全文获取类型
收费全文 | 148篇 |
免费 | 7篇 |
国内免费 | 7篇 |
专业分类
化学 | 93篇 |
晶体学 | 1篇 |
力学 | 43篇 |
综合类 | 3篇 |
数学 | 7篇 |
物理学 | 15篇 |
出版年
2023年 | 1篇 |
2022年 | 5篇 |
2021年 | 1篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2017年 | 1篇 |
2016年 | 5篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 8篇 |
2012年 | 12篇 |
2011年 | 20篇 |
2010年 | 9篇 |
2009年 | 19篇 |
2008年 | 4篇 |
2007年 | 2篇 |
2006年 | 6篇 |
2005年 | 2篇 |
2004年 | 8篇 |
2003年 | 2篇 |
2001年 | 3篇 |
2000年 | 4篇 |
1999年 | 5篇 |
1998年 | 9篇 |
1997年 | 3篇 |
1996年 | 5篇 |
1995年 | 2篇 |
1994年 | 6篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1969年 | 1篇 |
1966年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有162条查询结果,搜索用时 31 毫秒
1.
用光电化学电流法研究了铅、铅砷、铅锑和铅铋合金在4.5mol·L-1H2SO4溶液(22℃)中,以0.9V(vs.Hg/Hg2SO4)极化7h而形成的阳极膜中的氧化铅的半导体性质,合金添加剂砷、锑和铋对t-PbO(四方氧化铝)和o-PbO(斜方氧化铝)的禁带宽度没有影响,从量子效率和电位的关系可求Pb,Pb-lat%As(at%表示原子百分比,全文同),Pb-lat%Sb和Sb-lat%Bi上膜中t-Pbo的施主密度(ND)分别为9.3×1015,1.0×1016,3.1×1016和1.3×1017cm-3,平带位分别为-0.20,-0.22,-0.28和-0.08V(vs.Hg/Hg2SO4).比较VA元素砷、锑和铋对上述膜中t-Pbo的ND(从而自由电子密度)和膜中t-Pbo的生长速率的影响,可认为法添加剂砷、锑和铋对阳极膜中t-Pbo的作用符合Hauffe规则. 相似文献
2.
以正庚烷的转化为探针反应 ,研究了添加元素锆对铂重整催化剂性能的影响规律。结果表明 ,在 4 50℃和连续流动条件下 ,Pt/γ -Al2 O3催化剂中引入锆不仅能够提高铂催化剂的稳定性和芳构化产率、抑制氢解和异构化 ,而且能使铂催化剂保持初活性。锆含量在 0 .56%左右 ,其调变作用最为显著。 相似文献
3.
Yuan Jun Zhang Chujun Chen Honggang Zhu Can Cheung Sin Hang Qiu Beibei Cai Fangfang Wei Qingya Liu Wei Yin Hang Zhang Rui Zhang Jidong Liu Ye Zhang Huotian Liu Weifang Peng Hongjian Yang Junliang Meng Lei Gao Feng So Shukong Li Yongfang Zou Yingping 《中国科学:化学(英文版)》2020,63(8):1159-1168
Recent advances in material design for organic solar cells(OSCs) are primarily focused on developing near-infrared nonfullerene acceptors, typically A-DA′D-A type acceptors(where A abbreviates an electron-withdrawing moiety and D, an electron-donor moiety), to achieve high external quantum efficiency while maintaining low voltage loss. However, the charge transport is still constrained by unfavorable molecular conformations, resulting in high energetic disorder and limiting the device performance. Here, a facile design strategy is reported by introducing the "wing"(alkyl chains) at the terminal of the DA′D central core of the A-DA′D-A type acceptor to achieve a favorable and ordered molecular orientation and therefore facilitate charge carrier transport. Benefitting from the reduced disorder, the electron mobilities could be significantly enhanced for the"wing"-containing molecules. By carefully changing the length of alkyl chains, the mobility of acceptor has been tuned to match with that of donor, leading to a minimized charge imbalance factor and a high fill factor(FF). We further provide useful design strategies for highly efficient OSCs with high FF. 相似文献
4.
Meccanica - Self-excited oscillation induced by the internal frictions of spline joints is a major cause of rotor system instability. In this study, the dynamic equations of spline-connected... 相似文献
5.
6.
7.
Jinxia Gua b Zhipeng Baib Weifang Lib Liping Wua Aixia Liuc Haiyan Dongd Yiyang Xiec a Tianjin Institute of Urban Construction Tianjin China b State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention Control College of Environmental Science Engineering Nankai University Tianjin China c Tianjin Institute of Meteorological Instruments Tianjin China d Tianjin Environmental Monitoring Central Station Tianjin China 《中国颗粒学报》2011,(3)
PM2.5 samples for 24 h were collected during winter in Tianjin,China. The ambient mass concentration and chemical composition of the PM2.5 were determined. Ionic species were analyzed by ion chromatog-raphy,while carbonaceous species were determined with the IMPROVE thermal optical reectance(TOR) method,and inorganic elements were measured by inductively coupled plasma-atomic emission spec-trometer. The daily PM2.5 mass concentrations ranged from 48.2 to 319.2 g/m3 with an arithmetic average of 144.6 g/m3. ... 相似文献
8.
A number of novel strobilurin analogues containing substituted N-phenylpyrimidin-2-amines were synthesized.The structures of these new compounds were confirmed by ~1H NMR,IR and elemental analysis.Biological evaluation in the greenhouse showed several compounds have good fungicidal activities at 25 mg/L. 相似文献
9.
The inversion of strong scatterer embedded in the half-space is an important problem in engineering and a very difficult nonlinear
problem in mathematics, for which the Born iterative method is of no effect. In this paper the moment method is used in the
discretization procedure. A numerical approach is presented by employing the regularization technique and DBI (distorted Born
iterative) method. The simulation results show that the approach presented is efficient.
Project supported by the Research Fund for the Doctoral Program of Higher Education (RFDP: 98048705). 相似文献
10.
In this paper,the synthesis and characterization of a triarylpyrazoline modified four-H-bonded molecular duplex are described. Its molecular structure has been confirmed by ~1H NMR and ESI-MS.The duplex emits strong pure blue light peaking at 448 and 452 nm under UV photoexcitation in solution and solid state,respectively,and its relative photoluminescence quantum efficiency in solution is determined as 0.778 using quinine sulfate as reference.In concentration of>40 mmol/L,the duplex can gelate DMSO, and... 相似文献