Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Copper (Cu) phytotoxicity is closely related to pH and Cu activity in solution. The effect of pH on growth and uptake of Cu by Swingle citrumelo rootstock seedlings were investigated in solution culture with varying Cu activities. Copper activities of either 0.05, 0.5, 5, and 10 μM at pH 5 and 6 were maintained by add…
Electrochemical techniques, ellipsometry and x‐ray photoelectron spectroscopy were used to evaluate the use of benzotriazole, alone or in combination with boric acid/borate buffer and dilute copper sulfate for the protection of cobalt. The data indicate that in slightly alkaline solutions benzotriazole is a strong inh…
A recursive integral equation for the intramolecular correlation function of an isolated linear polymer of N bonds is derived from the integral equations presented in the preceding paper. The derivation basically involves limiting the density of the polymer to zero so that polymers do not interact with each other, and…
A study was conducted of the temperature dependence of the thermal diffusivity and thermal expansion of an alumina–aluminum titanate composite heated to a range of maximum temperatures followed by cooling to room temperature. Heating to temperatures above about 600°C resulted in a hysteresis behavior in which the data…
Abstract The hydrosilation of α,ω‐dihydrogen functional oligopolydimethylsiloxanes with epoxy compounds containing vinyl groups has been found to take place regioselectively in such a manner that compounds can be isolated in high yields in which only one SiH group has been reacted. Three different α,ω‐dihydrogen func…
The mesomorphic properties of 3,4,10,11,17,18,24,25-octaalkyloxy and octaalkanoyloxycyclotetraveratrylene (orthocyclophane) have been investigated by differential scanning calorimetry (DSC), polarizing optical microscopy, NMR and X-ray diffraction. Twelve homologues of the octaalkyloxy series, with equal side chains c…
Cellulose colonization by Clostridium cellulolyticum was studied by using [methyl-H]thymidine incorporation. The colonization process indicated that a part of the bacterial population was released from cellulose to the liquid phase before binding and colonizing another adhesion site of the cellulose. We postulate that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe apparent "dual emitter" characteristics of iridium bipyridine phenanthroline complexes, [Ir(bpy)x(phen)3-x]3+ for x = 1,2Elmars Krausz, John Higgins, and Hans RiesenCite this: Inorg. Chem. 1993, 32, 19, 4053–4056Publication Date (Print):September 1, 1993Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkanesulfonation of cyclic and high polymeric phosphazenesHarry R. Allcock, Erick H. Klingenberg, and Mark F. WelkerCite this: Macromolecules 1993, 26, 20, 5512–5519Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 S…
Cell-free extracts of Thiobacillus acidophilus catalysed the stoichiometric conversion of tetrathionate to thiosulphate, sulphur and two protons. The pH optimum of the enzyme activity was 3.0 and its temperature optimum 40°C. The enzyme was unstable at 30 and 40°C, at which its activity decreased to zero within 100 an…
Abstract Generally, fracture toughness and fracture stress of ceramics depend on crack length, notch root radius and grain size. These three parameters are most important when assessing the integrity of structural ceramic members and developing high‐performance ceramics. A new failure criterion called the process zone…
SUMMARY: Accumulation of Cs+ by Chlorella salina was 28-fold greater in cells incubated in the presence than in the absence of 0.5 M-NaCl. An approximate 70% removal of external Cs+ resulted after 15 h incubation of cells with 50 μ;M-CsCl and 0.5 M-NaCl. LiCl also had a stimulatory effect on Cs+ uptake, although manni…
Castor oil is a relatively inexpensive and renewable source of hydroxyl groups. This makes use of castor oil in polyols for polyurethane very attractive. We have prepared a simple castor oil based polyol for rigid polyurethane foam application. The polyol is a physical blend of castor oil and glycerol. Glycerol acts a…
Abstract Measurements on polyaniline using dielectric analysis (DEA, −50°C to 240°C, 0,4 Hz to 10 5 Hz), differential scanning calorimetry (DSC, 30°C to 240°C) and infrared spectroscopy (IR) after heat treatment from 25°C to 300°C are carried out. After conversion of DEA results to complex electric modulus, the conduc…
Abstract Samples of paracyanogen were prepared by the pyrolysis of silver cyanide, the photolysis of cyanogen, and by sputtering a carbon electrode in a nitrogen plasma. This work was undertaken to establish whether these materials are alike and to derive structural information on the basis of FT‐IR, 13 C‐MAS—NMR, and…
In this work we use transmission electron microscopy to identify extended lattice defects which result from O + ion implantation at a dose of 1.3×10 15 /cm 2 into Sn-doped In 2 O 3 at room temperature. Measurement of the resistivity, mobility, carrier density, and transmissivity to visible light as a function of impla…
To eliminate the heat loss effects in thermal diffusivity measurements using the ac calorimetric method, it is proposed theoretically that simultaneous measurement of the effective thermal diffusivities from both the amplitude decay of the ac temperature waves propagating along the surface of a thin sample and its pha…
En raison de la nature particulière des cours d'eau de son bassin, l'Agence de l'Eau Artois-Picardie a adopté en 1988 les diatomées et les indices diatomiques pour l'estimation de la qualité biologique de l'eau. Six indices ont été testés. Les résultats montrent que l'IPS ou Indice de Polluosensibilité Spécifique (Cos…
Magnetic ordering phenomena in mixed-metal assemblies {NBu4[Fe(II)M(III)(ox)3]}3∞ (M=Cr (1), Fe (2)) were studied by using 57Fe Moessbauer spectroscopy, where NBu4 +=tetra(n-butyl)ammonium ion, ox2-=oxalate ion. Nuclear Zeeman splittings were observed in the Moessbauer spectra of both 1 and 2 at low temperatures (belo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTClusters of clusters. 25. Synthesis and structure of a new [gold-silver]-38-metal-atom cluster [(Ph3P)14Au18Ag20Cl12]Cl2 and its implications with regard to intracavity chemistry on metal cluster surfacesBoon K. Teo, Xiaobo Shi, and Hong ZhangCite this: Inorg. Chem. 1993, 32…