全文获取类型
收费全文 | 170篇 |
免费 | 0篇 |
国内免费 | 1篇 |
专业分类
化学 | 118篇 |
晶体学 | 3篇 |
力学 | 1篇 |
数学 | 15篇 |
物理学 | 34篇 |
出版年
2021年 | 1篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 4篇 |
2017年 | 1篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 10篇 |
2012年 | 2篇 |
2011年 | 12篇 |
2010年 | 3篇 |
2009年 | 11篇 |
2008年 | 3篇 |
2007年 | 7篇 |
2006年 | 2篇 |
2005年 | 7篇 |
2004年 | 7篇 |
2003年 | 6篇 |
2002年 | 5篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1992年 | 4篇 |
1991年 | 3篇 |
1990年 | 5篇 |
1988年 | 4篇 |
1987年 | 1篇 |
1985年 | 7篇 |
1984年 | 7篇 |
1983年 | 2篇 |
1982年 | 3篇 |
1981年 | 7篇 |
1980年 | 6篇 |
1979年 | 5篇 |
1978年 | 2篇 |
1975年 | 1篇 |
1974年 | 2篇 |
1973年 | 1篇 |
1972年 | 1篇 |
1970年 | 2篇 |
1968年 | 3篇 |
1957年 | 1篇 |
排序方式: 共有171条查询结果,搜索用时 0 毫秒
21.
K Okamoto M Matsumoto M Watanabe M Kawada T Imamoto I Imada 《Chemical & pharmaceutical bulletin》1985,33(9):3745-3755
22.
Various types of α-cyanoallylic acetates were undergone the palladium-catalyzed rearrangement to give the γ-acetoxy-α,β-unsaturated nitriles in high yields. These rearranged acetates were conveniently transformed into the furan derivatives often encountered in natural products by the reduction using diisobutylaluminum hydride. 相似文献
23.
24.
25.
K. Tshoo Y. Satou H. Bhang S. Choi T. Nakamura S. Deguchi Y. Kawada Y. Kondo N. Kobayashi Y. Nakayama K. N. Tanaka N. Tanaka N. Aoi M. Ishihara T. Motobayashi H. Otsu H. Sakurai S. Takeuchi Y. Togano K. Yoneda Z. H. Li F. Delaunay J. Gibelin F. M. Marques N. A. Orr T. Honda M. Matsushita T. Kobayashi Y. Miyashita T. Sumikama K. Yoshinaga S. Shimoura D. Sohler T. Zheng Z.X. Cao 《Few-Body Systems》2013,54(1-4):459-463
The unbound excited states of the most neutron-rich dripline oxygen isotope, 24O, have been investigated by using the 24O(p,p′)24O* reaction at the beam energy of 62 MeV/nucleon in inverse kinematics. The first and second unbound excited states of 24O have been observed at ${E_{\rm x}= 4.63_{-0.14}^{+0.30}}$ MeV and ${E_{\rm x}= 5.13_{-0.24}^{+0.19}}$ MeV (preliminary) along with the evidence for another higher lying state at around 7.3 MeV. The quadrupole deformation parameter ${\beta_{2^+}}$ was deduced to be ${0.15_{-0.03}^{+0.08}}$ (preliminary) for the first time. The systematics of the ${\beta_{2^+}}$ and the ${E_{\rm x}(2_1^+)}$ in the Z = 8 isotopes shows the N = 16 spherical shell closure in 24O. 相似文献
26.
Recently, there have been numerous reports on the application of non-thermal ultrasound energy for treating various diseases in combination with drugs. Furthermore, the introduction of microbubbles and nanobubbles as carriers/enhancers of drugs has added a whole new dimension to therapeutic ultrasound. Non-thermal mechanisms for effects seen include various forms of energy due to cavitation, acoustic streaming, micro jets and radiation force which increases possibilities for targeting tissue with drugs, enhancing drug effectiveness or even chemically activating certain materials. Examples such as enhancement of thrombolytic agents by ultrasound have proven to be beneficial for acute stroke patients and peripheral arterial occlusions. Non-invasive low intensity focused ultrasound in conjunction with anti-cancer drugs may help to reduce tumor size and lessen recurrence while reducing severe drug side effects. Chemical activation of drugs by ultrasound energy for treatment of atherosclerosis and tumors is another new field recently termed as “Sonodynamic therapy”. Lastly, advances in molecular imaging have aroused great expectations in applying ultrasound for both diagnosis and therapy simultaneously. Microbubbles or nanobubbles targeted at the molecular level will allow medical doctors to make a final diagnosis of a disease using ultrasound imaging and then immediately proceed to a therapeutic ultrasound treatment. 相似文献
27.
Izumi Sakamoto Kazuya Iwaoka Yuta Kawada Takanori Naito Kazuyoshi Makida Yuki Takeuchi Takeshi Nishii Mitsuyo Horikawa Hiroto Kaku Tetsuto Tsunoda 《Tetrahedron》2018,74(24):3052-3060
3,3-Dimethoxypropylsulfonyl (Dimps) chloride was prepared and used as a new versatile sulfonating agent for ammonia, primary and secondary amines to afford corresponding Dimps-amides in excellent yields. The resulting N-nonsubstituted and N-monosubstituted Dimps-amides, activated amines, were alkylated satisfactorily under new Mitsunobu conditions. The Dimps group was removed by treatment in aqueous solution under acidic followed by basic conditions. Furthermore, epilachnene, the defensive droplets from the Mexican bean beetle, Epilachna varivestis, was synthesized utilizing this Dimps methodology in short steps. 相似文献
28.
29.
Hideo Hosono Katsuro Hayashi Koichi Kajihara Peter V. Sushko Alexander L. Shluger 《Solid State Ionics》2009,180(6-8):550-555
12CaO·7Al2O3 (C12A7) with a unique nano-porous structure and free O2? ions entrapped in sub-nanometer-sized cages is a fast oxygen-ion-conducting material. These free O2– may be replaced by various oxygen-related species, OH?, O2? and O?, by tuning the atmosphere during the heat treatment. We examined the conduction mechanism for stoichiometric C12A7 (C12A7:O2?), in which O2? ions exist as counter anions in sub-nanometer-sized cages, by Raman measurement of C12A7:O2? annealed in a dry 18O2 atmosphere. It was revealed that the primary ion conducting species is an O2? ion which diffuses via exchange with O2? in the cage wall. An experimental result on the sample containing O? ions implied that O? is more mobile than O2? in C12A7. Ab initio calculations on the diffusion paths of O2? and O? ions in C12A7 supported the above experimental results. 相似文献
30.
Toshinari Kawada Yuko Yoneda Kensaku Shimizu Chiori Itoh 《Monatshefte für Chemie / Chemical Monthly》2009,18(1):1257-1260