Materials Literature
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The aerobic photocatalysed oxidation of alkanes in the presence of decatungstates Q4W10O32(Q = Na, Me4N, Pr4N, Bu4N, Hex4N) leads to hydroperoxides as primary products. Nitrile solvents and organic counter-ions of the catalyst compete in this photooxidation with alkane substrate. The influence of this competition on q…
The failure rates of synthetic vascular grafts, when placed in low blood flow environments in humans, are not acceptable. Thus, endothelial cell (EC) seeding technology of vascular grafts was developed to prepare prostheses lined with a human monolayer expressing optimal thromboresistant properties. In a clinical sett…
Drainage of the continuous phase liquid from a foam plays a pivotal role in determining its stability to collapse. A theoretical model for the drainage of the liquid during generation of a foam by bubbling and its subsequent collapse is presented. The model accounts for drainage in the films as well as in the plateau…
A small Cyclotella species was abundant in the plankton of Lake Kinneret (Israel). This species showed large phenotypic plasticity with morphological characteristics of several known Cyclotella taxa (C. comensis Grunow, C. ocellala Pantocsek, C. kuetzingiana var. planetophora Fricke and var. radiosa Fricke). It repres…
SiO2/TiO2 multilayers stacks used in optical coatings have been studied by Electron En- ergy Loss Spectroscopy (EELS). The line-spectrum mode has been used: the incident electron probe of the STEM is scanned under digital control on the specimen surface in the direction perpendicular to the layers, while the whole spe…
Crystallographic evidence suggests that there is a large hinged domain motion associated with substrate binding in adenylate kinase. To test this hypothesis, resonance energy transfer measurements of substrate binding were initiated. Adenylate kinase from Escherichia coli consists of three domains: the main body of th…
The hydrogen uptake behavior of two types of Zircaloy-2 specimens containing either fine intermetallic precipitates or coarse ones was studied at 623–723 Kin the pre-transition period of oxidation to clarify the role of the precipitates in the hydrogen transport through the oxide film. In the former case, the amount o…
By applying fluorescence together with DSC and WAXD, structure analysis for a thermotropic liquid-crystalline (LC) polyester (PB-10), prepared from 4,4‘-dihydroxybiphenyl and sebacic acid, containing 10 methylene units, was carried out. The PB-10 shows two enantiotropic transitions: One is the crystal−smectic H transi…
Three iron complexes of the meso-dioxo derivative of octaethylporphryin (trans-H(2)OEPO(2)) were characterized by X-ray diffraction. Green ClFe(III)(trans-OEPO(2)).1.5C(6)H(6) crystallizes in the monoclinic space group P2(1)/c with a = 13.766(3) Å, b = 19.075(3) Å, c = 15.217(3) Å, beta = 99.87(2) degrees at 123 K wit…
A direct current glow discharge mass spectrometer has been used for the analysis of Macor, a nonconducting glass ceramic. To overcome the problem of the conductivity barrier, a tantalum secondary cathode was placed in front of the flat Macor sample. Although the sample characteristics of Macor (the electrical conducti…
The structural and energetic consequences of nonbonded interactions between axial ligands and minimally superstructured borylated iron bis(dioxime) complexes are described. Structural data for 20 low spin axially ligated derivatives are compared. Complexes of Fe((DMG)BPh 2 ) 2 (Py)L, L = NH 3, TCNE, PMePh 2, and Py an…
Crystalline silicon is the principal semiconducting material and will doubtless continue to be the mainstay in the electronics industry for the foreseeable future. However, silicon is lacking the properties necessary to emit light efficiently and thus cannot be employed for optically active or optoelectronic applicati…
Optical and time-resolved EPR(TREPR) studies were made on the excited states of fluorine-substituted magnesium tetraphenylporphines (MgF−TPPs) including related Mg porphyrins. From the analyses of TREPR spectra it was found that the zero-field splitting parameter, D, increased with an increasing number of substituents…
In this paper we shall be interested in establishing existence of certain equilibria of the Cahn-Hiliard equation. 20 refs.
It has been mentioned that nitrogen enhances the corrosion resistance of the martensitic stainless steels. In this work, by means of electrochemical and mass loss tests, the corrosion resistance of three experimental martensitic stainless steels, with partial substitution of carbon by nitrogen were investigated. Marte…
The structures of ten related oxypregnane-oligoglycosides stephanosides A (1), B (2), C (3), D (4), E (5), F(6), G (7), H (8), I (9), and J (10) from the fresh stem of Stephanotis lutchuensis var. japonica (Asclepiadaceae)were elucidated on the basis of a detailed study of their high-field 1H- and 13C-NMR spectra. All…
The thermal decomposition of NF 3 by various oxides was investigated using gas chromatography, BET surface areas, and X-ray powder diffraction. The decomposition of NF 3 using alumina can occur at temperatures as low as 100 °C, with steady complete conversion for almost 4 h at 400 °C. The reaction is shown to be stoic…
Image-processing techniques for measuring the fibre-orientation distribution in a nonwoven fabric are described. The digitised image of the surface of a fabric is progressively simplified by a line operator and edge-smoothing and thinning operations to produce an image in which fibres are represented by curves of one…
NO selective reduction by CH4 over Ga2O3 catalysts is a structure-sensitive reaction depending on the local structure of Ga2O3; low-coordinate Ga ions are responsible for higher activity.
Configuration interaction (CI) spaces obtained from the full CI space by imposing arbitrary restrictions on the occupancies of molecular orbital (MO) groups are studied. It is proved that such restricted spaces are in a certain sense “closed.” Namely, in the course of the Hamiltonian matrix construction the excitation…