Materials Literature
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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…
Two different liquid crystalline phases and the reversible phase transition between them have been found for the spin coated thin film of tetrakis(octylthio)phthalocyanines both with and without copper (II): Phase 1 of as-prepared films changed with time lapse at room temperature into phase 2 which had a new absorptio…
The effect of alpha-difluoromethylornithine (DFMO) on 125I-induced brain injury was investigated in a dog model. Cerebrospinal putrescine levels were reduced from baseline levels 1-2 weeks after irradiation in animals treated with 125I and DFMO, while putrescine levels were elevated in 125I and saline-treated animals.…
We present measurements of the thermal behavior of the second-harmonic generation (SHG) phase-matching loci of deuterated l-arginine phosphate (dLAP) at a fundamental wavelength of 1.064 μm. These results clearly indicate the existence of temperature-insensitive phase-matching directions that possess large nonlinear c…
A number of binary systems with induced smectic and/or nematic mesophases where one or both the components are mesogenic, have been reported by us.1,2 To quantify the results, eight more binary systems of the types were studied. In the three binary systems of both non-mesogenic components, induced nematic and smectic…
A simple method for preparing cross-sectional transmission electron microscopy specimens and discussions of possible artifacts from specimen preparation and observation of x-ray multilayer thin film structures are presented. The specimen preparation method employs mechanical grinding and polishing to approximately 20…
The microstructures of the omega phase in Ti-Mo alloy single crystals were investigated using high resolution electron microscopy (HREM), image processing and dark-field methods. By image processing, the assembly of linear defects which had been reported was revealed in the region of the superposition of two kinds of…