全文获取类型
收费全文 | 1596篇 |
国内免费 | 71篇 |
完全免费 | 455篇 |
专业分类
数学 | 2122篇 |
出版年
2020年 | 28篇 |
2019年 | 25篇 |
2018年 | 60篇 |
2017年 | 96篇 |
2016年 | 69篇 |
2015年 | 77篇 |
2014年 | 126篇 |
2013年 | 218篇 |
2012年 | 184篇 |
2011年 | 239篇 |
2010年 | 189篇 |
2009年 | 169篇 |
2008年 | 135篇 |
2007年 | 113篇 |
2006年 | 81篇 |
2005年 | 61篇 |
2004年 | 55篇 |
2003年 | 44篇 |
2002年 | 43篇 |
2001年 | 19篇 |
2000年 | 19篇 |
1999年 | 15篇 |
1998年 | 12篇 |
1997年 | 5篇 |
1996年 | 8篇 |
1995年 | 5篇 |
1994年 | 5篇 |
1993年 | 3篇 |
1992年 | 7篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1980年 | 2篇 |
排序方式: 共有2122条查询结果,搜索用时 36 毫秒
1.
Optimality Conditions and Duality for a Class of Nonlinear Fractional Programming Problems 总被引:25,自引:0,他引:25
Z. A. Liang H. X. Huang P. M. Pardalos 《Journal of Optimization Theory and Applications》2001,110(3):611-619
In this paper, we present sufficient optimality conditions and duality results for a class of nonlinear fractional programming problems. Our results are based on the properties of sublinear functionals and generalized convex functions. 相似文献
2.
复亚正定矩阵是正定Hermite矩阵的推广,本文讨论了这一类矩阵张量积的性质,并将实对称矩阵的Schur定理、华罗庚定理和Minkowski不等式推广到较为广泛的复矩阵类. 相似文献
3.
Generalized Chi Square Method for the Estimation of Weights 总被引:17,自引:0,他引:17
Z. S. Zu 《Journal of Optimization Theory and Applications》2000,107(1):183-192
This paper presents a generalized chi square method for the estimation of weights in the analytic hierarchy process and studies its desirable properties such as invariance under transpose, harmony, and rank preservation. A convergent iterative algorithm is given and its practicality is shown by a numerical example. 相似文献
4.
模糊推理是模糊控制的逻辑基础,然而通用的模糊推理CRI算法却缺乏严格的逻辑依据,近期问世的模糊推理全蕴涵三I算法有效地改进了CRI算法。本文研究了全蕴涵三I算法的一般计算公式及其还原性问题,并且得到了一些新的算法,也提出了一些新的观点,文献中已有的结果大多数是本文结果的特例。从而为模糊推理提供了一种新方法。 相似文献
5.
Structure of Degenerate Block Algebras 总被引:12,自引:0,他引:12
Given a non-trivial torsion-free abelian group (A,+,Q), a field F of characteristic 0, and a non-degenerate bi-additive skew-symmetric map
: A
A
F, we define a Lie algebra
=
(A,
) over F with basis {ex | x
A/{0}} and Lie product [ex,ey] =
(x,y)ex+y. We show that
is endowed uniquely with a non-degenerate symmetric invariant bilinear form and the derivation algebra Der
of
is a complete Lie algebra. We describe the double extension D(
, T) of
by T, where T is spanned by the locally finite derivations of
, and determine the second cohomology group H2(D(
, T),F) using anti-derivations related to the form on D(
, T). Finally, we compute the second Leibniz cohomology groups HL2(
, F) and HL2(D(
, T), F).2000 Mathematics Subject Classification: 17B05, 17B30This work was supported by the NNSF of China (19971044), the Doctoral Programme Foundation of Institution of Higher Education (97005511), and the Foundation of Jiangsu Educational Committee. 相似文献
6.
7.
非线性随机效应模型的异方差性检验 总被引:10,自引:0,他引:10
随机效应模型广泛应用于刻画重复测量数据的特征.在该模型中,随机误差的方差包括受试群体内部及受试群体之间两项方差.Zhang和 Weiss 2000年研究了线性随机效应模型的异方差检验,本文对非线性随机效应模型,分别讨论了群体内、群体间和多变量的异方差性的检验问题,得到了检验的score统计量,并讨论了三种情形下,相应的score函数之间的关系.最后给出一个数值例子说明上述方法的有用性. 相似文献
8.
Coordination of a Supply Chain with One-Manufacturer and Two-Retailers Under Demand Promotion and Disruption Management Decisions 总被引:10,自引:0,他引:10
Increasingly, customer service, rapid response to customer requirements, and flexibility to handle uncertainties in both demand
and supply are becoming strategic differentiators in the marketplace. Organizations that want to achieve these benchmarks
require sophisticated approaches to conduct order promising and fulfillment, especially in today’s high-mix low-volume production
environment. Motivated by these challenges, the Available-to-Promise (ATP) function has migrated from a set of availability
records in a Master Production Schedule (MPS) toward an advanced real-time decision support system to enhance decision responsiveness
and quality in Assembly To Order (ATO) or Configuration To Order (CTO) environments. Advanced ATP models and systems must
directly link customer orders with various forms of available resources, including both material and production capacity.
In this paper, we describe a set of enhancements carried out to adapt previously published mixed-integer-programming (MIP)
models to the specific requirements posed by an electronic product supply chain within Toshiba Corporation. This model can
provide individual order delivery quantities and due dates, together with production schedules, for a batch of customer orders
that arrive within a predefined batching interval. The model considers multi-resource availability including manufacturing
orders, production capability and production capacity. In addition, the model also takes into account a variety of realistic
order promising issues such as order splitting, model decomposition and resource expediting and de-expediting. We conclude
this paper with comparison of our model execution results vs. actual historical performance of systems currently in place. 相似文献
9.
H. S. Yan 《Journal of Optimization Theory and Applications》2000,104(3):659-689
This paper explores the problem of hierarchical stochastic production planning (HSPP) for flexible automated workshops (FAWs), each consisting of a number of flexible manufacturing systems (FMSs). The objective is to devise a production plan which tells each FMS how many parts to produce and when to produce them so as to simultaneously minimize the amount of work in progress, maximize the machine utilization, and satisfy demands for finished products over a finite horizon of N time periods. Here, the problem formulation includes not only uncertainty in demand, capacities, and material supply (which is standard in the literature), but also uncertainties in processing times, rework, and waste products. It considers also multiple products and multiple time periods. This is in contrast to most work which looks at either a single periods or at an infinite horizon. The delay interaction aspect arises from taking into account the transportation of parts between FMSs. Apparently, any job which requires processing on more than one FMS cannot be transported directly from one FMS to the next. Instead, a semifinished product completed in one period must be put into shop storage until some future time period at which it can be transported to the next FMS for further processing. Herein, a stochastic interaction/prediction algorithm is developed by using standard calculus of variations techniques. By means of the software package developed, many HSPP examples have been studied, showing that the algorithm is very effective. 相似文献
10.