全文获取类型
收费全文 | 400516篇 |
免费 | 4251篇 |
国内免费 | 1249篇 |
专业分类
化学 | 211315篇 |
晶体学 | 6896篇 |
力学 | 17688篇 |
综合类 | 12篇 |
数学 | 42889篇 |
物理学 | 127216篇 |
出版年
2020年 | 3251篇 |
2019年 | 3681篇 |
2018年 | 4571篇 |
2017年 | 4565篇 |
2016年 | 6825篇 |
2015年 | 4245篇 |
2014年 | 6915篇 |
2013年 | 17707篇 |
2012年 | 12936篇 |
2011年 | 15928篇 |
2010年 | 11309篇 |
2009年 | 11269篇 |
2008年 | 14552篇 |
2007年 | 14433篇 |
2006年 | 13610篇 |
2005年 | 12333篇 |
2004年 | 11315篇 |
2003年 | 10223篇 |
2002年 | 9994篇 |
2001年 | 12013篇 |
2000年 | 9166篇 |
1999年 | 7131篇 |
1998年 | 5817篇 |
1997年 | 5718篇 |
1996年 | 5471篇 |
1995年 | 5035篇 |
1994年 | 4895篇 |
1993年 | 4815篇 |
1992年 | 5532篇 |
1991年 | 5561篇 |
1990年 | 5312篇 |
1989年 | 5264篇 |
1988年 | 5326篇 |
1987年 | 5228篇 |
1986年 | 4946篇 |
1985年 | 6577篇 |
1984年 | 6782篇 |
1983年 | 5368篇 |
1982年 | 5636篇 |
1981年 | 5605篇 |
1980年 | 5310篇 |
1979年 | 5745篇 |
1978年 | 5820篇 |
1977年 | 5877篇 |
1976年 | 5765篇 |
1975年 | 5263篇 |
1974年 | 5286篇 |
1973年 | 5257篇 |
1972年 | 3679篇 |
1968年 | 3114篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
V. V. Sagaradze N. V. Kataeva V. A. Zavalishin K. A. Kozlov V. V. Makarov A. R. Kuznetsov 《哲学杂志》2020,100(14):1868-1879
ABSTRACT The authors present the results of an investigation in Fe–Ni-Cr austenitic alloys of the low-temperature deformation-induced segregations of nickel that form in the micro regions being (i) located close to grain- and subgrain boundaries and (ii) characteristic of the concentration and magnetic inhomogeneities indicated by the appearance of a dark diffraction contrast at the electron diffraction patterns taken from these regions typical (at the same time) of an enhanced value of Curie temperature. The observed effects were connected with the micro distortions caused by the local change of lattice parameter because of an increase in nickel concentration, as well as in the result of a magnetostriction dilatation. Using methods of the X-ray energy dispersive spectroscopy (XEDS) and atomic-probe body-section radiography (tomography – APT) has made it possible to determine the borders of those regions of austenite that were characteristic of an enhanced concentration of nickel in the fields of the localisation of a deformation-induced segregation of nickel in the vicinity of grain (subgrain) boundaries of austenitic alloys of the types Fe–13Cr–30Ni and Fe–37Ni–3Ti. 相似文献
72.
73.
74.
Mathematical Notes - 相似文献
75.
Algebras and Representation Theory - We introduce and study the category of twisted modules over a triangular differential graded bocs. We show that in this category idempotents split, that it... 相似文献
76.
Annals of Operations Research - The vehicle routing problem is a traditional combinatorial problem with practical relevance for a wide range of industries. In the literature, several specificities... 相似文献
77.
JETP Letters - One of the main features of the dusty plasma compared to the conventional plasma (without charged dust particles is anomalous dissipation that is caused by the charging of dust... 相似文献
78.
Kozetozhets I. V. Panasyuk G. P. Semenov E. A. Buzanov G. A. Avdeeva V. V. Danchevskaya M. N. Tsvetov N. S. Shapovalov S. S. Vasilev M. G. 《Russian Journal of General Chemistry》2022,91(1):S98-S105
Russian Journal of General Chemistry - Highly dispersed CaO has been synthesized by heating an aqueous solution of calcium nitrate and D-glucose up to 800°C. Calcium oxide is formed with an... 相似文献
79.
Acoustical Physics - The problem of pulsed excitation of an acoustic waveguide with a constant cross section is considered. Absorption is ignored. As the most general model of such a waveguide,... 相似文献
80.
Avramenko Andriy A. Shevchuk Igor V. Dmitrenko Nataliia P. Skitsko Ivan F. 《Journal of Thermal Analysis and Calorimetry》2022,147(22):12709-12719
Journal of Thermal Analysis and Calorimetry - The paper focuses on the analytical analysis of the propagation of a normal shock wave in an adiabatic gas flow with nanoparticles. A modified... 相似文献