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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…
In this preliminary series of experiments, calcium sulphate dihydrate has been allowed to crystallize spontaneously from solutions of varying degrees of supersaturation, and induction periods and rate constants have been determined. The effect of crystal area, pH, and accelerators and retarders on this process has bee…
Abstract Bei der spontanen Polymerisation des Phenylisocyanids bei Raumtemperatur entsteht neben Harzen ein blauer Farbstoff, der isoliert und als Indigo‐dianil erkannt wurde. Substituierte und homologe aromatische Isocyanide liefern, wenn überhaupt, nur Spuren analoger Farbstoffe. Der Mechanismus dieser neuen, einfac…
Abstract In this paper the influence of different molecular parameters on the dielectric characteristics of amorphous high polymers has been examined. The dielectric behaviour has been compared for several polymers which carry the same dipole in the side chain, but which differ in the flexibility of the main chain (po…
An investigation has been made into the variation in shape of the loadelongation curve of undrawn polyhexamethylene adipamide (nylon 6.6) filaments with change in ambient conditions, isotropic refractive index of the undrawn filament and speed of extension at low speeds of extension (0.008cm/sec–0.43cm/sec). The inter…
A method of growing gray tin single crystals from a liquid amalgam is presented together with a description of the apparatus and specification of the conditions of growth. Photographs of typical crystals ranging in size up to 2 cm and showing well-developed crystallographic planes are included. Residual resistance mea…
A thermodynamic study of the uranium-oxygen system, primarily in the single phase region UO2–UO2.20, has been made at temperatures of 1150° to 1350°K. An electrochemical technique was used to obtain emf measurements on uranium oxide half-cells. The cells were of the type Fe, FeO|(ZrO2+CaO)|UO2+x, Pt where x varied fro…