排序方式: 共有59条查询结果,搜索用时 218 毫秒
41.
Takashi Ogi Ferry Iskandar Yoshifumi Itoh Kikuo Okuyama 《Journal of nanoparticle research》2006,8(3-4):343-350
In2O3:Sn (Indium Tin Oxide; ITO) films were prepared from a sol solution with highly crystalline ITO nanoparticles (less than 20 nm in size with 10 at.% Sn) which had been prepared by low-pressure spray pyrolysis (LPSP) in a single step. The ITO sol solution was prepared by dispersing LPSP-prepared ITO nanoparticles into ultra pure water. The nanoparticle ITO film was deposited on a glass substrate using a dip-coating method and then annealed in air at various temperatures. The optical transmittances of the ITO films were measured by UV–Vis spectrometry, and the films were found to have a high transparency to visible light (in the case of a film thickness of 250 nm annealed at 400°C, the transparency was in excess of 95% over the range λ=450–800 nm, with a maximum value near 100% at wavelengths above λ=700 nm). The optical transmittances of the films were influenced by the size of the ITO particle used, the film thickness and the annealing temperature. The ITO films showed a minimum resistivity of 9.5×10−2 Ω cm, and their resistivity was affected by both the ITO particle size and the annealing temperature used. 相似文献
42.
Iskandar Ferry Lenggoro I. Wuled Xia Bin Okuyama Kikuo 《Journal of nanoparticle research》2001,3(4):263-270
The preparation of silica powders derived from sols with a variety of primary particle sizes from 4 to 100 nm and the influences of preparation conditions such as drying temperature and initial concentration of precursor on the final powders morphology were investigated for the first time. The prepared silica powders have spherical morphology, and the final diameter (between 0.1 and 2 um) was controlled by changing the concentration of starting colloidal suspension. The preparation of silica based luminescent powders was investigated by adding europium ion as the dopant. The Eu-doped silica powders showed a visible-luminescence with wavelength of 613 nm, a red emission, under excitation of 394 nm light source. The effects of Eu-doping concentration, operation temperature and primary particle size of silica sols on the luminescence were also investigated. 相似文献
43.
Zerrouki A. Allouchi H. Nicolaï B. El Kadiri S. Bahari Z. Céolin R. Rietveld I. B. 《Structural chemistry》2016,27(2):697-704
Structural Chemistry - The crystal structure of N,N,N′,N′-tetrakis-[(1H,2,4-triazol-1-yl)methyl]-ethane-1,2-diamine has been fully determined at six different temperatures by X-ray... 相似文献
44.
Reza Zamiri Avito Rebelo Hamid Reza Bahari Poor J. M. F. Ferreira 《Applied Physics A: Materials Science & Processing》2014,117(4):2289-2294
ZnO nanoplates with Er-doping concentrations varying in the range from 3 to 7 wt% and co-doped with (Er–Yb) (7 + 7 wt%) were successfully prepared by wet chemical precipitation method. The effects of doping on the structural and optical properties of ZnO nanostructures have been systematically investigated. The structural morphology of the prepared nanostructures was found to change with increasing Er-doping concentrations. The visible photoluminescence and infrared photoluminescence of the prepared nanostructures were measured at room temperature. The intensity of visible emission spectra was found to increase with increasing Er-doping concentrations and was further enhanced for (Er–Yb) co-doped ZnO nanoplate samples. Additionally, Er-doped (7 wt%) and Yb-doped (7 wt%) ZnO nanoplates showed an enhanced emission peak at 950 nm, whereas two enhanced emission peaks at 950 and 980 nm have been found for (Er–Yb)-co-doped (7 + 7 wt%) ZnO nanoplates samples when excited at 310, 365 and 371 nm excitation wavelengths. 相似文献
45.
We present a unified model based on the gauge group SU(2)L × (T3)R × UV(1) which successfully reproduces all the neutrino and electron-deuterium scattering data, the y-dependence of the latter, and still permits a range of values for QW measured in atomic physics. 相似文献
46.
Alan Roy Katritzky Nicholas E. Grzeskowiak Hector J. Salgado Zakaria bin Bahari 《Tetrahedron letters》1980,21(46):4451-4454
The title pyridones form products in which either their own carbanion, or an alkylcarbanion, has added to the 3-position, followed by an electrophile to the 4-position. 相似文献
47.
The combined approach of linearization and splitting up is used for devising new algorithms to solve a one-dimensional Burgers' equation. Two schemes are discussed and the computed solutions are compared with the exact solution. For this problem it is found that the schemes proposed yield excellent numerical results for Reynolds number R ranges from 50 up to 1500. The schemes were also tested for another problem whose R = 10000. In this case a filtering technique is used to overcome the nonlinear instability. 相似文献
48.
The combined approach of linearisation and finite difference method is used to solve the improved Boussinesq equation. A three-level iterative scheme having second order accuracy and constant coefficients matrix is devised and used in discussing the dynamics of waves having various initial wave packets. The results are in good agreement with the available results. 相似文献
49.
The de Sitter solution to the positive cosmological Einstein field equation has been viewed as a one-sheeted hyperboloid embedded
in a five dimensional Minkowski space. To find Lagrangian equation of supersymmetry-group in the de Sitter space, the different
spinor field’s quantization have been demonstrated. In this work, the first quantization of spin
field in the time-space de Sitter universe with ambient space notation has been done. 相似文献
50.
Ali Bahari Fereshteh Rahimi Moghadam 《Physica E: Low-dimensional Systems and Nanostructures》2012,44(4):782-785
The third order nonlinearity susceptibility is obtained as a function of wavelength for CdSe-ZnS-CdSe structure. Numerical calculations show that the quadratic electro-optic and electro absorption effects of this structure depend on the parameters such as structure size, relaxation time and pump photon energy. By changing shells thickness, these structures can be designed with the susceptibility peak from the visible to infrared regions of the spectrum. The intensity and position of the third order nonlinearity susceptibility peaks depend on outer shell thickness and radius of the core. 相似文献