[en] Nanocrystalline SnO₂ powders have been synthesized by two-step solid state reaction technique. Firstly, the brown SnO particles were obtained by grinding mixed SnCl₂·2H₂O and KOH powders at room temperature. Then, the powders were calcined in air (thermal oxidation) to form the SnO₂ nanoparticles. The phase compositions and microstructures of the product were examined by thermogravimetry-differential thermal analysis (TG-DTA), X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM), respectively. Furthermore, we have measured the gas-sensing property of the products and found its distinct selectivity towards ethanol at the presence of gasoline and acetylene, which is different from the property of pure SnO₂ nanoparticles. The mechanism of such a specificity was discussed briefly

[en] Using a simple theoretical model, in which it is assumed that laser energy is absorbed resonantly at critical surface, and the laser-produced plasma expands isothermally, the authors simulated the pinhole closure by a laser-produced plasma. It agrees with the experimental results

[en] A small amount of low Z element (Al) was mixed into a middle Z(Ge) target (Ge plasma was used as an X-ray laser gain medium). Using the line intensity ratio of He-like Al ions, the plasma electron density and temperature were determined. Meanwhile, the plasma characteristic was also determined by the line intensity ratio of Ge ions in PLTE model. Both of them are consistent

[en] A semiconductor laser is driven by a electrical circuit of gain switch, the variations of its pulse width and power vs bias current and driving pulse are studied. The optimal parameters are found. The shortest pulse width of this semiconductor laser is 26 ps. Also, using analytical model and numerical calculation, the experimental results are simulated successfully

[en] Using the analytical solutions of the hydrodynamic equations of plasma, energy level populations of the plasma dominated by He-like Mg ions are obtained by solving the rate equations numerically for short pulsed pumping laser. Variations of gain coefficient for MgXI 1s3d-1s4f (λ = 154 angstrom) vs time and spatial position are given. Also the influence of the pumping laser pulse duration is discussed

[en] The electrical conductivity of sulfur-doped C₆₀ films was measured. The results show that the conductivity is enhanced by several orders of magnitude compared with that of pristine C₆₀ films. At low temperature, the conductivity is dominated by sulfur impurity, while it is independent of temperature and metallic in character at high temperature. (orig.)

[en] In this research, we propose a fast-computational light field image encoding method for a white light high-resolution full-parallax holographic 3D display and full-color rainbow holographic 3D display. With this method, a novel priority-based sequential rendering is used to improve the computation speed. The local visible 3D data is rendered at a higher priority and then used for rendering multiple local element light field images (EIs) at the holographic plane with the corresponding pinhole array behind the holographic plane. The EIs are independently coded as hogels by multiplying the corresponding phase function without using computation-intensive fast Fourier transform. This parallel computation method is implemented for both a full-parallax holographic 3D display and full-color rainbow holographic 3D display. An ultra high-resolution of a full-parallax hologram and a full-color rainbow hologram both at the resolution of 200 000 × 200 000 pixels only cost 14 min and 78 min, respectively. Our experimental results have also shown the effectiveness of the proposed high-resolution 3D display method. (paper)