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。
Abstract X‐ray photoelectron and x‐ray‐induced Auger spectroscopic analyses of various copper‐containing catalysts have been used to reveal the chemical state of copper during on‐stream in the dehydrogenation of methanol to methyl formate. Three catalyst systems have been selected for this purpose: (1) supported prepa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAre ring polymers adsorbed on a surface more than linear polymers?G. Stratouras and M. KosmasCite this: Macromolecules 1992, 25, 12, 3307–3308Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://pubs.acs.org/…
Abstract For a number of chiral α,β‐unsaturated carbonyl compounds, cyclohexanone and cyclohexenone derivatives, existing essentially in the form of single molecular conformation, the correlation dependences were established between the values of the calculated dissymmetry functions (DF) with respect to atomic masses…
Abstract Annealing poly(ether ether ketone ketone) (PEEKK) between glass transition and melting temperature generally results in a pronounced double peak melting behavior as obtained by DSC. Detailed investigations of the dependence of this double peak melting behavior on annealing conditions and experimental paramete…
The aging of impregnated polypropylene (PP) film has been carried out on capacitor models at 80 degrees C under 50 Hz AC electrical stress (137 V/sub rms// mu m). The damage was estimated from the local measurement of the breakdown voltage of the PP film. The effects of impurities (electrolyte, water, oxygen) added to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic and stereoselective activities of manganese achiral and chiral porphyrins in dioxygenation of tryptophan derivativesKatsutoshi Ohkubo, Takashi Sagawa, and Hitoshi IshidaCite this: Inorg. Chem. 1992, 31, 13, 2682–2688Publication Date (Print):June 1, 1992Publication…
The density of Ga 2 O 3 liquid in equilibrium with air has been measured at 1800 0 to 1900 0 C using an Ir double‐bob Archimedean method. The data yield the following description of the density of Ga 2 O 3 liquid: ρ= 4.8374(84)–0.00065(12)(T −1850 0 C). This density‐temperature relationship is compared with the partia…
XPS indicates that the organometallic compd. [PtI[C6H3(CH2NMe2)2-2,6](h1-I2)], (I), representing an end-on coordinated dihalogen intermediate in the oxidative addn. reaction of dihalogen to d8 metal centers, contains platinum in a divalent oxidn. state. The use of a monochromatized x-ray source, short measurement time…
Research studies which provide insight into the response of human skin to fabric when contacted by and/or covered with fabric are reviewed When possible, the fabric parameter thought influential in eliciting a certain response (e.g., increase in capillary blood flow, hydration state) is given. The operating principles…
Stimulated-photon-echo measurements as a function of both the first-to-second (\ensuremath{\tau}) and the second-to-third (T) pulse separations were conducted to study the echo-modulation behavior for the $^{3}$${\mathit{H}}_{4}$${\mathrm{\ensuremath{-}}}^{1}$${\mathit{D}}_{2}$ transition of a cryogenic ${\mathrm{Pr}}…
Abstract The microstructures across the whole thickness of uncorroded and corroded rapidly solidifed Mg and Mg‐9% Al ribbons have been characterized using TEM cross‐sectional techniques. In this way, differences in susceptibility to and mechanisms of corrosion initiation between four clearly different magnesium alloy…
In Shanghai, China, industrial contamination is very severe and periodic insulator washing is performed not only in substations but also on transmission lines. In order to review the present insulator contamination design and maintenance practices, a series of periodical contamination measurements under de-energized c…
The attcntuation of ultrasonic waves propagating in polycrystalline metals is a subject which has received considerable experimental and theoretical attention. Important recent contributions include the work of Hirsekorn and of Stanke and Kino. In this paper, we extend the approach of the latter authors to a particula…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSymmetrical and unsymmetrical quadruply aza-bridged, closely interspaced, cofacial bis(5,10,15,20-tetraphenylporphyrin)s. 2. Synthesis, characterization, and conformational effects of solventsRafik Karaman, Andrei Blasko, Orn Almarsson, Ramesh Arasasingham, and Thomas C. Bru…
Abstract K 2 YZr(PO 4 ) 3 and K 2 GdZr(PO 4 ) 3 were found to have the langbeinite-type structure (K 2 Mg 2 (SO 4 ) 3 ). We determined the crystal structure of these compounds from powder diffraction data. They are cubic P2 1 3 (no. 198), with a = 10.3346(1)Å and a = 10.3457(3)Å respectively. The intensity values we o…
We report accurate temperature dependent measurements of optic indices of refraction, the birefringence, and the strain in the ferroelectric tungsten bronze crystals Ba0.25Sr0.75Nb2O6 and two compositions of (Ba2−xSrx)2(K1−yNay)2(NbO3)10. These results are compared to our previous results in Ba0.4Sr0.6Nb2O6. From the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlkane reactions with photoactivated decatungstate in neutral and acid solution: molecular orbital theoryS. F. Jen, Alfred B. Anderson, and Craig L. HillCite this: J. Phys. Chem. 1992, 96, 13, 5658–5662Publication Date (Print):June 1, 1992Publication History Published online…
Abstract Iron-rich dioctahedral 2:1 clays were sampled in metalliferous sediments from Atlantis II Deep (Red Sea), and studied by XRD, TEM, FTIR and Mössbauer spectroscopy. One sample with the structural formula (Si 3·94 Fe 3+ 0·06 )(Fe 3+ 1·90 Mg 0·10 )K 0·1 (Mg, Ca) 0·03 is closer to the theoretical end-member ferri…
Abstract The crystal structure of sophiite, Zn 2 (SeO 3 )Cl 2 (a = 10.251(4), b = 15.223(2), c = 7.666(5) Å, Z = 8) was solved in space group Pccn from single crystal X-ray data, and refined to R = 0.053 for 666 F o > 4o F o . The mineral belongs to layer compounds. The threefold coordinated Se atom is at the apex…
The most basic single axial cyclic motion (i.e. fatigue) tests by the alternative heating up and cooling down of shape memory Ti-Ni50.2at%wires were performed. Heating up was done by direct current method or temperature controllable water-bath and the characteristics on the cyclic motion and its degradation in shape m…