Materials Literature
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Several types of insulator strings covered with ice or snow were tested for ac, dc, and switchings impulse voltages. Reductions of flashover voltage were noted for all voltage types. These reductions were more acute on ice or snow covered insulator strings than on salt contaminated strings when deposits of salt were l…
The thermal degradation of PVC was studied at 190°C in pure nitrogen and nitrogen containing 10, 20, and 40% HCl (by volume). The rate of dehydrochlorination was determined by gravimetry. Degradations in nitrogen were followed with conductometry in addition. Changes in molecular weight distribution and degree of long-…
Lactose killing is a peculiar phenomenon in which 80 to 98% of the Escherichia coli cells taken from a lactose-limited chemostat die when plated on standard lactose minimal media. This unique form of suicide is caused by the action of the lactose permease. Since uptake of either lactose or galactose by the lactose per…
A method for the purification of yeast K+-activated aldehyde dehydrogenase is presented which can be completed in substantially less time than other published procedures. The enzyme has a different N-terminal amino acid from preparations previously reported, and other small differences in amino acid content. These dif…
The axial electric field gradient (EFG) at the Eu site of cubic pyrochlore ${\mathrm{Eu}}_{2}$${\mathrm{Z}}_{2}$${\mathrm{O}}_{7}$ (where $Z=\mathrm{T}\mathrm{i},\phantom{\rule{0ex}{0ex}}\mathrm{R}\mathrm{u},\phantom{\rule{0ex}{0ex}}\mathrm{I}\mathrm{r},\phantom{\rule{0ex}{0ex}}\mathrm{M}\mathrm{o},\phantom{\rule{0ex}…
Hyperfine structure observed at g′≃9.4 and g′≃4.3 in the EPR spectrum of Mn2+ in several glasses is analyzed on the basis of the theory of Griscom and Griscom [J. Chem. Phys. 47, 2711 (1967)] and Aasa [J. Chem. Phys. 52, 3919 (1970)]. The complex hyperfine structure at g′=4.3 is found to be a superposition of three se…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in binuclear transition-metal complexes. 17. Benzidine and p-phenylenediamine, extended aromatic diamine bridging ligands in binuclear copper(II) 2,2',2''-triaminotriethylamine and vanadyl bis(hexafluoroacetylacetonate) complexesTimothy R. Felt…
Abstract The broad‐line proton NMR spectra of polyethylene are separated into three components (broad, medium, and narrow) corresponding to the crystalline and two kinds of amorphous protons, respectively. All amorphous protons are found to be mobile above 210°K. The unusually low molecular mobility in the amorphous r…
Radicals are stabilized by simultaneous substitution with a donor (X) and an acceptor group (Y). Thus (1) and isobutyronitrile radicals do not give a polymer but the radical (2) which is stable when hot.
Complete sets of measurements are reported of the elastic, dielectric, optical, and viscous properties of new liquid-crystal mixtures for twisted nematic displays. Their optical and capacitive threshold voltages were shown to be identical and were used to determine the twist elastic constants k22. The splay (k11) and…
The influence of densification on the remanence, the coercivities and the interaction field was measured for two differing powders of γFe2O3. The coercive force Hcand two remanence coercivities Hrand H'r(deduced from d.c. demagnetization and static remanence curves, respectively) vary linearly on compression, as does…
A parametric correlation (p less than 0.01) has been found between the in vitro thermal stability and in vivo turnover rates of nine intracellular proteins. These results are discussed in terms of a "thermodynamic" model for turnover control, in which the rate of intracellular protein degradation is controlled by intr…
Disorder in stacking sequences of mica minerals, predominantly 1M muscovite from York, Ontario and biotite from Mitchell Co., North Carolina, was observed using high-resolution electron microscopy. The specimens were prepared by sectioning the flakes of mica in the microtome with a diamond knife, so that crystals were…
Below 1 K the heat capacity C(T) of bulk amorphous As is proportional to the cube of the absolute temperature T, in marked contrast to the behaviour of other amorphous solids. Above 1 KC(T)/T3 increases rapidly to a maximum at about 5 K, decreasing more gradually at higher temperatures, in a way that resembles other a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in binuclear transition-metal complexes bridged by imidazolate, benzimidazolate, biimidazolate, and bibenzimidazolate ionsMuin S. Haddad and David N. HendricksonCite this: Inorg. Chem. 1978, 17, 9, 2622–2630Publication Date (Print):September 1,…
Abstract Spatial patterns of dry matter, nitrogen, and organic carbon were investigated for velvet mesquite [ Prosopis juliflora (Swartz)] DC and for palo verde [ Cercidium floridum Benth.] ecosystems in the Upper Sonoran Desert of Arizona. Standing understory vegetation and litter originating from the overstory shrub…
An experimental study was carried out to investigate the influence of molecular weight distribution on stretchability and thread nonuniformity of high-density polyethylene monofilaments. For the study, a melt-spinning/multistage stretching device was constructed, and the monofilaments were extruded first into a quench…
The measurement of the response of Mg2SiO4 : Tb thermoluminescent dosimeter against radiation dose has been made and the result is presented. The supralinearity observed is characterized by (1) a clear power-law relation between the response and the dose and (2) a sharp transition from the linear to the supralinear re…
Hard magnetic properties of Alnico 5 are very sensitive to the applied cooling rate under a magnetic field. A new experimental device has been designed, which allows to cool samples at a constant speed in the gap of an electromagnet. Cooling rates can be varied from 5°C/min. to 170°C/min, and the magnetic field can be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of Silane Coupling Reactions. 1. Reaction of Trimethylmethoxysilane and Triethylsilanol Studied by Gas-Liquid ChromatographyP. DreyfussCite this: Macromolecules 1978, 11, 5, 1031–1036Publication Date (Print):September 1, 1978Publication History Published online1 Ma…