Materials Literature
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Crystals of the complex formed by human Fc fragment and fragment B (FB) of protein A from Staphylococcus aureus were prepared and the crystal structure determined at high resolution by multiple isomorphous replacement. Phase were improved considerably by combining these phases with calculated phases from the Fc compon…
We show how recent theories of two dimensional melting can be carried over to provide natural order parameters for solid, smectic B, and smectic A phases of liquid crystals. Smectic B and other well-ordered smectic phases correspond to systems with bond orientational long range order and positional short range order i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of Caprolactam Formation from 6-Aminocaproic Acid, Ester, and AmideFrank Mares and Desmond SheehanCite this: Ind. Eng. Chem. Process Des. Dev. 1978, 17, 1, 9–16Publication Date (Print):January 1, 1978Publication History Published online1 May 2002Published inissue 1…
By the use of convergent-beam and critical-voltage measurements it has become possible to measure the crystal potential to an accuracy of about 10-3. The possibility that the contribution from virtual inelastic scattering is greater than the errors in these experiments is examined and it is shown that only virtual sca…
The effect of hydrogen on the crack propagation behavior and the microstructures around cracks in SUS 304H type and SUS 310 type austenitic stainless steels was examined by means of the tensile tests and microscopic observations. The results obtained are summarized as follows:(1) For austenitic stainless steels, the y…
Il est montré que la signification de la loi généralisée de Bravais est que la vitesse de croissance d'une face est d'autant plus petite que l'énergie d'attachement est plus petite. Les principes de la méthode des PBC sont décrites. Un aperçu est donné du rôle de la sursaturation et de l'adsorption des impuretés dans…
This paper describes the preparation and properties of sterically stabilised polymer latex dispersions in the lower liquid alkanes down to ethane, and in liquid xenon. They exhibit both upper and lower flocculation temperatures which for small latex particles and thick adsorbed layers correlate closely with the bulk p…
On présente quelques propriétés spectroscopiques, de verres dopés, importantes pour la conception de mini-lasers telles que : forces d'oscillateur, section. efficace laser, durée de vie radiative et rendement quantique en fonction de la concentration. Deux verres, un tellurite de lithium et un phosphate de cadmium pot…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitric Acid Oxidation of High-Density Polyethylene. Organic Chemical AspectsL. Russell MelbyCite this: Macromolecules 1978, 11, 1, 50–56Publication Date (Print):January 1, 1978Publication History Published online1 May 2002Published inissue 1 January 1978https://pubs.acs.org/…
Abstract Feldspar grains or their pseudomorphs from the different weathering zones are studied with the SEM. Weathering commences with dissolution to form voids in the grains. Close to the rock, the first product is allophanic material present as globules adhering to the voids in the grains. In the δ zone the product…
A new aluminium silicate has been produced under hydrous conditions from Al2O3-SiO2 oxide mixes with Si/Al ratios close to unity, at pressures greater than 100 kilobars and at about 1, 000°C. X-ray powder photographs indicated one dominant new phase. From analyses of the electron diffraction Laue zones of minute fragm…
Thermoelectric generators have no moving parts, are silent in operation and are compact, and, when coupled to an isotropic heat source, can operate unattended over long periods in inhospitable and inaccessible environments. In recent years, thermoelectric generators have found increased application in situations where…
The topological classification of distortions in ordered media leads naturally to a distinction'between singular distortions (defects) and non singular distortions. However, in cholesteric liquid crystals, where the order parameter contains components with different rigidities, the optically observed distortions prese…
The equilibrium adsorption–desorption behaviour of small, positive polystyrene latex particles onto much larger, negative polystyrene latex particles, in which both sets of particles carry adsorbed poly(vinyl alcohol)(PVA) molecules, has been studied as a function of the molar mass of the PVA, and the ionic strength.…
Elastic moduli and fracture toughness were determined for several glasses in the systems soda‐alumina‐silica, calcia‐alumina‐silica, and soda‐boric oxide‐silica. Results for the aluminosilicates are analyzed in terms of Al 3+ :Na + ratios. The mechanical properties do not show maxima or minima at the Al 3+ :Na + ratio…
The threshold characteristics of an instability in the form of longitudinal flexo-electric domains, arising in thin layers of liquid crystals exposed to a d.c. field were investigated for two nematic mixtures based on azoxy-and ester compounds. The experimental dependences of the threshold voltage and the domain perio…
Abstract The nucleation and growth behavior of a poly(1‐butene) melt has been measured as a function of undercooling and shear rate. Experiments were conducted using a parallel‐plate rotary shearing device with polarized light microscopy as the measuring technique. An exponential increase of nuclei with time at consta…
Abstract A model for amorphous metals is proposed. The model is based on the 13 atom icosahedron which is the minimum energy structure for a 13 atom cluster. An amorphous metal is considered as containing a high density of these structural units. The material surrounding the icosahedra is partially ordered. The spaces…
Article Studies of structure and dynamics of solid polymers by elastic and inelastic neutron scattering was published on January 1, 1978 in the journal Pure and Applied Chemistry (volume 50, issue 11-12).
C2-oxygenated compounds composed mainly of ethanol were catalytically produced from CO and H2 under atmospheric pressure over pyrolysed Rh carbonyl clusters dispersed on specific metal oxides such as TiO2, ZrO2, and La2O3.