Materials Literature
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A simple method is proposed for studying the spectral response of a first-order waveguide grating filter with random fluctuations in the period of the grating. The method can be applied to any grating groove shape, and it can be used to study the effect of both random and systematic variations in other grating filter…
When isotactic polypropylene material was uniaxially cold-drawn and then annealed with free ends, folded-chain lamellar crystals formed almost perpendicular to the c-axis, i.e., to the draw direction. When stress is applied in the draw direction, the forces are primarily transmitted by the taut tie molecules connectin…
Composites made from powder-liquid constituents and subjected to elevated temperatures during storage are more stable than those employing pastes. The decomposition of the benzoyl peroxide ingredient is mainly responsible for the increased setting time and the decreased mechanical properties of the resulting composite.
The luminescence and transport properties of high-quality undoped and phosphorus-doped Zn1-xMgxTe alloys (x ≤ 0.50) have been investigated. At 4.2 and 300 K, the photoluminescence of unintentionally doped crystals is dominated by near-band-edge recombination mechanisms. In phosphorus-doped samples, the luminescence sp…
The pressure (0–10 kbar) and temperature (10–130°C) dependence of the dielectric properties of squaric acid (H 2 C 4 O 4 ) were investigated. From the large isotope effect on the transition temperature of T n d / T n =1.38 (the superscript d stands for deuteration) and the large decrease of T n with pressure of d T n…
K 2 Au 2 l 6 crystallizes in the monoclinic space group P2 1 /n. It is built up by linear anions AUI 2 -, square-planar anions AUI 4 -, and K + cations. The coordination of the gold(I) and gold(III) atoms is completed by additional iodine atoms at larger distances to form compressed and elongated octahedra, respective…
Abstract The γ‐radiation‐induced crosslinking of polystyrene was studied at 30–100°C in vacuo with a dose rate of 6.35 × 10 5 rad/hr. The amount of hydrogen formation increased with increasing irradiation time, and the rate of the formation decreased with the time. The results were well described by the zero‐order for…
Abstract not Available.
Abstract Influence of hydrofuramide and ethanolamines on efficient vulcanization (EV), semi‐EV, and conventional sulfur vulcanization accelerated by tetramethyl thiuram disulfide is reported. In the case of thiuram vulcanization, the amines increase the cure rate but reduce the crosslink density. The interaction of te…
Abstract The crystallization characteristics of the binary system polyoxyethylene (PEO)‐glutaric acid were determined. From the extrapolated melting point depression data the heat of fusion for PEO is 2506 ± 200 cal/mole of repeat unit while the heat of solution for the glutaric acid amounts to 6.7 ± 1.2 cal/cm 3 . A…
Abstract Metalloporphyrins perform a variety of functions in nature from the storage and transport of electrons and molecular oxygen to the decomposition of hydrogen peroxide and the activation of oxygen. The chemistry of both the centrally coordinated metal and the porphyrin macrocycle play important roles in these r…
The electrochemical “polarization resistance” method (also known as “linear polarization” method) was used in conjunction with a rotating iron electrode to investigate the effect of velocity and dissolved oxygen on the initial corrosion behavior of iron in high purity water. In low concentration, dissolved oxygen is c…
The carrier mobilities of PS were studied using a short-pulsed electron-beam. Even in the polymer with a π-electron system, no clear knee was observed in the induced charge signals at low applied fields. A logarithmic plot of the induced current versus time gives a knee at time T r , which is thought to be the transit…
The Voigt function fit to the experimental powder diffraction profiles of Ni, measured with neutrons and X-rays, is studied. In the neutron case the instrumental factors are dominant while the X-ray profiles are determined by the size and strains of the crystallites. The neutron diffraction profiles fit very well down…
The threshold voltage for zinc displacement in ZnO by electron irradiation lias been determined by high–voltage electron microscopy as a function of incident orientation from the [2110] to both the [0001] and [000T] directions. It is found that the threshold voltage is a minimum (∼700kV) in the [2110] direction and a…
A simple sequential scheme is developed for the efficient removal and classification of dyes from 1–cm to 2–cm lengths of nylon, polyacrylonitrile and polyester fibres.
During a series of experiments aimed at developing a better understanding of the basic mechanisms of electrical treeing in polymer insulations, the dependence nce of the dc conductivity of polyethyle ( with and without additives) on temperature and field strength was examined. It was discovered that all additives, and…
The dynamic mechanical and dielectric relaxations of plasticized and un-plasticized cellulose acetate, cellulose acetate propionate, and cellulose acetate butyrate were characterized. Three relaxations common to all compositions were found (α, β, and γ), while a fourth (5) was observed only in cellulose acetate butyra…
Two isozymes of NADP+-specific isocitrate dehydrogenase [ICDH; EC 1.1.1.42] were confirmed to be present in an obligately psychrophilic marine bacterium, Vibrio sp., strain ABE-1, on the basis of the temperature-activity curve and electrophoretic mobilities. These isozymes were separated and purified about 170-fold fo…
We present a theoretical study of the propagation of magnetoelastic waves in a ferromagnetic film bonded to a nonmagnetic substrate. We find magnetoelastic waves which correspond to both Rayleigh waves and Love waves modified by the magnetoelastic interaction. Deviations from the elastic-wave characteristics are found…