Hydrogen Permeation Properties of Perovskite-type BaCe_(0.9)Mn_(0.1)O_(3-δ)Dense Ceramic Membrane

In recent years, mixed-conducting oxides, in which both protonic and electronic charge carriers exist, have received increasing attentions1. Ceramic membranes made of such materials are semipermeable to hydrogen at elevated temperatures. In the early 1980s, Iwahara et al. first reported protonic conduction in SrCeO3-based materials2. Later, BaCeO3 system was extensively studied because of its higher conductivities. However, the electronic conductivity of rare earth doped-BaCeO3 ceramic…     

A Novel Zirconium-Based Perovskite-Type Membrane Material for Oxygen Permeation

Zirconia with fluorite structure stabilized by doping rare earth or alkaline earth metal oxides such as Y2O3 and CaO (YSZ and CSZ) is a class of traditional mixed conducting membrane materials, which have been widely investigated for their high oxygen ionic conductivity and excellent chemical and thermal stability1-3. But the electronic conductivity of these materials is very small, unless operated with an internal or external circuitry, the oxygen flux through membranes in usual ranges of …     

A New Rapid Determination Method of Soil Organic Carbon Adsorption Coefficients of Pesticides with Soil Column Liquid Chromatography

Recent legislation in many countries requires extensive testing of all manufactured chemicals for environmental evaluation and registration. Among the requirements are water solubility, solvent (usually octanol) - water partition coefficient, soil adsorption and bioconcentration factors in aquatic organisms. Soil adsorption influences the extent of vaporization of a compound from the soil surface and its lateral (run-off) or vertical transport including groundwater contamination. Additionally,…     

Bcklund transformation, non-local symmetry and exact solutions for (2+1)-dimensional variable coefficient generalized KP equations

IntroductionDuring the study of water wave, many completely iategrable models were derived, such as(1+1)-dimensional KdV equation, MKdV equation, (2+1)-dimensional KdV equation, Boussinesq equation and WBK equations etc. Many properties of these models had been researched,such as BAcklund transformation (BT), converse rules, N-soliton solutions and Painleve property etc.II--8]. In this paper, we would like to consider (2+1)-dimensional variable coefficientgeneralized KP equation which …     

CrWMn钢细化强韧化的研究

本文利用ＣｒＷＭｎ钢刀片镶钢余热进行高温淬火，有效地抑制网状碳化物的析出。以高温回火代替球化退火，实现碳化物超细化。降低淬火加热温度．获得细小奥氏体晶粒。使ＣｒＷＭｎ镶钢刀片的抗弯强度与冲击韧性由δ-bb=1088MPa,α-k=19.6J/cm～2提高到δ-bb＞2466MPa,α-k＞88J/cm～2,HRC＞60，获得明显的强化韧化效果．     

Anthracylmethyl Benzoazacrown Ether as Selective Fluorescence Sensors for Zn^2＋

A new benzoazacrown ether fluorescence sensor was synthesized with 9-anthrylmethyl chloride and benzoaza-15-crown-5 in CH3CN, which particularly shows a strong affinity for Zn^2 .Its fluorescence quantum yield increase more than one order of magnitude and a red shift could be noticed when passing from the apolar to the polar solvent.     

千瓦级COIL-UR90实验研究

 首次报导了千瓦级化学氧碘激光器（COIL）采用束转动90°环形非稳腔(UR90)的实验结果,测量了输出光斑的近场相位分布及远场强度分布, 当激光输出平均功率为2kW时,光束质量因子b =3~4。     

The Effects of CO2 Addition on the Partial Oxidation of Heptane for Hydrogen Generation

The effects of CO2 on the partial oxidation of heptane for hydrogen generation have been studied. Based on the experimental results and thermodynamic equilibrium calculations, the validity of CO2 addition to weaken the hot spots, and the feasibility of the autothermal operation are discussed.     

2-芳基硫杂脯氨酸的合成及其研究(Ⅱ)——新硫杂脯氨酸衍生物的合成及鉴定

本文用L-光胱氨酸及相应的芳醛合成3个新的2-芳基硫杂脯氨酸,并测定了其红外光谱和核磁共振谱,同时讨论了它们的结构和构型。     

EXISTENCE OF LIMIT CYCLES FOR A CUBIC KOLMOGOROV SYSTEM WITH A PARABOLIC SOLUTION WHICH DOES NOT CONTACT AND INTERSECT THE COORDINATE AXES

This paper is concerned with a cubic Kolmogorov system with a parabolicsolution which does not contact and intersect the coordinates. The conclusionis that such a system may possess limit cycles.