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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrosion in Fertilizer Equipment, Corrosion of Metals by Liquid Mixed FertilizersJ. D. Hatfield, A. V. Slack, G. L. Crow, and H. B. Shaffer Jr.Cite this: J. Agric. Food Chem. 1958, 6, 7, 524–531Publication Date (Print):July 1, 1958Publication History Published online1 May 2…
An investigation was made of the effect of TiO 2 on the glassforming region and on the physical properties of glasses in the system Na 2 O‐B 2 O 3 ‐SiO 2 TiO 2 . Glasses containing up to 45 mole % TiO 2 may be formed with an alkali content of 30 mole %. At lower alkali contents (10 mole % Na 2 O) glasses may be formed…
The effective range theory is developed for electron-hydrogen scattering. The scattering length as and the effective range r0s of the singlet state are determined by making use of the accurate solution of the H− ion states, as as = 7.03, r0s = 3.37 (in atomic unit). The scattering length at and the effective range r0t…
An account is gven of the theories of intrinsic dielectric breakdown in solids, with particular emphasis on the physical process envisaged by each theory. Theories of the modified form of thermal breakdown which occurs in impulse testing are also discussed. (W.D.M.)
Abstract Es wird die thermische Stabilität der Phasen im System Gallium/Schwefel bis zu Temperaturen von 1300°C untersucht. Ga 2 S 2 zerfällt vom Schmelzpunkt 970°C ab nach wobei Ga 2 S im Temperaturgebiet von 970 bis 1200° C absublimiert. Kristallines Gallium(I)‐sulfid Ga 2 S disproportioniert oberhalb 950° C in Ga 2…
A method of electron phase microscopic observation is described which offers greater image contrasts for specimens possessing small phase differences than is possible with conventional methods of electron microscopic observation. It is shown that observation by dark contrast image using a phase plate, consisting of ma…