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31.
运用计算流体力学方法,对多级闪发式海水淡化装置第一级的流动进行了三维数值模拟,分析了闪发室内的水流特性,并将有阻流板的与无阻流板的计算结果进行了比较,数值模拟结果表明,闪发室内存在着大尺度的环流和旋涡,且主导着闪发室内的流态,对闪发效率产生重要影响;阻流板确能很大地改变整个闪发室的水流特性,但目前的阻流板设置方式对提高闪发效率是不利的. 相似文献
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Sherman Hanna Sharon DeVaney Allen Martin 《Journal of Family and Economic Issues》1996,17(3-4):297-311
A computer simulation game designed to give students insights into family time use concepts has been used in an introductory family resource management class at Ohio State University and other universities. The game allows for planning for time use changes over the family life cycle. The game can give students insights into economic and sociological models of time use. It is possible that future versions of the game could be used in family counseling.His research interests include derivation of optimal decision-making rules for families and family financial management.Her research interests include financial management over the life course including financial ratios, baby boomers, and retirement. She received her Ph.D. in 1993 from The Ohio State University in Family Resource Management.His research interests include the time trade-offs made between couples, financial planning over the life cycle, and the interaction of time and money between families and their home-based businesses. He received his Ph.D. in 1993 from The Ohio State University in Family Resource Management. 相似文献
33.
Hannu Nurmi 《Theory and Decision》1995,38(1):99-119
The difficulty of making social choices seems to take on two forms: one that is related to both preferences and the method used in aggregating them and one which is related to the preferences only. In the former type the difficulty has to do with the discrepancies of outcomes resulting from various preference aggregation methods and the computation of winners in elections. Some approaches and results which take their motivation from the computability theory are discussed. The latter institution-free type of difficulty pertains to solution theory of the voting games. We discuss the relationships between various solution concepts, e.g. uncovered set, Banks set, Copeland winners. Finally rough sets are utilized in an effort to measure the difficulty of making social choices. 相似文献
34.
Dynamic reliability models with conditional proportional hazards 总被引:1,自引:0,他引:1
A dynamic approach to the stochastic modelling of reliability systems is further explored. This modelling approach is particularly appropriate for load-sharing, software reliability, and multivariate failure-time models, where component failure characteristics are affected by their degree of use, amount of load, or extent of stresses experienced. This approach incorporates the intuitive notion that when a set of components in a coherent system fail at a certain time, there is a jump from one structure function to another which governs the residual lifetimes of the remaining functioning components, and since the component lifetimes are intrinsically affected by the structure function which they constitute, then at such a failure time there should also be a jump in the stochastic structure of the lifetimes of the remaining components. For such dynamically-modelled systems, the stochastic characteristics of their jump times are studied. These properties of the jump times allow us to obtain the properties of the lifetime of the system. In particular, for a Markov dynamic model, specific expressions for the exact distribution functions of the jump times are obtained for a general coherent system, a parallel system, and a series-parallel system. We derive a new family of distribution functions which describes the distributions of the jump times for a dynamically-modelled system. 相似文献
35.
提出了磁盖势阱(MLPW)一种静电装置,该装置是在球形静电势阱的外围加上磁盖而构成的,可用于受控核聚变.通过建立磁盖势阱中带电粒子的运动方程并取单粒子谐振子近似以及运用自洽场的统计方法,球形聚变炉内大量带电粒子的集体行为被计算机所研究和模拟.由于使用了电场与磁场的联合约束,与单独的磁约束或惯性约束受控核聚变相比,所需达到的技术指标将有所改善,工程技术上的难度也会有所降低 相似文献
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基于MCMC稳态模拟的贝叶斯经验费率厘定信用模型 总被引:2,自引:2,他引:2
B黨lmann-Straub model is one of the most famous applications of the Bayesian method for the experience rate making.However,by the traditional B黨lmann-Straub model one cannot get the unbiased posterior estimation of the parameters when there is not sufficient prior information for the structural parameters;What's more,the difficult of computing high dimension numeration limits the application of Bayesian method.This paper introduces the Markov chain Monte Carlo simulaton method based on the Gibbs sampling after analyzing the structure of the B黨lmann-Straub model and sets up the Bayesian credibility model for estimating the predictive risk premium.Also by using the results of the numeration analysis,this paper proves that from this model one can get the posterior distributions of the parameters dynamically and the posterior estimation of the censoring parameters in the situation that exists unknown parameters,as well as improve the precision of the numeration,which can be helpful to find the heterogeneity of the premium. 相似文献
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