Compact disc-based bioassays have been developed as novel point-of-care (POC) tools for various applications in chemical analysis and biomedical diagnosis. For the fabrication of assay discs, the surface patterning and sample introduction have been restricted to manual delivery that is unfavorable f

采用熔盐法分别采用KCl，K2SO4，K2CO3或KNO3为熔融盐和Nb2O5反应，900 ℃下反应2 h合成了铌酸钾晶体。研究了熔融盐的种类对产物组成、形貌和光学性能的影响。X射线衍射检测结果表明分别采用KCl和K2SO4 为熔融盐时的产物为KNb3O8，而采用K2CO3和KNO3为熔融盐时得到的产物为K3NbO4。电子扫描显微镜检测结果表明采用KCl为熔融盐时产物为0.2~0.5 μm宽，1~10 μm长的棒状结构，采用K2SO4为熔融盐时，产物为0.2~1 μm宽，1~25 μm长的棒状结构。采用K2CO3为熔融盐时，产物不是棒状结构,而是不规则颗粒状结构。采用KNO3为熔融盐时，产物为0.2~1 μm宽的棒状结构，长度为0.5~4 μm，部分棒连接在一起。荧光光谱研究表明，以K2SO4，K2CO3和KNO3为熔融盐制备的样品具有非常相似的荧光光谱，以KCl，K2SO4和K2CO3为熔融盐制备的样品具有较好的荧光性。

In this Letter, we propose an optical attenuator based on the phase modulation of a spatial light modulator (SLM). In this system, we use two polarized beam splitters (PBSs) to control the polarized light and one SLM to modulate the phase of the polarized light. In the initial state, the light beam is divided into p-light and s-light when it passes through the first PBS. When the light passes through the second PBS, s-light is reflected and p-light is detected by the CCD camera. By loading diffe

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