Biomass burning has widespread impacts on climate,biogeochemical cycles,and human well-being through changes in global and regional aerosol concentrations.To tackle the life-threatening environmental challenges relate...Biomass burning has widespread impacts on climate,biogeochemical cycles,and human well-being through changes in global and regional aerosol concentrations.To tackle the life-threatening environmental challenges related to air pollution,China has launched a series of policies aiming to reduce the pollutionrelated public health crises and social tensions in the sectors of industries,energy,transportation,and land use[1].展开更多
The issue of climate change is among the most difficult environmental problems faced by human beings[1]and affects all social aspects of human life.In 2015,the Paris Agreement set the goal of reducing global greenhous...The issue of climate change is among the most difficult environmental problems faced by human beings[1]and affects all social aspects of human life.In 2015,the Paris Agreement set the goal of reducing global greenhouse gas(GHG)emissions to limit the global temperature increase to 2℃and even further to 1.5℃[2].展开更多
Phosphorus (P) released and transported from wetlands affects wetland ecosystems and surrounding water systems. Sediment samples from the Pelham Bay wetlands in the Bronx, NY, have been collected and analyzed. Analysi...Phosphorus (P) released and transported from wetlands affects wetland ecosystems and surrounding water systems. Sediment samples from the Pelham Bay wetlands in the Bronx, NY, have been collected and analyzed. Analysis of the sorption characteristics, P compound identification and P mineralization, showed significant correlations between the sorption maximum (Smax) and Ox-Fe (r = 0.894), ash-TP and HCl-Ca (r = 0.94), ash-TP and TOC (r = 0.96), as well as TOC vs HCl-Ca (r = 0.93). These results indicate that mineral content affects the OP content and the sorption process. P sorption maxima Smax ranged from 70.4 to 1667 mg/Kg, and the equilibrium P concentration EPC<sub>0</sub> ranged from 0.09 to 0.2 mg/L. The high Smax in most of the sites, fairly high EPC<sub>0</sub> and high percentages of Pr (>96%), indicate substantial amounts of P could be bioavailable for plant uptake in the water column under changing hydro-climatic conditions. Dominant P compounds are dihydroxyacetone phosphate (DHAP), phosphoenolpyruvates (PEP), inosine monophosphate (IMP), glucose-6-phosphate (G6P), nucleoside monophosphates (NMP), glycerophosphate (GlyP), polynucleotides (PolyN), and pyrophosphates (Pyrop). The active P pool could maintain substantial P bioavailability and potentially cause eutrophication. The mineralization of 7, 15 and 30 days in laboratory experiments indicates a decrease of NaHCO<sub>3</sub> and HCl, and an increase of NaOH.展开更多
基金supported by the Start-up Grant from National Institute of Education,Nanyang Technological University,Singapore(022020-00001 SUG2/22 WJY to Jingyu Wang)the Research Grants from the Earth Observatory of Singapore,Nanyang Technological University and the Ministry of Education,Singapore(MOE2019-T2-1-174(S)to Xianfeng Wang)。
文摘Biomass burning has widespread impacts on climate,biogeochemical cycles,and human well-being through changes in global and regional aerosol concentrations.To tackle the life-threatening environmental challenges related to air pollution,China has launched a series of policies aiming to reduce the pollutionrelated public health crises and social tensions in the sectors of industries,energy,transportation,and land use[1].
基金supported by the National Key Research and Development Program of China(2021YFF0306801)National Science Fund for Excellent Young Scholars(52022066)。
文摘The issue of climate change is among the most difficult environmental problems faced by human beings[1]and affects all social aspects of human life.In 2015,the Paris Agreement set the goal of reducing global greenhouse gas(GHG)emissions to limit the global temperature increase to 2℃and even further to 1.5℃[2].
基金supported by the National Natural Science Foundation of China (21838003, 51621002, and 91834301)the Innovation Program of Shanghai Municipal Education Commissionthe Fundamental Research Funds for the Central Universities。
文摘在电解水制氢过程中,为了在低电位下获得超高电流密度,其关键在于打破氧生成反应的标度关系.本文中,我们设计了一种新型异质界面功能化的NiFe(OH)_(x)/Ni_(3)S_(2)电催化剂,成功地规避了析氧反应(OER)的标度关系,使ΔGHOO*-ΔGHO*的差值从3.20 eV降低到2.38 eV.所制备的NiFe(OH)_(x)/Ni_(3)S_(2)电催化剂仅需要310 mV的过电位即可获得2000 mA cm^(-2)的超高电流密度, Tafel斜率仅为20.8 mV dec^(-1).此外,在1000 mA cm^(-2)的电流密度下,稳定运行100小时后无明显的活性损失,该性能优于目前报道的OER催化剂.进一步利用密度泛函理论计算和实验结果揭示了并联催化作用机制,发现多种中间体吸附能均一化能够优化OER反应路径,从而提升超高电流密度下的OER催化性能.本文的研究结果对开发工业级高性能水分解电催化剂具有重要的指导意义.
文摘Phosphorus (P) released and transported from wetlands affects wetland ecosystems and surrounding water systems. Sediment samples from the Pelham Bay wetlands in the Bronx, NY, have been collected and analyzed. Analysis of the sorption characteristics, P compound identification and P mineralization, showed significant correlations between the sorption maximum (Smax) and Ox-Fe (r = 0.894), ash-TP and HCl-Ca (r = 0.94), ash-TP and TOC (r = 0.96), as well as TOC vs HCl-Ca (r = 0.93). These results indicate that mineral content affects the OP content and the sorption process. P sorption maxima Smax ranged from 70.4 to 1667 mg/Kg, and the equilibrium P concentration EPC<sub>0</sub> ranged from 0.09 to 0.2 mg/L. The high Smax in most of the sites, fairly high EPC<sub>0</sub> and high percentages of Pr (>96%), indicate substantial amounts of P could be bioavailable for plant uptake in the water column under changing hydro-climatic conditions. Dominant P compounds are dihydroxyacetone phosphate (DHAP), phosphoenolpyruvates (PEP), inosine monophosphate (IMP), glucose-6-phosphate (G6P), nucleoside monophosphates (NMP), glycerophosphate (GlyP), polynucleotides (PolyN), and pyrophosphates (Pyrop). The active P pool could maintain substantial P bioavailability and potentially cause eutrophication. The mineralization of 7, 15 and 30 days in laboratory experiments indicates a decrease of NaHCO<sub>3</sub> and HCl, and an increase of NaOH.
