Materials Literature
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We consider heat transport in a Luttinger liquid (LL) with weak disorder and study the Lorenz number for this system. We start at a high- T regime, and calculate both the electrical and thermal conductivities using a memory function approach. The resulting Lorenz number L is independent of T but depends explicitly on…
The isotopic composition of boron in illite-smectite (I-S) can be important for monitoring fluid/rock interactions in sedimentary basins. Boron substitutes for Si during reaction of smectite to illite and can preserve information about paleofluid B-isotopic composition. Boron is enriched in oilfield brines, therefore…
Measurement in the frequency range 3 mHz–10 6 Hz of the dielectric characteristics of emeraldine base polyaniline dissolved in 1-methyl-2-pyrrolidinone (NMP) and cast into bulk free-standing polymer films shows features similar to those reported by others and which are a result of microphase separation into reduced an…
Van Wyk's equations are used to approximate static low-load compression curves (maxi mum 10 gf/cm 2 ) of both woven and knitted materials generally used in garment automation. The simple two-parameter approach, which excludes the volume in unloaded conditions, is first used as an estimate and gives the starting values…
There are two anomalies at the tin bath side of silicate float glasses caused by the in-diffusion of tin into the glass melt, the tin hump in the micrometer region and the phenomenon of bloom, a microscopic wrinkling at the glass surface after reheating in air. A diffusion–reaction model is developed to explain the ti…
A polarization grating (PG) written in an azo-dye-doped film of polymer-ball-type polymer-dispersed liquid crystals was investigated. The writing beams were two mutually orthogonal (s- and p-polarized) polarized beams. The PG resulted from molecular reorientation of the liquid crystals as a result of their interaction…
One of the major concerns in the oil and gas industry is corrosion. Microbial-influenced corrosion (MIC) can be defined as the deterioration of metals by natural processes directly or indirectly related to the activity of microorganisms. MIC affects many industries, such as petrochemical, ships and marine structures,…
The lamellar structures of anionic poly(amido amine) dendrimers possessing carboxylate terminal groups at half-generations G = n .5 (G2.5 and G4.5) with the cationic surfactant didodecyldimethylammonium bromide (DDAB) were investigated by small-angle X-ray scattering (SAXS) at 25 °C. The incorporation of dendrimers in…
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…