Timeline of materials technology BC • 29‚000–25‚000 BC – First pottery appears • 3rd millennium BC – Copper metallurgy is invented and copper is used for ornamentation • 2nd millennium BC – Bronze is used for weapons and armour • 16th century BC – The Hittites develop crude iron metallurgy • 13th century BC – Invention of steel when iron and charcoal are combined properly • 10th century BC – Glass production begins in ancient Near East • 1st millennium BC – Pewter beginning to be used in
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nucleic acid is found within a hollow‚ cylindrical capsid that has a helical structure. The virus that causes rabies is a helical virus. * Polyhedral Viruses The capsid is in the shape of a polyhedron with 20 triangular faces and 12 corners. An example is the poliovirus. * Enveloped Viruses Capsid covered by an envelope. Usually a roughly spherical virus. When helical or polyhedral viruses are enclosed
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Essay 15: What is the purpose of the sensorial materials? Describe the essential qualities needed in a sensorial apparatus. “The first of the child’s organs to begin functioning are his senses....instruments by which we lay hold impressions‚ and these‚ in the child’s case‚ have to become “incarnated”‚ made part of his personality.” The Absorbent Mind‚ Chapter 8‚ p. 84 A child’s journey in life begins as a physical embryo right from the time that he is in his mother’s womb
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can be done by the use of instructional materials. Instructional materials are meant to stimulate pupils’ interest in the classroom for meaningful learning to take place. They also afford the pupils the opportunity to make use of more of their senses in the process of learning experiences which are not available in the classroom or school environment‚ are “brought” to the classroom for pupils’ attention through the use of instructional materials. For example‚ the use of the map of the world in teaching
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SMART MATERIALS 1. Introduction The primary characteristic of a ‘‘smart material’’ is that it has the ability to respond to external stimuli in a technically useful and technically controlled way. The words ‘‘technically useful’’ and ‘‘technically controlled’’ are emphasized since all materials respond to external stimuli of some sort or other (as a simple example‚ all materials respond to temperature by changing their volume)‚ however‚ to be considered a ‘‘smart material’’ the response must
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------------------------------------------------- DENTAL • MATERIALS * Study of physical and chemical properties of the metallic and non-metallic materials used in dentistry OBJECTIVES 1. In order to know the basic physical and chemical properties as they are related to its manipulation by the dentist. 2. To bridge the gap between the knowledge obtained in the basic courses like chemistry‚ physics and its relation… Physical properties: hardness‚ strength‚ brittleness Chemical
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one can find an origin full of history rich with culture and tradition. Although unaware‚ majority of Bangladeshis are still holding on to their simple and authentic traditions. What other way is there to explain the wonderful come-back of traditional clothing and music in new productions? This just proves that we‚ the Bangladeshis have not forgotten our culture or at least are trying to retain it in our everyday life. Unfortunate but true‚ culture has lost its actual charm to most of the world
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CULTURE GOVERNMENT/ HISTORY There are different views in concern to the subject of Australia’s culture and the relations to the government and history. Many claim that Australia’s blend of global influences-the cross-fertilisation of cultures by the dominant political powers of Great Britain‚ the United States‚ and emerging neighbours in Asia. Others argue that separate and distinct Australian cultures have existed for a long time‚ as an example‚ Aborigines. Aboriginal cultures dating back thousands
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Composite Materials A composite is a combination of two or more materials bonded together to gain some overall necessary goods. Types of composite include: laminated materials fibre composites particle composites. A laminate contains thin pieces of material fused together. Common examples are plywood and car windscreens. Wood is durable when exposed to a ductile force equivalent to its grain‚ but if the strength is across the particle it splits simply. A windscreen is made in a parallel way; two
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an overview of the smart materials. The various types of smart material are also presented in this paper. To get the clear idea about the smart materials‚ its definition and types are explained briefly. Some of the types of these include piezoelectric materials‚ magneto-rheostatic materials‚ electro-rheostatic materials‚ and shape memory alloys piezoelectric‚ Varieties of smart materials already exist‚ and research is being carried out extensively to derive new materials. Applications
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