Materials Literature
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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…
Using Beta/Beta prime dimethypyrrole polymers to reduce the structural disorder it has been possible to interpret the results of electron diffraction data and to propose and idealized structure for neutral polypyrrole. XPS data have been used to define some of the deviations from this ideal structure that are seen in…
Bovine and lathyritic rat type III collagen preparations were analyzed for the presence and in vitro formation of intermolecular disulfide cross-links. Type III collagen from fetal bovine skin was extracted with the aid of pepsin and purified by differential salt precipitation, guanidine denaturation, and renaturation…
It is shown that the orientation dependent excluded volume interaction between elongated nematic molecules and the cell walls always favors the planar alignment of nematic liquid crystals. For thermotropic liquid crystals the anchoring energy of this effect amounts to several erg/cm 2 .
The tensile flow stressσ∊ has been studied for super-pure and commercial aluminium and for an Al-21/4% Mg alloy in relation to strain, grain size d, subgrain or cell size and dislocation density ρ. At room temperature and 200°C, the flow stress depends on both ρ1/2 and d −1/2. This is interpreted an evidedce of a requ…