«Cement plant power». La energía en las fábricas de cemento
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Ensayos de cocinas españolas
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Empleo del bloque de yeso en la determinación de humedad en las postas de cemento. (l)
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Potential Energy Functions for Graphite
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…
Staining of Tissue Sections for Electron Microscopy with Heavy Metals
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…
Polarization of Bremsstrahlung from Polarized Electrons
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…
Ferroelectricity in Di-Glycine Nitrate(NH2CH2COOH)2·HNO3
${(\mathrm{Glycine})}_{2}$\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…
A neutron structure analysis of tetragonal NH4(H2PO4)
The structure of tetragonal NH4H2PO 4 has been determined in a single-crystal neutron-diffraction study. The N-If
The Role of Metal Oxides as Activators of Vulcanization
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…
Composition of Crude Fiber in Certain Roughages
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…
Melting and Glass Transitions in Polyisobutylene
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…
Corrosion in Fertilizer Equipment, Corrosion of Metals by Liquid Mixed Fertilizers
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…
Glass Formation and Properties of Glasses in the System Na 2 O‐B 2 O 3 ‐SiO 2 ‐TiO 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…
Low Energy Electron-Hydrogen Scattering
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…
Dielectric breakdown in solids
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.)
Thermische Untersuchungen an Sulfiden. II. Das thermische Verhalten der Sulfide des Galliums
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…
Experiment on the Electron Phase Microscope
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…
THE CRYSTALLIZATION OF CALCIUM SULPHATE DIHYDRATE
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…
Über die spontane Polymerisation des Phenylisocyanids; ein neuer Weg in die Indigo‐Reihe
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…