Metallic Minerals free essay sample

MATALLIC MENIRALS ROLL NO: 07 Metallic Minerals On an auspicious day, sometime around a million years ago, a member of the Homo habilis species stood erect and walked steadily on his two feet and his two hands became totally free. A new species – Homo erectus—began its journey on a new evolutionary track. This great change took around four million years after his ancestors – the hominids — broke free from the lineage of  apes and chimpanzees. But , perhaps for the next seven to eight hundred thousand years, the descendants of that first Homo erectus kept wondering about what to do with the two free hands apart from holding bones and logs of wood. That was till someone picked up a stone and threw it to some animal – probably because he was scared and was trying to defend himself, or because he was hungry and wanted to get some flesh to eat. But unconsciously, he began the gainful use of a mineral, and unconsciously again, began the evolution of a new  species –Homo sapiens, the modern man. We will write a custom essay sample on Metallic Minerals or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page Evolving down the generations, man learnt to be choosy in picking up the stones; he realized that all stones are not good for his needs; he tried and erred, and through innumerable trials and errors spanning over tens and hundreds of thousands of  years, finally he zeroed in on a sharp-edged hard mineral that we have named flint. With the sharp edges of flint, he could tear animals for hide and flesh; and much later, he could make knives and axes and spear heads. Flint became the backbone of economy. He began digging the earth, taking out new treasures and burning them. Thus was produced, some 6000 years ago, a new mineral, and from that a new material to which, much later, we have given the name copper metal. And that day began the Copper Age. In fact, this was the beginning of both mining and metallurgy. Not satisfied with copper any longer than a few hundred years, he began experiments with other metallic ores like tin, zinc and lead, and with a stroke of metallurgical genius, produced bronze. In the next two thousand years, by now, he knew about gold and silver also — not so  much for industrial usage, but more for ornaments and amulets. Then came that wonder metal called iron. Man entered not only the Iron Age, but also what is known as the New World. Iron continues to be the backbone of economy even today, supported not just by copper, tin zinc, lead, gold and silver, but by a host of other metals. Although flint has survived the ages and still lives today — in name at least — in some cigarette lighters, we no longer use it for getting energy. Coal, petroleum, natural gas and uranium are the sources of energy now. But compared to the thousands of years of history of copper, lead, zinc tin, gold, silver and iron, the oldest amongst these energy minerals i. e. , coal, has come to our life in a big way, only within the past 400 years or so. And we must not forget that for mining and using these energy minerals — and, in fact, all the minerals that we use today – we need machines, we need metals, we need metallic minerals – in America, in Europe, in China, in India. Even if we do not mine the metals, they still enter from soil into plants and through plants into the cells, tissues and organs of human bodies, to help the humans live healthily. Such is the importance of  metals and metallic minerals in industry, in economy and in human life. From any mineral we do not get a metal. The minerals, from which we get metals, are called ores. Amongst the ores, there are many which are used only for extraction of metals, and there is no other use of them. There are also a few ores which have multiple uses. Of course the most important use is to extract their metal contents, but they can also be used straightaway for making industrial products. As a matter of convention, these are called metallic minerals in economic and statistical circles, to distinguish them from energy minerals and industrial minerals, which are not at all used for extraction of any metal. Examples of such metallic minerals are bauxite, hematite, chromite etc. The importance of these metallic minerals in Indian economy can be gauged from the fact that during the financial year ending March 2006, the total value of production of such minerals was 89. 3 billion rupees i. e. , about 12% of the total value of production of all minerals which was 751. 22 billion rupees and this despite the fact that the value of the metals has not been accounted for in these statistics. But again, the value of metals cannot just be  measured in terms of  rupees; we should also think what would have  happened without the metals. The re would not have been any industry, there would not have been any agriculture, and there would not have been any civilization. What are the uses of some Metallic Minerals? Metals such as nickel, copper and zinc are fundamentally important to modern society since they are used for an endless variety of purposes. A few examples are listed below: * Copper: Copper Pipe, Electrical Wires, Canadian Penny * Nickel: Stainless Steel, Cars And Trucks Frames, Batteries * Titanium: Artificial Joints And Surgical Instruments, Airplane Structures * Iron: Bridges, Car And Truck Frames, Axes, Tools, Steel Girders * Platinum: Petrochemical Industry To Make Gas And Purify Oil, Catalytic Converters On Cars And Trucks To Reduce Emissions * Zinc: Galvanized Nails And Cars Lead: Wet Cell Batteries * Gold: Jewellery, Electrical Wiring Why is a particular metal or a metallic mineral used to perform a particular function or to make a particular product? That is because every metal possesses a unique combination of physical and chemical properties, and in this respect no two metals or two minerals are exactly the same. So a particular use of a metal or a mineral can be best und erstood if the use is linked to the particular set of physical and chemical criteria. Now, gone are the days when all the rich near-surface deposits of metallic minerals were there asking to be dug out and processed for extraction of their metal contents. Those deposits are all finished during the last thousands of years. Today, we are left with only the poor grade minerals from deep-seated deposits for our needs of metals. Can we use any grade of a mineral for recovering its metal value? The answer is yes and no. The answer is yes, because firstly, man is not the producer of the mineral. The mineral was produced by nature hundreds of millions of years ago and stored in safe custody within rocks of  the earth; what man does is only draw some quantity from nature’s store house; and so, he has to accept whatever grade nature has created and whatever, out of the nature’s treasure house, his forefathers have left for him. Secondly, recovery of metals from its minerals depend not on the grades alone, but on an interplay of four factors namely grade of the mineral, grades of other input materials for its processing, technology and prices of the final products based on the metal. Out of  these, the price is determined by the market forces of demand-supply on which the producer has no control. But the other three factors are in the  domain of the producer; he may mine a high  grade mineral at a high cost, and use low grades of other input materials and employ low level technology to recover only a part of its rich metal value, or he may choose to mine an easily available low-grade mineral at low cost, and use high grades of other input materials and employ high level technology to recover almost the whole of whatever metal values are contained in the mineral. The answer is no, because at a given point of time there is a particular technology developed, and only one particular set of input materials with fixed qualities are available for processing a mineral. So, only one particular grade of the mineral can be processed with that technology and with those input materials, and only that particular grade has to be used at that point of time. The story does not, however, end with processing a mineral, recovering its metal values and using those metals for producing various consumer products. Nature has not given us minerals containing all metals, and nothing else. In exceptional cases, some pure gold nuggets were found, but they have all been taken away by our forefathers. As it stands today, though there are some metallic minerals like hematite with more than 65% of metal value, there are others that contain less than one percent. What happen to the huge quantities of material that are left out after the metal values are recovered? Such material may, in some cases, be even up to 99% or more of what is mined. Those are generally referred to as waste materials. Then there are wastages at the stage of manufacturing the consumer products out of the metals and the consumers themselves waste a lot of those products during and after their use. In fact, wastes generate at every stage of  economic activity, but it has been the experience that yesterday’s waste is today’s asset and today’s waste will be tomorrow’s asset. This happens because the developments in technology are not only about recovering the metals, they are also about utilization of the so called wastes. After all, technology is for minimizing the costs at every level starting from mining of the mineral down to the final consumption, so that at every stage the cost is less than the market price. There is another dimension of the usage of metals and minerals – substitution. Though there are some metals which are indispensable in certain uses, there are also some which can be replaced by some other material in a use. This happens if the cost advantages of using a metal vis-a-vis its performance are lost and a cheaper and/or better material becomes available. A metal can be substituted either by another metal (e. g. , copper by aluminium in electrical transmission wire) or by a non-metallic substance (e. g. , aluminium by plastics in construction material). Distribution of Metallic Minerals World Mineral Map (Metallic) Indian mineral map (metallic)

Concussions essays

Concussions essays A concussion is when someone receives a blow to head, face or jaw, or any quick movements that would injure the brain stem, or causing a bruise on the brain. Common symptoms of a concussion would be: headaches, disorientation, dizziness, vacant stares, lack of coordination, amnesia, nausea, double vision, and ringing of the ears. These symptoms have been known to last for weeks, but usually only last a few hours to a day. There are two common types of sports related concussion acceleration/deceleration and rotational1. Acceleration happens when you are standing still and an object that is moving hits your head. Deceleration is when the head moving and hits something that is not moving. Rotational injuries usually happens when something hits on the side of the head causing the brain to rotate on the spinal column, this is a more serious injury. Some on the field doctors use a three-point system to determine the seriousness of a concussion. The three-point system is divided into three grades, one being the least problematic, and three being the most. A grade one concussion has brief confusion and other common symptoms that clear up within fifteen minutes. A grade two has brief confusion and other common symptoms that last more than fifteen minutes. A grade three has loss of consciousness for any length of time. After a concussion happens you can have symptoms known as post concussion syndrome. Some symptoms of post concussion syndrome or behavioral mood swings, memory loss, and problems concentrating or thinking. An athlete who acquires a concussion is supposed to take time off according to how serious the injury is, if the athlete does not take the required time off they can acquire second impact syndrome. Post impact syndrome can be more dangerous than the original concussion, the effects can be permanent and even cause death. To treat someone with a concussion you sh...

Strain Gauge Lab Report Example | Topics and Well Written Essays - 1000 words

Strain Gauge - Lab Report Example Effect of Temperature Variations on the ResultsAn increase in temperature would cause the object to undergo thermal expansion hence increase in size. Resultantly, the change in size will be detected by the gauge as strain with its resistance and that of the connecting wires changing. However, the constantan alloys that make up the gauges are made in such a way that they counter resistance changes that are recorded due to thermal expansion. It is upon the person carrying out the experiment to select the best alloy for the object being experimented on because thermal expansion varies among various materials.ErrorsThe zero Offset – after connecting the strain gauge to the source of force, a zero offset would occur if the impedance of the four arms of the gauge are different. However, this can be rectified when one uses a resistor that is parallel to one of the arms. Temperature Coefficient of Gauge Factor is an error that occurs due to effects of temperature on the recorded strai n. As discussed earlier, changes in temperature would cause changes in the size of the object hence this change would in turn be recorded as strain. To correct this, a fixed resistance should be introduced at the input pole with voltage minimizing temperature sensitivity. Linearity error occurs when the sensitivity of the value of strain is affected by pressure in a function of thickness and quality of bonding. Overloading error may also occur if the strain gauge is loaded with weights it is not designated to accommodate.

Introduction to business Assignment Example | Topics and Well Written Essays - 500 words - 1

Introduction to business - Assignment Example As indicated above, the environment of a business is dynamic and most noticeably complex. Therefore, these environmental aspects are considered crucial to a business, because they have an impact on the growth of business and generally, its survival in a competitive market. These aspects are not only critical because of a business’ survival in the market, but also because they are a gauge against changes in the market. These are changes that may be technological or economical in nature such as recessions or bank interests. When an organization is able to detect these changes, it becomes easier to adapt or work on how to evade any undesirable results. Business adaptability is crucial in a competitive market, and businesses that are not able to adapt to change soon operate on losses. According to Goodman, Ladzani, Bates, Botha, and Vries a market is defined as a place where trade takes place and based on the participation of sellers and buyers. Sellers and buyers participate by trading in goods or information. In my opinion, this definition is simple and based on the physical location of a market. However, today’s markets are rather different and more virtual rather than physical. An excellent example of this is the internet, which is now a large market and one which is most liquid. In defining the market, it is crucial to also mention that the market is not only focused on products and services, but also satisfies the needs of customers (Goodman, Ladzani, Bates, Botha, and Vries 16). In my opinion, the most appropriate way of defining the market is to think about the needs of customers before making any other business related move. After this, the next best step to take is to identify the products which meet the customer needs. In the contemporary society, companies use marketing tools to convince the buyers to buy goods from the market. The nonprofit organizations use the marketing tools to encourage buyers in the market. Hence, in

First Nations and the Justice System Essay Example for Free

First Nations and the Justice System Essay First Nations are badly represented within our current justice system. They face a forced environment that does not represent their needs. Many of the problems that First Nations peoples face with respect to the justice system are influenced by their historical place in native and early in Canada. The first European settlers view of land ownership was a lot different from the Aboriginal theory that all things are related and development is viewed as circling the four parts of life: physical; mental; emotional; and spiritual. The Europeans didnt understand the Aboriginal spiritual attachment to their land. The concept of land ownership was foreign to Aboriginal culture and they could not understand the concept of owning lands, they believed that land was provided for the use and benefit of all living creatures. In Manitoba, Aboriginal people accounted for 71% of sentenced admissions in 2005/2006 (and make up 16% of the outside population) and aboriginals accused are more likely to be denied bail. Why are these percentages so high? Well many aboriginals still continue to fight for their rights to hunt and fish, even though they risk a higher chance of going to jail in doing so and most of the members in the jury of court are all non-aboriginals and will not side with them. Another factor that contributes to the high number of aboriginals in jail is the poverty in most of the reserves, the justice system has also contributed to the poverty by not allowing them to fight for their right. Social factors today that contribute to the poverty is, lack of education, there are not many Mikmaq schools that teach kids in the Mikmaq language. Some parents have been in residential schools, and most of those parents are alcoholics due to the way they were treated in the residential schools, being a alcoholic makes it difficult to provide for their family leading to the number of drop outs in schools because the kids feel like they need to take care of their parents. The number of Aboriginal students finishing high school is still lagging which is well behind the national average. In the 2001 census, 43 per cent of Aboriginal people between the ages of 20 and 24 have not graduated from high school, and not finishing high schools leads too having to find some way of making money, an easy way to make money without a education is selling drugs. For the Canadian population as a whole, the number of non-high school graduates in the same age range is 16 per cent so aboriginals contribute to most of that number. How could the government lower the high number of statistics for first nations people in jail? Well the government could provide a better educations for the mikmaq students, and put more money into reserves that are in poverty. The government could make more job opportunities for Mikmaq people. Maybe put more jobs in the reserves. Either way, the government doesnt do enough to change the statistics for the first nations people in jail.

Of Mice And Men: Four Major Themes :: essays research papers

Of Mice and Men: Four Major Themes "Of Mice and Men", by John Steinbeck, is composed of four major themes. These themes are the value of dreams and goals, moral responsibility, social injustice, and the bond of friendship and loyalty. The value of dreams and goals are that they provide hope and the desire to keep going in life, rather than laying down to die. When Lennie is feeling depressed in the woods he asks George to tell him about the "dream farm" again. This is the farm that Geore and Lennie hope to own someday. Even though this dream seems almost impossible at the time it still generates enough hope to keep Lennie and George going. When George starts talking bout it Lennie gets all excited and happy and so does George. Another example of the power of dreams is when Candy over hears George and Lennie's "dream farm" and becomes a part of the dream. Candy goes from a depressed sad additude to a cheerful excited one. He now has hope of doing something and it came from the "dream farm". A final example of the value of dreams and goals is when Crooks hears of the farm. Crooks is a lonely black man who has no future, but when he starts to think of how he can be a part of the dream he also gets happy and excited, until his dream is crushed. Many people of good character have to honor certin moral responibilites. George is bond by his own moral to take care care of Lennie. No one makes him do it, he just does it because it feel like the right thing to do. Candy felt like he neglected his moral responibility to shoot his own dog. Candy felt real bad inside because it was his job to shoot his dog but instead Carlson shot him. This shows that when a person goes against what is moraly right to them , they hate themselves for it. At the end of the story George is forced, out of moral, to shoot Lennie. It was the right thing to do, and even though it almost killed George inside to kill his best friend, he still did it. Social injustice is when a person or a goup of people feel they are better than people who are different by race, inteligence, age, sex, or other differences. Curley is rude and mean toward Lennie for the sole reason that Lennie is a big guy. Curely dosn't like big guys so he singles out Lennie and

Compare and contrast of the three women Essay

Virgin Mary Mary is an important figure in catholic faith, Mother of Jesus Christ in physical body, she is also the spiritual Mother of the Church, the Bishops of the Second Vatican Council gave this title to her. We know little biographical information about Mary, our greatest source would be the books of Matthew, Mark, John and Luke. From these spiritual accounts – and knowledge of the everyday circumstances she would have faced – comes a picture of the Mary the shepherds would have found in Bethlehem: a woman who was young, devout, offended by injustice, devoted to her child, and, many believe, sorrowful in the knowledge of what his fate would be. Mary was bethroed to Joseph when the angel Gabriel appears to her and says she is to bear the son of God, she asks, â€Å"How can this be, since I am a virgin?† She is told that nothing is impossible with God. Mary’s consent and willingness to endure social injustice for God is an holy act in itself, as women suspected of adultery were often stoned to death. Throughout her life she seen as very holy and is believed to be the Immaculate Conception i.e. born without any sin. Although Mary herself is holy as well as all her acts, the most courageous act she did was watching her son die on the cross. Mary endured the pain because she was a good piteous woman devoted to God, she knew Jesus’ death was inevitable. Florence Nightingale Florence Nightingale was born in May 12th 1820. She was an aristocrat born to wealthy British parents. At 16 Florence thought she heard the voice of God telling her that she had a special mission in life. Florence suspected it had something to do with nursing because as a young child she had always enjoyed caring for the sick. Traditionally she was meant to behave like a ‘upper class lady’, but Florence was reculant to do so, having found her passions elsewhere. She turned down suitors and social parties to instead take up studying health and medicine. As she was a woman of the upper class, this behaviour was not expected. A cultured lady of that day did not enter in hospital work and her family’s opposition finally prevented her from  working in a hospital. She overcame this obstacle by studying at a protestant school for nursing. Later she became the superintendent of a hospital in London. At the Crimean War, Florence was asked to take charge of nursing. There she revolutionized hospital care. She cleaned up the hospital, set schedules, ordered supplies, and once the hospital was running smoothly- taught the soldiers how to read and write. When she returned to England she fell sick from Posttraumatic Stress Disorder. Ministers, heads of government, authors, politicians and reformers came to her for her advice. She received many public honors and was the first woman to be awarded the British Order of Merit. Florence almost single-handedly invented modern nursing, as we know it today, and created a new image of female nurses as a professional class. Irena Sendler Irena Sendler was born in 1910 in Otwock, a town some 15 miles southeast of Warsaw. She was greatly influenced by her father who was one of the first Polish Socialists. During WW11 Irene defied the Nazi’s and in a show of remarkable bravery, rescued 2,500 Jewish children by smuggling them out of the Warsaw Ghetto. She was rescuing these children from most certain death, as very few came out of the Warsaw Ghetto alive. Irene worked in the Warsaw Social Welfare Department and as a result was able to go about freely without suspicion. When Irene saw the prejudice and terrible conditions that were being forced upon the Jews she was appalled and decided to join the Polish underground resistance movement Aid to the Jews. Irena Sendler accomplished her incredible deeds with the active assistance of the church. â€Å"I sent most of the children to religious establishments,† she recalled. â€Å"I knew I could count on the Sisters.† The children were given false identities and placed in homes, orphanages and convents. Irena Sendler carefully noted, in coded form, the children’s original names and their new identities. But the Nazis became aware of Irena’s activities, and on October 20, 1943 she was arrested, imprisoned and tortured by the Gestapo, who broke her feet and legs. Though she was the only one who knew the names and addresses of the families sheltering the  Jewish children, she withstood the torture, refusing to betray either her associates or any of the Jewish children in hiding. She escaped from prison but for the rest of the war the Gestapo pursued her. After the war she dug up the jars and used the notes to track down the 2,500 children she placed with adoptive families and to reunite them with relatives scattered across Europe. This lovely, courageous woman was one of the most dedicated and active workers in aiding Jews during the Nazi occupation of Poland. Her courage enabled not only the survival of 2,500 Jewish children but also of the generations of their descendants. Her courage, strength and the goodness of her spirit is honored forever by those lives she saved. Compare and Contrast Mary, Irena Sendler, and Florence Nightingale all have something in common. Each and every one overcame social injustice, discrimination and prejudice in the name of all things good. Virgin Mary knew she would be shunned, as her baby was conceived before marriage, back then adultery was punishable by stoning to death, yet she agreed to do god’s work out of love for the Lord. Irena Sendler risked her life for the 2,500 children she saved, her deeds could have gotten her killed yet her faith and morality was more important to her, and Florence Nightingale overcame the social ethics and restrictions of her time to do what she believed to be God’s work. Another similarity is the fact that all three women saved lives in their own respective way. Unlike Florence and Irena, Mary did her deeds indirectly and in a more spiritual sense, she gave birth to Jesus who is spiritually viewed as the savior of mankind, he gave people salvation, faith and hope. Also, today many people see Mary as a role model and through her seek inspiration that leads many people to give up sin and live a good and holy life. This contrasts to the work of Florence Nightingale and Irena Sendler, these two woman saved people in the physical sense, through knowledge, nursing, and trying to prevent genocide. These woman strike inspiration and strength in all that read their story. Though they come from different eras and have different life stories to tell, all three are fine examples of the strength, faith and capabilities of a woman. Bibliography Internet http://net2.netacc.net/~mafg/mary03.htm http://www.auschwitz.dk/Sendler.htm http://www.catholic.org/saints/saints/lucy.html http://www.catholic-forum.com/saints/stl01001.htm http://www.dnai.com/~borneo/nightingale/tl1.htm http://www.geocities.com/squillin_us/Mother%20Mary.htm http://www.holocaustforgotten.com/sendler.htm Books Book of Saints Mark Straton 1991 J.M Dent Pty. Dictionary of World Biography. Barry Jones 1998 The Age Encyclopedia of World Biography McGraw Hill 1973 McGraw Hill Inc. Florence Nightingale John Drasedon 1988 Wiley and Sons LTD Virgin Mary Linda McWell 1963 Curtin Pty.