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。
Etude de deux series de verre du systeme ternaire Na 2 O-Al 2 O 3 -SiO 2 . Dans la premiere serie, le long du joint Na 2 O-SiO 2 , Na entre dans la masse fondue comme cation modificateur provoquant la formation d'oxygenes non pontes et la depolymerisation progressive de la structure. La seconde serie est liee au joint…
Supported and unsupported γ-Al2O3 and TiO2 ceramic membranes have been prepared by sol-gel techniques from alkoxide precursors. Several physico-chemical properties of these materials have been determined. N2 sorption analysis has been used to determine pore size distributions and mean pore sizes. Particle sizes of sol…
The Enzyme IIfru of the phosphoenolpyruvate- (PEP-) dependent phosphotransferase system (PTS), which catalyses the uptake of fructose and its concomitant phosphorylation to fructose 1-phosphate by Escherichia coli, is specified by a gene designated fruA. The nucleotide sequence of a 2.5 kb PvuII restriction fragment s…
ABSTRACT Growth of Aspergillus flavus and Penicillium notatum was inhibited by a fungicide coupled to a packaging film. A chemical method was employed to attach a fungicide containing amino groups to an ionomeric packaging film containing pendent carboxyl groups. Dicyclohexylcarbodiimide was used as the coupling agent…
The electrodeposition of polythiophene films has been monitored ellipsometrically. The species that are generated immediately after application of the polymerization potential form in solution near the electrode. Deposition of material on the electrode commences a short time later, in agreement with the point at which…
Article SCHLEGEL projections and SCHLEGEL diagrams - new ways to describe and discuss solid state compounds was published on October 1, 1988 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 183, issue 1-4).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray structures of cubylcubane and 2-tert-butylcubylcubane: short cage-cage bondsRichard. Gilardi, Michele. Maggini, and Philip E. EatonCite this: J. Am. Chem. Soc. 1988, 110, 21, 7232–7234Publication Date (Print):October 1, 1988Publication History Published online1 May 200…
A series of special polyimides was synthesized to use them for aligning nematic liquid crystals accompanying a pretilt angle from a few degrees up to 30 degrees by using a rubbing technique. The chemically synthesized polyimide is comprised of two parts: one is an ordinary long-chain polymer and the other is an extra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimeric versus monomeric titanium(III) siloxide complexes. Syntheses and characterization of [(c-C6H11)7(Si7O12)TiIII]2 and [(c-C6H11)7(Si7O12)TiIII(C5H5N)]2Frank J. Feher, Shirley L. Gonzales, and Joseph W. ZillerCite this: Inorg. Chem. 1988, 27, 20, 3440–3442Publication Da…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntercomparisons of dielectric relaxation, dynamic light scattering, and viscoelastic properties of the local segmental motion in amorphous polymersK. L. Ngai, S. Mashimo, and G. FytasCite this: Macromolecules 1988, 21, 10, 3030–3038Publication Date (Print):October 1, 1988Pu…
In inner-shell photoionization of an atom followed by Auger decay, the Auger electron initially screens the ionic Coulomb field experienced by the photoelectron. A sudden change in screening occurs when the Auger electron overtakes the photoelectron, causing energy transfer from the latter to the former. According to…
A TEM investigation was conducted on the structure of a second phase precipitated between the grains of a polycrystalline TiO 2 ‐rich BaTiO 3 which was doped with 8 mol% Ca. This phase was identified as Ca‐stabilized Ba 2 Ti 5 O 12 with a 10‐layer orthorhombic structure and unit‐cell parameters a=0.990, b=1.131, and c…
The results of recent investigations of the effect of high pressures on grain boundary diffusion and grain boundary migration in Aluminium are compared. The activation volume for general grain boundaries migration was found to be less than 0.2 R <R- atomic volume). On the other hand the activation volume for di…
The photoacoustic spectrum P (λ) of the superionic conductors β-Ag 3 SI and α-Ag 3 SI has been measured in the range 270≦λ≦1800 nm at room temperature. A difference in the band gap is observed in each specimen; in the annealed β-phase and in the quenched α-phase. These data can be interpreted on the basis of a simple…
Ni-base alloys exhibit excellent corrosion resistance and are used extensively in corrosive applications, although environment-induced crack growth has occurred in several applications. Environment- induced crack growth in Ni-base alloys occurs in a number of environments, including water, acidic and basic solutions,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structures of potassium aquatetrakis(nitrito)nitrosylplatinate(IV), a blue, mononuclear platinum complex with a bent nitrosyl group, and of potassium trichlorobis(nitrito)nitrosylplatinate(IV)E. S. Peterson, R. D. Larsen, and E. H. AbbottCite this: Inor…
A recently synthesized and characterized homologous series of liquid-crystal compounds (n4COOBC) is shown by high-resolution ac microcalorimetry experiments (on the n=3,6 homologs) to most likely exhibit smectic-A to smectic-B (hexatic) (Sm${B}_{H}$) phase transitions exclusively. This is in partial contrast to earlie…
The compressive stress for the shrinkage of a large pore during sintering has been analyzed by combining the effects of the pore size, the ratio of pore size to grain size, and the coordination number of the pore. Alumina has been selected to illustrate this model. The result shows that the compressive stress is a pos…
Grain boundaries in tungsten carbide crystals (hexagonal structure c/a = 0.976) show many coïncidence orientations. The most frequent orientation has a coïncidence index Σ = 2. H.R.E.M. images of such grain boundaries have been realized. These grain boundaries show a defect structure, only due to the mismatch of the a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStacked complexes of iridium and a novel form of charge compensationPaul G. Rasmussen, J. Bruce. Kolowich, and Juan Carlos. BayonCite this: J. Am. Chem. Soc. 1988, 110, 21, 7042–7049Publication Date (Print):October 1, 1988Publication History Published online1 May 2002Publish…