Materials Literature
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Because of high surface tensional force of molten copper, air atomized copper powders show spherical shape, and such powders have poor pressing properties, exhibiting low green strength.In the manufacture of porous bronze bearing, it is necessary to use copper powder of a substantially lower apparent density, with goo…
From the viewpoint of the surface renewal theory or the film penetration theory, mass transfer in a liquid film was considered.The theoretical equation (6) based on the surface renewal theory was derived by assuming that the surface age distribution should change with contact time and moreover that the liquid surface…
Specimens of the permanent magnet alloy “Vicalloy” composed of 2∼6% Cr, 6∼10% V, 52% Co and balance Fe were reduced to 93% by cold rolling and subsequent tempering at temperatures between 20° and 800°C. The measured magnetic properties were saturation induction, residual induction, coercive force and magnetic torque.…
MnAl alloy is most succesfully melted by high frequency induction furnace under argon atmosphere in alumina crucible. The alloy containing 68 to 70 wt% of Mn exhibits the highest saturation magnetization in this system. Ferromagnetic phase (π-phase) can be prepared by quenching and subsequent tempering. The adequate q…
Introduction. The first and second occurrences of kotoite, Mg3(B03)2, were reported by the first author from
3ZnO・Cr2O3およびZnO・2Fe2O3の触媒に活性減衰防止の目的で,活性炭,シリカゲル,ZnCl2等を添加して,酢酸ビニル合成反応を実験し,その効果を検討した。その結果,もっとも減衰防止に効果的な物質はZnClであることを知った。また3ZnO・Cr2O3とZnO・2Fe2O3触媒に対する担体の効果が活性炭とシリカゲルとで相反することは興味深いことである。これらの実験結果から結局80ZnO・160Fe2O3・32SiO2・11MnO2-5ZnCl2・V2O5の組成の触媒を得た。この触媒は温度250℃,アセチレンと酢酸とのモル比を1とし,SV=1700/hr,触媒量50mlの反応条件で,連続100時間にわたる長時間反応の後にお…
Proton magnetic resonance spectra of single crystals of two Tutton's salts, K2Zn(SO4)2·6H2O and K2Mg(SO4)2·6H2O, have been studied and the orientations of the water molecules in the structure have been determined. Using the heavy-atom structure of (NH4)2Mg(SO4)2·6H2O as determined by x-ray diffraction, a system of hyd…
One of the primary reasons for the failure of thermionic converters to attain their ultimate theoretical performance is electron transport effects occurring in the interelectrode spacing. Two major types of transport effects, electron scattering and electron space charge, are discussed and theoretical results compared…
Neutron diffraction study of the atomic and spin arrangement of the κ phase of ternary' alloys Cu 20 –Mn 30+ x –Al 50- x ( x =0 5 and 10) has beed performed. It is shown that, for alloys x ≠0, excess Mn atoms replace Al atoms at body center sites of CsCl type crystal lattice, and their spins couple antiparallel with t…
Irradiation of halophosphate lamp phosphors by a low‐pressure mercury arc causes a loss in luminescent efficiency, changes in the absorption spectra, and thermoluminescence. The 1849Aå wavelength is primarily responsible for these changes, which are partially reversed by longer wavelength radiation or by heat. X‐radia…
G. D. Palkar, D. N. Sitharamarao and A. K. Dasgupta, Trans. Faraday Soc., 1963, 59, 2634 DOI: 10.1039/TF9635902634
Abstract not Available.
D. C. Nonhebel, J. Chem. Soc., 1963, 1216 DOI: 10.1039/JR9630001216
Abstract The seeds of Mallotus philippinensis (Lam.) Muell.‐Arg. were found to contain 4 cardenolides (A, B, C and D) after fermentation. Two new glycosides, C and D, were obtained in crystalline form and were shwon to be corotoxigenin‐rhamnoside and coroglaucigenin‐rhamnoside respectively. The minor constituents A an…
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Oxygen present in cuprous iodide greatly increases the electrical conductivity. Copper films were formed with differing oxygen contents by copper vapor condensation at various oxygen pressures. After iodination to the conductivity was found proportional to the 1/8.4 power of the oxygen pressure during condensation. Cu…
Abstract Preliminary observation is made of the absorption spectra of four alkali halides (LiF, NaCl, KCl, and KBr) at various intervals after bombardment, at room temperature, with a 2 microsecond pulse of 2 MeV electrons. The absorption is measured spectrographically using an underwater uranium spark light source wh…
Abstract The melting transitions of natural rubber, cis ‐polyisoprene, gutta‐percha, balata and synthetic trans ‐polyisoprene, and cis ‐polybutadiene have been examined by means of differential thermal analysis. Natural rubber melts over a wide range of temperature giving several transitions, the magniture and tempera…
<div class="htmlview paragraph">The inherent advantages of quiet operation, few moving parts, and compact and lightweight construction make thermoelectric generators desirable for powering certain specialized military equipment. Recent developments in thermoelectric materials, couple designs, and couple compartm…
R. Hodges, S. G. McGeachin and R. A. Raphael, J. Chem. Soc., 1963, 2515 DOI: 10.1039/JR9630002515