Investigation and evaluation of the ground water quality at Dongnanjiu Village in Changling Town were introduced.Evaluation of water quality was done according to the Quality Standard for Ground Water (GB/T 14848-93)....Investigation and evaluation of the ground water quality at Dongnanjiu Village in Changling Town were introduced.Evaluation of water quality was done according to the Quality Standard for Ground Water (GB/T 14848-93).The results conformed to category Ⅳ.Hence the water can be used for domestic purposes after special treatment process.展开更多
The measurement of an extremely small magneto-optical polarization rotation angle with high sensitivity is integral to many scientific and technological applications. In this Letter, we have presented a technique base...The measurement of an extremely small magneto-optical polarization rotation angle with high sensitivity is integral to many scientific and technological applications. In this Letter, we have presented a technique based on Faraday modulation combined with the optical differential method to measure an extremely small polari- zation rotation angle with high sensitivity. The theoretical and experimental results show that common mode noise is reduced appreciably and signal to noise ratio is enhanced. The effectiveness of this technique has been demonstrated by measuring the Verdet constant of terbium gallium garnet glass and measuring the small polari- zation rotation angle. A sensitivity of enhancement of one order of magnitude has been achieved using differ- ential detection based on Faraday modulation.展开更多
文摘Investigation and evaluation of the ground water quality at Dongnanjiu Village in Changling Town were introduced.Evaluation of water quality was done according to the Quality Standard for Ground Water (GB/T 14848-93).The results conformed to category Ⅳ.Hence the water can be used for domestic purposes after special treatment process.
基金supported by the National Key R&D Program of China(No.2017YFB0503100)the National Science Foundation of China(NSFC)(No.61227902)
文摘The measurement of an extremely small magneto-optical polarization rotation angle with high sensitivity is integral to many scientific and technological applications. In this Letter, we have presented a technique based on Faraday modulation combined with the optical differential method to measure an extremely small polari- zation rotation angle with high sensitivity. The theoretical and experimental results show that common mode noise is reduced appreciably and signal to noise ratio is enhanced. The effectiveness of this technique has been demonstrated by measuring the Verdet constant of terbium gallium garnet glass and measuring the small polari- zation rotation angle. A sensitivity of enhancement of one order of magnitude has been achieved using differ- ential detection based on Faraday modulation.
