检索结果-南通市图书馆

High-energy radiation from old pulsars

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2010年第S1期53卷 135-138页

作者： JIANG ZeJun1,2.& ZHANG Li2.1 yunnan Astronomical Observatory,National Astronomical Observatories,Chinese Academy of Sciences,kunming 650011,{2. 2.department of Physics,yunnan university,kunming 650091,{2. yunnan Astronomical Observatory National Astronomical Observatories Chinese Academy of Sciences Kunming China department of Physics Yunnan University Kunming China

In this paper,we study nonthermal high energy radiation from old rotation-powered pulsars with ages greater than 106 yr based on the revised outer gap *** this model,the inclination angle and geometry of the magnetic field have been taken into account,and the fractional size f of the outer gap is determined by the electron/positron pair production *** cascade process caused by the back-flowing particles moving from the outer gap to the star will produce the observed nonthermal X-ray emission,and the relativistic particles accelerated in the outer gap will produce gamma-rays via curvature *** nine old pulsars which have been detected to have nonthermal X-rays,we first use the observed nonthermal X-ray emission to estimate reasonable inclination angles,and then estimate their gamma-ray *** also study the possibilities of gamma-ray emissions from other old rotation-powered *** compare our predicted gamma-ray flux with the sensitivities of AGILE and Fermi.

关键词： superbubble HII region cluster PAH dust

Syntheses and Crystal Structures of [Ni（L）2.NCS）2. and [Co（L）2.NCS）2.(L=Azobis（2.pyridine）

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2004年第10期 1123-1126+1090页

作者： ZHAO Qi-Huaa LIU Yu-Qia② FANG Rui-Binb a(department of Chemistry,yunnan {2.,kunming 650091,china) b(School of Pharmacy,yunnan {2.,kunming 650091,china) departmentofChemistry YunnanUniversityKunming650091China SchoolofPharmacy YunnanUniversityKunming650091China

The ligand azobis(2.pyridine) L was used in the synthesis of two new organic-inorganic coordination complexes: [Ni(L)2.NCS)2. 1 and [Co(L)2.NCS)2. 2. Crystal data for 1: monoclinic, space group C2.c, a = 13.361(18), b = 10.731(15), c = 18.14(2. ? β = 109.86(2.? V = 2.46(6) 3, Z = 4, Mr = 543.2., Dc = 1.410 g/cm3, μ = 0.993 mm-1, F(000) = 1064, T = 2.8(2. K, R = 0.0454 and wR = 0.1010 for 12.8 observed reflections with I > 2.(I); and those for 2. monoclinic, space group C2.c, a = 13.35(2., b = 10.806(15), c = 18.06(2. , β = 110.34(2.? Z = 4, Mr = 543.49, Dc = 1.413 g/cm3, μ = 0.902.mm-1, F(000) = 1060, T = 2.8(2. K, R = 0.0699 and wR = 0.1354 for 72. observed reflections with I > 2.(I). Single-crystal X-ray diffraction studies revealed that 1 and 2.have similar structures, in which each Ni(II) or Co(II) cation is coordinated by two L ligands and two terminal thiocynates (NCS-).

关键词： crystal structure azobis (2.pyridine) metal complexes

Wave Solutions for the GinzburgLandau-BBM Equations (I)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Communications in Nonlinear Science and Numerical Simulation 1998年第4期3卷 218-221页

作者： Murong JIANG and Yawei TIAN(department of mathematics,{2., kunming 650091, china)(Graduate School of china Academy of Engineering and Physics, P.O.Box 2.10 Beijing100081, china)(Computer department, Shaanxi Normal university, Xi’an 710062. department of mathematics Yunnan University Kunming 650091 China Graduate School of china Academy of Engineering and Physics P.O.Box 2010 Beijing 100081 China Computer department Shanxi Normal University Xi'an 710062 China

In this paper, the stability of plane wave solutions for the GinzburgLandau-BBM equations are considered. When the coefficients are suitably constrained,these waves are stable.

关键词： stability the Ginzburg- Landau- BBM equations plane wave solutions

Response to“Discussion on the systematic position of the Early Cambrian priapulomorph worms”

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2006年第2期51卷 250-256页

作者： HAN Jian1 & HU Shixue2.1. department of Geology and Key Laboratory for Continental Dynam- ics of the Education Ministry, Northwest university, Xi’an 710069,{2. 2. yunnan Geological Institute, kunming 650011,{2. department of Geology and Key Laboratory for Continental Dynamics of the Education Ministry Northwest University Xi’an China yunnan Geological Institute Kunming China

A response by Han Jian & Hu Shixue to a letter to the editor about their article 'Systematic Position of the Early Cambrian priapulomorph worms' in the 2.04 issue is presented.

关键词： Response to Discussion on the systematic position of the Early Cambrian priapulomorph worms

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

在线全文

同方期刊数据库

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 {2., Beijing 100875, china 2. department of mathematics, Neijiang Teacher's College, Neijiang 641112. china) Beijing Normal Univ Dept Math Beijing 100875 Peoples R 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

Transitional function of DG to CA3 in the hippocampus

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第12期17卷 1436-1444页

作者： Yan Chuankui1 and Liu Shenquan2.1. department of mathematics, Hangzhou Normal {2., Hangzhou 310036, china 2. department of Applied mathematics, School of Mathematical Sciences, South china {2. of Technology, Guangzhou 510640, china) department of mathematics Hangzhou Normal University Hangzhou 310036 China department of Applied mathematics School of Mathematical Sciences South China University of Technology Guangzhou 510640 China

Using single cell channel model, the transmission features of CA3-DG network in the hippocampus are investigated. The influence of the stimulation on discharge pattern of pyramidal neurons is analyzed, which shows that it starts with period spiking discharges, followed by period-doubling bifurcation to chaos, and period 3 discharge evolving into chaos, and ultimately a period of bursting discharges. By the synaptic model, the CA3-DG network model is constructed, which analyzes the summation of postsynaptic currents in the network, the influence of postsynaptic current on discharge rhythm as well as the mechanism of bursting discharges. The strong capacity of spatiotemporal encoding in the network indicates the features of CA3 network during the information transmission process in the hippocampus. The modeling result with time delay of the synaptic transmission is in accordance with the experimental phenomena of action potential in the hippocampus.

关键词： hippocampus CA3-DG period-doubling bifurcation chaos.

K-uniformly rotund spaces and k-uniformly smooth spaces

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第2期43卷 92-95页

作者： Suyalatu 1 and WU Congxin 2.1. department of mathematics,Inner Mongolia Normal {2., Huhhot 01002., china 2. department of mathematics, Harbin Institute of Technology, Harbin 150006, china department of mathematics Inner Mongolia Normal University Huhhot China department of mathematics Harbin Institute of Technology Harbin China

The conception of k_uniform smoothness (KUS) is introduced. It is the extension of the conception of uniform smoothness. It is proved that the k_uniform smoothness and Sullivan’s K_uniform rotundity (KUR) are the daul notions. X+* is a KUR space if and only if X is a KUS space, X+* is a KUS space if and only if X is a KUR space. If X is a KUS space, then X is a (K+1)US space. It is also proved that the KUS space includes the Nan’s k_strongly smooth space.

关键词： K_uniform smoothness K_uniform convexity.

Microwave Effect On Partial Oxidation of Methane to Syngasover Ni/ZrO_2

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第8期9卷 775-777页

作者： Xian Jun BI Xiao Guang XIE Ai Hong DUAN Pin Jie HONG Shu Shan DAI(department of Chemistry, yunnan Normal {2., kunming 650092.(department of Chemistry, yunnan university, kunming 650091) department of Chemistry Yunnan Normal University Kunming 650092 China department of Chemistry Yunnan University Kunming 650091 China

The partial oxidation of methane to syngas over Ni/ZrO2.catalyst irradiated by ndcrowave has been studied. Compared with a conventional heating mode, the temperature of the catalytic bed is much lower and there is a h... 详细信息

关键词： microwave partial Oxidation methane syngas Ni/ZrO_2

CMC surfaces in the hyperbolic 3-space

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第7期43卷 547-550页

作者： YU Zuhuan 1, 2.and LI Zhenqi 1, 3 1. Institute of mathematics, Fudan university, Shanghai 2.0433,{2. 2. department of mathematics,Sichuan Union university, Chengdu 610064,{2. 3. department of mathematics, Nanchang university, Nanchang 33 nstitute of Mathemalics Fudan University Shanghai China department of mathematics Sichuan Union University Chengdu China department of mathematics Nanchang University Nanchang China

CMC-H surfaces satisfying H≥1 are studied. It is proved that these surfaces possess a natural representation which is a generalization of the Bryant’s result.

关键词： hyperbolic space CMC surface Weierstrass representation.