The crystal structure of magnesium chloride dodecahydrate, MgCl2.12H2O
Magnesium chloride dodecahydrate crystallizes in the monoclinic space group P21/c with unit-cell dimensions a= 8.59, b= 14-40, c= 8.75 A, fl= 129"6 , D~= 1.241 g.cm-3, Z=2.
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Ionic Conductivity in Calcium Silicate Glasses
Glasses in the system CaO–SiO 2 were prepared with the composition varying from 40 to 55 mole % CaO. The Na 2 O impurity content ranged from 0.01 to 1.30 mole %. The electrical resistivity was insensitive to the Na 2 O content but decreased with increasing CaO concentration. The activation energy for conduction ranged…
The Influence of Sheet Thickness on Crack Propagation
THE influence of the sheet thickness on fatigue‐crack propagation was studied on specimens of 2024‐T3 alclad sheet of five thicknesses, viz. 0.6, 1, 2, 3 and 4 mm. It turned out that cracks grow faster in thicker sheets. The different states of stress at the crack tip probably cause the thickness effect.
Absorption Spectrum of Mn2+ in KCl
The absorption spectrum of an Mn2+-doped KCl crystal has been measured at room temperature. The observed bands are assigned as transitions from the 6A1(S) ground state to various excited quartet levels of a Mn2+ ion in a cubic crystalline field. The observed band energies are fitted with four parameters B, C, Dq, and…
Ether alcohol sulfates. The effect of oxypropylation and oxybutylation on surface active properties
Abstract The reaction of 1,2‐butylene oxide with fatty alcohols of 12 to 18 carbon atoms was investigated and products were compared with those from the propylene oxide reaction. A 60% yield of the first derivative was obtained for the butylene oxide reaction compared with a maximum yield of 50% for the propylene oxid…
The Isolation and Characterization of Malate-Lactate Transhydrogenase from Micrococcus lactilyticus
Abstract The malate-lactate transhydrogenase of Micrococcus lactilyticus has been purified and found to be a colorless protein with a molecular weight of approximately 99,000. The enzyme catalyzes the transfer of hydrogen from 3- and 4-carbon straight chain l-α-hydroxy acids to α-keto acids. The reactions catalyzed ar…
Magnetic domain structure, eddy currents and permeability spectra
A theory of the eddy-current-limited complex permeability of ferromagnetic sheet is presented that takes account, for the first time, of the rotational permeability of domain interiors as well as wall motion. Models with contrasting domain structure are investigated; these are found to behave similarly when the domain…
Localized Magnetic Moments in Mn4N
The temperature dependence of sublattice magnetizations and the specific heat due to magnetic ordering of Mn 4 N were measured in order to study the origin of the anomalous thermomagnetic curve of the compound. The observed magnetization-temperature curves of two sublattices are more convex upwards than those of norma…
Strengthening of Glass Surfaces by Sulfur Trioxide Treatment
Removal of soda from a glass surface at high temperature can, on cooling, give appreciable strengthening due to lowering of the expansion coefficient at the surface. Soda depletion has been accomplished previously by treating a high‐expansion soda‐lime glass with SO 2 in the presence of oxygen and water. The depletion…
Elastic Properties of NiTi as a Function of Temperature
Young's modulus, shear modulus, and internal friction of the intermetallic compound NiTi have been measured as a function of temperature from about −180° to 600°C, in the kilocycle-per-second range. Annealed and cold-worked specimens were used. All the specimens showed the same general pattern, with a minimum in elast…
Copolymerization of styrene and methyl methacrylate. Reactivity ratios from conversion–composition data
Abstract A method for the determination of reactivity ratios from conversion–composition data has been outlined. The conversion–composition changes during the copolymerization of styrene (M 1 ) and methyl methacrylate (M 2 ) have been studied at 60°C. By a method of graphical intersection, the integrated form of Skeis…
Electron Diffraction at Low Temperature IV. Amorphous Films of Iron and Chromium Prepared by Low Temperature Condensation
Films of iron and chromium were prepared at 4.2°K which show diffuse halo electron diffraction patterns characteristic of an amorphous state. In order to decide whether these films are in an amorphous state or consist of very fine crystallites, the radial distribution analysis was carried out for them. The results of…
The crystal structure of the room temperature modification of indium chloride, InCl
The yellow crystals of the room-temperature modification of indium chloride, InCl, are cubic with a = 12.368 + 0.001/~.
The crystal structure of Tutton's salts. V. Manganese ammonium sulfate hexahydrate
The crystal structure of manganese ammonium sulfate hexahydrate, Mn(NH4)2(SO4)2.6H20,has been determined by a three-dimensional X-ray analysis with Fe Ke radiation (2 = 1.9373A).The crystals are monoclinic, space group P21/a, with 2 molecules per unit cell.The cell dimensions are a= 9"40, b = 12.74, c= 6.26 A, fl= 107…
Continuous Degenerate Representations of Noncompact Rotation Groups. II
Three principal continuous series of most degenerate unitary irreducible representations of an arbitrary noncompact rotation group SO(p, q) have been derived and their properties discussed in detail. The corresponding harmonic functions have been constructed.
The Synthesis and Physical Properties of Some Organo- and Organosiloxysilicon Phthalocyanines
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Synthesis and Physical Properties of Some Organo- and Organosiloxysilicon PhthalocyaninesJohn N. Esposito, John E. Lloyd, and Malcolm E. KenneyCite this: Inorg. Chem. 1966, 5, 11, 1979–1984Publication Date (Print):November 1, 1966Publication History Published online1 May…
Thermal Degradation of Isotactic and Syndiotactic Poly(methyl methacrylate)1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Degradation of Isotactic and Syndiotactic Poly(methyl methacrylate)1H. H. G. Jellinek and Ming Dean LuhCite this: J. Phys. Chem. 1966, 70, 11, 3672–3680Publication Date (Print):November 1, 1966Publication History Published online1 May 2002Published inissue 1 November…
Magnetic behaviour of single-domain particles
The magnetization, magnetostriction and magnetoresistance of a randomly oriented assembly of single-domain particles have been calculated as a function of magnetic field. The particles are assumed to have either cubic or uniaxial anisotropy and the calculations extend over a much greater range of field strengths than…
Vibrations of Circular Cylindrical Shells of Piezoelectric Silver Iodide Crystals
Solutions for the flexural and axisymmetric vibrations of piezoelectric cylindrical shells of the crystal class 6mm are investigated. Applying suitable mechanical and electrical boundary conditions, the frequency equations have been obtained.
Optical Constants of Incandescent Refractory Metals
Filaments of semicircular cross section (diam 0.25–0.32 mm) were mounted in bulbs with plane windows. Chopped plane-polarized radiant flux was reflected from the flat surface, then passed through an analyzer whose plane of polarization made a 45° angle with the plane of reflection at the filament. The orientation of t…