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为了打造生态沣河,本文基于秦渡镇断面2001-2009年的定期水质监测资料,以及秦渡镇水文站2001年到2009年的逐日流量数据,以及2009年到2011年大峪口断面、秦渡镇断面的多场洪水监测资料,研究分析了沣河水质与流量之间的关系.结果表明:(1)监测断面流量的大小和每场洪水平均流量的大小均对NH3-N、TN和COD的污染浓度有影响,且流域上下游不同断面的水质流量之间的关系也有差异;(2)根据2002年到2008年秦渡镇断面所监测的6场洪水资料,可知洪水对COD非点源污染的影响较大.而2006年NH3-N、TN的点源污染严重,此外几年NH3-N的点源污染较严重,TN变化不稳定. 相似文献
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R.F.Muniz V.S.Zanuto M.S.Gibin J.V.Gunha A.Novatski J.H.Rohling A.N.Medina M.L.Baesso 《中国稀土学报(英文版)》2023,41(3):342-348
Novel Nd3+/Yb3+ co-doped sodium calcium silicate glasses were prepared by melting quenching method:Spectroscopic study was carried out as a function of doping content by fixing sensitizer(Nd3+) concentration to 0.2 mol% and adjusting activator(Yb3+) from 0 to 1.0 mol%.The energy transfer(ET)mechanisms between Nd3+and Yb3+ are discussed based on their energy levels and excitation powerdependence emission intensity.Results show that... 相似文献
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《International Journal of Hydrogen Energy》2019,44(23):11684-11694
Transition metal phosphides represent a class of promising electrocatalysts for electrochemical water oxidization and other energy conversion reactions. In this work, we report a novel seal strategy, followed by a second step phosphorization treatment, produces Ni-Fe-P heterostructure directly grown on nickel foam that shows highly catalytic activity for electrochemical water oxidation. The as-prepared catalyst exhibits an excellent electrocatalytic activity, manifested by a current density of 20 mA cm−2 with a very low overpotential (260 mV) for oxygen evolution reaction along with an extremely small Tafel slope of 27 mV decade−1 and a very excellent durability of 120 h in alkaline solution. The excellent performance with exceptional durability owe much to the synergistic effect between the Ni-Fe-P heterostructure and the outer oxidized layer. Remarkably, a current density of 10 mA cm−2 was reached at a low cell voltage of 1.63 V when the original electrode and surface oxidized electrode are used as cathode and anode, respectively. 相似文献
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