全文获取类型
收费全文 | 21094篇 |
免费 | 251篇 |
专业分类
各国政治 | 815篇 |
工人农民 | 759篇 |
世界政治 | 1640篇 |
外交国际关系 | 891篇 |
法律 | 12627篇 |
中国共产党 | 2篇 |
中国政治 | 107篇 |
政治理论 | 4318篇 |
综合类 | 186篇 |
出版年
2020年 | 263篇 |
2019年 | 313篇 |
2018年 | 387篇 |
2017年 | 467篇 |
2016年 | 491篇 |
2015年 | 354篇 |
2014年 | 402篇 |
2013年 | 1906篇 |
2012年 | 495篇 |
2011年 | 538篇 |
2010年 | 421篇 |
2009年 | 469篇 |
2008年 | 551篇 |
2007年 | 548篇 |
2006年 | 533篇 |
2005年 | 485篇 |
2004年 | 489篇 |
2003年 | 511篇 |
2002年 | 462篇 |
2001年 | 829篇 |
2000年 | 732篇 |
1999年 | 604篇 |
1998年 | 324篇 |
1997年 | 291篇 |
1996年 | 244篇 |
1995年 | 253篇 |
1994年 | 288篇 |
1993年 | 273篇 |
1992年 | 412篇 |
1991年 | 440篇 |
1990年 | 407篇 |
1989年 | 402篇 |
1988年 | 388篇 |
1987年 | 412篇 |
1986年 | 425篇 |
1985年 | 433篇 |
1984年 | 356篇 |
1983年 | 385篇 |
1982年 | 285篇 |
1981年 | 271篇 |
1980年 | 197篇 |
1979年 | 277篇 |
1978年 | 202篇 |
1977年 | 173篇 |
1976年 | 151篇 |
1975年 | 161篇 |
1974年 | 194篇 |
1973年 | 142篇 |
1972年 | 139篇 |
1971年 | 124篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
811.
Waste pickers and collectors constitute the bottom layer of waste recycling in the metropolis of Delhi. Pickers collect waste just by picking them up from public places such as garbage dumps and streets, whereas collectors purchase waste from waste producers such as households and shops for sale to higher-level waste traders. Most pickers have incomes below the poverty line set by the Planning Commission of India, whereas the majority of collectors earn marginally higher than the poverty-line income. The poverty of pickers is not transitory, but chronic as they have no connection to enter the community of collectors and higher-level waste traders within which the community mechanism works effectively to reduce risk and transaction costs. Despite their low economic and social status, pickers and collectors are making important contributions to society. It is found that pickers and collectors are adding more value than their own income to waste producers' income and to the saving of the city government's expenditure for disposing waste. Increased public support not only for social services, but also production services and infrastructure can be justified not only for the purposes of reducing poverty but also for furthering their positive contribution to society. 相似文献
812.
This paper examines the determinants of women's knowledge regarding HIV/AIDS using data from a nationally representative survey in India. Although around 45 per cent of sample women had heard about the disease, their knowledge regarding its modes of transmission and prevention is found to be limited. To explore the possibility that there may be a different process that determines awareness as opposed to quality of knowledge regarding HIV/AIDS, a negative binomial hurdle model and a two-stage ordered probit model are estimated. The results show that the effect of several covariates, such as education and mass media, on awareness is different from their effect on quality of knowledge. 相似文献
813.
The modern theory of investment identifies the importance of uncertainty to investment. A number of empirical studies have tested the theory on South African time series, employing political instability measures as proxies for uncertainty. This paper verifies that political instability measures are required in the formulation of the investment function for South Africa. It also establishes that there are distinct institutional factors that influence the uncertainty variable such as property rights and crime levels. We find that rising income and property rights lower political instability, and that rising crime levels are positively related to political instability. The inference is that political instability in South Africa may not represent uncertainty directly, since it is systematically related to a set of determinants. Instead, uncertainty would have to be understood as being related to a broader institutional nexus that in concert may generate uncertainty for investors. The paper highlights the significance of getting institutions right to ensure that uncertainty is kept to a minimum by providing a predictable long-term environment. Stability at a systemic level appears crucial if investment rates are to rise in South Africa and this paper demonstrates that stability in turn is driven by a sound institutional environment that has multiple dimensions. 相似文献
814.
This article uses a dictator game to determine the impact of racial identity and inequality on theft in South Africa. A dictator can take money from a receiver's endowment. The money vulnerable to theft is constant across groups, and there is no threat of punishment. Any differential in the amount taken is due to considerations of the racial identity of the potential victim or to variation in receiver endowments. The results provide weak evidence that theft is impacted by inequality. However, racial identity significantly influences theft decisions. Contrary to expectations, black participants take 15 per cent more from other black participants. 相似文献
815.
Sample survey data show few Bolivian small‐farm households using credit, but most would like to borrow from formal market institutions. A theoretical framework is developed to formulate testable hypotheses to identify factors that inhibit credit use. Major impediments to borrowing are scale of operations, as measured by amount of useable land, and borrower's transactions costs that arise from loan paperwork, use of Indian language, remoteness from market, little education and low degree of market integration. When farmers with these characteristics borrow they tend to use informal market sources because of the lower transactions costs compared to those of formal market lenders. The policy implication is if formal market lenders are to reach more farmers they must lower transactions costs. 相似文献
816.
Olivier J. Walther 《发展研究杂志》2013,49(5):603-620
AbstractThe objective of this paper is to show how a formal approach to networks can make a significant contribution to the study of cross-border trade in West Africa. Building on the formal tools and theories developed by social network analysis, we examine the network organisation of 136 large traders in two border regions between Niger, Nigeria and Benin. In a business environment where transaction costs are extremely high, we find that decentralised networks are well adapted to the various uncertainties induced by long-distance trade. We also find that long-distance trade relies both on the trust and cooperation shared among local traders, and on the distant ties developed with foreign partners from a different origin, religion or culture. Studying the spatial structure of trade networks, we find that in those markets where trade is recent and where most of the traders are not native of the region, national borders are likely to exert a greater influence than in those regions where trade has pre-colonial roots. Combining formal network analysis and ethnographic studies, we argue, can make a significant contribution to the current revival of interest in cross-border trade in the policy field. 相似文献
817.
818.
819.
A recent increase in terrorist actions where the terrorist's death is planned and intentional has raised interest in the psychological functioning, motivation, and reasoning of those who engage in terrorism and those who support it. No consensus exists among Western 1 psychologists regarding terrorists who plan to die in their attack, and no Western psychological perspective has thus far contributed substantively to explaining or predicting it. Although most agree that groups engaging in such actions typically have a wider network of support, the psychology of supporters is also unexplained. This article proposes a developmental psychological model of the conditions that favor focused terrorist actions that have publicly discernible goals ascribed to a political or religious cause. The article describes a common pattern of cognitive complexity among terrorist leaders, using Osama bin Laden as a model, where entrenched cognitive simplicity in one key ideological domain (religious or political) is coupled with behavior reflecting the capacity for far greater complexity in other domains (organizational skills, planning, problem-solving.) This pattern, in specifiable historical and ecological context, makes terrorist tactics, including those in which the attacker intentionally dies, more likely, and increases the challenges associated with attempts at diplomacy or negotiated peace. 相似文献
820.
Peter J. S. Duncan 《欧亚研究》2013,65(1):1-25
In the period before the 2007–2008 elections, there was much talk from the regime about the danger of a ‘coloured revolution’ in Russia. The article considers whether the fear of revolution was genuine or artificially created to discredit opposition and strengthen support for the regime. It seems that tensions inside the regime and the unexpected occurrence of the previous coloured revolutions led to real fears of revolution in Russia, although this was in fact unlikely. Russian policy towards the West and the rival election programmes are examined to investigate whether the regime was creating an ‘enemy image’ of the West. 相似文献