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Atoms in solids

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  • Innovation in engineering often means the clever use of a new material - new to a particular application, but not necessarily (although sometimes) new in the sense of ‘recently developed’. Plastic paper clips and ceramic turbine-blades both represent attempts to do better with polymers and ceramics what had previously been done well with metals. And engineering disasters are frequently caused by the misuse of materials.

    pdf322p beobobeo 01-08-2012 137 34   Download

  • (bq) part 1 book "instant notes - inorganic chemistry" has contents: atomic structure, introduction to inorganic substances, structure and bonding in molecules, structure and bonding in solids, chemistry in solution.

    pdf157p bautroibinhyen20 06-03-2017 27 7   Download

  • (bq) part 1 book "modern physical metallurgy and materials engineering" has contents: the structure and bonding of atoms, atomic arrangements in materials, defects in solids, the characterization of materials, the physical properties of materials.

    pdf207p bautroibinhyen19 24-02-2017 34 6   Download

  • Diffusion is the transport of matter from one point to another by thermal motion of atoms or molecules. It is relatively fast in gases, slow in liquids, and very slow in solids. Diffusion plays a key rˆole in many processes as diverse as intermixing of gases and liquids, permeation of atoms or molecules through membranes, evaporation of liquids, drying of timber, doping silicon wafers to make semiconductor devices, and transport of thermal neutrons in nuclear power reactors.

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  • (bq) part 1 book "materials science and engineering - an introduction" has contents: atomic structure and interatomic bonding, the structure of crystalline solids, imperfections in solids, diffusion, mechanical properties of metals, dislocations and strengthening mechanisms,...and other contents.

    pdf482p bautroibinhyen18 23-02-2017 43 2   Download

  • (bq) part 1 book "materials science and engineering - an introduction" has contents: introduction, atomic structure and interatomic bonding, the structure of crystalline solids, imperfections in solids, diffusion, mechanical properties of metals, dislocations and strengthening mechanisms,... and other contents.

    pdf482p bautroibinhyen19 02-03-2017 57 1   Download

  • To have a quantum-mechanical treatment we model a crystalline solid as matter in which the atoms have long-range order, that is a recurring (periodical) pattern of atomic positions that extends over many atoms. We will describe the wavefunctions and energy levels of electrons in such periodical atomic structures.  We want to answer the question: Why do some solids conduct curr We want to answer the question: Why do some solids conduct current ent and others don and others don’ ’t? t?...

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  • The new millennium has seen the birth of a new perspective that conflates research in solid-state physics, biological science as well as materials engineering. The perspective is one that recognizes that future new advances in all these areas will be based on a fundamental understanding of the atomic and molecular infrastructure of materials that has resulted from two centuries of chemistry. Major advances will be achieved when the novel behavior, in particular the quantum mechanical behavior, that nanoscale structures possess, can be controlled and harnessed....

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  • The state-of-the-art of controlled radical polymerization (CRP) in 2011 is presented. Atom transfer radical polymerization, stable radical mediated polymerization, and degenerate transfer processes, including reversible addition fragmentation chain transfer are the most often used CRP procedures. CRP opens new avenues to novel materials from a large range of monomers. Detailed structure-reactivity relationships and mechanistic understanding not only helps attain a better controlled polymerization but enables preparation of polymers with complex architectures.

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  • (bq) part 1 book "fundamentals of materials science and engineering" has contents: introduction, atomic structure and interatomic bonding, structures of metals and ceramics, imperfections in solids, polymer structures, mechanical properties, deformation and strengthening mechanisms,...and other contents.

    pdf458p bautroibinhyen21 14-03-2017 44 4   Download

  • This work reports the melting of boride precipitates along the grain boundary of a supposedly solid state welding of a polycrystalline superalloy, and discusses its attendant effect on the hot ductility behaviour of the alloy. Nickel-based superalloy used for this study was previously processed by hot extrusion of argon atomized powered followed by forging. The alloy was solution heat treated at 1120°C, aged at 760°C and subsequently air cooled to room temperature.

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  • This paper investigated the Sr doping effect on the microstructure, chemical stability, and conductivity of Ba1 xSrxCe0.65Zr0.25Nd0.1O3 d (0 6 x 6 0.2) electrolyte prepared by sol-gel method. The lattice constants and unit cell volumes were found to decrease as Sr atomic percentage increased in accordance with the Vegard law, confirming the formation of solid solution. Incor- poration of Sr into the composition resulted in smaller grains besides suppressing the formation of secondary phases of SrCeO3. Among the synthesized samples BaCe0.65Zr0.25Nd0.

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  • The simulation finds a large number of vacancy-simplexes, which plays a role of diffusion vehicle for cobalt atom and varies with relaxation degree. A new diffusion mechanism for tracer diffusivity in cobalt amorphous solid is supposed as follows: The elemental atomic movement includes a jump of neighbouring atoms into the vacancy-simplexes and then collective displacement of a large number of atoms.

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  • Lasers continue to be an amazingly robust field of activity, one of continually expanding scientific and technological frontiers.

    pdf0p echbuon 02-11-2012 58 15   Download

  • Surface effects in film coating Michael E.Aulton SUMMARY This chapter will explain the significance of the stages of impingement, wetting, spreading and penetration of atomized droplets at the surface of tablet or multiparticulate cores. It will explain some of the fundamental aspects of solid-liquid interfaces which are important to the process of film coating. This chapter will emphasize the importance of controlling the ‘wetting power’ of the spray and the ‘wettability’ of the substrate, and will explain how this can be achieved by changes in formulation and process parameters.

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  • Quantum mechanics, shortly after invention, obtained applications in different area of human knowledge. Perhaps, the most attractive feature of quantum mechanics is its applications in such diverse area as, astrophysics, nuclear physics, atomic and molecular spectroscopy, solid state physics and nanotechnology, crystallography, chemistry, biotechnology, information theory, electronic engineering...

    pdf0p cucdai_1 16-10-2012 74 11   Download

  • Most colleges and universities now have courses and degree programs related to materials science. Materials Chemistry addresses inorganic, organic, and nanobased materials from a structure vs. property treatment, providing a suitable breadth and depth coverage of the rapidly evolving materials field in a concise format.

    pdf470p xrzc1-1 18-09-2013 68 9   Download

  • Effects of Structure on Properties Physical properties of metals, ceramics, and polymers, such as ductility, thermal expansion, heat capacity, elastic modulus, electrical conductivity, and dielectric and magnetic properties, are a direct result of the structure and bonding of the atoms and ions in the

    pdf15p liemthanh 16-12-2009 62 3   Download

  • Amorphous materials have attracted much attention in the last two decades. The first reason for this is their potential industrial applications as suitable materials for fabricating devices, and the second reason is the lack of understanding of many properties of these materials, which are very different from those of crystalline materials. Some of their properties are different even from one sample to another of the same material.

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  • Whatever the context, be it solid, liquid, or some transitionary setting, materials science seeks an understanding of a material's macromolecular structure and properties by drawing on knowledge of its atomic and molecular constituents. Until recently, the term ''materials science'' was used primarily to denote empirical study, fundamental research, synthesis, a

    pdf6p anhnangmuahe2013 15-03-2013 43 2   Download

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