Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal EPR of the oxygen-17-enriched dioxygen adduct of vitamin B12r: reversible oxygen bonding, electronic and geometric structure and molecular dynamicsE. Joerin, A. Schweiger, and H. H. GuenthardCite this: J. Am. Chem. Soc. 1983, 105, 13, 4277–4286Publication Date…
The development of a model for a consistent prediction of metal fire in high pressure oxygen has been attempted. The reaction schemes and reaction rates of metal oxidation are inferred, and the burning region spread rates are predicted. The burning region spread rate V over an infinite thickness piece is shown to depe…
A theory describing bulk better operation is presented. The theory is applicable to a diatomic gas which adsorbs dissociatively on a getter material which exhibits a time independent sticking coefficient. The theory includes the effects of surface reactions and bulk diffusion. Exact numerical solutions are presented f…
An X-ray crystallographic analysis of zinc(II) monoglycerolate has been carried out. The crystals are monoclinic, space group P21/c with a 8.110(1), b 6.404(1), c 8.714(2)Å ß 93.44(1)º. The structure was refined by full-matrix least-squares techniques to an R factor (on 519F) of 0.019. The analysis reveals that the zi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContact angle between water and a poly(vinylferrocene) film on a potential-controlled platinum electrodeK. W. Willman and Royce W. MurrayCite this: Anal. Chem. 1983, 55, 7, 1139–1142Publication Date (Print):June 1, 1983Publication History Published online1 May 2002Published…
The authors find from NMR (spin-echo) and X-ray diffraction that plastic deformations during cold work introduce many dislocations and associated lattice deformations in a number of Heusler alloys: Pd 2 MnSn, Pd 2 MnSb, Cu 2 MnIn, Cu 2 MnAl, Ni 2 MnIn, Pd 2 MnIn and NiMnSb. In Pd 2 MnSn these effects are very importan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantum effects of high-frequency modes in inorganic electron transfer: kinetic isotope effects in redox reactions of hexaaquairon(2+) ion ([Fe(H2O)6]2+, hexa(aqua-d2)iron(2+) ion ([Fe(D2O)6]2+), and hexa(aqua-18O)iron(2+) ion ([Fe(18OH2)6]2+)Tom Guarr, Ephraim Buhks, and Ge…
Broad area electrodes show enhanced electron emission at fairly low dc and rf fields E ~ 107 V/m, thus preventing the attainment of higher electric field strengths E. The enhanced electron emission is initiated by hot electrons, which gained their energy fdxeE in dielectrics ("dust"). Due to their excess energy, hot e…
The structure is composed of the following structural units: (a) tetrahedral sheets S, with composition (Si 6 O 15 ) (super -6) , characterized by five- and eight-membered rings of silicate tetrahedra, with five tetrahedra pointing in one direction and one tetrahedron pointing in the other direction; (b) three-repeat…
We are developing a computer simulation method of predicting the mechanical properties of nonwoven fabrics based on a fundamental microscopic description of the system. The program starts with the known mechanical properties of a given fiber laid out in a web of a particular initial geometry that is held together by s…
A model is developed to estimate the force on a conical-nosed penetrator for normal entry into geological targets that have linear hydrostats and fail according to a Mohr-Coulomb criterion with a tension cutoff. The model is applicable to targets with shear strength which either increases with pressure (dry rocks) or…
The influence of molecular structure on the mesomorphic properties of thermotropic liquid crystals is discussed. The role of intermolecular attractive and repulsive (steric) forces in determining the packing and consequently the mesomorphic behaviour of the molecules is described. A correlation between the geometry of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic sonochemistry. Ultrasonic acceleration of the hydrosilation reactionByung Hee Han and Philip BoudjoukCite this: Organometallics 1983, 2, 6, 769–771Publication Date (Print):June 1, 1983Publication History Published online1 May 2002Published inissue 1 June 1983https://…
A new lot of high-purity silicon powder with mean crystallite size of about 6 μm has been certified as Standard Reference Material 640a. This SRM can be used as both an external and an internal 2θ calibration standard. The lattice parameter, uncorrected for refraction, is a = 5.430825(11) for λ(Cu Kα1) = 1.5405981 Å a…
Recently, Morch [1,2,3,4] Chahine [5,6] and others have focused attention on the dynamics of a cloud or cluster of cavitating bubbles and have expanded on the work of van Wijngaarden [7,8] and others. Unfortunately, there appear to be a number of inconsistencies in this recent work which will require further study bef…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrosion of aluminum-matrix composites. Status reportMarvin Metzger and S. G. FishmanCite this: Ind. Eng. Chem. Prod. Res. Dev. 1983, 22, 2, 296–302Publication Date (Print):June 1, 1983Publication History Published online1 May 2002Published inissue 1 June 1983https://pubs.a…
The hyperfine splitting of the ground state and the lowest electronic component of the (1)D(2) excited state have been measured for Pr(3+) in YAG. We show that a particularly simple and powerful technique is the production of sublevel coherence by short-pulse (impact) excitation, which is detected by coherent forward…
Etude des vibrons couples non lineairement aux vibrations reticulaires dans des cristaux moleculaires 1D: les solitons vibroniques ainsi formes sont gouvernes par l'equation de Schrodinger non lineaire ou les solitons de Davydov, obeissant a la meme equation, sont plutot applicables aux excitons avec transfert par int…
The Mössbauer spectroscopy has been applied to iodine-doped polyacetylene employing 129 I. It is found that the polymer films contain I - , I 3 - and I 5 - with symmetrical charge population, where the content of each iodide anion depends on the doping level. Under dynamic evacuation, it is elucidated that I 5 - conve…
The microstructure of many electroceramic components based on barium titanate is dominated by anomalous grain growth. At firing temperatures below the eutectic temperature nearly all large crystallites were found to contain lamellae. The crys‐tallographic orientation of these lamellae was studied by TEM. By combining…