全文获取类型
收费全文 | 3059篇 |
免费 | 172篇 |
国内免费 | 78篇 |
专业分类
管理学 | 532篇 |
劳动科学 | 4篇 |
民族学 | 28篇 |
人才学 | 1篇 |
人口学 | 28篇 |
丛书文集 | 308篇 |
理论方法论 | 85篇 |
综合类 | 2062篇 |
社会学 | 45篇 |
统计学 | 216篇 |
出版年
2024年 | 33篇 |
2023年 | 75篇 |
2022年 | 93篇 |
2021年 | 85篇 |
2020年 | 92篇 |
2019年 | 84篇 |
2018年 | 85篇 |
2017年 | 79篇 |
2016年 | 89篇 |
2015年 | 124篇 |
2014年 | 236篇 |
2013年 | 219篇 |
2012年 | 255篇 |
2011年 | 276篇 |
2010年 | 218篇 |
2009年 | 199篇 |
2008年 | 172篇 |
2007年 | 174篇 |
2006年 | 147篇 |
2005年 | 107篇 |
2004年 | 94篇 |
2003年 | 87篇 |
2002年 | 68篇 |
2001年 | 49篇 |
2000年 | 39篇 |
1999年 | 28篇 |
1998年 | 18篇 |
1997年 | 17篇 |
1996年 | 14篇 |
1995年 | 12篇 |
1994年 | 9篇 |
1993年 | 5篇 |
1992年 | 8篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1987年 | 3篇 |
排序方式: 共有3309条查询结果,搜索用时 15 毫秒
1.
蔡之兵 《吉首大学学报(社会科学版)》2020,41(3):67-76
每当先进的发展制度开始取代落后的发展制度时,整个世界格局就会进入重大的转换阶段。在中国五千年的发展历史中,有两次重大的历史变局完全改变了中国历史发展轨迹并深远地影响了当前中国的发展模式。新时代下的中国作为前两次历史变局影响的客体,曾经既是先进发展制度取代落后发展制度的受益者,也经历过作为落后发展制度主体而被先进发展制度冲击的过程。目前世界正处于第三次先进发展制度与落后发展制度交替的历史变局阶段,作为第三次重大历史变局的主体,在三次千年历史变局叠加的背景下,能否有效地认识、适应并改造利用前两次历史变局的经验与教训,构建系统性、科学性、可行性、领先性的中国特色社会主义制度,将决定中国在本次历史变局中能否顺利成为先进发展制度的主体从而实现民族复兴。 相似文献
2.
Integrating Operational and Organizational Aspects in Interdependent Infrastructure Network Recovery
Camilo Gomez Andrs D. Gonzlez Hiba Baroud Claudia D. Bedoya‐Motta 《Risk analysis》2019,39(9):1913-1929
Managing risk in infrastructure systems implies dealing with interdependent physical networks and their relationships with the natural and societal contexts. Computational tools are often used to support operational decisions aimed at improving resilience, whereas economics‐related tools tend to be used to address broader societal and policy issues in infrastructure management. We propose an optimization‐based framework for infrastructure resilience analysis that incorporates organizational and socioeconomic aspects into operational problems, allowing to understand relationships between decisions at the policy level (e.g., regulation) and the technical level (e.g., optimal infrastructure restoration). We focus on three issues that arise when integrating such levels. First, optimal restoration strategies driven by financial and operational factors evolve differently compared to those driven by socioeconomic and humanitarian factors. Second, regulatory aspects have a significant impact on recovery dynamics (e.g., effective recovery is most challenging in societies with weak institutions and regulation, where individual interests may compromise societal well‐being). And third, the decision space (i.e., available actions) in postdisaster phases is strongly determined by predisaster decisions (e.g., resource allocation). The proposed optimization framework addresses these issues by using: (1) parametric analyses to test the influence of operational and socioeconomic factors on optimization outcomes, (2) regulatory constraints to model and assess the cost and benefit (for a variety of actors) of enforcing specific policy‐related conditions for the recovery process, and (3) sensitivity analyses to capture the effect of predisaster decisions on recovery. We illustrate our methodology with an example regarding the recovery of interdependent water, power, and gas networks in Shelby County, TN (USA), with exposure to natural hazards. 相似文献
3.
介绍了高性能定点可重构DSP处理器的数据通路设计。该数据通路以功能强大的16位定点计算单元为基础,搭建起高速16位数据处理平台;并能以单指令流多数据流的方式灵活支持多维向量运算;通过重构的方法有效地支持了32位数据处理。 相似文献
4.
OLIVIER CAPPÉ RANDAL DOUC ERIC MOULINES & CHRISTIAN ROBERT 《Scandinavian Journal of Statistics》2002,29(4):615-635
While much used in practice, latent variable models raise challenging estimation problems due to the intractability of their likelihood. Monte Carlo maximum likelihood (MCML), as proposed by Geyer & Thompson (1992 ), is a simulation-based approach to maximum likelihood approximation applicable to general latent variable models. MCML can be described as an importance sampling method in which the likelihood ratio is approximated by Monte Carlo averages of importance ratios simulated from the complete data model corresponding to an arbitrary value of the unknown parameter. This paper studies the asymptotic (in the number of observations) performance of the MCML method in the case of latent variable models with independent observations. This is in contrast with previous works on the same topic which only considered conditional convergence to the maximum likelihood estimator, for a fixed set of observations. A first important result is that when is fixed, the MCML method can only be consistent if the number of simulations grows exponentially fast with the number of observations. If on the other hand, is obtained from a consistent sequence of estimates of the unknown parameter, then the requirements on the number of simulations are shown to be much weaker. 相似文献
5.
韩立军 《内蒙古工业大学学报》2002,21(1):50-52
本文给出一类非均匀弦的横向振动的最佳控制,推广了P C Park的结果。这一结果同样适用于同类型振动问题。 相似文献
6.
王峰 《南京工业大学学报(社会科学版)》2003,2(3):48-52
随着经济的发展 ,法制的完善以及审判方式改革的深化 ,法院调解这一纠纷解决方式以其独特的优点 ,在司法实践中 ,越来越显示其重要性。时代赋予法院调解新的价值的同时 ,也使其原有的法律规定弊端凸现。本文拟从法院调解三原则的地位分析中寻找促进和规范法院调解的途径 ,并运用新证据规则加以落实。 相似文献
7.
张日美 《北京交通大学学报(社会科学版)》2008,7(2):104-108
将无抵触理论应用于公共英语教学,可以对外语学习活动进行设计,使学习者水平与任务的难度相当、培养语言学习兴趣、加强师生交流、确保学习者获得学习主动权等,使其在学习过程中体验到巨大乐趣,进入以注意力高度集中和全身心投入为特征的无抵触心理状态,提高学习效率。 相似文献
8.
陈忠 《长江大学学报(社会科学版)》2003,(2)
提出了一种求解等式约束优化问题的异步并行拟牛顿方法 .若假设目标函数 f和约束函数h至少三次连续可微 ,且△h(x)对任意x∈Rn 均为满秩矩阵 ,证明了所提出的异步并行算法是 q—超线性收敛的 . 相似文献
9.
10.
We describe an image reconstruction problem and the computational difficulties arising in determining the maximum a posteriori (MAP) estimate. Two algorithms for tackling the problem, iterated conditional modes (ICM) and simulated annealing, are usually applied pixel by pixel. The performance of this strategy can be poor, particularly for heavily degraded images, and as a potential improvement Jubb and Jennison (1991) suggest the cascade algorithm in which ICM is initially applied to coarser images formed by blocking squares of pixels. In this paper we attempt to resolve certain criticisms of cascade and present a version of the algorithm extended in definition and implementation. As an illustration we apply our new method to a synthetic aperture radar (SAR) image. We also carry out a study of simulated annealing, with and without cascade, applied to a more tractable minimization problem from which we gain insight into the properties of cascade algorithms. 相似文献