Advanced Materials Research Vol. 852

Abstract: The reaction mechanism of selective non-catalytic reduction on NH₃-NO has been investigated experimentally in high temperature. The result has shown several basic conclusions: a) The reaction of NH₃-NO is self-sustaining; b) oxygen must be involved in the reaction process of NH₃-NO; c) Denitration reaction of NH₃-NO in the temperature range centered at T1250K; d) the temperature window for NO removal moves to lower temperature, with adding hydrogen (H₂) or hydrogen peroxide (H₂O₂) as well keeping the width of the window unaltered; e) the reaction is not explosive, and it takes place relatively smoothly in the course of approximately 0.1 sec.

Abstract: Ten compounds were isolated from the ethol extract of the whole plant of Cremanthodium potaninii. Stigmasterol (1), β-sitosterol (2), triacontane (3), 5,6-dihydroxy-3,4,7-trimethoxyflavone (4), 5,6,7-trihydroxy-3,4-dimethoxyflavone (5), 6-hydroxy-7-methoxycoumarin (6), taraxasterol (7), caffeic acid (8),hexacosoic acid (9),triacontanoic acid (10). All these compounds were isolated from Cremanthodium potaninii for the first time.

Abstract: Low temperature sintering of TiO₂-base varistor was systematically investigated through doing with V₂O₅ and B-Si glass. Pellets prepared could be densely sintered from 1273 to 1473K. The highest relative density, 94.6%, was found in the sample sintered at 1433K. According to I-V plots of ceramic pellets, the nonlinear coefficient α and breakdown voltage V_1mA were obtained and found to be α=2~5 and V_1mA=15~30V. The room temperature dielectric constant was very large, high as to about 20000. Powder XRD analysis has shown the desirable macro-structural characteristics of these compacts.

Abstract: Glucose oxidase (GOD) (EC 1.1.3.4) is an oxido-reductase that catalyses the oxidation action of glucose to hydrogen peroxide and D-glucono-δ-lactone [. GOD is widely used in the determination of free glucose in body fluids, in vegetal raw material and in the food industry [. It also has many applications in biotechnologies, typically enzyme assays for biochemistry including biosensors in nanotechnologies. Free GOD will be denatured and inactivated rapidly due to its structural instability under extreme pH or temperature [. Four immobilizing methods, including physical adsorption, covalent binding, crosslinking and embedding methods, were used to improve their economic feasibility. Covalent binding combined active functional group monomers of carriers onto enzymes [4-. Researches showed that oxirane groups can react with-NH₂ and-HS of enzymes under mild conditions so that the enzyme molecules were immobilized on the copolymer support containing oxirane [.

Abstract: ZrO₂-MgO and Mo powder coating on a substrate material prepared by an high temperature plasma spraying forming (PSF) for lease-shaped engine nozzles, and its total thickness is about 300 μ m. The surface coating changes of microstructure were investigated by a small solid rocket motor static ablation and the results were discussed for preliminary ions after ablation. The results show that the plasma spraying throat coat is a layer structure and the pore consist in micro-gap between layer and layer.That throat coating erosion is so severe were found after the ablation test , which is because of the metal oxide particles caused by mechanical denudation and high temperature thermal chemical ablation.Whereas the coating interface have no significant cracks after erosion, so that the composite coating of ZrO₂-MgO and Mo wear good erosion performance.

Abstract: As urbanization level of our country improves constantly, urban population will increase dramatically. Then industrial and civil buildings and other facilities will be multiplied, which leads to use plenty of high-performance concrete materials. i.e. China's building materials, especially the use of concrete will be increased year by year^[. And the chemical admixtures is an essential fifth component of concrete^[2-. It has been nearly 50 years since the chemical admixtures were researched,expolited and used in large scale^[.But the water reducer are used most widely, its characteristics is to reduce the water consumption of concrete, and minimize the porosity of concrete. Thereby which enhances its intensity and durability.

Abstract: Polyacrylamide is of concern in oil recovery wastewater treatment because of its persistence and environment effects. A concept is proposed to synthesize γ-Fe₂O₃ particles with magnetic functionalization for polyacrylamide removal from aqueous media. Magnetic particles were synthesized by the sol-gel method, using NH₄HCO₃ and FeSO₄·7H₂O. These magnetic particles show high adsorption capacity for polyacrylamide. Because of the useful magnetic property, large specific surface area and fast magnetic separation, the synthesized materials will provide a convenient and highly efficient means to remove polyacrylamide from oil recovery wastewater.

Abstract: By using scrap miscellaneouszinc materialas raw materials, a new technology with the help of two distillationsby fire method to produce zinc oxide was invented.The scrap miscellaneous zinc materialshave complex sources, containing dust, stone, iron and steel parts and other impurities, and zinc content is more than 15% over a wide range. The presence of zinc is in the form of pure metallic state, alloy state and oxidation state.Distillation process has two steps, the primary for removing the principal impurities and the second for zinc oxide purification. With less investment, low cost, simple equipment, easy operation, environmental protection and other advantages, this method is fit for production of high-purity zinc oxide and can also be used for the production of nanoscale high purity zinc oxide.

Abstract: With the rapid increase of social requirements on energy, as well as the increasing deterioration of the global environment, energy production becomes one of the most important future challenges for human society. In this context, biomass has become a renewable resource with high potential for energy production [1]. In recent years, the demand for and use of renewable energy has increased globally [. Bio-energy is regarded as one of the key options to mitigate greenhouse gas emissions and substitute fossil fuels, especially obvious in Europe. Over the past 10-15 years, heat and electricity production from biomass increased with some 2% and 9% per year, respectively, biofuel production increased about eight-fold in the same period between 1990 and 2000. Biomass contributed some two-thirds of the total renewable energy production in the European Union (EU) (2000 PJ) or 4% of the total energy supply in 1999 [.