Materials Literature
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Abstract The effect of tetrabromobisphenol A diallyl ether (TBBA–DAE) on the flame retardancy of high impact‐strength polystyrene (HIPS) was studied and compared with that of tetrabromobisphenol A (TBBA). Experimental results showed that the flame retardancy of TBBA–DAE was superior to that of TBA by thermomixing in t…
The Read-Shockley treatment of small-angle grain boundaries in crystals is generalized to the case of quasicrystals. The dependence of the grain-boundary energy on the angle of mismatch between abutting quasicrystalline grains is calculated. It is found that, even for a symmetric tilt boundary in a quasicrystal, dislo…
Abstract The comparative study of thermal degradation for poly[3‐dimethyl(methacryloyloxyethyl)ammonium propanesulfonate] [poly(DMAPS)] was studied by various methods under different conditions. The reaction order, the activation energy, and the preexponential factor were evaluated from thermal gravimetric curves. The…
A simple model is introduced to describe the observed coexistence of gelation and phase demixing in atactic polystyrene solutions. It is shown that the multiple equilibria conditions for molecular clustering caused by physical cross linking can lead to a characteristic feature of the phase diagram. The condition is ex…
Ferroelectricity in ${\mathrm{Zn}}_{\mathrm{x}}$${\mathrm{Cd}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$Te was found from the temperature variation of the dielectric constant, and from the hysteresis loop. The Zn contents varied from 4% to 45%. No ferroelectricity was found in pure CdTe but all samples containing Zn had a…
We present a new type of localization phenomenon in a one-dimensional tight-binding model with a quasiperiodic potential ${\mathit{V}}_{\mathit{n}}$=tanh[Acos(2\ensuremath{\pi}\ensuremath{\omega}n)]/tanhA, where \ensuremath{\omega} is an irrational number. When A is small, the localization starts from the center of th…
Containerless undercooling in an electromagnetic levitation device was used to observe solidification velocities as a function of undercooling temperature for pure Ni and Cu-Ni alloys. In a limited temperature range, the results can be interpreted using current theories, provided the conditions for local equilibrium a…
A new type of halide glasses, based on coordination compounds of the chlorides, bromides and heavy metals have been proposed. The formation of the halide glasses and their property will be discussed on the basis of suggested sheme of cluster compound formation. The paper also deals with the fabrication of silver and t…
Scanning Deep Level Transient Spectroscopy (SDLTS) is a current SEM technique for the detection of the local distribution of deep level centres in semiconductors. The contribution deals with the physical foundations of the SDLTS technique and it discusses the demands on the instrumentation. The measurement practice is…
To date it has been difficult to identify active material originating from the oxidation products of cladding alloys in the cooling circuits of power reactors. In an attempt to solve this problem, a sample of cladding oxide was characterized fully using secondary ion mass spectrometry (SIMS), exploiting the high sensi…
The phase diagram of the system Na2S04-Na2C03 has been determined from room temperature upto liquidus. At low temperature the system shows partial miscibility and the formation of a compound, burkeite. At high temperature, the whole system shows complete miscibility and crystalizes in hexagonal system, with P63/m mc s…
The paper gives the reasons for the development of a gold alloy of 990 fineness with good colour, durability, and mechanical properties, and explains why titanium was chosen as the alloying metal. Methods are descriptionbed for the alloy's production, solutionizing, and age-hardening. Mechanical properties are given a…
Abstract Divalent metal terephthalates such as the zinc, calcium, barium, and cadmium salts appear, from their properties, to be polymeric. As a result, exceptionally high decomposition temperatures and unusually low solubilities are found. Although not in themselves vinyl heat stabilizers, in concert with typical mix…
Abstract Diantipyrylmethane and tiron spectrophotometric determinations of Ti in the super alloys, Inconel 718 and Inconel 600, have been studied thoroughly. Both reagents formed stable yellow complexes with Ti(IV) in acidic medium. The possible interference from Ni, Fe and Cr was examined. Interference from Fe(III) w…
We formulate a continuous-time random-walk model for the motion of conducting ions in \ensuremath{\beta}-alumina which accounts for correlation effects as well as free and jump diffusion mechanisms in a unified way. The calculated frequency-dependent conductivity and incoherent intermediate scattering function agree w…
The crystal structures of RbMnCl3 and RbMnBr3 were determined to be hexagonal P63/mmc. The differences between these two structures are that in RbMnCiJ there are six close-packed layers while there are two close-packed layers in RbMnBr3. Moreover, in the latter structure the Mn-Br octahedra share opposite faces to for…
Mn 5 (H 2 O) 8 (AsO 3 OH) 2 (AsO 4 ) 2 .2H 2 O cristallise dans P1 avec affinement jusqu'a 0,028. La structure consiste en un nombre egal d'ions AsO 4 et AsO 3 OH ayant des sommets communs avec des octaedres centres sur les atomes Mn
The structure and properties of air textured yarns are influenced by the dynamic friction of the parent filament yam. We have demonstrated this by texturing under various conditions two similar multifilament yarns with different spin finishes. We have analyzed the effects of water and mechanical stretch on the structu…
Abstract Within the framework of the Peierls model an integral equation for the dislocation density distribution of 〈111〉 screw dislocations with threefold symmetry in b.c.c. crystals is derived. The dislocation core, described by a density of infinitesimal Burgers vectors, is extended along three {110} half‐planes in…
From the rhizomes of HYPOXIS OBTUSA two monoglucosides having the same aglycone as hypoxoside, 1-(3',4'- dihydroxyphenyl)-5-(3'',4''-dihydroxyphenyl)-1-pen-ten-4-yne, have been obtained. By methylation followed by hydrogenation they have been transformed into the same compound, 1-(3'-methoxy-4'- O-beta- D-glucopyranos…