Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
P. A. Barrett, R. P. Linstead, G. A. P. Tuey and J. M. Robertson, J. Chem. Soc., 1939, 1809 DOI: 10.1039/JR9390001809
J. Chatt and F. G. Mann, J. Chem. Soc., 1939, 1622 DOI: 10.1039/JR9390001622
The Zeeman effects of the principal series lines of sodium and potassium in the range $n=10 \mathrm{to} 35$ are observed in absorption, using the new 60-inch cyclotron magnet. With a field of 27,000 gauss, the lines having $n$ in the neighborhood of ten show a normal triplet representing the complete Paschen-Back effe…
Certain types of electrostatic fields may be used as lenses to focus electron beams. The theory of these lenses is developed for electric fields that are symmetrical about a central axis. The introduction of two velocity functions exactly reduces the partial differential equations of electron motion to a series of ord…
The thermal conductivity K is derived in terms of the difference in temperature which, in the steady state, is set up between the axis and the surface of a rod or tube of the material when the latter is electrically heated in an evacuated enclosure. The electrical conductivity σ is derived in the course of the same ex…
G. S. Hartley and R. J. W. Le Fèvre, J. Chem. Soc., 1939, 531 DOI: 10.1039/JR9390000531
R. W. Gurney and N. F. Mott, Trans. Faraday Soc., 1939, 35, 69 DOI: 10.1039/TF9393500069
The first page of this article is displayed as the abstract.
The authors have continued their efforts to absolve the x-ray method of determining the electronic charge of the criticism that Bragg reflection determines the lattice dimensions in only a very shallow surface region whereas the density determinations have been made on a much larger volume of crystal. In earlier work…
Oscillographic studies have been made of the currents in negative point to plane coronas in air. The oscillograms obtained indicate that the negative corona current is composed of discrete pulses whose magnitude and frequency have a definite relationship to the corona current, point size and gas pressure. The frequenc…
described the isolation of water-soluble peptides from the brown alga Pelvetia canaliculata forma libera S. M. Baker and the red alga Corallina officinalis Lirn. It was then suggested that the presence of peptides in algae was due to a lack of metabolic balance determined either by desiccation or by low illumination.…
The paths of charged particles traversing a portion of an ideal spherical condenser are worked out. The section of the condenser considered is bounded by two rays, enclosing an angle $\ensuremath{\Phi}$, from the common center of curvature, $O$, of the equipotential surfaces. It is shown that a group of particles, hom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen Bonds Involving the C-H Link. V. The Solubility of Methylene Chloride in Donor SolventsM. J. Copley, G. F. Zellhoefer, and C. S. MarvelCite this: J. Am. Chem. Soc. 1938, 60, 11, 2714–2716Publication Date (Print):November 1, 1938Publication History Published online1…
X-ray diffraction patterns of water were obtained at five temperatures: 1.5°, 13°, 30°, 62°, and 83°C. The radiation was Cu Kα and Mo Kα, monochromated by reflection from a rocksalt crystal. Radial distribution curves for water at the five temperatures were obtained by a Fourier analysis of the x-ray intensity curves.…
Crystal structure analysis shows there can be no further doubt regarding the existence of the carbonate apatite or oxy-apatite molecules. Chemical analysis is given of the dahllite from Mouillac, France, upon which x-ray measurements were made.
The effects of temperature and of heat treatment on Pyrex chemically resistant glass have been studied by measuring the rate of diffusion of helium and of hydrogen through a tube of about one millimeter wall thickness. Measurements were made with helium between 180°C and 590°C, and with hydrogen at 512°C. The influenc…
Measurements were made of the heats of combustion of one artificial graphite, two natural graphites, and two samples of diamond. The bomb calorimeter used was calibrated electrically and by means of benzoic acid. The amount of reaction in each combustion experiment was determined from the mass of carbon dioxide formed…
An apparatus is described which may be used for x-ray diffraction work on substances under pressures up to 5000 atmospheres. The compressive medium is helium gas. A small (2.5 cm radius) Debye-Scherrer type camera is used. The camera, complete with film and specimen, was placed inside the high pressure chamber. The x-…
According to their atomic arrangement the minerals found in clays can be divided into the two-layer and the three-layer structures. The members of the first group have alternating silica and alumina layers, e.g. kaolinite; the members of the second group have one alumina (or magnesium or iron) layer between two silica…
The empirical similarity in the behavior of scattering-factor curves for different atoms is used to replace the structure-factor formulae by an approximating system. This system is shown to lead to $m'\mathrm{th}$ degree algebraic equations, designated fundamental equations, whose coefficients are calculable in terms…