Materials Literature
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Interatomic potentials consisting of two-body and three-body covalent forces are proposed for ${\mathrm{GeSe}}_{2}$. Using these in molecular-dynamics simulations, the nature of intermediate-range order is investigated. All the features in S(q), including the first sharp diffraction peak (FSDP), are in agreement with…
We have used time-resolved digital imaging of uniform, charged polystyrene spheres in colloidal suspension confined between smooth glass plates to study in detail the nature of particle motions in equilibrated two-dimensional dense fluid, hexatic, and crystalline phases. We observe dynamic ordered regions in the fluid…
For pt.I see ibid., vol.1, p.2341 (1989). The electrical resistivity and the Hall effect of inter-metallic compounds XMnSb (X=Pt, Ni, Au) and PtMnSn were investigated in the temperature region 4-1000 K. The results for the anomalous Hall effect were analysed in terms of skew scattering and side-jump contributions. Thi…
The authors present investigations of the crystal structure the microstructure and the magnetic properties of the inter-metallic compounds XMnSb (X=Pt, Ni, Co, Au, Cu) and PtMnSn. It was found that several of these materials contain precipitates of other phases and/or large atomic disorder, which can be influenced by…
We report results of degenerate four-wave mixing measurements of nonresonant nonlinearities in a variety of high-index lead and bismuth containing oxide glasses and the chalcogenide As2S3. The third-order nonlinear susceptibilities of the oxide glasses are found to scale with the heavy metal content. A lead-bismuth-ga…
The substitution of Mg into cement clinker phases has been studied by isothermal annealing, followed by X-ray diffraction, electron microscopy and analysis and infrared spectroscopy of the products. The substitution of Mg into 12CaO.7Al 2 O 3 is slight, and is not enhanced by concomitant substitution of fluorine. Howe…
A hot extrusion method was utilized to develop Nd-Fe-B permanent magnets suitable for radial or circumferential applications, such as in stepping motors. Billets produced by hot-pressing rapidly quenched powder were subjected to extrusion. A plane-anisotro-pic magnet was obtained by forward extrusion, and a radially a…
Experiments have been carried out to study the influence of hydrogen on the mechanical properties of a stable 304 stainless steel by using a procedure for hydrogen charging which did not cause the irreversible damage of the steel which invariably accompanies electrolytic charging. The effect of hydrogen on the mechani…
The sequence of precipitation and its kinetics in 17–4 PH (precipitation hardening) stainless steel were studied by observing the electrical resistivity and microstructure of the alloy during isothermal aging at various temperatures in the range 320–600°C. By the absence of an incubation period for the onset of precip…
Abstract A study on cotton fibers swollen slack at ambient temperature in different concentrations of LiOH and KOH indicates that fibers swollen in KOH have higher disorder. Conversion to cellulose II results from swelling in both the reagents, although, with KOH swelling, it begins at a lower concentration. Further,…
Abstract The cycloparaffins (CH 2 ) 36 and (CH 2 ) 60 were crystallized epitaxially from solutions on the (001) face of the NaCl crystal at various temperatures. Two types of crystals, so‐called edge‐on and flat‐on crystals, were separately obtained depending on crystallization temperature. The temperature for obtaini…
The authors provide step-by-step procedures for determining the appropriate surge arrester characteristics and insulation levels for both transmission and back-to-back HVDC (high-voltage direct current) systems. Information is included on insulation coordination practices in existing HVDC systems, such as typical syst…
TlNO 3 is a ferroelastic crystal belonging to the orthorhombic Aizu species m 3 mFmmm ( ss ) at room temperature. Lattice-parameter measurements by X-ray powder diffraction at various temperatures are reported for this crystal. Spontaneous-strain components are calculated from the lattice parameters. The spontaneous s…
Modifications to the computational scheme of the existing slab geometry gamma-ray transport code ASFIT are introduced to facilitate the inclusion of coherent scattering contributions. The revised code is tested with two model problems and subsequently is used to investigate quantitatively the transport effects of cohe…
Abstract A study was carried out of the development of orientation during processing of conventional blow molded bottles made from low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and high density polyethylene (HDPE). The level of molecular orientation was found to be relatively low in all of…
High-temperature crystal structures of BaBiO 3- x ( x =0∼0.2) were studied by in-situ neutron and X-ray powder diffraction techniques using controlled oxygen pressures. Rietveld profile analysis of the neutron data from BaBiO 3 at 900 K has revealed that the structure is cubic with large anisotropic thermal vibration…
The scanning reference electrode technique is a recent development which enables in situ studies to be made of many forms of localised corrosion. This technique has been utilised in the design and evolution of an apparatus which can detect and monitor small potential variations associated with active pitting in FV 448…
Abstract The corrosion behavior of stainless steel (405) specimen in 5 M H2SO4 solution has been investigated potentiostatically at four temperatures in the range 303–323 K. The inhibiting effects of ethanethiol (EtSH), dimethyl sulfide (Me2S), and dimethyl disulfide (Me2S2) have thereafter been tested for four inhibi…
Hot-line diagnosis is needed to avoid breakdowns of XLPE (cross-linked polyethylene) cables due to water trees. The authors superposed a low DC voltage on an AC commercial voltage, measured the DC component of the current which passed through the insulation, and discovered that the DC component had a close relationshi…
Abstract Studies were performed to determine the toughness characteristics of composites prepared from modified addition‐type polyimides, using Celion 6000 graphite fiber as the reinforcement. The polyimides were prepared from aromatic diamines containing flexibilizing ether connecting groups. The composite flexural a…