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Quantum Cryptography, 2007.
An overview of the use of and the theory behind quantum cryptography.
1,906 words (approx. 7.6 pages), 8 sources, MLA, $ 60.95
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Abstract
This paper examines how quantum cryptography is a fast growing form of encryption that is not based upon the difficulty of mathematical algorithms and instead employs quantum physics to encrypt information on the physical level. It emphasizes the need for an innovative cipher as well as the need to inform the IT community regarding the commercial application of quantum cryptography. It also provides a broad overview of the quantum cryptographic protocol and operation using fiber optic media.
From the Paper
"The integrity of information between sender and receiver relies upon secure channels and more importantly the ability to protect the information from unauthorized recipients. The transmission of information can be compromised when a third party listens in on the transmission media measuring the physical object. Consequently, the eavesdropper can effectively intercept the contents of a communication. Certain types of classical cryptography have proven vulnerable to the interception of data and the incident can remain undetected during the entire transmission. This idea of a man-in-the-middle attack on communication media using quantum cryptography is not possible due to the laws of quantum mechanics. Quantum superposition's and quantum entanglement are two properties of quantum physics used to detect eavesdropping. "
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Introduction to Quasicrystals, 2007.
An introduction to quasicrystals, looking at their discovery, symmetry, properties and applications.
3,259 words (approx. 13.0 pages), 8 sources, MLA, $ 93.95
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Abstract
This paper discusses crystallography, which is the scientific study of crystals. The paper specifically introduces quasicrystals and discusses their discovery in 1982. The paper goes on to analyze the properties, symmetry and application of quasicrystals, looking closely at how they differ from classical crystals. The paper includes many diagrams to illustrate its points.
Table of Contents:
Classical Crystals and Quasicrystals: An Overview
Quasicrystals in Focus
Symmetry of Quasicrystals and the Concept of Higher Dimensional Space
Types of Quasicrystals
Structure Models, Structure Solution Techniques, and Software Modeling
Properties of Quasicrystals
Applications of Quasicrystals and Research Areas in Quasicrystallography
From the Paper
Crystallography, the scientific study of crystals, can be traced as far back as the 17th century, when scientists such as Johannes Kepler and "Robert Hooke published works presenting ideas on the microscopic structure of crystals. Numerous studies in this field resulted in the systematized discipline of crystals as it is known today. Following these developments, "crystallography" evolved from "the scientific study of crystals" to "the experimental science of determining the arrangement of atoms in solids." This evolution to cover all possible atomic arrangement was inevitable especially with the discovery of solids that cannot be confined within the conventional definition of a crystal."
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Lead-Tin Phase Diagram, 2004.
Examines an experiment that involves a phase diagram.
975 words (approx. 3.9 pages), 1 source, MLA, $ 34.95
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Abstract
The experiment discussed in this paper aims to generate experimentally the lead-tin phase diagram from various proportions of the two metals in this binary system. It involves the preparation and heating in a test tube of mixtures containing 90%Pb-10%Sn, 80%Pb-20%Sn, 60%Pb-40%Sn, 40%Pb-60%Sn, and 20%Pb-80%Sn. The paper explains that the experiment requires the use of a thermocouple to monitor the temperature reading every 5 seconds until it drops off to 160 degrees C. Five cooling curves (temperature versus time), 1 for each mixture are generated, taking notes on the points of arrest and the critical temperatures. The paper shows that the integration of all the cooling curves produces the lead-tin phase diagram. The paper includes diagrams.
Paper Outline:
Abstract
Introduction
Experimental Section
Preparation of Set up and Samples
Experiment Proper
Results and Discussion
Conclusion
Recommendations
References
Appendix
From the Paper
"The simplest phase diagrams are those of the binary alloys, a binary alloy being one that contains two components. In this type of phase diagram, temperature and composition are the variable parameters, the temperature usually being relegated to the y-axis and the composition to the x-axis (where the two composition scales of the two components run opposite to each other in magnitude, the 100% composition of each component coinciding with the 0% composition of the other component, and vice versa)."
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Sintering, 2004.
Examines the sintering of Cu and Cu-Zn pellets and recrystallization of brass.
2,750 words (approx. 11.0 pages), 5 sources, MLA, $ 82.95
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Abstract
Sintering, which is a stage of powder metallurgy, is a thermal process that creates inter-particle welds. It is where powder compacts are annealed in a controlled atmosphere to a temperature at which solid-state diffusion occurs. On the other hand, recrystallization is the process of the formation of new strain-free grains from initially cold-worked grains. This paper examines an experiment that had, as its objectives, the intention of examining of the effects of sintering and recrystallization on the microstructure and the hardness of the specimens. The samples used are copper and copper-zinc powders for sintering and brass for recrystallization. The paper shows that the copper and copper-zinc powders are compacted and are sintered in a nitrogen-containing atmosphere at different temperature and time settings. The brass samples are cold-worked and are annealed at different temperature and time settings. The paper includes tables.
Paper Outline:
Abstract
Introduction
Experimental Section
Results and Discussion
Conclusion
References
From the Paper
"When a polycrystalline metal is cold worked, the grain boundaries act to interrupt the slip processes that occur in the crystals. The lattice adjacent to the grain boundaries is much more distorted in the center of the grains. Decreasing the grain size increases the grain boundary area and, as a consequence, the volume and the uniformity of the distorted metal. This effect decreases the number of possible sites of nucleation and, therefore, the smaller the grains of the metal before cold work, the greater will be the rate of nucleation and the smaller the recrystallized grain size for a given degree of deformation."
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Heat Treatment of Steel, 2004.
Examines a process that increases the hardness of steel.
1,354 words (approx. 5.4 pages), 3 sources, MLA, $ 45.95
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Abstract
When steel is heat treated, the size and morphology of its phases are changed. The samples used in this paper are AISI 1045 and 4140 steels. Four samples each of AISI 1045 and AISI 4140 are shown to be subjected to annealing and quenching while eight samples of AISI 1045 are subjected to tempering. Photomicrographs and hardness of each sample are taken. From the results, the paper shows that quenching increases the hardness of steel and increasing the cooling rate increases the hardness of the sample due to the formation of fine grains of pearlite. Increasing the tempering temperature reduces the hardness of a specimen. The paper includes graphs.
Paper Outline:
Introduction
Experimental Section
Results and Discussion
Conclusion
References
From the Paper
"Theoretically, a quenched specimen should be harder than tempered specimens. This is due to the interstitial carbon atoms that deter dislocations along the lattice. The relatively higher hardness of a quenched specimen may also be attributed to the few slip systems of the BCT crystal structure. From the microstructure, the trapped carbon atoms are evident as the black regions."
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Economic Thermodynamics, 2006.
A discussion regarding thermodynamics and economics.
1,350 words (approx. 5.4 pages), 4 sources, $ 53.95
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Abstract
This paper discusses the question of including thermodynamics in the study of economics. It is very important to include it when studying neo-classical economics and free-market activity because it alone seems capable of introducing consumption pattern analysis into the study of economics. Thermodynamics is important within ecological economics and within economics in general because the environment within which all economies function is anchored in a finite system that is constrained by its very nature and character.
From the Paper
"Resources are limited and many are not reproducible in any type of practical natural sense that would allow even sustainable growth models to be applicable. Petroleum will eventually be completely depleted and the natural process of producing it is simply not a practical option that would result in sustainable consumption patterns. "
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The Nantucket Sound Wind Farm Proposal, 2006.
This paper discusses the Nantucket Sound wind farm proposal, and it's value to the USA.
675 words (approx. 2.7 pages), 5 sources, $ 26.95
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Abstract
This paper discusses the issues of should the Nantucket Sound wind farm be allowed to proceed and do the apparent benefits outweigh the risks that opponents have outlined? In a word: yes. According to the paper, the Nantucket Sound wind farm proposal should move forward in its development. It represents a renewable source of clean electricity that has minimal impact upon the region--both environmentally and economically. The coming years will see ever-increasing costs for nonrenewable sources of electricity such as coal and natural gas. The Nantucket Sound region has the ability to produce much of its own electricity, cheaply and efficiently. The region should take advantage of that resource.
From the Paper
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Development of Science, 2006.
This paper looks at the development of science and technology as it relates to the effects of World War II.
675 words (approx. 2.7 pages), 3 sources, $ 26.95
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Abstract
This essay examines and discusses the impact of World War II on the development of science and technology. The discussion includes several examples, mainly pertaining to the development of nuclear science, weapons, medical research and genetics. The writer points out that since the end of World War II there has been an almost complete merger of science and technology, and governments and the industry now support most pure science research. Further, the writer notes that according to McClellan and Dorn, the example of the atomic bomb development in the US during World War II marks a watershed in the history of modern science and technology.
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Electrical Stimulation, 2006.
A discussion regarding electricity and the role it plays in the field of medicine.
675 words (approx. 2.7 pages), 6 sources, $ 26.95
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Abstract
This paper discusses how with the advent of electricity in the 19th Century, there came many changes to the field of medicine. Some of these were quack remedies or methods (such as electroshock therapy) which have fallen out of favor. Yet, today, there are still applications for electricity and electrical stimulation that are used in medicine. This paper summarizes the research and activity being done regarding the following topics: electricity in medicine, electrophysiology, electrotherapeutics, magnetic fields and neural stimulation. The paper further relates each of these areas to the human brain.
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Seyyed Hossein Nasr: His Life and Ideas, 2006.
A review of the life and history of Seyyed Hossein Nasr.
1,125 words (approx. 4.5 pages), 5 sources, $ 44.95
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Abstract
This paper discusses the life and history of Seyyed Hossein Nasr, born in 1933 in Tehran to a relatively wealthy family that was able to provide him with a premier education. According to this paper, Nasr used that education well. He was sent to the United States to study at the age of twelve in 1945, where he would spend the next thirteen years. During his time in the United States Nasr expanded his working knowledge into many fields. He did undergraduate work in physics and graduate work in geology geophysics and the history and philosophy of science. The paper further discusses how the sciences proved too limiting for Nasr. Using his extensive knowledge of the Western scientific process and its consequent secularism, Nasr made a career out of challenging these fundamental Western ideologies.
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