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。
Abstract Potassium hydrogen sulphate single crystal has been γ-irradiated at room temperature and its electron spin resonance spectrum recorded by changing the H 0 static magnetic field, around an orthogonal axes system. The electron spin resonance spectrum is a single line with a slightly anisotropic g factor. The pa…
A method has been developed to measure the related rotation of the flanges of a thin-walled tubular specimen during a torsion test. The method, which is based on the Moiré-fringe technique, is capable of use at the high rates of strain encountered during a Hopkinson-bar test, as well as at low rates of strain. In the…
Abstract Lactitol, prepared by reduction of lactose, was transesterified successfully with a series of fatty methyl esters with the aid of alkaline catalysts at 90 C. This was in marked contrast to previous experiences with lactose. Lactitol laurate, palmitate, stearate, and tallowate were prepared in this manner. The…
Most recently the practical importance of high temperature vaporization reactions has appeared in the synthesis of pure materials through vapor transport reactions and in the study of the movement of materials in nuclear power reactor experiments. The most recent basic development is the establishment, at temperature,…
Describes a solid state backscattered electron detector that has been developed at Harwell for use in a scanning electron microscope. Applications of the method of detection are discussed and examples of the three principal uses are shown. These are in the display of atomic number variations, examination of crystal qu…
Various combinations of biaxial stress were applied on five batches of recrystallized zircaloy-2 fuel cladding tubes with different textures; elongation in both axial and circumferential directions of the specimen was measured continuously up to 5% plastic deformation. The anisotropic theory of plasticity proposed by…
A new empirical method of averaging the shear modulus is proposed. The elastic Debye temperatures ϑ calculated for a number of cubic elements and semiconducting compounds have been found to be in excellent agreement with the corresponding computationally exact ϑ. The computed shear modulus is also in good agreement wi…
This article discusses primary and secondary particulates with respect to their size distribution, origin, and chemical composition. Primary particulates are particles that are injected directly into the atmosphere. Usually their sizes are within the range 1 to 20 jum. Common sources are windblown soil, industrial emi…
For various technological applications patterns are chemically etched in metal films partly covered with a nobler metal. As a result of the bimetallic contact, accelerated etching may occur, giving rise to considerable undercutting. From electrochemical considerations it was expected that the use of certain chemical p…
DEFORMATION MODES OF UNIDIRECTIONALLY SOLIDIFIED CARBIDE-REINFORCED COMPOSITES: IN SITU EXPERIMENTS IN THE HVEM RELATED TO MACROSCOPIC BEHAVIOUR In situ investigation of the plastic deformation in tension was performed in the high voltage electron microscope on a unidirectionally solidified metal matrix carbide-reinfo…
In this paper, the phenomenological effects of d→f and f→f processes are examined. The relationship between radiationless multiphonon decay and excitation processes is obtained in terms of the first-order adiabatic relaxation theory. A detailed analysis is given of the experimentally observed temperature dependence of…
For linear transfer conditions and objects with isotropic statistics, both the sharpness of the point spread function and its departure from rotational symmetry show up in the shape of the autocorrelation peak of the electron micrograph. It is therefore suggested that this function be used for interactive or automatic…
Abstract From 60 to 90% of the calcium exchange capacity (pH 7 Ca acetate saturation, Mg acetate replacement) was attributable to > 2µm particles in subsoil horizons of an Ultic Hapludalf developed in residuum from chloritic metabasalt in Maryland's Middletown Valley. Vermiculite was the dominant reactive mineral i…
The devitrification behavior of specimens with compositions 2CaO · (1‐ x )MgO · x Al 2 O 3 · (2‐ x )SiO 2 , 0≤ x ≤1, was studied. The crystallizing phases were identified by X‐ray diffraction, and the transformation temperatures were determined by differential thermal and/or thermodilatometric analysis. The microhomog…
Abstract The influence of material flow properties on the variation of wall thickness in a thermoformed part was investigated by measuring the thickness reduction at the pole of free‐formed axisymmetric domes of poly(methyl methacrylate) and high‐impact polystyrene. It was found that at a given pole height, the thickn…
Corrosion rates of iron in 6N HCl measured by the polarization technique show a sharp decrease at a homopiperazine concentration of 0.016M. Below this concentration, corrosion rates decrease slowly from 2200 μA/cm2 for uninhibited iron to 1400 μA/cm2 at a homopiperazine concentration of 0.016M. At slightly greater inh…
The feasibility of using atomic absorption spectrometry (AAS) to monitor aluminum and gallium atoms in a molecular beam of a system designed for growing epitaxial layers of GaAs and AlxGa1−xAs was investigated. Results are reported to demonstrate the effectiveness of the method for monitoring the flux emitted from sou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleThe Structure of Regenerated CelluloseF. J. Kolpak and J. BlackwellCite this: Macromolecules 1975, 8, 4, 563–564Publication Date (Print):July 1, 1975Publication History Published online1 May 2002Published inissue 1 July 1975https://pubs.acs.org/doi/10.1021/ma60046a037https://doi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual magnetic properties of binuclear copper(II) complexes with both hexafluoroacetylacetone and N-substituted salicylaldimine in crystalsHiroshi Yokoi and Makoto ChikiraCite this: J. Am. Chem. Soc. 1975, 97, 14, 3975–3978Publication Date (Print):July 1, 1975Publication H…
The densification behavior of pressure sintered cubic silicon carbide containing 1 wt% boron carbide was studied as a function of temperature (1750° to 1950°C). Specimens of theoretical density were obtained at 1950° with a pressure of 3000 psi. Experimental results showed that densification proceeded by a plastic flo…