检索结果-南通市图书馆

Hydrothermal Synthesis,Crystal Structure and Properties of Inorganic-Organic Hybrid Materials Based on Diphosphopentamolybdate

在线全文

学校读者我要写书评

暂无评论

Journal of wuhan university of Technology(Materials Science) 2008年第3期23卷 407-410页

作者：靳素荣 school of Science Wuhan University of Technology

The compound of diphosphopentamolybdate { [Cu（en）（Hen）]2[P2Mo5O23. }·3.2O [en=ethylenediamine] had been obtained from the hydrothermal method and characterized by single crystal X-ray diffraction, elemental analysis, FT-IR, and thermogravimetric analysis The structure consist of [P2Mo5O23.^6- clusters anions, complex [Cu（en）（Hen）]^3. cations and crystallization water molecules, which are held together to a two-dimensional framework The most interesting feature of the compound is that two nitrogen atoms are both coordinated with Cu（ Ⅱ ） in one ethylenediamine molecule, for the other ethylenediamine molecule, only one nitrogen atom is towards Cu（ Ⅱ） and the other nitrogen atom is protonated and formed Hen^＋.

关键词： polyoxometalate hydrothermal synthesis crystal structure coordination groups

Secure, dependable and publicly verifiable distributed data storage in unattended wireless sensor networks

在线全文

学校读者我要写书评

暂无评论

Science china(information Sciences) 2010年第5期53卷 964-979页

作者： REN Wei 1 , REN Yi 2 & ZHANG Hui 3.1 school of Computer Science, china university of Geosciences ({3.), {3. 43.074, china 2 Department of information and Communication Technology, university of Agder (UiA), Norway 3.Department of Electronics, Politecnico di Torino (POLITO), Italy school of Computer Science China University of Geosciences (Wuhan) Department of information and Communication Technology University of Agder Department of Electronics Politecnico di Torino

In unattended wireless sensor networks (UWSNs), sensed data are stored locally or at designated nodes and further accessed by authorized collectors on demand. This paradigm is motivated by certain scenarios where historical or digest data (e.g., average temperature in a day), instead of real-time data, are of interest. The data are not instantly forwarded to a central sink upon sensing, thereby saving communication energy for transmission. Such a paradigm can also improve data survivability by making use of distributed data storage in cheap flash memory on nodes. However, the security and dependability of such data storage are critical for the future data accessibility in UWSNs. To address this issue, we propose a secure and dependable distributed storage scheme for UWSNs. Our scheme takes advantages of both secret sharing and Reed-Solomon code, which can achieve computational security and maintain low communication overhead in terms of shortened data dispersing size. We also propose a general coding method to publicly verify data integrity in a distributed manner, with low communication and storage overhead, and without the need of holding original data. The extensive analysis justifies that our scheme can provide secure, dependable and publicly verifiable distributed data storage in UWSNs even in the presence of node compromise and Byzantine failure.

关键词： secure storage dependability data integrity wireless sensor networks wireless network security

Power functions with low uniformity on odd characteristic finite fields

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 Mathematics 2010年第8期53卷 1931-1940页

作者： ZHA ZhengBang 1,3.& WANG XueLi 2 1 school of Mathematical Sciences,Luoyang Normal university,Luoyang 471022,china 2 school of Mathematical Sciences,south china Normal university,Guangzhou 51063.,china 3.State Key Laboratory of information Security,Graduate university of Chinese Academy of Sciences,Beijing 100049,china school of Mathematical Sciences Luoyang Normal University school of Mathematical Sciences South China Normal University State Key Laboratory of information Security Graduate University of Chinese Academy of Sciences

In this paper,we give some new low differential uniformity of some power functions defined on finite fields with odd *** corollaries of the uniformity,we obtain two families of almost perfect nonlinear functions in GF... 详细信息

关键词： almost perfect nonlinear function differential uniform function finite field

Transport network and flow mechanism of shallow ore-bearing magma in Tongling ore cluster area

在线全文

学校读者我要写书评

暂无评论

Science china Earth Sciences 2006年第4期49卷 397-407页

作者： DENG Jun1,2, WANG Qingfei1,2 , HUANG Dinghua3., WAN Li4, YANG Liqiang1,2 & GAO Bangfei1,2 1. State Key Laboratory of Geological Processes and Mineral Resources, china university of Geosciences, Beijing 100083. china 2. Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, china university of Geo- sciences, Beijing 100083. china 3. Faculty of Earth Sciences, china university of Geosciences, wuhan 43.074, china 4. school of Mathematics and information Science, Guangzhou university, Guangzhou 510405, china State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing China Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education China University of Geosciences Beijing China Faculty of Earth Sciences China University of Geosciences Wuhan China school of Mathematics and information Science Guangzhou University Guangzhou China

Abundant studies revealed that shallow intrusions of the Yanshanian epoch resulted in the mass mineralization of the Tongling region. Various evidences showed there existed a concealed magma chamber at ?10 km depth in the middle part of this region during Yanshanian epoch, from which the ore-forming magma was generated and then transported to the superficial layer. Yet the transport network and flow mechanism of the shallow ore-bearing magma, the key problem associ- ated with ore-forming process, was relatively little focused on. Integrate analysis of structural me- chanics, statistical fractal and geological facts suggested that NE trending high-angle fold-related thrust faults and the tessellated basement ones served as the main pathways for the shallow magma’s transporting, moreover, the saddle void spaces among adjacent strata in the folds upon this fault system provided the place for magma’s emplacement. So the folds in the upper part and faults in the lower part of the upper crust constituted the fluid’s transport and emplacement network. During the deformation of geologic body with multi-layer structure, the layers in the upper part tended to fold when received the jacking stress from the lower part, while the lower one inclined to fault undergoing loads of the upper part. And the producing probability of this structure assemblage was highly in- creased in the condition, such as in the Tongling area, that the mechanic rigidity of the lower layers was stronger than that of the upper ones. For the pre-existence of fluid-conducting network, the top magma with high volatile in the magma chamber transported rapidly to the superficial layer in dyking pattern, located in the void spaces of folds, filled and reconstructed them. The sudden drop of pres- sure caused the fluid unmixing from the magma and mass ore-forming elements concentration. Pulse activity of the dyking may be the principal reason why magmatic bodies in the Tongling area were spatially-temporally con

关键词： Tongling, structural network, magma intrusion, fractal, dyke.

Adaptive quasi-likelihood estimate in generalized linear models

在线全文

学校读者我要写书评

暂无评论

Science china Mathematics 2005年第6期48卷 829-846页

作者： CHEN Xia & CHEN Xiru school of Mathematics and Statistics, wuhan university, wuhan 43.072, china Graduate school, Chinese Academy of Science, Beijing 100049, china school of Mathematics and Statistics Wuhan University Wuhan China Graduate school Chinese Academy of Science Beijing China

This paper gives a thorough theoretical treatment on the adaptive quasilikelihood estimate of the parameters in the generalized linear models. The unknown covariance matrix of the response variable is estimated by the sample. It is shown that the adaptive estimator defined in this paper is asymptotically most efficient in the sense that it is asymptotic normal, and the covariance matrix of the limit distribution coincides with the one for the quasi-likelihood estimator for the case that the covariance matrix of the response variable is completely known.

关键词： generalized linear models, quasi likelihood estimate, adaptive estimate.

Genistein stimulates osteoblastic differentiation via p3. MAPK-Cbfa1 pathway in bone marrow culture

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2007年第10期28卷 1597-1602页

作者： Qing-chuan LIAO~2,Zhou-sheng XIAO~(4,5),Yan-fang QIN~3.Hong-hao ZHOU~4~2 Affiliated Children's Hospital,Nanjing Medical university,Nanjing 210008,china,~3.Department of Pathology,school of Medicine,Jinanuniversity,Guangzhou 51063.,china ~4 Institute of Clinical Pharmacology,central south university,Changsha 410078,china Childrens Hospital Nanjing Medical University Nanjing 210008 China

Aim:To test the hypothesis that genistein stimulates the osteoblastic differentia-tion through the p3. mitogen activated protein kinase (MAPK)-core-binding fac-tor 1 (Cbfa1) ***:The activation of p3. MAPK was detected byWestern *** phosphatase (ALP) activity and calcium depositionwere assessed for osteoblastic differentiation of bone marrow-derived mesenchy-mal stem cell (BMSC) *** expression of Cbfa1 was analyzed at both themRNA and protein *** activity of Cbfa1 was detected by electrophoreticmobility shift *** sialoprotein (BSP),ALP,osteocalcin (OC),andosteopontin (OPN) gene transcription were also evaluated by either RT-PCR orNorthern ***:Genistein (0.01-1 μmol/L) dose dependently led tothe rapid and sustained activation of the p3. MAPK pathway in mouse *** with genistein (1 μmol/L) resulted in increased ALP activityand calcium deposition of BMSC cultures as a function of *** alsoenhanced Cbfa1 DNA binding activity and promoted the expressions of Cbfa1itself as well as several Cbfa1-regulated genes,including ALP,BSP,OC,and *** treatment with p3. MAPK inhibitor (SB203.80) diminished thegenistein-induced osteoblastic maturation and p3. MAPK-Cbfa1 activation inmouse BMSC ***:These results indicated that genistein couldstimulate the osteoblastic differentiation of BMSC cultures through the p3.MAPK-Cbfa1 pathway.

关键词： bone marrow-derived mesenchymal stem cells core-binding factor 1 osteoblastic differentiation genistein mitogen-activated protein kinase

Rate of strong consistency of quasi maximum likelihood estimate in generalized linear models

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 Mathematics 2004年第6期47卷 882-893页

作者： YUE Li & CHEN Xiru school of Mathematics and Statistics, wuhan university, wuhan 43.072, china Graduate school, Chinese Academy of Sciences, Beijing 10003., china school of Mathematics and Statistics Wuhan University Wuhan China Graduate school Chinese Academy of Sciences Beijing China

Under the assumption that in the generalized linear model (GLM) the expectation of the response variable has a correct specification and some other smooth conditions, it is shown that with probability one the quasi-likelihood equation for the GLM has a solution when the sample size n is sufficiently large. The rate of this solution tending to the true value is determined. In an important special case, this rate is the same as specified in the LIL for iid partial sums and thus cannot be improved anymore.

关键词： quasi-likelihood function generalized linear models strong consistency

Characterization of Type p Banach Spaces by the Weak law of Large Numbers

在线全文

学校读者我要写书评

暂无评论

wuhan university Journal of Natural Sciences 2002年第1期7卷 14-19页

作者： Gan Shi-xin school of Mathematics and Statistics, wuhan university, wuhan 43.072, Hubei, china school of Mathematics and Statistics Wuhan University Wuhan Hubei China

For weighted sums of the form ?j = 1kn anj Xnj\sum {_{j = 1}^{k_n } } a_{nj} X_{nj} where {a nj , 1 ?j?k n ↑∞,n?1} is a real constant array and {X aj , 1≤j≤k n, n≥1} is a rowwise independent, zero mean, random element array in a real separable Banach space of typep, we establishL r convergence theorem and a general weak law of large numbers respectively, conversely, we characterize Banach spaces of typep in terms of convergence inr-th mean and probability for such weighted sums.

关键词： Key words Banach space of typep array of random elements weighted sums weak law of large numbers {a nj } uniform integrability L r convergence convergence in probability

A Note on Abelian Extensions

在线全文

学校读者我要写书评

暂无评论

wuhan university Journal of Natural Sciences 2008年第1期13卷 6-8页

作者： YU Chuxiong1,2, FAN Yun3.1. school of Mathematics and Statistics, wuhan university, wuhan 43.072, Hubei, china 2. school of Mathematics and Computer Science, Jianghan university, wuhan 43.056, Hubei, china 3. school of Mathematics and Statistics, Huazhong Normal university, wuhan 43.079, Hubei, china school of Mathematics and Statistics Wuhan University Wuhan China school of Mathematics and Computer Science Jianghan University Wuhan China school of Mathematics and Statistics Huazhong Normal University Wuhan China

Let K/Q be any abelian extension where Q is the field of rational numbers. By Galois theory and the Frobenius formula for induced characters, we prove that there exists a metabelian group G and an irreducible characte... 详细信息

关键词： abelian extensions metabelian groups induced characters Galois groups