CONTRIBUTION A L'ÉTUDE DES COPÉPODES HARPACTICOÏDES DE MÉDITERRANÉE OCCIDENTALE: 2. TACHIDIIDAE Sars, Lang.
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Landau's Theory of Second‐Order Phase Transitions and the Magnetic Phase Transitions in Some Antiferromagnetic Oxides
Abstract It is argued that many magnetic phase transitions are not, according to Landau's theory, strictly second‐order phase transitions. A detailed discussion of the application of Landau's theory of second‐order phase transitions to antiferromagnetic UO 2 , MnO, FeO, CoO, and NiO is given in terms of Jahn‐Teller di…
Effect of bath temperature on the chemical bath deposition of PbSe thin films
PbSe thin films are prepared by chemical bath deposition technique over microscope glass substrates from an aqueous acidic bath containing lead nitrate and sodium selenate. The influence of bath temperature on the properties of PbSe film is investigated. The X-ray diffraction analysis showed the deposited films were p…
Photoisomerization of 2-cyanopyrrole
Irradiation of 2-cyanopyrrole in methanol yields 3-cyanopyrrole as a major photo-product; this is believed to be the first example of the 2–3 valance isomerization of pyrroles.
Molecular nitrogen as a ligand
Abstract
<i>In vitro</i> antibacterial activity of shrimp chitosan against <i>Salmonela paratyphi</i> and <i>Staphylococcus aureus</i>
Antimicrobial properties of chitosan extracted from indigenous shrimp processing waste were determined against one gram-negative (Salmonella Paratyphi) and one gram-positive bacterium (Staphylococcus aureus) in vitro. The antimicrobial activities of chitosan were explored by calculation of the Minimum Inhibitory Conce…
Crystal and molecular structure of hexaiodobenzene
The structure of hexaiodobenzene has been elucidated by an X-ray study based on photographic data. The crystals are monoclinic pseudo-hexagonal, space group P21/n, which here requires the C6I6 unit to be centrosymmetric. Within experimental error the carbon skeleton is a regular planar hexagon with mean C–C distance 1…
Thermal Conductivity of Ceramic Solid Solutions
The thermal conductivity of ThO2-UO2 and ThO2-CeO2 systems were measured by laser flash method, and the results are discussed with the aid of the relaxation-time theory. Two parameters characteristic to systems of the same base — the ratio α of scattering rates between N- and U-scatterings and the strain parameter ϵ—…
Thermal Expansion Coefficient of Fe-Ni (<I>fcc</I>) Alloys
The thermal expansion coefficient α was measured over the temperature range from 800°C to room temperature for Fe-Ni (fcc) alloys. The results obtained are as follows: (1) On the temperature vs. α curve, a peak appears at the Curie temperature Tc of the alloys in the composition range above about 42%Ni but disappears…
Ligand-field splittings in non-cubic complexes. Part III. Tetragonal copper( II )–oxygen systems
The d–d spectra of tetragonal copper(II)–oxygen systems are discussed. The position of the transition dz2→dx2–y2 in eight compounds can be accounted for in terms of σ-bonding and electrostatic effects. The other two transitions are less readily treated since they are affected by π-bonding. However, the d orbital split…
STUDIES ON HETEROGENEITY OF FILLED RUBBER SYSTEMS
カーボンブラック系加硫ゴムについて, パルスNMR法によりカーボンブラック周辺に形成される稠密構造 (C相), およびカーボンブラック周辺から離れた部分 (A相) のゴム分子鎖達の分子運動性とその成分量を解析し, 分子運動性の状態から見た構造を, 純ゴム, プラスチックと比較すると同時に, 力学的刺激による構造 (状態) 変化と, それに関する過去の実験結果を整理し、次のような結果を得た.1. カーボンブラック系加硫ゴムは準ガラス状態の相 (C相) と液体の相 (A相) とよりなり, 前者はNMR半値幅で約5gaussで, その相のゴム分子鎖達の運動は非運動性であり, 層の厚さは充てん剤の補強性により異なるが, ISAF級で約45…
Nickel(II), cobalt(II), and copper(II) complexes with N-methyl-p-nitroso-aniline and p-nitrosoaniline
Transition-metal ion complexes with the ligands p-nitrosoaniline and N-methyl-p-nitrosoaniline have been prepared and studied. I.r. spectra, solution and mull visible spectra, magnetic moments, and molar conductances are reported. I.r. and n.m.r. evidence is presented for the presence of an equilibrium mixture of nitr…
Oxygen Diffusion in Monoclinic Zirconia
Oxygen‐18 enriched oxygen and carbon dioxide‐carbon monoxide atmospheres have been used in the determination of the oxygen self‐diffusion coefficient in monoclinic zirconia at 990 °C. Oxygen exchange measurements were made on zirconia spheres in the average size ranges of 90 and 126µ. The diffusion coefficient was fou…
New Data on Basic Lead Sulfates
High‐temperature x‐ray and DTA investigations of the lead oxide‐lead sulfate system confirmed the phase relations established by Esdayle and Lander. In order to elucidate discrepancies in the literature and to insure positive identification of the three basic lead sulfates , , and , single crystals were prepared and i…
Thermal stability of structurally related polymers containing carborane and phthalocyanine groups
Abstract These studies were undertaken to determine the thermal behavior of structurally related polymers having a carborane nucleus in the recurring unit. Three of these products also contained phthalocyanine rings in their molecules. Results of thermal analysis studies show generally that the relative heat stability…
Nucleation efficiency in lithia-alumina-silica glasses
The efficiency of TiO2 as a nucleating agent in the Li2O—Al2O3—SiO2 system is explored over a wide composition range. Sharp changes in crystal growth rate, which strongly influence nucleation rate, are observed near the Li2O·Al2O3—SiO2 composition line and are ascribed to changes in fluidity of the glass at the crysta…
Dental Silicate Cements: IX. Decomposition of the Powder
The initial phase of the reaction between powder and liquid has been investigated. Electrophilic attack by protons in the liquid results in the decomposition of the powdered glass with liberation of cations and fluoride ions. The extent of the attack depends on the degree of acidity of the liquid.
N-methylation of octaethylporphyrin and octaethylchlorin
Methyl fluorosulphonate N-methylates octaethylporphyrin and octaethylchlorin to give, depending upon the reaction conditions, N-methyloctaethylporphyrin, two NN′-dimethylporphins, NN′N″-trimethylocataethylporphin, and an N-methyloctaethylchlorin.
Insertion reactions of titanium alkoxides with isocyanates and carbodiimides
Titanium alkoxides react readily and reversibly with isocyanates by insertion into the Ti–O bond to form mono-, di-, tri-, or tetra-N-titano-urethanes. With titanium aryloxides the reaction is much slower and irreversible. Carbodiimides react in a similar manner to give only the di-substituted-N-titanoisoureas. The re…
A Theory of the Lattice Vibration of Anharmonic Solids
The lattice vibration of anharmonic or “non-ideal” solids is studied using a method of double-time Green's function, without assuming the smallness of the anharmonicity of atomic vibrations from the outset. To encompass disordered and amorphous solids and molecular systems as well, a system under consideration is take…