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991.
992.
Various heat insulation materials produced at home and abroad are compared. The advantage of using natural nano-structured
materials is substantiated.
Translated from Novye Ogneupory, No. 7, pp. 41–44, July 2008. 相似文献
993.
A. E. Lapshin Yu. F. Shepelev Yu. I. Smolin E. A. Vasil’eva 《Glass Physics and Chemistry》2008,34(2):182-186
The distribution and structure of tellurium nanoclusters synthesized in crystal channels of the porous silica ZSM-11 are investigated
using the maximum-entropy method and the Rietveld analysis. It is shown that the intercalated tellurium atoms are arranged
in channels of the ZSM-11 zeolite not randomly but in the form of scraps of infinite chains similar to those observed in massive
tellurium. The distances between the nearest neighbor tellurium atoms vary in the range 2.53(4)–2.70(3) ?. The clusters Te4 are formed at the intersections of channels in the structure. These clusters have the form of distorted tetrahedra in which
the tellurium atoms are separated by distances of 2.53(4) and 2.90(4) ?.
Original Russian Text ? A.E. Lapshin, Yu.F. Shepelev, Yu.I. Smolin, E.A. Vasil’eva, 2008, published in Fizika i Khimiya Stekla. 相似文献
994.
995.
V. I. Bochenin 《Coke and Chemistry》2008,51(4):144-146
Coal concentrate with minimum moisture content is used for coke production in metallurgy. At various enterprises, the moisture content is determined by weighing [1]. However, this method is slow and is undertaken in the laboratory. To reduce the loss of production, accelerated monitoring of the moisture content in industrial conditions is required. 相似文献
996.
The possibility is demonstrated of using an addition of periclase-chromite filler (PCF) prepared from PCF grade broken material
articles in medium-cement concrete with chamotte filler. The effect of this addition on cement hardening duration, strength
and heat resistance is considered.
Translated from Novye Ogneupory, No. 8, pp. 42–46, August 2008. 相似文献
997.
998.
A very important characteristic of coking coal is its clinkering ability, i.e., its ability to form a nonvolatile solid residue, consisting of disparate grains, on heating in specific conditions. The clinkering ability of the coal is determined by the properties of its plastic mass. Various methods may be used to evaluate the plastic-ductile properties of the coal. However, since the 1930s, the main method used to evaluate the clinkering properties of coal, within the nations of the former Soviet Union, has been the Sapozhnikov-Bazilevich plastometric method, because it provides more information than competing approaches. For the same reason, the thickness of the plastic layer, which is one of the parameters determined by this method, is used for coal classification in State Standard GOST 25543-88 (Lignite, Coal, and Anthracite: Genetic and TEchnological Classification) and its Ukrainian counterpart DSTU 3472-96 (Lignite, Coal, and Anthracite: Classification). This explains the strict requirements on the accuracy and reliability of the plastometric characteristics. 相似文献
999.
A technique is proposed for introducing microdoses (10?5–10?10 g) of germanium and indium metals into semiconductor compounds by coulometric titration in a solid electrolyte cell. The solid electrolytes that are reversible with respect to germanium cations (the GeSe-GeI2 system containing 5 mol % GeI2) and indium cations (the InCl3-MgCl2 system containing 15 mol % MgCl2, the InCl3-CdCl2 system containing 1.5 mol % CdCl2, and the In2S3-InCl3 system containing 5 mol % InCl3) are chosen, and their electric transport properties are characterized. The optimum conditions for electrochemical doping (temperature, current density), under which the current efficiency reaches 90–100%, are determined. The doping with germanium and indium is performed for nonstoichiometric compounds, such as lead monotelluride, indium sulfide, and ternary chalcogenide spinel Cd1 ± δCr2Se4. The doping efficiency is controlled by measuring the electromotive force of the corresponding electrochemical cells and the Hall effect, as well as using the electrical conductivity method. The solid electrolytes that are reversible with respect to indium are used to determine the standard Gibbs energies of formation of a number of indium-containing semiconductors. 相似文献
1000.
Hung-da Wan F. Frank Chen 《The International Journal of Advanced Manufacturing Technology》2008,38(9-10):995-1005
A Kanban system facilitates lean principles in a simple and effective way. While reportedly successful in many manufacturing firms, the conventional Kanban systems using physical cards suffer from human errors, limited tracking capability, and so on. To make the information flow leaner, software providers add new features to their existing programs for manufacturing systems to computerize Kanban activities. As Web-based technologies advance rapidly, developing an entirely Web-based Kanban system appears to be feasible and promising. This paper presents the advantages, limitations, and challenges of Web-based Kanban systems. An experimental program has been developed based on PHP+MySQL, a popular Web programming platform. The server-executed program features cross-platform compatibility, real-time tracking and performance monitoring, and greatly enhanced information contents compared to physical Kanbans. Human errors are minimized by the automated transactions; nevertheless, the interfacing and data maintenance require further research efforts. 相似文献