全文获取类型
收费全文 | 19217篇 |
免费 | 975篇 |
国内免费 | 168篇 |
专业分类
管理学 | 898篇 |
劳动科学 | 1篇 |
民族学 | 216篇 |
人才学 | 8篇 |
人口学 | 244篇 |
丛书文集 | 2225篇 |
理论方法论 | 869篇 |
综合类 | 14295篇 |
社会学 | 803篇 |
统计学 | 801篇 |
出版年
2024年 | 21篇 |
2023年 | 99篇 |
2022年 | 400篇 |
2021年 | 181篇 |
2020年 | 190篇 |
2019年 | 228篇 |
2018年 | 267篇 |
2017年 | 278篇 |
2016年 | 415篇 |
2015年 | 491篇 |
2014年 | 1232篇 |
2013年 | 1168篇 |
2012年 | 1508篇 |
2011年 | 1585篇 |
2010年 | 1241篇 |
2009年 | 1266篇 |
2008年 | 1297篇 |
2007年 | 1461篇 |
2006年 | 1369篇 |
2005年 | 1249篇 |
2004年 | 1038篇 |
2003年 | 1074篇 |
2002年 | 776篇 |
2001年 | 654篇 |
2000年 | 346篇 |
1999年 | 110篇 |
1998年 | 60篇 |
1997年 | 47篇 |
1996年 | 52篇 |
1995年 | 40篇 |
1994年 | 19篇 |
1993年 | 28篇 |
1992年 | 21篇 |
1991年 | 12篇 |
1990年 | 10篇 |
1989年 | 6篇 |
1988年 | 10篇 |
1987年 | 7篇 |
1986年 | 1篇 |
1985年 | 10篇 |
1984年 | 20篇 |
1983年 | 20篇 |
1982年 | 18篇 |
1981年 | 15篇 |
1980年 | 7篇 |
1979年 | 9篇 |
1978年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
1.
本文基于第一、二次对"无锡、保定农村调查"的资料,分析说明了无锡农村经营式农业的日渐式微,并从出租农地与雇工经营的收益方程、较高工商业发展水平导致的机会成本增加,以及家庭小农场的竞争三个方面分析了经营式农业不发展的原因.我们认为,主要是当地较高但又不足够高的工商业发展水平导致了经营式农业难以发展.较高的工商业发展水平意味着发展经营式农业的高运营成本和高机会成本.不足够高又使得非农产业的需求与人数众多的农业过剩劳动力不相匹配,从而造成了家庭小农场和经营式农场之间的激烈对抗.我们也认为,中国未来的农业农村现代化道路可能会依然呈现出复杂性和特殊性,家庭小农场扮演的角色可能仍然不容忽视. 相似文献
2.
This article solves an operational performance measurement problem of a global logistics firm through an internal benchmarking tool. The intended impact is to enable logistics firms to form a deeper understanding of their own internal processes and metrics. The methodology of this in-depth action research involves a sequential approach with a series of interviews, questionnaire-based surveys, operations data collated through observations and process mapping yielding real-world data. A series of statistical tests are conducted to analyse the collated data. Strategic priorities of the firm are integrated with the firm’s operational performance to ascertain the effective performance by considering both the tangible and intangible measures. The outcomes inform both practitioners and academics how the firm could improve its freight forwarding business’s profitability by ensuring that its operations meet the prioritised criteria. The ‘best practice’ derived from internal benchmarking forms an intermediate step towards external benchmarking. The outcomes facilitate investigating the current business strategy, the standard operating procedures and the scope of improving those. 相似文献
3.
迄今,为解决多属性偏好关联决策属性集容量判断指数复杂性难题所提出的λ模糊测度模式与k-可加模糊测度模式,以及建构在它们之上的属性集容量确定的推算模型,尚存在着适用性差的技术不足。为此,以平衡容量判断的可操作性和容量推算的准确性为视角,提出了一种新容量测度模式,即关于容量判断与推算的夹挤式测度模式,并在此基础上通过引入决策者较易判断给出的容量序信息构建了相应的容量推算模型。基于数值模拟的对比分析表明:新模式不仅在应用可行性上高于k-可加模糊测度模式,而且从容量推算的准确性上看也明显优于λ模糊测度模式和k-可加模糊测度模式,因而对实际决策具有更强的适用性。 相似文献
4.
胡星铭 《浙江大学学报(人文社会科学版)》2018,48(3):173
当代知识论越来越重视认知价值的研究,但从认知价值角度去重新思考传统怀疑主义问题的研究却很少。历史上的怀疑主义者既认为我们无法拥有任何知识,又主张我们应该悬置判断。因此,他们不仅预设了一个高的知识标准,而且预设了一个价值标准:任何达不到知识标准的认知状态都是没有认知价值的。但这个价值标准是错误的,所以我们即使无法达到怀疑主义者所设定的知识标准,也不必悬置判断。假设怀疑主义者认为我们无法拥有任何知识,同时认可“有些达不到知识标准的认知状态也有认知价值”,那么怀疑主义就没有很大的威胁性,因为即使我们无法获取知识,也可以获得具有认知价值的东西,取得认知进步。此外,摩尔主义、语境主义、溯因主义这几种对怀疑主义的主要回应是否成功,最终都依赖于对认知价值的讨论。 相似文献
5.
《Risk analysis》2018,38(9):1962-1971
Given the recent increase in dust‐induced lung disease among U.S. coal miners and the respiratory hazards encountered across the U.S. mining industry, it is important to enhance an understanding of lung disease trends and the organizational contexts that precede these events. In addition to exploring overall trends reported to the Mine Safety and Health Administration (MSHA), the current study uses MSHA's enforcement database to examine whether or not compliance with health regulations resulted in fewer mine‐level counts of these diseases over time. The findings suggest that interstitial lung diseases were more prevalent in coal mines compared to other mining commodities, in Appalachian coal mines compared to the rest of the United States, and in underground compared to surface coal mines. Mines that followed a relevant subset of MSHA's health regulations were less likely to report a lung disease over time. The findings are discussed from a lung disease prevention strategy perspective. 相似文献
6.
Isabel Baño-Piñero María Emilia Martínez-Roche Manuel Canteras-Jordana César Carrillo-García Esteban Orenes-Piñero 《Women and birth : journal of the Australian College of Midwives》2018,31(4):e239-e244
Background
The rates of breastfeeding worldwide are slowly improving since 1996. Europe is still trailing behind the global breastfeeding incidence and prevalence rates. Thus, breastfeeding promotion, protection, prolongation and support have become an important challenge as breastfeeding sharply decreases in the first six months of life.Objectives
The aim of this project is to determine, assess and identify the real impact of breastfeeding support networks in Murcia (Spain).Methods
After searching unsuccessfully for a validated questionnaire, a specific one was developed and validated for measuring the impact of formal and informal support networks through five dimensions: satisfaction, consultation, experience, problems and support. The questionnaire was provided to 500 mothers with experience in breastfeeding, who brought their children to baby paediatricians between 2 June and 27 November 2014. Upon completion of the survey and fieldwork, a detailed statistical analysis was conducted.Results
The degree of satisfaction perceived by the users of the services of support breastfeeding networks is remarkable. In addition, mothers who clarified their doubts and discussed their problems with health professionals and/or breastfeeding support networks were more likely to breastfeed for a longer duration compared to those who did not (p = 0.005). Furthermore, mothers who sought support in breastfeeding are more likely to breastfeed for more than 6 months (p < 0.0005).Conclusion
Based on this information, we conclude that breastfeeding support networks have a positive influence in the duration of a women’s decision to breastfeed. 相似文献7.
王钰 《河北工程大学学报(社会科学版)》2018,35(1):24-27
文章通过发放调查问卷,归纳、整理“十二五”期间的财务会计报表对河北省中等职业教育财政投入状况进行了分析,揭示了存在的主要问题,提出了改进中等职业教育财政投入机制的对策和建议。 相似文献
8.
This paper examines the implications for European music culture of the European Union’s (EU) Digital Single Market strategy. It focuses on the regulatory framework being created for the management of copyright policy, and in particular the role played by collective management organisations (CMOs or collecting societies). One of the many new opportunities created by digitalisation has been the music streaming services. These depend on consumers being able to access music wherever they are, but such a system runs counter to the management of rights on a national basis and through collecting organisations which act as monopolies within their own territories. The result has been ‘geo-blocking’. The EU has attempted to resolve this problem in a variety of ways, most recently in a Directive designed to reform the CMOs. In this paper, we document these various efforts, showing them to be motivated by a deep-seated and persisting belief in the capacity of ‘competition’ to resolve problems that, we argue, actually lie elsewhere – in copyright policy itself. The result is that the EU’s intervention fails to address its core concern and threatens the diversity of European music culture by rewarding those who are already commercially successful. 相似文献
9.
This paper discusses regression analysis of clustered current status data under semiparametric additive hazards models. In particular, we consider the situation when cluster sizes can be informative about correlated failure times from the same cluster. To address the problem, we present estimating equation-based estimation procedures and establish asymptotic properties of the resulting estimates. Finite sample performance of the proposed method is assessed through an extensive simulation study, which indicates the procedure works well. The method is applied to a motivating data set from a lung tumorigenicity study. 相似文献
10.
Rachel H. Farr Ilyssa Salomon Jazmin L. Brown-Iannuzzi Christia Spears Brown 《Journal of GLBT Family Studies》2019,15(2):127-150
As numbers of families with same-sex parents increase in the United States, children are more likely to encounter diverse family structures. Given that young children can demonstrate in-group bias, prejudicial attitudes, and social exclusion, it is important to understand how children perceive their peers in diverse families. To our knowledge, no studies have assessed elementary-school-age children's attitudes about same-sex parent families. Here, 131 elementary school students (Mage = 7.79 years; 61 girls) viewed images of same-sex (female and male) and other-sex couples with a child and then were asked about their perceptions of these families, particularly the children. Results indicated participants' preferences toward children with other-sex versus same-sex parents. Developmental and practical implications about children's attitudes toward sexual minority parent families are discussed. 相似文献