全文获取类型
收费全文 | 18352篇 |
免费 | 425篇 |
专业分类
管理学 | 2687篇 |
民族学 | 78篇 |
人才学 | 1篇 |
人口学 | 1854篇 |
丛书文集 | 85篇 |
教育普及 | 1篇 |
理论方法论 | 1513篇 |
现状及发展 | 1篇 |
综合类 | 230篇 |
社会学 | 8347篇 |
统计学 | 3980篇 |
出版年
2023年 | 111篇 |
2020年 | 266篇 |
2019年 | 359篇 |
2018年 | 459篇 |
2017年 | 593篇 |
2016年 | 459篇 |
2015年 | 303篇 |
2014年 | 417篇 |
2013年 | 3135篇 |
2012年 | 605篇 |
2011年 | 541篇 |
2010年 | 425篇 |
2009年 | 403篇 |
2008年 | 416篇 |
2007年 | 436篇 |
2006年 | 388篇 |
2005年 | 403篇 |
2004年 | 364篇 |
2003年 | 341篇 |
2002年 | 380篇 |
2001年 | 454篇 |
2000年 | 448篇 |
1999年 | 414篇 |
1998年 | 294篇 |
1997年 | 284篇 |
1996年 | 278篇 |
1995年 | 260篇 |
1994年 | 229篇 |
1993年 | 240篇 |
1992年 | 299篇 |
1991年 | 252篇 |
1990年 | 264篇 |
1989年 | 279篇 |
1988年 | 239篇 |
1987年 | 219篇 |
1986年 | 231篇 |
1985年 | 264篇 |
1984年 | 268篇 |
1983年 | 269篇 |
1982年 | 211篇 |
1981年 | 187篇 |
1980年 | 181篇 |
1979年 | 225篇 |
1978年 | 170篇 |
1977年 | 161篇 |
1976年 | 150篇 |
1975年 | 139篇 |
1974年 | 130篇 |
1973年 | 123篇 |
1971年 | 96篇 |
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
941.
Comfort is an issue that has gained relevance within the aeronautical industry due to the necessity of manufacturers and airline companies of differentiating themselves in a market that has become more and more competitive each day. This study's aim is to analyze the comfort/discomfort of passengers, based on the analysis of the activities performed in the aircrafts' cabin during real flights, in order to create ergonomics requirements and a methodology of comfort analysis. The study has been performed during domestic commercial flights, and the adopted data collection techniques have been: the application of 219 questionnaires to passengers, 44 registrations of postures and actions through filmings and 12 semistructured interviews. The method has made possible the reconstruction of the user's action course in performing activities in real flight situations, and the calculation of the area occupied by the passenger during his or her actions. The integrated analysis of the results corroborates data from previous studies in which both the space made available to each passenger and the activity performed interfere in their perception of comfort. From this study it has been concluded that the method constitutes itself as an innovative tool within the process of aircrafts' cabins project enabling the calculation of the action space based on the reconstructed course. 相似文献
942.
The ability of older adults to use a domestic appliance depends on their comprehension of the appliance's operation. This may depend on transfer of understanding from similar, more familiar technology. While this may assist their interaction with the new device, it may constrain the discovery of new functionality not represented in the familiar technology, and, thereby, constrain the discovery of advanced functionality. Older adults experience declining cognitive abilities associated with attention, perceptual encoding, and memory (cueing and recall). Designing appliances to extend cognitive abilities provides opportunity to prolong functional independence. Concepts from cognitive psychology, human factors, and gerontology are reviewed to explain age-related behavior towards technology to support innovative product development of technologies for older adults. 相似文献
943.
We describe a Bayesian approach to evaluating children's abuse disclosures and review research demonstrating that children's disclosure of genital touch can be highly probative of sexual abuse, with the probative value depending on disclosure spontaneity and children's age. We discuss how some commentators understate the probative value of children's disclosures by: confusing the probability of abuse given disclosure with the probability of disclosure given abuse, assuming that children formally questioned about sexual abuse have a low prior probability of sexual abuse, misstating the probative value of abuse disclosure, and confusing the distinction between disclosure and nondisclosure with the distinction between true and false disclosures. We review interviewing methods that increase the probative value of disclosures, including interview instructions, narrative practice, noncontingent reinforcement, and questions about perpetrator/caregiver statements and children's reactions to the alleged abuse. 相似文献
944.
Evaluation of a personal safety program with Latino preschoolers 总被引:1,自引:1,他引:0
This study evaluated a personal safety educational program designed for Latino families attending preschools in a large metropolis. Seventy-eight children who participated in the Kids Learning About Safety program were compared to 45 control children. Compared with controls, participating children demonstrated enhanced ability to recognize inappropriate touches, learned correct genital terminology, were able to recognize the inappropriateness of touch requests made by "good" people, demonstrated higher levels of personal safety skills, and learned general safety rules. Gains in knowledge were maintained at three-month follow-up testing for all content areas except genital terminology. Although feedback provided by participating families was positive, recruiting participants and maintaining attendance at sessions was difficult. Discussion includes recommendations for future research and engagement of this population. 相似文献
945.
An adapted version of “the trust game with revenge” is applied to a Swedish setting. Senders – the first-movers – can keep an endowment of SEK 30, or give fractions or all to an unknown receiver. Donations are multiplied by five before reaching receivers, who may, or may not, send back part or the entire received amount. Half of the receivers are given information that the sender has the opportunity to exact revenge, while the remaining are not given this information. Results differ from Fehr and Gächter (2000), in the sense that the share of endowments sent in the first stage is around two thirds, compared to less than one third in Fehr and Gächter. Furthermore, they find a very strong effect of punishment while we find almost no effect. An efficiency frontier is defined and results show that that only 25% of the outcomes reach this frontier due to lack of trust. If senders were confident that receivers would return at least 20% of the donated amount, it is optimal to donate the whole endowment. Only about one-fifth returned of the receivers returned less than this, so for the most part the lack of trust is unwarranted. 相似文献
946.
Alonso Ramírez Augustin Engman Keysa G. Rosas Omar Perez-Reyes Diana M. Martinó-Cardona 《Urban Ecosystems》2012,15(2):315-325
Improving our understanding of the impacts of urbanization on tropical island streams is critical as urbanization becomes a dominant feature in tropical areas. Although the ??urban stream syndrome?? has been successful in summarizing urban impacts on streams, the response of some island streams is different to that expected. Here we review available information on urban impacts to tropical island streams and describe unique responses to urbanization. We identified three key aspects that play particularly important or unique roles in determining tropical-island stream integrity: biotic response to water pollution, movement barriers along the stream network, and altered geomorphology that results in habitat loss. As expected, water pollution negatively impacts stream ecosystems in tropical islands and in some regions impacts can be severe, as untreated wastewaters are directly discharged into streams. While aquatic insects show the expected responses to pollution, other native fauna (e.g., shrimps and fishes) appear to be less impacted by moderate levels of pollution. Movement barriers along the stream network are especially important as much of the tropical island fauna have diadromous (either amphidromous or catadromous) life histories. Most native freshwater mollusks, shrimps, and fishes inhabiting tropical islands are diadromous and depend on unimpeded connections between freshwater and marine environments to complete their life cycles. The presence of these species in urban streams is best explained by longitudinal connectivity rather than by the degree of urban impact. Finally, in streams that remain connected to marine environments, the presence of native shrimps and fishes is strongly related to the physical habitat. Fish assemblages in channelized and severely altered stream reaches are almost completely devoid of native fauna and tend to be dominated by non-native species. In contrast, relatively diverse shrimp and fish assemblages can be found in reaches that retain their physical habitat complexity, even when they are impacted by urbanization. Our understanding of urban impacts on tropical island streams remains limited. However, the identification of key aspects can help us better understand urban impacts on streams in tropical islands, and best focus our management and research efforts to protect these unique ecosystems. 相似文献
947.
948.
LAURENT C. GLIN ARTHUR P. J. MOL PETER OOSTERVEER SIMPLICE D. VODOUHÊ 《全球网;跨国事务杂志》2012,12(3):333-354
In this article, we attempt to conceptualize the historical development and the governance structure of the transnational organic cotton network from Benin. We aim to discover how the organic cotton production‐consumption network is governed locally and internationally. Existing bodies of literature on international agricultural production networks, in particular the Global Value Chains (GVC) perspective, focus on economic dimensions, but find it difficult to incorporate the sustainability dimension. We favour widening the concept of GVCs beyond economics by acknowledging and including environmental rationalities and the representatives of their interests, not as external elements, but rather as co‐governing or co‐structuring factors (or actors) of sustainable value chains. Our findings reveal that beyond the traditional producer versus buyer dualism, intermediate stakeholders, namely transnational and local environmental NGO networks, are instrumental in the construction, maintenance and transformation of the organic cotton network. It is also apparent that farmers' leaders play an important role in mediating and (re)building trust among organic farmers, though they exert insufficient vertical power in the organic cotton network to control it. 相似文献
949.
This article describes the role that schools are playing in supporting career development for young people. It examines the history of career-related programming in schools, including school-to-work programs, career and technical education, the college and career readiness movement, and current school reform initiatives. This understanding of schools' history, roles, opportunities, and constraints can help practitioners and policymakers think about how to build a system that supports youth development. 相似文献
950.
Kwong K Chung H Cheal K Chou JC Chen T 《Journal of social work in disability & rehabilitation》2012,11(2):81-99
In this study the authors assessed the effects of disability beliefs, conceptualization and labeling of emotional disabilities, and perceived barriers on help-seeking behaviors among depressed Chinese Americans in a primary care setting. Forty-two Chinese Americans participated in semistructured interviews using established psychological measures and open-ended questions adapted from the Explanatory Model Interview Catalogue. The authors found that care utilization appears to be complicated by somatization of emotional problems, variations in causal attribution to depression, barriers to receiving mental health care, and the burden of comorbid physical conditions. Their findings highlight the importance of addressing these issues and educating patients about body-mind dialectic common to depression. 相似文献