Materials Literature
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The dependence of secondary structure on SS content was examined to gain further insight into the role of SS bond formation in chain folding. Lysozyme was reduced to various levels, and the products were studied with respect to remaining native structure. Reductions were carried out in the absence of denaturant. Thus,…
The dynamics of librational motion in N2-type crystals is treated by taking into account both correlation and anharmonic effects. Temperature dependences of the order parameter, heat capacity, mean and free energies of the librational subsystems are calculated. Comparison is made with results of a computer experiment…
The transport properties of highly anisotropic conductors, such as tetrathiafulvalene tetracyanoquinodimethane (TTF-TCNQ) or graphite, are strongly influenced by inclusions, which can be represented as regions of different conductivity. This paper presents a theoretical study of such effects in three dimensions. Both…
Abstract Effect of alloying with rare earth elements RE (La, Pd + Nd, or so called “Mischmetall” containing Ce, Pr, Nd, La and traces of the other RE) on the ability to passivate and susceptibility to chloride breakdown of low alloys steels was investigated. Electron microprobe analysis revealed that the effect of RE…
Abstract Mit einem Gasströmungskalorimeter und der differentiellen Scanning‐Kalorimetrie (DSC) wird die Enthalpieretardation in PVC direkt als Wärmeproduktion beim Tempern gemessen (Temperaturbereich 333 bis 357 K, Zeitbereich 1 min bis 250 h). Außerdem wird der thermische Glasübergang für Kühlgeschwindigkeiten im Ber…
Abstract The microstructure of polypropylene, annealed after cold drawing to an oriented state, was examined using density measurements and small‐ and wide‐angle x‐ray scattering (SAXS and WAXS) techniques. SAXS patterns were obtained after annealing (in an oil bath), and during annealing (of samples annealed in a fur…
A general theory is developed for predicting stress and force histories for normal impact and penetration of geological targets by conical-nosed projectiles. To account for general material properties, the target medium is described by arbitrary hydrostat and shear failure-pressure relations. Using the cylindrical cav…
Room-temperature Raman spectra have been obtained between 20 cm−1 and 400 cm−1 on the low-dimensional metals TaSe3, and NbSe3. The Ag spectra exhibit numerous closely spaced lines corresponding to vibrational modes with displacement vectors perpendicular to the chain axis. To interpret these spectra we have made direc…
A new instrument has been developed which allows simultaneous measurement of partial discharge (PD) and radio-interference voltage (RIV) in insulation of high-voltage power apparatus. A distinctive feature of this instrument is that it fulfills the low input impedance (150-Ω) requirement of the RIV measuring standard…
The intermetallic compound ScFe2 is capable of absorping large amounts of hydrogen, which can be derived from the measured absorption isotherm and from the lattice constant before and after charging. The magnetic properties of ScFe2 are sensitive to small variations in the stoichiometry and are changed significantly a…
Abstract The complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982 , 457. DOI: 10.1002/anie.198204570
Abstract When mixing EPDM and BR in the Brabender a heterogeneous blend results; the dispersed phase is first sheared into fibrous strands and then broken down into micron sized particles. At low doses of irradiation, the morphology of the blend only has a minor effect on the energy to break, whereas at high doses the…
Abstract The new mineral theophrastite, Ni(OH) 2 , from Unst, is Mg-bearing and occurs associated with a very poorly crystalline Ni-containing mixed hydroxide of the pyroaurite type and/or zaratite on chromitite. X-ray powder diffraction data show a shift in d spacing toward brucite compared with pure Ni(OH) 2 . Infra…
Optical transmission and reflection measurements are reported for the quasi one dimensional solids perylene-TCNQ (P1T1) and (perylene) 3 -TCNQ (P3T1) in the region from 300 to 1200 nm. Raman spectra of single crystals of both compounds were obtained from 20 to 3000 cm −1 . With 457.9 nm excitation, combinations and ov…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual electronic spectra of the pseudotetrahedral complex [tris(3,5-dimethyl-1-pyrazolyl)ethylamine]cobalt(II) bis(tetraphenylborate)Lucia Banci, Cristiano Benelli, Dante Gatteschi, and Fabrizio ManiCite this: Inorg. Chem. 1982, 21, 3, 1133–1136Publication Date (Print):Mar…
Abstract The glass transition behavior of two sets of ABA poly(styrene‐ b ‐isoprene) block copolymers was examined by differential scanning calorimetry. In one series, the triblock copolymers had different total molecular weights and the same (30 wt %) polyisoprene content, in the other, the molecular weight was const…
ABSTRACT Experiments indicate that gypsum can be precipitated by the mixing of seawater brines of different stages of evaporation, in addition to the previously recognized mechanisms of direct evaporative crystallization and crystallization due to temperature changes. A proposed geologic model shows how gypsum precipi…
The magnetic susceptibility for 14.3 at.% Mn and 14.3 at.% Co aluminosilicate glasses has been measured via a sensitive pendulum magnetometer from 4 to 300 K in a field of 5 kOe. For temperatures above 80 K a Curie–Weiss law was obeyed in both systems; however, below 80 K strong deviations from this law occurred. From…
Abstract Found on a specimen in the mineral collection of the National Museum of Wales, no. NMW 27.111.GR414, from the Aberllyn mine, Llanrwst mining field, North Wales, with hydrozincite on a breccia cemented by sphalerite, quartz, calcite, and ankerite. Atomic absorption and TGA analyses gave ZnO 37.8, CuO 22.0, SO…
A general theory of X-ray intensity statistics for twins by merohedry is developed based on mathematical analogy of this problem to a one-dimensional random walk. Probability distribution functions are derived (a) for intensities from a single twinned specimen, and (b) for the differences in intensities from two separ…