Materials Literature
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Kinetics parameters of BeO thermoluminescent material are presented. Thermoluminescence emission from irradiated BeO shows two well separated peaks. Using a linear heating rate of 8.07 K s -1 , the peak temperatures at maximum are 495 and 642 K respectively. Various methods have been used for trap parameter determinat…
A study has been made of the electrochromic behaviour of polyaniline films of potential use in passive display devices, and a preliminary examination of the properties of substituted polyanilines has also been carried out. Films of 'emeraldine-type' conducting polyanilines have been grown electrochemically from aqueou…
The one-dimensional, discrete Schrodinger equation is studied analytically for a class of quasiperiodic Hamiltonians known as the copper mean. The lattice is described by a recursion formula S L+1 =S L-1 S L-1 S L , L=2,3, . . ., given the two initial sequences S 0 and S 1 . Extended states are shown to exist for ener…
A low-temperature (≊400 °C) plasma-enhanced chemical vapor deposition process has been developed to grow diamond films for optical coatings application. Films with fine grains (≤3000 Å) have been obtained by controlling diamond nucleation. The surface roughness of the films is on the order of 50–200 Å. The optical tra…
Molecular-dynamics computations based on a simple tight-binding interatomic potential fitted to hcp zirconium confirm the Burgers mechanism for the temperature-dependent hcp-bcc phase transition. In our model the transverse ${\mathrm{T}}_{1}$ [110]-bcc N-point phonon, which is involved in the transition, is unstable i…
The properties of bismuth and tellurium microbolometers are presented. The TE devices are shown to have responsivitics approximately 100 times that of the more conventional Bi microbolometers. The Te device impedance is, however, much larger than Bi microbolometers of comparable size. To our knowledge, the Te device h…
There has been a growth of interest in fluid transport in very small structures. The basis for this interest derives from the application of micromachining technology to problems in fluidics. Several aspects of this problem are reviewed and discussed including some of our recent research on this topic. The problems di…
The problem of deriving explicit coordinates for quasicrystal approximants is solved in all cases where the quasicrystal has an inflation symmetry. In the higher-dimensional space R n , from which the quasiperiodic pattern is obtained by the cut method, the inflation symmetry is represented by a hyperbolic modular mat…
It is shown that very small atomic displacements of about 10 -9 AA can be detected by polarisation optical methods. The idea for such an optical determination of structural motions is based on an empirical model which considers the anisotropic polarisability and the orientation of the bonds as the origin of the optica…
High-purity MgO exhibits an unexpected giant anomaly of the apparent static dielectric constant and positive surface charge of the order of 5\ifmmode\times\else\texttimes\fi{}${10}^{21}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$ in the top 15 nm. We postulate that the MgO matrix contains traces of peroxy defects, ${\…
We report measurements of the intensity of the scattered light and the turbidity of aqueous solutions of the bovine lens protein, ${\ensuremath{\gamma}}_{\mathrm{II}}$-crystallin, near the critical point for binary liquiid phase separation, in a region of the phase diagram which is metastable with respect to protein-c…
Light produced by a laser plasma light source (LPLS) is used to perform optical reflectivity measurements on single crystals from 5 to 40 eV in a single experiment. The intense continuum generated by the rare-earth plasma allows a significantly higher resolution above 15 eV and extends the measurements to higher energ…
The specific magnetic-field-induced birefringence is measured in isotropic suspensions of the rodlike particle tobacco mosaic virus as a function of concentration and added salt. This quantity is proportional to the angular correlations between particles at zero field. In addition, the isotropic-nematic coexistence co…
The crystals of most proteins or other biological macromolecules are poorly ordered and diffract to lower resolutions than those observed for most crystals of simple organic and inorganic compounds. Crystallization in the microgravity environment of space may improve crystal quality by eliminating convection effects n…
Polymeric thermoinsulators in practical applications are often subjected to elevated pressures which tend to change their thermophysical properties. A feeling of a probable change in polymer thermal conductivity A, with pressure P, may be obtained in the framework of Debye equation for solid dielectrics where Cv is th…
Abstract At sufficiently high intensities ultrasonic irradiation of liquids causes cavitation which leads to extremely high local temperatures and pressures. Therefore, chemical reactions may be accelerated by ultrasound. This effect is called sonochemistry. Using representative examples from both homogeneous and hete…
Electron field emission calculations on atomic-size microtips are presented. Models inorporating the atomic size and the particular geometrical shape of the tip are proposed. Theoretical analysis explain the remarkable properties observed experimentally : strong electron beam focusing and anomalous I-V characteristics…
The symmetry modes transforming according to the irreducible representations of the little superspace group of the wave vector characterizing the incommensurate-to-incommensurate phase transition in ${\mathrm{NbTe}}_{4}$ are derived. Some of these modes are considered as possible order parameters, and possible Landau…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic study of the formation of the oxo diperoxo complex of tungsten(VI) in aqueous perchloric acid solutionM. Ashraf Islam and Richard C. ThompsonCite this: Inorg. Chem. 1989, 28, 24, 4419–4422Publication Date (Print):November 1, 1989Publication History Published online1…
Computer programs have been written which plot high accuracy trajectory paths for electrons through irregular finite-element meshes. The technique used to achieve this revolves around mapping irregular regions onto a normalized plane, where the usual operations of locating the electron’s position and interpolating for…