全文获取类型
收费全文 | 9686篇 |
免费 | 447篇 |
国内免费 | 164篇 |
专业分类
管理学 | 470篇 |
劳动科学 | 2篇 |
民族学 | 79篇 |
人才学 | 1篇 |
人口学 | 278篇 |
丛书文集 | 602篇 |
理论方法论 | 344篇 |
综合类 | 4068篇 |
社会学 | 876篇 |
统计学 | 3577篇 |
出版年
2024年 | 29篇 |
2023年 | 133篇 |
2022年 | 164篇 |
2021年 | 187篇 |
2020年 | 266篇 |
2019年 | 338篇 |
2018年 | 392篇 |
2017年 | 472篇 |
2016年 | 360篇 |
2015年 | 331篇 |
2014年 | 589篇 |
2013年 | 1355篇 |
2012年 | 700篇 |
2011年 | 655篇 |
2010年 | 499篇 |
2009年 | 468篇 |
2008年 | 432篇 |
2007年 | 473篇 |
2006年 | 419篇 |
2005年 | 429篇 |
2004年 | 341篇 |
2003年 | 265篇 |
2002年 | 201篇 |
2001年 | 195篇 |
2000年 | 144篇 |
1999年 | 90篇 |
1998年 | 95篇 |
1997年 | 66篇 |
1996年 | 31篇 |
1995年 | 39篇 |
1994年 | 26篇 |
1993年 | 17篇 |
1992年 | 22篇 |
1991年 | 14篇 |
1990年 | 14篇 |
1989年 | 6篇 |
1988年 | 8篇 |
1987年 | 7篇 |
1986年 | 6篇 |
1985年 | 6篇 |
1984年 | 6篇 |
1983年 | 5篇 |
1981年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 546 毫秒
51.
裴秀娟 《河北理工大学学报(社会科学版)》2003,3(Z1):121-122
研究了基础釉的成分、蓄光粉的加入量、釉层厚度和烧成温度制度等因素对蓄光陶瓷发光性能的影响以及各种制品最佳工艺技术路线的确定. 相似文献
52.
The development of a Municipal Information System, or currently better known as a local spatial data infrastructure, is considered complex due to the required inter-institutional relationships. In many developing countries Geographical Information Systems (GISs) are introduced but the benefits are modest as no changes take place in technical and organisational structure of organisations. Digital databases and computer-aided design (CAD) maps are mushrooming in great variety within different private and public institutions, municipal organisations and even within single departments and with structures similar to the paper period and thus operating on a stand-alone basis.Many national mapping agencies are not able to provide large-scale digital urban base maps, while the absence or low quality of cadastres makes those basic core data sets unavailable or inaccessible. The result is that duplication and incompatible data are frequently observed and also donor-driven stand-alone projects have a limited impact through the lack of institutional embedding and are not able to mature from the project to the institutional level. However, a positive sign is that there is an increasing awareness among data producers and consumers that investments in the development of digital data sets should be combined to reduce costs and increase benefits from especially GIS, and information and communication technology (ICT) in general.Within Trujillo a long-term vision was developed to make full use of ICT and GIS to modernise all operations of the Municipality to increase the efficiency and effectiveness of its tasks. However, large investments are not feasible due to the very limited municipal budgets. To guarantee the support of the municipal council, short-term results are required. This paper describes three ‘products’ as part of the vision to develop through a step-by-step approach a local spatial data infrastructure for Trujillo.The three, rather different, products are:
- 1. fiscal cadastre, to increase municipal revenues through property taxation;
- 2. an ‘environmental atlas’ based on a compatible spatial and attribute data sets from a variety of organisations; and
- 3. a municipal website with interactive GIS and meta data information.
53.
Paul Zhang 《Journal of applied statistics》2005,32(2):141-155
A controlled clinical trial was conducted to investigate the efficacy effect of a chemical compound in the treatment of Premenstrual Dysphoric Disorder (PMDD). The data from the trial showed a non-monotone pattern of missing data and an ante-dependence covariance structure. A new analytical method for imputing the missing data with the ante-dependence covariance is proposed. The PMDD data are analysed by the non-imputation method and two imputation methods: the proposed method and the MCMC method. 相似文献
54.
利用《沂蒙生活报》的发行范围、2 0 0 1年 7月临沂城区的长话业务量、2 0 0 1年临沂城日发送客运班次和临沂城区批发市场的销售范围等资料 ,通过对人流、资本流、信息流等因素的分析 ,将临沂经济影响区划分为核心区、直接腹地、间接腹地和过渡地带 相似文献
55.
Chandan Saha Michael P. Jones 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2005,67(1):167-182
Summary. In longitudinal studies, missingness of data is often an unavoidable problem. Estimators from the linear mixed effects model assume that missing data are missing at random. However, estimators are biased when this assumption is not met. In the paper, theoretical results for the asymptotic bias are established under non-ignorable drop-out, drop-in and other missing data patterns. The asymptotic bias is large when the drop-out subjects have only one or no observation, especially for slope-related parameters of the linear mixed effects model. In the drop-in case, intercept-related parameter estimators show substantial asymptotic bias when subjects enter late in the study. Eight other missing data patterns are considered and these produce asymptotic biases of a variety of magnitudes. 相似文献
56.
西部高校怎样更好实现计算机与物理实验的整合 总被引:2,自引:0,他引:2
王晓璐 《贵州民族学院学报》2005,(3):159-160
随着计算机的飞速发展,学校里出现了越来越多的多媒体教室;CAI计算机辅助教学、虚拟实验教学等各种软件更是蓬勃发展起来;很多教育工作者提出物理实验中计算机仿真教学、物理实验中应用计算机辅助教学等各种措施.作为西部高校,我们应该根据自身资金有限、学生基础比较薄弱等特点,更好的实现计算机与物理实验的整合. 相似文献
57.
Wing-Kam Fung Zhong-Yi Zhu Bo-Cheng Wei Xuming He 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2002,64(3):565-579
Summary. Semiparametric mixed models are useful in biometric and econometric applications, especially for longitudinal data. Maximum penalized likelihood estimators (MPLEs) have been shown to work well by Zhang and co-workers for both linear coefficients and nonparametric functions. This paper considers the role of influence diagnostics in the MPLE by extending the case deletion and subject deletion analysis of linear models to accommodate the inclusion of a nonparametric component. We focus on influence measures for the fixed effects and provide formulae that are analogous to those for simpler models and readily computable with the MPLE algorithm. We also establish an equivalence between the case or subject deletion model and a mean shift outlier model from which we derive tests for outliers. The influence diagnostics proposed are illustrated through a longitudinal hormone study on progesterone and a simulated example. 相似文献
58.
数据挖掘与数据仓库在CRM中的应用 总被引:2,自引:0,他引:2
徐丽娟 《绍兴文理学院学报》2002,22(10):46-48
介绍了客户关系管理的思想、功能组成 ,以及数据挖掘和数据仓库技术在客户关系管理中的应用 相似文献
59.
沃敏亚 《绍兴文理学院学报》2002,22(3):64-66
城市商业银行在加入WTO后的五年过渡期中 ,应练好内功 ,提升自身的核心竞争力来应对外资银行的挑战。 相似文献
60.
文化建设是都市建设的重要内容 ,渝中区是重庆的都市中心 ,在重庆市和渝中区的社会经济发展规划中 ,应当把文化建设放在重要的战略地位。本文重点讨论文化建设在都市建设中的意义和基本要求 ,并提出一些发展都市文化的建议 相似文献