Grain size

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Grain size-dependent magnetic and electric properties in nanosized YMnO3 multiferroic ceramics

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  • Tham khảo sách 'grain size effects in nanoscaled electrolyte', kỹ thuật - công nghệ, tự động hoá phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • We present the percolation-theory model for explanation of conductivity of perovskites based on the scaling property of grain boundary formation. Assuming a two-layer simple effective medium model, composed of the grain itself as a first layer and the boundary as a second layer, it was modeled that the net resistivity r of the medium depends on the average grain size L, boundary thickness L’ and boundary fractal dimension D.

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  • Concept taxonomies offer a powerful means for organizing knowledge, but this organization must allow for many overlapping and fine-grained perspectives if a general-purpose taxonomy is to reflect concepts as they are actually employed and reasoned about in everyday usage. We present here a means of bootstrapping finely-discriminating taxonomies from a variety of different starting points, or seeds, that are acquired from three different sources: WordNet, ConceptNet and the web at large.

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  • In this book, we have used both MKS and CGS units. USCS units or FPS units used in the US Edition of the book have been converted to SI units throughout the text and problems. However, in case of data sourced from handbooks, government standards, and product manuals, it is not only extremely di‰cult to convert all values to SI, it also encroaches upon the intellectual property of the source. Also, some quantities such as the ASTM grain size number and Jominy distances are generally computed in FPS units and would lose their relevance if converted to SI.

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  • The application of the nanostructure coatings is seen as the solution of this issue (Voevodin et al., 2005; Yang et al., 2007). According to the Hall–Petch equation, the strength properties of the material rise along with the reduction of the grain size. In case of the coatings deposited in the PVD processes, the structures obtained with grain size ~10 nm cause the obtainment of the maximum mechanical properties.

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  • Nothing contained in any API publication is to be construed as granting any right, by implication or otherwise, for the manufacture, sale, or use of any method, apparatus, or product covered by letters patent. Neither should anything contained in the publication be construed as insuring anyone against liability for infringement of letters patent. Shall: As used in a standard, ““shall”” denotes a minimum requirement in order to conform to the specification.

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  • High hardness and strength of the nanocomposite coatings are due to the fact that the movement of dislocations is suppressed at small grains and in the spaces between them, which causes the appearance of incoherent deformations. When the grain size is reduced to that of nanometres, the activity of dislocations as the source of the material ductility is restricted.

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  • The great advantage of steel as an engineering material is its versatility, which arises from the fact that its properties can be controlled and changed by heat treatment. Thus, if steel is to be formed into some intricate shape, it can be made very soft and ductile by heat treatment; on the other hand, heat treatment can also impart high strength.

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  • There are three methods for hardening copper: grain-size control, cold working, or alloying. When copper is hardened with tin, silicon, or aluminum, it generally is called bronze; when hardened with zinc, it is called brass.

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  • CHAPTER 2 STEEL Robert J. King U.S. Steel Group, USX Corporation Pittsburgh, Pennsylvania 2.1 METALLOGRAPHY AND HEAT TREATMENT 2.2 IRON-IRON CARBIDE PHASE DIAGRAM 2.2.1 Changes on Heating and Cooling Pure Iron 2.2.2 Changes on Heating and Cooling Eutectoid Steel 2.2.3 Changes on Heating and Cooling Hypoeutectoid Steels 2.2.4 Changes on Heating and Cooling Hypereutectoid Steels 2.2.5 Effect on Alloys on the Equilibrium Diagram 2.2.6 Grain Size—Austenite 2.2.7 Microscopic-Grain-Size Determination 2.2.8 Fine- and Coarse-Grain Steels 2.2.9 Phase Transformations — Austenite 2.2.

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  •   There  are  five  Quaternary  sedimentary  sequences  in  the  Red  River  Delta,  Vietnam.  The  forming of each sequence is related to transgression and regression phases. The sequences, which  was  formed  in  transgression  period,  composed  mainly  of  fine  grained  size  leading  to  the  water  bearing capacity is very low and plays a role as aquicludes. Besides, in these fine grain size layers,  the contents of arsenic and iron are high, especially in dark clay, silty clay rich in organic material ...

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  • Nanocrystalline materials have been the subject of widespread research over the past couple of decades with significant advancement in their understanding especially in the last few years [3]. As the name suggests, they are single or multi-phase polycrystals with nano scale (1 · 109 –250 · 109 m) grain size. At the upper limit of this regime, the term ‘‘ultra- fine grain size’’ is often used (grain sizes of 250–1000 nm).

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  • The structural, morphological and optical properties of CBD deposited CdS thin films have been studied by varying the processing parameters and the Cd/S ratio of the starting precursors in order to better understand the growth conditions. The films were characterized by Xray diffraction, SEM, Raman, and photoluminescence spectroscopy. XRD patterns show that asdeposited CdS films were polycrystalline. The grain size are increasing with increasing the Cd/S ratio and/or the deposition time.

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  • Lecture Material science: Part 2 - Mechanical properties of materials presented elastic deformation – bending of beams, hooke’s law, strain, stress, elastic energy, bridges, increasing the yield strength, reduce grain size.

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  • (BQ) Ebook Under the microscope In your Food presents what are you eating? Bread and microfungi, milk and bacteria, yogurt and cheese, fruit, vegetables and grains, magnified meat, meat microbes, pantry pests, what’s in the water? Keeping food safe, inside food cells, size and scale,...

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  • The diseaseFusarium head blight (scab) causes severe problems for farmers and for the industries that use cereals. It is likely that the fungi that cause scab (Fusariumspp.) use various enzymes when they invade grains. We are studying enzymes that the fungi may use to hydrolyze grain proteins. To do this,Fusarium culmorumwas grown in a gluten-con-taining medium from which an alkaline serine proteinase with a molecular mass of 28.7 kDa was puri®ed by size-exclusion and cation exchange chromatographies....

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  • As will be seen later, the commercial farms are the prime focus of the current analysis, as few scavenging birds are likely to have direct grain-feed requirements. The data on current poultry production system, generated by the field surveys, have been used. The data on various aspects such as feeding practices, feed requirements and farm size by type, collected from the surveys by Quasem (2001), have been used. A rapid market survey including a few key-informant interviews was also conducted.

    pdf48p loginnhanh 22-04-2013 16 1   Download

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