全文获取类型
收费全文 | 17818篇 |
免费 | 572篇 |
国内免费 | 236篇 |
专业分类
管理学 | 1568篇 |
劳动科学 | 2篇 |
民族学 | 163篇 |
人才学 | 1篇 |
人口学 | 416篇 |
丛书文集 | 1251篇 |
理论方法论 | 628篇 |
综合类 | 10373篇 |
社会学 | 1448篇 |
统计学 | 2776篇 |
出版年
2024年 | 29篇 |
2023年 | 164篇 |
2022年 | 164篇 |
2021年 | 213篇 |
2020年 | 343篇 |
2019年 | 399篇 |
2018年 | 460篇 |
2017年 | 537篇 |
2016年 | 489篇 |
2015年 | 588篇 |
2014年 | 991篇 |
2013年 | 1805篇 |
2012年 | 1230篇 |
2011年 | 1271篇 |
2010年 | 1036篇 |
2009年 | 946篇 |
2008年 | 1060篇 |
2007年 | 1179篇 |
2006年 | 1079篇 |
2005年 | 938篇 |
2004年 | 821篇 |
2003年 | 668篇 |
2002年 | 562篇 |
2001年 | 433篇 |
2000年 | 311篇 |
1999年 | 164篇 |
1998年 | 95篇 |
1997年 | 99篇 |
1996年 | 90篇 |
1995年 | 71篇 |
1994年 | 64篇 |
1993年 | 59篇 |
1992年 | 47篇 |
1991年 | 25篇 |
1990年 | 29篇 |
1989年 | 33篇 |
1988年 | 27篇 |
1987年 | 24篇 |
1986年 | 23篇 |
1985年 | 14篇 |
1984年 | 15篇 |
1983年 | 8篇 |
1982年 | 7篇 |
1981年 | 9篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
近年来 ,中国城市建筑火灾发生率呈上升趋势 ,仅 1999年 ,全国共发生建筑火灾 18万起 ,比前一年增长 4 1% ;死亡 2 70 0多人 ,比前一年增长 15 % ,直接经济损失多达 14亿元。 相似文献
102.
贵州省主导产业选择的投入产出分析 总被引:1,自引:0,他引:1
叶文春 《贵州民族学院学报》2008,(1):138-142
正确地选择主导产业对一个地区的经济发展有着至关重要的作用。本文以贵州省投入产出表为依据,运用投入产出分析方法,对地区主导产业的选择进行探讨,为贵州省产业结构调整和区域经济发展规划提供经济学意义的理论参考。 相似文献
103.
通过对环境生态成本的分析,根据上海市2002年的投入产出表,建立了基于资源一经济一环境绿色投入产出表的绿色GDP核算方法。利用这一方法对2010年上海世博会对上海经济一环境影响进行分析研究,结果反映了上海世博会对上海的综合影响。 相似文献
104.
To ascertain the viability of a project, undertake resource allocation, take part in bidding processes, and other related decisions, modern project management requires forecasting techniques for cost, duration, and performance of a project, not only under normal circumstances, but also under external events that might abruptly change the status quo. We provide a Bayesian framework that provides a global forecast of a project's performance. We aim at predicting the probabilities and impacts of a set of potential scenarios caused by combinations of disruptive events, and using this information to deal with project management issues. To introduce the methodology, we focus on a project's cost, but the ideas equally apply to project duration or performance forecasting. We illustrate our approach with an example based on a real case study involving estimation of the uncertainty in project cost while bidding for a contract. 相似文献
105.
李满清 《湖南人文科技学院学报》2004,(Z1)
青少年心理健康教育不容忽视。由于学习压力大,人际交往空间逼仄,存在着严重的心理问题,耐挫能力差。为此,必须通过学校、家庭、社会和学生自我教育四条途径同时进行。 相似文献
106.
Consider a website and the surfers visiting its pages. A typical issue of interest, for example while monitoring an advertising campaign, concerns whether a specific page has been designed successfully, i.e. is able to attract surfers or address them to other pages within the site. We assume that the surfing behaviour is fully described by the transition probabilities from one page to another, so that a clickstream (sequence of consecutively visited pages) can be viewed as a finite-state-space Markov chain. We then implement a variety of hierarchical prior distributions on the multivariate logits of the transition probabilities and define, for each page, a content effect and a link effect. The former measures the attractiveness of the page due to its contents, while the latter signals its ability to suggest further interesting links within the site. Moreover, we define an additional effect, representing overall page success, which incorporates both effects previously described. Using WinBUGS, we provide estimates and credible intervals for each of the above effects and rank pages accordingly. 相似文献
107.
对理论联系实际学风发展的历史回顾及现实思考 总被引:1,自引:0,他引:1
王曙龙 《延安大学学报(社会科学版)》2007,29(1):72-74
理论联系实际是我们党的优良学风,是马列主义、毛泽东思想、邓小平理论和“三个代表”重要思想一贯坚持的原则。我们党的理论联系实际的优良学风是在党的光辉历程中,在正反两方面经验教训的基础上逐渐形成并发扬光大。大力弘扬理论联系实际的马克思主义优良学风,既是现阶段社会发展的需要,也是党的建设工作客观实际的要求,具有非常重要的实践意义。 相似文献
108.
This article presents a framework for using probabilistic terrorism risk modeling in regulatory analysis. We demonstrate the framework with an example application involving a regulation under consideration, the Western Hemisphere Travel Initiative for the Land Environment, (WHTI‐L). First, we estimate annualized loss from terrorist attacks with the Risk Management Solutions (RMS) Probabilistic Terrorism Model. We then estimate the critical risk reduction, which is the risk‐reducing effectiveness of WHTI‐L needed for its benefit, in terms of reduced terrorism loss in the United States, to exceed its cost. Our analysis indicates that the critical risk reduction depends strongly not only on uncertainties in the terrorism risk level, but also on uncertainty in the cost of regulation and how casualties are monetized. For a terrorism risk level based on the RMS standard risk estimate, the baseline regulatory cost estimate for WHTI‐L, and a range of casualty cost estimates based on the willingness‐to‐pay approach, our estimate for the expected annualized loss from terrorism ranges from $2.7 billion to $5.2 billion. For this range in annualized loss, the critical risk reduction for WHTI‐L ranges from 7% to 13%. Basing results on a lower risk level that results in halving the annualized terrorism loss would double the critical risk reduction (14–26%), and basing the results on a higher risk level that results in a doubling of the annualized terrorism loss would cut the critical risk reduction in half (3.5–6.6%). Ideally, decisions about terrorism security regulations and policies would be informed by true benefit‐cost analyses in which the estimated benefits are compared to costs. Such analyses for terrorism security efforts face substantial impediments stemming from the great uncertainty in the terrorist threat and the very low recurrence interval for large attacks. Several approaches can be used to estimate how a terrorism security program or regulation reduces the distribution of risks it is intended to manage. But, continued research to develop additional tools and data is necessary to support application of these approaches. These include refinement of models and simulations, engagement of subject matter experts, implementation of program evaluation, and estimating the costs of casualties from terrorism events. 相似文献
109.
基于旅西日本游客旅游选择行为的西安旅游市场分析 总被引:1,自引:0,他引:1
根据在全国六大旅游热点城市所做的旅游市场调查的数据结果,对旅西日本游客的旅游选择行为进行了研究,同时进一步有针对性地对西安日本客源市场进行了SWOT分析,在此基础上,对西安旅游业的发展提出了相关对策建议。 相似文献
110.
潜在客户资产测量研究 总被引:1,自引:0,他引:1
客户资产由当前客户资产和潜在客户资产两部分组成,对潜在客户资产测量问题尚未有系统的研究。在客户购买行为建模研究的基础上,提出由客户获取预测分析、客户购买行为分析和客户费用分析组成的潜在客户资产测量方法框架,总结了可用的模型,并用实证案例说明;提出利用当前潜在客户资产分析矩阵分析指导投资和管理决策的方法。 相似文献