Mechanism of the Formation of Zinc Dendrites
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Equilibria and Eu2+ Luminescence of Subsolidus Phases Bounded by Ba[sub 3]MgSi[sub 2]O[sub 8], Sr[sub 3]MgSi[sub 2]O[sub 8], and Ca[sub 3]MgSi[sub 2]O[sub 8]
The incorporation of divalent europium in the compounds , , and produces phosphors of high luminescence yield. These phosphors respond well to both long and short wavelength ultraviolet excitation, as well as to cathode ray bombardment. The peak of the emission band occurs at progressively shorter wavelength and narro…
Aqueous systems at high temperature. Solubility to 200.degree. of calcium sulfate and its hydrates in sea water and saline water concentrates, and temperature-concentration limits
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAqueous systems at high temperature. Solubility to 200.degree. of calcium sulfate and its hydrates in sea water and saline water concentrates, and temperature-concentration limitsWilliam L. Marshall and Ruth. SlusherCite this: J. Chem. Eng. Data 1968, 13, 1, 83–93Publication…
Effect of Core Spray Cooling in Transient State after Loss of Coolant Accident
To examine the conditions brought about upon initiation of core spraying, a 36-rod assembly was heated to different temperatures and then spray cooled. The runs were made at atmospheric pressure using two kinds of assemblies, both made up of heater rods of 15 mm outer sheath diameter, arayed into 6×6 lattice accommoda…
Photoluminescent Efficiency of Phosphors with Electronic Transitions in Localized Centers
No general theory exists that can predict the efficiency of phosphors with electronic transitions in localized centers. In this paper a survey and discussion are given of the correlation between fluorescent properties and chemical properties, like composition and structure. Points of discussion are ( a ) choice of the…
Electrical and Optical Properties of Sputtered In2O3 films. I. Electrical Properties and Intrinsic Absorption
Abstract Thin films of n‐conducting In 2 O 3 are prepared by reactive sputtering. The concentration of conduction electrons is changed by a heat treatment between n e = 10 17 and 10 20 cm −3 ( T = 300°K). Concentration and temperature dependence of the electron mobility indicate an intense scattering at charged imperf…
On the Structures of Alkali Polyaluminates
Abstract Besides the so-called β-Al2O3 (R2O·11Al2O3; R=Na or K), there have been found two kindred compounds with approximate formulas, R2O·7Al2O3 (β′-Al2O3) and R2O·5Al2O3(β″-Al2O3). The structure determination of the latter two compounds was undertaken; the results are compared with the structure of β-Al2O3 in the p…
Solubilities of Magnesia, Titania, and Magnesium Titanate in Aluminum Oxide
On heat treatment in air the solubility of MgO or TiO 2 , in Al 2 3 is too small to detect by lattice parameter shifts. The solubility of MgTiO 3 in Al 2 O 3 in air increased to the measured values, expressed as atomic fractions Mg:A1or Ti:A1of0.82 × lo‐ 2 , 1.43 × 10 ‐2 , and 1.75 × 10 ‐2 at 1250°, 1650°, and 1850°C,…
Brillouin Scattering: Viscoelastic Measurements in Liquids
The theory of Rayleigh scattering from density fluctuations is applied to data taken in glycerol and n-butanol over wide temperature ranges. It is shown that Brillouin scattering is useful in evaluating the viscoelastic parameters of a liquid when all corrections are properly applied. The position, half-width, and int…
Maximum Crack Width in Reinforced Concrete Flexural Members
THE MAXIMUM CRACK WIDTH MEASUREMENTS FROM A NUMBER OF CRACK WIDTH INVESTIGATIONS WERE EXAMINED USING STATISTICAL METHODS. PREVIOUSLY PROPOSED EQUATIONS FOR MAXIMUM CRACK WIDTH WERE COMPARED AND NEW EQUATIONS WERE PROPOSED AS A RESULT OF THE ANALYSES. INTEREST IN CRACK WIDTHS IN FLEXURAL MEMBERS HAS BEEN STIMULATED BY…
Crystal size distributions in continuous crystallizers when growth rate is size dependent
Abstract Empirical size‐dependent growth rate models are studied for their effect on the population density distributions from a continuous, mixed suspension, mixed product removal (CMSMPR) crystallizer. The growth rate models and/or their corresponding population density distributions are examined for continuity, con…
The magnetic behaviour of cubic-field 4 T 1g terms in lower symmetry
The behaviour of the magnetic properties of the 4T1g term under simultaneous perturbation by spin–orbit coupling and an axial ligand-field is presented. The theory is applied to the variation with temperature of fifteen octahedral cobalt(II) complexes in the range 80–300°K. The values of k, the orbital reduction facto…
Enthalpy Changes and Heat-Capacity Changes in the Transformations from High-Surface-Area Amorphous Ice to Stable Hexagonal Ice
Amorphous ice prepared by slow condensation of water vapor onto a surface cooled with liquid nitrogen or liquid hydrogen undergoes several exothermal transformations on warming. Thermal analysis by means of warming curves indicates that the heat liberated on warming ice prepared at − 253°C is 8 cal/g from − 253° to −…
Reactions of gases in solution. Part III. Some reactions of nitrous oxide with transition-metal complexes
Nitrous oxide reacts rapidly in solution at room temperature and at atmospheric pressure with a number of transition-metal complexes. It reacts with the cobalt(I) corrin, vitamin B12s, in aqueous solution according to the stoicheiometry 2CoI+ N2O → 2CoII+ N2 and with [CoI(Ph2P·CH2·CH2·PPh2)2]Br in benzene or ethanol a…
Intergranular Corrosion of Nonsensitized Austenitic Stainless Steels
The effects of alloying additions on the intergranular corrosion of nonsensitized austenitic alloys in boiling nitric acid-dichromate solutions have been determined. Controlled additions of C, N, O, Mn, S, Si and P to a high purity 14% Cr-14% Ni-bal Fe alloy and subsequent corrosion tests in boiling 5 N HNO3-0.46 N Cr…
Dislocations and Persistent Slip Bands in Copper Single Crystals Fatigued at Low Stress Amplitude
Abstract Persistent slip bands in fatigued copper single crystals are studied by means of transmission electron microscopy of surface thin foils, both parallel and nonparallel to the surface. Comparing the observations from the different nonparallel sections a three‐dimensional model of the internal structure may be c…
Critical Potentials for Pitting Corrosion of Ni, Cr-Ni, Cr-Fe, and Related Stainless Steels
Critical pitting potentials for the binary Cr‐Fe and Cr‐Ni alloys in 0.1 N NaCl become more noble (correspondingly more resistant to pitting) with increasing Cr content, particularly in the region 25–40% Cr and 10–20% Cr, respectively. The potentials for 57.8% Cr‐Fe and pure Cr fall within the transpassive region. Ni…
Phase Transformation and Deformation Processes in Oriented Polyethylene
Plastic deformation processes in oriented polyethylene are investigated by the X-ray method, and changes in texture produced by transverse compression are interpreted in terms of twinning, slip and phase transformation. The crystal structure of the new form produced by the phase transformation is determined, and the u…
Polaronic Impurity Hopping Conduction
Abstract Impurity hopping conduction in polar lattices and amorphous substances is investigated by application of the canonical transformation of the small polaron theory. In the case of acoustic coupling only, the results of Miller and Abrahams and Gosar for one‐phonon processes are recovered and compared with the co…
Carbon and Graphite Handbook
Carbon and graphite handbook , Carbon and graphite handbook , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی