Materials Literature
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Abstract The crosslinking reactions of a new type of polyethylene, an ethylene vinyltrimethoxy silane (EVS) copolymer, when reacted with water has been studied. Samples of EVS were treated in water at 90°C. The kinetics of the crosslinking was followed by measuring the gel content and by determination of the content o…
The current-voltage characteristics of Schottky diodes fabricated using as-grown diamond films depend on the electronegativities of metals. However for diamond films oxidized by boiling in a saturated solution of CrO in H2SO4 or by exposure to an oxygen plasma, this dependence vanishes. This is because of the adsorpti…
Grazing incidence x-ray diffraction has been used to characterize the near surface structure of an aromatic polyimide film. It is shown that within the first 90 \AA{} from the surface the ordering of the polymer molecules is markedly enhanced. As the penetration depth of the x rays decreases, reflections characteristi…
Elastic neutron diffraction of Li 2 S, measured as a function of temperature, shows the onset of a diffuse phase transition near 900 K to a highly conducting state. Inelastic neutron scattering has been used to investigate the harmonic lattice dynamics of Li 2 S at 15 K. A shell model has been successfully fitted to t…
We develop a general model for flow suspended particles in a porous medium. The model can take into account the effects of the morphology of the porous medium (including pore surface roughness and fractality), the chemistry of the flowing fluid, and all important forces between the particles and the pore surface. If s…
Abstract Extensive investigations of partial discharge (pd) pulse winding response characteristics have revealed considerable physical insight into the mechanics of pulse transfer from within the windings to the externally accessable points of measurement. Based on the IEC charge measuring method, pd‐pulse response pr…
Abstract not Available.
Technology for the world's first production of 6.5% Si steel sheets in a coil form has been commercially developed. The dc and ac magnetostriction in 6.5% Si steel sheets and the noise in transformers employing such sheets were investigated, comparing the results with figures for conventional 3% Si steel sheets. 6.5%…
Insulating varnishes are widely used for coating of armatures/coils of electric motors, transformers and also for finishing electrical components. Natural resin shellac finds considerable use in the manufacture of insulating varnishes. Improved dielectric properties have been obtained for varnishes prepared from shell…
The method of the discrimination of the type and silhouette of ladies' garments was studied. Material samples of ladies' garments which had been judged good in appearance and comfort were collected. They were classified first into nine groups according to type and second each group was divided into two groups by silho…
A flow sheet for simplified reprocessing of long cooled light water reactor (LWR) fuel is presented. The standard Purex process is modified so that after the first solvent extraction cascade (co-decontamination), plutonium is washed out of the organic phase without reduction. This step also washes out enough uranium t…
Although fabric properties can be related to seam pucker, the aesthetic judgement is still left to subjective assessment which is based on ranking the stitched fabric samples by judges having compared them with photographic standards. The development of a new measuring procedure which is based on computer vision is re…
Hot-pressing powdered magnesium fluoride, under the conditions of an air, a temperature varying within the range from 510 to 690°C, a pressure of 40,000 psi, and a holding time under pressure of 30 minutes, resulted in a polycrystalline plate or shape with high in-line optical transmittance. The effect of grain growth…
The change of molecular mobility during the phase transition of PHB/3-C1-PHB copolymer (5:1) from the orthorhombic modification II into an orthorhombic modification which is close to hexagonal chain packing was investigated by means of 2H-NMR. It is shown that a flipping of the benzene rings takes place at temperature…
The thermal behavior and structure of poly(hexamethylene p,p′-biben-zoate) (BB-6)/poly(tetramethyleneoxide) (PTMO) block copolymers (BB-6/PTMO) were studied using differential scanning calorimetry, polarizing optical microscopy, and wide-angle and small-angle x-ray diffractometry. As the PTMO fraction increases, BB-6…
Abstract A comparison between the results of ab initio structure determination from X-ray powder diffraction data of a new cadmium hydroxide nitrate, Cd 5 (OH) 8 (NO 3 ) 2 ·2H 2 O ( SG C2/m), and those obtained from single crystal data is presented. The powder diffraction pattern has been analysed by an indexing metho…
A magnesium aluminosilicate glass‐ceramic (Corning Code 9606) has been heat‐treated at 900°, 1010°, 1200°, and 1260°C for up to 90 min., and the effect on the thermal conductivity between 30 and 300 K has been studied. It has been shown that the large increase of the thermal conductivity which results from the cerammi…
Abstract This paper describes analytical and experimental work which has been carried out to identify optimum process conditions for rotomolded products. The mechanical performance of the moldings has been assessed using tensile impact tests. It has been found that changes in the oven temperature or oven time cause a…
Z‐förmig und planar ist das Kation (Bild rechts) der Verbindungen Br MF (M = As, Sb), die bei der Reaktion von Br 2 mit XeF ⊕ MF entstehen. Dies entspricht einer AX 2 E 3 ‐Koordination, wie sie das Elektronenpaarabstoßungsmodell für Pentahalogen(+ 1)‐Ionen vorhersagt. Durch interionische Kontakte zwischen vier Fluorat…
A novel use of high-temperature superconductors for detecting defects in ferromagnetic and nonferromagnetic materials is reported. The magnetometer uses the even harmonics generated in a sample of YBaCuO when it is driven by an audio-frequency magnetic field. These harmonics arise from the nonlinear modulation of the…