Las mazorcas de maíz como agregados para bloques de hormigón
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Hormigón superior sin granulometría precisa de los agregados
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A Study of Magnetic Viscosity
A general analysis of magnetic viscosity based on activation energy concepts is given. A particular case is considered of the application of the theory to the phenomenon occurring in materials in which bulk magnetization proceeds by the rotational movement of the vectors of single domains, which process, according to…
Determination of Electronic Structure of Molecules from Nuclear Quadrupole Effects
Nuclear quadrupole coupling constants in molecules depend on the nuclear quadrupole moments and the variation in electrostatic field at the nucleus. It is shown that this variation of electric field is usually simply related to the molecular electronic structure, being primarily dependent on the way in which valence e…
The Dynamics of Cavitation Bubbles
Abstract Three regimes of liquid flow over a body are defined, namely: (a) noncavitating flow; (b) cavitating flow with a relatively small number of cavitation bubbles in the field of flow; and (c) cavitating flow with a single large cavity about the body. The assumption is made that, for the second regime of flow, th…
The dissociation energy of the N-N bond in hydrazine
Abstract The thermal decomposition, of hydrazine was investigated over a temperature range of 630 to 780°C and at pressures of a few mm. Hg. The experiments were carried out in a flow system, toluene being used as a carrier gas. This technique makes it possible to discriminate between the heterogeneous decomposition o…
The diffraction of X-rays by distorted-crystal aggregates. II. Diffraction by bent lamellae
The apparent particle size of distorted crystallites varies from independence of θ and λ (particle-size broadening) to proportionality with λ cosec θ (distortion broadening) as the parameter Eη sin θ/λ increases, where E is a particle size and η is an average strain. For a bent `orthorhombic' lamella of thickness T wi…
X-ray diffraction by random layers: ideal line profiles and determination of sructure amplitudes from observed line profiles
Warren's calculation of the line profile for diffraction from random layers depends on the use of an approximation function. This can be. avoided, and expressions found for (a) the ideal line profile for slow variation of the structure amplitude, and (b) the variation of the intensity of diffraction as a function of p…
The crystal and molecular structure of naphthalene. I. X-ray measurements
A comprehensive X-ray investigation of the crystal structure of naphthalene is described, in which all the reflexions that lie within the reach of Cu Kα radiation have been examined. Moving-film photographic methods and visual estimates of intensities by independent observers were employed. From the results a total of…
X-ray diffraction by randomly oriented line gratings
This paper contains a calculation of the X-ray diffraction pattern to be expected from a randomly oriented assemblage of line gratings. A line grating is defined as a periodic linear structure, most generally represented by a chain of similarly oriented and uniformly separated unit cells arranged along a straight line…
Eindimensionale Fehlordnung in Kristallen und ihr Einfluss auf die Röntgeninterferenzen. I. Berechnung des Fehlordnungsgrades aus den Röntgenintensitäten
The general theory is developed of X-ray scattering by crystals showing order in two translation directions but disorder in the third direction, the treatments previously published having proved inadequate for the interpretation of some single-crystal observations of the author. The solution of the problem is affected…
On the Effect of the Field Reactions on the Interaction of Mesotrons and Nuclear Particles. IV
Progress of Theoretical Physics Vol. 3 No. 1 (1948) pp. 26–37 On Wentzel's Method in the Meson Theory Tatuoki Miyazima, Takao Tati and Sin-itiro Tomonaga Progress of Theoretical Physics Vol. 6 No. 5 (1951) pp. 815–828 On the Adiabatic Nuclear Potential, I Kazuhiko Nishijima Progress of Theoretical Physics Vol. 10 No.…
The Phosphorescence Decay of Halophosphates and Other Doubly Activated Phosphors
The decay rates of three doubly activated phosphors, namely, calcium halophosphate (Mn, Sb), calcium silicate (Mn, Pb), and zinc fluoride (Mn, Ti, or W) have been investigated under λ2537 excitation. The halophosphates studied all show initially a very rapid and abrupt decay, followed by a second stage of decay having…
Optical Properties of Calcium Silicate Phosphors
Calcium silicate phosphors activated with varying amounts of manganese luminesce yellow to orange under cathode-ray excitation, but are not excited by ultraviolet λ2537. If a small amount of lead is added with the manganese, the resulting material responds to λ2537 to give the same color as that produced by cathode ra…
The Mutual Habit Modification of Sodium Chloride and Dipolar Ions
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Mutual Habit Modification of Sodium Chloride and Dipolar IonsCharles P. Fenimore and Arthur. ThrailkillCite this: J. Am. Chem. Soc. 1949, 71, 8, 2714–2717Publication Date (Print):August 1, 1949Publication History Published online1 May 2002Published inissue 1 August 1949h…
Preparation and Use of Tritium and Deuterium Targets
Methods are described for preparing Ta–H and Zr–H targets for economic use of tritium. Ratios of hydrogen isotope to metals of about 1.0 were obtained. The use of these targets under deuteron bombardment is discussed.
Dielectric Relaxation of Molecules Containing Rotating Polar Groups
Debye's theory of dielectric relaxation has been extended to molecules consisting of two similar polar groups, which cannot rotate freely relatively to one another owing to their mutual potential energy. As a result, the mean dipole moment of the molecule in the field F0 exp(iωt) can be expressed by a sum of terms of…
Degradation and Stabilization of Polyvinyl Chloride
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDegradation and Stabilization of Polyvinyl ChlorideV. Warren Fox, J. G. Hendricks, and H. J. RattiCite this: Ind. Eng. Chem. 1949, 41, 8, 1774–1779Publication Date (Print):August 1, 1949Publication History Published online1 May 2002Published inissue 1 August 1949https://pubs…
Über eine Verbesserung der additiven Berechnung von Verbrennungswärmen und der Berechnung der Mesomerie‐Energie aus Verbrennungswärmen
Abstract Die additive Berechnung der Verbrennungswärme organischer Verbindungen wurde weitgehend verbessert und erreicht nunmehr bei aliphatischen und einfachen alicyclischen Kohlenwasserstoffen eine Genauigkeit von ± 0.5 (z. Tl. sogar ± 0.2)/100 der Gesamtverbrennungswärme. Die neuen Verbrennungswerte der verschieden…
Dependence of tensile strength of vulcanized rubber on degree of cross‐linking
Abstract Tensile strengths of natural rubber samples quantitatively crosslinked with decamethylene dis‐methyl azodicarboxylate have been determined. The proportion of the azo vulcanizing agent was varied 80‐fold, the fraction p of cross‐linked units in the products ranging from 0.10x 10 −2 to 8.0 x 10 −2 . In spite of…