| 1. |
- Cao, X., et al.
(författare)
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Comparative studies on annealed proton exchange waveguides in Y-cut MgO : LiNbO3 and Z-cut LiNbO3
- 2004
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Ingår i: Wuli xuebao. - : Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences. - 1000-3290. ; 53:11, s. 3786-3793
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Tidskriftsartikel (refereegranskat)abstract
- Proton exchange waveguides in MgO:LiNbO.3 and LiNbO.3 crystals were fabricated , and the diffusion coefficients for the proton exchange process are obtained. The evolution characteristics of the waveguide index profile in the annealing process are studied. The structural deformation of the proton exchange waveguides in Mg O:LiNbO.3 and LiNbO.3 and the restoration effect of annealing are also studied tho roughly by the x-ray diffraction method and the OH-infrared absorption method. The optical and structural characteristics of annealed proton exchange waveguides in MgO:LiNbO.3 and LiNbO.3 are analysed and compared with eath other.
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| 3. |
- Chen, L., et al.
(författare)
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Analysis for the propagation of evanescent waves and the photo tunneling effect in a multi-layered structure containing materials with negative refractive index
- 2003
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Ingår i: Wuli xuebao. - : Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences. - 1000-3290. ; 52:10, s. 2386-2392
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Tidskriftsartikel (refereegranskat)abstract
- The propagation properties of evanescent waves in a multi-layered structure containing materials with negative refractive index are analyzed. The decay or magnification of the amplitude of evanescent waves in different situations is explained analytically in detail. In particular, the influence of the dissipation of the negative refractive index medium on the photon tunneling effect is discussed. The propagation and energy storage of evanescent waves are shown clearly by using the incidence of a Gauss beam.
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| 5. |
- Cheng, C., et al.
(författare)
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Optimization and elimination of black center of a large-bore copper vapor laser
- 2000
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Ingår i: Wuli xuebao. - : Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences. - 1000-3290. ; 49:7, s. 1267-1272
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Tidskriftsartikel (refereegranskat)abstract
- Applying a genetic algorithm and taking the maximum output as an objective funct ion, a copper vapor laser with about 100W output is optimized and designed for reducing the “black center” of the radial laser intensity. The “black center ”, which results from the skin effect of the continuing pulsed field, is reduce d and the output is increased significantly by optimizing the laser tube radius- length and the LC circuit parameters.
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| 6. |
- Di, Jing, et al.
(författare)
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A novel composite electrolyte based on CeO2 for low temperature solid oxide fuel cells
- 2008
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Ingår i: Journal of Inorganic Materials. - 1000-324X. ; 23:3, s. 573-577
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Tidskriftsartikel (refereegranskat)abstract
- A novel composite material based on mixture of samarium-doped ceria (SDC)-carbonate was studied as electrolyte in low temperature solid oxide fuel cells. The phase and microstructures of composite electrolyte were examined by XRD and SEM. The electrical conductivity was investigated by AC impedance spectroscopy at 400-700 degrees C in different atmospheres. An abrupt change in the conductivity at about 500 degrees C indicates that different mechanisms affect transfer in different temperature ranges. The conductivity increases with the carbonate fraction above 500 degrees C. The conductivity in reduce atmosphere is higher than that in oxide atmosphere. An anode-supported fuel cell using SDC-carbonate as electrolyte was fabricated and tested. The result shows that all the composite electrolytes exhibit better performance than pure SDC electrolyte. The electrolyte with 20wt% carbonate can achieve the highest power density of 415mW center dot cm(-2) and an open circuit voltage of 1.00V at 500 degrees C.
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