Materials Literature
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The reaction between molybdenum trioxide and molten potassium pyrosulfate was shown by Raman spectroscopy at 430 °C to be a 1:1 reaction. By tempering of the compound, colorless crystals could be formed. The structure was determined; crystal data: Space group = P 2 1 / c, Z = 4, a = 9.0144(3), b = 12.4540(4), c = 8.88…
The structures of potassium borate glasses and melts with 10 and 30 mol %K 2 O have been studied by the use of pulsed neutron total scattering measurement. With an increase in K 2 O content, the first peak of the experimental radial distribution function corresponding to nearest neighbor B-O correlation spread asymmet…
As part of our study program on environmental radiation levels in buildings, we have undertaken to measure the natural radioactivity, such as radium-226, thorium-232, and potassium-40 in various inorganic building materials. The specimens of their materials include cements, aggregates, concretes, asbestos cement slate…
Exciting ferrite cores in a high frequency range, the real part of the complex permeability deteriorates and the imaginary part of it has a peak after starting the deterioration. For a certain Mn-Zn ferrite material, we find that the frequency characteristics of the complex permeability depend on core size, i.e. the r…
Experimental investigations of breakdown in vacuum up to 7.6/spl times/10/sup -6/ Torr in weakly nonuniform fields with lightning impulse voltage of either polarity are reported in this paper. From the oscillograms taken for each impulse voltage application, measured results of statistical time lag, propagation of lea…
I. Techer T. Advocat E. Vemaz Commissariat ~ l'6nergie atomique, CE Valrh6 Marcoule/DCC/ DRRV/SCD, BP 171, 30207 Bagnols sur Cbze, France J. R. Lancelot J. M. Liotard UMR 5566, laboratoire de g6ochimie isotopique cc 066, 5 place E. Bataillon, 34095 Montpellier Cedex 5, France With the concept of a geological repositor…
Abstract A new method for preparing thin sections of wet snow is described. Samples are flash-frozen to immobilise the liquid water content (LWC). Next, the pore space is filled with ester, and the entire sample is frozen to a solid, sliceable block, Micrographs of slices are obtained using transmitted and specular il…
溶融紡糸過程における繊維構造の形成機構に関する最近の進展につき,高速紡糸法を中心に,紡糸過程の計測技術,紡糸線の運動力学,構造形成と紡糸挙動の関係について論じた.さらに,新規な概念に基づく繊維構造制御技術として,液浴を用いた高速紡糸,複合紡糸についても言及した.
The method of installing mixing fans in a free-stall house in order to dry a wet floor was investigated in alaboratory study. A velocity scale on the floor was used as a parameter to evaluate installations. It was found that tiltingthe fan provided more intense airflow near the floor over a longer distance. A tilt ang…
The analysis of liquids to obtain information about semiconductor materials is known in the industry as "wet chemistry" and has been used since the beginning of the production of IC's. However, the analytical procedures never gained any significant attention until the mid 70's when the absolute measurement of phosphor…
Detailed statistical data of stress- and electromigration-induced void formation and growth in passivated Al-lines have been evaluated from in-situ TEM experiments for the first time. Experimental parameters such as grain size (0.5 μm to more than 3 μm, i.e. nearly perfect bamboo structure in the lines), relaxation ti…
Karl Weierstrass (1815-1897) belongs to the outstanding mathematicians who have worked in Berlin. After 13 years as a Gymnasium teacher at remote locations in Prussia far away from the centers of mathematical research, Weierstrass came to Berlin in 1856 at the age of 41 (as professor extraordinarius; he was promoted t…
Ukra na (Otrimano 25 berezn 1996, v ostatoqnomu vigl d | 18 kv tn 1997
The complete reaction of humulene 9,10-epoxide {(2E, 6E)-9,10-epoxy-3,7,11,11-tetramethylcycloundeca-2,6-die, (1)) with m-CPBA produced a hitherto unknown ZR*, 3R*, a*, 7S8, 9S*, 10S
PbX2-PbO-SiO2 (X=Cl, Br and I) glasses were prepared and their electrical properties were investigated. The sole carrier for these glasses is the X- ion, which was estimated from the EMF (electromotive force) of the X2 gas concentration cell and the electrical properties. The ionic conductivity was enhanced with a dec…
Alumina-based ceramic composites prepared by particulate dispersion using SiC and Y2O3 as additives were studied under hot-pressing at 1400 to 1600°C for 0 to 20h. An yttrium aluminum garnet (YAG, Y3Al5O12) phase was formed by the reaction between Al2O3 and Y2O3 above at 1400°C after 10min of hot-pressing, and dense A…
As trials costs continue to rise it becomes increasingly attractive to design and assess fragmenting warheads using a combined approach of numerical analysis and prototype test firings. This paper describes an integrated methodology where three dimensional Computer Aided Design (CAD) data can be used to create prototy…
Low-molecular liquid crystals containing silicon were synthesized. Concerning the purpose of the silicon tow aspects are of interest. Firstly, short siloxane segments are terminally attached to the mesogens which have a rod- like shape or a wedge-like one. This allows us to study the effect of opposite forces, especia…
An experimental study was carried out to determine the standard Gibbs energy of formation of zinc orthosilicate, Δ (Zn2SiO4), for the purpose of controlling zinc vapor pressure by utilizing the equilibrium reaction between Zn2SiO4 and a CO-CO2 gas mixture. A CO-CO2 gas mixture of fixed composition was passed through a…
Longitude effect in the mid-latitude F region is studied in this paper, using monthly median value f<SUB>0</SUB>F<SUB>2</SUB> and f<SUB>0</SUB>F<SUB>1</SUB> observed at Changchun and Urumqi,China from 1956 t…