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71.
对镇域经济一般有两种理解:一种是将镇域经济看作行政区域经济.另一种是将镇域经济看作开放式的区域经济。本文对镇域经济的研究侧重于乡镇行政区域内的经济,立足于以镇区经济为核心.通过发挥镇域比较优势和资源优势,培育新型经济增长点.从而辐射带动整个区县经济的发展。镇域经济上联城市经济、下联农村经济.具有促进区域经济增长和社会全面进步的综合功能。 相似文献
72.
在《自然辩证法》中,恩格斯从自在自然和属人自然两个维度对自然的内核进行了科学和哲学双重解读。从自在自然看,自然具有自组织性、先在性和系统性、有机性,是惯常行程的自我生成,具有存在论意义。因而生态伦理学应该走出对人的"固恋","扩大道德共同体的边界",把自然纳入伦理的怀抱。从属人自然看,自然是人本学的自然与社会的自然的耦合,是对象性活动中的人化生成,具有对象性意义。劳动的对象性决定了人对自然的依赖性,决定了保全自然的逻辑必然性。如此,恩格斯对自然的本质规定性的理解,既超越了非人类中心主义的"无文明的生态",又超越了人类中心主义的"无生态的文明";它为生态伦理学的成立提供了充分的"自然本体论证明"。 相似文献
73.
Xiaoyan Lei Yan Shen James P. Smith Guangsu Zhou 《Review of Economics of the Household》2018,16(1):75-95
This research uses nationally representative data to study how economic resources and inequalities are associated with life satisfaction of Chinese residents. We construct economic resource and inequality measures from expenditure rather than from income, after confirming that expenditure inequality is a better measure in the Chinese context. We find that economic inequalities in general are negatively associated with life satisfaction, and that this association is larger for inequalities in the lower half of the distribution than those in the upper half of the distribution. We further explore the mechanisms under which inequality can be associated with life satisfaction, and find that aspiration is potentially one important channel. 相似文献
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76.
For ethical reasons, group sequential trials were introduced to allow trials to stop early in the event of extreme results. Endpoints in such trials are usually mortality or irreversible morbidity. For a given endpoint, the norm is to use a single test statistic and to use that same statistic for each analysis. This approach is risky because the test statistic has to be specified before the study is unblinded, and there is loss in power if the assumptions that ensure optimality for each analysis are not met. To minimize the risk of moderate to substantial loss in power due to a suboptimal choice of a statistic, a robust method was developed for nonsequential trials. The concept is analogous to diversification of financial investments to minimize risk. The method is based on combining P values from multiple test statistics for formal inference while controlling the type I error rate at its designated value.This article evaluates the performance of 2 P value combining methods for group sequential trials. The emphasis is on time to event trials although results from less complex trials are also included. The gain or loss in power with the combination method relative to a single statistic is asymmetric in its favor. Depending on the power of each individual test, the combination method can give more power than any single test or give power that is closer to the test with the most power. The versatility of the method is that it can combine P values from different test statistics for analysis at different times. The robustness of results suggests that inference from group sequential trials can be strengthened with the use of combined tests. 相似文献
77.
Statistical inference for the diffusion coefficients of multivariate diffusion processes has been well established in recent years; however, it is not the case for the drift coefficients. Furthermore, most existing estimation methods for the drift coefficients are proposed under the assumption that the diffusion matrix is positive definite and time homogeneous. In this article, we put forward two estimation approaches for estimating the drift coefficients of the multivariate diffusion models with the time inhomogeneously positive semidefinite diffusion matrix. They are maximum likelihood estimation methods based on both the martingale representation theorem and conditional characteristic functions and the generalized method of moments based on conditional characteristic functions, respectively. Consistency and asymptotic normality of the generalized method of moments estimation are also proved in this article. Simulation results demonstrate that these methods work well. 相似文献
78.
文章利用2011年2月至2015年9月阿里巴巴研究院公布的网络零售价格(ASPI)指数及其各分类商品价格指数与国家统计局公布的CPI历史数据分别作为线上、线下一般商品价格变动的代理变量,在协整检验的基础上采用向量误差修正模型对线上、线下商品价格变动的关联关系进行了定量分析,并对构成ASPI的各分项商品价格指数与CPI之间的关系进行了分析.研究表明:在误差修正机制的作用下,线上、线下商品价格之间存在稳定均衡的关系. 相似文献
79.
"高铁经济"的发展对区域经济与社会发展具有重要的带动作用与战略意义,高铁枢纽及其周边地区也将成为城市发展新引擎。对其功能定位与产业发展则是高铁枢纽地区开发建设的前提与成功与否的关键因素之一。以广州南站枢纽地区为例,以区域竞合发展的视角,剖析南站地区发展面临的阶段困境,探索基于新一轮国家对外开放战略与地区合作升级机遇的背景下,南站地区如何利用高铁枢纽和区位优势,对接不同层面的战略需求来清晰定位其功能,并对产业发展路径与空间布局提出相应的合理化建议。 相似文献
80.
The varying coefficient (VC) model introduced by Hastie and Tibshirani [26] is arguably one of the most remarkable recent developments in nonparametric regression theory. The VC model is an extension of the ordinary regression model where the coefficients are allowed to vary as smooth functions of an effect modifier possibly different from the regressors. The VC model reduces the modelling bias with its unique structure while also avoiding the ‘curse of dimensionality’ problem. While the VC model has been applied widely in a variety of disciplines, its application in economics has been minimal. The central goal of this paper is to apply VC modelling to the estimation of a hedonic house price function using data from Hong Kong, one of the world's most buoyant real estate markets. We demonstrate the advantages of the VC approach over traditional parametric and semi-parametric regressions in the face of a large number of regressors. We further combine VC modelling with quantile regression to examine the heterogeneity of the marginal effects of attributes across the distribution of housing prices. 相似文献