|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | A preliminary analysis of the surface chemistry of atmospheric aerosol particles in a typical urban area of Beijing显示文摘Atmospheric aerosol particle samples were collected using an Ambient Eight Stage(Non-Viable) Cascade Impactor Sampler in a typical urban area of Beijing from 27 th Sep.to 5th Oct.,2009.The surface chemistry of these aerosol particles was analyzed using Static Time of Flight-Secondary Ion Mass Spectrometry(Static TOF-SIMS).The factors influencing surface compositions were evaluated in conjunction with the air pollution levels,meteorological factors,and air mass transport for the sampling period.The results show that a variety of organic ion groups and inorganic ions/ion groups were accumulated on the surfaces of aerosol particles in urban areas of Beijing;and hydrophobic organic compounds with short-or middle-chain alkyl as well as hydrophilic secondary inorganic compounds were observed.All these compounds have the potential to affect the atmospheric behavior of urban aerosol particles.PM1.1–2.1and PM3.3–4.7had similar elements on their surfaces,but some molecules and ionic groups demonstrated differences in Time of Flight-Secondary Ion Mass Spectrometry spectra.This suggests that the quantities of elements varied between PM1.1–2.1and PM3.3–4.7.In particular,more intense research efforts into fluoride pollution are required,because the fluorides on aerosol surfaces have the potential to harm human health.The levels of air pollution had the most significant influence on the surface compositions of aerosol particles in our study.Hence,heavier air pollution was associated with more complex surface compositions on aerosol particles.In addition,wind,rainfall,and air masses from the south also greatly influenced the surface compositions of these urban aerosol particles. | Zhengzheng Zhang Hong Li Hongyan Liu Runxiang Ni Jinjuan Li Liqun Deng Defeng Lu Xueli Cheng Pengli Duan Wenjun Li | 2016 | Journal of Environmental Sciences2016，28，9： | 5 |
| 2 | Role of oxidative stress in alcohol-induced liver injury显示文摘 | Arthur I. Cederbaum Yongke Lu Defeng Wu | 2009 | Archives of Toxicology2009，，6： | 5 |
| 3 | TOF–SIMS surface analysis of chemical components of size–fractioned urban aerosols in a typical heavy air pollution event in Beijing显示文摘Size–fractioned atmospheric aerosol particles were collected during a typical heavy air pollution event in Beijing. The organic and inorganic components on the surfaces of the samples were analyzed using time–of–flight secondary ion mass spectrometry(TOF–SIMS).The variation characteristics of the surface chemical composition and influencing factors were studied, and the possible sources of these chemical compositions were identified through principal component analysis. The results showed that inorganic components such as crustal elements and sulfate, and organic components such as aliphatic hydrocarbons and oxygen–containing organic groups were present. Some surface components, such as polycyclic aromatic hydrocarbons, heavy metals and fluorides may exert adverse effects on human health. The species and relative percentages of the chemical components varied with particle size, diurnal and pollution progress. During a heavy pollution event, the species and relative percentages of secondary components such as oxygen–containing organic groups and sulfurous compounds increased, indicating that particles aged during this event. The surface chemical composition of the aerosol particles was affected mainly by emissions from coal combustion and motor vehicles. In addition, air pollution, meteorological factors, and air mass transport also exerted a significant effect on the surface chemical composition of aerosol particles. | Wenjun Li Hong Li Jinjuan Li Xueli Cheng Zhengzheng Zhang Fahe Chai Hao Zhang Ting Yang Pengli Duan Defeng Lu Yizhen Chen | 2018 | Journal of Environmental Sciences2018，30，7： | 2 |
| 4 | Role of oxidative stress in alcohol-induced liver injury显示文摘 | Arthur I. Cederbaum Yongke Lu Defeng Wu | 2009 | Archives of Toxicology2009，，6： | 2 |
| 5 | Role of oxidative stress in alcohol-induced liver injury显示文摘 | Arthur I. Cederbaum Yongke Lu Defeng Wu | 2009 | Archives of Toxicology2009，，6： | 1 |
| 6 | Going Green : How Different Ad- vertising Appeals Impact Green Consumption Behavior显示文摘 | Defeng Yang Yue Lu Wenting Zhu | 2015 | Journal of Business Research2015，，68： | 1 |
| 7 | Characterization and overexpression of a-hydrogenase gene of a novel hydrogen-producing bacterium ethanoligenens harbinense显示文摘 | ZHAO XIN XING DEFENG ZHANG LU | 2010 | International Journal of Hydrogen Energy2010，35，： | 1 |
| 8 | Provenance System Analysis of the Nantun Formation of the Huhehu Sag in Hailar Basin显示文摘Huhehu Sag is a new battlefield for the future oil and gas exploration in the Hailar Basin.At present,exploration of this area stays at a low level and the understanding of the provenance system of the Nantun Formation is comparatively weak.So,to carry out the detailed depiction of the provenance system in the study area is significant for the sedimentary system reconstruction,for the prediction of reservoir distribution and favorable areas.Based on comprehensive analysis of paleogeomorphy,light-heavy mineral and seismic reflection features,sandstone thickness and sandstone percentage,this paper analyzes in detail the provenance system of the Nantun Formation in Huhehu Sag from various angles and levels.It shows that provenances of the Huhehu Sag mainly originated from the eastern Xilinbeier Salient and western Bayan Mountain Uplift.The provenances surrounding the lake basin converged to the center of the basin,among which,the steep slope belt and the gentle slope belt are the main provenances,and the southern uplift is a secondary one.The distribution framework of the provenance fundamentally determines the distribution rules of the depositional system and its sand body developing during the Nantun period. | LI Junhui MENG Qi'an LU Shuangfang ZHU Defeng WU Haibo LIU He ZHANG Dazhi | 2012 | Acta Geologica Sinica(English Edition)2012，86，1： | 1 |
| 9 | Enhanced hydrogen production from waste activated sludge by cascade utilization of organic matter in microbial显示文摘 | LU Lu XING Defeng LIU Bingfeng | 2012 | Water Research2012，46，4： | 1 |
| 10 | Hydrogen production with efflu- ent from an ethanol-He coproducing fermentation reactor using a sin- gle-chamber microbial electrolysis cell显示文摘 | Lu Lu Ren Nanqi Xing Defeng | 2009 | Bioser:ors and Bioelectron- /cs2009，24，： | 1 |
| 11 | Syntrophic inter-actions drive the hydrogen production from glucose at low temperature in microbial electrolysis cells显示文摘 | LU Lu XING Defeng REN Nanqi | | 0，，： | 1 |
| 12 | A hypothesis of 3D rainfall tomography using satellite signals显示文摘The attenuation of microwave signals due to rainfall,known as rain attenuation,can be used to measure rain.Similar to using X-ray to carry out human-body CT scans,the microwave signals of low earth and/or medium earth orbit satellites are proposed for carrying out 3D(Three Dimensional)rainfall tomography in this paper.The proposed method will not only complement the three major rain measurement methods in use today(i.e.rain gauge,weather radar,and weather satellite)but also potentially achieve 3D rainfall measurements with precision and coverage unachievable before.Along with the deployment of low earth orbit satellite constellations(e.g.the OneWeb constellation)for global broadband Internet services,small satellite receivers of the size of a pizza box may be used to achieve 3D rainfall tomography anywhere on the Earth,thereby paving the way for many practical applications and atmospheric research that are associated with rainfall. | HUANG Defeng(David) XU Lu FENG Xuxiang WANG Wanyu | 2016 | Journal of Communications and Information Networks2016，1，1： | 1 |
| 13 | Ferric iron enhances electricity generation by Shewanella oneidensis MR-1 in MFCs显示文摘 | Di Wu Defeng Xing Lu Lu Ma Wei Bingfeng Liu Nanqi Ren | 2012 | Bioresource Technology2012，，： | 1 |
| 14 | Normalized fatigue properties of asphalt mixture at various temperatures显示文摘This study normalized the mixture's fatigue behavior at various temperatures,and the strength and fatigue tests of the mixture were conducted.The stress state of the asphalt mixture includes direct tensile,uniaxial compression,and indirect tensile.The Desai yield surface and fatigue path were proposed.And a normalized fatigue characteristics model of the mixture was established.The following conclusions were obtained.With the increases in the loading rate,the strength of the asphalt mixture increased.As the temperature increases,the strength of the mixture is reduced.At various temperatures and rates,the strength forms a closed curved surface.The Desai strength yield surface was established,which forms a closed curved surface.When the loading rate and temperature are below a certain critical line,the asphalt mixture will not undergo strength damage.At a fixed stress state,the fatigue damage path of the mixture was determined.The stress ratio was determined considering the influence of the loading rate.In this way,a normalized model can be described to express the asphalt mixture fatigue properties at various temperatures and stress levels.For the asphalt mixture in an indirect tensile state,the normalized fatigue equation parameter is 4.09.This model is more suitable for reflecting the viscous-elastic behavior of the mixtures than the fatigue equation determined by the notional stress ratio. | Dongdong Ge Zihao Ju Defeng Duan Songtao Lyu Weiwei Lu Chaochao Liu | 2023 | Journal of Road Engineering2023，3，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员