全文获取类型
收费全文 | 5537篇 |
免费 | 134篇 |
国内免费 | 15篇 |
专业分类
化学 | 2921篇 |
晶体学 | 121篇 |
力学 | 255篇 |
数学 | 746篇 |
物理学 | 1643篇 |
出版年
2022年 | 53篇 |
2021年 | 88篇 |
2020年 | 93篇 |
2019年 | 107篇 |
2018年 | 76篇 |
2017年 | 103篇 |
2016年 | 150篇 |
2015年 | 117篇 |
2014年 | 155篇 |
2013年 | 405篇 |
2012年 | 272篇 |
2011年 | 307篇 |
2010年 | 193篇 |
2009年 | 173篇 |
2008年 | 229篇 |
2007年 | 248篇 |
2006年 | 198篇 |
2005年 | 200篇 |
2004年 | 167篇 |
2003年 | 119篇 |
2002年 | 108篇 |
2001年 | 72篇 |
2000年 | 56篇 |
1999年 | 61篇 |
1998年 | 56篇 |
1997年 | 35篇 |
1996年 | 58篇 |
1995年 | 57篇 |
1994年 | 65篇 |
1993年 | 76篇 |
1992年 | 71篇 |
1991年 | 51篇 |
1990年 | 64篇 |
1989年 | 58篇 |
1988年 | 60篇 |
1987年 | 51篇 |
1985年 | 81篇 |
1984年 | 99篇 |
1983年 | 58篇 |
1982年 | 71篇 |
1981年 | 71篇 |
1980年 | 76篇 |
1979年 | 77篇 |
1978年 | 71篇 |
1977年 | 68篇 |
1976年 | 61篇 |
1975年 | 46篇 |
1974年 | 52篇 |
1973年 | 55篇 |
1972年 | 35篇 |
排序方式: 共有5686条查询结果,搜索用时 15 毫秒
31.
Raj Gandhi Kamales Kar S. Uma Sankar Abhijit Bandyopadhyay Rahul Basu Pijushpani Bhattacharjee Biswajoy Brahmachari Debrupa Chakraborti M. Chaudhury J. Chaudhury Sandhya Choubey E. J. Chun Atri Desmukhya Anindya Datta Gautam Dutta Sukanta Dutta Anjan Giri Sourendu Gupta Srubabati Goswami Namit Mahajan H. S. Mani A. Mukherjee Biswarup Mukhopadhyaya S. N. Nayak M. Randhawa Subhendu Rakshit Asim K. Ray Amitava Raychaudhuri D. P. Roy Probir Roy Suryadeep Roy Shiv Sethi G. Sigl Arunansu Sil N. Nimai Singh Mark Vagins Urjit Yagnik 《Pramana》2003,60(2):405-409
This is the report of neutrino and astroparticle physics working group at WHEPP-7. Discussions and work on CP violation in
long baseline neutrino experiments, ultra high energy neutrinos, supernova neutrinos and water Cerenkov detectors are discussed. 相似文献
32.
33.
Kishore K Tiwari Girdhar L Mundhara Manish K Rai Vinay K Gupta 《Analytical sciences》2006,22(2):259-262
The results of a study and application of leucocrystal violet for the determination of antimony in parts per million levels is described here. The proposed method is based on the reaction of antimony(III) with acidified potassium iodate to liberate iodine. The liberated iodine selectively oxidizes leucocrystal violet to crystal violet dye. The formed dye shows maximum absorbance at 590 nm. The color system obeys Beer's law in the concentration range from 0.4 - 3.6 microg antimony per 25 ml of final solution. The molar absorptivity and Sandell's sensitivity were found to be 7.32 x 10(5) l mol(-1) cm(-1) and 0.0016 microg cm(-2), respectively. All variables were studied in order to optimize the reaction. The proposed method is satisfactorily applicable for the analysis of antimony in various environmental and biological samples. The method is simple, highly sensitive, accurate and reliable. 相似文献
34.
Josephson effects have been observed in bulk samples of Y-Ba-Cu-O. The magnitude of the zero-voltage current is found to change
systematically with externally applied small magnetic fields of a few mG. It is also found to vary when samples are irradiated
with microwaves. These observations suggest the presence of inter-grain Josephson junctions. 相似文献
35.
Summary Analysis of the in plane lateral collapse of square and rectangular cross-section tubes is presented by considering the out-of-straightness of horizontal and vertical arms, corner radius, friction between the platens and the deforming specimen and instability of vertical arms. Results of collapse load for tubes of aluminium and mild steel, thus computed, are presented for some typical tube geometrics, and influence thereon of various parameters considered is discussed. Experiments were conducted wherein tubes of square and rectangular cross-sections of both the materials were laterally compressed between two parallel platens in an Instron machine. The observed collapse loads compare very well with the corresponding computed values.
Kollaps von vertikal belasteten Rohren mit quadratischem und rechteckigem Querschmitt
Übersicht Der Kollaps von Rohren mit quadratischem und rechteckigem Querschnitt, welche senkrecht zur Achse belastet werden, wird untersucht, wobei schiefe Vertikal- und Horizontalstege, gerundete Profilecken, Reibung zwischen Belastungsplatten und Rohr sowie die Stabilität der Vertikalstege brücksichtigt werden. Die Kollapslast wird für Aluminium und Weichstahl und einige typische Rohrgeometrien ermittelt und der Einfluß verschiedener Parameter wird untersucht. Die Experimente wurden auf einer Instron-Maschine durchgeführt, wobei Rohre mit quadratischem und rechteckigem Querschnitt aus beiden Werkstoffen zwischen zwei parallelen Platten quer zur Achse komprimiert wurden. Es konnte eine gute Übereinstimmung zwischen den Resultaten aus Experiment und Rechnung festgestellt werden.相似文献
36.
G. Date T. R. Govindarajan P. Sankaran R. Shankar 《Communications in Mathematical Physics》1990,132(2):293-313
We compute the homotopy groups
0 and
1 of the classical configuration space of anO(3) invariant field theory on
×, where
is a compact two dimensional manifold for arbitrary genusg and- denotes the time coordinate. We also present the finite dimensional, unitary, irreducible, inequivalent representations of the appropriate fundamental groups and comment on some of their implications. 相似文献
37.
38.
39.
Adamovich MI Aggarwal MM Alexandrov YA Ameeva ZV Andreeva NP Anzon ZV Arora R Badyal SK Bhalla KB Bhasin A Bhatia VS Bubnov VI Burnett TH Cai X Chasnikov IY Chernova LP Chernyavski MM Dressel B Eligbaeva GZ Eremenko LE Friedlander EM Gadzhieva SI Gaitinov AS Ganssauge ER Garpman S Gerassimov SG Gill A Grote JG Gulamov KG Gulyamov UG Gupta VK Hackel S Heckman HH Haung H Judek B Kachroo S Kadyrov FG Kalyachkina GS Kanygina EK Kaul GL Kaur M Kharlamov SP Koss T Kumar V Lal P Larionova VG 《Physical review letters》1990,65(4):412-415
40.
Stewart C Zieminski A Blessing S Crittenden R Draper P Dzierba A Heinz R Krider J Marshall T Martin J Sambamurti A Smith P Sulanke T Gomez R Dauwe L Haggerty H Malamud E Nikolic M Hagopian S Abrams R Ares J Goldberg H Halliwell C Margulies S McLeod D Salminen A Solomon J Wu G Ellsworth R Goodman J Gupta S Yodh G Watts T Abramov V Antipov Y Baldin B Denisov S Glebov V Gorin Y Kryshkin V Petrukhin A Polovnikov S Sulyaev R 《Physical review D: Particles and fields》1990,42(5):1385-1395