Aumento de la producción de cemento y mejora simultánea de la calidad (continuación)
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Avantages de l'emploi du broyeür vibrant en céremique fine
El empleo de molino vibrante permite reducir en 50-60ºC la temperatura de cocción, reducir la tendencia al agrietamiento del vidriado y conseguir que éste sea más opaco.
Steine für doppelsohalige wände
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Magnetic Granulometry and Super-Paramagnetism
The magnetic technique of particle size measurement based on the work of Elmore consists of a comparison of a modified Langevin curve with the observed magnetization curve for an appropriate system of ferromagnetic particles. The average magnetic moment per particle is obtained from this analysis, and the average part…
Inclusion complexes of faujasite with paraffins and permanent gases
Abstract An investigation has been made of occlusion of O2, A and N2, and of CH4, C2H6, C3H8, n- and iso-C4H10, n-, iso- and neo-C5H12, n-C6H14, n-C7H16, n-C8H18 and iso-C8H18 within the crystal lattice of dehydrated synthetic faujasite (Na2O. Al2O3. 2·67SiO2. mH2O). The three permanent gases are selectively occluded…
The absorption spectra of irradiated diamonds after heat treatment
Abstract The absorption spectra of eight type I and three type IIa diamonds irradiated with neutrons, electrons or y-rays have been recorded at 80 and 290°K after various heat treatments in the temperature range 0 to 900°C. It is found that heating in the range 350 to 450°C causes a general reduction in the irradiatio…
The Measurement of Magnetostriction by means of Strain Gauge
For the purpose of studying the relation of magnetostriction to technical magnetization, we used a strain gauge to measure the magnetostriction of long rod single crystals of 3.2% Si-Steel, and compared the results with those which had formerly been obtained on the same samples by using a mechano-optical lever. The la…
Interpretation of the Low-Temperature Thermal Conductivity of Graphite
The experimental data observed by Smith and Rasor in measuring the low-temperature thermal conductivity of several types of graphites are interpreted on the basis of a two-medium theory. The theory assumes that, in the artificial polycrystalline graphites, the nongraphitic regions are isotropic thermal conductors and…
On the Magnetic Moment andg-Value of Complex Ions
Magnetic properties of complex salts containing paramagnetic ions of transition elements are studied on the crystalline field model. Strong cubic crystalline field splits d -orbital into d γ and d ε , and the magnetism is due to incomplete d ε shells. The crystalline field is assumed to have, besides cubic part, a com…
Crystal Structure of Ferromagnetic Nickel Oxide
The determination of crystal structure was performed on the ferromagnetic nickel oxide obtained by the flame fusion method. Apart from a slight deviation of axial angle from 90°, it has a defect tetragonal structure belonging to the space group I 4 1 / amd ( D 4 h 19 ), the lattice constants being a =5.899 6 kX. and c…
Observed Dependence of the Low-Temperature Thermal and Electrical Conductivity of Graphite on Temperature, Type, Neutron Irradiation, and Bromination
The thermal conductivity of various graphites in the temperature interval 10\ifmmode^\circ\else\textdegree\fi{} to 300\ifmmode^\circ\else\textdegree\fi{}K has been determined and the effect of neutron irradiation and bromination investigated. The thermal conductivity of large crystallite natural graphite and of nonpit…
Thiourea, a New Ferroelectric
Received 19 September 1956DOI:https://doi.org/10.1103/PhysRev.104.1191©1956 American Physical Society
Magnetic Structures of the Polymorphic Forms of Manganous Sulfide
Manganous sulfide exists in three polymorphic forms. There are two cubic modifications, $\ensuremath{\alpha}$-MnS having the rock salt structure and $\ensuremath{\beta}$-MnS with the zinc blende structure. The third form is hexagonal $\ensuremath{\beta}$-MnS with the wurtzite structure. The magnetic susceptibilities o…
Magnesium Polymetaphosphate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnesium PolymetaphosphateR. Pfanstiel and R. K. IlerCite this: J. Am. Chem. Soc. 1956, 78, 21, 5510–5511Publication Date (Print):November 1, 1956Publication History Published online1 May 2002Published inissue 1 November 1956https://pubs.acs.org/doi/10.1021/ja01602a014https…
Crystallographic Data. 139. 2-Amino-2-methyl-1,3-propanediol
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallographic Data. 139. 2-Amino-2-methyl-1,3-propanediolH. A. Rose and Ann. Van CampCite this: Anal. Chem. 1956, 28, 11, 1790–1791Publication Date (Print):November 1, 1956Publication History Published online1 May 2002Published inissue 1 November 1956https://pubs.acs.org/…
Studies on the Chemistry of Halogens and of Polyhalides. IX. Electrical Conductance Study of Higher Polyiodide Complex Ions in Acetonitrile Solutions1,2
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on the Chemistry of Halogens and of Polyhalides. IX. Electrical Conductance Study of Higher Polyiodide Complex Ions in Acetonitrile Solutions1,2Alexander I. Popov, Ralph H. Rygg, and Norman E. SkellyCite this: J. Am. Chem. Soc. 1956, 78, 22, 5740–5744Publication Date…
Beiträge zur Chemie des Schwefels. XXIX. Über die Darstellung von Rohsulfanen
Abstract Das Verfahren zur Darstellung des als Rohsulfan bezeichneten, aus Na 2 S x −Lösungen mit Salzsäure zu erhaltenden Sulfangemisches wurde weiter entwickelt mit dem Ziele, laufend größere Mengen des Öles im Laboratorium zu gewinnen. Der Einfluß verschiedener Faktoren auf die Ausbeute und auf die Zusammensetzung…
The tensile strengths of viscous liquids under dynamic loading
Under similar conditions of transient loading the cavitation thresholds of syrup and olive oil are 130 × 10 6 dyne/cm 2 and 29 × 10 6 dyne/cm 2 respectively. For fluids with a viscosity (η) in the range 0.01 to 400 P the cavitation threshold pressure P c is given by the empirical relation P c = κη 0.2 . This result ca…
Die gewellte Struktur des Antigorits, I
Minerals of the serpentine family are essentially divisible into two groups: chrysotile and antigorite types (the latter includes antigoritieal serpentines). Throughout, they are two-layer minerals. Their layers are formed by combining of a Si 2 O 5 layer and a brucite [ Mg ( OH ) 2 ]-like layer. The chemical formula…
Bemerkungen zur Systematik der Kristallstrukturen von Silikaten mit hochkondensierten Anionen
Article Bemerkungen zur Systematik der Kristallstrukturen von Silikaten mit hochkondensierten Anionen was published on November 1, 1956 in the journal Zeitschrift für Physikalische Chemie (volume 206O, issue 1).