H_2及H~ 对C_xH_(1-x)薄膜表面状态的影响

系统研究了 H2 流量和 H 原位处理 Cx H1-x薄膜的时间对 Cx H1-x薄膜的稳定时间、表面悬挂键密度和表面电子局域化程度的影响 ,表明 Cx H1-x薄膜的长时间 H 原位处理是减小 Cx H1-x薄膜表面悬挂键密度的有效途径。     

Coupling Reaction of 4-Chloro-7-H-Pyrrolo[2,3-d]Pyrimidine with 2,3,5-Tri-O-Acetyl-β-D-Ribofuranosyl Chloride

Tubercidin (4-amino-7--D-riobofuranosyl-7-H-pyrrolo[2,3-d]pyrimidine) 1, an antibio-tic substance produced in the culture broth of Streptomyces tubericidus1, is an adenosine analog in which N-7 is replaced by a carbon atom. It has attracted much attention due to the biological activities for the growth inhibition of certain tumors, and many derivatives of tubercidin have been synthesized2-5.For the synthesis of tubercidin analogs, 4-chloro-7-H-pyrrolo[2,3-d]pyrimidine-2,3,5-tri-O-acetyl--D-r…     

"铁和铁的化合物"教学中新手-成手型教师课堂语言行为的比较研究

采用"弗氏语言互动分析方法"(FIAC)对"铁和铁的化合物"新手-成手型教师的课堂进行数据处理和分析,比较新手型与成手型教师的课堂语言行为的特点;为了弥补"弗氏语言互动分析方法"强烈定量化的局限性,本文还借助板块理论、课堂语音实录等材料与弗兰德斯互动分析的主要参数和语言动态曲线相结合,深入地分析了新手型教师与成手型教师...     

SYNTHESIS AND CHARACTERIZATION OF POLY(ARYL ETHER KETONE)FROM 4-(3-PHENYL-4-HYDROXYPHENYL)PHTHALAZINONE

A novel soluble poly(aryl ether ketone) was prepared by the reaction of 4-(3-phenyl-4-hydr-oxyphenyl)phthalazinone with 4,4'-difluorobenzophenone. The polymer was characterized by DSC, TGA andX-ray diffraction.     

D[X2m]的下界估计与X2m矩阵的快速构造

本文利用有向图理论研究了Xn矩阵的特性，给出了X2m矩阵类的快速构造方法，证明了拉丁方矩阵D[X2m]数目的下界估计是：2m(2m)! ∑^mi=2[(2m)!]^2/П^ij=1Kj!П^rj=1bj!。     

Effect of Polysaccharides from Fruit Body of Ganoderma tsugae on Bidirectional Regulation of Proinflammatory Cytokine Production in THP-1 Cells

The polysaccharides,FIII-2,FIII-2-a,FIII-2-b and FIII-2-c were purified from the fruit body of Ganoderma tsugae(G.tsugae) to study the effects of the four polysaccharides on the productions of human proinflammatory cytokines,interleukin-1α(IL-1α) and tumor necrosis factor α(TNFα).The results show that the polysaccharides up-regulated the production of IL-1α and TNFα in THP-1 cells under non-stimulatory condition or under stimulation of both lower concentration lipopolysaccharide(LPS) and phorbol myristate a...     

某类遗传环境下的两性分支过程：有关伴Y基因的灭绝概率问题

本文在文献[2]的基础上研究了另一类遗传环境下的两性分支过程（其中配对单元类型多于一种且有一种类型的配对单元数仅由雌性数嚼决定）并得到了有关它们灭绝概率的一些结果。     

C2H4的微波场助气相光催化氧化

用溶胶-凝胶法制备了多孔性TiO     

Quantum dynamics of dissociative adsorption of H_2 on Ni(100) using the dynamical Lie algebraic method

A dynamical Lie algebraic method has been applied to treating the quantum dynamics of dissociative adsorption of H_2 on a static flat metal surface. An LEPS potential energy surface has been used to describe the interaction of H_2 with Ni(100) surface. The dependence of the initial state-selected dissociation probability was obtained analytically on the initial kinetic energy and time. A comparison with other theoretical calculations and experiments is made. The results show that the method can be effectively used to describe the dynamics of reactive gas-surface scattering.     

基于伪布尔可满足性的流水线工位优化设计

鉴于保持流水线生产平衡的基本问题,因此在给定流水线工序、工时以及工位的情况下,通过建立相关数学模型,给出有关的约束条件和目标函数,提出了基于伪布尔可满足性的流水线优化工位设计算法,实现了流水线工位的优化安排,使流水线达到平衡生产.