全文获取类型
收费全文 | 585篇 |
免费 | 12篇 |
国内免费 | 4篇 |
专业分类
化学 | 504篇 |
晶体学 | 5篇 |
力学 | 6篇 |
数学 | 21篇 |
物理学 | 65篇 |
出版年
2021年 | 2篇 |
2019年 | 3篇 |
2017年 | 3篇 |
2016年 | 4篇 |
2015年 | 7篇 |
2014年 | 11篇 |
2013年 | 22篇 |
2012年 | 22篇 |
2011年 | 24篇 |
2010年 | 17篇 |
2009年 | 19篇 |
2008年 | 25篇 |
2007年 | 29篇 |
2006年 | 34篇 |
2005年 | 25篇 |
2004年 | 23篇 |
2003年 | 24篇 |
2002年 | 16篇 |
2001年 | 6篇 |
2000年 | 13篇 |
1999年 | 11篇 |
1998年 | 9篇 |
1997年 | 9篇 |
1996年 | 19篇 |
1995年 | 10篇 |
1994年 | 3篇 |
1993年 | 10篇 |
1992年 | 11篇 |
1991年 | 11篇 |
1990年 | 10篇 |
1989年 | 11篇 |
1988年 | 6篇 |
1987年 | 6篇 |
1986年 | 2篇 |
1985年 | 14篇 |
1984年 | 13篇 |
1983年 | 12篇 |
1982年 | 9篇 |
1981年 | 8篇 |
1980年 | 13篇 |
1979年 | 16篇 |
1978年 | 9篇 |
1977年 | 8篇 |
1976年 | 7篇 |
1975年 | 7篇 |
1974年 | 9篇 |
1972年 | 4篇 |
1969年 | 1篇 |
1968年 | 5篇 |
1967年 | 3篇 |
排序方式: 共有601条查询结果,搜索用时 214 毫秒
81.
Hiroyuki Kawai Yoichi Hayakawa Masaya Nakagawa Kazuo Furihata Haruo Seto Noboru Ōtake 《Tetrahedron letters》1984,25(18):1937-1940
Based on 1H- and 13C-NMR and mass spectral analysis and chemical degradation, the structures of degradation products of arugomycin (arugorol, AG1, AG2 and AG3) have been determined as shown in Fig. 1. 相似文献
82.
Trimethylene carbonate was readily obtained in the reaction of oxetane and carbon dioxide in the presence of tetraphenylstibonium iodide. 相似文献
83.
Yasuaki Masumoto Haruo Kunitomo Shigeo Shionoya Hiro Munekata Hiroshi Kukimoto 《Solid State Communications》1984,51(4):209-212
Photoluminescence of aSixC1?x:H (x~0.2) is studied with a particular interest on the localization of carriers. Taking the polarization memory of luminescence as a probe, we clarify the localized character of photo-generated carriers as functions of excitation photon energy, emitted photon energy, temperature and time. The picosecond time-resolved measurement of the polarization memory is shown useful to study dynamical relaxation processes of carriers in disordered systems. 相似文献
84.
Haruo Yoshida 《Communications in Mathematical Physics》1988,116(4):529-538
Two sufficient conditions for the non-existence of an additional analytic integral are given for Hamiltonian systems with non-homogeneous polynomial potential of an arbitrary degree. An application is made to the truncated three-particle Toda lattice, which is proved to be non-integrable at any order. 相似文献
85.
86.
Kazuo Furihata Haruo Seto Muneki Ohuchi Noboru Otake 《Magnetic resonance in chemistry : MRC》1983,21(10):624-627
A new method based on the combination of selective proton decoupling and INEPT is explained in detail. This technique, named selective INEPT (SEL-INEPT), is a useful and sensitive method for the 13C NMR assignment of methylene carbons with non-equivalent protons. The 13C NMR spectrum of monensin has been analysed by the application of this technique. 相似文献
87.
Complex equilibria between cadmium ions and 2-mercaptoacetic acid (H2maa) or 2-mercaptopropionic acid (H2mpa) have been studied in aqueous solutions containing 3 mol dm?3 LiClO4 as a constant ionic medium at 25°C by potentiometric titration. Formation constants of mono-η and bis-2-mercaptoalkanoato)cadmium complexes were found to ge log K11 = 4.34 and log K12 = 2.15 for the cadmium-H2maa complexes, and log K11 = 5.66 and log K12 = 2.85 for the cadmium-H2mpa complexes, respectively. The protonated complexes, CdHmaa+ and CdHmpa+, and a mixed ligand complex, Cd(maa)(mpa)2- were also detected. 相似文献
88.
89.
Professor Haruo Totoki 《Probability Theory and Related Fields》1970,15(2):157-167
Summary A special flow, in which the basic automorphism is a Bernoulli automorphism and the ceiling function depends only on the present position of the Bernoulli sequence and is not lattice distributed, is a K-flow.This paper represents the result, in a revised form, which was presented at the Symposium on Ergodic Theory held at Mathematisches Forschungsinstitut Oberwolfach from August 4 to 10, 1968. 相似文献
90.
Mikio Hori Tadashi Kataoka Hiroshi Shimizu Sachio Ohno Kenichi Narita Hiroaki Takayanagi Haruo Ogura Yoichi Iitaka 《Tetrahedron letters》1979,20(44):4315-4318
The first success of an X-ray analysis of a thiabenzene derivative, 1-benzoyl-2-methyl-2-thianaphthalene is described. 相似文献