全文获取类型
收费全文 | 117篇 |
免费 | 9篇 |
国内免费 | 4篇 |
专业分类
化学 | 37篇 |
晶体学 | 1篇 |
力学 | 2篇 |
综合类 | 1篇 |
数学 | 2篇 |
物理学 | 87篇 |
出版年
2023年 | 4篇 |
2022年 | 3篇 |
2021年 | 5篇 |
2019年 | 3篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2016年 | 3篇 |
2015年 | 5篇 |
2014年 | 4篇 |
2013年 | 1篇 |
2012年 | 4篇 |
2011年 | 4篇 |
2010年 | 1篇 |
2009年 | 1篇 |
2008年 | 4篇 |
2007年 | 6篇 |
2006年 | 4篇 |
2005年 | 4篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1999年 | 5篇 |
1998年 | 7篇 |
1997年 | 6篇 |
1996年 | 5篇 |
1995年 | 12篇 |
1994年 | 8篇 |
1993年 | 6篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 2篇 |
排序方式: 共有130条查询结果,搜索用时 31 毫秒
1.
2.
采用激发样品表层和样品中心两种激发方式,在300K和77K温度下研究叶绿素A(Chla)的较高激发行为,观测到峰值位于493、520和580nm三条新的荧光发射带.分别测量它们的荧光激发光谱,证明这三条新的荧光带属于Chla的第二激发单线态向基态的不同振动能级的辐射跃迁发光.最后提出电子跃迁模型,同时进行了讨论. 相似文献
3.
Eu^2+:BaFCl光激励发光过程中紫外线的激发与漂白效应 总被引:1,自引:1,他引:0
通过改变紫外线的辐射照能量范围,研究了Eu^2+:BaFCl的光激励发光性质。发现紫外线能量大于Eu^2+的最低激发态能量及紫外线的能量小于Eu^2+最低激发态的能量两种情况下,光激励发光具有明显的差异,分析了产生差异的原因,给出了紫外线的辐照能量发生转时所对应的能级位置。 相似文献
4.
5.
A stable inorganic-organic hybrid multilayer film with homogeneous and dense inorganic nanoparticle deposition was constructed by coating ZrO2 nanoparticles with poly(4-sodium styrenesulfonate) (PSS) and irradiating multilayer film assembled from PSS-coated ZrO2 nanoparticles and a diazo-resin (DR). 相似文献
6.
Schematic design of a complex thin-film luminescent screen usable for vacuum fluorescent and field emission display 总被引:2,自引:0,他引:2
Based on the facts related to solid-state cathodoluminescence, mixed excitation, and serial excitation recently discovered in our laboratory, a fundamental schematic design and a series of different schematic elaborated designs are proposed for protection from electron accumulation, reasonable use of a luminescent screen, and enhancement of light intensity. 相似文献
7.
The evolution of amorphous calcium carbonate (ACC) into crystals in ethanol/water binary solvents under ambient temperature was investigated, and it was found to depend on the volume ratio of ethanol to water (R). Calcite remained dominant when the amount of water was high (R = 1/3). A slight change in the amount of ethanol (R = 3/1) could lead to a dramatic change in the polymorph from calcite to aragonite. However, when poly (allylamine hydrochloride) (PAH) was added at R = 3/1, almost pure vaterite could be obtained, which has a specific morphological variation (from hollow microspheres to cloud‐like). This study provides an alternative polymorphic route for the CaCO3 mineral by using the evolution of ACC in different solvent environments, which provides some useful clues for understanding the importance of kinetic control of the morphologies and polymorphs of a wide range of inorganic materials. In addition, this simple mild phase‐controlled synthetic method could be scaled up as a green chemistry route for the industrial production of different polymorphs of CaCO3. 相似文献
8.
Guang Yan Suling Zhao Zheng Xu Fujun Zhang Chao Kong Liyan Gao Xurong Xu 《Physica B: Condensed Matter》2011,406(10):1845-1848
[6,6]-Phenyl C61 butyric acid methyl ester (PCBM) is used to modify an indium tin oxide (ITO)-coated substrate. Organic light-emitting diodes (OLEDs) using PCBM as the anode modification layer are fabricated. The dependence of performance on different PCBM thicknesses is also investigated. When the thickness of the PCBM film is appropriate, the brightness and efficiency of OLEDs are enhanced, which is attributed to an enhanced hole injection and an improved carrier balance. The enhancement of hole injection was ascribed to the formation of a dipole layer at the anode/organic interface. 相似文献
9.
Wei Xiong Xiaohong Zhao Genxing Zhu Changyu Shao Yaling Li Weimin Ma Xurong Xu Ruikang Tang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2015,127(41):12129-12133
Photobiological hydrogen production is of great importance because of its promise for generating clean renewable energy. In nature, green algae cannot produce hydrogen as a result of the extreme sensitivity of hydrogenase to oxygen. However, we find that silicification‐induced green algae aggregates can achieve sustainable photobiological hydrogen production even under natural aerobic conditions. The core–shell structure of the green algae aggregates creates a balance between photosynthetic electron generation and hydrogenase activity, thus allowing the production of hydrogen. This finding provides a viable pathway for the solar‐driven splitting of water into hydrogen and oxygen to develop green energy alternatives by using rationally designed cell–material complexes. 相似文献
10.