全文获取类型
收费全文 | 935篇 |
免费 | 25篇 |
国内免费 | 3篇 |
专业分类
化学 | 749篇 |
晶体学 | 14篇 |
力学 | 21篇 |
数学 | 47篇 |
物理学 | 132篇 |
出版年
2023年 | 5篇 |
2021年 | 5篇 |
2020年 | 7篇 |
2019年 | 13篇 |
2018年 | 10篇 |
2017年 | 9篇 |
2016年 | 14篇 |
2015年 | 16篇 |
2014年 | 14篇 |
2013年 | 44篇 |
2012年 | 38篇 |
2011年 | 49篇 |
2010年 | 25篇 |
2009年 | 32篇 |
2008年 | 53篇 |
2007年 | 62篇 |
2006年 | 65篇 |
2005年 | 50篇 |
2004年 | 56篇 |
2003年 | 51篇 |
2002年 | 42篇 |
2001年 | 13篇 |
2000年 | 17篇 |
1999年 | 9篇 |
1998年 | 15篇 |
1997年 | 11篇 |
1996年 | 11篇 |
1995年 | 9篇 |
1994年 | 7篇 |
1993年 | 7篇 |
1992年 | 5篇 |
1991年 | 8篇 |
1990年 | 8篇 |
1989年 | 9篇 |
1988年 | 10篇 |
1986年 | 5篇 |
1985年 | 16篇 |
1984年 | 18篇 |
1982年 | 13篇 |
1981年 | 13篇 |
1980年 | 5篇 |
1979年 | 8篇 |
1978年 | 11篇 |
1977年 | 16篇 |
1976年 | 10篇 |
1974年 | 7篇 |
1970年 | 4篇 |
1968年 | 4篇 |
1967年 | 4篇 |
1965年 | 4篇 |
排序方式: 共有963条查询结果,搜索用时 15 毫秒
961.
Jun Manabe Nagisa Sako Mizuki Ito Dr. Masaru Fujibayashi Dr. Chisato Kato Dr. Goulven Cosquer Prof. Katsuya Inoue Dr. Kiyonori Takahashi Prof. Takayoshi Nakamura Prof. Tomoyuki Akutagawa Dr. Seiya Shimono Dr. Hiroki Ishibashi Prof. Yoshiki Kubota Prof. Sadafumi Nishihara 《欧洲无机化学杂志》2023,26(34):e202300449
Materials exhibiting irreversible phase transitions, leading to changes in their properties, have a potential for novel application in electronic components such as a non-rewritable high-security memory. Here, we focused on the two salts, [(9-triptycylammonium)([18]crown-6)][Ni(dmit)2] ( 1 ) and [(9-triptycylammonium)([15]crown-5)][Ni(dmit)2] ( 2 ), which featured 2D sheet structures with alternately stacked cation and anion layers. Both salts exhibit similar cation arrangements, however, their anion arrangements differ significantly. The temperature-dependent magnetic susceptibilities of 1 and 2 were well reproduced by the alternating chain model (JAC1/kB=−306(8), JAC2/kB=−239(3) K) and the Curie-Weiss model (θ=−3.9(1) K), respectively. 1 experience a reversible phase transition around 40–60 K, causing anomalies in magnetic behavior. Moreover, an irreversible single-crystal-to-single-crystal phase transition to 1′ undergo at ~381 K, inducing a rearrangement of [Ni(dmit)2]− anions and a resistivity decrease from 6.5×106 to 6.5×102 Ω cm. The susceptibility curve of 1′ was reproduced by a combination of the Curie-Weiss and dimer models (Jdimer/kB=−407(5), θ=−26.7(5) K). The irreversible transition of 1 is the first example for such supramolecule and [Ni(dmit)2]− system to our knowledge, in opening potential new-type materials. 相似文献
962.
Masato Kurihara Kenya Kubo Tesuo Horikoshi Masaru Kurosawa Takuya Nankawa Takayuki Matsuda Hiroshi Nishihara 《Macromolecular Symposia》2000,156(1):21-29
This paper describes three topics on the π‐conjugated ferrocene oligomers and polymers; the first is the dependence of intervalence‐transfer bands for mixed‐valence oligo(1,1'‐dihexylferrocenylene)s on the oxidation number and the number of ferrocene units, the second is synthesis of azo‐bridged ferrocene oligomers and a polymer and electrochemical and optical analysis of internuclear electronic interactions in their mixed‐valence states and the third is synthesis, redox behaviors and electrodeposition of oligoferrocenylene‐modified gold clusters. 相似文献
963.
Jinhua Chen Shin Hasegawa Hitoshi Ohashi Yasunari Maekawa Masaru Yoshida Ryoichi Katakai Norio Tsubokawa 《Macromolecular rapid communications》2002,23(2):141-144
The impedance effect on the ion transport of lithium chloride through temperature‐ and pH‐sensitive gel membranes was investigated. Both conductance and loss tangent show a relatively high value at temperatures near the lower critical solution temperature (14°C), followed by an abrupt drop with a further rise in temperature. The Figure shows an example of changes in absolute complex conductance (Y ), real conductance (G ), and imaginary conductance (B) for a poly(acryloyl‐L ‐proline methyl ester) gel membrane. 相似文献