全文获取类型
收费全文 | 705篇 |
免费 | 79篇 |
国内免费 | 214篇 |
专业分类
化学 | 747篇 |
晶体学 | 10篇 |
力学 | 12篇 |
综合类 | 1篇 |
数学 | 2篇 |
物理学 | 226篇 |
出版年
2024年 | 6篇 |
2023年 | 10篇 |
2022年 | 19篇 |
2021年 | 24篇 |
2020年 | 28篇 |
2019年 | 22篇 |
2018年 | 16篇 |
2017年 | 25篇 |
2016年 | 28篇 |
2015年 | 23篇 |
2014年 | 29篇 |
2013年 | 53篇 |
2012年 | 44篇 |
2011年 | 42篇 |
2010年 | 26篇 |
2009年 | 58篇 |
2008年 | 61篇 |
2007年 | 77篇 |
2006年 | 62篇 |
2005年 | 59篇 |
2004年 | 36篇 |
2003年 | 50篇 |
2002年 | 35篇 |
2001年 | 32篇 |
2000年 | 32篇 |
1999年 | 23篇 |
1998年 | 18篇 |
1997年 | 13篇 |
1996年 | 12篇 |
1995年 | 13篇 |
1994年 | 6篇 |
1993年 | 2篇 |
1992年 | 4篇 |
1991年 | 4篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 3篇 |
排序方式: 共有998条查询结果,搜索用时 15 毫秒
91.
A silylated-terpyridine(Si TPy) derivative was newly synthesized and reacted with various transition metal ions in the solutions and self-assembled monolayers(SAMs).Composition and morphology of the SAMs were characterized by using absorption spectra,X-ray photoelectron spectra and atomic force microscope.The silylated-TPy compound gave off a luminescent emission at about 456 nm,which slightly shifted to 452 nm in the Zn2+-Si TPy and Fe2+-Si TPy metalated complexes.The absorbed energy can be further transferred to lanthanide ions(Tb3+and Eu3+) to give off the typical emissions of the lanthanide complexes together with an emission of the silylated-TPy at about 363 nm. 相似文献
92.
Surface dilational moduli of polymer monolayers, blended polymer monolayers, and polymer particle monolayers spread at air–water interfaces are reviewed, focusing on measurements using surface pressure isotherm, surface pressure relaxation, and oscillating barrier methods. Differences between the surface dilational moduli of condensed polymer monolayers and expanded polymer monolayers are explored. Moreover, the features of the surface dilational moduli in blended polymer monolayers are discussed in terms of their miscibility. 相似文献
93.
Koji YamamotoHiroki Sugiura Ryo AmemiyaHaruo Aikawa Zengjian AnMasahiko Yamaguchi Masashi Mizukami Kazue Kurihara 《Tetrahedron》2011,67(33):5972-5978
Optically active ethynylhelicene pentamers and hexamers linked by disulfide bonds were synthesized. They formed self-assembled monolayers (SAMs) with double helix structure on gold surfaces, which were analyzed by infrared reflection-absorption spectroscopy (IR-RAS), quartz crystal microbalance (QCM), surface plasmon resonance (SPR), and circular dichroism (CD). Double helix SAMs could be formed on gold surfaces either from double helices or random coils in solution. The double helices on the surface were more stable than in solution. This result suggested the presence of strong intercomplex interactions between double helix complexes on the surface. 相似文献
94.
95.
96.
金纳米粒子组装体系中偶联单分子层膜结构的SERS光谱表征与分析 总被引:2,自引:0,他引:2
通过分子自组装方法制备4,4′-二硫联吡啶(PySSPy)单分子膜修饰的金电极. 利用所形成的对巯基吡啶自组装单分子膜(SAMs)作为偶联层进行金纳米粒子有序膜的组装. 对该纳米粒子组装体系进行Raman光谱测定, 得到了具有良好信噪比的对巯基吡啶单分子膜的表面增强拉曼散射(SERS)光谱. 在此基础上, 进一步采用电化学现场SERS光谱技术研究了该纳米粒子组装体系的SERS光谱随电位变化的规律. 在该体系稳定的电位范围内表征对巯基吡啶单分子膜的特征谱峰1011与1093 cm-1、1575与1610 cm-1以及1206与1215 cm-1这三对谱峰其强度随着所施加电位的改变呈现出明显的规律性. 分析表明, 偶联单分子层中吡啶环芳香性随着所施加电位的改变而有规律地变化是SERS光谱特征改变的内在原因. 相似文献
97.
98.
The first non-equilibrium statistical mechanical theory is presented for the mechanical and thermal behaviour of the collapse of a microsropically small bubble in a liquid. First the number density and temperature space-time profiles for the special case of weakly interacting particles, the perfect gas model, are obtained. This is then generalized to a model in which the motion of the molecules is characterized by a single finite diffusion constant. The results for the collapse of a small bubble in a typical fluid are compared with those recently obtained through computer simulation. The agreement with the simulation is remarkably good for the perfect gas model; very high temperatures, sufficient for sonoluminescence, appear in a simple and natural way. An unexpected conclusion is that the perfect gas model agrees better with computer simulation than the model characterized by a single bulk diffusion constant. This may be because the collapse of the bubble is controlled by the leading shell of the fluid where the fluid density is low. 相似文献
99.
The theory of transmission fluctuation spectrometry (TFS) was recently developed for particle size analysis in dilute flowing particle suspensions, whereby the statistical transmission fluctuations are used to extract the particle size distribution and particle concentration. 相似文献
100.
Jianqi Shen Ulrich Riebel Xiaoai Guo 《Particle & Particle Systems Characterization》2005,22(5):320-328
The angular distribution of scattered light and the transmission of radiation through a monolayer of monodisperse spherical particles at variable particle concentration are studied. The scattering of light by a single particle is calculated with the classical Lorentz‐Mie theory. For a monolayer of mono‐dispersed spherical particles, if the monolayer density is less than 0.5 and the particle size parameter is larger than 5, effects from multiple scattering and dependent scattering can be excluded so that only steric interactions are considered. It is found that the scattering pattern, especially in the forward and backward directions, and the transmission are strongly dependent on the monolayer density. 相似文献