lighting which sharply focused details, brightly lighted objects will appear to have less depth of field effects. The use of lens filter in between the lens and the subject, which will reduces maximum definition and make a greater degree of soft focus. As usual but very common, depth of field effects situation arises with uses of wide angle lens at moderate focus distance.( for e.g. 3ft to 12 ft) Object at infinity: This is occur especially when photographed using long focal length lens( more than 55 mm lenses) trend to appear tend to appear soft because of atmospheric elements(like moisture, smoke, dust, haze, smog). There is solution too for such situation that is only either use HAZE filters available in market or using light yellow filters to increase contrast and sharpness in film. This affects when you filming or photographing in any hilly area, mountain area, beaches, waterfall, or any natural area sometime forest too). In case of shutter release Priority: A fast shutter speed used in photography in order to capture fast moving object( e.g. like if you want to take a shot of moving car), whereas a slow shutter speed used to create blur effects on fast moving object( for e.g. a fast moving car in night and you want to capture back light of car as beam using slow shutter speed) , so therefore a fast shutter speed requires a larger aperture size lets say (f1/16or f/11 ) which allow small amount of light to enter the lens hence it extended depth of field effects and in case of slow shutter speed requires small aperture lets say (f2.8, or f2) which allow more light to enter the camera and hence it produce shallow depth of field effects. When aperture is more open than it allows more light to enter the camera and fall on camera CCD, hence to control amount of light we need a more shutter speed to accumulate and to prevent the photograph from over exposed. A telephoto lens gives you a narrow depth of field effects, by moving a lens as close as to the subject and use largest aperture size of camera lens, while to get the large depth of field use Wide angle lens and move your camera and lens as far as possible and use small aperture size. The degree of magnification that the image may be subjected to when shown or projected close or near to the audience sheet to the screen. I mean to say that when Audience close to a cinema screen will be more aware of soft focus than those who are far away from the cinema screen. Focus Bias: This can occur when one subject is in focus and rest is in out of focus like in case of macro photography with small aperture and long focal length for eg a 200 mm lens with aperture value of 2.8 or 2.0. Effects of aperture and the depth of field: The depth of field effects is being controlled by lens aperture value. If you increase the f-number than depth of field effects also increased but decrease the amount of light entering to the camera and when you decrease the f-number than depth of field effects also decreased (it gives shallow depth of field effect). In motion picture its very limited use of it. Generally cinematographer take a single aperture settings for a shot and for another shot they choose another setting as par locality and they adjust exposure settings with the help of light meter device which tells actuall amount of light presents in that area. Aperture settings and exposure settings are changed more frequently in still cameras than motion picture cameras. In photography and cinematography, variation in depth of field effects used to create various kinds of special effects. Camera movement and the depth of field effects: In film making, a person who looks and takes care of responsibility of lens changing, filter changing, point to focus, maintaining depth of field, setting focal length is known as focus-puller. Focus-puller is one of the assistant person in shooting crew members or camera man. A good focus-puller has very adequate and vast knowledge of cinematography. He has to focus and shift focus smoothly in such a manner that audience cant find jerk on them. In film industry most hard job is of focus puller. He has to perform his duty very accurately because suppose if any role given to actor to act on that, and he done that, but while recording focus puller didnt check focal length and filter than actor has to act again. Doing reshot is tough to achieve same expression what he achieved in previous shot. So this was example how much focus puller important to the cinematography. His work is more technical rather than creative. He has to keep in mind all the guidelines given by the director of phot ography during shooting a shot. Cameras depth of field limits The sharpness of depth of field can be increased by decreasing by Center of confusion, but its not as easy to decrease because it also has some disadvantage that is motion blur and diffraction. As we know center of confusion has inversely relation with f-number like a smaller center of confusion need a greater f number, but need a long exposure time. if we increase f-number than diffraction also increases which will soften or soft all the part of image, thus image will no longer be in sharp. The f-number which will overcome from center of confusion is the minimum acceptable sharpness value. If we increase f- number than the sharpness at limited depth of field improved. As we know there is also maximum f-numbers through which sharpness of depth of field in image gets over. The best f-number should be chosen in between of minimum and maximum f-numbers. Depth of field and Macro or close-up: One of the main difficulties with close-up photography is that keeping the image enough in focus. The closer the lens focuses, the less depth of field you have. When using a macro lens at its maximum magnification, depth of field may only extend a fraction of an inch. With floral close-ups, a small aperture is almost always needed, but even so, it is important that the lens focuses on a key focal point in the composition, since not in the entire frame. Depth of field and shooting on bright hot afternoon: While shooting at outdoor especially in day light, the director of photography may wish to reduce amount of light and the depth of field for a close-up shot. For reducing light, a very good filter available called neutral density filter commonly known as ND filter. Suppose the light meter indicating F/22 but we have till f/16, than ND filter play a very important role. This will reduce the amount of light entering to the camera and enable you to shoot on bright sunny day. On other case, if the director of photography wants a close-up shot, and you have to reduce your depth of field, because by reducing depth of field, it will out of focused the background and puts more importance to the subject or highlight the subject. Circle of confusion While shooting the film, the focus puller must be know that which part of scene should be sharp, so therefore we need something to measure the sharpness of image in relative to film limits of the eyes resolution at the time of viewing or at time of projection on screen. For example: if a image is captured through 35 mm film projected at theater, audience must be at distance of 1/3 back from screen. Now we know that eye resolving power is 1 minute of arc. From audience I mean 1/3 back from screen, the smallest size of a dot appearing on a screen which is in perfectly focused or sharp. Now we can easily measures the distance between audience and the screen through any inch tape, from screen the previous sharpen dot which appeared smallest at back now that will be largest dot from the screen, the arc of 1 minute comes up with physical dimension on the screen for the largest dot that the audience previously seen as a smaller sharp point. Figure 1 (need to put a diagram over here) Now the diameter of dot on screen is not actual size of dot, to find actual size of dot we have to calculate diameter of big dot appearing on screen, than we have to divide with enlargement factor needs to bring the size of our 33 mm film up to size of our cinema screen or projected area. This will bring the size of maximum or big dot. When lens is focused at infinity: If any point is focused from the infinity, the distance between plane of focus and the lens become the focal length of the lens. How image size varies at different points behind the camera lens: Figure 2 (need to put a diagram over here) You can see the image is not at extract plane of focus. The image was there somewhere after plane of focus. So in this case size the dot size forming big. Now imagine if the audience sees this dot size sharpen, clearly in focus, than we can easily calculate the amount of sharpness in which part of overall image looks sharp. Near and far points of focus: Figure 3 (need to put a diagram over here) In this case point B creating a sharp image on image plane or plane of focus, while point A creating image after crossing image plane or plane of focus, which means out of focus or blur or less sharpen image. Conclusion: In film plane, both near object and far away object (Lets take Point A and Point B) expanded and become confused to larger dot than the original dot. Hence this is the circle of confusion. Figure 4 (need to put a diagram over here) Thus, a center of confusion (COC) is the diameter of largest dot which is still considers being sharp, focused, and also seen by the audience in Film Theater when it projected on screen. Focus Split: Focus split is selecting the near and far distance which need to be held equally and acceptably in-focus and setting the focus distance to suit. Lets take x as the distance of near object from the camera lens Lets take y as the distance of far away object from the camera lens Than what could be the focus area? Hyper focal Distance: Hyper focal distance is maximum depth of field that starts from infinity to the camera. If a lens is set to hyper focal distance, than the depth of field effects is half of hyper focal distance from infinity. Hyper focal distance is the distance in which lens is focused at infinity, so that the object in background and foreground both will be at sharper focused. Hyper focal distance depends on many factors, some of like Focal length of the camera lens The aperture f- value Diameter of circle of confusion Hyper Focal distance = (FL2) f X COC Where FL means focal length, f-number means aperture size and COC means circle of confusion After knowing hyper focal distance, its easy to calculate near and far point Near point depth of field = H X S H+(S-F) Far point depth of field = H X S H-(S-F) Where H = Hyper focal distance value S = Distance from camera to the subject F = Focal length of camera lens COC = Circle of confusion Focus Bias: Focus bias occurs when one object is in focus and rest is in out of focus (for e.g like in case of macro photography, with larger aperture and longh focal length, i.e f 2.8 with 200 mm focal length) In cinematography, focus plane yet depth of field effects is calculated using the entrance puple position of

First Aid

INTRODUCTION First aid is the immediate assistance or treatment given to someone injured or suddenly taken ill before the arrival of an ambulance, doctor, or other appropriate qualified persons. It is a skill, based on knowledge, training and experience. First aid training is important as it is relevant at home, work place or industries and any other place. The term â€Å"FIRST AIDER† is usually applied to someone who has completed a theoretical and practical instruction course, and passed a professionally supervised examination. The standard first aid certificate awarded by St John Ambulance, St Andrews Ambulance Association and the British Red Cross is proof of all round competence. First aid must be administered as soon as possible. In case of critical injury, a few minutes can make the difference between complete recovery and loss of life. First aid requires rapid assessment of victims to determine whether life threatening conditions exists. First aid measures depend on the victims need and the provider’s level of knowledge and skill. Knowing what not to do in an emergency is as important as knowing what to do. DEFINITION OF TERMS FIRST AIDER: someone who has completed a theoretical and practical instruction course, and passed a professionally supervised examination. EMERGENCY: A serious, unexpected and potentially dangerous situation requiring immediate action or an unexpected event that must be dealt with urgently. CASUALTY: somebody who has a fatal accident, or receives a serious injury or suddenly falls ill. ACCIDENT: An unpleasant incident that happens unexpectedly. INCIDENT: An event, the occurrence of dangerous or exciting event. AMBULANCE: A vehicle for taking sick or injured people to and from hospital. HOSPITAL: An institution providing medical treatment and nursing care for sick or injured people. IMMOBILIZE: Prevent from moving or operating as normal. SIGN: What you see on the casualty. SYMPTOMS: What the casualty feels and tells you. FIRST AID DEFINITION: – immediate assistance or treatment given to an injured person or someone who suddenly falls ill before the arrival of an ambulance, doctor, or other appropriate qualified persons. It is also the first care given to a casualty or someone who suddenly falls ill before the arrival of a doctor or before taking the person to the hospital. AIMS AND OBJECTIVE OF FIRST AID †¢To save life. †¢To promote quick recovery. †¢To prevent the situation from getting worse †¢To save time. †¢To save cost. PRINCIPLES OF FIRST AID The golden rule is ‘’ first do no harm’’ while applying the principle of calculated risk. You should use treatment that is most likely to be beneficial to a casualty but do not use a doubtful treatment just for the sake of doing something. Assess the situation ?Observe what has happened quickly and calmly. ?Look for dangers to yourself and to the casualty. ?Never put yourself at risk. Make area safe. Protect the casualty from danger. ?Be aware of your limitations. Assess all casualties and give emergency aid ?Assess each casualty to determine treatment priorities, and treat those with life-threatening conditions first. Get help ?Quickly ensure that any necessary specialist has been summoned and is on the way QUALITIES OF A GOOD FIRST AIDER †¢Be resourc eful at all times. †¢Be sympathetic and empathetic to your casualty. †¢Be smart and confident. †¢Be observant. †¢Be bold. †¢Be gentle SCOPE OF FIRST AID This is the systematic way of administering first aid;- DIAGNOSIS:- †¢History Signs †¢Symptoms CARE:- This should be given in order of priority i. e. breathing, bleeding, burns and broken bones Transportation- Arrange to convey the casualty without delay to his home, suitable shelter, hospital and or summon a doctor in any serious case. EMERGENCY RESPONSE This is another procedure taken to ensure that appropriate first aid and safety is observed while assisting a casualty. When to use it depends on the situation you find yourself. D – Danger. R – Response (A. V. P. U. i. e. Alert, voice, pain, unresponsive). A – Airway. B –Breathing (L. L. F i. e. ook, listen and feel). C -circulation THE RESUSCITATION SEQUENCE To assess and treat a casualty who has collapse use the resu scitation techniques, obtained on the following pages. If breathing and pulse return at any points place the casualty in a recovery position. The resuscitation sequence Check response ? Open airway and check breathing ? Breathe for the casualty ? Assess for circulation ? commence CPR. CHECKING RESPONSE On discovering a casualty, you should first establish whether the casualty is conscious or unconscious. Ask a simple question such as ‘’hello can you hear me’’. ’What has happened to you’’. or give a command such as’’ open your eyes’’. Speak loudly and clearly, close to the casualty’s ear. OPEN THE AIRWAY An unconscious casualty’s airway may become narrowed or blocked. This makes breathing difficult and noisy or completely impossible. The main reason for this is that muscular control in the throat is lost, which allows the tongue to fall back and block the airway. Lifting the chin and tilting the head back lifts the tongue away from the entrance to the air passage, allowing the casualty to breathe. To open the airway – Place two fingers under the point of the casualty’s chin lift the jaw. At the same time, place your other hand on the casualty’s forehead and gently tilt the head well back. CHECKING BREATHING ?Kneel besides the casualty and put your face close to his mouth. ?Look, listen and feel for breathing. ?Look along the chest to see if the chest rises and falls, indicating breathing. ?Listen for sounds of breathing. ?Feel for breath on your cheek. ?Do these checks for up to ten seconds before deciding that breathing is absent. BREATHE FOR THE CASUALTY )Look into the mouth and remove any obvious obstruction including broken or displaced dentures from the mouth. Leave well fitted dentures in place. 2)Open the airway by tilting the head and using two fingers to lift the chin. 3)Close the casualty’s nose by pinching it with your index finger and thumbs. Take a full breathe and place your lips around his mouth, making a good seal. 4)Blow into your casualty’s mouth until you see the chest rise. Take about two seconds for full inflation. 5)Remove your lips and allow the chest to fall fully, which takes about four seconds. Repeat this once and then assess for signs of circulation. If pulse is absent and there are no sign of recovery such as any movement, swallowing, coughing or breathing, begin cardio pulmonary resuscitation. If breathing returns, place the casualty in the recovery position. ASSESSING FOR CIRCULATION Check the pulse for up to ten seconds, during which, look for other signs of recovery such as movement, breathing, swallowing and coughing. If you cannot find the pulse or there are no other signs of circulation, Begin chest compressions immediately. CARDIOPULMONARY RESUSCITATION (CPR) If there is no pulse, this means that the heart has stopped beating and you will have to provide an artificial circulation by means of chest compression. To be of any use, this process must always be combined with artificial ventilation. This procedure is known as Cardio-Pulmonary Resuscitation or CPR for short. If both you and your helper have been trained to administer C. P. R, you can do so together. GIVING CHEST COMPRESSIONS ?Kneel beside the casualty locate one of his lowermost ribs with the index and middle finger. Slide your finger along the ribs to the point where lowermost ribs meet at the breast bone. Place the heel of your other hand on the breast bone and slide it down until it reaches your index finger. This is the point at which you should apply pressure. ?Place the heel of your first hand on top of the other hand and inter lock your fingers. ?Leaning well over the casualty with your arms straight, press vertically down and depress the breast bone approximately 4-5cm, r elease the pressure without removing your hands. Compress the chest 30 times aiming for a rate of about 100 compressions per minute. Then give two artificial ventilations. Continue this cycle of alternating 30 chest compressions with two breaths of artificial ventilation until help arrives. CPR FOR A CHILD AND A BABY The same resuscitation sequence is applicable for a child but alternate five chest compressions with one breath of artificial ventilation. For one minute before calling an ambulance. Position your hand as you would for an adult but use heel of one hand only. For a baby under one year, place the tip of finger on the lower breast bone. Do this five times at a rate of 100 per minute Give one full breath of artificial ventilation, by breathing into the baby’s mouth and nose.

The Symbolic Briefcase in Ralph Ellison’s Invisible Man...

The Symbolic Briefcase in Ralph Ellison’s Invisible Man The narrator of Ralph Ellison’s Invisible Man is the victim of his own naivetà ©. Throughout the novel he trusts that various people and groups are helping him when in reality they are using him for their own benefit. They give him the illusion that he is useful and important, all the while running him in circles. Ellison uses much symbolism in his book, some blatant and some hard to perceive, but nothing embodies the oppression and deception of the white hierarchy surrounding him better than his treasured briefcase, one of the most important symbols in the book. The briefcase is introduced in the very first chapter. The narrator receives it after giving a speech endorsing†¦show more content†¦No matter where it sends him, for as long as the narrator carries that briefcase, he is jerked around like a puppet on a string, kept running by all those for whom that message was meant. As the story progresses, it becomes clear that the items the narrator stores in the briefcase are just as important and telling as the briefcase itself. First, there are Bledsoe’s letters. Bledsoe, the president of the college, expels the narrator, telling him to go to New York City to find work. He gives the narrator letters of recommendation and promises that he can return to the college after the summer. The narrator optimistically stuffs the letters into his briefcase and journeys to New York only to find himself ignored by the men for whom the letters are intended. After delivering his last letter, he discovers the truth of Bledsoe’s â€Å"recommendation.† Bledsoe has written in each letter that the narrator shall â€Å"never, under any circumstances, be enrolled as a student here again† (190). He also writes to ask â€Å"that he continue undisturbed in these vain hopes while remaining as far as possible from our midst† (191). The narrator disc overs that Bledsoe’s letters were only meant to keep him chasing his own tail. Another item the narrator stores in his briefcase is a coin bank. Right before he is about to leave Mary (the kind lady who gives him refuge in New York) to join the Brotherhood, the narrator notices a â€Å"cast-iron figureShow MoreRelatedEssay on Use of the Bird Motif in Invisible Man2374 Words   |  10 PagesUse of the Bird Motif in Invisible Man      Ã‚  Ã‚   Abstract: According to A Handbook to Literature, motif refers to a recurrent repetition of some word, phrase, situation, or idea, such as tends to unify a work through its power to recall earlier occurrences (264). One such type of motif which has seemed to receive less critical attention is Ellisons treatment of birds.  Ã‚   Hence, my aim in this essay is to examine the references to birds in Invisible Man, attempting to show how Ellison uses theRead MoreBiographical Information : Ralph Waldo Ellison1960 Words   |  8 PagesBiographical Information: Ralph Waldo Ellison was born in Oklahoma City, Oklahoma on March 1, 1914. He passed away on April 16, 1994 in New York, New York. The Book Invisible Man Published in 1952 focused on an African-American civil rights worker from the South who, upon his move to New York, becomes increasingly alienated due to the racism he encounters. The narrator seeks to act according to the values and expectations of his immediate social group, but he finds himself continuously unable toRead More Invisible Man Essay: The Phases of Invisibility2008 Words   |  9 PagesInvisibility in Invisible Man      Ã‚  Ã‚  Ã‚  Ã‚   To be invisible is to be unable to be seen by anyone without artificial aid.   The invisible man is more impossible to locate than the proverbial needle in a haystack.   In Ralph Ellisons Invisible Man, the main character, I., progresses through various phases of symbolic invisibility.      The story begins with I. recounting the various steps and incidents that led him to realize his invisibility.   I.s grandfather was a meek and humble man, and thereforeRead MoreThe Harlem Renaissance And Its Impact On Ralph Ellison s Book The Invisible Man Essay2165 Words   |  9 Pagesimpact on Ralph Ellison’s book The Invisible Man. This paper will illustrate how the Harlem Renaissance assisted the African-American intellectual community to gain acceptance in mainstream America and prompted the writing of the book The Invisible Man, written by Ralph Ellison. Throughout this paper, I will examine the social context and climate of Ellison’s work. This paper will focus on the experience of a young African American man who claims to be invisible. However, the young man argues that

The Pros And Cons Of Gun Control - 897 Words

Gun control is an on going debated rather guns should be allowed or to be banned. Gun control, politics, legislation, and enforcement of measures intended to restrict access to, the possession of, or the use of arms, particularly firearms. Gun control is one of the most controversial and emotional issues in many countries, with the debate often centring on whether regulations on an individual’s right to arms are an undue restriction on liberty and whether there is a correlation between guns and crime. Proponents of gun-control legislation assert that the strict enforcement of gun-control laws saves lives and reduces crime. By contrast, opponents of gun control assert that minimal restrictions on guns ensure that individuals have adequate†¦show more content†¦This law would remain in effect until Julius Caesar violated it when he maintained a standing army to assume power as emperor of Rome, a historical event that was etched as the beginning of the decline of the Roman Empire. In fact, this historical event is of such significance that both the En glish Bill of Rights (formally An Act Declaring the Rights and Liberties of the Subject and Settling the Succession of the Crown; 1689) and the U.S. Constitution (1789) include provisions that prevent the maintenance of standing armies during times of peace without the consent of the legislative branch. Similar to the practices in England, the American colonies had numerous gun-control laws concerning safety, crime, hunting, the common defense, and even slaves. Despite those similarities, the American colonies diverged from England’s gun-control laws in two respects. First, outside of the restrictions imposed upon slaves, the American colonies did not restrict the use, ownership, and possession of guns based upon socioeconomic status. Second, the American colonies did not prescribe to a select militia based upon class. 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Drug Abuse, Addiction And Policy - 971 Words

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Turnitin Hypocrisy of Its Own Free Essays

Over the centuries, teachers and professors all have had a problem with academic dishonesty. The advancement in technology has made plagiarizing so much easier, and because of this, many professors have resorted to using software programs which detects any sort of plagiarism. One popular program many professors are enforcing their students to use is Turnitin. We will write a custom essay sample on Turnitin: Hypocrisy of Its Own or any similar topic only for you Order Now com. When a paper is submitted into Turnitin, the program compares it to previous submitted essays saved in its database and the content available on the internet.However, in recent years, there has been much controversy between the ethics of Turnitin and student’s rights. According to Merriam-Webster, plagiarizing is defined as, â€Å"to steal and pass off (the ideas or words of another) as one’s own, without crediting the source† (1). Whenever a thought comes to mind, it is highly unlikely the first time the person has encountered this â€Å"newfound† idea. Books, classes, and conversations with others integrate and become an essential part of the thought process and the fine line between plagiarism and thought becomes slightly unclear.Every class a student takes focus on the concept of when using another’s work, you must always give credit to the owner; otherwise, you have committed plagiarism. The focus on crediting becomes stricter as students take higher level classes as they prepare for and enter the real world. Although students know that cheating has heavy consequences—receiving an F in the course, or worse, expulsion from school—some may take the risk if they believe that the benefit of receiving a higher grade may outweigh the potential consequences.Plagiarism had been limited by availability of information in newspapers, books, or libraries in the past. Today, with the advancement in technology, students now have access to the internet which contains a wealth of limitless information, making plagiarism ev er so easy, one-click-away. Because of this, many professors have felt the need to be proactive and fight back with technology in order to prevent plagiarism. One popular plagiarizing detection program many schools and universities are using is Turnitin. com.As soon as a student submits an electronic copy of their work, the website compares it with resources found online and files from its extensive database and produces an originality report. Teachers believe that anti-plagiarizing software programs such as Turnitin is a way to deter and, possibly, catch students if they plagiarized Conversely, Turnitin is a major contradiction itself. In Bill Walsh’s article, â€Å"Expect, but Respect, Original Work by Students,† he points out the hypocrisy of Turnitin lies in what it is presumably trying to prevent and teach.He states that Turnitin, â€Å"is actually infringing on the students’ intellectual property, making money from it, and violating the very copyright laws Turnitin is supposed to be protecting† (Walsh 568). Every time a paper is submitted into Turnitin, the student unknowingly fuels its database and helps the website run more efficiently. In order to make a database, Turnitin has to save a copy of the student’s intellectual work; if the student has not given authorization, then Turnitin, hypocritically, is potentially violating copyright infringement laws.Without the extensive database of submitted papers, Turnitin will be merely just a simple search engine such as Google. Every single paper that is submitted to the site gets added to the database increases the value of their product and what they have to offer. The website asserts complete ownership and access to every paper and assignment that is submitted in to their site; this allows the company to generate a revenue of â€Å"tens of millions of dollars annually† (Walsh 568) without giving the authors any compensation or credit.Without giving any credit or compensation to the owners of that intellectual property, Turnitin has contradicted its business model and has become its own hypocrite. Besides academic learning, education also teaches students about the value of academic integrity. Donald L. McCabe explains in his essay that, â€Å"integrity cannot be divided†¦ college teaches values to students by the standards they set for themselves†( McCabe 575). Since childhood, students are instilled with the negative connotation associated with cheating.They learn that it is unfair to other students around and there are heavy consequences which can include failing the course, or worse, expulsion from the school. Students also learn that when they cheat, they often they not only end up cheating themselves out of a learning experience, but they also lose their sense of academic integrity as well as their professor’s trust. However, when professors enforce their students to use Turnitin, a program that is clearly is its own hypocrite, they devalue academic integrity.When the education system place so much emphasis on the importance of academic honesty and then enforces students to use Turnitin, a business built on a foundation of the usage of unauthorized work of students, they show students that they support a business which goes against the very standards in which they value. The author suggests that, â€Å"its time to abandon [their] almost exclusive reliance on deterrence and punishment and to look at the issue of academic dishonesty as an educational opportunity as well† (McCabe 576). When professors and schools force students to use programs such as Turnitin, they are clearly sending out a message which states, â€Å"guilty-until-proven-innocent. † By asking students to use Turnitin, professors are assuming that most students are going to cheat and plagiarize their papers in some way and it creates a â€Å"culture of mistrust, a culture of guilt† (Rawe 570). Ethics in education should always include a magnitude of trust, so when professors presume students to all have plagiarized until a software program proves otherwise, it violates this code.This not only creates a feeling of mistrust amongst students and professors, this also goes against our American rights—innocent until proven guilty. Instead of using anti-plagiarizing programs such as Turnitin to catch or discourage students from cheating, schools should focus more on the ethics in academic integrity, and possibly expand the â€Å"honor code by obligating students to take action of th ey observe or hear about cheating†(Rawe 570); by doing so will ensue an ethical education formally based upon academic integrity.Plagiarism is a behavior of academic misconduct that violates the importance of academic integrity and definitely should not be acceptable. Many schools have resorted to using Turnitin as a convenient way to prevent and detect plagiarism. However, when schools decide to use a program that uses student’s intellectual work in order to make a hefty profit without offering compensation, permission, or acknowledgment to the student, they support a company which goes against all of the fundamental elements they have tried protect and instill into the education system regarding academic integrity.And when schools still choose to sacrifice student intellectual property in order to prevent plagiarism, the trust code between professors and students becomes violated, and academic integrity will cease to exist.Works Cited 1. â€Å"Plagiarizing. †Ã‚  Merriam-Webster Online Dictionary. 2010. http://www. merriam-webster. com/dictionary/plagiarizing? show=0;t=1284692767(14 Sept. 2010). 2. Walsh, Bill. â€Å"Expect, but Respect, Original Work by How to cite Turnitin: Hypocrisy of Its Own, Papers

Mechanical Engineering free essay sample

Plain carbon steel is essentially an alloy of iron and carbon which also contains manganese and a variety of residual elements. These residual elements were either present within the raw materials used in the production process e. g. iron ore and scrap steel additions, or they were added in the production process for a specific purpose, e. g. deoxidization by means of silicon or aluminium. Hence they are called residual elements to distinguish them from alloying elements that are deliberately added according to specified minimum amounts. The term â€Å"cleanliness† refers to the amounts of various phases such as oxides, sulphides and silicates that can be present in steel. The smaller the amount of these phases, the cleaner the steel. For many years steels have been produced by casting the molten steel into moulds and allowing it to solidify into ingots which were then processed by rolling etc. steel produced by ingots is subdivided into four categories according to the deoxidization process used. We will write a custom essay sample on Mechanical Engineering or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page These categories are rimmed, capped, semi-killed and killed steel. When un-deoxidized steel is cast into an ingot, carbon monoxide is evolved during solidification because the solubility of oxygen decreases as the temperature decreases. 1b) Steels that contain specified amounts of alloying elements, other than carbon and the commonly accepted amounts of manganese, copper, silicon, sulphur and phosphorus are known as alloy steels. Alloying elements are added to change mechanical or physical properties. Alloy steels are melted together in an electric furnace. This step usually involves 8 to 12 hours of intense heat. Next, the mixture is cast into one of several shapes including blooms, billets and slabs. After various forming steps, the steel is heat treated and then cleaned and polished to give it the desired finish. The semi-finished steel goes through forming operations, beginning with hot rolling, in which the steel is heated and passed through huge rolls. After the steel is formed, most types must go through an annealing step. Annealing is a heat treatment in which the steel is heated and cooled under controlled conditions to relieve internal stresses and soften the metal. Some steels are heat treated for higher strength. However, heat treatment requires careful control, for even small changes from the recommended temperature, time, or cooling rate can seriously affect the properties. 1c) Plain carbon steel is used in many industries such as in the construction of roads, railways, infrastructures, appliances, and buildings. Carbon steel is used to erect a strong and lasting frame to most modern buildings, steel beams (girders), joists and studs are engineered to create the skeleton of a building. Steel is also used in a variety of construction materials, such as pipes, tubing, plates, bolts, nails, screws and equipment like tools, bulldozers, cranes etc. 1d) In the construction industry, gears, pipes, beams, w shape beams , boilers, pressure valves and other things are fabricated from alloy steels. By coupling additional elements to the carbon and iron based building metal you can strengthen it to withstand quite a bit more. Alloy steels can be non-magnetic, high-quality, and corrosion-proof. Furthermore they can be used in highly demanding applications such as commercial steel buildings, turbine blades in jet engines, spacecrafts and nuclear reactors. Stainless steel is the most widely known alloy steel. What distinguishes stainless steel from carbon steels is that it contains a minimum of 10% chromium. As a consequence, stainless steel building metal is resistant to staining, and is rust proof, which makes it perfect for cooking utensils, cutlery, jewelry as well as aircraft parts, architectural components, and surgical implements. 2) In the production of aluminium, first the ore is mixed with a hot concentrated solution of sodium hydroxide. The NaOH will dissolve the oxides of aluminium and silicon but not other impurities such as iron oxides, which remains insoluble. The insoluble materials are removed by filtration. The solution which now contains the oxides of aluminium and silicon are next treated by bubbling carbon dioxide gas through the solution. Carbon dioxide forms a weak acid solution of carbonic acid which neutralizes the sodium hydroxide from the first treatment. This neutralization selectively precipitates the aluminium oxide, but leaves the silicates in solution. Again filtration is used for the separation. After this stage the purified aluminium oxide is heated to evaporate the water. The molten mixture is then electrolysed with a very large current and the aluminium ions are reduced to form aluminium metal The physical properties of aluminium make it a perfect material for construction. Its light weight means that the load on the bearing structure is less, and its strength makes it suitable for a great variety of solutions. Its resistance to corrosion gives it special advantages: aluminium is perfect for regions with severe weather conditions. Finally, its fluidity gives freedom to architects and designers. Aluminium extruded, rolled and cast products are commonly used for window frames and other glazed structures ranging from shop fronts to large roof superstructures for shopping centres and stadiums, for roofing, siding and curtain walling as well as for cast door handles, catches for windows, staircases, heating and air-conditioning systems, power lines and the list goes on. 3) Plastics are produced using a process called polymerization, where many thousands of monomers are joined together to form a polymer chain. Monomers are made of atoms like chlorine, nitrogen, oxygen, hydrogen and sulphur. Monomers are easily extracted from abundant organic. There are two main types of plastics, thermosetting plastics and thermoplastics. Both are produced by pouring liquid monomers into a mould where they undergo polymerization. Thermosetting plastics are permanent once moulded, they do not deform under heat. Thermoplastics will melt under heat can be reformed repeatedly. The polymerization process increases the molecular weight of the constituent molecules, turning liquid monomers into solid polymers. (Increase of molecular weight causes the substance to undergo a phase change). During the moulding process, the monomer soup is superheated and condensed under many atmospheres worth of pressure. This causes polymerization to occur and ensures that the plastic is solid and uniform, lacking any internal air bubbles. Specialist plastic and rubber fabrications are used in a wide variety of industries including, civil engineering, medical, aerospace, military, atomic energy, marine and automotive. Many products are used to contain aggressive chemicals which could be hazardous if not properly controlled. Furthermore the uses and advantages of plastics and rubbers are endless throughout the industries, some examples of these are, sealing, jointing and finishing products, containing applications, bio-degradable applications, hoses, wheels, profiles and consumables. 4a) Welding is a fabrication process that joins materials, usually metals or thermoplastics by causing coalescence. This is often done by heating the work pieces and adding a material to form a pool of molten material that cools to become a strong joint, but sometimes pressure is used in conjunction with heat or by itself to produce the weld. This is in contrast with soldering and brazing, which involves melting a lower-melting point material between the work pieces to form a bond between them. Many different energy sources can be used for welding, including a gas flame (oxy-acetylene), an electric arc, a laser, an electron beam, friction and ultrasound. While often an industrial process, welding can be done in man different environments including open air and under water. Welding is generally the simplest, fastest, and most cost-effective method, at least in the case of structural metals. Welding doesnt require parts to fit exactly. Methods like bolts or screws require some type of flange or overlap of parts, so with welding, weight and material savings can be realized. A high quality weld can often be stronger than the parts to be joined, though this should not be depended on. 4b) Welding, without the proper precautions, can be a dangerous and unhealthy practice. However, with the use of new technology and proper protection, the risks of injury and death associated with welding can be greatly reduced. Because many common welding procedures involve an open electric arc or flame, the risk of burns is significant. To prevent them, welders wear protective clothing in the form of heavy leather gloves and protective long sleeve jackets to avoid exposure to extreme heat and flames. Additionally, the brightness of the weld area leads to a condition called arc eye in which ultraviolet light causes the inflammation of the cornea and can burn the retinas of the eyes. Goggles and helmets with dark face plates are worn to prevent this exposure, and in recent years, new helmet models have been produced that feature a face plate that self-darkens upon exposure to high amounts of UV light. To protect bystanders, transparent welding curtains often surround the welding area. These curtains, made of a polyvinyl chloride plastic film, shield nearby workers from exposure to the UV light from the electric arc, but should not be used to replace the filter glass used in helmets. Welders are also often exposed to dangerous gases and particulate matter. Processes like flux-cored arc welding and shielded metal arc welding produce smoke containing particles of various types of oxides. The size of the particles in question tends to influence the toxicity of the fumes, with smaller particles presenting a greater danger. Additionally, many processes produce various gases, most commonly carbon dioxide and ozone, and fumes that can prove dangerous if ventilation is inadequate. Furthermore, because the use of compressed gases and flames in many welding processes pose an explosion and fire risk, some common precautions include limiting the amount of oxygen in the air and keeping combustible materials away from the workplace. 4d) Pipe Cutters A tubing or pipe cutter is a hand tool specifically designed to cut pipe. It works by clamping onto a portion of the pipe and cutting through it using a small, round blade. As the tool is rotated it tightens, causing the blade to slowly dig into the pipe, eventually sawing all the way through. Tubing and pipe cutters are easy to use and provide a straight cut and edge to weld. Pipe Clamps For clamping pipelines on the outside whilst welding is taking place on straight sections, pipeline flanges or bends. Various types of external pipe clamps are suited to different applications. Chain clamps are extremely versatile for holding pipes up to 54 suitable for elbows, tees, flanges, end caps and most other pipe fittings. Ratchet Line-up cage clamps are very strong and accurate, but are also lightweight with either standard flat cross bars or no tack arched cross bars. External Hydraulic (no tack) Line-up cage clamps lines up pipe for welding to enable the maximum weld to be made without moving the clamp and comes with hand toggle or powerful hydraulic for accurate alignment. JA Type Mechanical Pipe Clamps allow efficient preparation of welding, whilst allowing easy handling but at the same time optimized working security, ensuring safety and peace of mind. 5a) Stress is the internal resistance, or counterforce, of a material to the distorting effects of an external force or load. Mechanical Engineering free essay sample Mechanical engineering, or MEs, jobs are exciting, challenging, and rewarding, but also due to there being a high demand for licensed engineers, this being a stable career with a bright future, and income being above average, this has been a popular career choice for a long time. In fact, mechanical engineering is one of the oldest engineering disciplines in existence, as well as one of the most respected. Mechanical Engineers, or MEs, take an idea of a product and introduce it into the marketplace with great knowledge of the materials and research (Career opportunities, 2012). Mechanical engineering is a field that takes a certain kind of person that has special skills in math, physics, and design. It is best for a student to start taking classes while still in high school. When a person starts college as a freshman there are certain prerequisites that must be taken during their high school years, such as studying algebra for two years, and one year each of chemistry, physics, and trigonometry. We will write a custom essay sample on Mechanical Engineering or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Starting these studies early on would be beneficial for the time it will take a person to earn a degree in college (Key elements, 2012). Other criteria’s should be met for the mechanical engineering program, such as the ACT scores. ACT scores should be, at a minimum of 26 in math. It is also, important to find a school that will prepare a person to earn the degree employers are looking for. At minimum, employers will be looking for in a successful student, is a Bachelor’s degree. Students can secure a job with only a two-year Associates’ degree, but finding employment could be a challenge. The only advantage to this degree would be to work under someone and get the hands on experience from it (Key elements, 2012). A more dvanced degree would be a Master’s degree, and a Doctoral Degree (PhD) in Mechanical Engineering. Out of these two degrees, a student would have higher demand in career opportunities, and a higher pay salary (Key elements, 2012). Mechanical engineering comes with many job descriptions, and the title has been around for a long time. Out of all engineering careers, mechanical offers the most opportunity (Overview, 2012). When interviewing Jim Smith, who is a Mechanical project engineer, he said, he has been in the engineering field for six years and has moved up to a design team leader. Mechanical engineering has an array of areas to concentrate on, transportation, working with the environment, computers, biomedical, fuels, and nuclear power are just a few to choose from. Being an engineer will require working one on one, or working in a team environment; Depending on the size of the company. Some areas focus on research and laboratory work. In a minimal situation, a mechanical engineer description could be just using math skills to design a product (Overview, 2012). â€Å"In 2002, mechanical engineers had around 215,000 jobs. The employment of mechanical engineers is expected to be on the rise through 2012. With all the new machinery, mechanical engineers will have further jobs available to them (Mechanical engineering careers, 2012). The earnings according to the† National Association of Colleges and Employers,† in 2003, the top earned with a PhD, was 69,904, with the lowest earnings being 48,585 a year (Employment outlook, 2012). Smith said the start ing salary at his firm, with a BS in mechanical engineering is around 55k, a year. Mechanical Engineering offers a range of advantages, such as job security, excellent benefits, advancement opportunities, and salary, but with all the advantages there are some disadvantages to the career. Long working hours, meeting high expectations in the classroom, meeting job requirements, in a time where the economy is very competitive, undergoing long training hours for at least two years , and working on projects in a team setting, where they can be more time consuming(M. E. Disadvantages, 2012). There may be some travel involved for meetings, and conferences to stay current on new things ithin the field (Employment outlook, 2012). Smith said when he advanced in his job he took on more responsibilities, but he simply accepts that work is work and eventually he will get rewarded for it as long as he does a good job. I chose Mechanical Engineering, as my topic, because the discipline of mechanical engineering is all about pushing the boundaries of technology. Creating things, d evelop things, plan structures and look into detail the advantages and disadvantages of these tools in society. Mechanical engineering, as noted earlier, is an interdisciplinary program. A person will need to a have solid background on a variety of subjects and ideas so that they can have a holistic approach when taking on a project. Another reason I chose to do my paper on this career is the fact that my son is going into this professional, and I could have a better understanding of exactly what a Mechanical engineer is. With all the research I have done, I believe this career is a perfect fit for him. Reference Andrews,N. (N. D). Mechanical engineer disadvantages. Retrieved from http://www. ehow. com/info_10004398 Careers. (ND). Mechanical engineering careers, jobs, and employment career information.