全文获取类型
收费全文 | 444篇 |
免费 | 12篇 |
国内免费 | 18篇 |
专业分类
化学 | 77篇 |
晶体学 | 7篇 |
力学 | 138篇 |
数学 | 31篇 |
物理学 | 221篇 |
出版年
2023年 | 15篇 |
2022年 | 6篇 |
2021年 | 7篇 |
2020年 | 9篇 |
2019年 | 4篇 |
2018年 | 12篇 |
2017年 | 10篇 |
2016年 | 11篇 |
2015年 | 16篇 |
2014年 | 28篇 |
2013年 | 35篇 |
2012年 | 20篇 |
2011年 | 32篇 |
2010年 | 26篇 |
2009年 | 35篇 |
2008年 | 33篇 |
2007年 | 27篇 |
2006年 | 34篇 |
2005年 | 16篇 |
2004年 | 12篇 |
2003年 | 11篇 |
2002年 | 14篇 |
2001年 | 8篇 |
2000年 | 9篇 |
1999年 | 10篇 |
1998年 | 7篇 |
1997年 | 4篇 |
1996年 | 10篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 4篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1982年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有474条查询结果,搜索用时 31 毫秒
471.
472.
Dr. Guangmao Li Prof. Zhihua Yang Prof. Xueling Hou Prof. Shilie Pan 《Angewandte Chemie (International ed. in English)》2023,62(22):e202303711
Birefringent crystals are requisite optical devices in laser and modern opto-electronic fields. Development of excellent birefringent materials is still challenging. Herein, the linear or chain-like [Sx] (x=2–6) species were theoretically proved to be the origin of the large birefringence, and could be regarded as birefringent genes. Besides, the metal polysulfide family was first proposed to be rich birefringent materials source, among which Cs2S6 realizes giant birefringence 0.58@1064 nm together with a wide band gap of 1.70 eV (based on the generalized gradient approximation). Moreover, the first dual-anion group polysulfide Na4Ba3(S2)4S3 was obtained, showing wide infrared transmission range (0.5–6.2 μm), wide band gap (2.3 eV), and large birefringence (0.37 at 1064 nm). This work provides a new guiding thought for exploring large birefringence crystals in the future. 相似文献
473.
Hao Jia Dr. Baipeng Yin Jiaying Chen Prof. Ye Zou Hong Wang Yu Zhang Prof. Tongmei Ma Prof. Qiang Shi Prof. Jiannian Yao Prof. Shuming Bai Prof. Chuang Zhang 《Angewandte Chemie (International ed. in English)》2023,62(35):e202309073
Macroscopic compass-like magnetic alignment at low magnetic fields is natural for ferromagnetic materials but is seldomly observed in paramagnetic materials. Herein, we report a “paramagnetic compass” that magnetically aligns under ∼mT fields based on the single-crystalline framework constructed by lanthanide ions and organic ligands (Ln-MOF). The magnetic alignment is attributed to the Ln-MOF's strong macroscopic anisotropy, where the highly-ordered structure allows the Ln-ions’ molecular anisotropy to be summed according to the crystal symmetry. In tetragonal Ln-MOFs, the alignment is either parallel or perpendicular to the field depending on the easiest axis of the molecular anisotropy. Reversible switching between the two alignments is realized upon the removal and re-adsorption of solvent molecules filled in the framework. When the crystal symmetry is lowered in monoclinic Ln-MOFs, the alignments become even inclined (47°-66°) to the field. These fascinating properties of Ln-MOFs would encourage further explorations of framework materials containing paramagnetic centers. 相似文献
474.
Prof. Shujuan Han Abudukadi Tudi Wenbin Zhang Prof. Xueling Hou Prof. Zhihua Yang Prof. Shilie Pan 《Angewandte Chemie (International ed. in English)》2023,62(26):e202302025
The combination of SnII or SbIII with π, non-π-conjugated units has produced birefringent crystals with birefringence ranging from 0.005 to 0.468@1064 nm. It is proven that introducing SnII or SbIII into crystals is a feasible strategy to enlarge the birefringence, which not only promotes the miniaturization of fabricated devices, but also effectively modulates polarized light. Herein, recently discovered SnII, SbIII-based birefringent crystals with birefringence investigated are summarized, including their crystal structure and optical properties, especially birefringence. This review also presents the influence of SnII, SbIII with stereochemically active lone pair on the optical anisotropy. We hope that this work provides a clear perspective on the crystal chemistry of SnII, SbIII-based optical functional crystals and promotes the development of new birefringent crystals with large optical anisotropy. 相似文献