Materials Literature
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We have applied the Judd–Ofelt theory of f–f transition rates to the absorption and fluorescence of americium in a fluorozirconate glass. The intensity parameters calculated from infrared absorption transitions are inconsistent with the absorption and emission rates observed for the 5L6′ state at 19 960 cm−1, but are…
DTA and dielectric measurements for differently ordered and quenched PbIn0.5Nb0.5O3 crystals are presented. Two phase transitions were found in partially ordered PIN, related to antiferroelectric-paraelectric and ferroelectric-paraelectric phase transitions in the ordered and disordered regions respectively.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrected densities and revised coefficients for diffusion of various dialkyl phthalate plasticizers in PVCRobson F. Storey, Kenneth A. Mauritz, and Martin L. CarterCite this: Macromolecules 1991, 24, 25, 6784–6785Publication Date (Print):December 1, 1991Publication History…
We present the hydrodynamic and electrohydrodynamic equations for the liquid crystalline smectic CM phase. This phase, which is fluid in the layers, orthogonal and optically biaxial, has recently been found experimentally in polymeric liquid crystals. We compare the macroscopic properties of the CM phase with those of…
Abstract : This study investigated tools and techniques for performing finite element analysis of the MBU-20/P pilot's oxygen mask. The problem which was investigated was the fit of the mask to the face at Positive Pressure Breathing (PPB) pressures. Deformed geometry of the mask and reaction forces on the face were c…
Characteristics of Brown Forest soils developed under different bio-climatic conditions from low to high eleyations in the Kinki District were studied with special reference to their pedogenetic processes. The Brown Forest soils at high elevations were characterized by a lower bulk density, higher capacities to adsorb…
Abstract Small‐angle neutron scattering (SANS) has been used to investigate macromolecular orientation of uniaxially hot‐stretched partially deuterated polystyrene. Principle radii of gyration and degree of eccentricity were measured over a range of hot‐stretch temperatures, strain rates, and external draw ratios (EDR…
Abstract The Upper Cretaceous (Maastrichtian) Whitemud Formation is a potentially commercial kaolin deposit located in southern Saskatchewan and southeastern Alberta. The Whitemud Formation contains a lower kaolinitic sandstone, a middle lignite and carbonaceous shale, and an upper interbedded siltstone and claystone.…
Abstract Novel regular network polyester films were prepared from pyromellitic (X), biphenyltetracarboxylic (U), and 3,3′,4,4′‐benzophenonetetracarboxylic (W) dianhydrides and ethylene glycol (2G). Prepolymers prepared by melt polycondensation were cast from DMF solution and successively post‐polymerized at 260°C for…
The effect of hydrostatic pressure on the optical-absorption edge of type-IIa diamond has been measured at room temperature to 2.3 GPa using a sapphire anvil cell. The absorption edge shifts toward higher energy at a rate of 6.0 meV/GPa, in fair agreement with the first-principles calculations of Fahy et al. [Phys. Re…
TGS crystals including D-serine admixture at different concentrations were grown and their dielectric properties as well as crystal structure were investigated by applying the Bragg - Brentano method. D-serine admixture was found to cause nonsymmetric growth of crystals along the ferroelectric axis as well as to induc…
Abstract Chemical compositions of goldfieldite-tetrahedrite series minerals from the Iriki mine in Japan are reported for the frst time. The compositional variations of coexisting goldfieldite [atomic proportion Te > (Sb + As + Bi)], tellurian tetrahedrite [Sb > (Te + As + Bi)], and Te-free tetrahedrite from thi…
The optical constants (the refractive index n, the absorption index k and the absorption coefficient ) of Bi2 Te3 thin films were determined in the wavelenght range of 2.5 to 10 m. The shape of the absorption edge in Bi2Te3 thin films has been determined from transmittance and reflectance measurements. The edge is of…
Cellobiono-1,5-lactone (CBL) induces cellulase, particularly cellobiohydrolase I (CBH I) formation in Trichoderma reesei. When used as a sole source of carbon, it promoted comparably poor growth, because (a) the δ-gluconolactone arising by the action of β-glucosidase is not metabolized by the fungus, and (b) it is a l…
A generalization of the Landau--de Gennes phenomenological theory of smectic-A liquid crystals is described. The theory is based on a Landau-Ginzburg free energy that includes local and nonlocal parts. The local part consists of the isotropic-Ising-model free energy and de Gennes's phenomenological free energy of the…
Neutron effects on the mechanical properties and the microstructures of borated stainless steel are studied by irradiating three borated stainless steel batches to different radiation levels (from 1 × 1013 to 1 × 1017 n/cm2). Each batch includes samples varying in boron content from 0.25 to 2.01 wt° and manufactured b…
As part of the International Program on Acidification Effects on Materials, of the United Nations Economic Commission for Europe, this work presents results from the evaluation of nickel and copper in the electric contact materials group after 1 and 2 yr of exposure. The evaluation is based on weight‐increase measurem…
To confirm the value of the theoretical analyses presented in Part I, a number of specially woven fabrics have been tested. The agreement between experiment and theory is sometimes reasonable, but it is better during extension than during recovery. The reasons for such discrepancies are discussed. The outcome of this…
A wide range of nonlinear optical coefficients and various systems of notation have been used to describe optical second-harmonic generation (SHG). To avoid possible confusion, the techniques of optical nonlinear coefficient measurement and the elementary theory of SHG are briefly reviewed. Absolute and relative nonli…
Data of the cone angles found with 80 different polymers tested as alignment layers for surface stabilized ferroelectric liquid crystal displays are given. The structural properties of the polymers are correlated with their ability to give good, bistable alignment in such liquid crystal displays. The symmetry of the m…