全文获取类型
收费全文 | 595篇 |
免费 | 9篇 |
国内免费 | 1篇 |
专业分类
化学 | 347篇 |
晶体学 | 2篇 |
力学 | 8篇 |
数学 | 105篇 |
物理学 | 143篇 |
出版年
2022年 | 6篇 |
2020年 | 9篇 |
2019年 | 7篇 |
2017年 | 8篇 |
2016年 | 10篇 |
2015年 | 10篇 |
2013年 | 27篇 |
2012年 | 14篇 |
2011年 | 10篇 |
2010年 | 13篇 |
2009年 | 10篇 |
2008年 | 13篇 |
2007年 | 20篇 |
2006年 | 17篇 |
2005年 | 12篇 |
2004年 | 16篇 |
2003年 | 14篇 |
2002年 | 11篇 |
2001年 | 6篇 |
2000年 | 9篇 |
1999年 | 7篇 |
1996年 | 7篇 |
1995年 | 7篇 |
1994年 | 15篇 |
1993年 | 12篇 |
1992年 | 9篇 |
1991年 | 7篇 |
1990年 | 6篇 |
1989年 | 11篇 |
1988年 | 7篇 |
1987年 | 8篇 |
1986年 | 7篇 |
1985年 | 6篇 |
1984年 | 7篇 |
1982年 | 13篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1979年 | 11篇 |
1978年 | 7篇 |
1977年 | 8篇 |
1975年 | 7篇 |
1974年 | 7篇 |
1973年 | 6篇 |
1963年 | 5篇 |
1962年 | 5篇 |
1958年 | 5篇 |
1895年 | 5篇 |
1890年 | 6篇 |
1886年 | 10篇 |
1882年 | 9篇 |
排序方式: 共有605条查询结果,搜索用时 15 毫秒
601.
We investigate a composite quantum collision model with measurements on the memory part, which effectively probe the system. The framework allows us to adjust the measurement strength, thereby tuning the dynamical map of the system. For a two-qubit setup with a symmetric and informationally complete measurement on the memory, we study the divisibility of the resulting dynamics in dependence of the measurement strength. The measurements give rise to quantum trajectories of the system and we show that the average asymptotic purity depends on the specific form of the measurement. With the help of numerical simulations, we demonstrate that the different performance of the measurements is generic and holds for almost all interaction gates between the system and the memory in the composite collision model. The discrete model is then extended to a time-continuous limit. 相似文献
602.
Claudius Lupfer Sebastian Seitel Oliver Skarsetz Andreas Walther 《Angewandte Chemie (International ed. in English)》2023,62(41):e202309236
Cellular organisms possess intricate mechano-adaptive systems that enable them to sense forces and process them with (bio)chemical circuits for functional adaptation. Inspired by such processes, this study introduces a hydrogel system capable of mechanically activated and chemically transduced self-destruction. Our judiciously designed hydrogels can mechanically generate radicals that are processed and amplified in a self-propagating radical de-crosslinking reaction, ultimately leading to mechanically triggered self-immolation. We put such systems to work in mechano-induced debonding, and in a bilayer actuator, where swelling-induced bending generates sufficient force for selective degradation of one layer, leading to autonomous self-regulation associated with unbending. Our work helps define design criteria for molecularly controlled adaptive and self-regulating materials with embodied mechano-chemical information processing, and showcases their potential for adhesives and soft robotics. 相似文献
603.
604.
Maria Wierzbicka-Wieczorek Martin Goeckeritz Uwe Kolitsch Christoph Lenz Gerald Giester 《ChemInform》2015,46(30):no-no
Single crystals of Cs1.86K1.14DySi6O15 (I) and Cs1.6K1.4SmSi6O15 (II) are grown by reaction of SmF3 or Dy2O3, DyF3, SiO2, K2CO3, and Cs2CO3 in a MoO3 or MoO3/RbF flux (Pt crucible, 950 °C, 3—6 h; controlled cooling). 相似文献
605.
Poly (β-hydroxylbutyrate-co-benzyl β-malolactonate), (P-HB-co-BML) copolymers, were prepared by the ring-opening copolymerizations of β-butyrolactone (BL) and benzyl β-malolactone (BML) with several alkyl aluminoxane catalysts, including ethylaluminoxane (EAO), methylaluminoxane (MAO), and isobutylaluminoxane (IBAO). The copolymers had very broad molecular weight distributions with weight average molecular weights, M̄w, greater than 200,000. The products were fractionated by solubility into acetone-soluble and insoluble copolymers. The former were random, atactic copolymers while the latter were stereoblock copolymers. Random, atactic copolyesters of these two monomers were also obtained with the diethylzinc-water, ZnEt2-H2O (0.6:1), and the (5,10,15,20-tetraphenylporphinato)aluminium chloride, TPPAlCl, catalysts. The copolymerization reactions with the latter two catalysts gave much higher yields (up to 98%) and better control of both the copolymer compositions and the molecular weight distributions, but these copolymers had M̄w values of only 20,000 or less. The copolymer tacticities and comonomer sequences were determined by 13C NMR spectroscopy. 相似文献