Materials Literature
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The use of classic anticorrosive pigments is becoming more and more restricted by increasing environmental concerns; they are gradually being replaced by zinc phosphate and related compounds. Other anticorrosive pigments such as surface-exchanged silicas were also proposed. The object of this research is to study the…
In vitro folding of mature subtilisin is extremely slow. The isolated pro-domain greatly accelerates in vitro folding of subtilisin in a bimolecular reaction whose product is a tight complex between folded subtilisin and folded pro-domain. In our studies of subtilisin, we are trying to answer two basic questions: why…
A theoretical model is used to analyze the transport of U and Zr in electrorefining of irradiated binary Experimental Breeder Reactor-II fuel. A limiting-current hypothesis is advanced to explain the observed dissolution of Zr in the presence of U at high, intermediate, and low cell voltages. The internal diffusion mo…
The influence of heat treatment at and above $1100\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ on thin erbium-rich silica layers embedded in silica has been studied experimentally by secondary ion-mass spectrometry and cross-sectional transmission electron microscopy. Redistribution of erbium atoms is observed at th…
The scope of the following paper is to present, both from a theoretical and a practical point of view, some aspects involved in stress grading in the general configuration where insulated HV conductors pass through a grounded screen. The difference between capacitive and resistive materials is discussed; particular at…
This report describes space charge behavior of polyethylene (PE) grafted with acrylic monomers such as acrylic acid (AA), methacrylate (MA), ethylacrylate (EA) and n-butyl acrylate (NBA). The specimens were 0.7 mm thick with semicon electrodes, and vacuum degassed. Heterocharge is found in ungrafted control PE. This h…
Abstract The solvating strength of a plasticizer for poly(vinyl chloride) resin is a measure of the interactive forces between these two materials. Hansen's three‐dimensional solubility parameters provide a quantitative measure of these interactive forces. By using CO‐ACT SM service, a computer program designed for so…
The broadening of the ${}^{4}{\stackrel{\ensuremath{\rightarrow}}{{T}_{2}}}^{4}{A}_{2}$ luminescence band in ${\mathrm{Cr}}^{3+}$-doped aluminosilicate glasses is investigated experimentally and the results modeled using a technique that assumes contributions due to variation in both crystal-field strength and electro…
The phase transition of SrTiO3 at 105 K has been examined by studying the temperature dependence of the Young's modulus of SrTiO3 crystals along various directions. Dynamic Mechanical Analysis (DMA) at 10–140K. and 10–45Hz has been used for the experiments. The elastic behaviour is interpreted in terms of Landau theor…
The hyperthermophiles Pyrococcus furiosus and Pyrococcus abyssi make pyrimidines and arginine from carbamoyl phosphate (CP) synthesized by an enzyme that differs from other carbamoyl-phosphate synthetases and that resembles carbamate kinase (CK) in polypeptide mass, amino acid sequence, and oligomeric organization. Th…
The crystal structure of a new homologous compound series, Ga(2)O(3)(ZnO)(m) (m = integer), is determined by high-resolution lattice imaging and high spatial resolution energy-dispersive X-ray spectroscopy (EDS) analysis in a field-emission analytical transmission electron microscope. This work was carried out mainly…
The X-ray structure of the T39K mutant of the variable domain of a human immunoglobulin kappa light chain has been determined at room temperature to 1.7 A resolution with a conventional R factor of 0. 182. T39K crystallizes in the triclinic space group P1 [a = 35.4 (1), b = 40.1 (1), c = 43.1 (1) A, alpha = 66.9 (1),…
Azobenzene moieties with 3,3‘-dihexyloxy-2,2‘-dimethyl and 4,4‘-dihexyloxy substituents were attached to backbones of polymethacrylates at low contents (7 mol %) to investigate the effect of positional isomerism of the substituents on photochemical and thermal isomerization behavior and the ability to perform the surf…
The in situ copolymerization behaviour of zinc dimethacrylate (ZMA) and 2-(N-ethylperfluoro-octanesulphonamido)ethyl acrylate (RfSA) in hydrogenated nitrile–butadiene rubber (HNBR) initiated with di-tert-butyl peroxy di-isopropylbenzene (PO) was studied by transmission electron microscopy, dynamic mechanical analysis,…
The objective was to obtain the polysaccharide fraction present in the extracted polymeric matrix of a biofilm by differential precipitation of the protein content. This was tried by pH adjustment and by addition of trichloroacetic acid (TCA). The best yield of protein precipitation was with 20% (w/v) TCA, with more t…
Polyaniline grafted wool fiber was prepared by a chemical polymerization method using potassium peroxydisulfate (PDS) as a lone initiator under optimized conditions. The simultaneous homopolymer formed, as well as physisorbed polyaniline (PANI) onto wool fiber, were removed by a systematic procedure. The isolation pro…
Electronic and MCD (magnetic circular dichroism) spectra of dilutetium(III) tris(phthalocyanate), Lu 2 (Pc) 3 (Pc = phthalocyanine), its one-electron oxidation product [Lu 2 (Pc) 3 ] +, and its two-electron oxidation product [Lu 2 (Pc) 3 ] 2+ are reported. Lu 2 (Pc) 3 was prepared by a new synthetic route in which PcL…
Abstract A new technique utilizing Raman microscopy and Fourier transform infrared (FTIR) microsacopy is described. This technique uses thin films of oriented clay aggregates on glass slides suitable also for X-ray diffraction (XRD). Raman microscopy proved the most useful technique providing both better resolution of…
The magnetocaloric effect in La1.6Ca1.4Mn2O7 polycrystal with the layered Sr3Ti2O7-type perovskite structure has been studied. It is found that the magnetic entropy change of La1.6Ca1.4Mn2O7 is comparable to that of Gd, but smaller and more broadened than that of La0.8Ca0.2MnO3.
In this study, the electric‐field‐induced strain of PT‐PZ‐PMN ceramics was investigated in view of actuator applications under relatively high electric fields. The electric‐field‐induced strain was maximum at the composition x = 39.5, where x denotes the PbTiO 3 (PT) content in the formula x PbTiO 3 ·25PbZrO 3 ·(75 ‐…