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Neutron diffraction intensities have been computed for antiferromagnetic spin arrangements in the rock-salt-type structure. If the spin directions in the unit cell occur at relative angles other than 0\ifmmode^\circ\else\textdegree\fi{} or 180\ifmmode^\circ\else\textdegree\fi{}, the neutron scattering from powder spec…
Abstract Passivity in the transition metal alloys occurs at specific critical compositions which appear to be related to d ‐electron vacancies in the component metals and their tendency to fill with electrons. The d vacancies, measured in part by the magnetic saturation moment, favor formation of strongly chemisorbed…
Calcium aluminate glasses containing alkali oxides and iron oxide will transmit infrared radiation to about 6 μ and still have satisfactory working properties. Their refractive index, density, expansion, Young's modulus, modulus of rupture, fracture velocity, Knoop hardness, and some electrical and chemical properties…
Abstract The Griffith-model of brittle fracture of elastic solids and the model by Irwin and Orowan for the brittle fracture of elastic-plastic solids predict the propagation of cracks on the basis of energy supplied by the work of externally impressed forces and by the change of strain energy. Previous discussions ha…
SUMMARY: Poly-β-hy droxybutyrate has been previously shown to be a major component of bacterial ‘lipid’ granules. In the present study, the conditions under which it was formed and degraded by Bacillus cereus and B. megaterium were studied in washed suspensions. Suitable substrates for synthesis were glucose, pyruvate…
SUMMARY: Treatment of the cells of various Bacillus spp. with an alkaline solution of sodium hypochlorite resulted in dissolution of the cells and liberation of the intracellular lipid inclusion bodies. Analyses of the isolated and purified inclusions of Bacillus cereus grown under a variety of cultural conditions sho…
Electron transmission micrographs of polycrystalline aluminium quenched from ∼ 600°c into iced brine show that the specimens contain many dislocation loops with diameters of the order of several hundred Å. Some of the loops are hoxagonal in shape, and occur on (111) planes, and have a Burgers vector ½ [110] not in the…
In the frame-work of the crystalline field theory, the excited states of Cr 3+ in Al 2 O 3 and the optical transitions to these states are studied taking into account the effect of trigonal field and spin-orbit interaction. Initial splittings and optical anisotropies of the broad band (transitions to quartet states) a…
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Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation A. D. Crowell; Potential Energy Functions for Graphite. J. Chem. Phys. 1 August 1958; 29 (2): 446…
Heavy metals may be incorporated from solution into tissue sections for electron microscopy. The resulting increase in density of the tissue provides greatly enhanced contrast with minimal distortion. Relative densities of various structures are found to depend on the heavy metal ions present and on the conditions of…
We analyze the polarization of bremsstrahlung emitted from polarized electrons, in the Born approximation. Spins of the final electron are summed over. Differential cross sections are given, and are integrated over final electron directions. The results are valid for all electron energies, subject only to the limitati…
${(\mathrm{Glycine})}_{2}$\ifmmode\cdot\else\textperiodcentered\fi{}${\mathrm{HNO}}_{3}$ is ferroelectric below -67\ifmmode^\circ\else\textdegree\fi{}C. The room-temperature phase is monoclinic, space group $\frac{P{2}_{1}}{a}$, with $a={9.49}_{6}$ A, $b={5.10}_{7}$ A, $c={9.35}_{0}$ A, $\ensuremath{\beta}=98.8\ifmmod…
The structure of tetragonal NH4H2PO 4 has been determined in a single-crystal neutron-diffraction study. The N-If
Abstract 1. The activation effect of metal oxides on the process of culvanization of nonpigmented compounds of rod polymerized sodium butadiene rubber differs from the effect in rodless polymerized rubber. In the latter case zinc oxide not only is not an activator but it retards the vulcanization process. 2. The role…
The lignin and cellulose contents of the dry matter of 11 roughages have been determined. These included two legume hays, five grass hays, oat straw, and oat silage made from plants harvested at the boot, milk, and dough stages of growth. The cellulose content of the grass hays and Korean lespedeza hay was higher than…
Abstract The purpose of this work was to investigate the crystallization behavior of uncompounded, unstressed polyisobutylene and butyl rubber. Glass transition data obtained during the work are also reported. The data were determined dilatometrically. The work was prompted by a literature survey which collected trans…