检索结果-南通市图书馆

THE CONVERGENCE OF A NEW MODIFIED BFGS METHOD WITHOUT LINE SEARCHES FOR UNCONSTRAINED OPTIMIZATION OR COMPLEXITY SYSTEMS

在线全文

学校读者我要写书评

暂无评论

Journal of Systems science & Complexity 2010年第4期23卷 861-872页

作者： Liying LIU Zengxin WEI Xiaoping WU College of mathematics {1. Liaocheng University Liaocheng 252059 China College of mathematics and Information {1. Guangxi University Nanning 530004 China school of Management Xi'an Jiaotong University Xi'an 710049 China

In this paper,a new modified BFGS method without line searches is *** traditionalBFGS method,this modified BFGS method is proposed based on the so-called fixed steplengthstrategy introduced by Sun and *** some suitable assumptions,the global convergence andthe superlinear convergence of the new algorithm are established,*** some preliminarynumerical experiments,which shows that the new Algorithm is feasible,is also reported.

关键词： BFGS method complexity systems global convergence superlinear convergence unconstrained optimization.

Intermediate processes and critical phenomena: Theory, method and progress of fractional operators and their applications to modern mechanics

在线全文

学校读者我要写书评

暂无评论

science China(Physics,Mechanics & Astronomy) 2006年第3期49卷 257-272页

作者： XU Mingyu1.& TAN Wenchang2 1. Institute of Applied mathematics, {1. of Math & System science, shandong university, Jinan 2501.0, China 2. State Key Laboratory of Turbulence and Complex Systems & Department of Mechanics and Engineering science, Peking university, Beijing 1.0871. China 1. Institute of Applied mathematics School of Math & System Science Shandong University Jinan 250100 China 2. State Key Laboratory of Turbulence and Complex Systems & Department of Mechanics and Engineering science Peking University Beijing 100871 China

From point of view of physics, especially of mechanics, we briefly introduce fractional operators (with emphasis on fractional calculus and fractional differential equa- tions) used for describing intermediate processes and critical phenomena in physics and mechanics, their progress in theory and methods and their applications to modern me- chanics. Some authors’ researches in this area in recent years are included. Finally, prospects and evaluation for this subject are made.

关键词： fractional operators,intermediate processes,critical phenomena,modern mechanics

Uniform estimate for maximum of randomly weighted sums with applications to insurance risk theory

在线全文

学校读者我要写书评

暂无评论

science China {1. 2005年第10期48卷 1379-1394页

作者： WANG Dingcheng~1.SU Chun~2 & ZENG Yong~1.1. school of Management and school of Applied mathematics,university of Electronic science and Technology of China,Chengdu 61.054,China 2. Department of Statistics and Finance,university of science and Technology of China,Hefei 230026,China 1. school of Management and school of Applied mathematics University of Electronic Science and Technology of China 610054 Chengdu China 2. Department of Statistics and Finance University of Science and Technology of China 230026 Hefei China

This paper obtains the uniform estimate for maximum of sums of independent and heavy-tailed random variables with nonnegative random weights, which can be arbitrarily dependent of each other. Then the applications to ... 详细信息

关键词： dependent stochastic return, discount factor, heavy-tails, discrete time insurance risk model, maxima of randomly weighted sums, ruin probability, tail probabilities, uniformly asymptotic estimate.

EXISTENCE OF POSITIVE SOLUTION TO SUPERLINEAR SEMIPOSITONE SINGULAR m-POINT BOUNDARY VALUE PROBLEMS

在线全文

学校读者我要写书评

暂无评论

Annals of Differential Equations 2008年第4期24卷 490-497页

作者： Zhang Xingqiu (school of {1., liaocheng university, liaocheng 252059, shandong)

Sufficient conditions for the existence of positive solution to superlinear semi-positone singular m-point boundary value problem are given by cone expansion and compression theorem in norm type.

关键词： semipositone superlinear singular m-point boundary value fixed point theorem positive solution

Weighted composition operators between μ-Bloch spaces on the unit ball

在线全文

学校读者我要写书评

暂无评论

science China {1. 2005年第10期48卷 1349-1368页

作者： ZHANG Xuejun~1.& XIAO Jianbin~2 1. College of mathematics and Computer {1.,Hunan Normal university,Changsha 41.006,China(email:xuejunttt@263. net) 2. The school of {1.,Hangzhou Dianzi university,Hangzhou 31.037,China 1. College of mathematics and Computer {1. Hunan Normal University 410006 Changsha China 2. The school of {1. Hangzhou Dianzi University 310037 Hangzhou China

In this paper,necessary and sufficient conditions are given for the weighted composition operator T_(ψ,ψ) to be bounded or compact from the space β_μ to β_ν (or β_(μ,0) to β_(ν,0) ) on the unit ball of C^***... 详细信息

关键词： μ-Bloch space, weighted composition operator, boundedness, compactness.

Prediction for RNA planar pseudoknots

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6期17卷 717-724页

作者： Li Hengwu1.2, Zhu Daming1. Liu Zhendong1.and Li Hong2(1. school of Computer {1. and Technology, shandong university, Jinan 2501.0, China 2. Department of Computer, shandong Economic university, Jinan 25001., China) [a]school of Computer {1. and Technology Shandong University Jinan China [b]Department of Computer Shandong Economic University Jinan China

Based on m-stems and semi-extensible structure, a model is presented to represent RNA planar pseudoknots, and corresponding dynamic programming algorithm is designed and implemented to predict arbitrary planar pseudoknots and simple non-planar pseudoknots with O(n4) time and O(n3) space. The algorithm folds total 245 sequences in the Pseudobase database, and the test results indicate that the algorithm has good accuracy, sensitivity and specificity.

关键词： algorithm RNA secondary structure pseudoknot dynamic programming.

An exact solution for flow past an accelerated horizontal plate in a rotating fluid with the generalized Oldroyd-B model

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 Mechanica Sinica 2009年第4期25卷 463-469页

作者： Jianhong Kang Mingyu Xu Institute of Applied mathematics,{1. of mathematics and System science,shandong university, 2501.0 Jinan, China Institute of Applied mathematics School of Mathematics and System Science Shandong University 250100 Jinan China

In this paper, the generalized Oldroyd-B with fractional calculus approach is used. An exact solution in terms of Fox-H function for flow past an accelerated horizontal plate in a rotating fluid is obtained by using discrete Laplace transform method. A comparison among the influence of various parameters in the Oldroyd-B model and the angular velocity of the fluid on the velocity profiles is made through numerical method in graphic form.

关键词： Generalized Oldroyd-B model Rotating fluid Accelerated plate Exact solution

Sustainable Intensification and Large-scale Operation of Cultivated Land Use at the Farmers’ Scale:A Case Study of shandong Province,China

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical science 2024年第1期34卷 149-167页

作者： LI Li LYU Xiao ZHANG Anlu NIU shandong PENG Wenlong school of Public Administration Huazhong Agricultural UniversityWuhan430070China Department of Geography University of ZurichZurich8057Switzerland school of Humanities and Law Northeastern UniversityShenyang110169China school of Geography and Tourism Qufu Normal UniversityRizhao276800China

Sustainable intensification of cultivated land use(SICLU) and large-scale operations(LSO) are widely acknowledged strategies for enhancing agricultural ***,the existing literature has faced challenges in precisely defining SICLU and constructing comprehensive indicators,which has hindered the exploration of factors influencing LSO within the SICLU *** address this gap,we integrated self-efficacy theory into the design of an index framework for evaluating *** subsequently employed econometric models to analyze the significant factors that impact *** findings reveal that SICLU can be divided into four key dimensions:intensive management,efficient output,resource conservation,and ecological environment ***,it is crucial to incorporate belief-based cognitive factors into the index system,as farmers’ understanding of fertilizer and pesticide application significantly influences their willingness to engage in ***,we identify grain market turnover as the most influential factor in promoting LSO,with single-factor contribution rates reaching 70.9% for cultivated land transfer willingness and 62.5% for the total planting ***,unlike irrigation and agricultural machinery inputs,increased labor inputs correspond to larger planting areas for *** trend may be attributed to reduced labor availability because of rural labor migration,whereas the reduction in irrigation and agricultural input is contingent on innovations in production practices and the transfer of cultivated land management ***,SICLU dynamically influences LSO,with each index related to SICLU having an optimal range that fosters *** insights offer valuable guidance for policymakers,emphasizing farmers as their central focus,with the adjustment of input and output factors as a means to achieve LSO as the ultimate *** conclusion,we propose research avenues for further enriching the SICLU framework to ensur

关键词： sustainable intensification of cultivated land use(SICLU) self-efficacy status quo bias input and output Boosted Regression Tree willingness to transfer cultivated land cultivated land planting areas shandong,China

Bcklund Transformation and Multiple Soliton Solutions for (3+1.-Dimensional Potential-YTSF Equation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2004年第12期 827-830页

作者： BAI Cheng-Lin,~1.LIU Xi-Qiang,~2 ZHAO Hong~1.1.epartment of Communication Engineering,liaocheng university,{1. 252059,China~2school of Mathematical science,liaocheng university,{1. 252059,China Department of Communication Engineering Liaocheng University Liaocheng 252059 China school of Mathematical {1. Liaocheng University Liaocheng 252059 China

We study an approach to constructing multiple soliton solutions of the (3+1.-dimensional nonlinear evolu-tion *** take the (3+1.-dimensional potential-YTSF equation as an *** the extended homogeneousbalance method,one can find a Backlund transformation to decompose the (3+1.-dimensional potential-YTSF equa-tion into a set of partial differential *** from these partial differential equations,some multiple solitonsolutions for the (3+1.-dimensional potential-YTSF equation are obtained by introducing a class of formal solutions.

关键词： soliton solutions extended homogeneous balance method (3+1.-dimensions potential-YTSF equation