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| 1 | Relative Contributions of Boundary-Layer Meteorological Factors to the Explosive Growth of PM2.5 during the Red-Alert Heavy Pollution Episodes in Beijing in December 2016显示文摘Based on observations of urban mass concentration of fine particulate matter smaller than 2.5 μm in diameter(PM_(2.5)), ground meteorological data, vertical measurements of winds, temperature, and relative humidity(RH), and ECMWF reanalysis data, the major changes in the vertical structures of meteorological factors in the boundary layer(BL) during the heavy aerosol pollution episodes(HPEs) that occurred in winter 2016 in the urban Beijing area were analyzed. The HPEs are divided into two stages: the transport of pollutants under prevailing southerly winds, known as the transport stage(TS), and the PM_(2.5) explosive growth and pollution accumulation period characterized by a temperature inversion with low winds and high RH in the lower BL, known as the cumulative stage(CS). During the TS, a surface high lies south of Beijing, and pollutants are transported northwards. During the CS, a stable BL forms and is characterized by weak winds, temperature inversion, and moisture accumulation. Stable atmospheric stratification featured with light/calm winds and accumulated moisture(RH > 80%) below 250 m at the beginning of the CS is closely associated with the inversion, which is strengthened by the considerable decrease in near-surface air temperature due to the interaction between aerosols and radiation after the aerosol pollution occurs. A significant increase in the PLAM(Parameter Linking Aerosol Pollution and Meteorological Elements) index is found, which is linearly related to PM mass change. During the first 10 h of the CS, the more stable BL contributes approximately 84% of the explosive growth of PM_(2.5) mass. Additional accumulated near-surface moisture caused by the ground temperature decrease, weak turbulent diffusion, low BL height, and inhibited vertical mixing of water vapor is conducive to the secondary aerosol formation through chemical reactions, including liquid phase and heterogeneous reactions, which further increases the PM_(2.5) concentration levels. The contribution of these reaction mechanisms to the explosive growth of PM_(2.5) mass during the early CS and subsequent pollution accumulation requires further investigation. | junting zhong xiaoye zhang yaqiang wang junying sun yangmei zhang jizhi wang kaiyan tan xiaojing shen haochi che lu zhang zhouxiang zhang xuefei qi huarong zhao sanxue ren yang li | 2017 | Journal of Meteorological Research2017，31，5： | 25 |
| 2 | Trace metals in atmospheric fine particles in one industrial urban city: Spatial variations, sources, and health implications显示文摘Trace metals in PM2.5were measured at one industrial site and one urban site during September, 2010 in Ji'nan, eastern China. Individual aerosol particles and PM2.5samples were collected concurrently at both sites. Mass concentrations of eleven trace metals(i.e., Al, Ti, Cr, Mn, Fe, Ni, Cu, Zn, Sr, Ba, and Pb) and one metalloid(i.e., As) were measured by inductively coupled plasma atomic emission spectroscopy(ICP-AES). The result shows that mass concentrations of PM2.5(130 μg/m3) and trace metals(4.03 μg/m3) at the industrial site were 1.3 times and 1.7 times higher than those at the urban site, respectively, indicating that industrial activities nearby the city can emit trace metals into the surrounding atmosphere. Fe concentrations were the highest among all the measured trace metals at both sites, with concentrations of 1.04 μg/m3at the urban site and 2.41 μg/m3at the industrial site, respectively. In addition, Pb showed the highest enrichment factors at both sites, suggesting the emissions from anthropogenic activities existed around the city. Correlation coefcient analysis and principal component analysis revealed that Cu, Fe, Mn, Pb, and Zn were originated from vehicular trafc and industrial emissions at both sites; As, Cr, and part of Pb from coal-fired power plant; Ba and Ti from natural soil. Based on the transmission electron microscopy analysis, we found that most of the trace metals were internally mixed with secondary sulfate/organic particles. These internally mixed trace metals in the urban air may have diferent toxic abilities compared with externally mixed trace metals. | Shengzhen Zhou Qi Yuan Weijun Li Yaling Lu Yangmei Zhang Wenxing Wang | 2014 | Journal of Environmental Sciences2014，26，1： | 23 |
| 3 | Seasonal characterization of components and size distributions for submicron aerosols in Beijing显示文摘Submicron aerosols(PM1)in Beijing were studied using an Aerodyne aerosol mass spectrometer(AMS)from January to October 2008.This paper presents seasonal variations of different chemical components(sulfate,nitrate,ammonium,chloride and organics)and size distributions of PM1.Results show that mass concentration of PM1 was highest in summer,and lowest in autumn.Organics represented the dominant species in all seasons,accounting for 36%-58%of PM1,and their concentrations were highest in winter.Concentrations of inorganic components,sulfate,nitrate,and ammonium were highest in summer. Based on principal component analysis,organics were deconvolved and quantified as hydrocarbon-like and oxygenated organic aerosol(HOA and OOA,respectively).HOA was highest in winter,accounting for about 70%of organics.However,OOA was highest in summer,and had lower values in autumn and winter.A similar diurnal pattern of various components was ob- served,which is higher at nighttime and lower during daytime.HOA increased more dramatically than other species between 17:00 and 21:00 and peaked at noon,which could be related to cooking emissions. OOA,sulfate,nitrate,ammonium and chloride varied with the same trend.Their concentrations increased with solar radiation from 9:00 to 13:00,and declined with weakening solar radiation.Size distributions of all species showed apparent peaks in the range 500-600 nm.Size distributions of organics were much broader than other species,particularly in autumn and winter.Distributions of sulfate,nitrate and ammonium had similar patterns,broadening in winter.Contributions of different species were size-dependent;the finer the particle,the greater the contribution of organics.Organics represented more than 60%of particles smaller than 200 nm,contributing 50%to PM1 in winter.In spring and summer,HOA was the dominant organic fraction for particles smaller than 200 nm, while OOA contributed more to particles larger than 300 nm.In winter,HOA contributed more than OOA to all PM1 particles. | ZHANG YangMei SUN JunYing ZHANG XiaoYe SHEN XiaoJing WANG TingTing QIN MingKai | 2013 | Science China Earth Sciences2013，56，5： | 14 |
| 4 | Nitrification potentials of Chinese tea orchard soils and their adjacent wasteland and forest soils显示文摘To investigate the nitrifying activities of different soil types,soil samples collected from 8-,50-and 90-year old tea orchards,the adjacent wasteland,and 90-year old forest were measured for their nitrification potentials using the conventional soil incubation and the liquid incubation method.Among different soil types,the nitrification potential of soil in tea orchards was higher than that of wasteland and forest soils.The slurry shaken liquid incubation method was confirmed to be more accurate and have reliable results than the soil incubation.Interestingly,experimental result revealed that the generally applied pH value of 7.2 for the liquid media was not the optimal pH for these acid soils with a strong buffer capacity.This suggested that tea orchard soils may have nitrifiers requiring pH-neutral condition for the best activity.Our data also showed that treatment with the commonly used nitrogen fertilizer urea significantly improved nitrification potential of the soils;such enhancement effect was stronger on all of three tea orchard soils than on wasteland and forest soils,and also stronger on the younger(8-and 50-year old) tea orchard soils than on the older one(90-year old) . | XUE Dong GAO Yangmei YAO Huaiying HUANG Changyong | 2009 | Journal of Environmental Sciences2009，21，9： | 12 |
| 5 | Aerosol Hygroscopicity during the Haze Red-Alert Period in December 2016 at a Rural Site of the North China Plain显示文摘A humidification system was deployed to measure aerosol hygroscopicity at a rural site of the North China Plain during the haze red-alert period 17–22 December 2016. The aerosol scattering coefficients under dry [relative humidity(RH) < 30%] and wet(RH in the range of 40%–85%) conditions were simultaneously measured at wavelengths of450, 550, and 700 nm. It is found that the aerosol scattering coefficient and backscattering coefficient increased by only 29% and 10%, respectively when RH went up from 40% to 80%, while the hemispheric backscatter fraction went down by 14%, implying that the aerosol hygroscopicity represented by the aerosol scattering enhancement factor f(RH) is relatively low and RH exerted little effects on the aerosol light scattering in this case. The scattering enhancement factors do not show significant differences at the three wavelengths, only with an approximate 2% variation, suggesting that the aerosol hygroscopicity is independent of the wavelength. Aerosol hygroscopicity is highly dependent on the aerosol chemical composition. When there is a large mass fraction of inorganics and a small mass fraction of organic matter, f(RH) reaches a high value. The fraction of NO_3^- was strongly correlated with the aerosol scattering coefficient at RH = 80%, which suggests that NO_3^- played an important role in aerosol hygroscopic growth during the heavy pollution period. | Xuefei QI Junying SUN Lu ZHANG Xiaojing SHEN Xiaoye ZHANG Yangmei ZHANG Yaqiang WANG Haochi CHE Zhouxiang ZHANG Junting ZHONG Kaiyan TAN Huarong ZHAO Sanxue REN | 2018 | Journal of Meteorological Research2018，32，1： | 7 |
| 6 | Key features of new particle formation events at background sites in China and their influence on cloud condensation nuclei显示文摘 | Xiaojing SHEN Junying SUN Xiaoye ZHANG Yangmei ZHANG Lu ZHANG Ruxia FAN | 2016 | Frontiers of Environmental Science & Engineering2016，10，5： | 5 |
| 7 | Chemical Components, Variation, and Source Identification of PM1 during the Heavy Air Pollution Episodes in Beijing in December 2016显示文摘Air pollution is a current global concern. The heavy air pollution episodes(HPEs) in Beijing in December 2016 severely influenced visibility and public health. This study aims to survey the chemical compositions, sources, and formation processes of the HPEs. An aerodyne quadruple aerosol mass spectrometer(Q-AMS) was utilized to measure the non-refractory PM1(NR-PM1) mass concentration and size distributions of the main chemical components including organics, sulfate, nitrate, ammonium, and chloride in situ during 15–23 December 2016. The NR-PM1 mass concentration was found to increase from 6 to 188 μg m–3 within 5 days. During the most serious polluted episode, the PM1 mass concentration was about 2.6 times that during the first pollution stage and even 40 times that of the clean days. The formation rates of PM2.5 in the five pollution stages were 26, 22, 22, 32, and 67 μg m^(–3) h–1, respectively. Organics and nitrate occupied the largest proportion in the polluted episodes, whereas organics and sulfate dominated the submicron aerosol during the clean days. The size distribution of organics is always broader than those of other species, especially in the clean episodes. The peak sizes of the interested species grew gradually during different HPEs. Aqueous reaction might be important in forming sulfate and chloride, and nitrate was formed via oxidization and condensation processes. PMF(positive matrix factorization) analysis on AMS mass spectra was employed to separate the organics into different subtypes. Two types of secondary organic aerosol with different degrees of oxidation consisted of 43% of total organics. By contrast, primary organics from cooking, coal combustion, and traffic emissions comprised 57% of the organic aerosols during the HPEs. | Yangmei ZHANG Yaqiang WANG Xiaoye ZHANG Xiaojing SHEN Junying SUN Lingyan WU Zhouxiang ZHANG Haochi CHE | 2018 | Journal of Meteorological Research2018，32，1： | 4 |
| 8 | Associations of noniodized salt and thyroid nodule among the Chinese population: a large cross-sectional study1234显示文摘 | Zexin Chen Weimin Xu Yangmei Huang Xingyi Jin Jin Deng Sujuan Zhu Hui Liu Shanchun Zhang Yunxian Yu | 2013 | American Journal of Clinical Nutrition2013，，3： | 3 |
| 9 | 晋华炉气化技术工业装置运行总结显示文摘通过对晋华炉装置工艺流程、技术特点、开车情况、运行情况的描述,指出晋华炉装置运行后有非常明显的经济效益、社会效益。 | Shanxi Yangmei Fengxi Fertilizer Industry(Group)Co.,Ltd. | 2016 | 氮肥技术2016，37，6： | 2 |
| 10 | SFRP5 inhibits melanin synthesis of melanocytes in vitiligo by suppressing the Wnt/b-catenin signaling显示文摘Secreted frizzled-related protein 5(SFRP5)plays a pivotal role in regulating the development of many tissues and organs,however,as an inhibitor of Wnt signaling,the role of SFRP5 in vitiligo remains unknown.Hence,we speculated that SFRP5 might be associated with melanogenesis in melanocytes by regulating Wnt signaling in vitiligo.In this study,we found that SFRP5 was overexpressed in the skin lesions of patients with vitiligo.Compared with that in normal epidermal melanocytes(PIG1),the expression of SFRP5 was increased in vitiligo melanocytes(PIG3V).To investigate the effect of SFRP5 on melanin synthesis,PIG1 cells were infected with recombinant SFRP5 adenovirus(AdSFRP5),and PIG3V cells were infected with recombinant siSFRP5 adenovirus(AdsiSFRP5).The results showed that SFRP5 overexpression inhibited melanin synthesis in PIG1 cells through downregulation of microphthalmia-associated transcription factor(MITF)and its target proteins via suppression of the Wnt/b-catenin signaling pathway.Accordingly,SFRP5 silencing increased melanin synthesis and activated the Wnt signaling pathway in PIG3V cells.Moreover,SFRP5 overexpression also downregulated the transcriptional activity of T cell factor/lymphoid enhancer factor(TCF/LEF)in PIG1 cells.Furthermore,this inhibitory effect of SFRP5 on melanin synthesis was reversed by treatment with the b-catenin agonist,SKL2001.The inhibitory action of SFRP5 in pigmentation was further confirmed in vivo using a nude mouse model.Hence,our results indicate that SFRP5 can inhibit melanogenesis in melanocytes.Additionally,our findings showed that SFRP5 plays a vital role in the development of vitiligo,and thus may serve as a potential therapeutic target for vitiligo. | Daopei Zou Yangmei Chen Lingzhao Zhang Xiaohui Yuan Yujie Zhang Adelina Inggawati Pham Thi Kieu Nguyet Tianwen Gao Jin Chen | 2021 | Genes & Diseases2021，8，5： | 2 |
| 11 | Robust prediction of hourly PM_(2.5) from meteorological data using LightGBM显示文摘Retrieving historical fine particulate matter(PM_(2.5))data is key for evaluating the long-term impacts of PM_(2.5) on the environment,human health and climate change.Satellite-based aerosol optical depth has been used to estimate PM_(2.5),but estimations have largely been undermined by massive missing values,low sampling frequency and weak predictive capability.Here,using a novel feature engineering approach to incorporate spatial effects from meteorological data,we developed a robust Light GBM model that predicts PM_(2.5) at an unprecedented predictive capacity on hourly(R^(2)=0.75),daily(R^(2)=0.84),monthly(R^(2)=0.88)and annual(R^(2)=0.87)timescales.By taking advantage of spatial features,our model can also construct hourly gridded networks of PM_(2.5).This capability would be further enhanced if meteorological observations from regional stations were incorporated.Our results show that this model has great potential in reconstructing historical PM_(2.5) datasets and real-time gridded networks at high spatial-temporal resolutions.The resulting datasets can be assimilated into models to produce long-term re-analysis that incorporates interactions between aerosols and physical processes. | Junting Zhong Xiaoye Zhang Ke Gui Yaqiang Wang Huizheng Che Xiaojing Shen Lei Zhang Yangmei Zhang Junying Sun Wenjie Zhang | 2021 | National Science Review2021，8，10： | 2 |
| 12 | A Study on the Biocompatibility of MgO Coating Prepared by Anodic Oxidation Method on Magnesium Metal显示文摘Magnesium(Mg),is widely used for the bone repair in oral and orthopedic application due to excellent bioactivity,degradation and biocompatibility.However,the range of application is greatly limited because of the rapid degradation of Mg metal in the body.Surface modification is an effective method to enhance the corrosion resistance and reduce the degradation rate of Mg metal.In the present study,pure Mg metal(P-Mg)was subjected to alkali-heat treatment(AT-Mg)or anodic oxidation-heat treatment(AO-HT-Mg).Both AT-Mg and AO-HT-Mg had a layer of MgO on their surfaces after treatment.Then the effects of MgO coating on corrosion resistance,bioactivity,Mesenchymal Stem Cells’(MSCs)proliferation,adhesion and osteogenic differentiation,and the bone repair capability of Mg metal were investigated.We found both AT-Mg and AO-HT-Mg had stronger corrosion resistance than P-Mg.MSCs on both AT-Mg and AO-HT-Mg had higher expression of proteins and genes of ALP,OCN,Col-I and Runx2 than those on P-Mg.They also showed better bone repair property than P-Mg in vivo.In general,MgO layer formed by anodic oxidation-heat treatment had better resistance and biocompatibility than that produced by alkali-heat treatment.This study indicated the MgO coating not only improved the corrosion resistance of Mg metal,but also promoted the osteogenic differentiation of MSCs and bone regeneration. | Yangmei Chen Xugang Lu Fenghua Zhao Yi Hu Shibing Xiong Yuqiang Guo Ping Huang Bangcheng Yang | 2020 | Journal of Bionic Engineering2020，17，1： | 2 |
| 13 | Comparison of Submicron Particles at a Rural and an Urban Site in the North China Plain during the December 2016 Heavy Pollution Episodes显示文摘An extensive field experiment for measurement of physical and chemical properties of aerosols was conducted at an urban site in the Chinese Academy of Meteorological Sciences(CAMS) in Beijing and at a rural site in Gucheng(GC), Hebei Province in December 2016. This paper compares the number size distribution of submicron particle matter(PM1, diameter < 1 μm) between the two sites. The results show that the mean PM1 number concentration at GC was twice that at CAMS, and the mass concentration was three times the amount at CAMS. It is found that the accumulation mode(100–850 nm) particles constituted the largest fraction of PM1 at GC, which was significantly correlated with the local coal combustion, as confirmed by a significant relationship between the accumulation mode and the absorption coefficient of soot particles. The high PM1 concentration at GC prevented the occurrence of new particle formation(NPF) events, while eight such events were observed at CAMS. During the NPF events, the mass fraction of sulfate increased significantly, indicating that sulfate played an important role in NPF. The contribution of regional transport to PM1 mass concentration was approximately 50% at both sites, same as that of the local emission. However, during the red-alert period when emission control took place, the contribution of regional transport was notably higher. | Xiaojing SHEN Junying SUN Xiaoye ZHANG Yangmei ZHANG Yaqiang WANG Kaiyan TAN Peng WANG Lu ZHANG Xuefei QI Haochi CHE Zhouxiang ZHANG Junting ZHONG Huarong ZHAO Sanxue REN | 2018 | Journal of Meteorological Research2018，32，1： | 2 |
| 14 | Process operation performance of PDMS membrane pervaporation coupled with fermentation for efficient bioethanol production显示文摘There would be strong product inhibition on ethanol fermentation process if ethanol is not removed in situ from broth. PDMS membrane pervaporation coupled with fermentation is a promising process for efficient bioethanol production since ethanol inhibition is relieved or eliminated. From the perspective of process operation, membrane separation performance, ethanol fermentation performance and the subsequent processing on membrane downstream are the three key issues. This review aims at contributing a comprehensive overview on the operation performance of the integrated process. The state-of-the-art of the three key issues related to the operation performance is focused. Finally, the tentative perspective on the possible future prospects of the integrated process is briefly presented. | Senqing Fan Jingyun Liu Xiaoyu Tang Wenguo Wang Zeyi Xiao Boya Qiu YuyangWang Shizhao Jian Yangmei Qin Yinan Wang | 2019 | Chinese Journal of Chemical Engineering2019，27，6： | 2 |
| 15 | ADMETNet:The knowledge base of pharmacokinetics and toxicology network显示文摘A good drug or drug candidate should not only interact with its target molecule effectively and specifically,but also be absorbed into the body,distributed to the right location,metabolized into right compounds,and eliminated out of the body in proper manner.The processes of drug getting into and out of the body involve Absorption,Distribution,Metabolism,and Excretion(ADME),which | Quan Xu Ke Liu Xingming Lin Yangmei Qin Linshan Chen Jiao Cheng Mindong Zhong Qiushun He Yinbo Li Tingwu Wang Jianbo Pan Menglu Peng Lixia Yao Zhiliang Ji | 2017 | Journal of Genetics and Genomics2017，44，5： | 2 |
| 16 | Simulating Aerosol Size Distribution and Mass Concentration with Simultaneous Nucleation,Condensation/Coagulation, and Deposition with the GRAPES–CUACE显示文摘A coupled aerosol–cloud model is essential for investigating the formation of haze and fog and the interaction of aerosols with clouds and precipitation. One of the key tasks of such a model is to produce correct mass and number size distributions of aerosols. In this paper, a parameterization scheme for aerosol size distribution in initial emission,which took into account the measured mass and number size distributions of aerosols, was developed in the GRAPES–CUACE [Global/Regional Assimilation and Pr Ediction System–China Meteorological Administration(CMA) Unified Atmospheric Chemistry Environment model]—an online chemical weather forecast system that contains microphysical processes and emission, transport, and chemical conversion of sectional multi-component aerosols. In addition, the competitive mechanism between nucleation and condensation for secondary aerosol formation was improved, and the dry deposition was also modified to be in consistent with the real depositing length. Based on the above improvements, the GRAPES–CUACE simulations were verified against observational data during 1–31 January 2013, when a series of heavy regional haze–fog events occurred in eastern China. The results show that the aerosol number size distribution from the improved experiment was much closer to the observation, whereas in the old experiment the number concentration was higher in the nucleation mode and lower in the accumulation mode. Meanwhile, the errors in aerosol number size distribution as diagnosed by its sectional mass size distribution were also reduced. Moreover, simulations of organic carbon, sulfate, and other aerosol components were improved and the overestimation as well as underestimation of PM2.5 concentration in eastern China was significantly reduced,leading to increased correlation coefficient between simulated and observed PM2.5 by more than 70%. In the remote areas where bad simulation results were produced previously, the correlation coefficient grew from 0.35 to 0.61, and the mean mass concentration went up from 43% to 87.5% of the observed value. Thus, the simulation of particulate matters in these areas has been improved considerably. | Chunhong ZHOU Xiaojing SHEN Zirui LIU Yangmei ZHANG Jinyuan XIN | 2018 | Journal of Meteorological Research2018，32，2： | 1 |
| 17 | Atmospheric Particle Hygroscopicity and the Influence by Oxidation State of Organic Aerosols in Urban Beijing显示文摘A hygroscopic tandem differentialmobility analyser(H-TDMA)was used to observe the sizeresolved hygroscopic characteristics of submicron particles in January and April 2018 in urban Beijing.The probability distribution of the hygroscopic growth factor(HGF-PDF)in winter and spring usually showed a bimodal pattern,with more hygroscopic mode(MH)being more dominant.The seasonal variation in particle hygroscopicity was related to the origin of air mass,which received polluted southerly air masses in spring and clean northwesterly air masses in winter.Particles showed stronger hygroscopic behaviour during heavy pollution episodes(HPEs)with elevated concentrations of secondary aerosols,especially higher mass fraction of nitrate,which were indicated using the PM2.5(particulate matter with diameter below 2.5μm)mass concentration normalised by CO mass concentration.The hygroscopic parameter(κ)values were calculated using H-TDMA(κhtdma)and chemical composition(κchem).The closure study showed thatκchem was overestimated in winter afternoon when compared withκhtdma,because the organic particle hygroscopic parameter(κorg)was overestimated in the calculations.It was influenced by the presence of a high concentration of hydrocarbon-like organic aerosol(HOA)with a weak water uptake ability.A positive relationship was observed betweenκorg and the ratio of oxygenated organic aerosol(OOA)and HOA,thereby indicating that the strong oxidation state enhanced the hygroscopicity of the particles.This study revealed the effect of local emission sources and secondary aerosol formation processes on particle hygroscopicity,which is of great significance for understanding the pollution formation mechanism in the North China Plain. | Sinan Zhang Xiaojing Shen Junying Sun Yangmei Zhang Xiaoye Zhang Can Xia Xinyao Hu Junting Zhong Jialing Wang Shuo Liu | 2023 | Journal of Environmental Sciences2023，，2： | 1 |
| 18 | Two-step oxalate approach for the preparation of high performance LiNioeMnlO4 cathode material with high voltage显示文摘 | Zushan Liu Yangmei Jiang | 2014 | Joumal of Power Sources2014，247，： | 1 |
| 19 | Horseradish peroxidase biosensor based on layer-by-layer technique for the determination of phenolic compounds显示文摘 | YANG Shaoming LI Yangmei JIANG Xiuming | 2006 | Sens Actuators B2006，114，： | 1 |
| 20 | Metrological role of neutron activation analysis Ⅲ: Role of INAA in sampling behavior char- acterization显示文摘 | TIAN Weizhi NI Bangfa ZHANG Yangmei | 2002 | Accreditation and Quality Assur- ance2002，7，： | 1 |
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