全文获取类型
收费全文 | 98765篇 |
免费 | 5718篇 |
国内免费 | 4628篇 |
专业分类
化学 | 56217篇 |
晶体学 | 1331篇 |
力学 | 5582篇 |
综合类 | 326篇 |
数学 | 11844篇 |
物理学 | 33811篇 |
出版年
2023年 | 749篇 |
2022年 | 1709篇 |
2021年 | 2054篇 |
2020年 | 2311篇 |
2019年 | 2507篇 |
2018年 | 2896篇 |
2017年 | 2823篇 |
2016年 | 3488篇 |
2015年 | 2412篇 |
2014年 | 3481篇 |
2013年 | 4917篇 |
2012年 | 5060篇 |
2011年 | 5362篇 |
2010年 | 4253篇 |
2009年 | 4258篇 |
2008年 | 4454篇 |
2007年 | 4174篇 |
2006年 | 3805篇 |
2005年 | 3375篇 |
2004年 | 3039篇 |
2003年 | 2712篇 |
2002年 | 2827篇 |
2001年 | 2547篇 |
2000年 | 1988篇 |
1999年 | 1601篇 |
1998年 | 1536篇 |
1997年 | 1329篇 |
1996年 | 1293篇 |
1995年 | 1077篇 |
1994年 | 1158篇 |
1993年 | 1098篇 |
1992年 | 1062篇 |
1991年 | 1124篇 |
1990年 | 1120篇 |
1989年 | 1040篇 |
1988年 | 917篇 |
1987年 | 914篇 |
1986年 | 881篇 |
1985年 | 921篇 |
1984年 | 915篇 |
1983年 | 822篇 |
1982年 | 800篇 |
1979年 | 801篇 |
1978年 | 812篇 |
1977年 | 806篇 |
1976年 | 919篇 |
1975年 | 812篇 |
1974年 | 844篇 |
1973年 | 847篇 |
1972年 | 752篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
Yu. F. Korobeinik 《Analysis Mathematica》2006,32(2):123-153
Summary Pust' Ej (j =1,2) - lokal'no vypuklye prostranstva funktsii, odnoznachnykh i lokal'no analiticheskikh na nekotorom mnozhestve Q ⊂ℂ. Pust', dalee, m(E1,E2) - mnozhestvo vsekh mul'tiplikatorov pary E1, E2 i L (E1, E2) sovokupnost' vsekh lineinykh operatorov, deistvuyushchikh iz E1 v E2. V stat'e e pri opredelennykh predpolozheniyakh poluchen kriterii predstavleniya operatora T iz L (E1, E2), kommutiruyushchego s fiksirovannym elementom a∊ m(E1,E1) ∩m(E2,E2), v kanonicheskoi forme Ty = b · y, gde b∊m(E1,E2). Obsuzhdayut·sya predpolozheniya, pri kotorykh poluchen kriterii, i privodyat·sya primery, pokazyvayushchie ikh sushchestvennost'. 相似文献
992.
We prove analogs of the Telyakovskii-Pochuev criteria for multipliers of uniform convergence and of convergence in the integral metric for multiplicative systems with bounded generating sequence. 相似文献
993.
Two novel dithienylethenes with ferrocene units were synthesized by Wittig reaction. The structure of 2a has been established by X‐ray diffraction studies. They could reversibly interconvert between two thermally stable forms, an open and a closed one, using light of different wavelengths as triggers. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
994.
A. A. Gavriliuk A. L. Semenov A. Yu. Mokhovikov D. V. Prudnikov D. A. Shiryaev 《Technical Physics》2006,51(6):746-751
The magnetic and magnetoelastic parameters of Fe64Co21B15 and Fe81.5B13.5Si3C2 amorphous ferromagnetic alloys treated by direct electric current in air are studied as functions of the applied magnetic field and current density. The samples of the alloy have the form of narrow strips with different lengths. It is found that the magnetoelastic parameters of the dc-treated alloys depend on the magnetic field in a qualitatively different way. From the behavior of the magnetic and magnetoelastic parameters of the alloys in the magnetic field a model of magnetization nonuniform distribution in amorphous ferromagnetic alloys subjected to dc treatment is proposed. 相似文献
995.
N. B. Ivanenko A. A. Ivanenko E. V. Molodkina E. B. Nosova A. E. Zeimal’ Yu. A. Zavoda 《Russian Journal of Applied Chemistry》2006,79(9):1546-1549
A direct (without sample pretreatment) atomic-absorption method of V and Ni determination in oil with electrothermal atomization and Zeeman correction of background was developed. 相似文献
996.
L. Yu. Novoselova E. E. Sirotkina E. V. Sergeeva 《Russian Journal of Applied Chemistry》2006,79(3):372-376
The possibility of raising the static exchange capacity of strongly acidic ion-exchange materials produced by grafting of styrene onto polypropylene fibers, with the subsequent sulfonation of the products synthesized, was analyzed. The chemical and osmotic stabilities of the sulfonic cation exchangers obtained and their frost resistance in freeze-thaw cycles were studied. 相似文献
997.
R. M. Vafina A. T. Gubaidullin O. N. Kataeva I. A. Litvinov Yu. G. Shtyrlin E. N. Klimovitskii 《Russian Journal of Organic Chemistry》2006,42(10):1563-1567
Conformationally heterogeneous 2-substituted 1,3-dithiacyclohept-5-enes (R = Ph, Me, t-Bu), which exist in solution as chair and boat conformers, react with dimethyl 1,2,4,5-tetrazine-3,6-dicarboxylate with high exo-diastereoselectivity: only the chair conformer is involved. The steric structure of 4-methyl-3,5-dithia-9,10-diazabicyclo[5.4.0]undeca-7,10-diene was determined by X-ray analysis. Its crystal packing and supramolecular structure were also analyzed. 相似文献
998.
S. A. Dieva R. M. Eliseenkova Yu. Ya. Efremov D. R. Sharafutdinova A. A. Bredikhin 《Russian Journal of Organic Chemistry》2006,42(1):12-16
Dioxirane generated in situ by reaction of chiral 1,2:4,5-di-O-isopropylidene-D-erythro-hexo-2,4-diulo-2,6-pyranose with Oxone oxidizes prochiral sulfides to the corresponding sulfoxides with an enantiomeric excess of 2 to 25%. 相似文献
999.
Yu.A. Danilov V.P. Lesnikov Yu.N. Nozdrin V.V. Podolskii M.V. Sapozhnikov O.V. Vikhrova B.N. Zvonkov 《Journal of magnetism and magnetic materials》2006
The properties of Mn-doped GaAs layers grown by laser deposition were investigated with measurements of Hall effect and magneto-optical Kerr effect (MOKE). The electrical and magnetic parameters of the layers were defined by growth temperature and quantity of sputtered Mn. It was shown that room-temperature ferromagnetism is revealed by MOKE and, after ruby laser 25 ns pulse annealing, by Hall effect measurements. 相似文献
1000.
Retraction: The following article from Biomedical Chromatography, “Determination of scutellarin isomer, a predominant metabolite of scutellarin, in human plasma by HPLC/tandem mass spectrometry and its application to the pharmacokinetic study in Chinese healthy volunteers” by Chun‐hua Xia, Yu‐qing Xiong, and Guang‐ji Wang, published online on 21 June 2007 in Wiley Interscience (www.interscience.wiley.com/journal/bmc), has been retracted at the authors' request. 相似文献