全文获取类型
收费全文 | 283篇 |
免费 | 14篇 |
出版年
2023年 | 7篇 |
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 4篇 |
2019年 | 14篇 |
2018年 | 12篇 |
2017年 | 19篇 |
2016年 | 14篇 |
2015年 | 16篇 |
2014年 | 14篇 |
2013年 | 42篇 |
2012年 | 12篇 |
2011年 | 11篇 |
2010年 | 15篇 |
2009年 | 12篇 |
2008年 | 9篇 |
2007年 | 9篇 |
2006年 | 10篇 |
2005年 | 6篇 |
2004年 | 4篇 |
2003年 | 7篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 4篇 |
1996年 | 3篇 |
1995年 | 2篇 |
1994年 | 6篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1969年 | 2篇 |
排序方式: 共有297条查询结果,搜索用时 15 毫秒
101.
Christian Baumann 《Journal of the history of the neurosciences》2013,22(3):291-292
Abstract Dopamine is among the most well‐researched neurotransmitters at the present time. For the first half‐century of neurotransmitter research, however, interest in dopamine was minimal, and only a few scattered groups of researchers studied it. It was their research that stimulated current interest, and provided the background for our present understanding of this important substance. By the late 1950s, it was clear to these individuals that dopamine served an important physiological role in mammalian brains, and that its role was most likely that of a central nervous system agonist. Soon after this, dopamine, or more specifically the depletion of dopamine, was clearly implicated in Parkinson's disease. This paper looks at the early history of the physiological roles of this intriguing compound. 相似文献
102.
Cornets are cone-shaped ceramic vessels, characteristic of the Chalcolithic period (ca. 4700–3700 BC) in Israel and Jordan. Their contents and use are unknown. Gas chromatography with flame ionization and mass-selective detection, showed that extracts of cornets from five different sites with different related activities (domestic, habitation cave and a cultic complex) all contain the same assemblage of mainly n-alkanes adsorbed within their walls. This assemblage differs from those found in other types of ceramic vessels from the same sites, as well as from the residues found within the associated sediments. The assemblage of odd and even-numbered n-alkanes found in the cornets is almost identical to that found in the residues of beeswax heated on modern ceramic fragments, as well as in a beehive from the Iron Age IIA strata at Tel Rehov, Israel. Thus the cornets are most likely to have contained beeswax. The presence of beeswax in the cornets contributes to our understanding of the Chalcolithic period; a time when secondary products such as milk, olive oil and wine are thought to have come into use. 相似文献
103.
The 2006 “Thematic Strategy on the Urban Environment” is the first piece of official European Union (EU) policy solely focused on the urban environment. It follows a process of several years in which the EU has tried to promote an integrated approach to urban management. During the 2005–2007 “Liveable Cities” project, reflection was given to the “Thematic Strategy”. This resulted in important critiques on the EU's approach to the urban environment. Explaining how the initial top-down approach chosen by the EU contributed to the perceived “failure” of the “Thematic Strategy”, suggestions are made for alternative approaches to the creation of liveable cities in Europe. 相似文献
104.
105.
106.
Christian Lund 《Development and change》2009,40(1):131-148
In the course of political struggle in northern Ghana, the classification of land and resources has shifted between the two ‘master categories’ of public and private. Despite the fact that master categories may be wholly inadequate in accounting for the actual complexity of property objects, social units and rights, they are not divorced from the agency of people who have something at stake. Laws, rules and by‐laws are referred to as important markers and fashion the local political struggles over the rights to and control over resources. This article offers a general account of conflicts and the recategorization of resources in the property system of small‐scale irrigation. It examines the logics and positioning of the different stakeholders, and discusses how different levels of public policy have provided opportunities for such changes. A case study presents the opportunity to examine the details of a particular controversy demonstrating the social and political powers involved in the recategorization of property. 相似文献
107.
108.
109.
Christian Berndt 《对极》2003,35(2):264-285
Starting from the assumption that maquiladora managers play a crucial role in the current struggle for the discursive construction of the "modern" Mexico, this paper critically engages with these powerful actors and their representations of maquiladora workers and the production environment. Adopting a critical perspective on traditional notions of modernity and modernization, I start my argument from the assumption that the idea of linear progress and its use as a universal blueprint to hierarchically order the social world has not disappeared. Though the idea of progress and development is, at first glance, a simple and straightforward message, it is actually full of paradoxes. Using case-study material from El Paso del Norte, the international agglomeration on the Mexican-US border combining Ciudad Ju´rez and El Paso, I argue that both the image of maquiladoras as developed and the image of them as backward are indispensable to the modernization discourse within the maquiladora industry. I seek to show that maquiladora managers play a powerful role in transmitting the modernization narrative and that in doing so they are getting caught within its contradictions. By producing and reproducing discourses of Ciudad Ju´rez and its inhabitants as backward, while simultaneously attempting to prove that there is progress and development, managers recreate some of the very problems they attempt to overcome. 相似文献
110.