检索结果-南通市图书馆

Stochastic bi-resonance induced by external noise for Ca^2+ signaling in hepatocytes

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2005年第4期48卷 286-291页

作者： ZHANG Jiqian1,2,HOU Zhonghuai1 & XIN Houwen1 1.Department of Chemical Physics,university of Science and Technology of china,Hefei 230026,china 2.college of Physics and Electronic Information,Anhui normal university,Wuhu 241000,china 1. Department of Chemical Physics University of Science and Technology of China 230026 Hefei China 2. college of Physics and Electronic Information Anhui Normal University 241000 Wuhu China

The influence of external noise on intracellular Ca2+ oscillations dynamics in a single cell of rat hepatocytes is *** coherence of noise-induced intracellular Ca2+ oscillations reached two maxima for multiple external noise intensity,indicating the occurrence of external noise stochastic bi-resonance (SBR).This phenomenon is compared with our previous result that was induced by internal ***,the deterministic bifurcation character of the system was also discussed.

关键词： stochastic bi-resonance, environment fluctuation, calcium oscillations.

Optimal Harvesting Control for Age-dependent Nonlinear Time-varying Population System

在线全文

学校读者我要写书评

暂无评论

Optimal Harvesting Control for Age-dependent Nonlinear Time-...

Synthesis and High Pressure Study on Ca_(1-x)Ln_xSiO_3

2011 Chinese Control and Decision Conference（CCDC）

作者： Hong Zhu are with college of Computer,jilin normal university,jilin siping 13.000,china Jun Fu,Yifu Feng is with the college of Mathematics,jilin normal university,jilin siping 13.000,china

The optimal harvesting control problem for agedependent nonlinear time-varying population system is *** existence of optimal harvesting control for the system is proved by using Mazur ***,by making use of the definiti... 详细信息

关键词： Nonlinear time-varying population system Optimal harvesting control Necessary condition Optimality system

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1995年第4期11卷 307-309页

作者： Jinghai YANG Juyuan ZHANG Yizhi GENG (Institute of Solid State Physics, siping normal college, siping, 13.000, china)Bin YAO (State Key Lab. for RSA, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110015, china) siping normal Coll Siping China

In this paper, for the first time, Ca1-xLnxSiO3 (Ln=Y. La, x=0.1, 0.2) was synthesized with three methods of high temperature (HT) under atmospheric pressure (AP), high temperature (HT) combined with high pressure (HP) and sol-gel method. The sample obtained at the stable range of 4.3-5.0 GPa pressure and 1050-1100℃ temperature with HT and HP method has a cubic perovskite structure, which has the minimum lattice parameter of 0.3535 nm so far,the sample with triclinic structure was obtained by sintering at atmosphere, and the sample synthesized with sol-gel method has monoclinic structure. SEM analysis shows that rare earth ions take the lattice site of Ca, but the distribution of rare earth ions in the samples synthesized with HT and HP is not homogeneous.

关键词： Synthesis and High Pressure Study on Ca La SiO x)LnxSiO3

Theoretical study of the interaction mechanism of single-electron halogen bond complexes H_3C…Br-Y(Y=H,CN,NC,CCH,C_2H_3)

在线全文

学校读者我要写书评

暂无评论

Science china chemistry 2010年第1期53卷 216-225页

作者： LI ZhiFeng1,SHI XiaoNing1,TANG HuiAn1 & ZHANG JunYan2 1college of Life Science and chemistry,Tianshui normal university,Tianshui 741001,china 2Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,china 1. college of Life Science and chemistry Tianshui Normal University Tianshui 741001 China2. Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

The characteristics and structures of single-electron halogen bond complexes H3C…Br-Y(Y = H,CCH,CN,NC,C2H3) have been investigated by theoretical calculation *** geometries were optimized and frequencies calculated at the B3LYP/6-311++G *** interaction energies were corrected for basis set superposition error(BSSE) and the wavefunctions obtained by the natural bond orbital(NBO) and atom in molecule(AIM) analyses at the MP2/6-311++G *** each H3C…Br-Y complex,a single-electron Br bond is formed between the unpaired electron of the CH3(electron donor) radical and the Br atom of Br-Y(electron acceptor);this kind of single-electron bromine bond also possesses the character of a"three-electron bond".Due to the formation of the single-electron Br bond,the C-H bonds of the CH3 radical bend away from the Br-Y moiety and the Br-Y bond elongates,giving red-shifted single-electron Br bond *** effects of substituents,hybridization of the carbon atom,and solvent on the properties of the complexes have been *** strengths of single-electron hydrogen bonds,single-electron halogen bonds and single-electron lithium bonds have been *** addition,the single-electron halogen bond system is discussed in the light of the first three criteria for hydrogen bonding proposed by Popelier.

关键词： single-electron halogen bond single-electron hydrogen bond single-electron lithium bond MP2 DFT NBO AIM

Suitability evaluation for land reclamation in mining area:A case study of Gaoqiao bauxite mine

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2011年第S3期21卷 506-515页

作者： WANG Shi-dong1, 2, LIU Chang-hua2, ZHANG He-bing2 1. college of Resources Science and Technology, Beijing normal university, Beijing 100875, china 2. School of Surveying and Land Information Engineering, Henan Polytechnic university, Jiaozuo 454000, china [a] college of Resources Science and Technology Beijing Normal University Beijing 100875 China [b] School of Surveying and Land Information Engineering Henan Polytechnic University Jiaozuo 454000 China

Suitability evaluation plays an important role in land reclamation because the choice of evaluation methods affects the accuracy and objectivity of the suitability evaluation results. Furthermore, it influences the decision-making related to land reclamation. An improved method, which is called limit comprehensive conditions method, was developed after different suitability evaluation methods were studied. Based on this method, the reclaimed land of the Gaoqiao bauxite mining area was evaluated. The Gaoqiao mining area was divided into seven evaluation units that were evaluated respectively by selecting evaluation factors and establishing grade standards. The results show that the proposed method is more applicable and easier to handle. Moreover, its evaluation results are more scientific compared with the traditional evaluation methods. The improved method can be beneficial to the rapid monitoring and the effective management of reclaimed land in the opencast mine area.

关键词： mining area land reclamation suitability evaluation Gaoqiao bauxite mine

Restoration method of characters on Jiagu rubbings based on Poisson distribution and fractal geometry

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2010年第7期53卷 1296-1304页

作者： GU ShaoTong1,2,3, FENG GeFei1,2,3, MA XiaoHu1,2,4 & YANG YiMing1,2,3 1Institute of Linguistics, Xuzhou normal university, Xuzhou 221009, china 2Jiangsu college Key Lab of Linguistic Sciences and Neuro-cognition Engineering, Xuzhou normal university, Xuzhou 221009, china 3Linguistic Science college, Xuzhou normal university, Xuzhou 221009, china 4School of Computer Science and Technology, Soochow university, Suzhou 215006, china 1. Institute of Linguistics Xuzhou Normal University Xuzhou 221009 China2. Jiangsu College Key Lab of Linguistic Sciences and Neuro-cognition Engineering Xuzhou Normal University Xuzhou 221009 China3. Linguistic Science College Xuzhou Normal University Xuzhou 221009 China4. School of Computer Science and Technology Soochow University Suzhou 215006 China

A scheme for character restoration of Jiagu rubbings based on Poisson distribution and fractal geometry is proposed in this paper. The distribution characteristics of the connected regions on Jiagu rubbings is analyzed, and all the connected regions are recognized according to differences between these and their mathematical expectations. Regions are recognized as noise regions and filled if the differences are negative, while stroke regions are reserved. The attributes of the character image edges on Jiagu rubbings are also analyzed. The fractal dimensions of the character edge of Jiagu rubbings are calculated by means of statistics. The feature points are obtained using the cosine of the angle between the two vectors of the point and the consecutive two points. Different compression transformations with weighted coordinates are performed on different strokes and segments of the characters so as to smoothen the character edge of Jiagu rubbings images. Experimental results show that our scheme could successfully clear noise regions and polish the character edge of Jiagu rubbings.

关键词： Jiagu rubbings Poisson distribution fractal geometry fractal dimension compression transformation character restoration

Variable Separation Solution for(1+1)-Dimensional Nonlinear Models Related to Schrdinger Equation

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 Theoretical Physics 2004年第10期42卷 568-572页

作者： XU Chang-Zhi~(1,2) ZHANG Jie-Fang~11 Institute of Nonlinear Physics,Zhejiang normal university,Jinhua 321004,china2 Department of Physics and Mathematics,Jinhua Educational college,Jinhua 321000,china Department of Physics and Mathematics Jinhua Educational College Jinhua 321000 China

A variable separation approach is proposed and successfully extended to the(1+1)-dimensional *** new exact solution of(1+1)-dimensional nonlinear models related to Schr(?)dinger equation by the entranceof three arbitrary functions is *** special types of soliton wave solutions such as multi-soliton wave solution,non-stable soliton solution,oscillating soliton solution,and periodic soliton solutions are discussed by selecting thearbitrary functions appropriately.

关键词： variable separation approach (1+1)-dimensional nonlinear models solution of soliton

Study on the properties of polyaniline for med in KOH solution

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

西南师范大学学报(自然科学版) 1999年第5期24卷 562-565页

作者： Li Nianbing 1,Zhang Shengtao 2,Ding Peidao 3 1 college of chemistry and Chemical Engineering,Southwest china normal university,Chongqing 400715 2 college of chemistry and Chemical Engineering,Chongqing university,Chongqing 400044 3 college of Materi 西南师范大学重庆重庆大学重庆

Electropolymerization of aniline in KOH solution and properties of the polymer were studied by in situ reflex ellipsometry, cyclic voltammetry and fluorescence spectroscopic method. The process of electropolymerization of aniline was different in alkaline and in acidic aqueous media. The complex refractive indices and the fluorescence spectra indicated that the polyaniline was a sort of luminous material.

关键词： polyaniline electropolymerization alkaline solution ellipsometry fluorescence luminous material

Synthesis and Herbicidal Activity of 2-Benzoyliminopyrimido[3,2-b]-1 2,4-Thiadiazolines

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 Chemical Letters 1998年第8期9卷 721-722页

作者： Si Jia XUE Dong Yun TAN Chang You SUN(Department of chemistry, Central china normal university, Wuhan 430079)(Wuhan Food Industry college, Wuhan 430022) Wuhan Food Ind Coll Wuhan 430022 Peoples R China Cent china normal Univ Dept Chem Wuhan 430079 Peoples R China

A series of 2-benzoyliminopyrimido[3,2-b]-1,2,4-thiadiazolines were synthesized and tested for herbicidal effects. All of them are new compounds and their structures were confirmed by (HNMR)-H-1, IR, MS. The prelimina... 详细信息

关键词： pyrimido[3,2-b]-1,2,4-thiadiazoline herbicidal activity synthesis