Materials Literature
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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…
A transmission-electron-microscope investigation of the orientation relations between faceted icosahedral quasicrystals and crystalline f.c.c. matrix in rapidly cooled alloys of Al-Mn reveals three different orientation relations: In the third relation the f.c.c.[111] axis cannot be exactly parallel to the twofold axi…
An analysis of fiber blending irregularities is presented in relation to the disturbances of blend yarn properties resulting from these phenomena. Fiber blending irregularities were assessed using the original method of yarn surface analysis and a new method of yarn cross-sectional division. These methods correctly re…
Crystals of neuraminidase heads from two different influenza B virus strains have been grown. Neuraminidase crystals of influenza B/Hong Kong/8/73 were grown from solutions of potassium phosphate. The crystals are tetragonal prisms, space group I422; the axes are a = 123 A and c = 165 A. Influenza B/Lee/40 neuraminida…
The Ag/sup +/-Na/sup +/ ion-exchange process in a soda-lime silicate glass was studied at 330 degrees as a function of composition of AgNO/sub 3/-NaNO/sub 3/ melt, mixing condition, and exchange time. The concentration profile of silver in glass was measured by atomic absorption spectroscopy and SEM technique. The sur…
5-Oxo-L-prolinase from Pseudomonas putida is composed of two reversibly dissociable proteins: Component A catalyzes 5-oxoproline-dependent cleavage of ATP, but does not catalyze the decyclization of 5-oxoproline; Component B is required for the coupling of ATP cleavage to ring-opening of 5-oxoproline to form glutamate…
A method of design for electrostatic lenses with given source parameters, first-order properties, and minimum aberrations is presented. It is based on constrained nonlinear optimization techniques. The variables in these procedures are spline coefficients of the axial potential distribution, or the electrode potential…