Materials Literature
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Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Douglas S. Goodman, "Theory and Practice of Scanning Optical Microscopy," J. Opt. Soc. Am. A 4, 551-552 (1987) Export Citation BibTex Endnote (RIS) HTM…
一、引言 Bednorz和Muiller发现在Ba-La-Cu氧化物系统中可能存在35K的超导电性,Uchida和Takagi等人观察到Meissner效应,从而确定了该系统的超导电性的存在. 国内外几个小组在短时间内报道了他们有成效的结果. Chu等人报道了在流体静压下获得起始超导转变温度为52K的结果,Cava等人获得了接近于单相的超导相,其转变温度为36.2K,
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSize quantization in layered semiconductor colloids with tetrahedral bonding: mercury diiodideO. I. Micic, M. T. Nenadovic, M. W. Peterson, and A. J. NozikCite this: J. Phys. Chem. 1987, 91, 6, 1295–1297Publication Date (Print):March 1, 1987Publication History Published onli…
The mechanism of lattice thermal expansion in pure hexagonal cordierite prepared by glass devitrification was investigated by time‐of‐flight neutron powder diffraction at temperatures from 22° to 750°C under vacuum. Full matrix least‐squares refinement of the diffraction spectra was carried out in space group P6/mcc u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTpH-sensitive nickel(II) hydroxide-based microelectrochemical transistorsMichael J. Natan, Daniel. Belanger, Michael K. Carpenter, and Mark S. WrightonCite this: J. Phys. Chem. 1987, 91, 7, 1834–1842Publication Date (Print):March 1, 1987Publication History Published online1 M…
Crystalline fine powders of LiAlO 2 can be prepared by hydrolysis of metal alkoxides for application to the breeder blanket in nuclear fusion. The precipitates were fine crystalline particles of β‐LiAlO 2 of ∼0.1‐μm size under controlled conditions. The transformation from β‐ to γ‐phase was confirmed at temperatures b…
The reproducibility of median-time-to-failure (t50) measurements was determined in an interlaboratory experiment in which 11 laboratories and a reference laboratory took part. Each laboratory used a method of its choosing to test equivalent samples under the same conditions of current density and oven temperature. The…
Abstract The literature on rigid polyurethane foam has been reviewed with an emphasis on the gaseous products generated under various thermal decomposition conditions and the toxicity of those products. This review is limited to publications in English through 1984. Carbon monoxide (CO) and hydrogen cyanide (HCN) were…
Abstract Thermal transformations of kaolinite were studied by 29 Si- and 27 Al-MAS/NMR and ESR techniques. In metakaolin, Si is still dominantly in the Q 3 state (three Si atoms bonded to an Si-O 4 tetrahedron) and Al detectable by NMR is in both 4-coordination and 6-coordination. Coordination polyhedra around Al or F…
Als molekulare Lichtwandler können die Eu3⊕- und Tb3⊕-Cryptate der Liganden 1–3 fungieren. Die Komplexe geben charakteristische 1H-NMR-Spektren, und das Eu3⊕-Cryptat läßt sich elektrochemisch reversibel reduzieren (−535 m V vs SCE).
The following new or updated patterns are submitted by the JCPDS Research Associateship at the National Bureau of Standards. The patterns are a continuation of the series of standard X-ray diffraction powder patterns published previously in the NBS Circular 539, the NBS Monograph 25, and in this journal. The methods o…
The thermal protective performance of 21 heat-resistant fabrics made with poly benzimidazole (PBI), aromatic polyamide (aramid), and blends of PBI with aramid or with flame retardant rayon fibers was evaluated in laboratory tests using highly intense exposures to radiant or convective heat sources. The contribution of…
The theory of double exchange is generalized to mixed valence (MV) trinuclear clusters. The results obtained by quantum-theoretical calculations of exchange and resonance splittings are compared to the results of the model theory which takes account of Heisenberg and double exchange. The comparison demonstrates unambi…
The longitudinal end effect in a linear induction motor (LIM) is analysed assuming two travelling magnetic flux density waves in the airgap: the wave travelling with synchronous velocity and the wave representing end effect [1]. A simple equation for the end effect factor which modifies the airgap EMF is obtained, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, aggregation, electrocatalytic activity, and redox properties of a tetranuclear cobalt phthalocyanineW. A. Nevin, W. Liu, S. Greenberg, M. R. Hempstead, S. M. Marcuccio, M. Melnik, C. C. Leznoff, and A. B. P. LeverCite this: Inorg. Chem. 1987, 26, 6, 891–899Publica…
Summary Casing wear caused by rotation of nonhardbanded tool joints has been investigated with a full-sized test machine. Three grades of casing were used during this study: K55, N80, and PI 10. Tests were conducted in both water-based and oil-based muds. Contact forces between the tool joint and casing were either 1,…
The sodium titanates Na 4 TiO 4 , α, β‐, and γ‐Na 2 TiO 3 , Na 8 Ti 5 O 14 , Na 2 Ti 3 O 7 , and Na 2 Ti 6 O 13 , all of which can be synthesized in the temperature range 800° to 1200°C, have been characterized by X‐ray diffraction (XRD) and Raman spectroscopy. The existing XRD data have been critically reviewed and s…
The binding of multiple deuterium (D) atoms to vacancies in iron (Fe) is investigated both experimentally, by use of ion-beam techniques, and theoretically, by use of the effective-medium scheme. The experimental D-release stages are accounted for by trapping at vacancies with a binding enthalpy that depends on occupa…
A transmission electron microscopy study has been carried out to understand the structural transformation mechanisms of decomposition of Mg(OH) 2 and MgCO 3 under vacuum. Both Mg(OH) 2 and MgCO 3 decompose topotactically to yield porous pseudomorphic MgO of normal structure with definite orientation relationships. The…
The relationship between all the polyoxotungstophosphates related to PW 12 O 40 3− and P 2 W 21 O 71 6− anions was established. A new compound K 10 P 2 W 20 O 70 was synthesized and characterized by infrared and Raman spectroscopy. These properties, and especially the 31 P and 183 W nuclear magnetic resonance spectra,…