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The secondary emission electron multiplier is chosen to illustrate the phenomenon of ‘cascade multiplication’. A method is given for deriving the semi-invariants of the probability distribution for the number of output electrons after any number of identical stages of multiplication, in terms of the corresponding semi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifferential Heats of Adsorption of Nitrogen on Carbon BlacksL. G. Joyner and P. H. EmmettCite this: J. Am. Chem. Soc. 1948, 70, 7, 2353–2359Publication Date (Print):July 1, 1948Publication History Published online1 May 2002Published inissue 1 July 1948https://pubs.acs.org/d…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn Email Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation R. A. Humble; Cathodic Protection of Steel in Sea Water With Magnesium Anodes. CORROSION 1 July 1948; 4 (7)…
A bstract Some evidence leading to the supposition that certain borosilicate glasses containing a high percentage of silica are made up of two‐component glasses is presented. One of these components, which consists mainly of silica and has a low expansivity, forms a rigid network throughout the body of the glass while…
Abstract Da das magnetische Moment der Elektronen mit einem mechanischen Drehimpuls verknüpft ist, muß die Verteilung der Magnetisierungsvektoren in einer bewegten Wand zwischen zwei Weißschen Bezirken sich von derjenigen in der gleichen Wand in Ruhe etwas unterscheiden. Der Energieinhalt der bewegten Wand ist deshalb…
The pulse method has been applied to measure mechanical properties of NaCl, KBr, and KCl at 10 and 30 Mc/sec. The elastic constants of KBr have been measured in the low temperature region. The strain-optical constants have been measured by a traveling-wave method suggested by Mueller.
The spectral emissivity, the temperature scale, and the electron work function of chromium have been determined. The emissivity is found to be 0.334 for a wave-length of 6690A and the value found for the electron work function is 4.60 volts with an $A$ for Richardson's equation of 48 amp/${\mathrm{cm}}^{2}$/${\mathit{…
The stability of duplex films of hydrocarbon oils containing spreaders is discussed in this paper. Duplex films containing spreaders of high molecular weight and of complex nature, e.g. stand oil, eucalyptus residue, polymerized oleic acid, may remain spread for long periods but are thermodynamically metastable. The p…
Typical problems of the theory of perfectly plastic materials are discussed for the example given by the structure shown in Fig. 1. A simple graphical representation is developed which facilitates the study of the states of and residual produced by slowly varying the load. For monotonically increasing load, three doma…
1. Various aspects of the process of calcification have been studied in several marine molluscs. 2. Calcification of the shell is brought about by the formation of an organic matrix upon which minute granules of calcium phosphate are deposited. 3. In the presence of, and in contact with the mantle epithelium, crystal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanical Properties of Substances of High Molecular Weight. IV. Rigidities of Gelatin Gels; Dependence on Concentration, Temperature and Molecular Weight1John D. FerryCite this: J. Am. Chem. Soc. 1948, 70, 6, 2244–2249Publication Date (Print):June 1, 1948Publication Histor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDouble Fluorides of Potassium or Sodium with Uranium, Thorium or LanthanumW. H. ZachariasenCite this: J. Am. Chem. Soc. 1948, 70, 6, 2147–2151Publication Date (Print):June 1, 1948Publication History Published online1 May 2002Published inissue 1 June 1948https://pubs.acs.org/…
Summary Solubility data are provided and collected for the pure sodium and potassium soaps. Hydrolysis obscures the temperatures of solution but is obviated by the presence of a small excess of alkali. Each sodium soap has a large range of temperature between fair and high solubility, whereas the potassium soaps go ab…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-Ray Diffraction Studies of Systems Involved in the Preparation of Alkaline Earth Sulfide and Selenide Phosphors1William Primak, Herman Kaufman, and Roland WardCite this: J. Am. Chem. Soc. 1948, 70, 6, 2043–2046Publication Date (Print):June 1, 1948Publication History Publis…
Single crystals of BaTi${\mathrm{O}}_{3}$ have been grown and investigated by means of the polarization microscope, x-ray diffraction, and their dielectric and piezoelectric response. It has become possible to see the domains in the ferroelectric state and to change their number, size, and orientation. Wall displaceme…
Phosphorescence and thermoluminescence emission from photoconducting impurity activated phosphors have been satisfactorily explained by the storage of electrons, freed from luminescence centres or other atoms of the solid, in metastable energy levels known as electron traps. Electrons escaping from these traps give ri…
Abstract The Becker-Kersten treatment of domain boundary movements is widely applicable in the interpretation of magnetization curves, but it does not account satisfactorily for the higher coercivities obtained, for example, in permanent magnet alloys. It is suggested that in many ferromagnetic materials there may occ…
SUMMARY: Equipment can be readily made in the laboratory for the mechanical preparation of roll-tubes. Roll-tubes so prepared can largely replace Petri dishes both for counting and for single colony isolations.
A summary is given of the theory of pulsation of a stationary gas globe in an infinite incompressible fluid. If three parameters appearing in the formulation are selected by fitting the equations to three independent experimental results, it is shown that the theory fits the remaining experimental results and can be u…
The various shapes of nuclear induction signals are discussed for small values of the r-f field. In the case of a linear variation with time of the strong magnetic field, numerical results are given for various values of the sweep rate and the total relaxation time.