Materials Literature
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The deformation mechanism of polystyrene- block -poly(ethylene- alt -propylene) diblock copolymer having soft spherical microdomains composed of poly(ethylene- alt -propylene) block chains in a hard matrix composed of polystyrene block chains under large oscillatory shear deformation with a strain amplitude of 0.41 at…
(2000). Longitudinal and seasonal differentiation of epilithic diatom communities in the uppermost sections of two mountain spring-fed streams. SIL Proceedings, 1922-2010: Vol. 27, No. 3, pp. 1591-1595.
Abstract The submitted paper reports a study of investigation of the dynamics of yarn tension, i.e. to the time dependence of the yarn tension on large-diameter circular knitting machines (LCKM). The special feature of this study is the fact that predictions are made for the course of the yarn tension during a single…
A new poly(ester amide) derived from β-alanine, 1,12-dodecanediol, and sebacoyl chloride has been synthesized and its crystalline structure studied using transmission electron microscopy and X-ray diffraction. The polymer crystallizes according to an orthorhombic unit cell with parameters a = 4.80 Å, b = 7.58 Å, and c…
Abstract Solidification in industrial processes very often involves flow fields, high thermal gradients and high pressures: the development of a model able to describe the polymer behavior becomes complex. Recently a new equipment has been developed and improved to study the crystallization of polymers when quenched u…
Various types and parameters of nozzles in the conventional ring spinning machine diversely impact yarn hairiness, which inevitably occurs during spinning. This research attempts to reduce yarn hairiness by designing an air-suction nozzles as alternatives to the commonly used air-jet nozzle, and attaching them to a co…
A computational procedure for approximating the hysteretic relationship between pore water content and pressure head in porous bodies is described. A distribution function F is introduced that retains the features of the distribution function F of the independent domain model, but its values are obtained by partitioni…
Polarized Raman spectra of tetragonally distorted (Ba1—xSrx)TiO3/MgO ferroelectric films were obtained in special scattering geometries using a micro-Raman set-up. The underdamped E(TO) soft mode was unambiguously observed in the films with x = 0.30 and 0.45. The low-temperature behaviour of the E(TO) soft mode for x…
A two-dimensional model for solidification and secondary phase precipitation in directionally solidified superalloys is presented, which makes use of a shape function approximation for the isothermal cross-section of the primary dendrites. The phase boundary is represented by a diffuse interface on a finite difference…
Despite lack of knowledge on the nucleation process, the bend domain growth is observed as a motion of disclinations, whose velocity can be determined from the energy difference between two states by applying the boundary-layer model and a damping factor. The disclination velocity is proportional to the electric field…
A novel specimen design and testing strategy has been exploited to determine the effect of thermomechanical processing on the microstructural development of the near β titanium alloy, Ti–10V–2Fe–3Al. A double truncated cone test geometry was isothermally deformed at near βtransus (∼795°C) temperatures, to obtain micro…
Co filled carbon nanocapsules, which are formed by a heat treatment of the mixture of Co and diamond nanoparticles, have been studied by in situ transmission electron microscopy (TEM), x-ray diffraction, and Raman spectroscopy. Raman studies show that the heat treatment reduces the surface native oxide (Co3O4) of Co n…
Liquid-crystal single materials with large negative dielectric anisotropies, high clearing temperatures and extremely low rotational viscosities were identified. Using these materials, the rotational viscosities for a broad range of mixture specifications were significantly reduced. Thus, these mixtures are found suit…
Glucose-1-phosphate thymidylyltransferase (RmlA; E.C. 2.7.7.24) is the first of four enzymes involved in the biosynthesis of dTDP-L-rhamnose, the precursor of L-rhamnose, a key component of the cell wall of many pathogenic bacteria. RmlA catalyses the condensation of thymidine triphosphate (dTTP) and alpha-D-glucose-1…
Phase diagrams of some compounds showing optically isotropic mesophases are compared as a function of the number of paraffinic carbon atoms per molecular core. In spite of a wide range of the transition temperatures, the number of paraffinic carbon atoms required for the appearance of the isotropic mesophases is limit…
The perplexing problem of the extremely large activation energy for nucleation Uac∼106 eV, which, as was shown by Landauer, appears in the Merz thermal-fluctuational theory of ferroelectric switching, is examined. Such enormous values of Uac are a result of the combined contribution of the energy of the depolarization…
The classical interpretation of fabric friction is viscoelastic, but its correlation with compression curves is poor. Measurements show that at low pressures, friction essentially depends as much on fabric hairiness as on compression. The limit of compressibility is a function of the yarn arrangement, the yarn structu…
The use of porous silicon (PS) as an efficient surface enlarging carrier matrix for immobilised enzymes is demonstrated. An optimal porous matrix in p-type silicon (10–20 Ωcm) with respect to enzymatic substrate turn-over was obtained when anodising the sample at 100 mA/cm2 for 5 min. An increase in glucose turn-over…
A cellular automaton–finite difference (CAFD) computer model is presented that describes the solidification of multicomponent multiphase alloys at the microscopic level. The objective of the model is to enable the prediction of microsegregation patterns and the appearance of non-equilibrium constituents during non-equ…
Efficient luminescent materials in solution, powder, or thin-film form are made here by combining poly(ethylene glycol) (PEG), terpyridine, and metal cations. Strong green emitters with a luminescence yield as high as 0.63 are reported for terpyridine–metal ion complexes suspended in liquid PEG. Evidence is presented…