首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   9851篇
  免费   602篇
  国内免费   122篇
管理学   2847篇
劳动科学   1篇
民族学   25篇
人口学   111篇
丛书文集   490篇
理论方法论   435篇
综合类   5448篇
社会学   504篇
统计学   714篇
  2024年   43篇
  2023年   178篇
  2022年   154篇
  2021年   167篇
  2020年   313篇
  2019年   289篇
  2018年   287篇
  2017年   327篇
  2016年   339篇
  2015年   366篇
  2014年   573篇
  2013年   776篇
  2012年   623篇
  2011年   644篇
  2010年   532篇
  2009年   506篇
  2008年   533篇
  2007年   546篇
  2006年   562篇
  2005年   524篇
  2004年   455篇
  2003年   407篇
  2002年   332篇
  2001年   290篇
  2000年   142篇
  1999年   103篇
  1998年   58篇
  1997年   51篇
  1996年   41篇
  1995年   40篇
  1994年   56篇
  1993年   39篇
  1992年   33篇
  1991年   30篇
  1990年   36篇
  1989年   22篇
  1988年   33篇
  1987年   22篇
  1986年   19篇
  1985年   13篇
  1984年   18篇
  1983年   17篇
  1982年   17篇
  1981年   16篇
  1980年   1篇
  1979年   1篇
  1977年   1篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
本文分析了建设项目中专业技术服务的潜在风险,探讨了风险管理的内容、途径和方法,简述了专业责任保险的特点和原则,指出了在我国开展专业责任保险的紧迫性。  相似文献   
102.
本文认为,风险投资机构在设立之初及再融资过程中面临着融资风险,而拓宽融资渠道是降低这类风险的关键。本文首先介绍了风险投资机构的融资来源有哪些,以及影响风险投资机构融资的各种因素。在此基础上,笔者提出了目前扩大我国风险投资机构融资来源、控制转移融资风险的各种措施。  相似文献   
103.
作为混业经营的尝试,商业银行设立基金管理公司,在提升金融效益的同时,伴随而来的是巨大的金融风险。风险主要来自两方面:跨市场经营和分业监管体系.进一步完善资本市场,建立严密的业务隔离机制和联合监管新体制,将是我们防范和化解此类风险的必然选择。  相似文献   
104.
This report summarizes the proceedings of a conference on quantitative methods for assessing the risks of developmental toxicants. The conference was planned by a subcommittee of the National Research Council's Committee on Risk Assessment Methodology 4 in conjunction with staff from several federal agencies, including the U.S. Environmental Protection Agency, U.S. Food and Drug Administration, U.S. Consumer Products Safety Commission, and Health and Welfare Canada. Issues discussed at the workshop included computerized techniques for hazard identification, use of human and animal data for defining risks in a clinical setting, relationships between end points in developmental toxicity testing, reference dose calculations for developmental toxicology, analysis of quantitative dose-response data, mechanisms of developmental toxicity, physiologically based pharmacokinetic models, and structure-activity relationships. Although a formal consensus was not sought, many participants favored the evolution of quantitative techniques for developmental toxicology risk assessment, including the replacement of lowest observed adverse effect levels (LOAELs) and no observed adverse effect levels (NOAELs) with the benchmark dose methodology.  相似文献   
105.
本文给出了在有错检验情况下标准型抽样方案的设计方法,讨论了误检概率p,p′对抽样方案的影响,并给出抽样方案的实际应用。  相似文献   
106.
Intuitive Toxicology: Expert and Lay Judgments of Chemical Risks   总被引:2,自引:0,他引:2  
Human beings have always been intuitive toxicologists, relying on their senses of sight, taste, and smell to detect harmful or unsafe food, water, and air. As we have come to recognize that our senses are not adequate to assess the dangers inherent in exposure to a chemical substance, we have created the sciences of toxicology and risk assessment to perform this function. Yet despite this great effort to overcome the limitations of intuitive toxicology, it has become evident that even our best scientific methods still depend heavily on extrapolations and judgments in order to infer human health risks from animal data. Many observers have acknowledged the inherent subjectivity in the assessment of chemical risks and have indicated a need to examine the subjective or intuitive elements of expert and lay risk judgments. We have begun such an examination by surveying members of the Society of Toxicology and the lay public about basic toxicological concepts, assumptions, and interpretations. Our results demonstrate large differences between toxicologists and laypeople, as well as differences between toxicologists working in industry, academia, and government. In addition, we find that toxicologists are sharply divided in their opinions about the ability to predict a chemical's effect on human health on the basis of animal studies. We argue that these results place the problems of risk communication in a new light. Although the survey identifies misconceptions that experts should clarify for the public, it also suggests that controversies over chemical risks may be fueled as much by limitations of the science of risk assessment and disagreements among experts as by public misconceptions.  相似文献   
107.
With the increasing pressure on social and health care resources,professionals have to be more explicit in their decision makingregarding the long-term care of older people. This groundedtheory study used 19 focus groups and nine semi-structured interviews(99 staff in total) to explore professional perspectives onthis decision making. Focus group participants and intervieweescomprised care managers, social workers, consultant geriatricians,general medical practitioners, community nurses, home care managers,occupational therapists and hospital discharge support staff.The emerging themes spanned context, clients, families and services.Decisions were often prompted by a crisis, hindering professionalsseeking to make a measured assessment. Fear of burglary andassault, and the willingness and availability of family to helpwere major factors in decisions about living at home. Serviceavailability in terms of public funding for community care,the availability of home care workers and workload pressureson primary care services influenced decision ‘thresholds’regarding admission to institutional care. Assessment toolsdesigned to assist decision making about the long-term careof older people need to take into account the critical aspectsof individual fears and motivation, family support and the availabilityof publicly funded services as well as functional and medicalneeds.  相似文献   
108.
国家财政对农业的投入是影响农业发展的重要因素。收集了建国以来国家财政对农业投入的数据,分析构造出状态空间模型,应用卡尔曼滤波估计出状态向量,挖掘出隐藏在数据内部的变化特征,分析国家财政对农业投入的实际情况,并对未来几年的农业投入进行预测。  相似文献   
109.
经济增长理论是社会经济发展的一种理论反映,源于斯密和李嘉图为代表的古典经济学派,是二战后在发达国家广泛流行的经济理论。但是,发达国家经济学家自身存在的认识论缺陷使其不可能建立科学完整的经济增长理论及模型,因此还必须遵循马克思的方法论从理论为实际的反映入手建立科学模型,并以此指导中国社会经济增长实践,特别是农村经济增长方式的转变实践。  相似文献   
110.
农村地区建立循环经济模式的研究   总被引:3,自引:0,他引:3  
随着全球化的不断深入,改变我国传统农业经营模式已显得非常紧迫。通过对农业循环经济的背景、概念、特征和制约因素等的分析,得出农村地区发展农业循环经济模式非常必要的结论,并指出了具体的解决途径。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号