Materials Literature
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A factorial design was performed to determine the statistical effects of material compositions and extrusion processing variables on the foamability of polypropylene (PP)/wood-flour composites. Two levels with centrepoint values of wood flour content, chemical foaming agent (CFA) content, extruder's die temperature an…
Nineteen Thalassiosira species informally referred to as the plicated Thalassiosira were examined in a cladistic analysis. The species range in age from 17 Ma to modern, representing the earliest known members of the group and its most recent members. Two most parsimonious cladograms were discovered, generally agreein…
A series of telechelic oligo[(R,S)-3-hydroxybutyrate]-diols (PHB-diols) was synthesized from ethyl (R,S)-3-hydroxybutyrate (ethyl (HB)) and four different aliphatic diols, namely, 1,4-butanediol, 1,6-hexanediol, 1,8-octanediol and 1,10-decanediol by transesterification and condensation in bulk. The structures of the s…
The Langmuir films of two liquid crystal materials, 4-octyl-4'-cyanobiphenyl (8CB) and 4-pentyl-4"-cyano-p-terphenyl (5CT), and of their mixtures have been studied by recording surface pressure-area isotherms and Brewster angle microscopy (BAM) images. The pure liquid crystals revealed very different characters of the…
The aqueous polymerization of m-methylaniline (mMA) was studied using sodium dichromate as oxidant in the presence of hydrochloric acid. The effect of hydrochloric acid, sodium dichromate and monomer concentration on the polymerization rate, specific viscosity of the obtained polymer and a.c.conductivity was investiga…
Conventional methods for the synthesis of fullerenes and carbon nanotubes such as laser or electric arc ablation have failed when the process is scaled up. Our ultimate goal is to scale a solar process up from 2 to 250 kW; this paper shows that our method for achieving this scale-up is valid because we were able to pr…
A therapeutic support for the less effective steps in skin’s recovery should improve reparative capacity. A morphological and immunohistochemical evaluation of tissue repair in rats in the presence...
The object was to perform simultaneous quantitative analyses of complex pharmaceutical solid mixtures by the Rietveld method. Mixtures consisting of anhydrous β-carbamazepine, anhydrous α-carbamazepine, and carbamazepine dihydrate were chosen as the model system. Lithium fluoride was used as the internal standard. Mix…
Luminescence offers a sensitive probe of the quality of Nd:YAG laser material both in the bulk and, via cathodoluminescence, in the near surface layers. The spectral signals are primarily from the Nd dopants, but the thermoluminescence spectra reveal traces of impurities such as Tb, Cr and Mn. Control of the electron…
Transmission electron microscopy (TEM) and energy dispersive X-ray (EDX) analysis were used to characterize naturally weathered layers on the surface of volcanic glass, bytownite, hypersthene, and secondary precipitates in volcanic ash erupted from the Sakurajima volcano, Japan. TEM analysis of the volcanic ash reveal…
Steady state and time-resolved photoluminescence measurements of a homologous series of CdSe cluster molecules were performed over a broad temperature range (T = 5–200 K). The absorption and low temperature PLE onset of the clusters shifts systematically to the blue in smaller clusters, manifesting the quantum confine…
The synthesis and evaluation of the liquid crystalline properties of non-conventional liquid crystals, consisting of two non-identical mesogenic segments interconnected via a paraffinic chain spacer, are of considerable current interest. In particular, chiral dimesogens possessing a cholesteryl ester unit as the chira…
We present results of the feasibility study on photoaddressable polymers (PAPs) applied to optical disc systems. PAPs represent a new class of organic rewritable materials that exhibit a huge signal birefringence ( Δ n ) at the readout wavelength. By optimizing the disc structure and the readout optics, the signal amp…
The non-resonant nonlinear optical properties of CdS nanocrystals (NCs) embedded in silica (i) and forming matrix-free (MF) almost close-packed films (ii) were studied using the Z-scan technique. Among the group (i), samples containing NCs covered with a HgS and CuS shell were investigated. The highest value of the no…
Sol–gel films containing manganese-doped CdS nanocrystals are synthesized. Photoluminescence spectra and kinetics of the Mn2+ ion emission at room temperature have been studied. It is found that the quantum confinement effect does not modify the emission lifetime as compared to bulk material.
One of the agro-environmental characteristics of Brittany is the extensive use of pesticides, which leads to high concentrations of atrazine in continental water systems. Periphytic algae play a basic part in aquatic ecosystems and some of them, diatoms, are highly sensitive to environmental changes. Analyses of diato…
Twenty hours of mechanical activation of mixed oxides at room temperature led to the formation of Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) in excess PbO. The crystallinity of the activation‐derived perovskite PMN phase was further established when the activated PMN–PbO phase mixture was subjected to calcination at 800°C. Pyrochlor…
We report on mass spectroscopic measurements of species originating from a microwave (MW) discharge plasma under simulated diamond deposition conditions. The plasma is produced in a 30 W MW flow tube through which flows a gas mixture of about 1% methane admixed in hydrogen. Plasma composition was investigated as a fun…
ABSTRACT: A considerable amount of squid mantle collagen, 45% to 70% of total collagen, was not solubilized even after 30 min of heating in boiling water with its fibrous structure left intact. Pyridinoline, one of the major intermo‐lecular crosslinks in matured collagen, was more predominantly included in the insolub…
Abstract When antisolvents are applied to crystallize sodium carbonate from aqueous solutions, the transition temperature at which the hydrates are in equilibrium is decreased. Two models proposed can predict the influence of the amount and type of antisolvent on the transition temperature. Only binary data of the wat…