Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The far infrared reflectivity of KTa${\mathrm{O}}_{3}$ has been studied as a function of temperature from 12 to 463\ifmmode^\circ\else\textdegree\fi{}K. The results have been analyzed by means of a Kramers-Kronig method, and indicate a "soft" mode, lowering its frequency as the temperature is lowered towards the "Curi…
The lattice parameters of KN${\mathrm{O}}_{3}$ were measured in the temperature region of the ferroelectric transition. The changes in the lattice parameters as the crystal undergoes the paraelectric-to-ferroelectric transition have been interpreted as being due to the electrostriction effect. The dielectric constants…
An approximate dispersion curve for the optical branch of the lattice vibration is used to estimate the spin-lattice relaxation time attributed to optical phonons. The relaxation rate is found to be ${{T}_{1}}^{\ensuremath{-}1}\ensuremath{\propto}\mathrm{exp}(\ensuremath{-}\frac{\ensuremath{\hbar}{\ensuremath{\omega}}…
The atom-beam recoil technique has been used to measure absolute total cross sections for the scattering of electrons by atomic and molecular oxygen at 22 energies between 0.5 and 11.3 eV, with additional data obtained up to 100 eV. In this method, a modulated electron beam cross-fires an atom beam, whose attenuation…
The performance characteristics of nonwoven fabrics have been studied as a function of fiber properties, binder properties, and web construction. The particular type of non-woven selected for study was a web of random-laid base fibers in which randomly placed thermoplastic fibers provide the bonds. The responses studi…
Abstract Transmission and diffraction electron micrographs were made of illite and montmorillonite to study the changes that take place as the clays were heated continuously to 1200°C. In both of the clay minerals studied, expulsion of a highly fluid material occurred subsequent to dehydroxylation and prior to the dev…
The self-diffusion coefficient of the lithium ion in cubic lithium sulphate has been measured from 640 to 790°C. From electrical conductivity and electromigration experiments it has been found that several cations are moving in phase and the mean value of the number of ions in each group has been estimated to be about…
"A Modified Formula for Differential Exposure Albedo for Gamma Rays Reflected from Concrete*." Nuclear Science and Engineering, 27(2), pp. 481–482
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation J. R. Barrett, G. C. Gerhard; Negative Photoconductivity in Gold‐Doped Silicon. Journal of Applie…
The properties of the fcc to hcp transformation in cobalt single-crystal whiskers have been determined. Studies of the crystallographic properties and dislocation structure using optical, standard x-ray diffraction, and high-resolution x-ray diffraction topographic techniques are herein reported. It is shown that the…
The mean-square atomic displacements (u~,) and (u~ z ) are calculated in the range 0-600K from thermodynamic and inelastic neutron-scattering data. Thermodynamic data alone give (2u~ + z u~), which is separated into its components 2(u~) and (u~) with the aid of the lattice-dynamical model of DeWames, Wolfram & Lehman…
The elastic modulus and internal friction of stoichiometric uranium oxide at room temperature were studied using a dynamic method. The elastic modulus of stoichiometric urania at room temperature increases with increasing density. When the volume fraction porosity is less than 0.1, either linear or exponential equatio…
Abstract The thermal decomposition of trioxalato complexes of cobalt(III), iron(III) and chromium-(III) has been investigated by the thermogravimetric, the polarographic and the infrared spectroscopic method. The results indicate that, in the case of the iron(III) and the cobalt(III) complexes, the decomposition react…
The glide of jogged dislocations is considered. Rate equations are presented to describe the motion of dislocations containing interstitial-producing jogs in both the low-stress, quasi-equilibrium regime of behavior and the high-stress, thermally activated regime. The concept of point forces acting at pinning points i…
The resonant frequency of a bubble attached to a rigid infinite plane in an infinite incompressible liquid was determined theoretically taking into consideration the angle of contact of the bubble with the plane. The resonant sizes at 33 and 36 kHz were determined experimentally by plotting the relative acoustic press…
Abstract The behavior of rigid circular cylinders suspended vertically in viscous fluids in laminar shear flow was found to compare favorably with a theory for infinitely long cylinders which we have extended to include interactions between two cylinders of different diameters. A description of the versatile Couette a…
Gaseous diffusion in polymeric foam and experimental results, using closed cell polyurethane foam
Three properties of any recorder are of primary importance in electron microscopy: (1) its spread function, (2) its signal-to-noise characteristics (or, detective quantum efficiency, DQE), and (3) its sensitometric curve shape. Photographic materials are found to have spread functions that are not limiting under norma…
In order to know the role of ionizable groups in the stability of the lysozyme [EG 3.2.1.17] molecule, the effect of pH on the optical rotatory and ultraviolet spectral properties was investigated. The optical rotatory properties of lysozyme did not change at pH's between 8 and 1. However, the acid-vs-neutral differen…
Simultaneous diffraction of X-ray is theoretically studied for four cases in which the relevant reciprocal points form an isosceles triangle, an equilateral triangle, a square, or a regular hexagon. Explicit expressions are derived for the X-ray wave-field in the crystal when all sets of the diffracting planes concern…