Materials Literature
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The first part of this article centers on the fact that key features of the dynamical response of weakly-correlated materials (the alkalis, Al), have been found experimentally to differ qualitatively from simple-model behavior. In the absence of ab initio theory, the surprises embodied in the experimental data were im…
Creatine kinase is a key enzyme in the energy homeostasis of cells and tissues with high and fluctuating energy demands. Human muscle MM creatine kinase is a dimeric protein with a molecular weight of approximately 43 kDa for each subunit. It has been crystallized by the hanging-drop vapor-diffusion method using 2-met…
The paper is devoted to a determination of effective piezoelectric coefficients d3j poly and e3j poly (j = 1, 2, 3) of boracite crystals with 180° domain structure. Some features of these coefficients and their anisotropy are studied for different domain volume concentrations and/or temperatures.
Phosphorus (P) doped diamond thin films were grown by microwave plasma-assisted chemical vapor deposition (CVD) using phosphine (PH3) as a dopant source. The addition of PH3 in the gas ambient significantly influenced the optimal growth condition for diamond. The {111} surface of diamond was found to be the best surfa…
PMN ceramics present piezoelectricity under an applied dc bias field. The relative dielectric permittivity varies, in general, over a wide range of values of the applied dc electric field. The purpose of this work is to study the induced piezoelectricity effect produced by an applied dc electric field in the 2.7PMN-0.…
Abstract The mechanism of 2- t -butylbenzothiazole sulfenamide (TBBS) accelerated sulfur vulcanization of polyisoprene was investigated. Samples of compounded rubber were heated in a differential scanning calorimeter to preselected temperatures or degrees of vulcanization, the reaction stopped, and the products analyz…
We report the spin-polarized as well as non-spin-polarized band structure calculations of CrO 2 based on the local spin-density approximation of the density functional theory. Our result shows that the Fermi level of magnetic CrO 2 is located in an insulating gap in the minority-spin bands between oxygen p and chromiu…
Optical microscope observations and linear birefringence measurements were performed to obtain more information on the phase transitions and phases properties of the N(CH3)4FeCl4 single crystal. At least four phase transitions of first order were detected (at 385 K, 303 K, 294 K and 265 K on cooling), some of them of…
Poly(diphenylamine-4,4 ′ -diyl) receives electrochemical oxidation with E pa of about 0.6 V vs Ag/AgCl with a high doping level (number of positive charges stored per the repeating unit of the polymer) of about 2 in aqueous H 2 SO 4 solutions. The oxidized polymer exhibits an electrical conductivity of 0.2 Scm -1 at r…
Phases formed upon isothermal treatments of sol-gel prepared PZT andPLT films at different temperatures have been determined. In PZT, the sequence of phase formation with increased temperature is found to be: Amorphous → Amorphous + Pyrochlore + PbO → Pyrochlore + PbO → Pyrochlore + PbO + Perovskite → PbO + Perovskite…
This handbook is based on an earlier French laboratory guidebook A Guide on Radionuclides and Radioprotection by D Delacroix et al published in 1994. The earlier publication was orientated towards guidance on the handling of radionuclides used in medicine. The main purpose of this handbook is the provision of data she…
The spectrum of luminescent F centers generated in high-purity KCl crystals by 7–10.2-eV photons has been measured at 230 K. The pulsed annealing of these centers (250–550 K), as well as the dependence of the efficiency of stable F-center generation on irradiation temperature (80–500 K) has been studied. The efficienc…
The solidification process and hardenability of high speed steel type cast irons were investigated using a series of hypo-eutectic alloys of Fe-% C-5% Cr-5% Mo-5.5% V-(0,5)% W-(0,5)% Co-(0,5)% Ni and a hypereutectic Fe-2.3% C-5% Cr-5% Mo-9% V-5% W-5% Co alloy. In each hypo-eutectic alloy, the crystallization proceeds…
Abstract The interaction of sulfur, ZnO and 2- t -butylbenzothiazole sulfenamide (TBBS) was investigated by differential scanning calorimetry (DSC) in the absence of rubber. Special reference was made to the role of the amine, the distinguishing characteristic of all sulfenamides. TBBS decomposes rapidly at 211 °C, th…
A straightforward and generalizable synthesis of metal-free (H2) and metal derivatives (M = Ni, Co or Zn) of a symmetrically tetrasubstituted phthalocyaninc derived from tetrathiooxaphthalonitrile is described. All of these complexes were insolublc in common solvents such as DMF, chloroform. ethanol and water. Structu…
The uvarovite garnet (CaO)3 (Cr2O3 )(SiO2 )3 has been synthesised (mineralised with borax to facilitate diffusion of precursors) by several sol–gel methods. Two routes for uvarovite formation have been observed: where CaCrO4 forms as an intermediate phase; and where metastable pseudowollastonite (α-CaSiO3 ) forms as a…
Three antimony-containing polymers (P1, P2, P3) were synthesized by reacting triphenyl antimony dinitrate with bisphenol A (P1), with tetrabromobisphenol A (P2) and with N,N′-bis(4-hydroxybenzylidene)-oxydianiline (P3). Solubility, density, chemical and thermal stability of these antimony polymers have been evaluated.…
Two homeotypical phases occur at the mole fraction x Al ≈0.75 in the ternary system Co-Ni-Al: the pseudoternary intermetallic compound ( Co , Ni ) 4 Al 13 ( h ) (space group C 2/ m , Pearson code mC (34-1.8)) [Notation, according to Parthé et al. ( 1993 ). TYPIX, Standardized Data and Crystal Chemical Characterization…
This paper discusses the process by which a thermodynamically unstable impurity atmosphere consisting of hydrogen atoms displaces an edge dislocation. Relationships are obtained for the displacement force in the approximation of dilute solid solutions. The results of theoretical analysis are used to explain the hydrog…
Pressure dependence of the hydrostatic piezoelectric coefficient dh was measured for PVDF and P(VDF-TrFE) polymer foils in the range up to 60MPa. The hydrostatic strain coefficient dh, the hydrostatic voltage coefficient gh and figure of merit dh·gh were determined using the static method. Electric charge induced acro…