Materials Literature
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A micromechanics study is made of the rate-dependent thermal softening behavior of a tungsten matrix composite containing glassy particles. Under adiabatic compression of the composite, the elastic glassy particles thermally soften at relatively high strains, enhancing the thermal softening of the tungsten-based compo…
X-ray diffraction experiments under coherent conditions have been made possible by the development of new sources of synchrotron radiation, but make tough demands on the experimental apparatus. Here we describe the design and initial testing of a precision aperture that uses polished molybdenum rods as the slit blades…
A small amount of glass based on 4 PbO.B2O3 system has been utilized to bring down the sintering temperature of PZT ceramics and to enhance the piezoelectric and dielectric properties. The mechanism of liquid phase sintering increases surface diffusion and accelerates the grain growth processes. The specimens sintered…
Abstract This unit describes a gene fusion expression system that uses thioredoxin, the product of the Escherichia coli trxA gene, as the fusion partner. The inherent thermal stability of thioredoxin and its susceptibility to quantitative release from the E. coli cytoplasm by osmotic shock can also be exploited as use…
Polycarbonate (PC)/polystyrene (PS) blend is an immiscible system. The use of copolymers as compatibilizers in blends of immiscible polymers is one approach which is being developed within the larger field of polymer blends and alloys. The methods for preparing PC–PS copolymers are difficult and complicated. In this p…
Rates of mass transfer at hemispherical cavities machined in the wall of a vertical rectangular duct were measured by an electrochemical technique which involved measuring the limiting current of the cathodic reduction of K3Fe(CN)6 Variables studied were solution flow rate, physical properties of the solution and cavi…
Prior experimental observations reveal that the transformation stress and strain of single-crystal shape memory alloys (SMAs) are strongly anisotropic and moderately asymmetric. Models capable of evaluating the anisotropy of transformation stress are now available for unconstrained and constrained transformation of si…
The kinetics of adsorption and desorption of carbon monoxide on Ir(111) have been investigated using the well-defined and carefully calibrated IR absorption peak position of the CO intramolecular stretching vibration as a nonintrusive coverage probe. Experiments were performed with time-resolved Fourier transform infr…
Fire resistant sheet moulding compounds based on biofibre-glass hybrid reinforcements were developed and the efficacy of the fire retardancy was determined by the measurement of the limiting oxygen index and the results were correlated with the differential scanning colorimetric data.
A hydrogenation-disproportionation-desorption-recombination process (HDDR) was applied to Sm2Fe17−xGax (x=0.5, 1, and 2). The process was studied by means of temperature-pressure analysis, x-ray diffraction and scanning electron microscopy. It was shown that Ga not only stabilizes the interstitially modified compounds…
Abstract— A reaction sintering route is developed to produce, “in situ”, composites of alumina‐aluminium titanate using alumina and titania as starting powders. Aluminium titanate, can be formed by a solid state reaction between Al 2 O 3 and TiO 2 at temperatures above the eutectoid temperature of 1280°C. These compos…
Abstract Perpendicularly-linked pentamethinestreptocyanine dimers (1) in which the two cyanine moieties are linked at the center carbon atoms of the methine chains were prepared. The absorption spectra of 1 in solution showed two peaks at 446 and 406 nm, which are attributed to the splitting of the HOMO levels through…
The chemical and magnetic structures of neodymium/praseodymium superlattices grown by molecular-beam epitaxy have been determined using x-ray and neutron-diffraction techniques. The x-ray measurements show that the superlattices have a dhcp structure of high crystalline quality, and that the stacking sequence is coher…
Novel biphotochromic systems containing two norbornadiene moieties in one molecule or one norbornadienyl group in 2-N-(3-phenylnorbornadiene-2-carbonyl)]-N-arylaminomethylene-(2H) benzo[b]thiophenones have been prepared. Under UV/VIS irradiation the latter compounds undergo Z/E-isomerktion acompanied by N → O acyl rea…
Abstract The photoisomerization of trans ‐10b,10c‐dimethyl‐10b,10c‐dihydropyrene ( 1 ), its 2,7‐di‐ tert ‐butyl derivative 5 and a series of potassium sulfonate derivatives of 1 , in both [D 8 ]1,4‐dioxane and [D 2 ]dichloromethane as solvent, has been studied using λ = 420–570 nm irradiation. Irradiation of a deoxyge…
An investigation was made of the effect of the nature of elastomer, thickness of the membrane and its formulation, and the temperature and relative humidity of the surroundings, on the permeation of bis(2-chloroethyl)sulfide (SM), a well-known chemical warfare agent, through solution-cast elastomer membranes. The perm…
The difference in heat capacity of the LI2 and hP24 phases of Co3V was measured by calorimetry at temperatures from 80 to 320 K. Inelastic neutron scattering measurements were performed on Co3V with the LI2, hP24 and fcc phases at elevated temperatures, and the neutron-energy-loss spectra were converted into phonon de…
The higher order kinoform lens is a diffractive imaging lens for which the optical path length transitions between neighboring zones is an integral multiple of the design wavelength. Convenient expressions for diffraction efficiency, Seidel aberrations, and spherical aberrations of different orders are derived. It is…
The reactions of YCl3 with the polyalcohols (HOCH2)3CCH3 and (HOCH2)3CN(CH2CH2OH)2 in MeOH yielded [Y{(HOCH2-O3CCH3}2Cl2]Cl·MeOH (1) and [Y{(HOCH2)3CN(CH2CH2OH)2}Cl2(MeOH)]Cl (2), respectively. Similarly, the reaction of Y(NO3)3 with (HOCH2)3CCH3 in ethanol gave [Y{(HOCH2)3CCH3}Cl2(NO3)2 (3). In all cases, the ligands…
Important perfumery aldehydes such as 10-undecenal could be synthesized by Rosenmund reduction. This reduction by hydrogen is usually effected in the presence of a supported Pd catalyst. The main by-product is the alcohol, and it is formed by the subsequent reduction of the aldehyde. This can be prevented by the use o…