Materials Literature
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The differential sdlubility and thermal analysis of three kinds of polyester fibers designed for rotor, worsted ring, and carded ring spinning are measured. Poly(ethylene terephthalate) yarns are obtained through the three processes and then analyzed. Using a thermomechanical analyzer, the thermal transitions of the d…
The effects of filler loading and a silane coupling agent, bis (triethoxysilylpropyl) tetrasulphide, Si69 on the dynamic properties and swelling behaviour of bamboo fibre filled natural rubber composites were studied. The dynamic properties such as minimum elastic torque, S′ @ ML, maximum elastic torque, S′ @ MH, tan…
This paper discusses the various methods for sulfur hexafluoride (SF/sub 6/) separation from a mixture of low concentrations of SF/sub 6/ in N/sub 2/ pressure swing adsorption (PSA) with a suitable kind of synthetic zeolite, which has the expected molecular sieving effect. This molecular sieving effect, derived from m…
A variety of directly-linked diporphyrins can be prepared by an oxidative coupling reaction of 5,15-diaryl metalloporphyrins. Regioselectivity of the coupling reaction depends on the metal in the porphyrin core; Zn II -porphyrins favor meso-meso coupling and Pd II -porphyrins favor meso-β coupling. β-β Linked diporphy…
A single-crystal investigation of spodumene from a granitic pegmatite in Minas Gerais, Brazil, was undertaken using neutron (54 K) and X-ray diffraction (room temperature) (R all = 2.8% and 1.9%, respectively). In both refinements, space group C2/c was assigned; the presence of several reflections violating the c glid…
On the basis of a literature review, an additional criterion of resolution of diffraction curves into crystalline peaks and amorphous component, in generally used Hindeleh-Johnson method of the polymers crystallinity degree (SK) determination, has been proposed. Besides two classical optimization methods by Powell and…
The coordination of diphenyl(phenylacetenyl)phosphine (DPAP, 1) to (X)Rh(III)TPP (X = I (2) or Me (3); TPP = tetraphenyl porphyrin) was studied in solution and in the solid state. The iodide is readily displaced by the phosphine, leading to the bis-phosphine complex [(DPAP)(2)Rh(TPP)](I) (4). The methylide on rhodium…
The cold roller straightening operation is the most critical process for the development of residual stress in rails during manufacturing. Knowledge of the residual stress in ‘as-manufactured’ rails is important for evaluation of the fatigue behaviour of rails during actual use. While experimental investigations have…
The lack of malolactic activity in H(+)-ATPase-deficient mutants of Oenococcus oeni selected previously was analyzed at the molecular level. Western blot experiments revealed a spot at 60 kDa corresponding to the malolactic enzyme only in the parental strain. Moreover, the mleA transcript encoding the malolactic enzym…
It has long been accepted that bacterial quinol-fumarate reductase (QFR) generally uses a low-redox-potential naphthoquinone, menaquinone (MK), as the electron donor, whereas mitochondrial QFR from facultative and anaerobic eukaryotes uses a low-redox-potential benzoquinone, rhodoquinone (RQ), as the substrate. In the…
A computer-based partial discharge detector has been used to measure AC corona pulses in air in a point-cup electrode system. The pulse height distribution was measured as a function of phase angle and pulse height for a range of voltages. The onset voltages for both positive and negative half-cycles are the same, and…
P-type PtSi/porous Si Schottky detectors exhibit efficiencies as large as 60% in 2 to 7 /spl mu/m spectral range. Such efficiencies are larger than theoretical limit for regular PtSi detectors, as predicted by the modified Fowler theory. In the porous detectors a thin PtSi layer covers the walls of the pores creating…
This work provides a crystal-chemical description of the trioctahedral sheet in 1M mica polytypes of C2/m symmetry. Some octahedral parameters were found to be related strictly to octahedral chemical composition, whereas others were related to the overall layer chemistry. As a general rule, the M1 site is more affecte…
Sum-frequency vibrational spectroscopy was employed to study surface glass transition of poly(vinyl alcohol) by monitoring the relaxation of rubbing-induced alignment of surface chains with increase of temperature. The observed chain relaxation is two-dimensional, parallel to the surface. The surface transition temper…
The surface and subsurface layers of cast iron articles upon electrolyte-plasma treatment (EPT) were studied for the first time by a combination of methods, including Rutherford backscattering, elastic recoil detection analysis, X-ray diffraction, optical metallography, and microhardness measurements. It was found tha…
As part of an ongoing research program on the effects of laundering on plain woven cotton fabrics, specimens of poplin and sheeting fabrics with and without a DMDHEU wrinkle resistant finish are laundered under regimes designed to evaluate the effect of five common home laundering variables: use of detergent, rinse cy…
Working insulators begin failing as airborne contaminants and moisture from natural wetting combine on insulator surfaces to cause a drop in surface resistivity. This enables current to conduct across the insulators, thereby changing the electrical activity exhibited by the insulators when clean. If the drop in surfac…
A brief account of transformations of internal structure of hydrogen bonds, and transformations involving the breaking and formation of hydrogen bonds is highlighted for a selected group of crystals. The main stress is laid on the short bistable –OH…O= hydrogen bonds, illustrating several general properties, often blu…
Abstract Long‐term monitoring (for 8000 exposure hours) of titanium and its implant alloys (Ti‐5Al‐4V, Ti‐6Al‐4Fe) interactions with Ringer's solutions of different pH‐values (2.5, 4.35, 6.98), simulating various conditions that can appear at the contact between implant and tissues was carried out in this paper. All d…
RAW 264.7 macrophages express nonmuscle myosin heavy chain II-A as the only significant nonmuscle myosin heavy chain isoform, with expression of nonmuscle myosin heavy chain II-B and II-C low or absent. Treatment of the cells with sodium butyrate, an inhibitor of histone deacetylase, led to the dose-dependent inductio…