Materials Literature
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Article Clinoptilolite: the distribution of potassium atoms and its role in thermal stability was published on December 1, 1977 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 145, issue 1-6).
General formulas are derived for the estimation of the number of fiber-to-fiber contacts in fiber assemblies with arbitrary distributions of orientation and fiber length. The average number of contacts per unit volume of an assembly ñ v is given by [Formula: see text] where [Formula: see text] In this equation fi is t…
Abstract The polymerization of organic compounds in glow discharge (plasma polymerization) was investigated by using pulsed R.F. discharge (100 μsec on, 900 μsec off). The effects of pulsed discharge on polymer deposition rate, pressure change in plasma, ESR signals of free spins in both plasma polymer and substrate,…
The effects of porosity and grain size on the magnetic properties of NiZn ferrites were examined on groups of specimens with controlled porosity and grain size; both the permeability and the B‐H loop were measured. The demagnetizing factor, which is proportional to porosity, was estimated on the basis of the permeabil…
We discuss the calculational procedures of the kernels of GCM, RGM and OCM and some properties of them related to their calculation. The GCM kernels for various types of systems are treated and methods are discussed on the analytical evaluation and on the decomposition in terms of the number of nucleons exchanged betw…
The adsorption of polymer chains on small objects in solution, such as micelles, is discussed using scaling results to describe the confinement energy. Adsorption on small spheres and on clusters of such spheres is discussed and appropriate power laws for the dimensions and energies are derived. For non-interacting ob…
A linearized theory of the forced radial oscillations of a gas bubble in a liquid is presented. Particular attention is devoted to the thermal effects. It is shown that both the effective polytropic exponent and the thermal damping constant are strongly dependent on the driving frequency. This dependence is illustrate…
The development and the current state of knowledge of ferroelectric liquid crystals are reviewed. Symmetry considerations first indicated that a ferroelectric phase should exist. Synthesis of new molecules led to the first experiments on electro-optical properties, indicating a spontaneous polarization. Various studie…
Pb(Ti, Zr)O3 ceramics doped with Al, Mn or Fe exhibit constricted or asymmetrically displaced hysteresis loops. This distortion is due to an internal bias field Ei which can exceed the coercive field strength. Ei depends on the Ti/Zr ratio and on the kind of dope, and it increases with increasing doping concentration.…
The first analysis of a problem in cavitation and bubble dynamics was made by Rayleigh (1917), who solved the problem of the collapse of an empty cavity in a large mass of liquid. Rayleigh also considered in this same paper the problem of a gas-filled cavity under the assumption that the gas undergoes isothermal com…
DEFORMATION OF ENGINEERING MATERIALS. Tensile Response of Materials. Elements of Dislocation Theory. Slip and Twinning in Crystalline Solids. Strengthening Mechanisms in Metals. High-Temperature Deformation Response of Crystalline Solids. Deformation Response of Engineering Plastics. FRACTURE MECHANICS OF ENGINEERING…
Data on the catalytic properties of various substances (metals, their alloys, simple and complex oxides, and zeolites containing metal cations) in the oxidation of ammonia are described systematically and reviewed. The kinetics and mechanism of the reaction are discussed and the factors determining the activity and se…
Abstract An atomistic study of the motion of the 1/2 [111] screw dislocation was carried out for a shear stress applied on {112} planes and for uniaxial stresses along [012], [001] and [111]. Central force interactions described by the three different empirical potentials used in the previous work (Duesbery, Vitek &am…
The electrical conductivity of some nickel-zinc ferrites is studied as a function of temperature. The ferrites with iron in excess show n-type conduction and those with iron in deficiency show p-type conduction. Seebeck coefficient, X-ray analysis, and saturation magnetisation are also carried out to discuss the condu…
The acoustic emission during tensile tests is investigated for several types of aluminium alloys. It is found that the mean square amplitude of the continuous emission is proportional to strain rate and sample length. It is assumed that the continuous emission is generated by dislocation loops, which are created conti…
A computer simulation is carried out to study the motion of a magnetic domain wall through a random array of obstacles. The coercive field and the initial susceptibility are determined as a function of the defect density, the interaction force, and of the area and rigidity of the domain wall. For weakly interacting de…
NiMnGe is investigated by means of X-ray diffraction, neutron diffraction, and magnetometric methods. The orthorhombic distorsion of hexagonal lattice is observed below 470 K. The compound NiMnGe is antiferromagnetic with a Néel temperature TN = 346 K. The jump observed at temperature Tt = 185 K on the temperature dep…
Polarized infrared reflectivity measurements of PbW${\mathrm{O}}_{4}$ were made from 45 to 4000 ${\mathrm{cm}}^{\ensuremath{-}1}$ at 300\ifmmode^\circ\else\textdegree\fi{}K, and from 220 to 4000 ${\mathrm{cm}}^{\ensuremath{-}1}$ at 100\ifmmode^\circ\else\textdegree\fi{}K. Raman spectra were also obtained at 300\ifmmod…
Anomalous $S$-shaped deviations from Vegard's law in some semiconductor alloys are attributed to the effect of bond-bending forces. This idea is substantiated by numerical calculations on two-dimensional model alloys. A criterion is found which separates the occurrence of usually observed concave bowing and $S$-shaped…
The directional anisotropy in photoemission from valence bands of Cu and Au single crystals has been studied in the photon energy ranges $32\ensuremath{\le}h\ensuremath{\nu}\ensuremath{\le}200$ eV, and $32\ensuremath{\le}h\ensuremath{\nu}\ensuremath{\le}130$ eV, respectively. Angle-resolved photoemission energy distri…