Materials Literature
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The correlation between the phase change and the appearance of ferromagnetism in Ni75−xMnxSn25 alloy was studied. There appeared three kinds of phases with the DO19-type hexagonal, the DO3- and the Heusler (L21)-type cubic structures in this alloy. In each phase, the ferromagnetic Curie temperature, Tc, had a tendency…
The modification B-Nb2O5, theoretically the stable polymorph below ca. 940 K, undergoes no transformation to the high-temperature stable H-Nb2O5 under oxidising conditions, below ca. 1 220 K. Reducing conditions facilitate the transformation. At or below 1 020 K, B-Nb2O5 is reduced directly to NbO2, without traversing…
The thermal decomposition and the glass transition temperature of poly p-methoxystyrene (PpOMeS) were studied with a (DSC-2) differential scanning calorimeter. The undecomposed and decomposed polymers were analyzed by gel permeation chromatography for molecular weight distributions and by DSC-2 for changes in the poly…
Uranium-plutonium mixed monocarbide pellets, which had densities over 90% T.D. and near-stoichiometric compositions, were fabricated in the gloveboxes of the atmosphere of purified Ar. The carbide powder was first synthesized by reducing mechanically blended oxides with graphite at 1,510°C in a vacuum of 0.2 Pa. This…
Kinichilite, a new mineral from the Kawazu mine, is hexagonal with a=9.419 Å, c=7.666 Å, space group P63 or P63⁄m. The empirical formula derived from the chemical analysis is: (Fe2+1.13Mg0.47Zn0.43Mn2+0.17)Σ2.20(Te2.97Se0.03)Σ3.00 O9.00(H1.38Na0.22)Σ1.60·3.2H2O, corresponding to Fe2+ dominant analogue of zemannite.It…
An artificial crevice has been developed which enables the measurement of the pH and potential to be made at three locations in the crevice. Experiments have been conducted using the steel BS 4360 50D in 3·5% NaCl and in artificial sea water. The crevice specimen was coupled to a steel section of much larger area loca…
Abstract The effect of the partial pressure of gaseous ammonia on differential thermal analysis and thermogravimetric curves of ammonium nitrate has been determined. Observed variations of the thermal effect and decomposition rate constitute a basis for considering the factors which determine the decomposition and equ…
A total of 170 patients were treated--137 only with the herb combination (78 with duodenal ulcer and 59 with gastroduodenitis), 33--with the herb combination together with antacid (21 with duodenal ulcer and 12 with gastroduodenitis). As a result from the treatment, the spontaneous pains disappeared in 90 per cent of…
The role of high-speed steel as a cutting tool material is described. The choice of grades for various applications is strongly influenced by economic considerations as affected by alloy availability and cost. While the heat treatment applied to the finished tool is critical in achieving the desired properties, many f…
Calculations of sink strength and bias are presented for arrays of edge dislocations constituting low-angle grain boundaries or deviations from perfect coincidence misorientations in high-angle grain boundaries. It is shown that the sink strength of an array increases as the dislocation spacing decreases: this also ca…
Morphological changes in pheochromocytoma (PC12) cells induced by administration of nerve growth factor (NGF), dexamethasone, 5-OH-DA and 6-OH-DA were examined by fluorescence histochemistry and electron microscopy. 1) After 8 days of incubation with 2.5 S NGF (0.1 pg/ml), the branching processes of PC12 cells showed…
Abstract Cellulose and the various starches were dried in vacuum line apparatus, deuterated in liquid deuterium oxide, and dried in the same apparatus. Their accessibility was determined by measurement of the maximum absorbance (a) and the integral absorbance (b) at the wave number of each OH and OD group band on the…
An investigation is made of the stability of the shape of a moving planar interface between the solid and liquid phases during the solidification of a pure substance. The prototype problem of controlled two-dimensional growth of a pure solid into a thermally undercooled liquid bath is considered. The model employed po…
A bimolecular process on dry silica gel, the photodimerisation of acenaphthylene, has been accomplished, both by direct excitation and by sensitisation, and its behaviour compared with that in solution and that expected for a two-dimensional fluid model.
Energy, temperature and electron current dependence of the contamination rate have been examined experimentally. When the density of the electron current irradiating a specimen is of the order of 10−3 A/cm2, the contamination rate is inversely proportional to (v/c)2, where v and c are the velocities of electrons and l…
Chabourneite, Tl₂₁(Sb, As)₉₁S₁₄₇ is triclinic, P1, with a = 16.346, b = 42.602, c = 8.534 Å, α = 95.86°, β = 86.91°, γ = 96.88°, Z = 1, Dx = 5.121 g.cm⁻³. The strongest lines in the powder pattern are : 4.196(5) (0.10.0 ; 2.8.0), 4.067(6) (0.[-4].2 ; [-4].2.0), 3.928(7) ([-4].4.0), 3.573(10) (2.[-6].2 ; 2.10.0), 3.485…
Abstract The volumetric behaviors of cholesteryl oleyl carbonate (COC) and cholesteryl oleate(CO) were investigated around the smectic(Sm)-cholesteric(Ch) and cholesteric-isotropic(I) transitions by using chromatographically purified materials. Both transitions showed marked pretransition phenomena in COC and CO. The…
The design and use of kinetic energy marine sediment penetrators require a capability for predicting penetration depth. A natural test target of soft saline clay deposits was chosen for its similarity to marine sediments, and 35 instrumented penetrator tests were conducted. An equation was developed to fit the data wi…
The H2–D2 kinetic isotope effect was measured on a Ru/SiO2 catalyst not only for the hydrogenation of CO but also for the hydrogenation of deposited carbon formed bv disproportionation of CO; similar inverse kinetic isotope effects were observed in both cases, which led to the conclusion that the rate-determining step…
It is demonstrated theoretically and experimentally that the direct and converse piezoelectric coefficients. ∂P/∂σ and ∂ε/∂E, are not equal as is generally believed. The correct relationship between these coefficients is derived, and it is shown that the experimentally measured quantities analogous to the piezoelectri…