Materials Literature
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A microdosimetric track interaction model for heavy charged particles has been developed which is capable of quantitatively predicting the experimentally observed supralinearity of the alpha particle TL dose response of peak 8 in LiF:Mg, Ti (TLD-100, Harshaw/Filtrol) as well as the linear behaviour of the lower temper…
The optical energy gap of single-crystal GeS was calculated from the absorption coefficient near the fundamental absorption edge. Measurements were carried out from room temperature to near liquid-nitrogen temperature using plane-polarised light with the plane of polarisation being parallel to either the a or the b cr…
Crystal size frequency distributions, crystallization histories, and thermal histories were calculated for the liquidus phase of a two‐component melt to model the crystallization of the liquidus phase of a multicomponent magma injected in a dike or sill. The crystal sizes, the variances of the crystal size frequency d…
Quasiresonant vibration-rotation transfer in the collision of an atom with a diatomic molecule is studies with use of classical trajectories. At high molecular rotation rates and low collision velocities the atom-diatom interaction consists of a sequence of small collisions ("collisionettes"). This leads to a nearly p…
We propose a generalization of the Landau theory of phase transitions which applies to reconstructive transitions. For the first time an order parameter is defined for this category of transition. This order parameter is shown to be a transcendental function of the large atomic displacements arising at the transition.…
Raman spectra of diamondlike amorphous carbon (a-C) films prepared by the sputtering method have been measured as a function of the excitation wavelength. The Raman spectral profiles vary sensitively, reflecting the change of absorption spectra associated with π-π* electronic transitions with the hydrogen content of t…
used hydroxylamine nitrate decomposes within a few minutes in the temperature range 130-140°C. Added ammonium ion is converted to N2, while hydrazinium ion is converted to HN3. Nitrous acid is an intermediate and its formation is rate-determining. A hygride transfer process is postulated. The reaction pathways hav…
Numerical and analytical calculations of the electronic properties of a one-dimensional quasiperiodic lattice are presented. The lattice consists of two types of bonds A and B whose distribution follows the recursion formula S l+1 =S m l-1 S n l where m, n=1, 2, 3, . . . and S l is a building block sequence for l>or=2…
Factors affecting photografting (λ > 300 nm) of methacrylic acid on low-density polyethylene film were investigated in liquid-phase system with water. Benzophenone was used as a sensitizer by coating it on the film surface. Factors examined were monomer concentration (1.3 wt% to 10.0 wt%), polymerization temperature (…
The use of either an SBS block copolymer or an emulsion-made methyl-methacrylate-grafted rubber alone failed to give any significant increase in the toughness of brittle poly(styrene-co-acrylonitrile) (SAN), even at concentrations up to 50%. However, a combination of the two rubber modifiers produced a strong synergis…
Alanine racemases are bacterial pyridoxal 5'-phosphate (PLP) dependent enzymes providing D-alanine as an essential building block for biosynthesis of the peptidoglycan layer of the cell wall. Two isozymic alanine racemases, encoded by the dadB gene and the alr gene, from the Gram-negative mesophilic Salmonella typhimu…
We discuss modulated phases that can occur in thin liquid-crystal films composed of tilted, chiral molecules. While the phase diagram depends on all orders of a Landau expansion we find that either a striped phase of parallel defect walls or a lattice of hexagonal unit cells containing disclinations and bounded by int…
Two strategies to solve the problem of instability of photoanodes against photocorrosion have been explored. The photocorrosion of photoanodes generally occurs when they enter the fabrication of efficient photoelectrochemical cells (i.e. showing high values of the open circuit voltage and photocurrent density). One of…
Abstract The aim of this paper is to assess the importance of fouling of heat exchanger surfaces in the recovery of heat from low-temperature geothermal brines. Samples of brines associated with four western Canadian gas and oil well operations were re-circulated through a test heat exchanger loop over periods of 11 t…
Article A Study of the Decomposition of Supersaturated Mg-Y-Nd, Mg“, and Mg-Nd Alloys / Eine Untersuchung des Zerfalls übersättigter Mg-Y-Nd-, Md-Y- und Mg-Nd-Legierungen was published on May 1, 1988 in the journal International Journal of Materials Research (volume 79, issue 5).
Abstract The formation of networks of various types has been simulated by using a physically realistic model that allows for intramolecular reactions to take place, thus forming loops of any size. The shortcomings of the kinetic approach, where systems are composed of functional groups that are selected at random with…
Abstract Schiff base (SB) monomers of vinylbenzaldehyde with functional amines were prepared. Copolymers of SB monomers with N ‐vinyl‐2‐pyrrolidone soluble in aqueous solutions were obtained in most cases. However, p ‐aminobenzenesulfonamide monomer resulted in gel formation. Thus, the reaction of vinylbenzaldehyde co…
Self-development of poly(methylmethacrylate) (PMMA) resist was done by irradiating various rare-gas ions at 50 keV in a mixed gas atmosphere of XeF2 and O2 to enhance the self-development rate, and the effects of various exposure parameters, including gas pressure, mixing ratio, dose, current density, pulse repetition…
A corrosion testing program was used to survey metal oxides potentially useful in a molten carbonate fuel cell environment. Tests included immersion of polycrystalline sintered pellets, powdered samples immersed in molten carbonate under 10 atm of simulated cathode gas, and immersion gravimetric tests using powder sam…
We have demonstrated that citrate synthase may be assayed by a simple, discontinuous, spectrophotometric procedure based on the measurement of oxaloacetate utilization with 2,4-dinitrophenylhydrazine. The assay is applicable both to the purified enzyme and to cell extracts, and has the advantage that it can be used in…