全文获取类型
收费全文 | 57737篇 |
免费 | 733篇 |
国内免费 | 237篇 |
专业分类
化学 | 26682篇 |
晶体学 | 755篇 |
力学 | 3168篇 |
综合类 | 5篇 |
数学 | 4578篇 |
物理学 | 23519篇 |
出版年
2022年 | 421篇 |
2021年 | 416篇 |
2020年 | 446篇 |
2019年 | 422篇 |
2018年 | 557篇 |
2017年 | 487篇 |
2016年 | 868篇 |
2015年 | 609篇 |
2014年 | 969篇 |
2013年 | 2472篇 |
2012年 | 2309篇 |
2011年 | 2976篇 |
2010年 | 2100篇 |
2009年 | 2141篇 |
2008年 | 2731篇 |
2007年 | 2539篇 |
2006年 | 2433篇 |
2005年 | 2164篇 |
2004年 | 1954篇 |
2003年 | 1727篇 |
2002年 | 1561篇 |
2001年 | 2958篇 |
2000年 | 2058篇 |
1999年 | 1473篇 |
1998年 | 1017篇 |
1997年 | 983篇 |
1996年 | 795篇 |
1995年 | 753篇 |
1994年 | 698篇 |
1993年 | 604篇 |
1992年 | 938篇 |
1991年 | 933篇 |
1990年 | 837篇 |
1989年 | 738篇 |
1988年 | 729篇 |
1987年 | 794篇 |
1986年 | 647篇 |
1985年 | 874篇 |
1984年 | 823篇 |
1983年 | 559篇 |
1982年 | 560篇 |
1981年 | 532篇 |
1980年 | 495篇 |
1979年 | 619篇 |
1978年 | 644篇 |
1977年 | 659篇 |
1976年 | 573篇 |
1975年 | 482篇 |
1974年 | 521篇 |
1973年 | 450篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Stozhkov Y. I. Filippov M. V. Logachev V. I. Makhmutov V. S. 《Physics of Atomic Nuclei》2021,84(6):1007-1010
Physics of Atomic Nuclei - In the last two decades the new experimental data on cosmic rays concerning energy spectra in a wide energy range up to 10 $${}^{14}$$ eV, isotropy, ratio of positron... 相似文献
2.
M.Y. Pustylnik A.A. Pikalev A.V. Zobnin I.L. Semenov H.M. Thomas O.F. Petrov 《等离子体物理论文集》2021,61(10):e202100126
Low-pressure gas discharge plasmas are known to be strongly affected by the presence of small dust particles. This issue plays a role in the investigations of dust particle-forming plasmas, where the dust-induced instabilities may affect the properties of synthesized dust particles. Also, gas discharges with large amounts of microparticles are used in microgravity experiments, where strongly coupled subsystems of charged microparticles represent particle-resolved models of liquids and solids. In this field, deep understanding of dust–plasma interactions is required to construct the discharge configurations which would be able to model the desired generic condensed matter physics as well as, in the interpretation of experiments, to distinguish the plasma phenomena from the generic condensed matter physics phenomena. In this review, we address only physical aspects of dust–plasma interactions, that is, we always imply constant chemical composition of the plasma as well as constant size of the dust particles. We also restrict the review to two discharge types: dc discharge and capacitively coupled rf discharge. We describe the experimental methods used in the investigations of dust–plasma interactions and show the approaches to numerical modelling of the gas discharge plasmas with large amounts of dust. Starting from the basic physical principles governing the dust–plasma interactions, we discuss the state-of-the-art understanding of such complicated, discharge-type-specific phenomena as dust-induced stratification and transverse instability in a dc discharge or void formation and heartbeat instability in an rf discharge. 相似文献
3.
Kobayashi M. Zhang Y. Ishikawa H. Sun J. Oddershede J. Juul Jensen D. Miura H. 《Experimental Mechanics》2021,61(5):817-828
Experimental Mechanics - The internal strain distribution developing during plastic deformation is important for understanding the mechanical properties of polycrystalline materials. Such... 相似文献
4.
Physics of Atomic Nuclei - We have investigated the robustness of the spin-navigator based method for manipulating the beam polarization to bend magnet installation errors. Toward that end,... 相似文献
5.
Lebedev D. V. Egorov V. V. Shvetsov A. V. Zabrodskaya Y. A. Isaev-Ivanov V. V. Konevega A. L. 《Crystallography Reports》2021,66(2):242-253
Crystallography Reports - The review describes the application of small-angle scattering (SAS) of neutrons and complementary methods to study the structures of biomacromolecules. Here we cover SAS... 相似文献
6.
Russian Physics Journal - Connection of Pauli’s principle with the nontrivial structure of the fermion supertime is shown. When supersymmetry is localized as supergravitation, fields of... 相似文献
7.
8.
9.
Candle soot (CS) is a desirable carbon nanomaterial for sensors owing to its highly porous nanostructure and large specific surface area. CS is advantageous in its low-cost and facile preparation compared to graphene and carbon nanotubes, but its pristine nanostructure is susceptible to collapse, hampering its application in electronic devices. This article reports conformal coating of nanoscale crosslinked hydrophilic polymer on CS film using initiated chemical vapor deposition, which well preserved the CS nanostructure and obtained nanoporous CS@polymer composites. Tuning coating thickness enabled composites with different morphologies and specific surface areas. Surprisingly, the humidity sensor made from composite with the lowest filling degree, thus largest specific surface area, showed relatively low sensitivity, which is likely due to its discontinuous structure, thus insufficient conductive channels. Composite sensor with optimum filling degree shows excellent sensing response of more than 103 with the linearity of R2 = 0.9400 within a broad relative humidity range from 11% to 96%. The composite sensor also exhibits outstanding sensing performance compared to literature with low hysteresis (3.00%), a satisfactory response time (28.69 s), and a fast recovery time (0.19 s). The composite sensor is fairly stable and durable even after 24 h soaking in water. Furthermore, embedding a humidity sensor into a face mask realizes real-time monitoring of human breath and cough, suggesting promising applications in respiratory monitoring. 相似文献
10.
Manandhar Suman Sankhe Runali Priya Keerthi Hari Gangadhar Kumar B. Harish Mehta Chetan H. Nayak Usha Y. Pai K. Sreedhara Ranganath 《Molecular diversity》2022,26(5):2793-2811
Molecular Diversity - Wnt signaling pathway is an evolutionarily conserved pathway responsible for neurogenesis, axon outgrowth, neuronal polarity, synapse formation, and maintenance.... 相似文献