全文获取类型
收费全文 | 361篇 |
免费 | 5篇 |
国内免费 | 1篇 |
专业分类
化学 | 213篇 |
晶体学 | 5篇 |
力学 | 2篇 |
数学 | 3篇 |
物理学 | 144篇 |
出版年
2021年 | 3篇 |
2020年 | 6篇 |
2019年 | 5篇 |
2018年 | 2篇 |
2016年 | 4篇 |
2015年 | 5篇 |
2014年 | 3篇 |
2013年 | 18篇 |
2012年 | 6篇 |
2011年 | 17篇 |
2010年 | 8篇 |
2009年 | 5篇 |
2008年 | 19篇 |
2007年 | 16篇 |
2006年 | 19篇 |
2005年 | 9篇 |
2004年 | 13篇 |
2003年 | 13篇 |
2002年 | 8篇 |
2001年 | 9篇 |
2000年 | 13篇 |
1999年 | 10篇 |
1998年 | 2篇 |
1997年 | 7篇 |
1996年 | 6篇 |
1995年 | 6篇 |
1994年 | 3篇 |
1993年 | 8篇 |
1992年 | 7篇 |
1991年 | 6篇 |
1990年 | 8篇 |
1989年 | 10篇 |
1988年 | 6篇 |
1987年 | 8篇 |
1986年 | 5篇 |
1985年 | 13篇 |
1983年 | 6篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 6篇 |
1979年 | 11篇 |
1978年 | 10篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1975年 | 2篇 |
1974年 | 3篇 |
1970年 | 2篇 |
1969年 | 2篇 |
1965年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有367条查询结果,搜索用时 78 毫秒
1.
2.
3.
Dr. Koichi Mitsudo Ren Matsuo Toki Yonezawa Haruka Inoue Dr. Hiroki Mandai Prof. Dr. Seiji Suga 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(20):7877-7881
The first electrochemical dehydrogenative C−S bond formation leading to thienoacene derivatives is described. Several thienoacene derivatives were synthesized by dehydrogenative C−H/S−H coupling. The addition of nBu4NBr, which catalytically promoted the reaction as a halogen mediator, was essential. 相似文献
4.
This paper introduces an elasto-plastic joint element characterised by strain hardening and softening in the analysis of dynamic
soil-structure interaction. The phenomena of separation and sliding on the contact surface between soil and structure can
be better simulated and the process can also be described. The interaction problems in a typical soil-structure system are
analyzed in terms of elasto-plastic joint element as well as elastic ones. The results show that the elasto-plastic joint
element is much better than the elastic one in modelling, especially in that the relative displacements accross the joint
element can be much greater than that of the elastic case. Separation and sliding are not only related to the coefficient
of friction and cohesion but also to their changes with plastic volumetric strain.
The project is supported by the Sciences Foundation of the Chinese Academy of Sciences and the Disaster Provention Institute
of Kyoto University (Japan). 相似文献
5.
Katsuya Maeyama Kenji Yamashita Shugo Maeda Noriyuki Yonezawa Shunichi Aikawa Yasuhiko Yoshida 《合成通讯》2013,43(23):4158-4170
Optically active aromatic ether ketone macrocycles containing 2,2′-dimethoxy-1,1′-binaphthyl-6,6′-diyl moieties were synthesized through electrophilic aromatic substitution reaction and stepwise nucleophilic aromatic substitution reactions. Structures of the resulting macrocycles were confirmed by NMR and matrix assisted laser desorption/ionization time of flight (MALDI-TOF) mass measurements. 相似文献
6.
A. Morimoto Y. Maeda T. Minamikawa Y. Yonezawa T. Shimizu 《Applied Physics A: Materials Science & Processing》1999,69(7):S703-S706
Yttrium iron garnet (YIG) films were grown by pulsed laser ablation (PLA) on (111) Gadolinium Gallium Garnet (GGG) substrates. The second harmonic of YAG laser (532 nm) with a high laser fluence was employed to produce YIG droplets efficiently. It was found that YIG films prepared at RT substrates have a large number of solidified droplets of various sizes. Highly oriented YIG crystals were grown on the (111) GGG substrate heated at 860 °C by PLA using a large number of molten droplets, suggesting an LPE-like growth. This YIG film shows a small ferrimagnetic resonance linewidth of 7.5 Oe. This value is quite small for films prepared by vapor-phase epitaxy techniques. 相似文献
7.
Zhong Huang Yohei Ishida Tetsu Yonezawa 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(38):13545-13549
The synthesis of high‐purity and high‐yield Au25 clusters protected by the basic pyridyl ethanethiol (HSCH2CH2Py, 4‐PyET and 2‐PyET) is presented. Single‐crystal X‐ray diffraction of the [Au25(4‐PyET)18]??Na+ clusters has revealed a structure similar to that known for the phenyl ethanethiolate analogue, but with pyridyl‐N coordination to Na+, a more relaxed ligand shell, and a profoundly layered arrangement in the solid state. Because of the pendant Py moiety, the [Au25(PyET)18]? clusters are endowed with unique (de)protonation equilibria, which has been characterized in detail by UV/Vis absorption and 1H NMR spectroscopy. [Au25(PyET)18]? clusters showed an unexpectedly H+‐dependent solubility that is tunable in aqueous and organic solvents. The successful synthesis of the basic Py‐terminated thiolate‐protected Au25 clusters paves the way to realize a new family of metalloid clusters possessing basic properties. 相似文献
8.
Takahiro Yonezawa Tatsuya Murakami Koichi Higashimine Antoine Fleurence Yoshifumi Oshima Yukiko Yamada-Takamura 《Surface and interface analysis : SIA》2019,51(1):95-99
Layered materials can be grown on various substrates through van der Waals epitaxy (vdWE) regardless of lattice mismatch. The atomistic study of the film-substrate interface in vdWE is becoming increasingly important due to their expected applications as two-dimensional (2D) materials. In this contribution, we have grown GaSe thin films on Ge(111) substrates by molecular beam epitaxy and studied the GaSe/Ge(111) interface using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Cross-sectional HAADF-STEM observations revealed that the grown layers adopt predominantly the expected wurtzite-like structure and stacking, but layers with zinc-blende-like structure, similar to Ga2Se3 but apparently different, and other layer stacking sequences, exist locally near the film-substrate interface. These results demonstrate that even in vdWE, structural changes can occur in the grown layers adjacent to the substrate, highlighting the importance of such interface for synthesizing and applying ultimately thin 2D materials. 相似文献
9.
We apply a newly developed many-body theory, tensor optimized antisymmetrized molecular dynamics (TOAMD), to nuclear matter using a relativistic bare nucleon-nucleon interaction in the relativistic framework. It becomes evident that the tensor interaction plays an important role in nuclear many-body system due to the role of the pion in a strongly interacting system. We take the relativistic nuclear matter (RNM) wave function as a basic state and add tensor and short-range correlation operators in the form of pion and omega-meson correlation functions acting on the RNM wave function using the concept of TOAMD. We use the Monte Carlo (Metropolis) method based on the Gaussian integration and the second quantization method for antisymmetrization to calculate all the matrix elements of the many-body Hamiltonian. We write the whole formula of the TOAMD method for numerical calculations of the nuclear binding and saturation properties of nuclear matter using one-boson exchange potential. 相似文献
10.