Materials Literature
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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…
Abstract
An adult female thermally instrumented mannequin was designed and constructed for apparel flammability research at the University of Minnesota. Forty-four chromel-alumel thermocouples (0.13 mm diameter) were encased in Pyrex, with measuring junctions exposed, and installed to measure surface temperatures during garmen…
The synthesis of three macrocyclic hosts containing convergent hydroxy groups is described; the cyclisation step is performed by using a ‘covalent template’ with boron.
NdAlGe 2 O 7 and NdGaGe 2 O 7 crystallize in space group P 2 1 / c with a = 7.204(1), [7.208(1)] Å; b = 6.519(1), [6.603(1)] Å; c = 12.700(1), [12.823(1)] Å; β = 117.4(2)°, [117.4(2)°] and Z = 4. The structures have been determined from single crystal X-ray data. The final R -values are 0.0638 and 0.0231. In both stru…
On montre la relation entre les proprietes elastomeriques importantes et les domaines definis de temperature du facteur de perte mecanique. On en tire une relation de temperature ideale avec les proprietes viscoelastiques de caoutchoucs pour bandes de roulement. On prepare des polydienes a structure variee en presence…
Oligomeric complexes of tetrathio-oxalate with NiII, CuII, and PdII have been synthesized to yield materials having high electrical conductivities of up to 20 S cm–1.
A new technique has been developed to study and control hydrogen storage in solid metal hydrides. The formation of metal hydrides and their thermodynamic and kinetic properties have been investigated by electrochemical methods employing a low temperature molten salt galvanic cell of the type The choice of the electrol…
An optical model is considered describing a wide class of optically anisotropic media such as chiral smectic liquid crystals and, in the limiting cases, cholesteric liquid crystals and anisotropic homogeneous media. It describes a structure having a periodicity along a given axis generated by a uniform rotation of the…
Three water-soluble square-planar nickel complexes have been investigated as quenchers of 1O2 in aqueous solution, using anthracene-9,10-bis(ethanesulphonate) as a trap. Disodium [NN′-ethylenebis(5-sulphosalicylideneiminato)] nickelate(II) and its propylene analogue are efficient quenchers, with kQ= 1.6 × 109 and 1.3…
Fig. 2 (a) Surface relief of martensite induced by bending at 77K in 25% ausformed specimen of Fe-3 1Ni-0.4C. (b) Identical area to (a) after heating to 550K .
Abstract Platinum(III) is no longer an uncommon oxidation state. Numerous binuclear platinum(III) complexes have been prepared and structurally characterized over the past eight years. These include sulfate‐bridged dimers of D 4 h symmetry, [Pt 2 (SO 4 ) 4 L 2 ] 2− , L = H 2 O, DMSO; phosphate‐bridged complexes [Pt 2…
Insulin has been encapsulated in biodegradable polylactic acid microcapsules and non-biodegradable ethylcellulose microcapsules by using an emulsification-solvent evaporation process. Gelatin and polyvinylalcohol were used as protective colloids. The concentrations and types of protective colloids affecting the microm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms of epoxidation during ozonation of carbon-carbon double bondsPhilip S. Bailey, Hank H. Hwang, and Chin Yun ChiangCite this: J. Org. Chem. 1985, 50, 2, 231–234Publication Date (Print):January 1, 1985Publication History Published online1 May 2002Published inissue 1…