Brass Alloys and Their Chemical Compositions

Brass Alloys and Their Chemical Compositions Brass is any alloy consisting primarily of copper, usually with zinc. In some cases, copper with tin is considered ​a type of brass, although this metal historically has been called bronze. This is a list of common brass alloys, their chemical compositions, and the uses of the different types of brass. Brass Alloys Alloy Composition and Use Admiralty brass 30% zinc and 1% tin, used to inhibit dezincification Aichs alloy 60.66% copper, 36.58% zinc, 1.02% tin, and 1.74% iron. Corrosion resistance, hardness, and toughness make it useful for marine applications. Alpha brass Less than 35% zinc, malleable, can be worked cold, used in pressing, forging, or similar applications. Alpha brasses have only one phase, with face-centered cubic crystal structure. Princes metal or Prince Ruperts metal Alpha brass containing 75% copper and 25% zinc. Its named for Prince Rupert of the Rhine and used to imitate gold. Alpha-beta brass, Muntz metal, or duplex brass 35-45% zinc, suited for hot working. It contains both and phase; the -phase is body-centered cubic and is harder and stronger than . Alpha-beta brasses are usually worked hot. Aluminum brass Contains aluminum, which improves its corrosion resistance. Its used for seawater service and in Euro coins (Nordic gold). Arsenical brass Contains arsenic and frequently aluminum and is used for boiler fireboxes Beta brass 45-50% zinc content. It can only be worked hot, produces a hard, strong metal that is suitable for casting. Cartridge brass 30% zinc brass with good cold-working properties; used for ammunition cases Common brass, or rivet brass 37% zinc brass, standard for cold working DZR brass dezincification resistant brass with a small percentage of arsenic Gilding metal 95% copper and 5% zinc, softest type of common brass, used for ammunition jackets High brass 65% copper and 35% zinc, has a high tensile strength and is used for springs, rivets, and screws Leaded brass Alpha-beta brass with an addition of lead, easily machined Lead-free brass As defined by California Assembly Bill AB 1953 contains not more than 0.25 percent lead content Low brass Copper-zinc alloy containing 20% zinc; ductile brass used for flexible metal hoses and bellows Manganese brass 70% copper, 29% zinc, and 1.3% manganese, used in making golden dollar coins in the United States Muntz metal 60% copper, 40% zinc, and a trace of iron, used as a lining on boats Naval brass 40% zinc and 1% tin, similar to admiralty brass Nickel brass 70% copper, 24.5% zinc, and 5.5% nickel used to make pound coins in the pound sterling currency Nordic gold 89% copper, 5% aluminium, 5% zinc, and 1% tin, used in 10, 20, and 50 cents in euro coins Red brass American term for the copper-zinc-tin alloy known as gunmetal considered both a brass and a bronze. Red brass usually contains 85% copper, 5% tin, 5% lead, and 5% zinc. Red brass may be copper alloy C23000, which is 14 to 16% zinc, 0.05% iron and lead, and the remainder copper. Red brass also may refer to ounce metal, another copper-zinc-tin alloy. Rich low brass (Tombac) 15% zinc, often used for jewelry Tonval brass (also called CW617N, CZ122, or OT58) copper-lead-zinc alloy White brass Brittle metal containing more than 50% zinc. White brass may also refer to certain nickel silver alloys as well as Cu-Zn-Sn alloys with high proportions (typically 40%+) of tin and/or zinc, as well as predominantly zinc casting alloys with a copper additive. Yellow brass American term for 33% zinc brass

Physical Education Thesis 10 Facts That Will Make the Research Hooking

Physical Education Thesis 10 Facts That Will Make the Research Hooking When students search for good physical education thesis topics, they face the problem of proper facts selection. They must be verified, and every sentence must be informative. Besides, a student must follow all recommendations. One of them is a good paper structure. A thesis structure should be the following: Title page Abstract Contents Chapters (background, literature review, methodology, data analysis, discussion) Bibliography Appendices One more important feature of a thesis paper is that it must be 100% plagiarism-free. It’s important to avoid using many citations. It’s necessary to analyze facts and reflect them in your paper. It’s also important to remember sources mentioning in the bibliography. 10 Physical Education Facts to Make the Research Hooking The thesis is an academic paper that requires not only proper knowledge of the subject. It also requires the ability to organize received facts according to the needed format style and, naturally, it must be logical. More than 35% of American children from two to nineteen suffer obesity. When such kids grow up, they become many chronic health complications which lead to a lethal end. In the United States, 75% of adults also have extra weight, 41% of which suffer obesity. Physical Activity Guidelines proves that children must have no less than one hour of physical activity daily. That’s why school program provides children with not less than 30-minutes activity. The curriculum follows the national recommendation that is 2 hours 30 minutes in elementary school weekly and 3 hours 45 minutes in middle and high schools. Proper physical activity can prevent many diseases including heart diseases, high blood pressure, metabolism disorders, osteoporosis, cancer, and even depression. Lack of exercising can provoke energy imbalance and weight gaining. The statistic shows that approximately 23% of adolescents and adults and 81% of teenagers and schoolchildren lead inactive or sedentary way of life. Adults spend their time working in offices, and children watch much TV or play computer/smartphone games. A great number of people confuse physical activity and sport. In fact, physical activity includes all movements produced by the human skeletal muscles including walking, gardening, cleaning, playing, etc. Sport is a professional or amateur performance like races, box, tennis, football, etc. A sports activity requires strict rules and physical activity doesn’t need them. People above 65 must be active and need to be active nearly 150 minutes per week. Those who can’t be active because of poor health condition must move as much as possible. If a person can’t run, he/she must, at least, walk and not spend much time lying or sitting. In case a person can’t walk, it’s necessary to find the activity that can fit the person. Individuals who move with the help of the invalid chair can do specific exercises to improve the functioning of the upper part of the body. The researchers have found out that only 21,6% of American teens aged six to nineteen lead active ways of life. It means that they spend more than 60 minutes on sport or vigorous physical activity. The statistic includes data based on children’s daily schedule on working days (Monday Friday) and doesn’t contain information about their weekends. Muscle strengthening exercises became very popular among high-school students in 2015. Nearly 54% of all adolescents went in for weightlifting, push-up, street workout, and other types of exercising three days a week. Experts suggest 30-minutes aerobic activity per day for expectant mothers and during lactation. Such physical activity helps control weight and isn’t risky. One more strong scientific evidence is that pregnant women can avoid various complications like high blood pressure (preeclampsia) and gestational ( inside the womb) diabetes. Physical activity doesn’t affect the amount of breast milk and its quality. People with physical disabilities should have 150 or 75 minutes of moderate-intensity activity every week. That’s 10-25 minutes of physical activity daily. Experts recommend going in for aerobics and muscle-strengthening activities. Those who cannot cope with such load should just avoid passive ways of living and engage in activity regarding their physical abilities. Experts differentiate between 4 types of physical activity: Passive or inactive; Low activity (less than required); Medium activity (more than required – up to 4,5 hours a week); High activity (more than 5 hours a week). Proper exercising reduces the risk of death at the age considered to be less than average one for a specific population group. The scientific researchers together with health providers proved that people who are active 560 minutes a week (7 hours) have 40% fewer cases of cardiovascular diseases and cancer than those who are active half an hour weekly. Be sure that you know all the requirements! In case you lack formatting knowledge, you’ll lose points, and even high-quality thesis data won’t save the situation. Moreover, when choosing the topics for college papers, make sure you are interested in them so you are to investigate the issue to the fullest. References: Butt J, Weinberg RS, Breckon JD, Claytor RP. Adolescent physical activity participation and motivational determinants across gender, age, and race.  Journal of Physical Activity and Health.  2011;8:1074–1083 https://www.ncbi.nlm.nih.gov/pubmed/22039125 Child and Adolescent Health Measurement Initiative.  The National Survey of Children’s Health.  2007  http://childhealthdata.org/learn/NSCH. 2008 Physical Activity Guidelines for Americans. https://health.gov/PAguidelines/pdf/paguide.pdf

The Drinking Age Essay Example | Topics and Well Written Essays - 500 words

The Drinking Age - Essay Example This phenomenon is known as â€Å"binging† when the young adults begin consuming above the average amount of alcohol a body should consume- often they do this action as a sign of rebellion against the institution and the authority. A study conducted by Indiana University showed that 32% of underage drinkers are heavy drinkers as compared to the 24% of legal aged drinkers (Engs). The most underage drinking is observed by college students who while trying to get initiated into fraternities try to impress their peers or simply just because they get the chance to experience drinking. Many of the problems affiliated by drinking such as getting low grades in class, skipping out classes due to overdrinking the previous night, and getting into fights due to drinking are observed to be higher among people falling below the age of 21. The incidents of such acts occurring over the legal age are relatively less. It is recommended that young adults should be given proper awareness of the effects of alcohol and they should be permitted to drink alcohol in a controlled environment where they can be observed and assisted if they face any complications. That may be a reason why more than 100 college presidents signed a petition to lower the drinking age (Roan). One of the arguments in support of the 21 age restriction is that there has been a noted decrease in the number of traffic accidents caused by young adults who were intoxicated. But the decrease could also be attributed to more awareness of the effects of drinking while driving, implementation of designated driver programs, lower speed limits and free taxi services from drinking establishments. So the argument placed that it is solely the implementation of a higher age limit which has reduced the number of car accidents is incorrect. The drinking age should be decreased to 18. If the young adults are considered to be

AC PROJECT Essay Example | Topics and Well Written Essays - 500 words

AC PROJECT - Essay Example We have set a budget of $ 132000 for software expenses. The cost includes an allowance that will cater for unexpected costs during writing of different software. Travel expenses will amount to $ 71500. This amount will meet the travel demands of our team as we seek to participate actively in the growth of this company. To cover all the depreciation costs, we will require $255,000. Due to the complexity of the tasks being performed by this department, various unplanned costs are bound to be incurred. To cater for such miscellaneous costs, the department will require $ 110000. We hope that our budget demands will be looked into so that we can have a successful business year this year. The figure below shows an outline of the proposed budget. Our company has been very successful in the recent years. The massive financial support to the sales department has been of great importance. This year, our budgetary expenses are bound to reduce by a small percentage. This is because most companies have already invested in communication software and hence there are few numbers of potential customers. We expect to maintain our past growth rate despite this challenge. To achieve this, we will lower our sales revenue expenses to $4, 500, 000. This amount will be sufficient to help us reach the available customers in the market. The salaries for our staff will amount to a total of 360000. This amount will help us maintain our competent employees and hire more qualified employees if need arises. The nature of our duties demands a lot of travelling. The travel expenses are estimated to amount to $210,500. Compared to the previous years, this amount has been lowered since the numbers of available customers has decreased. The total amount for the proposed budget is $507000. With this budget, we will be able to maintain our growth level and hence move the company to another level of success. The budget outline is presented below. Our division has enjoyed the continued

Book Report Assignment Example | Topics and Well Written Essays - 500 words - 2

Book Report - Assignment Example McCarthy observed how some of the state’s top and influential people and their children had shamelessly betrayed America. He contends how â€Å"young men who are born with silver spoons in their mouths are the ones who have been worst†¦.† Therefore, according to McCarthy, the state government â€Å"is thoroughly infested with communists† (238). This was like allowing the adversary to invade the state via â€Å"dealing with a far more sinister type of activity because it permitted the enemy to guide and shape our policy† (p. 238). This has led to inequality, especially among those participating in legal processes, which is evident in the McCarthy’s argument where initially he claims to have a list of 205 traitors in the government; during his speech, however, the number turns to be 57 people. Besides, power concentration has acted as a freedom barrier where few people, despite their sobriety, manipulate it, which limits the liberty of the population. For instance, this is evident in the President Kennedy’s statement: â€Å"ask not what the country can do for you – ask what you can do for your country† (256). This implies that â€Å"Neither half of the statement expresses a relation between the citizen and his government that is worthy of the ideals of the free men in a free society† (256). This affirms how the people are the state’s servants while the beneficiaries constitute few persons who are influential and capable of manipulating power to suit their interests. Free people normally utilize the government as a tool where individuals, despite their status, normally unite as compatriots for the benefit of all, which is safeguarding their freedom. Therefore, a free man usually inquires â€Å"what can I and my compatriots do through gov ernment to help us discharge our individual responsibilities, to achieve our several goals and purposes, and above all, to protect our freedom?†

The media coverage Essay Example for Free

The media coverage Essay Write a team report explaining the nature of the crisis or problem. Discuss the media coverage, cite how the crisis or problem was handled by the person on the organization staff and critique the way the situation was handled by the media and the organization. Segregation between different ethic groups is common around the world. The tendency of mixing around with ones own race, especially in ones private space, is observable not only in Singapore but also in many other countries. Here in this report, we will look into the issue of racial discrimination in Singapore. What causes the individuals here to feel alienated or under-represented? Is there any possibility of us rising above the differences and appreciate them for what they are? Will the differences become transparent? How the government ensures that the minorities here are given equality with the rest? How did the government handle such situations? Have the government put in enough effort to handle these racial tensions? Introduction: Singapore, a multi-ethnic and multi-cultural society where all individual are given free reign to practice the religion of their choice. Four major racial groups will be Chinese, Malays, Indians and Eurasians. Therefore, to prevent any racial discrimination between the four groups, the government has made conscious effort in ensuring that the different ethnic groups in Singapore are equally represented. One big hurdle will be to achieve racial harmony between ethnic groups, encourage individuals to foster respect, understanding and acceptance of cultures within ones society. Some minorities has raise the issue of feeling alienated by the society and that the government has not done enough to reduce such issue. Still, through the recent survey, the majority of Singaporeans think of themselves more as citizens of Singapore than the race they are. This applies equally to all the three larger racial groups: Chinese, Malays and Indians. The strong national identity has still remained important within us and majority support Singapore to have a multi-racial society which allows for ethnicity and representation of ethnic identity. Social Integration cannot be achieved by holding a campaign or relying on the government implementation. It has to come from individual effort. Even though that there is a slight issue within these ethnic groups, we are still united and strong and able to fight against any destruction to protect our own nation. The recent SARs crisis, Fabric of Nation and National Day has definitely showed the strong bond between these four ethnic groups.

The Detective Story Genre: Arthur Conan Doyles Sherlock Holmes Storie

The Detective Story Genre: Arthur Conan Doyle's Sherlock Holmes Stories One of the most popular literary forms is the detective genre. The most remarkable detective author of all time is the late nineteenth century writer Sir Arthur Conan Doyle. His most prominent works are the famous Sherlock Holmes stories. These novels and short stories set the standard for the genre. Arthur Conan Doyle's Sherlock Holmes stories can be considered a model for detective fiction because each is centered on a mystery, Sherlock is a brilliant detective, and clues are a prerequisite for success. The very essence of any detective story is the mystery. Unlike murder mysteries, which have a lot in common with detective stories, Holmes's problems are not invariably as severe as homicide. These mysteries are not usually insignificant though, and "Often they have to do with theft or murder" (Adventures). The first mystery may be an important and confusing conundrum, but there is often a more worthy case that presents itself after the first has commenced. This adds a level of intrigue to the tale because "The first story leads towards dissolution, the second towards restoring order" (Horsley). In each adventure, someone has been or is in danger of being wronged by another person, and comes to Sherlock for help. This creates "A clear and unambiguous triangle of characters - the investigator, the victim, and the transgressor" (Horsley). All of this is incorporated into the author's puzzle. Something important and immoral is done in every detective story. Whether the detective is clearing a client of blame or prosecuting someone, he is always on the right side, and working against the wrong. The detective may not always complete his j... ...1 Feb. 2003. http://web12.epnet.com/ Horsley, Lee "Sherlock Holmes - Modernist Thought, Modernist _____Cities, and the Solving Intellect." 31 Mar. 03 _____http://www.crimeculture.com/359/Holmes.htm "The Adventures of Sherlock Holmes." Magill on Literature. EBSCO _____Publishing. 21 Feb. 2003. http://web12.epnet.com/ "Arthur Conan Doyle." Magill on Literature. EBSCO Publishing. 21 _____Feb. 2003. http://web12.epnet.com/ Jenson, Jens Byskov "The Man Sherlock Holmes." 23 Feb. 2003. _____http://sherlock-holmes.hypermart.net/sherlock.html Leadbetter, Claire "Why Were Sherlock Holmes Stories So Popular?" 31 _____Mar. 03 _____http://www.geocities.com/athens/acropolis/8950/holmes/shpaper.htm "The Greek Interpreter." Magill on Literature. EBSCO Publishing. 21 _____Feb. 2003. http://web12.epnet.com/