Materials Literature
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Time-averaged structure-factor restraints have been used in two molecular dynamics refinement schemes to define ensembles of conformations for myoglobin that fit the experimentally measured Bragg scattering from P6 crystals. The geometries of the structures have been maintained to the same currently acceptable limits…
A new nitronyl–nitroxide radical, 2-(p-dimethylaminophenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide, hereafter denoted NIT(p-NMe2)Ph, has been synthesized. It crystallizes in the P21/c, space group, with a= 15.742(2)Å, b= 10.875(4)Å, c= 19.011(5)Å and β= 113.26(2)°, the asymmetric unit containing two independent…
We studied the liposome formulation characteristics of eight new lipophilic antitumour agents that have demonstrated a broad spectrum of antitumour activity in preclinical in vitro and in vivo screening models. Multilamellar vesicles were prepared by using standard evaporation/hydration methods. The drug to lipid weig…
The evolution of a one-dimensional Ising model with Glauber dynamics and an extrinsic energy barrier, submitted to continuous cooling and heating processes, is studied. The model is shown to exhibit many of the properties observed in real glasses. Under slow cooling, the dependence of the residual energy on the coolin…
In this study, Mg-10mass%Gd or Dy-2 or 3mass%Nd alloys containing zirconium as a grain refinement agent were melted for the purpose of further improvements of various properties. Aging characteristics and tensile properties up to 350°C of these alloys were investigated. Hardness at peak-aging becomes higher by the add…
Sintered bodies of BaM2O4 (M: La, Nd, Sm, Gd, Ho or Y) with CaFe2O4-related structure were synthesized by sintering BaCO3-M2O3 mixtures. The temperature dependence of oxygen ionic conductivity and the relationship between the ionic radius of M3+ ions in B sites and the crystal structure of BaM2O4 were investigated. Th…
This paper provides a method for evaluating three lumped equivalent capacitances which take into account the physical effects of stray capacitances in two coupled inductors. Capacitance evaluation is performed in two steps: (i) initially, the resistance and leakage inductance of each winding, together with the magneti…
The direct analysis of dissolved spent nuclear fuel by inductively coupled plasma mass spectrometry (ICP-MS) allows the elemental and isotopic composition of the irradiated fuel to be determined without any chemical separation. A qualitative evaluation was carried out on the effects of fission, β-decay and neutron-cap…
The variation of the linear electro-optic effect in (-)-2-(α-methylbenzylamino)-5-nitropyridine with the wavelength of the incident light at room temperature has been measured. The reduced half-wave voltages have been found to have the values 2.1, 2.8, and 6.0 kV at 488, 514.5, and 632.8 nm respectively and the corres…
The crystal structure of hexylheptahydrooctasilasesquioxane C6H13(H7Si8O12) has been determined by single-crystal X-ray diffraction and compared with the structures of H8Si8O12, [Co(CO)4(H7Si8O12)] and (CH3Si8O12. The monosubstituted Silasesquioxane molecules have a crystallographic C1symmetry. The local symmetry of t…
Abstract This paper presents information on the preparation of the network polyester films from glycerol (Y g ) and aromatic dicarboxylic acids of phthalic anhydride (P), dimethyl isophthalate (I) and dimethyl terephthalate (T), as well as aliphatic dicarboxylic acids of adipic, sebacic, 1, 10‐decanedicarboxylic and 1…
Many methods have been proposed for the determination of the hysteresis loops of magnetic materials, and many mathematical approaches have been proposed to find a good model for the hysteresis phenomenon. However, very few attempts have been made to determine the parameters of the hysteresis model experimentally. This…
The syntheses and X-ray crystal structures of the isoleptic ytterbium complexes [Yb(tdmp)2]O3SCF3, 1, and [Yb(tdmp)2], 2, are reported [tdmp = hydridotris(3,5-dimethylpyrazol-1-yl)borate]; the average metal to ligand distance increases by 0.16 Å(ca. 7%) upon reduction.
The reaction of oxoiron(IV) tetra(2-N-methylpyridyl)porphyrin (OFeIVT2MPyP), generated from iron(III) tetra(2-N-methylpyridyl)porphyrin and tert-butyl hydroperoxide, with 3-cyanophenol in aqueous solution (pH 7.7) shows first-order dependence on the concentration of the phenol and the oxidant. The pH dependence of the…
The kinetics and mechanism of the oxygenation of Mn(TMP)Cl, Mn(TDCPP)Cl and Mn(Br8TMP)Cl by Ph4PhSO5 has been investigated in 1,2-dichloroethane and acetonitrile. In both solvents the reaction takes place only in the presence of species acting as axial ligands of the manganese porphyrins, e.g. imidazole or 4-tert-buty…
Because of the wide variety of phenomena associated with the split of two-phase flow at junction, the problem has been approached from two extreme ends. High quality annular or stratified flow and low quality, stratified or bubbly flow are considered separately. Data, phenomena and models are considered for each case.
Protein kinase CK2 subunits alpha and beta were expressed either separately or together in a bacterial expression system (pT7-7/BL21(DE3)) and purified to homogeneity. After mixing the subunits, a CK2 holoenzyme (alpha 2 beta 2) was spontaneously reconstituted, which displays identical features as the native enzyme. T…
Several diffractive optical elements that operate in the infrared are presented. The microrelief structure is either a V-groove or binary lamellar and the features are of the size of one wavelength or below. The applications of these elements are beam deflectors, beamsplitters, beam attenuators, and polarizers.
Abstract Phospham is an iminophosphazene polymer of unusually high thermal stability. We have found that phospham imparts a substantial level of flame retardancy to nylon‐4,6, a high‐melting crystalline engineering thermoplastic. It did not appear to produce degradation of the polyamide in the processing temperature r…
Abstract Daß Mikroorganismen organische Werkstoffe angreifen, ist seit langem bekannt. Daß sie auch mineralische, metallische und synthetisch‐organische Werkstoffe angreifen können, ist eine relativ neue Erkenntnis. Es wird geschätzt, daß mindestens 20% aller Korrosionsschäden an Metallen und Baustoffen mikrobiell bee…