纳氏试剂分光光度法测定水中氨氮—色度的干扰及消除方法

氨氮测定时,水样带有颜色会产生干扰,影响测定结果的准确性,需作适当处理,以消除影响。文章通过比较稀释、絮凝、蒸馏三种方法在氨氮测定中对色度干扰的消除作用,发现稀释可以消除轻微的色度干扰,蒸馏对轻、重色度干扰均有很好的消除作用,而絮凝对色度干扰则无明显消除作用。

纳氏试剂光度法测定氨氮过程中影响因素的探讨

目前水质检测中氨氮的测定多采用纳氏试剂光度法(GB/T7479-1987)。该方法在实际操作过程中存在多种因素影响测定结果,本文对纳氏试剂光度法测定氨氮过程的影响因素做了探讨。

Scaling and Pixel Crosstalk Considerations for CMOS Image Sensor

With the scaling development of the minimum lithographic size,the scaling trend of CMOS imager pixel size and fill factor has been computed according to the Moore rule.When the CMOS minimum lithographic feature scales down to 0.35 μm,the CCD image pixel size is not so easy to be reduced and but the CMOS image pixel size benefits from the scaling minimum lithographic feature. However, when the CMOS technology is downscaled to or under 0.35 μm,the fabrication of CMOS image sensors will be limited by the standard CMOS process in both ways of shallow trench isolation and source/drain junction,which results in pixel crosstalk.The impact of the crosstalk on the active pixel CMOS image sensor is analyzed based on the technology scaling.Some suppressed crosstalk methods have been reviewed.The best way is that combining the advantages of CMOS and SOI technology to fabricate the image sensors will reduce the pixel crosstalk.

交织输出3DTV图像清晰度的调节方法

利用传统技术在调节交织输出的3D电视信号的清晰度时，会引起图像的重影问题。为了克服现有2D技术对图像清晰度调节的不足，对交织输出的3D电视清晰度提升，可以在左/右眼图像信号合成交织图像后，只针对单一方向（水平或垂直）的清晰度做提升，然后再输出到显示屏。这样既可以改善3D画面的清晰效果，同时可以消除因为调整清晰度而引起的画面重影问题。