全文获取类型
收费全文 | 1589篇 |
免费 | 353篇 |
国内免费 | 95篇 |
专业分类
化学 | 774篇 |
晶体学 | 29篇 |
力学 | 57篇 |
综合类 | 11篇 |
数学 | 341篇 |
物理学 | 825篇 |
出版年
2024年 | 5篇 |
2023年 | 22篇 |
2022年 | 54篇 |
2021年 | 63篇 |
2020年 | 63篇 |
2019年 | 71篇 |
2018年 | 49篇 |
2017年 | 69篇 |
2016年 | 93篇 |
2015年 | 57篇 |
2014年 | 114篇 |
2013年 | 216篇 |
2012年 | 103篇 |
2011年 | 103篇 |
2010年 | 92篇 |
2009年 | 79篇 |
2008年 | 89篇 |
2007年 | 68篇 |
2006年 | 79篇 |
2005年 | 54篇 |
2004年 | 57篇 |
2003年 | 67篇 |
2002年 | 46篇 |
2001年 | 39篇 |
2000年 | 38篇 |
1999年 | 23篇 |
1998年 | 31篇 |
1997年 | 22篇 |
1996年 | 30篇 |
1995年 | 18篇 |
1994年 | 22篇 |
1993年 | 14篇 |
1992年 | 11篇 |
1991年 | 5篇 |
1990年 | 9篇 |
1989年 | 5篇 |
1988年 | 10篇 |
1987年 | 5篇 |
1986年 | 9篇 |
1985年 | 5篇 |
1984年 | 7篇 |
1983年 | 1篇 |
1982年 | 9篇 |
1981年 | 2篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有2037条查询结果,搜索用时 0 毫秒
41.
42.
A new integrated scheme based on resource-reservation and adaptive network flow routing to alleviate contention in optical burst switching networks is proposed. The objective of the proposed scheme is to reduce the overall burst loss in the network and at the same time to avoid the packet out-of-sequence arrival problem. Simulations are carried out to assess the feasibility of the proposed scheme. Its performance is compared with that of contention resolution schemes based on conventional routing. Through extensive simulations, it is shown that the proposed scheme not only provides significantly better burst loss performance than the basic equal proportion and hop-length based traffic routing algorithms, but also is void of any packet re-orderings. 相似文献
43.
44.
45.
Hairan Zhang Qiuyue Zhang Ling Zhang Tingting Pei Erni Li Huiting Wang Prof. Qian Zhang Prof. Lixin Xia 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(6):1535-1542
Poly(N-isopropylacrylamide)-modified graphene oxide (PNIPAm-GO), which is a type of thermally responsive GO, was designed and synthesized through a covalent “grafting-from” strategy. The as-prepared modified nanosheets integrated the individual advantages of two components, such as the thermal sensitivity of the PNIPAm terminal as well as the conductivity and the open 2D structure of the GO substrate. PNIPAm-GO was able to perform the reversible regulation of hydrophilicity/hydrophobicity in aqueous solution upon variations in the temperature. Such a unique property might also lead to the utilization of PNIPAm-GO as an intelligent electrode material to achieve a switchable electrochemical response toward a [Fe(CN)6]3−/4− probe. The PNIPAm-GO modified glassy carbon electrode (PNIPAm-GO/GC electrode) was able to exhibit better electrochemical performance in an ON/OFF switching effect than the PNIPAm-modified glassy carbon electrode (PNIPAm/GC electrode) without GO owing to the intrinsic properties and large surface area of the introduced GO. Moreover, it was found that the PNIPAm-GO/GC electrode also displayed excellent thermally responsive electrocatalysis toward the detection of 1,4-dihydro-β-nicotinamide adenine dinucleotide (NADH) and dopamine (DA), which resulted in two different catalytic statuses on the same electrode. This kind of switchable catalytic performance of the PNIPAm-GO/GC electrode might greatly enhance the flexibility of its application, and thus it is expected to have wide potential for applications in the fields of biosensors and biocatalysis. 相似文献
46.
Yi Chen Deng-Gao Chen Yi-An Chen Cheng-Ham Wu Kai-Hsin Chang Fan-Yi Meng Meng-Chi Chen Jia-An Lin Chun-Ying Huang Jianhua Su He Tian Prof. Pi-Tai Chou 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(72):16755-16764
With the aim of generalizing the structure–properties relationship of bending heterocyclic molecules that undergo prominent photoinduced structural planarization (PISP), a series of new dihydrodibenzo[ac]phenazine derivatives in which one nitrogen atom is replaced by oxygen ( PNO ), sulfur ( PNS ), selenium ( PNSe ), or dimethylmethanediyl ( PNC ) was strategically designed and synthesized. Compounds PNO , PNS , and PNSe have significantly nonplanar geometries in the ground state, which undergo PISP to give a planarlike conformer and hence a large emission Stokes shift. A combination of femtosecond early relaxation dynamics and computational approaches established an R*→I* (intermediate)→P* sequential kinetic pattern for PNS and PNSe , whereas PNO undergoes R*→P* one-step kinetics. The polarization ability of the substituted heteroatoms, which is in the order O<S<Se, correlates with their increase in π conjugation, and hence the Stokes shift of the emission is in the order PNO < PNS < PNSe . Compound PNSe with the largest PISP barrier was shown to be a highly sensitive viscosity probe. Further evidence for heteroatom-harnessing PISP is given by PNC , in which the dimethylmethanediyl substituent lacks lone pair electrons for π extension, showing the normal emission of the bent structure. The results led to the conclusion that PISP is ubiquitous in dihydrodibenzo[ac]phenazines, for which the driving force is elongation of the π delocalization to gain stabilization in the excited state. 相似文献
47.
48.
A photoinduced decarboxylative three-component coupling reaction involving amine, maleic anhydride, and fluorinated alkyl iodides has been developed, leading to synthetically valuable fluoroalkyl-containing acrylamides with a high E selectivity. A broad array of substrates including monoprotected amino acid are capable coupling partners. Preliminary mechanistic studies suggest a stepwise process. This reaction represents the first example of photoinduced decarboxylative difunctionalization of maleic anhydride. 相似文献
49.
Ji Zhijian; Wang Long; Xie Guangming 《IMA Journal of Mathematical Control and Information》2005,22(4):441-452
** Corresponding author. Email: longwang{at}pku.edu.cn*** Email: jizj{at}mech.pku.edu.cn In this paper, the quadratic stabilization of switched linearsystems with polytopic uncertainties is considered. Comparedwith the existing result, a more general switching control methodis proposed to guarantee the quadratic stabilization. This switchingcontrol method is based on the partition of the vertex matrixset of each subsystem. By this method, the matrix inequalitiesneeded to be solved are always less than those needed to besolved before except one extreme case; for this case, it isequal. The switched control synthesis problem is also studiedfor both switched state feedback and output feedback. Severalbilinear matrix inequality based conditions are derived forboth cases. 相似文献
50.
一类混杂动态系统的能控性(I)——基本结果 总被引:3,自引:0,他引:3
首次将时滞现象引入到线性切换系统的模型中,研究含有时滞线性切换系统的能控性及其判定条件.全部工作由三部分组成,第I部分首先,提出含时滞的线性切换系统的数学模型,并介绍切换系统的基本概念——切换序列.其次,引入列空间、循环不变子空间和广义循环不变子空间等基本几何概念,给出一些有关概念的基本性质,特别是分离引理.然后以一个基本引理的形式揭式某一积分方程的解集与广义循环不变子空间之间的联系,这个引理将在能控性的判定中起关键作用.这些概念和引理都将作为以后展开能控性分析所必需的研究工具. 相似文献