X-ray diffraction studies on the structures of cadmium iodide complexes in water and in DMSO solutions
Abstract
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Optical activity of rare earth crystals. Europium oxydiacetate
The circular dichroism (c.d.) spectra corresponding to 7F0→5D1.2 and 7F1→5D0,1,2 transitions of the europium oxydiacetate crystal are reported. The electric dipole and magnetic dipole contributions to the total transition moment are separated for the principally magnetic dipole allowed 7F0→5D1 transition as well as fo…
Assessing the resistance of polymers to electrical treeing
The susceptibility of polymeric insulating materials to breakdown by ‘treeing’ has impeded their utilisation as insulation for high voltage cables. This review surveys the results of tests used to investigate tree initiation and propagation and discusses factors which affect the resistance of materials to breakdown by…
Stärke als Chemierohstoff — Möglichkeiten und Grenzen
Abstract Bei den Bemühungen um die Erschließung neuer, regenerierbarer Rohstoffquellen für die Chemie kann die Stärke eine besondere Rolle insofern spielen, als sie als natürliches Polymeres durch Konversion und Modifizierung den Anforderungen, die sich aus einer Verwendung als Rohstoff oder Zwischenprodukt biotechnis…
An Algorithm for Electron Depth-Dose Distributions in Multilayer Slab Absorbers
An algorithm to evaluate depth-dose distributions produced by plane-parallel electron beams normally incident on two- or three-layer slab absorbers has been developed. It is based on a simple model of electron penetration across the interface, and makes use of empirical equations previously formulated as well as ones…
Liquid phase oxidation of cyclo-olefins by a PdSO 4 –heteropolyacid catalyst system
By a PdSO4–heteropolyacid(H3PMo6W6O40)catalyst system in the liquide phase cyclo-olefins, particularly cyclopentene and cyclohexene, are oxidized to the corresponding ketones.
Structure of Mn–EDTA 2– complex in aqueous solution by relaxation nuclear magnetic resonance
A comprehensive analysis is given for water proton relaxation rates, T–11. and T–12, measured in solutions of Mn–EDTA2–. Protons of water molecules hydrogen-bonded to co-ordinating carboxylate oxygen atoms of EDTA make a significant contribution to overall relaxation rates. After allowing for these secondary solvation…
Deformation Behaviour of Ni–Al L1<SUB>0</SUB> (3R) Martensite
Deformation behaviour of L10(3R) type Ni–Al martensite was observed by tensile testing, optical-and electron-microscopy and X-ray diffraction. When the specimen initially consisting of four pairs of internally twinned L10 variants is pulled along a 〈001〉β1 axis of the mother phase, it becomes a single crystal of L10 m…
Microscopic Process of Failure and Mechanism of Hydrogen Embrittlement of Iron
The microscopic process of void formation and propagation has been investigated in hydrogen embrittlement of iron. Specimens of pure iron in bamboo structure as well as polycrystalline specimens were tested in tension under cathodic hydrogen charging in 3%NaCl aq. at a current density of 100 A/m2. Origins of fractogra…
Formation of AlN polytype ceramics and some of their properties.
Formation of 27 R-AlN polytype ceramics and their mechanical properties were investigated in the typical composition of the AlN-SiO2. Densified 27 R-AlN polytype ceramics consisted of plate like grains without low temperature melting compounds at grain-boundaries were obtained by 2000°C presintering and subsequent 210…
Electric Permittivities and Elastic Constants of the Cyano Bi-Cyclohexanes (CCH)
Measurements of the electric permittivities and the splay and bend elastic constants of the cyano bicyclohexanes (CCH) are reported as a function of temperature. Comparison of the ratio of the bend to splay constants with that of analogous compounds containing phenyl rings shows unexpected trends, and attention is dra…
Preparation and spectroscopic properties of pure tetrabenzoporphyrins
Cadmium tetrabenzoporphyrin, tetrabenzoporphyrin, and the bispyridine complex of magnesium tetrabenzoporphyrin were synthesized. As judged from the visible absorption spectra these compounds are not contaminated with porphyrin-like impurities. 100-MHz 1H Fourier-transform n.m.r. spectra of the above mentioned compound…
Landau description of the calcite-CaCO3(II) phase transition
The calcite-CaC${\mathrm{O}}_{3}$(II) phase transition is described within the framework of the Landau criteria for continuous phase transitions. The $\stackrel{\ensuremath{\rightarrow}}{\mathrm{F}}$ point is chosen to construct the irreducible representation driving the transition. All Landau conditions are satisfied…
Effects of Iron on the Corrosion Resistance of Titanium
This paper presents the results of extensive laboratory tests and experience in industrial applications to explain the effects of iron on the corrosion resistance of titanium. In the great majority of cases where titanium is being used in corrosive environments, the effect of iron at the levels normally found in unall…
Comparison of the noise of different electron detection systems using a scintillator‐photomultiplier combination
Porcine tracheal and bronchial explant cultures exposed to log-phase cultures of Bordetella, Candida, Corynebacterium, Haemophilus, Klebsiella, Mycoplasma, Pasteurella, Proteus, Saccharomyces, Staphylococcus and Streptococcus were examined for surface sequential changes by scanning electron and light microscopy. Infec…
Synthesis and Characterization of (Methylhyinoxypenyl)-tellurium(IV) Halides
The preparation and properties of some (methylhydroxyphenyl)tellurium(IV) halides, RnTex4-n, (where R = CH3C6H3OH, X = Cl, Br, I, and n = 1,2,3), are reported. Cryoscopic measurements, in general, are consistent with conductivity measurements and reflect the molecular nature of RTeCl3 and R2TeX2, and the ionic nature…
Mechanistic Aspects of Phosphorus-Nitrogen Synergism in Cotton Flame Retardancy
N,N',N"-Triethyl phosphoratriamide and ethyl,N,N'diethyl phosphoradiamidate are not able to phosphorylate cellulose even at 160°C. The increased efficacy of these reagents as flame retardants for cotton has been proposed due to the formation of intermediates containing -P=N grouping by loss of an amine molecule from t…
Characterization of 2,2′-bi-(1,4,8,11-tetra-azacyclotetradecane): X-ray structure and properties of the dinuclear complex [Ni 2 (C 20 H 46 N 8 )][ClO 4 ] 4
2,2′-Bi-(1,4,8,11-tetra-azacyclotetradecane) has been isolated as a minor product from the nickel (II)-assisted synthesis of 1,4,8,11-tetra-azacyclotetradecane (cyclam) and its structure confirmed by X-ray structural analysis of the dinuclear complex [Ni2(C20H46N8)][ClO4]4.
Transition-metal Complexes of Pyrrole Pigments. XVII. Preparation and Spectroscopic Properties of Corrole Complexes
Abstract Nickel(II), copper(II), and cobalt(III) complexes were prepared with corroles; 2,3,7,8,12,13,17,18-octaethylcorrole (OEC), 2,3,17,18-tetramethyl-7,8,12,13-tetraethylcorrole (MEC), and 8,12-bis[2-(ethoxycarbonyl)ethyl]2,3,7,13,17,18-hexamethylcorrole (PMC). For the coordination with nickel and copper ions, the…
Anisotropie des transitions interbandes dans le nitrure de bore hexagonal
Les fonctions diélectriques ordinaires et extraordinaires du nitrure de bore hexagonal ont été calculées à partir de mesures multi-angle du pouvoir réflecteur pour une énergie de rayonnement de 5 eV à 30 eV. Les spectres obtenus sont discutés en termes de transitions interbandes.