Lab report Essay Example | Topics and Well Written Essays - 1000 words

Lab report - Essay Example The method of tensile testing is conducted by a ‘tensile testor’ in which the test specimen is clamped and loaded and subjected to a tensile force until the point of failure. ‘Stress-strain curves are an extremely important graphical measure of a material’s mechanical properties’ (Roylance, 2001). Stress is defined as the force of resistance offered against the deformation and Strain is defined as the ratio of the change in length to the original length of the member (Ramamrutham, 2003). The stress-strain curve for the specimen is an important method of characterizing the behavior of the material and adjudging its suitability as a material for any function. Almost all the materials, obey Hooke’s law in the early portion of the curve i.e. at low strain which states that stress is proportional to strain with the constant of proportionality being the Young’s modulus, E: Stress = Strain ? Young’s Modulus. As the strain increases, the linear proportionality comes to an end at a point termed as the proportional limit and marks the beginning of the plastic phase rearrangement of the specimen. Plasticity requires molecular mobility and materials lacking this mobility are usually brittle rather than ductile. â€Å"Polymeric materials behave both as viscous fluids as well as elastic solids. They are viscoelastic materials† (Koustos, 2002). The stress-strain curve of a polymer is different from those of other materials. The critical point in the stress-strain curve is the yield point beyond which the material enters the plastic deformation state. Experimentation The experiment was conducted to obtain the stress-strain curve of polymer samples and study their behavior under the application of tensile force. For this test, polymer samples were loaded and clamped in the tensile testing machine. The tensile testing machine that was used was Instron 1026. The tensile testing machine pulls the sample from both ends an d measures the force required to pull the specimen apart and how much the sample stretches before breaking. The testing was done on four different specimens: PE (polyethylene – from a shopping bag), PP (polypropylene – from plastic folder), Rubber (natural rubber – from a rubber band) and Acetate (cellulose acetate – from an overhead transparency). The specimens were obtained by cutting the polymer samples into appropriate lengths. The thickness and width of the samples were measured before stretching each one of them and putting them in the tensile tester. The dimensions of the specimens are taken with the aid of calipers for precision. Results and Discussion The stress-strain curves for the various test specimens are as follows: Figure 1: Stress-Strain Curve of Rubber (Poly-Isoprene) Figure 2: Stress-Strain Curve of Acetate (Cellulose Acetate) Figure 3: Stress-Strain Curve of PE (Polyethylene) Figure 4: Stress-Strain Curve of PP (Polypropylene) S. no. T est name Tensile Strength (MPa) Elongation at failure 1 PE 11.1 26% 2 PP 23.5 738% 3 Rubber 4.1 575% 4 Acetate 1 181.9 131% 5 Acetate 2 297.3 114% 6 Acetate 3 166.9 93% It can be observed from the graphs that the stress-strain curve of acetate was obtained thrice. The possible explanation for this can be that cellulose acetate exhibits different tensile strengths at different states – dry, wet & after being boiled (Stadlinger). The difference in

The French and Indian War Essay Example for Free

The French and Indian War Essay Prior to 1754 French Indian War, the 13 North American colonies that would eventually become the United States of America were at a rate of rapid increase. Colonial trade with England has increased by over 360%, all colonies were reproducing successfully, with a rate of natural increase of 3%, and the population doubling every 25 years, and on top of that, colonial power increased with the idea of Salutary Neglect, and colonial assemblies. The French Indian War had cause a multitude of changes and shifts in America, on political, economical, and ideological levels alike. For a start, the French and Indian War altered the political aspects of the 13 colonies. Prior to the French Indian War, due to the idea that it was beneficial or healthy for the 13 colonies if they had some sense of freedom, independence and self-governance, this was dubbed Salutary Neglect. The main form of political governance in the colonies was the colonial assemblies. These assemblies were responsible for governing their respective colonies through city courts. These courts would make decisions that pertained to each of the colonies, like appointing members to the unicameral and bicameral assemblies. Building on this knowledge, after the war ended in 1763, with the Treaty of Paris 1763, one of the main consequences was the end of Salutary Neglect. Most colonial assemblies were shut down as a result of this, giving the colonial Royal governors more power than they previously had. Another consequence of the Treaty of Paris 1763 was the French losing every last bit of their land in North America (Doc. A). The French originally fought in the French Indian War for control of the Ohio River Valley, which was an important area for trade and growth. Progressing away from the political aspects that were altered by the French Indian War, the economical aspects were also altered ultimately. Before the beginning of the French Indian War, Britain didn’t have any major taxes imposed onto the colonies. That was before the war. After the French Indian War was fought, and the Treaty of Paris 1763 signed, the Stamp Act was imposed in 1765 by George III to help pay for the deficit created by the French Indian War, as well as King George’s War (1739-1748). This act was passed as a result of Britain needing more revenue, as for the revenue coming from the colonies prior to this act was â€Å"not yet sufficient to defray a fourth part of the expense necessary for collecting it.†(Doc. F). The Stamp Act, mind you, wasn’t a tax on stamps, but rather a tax on printed documents, such as  newspapers, journals, deeds, letters, et cetera. The Stamp Act required all printed documents to be stamped with a special imprint, which certified the document. Failure to do so would most likely result in a fine, or confiscation of the merchandise, which is why it fac ed so much opposition from the colonists, even though it only affected a certain few. Benjamin Franklin wrote a letter, addressed to John Hughes in Pennsylvania, suggesting the repealing of the Stamp Act (Doc. G). If he refused to repeal the Stamp Act, Franklin warned him that it would make him very unpopular among the colonists, and refuted that he should try to reconcile the colonists after the war, instead of taxing them. Benjamin Franklin truly feared violent opposition to the Stamp Act. This eventually led to the Stamp Act crisis, which resulted in Liberty Trees being planted. At these liberty trees, officials sent to collect taxes in more severe cases were tarred and feathered as a form of public humiliation. The Virginia Resolves were also passed as a result of the Stamp Acts, which claimed it as unconstitutional, and they could not be taxed without representation in Parliament. This type of violent opposition led to the repealing of the Stamp Act in 1766, and the passing of the Declatory Act in 1766 which gave Britain the right to make laws for the colonies. This concept is called parliamentary sovereignty, and went against the right of consent of the governed, and the colonist’s natural rights of life, liberty, and property, or alternatively, the pursuit of happiness. The British also assumed the colonists Virtual Representation. This is the idea that the colonies were represented in Parliament indirectly. Also, before the French Indian War ended with the Treaty of Paris 1763, which resulted in the Proclamation Line of 1763, which ran from the West of the Appalachian Mountains to England, Native Americans were getting defensive about their land, and warned the colonists to remove themselves from their area, as for they had no right to settle (Doc. B). The Chief of the Iroquois Confederacy, Canassatego, told the representative bodies in Pennsylvania, Maryland, and Virginia that basically, their motives are transparent, and the Native Americans knew the value of their land and instructed the representatives to promptly remove thei r men from their land (even though it wasn’t rightfully theirs) because they had no right to settle, and they felt greatly disrespected. After the war ended with the Treaty of Paris of 1763, the Proclamation Line was drawn to prevent all  British colonists from settling West of the Appalachian Mountains to prevent all future tensions with the Native Americans, even though proceeding the war, a large deal of their land was already lost. The war ultimately created economic stress in the colonies, because it resulted in more taxes (Doc. F), and isolated trade with the Native Americans, as for we usually traded fur pelts with them. This also could’ve foreshadowed their refusal to join the colonists in an alliance during the Albany Plan of 1754, as well the problem of westward expansion with Chief Pontiac’s Rebellion in 1763, which resulted in the senseless murder of thousands of British colonists. Adding on to other economic problems created by the war, the mercantile policies of the Navigation Acts were beginning to become heavily enforced again. England buckled down on the colonies to raise revenue (Doc. F.). This put a major halt on smuggling of goods to the 13 colonies. With the passing of the Writs of Assistance, the quartering British soldiers had a right to enter a colonist’s home at anytime and confiscate anything they suspected of being smuggled. Smuggled good were rarely found, but it enraged the colonists that the British had a right to do this on their land. To initiate the final point, are the altered ideological aspects that were altered as a result of the French Indian War. Preceding the French and Indian War, some of the colonists were sycophant to Britain. During the war, in 1755, George Washington wrote a letter to Robert Orne, wishing to join the militia. He was eager to serve under General Braddock, who would soon bring on the humiliating defeat during the failed capture of Fort Duquesne (Doc. C). George Washington’s loyalty and respect for Britain would soon change, like many other colonists ideological values about their â€Å"mother country.† Sources like the Massachusetts soldier’s diary dated 1759 proved British to be neglectful of their soldiers. The people who were once eager to serve under Britain now wanted out. The British Parliament refused to supply proper winter clothes, and liquor. To him, this is being denied â€Å"Englishmen’s Liberty.† The soldiers were not allowed to leave, so they may as well have been slaves at that point. (Doc. D). That’s just one ideological value changed as a result of the French Indian War. As I said before, many colonists thought highly of Britain as a mother country, with over 60,000 loyalists living the colonies, until the French Indian War. Rev. Thomas Banard’s sermon in 1763 praised Britain in an usually optimistic  way. He assumed the end of the war meant the colonist’s could be free and happy. No animosity could be sensed towards Britain. (Doc. E.) That was until the British decided to tax the colonists to increase revenue. (Doc. F. ). That resulted in the Stamp Act, which as you know, was every controversial and lead to violent oppositions, riots, and acts like the Virginia Resolves. Benjamin Franklin warned Parliament to repeal the Stamp Act before any of this opposition took place (Doc. G). In October 1765, on a new paper masthead was a very iconic image. There was a skull and crossbones stating â€Å"The TIMES are Dreadful, Doleful, Dismal, Dolorous, and DOLLAR-LESS.† It also read â€Å"Adieu Adieu to LIBERTY† which can be translated to â€Å"Goodbye to Liberty.† (Doc. H). Mind you, these are the same colonies that kissed up to Britain before the war. Acts in the same nature of the Stamp Act faced opposition of this sort. This substantiates the evident shifting and altering of ideological values that resulted from the French Indian war. In final analysis of this essay, one may think that the French and Indian war heavily altered the relationship between Britain and the American colonies. They’re right. The French Indian changed the relationship on a economical, political, and an ideological basis. The politics were changed during the disbanding of the colonial assemblies, doing away with of Salutary Neglect and the French losing all their territory as a result of the Treaty of Paris 1763, the economical situation was pressed one, with the Navigation Acts now being heavily enforced, cutting down on smuggling, with the new taxes on top of that, and isolated trade with the Native Americans and Britain, and most definitely on an ideological level, seeing the major shift of emotion and feelings towards Britain after the war, from optimistic, loyal, and respectful, to slandering them in a hostile manner. The tensions created by this war, and the abandoning of the debt on the colonist’s foreshadowing the hea vy colonial resistance that was to come, that would blossom into the American Revolution.

Hitler and His Reich :: World War II History

Hitler and His Reich Feeling that all was lost,Hitler shot himself on April 30, 1945. By orders formally given by him before his death, SS officers immersed Hitler's body in gasoline and burned it in the garden of the Chancellery. Soon after the suicide of Hitler, the Germ On Easter Sunday April 20, 1889, at an inn called the Gasth of Zum Pommer, the wife of an Austrian Customs official gave birth to a son, Adolf Hitler. He was the fourth child to the parents of Alois and Klara Hitler of Austria. Hitler was a good student. One of the teachers in his high school classified young Hitler as "notorious, cantankerous, willful, arrogant, and irascible. He has an obvious difficulty in fitting in at school." He did well enough to get by in some of his courses but had no time, for Adolf saw no real reason to stay in high school. He left school at age sixteen without a leaving certificate. In September 1907, Hitler left home taking with him all the money left to him by his father, who had died a few years earlier. The money was used for preliminary examination, the applicant was asked to submit drawings. Biblical drawings were most preferred. Hitler's drawings were returned saying they were "too wooden and too lifeless." He was rejected. He tried three months later and did not get pa Hitler moved into an apartment with his friend in Vienna. He pretended to be a student living off his relatives money. He read many books and sat in on the Austrian government sessions . Hitler speaks of his life in Vienna as "five years in which I had In 1913, Hitler moved to Munich. Life was not much better there until the First World War started in 1914. While many people were frightened and sad at the thought of a world war, Hitler was delighted. He held the rank of corporal, and in forty-seven b On October 13th 1918, a month before Germany surrendered to the Allies, his good luck ran out. When Hitler and his fellow dispatch runners were waiting in line for their food rations, British troops began lobbing high explosive shells nearby. Hitler soon regained use of his eyes, but as he was about to rejoin his regiment, he got the terrible news of Germany's surrender. "Once again, everything went black before my eyes, and I tottered and groped my way back to the place where we slept and bu As part of Hitler's job, he investigated a party called "the German Workers' Party.

Califonia Consort: Piano Quintet Essay

The consert was my first time and delightful that I had a opportunity to listen to classical music through the first concert, two Piano Quintets performed by Karen Follingstad, Alyze Dreiling, Susan Ung, Lorie Kirkell, Bert Turetzky at the Incarnation Lutheran Church on February, 19, 2012. The performance consisted of two pieces and the first piece performed was Piano quintet, Op 87 written by J.N. Hummel in the end of classic era and the second piece was Piano Quintet, Op 114 written by F. Schubert, also as well known as â€Å"The Trout.† It was interesting that Hummel composed this quintet in 1802, almost 20 years before Schubert wrote the Trout in 1819 and their composition were widely played during their lifetime; in addition, the both of them have a common in that those two are famous Piano quintets. I thought that the melodies were quite and resounded magnificently in my mind. I could even subconsciously focus on the notes and release feelings of tension. First of all, the Quintet Op.87 is a masterpiece; the first movement (Allegro E Risoluto Assai) at once captives and impresses the hearer with its power and passion. After this follows the Menuetto Y Trio, Largo, Allegra Agitato, is full of light-hearted merriment and ends with a brilliant and effective close. While listening to it, the melody reminded me of Mozart’s pianistic style and The Trout, which would be performed just next to it and, actually, Hummel studied with Mozart. Especially, the first movement of Quintet, OP.87 sounded like tango to me and it started with the violin by Alyze Dreiling, then, the piano sounded to make harmony. I felt that the piano sound was extremely live and rhythmical, whereas, the others created nervous tension for making harmony with the piano. As I said above, everything including Violin, Viola, Cello and Contrabass seemed to be harmony with another, the sound reflected to be able to emphasize each instrument and piano quintet. The second movement, Menuetto Y Trio, Allegro con fuoco, started quietly but, soon, it made a highly elated atmosphere which I was going into and let myself to the flow of continuing intensive melody. On the other hand, it sounded for me to ease tension occasionally. At that time, I could even felt melancholy strain. It repeated to raise tensions constantly, which it was the first time that the melody made me high tension emotionally and I was  impressed by the harmony of the piano quintet because I had never been to any orchestra or concert. After that, the third chapter, Largo, started and then, the sound of piano a bit went up with its fast pace and increased tension more and more, which I felt like sadness and depressed emotion; however, I could retrieve my mental stability by focusing on listening to it. My sentiment was raising highly as it was flowing fast little by little and, finally, was connected to the Finale, Allegra Agitato, the last movement. In the last movement, it became mild, warm and brighter again as if the first movement, the violin and cello sound much attracted my attention because of the wonderful and lilting sound. In the end of the Finale, it went up with high pace again and presented the peculiar principal theme which was of a somewhat martial feature. It ended up with the climax, tension of harmony. I could understand little why it is particularly interesting in its scoring and receive hummel’s great dramatic works by listening to it. Secondly, after Piano quintet, Op 87 performed, they played Piano Quintet, Op 114, widely known as The Trout. It was not first time to hear it but was first time to see the performance at the concert. It consists of five parts and is also immensely popular and famous because it was made by F .Schubert. As the name is The Trout, I felt the piano sound was fresh and animated as if trout was swimming lively from the first movement. When hiking the mountain and seeing the water of a brook, we can feel being full of life, animation and restfulness. I felt just like when I see the water of a brook and could even imagine the figure of trout. In the first movement, Allegro Vivace, the four instruments made harmony slowly based on the piano sound and, especially, the violin and cello stood out clearly. The powerful sound of the cello by Lorie Kirkell was so great and played a role as bridge. I was impressed by a merit of cello sound again and again. The second movement, Andante, was so lyrical melody that I could feel stability and richness like I had lived in village and been satisfied with my life; in addition, The three of the violin, viola and cello melodies definitely showed to advantage. I personally would like to listen to the music with lyricism because it radiates feeling of relaxation. From this part, I started to think this tune was made for cello because the cello sounded  ever-greater part of this music. After the second chapter, the third movement, Scherzo, was as if the piano and others were talking to each other to make harmony. It was greatly cheerful that it made me pleasant and it went up with fast pace. The light each sounds added zest to the melody. The reason why I listen to it again and again is this part because its flow was interesting to me like trout was playing in the water. In the fourth movement, Andantino, I felt different sensation of lilting due to the many times of playing a variation and foun d the other liveliness by hearing this chapter. This part was why it was named The Trout because it impresses that trout settles down to active, indeed. I also could imagine that trout was going all over in the water and playing; moreover, I could know this part was made of cheerful feature entirely. The Finale, Allegro Giusto, also was brimful of vigor. The four string instrument played theme and the piano repeated it in high speed. This part also made an impression which was fulfilled of vitality to me. I would like the music going on continuously fresh tune of the four string instrument’s sound. Somehow it made me feel like Hungary wanderer too because of the delightful melody. This performance was fascinating enough to hold attention of audiences. I was captivated by the great wonderful sound. By listening to these two piano quintets, I took a new step on the classic music. I was unfamiliar with classic music but, now, since I attended this concert, I sometimes listen to classic music and relieve stress. Now I realized that classical music has its own distinct charm compared to new age and the impression from the melody could be amplified when I appreciated musical pieces on the spot. It was today when I sank into a deep emotion with classic music, precious harvest to attend the great concert and listen to classic music.

A Singer I Admire

As we grow older, we find someone to looks up to. Some of us admire celebrities, family, and friends. I admire Andy Lau. A star of over 100 films and one of Asia's most popular singers, Andy Lau was born on September 27, 1961 in Hong Kong. He grew up in a very poor area where there was not even running water. The young Andy had to make up to eight trips a day to collect water for his family. Despite financial problems, Andy's parents encouraged him to do well in school, and upon graduating, he entered the TVB academy, where he studied acting and martial arts. After appearing on television for a couple of years, Lau moved onto films with 1982's Boat People. As was the norm for many young stars at this time, there was an attempt to diversify Lau by having him record an album. While these types of albums usually provide some extra publicity and money for the actor, for Lau they became a second career. His first album I Only Know I Love You came out in 1985 to a minor buzz. It was not until 1990, when Lau had established himself as one of Hong Kong's top actors. Lau's musical career intertwined with his acting, as he began to record songs for the movies he appeared in. Despite his success, Lau's career almost suffered a fatal flaw early on when he refused to sign a contract with TVB. Lau was blacklisted from Hong Kong television, and it was only through the intervention of Chow Yun-Fat (who was a friend of the director of Boat People, Ann Hui) that Lau began to find more work in movies. Despite having a reputation of being hard to work with, Lau continues to be one of Hong Kong's most prolific and bankable actors. In fact, there were times when Lau was so popular that he was working on multiple films as well as recording songs all at once, sleeping in his car as time allowed. This dedication to work seems to have finally paid off in one respect; in 2000 Lau won the Hong Kong Film Award for his work in Running Out of Time. In 2004, he won the prestigious Golden Horse Award for his performance in Infernal Affairs III, the sequel to the popular Infernal Affairs. Western audiences may also be familiar with his performance in the House of Flying Daggers. His singing career reached stellar status in 1990 with the release of the album entitled Would It Be Possible, and his subsequent releases only solidified his status as a marketable singer. [5] For that song, he would win his first 1990 RTHK Top 10 Gold Songs Awards. He would then win at least one RTHK award category every year consecutively until the year 2007. From Jade Solid Gold Top 10 Awards, he has won the â€Å"Most Popular Hong Kong Male Artist† award 7 times and the â€Å"Asia Pacific Most Popular Hong Kong Male Artist† award 15 times. He also entered into Guinness World Records for â€Å"Most Awards Won By A Cantopop Male Artist†. By April 2000, he had already won a total unprecedented 292 awards. Andy's success did not come easily. He is known most by insiders for his hard work and drive. Catching some sleep in his car between the midst of recording an album and making a movie is not uncommon for the singer-actor. Yet, Andy managed to excel in both games. As an actor, Andy never settled for two-bit roles or stereotypical characters who only excelled in kung fu. As a singer, Andy never seemed to be satisfied with status quo. Through the two-plus decades that Andy gave to the entertainment world, he persevered, he advanced, and he conquered. In a race to be the best of everything, Andy is the only one crossing the finish line. Andy Lau is an exemplary person. He is multi-talented actor, comedian, and even singer who has come a long way. His past amazes me and his diligence touched me. In my mind, Andy Lau is the role model which is why I admire him.