全文获取类型
收费全文 | 19034篇 |
免费 | 761篇 |
国内免费 | 172篇 |
专业分类
管理学 | 1386篇 |
劳动科学 | 3篇 |
民族学 | 180篇 |
人才学 | 3篇 |
人口学 | 251篇 |
丛书文集 | 1245篇 |
理论方法论 | 941篇 |
综合类 | 9465篇 |
社会学 | 1993篇 |
统计学 | 4500篇 |
出版年
2024年 | 20篇 |
2023年 | 112篇 |
2022年 | 119篇 |
2021年 | 175篇 |
2020年 | 337篇 |
2019年 | 364篇 |
2018年 | 517篇 |
2017年 | 649篇 |
2016年 | 515篇 |
2015年 | 507篇 |
2014年 | 791篇 |
2013年 | 2762篇 |
2012年 | 1260篇 |
2011年 | 1106篇 |
2010年 | 987篇 |
2009年 | 1074篇 |
2008年 | 930篇 |
2007年 | 1062篇 |
2006年 | 1043篇 |
2005年 | 976篇 |
2004年 | 887篇 |
2003年 | 789篇 |
2002年 | 699篇 |
2001年 | 587篇 |
2000年 | 406篇 |
1999年 | 219篇 |
1998年 | 131篇 |
1997年 | 137篇 |
1996年 | 124篇 |
1995年 | 109篇 |
1994年 | 72篇 |
1993年 | 70篇 |
1992年 | 53篇 |
1991年 | 52篇 |
1990年 | 32篇 |
1989年 | 34篇 |
1988年 | 42篇 |
1987年 | 25篇 |
1986年 | 14篇 |
1985年 | 35篇 |
1984年 | 32篇 |
1983年 | 30篇 |
1982年 | 20篇 |
1981年 | 16篇 |
1980年 | 12篇 |
1979年 | 14篇 |
1978年 | 7篇 |
1977年 | 6篇 |
1976年 | 3篇 |
1975年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 921 毫秒
71.
There is an emerging consensus in empirical finance that realized volatility series typically display long range dependence with a memory parameter (d) around 0.4 (Andersen et al., 2001; Martens et al., 2004). The present article provides some illustrative analysis of how long memory may arise from the accumulative process underlying realized volatility. The article also uses results in Lieberman and Phillips (2004, 2005) to refine statistical inference about d by higher order theory. Standard asymptotic theory has an O(n-1/2) error rate for error rejection probabilities, and the theory used here refines the approximation to an error rate of o(n-1/2). The new formula is independent of unknown parameters, is simple to calculate and user-friendly. The method is applied to test whether the reported long memory parameter estimates of Andersen et al. (2001) and Martens et al. (2004) differ significantly from the lower boundary (d = 0.5) of nonstationary long memory, and generally confirms earlier findings. 相似文献
72.
Yosihiko Ogata Koichi Katsura Masaharu Tanemura 《Journal of the Royal Statistical Society. Series C, Applied statistics》2003,52(4):499-509
Summary. Earthquake intensities are modelled as a function of previous activity whose specific form is based on established empirical laws in seismology, but whose parameter values can vary from place to place. This model is used for characterizing regional features of seismic activities in and around Japan, and also for exploring regions where the actual seismicity rate systematically deviates from that of the modelled rate. 相似文献
73.
针对串联型稳压器,设计了一种应用于串联型稳压器具有自建基准的新型误差放大电路。该电路具有构思巧妙,结构优化,易于集成及较高的开环增益,共模抑制比及交流特性的优点。通过验证,实测数据与仿真结果基本一致。 相似文献
74.
Chunming M. Zhang 《Revue canadienne de statistique》2003,31(2):151-171
Many applications of nonparametric tests based on curve estimation involve selecting a smoothing parameter. The author proposes an adaptive test that combines several generalized likelihood ratio tests in order to get power performance nearly equal to whichever of the component tests is best. She derives the asymptotic joint distribution of the component tests and that of the proposed test under the null hypothesis. She also develops a simple method of selecting the smoothing parameters for the proposed test and presents two approximate methods for obtaining its P‐value. Finally, she evaluates the proposed test through simulations and illustrates its application to a set of real data. 相似文献
75.
杨曼英 《湖南人文科技学院学报》2004,(2):78-79
通过定义、定理、正反对比的例题论述了函数列收敛、一致收敛、内闭一致收敛及其之间的关系与差异。 相似文献
76.
Peter Hall Qiwei Yao 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2003,65(2):425-442
Summary. We develop a general methodology for tilting time series data. Attention is focused on a large class of regression problems, where errors are expressed through autoregressive processes. The class has a range of important applications and in the context of our work may be used to illustrate the application of tilting methods to interval estimation in regression, robust statistical inference and estimation subject to constraints. The method can be viewed as 'empirical likelihood with nuisance parameters'. 相似文献
77.
屈颖 《西安石油大学学报(社会科学版)》2003,12(2):43-46
阐述了我国财务公司的性质和特点;指出并分析了当前我国财务公司存在的业务定位不准,融资渠道狭窄,缺乏人才资源和行政干预过多等主要问题;提出了明确财务公司的定位,拓展金融服务功能,拓宽融资渠道,开发人才资源,制定长远发展战略,提高竞争力和抗风险能力等解决问题的对策。 相似文献
78.
艺术的本质在于其精神性,从艺术和时代精神的相互关系中去确立划分艺术形态的标准是符合艺术本质的.按照艺术所包含的精神内容的不同,艺术形态可分为神性艺术、人性艺术和理性艺术,以丰富的艺术史例可以说明其特征. 相似文献
79.
Diagnostics for dependence within time series extremes 总被引:1,自引:0,他引:1
Anthony W. Ledford Jonathan A. Tawn 《Journal of the Royal Statistical Society. Series B, Statistical methodology》2003,65(2):521-543
Summary. The analysis of extreme values within a stationary time series entails various assumptions concerning its long- and short-range dependence. We present a range of new diagnostic tools for assessing whether these assumptions are appropriate and for identifying structure within extreme events. These tools are based on tail characteristics of joint survivor functions but can be implemented by using existing estimation methods for extremes of univariate independent and identically distributed variables. Our diagnostic aids are illustrated through theoretical examples, simulation studies and by application to rainfall and exchange rate data. On the basis of these diagnostics we can explain characteristics that are found in the observed extreme events of these series and also gain insight into the properties of events that are more extreme than those observed. 相似文献
80.
郑陶凌 《河北理工大学学报(社会科学版)》2003,3(3):135-137
从把握时机,掌握力度等方面提出遵循以学生为主体原则,符合学生认知过程的需要,同时保证语文教学按自身学科性质完成教学目标,在有利于学生形象思维发展的前提下,把握运用信息技术的最佳时机达到教学最佳效果. 相似文献