全文获取类型
收费全文 | 91346篇 |
免费 | 2808篇 |
国内免费 | 3篇 |
专业分类
管理学 | 12370篇 |
民族学 | 560篇 |
人才学 | 25篇 |
人口学 | 7168篇 |
丛书文集 | 533篇 |
教育普及 | 2篇 |
理论方法论 | 9431篇 |
现状及发展 | 1篇 |
综合类 | 2176篇 |
社会学 | 42985篇 |
统计学 | 18906篇 |
出版年
2023年 | 503篇 |
2021年 | 566篇 |
2020年 | 1509篇 |
2019年 | 2208篇 |
2018年 | 2119篇 |
2017年 | 3174篇 |
2016年 | 2391篇 |
2015年 | 2040篇 |
2014年 | 2631篇 |
2013年 | 18839篇 |
2012年 | 2475篇 |
2011年 | 2245篇 |
2010年 | 2009篇 |
2009年 | 2214篇 |
2008年 | 2112篇 |
2007年 | 1921篇 |
2006年 | 2129篇 |
2005年 | 2322篇 |
2004年 | 2211篇 |
2003年 | 1922篇 |
2002年 | 2016篇 |
2001年 | 2038篇 |
2000年 | 1804篇 |
1999年 | 1705篇 |
1998年 | 1512篇 |
1997年 | 1363篇 |
1996年 | 1314篇 |
1995年 | 1337篇 |
1994年 | 1322篇 |
1993年 | 1293篇 |
1992年 | 1304篇 |
1991年 | 1230篇 |
1990年 | 1203篇 |
1989年 | 1038篇 |
1988年 | 1127篇 |
1987年 | 1006篇 |
1986年 | 911篇 |
1985年 | 1082篇 |
1984年 | 1135篇 |
1983年 | 1018篇 |
1982年 | 944篇 |
1981年 | 865篇 |
1980年 | 823篇 |
1979年 | 874篇 |
1978年 | 775篇 |
1977年 | 711篇 |
1976年 | 658篇 |
1975年 | 640篇 |
1974年 | 516篇 |
1973年 | 440篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
181.
Albert A. Bartlett 《Population and environment》1993,14(4):359-387
This is a tutorial on the relations between population data and the rates of growth that are calculated from the data. For the calculation of rates of growth, discrete and continuous compounding will be compared so that the reader can see the reasons for using the mathematics of continuous compounding, which is the mathematics of exponential growth. Some properties of exponential growth are developed. Semi-logarithmic graphs will be discussed as a device for representing the size of growing populations and for analyzing the nature of the growth. Illustrative examples will be worked out in order to emphasize applications and utility. 相似文献
182.
对林业税费的经济学分析 总被引:3,自引:0,他引:3
田明华 《北京林业大学学报(社会科学版)》2002,(Z1)
该文运用经济学的基本工具———供给和需求曲线 ,以商品林为研究对象 ,探讨了林业税费的作用机理和内涵。该文认为商品林生产具有正的外部性 ,市场失灵使生产者将不能提供社会真正所需要的商品林数量。在封闭的市场条件下 ,林业税费会直接成为价格的一部分 ,商品林生产者应当能够获得正常利润 ,与税费高低无关 ,但会使一部分林地退出生产。林业补贴是一种负的林业税收。在开放市场经济条件下 ,国内商品林供应量低于没有林业税收时的商品林供应量 ,更低于考虑社会生态需求时的商品林供应量 ,造成巨大的社会福利损失 ,应减免林业税费、增加林业扶持、取消价格管制。该文进一步研究了与林业税费密切相关的森林采伐限额政策 ,认为对商品林应该完全取消采伐限额政策 相似文献
183.
教学管理是教学工作运转的支柱,教学管理的优劣影响着教学质量。该文介绍了外语学院教学管理工作的基本内容,包括教学任务的布置落实、教学检查、教学文件的建设、学籍管理,以及结合学院的实际情况完善考试制度、制定成绩管理细则和考试结果奖励办法等。 相似文献
184.
Multiparameter evidence synthesis in epidemiology and medical decision-making: current approaches 总被引:1,自引:0,他引:1
A. E. Ades A. J. Sutton 《Journal of the Royal Statistical Society. Series A, (Statistics in Society)》2006,169(1):5-35
Summary. Alongside the development of meta-analysis as a tool for summarizing research literature, there is renewed interest in broader forms of quantitative synthesis that are aimed at combining evidence from different study designs or evidence on multiple parameters. These have been proposed under various headings: the confidence profile method, cross-design synthesis, hierarchical models and generalized evidence synthesis. Models that are used in health technology assessment are also referred to as representing a synthesis of evidence in a mathematical structure. Here we review alternative approaches to statistical evidence synthesis, and their implications for epidemiology and medical decision-making. The methods include hierarchical models, models informed by evidence on different functions of several parameters and models incorporating both of these features. The need to check for consistency of evidence when using these powerful methods is emphasized. We develop a rationale for evidence synthesis that is based on Bayesian decision modelling and expected value of information theory, which stresses not only the need for a lack of bias in estimates of treatment effects but also a lack of bias in assessments of uncertainty. The increasing reliance of governmental bodies like the UK National Institute for Clinical Excellence on complex evidence synthesis in decision modelling is discussed. 相似文献
185.
思维方式对语言的结构有哪些影响?本文从形合与意合在句法上与章法上的不同表现,论述了英汉两种语言在结构和表达方式上的不同,并通过实例归纳出一些具体做法,供同行进一步探讨。 相似文献
186.
Ruth V. Aguilera 《英国管理杂志》2005,16(Z1):S39-S53
This paper examines the role of boards of directors in light of institutional contingencies and recent best practice governance guidelines and regulation such as the United Kingdom Higgs Review and the United States Sarbanes‐Oxley Act 2002. Particular attention is paid to discussing the role of independent directors across countries, and the implications for corporate governance innovation. It concludes by posing questions about recent corporate governance transformations and providing suggestions for future research. 相似文献
187.
188.
This paper describes the design optimization of a robot sensor used for locating 3-D objects employing the Taguchi method in a computer simulation scenario. The location information from the sensor is to be utilized to control the movements of an industrial robot in a 'pick-and-place' or assembly operation. The Taguchi method, which is based on the Analysis-of-Variance (ANOVA) approach, is utilized to improve the performance of the sensor over a wider operating range. A review of the Taguchi method is presented along with step-by-step implementation details to identify and optimize the design parameters of the sensor. The method allows us to gauge the impact of various interactions present in the sensor system exclusively and permits us to single out those factors that have a dominant influence on the overall performance of the sensor. The investigation suggests that the Taguchi method is a more structured and efficient approach for achieving a robust design compared with the classical full factorial design approach. 相似文献
189.
Patrick D. Bourke 《Journal of applied statistics》2002,29(8):1121-1133
A Continuous Sampling Plan, CSP-CUSUM, is proposed based on the use of Cumulative Sums (CUSUMs) for deciding when to switch between the phases of sampling inspection and 100% inspection. The Geometric CUSUM, also termed the Run-length CUSUM, is chosen for this purpose, and two separate CUSUMs are to be operated, one for each inspection phase. The conventional measures of performance for CSPs such as average outgoing quality, average fraction inspected, and average proportion passed under sampling inspection are evaluated for CSP-CUSUM, and comparisons with some standard CSPs are presented. An additional performance-measure, Average Cycle Length, is proposed. A table is provided to aid the choice of parameters for the operation of CSP-CUSUM. It is recommended that a Geometric CUSUM control chart be maintained in parallel with CSP-CUSUM to detect significant upward shifts in the incoming fraction defective. 相似文献
190.
高校加强大学生心理健康教育问题探索 总被引:2,自引:0,他引:2
本文针对近期大学生中出现的一系列心理问题,结合教学实际,就如何加强大学生心理健康教育进行了探讨,提出开设心理健康课、成立心理咨询中心等建议。 相似文献