全文获取类型
收费全文 | 8470篇 |
免费 | 175篇 |
国内免费 | 46篇 |
专业分类
管理学 | 357篇 |
民族学 | 32篇 |
人口学 | 169篇 |
丛书文集 | 361篇 |
理论方法论 | 162篇 |
综合类 | 2545篇 |
社会学 | 138篇 |
统计学 | 4927篇 |
出版年
2024年 | 5篇 |
2023年 | 41篇 |
2022年 | 71篇 |
2021年 | 72篇 |
2020年 | 130篇 |
2019年 | 232篇 |
2018年 | 255篇 |
2017年 | 493篇 |
2016年 | 173篇 |
2015年 | 209篇 |
2014年 | 306篇 |
2013年 | 2181篇 |
2012年 | 628篇 |
2011年 | 373篇 |
2010年 | 285篇 |
2009年 | 302篇 |
2008年 | 334篇 |
2007年 | 340篇 |
2006年 | 295篇 |
2005年 | 305篇 |
2004年 | 249篇 |
2003年 | 244篇 |
2002年 | 208篇 |
2001年 | 211篇 |
2000年 | 156篇 |
1999年 | 92篇 |
1998年 | 71篇 |
1997年 | 50篇 |
1996年 | 54篇 |
1995年 | 38篇 |
1994年 | 28篇 |
1993年 | 33篇 |
1992年 | 27篇 |
1991年 | 27篇 |
1990年 | 27篇 |
1989年 | 23篇 |
1988年 | 17篇 |
1987年 | 16篇 |
1986年 | 10篇 |
1985年 | 12篇 |
1984年 | 13篇 |
1983年 | 15篇 |
1982年 | 7篇 |
1981年 | 4篇 |
1980年 | 4篇 |
1979年 | 7篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1976年 | 3篇 |
1975年 | 4篇 |
排序方式: 共有8691条查询结果,搜索用时 21 毫秒
31.
宋喜坤 《白城师范学院学报》2006,(1)
欲望化写作是当今文坛上方兴未艾的且引人注目的文学现象,其注重张扬感官放纵和感官感受。本文拟从欲望化写作的成因、分类以及欲望化写作的积极影响和消极影响等几个方面来探讨欲望化思潮。 相似文献
32.
Generalized additive models for location, scale and shape 总被引:10,自引:0,他引:10
R. A. Rigby D. M. Stasinopoulos 《Journal of the Royal Statistical Society. Series C, Applied statistics》2005,54(3):507-554
Summary. A general class of statistical models for a univariate response variable is presented which we call the generalized additive model for location, scale and shape (GAMLSS). The model assumes independent observations of the response variable y given the parameters, the explanatory variables and the values of the random effects. The distribution for the response variable in the GAMLSS can be selected from a very general family of distributions including highly skew or kurtotic continuous and discrete distributions. The systematic part of the model is expanded to allow modelling not only of the mean (or location) but also of the other parameters of the distribution of y , as parametric and/or additive nonparametric (smooth) functions of explanatory variables and/or random-effects terms. Maximum (penalized) likelihood estimation is used to fit the (non)parametric models. A Newton–Raphson or Fisher scoring algorithm is used to maximize the (penalized) likelihood. The additive terms in the model are fitted by using a backfitting algorithm. Censored data are easily incorporated into the framework. Five data sets from different fields of application are analysed to emphasize the generality of the GAMLSS class of models. 相似文献
33.
Point processes are the stochastic models most suitable for describing physical phenomena that appear at irregularly spaced
times, such as the earthquakes. These processes are uniquely characterized by their conditional intensity, that is, by the
probability that an event will occur in the infinitesimal interval (t, t+Δt), given the history of the process up tot. The seismic phenomenon displays different behaviours on different time and size scales; in particular, the occurrence of
destructive shocks over some centuries in a seismogenic region may be explained by the elastic rebound theory. This theory
has inspired the so-called stress release models: their conditional intensity translates the idea that an earthquake produces
a sudden decrease in the amount of strain accumulated gradually over time along a fault, and the subsequent event occurs when
the stress exceeds the strength of the medium. This study has a double objective: the formulation of these models in the Bayesian
framework, and the assignment to each event of a mark, that is its magnitude, modelled through a distribution that depends
at timet on the stress level accumulated up to that instant. The resulting parameter space is constrained and dependent on the data,
complicating Bayesian computation and analysis. We have resorted to Monte Carlo methods to solve these problems. 相似文献
34.
Stuart Barber Guy P. Nason 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2004,66(4):927-939
Summary. Wavelet shrinkage is an effective nonparametric regression technique, especially when the underlying curve has irregular features such as spikes or discontinuities. The basic idea is simple: take the discrete wavelet transform of data consisting of a signal corrupted by noise; shrink or remove the wavelet coefficients to remove the noise; then invert the discrete wavelet transform to form an estimate of the true underlying curve. Various researchers have proposed increasingly sophisticated methods of doing this by using real-valued wavelets. Complex-valued wavelets exist but are rarely used. We propose two new complex-valued wavelet shrinkage techniques: one based on multiwavelet style shrinkage and the other using Bayesian methods. Extensive simulations show that our methods almost always give significantly more accurate estimates than methods based on real-valued wavelets. Further, our multiwavelet style shrinkage method is both simpler and dramatically faster than its competitors. To understand the excellent performance of this method we present a new risk bound on its hard thresholded coefficients. 相似文献
35.
国有企业的特殊性与我国国有企业的布局定位 总被引:1,自引:0,他引:1
国有企业特殊性的真实内涵表现为,它有着特殊的所有者和所有者代表、特殊的社会目标、特殊的社会经济功能和特殊的产权组织运作机制。因此,越是在以社会目标为主的产业领域,国有企业就越有存在的价值。尽管国有企业的布局是一种趋向性和开放式的动态布局,但它所传递的信息表明国有企业会在特殊产业领域中以合适的方式继续存在并扮演重要角色。 相似文献
36.
Testing symmetry under a skew Laplace model 总被引:3,自引:0,他引:3
Tomasz J. Kozubowski Anna K. Panorska 《Journal of statistical planning and inference》2004,120(1-2):41-63
We develop tests of hypothesis about symmetry based on samples from possibly asymmetric Laplace distributions and present exact and limiting distribution of the test statistics. We postulate that the test statistic derived under the Laplace model is a rational choice as a measure of skewness and can be used in testing symmetry for other, quite general classes of skew distributions. Our results are applied to foreign exchange rates for 15 currencies. 相似文献
37.
谢胜利 《长江大学学报(社会科学版)》1992,(2)
本文对种群密度在非均匀分布情形下,考虑了具反馈控制的滞后 Logistic 生态模型平衡位置的稳定性;分别给出了在常时滞和弱连续时滞以及强连续时滞情况下的稳定性条件;其结果是对 Gopalsamy 在密度均匀分布情形下相应结果的推广. 相似文献
38.
本文总结了高能核—核碰撞的多源模型自1987年提出到1990年以来的主要进展,着重介绍多源模型的基本物理思想及其在两种不同方案下的发展动态.通过与最新实验数据比较,说明多源模型能够成功地解释高能重离子碰撞的整体性质. 相似文献
39.
教育对经济增长的抑制效应是教育对经济增长双重效应的一个重要方面。本文从确认教育对经济增长的抑制效应的存在出发,分析了教育对经济增长抑制效应的具体情形,探讨了教育对经济增长抑制效应的存在机制。 相似文献
40.
李燕华 《郑州轻工业学院学报(社会科学版)》2002,3(3):20-23
在社会主义市场经济条件下坚持按劳分配的主体地位,既是社会主义生产过程本身的客观要求,也是社会主义市场经济健康发展的现实要求。同时,由于多种所有制及多元产权主体的存在,作为市场机制在分配领域发挥作用的具体表现,按生产要素分配在社会主义市场经济条件下也具有必然性。实践中,必须在全面认识二者对立统一关系的基础上,从微观经济领域的运行层次和所有制结构层次以及宏现经济运行层次实现按劳分配与按生产要素分配的有机结合。 相似文献