Materials Literature
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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…
Abstract Aromatic poly( o ‐hydroxy amide)s having inherent viscosities of 0.6–2.2 dL/g were readily synthesized by the low‐temperature solution polycondensation of N , N ′, O ‐tris(trimethylsilyl)‐substituted 2,4‐diaminophenol with aromatic dicarboxylic acid chlorides in various organic solvents. The viscosity values…
Poled polymer thin films are studied by SHG, THG, and ATR experiments. The ATR method is used for determining the linear and quadratic electro-optic (chi) (2) (-(omega) ; 0, (omega) ) and (chi) (3) (-(omega) ; 0, 0, (omega) ) coefficients. The part due to the piezoelectricity and electrostriction is characterized and…
Abstract Surface‐enhanced Raman scattering (SERS) from citrate‐coated colloidal particles suspended in organic solvents is used to study surface reactions in an organic phase. Stable colloids which gave good SERS were produced from ethanol and acetonitrile. SERS was easily discriminated from the bulk solvent Raman sca…
The potassium niobyl cyclotetrasilicate K2(NbO)2Si4O12 crystallizes in the non-centrosymmetrical polar space group P4bm with a = 8.7404(8) Å, c = 8.136(1) Å, Z = 2. The acentric character of the structure is mainly due to a sequence of short (niobyl) and long Nb-O bonds along the 4-fold axes. Optical studies on small…
Single crystals of K(Ta1-xNbx)O3 with compositions 0.30<x<1 are grown from solutions with an excess of K2O. In order to minimize striations due to temperature fluctuations a method is applied similar to that known for the crystallization in aqueous solutions. With optimized growth conditions this kind of striations is…
Data The Synthesis, Reactivity, Structure, And Physicochemical Properties Of Vinyl Tellurides, Which Are Potential Monomers, Synthons, And Intermediates, Are Given In The Present Review.
Abstract The influence of deacetylation degree on heterogeneous molecular aggregation has been investigated for chitosan solution in 2 wt % acetic acid aqueous solution using rheological and small‐angle x‐ray scattering (SAXS) methods. Three samples of chitosan, which were designated CS62, CS79, and CS96, were used, a…
Abstract Different grades of PVC resins and a variety of plasticizers are used to adjust processability and properties of plastisol. The plastisol, which is a dispersion of fine particles of PVC in plasticizer, is coated on a substrate and heated in an oven to gel and fuse. In the gelation stage the resin particles be…
We report on a systematic study of the thin-film growth and the electronic structure of the intrinsic molecular semiconductor lutetium–diphthalocyanine (LuPc2). The films were grown in ultrahigh vacuum. Starting from submonolayer coverage, thickness-dependent x-ray and ultraviolet photoemission spectroscopy (UPS) meas…
SUMMARY Potassium release and fixation were studied on Ferralsols (typic Eutrustox) of Southern Togo both by isotopic exchange with 42 K+ ions and by exchange with 1 M ammonium acetate. Experiments were conducted on soil samples taken from surface (0–30 cm) and subsoil (80–100 cm) layers of four plots. These plats, wi…