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Temperature dependence of hardness and expansion in icosahedral Al 72 Pd 20 Mn 8 alloy ( i -AlPdMn) are examined in comparison with a cubic Al 60 Pd 25 Mn 15 alloy ( c -AlPdMn). The hardness at room temperature is about 780 kg/mm 2 for i -AlPdMn, much greater than that for c -AlPdMn of 420 kg/mm 2 , and decreases to a…
Abstract Time-of-flight (TOP) neutron diffraction experiments have been carried out for pure liquid D2O and concentrated aqueous deuterochloric acid solutions (DCl)x(D2O)1−x (x = 0.10, 0.23). The errors due to the inelasticity effect on the molecular structure in the solution were markedly reduced by the TOF measureme…
The dielectric properties of mica-type silicates and layered double hydroxides have been studied in the pristine and various intercalated forms in the frequency range 101–107 Hz. A relaxation peak has been observed for the pristine silicate, whereas the pristine layered double hydroxide exhibits an anomalous low-frequ…
Abstract A free‐volume theory is developed for the analysis of Fickian diffusion processes in glassy polymers. Equations are presented for the prediction of mutual diffusion coefficients in concentrated glassy polymer‐penetrant systems. The concentration dependence of the mutual diffusion coefficient is dependent on h…
The effect of processing and material parameters on the sintering and coarsening of model composites consisting of a fine‐grained ZnO matrix and coarse, rigid, inert particulate inclusions of ZrO 2 was investigated. The green composites were formed by two methods: (i) mixing the matrix and inclusion powders in a ball‐…
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Effects of vacuum annealing and dry oxidation on the photoluminescence properties of porous Si are reported. Anodized porous Si is formed by electrochemical etching in an aqueous HF solution of 16 to 48 wt% with a current density of 10 to 70 mA/cm 2 . A subsequent vacuum annealing (from 400°C to 800°C) weakens the int…
We have measured the dc conductivity and lattice parameters of hexa(hexylthio)triphenylene (HHTT) saturation doped by exposure to iodine vapor, using a four-probe resistivity technique and powder x-ray diffraction. The compound was further characterized by differential scanning calorimetry, thermogravimetric analysis,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrins with exocyclic rings. 2. Synthesis of geochemically significant tetrahydrobenzoporphyrins from 4,5,6,7-tetrahydro-2H-isoindolesDonald A. May Jr. and Timothy D. LashCite this: J. Org. Chem. 1992, 57, 18, 4820–4828Publication Date (Print):August 1, 1992Publication H…
The NtrC transcription factor is a member of a family of homologous prokaryotic regulatory proteins that participate in the transduction of extracellular and nutritional signals. It has been demonstrated that the phosphate group from a histidine residue of the phosphorylated NtrB protein autokinase is transferred to t…
Article Crystal structure of rhodesite, HK1-xNax+2yCa2-y{lB,3,22∞}[Si8O19]·(6-z)H2O, from three localities and its relation to other silicates with dreier double layers was published on August 1, 1992 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 199, issue 1-4).
Abstract NCS (C/1931) and DIN (C/1931 and D65/1964) notations of the 558 OSA‐UCS atlas samples are presented in two tables. One table provides the NCS and DIN notations for the 424 regular samples; the other for the 134 near‐neutral (half‐step) samples.
Abstract 4‐Fluorobenzophenone reacted with potassium carbonate in the presence of silica catalyst in diphenyl sulfone solvent to yield 4,4′‐dibenzoyldiphenyl ether. This new etherification reaction was extended to three difluoro aromatic ketones. 4,4′‐Bis(4‐fluorobenzoyl)diphenyl ether ( I ) reacted with potassium car…
In situ diffuse reflectance infrared spectroscopy of CO adsorption on reduced Ru/ZSM-5 reveals that, under appropriate conditions, in addition to the linearly adsorbed CO on metallic Ru particles (at 2045 ± 10 cm −1 ), two multicarbonyls involving oxidized Ru can be generated. These multicarbonyl species are character…
The effects of a pulsed discharge on the luminous plume generated during the excimer laser ablation of YBa2Cu3O7−X are investigated in an oxygen environment. A high-voltage capacitor discharge circuit is used to generate a pulsed discharge. The pulsed discharge is initiated by the laser-induced plume. The electric fie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMussaendosides M and N, New Saponins from Mussaenda pubescensJun-Ping Xu, Ren-Sheng Xu, Zi Luo, Jie-Ying Dong, and He-Ming HuCite this: J. Nat. Prod. 1992, 55, 8, 1124–1128Publication Date (Print):August 1, 1992Publication History Published online1 July 2004Published inissue…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation W. S. C. Williams, Douglas S. Fielder; Nuclear and Particle Physics.. Am. J. Phys. 1 August 1992;…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT2,2-Dichloro[1.1.1]propellane.Steven J. Hamrock and Josef MichlCite this: J. Org. Chem. 1992, 57, 18, 5027–5031Publication Date (Print):August 1, 1992Publication History Published online1 May 2002Published inissue 1 August 1992https://pubs.acs.org/doi/10.1021/jo00044a048http…
The compound is orthorhombic, P2 1 2 1 2 1 , with a=6.674, b=9.161, c=7.398, Z=4. Its structure has been refined to an unwheighted residual of 0.019, using all 459 observed reflections. The overall structure can be described as cross-linked chains of Cu and Se coordination polyhedra. Linked by O2 and O3, SeO 3 alterna…
A series of PVC (polyvinyl chloride) compounds containing 0–100 phr (parts by weight per hundred parts of PVC resin) di-isooctyl phthalate was subjected to tensile testing at temperatures in the range from room temperature to 180°C. It was found that the relationships between elongation at break and stress at break fo…