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| 1 | Hygroscopic growth of aerosol scattering coefficient:A comparative analysis between urban and suburban sites at winter in Beijing显示文摘A humidity controlled inlet system was developed to measure the hygroscopic growth of aerosol scattering coefficient in conjunction with nephelometry at an urban site of Chinese Academy of Meteorological Sciences (CAMS) in Beijing and a rural site at Shangdianzi Regional Background Air Pollution Monitoring Station (SDZ) outside Beijing during winter, from December 2005 to January 2006. Measurements were carried out at a wavelength of 525 nm with an Ecotech M9003 nephelometer. The hygroscopic growth function (or factor) of the aerosol scattering coefficient f(RH) increased continuously with increasing relative humidity (RH) and showed no obvious 'step-like' deliquescent behavior at both sites during the experiment. The average growth factor f(RH) at the SDZ site could reach 1.5 when RH increased from less than 40% to 92%, and to 2.1 at the CAMS site when RH increased from less than 40% to 93%. The average hygroscopic growth factor at a relative humidity of 80%, f(RH = 80 ± 1%), was found to be about 1.26 ± 0.15 at CAMS and 1.24 ± 0.11 at SDZ. Further analysis indicated that under relatively polluted conditions, the average hygroscopic growth factor was higher at the CAMS site than that at the SDZ site. However, under relatively clean air conditions, the difference between the two sites was small, showing a hygroscopic growth behavior similar to those of burning biomass or blowing dust. These results reflected the different characteristics of aerosol types at the two sites. | Peng Yan Xiaole Pan Jie Tang Xiuji Zhou Renjian Zhang Limin Zeng | 2009 | Particuology2009，7，1： | 30 |
| 2 | Inorganic chemical composition and source signature of PM2.5 in Beijing during ACE-Asia period显示文摘Aerosol samples for PM2.5 were collected in Beijing for 38 consecutive days from March to April 2001 using an IMPROVE Sampler. Concentrations of 20 elements in PM2.5 were determined using a PIXE method. Results show that the average mineral dust concentration of PM2.5 was 14.6 mg/m3 during the observation period. On the sand-dust event days of March 21 and April 10, dust PM2.5 mass concentrations were 62.4 and 54.1 mg/m3, respectively. These demonstrate that fine particle pollution by dust event in Beijing was very severe. The enrichment factors of S and Cu reached minimums on the dusty days and were high on the non-dusty days. It is considered that enrichment factors of elements in PM2.5, which are associated with human activities, can probably provide an effective method to distinguish local sources from external sources of dust. Factor analysis on the chemical composition in PM2.5 shows that sources of crustal matters, anthropogenic emission, and oil combustion contributed to PM2.5 levels in air in the springtime of 2001 in Beijing. | ZHANG Renjian, XU Yongfu & HAN Zhiwei LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | 2003 | Chinese Science Bulletin2003，48，10： | 24 |
| 3 | PM_(2.5) and PM_(10-2.5) chemical composition and source apportionment near a Hong Kong roadway显示文摘Twenty-four-hour PM_(2.5) and PM_(10) samples were collected simultaneously at a highly trafficked roadside site in Hong Kong every sixth day from October 2004 to September 2005.The mass concentrations of PM_(2.5),PM_(10-2.5)(defined as PM_(10)- PM_(2.5)),organic carbon(OC),elemental carbon(EC),water-soluble ions,and up to 25 elements were determined.Investigation of the chemical compositions and potential sources revealed distinct differences between PM_(2.5) and PM_(10-2.5).The annual average mass concentrations were 55.5±25.5 and 25.9±15.7 ug/m^3 for PM_(2.5) and PM_(10-2.5),respectively.EC,OM(OM =OC×1.4),and ammonium sulfate comprised over ~82% of PM_(2.5),accounting for^29%,~27%,and ~25%,respectively,of the PM_(2.5) mass.Low OC/EC ratios(less than 1) for PM_(2.5) suggested that fresh diesel-engine exhaust was a major contributor.Seven sources were resolved for PM_(2.5) by positive matrix factorization(PMF) model,including vehicle emissions(~29%),secondary inorganic aerosols(~27%),waste incinerator/biomass burning(~23%),residual oil combustion(~10%),marine aerosols(~6%),industrial exhaust(~4%),and resuspended road dust(~1%).EC and OM comprised only ~19%of PM_(10-2.5).The average OC/EC ratio of PM_(10-2.5) was 7.8±14.2,suggesting that sources other than vehicular exhaust were important contributors.The sources for PM_(10-2.5) determined by the PMF model included ~20%traffic-generated resuspension(e.g.,tire dust/brake linear/petrol evaporation),~17% locally resuspended road dust,~17% marine aerosols,~12% secondary aerosols/field burning,and ~11%vehicle emissions. | Yan Cheng Shuncheng Lee Zhaolin Gu Kinfai Ho Yunwei Zhang Yu Huang Judith C.Chow John G.Watson Junji Cao Renjian Zhang | 2015 | Particuology2015，13，1： | 14 |
| 4 | Adaptive Robust Dead-Zone Compensation Control of Electro-Hydraulic Servo Systems with Load Disturbance Rejection显示文摘A backstepping method based adaptive robust dead-zone compensation controller is proposed for the electro-hydraulic servo systems(EHSSs) with unknown dead-zone and uncertain system parameters.Variable load is seen as a sum of a constant and a variable part.The constant part is regarded as a parameter of the system to be estimated real time.The variable part together with the friction are seen as disturbance so that a robust term in the controller can be adopted to reject them.Compared with the traditional dead-zone compensation method,a dead-zone compensator is incorporated in the EHSS without constructing a dead-zone inverse.Combining backstepping method,an adaptive robust controller(ARC) with dead-zone compensation is formed.An easy-to-use ARC tuning method is also proposed after a further analysis of the ARC structure.Simulations show that the proposed method has a splendid tracking performance,all the uncertain parameters can be estimated,and the disturbance has been rejected while the dead-zone term is well estimated and compensated. | HE Yudong WANG Junzheng HAO Renjian | 2015 | Journal of Systems Science & Complexity2015，28，2： | 14 |
| 5 | Chemical properties and origin of dust aerosols in Beijing during springtime显示文摘Ground observation of dust aerosols was conducted in Beijing in the spring of 2005 in order to investigate the element composition and origin of mineral dust. Mass concentrations of most mineral elements of particles increased during dust events. Mineral elements were predominant in the sums of total element loadings in both dusty and non-dusty days. Mg, Si, Fe, Al or Ti can be used as an indicator of dust out?ow; Cl can be viewed as an evidence of dust particles mixing with anthropogenic emissions. Mineral and pollutant elements showed a bimodal mass particle-size distribution (MSD) in non-dusty days, and a trimodal distribution in dusty days, but their peak concentrations fell in different size stages. Zn and S were mainly enriched in fine particles, whereas Cl was enriched in medium particles, but most mineral elements and Cu were enriched in coarse particles. Mineral elements were dominated by crustal material in dusty even non-dusty days, but pollutant elements were from non-crustal material including local and remote sources. Back trajectory analysis indicated that dust particles in Beijing mainly originated from the Gobi and desert regions of Mongolian and northern China. | Renjian Zhang Zhiwei Han Tiantao Cheng Jun Tao | 2009 | Particuology2009，7，1： | 13 |
| 6 | Impacts of aerosol chemical compositions on optical properties in urban Beijing,China显示文摘The optical properties of aerosols and their chemical composition,including water-soluble ions,organic carbon(OC),and elemental carbon(EC) in PM_(2.5) and PM_(10),were measured from 26 May to 30 June of 2012 at an urban site in Beijing.The daily average concentrations of PM_(2.5) and PM_(10) were 103.2 and 159.6 μg/m^3,respectively.On average,the OC and EC contributed 20.1% and 4.3% ,respectively,to PM_(2.5) and 16.3% and3.9% ,respectively,to PM_(10).Secondary ions(SO_4^(2-),NO_3^-,and NH_4^+) dominated the water-soluble ions and accounted for 57.9% and 62.6% of PM_(2.5) and PM_(10),respectively.The wind dependence of PM_(2.5),OC,SO_4^(2-),and NO_3^- implied that the pollution sources mainly came from south and southeast of Beijing during the summer.The monthly mean values of the scattering coefficient(σ_(sc)) and absorption coefficient(σ_(ab)) at525 nm were 312.9 and 28.7 Mm^(-1),respectively,and the mean single-scattering albedo(ω) was 0.85.The wind dependence of σ_(sc) revealed that this value was mainly influenced by regional transport during the summer,and the relationship between σ_(ab) and wind indicated that a high σ_(ab) resulted from the joint effects of local emissions and regional transport.The reconstructed σ_(sc) that was derived from the revised IMPROVE equation agreed well with the observations.The contribution of different chemical species toσ_(sc) was investigated under different pollution levels,and it was found that secondary inorganic aerosols accounted for a large part of σ_(sc) during pollution episodes(35.7% ),while organic matter was the main contributor to σ_(sc) under clean conditions(33.6% ). | Ping Tian Guangfu Wang Renjian Zhang Yunfei Wu Peng Yan | 2015 | Particuology2015，13，1： | 5 |
| 7 | Molecular distribution and seasonal variation of hydrocarbons in PM_(2.5) from Beijing during 2006显示文摘正常(n) 链烷和多不的芳香的烃(哼) 在 2006 从北京在 PM2.5 被收集并且分析了使用一种热 desorption-GC/MS 技术。n 链烷的年度平均集中并且哼 282 是 ????????????? ? ㈠ ?? 朠洯″ ???? ?? | Yushan Li Junji Cao Jianjun Li Jiamao Zhou Hongmei Xu Renjian Zhang Zhiyun Ouyang | 2013 | Particuology2013，11，1： | 5 |
| 8 | Atmospheric Pb levels over Mount Qomolangma region显示文摘The Pb spectral concentration of atmospheric aerosol samples observed over Mount Qomolangma site (28°11′ 33″ N, 86°49′ 59″ E, 4950 m ASL) in 2002 was 13.3 ng/m3, about 4.5 times higher than that in 2000. The Pb spectral distribution showed three peaks, located at <0.25 m, 0.5-1 m, and 4-8 m in diameters. The peaks for <0.25 m and 0.25-0.5 m may be due to long-distant transport, while that for 4-8 m probably results from local floating dust. The atmospheric Pb concentration over Mount Qomolangma was lower than that of South Pole, most of the urban areas, and desert areas in the northern hemisphere. The enrichment factors for fine and coarse particles of atmospheric Pb in 2002 over Mount Qomolangma were 413.2 and 62.6, respectively, in support of the slight atmospheric pollution with Pb over the Qinghai-Tibetan Plateau. | Renjian Zhang Zhenxing Shen Han Zou | 2009 | Particuology2009，7，3： | 5 |
| 9 | Optical properties and chemical composition of PM_(2.5) in Shanghai in the spring of 2012显示文摘The semi-diurnal mean aerosol mass concentration, chemical composition, and optical properties of PM2.5were investigated in Shanghai during the spring of 2012. Slight pollution was observed during the study period. The average PM2.5 concentration was 64.11 土 22.83(xg/m3. The mean coefficients of extinction,scattering, and absorption at 532 nm were 125.9 士 78.5,91.1 士 56.3,and 34.9 士 23.6 Mm-1, respectively. A relatively low mean single scattering albedo at 532 nm(0.73 士 0.04) and low level of elemental carbon(EC,2.67 士 1.96 |xg/m3) suggested that the light absorption was enhanced due to the internal mixing of the EC.Sulfate contributed the most to aerosol light scattering in Shanghai. The chemical composition of PM2.5was dominated by particulate organic matter, sulfate, nitrate, ammonium, and EC. Anthropogenic sources made a significant contribution to the emission and loading of the particulate pollutants. A relatively good correlation between the aerosol chemical composition and the cloud condensation nuclei(CCN) activation indicated that aerosol chemistry is an important factor that influences the saturated hygroscopicity and growth of the aerosol. | Guanghan Huang Tiantao Cheng Renjian Zhang Jun Tao Chunpeng Leng Yunwei Zhang Shuping Zha Deqin Zhang Xiang Li Chunyang Xu | 2014 | Particuology2014，12，2： | 4 |
| 10 | Automatic Matching of Multi-scale Road Networks under the Constraints of Smaller Scale Road Meshes显示文摘In this paper,we propose a new method to achieve automatic matching of multi-scale roads under the constraints of smaller scale data.The matching process is:Firstly,meshes are extracted from two different scales road data.Secondly,several basic meshes in the larger scale road network will be merged into a composite one which is matched with one mesh in the smaller scale road network,to complete the N∶1(N>1)and 1∶1 matching.Thirdly,meshes of the two different scale road data with M∶N(M>1,N>1)matching relationships will be matched.Finally,roads will be classified into two categories under the constraints of meshes:mesh boundary roads and mesh internal roads,and then matchings between the two scales meshes will be carried out within their own categories according to the matching relationships.The results show that roads of different scales will be more precisely matched using the proposed method. | Hongxing PEI Renjian ZHAI Fang WU Jinghan LI Xianyong GONG Zheng WU | 2019 | Journal of Geodesy and Geoinformation Science2019，2，4： | 4 |
| 11 | Source,route and effect of Asian sand dust on environment and the oceans显示文摘We summarize in this overview achievements in current research frontiers in Asian sand dust with emphasis on the method for sand dust research,the sources of sand dust aerosols,emission of sand dust,mechanism of sand dust weather,chemical transformation during transport,and influences on climatic environment and oceans.Our main results show that most of Asian sand dust comes from Mongolia,the Gobi Desert,arid and semiarid desert areas in northwest China,which is divided into initial sources and enhanced sources.Half of the global production of dust originates from Asian dust source regions.Asian dust weather is so immense that it can cover a 5-7-day journey from the sources to the Korean Peninsula,Japan Islands,and the Pacific Ocean to even impact North America.Asian dust weather plays an active role in the biogeochemical cycles of trace elements in the mid-latitude Northern Hemisphere. | Kai Zhang Fahe Chai Renjian Zhang Zhigang Xue | 2010 | Particuology2010，8，4： | 3 |
| 12 | COMPARISON OF SIMULATING MINERAL DUST AEROSOLS IN EAST ASIA BY TWO EMISSION SCHEMES显示文摘Two common surface-dust emission schemes using critical wind speed and friction velocity were com-pared with the regional climate model RegCM3 in East Asia. In the comparison, transport of mineral dust and its distri-bution were simulated from March to April, 2001. Simulation results were also compared with TOMS aerosol index, showing that obvious differences exist in dust emission quantity and its column burden simulated by the dust emission schemes of friction velocity and wind speed criteria. The results obtained by the wind speed criterion are higher than that by friction velocity, bringing forth the problem whether or not the dust emission scheme matches the model. The obvious difference in the two schemes also explains the uncertainty of simulating mineral dust aerosol by modeling. | Jian Wu Yanyan Xu Congbin FU Renjian Zhang Min Dai Yong Zhu | 2006 | China Particuology2006，4，6： | 2 |
| 13 | INTRODUCING A NEW INTERNATIONAL PROGRAM:MONSOON ASIA INTEGRATED REGIONAL STUDY (MAIRS)显示文摘The Monsoon Asia Integrated Regional Study (MAIRS) is a new Earth System Science Partnership (ESSP) program aimed at the integrated study of environmental changes over monsoon Asian region. This paper briefly intro-duces MAIRS, its background and concept, scientific themes and objectives, data requirements and its information sys-tem, intensive observation experiment, and its linkage with ongoing international projects. | Congbin Fu Ailikun Renjian Zhang Xiaodong Yan | 2006 | China Particuology2006，4，6： | 2 |
| 14 | Hierarchical Area Partitioning Method of Urban Road Networks Matching显示文摘In view of the “Node-Arc” data model of road network in the aspect of structured expressing the deficiencies, the hierarchical area partitioning of road network based on the principle of stroke, which made road network space structure characteristics of the expression with the hierarchical feature was designed. Based on road hierarchy and connected relationship with the area domain boundaries, the road in the area was hierarchically divided. A hierarchical model was established based on “whole-part-object” data model. Finally, the model of urban road network matching is proposed, which used consistency evaluation model selected matching objects from high-grade road to the low-level road. The experiment results indicated that the method was suitable to solve the road matching problem with typical urban features. | Bohua HUANG Wei ZHONG Renjian ZHAI Qing ZHOU | 2019 | Journal of Geodesy and Geoinformation Science2019，2，3： | 1 |
| 15 | Preliminary research on the size distribution of aerosols in Beijing 显示文摘 | ZHANG Renjian WANG Mingxing FU Jianzhong | 2000 | Advances in Atmospheric Sciences2000，2，： | 1 |
| 16 | A scalable bandwidth allocation method for synchronous wireless mesh network显示文摘 | LV Renjian | | 0，，19： | 1 |
| 17 | Sequence analysis and typing of Saprolegnia strains isolated from freshwater fish from Southern Chinese regions显示文摘Saprolegniasis,caused by Saprolegnia infection,is one of the most common diseases in freshwater fish.Our study aimed to determine the epidemiological characteristics of saprolegniasis in Chinese regions of high incidence.Saprolegnia were isolated and identified by morphological and molecular methods targeting the internal transcribed spacer(ITS)ribosomal DNA(rDNA)and building neighbor-joining(NJ)and maximum parsimony(MP)phylogenetic trees.The ITS sequences of eight isolated strains were compared with GenBank sequences and all strains fell into three clades:CLADE1(02,LP,04 and 14),CLADE2(S1),and CLADE3(CP,S2,L5 and the reference ATCC200013).Isolates 02 and LP shared 80%sequence similarity with S.diclina,S.longicaulis,S.ferax,S.mixta,and S.anomalies.Further,isolates 04 and 14 shared 80%similarity with S.bulbosa and S.oliviae.Finally,extremely high ITS sequence similarities were identified between isolates S1 and S.australis(100%);CP and S.hypogyna(96%);and S2,L5,ATCC200013 and S.salmonis(98%).This research provides insights into the identification,prevention and control of saprolegniasis pathogens and the potential development of effective drugs. | Siya Liu Pengpeng Song Renjian Ou Wenhong Fang Mao Lin Jiming Ruan Xianle Yang Kun Hu | 2017 | Aquaculture and Fisheries2017，2，5： | 1 |
| 18 | Characterization of visibility and its affecting factors over Nanjing, China显示文摘 | Junjun Deng Tijian Wang Ziqiang Jiang Min Xie Renjian Zhang Xiaoxian Huang Jialei Zhu | 2011 | Atmospheric Research2011，，3： | 1 |
| 19 | Bulk metglas, finemet and nanoperm soft magnetic alloys prepared by ultra-high-pressure consolidation显示文摘 | Wei Lu Biao Yan Renjian Tang | 2006 | Journal of Alloys and Compounds2006，，1： | 1 |
| 20 | Analysis on the chemical and physical properties of particles in a dust storm in spring in Beijing 显示文摘 | Zhang Renjian Wang Mingxing Zhang Xiaoye | 2003 | Powder Technology2003，137，： | 1 |
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