Materials Literature
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Using synchrotron radiation and an imaging plate the authors have performed a high-angular-resolution powder X-ray diffraction study of the 'distorted FCC' high-pressure phase of praseodymium. The crystal structure of this phase is identified as the trigonal space group R3m (D 3d 5 ) with eight atoms in the rhombohedr…
We have investigated the transverse and longitudinal electro-optic properties of epitaxial single crystalline lead lanthanum zirconate titanate ferroelectric thin films grown by pulsed laser deposition on [100] silicon and MgAl2O4 substrates. With the electric field applied in a longitudinal geometry, we measure biref…
The possibility of varying the compositional long-range order parameter s and the influence of s on the ferroelectric properties of pure and Li-doped Pb(Yb 0.5 Nb 0.5 )O 3 ceramics have been studied. X-ray diffraction and dielectric measurements were used. A compositional order-disorder phase transition was discovered…
A novel mechanism is proposed for efficient manipulation of transport forces acting on the droplets during spray pyrolytic deposition of thin films. A ‘‘burst mode’’ technique of spraying is used to adjust the deposition conditions so as to transport the droplets under the new mechanism. Transparent, conducting thin f…
We propose an explanation for the experimentally observed transition in the shape of silicon clusters of size 20\ensuremath{\le}N\ensuremath{\le}40: Elongated shapes of low energy can be obtained by stacking stable subunits, while concurrent optimization of surface-to-volume ratio and surface structure leads to compac…
Article X-ray and electron diffraction investigations on the stable decagonal phase in Co — Ni — Al alloys was published on August 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 205, issue 1-2).
This study examined how fibre and fabric properties affect the drying time of a wide range of textile materials. It was found that the drying time of a fabric is independent of its fibre type and thus regain, but dependent on the amount of water initially in the fabric which depends to a great extent on the thickness…
Based on the dynamic bond percolation model, we try to regenerate the non-Arrhenius temperature dependence for the ionic conductivity of the polyethylene oxide type polymer electrolytes by considering continuous, correlated motions of the host polymer matrix. To simulate the chain movements, periodic rotations of bond…
The N-methylated and/or N-ethylated I− and BF4- salts of 2-(3-pyridyl)- (2(m)) and 2-(4-pyridyl)-4,4,5,5-tetramethyl-nitronylnitroxides (2(p)), and 2-(4-pyridyl)-4,4,5,5-tetramethyl-imidazolin-1-oxyl (3(p)), and also the radical cation/radical anion salts obtained by the exchange reaction of I− and BF4- in the above r…
Graded DLC based coatings and multilayers for wear resistance applications have been produced using a novel hybrid unbalanced magnetron sputtering/ low pressure CVD System. The main features of this highly flexible and scalable process are discussed. These films have been characterised using a variety of techniques in…
The theory of polarizable anisotropic fluids is developed on the basis of a model fluid consisting of anisotropic Drude oscillators with embedded permanent dipoles. A matrix theory is developed. The dielectric tensor is derived and a matrix Monte Carlo method is used to calculate the optical absorption and birefringen…
The multiple reflection method of Schmidt [Ann. Phys. (Leipzig) 23, 671 (1907)] has been developed to study the general case of backscattering of electrons from multilayers. Exact expressions have been given for the absorption, backscattering, and transmission of electrons impinging on multilayers which reduce to prev…
Abstract The effect of aluminium hydroxide particle size and shape has been investigated on the performance of (polymethyl methacrylate) composites in a number of flammability tests. As a subsidiary exercise correlation between the tests has been investigated. The work has shown the expected effect of particle size on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel two-step synthesis of poly(benzothiazoles) via new precursor polyamides from 2,5-bis[(cyanoethyl)thio]-1,4-phenylenediamine and aromatic dicarboxylic acid chloridesTatsuya Hattori, Kazuhiro Kagawa, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1993, 26, 16…
Coatings of carbon-boron-nitrogen compounds with various compositions are obtained in a low pressure chemical vapour deposition process using acetylene, boron trichloride, ammonia and hydrogen as input gases. Compositions are located in the ternary system C-BN-"BC3". The structure of the films is a graphitic turbostra…
An expanding spherical gas bubble moves in an incompressible, viscous fluid under gravity. The nonlinear equations of motion are solved numerically. The growth of the radius of the bubble, the velocity of its center, and the drag experienced by the bubble are obtained with the progress of time. The gravity is found to…
For many years the thickener [1, 2] requirements of textile printers have been met by naturally occurring gums such as guar, alginate, locust bean, starch, and cellulose derivatives [3]. These thickeners require very long hydration times [4], have poor thermal stability, and a low degree of purity. They have therefore…
Abstract Redetermination of the crystal structure of poly( p ‐benzamide) was made by using newly collected intensity data. The molecular conformation is TCTC, where the internal rotation angles about the NC bond of the amide group and about the virtual bond of N ‐phenyl‐ C are T (trans) and C (cis) conformations, res…
A study is presented of the properties of luminescent ceramics which are roughly based on rare-earth doped oxides, oxysulfides, garnets, and silicates. Exemplary luminescent ceramic specimens are prepared on the basis of (Y,Gd)/sub 2/O/sub 3/:Eu, Gd/sub 2/O/sub 2/S:Pr,Ce, Gd/sub 3/Ga/sub 5/O/sub 12/:Cr,Ce, and Y/sub 2…
The dynamics of an underwater explosion bubble, including its collapse and interaction with a free or hard surface, are analyzed using incompressible flow theory and a boundary integral formulation. The formulation of the solution method and the crux of the numerical treatment are presented in detail. A computer progr…