全文获取类型
收费全文 | 224768篇 |
免费 | 4448篇 |
国内免费 | 782篇 |
专业分类
化学 | 127108篇 |
晶体学 | 2748篇 |
力学 | 9305篇 |
综合类 | 8篇 |
数学 | 26622篇 |
物理学 | 64207篇 |
出版年
2021年 | 1734篇 |
2020年 | 1938篇 |
2019年 | 1937篇 |
2018年 | 2267篇 |
2017年 | 2095篇 |
2016年 | 4111篇 |
2015年 | 3505篇 |
2014年 | 4085篇 |
2013年 | 10992篇 |
2012年 | 10001篇 |
2011年 | 11711篇 |
2010年 | 7170篇 |
2009年 | 6995篇 |
2008年 | 10651篇 |
2007年 | 10596篇 |
2006年 | 9894篇 |
2005年 | 9291篇 |
2004年 | 8172篇 |
2003年 | 7003篇 |
2002年 | 6646篇 |
2001年 | 6965篇 |
2000年 | 5370篇 |
1999年 | 4065篇 |
1998年 | 3105篇 |
1997年 | 3045篇 |
1996年 | 3126篇 |
1995年 | 2651篇 |
1994年 | 2573篇 |
1993年 | 2485篇 |
1992年 | 2794篇 |
1991年 | 2656篇 |
1990年 | 2370篇 |
1989年 | 2327篇 |
1988年 | 2312篇 |
1987年 | 2225篇 |
1986年 | 2100篇 |
1985年 | 3153篇 |
1984年 | 3125篇 |
1983年 | 2457篇 |
1982年 | 2718篇 |
1981年 | 2575篇 |
1980年 | 2514篇 |
1979年 | 2431篇 |
1978年 | 2504篇 |
1977年 | 2402篇 |
1976年 | 2392篇 |
1975年 | 2363篇 |
1974年 | 2261篇 |
1973年 | 2329篇 |
1972年 | 1304篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
In this paper, we design a Branch and Bound algorithm based on interval arithmetic to address nonconvex robust optimization problems. This algorithm provides the exact global solution of such difficult problems arising in many real life applications. A code was developed in MatLab and was used to solve some robust nonconvex problems with few variables. This first numerical study shows the interest of this approach providing the global solution of such difficult robust nonconvex optimization problems.
相似文献12.
13.
Laguel Yassine Pillutla Krishna Malick Jérôme Harchaoui Zaid 《Set-Valued and Variational Analysis》2021,29(4):967-996
Set-Valued and Variational Analysis - R. Tyrell Rockafellar and his collaborators introduced, in a series of works, new regression modeling methods based on the notion of superquantile (or... 相似文献
14.
Nonlinear Dynamics - In this article, the authors simulate and study dark and bright soliton solutions of 1D and 2D regularized long wave (RLW) models. The RLW model occurred in various fields such... 相似文献
15.
16.
Dr. Joaquim Torra Dr. Felipe Viela Dr. Diego Megías Dr. Begoña Sot Prof. Cristina Flors 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(19):e202200026
CRANAD-2 is a fluorogenic curcumin derivative used for near-infrared detection and imaging in vivo of amyloid aggregates, which are involved in neurodegenerative diseases. We explore the performance of CRANAD-2 in two super-resolution imaging techniques, namely stimulated emission depletion (STED) and single-molecule localization microscopy (SMLM), with markedly different fluorophore requirements. By conveniently adapting the concentration of CRANAD-2, which transiently binds to amyloid fibrils, we show that it performs well in both techniques, achieving a resolution in the range of 45–55 nm. Correlation of SMLM with atomic force microscopy (AFM) validates the resolution of fine features in the reconstructed super-resolved image. The good performance and versatility of CRANAD-2 provides a powerful tool for near-infrared nanoscopic imaging of amyloids in vitro and in vivo. 相似文献
17.
18.
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
19.
20.
Paired single residue‐transposed Lys‐N and Lys‐C digestions for label‐free identification of N‐terminal and C‐terminal MS/MS peptide product ions: ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry and tandem mass spectrometry for peptide de novo sequencing
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)