Materials Literature
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A formula is derived for the illuminance at any surface in an optical system. By tracing a single ray one can compute the flux density at the image plane or any other position along the ray. The formula involves the ratio of the products of the principal curvatures of the wave front as it approaches each surface to pr…
Abstract A technique for the measurement of the dynamic Young's modulus E and logarithmic decrement 𝓋 of protein crystals and other microscopic samples by the resonance method modified to a microscale is described. Monoclinic crystals of horse hemoglobin and sperm whale myoglobin; triclinic hen egg white lysozyme crys…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural studies of poly(ethylenimine). 1. Structures of two hydrates of poly(ethylenimine): sesquihydrate and dihydrateYozo Chatani, Hiroyuki Tadokoro, Takeo Saegusa, and Hiroharu IkedaCite this: Macromolecules 1981, 14, 2, 315–321Publication Date (Print):March 1, 1981Pub…
The structure of seven sodium borosilicate glasses was calculated using molecular dynamics. Consistent with Zachariasen's rules of glass formation, silicon and boron were found to form a continuous near‐random network of SiO 4 , BO 3 , and BO 4 polyhedra linked to each other at corners, whereas sodium ions occupied in…
A number of summation methods for simulating polar liquids are compared using the Stockmayer potential fluid. The nearest image convention is found to have thermodynamic properties dependent on the cell shape. Spherical truncation and a summation proposed by Smith and Perram give reasonable agreement with the thermody…
The chemisorption of CO on an Fe (110) surface has been investigated at 120 K using high resolution electron energy loss spectroscopy (EELS) and low energy electron diffraction (LEED). At CO exposures up to 0.7 L two vibrational losses around 456 cm−1 and 1890 cm−1 are observed both shifting to higher frequencies with…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotooxidation of (2,2'-bipyridine)(3,4-toluenedithiolato)platinum(II) following ligand-to-ligand and charge-transfer excitationArnd Vogler and Horst KunkelyCite this: J. Am. Chem. Soc. 1981, 103, 6, 1559–1560Publication Date (Print):March 1, 1981Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrivacant heteropolytungstate derivatives: the rational synthesis, characterization, and tungsten-183 NMR spectra of P2W18M4(H2O)2O6810- (M = cobalt,copper,zinc)Richard G. Finke, Mike Droege, James R. Hutchinson, and Otto GansowCite this: J. Am. Chem. Soc. 1981, 103, 6, 1587…
We previously reported the use of polymeric delivery systems capable of sustained release of substances with molecular weights up to 2 X 10(6). The current study examined the tissue compatibilities of these slow-release agents and of other polymeric materials. To observe in vivo host responses to specific implants, te…
The structure of K3[Cr(CN) 6] at 4.2 K has been determined by a single-crystal neutron diffraction study. The crystal was found to consist of four twins together with stacking disorder [triclinic, P1, a = 8.450 (5), b = 10.576 (8), c = 13.557 (4)/k, (~ = 90.0 (1),/~ = 90.0 (1), y = 90-0 (1)°1. Refinement of atom param…
Recently, the analysis of the transient field problems in the cross section of a microalternator during a field decrement test was described. Here, a simplified formulation of the transient field problems is achieved with the introduction of the currents in the closed windings as additional state variables to the fiel…
Among other hypotheses, the classical theory of high-speed penetration assumes the incompressibility of both the projectile and target. Employing a simple Murnaghan equation of state, we show here that direct compressibility effects (pv-work) on penetration depth are at most on the order of 10–15% for projectile speed…
Abstract In the three previous papers of this series the role played by the exchangeable cations in the adsorption of methanol by homoionic montmorillonites has been investigated by different techniques, namely desorption isotherms, X-ray determination of the basal spacings and IR spectroscopy. In this last paper, mod…
This paper demonstrates the capability to perform three-dimensional computations for explosive-metal interaction problems with complex sliding surfaces. An analysis is performed for an explosive device which accelerates a metal liner known as a self-forging fragment. Results are presented to show the effects of off-ce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn interstitial hydrogen atom in a hexanuclear metal cluster: x-ray and neutron diffraction analysis of [(Ph3P)2N]+[HCo6(CO)15]-Donald W. Hart, Raymond G. Teller, Chiau-Yu Wei, Robert Bau, Giuliano Longoni, Stefano Campanella, Paolo Chini, and Thomas F. KoetzleCite this: J.…
Abstract not Available.
Magnetic susceptibility, electrical resistivity, Mössbauer effect (ME) and transmission electron microscopy measurements in single crystals of the metal intercalated layer compounds FexTaS2 (0.20⩽x⩽0.34) are reported. The compounds are metallic, ferromagnetic and have large coercive force. ME measurements show the iro…
The pressure effect on the Curie point of the Heusler alloys Ni2MnSn and Ni2MnSb was measured. The pressure coefficients of the Curie point were determined to be (1/Tc) (dTc/dp) = 1.6×10−3 1/kbar for Ni2MnSn and 9×10−3 1/kbar for Ni2MnSb, respectively. The volume exchange striction of Ni2MnSn was also studied. The pre…
The resistivity, Seebeck coefficient, Hall coefficient, and superconducting transition temperature have been measured in ${\mathrm{K}}_{x}$ W${\mathrm{O}}_{3}$ for $0.20<~x<~0.32$ over the temperature rangee 1.5 to 375 K. The normal-state transport properties show temperature- and composition-dependent anomalies…
Abstract A fast physical method is used to measure oxygen solubilities in various solutions of sugars and salts, in nutrition media, and in fermentation broths of Penicillium chrysogenum . The findings were compared with the predictions of a solubility model which assumes that the solubility reduction is log‐additive…