Our recently proposed three-step method showed the promising potential to improve the accuracy of relative wavelength response(RWR) characterization in the wavelength-modulation spectroscopy(WMS) over the commonly use...Our recently proposed three-step method showed the promising potential to improve the accuracy of relative wavelength response(RWR) characterization in the wavelength-modulation spectroscopy(WMS) over the commonly used summation method.A detailed comparison of the three-step method and the summation method,for the wavelength-scanned WMS gas-sensing,was performed with different laser parameters(modulation indexes and scan indexes) and gas properties(pressures and concentrations).Simulation results show that the accuracy of the predicted gas parameters is strongly limited by the RWR characterization with large modulation index and high gas pressure conditions.Both fitting residuals of RWR and errors of predicted gas parameters from the recently proposed three-step method are nearly 2 orders of magnitude smaller than those from the summation method.In addition,the three-step method is further improved by introducing a coupling term for the 2^(nd) harmonic amplitude.Experiments with CO_(2) absorption transition at 6976.2026 cm^(-1) were conducted and validated the simulation analysis.The modified-three-step method presents an improved accuracy in RWR description with at least 5% smaller fitting residual for all conditions compared with the three-step method,although the deviation of the deduced CO_(2) concentrations between these two methods does not exceed 0.2%.展开更多
Cotton diseases represent a major challenge to cotton growth.Cloning of a cotton pathogen response gene and promoter is of great importance to improve disease resistance.In this study,a
The synthesis,characterization,and its response to metal ions of a novel thiourea N,N＇-diethoxycarbonyl-A＂,iV″＇-（1,2- ethylidene） dithiourea was reported.The results show that this dithiourea with new structure ...The synthesis,characterization,and its response to metal ions of a novel thiourea N,N＇-diethoxycarbonyl-A＂,iV″＇-（1,2- ethylidene） dithiourea was reported.The results show that this dithiourea with new structure can react with Cu^（2＋） and Ni^（2＋） separately,and has a best selectivity to Fe^（3＋） ions.Bench-scale flotation tests were also carried out,verifying it has higher copper flotation recovery and better selectivity to sulfide ores containing Cu compared with universal collectors.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.51906120 and 11972213)China Postdoctoral Science Foundation(Grant Nos.2018M640125 and 2019T120088)the National Basic Research Program of China(Grant No.2016YFC0201104)。
文摘Our recently proposed three-step method showed the promising potential to improve the accuracy of relative wavelength response(RWR) characterization in the wavelength-modulation spectroscopy(WMS) over the commonly used summation method.A detailed comparison of the three-step method and the summation method,for the wavelength-scanned WMS gas-sensing,was performed with different laser parameters(modulation indexes and scan indexes) and gas properties(pressures and concentrations).Simulation results show that the accuracy of the predicted gas parameters is strongly limited by the RWR characterization with large modulation index and high gas pressure conditions.Both fitting residuals of RWR and errors of predicted gas parameters from the recently proposed three-step method are nearly 2 orders of magnitude smaller than those from the summation method.In addition,the three-step method is further improved by introducing a coupling term for the 2^(nd) harmonic amplitude.Experiments with CO_(2) absorption transition at 6976.2026 cm^(-1) were conducted and validated the simulation analysis.The modified-three-step method presents an improved accuracy in RWR description with at least 5% smaller fitting residual for all conditions compared with the three-step method,although the deviation of the deduced CO_(2) concentrations between these two methods does not exceed 0.2%.
文摘Cotton diseases represent a major challenge to cotton growth.Cloning of a cotton pathogen response gene and promoter is of great importance to improve disease resistance.In this study,a
基金the financial supports from National High-Tech Research and Development Plan of China(No. 2007AA06Z122)National Basic Research Program of China(No.2007CB613602)National Natural Science Foundation of China(Nos.51074183 and 50604016)
文摘The synthesis,characterization,and its response to metal ions of a novel thiourea N,N＇-diethoxycarbonyl-A＂,iV″＇-（1,2- ethylidene） dithiourea was reported.The results show that this dithiourea with new structure can react with Cu^（2＋） and Ni^（2＋） separately,and has a best selectivity to Fe^（3＋） ions.Bench-scale flotation tests were also carried out,verifying it has higher copper flotation recovery and better selectivity to sulfide ores containing Cu compared with universal collectors.
