全文获取类型
| 收费全文 | 580篇 |
| 免费 | 3篇 |
| 国内免费 | 8篇 |
专业分类
| 化学 | 404篇 |
| 晶体学 | 9篇 |
| 力学 | 3篇 |
| 数学 | 24篇 |
| 物理学 | 151篇 |
出版年
| 2023年 | 5篇 |
| 2022年 | 9篇 |
| 2020年 | 7篇 |
| 2019年 | 13篇 |
| 2017年 | 6篇 |
| 2016年 | 11篇 |
| 2015年 | 5篇 |
| 2014年 | 13篇 |
| 2013年 | 24篇 |
| 2012年 | 16篇 |
| 2011年 | 21篇 |
| 2010年 | 21篇 |
| 2009年 | 16篇 |
| 2008年 | 22篇 |
| 2007年 | 32篇 |
| 2006年 | 38篇 |
| 2005年 | 15篇 |
| 2004年 | 29篇 |
| 2003年 | 29篇 |
| 2002年 | 27篇 |
| 2001年 | 13篇 |
| 2000年 | 12篇 |
| 1999年 | 14篇 |
| 1998年 | 13篇 |
| 1997年 | 4篇 |
| 1996年 | 8篇 |
| 1995年 | 4篇 |
| 1994年 | 5篇 |
| 1993年 | 7篇 |
| 1992年 | 9篇 |
| 1989年 | 4篇 |
| 1988年 | 7篇 |
| 1987年 | 7篇 |
| 1985年 | 4篇 |
| 1983年 | 5篇 |
| 1982年 | 8篇 |
| 1981年 | 6篇 |
| 1980年 | 3篇 |
| 1979年 | 12篇 |
| 1978年 | 7篇 |
| 1977年 | 5篇 |
| 1976年 | 3篇 |
| 1975年 | 3篇 |
| 1974年 | 11篇 |
| 1973年 | 4篇 |
| 1970年 | 4篇 |
| 1969年 | 8篇 |
| 1968年 | 6篇 |
| 1967年 | 11篇 |
| 1966年 | 3篇 |
排序方式： 共有591条查询结果，搜索用时 0 毫秒
71.
The Hartree-Fock approximation has been generalized to incorporate the nonadiabatic effect of molecular vibration previously by Tachibana et al. Here, we will derive the Hartree-Fock equation which reflects also the nonlinear effect of the infrared radiation field as well by using the Bloch-Nordsieck transformation which was discussed first by Nguyen-Dang and Bandrauk in the field of molecular physics. The Hartree-Fock equation reflects the non-adiabatic coupling between an electron and a molecular vibration and between the electron and a infrared radiation fields. The infrared radiation field also affects the dynamics of nuclear motion.Dedicated to Professor J. Koutecký on the occasion of his 65th birthday 相似文献
72.
Dr. Ke Gao Norihito Fukui Seok II Jung Prof. Dr. Hideki Yorimitsu Prof. Dr. Dongho Kim Prof. Dr. Atsuhiro Osuka 《Angewandte Chemie (International ed. in English)》2016,55(42):13038-13042
Doubly and quadruply quinoline‐fused porphyrins were effectively synthesized through a reaction sequence consisting of Suzuki–Miyaura coupling of β‐borylated porphyrins with 2‐iodoaniline and subsequent Pictet–Spengler cyclization. These quinoline‐fused porphyrins display red‐shifted absorption bands and higher electron‐accepting abilities. This synthetic protocol also allowed the synthesis of phenanthroline‐fused porphyrin dimers, which bound either a NiII or ZnII cation. The resultant metal complexes displayed further red shifted absorption spectra and molecular twists to effect an almost perpendicular arrangement of the two porphyrins. 相似文献
73.
74.
Miura Y Takiguchi Y Shirao M Takata S Yanagida T Fukui H Naganuma M Hatao M 《Photochemistry and photobiology》2008,84(6):1569-1575
In the in vitro evaluation of Sun Protection Factor (SPF), the photostability of the ultraviolet (UV) filters can have a major impact, especially for high-SPF formulations, but is generally not taken into consideration. In this study, we present a UV transmission spectrum measurement system utilizing a high-sensitivity UV photomultiplier tube with concomitant evaluation of photostability. We have developed an algorithm to estimate SPF in vitro by converting the amount of UV light transmission through the sunscreen layer into cumulative relative erythema effectiveness to obtain one minimal erythema dose. Thus, the algorithm uses the same endpoint as in vivo SPF methods, but with a photomultiplier tube as the detector instead of skin. The values obtained showed an excellent correlation with in vivo SPF values, even for high-SPF sunscreens exceeding SPF 50. This method should be suitable as an in vitro SPF testing method for regulatory purposes. 相似文献
75.
76.
Ohashi M Matsubara K Iizuka T Suzuki H 《Angewandte Chemie (International ed. in English)》2003,42(8):937-940
77.
78.
79.
80.
Tsutomu Kagiya Shizuo Narisawa Taizo Ichida Kenichi Fukui Hisao Yokota Masatsune Kondo 《Journal of polymer science. Part A, Polymer chemistry》1966,4(2):293-299
The copolymerization of carbon monoxide and aziridines such as ethylenimine and propylenimine was carried out by γ-ray irradiation. Aziridines and carbon monoxide were allowed to copolymerize under γ-ray irradiation from a Co60 source and gave a crystalline solid copolymer. The yield of the copolymer increased with reaction temperature. The composition of copolymers obtained did not depend on the feed ratio of monomers and was found to be almost equimolar. The copolymer of ethylenimine and carbon monoxide melted at about 322–335°C. with decomposition and has an infrared spectrum identical with that of poly-β-alanine obtained by the hydrogen-migration polymerization of acrylamide. The hydrolyzed product of the ethylenimine–carbon monoxide copolymer was confirmed to be β-alanine by paper chromatography. These results lead to the conclusion that the copolymerization of aziridines and carbon monoxide took place alternatively by γ-ray irradiation, and produced crystalline poly-β-alanines. 相似文献