全文获取类型
收费全文 | 457篇 |
免费 | 25篇 |
国内免费 | 11篇 |
专业分类
化学 | 336篇 |
晶体学 | 6篇 |
力学 | 12篇 |
数学 | 15篇 |
物理学 | 124篇 |
出版年
2024年 | 4篇 |
2023年 | 11篇 |
2022年 | 20篇 |
2021年 | 33篇 |
2020年 | 27篇 |
2019年 | 15篇 |
2018年 | 21篇 |
2017年 | 20篇 |
2016年 | 35篇 |
2015年 | 20篇 |
2014年 | 12篇 |
2013年 | 43篇 |
2012年 | 39篇 |
2011年 | 31篇 |
2010年 | 23篇 |
2009年 | 26篇 |
2008年 | 16篇 |
2007年 | 17篇 |
2006年 | 8篇 |
2005年 | 8篇 |
2004年 | 4篇 |
2003年 | 4篇 |
2002年 | 6篇 |
2000年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 4篇 |
1994年 | 1篇 |
1991年 | 1篇 |
1989年 | 2篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1976年 | 6篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1969年 | 5篇 |
1968年 | 7篇 |
1967年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有493条查询结果,搜索用时 15 毫秒
491.
Shahid Farooq Muhammad Ijaz Khan Faris Alzahrani Aatef Hobiny 《Numerical Methods for Partial Differential Equations》2023,39(2):827-847
Current research models the Al2O3 47nm and Al2O3 36nm nanoparticles transportation through peristalsis with entropy optimization. Conservation laws for mass, momentum and energy are used to model the present flow situation. These equations elaborates the magnetohydrodynamics, Hall, thermal radiation, Joule heating, heat generation and absorption. Convective heat transfer impacts are studied at channel walls. Entropy is modeled in view of thermodynamics second law. Two different expressions for effective viscosity are accounted. Simplification of the modeled equations is done through lubrication assumptions. Solution for momentum equation is obtained analytically and for numerically for temperature equation. Built-in shooting procedure is utilized to obtain the desired numerical results. Later on these obtained results are used to sketch and discussed the flow quantities of interest for the influential parameters accounted in the problem. 相似文献
492.
Shahid Aziz Faheem Akhter Hidayat Hussain Jiguo Liu Huijiao Yan Li Cui Qixu Chen Wei Cheng Daijie Wang Xiao Wang 《Journal of separation science》2023,46(20):2300306
Bergenia ciliata (haw.) Sternb, the renowned pharmaceutical plant in Jammu and Kashmir of Pakistan, is widely applied in treating different illnesses including diabetes, diarrhea, and vomiting. This work employed an efficient one-step inner-recycling counter-current chromatography for preparative separating and purifying compounds with similar partition coefficients from the rhizome of Bergenia ciliate (haw.). Five compounds, including quercetin rhamnodiglucoside ( 1 ), quercetin-3-O-rutinoside ( 2 ), bergenine ( 3 ), kaempferol ( 4 ), and palmatic acid ( 5 ), were successfully separated using the optimized biphasic solvent system that contained ter-butylmetylether/n-butanol/acetonitrile/water (2:2:1:5, v/v) with the purities over 98%. Mass spectrometry and nuclear magnetic resonance were conducted for structural identification. As a result, our proposed strategy might be applied in separating compounds with similar partition coefficients, which was advantageous with regard to the less solvent and time consumption, and the increased number of theoretical plates. 相似文献
493.
Ullah Asad Zaman Shahid Hamraz Anila Muzammal Muniba 《The European physical journal. E, Soft matter》2023,46(8):1-8
The European Physical Journal E - In this article, we experimentally investigate the nonlinear behaviour of a viscoplastic film flow down an inclined plane. We focus on the nonlinear instabilities... 相似文献