Materials Literature
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Absorption and excitation spectra of lanthanides molybdates and tungstates were measured and analyzed. Probabilitles of electronic transitions were analysed on the basis of the Judd-Ofelt theory. The significant differences of intensities were observed. Those differences could result from the symmetry changes, coopera…
The kinetics of oxidation of 2.5 mu m Nd-Fe-B powder are studied at temperatures 20, 80, 100 and 115 degrees C. The powdered alloy compromises 62.5 wt.% Fe, 35 wt.% Nd and 1.3 wt.% B. The percentage of weight gain is measured and compared with X-ray spectra recorded after various periods of oxidation. Two stages of ox…
We report the first application of a tunnel diode circuit to investigate the de Haas–van Alphen effect and superconducting critical field values in small single crystal organic conductors. The materials of interest are in the family of charge transfer salts (BEDT-TTF)2X, where X is one of a number of anion structures.…
In this paper we present data on the electro-optic switching tilt angle memorisation properties of polymer doped ferroelectric liquid crystalline mixtures. Side chain polysiloxane polymers at concentrations up to 11% w/w were added to the low molar mass mixtures ZLI-4237–000 and -100. The response times of the 11% w/w…
The electrochemical behavior of 99.999% aluminum (Al), 99.95% Al, and 99% Al in weak, acidic chloride solutions containing indium (In) salt was investigated. Activation of Al electrodes in the solution depended primarily on purity of the electrode. In all tests, time intervals between the addition of the In salt solut…
Abstract Three‐dimensional orientation distributions of grains in polycrystalline aggregates are referred to as crystallographic textures. They can be calculated from centrosymmetric two‐dimensional pole figures by means of series expansion methods or by direct methods. Both techniques lead to inaccuracies, caused by…
Water samples taken from Loch Leven, Scotland, contained unicellular centric diatoms dominated by a taxon we called Stephanodiscus hantzschii Grunow. It existed as several morphotypes, and these are described and compared with the type material of S. hantzschii from the Rabenhorst exsiccata 1104. The morphological fea…
Arsenic (As) is a widely distributed soil contaminant because of past use of As‐containing pesticides. The total As content of representative soils used for agriculture in the major soil areas of Louisiana was determined. The As content of > 450 samples ranged from near zero to 73 mg/kg with a mean of 23.2 mg/kg. Gene…
Several morphotypes of the “Orthoseira roeseana” complex from different localities have been examined and their appreciable morphological variability is illustrated and discussed. The shape of girdle-bands of “spiral” forms is described and depicted in SEM. The occurrence of valves with a ring of wall attenuations at…
Abstract The catalytic activity of polyaniline derivatives in the dehydrogenative oxidation of benzylamme to N-benzylidenebenzylamine is effected by protonic acid doping.
With a parallel component removed, the room temperature conductance of V‖amorphous-V2O5‖V sandwiches at low voltages (8<qV/kT<15) is stepped at discrete values G=2ie2/h, where h is Planck’s constant, e is the electron charge, and i is the integer or half-integer. In contrast with similar results reported…
Write and erase characteristics at low linear velocity in GeSbTe phase-change optical disks have been studied using 488 nm and 680 nm visible lasers. Good characteristics, which are carrier-to-noise ratio (CNR) of more than 50 dB and erasability of more than 25 dB, were obtained by optimizing the composition of GeSbTe…
This is a study of complement components secreted by gastric cancer-derived cell lines (MKN28, MKN45, MKN74 and KATO-III), each of which has a different histological origin. Haemolytic activity of complement component was detected only in the culture supernatant of KATO-III (C2 activity) and in that of MKN45 (C5 activ…
Magnesium alloys possess unique properties, which when fully exploited can open up for major inroads into important markets for structural applications. A density of 2/3 that of Al, and only slightly higher than for fibre reinforced plastics, combined with excellent mechanical and physical properties as well as proces…
We have measured the low-temperature specific heat C and thermal conductivity \ensuremath{\kappa} (1.5 K\ensuremath{\le}T\ensuremath{\le}30 K) of amorphous ${\mathrm{As}}_{\mathit{x}}$${\mathrm{Se}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$ in the concentration range of 0\ensuremath{\le}x\ensuremath{\le}0.72. The maximum…
Gas phase electron diffraction data have been successfully recorded for zinc phthalocyanine. Molecular structure parameters have been determined by least square fitting a geometrically consistent model of C4v symmetry to the data. The results agree well with previous x-ray diffraction studies of crystals. However, the…
Low density polyethylene has been treated using a novel surface treatment process “SICOR” (“SIIane-on-CORona” treated polymer) in order to enhance adhesion with a range of adhesives including polyure-thane, methacrylate and cyanoacrylate. The process comprises two steps, i.e corona discharge followed by application of…
Abstract The supermolecular structures of thermoreversible gels formed from either homogeneous or heterogeneous solutions were examined by scanning electron microscopy. The morphologies of gels of polyethylene and polystyrene of various tacticities were then related to the phase diagram of the polymer–solvent system.…
Abstract The viscoelastic behavior of polypropylene before and after cyclic preloading was investigated by stress relaxation tests. The relaxation tests were performed after a simple uniaxial tension (number of cycles N = 0) and after the cyclic preloading ( N = 50) by use of a closed loop, electrohydraulic, servocont…
Abstract The Ahmad‐Stepto (A‐S) theory of gelation in RA 2 + RB f polymerisations has been improved and developed to include general polymerisations of A‐ and B‐bearing reactants, namely, \documentclass{article}\pagestyle{empty}\begin{document}$$ {\sum\limits_{\rm i}}{\rm RA}{_{{\rm fai}}} + {\sum\limits_{{\rm i}}}{\r…