检索结果-南通市图书馆

The Juancheng chondrite──A new meteorite falling recently in china

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第21期43卷 1834-1837页

作者： CHEN Yongheng 1,2. wang Daode+2.and wang Ruitian+31. {2. of Chemistry, Guangzhou normal university, Guangzhou 510400, china 2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, china 3. Heze Bureau of Seismolo department of Chemistry Guangzhou Normal University Guangzhou China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Heze Bureau of Seismology Shandong Province Heze China

The Juancheng chondrite, a new meteorite falling recently in Juancheng County, Shandong Province, china, is classified as an H5 (S2. chondrite based on the compositions of olivine (Fa= 19.2. σ Fa=0.46) and low-Ca pyroxene (Fs=16.9, σ Fa=0.4). The plagioclase in the Juancheng chondrite is rich in CaO, indicating a relatively high metamorphic temperature the parent body underwent.

关键词： Juancheng ordinary chondrite new meteorite.

The normal numbers of the fuzzy systems and their classes

在线全文

学校读者我要写书评

暂无评论

Science china(Information Sciences) 2010年第11期53卷 2215-2229页

作者： LI HongXing1,3, YUAN XueHai1, wang JiaYin2.& LI YuCheng3 1Faculty of Electronic Information and Electrical Engineering, Dalian university of Technology, Dalian 11602.,{2. 2.chool of Mathematical Sciences, beijing normal university, beijing 100875,{2. 3department of Automation, North{2. university of Technology, beijing 100144,{2. 1. Faculty of Electronic Information and Electrical Engineering Dalian University of Technology Dalian 116024 China3. Department of Automation North China University of Technology Beijing 100144 China2. School of Mathematical Sciences Beijing Normal University Beijing 100875 China

R-fuzzy set is defined in this paper, which is regarded as the generalization of the Zadeh fuzzy set. By means of CRI method, some fuzzy systems are constructed by suitably using several kinds of R-fuzzy sets as fuzzy inference antecedents, such as interpolation fuzzy system, Bernstein fuzzy system, Lagrange fuzzy system and Hermite fuzzy system. A notion of the normal number of the fuzzy system is defined here, we have shown that all fuzzy systems are able to be classified as three classes such as the normal fuzzy systems, the regular fuzzy systems and the singular fuzzy systems under the significance of the normal numbers of fuzzy systems. Finally, the generalized Bernstein polynomial is obtained by constructing Bernstein fuzzy system, it is proved that the generalized Bernstein polynomial is uniformly convergent in C[a,b] under a weaker condition, and it is pointed out that there exist generalized Bernstein polynomials to be not convergent in C[a,b] by use of constructing a counterexample.

关键词： R-fuzzy set fuzzy system the normal number of fuzzy system universal approximation property for fuzzy system

CONVERGENCE IN THE CHEMOSTAT MODELWITH DELAYED RESPONSE IN GROWTH

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 1999年第1期12卷 23-32页

作者： wang Wendi (department of {2., Southwest normal university, Chongqing 400715, china)MA Zhien (department of {2., Xi’an Jiaotong university, Xi’an 710049, china) 西南师范大学数学系重庆西安交通大学数学系陕西西安

The asymptotic behavior of solutions of a model for competition between two microorganisms in the chemostat is studied. The model incorporates time delays that allow for cellular components of each competing species to be structured to include unassimilated or stored nutrient and allow uptake functions to be nonmonotone. By introducing two auxiliary functions and using fluctuation lemma, it is shown that at most one competitor survives, and the substrate and the surviving competitor (if one exists), approach limiting values. Our results indicate this kind of time delays do not influence the competitive outcome except for a critical case. The main results of S. F. Ellermeyer[1] are improved on and extended.

关键词： Chemostat competition time delays global dynamics.

Impact of Mining Activities upon Environment in Panzhihua Region, Southwestern china

在线全文

学校读者我要写书评

暂无评论

地球科学进展 2004年第S1期19卷 449-455页

作者： TENGY~1, NIS~2. wang J~1, ZHANG C~2.XU Z~2.TUO X~2.(1. Institute of Environmental Sciences, beijing normal university, Belling 100875,{2. 2. department of Geochemistry, Chengdu university of Technology, Chengdu 610059,{2.)

Mining activities have left huge uncovered slopes, large areas of gangue ground and extensive railings dams. In this paper, we studied some impacts of mining activities upon environment in Panzhihua region, southwestern china. The environmental impacts include ecological destruction, geological disasters, environmental pollution, land damage, solid waste and occupational health effect in study area. The author suggested that local government should take some measure to reduce environmental impact in Pan...

关键词： Mining activity Environmental impact Pollution Panzhihua region SW china

EXISTENCE　OF　NONTRIVIAL　SOLUTIONS　FOR　CRITICAL　SEMILINEAR　BIHARMONIC　EQUATIONS

在线全文

学校读者我要写书评

暂无评论

Systems Science and Mathematical Sciences 1994年第2期7卷 140-152页

作者： GU Yonggeng(Institute of Systems Science, Academia Sinica, beijing 100080, china)DENG Yinbin({2. of mathematics, Huazhong normal university ,Wuhan 430070, china)wang Xujia({2. of mathematics, Zhejiang university, Hangzhou 31002., china)

ＥＸＩＳＴＥＮＣＥＯＦＮＯＮＴＲＩＶＩＡＬＳＯＬＵＴＩＯＮＳＦＯＲＣＲＩＴＩＣＡＬＳＥＭＩＬＩＮＥＡＲＢＩＨＡＲＭＯＮＩＣＥＱＵＡＴＩＯＮＳ￥ＧＵＹｏｎｇｇｅｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＳｙｓｔｅｍｓＳｃｉｅｎｃｅ，... 详细信息

ＥＸＩＳＴＥＮＣＥＯＦＮＯＮＴＲＩＶＩＡＬＳＯＬＵＴＩＯＮＳＦＯＲＣＲＩＴＩＣＡＬＳＥＭＩＬＩＮＥＡＲＢＩＨＡＲＭＯＮＩＣＥＱＵＡＴＩＯＮＳ￥ＧＵＹｏｎｇｇｅｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＳｙｓｔｅｍｓＳｃｉｅｎｃｅ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｂｅ...

关键词： Nontrivial solution biharmonic equations critical Sobolev exponent.

Variational iteration solving method of a sea-air oscillator model for the ENSO

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第2期17卷 230-232页

作者： MO Jiaqi, LIN Wantao and wang Hui ( department of {2., Anhui normal university, Wuhu 2.1000, china Division of Computational Science, E-Institutes of Shanghai Universities, at SJTU, Shanghai 2.02.0, china LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, beijing 10002., china Chinese Academy of Meteorological Sciences, beijing 100081, china) [a]department of mathematics Anhui Normal University Wuhu China [b]Division of Computational Science E-Institures of Shanghai Universities at SJTU Shanghai China [c]LASG Institute of Atmospheric Physics Chinese Academy of Sciences Bejing China [d]Chinese Academy of Meterological Sciences Beijing China

A time delay equation for sea-air oscillator model is studied. The aim is to create an asymtotic solving method of nonlinear equation for the ENSO model. And based on a class of oscillators of ENSO model, employing the variational iteration method, the approximate solution of corresponding problem is obtained. It is proven from the results that the method of variational iteration method can be used for analyzing the sea surface temperature anomaly in the equatorial eastern Pacific of the atmosphere-ocean oscillation for ENSO model.

关键词： Nonlinear problem, time delay, El Nino-Southern oscillator model variational iteration.

Influence of Turbid Medium Parameters on Back Scattered Intensity and Pulsewidth of Picosecond Pulse

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 813-814页

作者： Li wang, Man Zhao, Shiya Hedepartment of Applied Physics, {2. university of Technology, {2. 10002., china Physics department, Hebei normal university, Shijiazhuang 050016, china department of Applied Physics Beijing University of Technology Beijing 100022 China Physics department Hebei Normal University Shijiazhuang 050016 China

In this paper, we simulate a practical in vivo technique in which is produced influence of turbid medium parameters on backscattered intensity and pulsewidth of picosecond for turbid tissue surface of a semiinfinite medium by a small narrow linewidth laser beams. It is shown that the interaction of the ultra short pulse and the turbid tissue is very used as researching the optical parameters of the turbid medium.

关键词： of et it on in

ASYMPTOTIC normalITY OF MAXIMUM QUASI-LIKELIHOOD ESTIMATORS IN GENERALIZED LINEAR MODELS WITH FIXED DESIGN

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2008年第3期21卷 463-473页

作者： Qibing GAO Yaohua WU Chunhua ZHU Zhanfeng wang School of mathematics and Computer Science Nanjing Normal University Nanjing 210097 China department of Statistics and Finance University of Science and Technology of China Hefei 230026 China School of mathematics Science Anhui University Hefei 230039 China

In generalized linear models with fixed design, under the assumption λ↑_n→∞ and other regularity conditions, the asymptotic normality of maximum quasi-likelihood estimator ^↑βn, which is the root of the quasi-likelihood equation with natural link function ∑i=1^n Xi（yi -μ（Xi′β）） = 0, is obtained, where λ↑_n denotes the minimum eigenvalue of ∑i=1^nXiXi′, Xi are bounded p × q regressors, and yi are q × 1 responses.

关键词： Asymptotic normality fixed design generalized linear models maximum quasi-likelihood estimator

Non-isothermal decomposition kinetics and lifetime of Tb2.0-MBA)6(PHEN)2

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2003年第3期22卷 155-159页

作者： ZHANGJianjun BAIJihai wangRuifen wangShuping LIJibiao ExperimentalCenter NormalUniversityShijiazhuang050016China departmentofComputer HebeiNormalCollegeofScienceandTechnologyChangli066600China departmentofChemistry HebeiNormalUniversityShijiazhuang050091China

The thermal decomposition of Tb_2.O-MBA)_6(PHEN)_2.(O-MBA: o-methylbenzoate;PHEN: 1,10-phenanthroline) and its kinetics were studied under the non-isothermal condition bythermogravimetry-derivative thermogravimetry (TG-DTG) techniques. Kinetic parameters were obtainedfrom analysis of TG-DTG curves by the Achar method and the Madhusudanan-Krishnan-Ninan (MKN) *** most probable mechanism function was suggested by comparing the kinetic parameters. The kineticequation for the first stage can be expressed as dα/dt = Aexp(-E/RT)·3(1 - α)^(2.3). Thelifetime equation at mass loss of 10% was deduced as lnτ= -2..742. + 19797.795/T by isothermalthermogravimetric analysis.

关键词： thermochimica non-isothermal kinetics TG-DTG terbium complex O-methylbenzoate 1,10-phenanthroline