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| 1 | Effect of chemical composition of PM_(2.5) on visibility in Guangzhou,China,2007 spring显示文摘The object of this study was to investigate the correlation of visibility with chemical composition of PM2.5 in Guangzhou. In April 2007, 28 PM2.5 samples were collected daily at the monitoring station of the South China Institute of Environmental Sciences (SCIES), in urban Guangzhou. Water-soluble ionic species (Cl-, NO3-, SO42-, NH4+, K+, Na+, Ca2+, and Mg2+) and carbonaceous contents (OC and EC) of the PM2.5 samples were determined to characterize their impact on visibility impairment. The results showed that sulfate was the dominant species that affected both light scattering and visibility. The average percentage contributions of the visibility-degrading species to light scattering coefficient were 40% for sulfate, 16% for nitrate, 22% for organics, and 22% for elemental carbon. Because of its foremost effect on visibility, sulfate reduction in PM2.5 would effectively improve the visibility of Guangzhou. | Jun Tao Kin-Fai Ho Laiguo Chen Lihua Zhu Jinglei Han Zhencheng Xu | 2009 | Particuology2009，7，1： | 75 |
| 2 | Heavy metal concentrations of agricultural soils and vegetables from Dongguan, Guangdong显示文摘118 农业土壤和 43 件蔬菜样品的一个总数从 Dongguan 城市被收集,广东,中国。空间分发,来源,累积特征和在农业土壤和蔬菜的重金属的潜在的风险被三条不同途径在细节描绘,包括在土壤和蔬菜的八个金属元素的全部的内容,在在学习的土壤的重金属的 GIS 地图和 multivariate 分析。结果证明在农业土壤有象 Cu , Zn , Ni , Pb , Cd 和 Hg 那样的重金属的更高的累积,并且 Pb 的内容( 65.38 mg kg ? 2 )并且 Hg ( 0.24 mg kg ? 2 )分别地是在广东省的土壤的相应重金属的背景内容的 1.82 和 2.82 次。有在附近的 3.4% Cu, 5.9% Ni, 1.7% Cd 和 28% Hg 在所有从有的所有调查地点收集了土壤样品溢出为为土壤标准的中国环境质量的重金属的内容(GB15618-1995,等级 II ) 。在土壤的多金属的污染特征被 Hg 主要反映。到在土壤的八个金属元素有不同来源, Cu, Zn, Ni, Cr 并且这是主要源于父母材料,并且 Pb, Hg 和 Cd 被人为的活动影响。空间分发表演 Cu, Zn, Ni, Cr, Pb 并且农业土壤的 Hg 内容在西方高并且在东方,和 Cd 内容低在西北高,东南并且在在 Dongguan 的西南低。Ni 的蔬菜样品的比率, Pb 并且作为比最大值高的集中,在食物(GB2762-2005 ) 的沾染物的层次分别地是 4.7% , 16.3% 和 48.8% 。在蔬菜的重金属的简历集中因素(BCF ) 的顺序是 Cd > Zn > Cu > 作为 > Ni > Hg > Cr > Pb。在 Dongguan 城市里从农业土壤和蔬菜为食物安全和人健康集中于重金属的潜在的风险是必要的,广东省。 | CAI Limei HUANG Lanchun ZHOU Yongzhang XU Zhencheng PENG Xiaochun YAO Ling'ai ZHOU Yang PENG Ping'an | 2010 | Journal of Geographical Sciences2010，20，1： | 23 |
| 3 | Distribution of polybrominated diphenyl ethers and decabromodiphenylethane in surface sediments from Fuhe River and Baiyangdian Lake,North China显示文摘Nineteen surface sediment samples collected from Baiyangdian Lake and its inflowing river (Fuhe River) in North China were analyzed for polybrominated diphenyl ethers (PBDEs) and decabromodiphenylethane (DBDPE).The concentrations of PBDEs and DBDPE in sediments ranged from 5.5 to 300.7 ng/g dry weight (dw) and 1.1 to 68.2 ng/g dw,respectively.Their levels in sediments in Fuhe River were significantly higher than those in Baiyandian Lake.Compared to data from other regions,the PBDE levels in surface sediments from Baiyangdian Lake and Fuhe River were in the medium to lower range.Among the PBDE congeners,BDE209 was predominant,with contributions to the total PBDEs ranging from 79.4% to 97.3% in sediment samples.For the lowly brominated congeners (tri-to hepta-BDE),BDE47 and BDE99 were the most abundant,which contributed 52.1% and 44.1% to the sum of tri-to hepta-BDEs in the sediments from Baiyangdian Lake and Fuhe River,respectively.The compositional patterns of PBDEs in Baiyangdian Lake sediments indicated that technical deca-BDE mixture was the major pollutant sources with a minor contribution of penta-BDE mixture.The present study suggested that the importance of Fuhe River as a possibly potential sources of PBDEs contamination in Baiyangdian Lake. | Guocheng Hu Zhencheng Xu Jiayin Dai Bixian Mai Hong Cao Jianshe Wang Zhimin Shi Muqi Xu | 2010 | Journal of Environmental Sciences2010，22，12： | 18 |
| 4 | Isolation and characterization of Sporobolomyces sp. LF1 capable of degrading chlorimuron-ethyl显示文摘A yeast strain which was capable of degrading sulfonylurea herbicide chlorimuron-ethyl named as LF1 was isolated from a chlorimuron-ethyl contaminated soil near the warehouse of the factory producing chlorimuron-ethyl in Shenyang City,Northeast China. The strain was identified as Sporobolomyces sp.,based on its morphological and physiological characteristics and the phylogenetic analysis of 18S rRNA gene sequence.So far,this is the only yeast strain of Sporobolomyces sp.which is able to degrade chlorimuron-ethyl.Incubation tests showed that when the initial concentration of chlorimuron-ethyl in culture was 5 mg/L,LF1 could degrade more than 77%of the herbicide after incubation for 4 d at 30°C.The possible mechanism of chlorimuron-ethyl degradation by LF1 could be the acidic hydrolysis caused by the acids from the metabolism of the yeast strain.Further study should be conducted to examine the pathways of chlorimuron-ethyl degradation by LF1 and to approach the feasibility of using LF1 to degrade the chlorimuron-ethyl in soil system. | ZHANG Xiaoli ZHANG Huiwen LI Xu SU Zhencheng WANG Jingjing ZHANG Chenggang | 2009 | Journal of Environmental Sciences2009，21，9： | 10 |
| 5 | Airborne PCDD/Fs in two e-waste recycling regions after stricter environmental regulations显示文摘Since the 2010 s, the authorities of Guangdong province and local governments have enhanced law enforcement and environmental regulations to abolish open burning, acid washing, and other uncontrolled e-waste recycling activities. In this study, ambient air and indoor dust near different kinds of e-waste recycling processes were collected in Guiyu and Qingyuan to investigate the pollution status of particles and polychlorinated dibenzo-pdioxins and furans(PCDD/Fs) after stricter environmental regulations. PM_(2.5) and PCDD/Fs both showed significantly reduced levels in the two regions compared with the documented data. The congener distribution and principal component analysis results also confirmed the significant differences between the current PCDD/Fs pollution characterizations and the historical ones. The estimated total intake doses via air inhalation and dust ingestion of children in the recycling region of Guiyu ranged from 10 to 32 pg TEQ/(kg·day), which far exceeded the tolerable daily intake(TDI) limit(1–4 pg TEQ/(kg·day). Although the measurements showed a significant reduction of the release of PCDD/Fs, the pollution status was still considered severe in Guiyu town after stricter regulations were implemented. | Manwen Zhang Guixian Feng Wenhua Yin Bing Xie Mingzhong Ren Zhencheng Xu Sukun Zhang Zongwei Cai | 2017 | Journal of Environmental Sciences2017，29，12： | 5 |
| 6 | WheatGmap:a comprehensive platform for wheat gene mapping and genomic studies显示文摘Bulked segregant analysis(BSA)is an efficient and low-cost strategy that is widely used to identify causal genes in segregating populations.BSA-based methods,such as BSA sequencing(Wenger et al.,2010),bulked segregant RNA sequencing(BSR-seq)(del Viso et al.,2012),and MutMap(Abe et al.,2012),are powerful tools that can be used for rapidly discovering genetic markers and gene mapping.Although BSA is increasingly being used in wheat(Triticum aestivum)gene mapping efforts,few user-friendly BSA tools have been developed for researchers lacking a strong bioinformatics background.Here,we developed the web-based BSA platform WheatGmap(https://www.wheatgmap.org),which integrates multiple BSA mapping models and large amounts of public data to accelerate gene cloning and functional research and facilitate resource sharing. | Lichao Zhang Chunhao Dong Zhongxu Chen Lixuan Gui Cheng Chen Danping Li Zhencheng Xie Qiang Zhang Xueying Zhang Chuan Xia Xu Liu Xiuying Kong Jirui Wang | 2021 | Molecular Plant2021，14，2： | 4 |
| 7 | Removal efficiency of the constructed wetland wastewater treatment system at Bainikeng, Shenzhen显示文摘 | Yang Yang Xu Zhencheng Hu Kangping | 1995 | Water Science and Technology1995，32，3： | 1 |
| 8 | Rapid magnetic removal of aqueous heavy metals and their relevant mechanisms using nanoscale zero valent iron (nZVI) particles显示文摘 | Pengpeng Huang Zhengfang Ye Wuming Xie Qi Chen Jing Li Zhencheng Xu Maosheng Yao | 2013 | Water Research2013，，12： | 1 |
| 9 | Variation trends and influencing factors of total gaseous mercury in the Pearl River Delta—A highly industrialised region in South China influenced by seasonal monsoons显示文摘 | Laiguo Chen Ming Liu Zhencheng Xu Ruifang Fan Jun Tao Duohong Chen Deqiang Zhang Donghai Xie Jiaren Sun | 2013 | Atmospheric Environment2013，，： | 1 |
| 10 | Atorvastatin Attenuates TNF-α–induced Increase of Glucose Oxidation Through PGC-1α Upregulation in Cardiomyocytes显示文摘 | Feng Gao Yinxing Ni Zhidan Luo Yi Liang Zhencheng Yan Xingsen Xu Daoyan Liu Jiang Wang Shanjun Zhu Zhiming Zhu | 2012 | Journal of Cardiovascular Pharmacology2012，，6： | 1 |
| 11 | Synthesis of surface sulfated BiWO with enhanced photocatalytic performance显示文摘Sulfated BiWO(SBiWO)was synthesized by an impregnation method to enhance the visible-light-driven photoactivities of BiWO(BiWO).The characterization results verified that sulfate anion mainly anchored on the catalyst surface greatly extended the visiblelight-responsive range without destroying the crystal lattice.Moreover,the SBiWO-based photoactivities were evaluated with the removal of Malachite Green(MG)under UV-Vis irradiation emitted from two microwave-powered electrodeless discharge lamps(MPEDL-2)and under visible light(λ>420nm).The results demonstrated that the kinetic constant was increased 2.25 times,varying from 0.1478(BiWO)to 0.3328min-1(SBiWO-1).Similar results were also obtained for the visible light-driven reaction.Furthermore,radical scavengers such as t-butanol restricted the visible-light induced degradation of MG over BiWO and SBiWO-1.This indicated that the sulfating process increased the generation of reactive oxygen species,which was further verified by molecular probe with salicylic acid.Thus,more blue-shifting at λ=618nm was observed over SBiWO.On the basis of the above results,the photocatalytic mechanism over the sulfated catalyst was also discussed. | Yongming Ju Jianming Hong Xiuyu Zhang Zhencheng Xu Dongyang Wei Yanhong Sang Xiaohang Fang Jiande Fang Zhenxing Wang | 2012 | Journal of Environmental Sciences2012，24，12： | 1 |
| 12 | Development of a novel conductance-based technology for environmental bacterial sensing显示文摘In this study, a simple impedance based technology for measuring bacterial concentrations was developed. The measurement system includes the signal amplification, copper probes and a sample loader. During the experiments, the conductance of Bacillus subtilis var niger, Pseudomonas fluorescens, and Escherichia coli were measured using the combination of a pre-amplifier and a lock-in amplifier. The conductance data were modeled verses the bacterial concentrations. Results indicated that the relationship between the conductance of bacterial suspensions and their concentrations follows a generic model: Y=C1+C2×e ( X/C3 ) , where Y is the conductance (S), X is the bacterial concentration (Number/mL: abbreviated to N/mL) for all species tested, and C1 3 are constants. Gram negative P. fluorescens and E. coli assumed similar conductance curves, which were flatter than that of gram positive B. subtilis var niger. For P. fluorescens and E. coli the culturing technique resulted in higher concentration levels (statistically significant) from 2 to 4 times that measured by the impedance based technology. For B. subtilis var niger, both methods resulted in similar concentration levels. These differences might be due to membrane types, initial culturability and the obtained conductance curves. The impedance based technology here was shown to obtain the bacterial concentration instantly, holding broad promise in realtime monitoring biological agents. | SHEN FangXia TAN MiaoMiao XU Hong XU ZhenCheng YAO MaoSheng | 2013 | Chinese Science Bulletin2013，58，4： | 1 |
| 13 | A time-stratified case-crossover study of fine particulate matter air pollution and mortality in Guangzhou, China显示文摘 | Chunxue Yang Xiaowu Peng Wei Huang Renjie Chen Zhencheng Xu Bingheng Chen Haidong Kan | 2012 | International Archives of Occupational and Environmental Health2012，，5： | 1 |
| 14 | In-and out- door sources of polybrominated diphenyl ethers and their hu- man inhalation exposure in Guangzhou, China显示文摘 | Chen Laiguo Mai Bixian Xu Zhencheng | 2008 | Atmo- spheric Environment2008，42，1： | 1 |
| 15 | Bioaecumulation behavior of polybrominated dipbenyl ethers ( PBDEs ) in the freshwater food chain of B aiyangdian lake, north China显示文摘 | HU Guocheng DAI Jiayin XU Zhencheng | 2010 | Environ Intern2010，36，4： | 1 |
| 16 | Design and performance of the LLRF control system for CSNS linac显示文摘Objective The China Spallation Neutron Source(CSNS)linac is designed with beam energy of 80 MeV and a peak current of 15 mA in the first phase.It consists of RFQ,two bunchers of medium-energy beam transmission line,four DTL tanks and one debuncher of linac-to-ring beam transmission line.Correspondingly,eight online RF power sources are used to power these accelerators.In order to stabilize the amplitude,phase and resonant frequency of the RF accelerating field,and minimize beam loss,we have established digital low-level RF(LLRF)control system.Methods The LLRF system includes RF reference line,analog module(AM),clock distribution module,digital control module(DCM),high-power protection module,timing and RF interlock module and so on.The DCM is mainly responsible for the stability of the RF field amplitude and phase,and RF interlock module can quickly cut off the RF drive in case of arc in the RF transmission system,VSWR over threshold or cavity vacuum fault and so on.Result During beam commissioning,all of eight online units of LLRF control system were operating stably and reliably.The amplitude and phase variations of the linac fields have been achieved about±0.4%and±0.15°with 10-mA beam loading,much better than the design requirements of±1%in amplitude and±1°in phase.Conclusion With the help of this system,we achieved stable operation under different beam loads.Also,many important progresses have been achieved in the LLRF control system for amore convenient operation and a higher stability performance.This article describes the design and implementation of the LLRF for CSNS linac. | Linyan Rong Zhencheng Mu Jian Li Zhexin Xie Wenzhong Zhou Bo Wang Maliang Wan Meifei Liu Xinan Xu | 2020 | Radiation Detection Technology and Methods2020，4，2： | 1 |
| 17 | Bioaccumulation behavior of polybrominated diphenyl ethers ( PBDEs ) in the freshwater food chain of Baiyangdian Lake, north China 显示文摘 | HU Guocheng DAI Jiayin XU Zhencheng | 2010 | Environ Intern2010，36，4： | 1 |
| 18 | Spatial trend and pollution assessment of total mercury and methylmercury pollution in the Pearl River Delta soil,South China显示文摘 | CHEN Laiguo XU Zhencheng DING Xiaoyong | 2012 | Chemosphere2012，88，： | 1 |
| 19 | In- and outdoor sources of polybrominated diphenyl ethers and their human inhalation exposure in Guangzhou, China显示文摘 | Laiguo Chen Bixian Mai Zhencheng Xu Xiaochun Peng Jinglei Han Yong Ran Guoying Sheng Jiamo Fu | 2007 | Atmospheric Environment2007，，1： | 1 |
| 20 | Development of Disposable Amperometric Cholesterol Biosensor显示文摘A novel disposable cholesterol biosensor based on electrochemical process is developed adopting screen printing technology.The system consists of a graphite reference electrode and a working electrode.The mixture of cholesterol oxidase and K_4Fe (CN)_6 is printed on the electrodes.The biosensor determines total cholesterol content through indirect determination of free cholesterol in the whole human blood.When 0.3V voltage is applied to the electrodes,the range of detection is from 250 mg/L to 2000 mg/L,with the correlation coefficient of 0.9967.The total detective duration is less than 200s,and the sample volume is only 4μL. | Xiaohao Wang Fei Tang Xiaowen Xu Zhencheng Chen | 2006 | 稀有金属材料与工程2006，35，A03： | 0 |
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