Silos theory and practice
Diagrs., graphs, illus., tables. Bibliography p. 251. Translated from French; Distributed by: Trans Tech S.A. CH-4711 Aedermannsdorf, Switzerland
Materials Literature
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Numerical Calculation of Psychrometric Properties in SI Units
ABSTRACT THREE computer subroutines for numerical calculation of psychrometric properties are discussed. Input parameters required are wet- and dry-bulb temperatures, dew point and dry-bulb temperatures, or relative humidity and dry-bulb temperature. All results are in SI units. Restrictions on the use of certain rela…
On a metastable miscibility gap in γ-Mn-Cu alloys and the origin of their high damping capacity
A metastable miscibility gap has been found which explains the decomposition behaviour of γ-Mn-Cu alloys. Hardness measurements as well as results of other authors were used to outline the boundaries of the two-phase region. Electron microscopy provided direct evidence for the phase separation prior to α-Mn precipitat…
The Electrodeposition of Aluminum from Aromatic Hydrocarbon: I . Composition of Baths and the Effect of Additives
Electroplating of aluminium on copper and steel substrates was conducted at room temperature. The bath consisted basically of and an alkali metal bromide such as dissolved in a suitable mixture of aromatic hydrocarbons. The bath was operated under conditions resembling industrial operation. Oxygen and humidity were re…
The Liquid Crystal Properties of Some Cyano-Substituted Aryl Esters
Forty-five aryl esters (R-Ar-CO.O-Ar′-CN) containing terminal cyano and R = alkyl or alkoxy substituents were prepared. The aryl moieties of the esters were either 1,4-phenylene, 2,6-naphthylene or 4,4′-biphenylene. All combinations of these aryl groups were examined and the liquid crystal properties are compared with…
Twinning by merohedry and X-ray crystal structure determination
Twins by merohedry can be usefully divided in two classes. Class I: the twin operation is contained in the Laue symmetry of the crystal and twin-related reflexions have equal intensities; in this case the set of intensities collected from a twin is indistinguishable from that collected on a single crystal. Class II: a…
Formation of Cavities From Nondeformable Second-Phase Particles in Low Temperature Ductile Fracture
Limiting solutions are discussed for elastic-plastic deformation around rigid particles of both equiaxed and greatly elongated shapes. It is shown that if the matrix can be characterized as a rigid nonhardening continuum the stress concentration at the particle interface and interior is less than two for either equiax…
The Apparent Contact Angle of Liquids on Finely-Grooved Solid Surfaces-A SEM Study
A finely parallel-grooved nitrocellulose surface has been employed as a model to study by scanning electron microscopy the influence of roughness on the spreading equilibrium of liquid drops. The Cassie and Baxter equation for spherical drops on a composite interface was experimentally confirmed with mercury and a sim…
Trends in the nematic–isotropic liquid transition temperatures for the homologous series of 4-n-alkoxy- and 4-n-alkyl-4′-cyanobiphenyls
The lower homologues of the series of 4-n-alkoxy- and 4-n-alkyl-4′-cyanobiphenyls have been prepared and their liquid crystal transition temperatures determined. The trends in the nematic–isotropic liquid (N–I) transition temperatures along the series are compared with observed trends for other homologous series. Thes…
Applications of vanadium-51 and phosphorus-31 nuclear magnetic resonance spectroscopy to the study of iso- and hetero-polyvanadates
Vanadium-51 n.m.r. spectra of a number of iso- and hetero-polyvanadate anions are reported. Spectra of solutions containing [V10O28]6–(pH 6.5–3.5) are consistent with the known solid-state structure of this anion. The [VO2]+ cation in aqueous solution almost certainly has an octahedral cis-dioxo-structure as its n.m.r…
Exchange interaction in polynuclear complexes. Part 2.—Antiferromagnetic coupling in binuclear oxo-bridged iron( III ) complexes
A previously described model for exchange interaction is applied to the study of antiferromagnetic coupling in binuclear oxo-bridged iron (III) complexes. The energies of the magnetic orbitals (singly occupied d orbitals of each transition ion, partially delocalized towards the ligands surrounding this ion), and of th…
Quantitative Auger electron spectroscopy using elemental sensitivity factors
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Paul W. Palmberg; Quantitative Auger electron spectroscopy using elemental sensitivity factors. J…
A symmetry approach to domain structures
Whereas the symmetry of the order parameter is specified by operations preserved at the transition, domains are determined by lost symmetry operations. The number and the relations between domains and domain pairs can be found by grouping the lost operations into left and double cosets. Different types of domains, rot…
Pressure dependence of helium and neon solubility in vitreous silica
The pressure dependence of helium (at 25 °C) and neon (at 150 °C) solubility in vitreous silica has been measured at pressures up to 1400 atm. Results appear to be readily explained by a simple statistical thermodynamical model based on the Langmuir adsorption model. Values for the accessible free volume of the glass…
Hydrogen Problems in Energy Related Technology
A survey of hydrogen degradation problems in energy related systems is presented. Nine separate phenomenological classifications of such degradation are presented. Key areas of unsolved problems and needed research are specified. Hydrogen embrittlement mechanisms and hydrogen attack in particular, are pinpointed as cr…
Redox behaviour of transition metal ions in zeolites. Part 3.—Auto-reduction of cupric ions in Y zeolites
In CuY zeolites degassed at temperatures above 650 K cupric ions are reduced to some extent to cuprous ions.Evidence for this process of auto-reduction was taken from the decrease in weight of the sample, and the detection of a desorbing gas in a volumetric system. The latter was identified as oxygen. U.v. reflectance…
Interactions between Solvents and Polymers in the Solid State
One of the goals of modern polymer research is to achieve an understanding in rigorous and quantitative terms of the molecular chain configuration and of the spatial arrangement of the polymer molecules in the solid state. This problem is of particular interest for oriented semicrystalline polymers such as textile fib…
The effect of excess thermodynamic properties versus structure formation on the physical properties of glassy polymers
The dynamic mechanical properties of glassy polymers, such as atactic polystyrene and poly(ethylene terephthalate), have been followed as a function of the excess enthalpy during isothermal annealing at selected temperatures below their respective glass transition temperatures. For glassy polymers prepared from crysta…
Dielectric and optical studies of a nematogen (4,4-n-heptyl-cyanobiphenyl)
The permittivity, refractive index, molecular dipole moment, dielectric relaxation parameters and molecular Kerr constant are reported for the nematogen 4,4-n-heptyl-cyanobiphenyl (HCB) in the nematic phase, in the pure isotropic phase and in benzene solutions. The anisotropy of molecular polarizability is less than i…
Polymorphism in Vanadyl Phthalocyanine
Phase transitions in vanadyl phthalocyanine have been studied using differential scanning calorimetry, x-ray scattering and optical absorption spectroscopy. Three phases, I, II and III, were prepared by nonequilibrium vapour quenching, equilibrium crystal growth and melt quenching, respectively. Phase I is metastable…