Materials Literature
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Abstract Preparation, morphology, and mechanical properties were studied of blends of a thermotropic liquid crystalline polymer (TLCP) with two different grades of polypropylene, one with and one without overlap in processing temperatures, using two different blending methods. The highly viscous grade (PP‐1) was of su…
By studying the electro-optical properties and the textures of the subphases successively emerging between antiferroelectric SC A * and ferroelectric SC* (the Devil’s staircase), we have revealed several interface effects in both homogeneous and homeotropic cells; free-standing films are most suitable for making obser…
A study of the Na 0.5 Bi 0.5 TiO 3 –PbTiO 3 and K 0.5 Bi 0.5 TiO 3 -PbTiO 3 systems has been carried out using X-ray diffraction, differential scanning calorimetry and dielectric measurements. The limits of the rhombohedral (Na 0.5 Bi 0.5 TiO 3 -rich side) and tetragonal (PbTiO 3 -rich side) solid solutions have been…
A method for the preparation of nanoparticles of iron nitride powders is reported. Iron nitride particles have been synthesised by two methods. In the first, Fe(CO)5 was sonicated in a decane solution under a gaseous mixture of NH3 and H2 (3.5:1 molar ratio) at ca. 0 °C. The second method was based on nitriding the so…
Hysteresis is a phenomenon common to a broad spectrum of physical systems. As such, it is often present in plants for which controllers are being designed, where it introduces a problematic nonlinear multivalued behavior. Continuing research into nonlinear systems is generating an increasing interest in the control of…
Abstract The thickness of the boundary layer surrounding polyhydroxyalkanoic acid (PHA) inclusion bodies in bacteria was determined from electron micrographs of ultrathin cell sections. The obtained values were compared with the thickness of boundary layers of other kinds of prokaryotic inclusion bodies known to be mo…
Product gas analysis using quadrupole mass spectrometer (QMS) and infrared reflection absorption spectroscopy (IRAS) have been performed to investigate the catalytic decomposition of formic acid on NiO(111) film grown on Ni(111) surface under steady-state conditions and the results have been compared with the previous…
Cu/ZrO2 catalysts show high activity for the NO–CO reaction, even at low temperature (100–200°C). The structure and reduction behaviour of ZrO2-supported Cu species have been characterized by means of X-ray absorption near-edge structure (XANES), extended X-ray absorption fine structure (EXAFS), FTIR and temperature-p…
The geometry of two-components yarns is investigated, and a new approach is presented which addresses some of the limitations of other models The model takes account of the compressional deformation of the individual strands caused by transverse forces generated during the twisting process. The change in the cross-sec…
Super-resolution readout for read-only optical disks was demonstrated using a photochromic mask layer. Nonlinear transmittance change, which is desirable for effective super-resolution readout, was achieved using a the photochromic mask layer with an optical density of 0.5. The photochromic super-resolution method is…
The sintering behavior of hydrothermally synthesized cubic and tetragonal BaTiO 3 powders was studied as a function of temperature. In addition, the dielectric properties of the sintered samples were examined from room temperature to 200°C at a frequency of 1 kHz. The influence of powder characteristics and sintering…
The synthesis of a novel layered sodium titanosilicate, Na3(Na,H)Ti2O2[Si2O6]2.H2O (AM-4), and the solution of its crystal structure by ab initio methods are reported.
Piezoelectric ceramic/polymer composites, also known as piezocomposites, have been developed over the past two decades for electromechanical transducers to be used in both military and civilian applications. Recently, the thrust in these transducers is toward high operating frequencies, requiring fine-scale (<200-μm c…
The microwave-assisted acid dissolution of sintered bodies of 28 structural and electronic advanced ceramic materials was systematically evaluated. These materials included zirconia-based ceramics, such as m-ZrO2 (a non-stabilized monoclinic zirconia), Ca-PSZ and Mg-PSZ (two partially stabilized zirconias), Y-FSZ (a f…
Molecular modeling techniques using attachment energy calculations have been applied, for the first time to our knowledge, to simulate the morphology of an organic hydrate: alpha-lactose monohydrate. Calculation of the strong intermolecular forces using the atom-atom approximation and the potential parameters of Nemet…
We examined the species composition and concentrat~on of planktonic algae as well as irradiance and near-surface temperature and sal~nity 3 times per week for 1 yr in a turbulent marine environment with con.tinuously high nutrient concentrations Seasonal variations in tempera.ture and sahn~ty were small, and diatoms c…
The pyrolysis of trifluoroacetic acid has been carried out in the temperature range 513–593 K both as the neat gas and also in the presence of nitrogen as diluent. Reactions were carried out in a sealed sodium borosilicate glass cell, and the progress of the reaction was monitored by in situ Fourier transform IR spect…
We comprehend both interconnect electromigration and Joule heating to study for the first time the self-consistent solutions for the maximum allowed interconnect peak current density j/sub peak/ as a function of wave shape. The maximum allowed temperature and j/sub peak/ solutions monotonically increase as the duty cy…
The influence of V2O5 loading (2–50 wt.%) on surface structures and the reduction pattern of V2O5/SiO2 (VPS) catalysts has been systematically investigated by diffuse reflectance UV–VIS spectroscopy and temperature-programmed reduction (TPR) measurements in the temperature range 200–1100°C. Both TPR and UV–VIS spectra…
PURPOSE: To determine the effective time window for MR imaging of tumors with blood-brain barrier (BBB) damage after injection of Gd-containing contrast media. MATERIAL AND METHODS: Eleven patients with 15 brain lesions (metastasis, glioma, abscess) were studied with a T1-weighted spin-echo sequence repeated over peri…