Creg Seager Essay Example | Topics and Well Written Essays - 1500 words

Creg Seager - Essay Example As the discussion stresses  Creg Seager is brought about as a contemporary Christian as he has done great things with his skills as a nurse. He travels to different countries preaching the word to the needy and providing medical services. Creg Seager takes the responsibility of helping in bringing glory to God. It means that the Creg Seager takes the jurisdiction of conducting and giving instructions and acting as an example of the best ways of praising and worshipping God.This paper highlights that  Creg Seager demonstrates that time is important resource that cannot be reversed if put into bad use at any cost that makes it vital. In any organization time is the key factor determining what is to be done at what time and what achievements are to be in place before or after a specific time.   Time management helps achieve specific achievements within a given period. A manager should have good management skills to ensure that there is consistency within the organization. An effec t leader delegates staff into doing specific duties within a given time frame. It helps in identifying priorities, avoiding multitasking and reducing disruptions. To demonstrate this, when a leader has good time management skills, he/she can divide tasks among the employees, accomplish certain priorities first and gives ample time for every activity. Creg has proven to be an efficient time manager by performing different tasks at specific time. This is brought about by the location of adequate time to visits in different countries.

The Special Properties Of Concrete Construction Essay

The Special Properties Of Concrete Construction Essay Admixtures are used to give special properties to fresh or hardened concrete. Admixtures may enhance the durability, workability and characteristics of a given concrete mixture. Admixtures are used to overcome difficult construction situations, such as hot or cold weather placements, pumping requirements. The use of admixtures to increase the workability or to accelerate the hardening of the concrete will be permitted when approved by the Engineer. Admixture dosages shall result in the mixture meeting the specified plastic and hardened properties. The major reasons for using admixtures are 1. To reduce the cost of concrete construction. 2. To achieve certain properties in concrete more effectively than by other means. 3. To maintain the quality of concrete during the stages of mixing, transporting, placing, and curing in adverse weather conditions. 4. To overcome certain emergencies during concreting operations. CHAPTER 2 Set Retarding Admixtures Set retarding admixtures are water soluble chemicals that have little or no other effect than to delay the setting of the cement. They do not plasticize significantly and have little or no effect on the water demand or other properties of the concrete. Set retarding water-reducing admixtures not only delay the setting of the cement but are also efficient in plasticizing concrete or reducing its water demand. Most commercially available retarders are of this type. Retarding water-reducers and retarding high range water reducers are used to: Give workability retention to the concrete Delay the setting time of concrete Prevent the formation of cold joints Increase initial workability Increase ultimate strength Produce economies in mix designs Materials Used The main types of chemical used for retarding admixtures are: Sucrose and other polysaccharides Citric acid Tartaric acid Salts of boric acid Salts of phosphoric, poly-phosphoric and phosphonic acids. The main types of chemical used for retarding water reducing admixtures are: Hydroxy carboxylic acid salts Hydroxylated polymers Lignosulphonic acid salts These may be also be used in conjunction with sulphonated naphthalene/melamine-formaldehyde condensates or polycarboxylates to produce retarding high range water reducing admixtures. The retarder molecule chemically adsorbs onto the cement particle in a mechanism similar to that described for water reducers. The main difference is the strength of the chemical bond that is formed. This strongly links the retarder molecule onto the cement surface, blocking and slowing down the rate of initial water penetration into the cement. Retarder molecules also chelate calcium ions in solution, slowing the crystallization of portlandite. These two mechanisms slow the growth of hydration products, delaying the stiffening and setting of the cement but once initial hydration starts, the retarder molecules are swamped and normal hydration proceeds. Uses 5.1 Admixture Selection Where predictable set retardation is required, a retarding admixture is the best choice. Where set needs to be continually amended, a graph of dosage rate versus setting time can be determined for a given mix, at a given temperature. For phosphate based products, the retardation time graph may often be linear, and this is a major advantage for this type of retarder. Sucrose and other polysaccharides are more efficient, but a dosage versus setting time graph may often be exponential, making accurate prediction more difficult. These types are often blended with lignosulphonate to produce cost effective, retarding/water reducing admixtures. Hydroxy carboxylic acid salts will often reduce cohesion in the mix potentially enhancing bleed and segregation. Polysaccharides, especially if blended with a lignosulphonate, tend to stabilise some air and may enhance cohesion.The choice between the different types of retarding water reducing admixtures is often determined by other properties such as mix cohesion. Selection may therefore be based on the particular mix characteristics of the concrete. 5.2 Dosage Retarding admixtures based on phosphates and phosphonates are designed to have a linear effect of dosage upon setting time. The dosage rate used may be quite high, as they do not have any effect other than retardation. Depending on the molecule chosen, typical dosages are 0.1% to 3.0% by weight of cement to yield a delay of set of 1 hour to 35 hours. Retarding admixtures based on sucrose and other similar polysaccharides are very powerful, and their retarding effects are rarely linear so that small increases on the intended dosage can lead to large increases in retardation. They are very cost effective, but are more difficult to control than the higher dosage phosphate based types. Typical dosages are 0.1% to 1.5% by weight of cement to yield a delay of set of 3 hours to 50 hours. Retarding water reducing admixtures are very commonly used at a low dose, typically 0.2% by weight of cement, to reduce the water content of the concrete by 7 to 10% with only a small delay in setting. They can be used at higher dosages; typically 0.3 to 0.6% to reduce water content, but simultaneously to delay the setting time. Greater water reductions may be achieved by using retarding high range water reducers, generally at 0.5 to 1.5% dose, depending on the type. Retarders are quite sensitive to temperature. At low temperatures retardation will be further extended. At very high temperatures, the converse is true and it may be difficult to achieve the required workability retention and extension of stiffening time. 5.3 Cement type Retarding admixtures and water reducing retarding admixtures can be used with all types of Portland cement, including all those covered by EN197-1. However, it is very important to note that their effectiveness in terms of retardation of set is very dependent upon the type of cement. Cements such as CEM1 require the highest level of retarder to achieve a given level of retardation. However, as the proportion of slag or pulverised fuel ash, as used in CEM 2 and CEM3 types increases, then the level of retarder will decrease in order to achieve a given level of retardation. The chemistry of the cement is also important in determining the effect of retarders. Cements low in tricalcium aluminate (C3A) require significantly less retarder for a given degree of retardation than normal cements. 5.4 Yield Retarding admixtures do not have any significant effect upon the yield of concrete. Retarding water reducing admixtures, when used to reduce the water content of concrete, will reduce the yield in direct proportion to the water reduction made. This needs to be taken into account when modifying the mix design. 5.5 Overdosing The level of retardation achieved is related to the dosage used. Any overdose will result in an increase in setting time. Large overdoses of retarders can produce very long setting times and even small overdoses can have this effect if the initial dose is high. Provided the overdose is no more than double that which was intended, and the concrete is well cured to prevent it from desiccation, accidentally retarded concrete will normally set and recover strength within two to three days. Where a dosage range is given, the normal dose should be taken as the bottom of the range. Where very large, accidental overdoses occur or where large overdoses of a water reducing retarders have been used without a correspondingly large water reduction, the concrete may not recover its strength in a reasonable time. As a general rule, if concrete contains an overdose of a retarding admixture and has not set hard in 5 days, then it may not gain useful mechanical strength within a reasonable time. Effects upon properties of concrete 6.1 Strength As with water reducing admixtures, ultimate strength gain is increased with increasing water reduction Retardation of set allows the slower formation of a more ordered, smaller, denser cementitous matrix. This has the effect of increasing ultimate strength relative to an unretarded mix with the same water cement ratio. Acceleration of strength by heat produces the opposite effect, with the rapid formation of a coarse matrix. This explains why steam cured precast concrete rarely produces the same ultimate strength as concrete cured at normal temperatures and produced from the same concrete. 6.2 Workability Retarding admixtures do not have a significant effect upon initial workability. However, they generally have a beneficial effect upon workability retention, particularly at elevated temperature. Retarding water reducing admixtures, have a pronounced effect upon workability. Typically, an increase in slump of 60-100mm results from the addition of a dosage of 0.25% by weight cement. Set retarding high range water reducing/plasticizing admixtures may be used to enable workability to be increased to a greater extent, at a typical dosage level of 0.3 to 1.0%. 6.3 Slump loss Retarding admixtures are useful for helping to reduce slump loss, particularly at elevated temperature but it is still important to have a high initial workability. Retarding water reducing admixtures are very effective at reducing slump loss when used to increase the initial workability of the mix, but less so when used as a water reducer. Indeed, if water reduction is taken at the expense of high initial workability, initial slump loss may be slightly faster and will slow when about half the initial slump is reached. 6.4 Setting time The prime function of a retarder is to extend the setting (stiffening) time of concrete, usually in order to prevent the formation of cold joints between deliveries of concrete. Even if workability has fallen to almost zero slump, fresh concrete can be vibrated into, and will bond with, a preceding, older pour. In hot weather, even a small delay in deliveries or a short breakdown of the pump can result in the first concrete pours setting before subsequent pours can be placed and vibrated to form a monolithic joint. In deep pours, if concrete placed early starts to set, the heat generated can cause faster setting of concrete above it and again lead to cold joints. In this situation, retarder dosage can be progressively reduced as the pour proceeds. 6.5 Air entrainment Retarding admixtures do not normally entrain air, and some types, especially those based on hydroxycarboxylic acid, may actually reduce air content. This may cause these retarded mixes to feel harsher and have more tendency to bleed. Most types of retarder can be used effectively in combination with an air entraining agent. 6.6 Bleeding The total volume of bleed water arising from concrete is often related to its setting time because once setting starts, bleeding stops. Thus retarded concretes are always more prone to bleed. Any reduction in air tends to aggravate this potential problem. The plasticising component of a retarding water reducing admixture may help to offset this effect and some types are formulated to slightly air entrain in order to reduce bleed. 6.7 Heat of hydration Retarding admixtures do not reduce the heat output of concrete but do serve to delay the time of peak temperature rise by exactly the same time interval by which it was retarded. In small sections this may allow slightly more heat dissipation and so peak temperature may be a little lower. In thick sections there will be no reduction in peak temperature and there is evidence that the peak temperature may even be increased slightly. 6.8 Volume deformation Creep and drying shrinkage are not significantly affected by the inclusion of retarding admixtures. If the concrete is water reduced by the use of a retarding water reducing admixture, then drying shrinkage will be reduced. 6.9 Durability Provided that the concrete is correctly cured, then retarded concrete should be stronger and just as durable as equivalent plain concrete. However, because of the extended plastic stage, more attention needs to be paid to protecting the concrete before it sets. Retarded water reduced concrete will have a lower water content than the equivalent plain concrete, and will be correspondingly more durable. MECHENISM OF RETARDING ADMIXTURES Retarding admixture is an admixture that retards the setting of concrete. A retarding admixture causes cement set retardation by one or more offollowing mechanisms: (1) Adsorption of the retarding compound on the surface of cement particles, forming a protective skin which slows down hydration; (2) Adsorption of the retarding compound on to nuclei of calcium hydroxide, poisoning their growth, which is essential for continued hydration of cement after the end of induction period; (3) Formation of complexes with calcium ions in solution, increasing their solubility and discouraging the formation of the nuclei of calciumhydroxide . (4) Precipitation around cement particles of insoluble derivatives of the retarding compounds formed by reaction with the highly alkaline aqueous solution, forming a protective skin . Detailed Explanation According to the first mechanism, a retarding admixture is adsorbed on the surface of cement particles. This layer of retarding admixture around the cement particles acts as a diffusion barrier. Due to this diffusion barrier, it becomes difficult for the water molecules to reach the surface of the unhydrated cement grains and hence the hydration slows down, and the dormant period (period of relatively inactivity) is lengthened. Due to the slow hydration, no considerable amount of the hydration products giving rigidity to the cement paste will be formed and thus the paste remains plastic for a longer time. Later, when the admixture is removed from solution by reaction with C3A from cement or by some other way it is removed and incorporated into the hydrated material, further hydration is eliminated. On first contact of water with cement grains (C3S and C2S) calcium ions and hydroxyl ions are rapidly released from the surface of the cement grains. When concentration of these ions reach es a critical value (at which the solution becomes saturated), the hydration products calcium hydroxide and calcium silicate hydrate start to crystallize from the solution and then hydration proceeds rapidly. According to the second mechanism, a retarding admixture incorporated into cement paste is adsorbed on the calcium hydroxide nuclei and prevents its growth until some level of super saturation is reached during the induction period of hydration. Thus, retarder lengthens the induction period by causing an increase in the level of calcium hydroxide super saturation before crystallization begins. This is analogous to the poisoning of crystal growth of calcium hydroxide by the retarding admixture as both calcium and hydroxyl ions are present in the solution but unable to precipitate as a result of poisoning of the calcium hydroxide nuclei. According to the third mechanism, a retarding admixture incorporated into cement paste forms some kind of complexes with calcium ions released by the cement grains during the first few minutes. Formation of the complexes increase the solubility of cement, i.e., increased concentration of Ca2+, OH, Si, Al and Fe in the aqueous phase of the cement pastes will occur when hydrated in the presence of the retarding admixture. Thus the calcium ions and hydroxyl ions will accumulate in solution and will be unable to precipitate to form calcium hydroxide. For example, when ordinary Portland cement is hydrated in sucrose solution, lime is solubilised and a sucrose calcium complex (R -O à ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬Ca+ -OH) is formed in which Ca+ -OH group is attached to the five membered ring (R) of the sucrose molecule. Such sucroseà ¢Ãƒ ¢Ã¢â‚¬Å¡Ã‚ ¬calcium complex will be able to become absorbed on the growing calcium hydroxide nucleus. The adsorption of the complex on the calcium hydroxide nucleu s will inhibit its growth as the calcium and hydroxyl ions will not be able to precipitate. In this way, hydration is retarded. The fourth mechanism is similar to the first but here some kind of insoluble derivatives of retarder are formed by reaction with the highly alkaline solution as pH of the solution rises to over 12 within few minutes after first contact of water with cement. For example, inorganic salt admixtures (borates, phosphates, zinc and lead salts etc.) give insoluble hydroxides in alkaline solution. The cement hydration is suppressed through the precipitation of protective coatings of these insoluble derivatives around the cement grains.

The War on Drugs Essay -- Essays Papers

The War on Drugs To fully understand the significance and the seriousness of a War one must first fully understand the reasons that caused it in the first place. In this specific case the solution begins with several important yet seemingly simple questions†¦What is marijuana? How is it used? And why is it so coveted and widely distributed in Jamaica as well as the rest of the world?†¦ All these questions help clarify the reasoning behind the war on drugs and further investigation shows how Jamaica ends up being an important country in this puzzle as well. Lets begin with the first question, (What is marijuana), of course the dictionary definition is simply put,-a preparation of the hemp plant, Cannabis sativa, for use as an intoxicating hallucinogenic drug; applied to a crude preparation of the dried leaves, flowering tops, and stem of the plant that is generally smoked. However, beyond this explanation is what is commonly known as weed, which is simply an alternative to tobacco that results in sensational relaxed feeling that is described as high. This drugs origin can be traced back to ancient days when it was used as a healing supplement to cure several different medical conditions; its been used as a drink as well as an eliminator of menstrual pain and even more ironic marijuana has served as a religious connotation as well. However, the most commonly known usage of marijuana (after its being outlawed in the 1930’s) is as a drug and smoked or consumed by other means. Now that an understanding of the drug has been clarified one must look at the next important question, (Why is marijuana so coveted and distributed in Jamaica as well as the rest of the world?) Although marijuana usage and distribution is illegal ar... ...oes not effect the economy in a harmful way unless it is rendered illegal. This drug problem is much larger than Jamaica and should be handled as such. Work Cited/ Bibliography 1. â€Å"The Ganja Culture.† Jamaica Gleaner 27 Jul. 2001 http://www.jamaica- gleaner.com/ 2. â€Å"Jamaica Mulls Legalizing Marijuana.† Las Vegas Sun 25 Aug. 1999 http://www.cannabisnews.com/ 3. Morrison, Tony. â€Å"Holy Smoke! Legalize the weed, say church officials† 6 Jul. 2000. http://www.jamaica-gleaner.com/ 4. Kovach, Hill and Tom Rosenstiel. The Elements of Journalism. New York: Three Rivers Press, 2001. 5. Williams, Lloyd. â€Å"US$ ganja cut—back.† 13 Mar. 2000. http://www.jamaica- gleaner.com/ 6. Ritch, Dawn. â€Å"Marijuana bringing a new dawn.† 5 Aug. 2001. http://www.jamaica-gleaner.com/

A radical democrat: King’s Last Campaign

The task of this paper is two-fold; first, this paper will trace and explain the evolution of Martin Luther King, Jr.’s belief that war, racism and economic injustice are all intertwined and can be dealt with the restructuring of society’s priorities and addressed the necessity of a revolution of values; second, this paper will also explain how he carried out his beliefs in the Memphis Strike and the Poor People’s Campaign in 1968 [what the author and University of Washington professor, Michael K. Honey called â€Å"Martin Luther King’s Last Campaign†]. At the onset of this paper, it is important to note that King’s ‘background’ [which includes his race, habituation, education and religion among many others] is crucial in his struggle against racial discrimination, violence and economic injustice as experienced by blacks in the United States of America. The son of a minister, he was habituated in the teachings of Christianity and was able to attend and complete his formal education with degrees in sociology, theology and divinity. King was a pastor himself at Dexter Avenue Baptist Church in Montgomery, Alabama in the year 1953 prior to finishing his doctoral degree in systematic theology from Boston University on 1955. What prompted the Memphis Strike? Memphis in 1968 was ruled by a paternalistic â€Å"plantation mentality† embodied in its good-old-boy mayor, Henry Loeb. Wretched conditions, abusive white supervisors, poor education, and low wages locked most black workers into poverty (Honey, 2007). This characterization of the political, economic and social conditions of the blacks in Memphis in 1968 by Honey may be cited as cases of â€Å"manufactured and institutionalized oppression†. By manufactured and institutionalized oppression, I mean oppression which involves the mechanisms of law and power relations the basis of which is against the ‘natural law’. Natural law theorists, following the thoughts of St. Augustine that â€Å"an unjust law is not a law at all† and Aquinas’ notion of â€Å"law as an ordinance of reason†, view morality as essentially tied up with the very essence of law. How does King figure in all of this? How can we explain the evolution of King’s ideological perspective? The point is clear: Oppression and unfair treatment of individuals is not morally valid nor is it morally permissible most especially if the basis of such is the individual’s ethnicity or race. As the Kantians believed, each person has a capacity for rational deliberation and choice and as such, an autonomous being with dignity and therefore, ought to be respected by virtue of being human persons. The evolution of King’s ideological perspective may therefore be construed in such way that it is a product, both of his experiences as a black living in a white-dominated society and his philosophical and political development and this may be inferred from Fairclough’s book, â€Å"Martin Luther King, Jr.†, 1995. King’s speeches very clearly communicate his views: â€Å"I believe that unarmed truth and unconditional love will have the final word in reality†¦.I have the audacity to believe that peoples everywhere can have three meals a day for their bodies, education and culture for their minds, and dignity, equality, and freedom for their spirits[†¦] (as cited by Carson, 1998). Three important points about King and his political thrusts, philosophical orientation and as to why he may be called a â€Å"radical democrat† may be inferred from the aforementioned quotation. First, as a leading figure in â€Å"civil rights movement† King believed in the tenets of democracy and liberalism in the sense that he believed that both white and black Americans must have fair treatment in the realm of the law, for the purpose of law itself is the administration of social justice. Second, he believed in the â€Å"non-necessity of violence†. Influenced by Mahatma Gandhi’s â€Å"civil disobedience†, he believed that there are peaceful ways in and through which the problem of political and economic injustice may be resolved. It may further be inferred that for him, political, economic and social change can best be achieved not through violence [and that the government should not keep itself busy from going to war, as in the case of the Vietnam War] nor by transforming a portion or a sector of society but what is needed is a restructuring of the society as a whole. King believed that a â€Å"revolution of values† is a matter of strict necessity. King’s views may be identified as â€Å"radical† in this sense. He emphasized the need to restructure even how we think about black Americans or African Americans. It may be inferred that racism, the feeling of being superior over another race or ethnic group or nationality is grounded on the wrong premises; wrong modes of thinking and reasoning. It is by transforming our psyche and by appealing through reason and conscience that society as a whole may chart its rightful path towards genuine social change. Third, he believed and fought not only for civil rights but also for economic changes especially labor rights and lobbied for law reforms to be enacted to protect Negroes from exploitation and oppressive schemes adopted by employers. These include fair treatment and equal work opportunity, just compensation, etc. This is how he carried out his beliefs in the Memphis Strike and the Poor People’s Campaign. King served as a voice crying for the emancipation not only of black Americans but also of other human beings from the chains of oppression. Based on the above discussion, we can see why King believed that the problems and conflicts brought about by war, racism and economic injustice are all intertwined. What we can infer from his views is the interweaving and interconnecting patterns brought about by racism itself. But racism is not in itself the root of the problem; it is merely an effect of a traceable cause. This cause, this root of racism, is none other than a distorted value system, a wrong frame of mind resulting to feelings of superiority and even contempt and hate which further results to taking an unfair advantage of other human beings, plus a very materialistic market essentially driven by capital. The fault is, at bottom, deeply embedded with the minds of persons and a wrong value system, a wrong sense of pride and nationality, for it fails, in the Kantian sense, to respect persons for the sake of being human persons, not as mere means and tools that another person or race may use but as ends-in-themselves, possessing the capacity for rational thought, capable of making rational choices and thereby, beings that are autonomous and dignified and for the aforementioned reasons, deserve to be respected. References: Carson, C. A Call to Conscience: The Landmark Speeches of Dr. Martin Luther King, Jr.: Warner Books; Reprint edition (January 1, 2002). Fairclough, A. Martin Luther King, Jr.: University of Georgia Press, c. 1995. Honey, M. Going Down Jericho Road: The Memphis Strike, Martin Luther King's Last Campaign: W. W. Norton (January 15, 2007).   

Chemistry Assignment Essay

Metals are mined from ores, considering yield to see if it is economically viable for a business to mine at a particular site. However, due to environmental damage and global warming, recycling has increased globally to create a sustainable future. By examining the cost and energy expenditure of recycling and extracting aluminium we can understand why recycling is a better choice than extracting metal from its ore. Discuss the importance of predicting yield in the identification, mining and extraction of commercial ore deposits Yield is the amount of product obtained or in mining terms how much (amount) a particular metal can be extracted from an ore (a deposit of minerals in which a commercial metal can be extracted from). Predicting yield in the processes of identification, mining and extraction is vital to the success of a business. For a business to compete with the global markets, the investment must be profitable and in some cases sustainable to last year’s into the future. Percentage composition is used widely in the mining industries to calculate and measure the yield of particular metal from an ore. For example, haematite (Fe2O3), a compound consisting only of iron and oxygen, can theoretically produce around 70% iron while chalcopyrite (CuFeS2), consisting only of copper, iron and sulphur can produce theoretically 35% copper. However if we express yield as a percentage of the ore dug out, an iron ore would only contain about 16% iron and for a copper ore only contain 1-5% copper. This is because an ore dug out of the ground contains unwanted minerals like dirt, rocks and other waste products which add to the mass of the required mineral ;giving a low yield percentage. Since compounds like chalcopyrite and haematite have uniform composition, ores are mixtures of useful minerals and other waste products which have variable composition (different location will yield different amounts of metals). This will affect if it is economical to mine the ore at a particular location and hence demonstrate that predicting yield is important. Predicting yield in the process of mining and extraction is important, whether extracting the metal from the ore or actually mining it, because it can determine if it is profitable or not. Extraction techniques must be efficient and sustainable. Copper is extracted through roasting it with oxygen before smelting it to form liquid copper. It is then reduced by bubbling air into the liquid copper to reduce copper sulphide to copper metal. Since this sulphur dioxide doesn’t escape fast enough, it forms blister copper with is 98% copper. Electrolysis is used to refine it. Due the significant amount of energy required and the cost involved it may seem copper is unprofitable. Yet if the copper price is high, the consumption is high, location is not far from refinery plants and factories that use copper, if there is a steady sustainable source(abundance) of copper ore and the extraction technique is efficient plus cost effective then a profit can be gained from the high cost of extraction, transport and the money needed to pay for the energy consumption. For a copper ore site to be economical it must contain at least 5% of copper or more. Haematite is extracted through reducing it with carbon monoxide to form iron (metal) which falls to the bottom of the blast furnace. Limestone is also heated in the blast furnace which decomposes and reacts with silica to form a slag that floats on the liquid iron, hence stopping iron from reacting with oxygen. High heat is needed to separate iron from oxygen since iron is reactive to oxygen and sand and limestone is needed to prevent the union of these two elements. Hence for haematite to be economically viable an ore must contain at least 20% iron as the energy needed to extract the metal is large and the world’s demand for iron is great. Since iron ore price is relatively high, a profit can be obtained from deposits of iron ore that contain more than 20% of iron. Hence predicting the yield of ore deposits is important to determine if it is profitable to mine. Justify the increased recycling of metals in our society and across the World Recycling is a process that changes waste materials into new products. In recent years, recycling of metals has increased dramatically in Australia and across the world. This is because we are more aware that recycling metals saves money, energy and causes far less pollution compared to extracting metals from ores. This is also spurred on by the fact that our metal ore deposits are depleting (going to run out) if we mine and extract metals at this rate. Hence recycling has been encouraged by organisation like Planet Ark and this has helped spread the message of the benefits of recycling instead of putting money into extracting and mining ores. ‘Reusing and recycling’ metals allow us to conserve these precious commodities so it would be available for the future generation. Demand for metals will increase as new technology will be discovered. Hence recycling is needed to return back old and useless appliance so it can be made it new useful products. Figure 1: It shows froth floatation Note: The vast amount of water used during the process Generally recycling metals use less energy (melting material requires the breaking of weak intermolecular bonds), water and cost less (less energy is needed to break the intermolecular bonds hence the cost will be minimised and new products with recycled material would be cheaper). Energy used in metal extraction comes from coal, oil or gas (as high temperatures are needed to break strong Intramolecular bonds). These fuels are non-renewable and are limited. It also releases large amounts of greenhouse gases when burnt which can cause global warming. Water is used extensively in mining during froth floatation (figure 1). This water can be better spent for human consumption as some countries are experiencing drought and this can cause famine (Africa). Also, harmful chemicals used in the extraction of some metals can seep into the soil and water making it toxic to fauna, flora and humans (figure 1. 1). Figure 1. 1: Acid mine water pollution For example, Bauxite (aluminium ore) is mined near tropical forest. This can cause irreversible damage to the environment as natural vegetation is destroyed, leaving soil bare and subjected to erosion. It can scar the land(figure 2)(removing so much soil and rock that leaves a gigantic hole in the landscape) and since many chemical process need to take place before aluminium is extracted, slag (unwanted metals) are left behind and pollutants are released into the atmosphere adding to global warming. Figure 2: Shows a mine that is extracting metals Note: The extensive invasion of the land and that it is irreversible. But recycling aluminium on the other hand doesn’t scar the land. Little to no pollution occurs and natural vegetation and fauna are not disrupted. Large amounts of rubbish are no produced and water is not needed. For every 1 tonne of aluminium that is recycled, 5 tonne of bauxite is conserved. Metals make up a small percentage of the ore. A large percentage of the ore is the gangue (consisting of dirt, sand and other material) which ends up in landfills. This reduces the space for cities to expand, limiting the number of farms and communities that can be developed and cause overcrowding. Recycling metals doesn’t take up space; hence reduces landfill, as scrap metals are mostly recycled back to make new products. Since ores are non-renewable resources (created by the Big bang and there is no way of returning it to Earth’s crust) it is conserved, reducing the amount of mines opened and environmental impacts that it is associated with. As ores high in metal concentration decrease, the cost of processing ever less pure ores increase. To compensate for the increase in less pure ores, more must be mined. This increases the price of ores making it a valuable resource which is expensive to the consumer. Recycling metals helps to lower the prices of these ores, as the metal is reused without having to mine for new ores. Metals are used worldwide for a variety of purposes from soft drink cans to aircraft bodies. Australia has recycled 63% of aluminium cans; nearly two billion cans a year with a total value estimated to be 33 million dollars. America has recycled in excess of 62. 6 billion cans in the year 2004, worth more than one billion dollars back into the economy. Since recycled aluminium is exported to other countries, Australia benefits as it generate large amounts of money; positively impacting on Australia economy and its benefit flowing into society. However, recycling can only be done if used material is collected from scattered location. The ore on the other hand is confined to one location (the mining site); where factories are often close by to produce products from the freshly extracted metals. But once the product hits the shelves it is scattered across many different countries and throughout communities. It is hard to keep track of all these products as some end up in landfill, waterways or in the people’s backyard. Collecting used material for recycling would cost money as trucks are needed to transport scrap metal to recycling centres. Hence energy (fuel) is needed to operate this machinery. In recent years (figure3), the media has focused on recycling aluminium drink cans because they are widely used and commonly dispersed inappropriately throughout the community. E. g. In waterways, storm drains and in the ocean. Recycling of others metal like iron, steel, copper and lead have always been significant but never reported as it is mainly used at an industrial/commercial level rather than by consumers. However since iron rust, it can be returned to the environment, but aluminium doesn’t corrode (if it does, it forms an oxide layer that actually protects it from further oxidation) it ends up in landfill; taking up space. The only way to ‘get rid of it’ is to recycle it so it can be made into new products. Notice that recycling of lead and ferrous materials have decreased Figure 3: Shows recycling metals Notice that when metals are recycled they can be reused to make different products. Recycling is a sustainable process, saving the environment from pollution, money, conserving natural resources and reduces landfill. Energy is also reduced as recycling requires less energy than extracting a metal from its ore. This will ensure that future generations will be able to enjoy a better standard of living. Analyse information to compare the cost and energy expenditure involved in the extraction of aluminium from its ore and the recycling of aluminium The recycling of aluminium is cost-effective and uses less energy compared to extraction of aluminium from bauxite. To extract bauxite, land must be cleared for mining. Heavy equipment like bulldozers, hydraulic excavators and explosives are used to clear and mine the ore. These equipment cost considerable amount of money and use vast amount of energy (fuel) to operate. Transporting trucks, ships, railway cars are used to transport ores to extracting facilities or shipped to other countries; cost money and again energy (fuel) is needed to power these machines. Notice the size of the person compared to the truck.

Essay Religious Study

Essay Religious Study Essay Religious Study Max Weber, the German Philosopher and an author, in his book The Protestant Ethic and the Spirit of Capitalism, theorizes the relationship between the Protestantism and the emergence of capitalism. Weber argues that the religious ideologies of group such as the Calvinist Protestantism paved the way for the rise of the modern capitalism. According to Weber, the two significant theological differences between the Protestant Reformation and the Roman Catholic Church that which brought changes in people’s belief during the 16th century were concerning the value of works and ideas of vocation. In Catholicism, the ideas of value of works require one to perform good work in order to attain salvation. In contrast, Weber found motivation in radical form of Protestantism - Calvinism - and its doctrine of predestination. Calvinist Protestants believe that God has already chosen each person for either eternal salvation or for eternal damnation. Therefore, if a person performed good deeds and were successful it was simply because they were predestined. Unlike in the Catholic practice in which one may also earn salvation through a monastic lifestyle and performing good work for others, Calvinist doctrine of predestination stated that the salvation could not be earned and there was no need of a mediator because of the preor dained fact of being saved or dammed. Weber theorizes that people could make sure, if they were among the elect through worldly activities. Weber interpreted these worldly activities as one being successful at whatever they do. The Calvinist emphasized that for a person to be successful they must invest, make profit, and reinvest all of the profit while living a frugal life. For example, a fruit vendor he re invests his profits back into his business and he was successful in his business, therefore he was chosen for salvation. However, the overall objective for an individual was to achieve the inner satisfaction and assurance that he/she is the one chosen for salvation. Weber argued that

Donne John essays

Donne John essays To say that Blake and Donne do not write uplifting poetry is a great injustice to their works. Although some of their poems discuss themes of depressing nature, on a wider scale both Blake and Donne write poetry which is not only uplifting but also inspiring and extremely worthwhile to read. The two main themes covered by these two writers are love and death. The poems which use love as the main theme inspire the reader and offer hope that true love exists and is not a fragment of their imagination. The feelings that are discussed in these poems are feelings that all people can experience but are difficult to describe and put into words. This is what makes the poetry so worthwhile to read, to see how the feelings that relate to love are expressed and how they are shown with images and other writing styles. A Valediction: Forbidding Mourning by John Donne was written to express his feelings for his lover. The poem talks about the feelings of love being so intense that nothing will ever dull the bond between the two souls. A Valediction: Forbidding Mourning is uplifting because Donne talks of a love so refined that ourselves know not what it is, in other words a love so perfect it cannot be explained. This is what makes the poem because Donne has said the love cannot be explained but then he goes on to explain what the two people are feeling and it is done in a way that can never be reproduced or attempted by other poets. This poem is as perfect as the love it describes. Donne explains how the love that is shared by the two is a love that is not affected by sensory things. care lesse eyes, lips and hands to misse, or dont think that being apart dulls this love, because the love is so strong that even the non-existence of one or both partners cannot bring an end to the intense love felt by both. A Valediction: Forbidding Mourning is also talking about death however it does not affect the uplifting na ...