检索结果-南通市图书馆

Theoretical study on the reaction mechanism of (CH3)3CO(.) radical with NO

在线全文

学校读者我要写书评

暂无评论

science china Chemistry 2004年第4期47卷 289-294页

作者： ZHAO Hongmei1,2. LIU Kun1, SUN Chengke1 & LI Zonghe1 1. department of Chemistry, beijing normal university,{2., china 2. department of Chemistry, Beihua university, Jilin 132.13, china department of Chemistry Beijing Normal University Beijing China department of Chemistry Beihua University Jilin China

The reaction mechanism of (CH3)3CO? radical with NO is theoretically investigated at the B3LYP/6-31G* level. The results show that the reaction is multi-channel in the single state and triplet state. The potential energy surfaces of reaction paths in the single state are lower than that in the triple state. The balance reaction: (CH3)3CONO(CH3)3CO?+NO, whose potential energy surface is the lowest in all the reaction paths, makes the probability of measuring (CH3)3CO? radical increase. So NO may be considered as a stabilizing reagent for the (CH3)3CO? radical.

关键词： (CH3)3CO. radical DFT reaction mechanism NO

Moderate deviation for super-Brownian motion with immigration

在线全文

学校读者我要写书评

暂无评论

science china Mathematics 2004年第3期47卷 440-452页

作者： ZHANG Mei department of Mathematics, beijing normal university,{2., china department of Mathematics, The Central university of Finance and Economics, beijing 100081, china department of Mathematics Beijing Normal University Beijing China department of Mathematics The Central University of Finance and Economics Beijing China

We prove a moderate deviation principle for a super-Brownian motion with immigration of all dimensions, and consequently fill the gap between the central limit theorem and large deviation principle.

关键词： moderate deviation principle super-Brownian motion with immigration large deviation principle evolution equation

Fuzzy controllers based on some fuzzy implication operators and their response functions

在线全文

学校读者我要写书评

暂无评论

Progress in Natural science:materials International 2004年第1期14卷 16-21页

作者： LI Hongxing 1*, YOU Fei 1 and PENG Jiayin 2.1. department of Mathematics, beijing normal university,{2., china 2. department of Mathematics, Neijiang Teacher's College, Neijiang 641112. china) department of Mathematics Beijing Normal University Beijing 100875 China. department of Mathematics Neijiang Teacher''s College Neijiang 641112 China

The fuzzy controllers constructed by 2. fuzzy implication operators based on CRI algorithm and their response functions are discussed. The conclusions show that the fuzzy controllers constructed by 9 fuzzy implication operators are universal approximators to continuous functions and can be used in practical fuzzy control systems. And these 9 fuzzy implication operators except for Einstein operator intersection are all the adjoint pairs of some fuzzy implication operators. Besides, there are 3 other fuzzy controllers formed by fuzzy implication operators being regarded approximately as fitted functions.

关键词： fuzzy implication operators CRI algorithm fuzzy controllers response functions universal approximators

EFFECT OF La_2._3 ON THE RECRYSTALLIZATION OF MOLYBDENUM WIRES

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1996年第2期9卷 94-98页

作者： ZHANG Jiuxing ZHOU Meiling LIU Danmin ZUO Tieyong(department of materials {2. and engineering,beijing Polytechnic university,beijing 10002.,china) beijing Polytechnic Univ Beijing China

The recrystallization behavior of Mo wires doped with various contents of La2.3,which were prepared by powder metallurgy method,was investigated using TEM and SEM in *** is shown that the recrystallization temperature and recrystallized microstructure of Mo-La2.3 wires are strongly dependent on the La2.3 *** interlocked large grain structure is formed in Mo-La2.3 wires with contents of 0.2.0.4 wt% La2.3,on the other hand,Mo─La2.3 wires containing less than 0.1 or more than 0.8 wt% La2.3 show equiaxed grain *** reason for this is the difference between the longitudinal interparticle spacing and the transverse spacing of La2.3 particles in various Mo-La2.3 wires,which was observed by using TEM.

关键词： molybdenum wire La_2._3 recrystallization

APPLICATION OF MOLECULAR ORBITAL THEORY TO ANALYSIS OF PHASE STABILITY FOR ALLOYS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1993年第3期6卷 145-152页

作者： YIN Hong TAO Kun PAN Jinsheng LI Hengde Tsinghua university,beijing,{2. professor.department of materials science and engineering,Tsinghua university,beijing 100084,{2. Tsinghua Univ Beijing China

The critical _d vahues ( _ ) of the γ/(γ+σ).γ/(γ+μ) and γ/(γ+γ') phase boundaries in some ternar alloy phase diagrams at various temperatures are calculated by averaging the _d values of sererai selected characteristic points at the phase *** equations for the temperature dependence of the critical _d of γ/(γ+σ).γ/(γ+μ) and γ/(γ+γ') phase boundaries are *** accuracy of the analysis is discussed in detail. It is found for the first time that the average value of the bond order _ at the phase boundaries ts also approximatelr a constant and therefore a critical average bond order _ like - can be introduced for the analysts of phase stability

关键词： molecular orbital theory allov phase stabilitv

MEAM Potential with Angular Dependence for TiAl

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2001年第1期20卷 13-17页

作者： Xiaodong Ni, Xitao Wang, Guoliang Chen (Physics department, university of {2. and Technology beijing, beijing 100083, china State Key Laboratory for Advanced Metals and materials, university of {2. and Technology beijing, beijing 100083, china) 北京科技大学新金属材料国家重点实验室北京 100083 北京科技大学北京 100083

The modified embedded atom method (MEAM) is an empirical extension of the embedded atom method (EAM) that includes angular forces. By fitted to the lattice constants, the cohesive energy, the APE (anti-phase boundary) energy, and the vacancy formation energy of TiAl, an accurate MEAM potential is obtained for the TiAl system with L10 structure. The calculation results of the properties of TiAl are in good agreement with experiments and the results of first principle (F.P.) calculations.

关键词： embedded atom method TiAl alloy angular dependence potential intermetallics

Compatibility between glass sealants and electrode materials of solid oxide fuel cells

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2008年第4期27卷 378-383页

作者： PIAO Jinhua SUN Kening Chen Xinbing department of Applied Chemistry Harbin Insstnte of Technology Harbin 150001 China department of materials {2. and engineering Beijing Normal University Beijing 100875 China

BaO-CaO-Al2.3-SiO2.La2.3-B2.3 system glass materials were investigated as sealants for a solid oxide fuel cell （SOFC）. The transition temperature （Tg and the crystal temperature （Td） values decrease greatly with the increase of BaCO3 content when the other components do not change. For the thermal expansion coefficient （TEC） values, the trend is inverse. The sealant has superior thermal expansion coefficient matching properties with La（Sr）MnO3 （LSM） cathode, La（Sr）FeO3 （LSF） cathode, Ni-LDC （La doped CeO2. anode, and Ni-YSZ （yttria stabilized zirconia） cermet anode. The sealant also has superior stability, compatibility, and good bonding characteristic with these electrode materials at 800-900℃. The results indicate that the aluminosilicate system glass sealant possesses superior compatibility with electrode materials of the solid oxide fuel cell

关键词： solid oxide fuel cell aluminosilicate sealant glass-ceramic compatibility interface

Effects of PKCa antisense RNA on human breast cancer cell proliferation and expression of cyclinD1 and CDK4

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 1999年第12期44卷 1110-1114页

作者： SANG Jianli WANG YongchaoLaboratory of Cell Biology , department of Biology, beijing normal university,{2. , china Laboratory of Cell Biology Department of Biology Beijing Normal University Beijing China

The role of PKCα in human breast cancer cell proliferation and expression of cyclinD1 and CDK4 has been investigated using inhibition of PKCα expression by its antisense RNA. When PKCα expression was inhibited the rate of cell proliferation decreased apparently and the levels of cyclinD1 and CDK4 mRNA were lower than the control. The results showed that PKCα, a key member of signal transduction system, played an important role in human breast cancer cell proliferation and had a close relationship with expression of cyclinD1 and CDK4 which control start of cell cycle.

关键词： breast cancer PKCα cell proliferation cyclinD1 CDK4.

A Construction of Characteristic Tilting Modules

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2002年第1期18卷 129-136页

作者： DENG Bang Ming department of Mathematics. beijing normal university.{2.. P. H. china department of Mathematics Beijing Normal University Beijing P. R. China

Associated with each finite directed quiver Q is a quasi-hereditary algebra. the so-called twisted double of the path algebra kQ. Characteristic tilting modules over this class of quasi-hereditary algebras are constructed. Their endonorphism algebras are explicitly described. It turns out that this class of quasi-hereditary algebras is closed under taking the Ringel dual.

关键词： Quasi-hereditary algebra Characteristic tilting module Ringel dual