全文获取类型
收费全文 | 34381篇 |
免费 | 4069篇 |
国内免费 | 1695篇 |
专业分类
化学 | 24116篇 |
晶体学 | 268篇 |
力学 | 1427篇 |
综合类 | 67篇 |
数学 | 4490篇 |
物理学 | 9777篇 |
出版年
2023年 | 532篇 |
2022年 | 624篇 |
2021年 | 836篇 |
2020年 | 985篇 |
2019年 | 989篇 |
2018年 | 921篇 |
2017年 | 772篇 |
2016年 | 1505篇 |
2015年 | 1370篇 |
2014年 | 1653篇 |
2013年 | 2543篇 |
2012年 | 2965篇 |
2011年 | 2932篇 |
2010年 | 1901篇 |
2009年 | 1626篇 |
2008年 | 2298篇 |
2007年 | 2048篇 |
2006年 | 1982篇 |
2005年 | 1692篇 |
2004年 | 1339篇 |
2003年 | 1044篇 |
2002年 | 974篇 |
2001年 | 560篇 |
2000年 | 511篇 |
1999年 | 530篇 |
1998年 | 399篇 |
1997年 | 393篇 |
1996年 | 433篇 |
1995年 | 350篇 |
1994年 | 293篇 |
1993年 | 327篇 |
1992年 | 233篇 |
1991年 | 226篇 |
1990年 | 204篇 |
1989年 | 163篇 |
1988年 | 140篇 |
1987年 | 123篇 |
1986年 | 142篇 |
1985年 | 160篇 |
1984年 | 143篇 |
1983年 | 83篇 |
1982年 | 105篇 |
1981年 | 104篇 |
1980年 | 114篇 |
1979年 | 82篇 |
1978年 | 88篇 |
1977年 | 64篇 |
1976年 | 87篇 |
1975年 | 51篇 |
1973年 | 50篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Tian Xiu-Zhi Yang Rui Ma Jia-Jia Ni Yong-Hao Deng Hai-Bo Dai Lei Tan Jiao-Jun Zhang Mei-Yun Jiang Xue 《高分子科学》2022,40(7):789-798
Chinese Journal of Polymer Science - Antistatic and strength properties are of vital importance for polyurethane rubber used in moving parts of many industrial instruments. Herein, polyurethane was... 相似文献
2.
Bazarra Noelia Castejón Alberto Fernández José R. Quintanilla Ramón 《Meccanica》2021,56(12):3025-3037
Meccanica - In this work we study, from the numerical point of view, a one-dimensional thermoelastic problem where the thermal law is of type III. Quasi-static microvoids are also assumed within... 相似文献
3.
4.
5.
Analysis Mathematica - We introduce and study the k-Hankel Gabor transform. We investigate the localization operators for this transform. In particular, we study their trace class properties and we... 相似文献
6.
Nonlinear Dynamics - This paper proposes an optimal parameter design of control scheme for mechanical systems by adopting the Stackelberg game theory. The goal of the control is to drive the... 相似文献
7.
Nonlinear Dynamics - The nonlinear modes of a non-conservative nonlinear system are sometimes referred to as damped nonlinear normal modes (dNNMs). Because of the non-conservative... 相似文献
8.
Science China Mathematics - Linear factor models are familiar tools used in many fields. Several pioneering literatures established foundational theoretical results of the quasi-maximum likelihood... 相似文献
9.
Tomáš Hložek Martin Štícha Miroslava Bursová Ivan Jelínek Petr Tůma Radomír Čabala 《Electrophoresis》2020,41(18-19):1564-1567
Riociguat is novel antihypertensive drug for treatment of pulmonary hypertension. As such, it is still being tested in many clinical and pharmacokinetic trials. Existing methods that determine serum riociguat and desmethylriociguat (DMR) are based solely on liquid chromatography with mass spectrometry. Therefore, we present a novel capillary electrophoresis with mass spectrometry method (CE-MS) for their determination in human serum as alternative method for ongoing trials. Complete resolution of both analytes was achieved by means of pH optimization of ammonium formate background electrolytes that are fully compatible with ESI/MS detection. Simple liquid-liquid extraction was used as sample pretreatment. The calibration dependence of the method was linear (in the range of 10–1000 ng/mL), with adequate accuracy (90.1–114.9%) and precision (13.4%). LOD and LOQ were arbitrarily set at 10 ng/mL for both analytes. Clinical applicability was validated using serum samples from patients treated with riociguat in pharmacokinetic study and the results corresponded with reference HPLC-MS/MS values. Capillary electrophoresis proved to be sensitive and selective tool for the analysis of riociguat and DMR. 相似文献
10.
The influence of different referencing methods on the accuracy of δ13C value measurement of ethanol fuel by gas chromatography/combustion/isotope ratio mass spectrometry
下载免费PDF全文
![点击此处可从《Rapid communications in mass spectrometry : RCM》网站下载免费的PDF全文](/ch/ext_images/free.gif)