Materials Literature
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This paper presents an application of the Luikov system of heat and mass transfer equations in dimensionless form to predict the temperature and moisture distributions in a slab of capillary-porous material during drying. The heat and mass potentials of the external medium in the boundary conditions are assumed to var…
Abstract The rheological behaviour of liquid crystalline polymers differs considerably from that of ordinary polymers as well as of low‐molecular‐weight liquid crystals. The only theoretical approach which has reached a significant development is based on the rigid rodlike model of the polymer molecule. In spite of th…
The reaction rates between iron-chromium alloys (1.17, 5.65 and 11.96 a/0Cr) and tellurium were measured in the temperature range of 873–1,023 K at 350 Pa of tellurium vapor pressure, and in the tellurium vapor pressure range of 66.7–600 Pa at 923 K. The electron probe microanalysis, marker experiment and X-ray diffra…
Electrical conduction in amorphous Nb2O5 oxide films, obtained by electrochemical methods, has been measured in the temperature range 293 to 420 K. Different conduction processes are considered, depending on the applied electric field. At low fields, the results are consistent with a Small Polaron Hopping process in t…
The crystal structures of two hydrothermally grown polymorphs of nickel orthoarsenate o- and mNi3(AsO4)2 have been determined by single-crystal X-ray diffraction. Crystal data: o-Ni3(AsO4)2, Mr = 454.01, orthorhombic, Cmca, Z = 4, F(000) = 859-95, a(Mo Ka) = 0.71069 A, T = 295 (1) K, a = 5.943(2), b=11.263(4), c=8.164…
Article On the Existence of the Fe2Nb3 Phase in the Fe-Nb System / Zur Existenz der Phase Fe2Nb3 im System Fe-Nb was published on August 1, 1991 in the journal International Journal of Materials Research (volume 82, issue 8).
Investigations have been performed on improvement of TL sensitivity and hardness of solid CaSO4:Dy and CaSO4:Tm detectors. The dosimetric properties of improved TLD sintered pellets have been evaluated on different types of commercial TLD readers.
Abstract In certain extrusion operations, particularly the production of plastic pressure pipe, it would be desirable to be able to control the degree and direction of molecular orientation. While dies can be designed to generate various types of orientation, most of this is lost at the die exit due to extrudate swell…
The time-dependent phenomenon of delayed elasticity was studied at room temperature and is presented here for Zerodur and ULE. The effect is believed to be related to the alkali oxide content of the glass and to the rearrangement of the ion groups within the structure during stress.
Abstract Potential dependences of the Current and differential double‐layer capacity were used to investigate the processes that take place on a graphite electrode in acidic media containing 1, 5‐diphenylcarbazide (DPCI) and 1, 5‐diphenylcarbazide (DPCO). It is shown that adsorption of the enol form of these compounds…
Results of nonresonant and resonant Raman scattering from single crystals of ${\mathrm{Zn}}_{3}$${\mathrm{P}}_{2}$ are reported. When the exciting radiation energy is tuned well above the 1.5-eV fundamental absorption region, zone-center optical phonons are observed that are consistent with the tetragonal crystal stru…
ADVERTISEMENT RETURN TO ISSUEPREVArticleControlled synthesis and spectroscopic characterization of multifunctional hybrid silazane/silylamine preceramic telechelic oligomersKe Feng and Yitbarek H. MariamCite this: Macromolecules 1991, 24, 16, 4729–4732Publication Date (Print):August 1, 1991Publication History Publishe…
Abstract Ethylene‐vinyl alcohol (EVAL) copolymers and ethylene‐vinyl alcohol‐vinyl acetate (EVALVA) terpolymers with different VA content were achieved by hydrolysis of ethylene‐vinyl acetate (EVA) copolymers of low vinyl acetate content. Several experimental techniques (elemental analysis, thermogravimetry, NMR and I…
The axisymmetrical steady flow of an incompressible nematic liquid crystal around a sphere is studied on the basis of the Leslie-Ericksen equations. We assume low Reynolds numbers and a fixed director orientation parallel to the moving sphere (or the moving liquid crystal at infinite distance). The influence of the Le…
Article The crystal structure of rutile as a function of temperature up to 1600° C was published on August 1, 1991 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 194, issue 1-4).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic susceptibility, EPR, Moessbauer, and x-ray investigations of heteropolynuclear clusters containing iron(III) and copper(II) ions: {Cu(Mesalen)}2 Fe(acac) (NO3)2 and {Cu(Mesalen)}3 Fe(acac) (PF6)2Irene Morgenstern-Badarau, Daniel Laroque, Eckhard Bill, Heiner Winkler…
Abstract Successive temperature-programmed desorption (TPD) after temperature-programmed reduction (TPR) (Combined TPR-TPD) was performed in order to characterize supported platinum catalysts (Pt/SiO2, Pt/Al2O3, Pt/ZrO2 and Pt/TiO2) as well as to judge the validity of the apparent TPR profiles. In successive H2-TPD ru…
Summary This paper presents the results of laboratory investigations conducted to better our definition of the serviceability of bimetallic pipe manufactured by the thermohydraulic (tight-fit) method for Mobile Bay service. Both Alloy 625/API X-65 and Alloy 825/API X-65 tight-fit pipe (TFP) were evaluated under condit…
Heat-capacity measurements by adiabatic equilibrium calorimetry are reported for γ-phase Pr2S3, Tb2S3, and Dy2S3 between 5 and 350 K. Highly purified samples were prepared and their composition verified by chemical analysis. Precision lattice parameters were determined for each compound and are compared with literatur…
Under shear, nematic liquid crystals can exhibit localized excitations that propagate much faster than simple one-dimensional analysis can predict. We describe a two-dimensional theory in which the excitations are fronts between distinct solutions of the steady-state Ericksen-Leslie equations. We find that a front's s…