Materials Literature
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Observations by transmission electron microscopy are reported on the processes involved in polymer crystal growth during annealing. The observations suggest that crystal growth occurs by two processes. One process involves the melting of those regions of the crystals in which the melting point is lower than the anneal…
The nucleation of nickel ammonium sulphate hexahydrate from aqueous solution has been studied by two different methods which involved measuring (a) the maximum allowable undercooling (the metastable zone width) and (b) the induction period before the onset of visible nucleation.Three different nucleation mechanisms we…
Raman scattering from mixed ordered and disordered crystals with perovskite structure has been investigated. In the paraelectric phase of the ordered crystal first-order lines were observed with symmetry properties forbidden for an ideal perovskite structure. Also, Raman line in the high frequency region is attributed…
In this paper, drape coefficients and mechanical properties of 138 samples of woven fabrics are measured, and the relation between them is analyzed by means of residual-regression method. A linear equation by which the drape coefficient can be calculated from the mechanical properties is presented.As a result, it is s…
Ethylene oxide gives the cyclic tetra-, penta-, and hexa-mer with BF3 in the presence of fluoroborate, fluorophosphates, or fluoroantimonates of alkali metals, alkaline earths or transitions metal.
A model is presented which produces a magnetostrictively driven rhombohedral distortion (λ111) in cubic diamond‐like structures. No tetragonal magnetostrictive distortion (λ100) is allowed, which is consistent with the experimental observation, λ111≫λ100. From x‐ray and single crystal measurements we find ‖λ111/λ100‖≳…
Abstract Secondary nucleation of magnesium sulfate and citric acid was studied in a seeded back mixed crystallizer. The MSMPR type of exponential population density distribution was obtained above 8 μm size in quasi steady state operation. Growth rates were satisfactorily correlated with supersaturation. Nucleation ra…
The liquid crystalline 6-alkoxynicotinic acids were prepared, and their transition temperatures measured. The isomeric 5-alkoxypicolinic acids are not mesomorphic. A series of 2, 6- and 2,5-disubstituted benzazoles were also synthesized. The effects of a molecule geometry, central linkages and a heteroatom on the meso…
Several α-Al2O3 specimens were prepared by thermal treatment of pure transition aluminas, already in the form of i.r. pellets. When the starting material is a high external area phase, the resulting sample is still suitable for i.r. work. In particular two preparations are considered, which only differ in the number o…
We have made neutron diffuse-scattering measurements of the magnetic-moment distribution around impurities in Fe as a function of temperature in an attempt to obtain information regarding the range of the exchange interactions. The measurements were made on Fe-based alloys containing 2-3 at.% of Si, Ge, Ti, V, Mn, Co,…
Abstract Ternary liquid‐liquid equilibria of the type aromatic + non‐aromatic + sulpholane were studied. The systems cyclohexane + benzene + sulpholane, 1‐hexene + benzene + sulpholane, hexane + benzene + sulpholane and heptane + toluene + sulpholane were experimentally determined at 25, 50, 75 and 100°C. The binary v…
The contribution of mixed-valence electron delocalisation to the ferromagnetic exchange between the iron(III) ions in Prussian Blue {FeIII4[eII(CN)6]3·14H2O} has been estimated theoretically. Agreement between the calculated and observed values of the Curie temperature is quite good.
Diagrs., graphs, illus., tables. Bibliography p. 251. Translated from French; Distributed by: Trans Tech S.A. CH-4711 Aedermannsdorf, Switzerland
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…
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…
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…
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…
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…
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…
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…