全文获取类型
收费全文 | 303篇 |
免费 | 47篇 |
国内免费 | 46篇 |
专业分类
化学 | 216篇 |
晶体学 | 1篇 |
力学 | 1篇 |
综合类 | 2篇 |
数学 | 3篇 |
物理学 | 82篇 |
无线电 | 91篇 |
出版年
2023年 | 3篇 |
2022年 | 16篇 |
2021年 | 12篇 |
2020年 | 11篇 |
2019年 | 7篇 |
2018年 | 8篇 |
2017年 | 11篇 |
2016年 | 15篇 |
2015年 | 14篇 |
2014年 | 11篇 |
2013年 | 39篇 |
2012年 | 16篇 |
2011年 | 18篇 |
2010年 | 11篇 |
2009年 | 15篇 |
2008年 | 26篇 |
2007年 | 21篇 |
2006年 | 18篇 |
2005年 | 11篇 |
2004年 | 12篇 |
2003年 | 22篇 |
2002年 | 15篇 |
2001年 | 10篇 |
2000年 | 7篇 |
1999年 | 11篇 |
1998年 | 7篇 |
1997年 | 2篇 |
1996年 | 7篇 |
1995年 | 6篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有396条查询结果,搜索用时 15 毫秒
1.
Determination of electronic structure of ozone related geometry is the main subject in this research. The proposed electronic structure must satisfy the experimental geometry, explain the excellent oxidizing properties of ozone, and can also explain the capability of additional reaction with unsaturated hydrocarbons. The potential energy surface of singlet and triplet state of ozone has been studied in order to check the correctness of the proposed structure. The proposed electronic structure of ozone is capable of explaining the oxidizing behavior of ozone in visible wavelength (daylight) 430–700 nm. For comparison, the other proposed structure of ozone in literature such as Pauling, Linnett and Weinhold has also been discussed. The main method used in this research is well-known density functional procedure, B3LYP, which takes the electron correlation aspect into consideration. The polarization and diffused functions are included in the basis set, 6-311++G**. The obtained geometry is a bent and cumulated double bond with inter-bond angle 118.42° (1.39%), and bond length 1.256 Å (1.72%). The obtained results revealed that frontier orbital theory is a proper tool for explaining the addition reaction. 相似文献
2.
P. Cicman M. Francis J.D. Skalny S. Matejcik T.D. Märk 《Czechoslovak Journal of Physics》2003,53(3):181-190
The rate constant for dissociative electron attachment to ozone has been derived over the energy range from about 0 to 10 eV using recently measured and also corrected cross section data. The new rate constant data sets for two partial dissociative channels, as well as for the total dissociative electron attachment, are compared with previously reported values, and existing discrepancies are discussed. 相似文献
3.
4.
在H6TeO6/KOH水溶液中以臭氧为氧化剂,将二价铜化合物氧化成三价铜化合物,并获得一个新的三价铜化合物Ba4K[Cu(H2TeO6)2](OH)4.6H2O;描述了碱性溶液中“Cu(Ⅲ)/Cu(Ⅲ)”循环伏安图。对铜(Ⅲ)化合物,Na4H[H2TeO6)2].17H2O以及相应的铜(Ⅱ)配合物的电子光谱和Cu2pXPS进行了研究,给出了其配位场场强参数和Cu2PXPX的电子结合能。由于价态升高 相似文献
5.
Bromine Superoxide: Generation and Photoisomerization into Bromine Dioxide Flash pyrolysis of a gas mixture containing bromine, oxygen and argon yields bromine superoxide, which can be identified IR- and UV-spectroscopically after trapping the pyrolysate at 12 K. Matrix irradiation transfers bromine superoxide into bromine dioxide. The backreaction can be induced by changing the wavelength. Even at room temperature a detectable amount of bromine superoxide is formed upon preparing a mixture of gaseous bromine, oxygen and argon. 相似文献
6.
臭氧是大气中一种重要的微量气体, 是影响对流层与平流层大气运动的重要成分之一, 臭氧的高精度探测
对于环境和气候具有重要的意义。OMI 传感器是目前具备探测全球臭氧含量的主要遥感传感器之一。利用地基
Pandora 观测网全球范围内44 个臭氧观测站点数据对OMI 卫星数据产品进行了精度验证。结果表明: OMI 臭氧产品
与Pandora 地基测量结果之间具有很好的线性相关性, 相关系数达到0.948, 但精度结果存在区域差异。在南半球地区,
相关系数为0.915; 在北半球低纬度地区, 其相关系数为0.932, 中纬度地区相关系数为0.948, 而在高纬度地区, 相关系
数达到了0.957。此外, 验证精度还与臭氧柱总量存在相关性, 在臭氧柱总量低于220 Du (对应臭氧空洞条件) 时, OMI
卫星产品存在高估现象, 高估约13%; 而在臭氧柱总量高于400 Du 时, OMI 的臭氧产品低于Pandora 地基测量结果, 且
随着臭氧柱总量增加, 低估情况也越严重, 在臭氧柱总量达到500 Du 时, OMI 臭氧产品低估约4%。 相似文献
7.
Error of DIAL-measured Ozone Concentration and a Three-Wavelength Inversion Technique 总被引:1,自引:0,他引:1
邱金桓 《中国科学B辑(英文版)》1993,(11)
Sensitivity of the error in the stratospheric ozone concentration measured by DIAL to the scattering property of the stratospheric aerosol is studied through both theoretical analysis and numerical experiment in this paper, and based on the sensitivity, a three-wavelength lidar inversion technique is proposed for a simultaneous determination of ozone concentration profile, aerosol backscatter coefficient profile and its size distribution in the stratosphere. It is found from the sensitivity study that there is a considerable effect of the stratospheric aerosol on accuracy of the ozone concentration solution. If the aerosol scattering is neglected, a large error of the solution can be obtained, especially when there is the stratospheric volcanic cloud, the error can be up to 100%. According to numerical experiments, a great improvement of the ozone concentration solution is obtained by using the present three-wavelenght inversion method. 相似文献
8.
L. Mariey J. Lamotte T. Chevreau J. C. Lavalley 《Reaction Kinetics and Catalysis Letters》1996,59(2):241-246
Two zeolites were coked using cyclohexene at 620 K; one had a low Si/Alf ratio (HY), the other was ultrastabilized (HYS). It was found that oxygen regeneration occurred at 770 K or above, whereas ozone was effective at 450 K or less,e.g. under conditions such that the HY sample was still thermally stable. 相似文献
9.
A design of a combined ozone/electron beam irradiation process for treating a 50 m3/h waste water stream from a molasses processing is discussed. Moreover, a cost evaluation of such a process in comparison to a conventional ozonation/biology treatment process has been performed to assess the potential of the irradiation process for technical use. Although the result of this comparison is not bad for the irradiation process an implementation into a full scale plant would not seem to be the thing to do in the present case. 相似文献
10.