全文获取类型
收费全文 | 1423篇 |
免费 | 44篇 |
国内免费 | 11篇 |
专业分类
化学 | 809篇 |
晶体学 | 6篇 |
力学 | 35篇 |
数学 | 249篇 |
物理学 | 246篇 |
无线电 | 133篇 |
出版年
2023年 | 12篇 |
2022年 | 17篇 |
2021年 | 29篇 |
2020年 | 26篇 |
2019年 | 14篇 |
2018年 | 24篇 |
2017年 | 16篇 |
2016年 | 54篇 |
2015年 | 29篇 |
2014年 | 33篇 |
2013年 | 68篇 |
2012年 | 85篇 |
2011年 | 94篇 |
2010年 | 58篇 |
2009年 | 49篇 |
2008年 | 74篇 |
2007年 | 89篇 |
2006年 | 73篇 |
2005年 | 59篇 |
2004年 | 39篇 |
2003年 | 41篇 |
2002年 | 42篇 |
2001年 | 13篇 |
2000年 | 20篇 |
1999年 | 17篇 |
1998年 | 18篇 |
1997年 | 10篇 |
1996年 | 17篇 |
1995年 | 20篇 |
1994年 | 18篇 |
1993年 | 10篇 |
1992年 | 15篇 |
1991年 | 15篇 |
1990年 | 18篇 |
1989年 | 14篇 |
1988年 | 11篇 |
1987年 | 16篇 |
1986年 | 19篇 |
1985年 | 17篇 |
1984年 | 26篇 |
1983年 | 22篇 |
1982年 | 18篇 |
1981年 | 12篇 |
1980年 | 10篇 |
1979年 | 13篇 |
1978年 | 7篇 |
1976年 | 11篇 |
1975年 | 5篇 |
1974年 | 7篇 |
1972年 | 4篇 |
排序方式: 共有1478条查询结果,搜索用时 31 毫秒
41.
Alberto Bargagna Pietro Schenone Filippo Evangelisti 《Journal of heterocyclic chemistry》1979,16(1):93-96
The dipolar 1,4-cycloaddition of dichloroketene to N,N-disubstituted 3-amino-1-phenyl-2-propene-1-onesled directly to N,N-disubstituted 4-amino-3-chloro-6-phenyl-2H-pyran-2-ones only in the case of an usual aliphatic N,N-disubstitution. In the case of partial or full aromatic N-substitution, N,N-disubstituted 4-amino-3,3-dichloro-3,4-dihydro-6-phenyl-2H-pyran-2-ones were instead obtained, which were dehydrochlorinated with DBN to the corresponding 4-amino-3-chloro-6-phenyl-2H-pyran-2-ones. 相似文献
42.
Alberto Bargagna Pietro Schenone Mario Longobardi 《Journal of heterocyclic chemistry》1986,23(4):1067-1070
1,4-Cycloaddition of phenylchloroketene to N,N-disubstituted 2-aminomethylene-3,4-dihydro-1(2H)naphthalenones gave the corresponding adducts, namely N,N-disubstituted 4-amino-3-chloro-3,4,5,6-tetrahydro-3-phenyl-2H-naphtho[1,2-b]pyran-2-ones II, in the case of aliphatic N,N-disubstitution or aromatic N-monosubstitution. Apart from IIf (NR2 = NMePh), adducts II were unstable and were dehydrochlorinated in situ with DBN to give N,N-disubstituted 4-amino-5,6-dihydro-3-phenyl-2H-naphtho[1,2-b]pyran-2-ones III in fair overall yields. Compounds III were dehydrogenated with Pd/C in boiling p-cymene to afford the title compounds generally in high yields. 相似文献
43.
W. Daniel Carlisle David E. Fenton Patrick B. Roberts Umberto Casellato Pietro A. Vigato Rodolfo Graziani 《Transition Metal Chemistry》1986,11(8):292-295
Summary The crystal structure of the dinuclear complex [Cu2(C26H30-N4O2)(H2O)2](BF4)2 was determined by x-ray crystallography. The crystals are triclinic, P¯1, witha = 10.945(5),b = 8.703(5),c = 8.495(5) Å, = 103.86(3)°, = 105.73(3)°, = 85.77(3)°, V = 756 Å3 Dc = 1.65 g cm–3 for Z = 1. The copper(II) atoms are 5-coordinate and square-pyramidal. Selected bond distances are: Cu-N, 1.91 Å (mean); Cu-O(base) = 1.90(1) and 1.91(1) Å; Cu-O(apical) = 2.47(1) Å; There are O(water)-H ... F interionic hydrogen bonds in the structure. The Cu .. Cu distance is 2.847 Å. 相似文献
44.
The four stereomer 1-(4-hydroxy-3-methoxy)-phenyl-1,2,3-propanetriols were obtained in about 30% yields starting from ferulic acid by a synthesis based on osmium catalyzed asymmetric dihydroxylation. 相似文献
45.
Francesco Merola Simonetta Grilli Sara Coppola Veronica Vespini Sergio De Nicola Pasquale Maddalena Cosimo Carfagna Pietro Ferraro 《Advanced functional materials》2012,22(15):3267-3272
Investigation on the behavior of nematic liquid crystals on functionalized polar dielectric crystal substrates is accomplished. Very interesting effects can be observed in maneuvering liquid crystal droplets on the substrate surface, driven by electric fields generated by pyroelectric effect. Reversible drops fragmentation and self‐assembling in different configurations can be achieved. The dynamics of the observed phenomena is studied and the repeatability of the process is full assessed. 相似文献
46.
Roberta Seraglia Giovanni Sartore Raffaella Marin Silvia Burlina Enzo Manzato Eugenio Ragazzi Pietro Traldi Annunziata Lapolla 《Journal of mass spectrometry : JMS》2013,48(1):105-110
Increased oxidation of low density lipoprotein (LDL) is characteristic of atherosclerosis. In this frame, high density lipoproteins (HDL) play an important role, being able to remove lipid peroxides (LPOs) and cholesterol from oxidized LDL, so exhibiting a protective role against atherosclerosis. A wide range of reactive compounds lead to the oxidation of methionine (Met) residues with the formation of methionine sulphoxide (MetO) in apolipoprotein A‐I (ApoA‐I). Consequently, the determination of MetO level can give both an evaluation of oxidative stress and the reduced capability of ApoA‐I in LPOs and cholesterol transport. For these reasons, the development of analytical methods able to determine the MetO level is surely of interest, and we report here the results obtained by MALDI mass spectrometry. Copyright © 2013 John Wiley & Sons, Ltd. 相似文献
47.
48.
49.
50.