position by using multiple instead of single pass‚ change the shield gas‚ and improve technique. 5.) INCULSION: are nonmetallic materials‚ such as slag or oxides that are trapped in the weld metal‚ between weld beads‚ or between the weld and the base metal. This causes stresses to concentrate and reduces the structural integrity (loss in strength) of the weld. 6.) NONMETALLIC INCLUSION: are caused under the following conditions: 1.) Slag and/or oxides do not have enough time to float to the
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Lecture 1: Introduction Geology - the study of the Earth‚ the processes that shape it‚ and the resources that could be obtained from it. Main branches Physical Geology - deals with the materials that comprise the Earth and the processes that affect it (e.g.‚ Volcanology‚ Seismology‚ Environmental Geology‚ Engineering Geology‚ Mining Geology‚ Petroleum Geology‚ Mineralogy‚ Petrology‚ Geomorphology‚ Geophysics‚ Geochemistry‚ Planetary Geology) Historical Geology - the study of the origin and
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Biringuccio publishes first systematic book on metallurgy • 1556 – Georg Agricola’s influential book on metallurgy • 1590 – Glass lenses are developed in the Netherlands and used for the first time in microscopes and telescopes 18th century • 1738 – Metallic zinc processed by distillation from calamine and charcoal patented by William Champion • 1740 – Crucible steel technique developed by Benjamin Huntsman • 1779 – Hydraulic cement (stucco) patented by Bryan Higgins for use as an exterior plaster
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Environmental Problems‚ Their Causes‚ and Sustainability Chapter 1 Case Study Living in an Exponential Age • Exponential growth – concept in which a quantity increases at a constant rate per unit of time • Global economic output is a rough measure of the human use of the earth’s resources • Poverty affects environmental quality‚ from the poor depleting and degrading forests‚ grasslands‚ and wildlife • Exponential growth plays a key role in five important and interconnected environmental issues:
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Alchemy is Pretty Freaking Neat; Here is Why: When most people hear the word “alchemy‚” they envision wizards in dark robes chanting incantations over beakers of colored‚ smoking liquids. However‚ alchemy was much more than superstition. Not only does alchemy refer to the creation of gold from non valuable metals‚ but alchemy also refers to the quest to understand the relationship between humans and the cosmos‚ and the quest to use such knowledge to purify the human soul and achieve immortality (Khan
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Lecture 1 - Introduction to Geology GEOLOGY - study of the earth‚ its origin‚ history‚ materials‚ processes and resources Geology as a discipline: a. relevance of time‚ b. issue of scale‚ c. complexity of replicatingnatural systems in the laboratory Main Branches: 1. Physical - study of Earth materials and processes> Volcanology‚ Seismology‚ Environmental Geology‚ Engineering Geology‚ Mining Geology‚ Petroleum Geology‚ Mineralogy‚ Petrology‚ Geomorphology‚ Geophysics‚ Geochemistry‚ Planetary
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CHAPTER 4 AIRCRAFT BASIC CONSTRUCTION INTRODUCTION Naval aircraft are built to meet certain specified requirements. These requirements must be selected so they can be built into one aircraft. It is not possible for one aircraft to possess all characteristics; just as it isn’t possible for an aircraft to have the comfort of a passenger transport and the maneuverability of a fighter. The type and class of the aircraft determine how strong it must be built. A Navy fighter must be fast‚ maneuverable
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10. Where divergent plate boundaries form beneath continental masses‚ low areas known as RIFT VALLEYS form. 11. An interval of geologic time not represented by strata in a particular are is a HIATUS. 12. The two basic types of luster are METALLIC and NONMETALLIC 13. The three types of convergent boundaries are OCEANIC-OCEANIC‚ OCEANIC-CONTINENTAL‚ CONTINENTAL- CONTINENTAL. 14. At a mid-ocean ridge spreading center‚ what happens? The plates are moving away from each other. 15. What principle states
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olfactory sensory abilities that are literally superhuman. Scout or patrol dogs are trained to work in silence and be able to detect snipers‚ ambushes and other enemy forces. Mine detection dogs are trained to find trip wires‚ booby traps‚ and metallic and nonmetallic mines. Explosive detection dogs are used to smell out bombs. “In the war on terrorism a common threat is explosives hidden on a person‚ in a vehicle‚ or roadside location. Explosives Detection dogs are trained to alert on the scent of chemicals
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1) 2) 3) Natural resources and their role in the global economy: the mineral‚ energy‚ land‚ forest‚ water resources Human resources of the world economy and labor migration Scientific and technical resources and information resources 1) 2) 3) 4) 5) 6) 7) By Consumption and resilience: exhaustible non-renewable exhaustible renewable inexhaustible As belonging to the natural environment: Lithosphere resources: minerals land
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