全文获取类型
收费全文 | 1514篇 |
免费 | 78篇 |
国内免费 | 47篇 |
专业分类
化学 | 1171篇 |
晶体学 | 1篇 |
力学 | 16篇 |
综合类 | 1篇 |
数学 | 116篇 |
物理学 | 334篇 |
出版年
2024年 | 23篇 |
2023年 | 49篇 |
2022年 | 84篇 |
2021年 | 45篇 |
2020年 | 28篇 |
2019年 | 23篇 |
2018年 | 16篇 |
2017年 | 15篇 |
2016年 | 15篇 |
2015年 | 22篇 |
2014年 | 45篇 |
2013年 | 29篇 |
2012年 | 116篇 |
2011年 | 155篇 |
2010年 | 51篇 |
2009年 | 41篇 |
2008年 | 104篇 |
2007年 | 128篇 |
2006年 | 145篇 |
2005年 | 99篇 |
2004年 | 40篇 |
2003年 | 35篇 |
2002年 | 55篇 |
2001年 | 45篇 |
2000年 | 48篇 |
1999年 | 48篇 |
1998年 | 36篇 |
1997年 | 1篇 |
1996年 | 14篇 |
1995年 | 9篇 |
1994年 | 11篇 |
1993年 | 19篇 |
1992年 | 14篇 |
1991年 | 12篇 |
1990年 | 10篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 4篇 |
排序方式: 共有1639条查询结果,搜索用时 12 毫秒
61.
62.
WU Yi CHU Yang ZHANG Yun-hui WU Dan GU Jing-kai 《高等学校化学研究》2007,23(4):408-411
A rapid,sensitive,and accurate method based on LC/MS/MS was developed and validated for the determination of domperidone in human plasma.Domperidone and internal standard,tramadol,were extracted from plasma with diethyl ether-dichloromethane(60∶40,volume ratio)and separated by reversed-phase HPLC with methanol-water-ammonia solution(80∶20∶0.2,volume ratio)as the mobile phase.Detection was carried out via multiple-reaction monitoring(MRM)on a Q-trapTM LC/MS/MS system(Q-trapTM).The assay result was linear over a concentration range of 0.1-30 ng/mL with a limit of quantitation(LOQ)of 0.1 ng/mL.The inter-and intra-day precision levels were within 7.52% and 12.9%,respectively,whereas the accuracy was within a range of 87.3%-114%.This method has been successfully applied to evaluate the pharmacokinetics of domperidone in Chinese healthy volunteers given an oral dose of 10 mg. 相似文献
63.
XI Hai-tao SUN Xiao-qiang CHEN Juan MENG Qi PAN Yi HU Hong-wen 《高等学校化学研究》2007,23(6):745-748
Introduction Although devices based on pseudorotaxanes,cantenanes,and rotaxanes are commercialized yet,several researches have been done on the applications of these donor-acceptor molecules[1-6].A promising area is the field of nanotechnology. 相似文献
64.
This paper deals with dynamics of a predator-prey model with Allee effect and herd behavior. We first study the stability of non-negative constant solutions for such system. We also establish the existence of Hopf bifurcation solutions for such predator-prey model. The stability and bifurcation direction of Hopf bifurcation solution in the case of spatial homogeneity are further discussed. At the same time, several examples are given by MATLAB. Finally, the numerical simulations of the system are carried out through MATLAB, which intuitively verifies and supplements the theoretical analysis results. 相似文献
65.
The local minimax method(LMM) proposed by Li and Zhou(2001, 2002) is an efficient method to solve nonlinear elliptic partial differential equations(PDEs) with certain variational structures for multiple solutions. The steepest descent direction and the Armijo-type step-size search rules are adopted in Li and Zhou(2002) and play a significant role in the performance and convergence analysis of traditional LMMs. In this paper, a new algorithm framework of the LMMs is established based on general d... 相似文献
66.
Bai-Zhuo Li Si-Qi Wu Jin-Jin Xiang Qin-Qing Zhu Yi Liu Chao Cao Guang-Han Cao 《中国科学:物理学 力学 天文学(英文版)》2023,(3):143-150
Quasi-one-dimensional(Q1D) Cr-based pnictide K2Cr3As3 exhibits superconductivity probably with spin-triplet pairing. It is of fundamental importance to explore the parent compound from which superconductivity emerges. Here we report the synthesis,crystal structure, physical properties, and density functional theory(DFT) calculations of(nearly) fully hydrogenized K2Cr3As3 H.It is found that the intercalation of hydrogen in K2<... 相似文献
67.
Liting Huang Yongfeng Lun Yuping Liu Liming Chen Bowen Li Shuqin Song Yi Wang 《Journal of Energy Chemistry》2023,(11):16-22
Colloidal synthesis of metal nanoclusters will inevitably lead to the blockage of catalytically active sites by organic ligands. Here, taking [Au25(PET)18]-(PET = 2-phenylethanethiol) nanocluster as a model catalyst, this work reports a feasible procedure to achieve the controllably partial removal of thiolate ligands from unsupported [Au25(PET)18]-nanoclusters with the preservation of the core structure. This procedure shortens the processi... 相似文献
68.
Jiaqian Ding Xian Jiang Caikang Wang Zhuoya Zhu Chang Xu Yi Zhou Xuan Wang Qicheng Liu Zhenyuan Liu Yawen Tang Jun Lin Gengtao Fu 《Journal of Energy Chemistry》2023,(11):510-517
Ru with Pt-like hydrogen bond strength,knockdown cost(~1/3 of Pt),and eximious stability is a competitive replacement for Pt-based catalysts towards the hydrogen evolution reaction(HER) in water splitting.The design of Ru-based catalysts via interface construction,crystal phase control,and specific light element doping to realize the impressive promotion of limited activity and stability remains challenging.Herein,we report the fabrication of Pd@RuP core-shell nanorods(NRs) via an epitaxial grow... 相似文献
69.
Chun-Lei Song Qiao-Tong He Zhongyi Zeng Jing-Yan Chen Tian Wen Yu-Xiao Huang Liu-Chun Zhuang Wei Yi Yue-Peng Cai Xu-Jia Hong 《Journal of Energy Chemistry》2023,(4):505-514
Lithium-sulfur batteries are severely restricted by low electronic conductivity of sulfur and Li2S, shuttle effect, and slow conversion reaction of lithium polysulfides(LiPSs). Herein, we report a facile and highyield strategy for synthesizing dual-core single-atom catalyst(ZnCoN4O2/CN) with atomically dispersed nitrogen/oxygen-coordinated Zn-Co sites on carbon nanosheets. Based on density functional theory(DFT)calculations and LiPSs conversion catalytic ability, ZnCoN... 相似文献
70.
Ting-Ting Wei Xu Liu Shao-Jie Yang Peng-Fei Wang Ting-Feng Yi 《Journal of Energy Chemistry》2023,(5):603-613
Fe-Mn based layer oxides cathode materials have attracted widespread attention as a potential candidate for sodium-ion batteries(SIBs) owing to the earth abundance, cost-effectiveness and acceptable specific capacity. However, the irreversible phase transition often brings rapid capacity decay, which seriously hinders the practical application in large-scale energy storage. Herein, we design a nickel-doped Na0.70Fe0.10Cu0.20Ni0.05Mn0.65O 相似文献