Materials Literature
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The crystal structure of [AsPh4] [TcNBr4] has been determined by single- crystal X-ray diffraction methods at 20±1°C. Crystals are tetragonal, space group P4/n, with a 12.875(2), c 7.992(1)?, and Z 2. Full-matrix least-squares refinement gave a final R value of 0.039 for 1263 independent reflections. The compound is i…
Abstract Die Sulfide Ba 3 CdSn 2 S 8 (A) und Ba 6 CdAg 2 Sn 4 S 16 (B) wurden erstmals dargestellt und die Kristallstruktur mit Einkristalldaten von (A) bestimmt. (A) und (B) sind isotyp und kristallisieren in der Raumgruppe I 4 3d‐T (Nr. 220) mit a = 14,7235 ± 0,0007 (Z = 8) für (A) und a = 14,7253 ± 0,0007 Å (Z = 4)…
A variety of 2, 7-disubstituted fluorenes has been synthesised including 2-alkyl-7-cyanofluorenes, 2-pentyl-7-fluorenyl esters and esters of 7-pentyl-2-fluorenecarboxylic acid. Transition temperatures have been determined and are compared with those of analogous biphenyl compounds: it is found that the melting points…
Major advances in recent studies of defects in MCT are reviewed, including our current understanding of defect formation mechanisms, dynamics, and their electronic properties. New attempts to control the defects are also discussed. Several key technical issues are raised which should serve as guidelines for future res…
General perturbation theoretical arguments are given for the opposite effect of small positive and negative charge transfer on the geometry of solids. Applications to π-conductors, such as intercalated graphites and doped polyacetylenes, indicate C-C bond elongation for donor compounds and shortning for acceptor compo…
Abstract Processes for lowering NO x emissions in flue gases . The authors survey processes currently under development for reducing NO x emission levels of combustion units. Primary measures, i.e. acting upon the combustion process itself, do not suffice to meet the recently stiffened limiting emission values; partic…
The diameters of Dow latex particles in the size range from 0.085 to 0.330 μm were determined by electron microscopy. The effects of electron irradiation and the vacuum conditions in the microscope on the measured particle diameter were investigated. A comparison among latex samples was also made. The results confirme…
In order to determine the stremes in high voltage DC cable accessering containing a combination of Voltalit (a proprietary epoxy Insulation), SF4 and paper/oil inxulation, a knowledge of the surface and bulk conductivily of the Voltalit is required. It ii also necessary to determine the coefficient govering the depend…
Creep experiments have been carried out on single crystals of Fe2SiO4 and Co2SiO4. The crystals were internally buffered by oxide precipitates against FeO and SiO2, respectively. The following flow laws were obtained: for internally buffered fayalite, ε = 1·7 × 1022σ6±1 pgO Oexp(-923±220kJmoL−1 RT), and for internally…
To investigate the fatigue behavior of cyclically softening and hardening steels under multiaxial elastic-plastic strains, axial strain, and shear strain controlled fatigue tests under constant amplitude loading were carried out. S-N curves under axial strain and torsional pure shear as well as under combined axial st…
The transfer of fibres is of interest in the investigation of many crimes. In an effort to assess the likelihood or frequency of transfer of automobile carpeting fibres, simulated transfers were carried out in vehicles with several fabric types. Factors which influence fibre transfer were tested, including pressure of…
Abstract The proton‐decoupled signal of methyl carbons of O ‐(2‐hydroxypropyl)cellulose (HPC) ( 1b , m ≥ 1) was found to be split into two peaks. The results of experiments on lanthanide shift and the dependence of the relative intensities of both peaks on the molecular weight of poly(oxypropylene) [poly(propylene oxi…
Abstract Fouling of heat transfer surfaces . Fouling of heat transfer surfaces in industry causes considerable costs. Overcoming fouling is therefore essential for technical and economic reasons. Solution of the problems requires a better understanding of the physical, chemical and biological processes causing fouling…
Structural deformations of a nematic-isotropic interface induced by magnetic field have been predicted some years ago by de Gennes. In this paper we extend the de Gennes' theory in order to account for the finite anchoring energy of the director at the interface, for the anisotropy of the elastic constants K11 and K33…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultinuclear magnetic resonance study of tri(cyclopentadienyl)scandium: a fluxional dimer with bridging cyclopentadienyl groupsPeter Bougeard, Mary Mancini, Brian G. Sayer, and Michael J. McGlincheyCite this: Inorg. Chem. 1985, 24, 1, 93–95Publication Date (Print):January 1,…
The molar absorption coefficients for the OH stretching vibrations of 16 hydrothermally prepared hydroxyfluorapatites Ca5(PO4)3(OH)xF1-x have been determined. The coefficients vary with composition, reaching a maximum at x = 0.8. At low OH concentrations, such as they are typical for most natural fluorapatites, the ab…
The electric field-induced deformations of a planar nematic(N)-isotropic(I) interface were studied, using a surface-nucleated N film prepared in a usual sandwich-type cell. When the applied AC voltage (10 Hz-100 kHz) was small, a uniform elastic distortion of the director was observed. But. at higher voltages, the pla…
A series of sterically hindered manganese porphyrins have been used to catalyse shape-selective alkane hydroxylation, Increasing the production of primary alcohols.
各種の微小欠陥を付加したSi3N4とSiCの強度試験を行うとともに, 他の実験結果も併せて整理し, 欠陥寸法, 切欠き半径と強度の関係を求めた. その結果, 実際の機械部品で対象とするような100μm程度以下の微小な欠陥では, 破壊靱性値KICを一定とする線形破壊力学による評価結果は非安全側を与え, この傾向は結晶粒径の大きい材料ほど大であることが明らかとなった. 表面加工傷, 空孔, 人工欠陥等の各種の欠陥についての実験結果は, その形状効果を補正した等価き裂長さを用いることによって, 欠陥寸法と強度の関係は同一に取り扱うことができた. また, 各種セラミックスについての強度試験結果を, 等価き裂長さと平均結晶粒径の比ae/dと…
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