全文获取类型
收费全文 | 46241篇 |
免费 | 735篇 |
国内免费 | 174篇 |
专业分类
化学 | 24581篇 |
晶体学 | 740篇 |
力学 | 1917篇 |
综合类 | 3篇 |
数学 | 4924篇 |
物理学 | 14985篇 |
出版年
2022年 | 441篇 |
2021年 | 654篇 |
2020年 | 516篇 |
2019年 | 524篇 |
2018年 | 716篇 |
2017年 | 632篇 |
2016年 | 1101篇 |
2015年 | 716篇 |
2014年 | 1059篇 |
2013年 | 2197篇 |
2012年 | 2162篇 |
2011年 | 2552篇 |
2010年 | 1848篇 |
2009年 | 1790篇 |
2008年 | 2138篇 |
2007年 | 2080篇 |
2006年 | 1859篇 |
2005年 | 1613篇 |
2004年 | 1503篇 |
2003年 | 1307篇 |
2002年 | 1189篇 |
2001年 | 1526篇 |
2000年 | 1126篇 |
1999年 | 913篇 |
1998年 | 710篇 |
1997年 | 656篇 |
1996年 | 608篇 |
1995年 | 547篇 |
1994年 | 510篇 |
1993年 | 460篇 |
1992年 | 531篇 |
1991年 | 526篇 |
1990年 | 510篇 |
1989年 | 465篇 |
1988年 | 485篇 |
1987年 | 467篇 |
1986年 | 406篇 |
1985年 | 498篇 |
1984年 | 520篇 |
1983年 | 373篇 |
1982年 | 416篇 |
1981年 | 402篇 |
1980年 | 360篇 |
1979年 | 423篇 |
1978年 | 409篇 |
1977年 | 411篇 |
1976年 | 416篇 |
1975年 | 367篇 |
1974年 | 340篇 |
1973年 | 358篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Chuprin A. S. Belova S. A. Bugaenko M. G. Vologzhanina A. V. Loktev A. S. Voloshin Ya. Z. Buznik V. M. Dedov A. G. 《Kinetics and Catalysis》2022,63(1):108-116
Kinetics and Catalysis - A new ruthenium(II) cage complex with polar terminal groups in the apical substituents has been synthesized; the molecular design of the complex contributes to the... 相似文献
2.
High Energy Chemistry - Modification of Polyvinylidene fluoride (PVDF) by radiation grafting is a research hotspot in recent years. In this study, the monomer 2-Hydroxyethyl methacrylate (HEMA) was... 相似文献
3.
4.
Alawainati F. A. Manaa H. Henari F. Z. Biyiklioglu Z. Arslan T. Jaafar A. 《Journal of Applied Spectroscopy》2021,88(5):951-957
Journal of Applied Spectroscopy - Detailed measurements of nonlinear optical properties and optical limiting for four phthalocyanine (Pc) derivatives (PcCo, PcCu, PcMn, and PcSi) are reported. The... 相似文献
5.
Siberian Mathematical Journal - A lattice homomorphism between quasi-Banach lattices is known to be compact if and only if it is a sum of a series of rank one lattice... 相似文献
6.
Corinne Rondeau-Mouro Mireille Cambert Laurent Blondel Yves Diascorn Léo Mbaya Nor Nadiah Binti Ahmad Nazari Sarah Helary Tiphaine Lucas 《Magnetic resonance in chemistry : MRC》2022,60(7):678-691
A temperature control unit was implemented to vary the temperature of samples studied on a commercial Mobile Universal Surface Explorer nuclear magnetic resonance (MOUSE-NMR) apparatus. The device was miniaturized to fit the maximum MOUSE sampling depth (25 mm). It was constituted by a sample holder sandwiched between two heat exchangers placed below and above the sample. Air was chosen as the fluid to control the temperature at the bottom of the sample, at the interface between the NMR probe and the sample holder, in order to gain space. The upper surface of the sample was regulated by the circulation of water inside a second heat exchanger placed above the sample holder. The feasibility of using such a device was demonstrated first on pure water and then on several samples of bread dough with different water contents. For this, T1 relaxation times were measured at various temperatures and depths and were then compared with those acquired with a conventional compact closed-magnet spectrometer. Discussion of results was based on biochemical transformations in bread dough (starch gelatinization and gluten heat denaturation). It was demonstrated that, within a certain water level range, and because of the low magnetic field strength of the MOUSE, a linear relationship could be established between T1 relaxation times and the local temperature in the dough sample. 相似文献
7.
8.
9.
10.
We study the full counting statistics of transport electrons through a semiconductor two-level quantum dot with Rashba spin–orbit (SO) coupling, which acts as a nonabelian gauge field and thus induces the electron transition between two levels along with the spin flip. By means of the quantum master equation approach, shot noise and skewness are obtained at finite temperature with two-body Coulomb interaction. We particularly demonstrate the crucial effect of SO coupling on the super-Poissonian fluctuation of transport electrons, in terms of which the SO coupling can be probed by the zero-frequency cumulants. While the charge currents are not sensitive to the SO coupling. 相似文献