全文获取类型
收费全文 | 4796篇 |
免费 | 210篇 |
出版年
2020年 | 71篇 |
2019年 | 107篇 |
2018年 | 156篇 |
2017年 | 172篇 |
2016年 | 163篇 |
2015年 | 126篇 |
2014年 | 122篇 |
2013年 | 1447篇 |
2012年 | 118篇 |
2011年 | 149篇 |
2010年 | 112篇 |
2009年 | 113篇 |
2008年 | 105篇 |
2007年 | 103篇 |
2006年 | 85篇 |
2005年 | 63篇 |
2004年 | 65篇 |
2003年 | 58篇 |
2002年 | 71篇 |
2001年 | 69篇 |
2000年 | 80篇 |
1999年 | 64篇 |
1998年 | 55篇 |
1997年 | 56篇 |
1996年 | 52篇 |
1995年 | 48篇 |
1994年 | 32篇 |
1993年 | 32篇 |
1992年 | 31篇 |
1991年 | 37篇 |
1990年 | 29篇 |
1989年 | 44篇 |
1988年 | 31篇 |
1987年 | 35篇 |
1986年 | 41篇 |
1985年 | 53篇 |
1984年 | 49篇 |
1983年 | 55篇 |
1982年 | 45篇 |
1981年 | 50篇 |
1980年 | 52篇 |
1979年 | 51篇 |
1978年 | 49篇 |
1977年 | 38篇 |
1976年 | 46篇 |
1975年 | 36篇 |
1974年 | 26篇 |
1973年 | 34篇 |
1971年 | 26篇 |
1969年 | 26篇 |
排序方式: 共有5006条查询结果,搜索用时 93 毫秒
101.
102.
103.
Abstract. German society is on its way to changing from a relatively homogenous population as a result of the Second World War and prior events to a more culturally, ethnically and religiously diverse society, based on its huge post-war immigration. The emergence of racism, political extremism and violence in post-unification German society points to deficits of political legitimacy, political culture and social cohesion. The strains of unification and waves of immigration from East Germany, ethnic German resettlers (Aussiedler), and asylum seekers have exacerbated and made visible unsolved questions of national identity, diversity, immigration and integration of foreigners. These events have affected German political culture and polarised the traditional party system along a ‘New’ and ‘Old Politics’ axis. These new realities have led to a growth of far right parties, racist violence, and an increase of neo-nationalist, anti-immigrant and welfare-chauvinist rhetoric. 相似文献
104.
There is increasing concern about environmental impacts of acidic drainage from acid sulphate soils on Holocene estuarine flood plains. Acidity derives from oxidation of iron pyrite in the sediments. Natural factors determine concentrations and distributions of pyrite accumulations, but human activities have reduced pyrite accumulation in the Pearl River Delta with land use practices increasing terrestrial sediment discharge. Large freshwater discharges and management techniques have enabled sustainable use of these soils. High concentrations of pyrite occur in many estuarine flood plains of Australia because of relatively greater marine inputs. Drainage of these soils enhances pyrite oxidation and estuarine acidification, which is associated with fish-kills. For sustainable development, the problems of acid sulphate soil drainage must be recognised and overcome. 相似文献
105.
Acid sulphate soils form when iron pyrite oxidises to sulphuric acid on atmospheric exposure, lowering soil pH below 4. In the Richmond River estuary, northern New South Wales, flood mitigation, drainage works and floodplain excavations have augmented acid sulphate soil formation by increasing pyrite availability for oxidation. These engineering works have facilitated the transport of acidified water and have impeded recovery from tributary acidification. The increased frequency and duration of acidification are associated with elevated concentrations of inorganic monomeric aluminium and dissolved iron, and major iron hydroxide precipitation, with deleterious effects on exposed aquatic biota and habitat. Fish kills and an outbreak of epizootic ulcerative syndrome (EUS) have been recorded from acidified sites in the estuary. 相似文献
106.
107.
108.
Michael Kelly 《History and theory》1998,37(4):30-43
Arthur C. Danto has long defended essentialism in the philosophy of art, yet he has been interpreted by many as a historicist. This essentialism/historicism conflict in the interpretation of his work reflects the same conflict both within his thought and, more importantly, within modern art itself. Danto's strategy for resolving this conflict involves, among other things, a Bildungsroman of modern art failing to discover its essence, an essentialist definition of art provided by philosophy which is indemnified against history, and a thesis about the end of art once it has been defined. Is this strategy successful, or does it result, as I argue, in a philosophical disenfranchisement of art of precisely the type that Danto himself has criticized? 相似文献
109.
Bénédicte Zimmermann 《European Review of History》1998,5(1):9-23
Concepts of unemployment or of the labour market are not abstract, but develop from each society's own particular logic. Taking the examples of Germany and France at the end of the nineteenth century, it is possible to see how these concepts were constructed in specific national contexts, and how they were then used in practice. This analysis leads us to rethink current ideas about work and unemployment, and to ask what their future will be in a united Europe. 相似文献
110.