Materials Literature
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Optical absorption and emission measurements are reported for the Cs2NaSmCl6 and Cs2NaYCl6:Sm3+ (1 or 30 mol %) systems under variable-temperature (10–298 K) conditions. Twenty-six crystal-field levels spanning 13 multiplets of the Sm3+ 4f 5 electronic configuration are located and assigned on the basis of the experim…
Indium tin oxide films have been grown by rf sputtering at various Ar-O2 mixtures, at low substrate temperatures (200 °C), and deposition rates (25 Å/min), followed by post deposition annealing (at 350 °C) in different ambients (O2, N2, and cracked ammonia). Influence of a reactive gas (oxygen) on the sputtering rate…
We examine the two- and three-point matrix probability functions for a two-phase random and homogeneous system of impenetrable spheres. For such a system, we give an exact analytical expression for the two-point matrix function S2 through second order in the number density of particles. Moreover, the two-point matrix…
Low-temperature magnetic susceptibilities yield an effective magnetic moment per W atom of (3.24\ifmmode\pm\else\textpm\fi{}0.10)${\ensuremath{\mu}}_{B}$ for both ${\mathrm{W}}_{0.05}$${\mathrm{V}}_{0.95}$${\mathrm{O}}_{2}$ and ${\mathrm{W}}_{0.08}$${\mathrm{V}}_{0.92}$${\mathrm{O}}_{2}$. This value suggests a transfe…
This paper points out a number of errors that have appeared in the literature concerning transmission-line models for metal grid reflectors (strip gratings and meshes) especially in regard to the design of laser mirrors and filter elements for use at submillimeter wavelengths. General formulas are given for the transm…
A flight experiment was performed on the eighth Space Shuttle mission to measure reaction of surfaces with atomic oxygen in the low earth orbital environment. More than 300 individual samples were exposed to ram (normal to surface) conditions for 41.75 hr leading to a total atomic oxygen fluence of 3.5 x 10 to the 20t…
Ion beam sputter-deposited thin films of Al2O3, SiO2, and a codeposited mixture of predominantly SiO2 with small amounts of a fluoropolymer were evaluated both in laboratory plasma ashing tests and in space on board shuttle flight STS-8 for effectiveness in preventing oxidation of polyimide Kapton. Measurements of mas…
We demonstrate that the equations of hydrodynamics for a simple compressible fluid, including nonlinearities and thermal fluctuations, display a transition, at sufficiently high densities and low temperatures, to a glass. The theory leads to predictions for the behavior of viscosities, sound speeds, and correlation fu…
Hopping of photoexcited carriers directly between localized, band-tail states gives rise to a new regime of energy relaxation which is manifested at low temperatures: For times shorter than a characteristic "segregation time," carriers hop directly to lower-energy states; at longer times, thermal excitation---resultin…
The lattice distortions of NbTe 4 and TaTe 4 are investigated by electron microscopy and electron diffraction. Evidence is presented for a high-symmetry distortion, with a space group of P4/mcc for sublattices and commensurate superlattices in both materials. Satellite dark-field images show discommensuration arrays w…
The role of initiator and activator concentrations on the whole process of ε -caprolactam anionic polymerization has been explored, with the aim of selecting the most suitable experimental conditions for the RIM process. The effects of the active species on high polymer yield, residual monomer content, higher oligomer…
The successful utilization of Reaction Injection Molding (RIM) to fabricate complex polyurethane shapes in a single step from relatively low viscosity streams has led to a search for other chemical systems which can be fabricated by the RIM process. The rapid polymerization of molten caprolactam by anionic catalysis h…
Optical second-harmonic generation has been applied to the study of clean Si(111) 2\ifmmode\times\else\texttimes\fi{}1 and 7\ifmmode\times\else\texttimes\fi{}7 surfaces. By an analysis of polarization dependences of the two reconstructions, the symmetry properties of the surfaces have been determined. The 2\ifmmode\ti…
A comparison of infrared spectra from individual teeth along the radula of a chiton (Polyplacophora, Mollusca) shows that the first-formed calcium phosphate mineral is amorphous. Over a period of weeks the mineral transforms to dahllite. The c axes of the dahllite crystals are aligned approximately perpendicular to th…
Analogous to mechanical strength, electric strength in insulation systems is a particularly important property. If the electric stress exceeds the electric strength, the insulation either partially or completely loses its insulating capacity. Such a loss can be transient or permanent in nature, correspondingly one dif…
窒素ガス流通下 (150-200ml/min), 500°-1100℃の温度範囲でMg還元によってZrO2からのZrN粉末の合成を試みた. ZrNは600℃以上で生成し, 試料混合比Mg/ZrO2=2-4 (モル比) において中間生成物γ-Zr2ON2が生成したが, Mg/ZrO2=5 (モル比) ではγ-Zr2ON2は生成しなかった. Mg/ZrO2=5 (モル比), 600°-1100℃, 1h反応で得られた生成物を1N HNO3及びアルコールで洗浄し, 真空乾燥 (10-3Torr) させた精製粉末は, X線回折試験によればZrN単相であった. このZrN粉末の結晶子径及び比表面積は, 1000℃以下でほぼ一定で, 結晶子径…
Preparation de poudre ultrafine de nitrure de zirconium par nitruration de ZrO 2 en presence de Mg dans un courant d'azote a 1000°C pendant une heure. Etude microstructurale de la poudre
The purpose of this study is to research into the thermal condition and the weight of clothes suitable for the officers engagged in light works in an air-conditioned room in summer. The Major findings are as follows: 1. Thermal conditions of the working environment are (Dry bulb temp.), (Relative humidity) and 2.6m/se…
リチウム金属の表面を窒化することによりLi3N膜の作製を試みた. 生成反応過程の観察を行い, 生成反応に対する雰囲気の影響について調べた. 更に生成した膜のリチウム固体電池への利用について検討した. 膜厚を制御するための反応は室温で行い, 反応時間90分で約1mmの膜厚を得た. 膜の生成速度は, 反応に用いた窒素ガスの純度が高くなるに従って遅くなることが分った. TiS2を正極とした電流では1μA程度の電流を約1時間取り出した. しかし一般的に電池の内部抵抗が高く, また長時間にわたる放電はできなかった. 比較のために窒化リチウムの圧粉体及び焼結体についても導電度の測定を行い, 窒化リチウムの化学的及び電気化学的な安定性を検討した.
Binding of aspartate and glutamate residues with the lanthanide cation Yb3+ has been studied in D2O, involving two kinds of peptide backbones: N-acetylamino acid methyl esters and cyclic dipeptides. A method is described for the quantitative analysis of the lanthanide-induced shifts (LIS) from which the best model of…