Materials Literature
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An experimental investigation of the sedimentation of monodisperse colloidal silica spheres with grafted octadecyl chains with three different interaction potentials is presented. Small particles (0.27 μm) behaved as hard spheres in cyclohexane, but larger ones (0.60 and 0.94 μm) are weakly flocculated by van der Waal…
Surfactant (BL86) was isolated from foam produced during growth ofBacillus licheniformis 86 by acid-precipitation followed by extraction into tetrahydrofuran or methanol. The surfactant is anionic and dissolves in tetrahydrofuran, methanol, chloroform, dichloromethane, xylene, toluene, and alkaline water. The surfacta…
Acetoacetate decarboxylase (ADC) (EC4.1.1.4) of Clostridium acetobutylicum DSM 792 was purified to homogeneity, and its first 25 N-terminal amino acids were determined. Oligonucleotide probes deduced from this sequence were used to detect positive clones in partial gene banks derived from Sau3A and HaeIII digests with…
We calculate first-retardation and multipole corrections to the dipole angular distributions of L-shell photoelectrons ejected by polarized photons. The calculation is performed nonrelativistically in the framework of the independent-particle model. It leads to general expressions for the s and p subshell retardation…
We use modulated molecular beam relaxation spectroscopy (MMBRS) to identify the sequence of elementary reaction steps and to quantify the rate parameters for catalytic water (D2O) formation on Pt(111). This investigation is restricted to surface temperatures in the range 373 ⩽ TS ⩽ 723 K and oxygen and deuterium press…
Abstract For the use of published general or theoretical sensitivity factors in quantitative AES and XPS, the energy dependence of both the spectrometer transmission function and the detector sensitivity must be known. Here, we develop simple procedures that allow these dependencies to be determined experimentally. De…
Abstract Radiolytic reduction of AgClO 4 solutions containing a polyanion leads to the formation of long‐lived oligomeric silver clusters which are stabilized on the polymer chains. Under suitable conditions, the accompanying formation of colloidal silver consisting of metallic particles is strongly suppressed and clu…
Describes the realization and use of a modern electron spectrometer. The discussion includes practical guidelines accessible to non-specialists who wish to design their own instrument. The basic characteristics and the design principles of such devices are discussed, with emphasis on the key component: the energy anal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of quinone-substituted octaalkyl porphyrin monomers and dimersJonathan L. Sessler, Martin R. Johnson, Stephen E. Creager, James C. Fettinger, and James A. IbersCite this: J. Am. Chem. Soc. 1990, 112, 25, 9310–9329Publication Date (Print):Decemb…
A density-functional theory of nonuniform fluid mixtures---based on a generalization of the one-component weighted-density approximation---is both presented and applied to freezing transitions in binary mixtures of hard spheres. A necessary step in this application is the specification of the crystal structure of the…
A single-crystal X-ray structure analysis of decagonal Al65Cu20Co15 has been performed using the n-dimensional approach. Five-dimensional space group P10(5)/mmc, a(i)* = 0.2656 (2), a5* = 0.24107 (3)-angstrom-1, d(i) = 3.368 (1), d5 = 4.1481 (3)-angstrom, alpha-ij = 60, alpha-i5 = 90-degrees (i, j = 1,..,4), volume of…
Pearls and Pitfalls in Electrocardiography: Pithy Practical Pointers , Pearls and Pitfalls in Electrocardiography: Pithy Practical Pointers , کتابخانه الکترونیک و دیجیتال - آذرسا
Abstract Carbon electrodes impregnated with three different pitches have been studied and compared. The electrode samples were heated up to 893 K in a thermogravimetric analyser at different heating rates. The weight loss was recorded with respect to time and temperature. A special technique and a calculation procedur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSynthesis, electronic structure, and reactivity of metallacyclotetraazapentadienes.William C. TroglerCite this: Acc. Chem. Res. 1990, 23, 12, 426–431Publication Date (Print):December 1, 1990Publication History Published online1 May 2002Published inissue 1 December 1990https://pu…
The case of a surface plasmon-polariton (excited by transverse magnetic light) propagating at the interface between an isotropic metal (silver) and an anisotropic (uniaxial) substrate is considered. The field distribution within the system is illustrated when the optic axis of the substrate is not orthogonal in the pl…
Polyvinylchloride (PVC) is a common thermoplastic and one which often contains plasticizers. The most important plasticizer is di-2-ethylhexylphthalate (DEHP). Hygienic conditions in the PVC processing industry were surveyed by measuring the air concentrations of hydrogen chloride, DEHP and phthalic anhydride (PA) in…
The structural features and fracture morphology of raw and chemically treated pineapple leaf fiber have been studied using scanning electron microscopy. Pineapple leaf has a multicellular structure, and alkali treatment clearly reveals the ultimate fibers. Surface morphology progressively changes with gradual removal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEntanglement and the molecular weight dependence of polymer glass transition temperatureY. H. LinCite this: Macromolecules 1990, 23, 25, 5292–5294Publication Date (Print):December 1, 1990Publication History Published online1 May 2002Published inissue 1 December 1990https://p…
New data are given for algodonite (formula), awaruite (formula, space group), billingsleyite (space group, unit cell), bogdanovite (formula, space group), hexatestibiopanickelite (formula), keithconnire (formula), mgriite (formula), polarite (formula), roaldite (space group), sobolevskite (space groups, unit cells), s…
Abstract High amplitude, split-Hopkinson pressure bar (SHPB) laboratory tests were conducted on compacted specimens of 50/80 silica sand to evaluate the influence of saturation on compressional-stress wave velocity, stress transmission, and attenuation. Stress wave velocity and transmitted stress increase as the satur…