全文获取类型
收费全文 | 1371篇 |
免费 | 50篇 |
国内免费 | 5篇 |
专业分类
化学 | 887篇 |
晶体学 | 16篇 |
力学 | 37篇 |
数学 | 183篇 |
物理学 | 303篇 |
出版年
2023年 | 35篇 |
2022年 | 21篇 |
2021年 | 45篇 |
2020年 | 43篇 |
2019年 | 43篇 |
2018年 | 41篇 |
2017年 | 20篇 |
2016年 | 44篇 |
2015年 | 47篇 |
2014年 | 42篇 |
2013年 | 74篇 |
2012年 | 75篇 |
2011年 | 118篇 |
2010年 | 44篇 |
2009年 | 54篇 |
2008年 | 73篇 |
2007年 | 67篇 |
2006年 | 56篇 |
2005年 | 45篇 |
2004年 | 49篇 |
2003年 | 27篇 |
2002年 | 26篇 |
2001年 | 16篇 |
2000年 | 19篇 |
1999年 | 9篇 |
1998年 | 9篇 |
1997年 | 15篇 |
1996年 | 13篇 |
1995年 | 8篇 |
1994年 | 8篇 |
1993年 | 19篇 |
1992年 | 5篇 |
1991年 | 13篇 |
1990年 | 10篇 |
1989年 | 5篇 |
1988年 | 10篇 |
1987年 | 12篇 |
1986年 | 8篇 |
1985年 | 9篇 |
1984年 | 14篇 |
1983年 | 9篇 |
1982年 | 8篇 |
1981年 | 9篇 |
1980年 | 8篇 |
1979年 | 9篇 |
1978年 | 11篇 |
1977年 | 8篇 |
1976年 | 8篇 |
1974年 | 5篇 |
1973年 | 6篇 |
排序方式: 共有1426条查询结果,搜索用时 296 毫秒
1.
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
2.
Archiv der Mathematik - In this paper, we establish a sharp integral inequality for n-dimensional closed spacelike submanifolds with constant scalar curvature immersed with parallel normalized mean... 相似文献
3.
Condeixa Lucas Dias Silva Pierry Moah Diego Farias Brenda Leiras Adriana 《Central European Journal of Operations Research》2022,30(3):921-940
Central European Journal of Operations Research - Societal awareness and legislation changes concerning sustainability have affected how organizations generate value for stakeholders, as well as... 相似文献
4.
Fernandes Joo Lucas Ribeiro e de Souza Altair Lcio de Faria Geraldo Lcio 《Journal of Thermal Analysis and Calorimetry》2022,147(12):6593-6603
Journal of Thermal Analysis and Calorimetry - The hot coil slump is a recurrent problem in the manufacturing process of medium and high equivalent carbon steel plates. Even with the success of the... 相似文献
5.
6.
7.
8.
Lisboa Thalles Pedrosa de Faria Lucas Vincius Alves Guilherme Figueira Matos Maria Auxiliadora Costa Matos Renato Camargo 《Journal of Solid State Electrochemistry》2021,25(8):2301-2308
Journal of Solid State Electrochemistry - This work describes a simple, rapid, and cost-effective method for fabrication of paper-based carbon electrode (US$ <0.01) using conductive ink... 相似文献
9.
Lucas Ueberricke Ioana Ciubotaru Farhad Ghalami Felix Mildner Dr. Frank Rominger Prof. Dr. Marcus Elstner Prof. Dr. Michael Mastalerz 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(50):11634-11642
Five di- and tetracyano-substituted pyrene-fused pyrazaacenes were synthesized and studied as potential electron acceptors in the solid state. Single crystals of all compounds were grown and the crystal packing studied by DFT calculations (transfer integrals and reorganization energies) to get insight into possible use for semiconducting charge transport. 相似文献