全文获取类型
收费全文 | 437篇 |
免费 | 56篇 |
国内免费 | 30篇 |
专业分类
化学 | 195篇 |
晶体学 | 6篇 |
力学 | 82篇 |
综合类 | 5篇 |
数学 | 42篇 |
物理学 | 193篇 |
出版年
2024年 | 2篇 |
2023年 | 5篇 |
2022年 | 14篇 |
2021年 | 11篇 |
2020年 | 20篇 |
2019年 | 15篇 |
2018年 | 15篇 |
2017年 | 16篇 |
2016年 | 15篇 |
2015年 | 23篇 |
2014年 | 19篇 |
2013年 | 20篇 |
2012年 | 27篇 |
2011年 | 28篇 |
2010年 | 24篇 |
2009年 | 22篇 |
2008年 | 22篇 |
2007年 | 21篇 |
2006年 | 21篇 |
2005年 | 23篇 |
2004年 | 10篇 |
2003年 | 6篇 |
2002年 | 4篇 |
2001年 | 4篇 |
2000年 | 3篇 |
1999年 | 10篇 |
1998年 | 7篇 |
1997年 | 8篇 |
1996年 | 16篇 |
1995年 | 30篇 |
1994年 | 22篇 |
1993年 | 13篇 |
1992年 | 3篇 |
1991年 | 6篇 |
1990年 | 4篇 |
1989年 | 5篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1983年 | 2篇 |
1969年 | 1篇 |
排序方式: 共有523条查询结果,搜索用时 31 毫秒
71.
根据薄膜干涉原理分析了迈克耳孙干涉仪实验中的等倾干涉现象,得到了接收屏上的光强分布与入射角的关系.采用计算机模拟的方法,用Matlab编写程序,运行后得到了迈克耳孙干涉仪等倾干涉环的图样. 相似文献
72.
Guocan Yu Tian‐Yong Cen Zhimei He Shu‐Ping Wang Zhantong Wang Xin‐Wen Ying Shijun Li Orit Jacobson Sheng Wang Lei Wang Li‐Sen Lin Rui Tian Zijian Zhou Qianqian Ni Xiaopeng Li Xiaoyuan Chen 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(26):8891-8895
Single molecular nanoparticles (SMNPs) integrating imaging and therapeutic capabilities exhibit unparalleled advantages in cancer theranostics, ranging from excellent biocompatibility, high stability, prolonged blood lifetime to abundant tumor accumulation. Herein, we synthesize a sophisticated porphyrin nanocage that is further functionalized with twelve polyethylene glycol arms to prepare SMNPs ( porSMNPs ). The porphyrin nanocage embedded in porSMNPs can be utilized as a theranostic platform. PET imaging allows dynamic observation of the bio‐distribution of porSMNPs , confirming their excellent circulation time and preferential accumulation at the tumor site, which is attributed to the enhanced permeability and retention effect. Moreover, the cage structure significantly promotes the photosensitizing effect of porSMNs by inhibiting the π–π stacking interactions of the photosensitizers, ablating of the tumors without relapse by taking advantage of photodynamic therapy. 相似文献
73.
Jun Xu Jiang Zhou Yao Yao Zhanhong Cen Fenqi Song Ling Xu Jianguo Wan Kunji Chen 《Solid State Communications》2008,145(9-10):443-446
Dense Si nano-dots with a surface area density of >1010 cm?2 were fabricated by excimer laser induced crystallization of 15 nm-thick amorphous Si thin films. The enhanced electron field emission characteristics were found from laser irradiated samples. The threshold electric field is as low as 9.8V/μm and the field enhancement factor can reach as large as 719, which is compatible with the other good cold cathode materials. The improvements in field emission behavior can be associated with the change in the surface morphology after laser irradiation as well as the enhanced internal electric field due to the formation of Si nano-dots within the films. 相似文献
74.
提出了一种利用电荷耦合器件摄像机获取的辐射信息进行二维弥散介质温度场快速重建的新模型. 与现有的温度场重建模型相比,该模型是以逆向Monte Carlo方法为基础,重建速度更快、效率更高,能更好地描述散射介质. 采用了一个精确的二维温度场作为重建对象,结果表明,即使在存在测量误差的情况下,利用此模型重建出的温度场仍能重现原有精确温度场的特征.
关键词:
温度场重建
逆向Monte Carlo
电荷耦合器件摄像机
反问题 相似文献
75.
76.
Cen Benqiang Li Kexun Lv Cuicui Yang Rui 《Journal of Solid State Electrochemistry》2020,24(3):687-697
Journal of Solid State Electrochemistry - In this work, we synthesized metal-organic framework Cu3(BTC)2 which was applied as the doping materials of anode electrodes in capacitive deionization... 相似文献
77.
Xiao-Gang Wu Wei-Lun Yu Hai-Peng Cen Yan-Qin Wang Yuan Guo Wei-Yi Chen 《Acta Mechanica Sinica》2015,31(1):112-121
A hierarchical model is developed to predict the streaming potential(SP) in the canaliculi of a loaded osteon. Canaliculi are assumed to run straight across the osteon annular cylinder wall, while disregarding the effect of lacuna. SP is generalized by the canalicular fluid flow. Analytical solutions are obtained for the canalicular fluid velocity, pressure, and SP. Results demonstrate that SP amplitude(SPA) is proportional to the pressure difference, strain amplitude, frequency, and strain rate amplitude. However, the key loading factor governing SP is the strain rate, which is a representative loading parameter under the specific physiological state. Moreover, SPA is independent of canalicular length. This model links external loads to the canalicular fluid pressure, velocity, and SP, which can facilitate further understanding of the mechanotransduction and electromechanotransduction mechanisms of bones. 相似文献
78.
Liu‐Cheng Gui Fa‐Si Li Zhong‐Min Cen Xiu‐Jian Wang Bin Li 《Acta Crystallographica. Section C, Structural Chemistry》2008,64(11):m378-m380
The title compound, poly[chlorido[μ4‐2,2′‐(2‐methylbenzimidazolium‐1,3‐diyl)diacetato]cadmium(II)], [Cd(C12H11N2O4)Cl]n, is an undulating two‐dimensional polymer consisting of a paddlewheel Cd2(CO2)4 cluster which lies on an inversion centre. These paddlewheel clusters act as four‐connected square building units interlinked via bridging zwitterionic dicarboxylate ligands into a corrugated layer which is consolidated by π–π interactions between benzene rings of benzimidazole groups. Neighbouring layers are further assembled via interlayer π–π interactions into a three‐dimensional supramolecular structure. The key feature of this study is the synthesis of a paddlewheel‐based polymer constructed with a novel multifunctional zwitterionic dicarboxylate ligand. 相似文献
79.
Huaping Xu Xiaoyu Kong Mengjie Cen Prof. Dr. Ze-Feng Xu Prof. Dr. Shengguo Duan Prof. Dr. Chuan-Ying Li 《European journal of organic chemistry》2023,26(8):e202201417
Cyclopropane, dihydropyrrole, and azepane ring systems were synthesized conveniently from sulfinate-tethered triazoles. The divergent synthetic strategy started with the unique 1,3-sulfinate migration of an α-imino carbene. The efficient reaction allowed control of the zwitterion bearing multiple reactive sites depending on the increased stability of the resulting carbocation and anion. The sulfinate was converted to a sulfone after the group migration, and a stable anion bearing two electron-withdrawing groups was thus formed. Catalytic amounts of iodide acted as a switch for the synthesis of cyclopropanes and dihydropyrroles. The reaction merits including readily available substrates, mild reaction conditions, and excellent functional group compatibility qualified this protocol a possible synthetic tool for cyclic compounds, especially for N-heterocycles. 相似文献
80.
In this paper a singularly perturbed Riccati equation is considered. The problem is solved by using a hybrid finite difference method on a Shishkin mesh. The method is composed of the midpoint upwind scheme and the backward Euler scheme based on the relation between the local mesh width and the perturbation parameter. It is proved that the scheme is almost second-order convergent, in the global maximum norm, independently of the singular perturbation parameter. Numerical experiments support the theoretical results. 相似文献