Materials Literature
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Dielectric anisotropy of heavy ice Ih is examined in a wide temperature range by measuring the complex dielectric constants parallel and normal to the c axis, and it is compared with that of ordinary ice Ih (H 2 O ice). The increased anisotropy in the static dielectric constants including only the shift of the extrapo…
Abstract The desorption of methanol and isopropanol by a series of charge-deficient Ca-montmorillonites (prepared by a partial Li-saturation and subsequent heat treatment of Camp-Berteau material) has been monitored gravimetrically and by XRD. The results indicate that about half the total adsorbed molecules do not oc…
Thermal expansion coefficients correlate with a number of physical properties of crystals. Cubic ionic insulators that have two completely filled sets of lattice sites have a maximum value for the product of the coefficient and melting point. Expansion is diminished by the presence of various internal degrees of freed…
The paper employs a Monte Carlo method to calculate the heating, secondary ionization and Lyman-alpha excitation produced by the energetic electrons released by X-ray photoionization of interstellar gas. The new features of this computation are the inclusion of current cross sections for electron collisional ionizatio…
A finite difference numerical analysis technique has been used to evaluate the distribution of the electrode potential within the electrolyte above a galvanic corrosion couple with linear, semi‐infinite, coplanar electrodes. Corrosion reactions are assumed to be under activation control with logarithmic polarization b…
Infrared spectroscopic study of desert varnish, manganese dendrites, river deposits, and other manganese oxide concentrations of the terrestrial weathering environment has shown that the morphological distinctions among them have a sound basis in differences in their mineralogy. The manganese oxide in manganese dendri…
A statistical mechanical theory of the Frank elastic constants is formulated. The free energy functional is constructed for the deformed sample and the free energy density is defined for the case of small spatial gradients. The Frank constants are expressed in terms of the direct correlation function c(1, 2) and the o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of an oxoporphinatochromium(V) complexJohn T. Groves and William J. Kruper Jr.Cite this: J. Am. Chem. Soc. 1979, 101, 25, 7613–7615Publication Date (Print):December 1, 1979Publication History Published online1 May 2002Published inissue 1 Dece…
Abstract The critical concentration at which a metal‐filled composite becomes electrically conductive can be dramatically reduced by adding the metal as randomly dispersed fibers. The higher the aspect ratio of the fibers, the lower the concentration needed to induce electrical conductance. Composites exhibiting resis…
Abstract The stress‐strain response of crystalline high density polyethylene and of amorphous polycarbonate has been determined in tension and in compression at superimposed pressures up to 1104 MPa(160 ksi). Strain softening occurred in the polycarbonate at low pressures but was inhibited by pressure. Tensile necking…
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Molecular dynamic calculations of the structure of a series of sodium silicate glasses, a common soda–lime glass, a sodium borosilicate glass and a sodium–potassium silicate glass were made. Calculated radial distribution functions are in good agreement with existing x-ray diffraction data and a previous MD calculatio…
Small metallic particles with diameters in the range 1–100 nm have interesting properties which can sometimes be very different from those of bulk metals. Such colloidal particles play an important part in fields which range from catalysis to radiation damage in compound solids, and also have an intrinsic interest sin…
We have studied the crystallization of Bacillus ste- arothermophilus tryptophan tRNA synthetase. Exper- imental conditions used in 35 different crystallization trials were chosen by systematic assignment of varia- bles in accordance with the two principles of randomi- zation and balance, which are characteristic of in…
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