Abstract This paper reviews and discusses the origins of metallurgy. According to the paper, metallurgy has been around for centuries on many different continents, in many different cultures and used in a vast array of various methods. According to the paper, one of the first 'modern' metallurgists was a German called Georgius Agricola.
From the Paper "One of the first 'modern' metallurgists was a man by the name of Georgius Agricola, who actually began his career as a small-town teacher of Latin and Greek. This quickly became to boring for him causing him to travel to Italy were he would spend three enlightening years of study, particularly in the field of medicine. "
"It was probably while studying there that he became familiar with the works of the Roman physician, Galen "who in the course of his descriptions of his visits to Cyprus to collect materials for his medicines incidentally mentions some metallurgical processes for the sublimation of zinc ores to produce zinc oxide to act as a salve" (Craddock 1994 pg 67)."
Abstract The paper discusses civilization's development in terms of use of metals in tools through the art of metallurgy. The author looks at how metal tools became more and more effective and productive over time, and examines such ancient civilizations as the Sumerians and Egyptians.
From the Paper "Trade, metallurgy, and mining are still some of the most important industries in the world. Early civilizations created the foundation of our civilization today. They developed elementary political, economic, and social structures based on large groups living together. They are the backbone of modern civilization. Early civilizations mirror our own in many ways, and created the lifestyle of living in the city. Our cities are larger, but the fundamentals that were shaped by early societies as they developed are still part of our culture today."
Abstract This paper studies the Bronze Age which was one of the great eras of our European past. It describes the widespread adoption of bronze metallurgy across Europe at the time, as well as the many technological advances. It examines the levels of literacy as well as the society and the writings of the Bronze Age scribes. It also discusses "The Linear B Decipherment" and how Evans continued to study it after the Balkan War. Finally, the paper concludes that the effects of writing and literacy on society were great and significant.
From the Paper "Anthropologists and archaeologists call certain societies "iron age" or ?bronze age.? In doing this they recognize that the properties of the main metal used by a society's technology greatly affect both its use and through this the nature of that society. For instance, bronze unlike iron is too soft to be used for ploughing; it is an alloy. Bronze can be smelted at lower temperatures than iron which need specialized supplies of charcoal. All these facts affect societies which use bronze and iron. For example, since bronze cannot be used for ploughing these societies cannot produce in many regions the large agriculture surplus iron societies can; since bronze requires tin bronze age societies had to trade, etc. (Claiborne, 1974) I believe the same parallel exists between the different characteristics of different writing systems and its use as a communication technology in a society."
Abstract This paper explains the various techniques used by aircraft accident investigating teams today. The writer explains the technical terms for the layman, which include accident scene photography, metallurgy, fluid analysis of fuels and oils, fire investigation in flight or on the ground occurrence, human factors, flight deck design, appropriate degree of automation, automatic overwing exit, human forensics and pathology, and flight data recorders.
From the Paper "Aviation accident and incidents are extremely painful and expensive for the aviation industry. This is why the aviation industry has investigative engineers who hold the responsibility of investigating accidents by reviewing and identifying the primary cause of the accident, whether it was related to aircraft performance such as, aerodynamics, engines, electrics, hydraulics, or if it was environmental or simply human error.
Investigating aircraft accidents can be extremely complex, sometimes taking many months to figure out the cause of the whole accident. So for the purpose of this task, there are engineers who often collaborate to work in teams in conducting the investigations. Primarily they are solely responsible licensed Professional Engineers, hired by the FAA Air Transport."
Abstract This paper begins by illustrating the process most commonly used to remove hydrogen sulfide from natural gas. The paper then goes on to describe an alternative method used for the removal of hydrogen sulfide and describes the benefits of this method, as well as some of the problems associated with it. Additionally, the paper points out that the water content of natural gas is an important engineering consideration concerning the sweetening process and presents an overview of the properties of pure acid gases and water and hydrogen sulfide. The paper then goes on to outline and explain additional processes and engineering considerations concerning the removal of hydrogen sulfide and includes some cost estimates and comparisons of the processes.
Properties of H2S and CO2
Vapor / Liquid Properties of Pure Compounds
Vapor / Liquid Phase Behavior
Acid Gas Compression and Dehydration
Metallurgy Acid Gas Dehydration
Acid Gas Injection Facilities
Cost Comparisons with Small Scale Sulfur Recovery Options
Operating Costs
From the Paper "Sour natural gas contains hydrogen sulfide (H2S), which has to be removed to meet specifications for sales gas. Sour natural gas also contains carbon dioxide (CO2). The removal of CO2 and H2S, usually called acid gases, from sour natural gas is generally accomplished by means of a regenerative solvent. There are several amine solvents used for this purpose. Upon regeneration of the solvent, the acid gases are liberated, and are usually sent to a modified Claus plant, where the H2S is converted to elemental sulfur (Canjar & Manning 1967). The acid gas stream to the modified Claus plant consists of H2S, CO2, water vapor and minor amounts of hydrocarbon gas."
Abstract The writer of this paper give a detailed overview into the technical workings of specific rifles and cannons which were used during various wars in the U.S. between 1776-1918. This paper probes the effectiveness of the rifle and cannon which were driven by new innovations in metallurgy, chemistry and ballistics during the 19th century. Specific weapons and firearms reviewed in this paper include: Breechloading rifles and cannons, flintlock rifle and conoidal bullets.
From the Paper "The flintlock rifle had a slower rate of fire than the musket, but was superior in accuracy and range. The rate of fire was slowed because of the complicated loading process. Each bullet was hammered into the barrel with a mallet, adding gunpowder in a separate action. Nonetheless, it was the dominant weapon in the American Revolution, and the rifle and rifleman became common in Europe as a result."
Tags: firearms, technology, rifles, guns, cannons, war, u.s., history
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."
Abstract This paper describes some of the many technological advancements that took place in China prior to the fourteenth century under the Shang and Chou dynasties. The paper relates that under Chinese Shang rule, bronze metallurgy was developed that then evolved into the development of blast furnaces and advanced iron-casting capabilities. The paper also discusses the development of a distinctive writing system and examines China's contributions to the lives of Europeans. This included the glazed pottery known as china or porcelain as well as other inventions of the compass, paper, gun powder, natural gas, mechanical clocks and row planting.
From the Paper "The era of the Shang and Chou dynasties represent the formative years of Chinese history. Prior to this period, China was politically unified, yet comparable to India before its unification by the Mauryan Dynasty. This was the time when a majority of China's cultural traditions that exist today materialized. For many centuries, the country of China was in an isolated state away from other civilization, seas, deserts, and mountains. This helps to explain the originality and uniqueness of the Chinese culture. China's transition from Neolithic culture to civilization was complete with the establishment of Shang rule over most of North China in addition to the first written texts ("Notes on China")."
