全文获取类型
收费全文 | 688篇 |
免费 | 8篇 |
专业分类
化学 | 367篇 |
晶体学 | 4篇 |
力学 | 24篇 |
数学 | 55篇 |
物理学 | 246篇 |
出版年
2022年 | 6篇 |
2021年 | 9篇 |
2019年 | 7篇 |
2016年 | 7篇 |
2015年 | 4篇 |
2014年 | 8篇 |
2013年 | 35篇 |
2012年 | 24篇 |
2011年 | 32篇 |
2010年 | 17篇 |
2009年 | 10篇 |
2008年 | 24篇 |
2007年 | 19篇 |
2006年 | 23篇 |
2005年 | 35篇 |
2004年 | 19篇 |
2003年 | 15篇 |
2002年 | 11篇 |
2001年 | 17篇 |
2000年 | 24篇 |
1999年 | 10篇 |
1998年 | 9篇 |
1997年 | 4篇 |
1996年 | 7篇 |
1995年 | 6篇 |
1994年 | 13篇 |
1993年 | 17篇 |
1992年 | 12篇 |
1991年 | 11篇 |
1990年 | 12篇 |
1989年 | 5篇 |
1988年 | 8篇 |
1987年 | 8篇 |
1986年 | 13篇 |
1985年 | 9篇 |
1984年 | 10篇 |
1983年 | 14篇 |
1982年 | 11篇 |
1981年 | 13篇 |
1980年 | 12篇 |
1979年 | 15篇 |
1978年 | 13篇 |
1977年 | 17篇 |
1976年 | 10篇 |
1975年 | 16篇 |
1974年 | 10篇 |
1973年 | 18篇 |
1972年 | 11篇 |
1966年 | 4篇 |
1942年 | 5篇 |
排序方式: 共有696条查询结果,搜索用时 15 毫秒
661.
662.
663.
664.
666.
667.
Theory of the time-dependent-thermal-lensing (TDTL) technique as used in energy-transfer experiments
A unified theory of the TDTL technique that incorporates energy-transfer rates, diffusion, and thermal conductivity is presented. In the appropriate limits, the unified approach reduces to simplified theories that have appeared in the literature. Example calculations are given and the physics of the effect is discussed. 相似文献
668.
Alavi-Harati A Albuquerque IF Alexopoulos T Arenton M Arisaka K Averitte S Barker AR Bellantoni L Bellavance A Belz J Ben-David R Bergman DR Blucher E Bock GJ Bown C Bright S Cheu E Childress S Coleman R Corcoran MD Corti G Cox B Crisler MB Erwin AR Ford R Glazov A 《Physical review letters》2000,84(3):408-411
We report the first observation of a manifestly CP violating effect in the K(L)-->pi(+)pi(-)e(+)e(-) decay mode. A large asymmetry was observed in the distribution of these decays in the CP-odd and T-odd angle straight phi between the decay planes of the e(+)e(-) and pi(+)pi(-) pairs in the K(L) center of mass system. After acceptance corrections, the overall asymmetry is found to be [13.6+/-2. 5(stat)+/-1.2(syst)]%. This is the largest CP-violating effect yet observed when integrating over the entire phase space of a mode and the first such effect observed in an angular variable. 相似文献
669.
A two-photon laser-induced fluorescence study on the transport of ground-state atomic hydrogen in a supersonic plasma jet, generated from an Ar-H (2) mixture, reveals an unexpected shock pattern. Whereas both the axial-velocity profile and the temperature profile of hydrogen atoms along the jet centerline can be interpreted in terms of a supersonic expansion of an Ar-H gas mixture, the H-atom density profiles do not satisfy the well established Rankine-Hugoniot relation leading to a nonconservation of the forward flux. The experimental results show that H atoms escape from the supersonic expansion by a diffusion process due to strong density gradients between the core of the jet and its vicinity. 相似文献
670.
Alavi-Harati A Alexopoulos T Arenton M Arisaka K Averitte S Barker AR Bellantoni L Bellavance A Belz J Ben-David R Bergman DR Blucher E Bock GJ Bown C Bright S Cheu E Childress S Coleman R Corcoran MD Corti G Cox B Crisler MB Erwin AR Ford R Glazov A Golossanov A 《Physical review letters》2000,84(12):2593-2597
We present results of a search for a new form of hadronic matter, a six-quark, dibaryon state called the H0, a state predicted to exist in several theoretical models. Analyzing data collected by experiment E799-II at Fermilab, we searched for the decay H0-->Lambdappi(-) and found no candidate events. We place an upper limit on [B(H0-->Lambdappi(-))dsigma(H)/dOmega]/(dsigma(Xi)/dOmega) and, in the context of published models, exclude the region of lightly bound mass states just below the LambdaLambda mass threshold, 2.194相似文献