Materials Literature
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A new method for the preparation of manganese violet is reported and the formula confirmed as manganese(III) ammonium pyrophosphate by wet analysis, X-ray powder diffraction, infrared spectroscopy, thin-layer chromatography, and magnetic measurements. The thermal decomposition has been studied and thermogravimetric cu…
Die fossilen Diatomeen aus dem Villafranchien bei Senèze (Haute- Loire) wurden bei einer Bohrung durch den Boden des alten Kratersees hindurch untersucht. 110 Meter ton-sandiger diatomeenführender Sedimente enthalten eine Süsswasserflora die aus 107 Arten und Varietäten besteht ; 5 Formen sind neu und sie werden in di…
Abstract The isotopic exchange of P 32 and Ca 45 with hydroxyapatite was studied along its solubility isotherm. The solution was in a chemical equilibrium with the solid, thus, only isotopic exchange reactions took place in the system. Isotopic dilutions during the exchange process enabled the measurement of a compart…
When a mixture of chloride or sulfate salts of cesium and dysprosium in a 3:1 mole ratio was treated with fluorine gas at 10-60 psig and 200°-350°C, the white Dy(III) starting material was converted to an orange compound with an empirical formula approaching Cs3DyF7. Fluorescence and infrared absorption spectra of flu…
The current drop-weight test methods for evaluating the compatibility of materials with liquid oxygen under impact are briefly discussed, with particular emphasis upon the characteristically poor repeatability of the “threshold value” impact sensitivity ratings yielded by these methods. It is pointed out that this tra…
The assignment of group frequencies in the i.r. spectra of derivatives of aluminium borohydride has been made by the use of aluminium borodeuteride. Variations in the spectra with the change of ligand are discussed. The properties of the compounds in solutions have been studied using 1H n.m.r. spectroscopy, and data o…
Abstract The unit‐cell dimensions of the compounds AB 2 X 5 with A = K, Rb or NH 4 ; B = Pb or Sr and X = Cl or Br have been determined. The alkali strontium chlorides are isostructural with the alkali lead chlorides and bromides.
This investigation shows that below a certain value of the maximum pressure in the region of contact, fatigue cracks are not initiated. This critical value of the maximum pressure is lower the greater the area of contact. In alpha brass the rate of crack initiation increases with increasing values of the maximum press…
The effects of carbide particle sizes and amounts of undissolved carbides in martensite matrix on the fatigue life and other properties have been investigated by using the SUJ 2 kind (JIS) of bearing steel having coarse particle carbides and fine particle ones, respectively, and low chromium steels with different carb…
Paramagnetic susceptibilities have been calculated of ions with formal 2D ground terms perturbed by cubic and axial crystal-fields and spin–orbit coupling. They are critically compared with those computed from a basis set of orbitals restricted to the cubic field 2T2 ground state. Anisotropies are found to be particul…
Abstract not Available.
Abstract Several possible chemical structures for poly(α‐phenylethylisonitrile) are examined, and the structure is proposed for the polymer as it originally forms. The isolation of acetophenone from hydrolysates of the polymer suggests, although not conclusively, that the polymer may have undergone a tautomeric rearra…
Loss measurements and domain observations are presented for two types of grain-oriented 3%-silicon-iron sheet having widely differing domain sizes, in order to elucidate the origin of anomalous loss in magnetic materials. An alternative method is presented for separation of eddy current and hysteresis losses, which gi…
The magnetic susceptibilities of the transition-metal monophosphides TiP, ZrP, HfP, VP, NbP, TaP, and CrP were measured between 78° and 400°K. Susceptibilities ranged from − 0.70 × 10−6 cg/gm for TaP to 3.4 × 10−6 cg/g in CrP. Although small temperature variations of χ were observed in some cases, magnetic ordering wa…
三二酸化セリウム (Ce2O3) の材料物性は, 従来ほとんど検討されていなかった. Ce2O3は二酸化セリウム (CeO2) を水素中1400℃以上で還元して得られる. このようにして得た焼結体および粉末を用いて測定を行ない, 以下の結果を得た.(1) Ce2O3は極めて酸化しやすく, 空気中では室温でも酸化の進行が認められ, 加熱した場合は約60℃以上で急激に酸化しCeO2になった. また通常の真空中, アルゴン中, 水素中でも数100℃から1000℃の温度では, いくらか酸化して中間相 (CeO2-x) を生成した. アルカリには不溶, 酸にはゆっくり溶け, 水と反応して水和物をつくることが観察された.(2) Ce2O3の小…
The loss of moisture and the initiation of dry-band formation on wet contaminated insulation has been studied by measuring the insulation resistance of the contaminated specimen as a function of the degree of contamination, relative humidity, applied voltage and time. Drying of the wet contamination consistently occur…
Abstract On the basis of an isoviscosity criterion for the glass transition (η g ⋍ 10 13 poise) in liquids of low molecular weight, theoretical T g values were calculated for the n ‐alkane series by the equation log η = log A + B /( T − T 0 ), with the use of values reported by Lewis for the parameters. The T g / T 0…
Abstract An experimental study was made of the short range order (SRO) and temperature dependence of the stacking fault energy (SFE) for a Cu‐15 at% Al alloy using (110) single crystal foils. The SFE was determined using measurements form threefold nodes, intrinsicextrinsic fault pairs, and Frank triangles. Good quant…
Abstract The dielectric constant ε of triglycine sulfate has been measured along the ferroelectric axis in the vicinity of the transition temperature T c . The thickness dependence of the maximum ε‐values can be explained by assuming two different surface layers. The outermost layer is formed during the preparation of…
Principles of textile testing: an introduction to physical methods of testing textile fibres, yarns and fabrics , Principles of textile testing: an introduction to physical methods of testing textile fibres, yarns ... , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی