全文获取类型
收费全文 | 132篇 |
免费 | 2篇 |
国内免费 | 2篇 |
专业分类
化学 | 51篇 |
晶体学 | 3篇 |
力学 | 5篇 |
数学 | 50篇 |
物理学 | 27篇 |
出版年
2021年 | 3篇 |
2020年 | 4篇 |
2019年 | 3篇 |
2016年 | 8篇 |
2015年 | 5篇 |
2014年 | 3篇 |
2013年 | 6篇 |
2012年 | 5篇 |
2011年 | 8篇 |
2009年 | 4篇 |
2008年 | 8篇 |
2007年 | 8篇 |
2006年 | 4篇 |
2005年 | 6篇 |
2004年 | 2篇 |
2003年 | 5篇 |
2002年 | 7篇 |
2001年 | 5篇 |
2000年 | 5篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 6篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1991年 | 4篇 |
1989年 | 3篇 |
1986年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1979年 | 2篇 |
1973年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有136条查询结果,搜索用时 15 毫秒
131.
S. Franchi A. Bosacchi F. Colonna P. Pascarella P. Allegri V. Avanzini 《Journal of Crystal Growth》1995,150(1-4):185-189
We present a comparative study on In surface segregation in InGaAs/GaAs structures prepared by molecular beam epitaxy (MBE) and atomic layer MBE (ALMBE) at different growth temperatures. The effect of segregation is evaluated by the energy position of exciton transitions in pseudomorphic 10 ML thick InxGa1−xAs/GaAs (0.15≤x≤0.30) and in 1 ML thick InAs/GaAs quantum wells. We show that: (i) In segregation decreases with the growth temperatures and is minimized at ALMBE and MBE growth temperatures lower than 260 and 340°C, respectively, and (ii) the segregation is more effective in ALMBE structures than in the MBE counterparts. The growth conditions that have been singled out allow the preparation of structures with high photoluminescence efficiencies even at the low growth temperatures required to minimize In segregation. 相似文献
132.
We define and study on Lorentz manifolds a family of covariant diffusions in which the quadratic variation is locally determined
by the curvature. This allows the interpretation of the diffusion effect on a particle by its interaction with the ambient
space-time. We will focus on the case of warped products, especially Robertson-Walker manifolds, and analyse their asymptotic
behaviour in the case of Einstein-de Sitter-like manifolds. 相似文献
133.
Mileo E Casati C Franchi P Mezzina E Lucarini M 《Organic & biomolecular chemistry》2011,9(8):2920-2924
The first example of paramagnetic rotaxane containing cucurbit[6]urils has been reported and characterized both by ESR and NMR spectroscopy. 相似文献
134.
Science China Mathematics - In this paper, we prove Poincaré and Sobolev inequalities for differential forms in L1(ℝn). The singular integral estimates that it is possible to use for Lp,... 相似文献
135.
136.
Giovanna Bruni Franco Sartor Vittorio Berbenni Chiara Milanese Mariarosa Maietta Dionigio Franchi Amedeo Marini 《Journal of Thermal Analysis and Calorimetry》2012,108(1):381-388
In this study, we present a full thermal characterization of antidepressant paroxetine and summarize the results for another drug which treats depression: GW597599B. The main aim is to analyze how the thermodynamic and structural properties of these compounds are modified when the two drugs are mixed in the solid state. We begin by putting into evidence how dehydration and melting concur in shaping the calorimetric curves of paroxetine under different experimental conditions. Equipped with this knowledge, we are able to interpret the thermal response of the physical mixtures paroxetine:GW597599B, in terms of partial eutectic formation and simple superposition of contribution from the two compounds. 相似文献