Materials Literature
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The lattice thermal conductivity of cubic silicon carbide is evaluated by means of a microscopic model considering the discrete nature of the lattice and its Brillouin zone for phonon dispersions and scattering mechanisms. The phonon Boltzmann equation is solved iteratively, with the three-phonon normal and umklapp co…
Arsenic selenide glass optical fibers typically possess extrinsic absorption bands in the infrared wavelength region associated with residual hydrogen and oxygen related impurities, despite using purified precursors. We report a purification process based on the addition of 0.1 wt% tellurium tetrachloride (TeCl 4 ) to…
A new method of modeling three-phase transformers has been developed. The method can represent transformers with two or more windings and can incorporate the effects of interphase coupling, particularly the lowered impedance of three-phase units to zero-sequence magnetizing currents. For two-winding transformers, the…
Single crystals, with high Curie temperature ( T c ), of the x Pb(In 1/2 Nb 1/2 )O 3 – y Pb(Mg 1/3 Nb 2/3 )– z PbTiO 3 (PIMNT100 x /100 y /100 z ) ternary system near a morphotropic phase boundary were successfully grown by a conventional flux method using PbO–B 2 O 3 flux. The crystals were grown in a platinum crucib…
The result of ultrasound on polymer solutions is the breakage of macromolecular CC-bonds due to cavitation. The fact that termination reactions of mechanoradicals as disproportionation and combination are suppressed in the presence of radical scavengers makes the following method possible. Thus the use of nitroxides…
In questioned document examination and ink dating, it has been assumed that the ink inside of a pen cartridge does not begin aging until the ink is dispensed onto paper. Positive ion laser desorption (LD) mass spectra were obtained of ink-on-paper samples containing methyl violet, from new and old pens. Mass spectral…
Five new compounds were synthesized by heating mixtures of the elements at 600 - 1000 °C and investigated by powder and single crystal X-ray methods. EuMg 2 P 2 (a = 4.280(1), c = 7.164(3) Å), EuMg 2 As 2 (a = 4.393(1), c = 7.321(1) Å),EuMg 2 Sb 2 (a = 4.695(1), c = 7.724(2) Å), YbMg 2 Sb 2 (a = 4.650(1), c = 7.540(2)…
ABSTRACT Microbial biscuits of vaterite (a polymorph of CaCO3) were found in Lake Issyk-Kul, Republic of Kyrgyzstan. Four sections were defined from the inner part to the outer part of these microbial biscuits: (1) a nucleus made up of coated discrete bacterial forms, (2) a massive coating attributed to the calcificat…
We have published extensively on a lattice dendrimer model whose properties were simulated by a Monte Carlo technique. However, it has recently been pointed out that the simulation technique violated detailed balance and that the ensuing errors, at least for dendrimers without excluded volume, were relatively large. I…
This paper describes the hydrophobic transfer of unfilled room temperature vulcanized silicone rubber (RTV) resulting from UV radiation, corona discharges, high temperature, and a deposition of hydrophilic layer. The chemical and morphological structure at the surface layer and the migrating behavior of low molecular…
The work hardening properties of 99.99% purity aluminum were investigated by tensile tests at RT on samples with average grain sizes between 40 and 300 μm. It is shown that the stress–strain curves can only be described by two different functions valid at moderate and at higher strains, respectively. New constitutive…
PREPARATION AND CHARACTERIZATION OF COLLAGEN-CHITOSAN BLENDS. Biodegradable polymer blends were obtained using collagen and chitosan. Membranes of collagen and chitosan in different proportions (3:1, 1:1 and 1:3) were prepared by mixing their acetate solutions (pH 3.5) at room temperature. The blends were characterize…
We have discovered large linear electro-optics (Pockels) effect in ZnO crystalline films doped with fluorine and deposited on bare glass. A complex approach including self-consistent band structure calculations together with a Car-Parinello molecular dynamics simulation of the film–glass interface structure was used.…
Presented is a review of the discovery and characterization of the Neurospora Varkud satellite ribozyme. It outlines the approaches and observations that have led to our current level of understanding of the structure and function of this ribozyme, and highlights its distinctive features compared with other naturally…
Attempted metathesis reactions of peripherally-metallated meso-η 1 -porphyrinylplatinum(II) complexes such as trans-[ PtBr ( NiDPP )( PPh 3 ) 2 ]( H 2 DPP = 5,15- diphenylporphyrin ) with organolithium reagents fail due to competitive addition at the porphyrin ring carbon opposite to the metal substituent. This reacti…
We demonstrate a versatile interference lithography system that can continuously vary the pattern period and orientation during fabrication of general periodic structures in one or two dimensions. Initial experimental results, using closed-loop beam steering control and double exposures on a stationary substrate, are…
This paper presents a theoretical analysis of the tensile properties of plain weft-knitted fabric. Load-extension curves in the coursewise and walewise directions for fabrics made from glass fibers are theoretically calculated and compared with experimental results, and good agreement is obtained between them.
In some semiconductors, the mean free path can be greater for the phonons than for the charge carriers. When this is the case it is likely that the material will display a higher thermoelectric figure of merit in the amorphous rather than the crystalline form. Here we determine the general conditions that must hold fo…
Long-chain mannitol dehydrogenases are secondary alcohol dehydrogenases that are of wide interest because of their involvement in metabolism and potential applications in agriculture, medicine, and industry. They differ from other alcohol and polyol dehydrogenases because they do not contain a conserved tyrosine and a…
Abstract High-pressure high-temperature sintering (HPHTS) is a novel recycling technique that makes it possible to recycle vulcanized rubber powders made from waste rubber (namely scrap tires) through only the application of heat and pressure. A brief look into the mechanism of sintering will be presented along with i…