Materials Literature
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Abstract A new model for the case of a superposition of a phase transformation and a microstructure transition from columnar plane front to equiaxed dendritic growth for peritectic alloys is presented. This model is applied to Fe–Ni alloys where a phase transition from γ to δ takes place when the solute content decrea…
The structure, electrical resistivity, thermopower, and magnetic susceptibility of titanium diselenide intercalated with nickel (N x TiSe 2 ) are studied systematically in the nickel concentration range x =0–0.5. In accordance with a model proposed earlier, strong hybridization of the Ni3 d /Ti3 d states is observed,…
This article describes three new methods for performing simple flame tests using cotton swabs. The first method uses a Bunsen burner and solid metal salts; the second method uses a Bunsen burner and 1 M aqueous solutions of metal salts; and the third method uses candles, rubbing alcohol, and solid metal salts. These m…
Abstract Metal-free phthalocyanines were prepared in good yields by heating phthalonitriles with hexamethyldisilazane, (NH4)2SO4, and DMF. Good yields of metal-free phthalocyanines involving peripherally substituted phthalocyanines were attained with a catalytic amount of hexamethyldisilazane. Naphthalocyanine was als…
Possible mechanisms of a number of magnetoplastic effects in magnetically disordered crystals are analyzed in the context of the chemical kinetics of reactions occurring in a system of structural defects upon plastic deformation. Particular attention is given to spin-dependent reactions between real-structure elements…
Microporous two‐phase AlN–SiC composites were prepared using Al 4 C 3 and either Si (N 2 atmosphere) or Si 3 N 4 (Ar atmosphere) as precursors. The reaction mechanisms of the two synthesis routes and the effect of processing conditions on reaction rate and the material microstructures were demonstrated. The exothermic…
Postirradiation annealing tests were performed to obtain the 133Xe diffusion coefficients in uranium dioxide (UO2) and mixed thorium-uranium dioxide [(Th-U)O2] fuels. Specimens were a single-grained UO2, a polycrystalline UO2, and a polycrystalline (Th-U)O2. The (Th-U)O2 specimen was a mixture of 35% ThO2 and 65% UO2.…
Bacterial uridine monophosphate (UMP) kinases are essential enzymes encoded by pyrH genes, and conditional-lethal or other pyrH mutants were analysed with respect to structure-function relationships. A set of thermosensitive pyrH mutants from Escherichia coli was generated and studied, along with already described pyr…
Electrical steel with a Si content up to 6.5 wt% is a good soft magnetic material, because the power losses are reduced through the increased electrical resistivity of the bulk material by the presence of alloying elements like Si and Al. Nevertheless, with the increasing of the alloying elements, the concentration of…
A new mechanism of the intraband carrier relaxation in quantum dots embedded into a heterostructure at a relatively large distance from its doped elements is proposed. The relaxation process is related to the coupling between the electronic subsystem of a quantum dot and surface plasmon-phonon excitations of the doped…
The relationship between yarn structure and abrasion resistance is studied. Yarn abrasion resistant properties are measured on a Shirley abrasion tester. A new yarn structural parameter, the average surface length (average segment length of a fiber on the yarn surface), is proposed. Experimental work determines the re…
Ultrathin SiO2 layers are of importance for the semiconductor industry. One of the techniques that can be used to determine the chemical composition and thickness of this type of layers is x-ray photoelectron spectroscopy (XPS). As shown by Seah and Spencer [Surf. Interface Anal. 33, 640 (2002)], it is not trivial to…
Hemidesmus indicus root in the form of suspension in water (10 mg/ml) containing 15.5 mM NaCl, 3 mM KCl and 12 mM glucose, when injected into the ligated jejunal sac (1 ml/sac) of rat, increased the absorption of water, Na(+) and K(+) (but not glucose) from the sac. This bioactivity was present in the water extract (5…
Dramatic improvements in the selective separation and purification of NO x in exhaust gases by an electrochemical reactor have been achieved. The novel electrochemical cells for NO x decomposition were developed by nano‐scale control of penetrating pores from the catalytic electrode surface to the bottom of the cataly…
Porous polymeric materials offer a great versatility in most of the promising fields of applications. This article affords a critically selected overview of the recent synthetic strategies developed to design porous polymers and their potential applications in emerging areas of science and technology, such as analytic…
The thermal, mechanical, and chemical behavior of both thorium and uranium dioxide (ThO2-UO2) and thorium and plutonium dioxide (ThO2-PuO2)-based fuels during in-service and hypothetical accident conditions in light water reactors (LWRs) is described. These fuels offer the possibility for increased proliferation resis…
Ceramic nuclear fuel fabrication is an important step in the production of cheap nuclear power. Sol-gel processes are used to produce ceramic fuel in the form of microspheres of controlled size and properties. This paper describes a complete flow sheet of internal gelation process, one of the prominent sol-gel routes…
Vertical fissures (sandcracks) affect approximately 20% of adult beef cattle in western Canada. The risk factors associated with the formation of these lesions are not well understood. This paper describes a case-control study that identifies the role of increased claw size (claw volume > 390 cm3, odds ratio 7.8) in t…
Abstract Seeking a solution to the problem of disposing scrap tires, we attempted to depolymerize or degrade vulcanized rubber scrap such that the resulting pseudo‐liquid material could be used as an extender/plasticizer in virgin rubber compounds. As degraded natural rubber (DNR) and degraded styrene‐butadiene rubber…
Experiments of annealing effect of boron-doped homoepitaxial diamond film on Schottky junction properties have been conducted to investigate the origin of the “pinning” states in oxidized surface of diamond. Metals of Al, Ni, Au, and Pt are evaporated onto boron-doped diamond films with post thermal annealing less tha…