全文获取类型
收费全文 | 7299篇 |
免费 | 384篇 |
出版年
2020年 | 122篇 |
2019年 | 175篇 |
2018年 | 233篇 |
2017年 | 211篇 |
2016年 | 274篇 |
2015年 | 181篇 |
2014年 | 166篇 |
2013年 | 1963篇 |
2012年 | 220篇 |
2011年 | 249篇 |
2010年 | 235篇 |
2009年 | 224篇 |
2008年 | 191篇 |
2007年 | 201篇 |
2006年 | 169篇 |
2005年 | 108篇 |
2004年 | 97篇 |
2003年 | 99篇 |
2002年 | 112篇 |
2001年 | 145篇 |
2000年 | 105篇 |
1999年 | 114篇 |
1998年 | 89篇 |
1997年 | 81篇 |
1996年 | 84篇 |
1995年 | 70篇 |
1994年 | 60篇 |
1993年 | 72篇 |
1992年 | 73篇 |
1991年 | 61篇 |
1990年 | 61篇 |
1989年 | 56篇 |
1988年 | 53篇 |
1987年 | 61篇 |
1986年 | 61篇 |
1985年 | 69篇 |
1984年 | 79篇 |
1983年 | 84篇 |
1982年 | 69篇 |
1981年 | 68篇 |
1980年 | 67篇 |
1979年 | 62篇 |
1978年 | 68篇 |
1977年 | 67篇 |
1976年 | 61篇 |
1975年 | 71篇 |
1974年 | 44篇 |
1973年 | 38篇 |
1972年 | 41篇 |
1971年 | 39篇 |
排序方式: 共有7683条查询结果,搜索用时 15 毫秒
961.
962.
963.
964.
965.
966.
Sven Oliver Müller 《European Review of History》2010,17(6):835-859
The aim of this article is to establish the extent to which the history of music can offer new perspectives on the modern period. We need a change of perspective, moving away from the aesthetic debates on music to an investigation of actual experiences and practices of participants. Audience behaviour provides a link between musical production and society. In order to make opera houses and concert halls visible as social spheres, this article draws on examples from the musical life of Berlin and London in the 1800s. Music should no longer be regarded as a peripheral phenomenon, but instead as a potential historical question. The analysis of musical performances prompts at least one: music matters. 相似文献
967.
968.
M. G. Blöcher G. Zimmermann I. Moeck W. Brandt A. Hassanzadegan F. Magri 《Geofluids》2010,10(3):406-421
Understanding hydrothermal processes during production is critical to optimal geothermal reservoir management and sustainable utilization. This study addresses the hydrothermal (HT) processes in a geothermal research doublet consisting of the injection well E GrSk3/90 and production well Gt GrSk4/05 at the deep geothermal reservoir of Groß Schönebeck (north of Berlin, Germany) during geothermal power production. The reservoir is located between ?4050 to ?4250 m depth in the Lower Permian of the Northeast German Basin. Operational activities such as hydraulic stimulation, production (T = 150°C; Q = ?75 m3 h?1; C = 265 g l?1) and injection (T = 70°C; Q = 75 m3 h?1; C = 265 g l?1) change the HT conditions of the geothermal reservoir. The most significant changes affect temperature, mass concentration and pore pressure. These changes influence fluid density and viscosity as well as rock properties such as porosity, permeability, thermal conductivity and heat capacity. In addition, the geometry and hydraulic properties of hydraulically induced fractures vary during the lifetime of the reservoir. A three‐dimensional reservoir model was developed based on a structural geological model to simulate and understand the complex interaction of such processes. This model includes a full HT coupling of various petrophysical parameters. Specifically, temperature‐dependent thermal conductivity and heat capacity as well as the pressure‐, temperature‐ and mass concentration‐dependent fluid density and viscosity are considered. These parameters were determined by laboratory and field experiments. The effective pressure dependence of matrix permeability is less than 2.3% at our reservoir conditions and therefore can be neglected. The results of a three‐dimensional thermohaline finite‐element simulation of the life cycle performance of this geothermal well doublet indicate the beginning of thermal breakthrough after 3.6 years of utilization. This result is crucial for optimizing reservoir management. Geofluids (2010) 10 , 406–421 相似文献
969.
970.