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Numerical Simulations of an Advection Fog Event over Shanghai Pudong International Airport with the WRF Model

Journal of Meteorological Research 2017年第5期31卷 874-889页

作者： Caiyan LIN Zhongfeng ZHANG Zhaoxia PU fengyun wang Aviation Meteorological Center Air Traffic Management Bureau Civil Aviation Administration of China Department of Atmospheric Sciences University of Utah Meteorological Center East China Air Traffic Management BureauCivil Aviation Administration of China

A series of numerical simulations is conducted to understand the formation, evolution, and dissipation of an advec- tion fog event over Shanghai Pudong International Airport （ZSPD） with the Weather Research and Forecasting （WRF） model. Using the current operational settings at the Meteorological Center of East China Air Traffic Manage- ment Bureau, the WRF model successfully predicts the fog event at ZSPD. Additional numerical experiments are per- formed to examine the physical processes associated with the fog event. The results indicate that prediction of this particular fog event is sensitive to microphysical schemes for the time of fog dissipation but not for the time of fog onset. The simulated timing of the arrival and dissipation of the fog, as well as the cloud distribution, is substantially sensitive to the planetary boundary layer and radiation （both longwave and shortwave） processes. Moreover, varying forecast lead times also produces different simulation results for the fog event regarding its onset and duration, sug- gesting a trade-off between more accurate initial conditions and a proper forecast lead time that allows model physi- cal processes to spin up adequately during the fog simulation. The overall outcomes from this study imply that the complexity of physical processes and their interactions within the WRF model during fog evolution and dissipation is a key area of future research.

关键词： advection fog physical parameterization numerical prediction forecast lead time WRF model

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A New DS-SS Signal Detection Trial Algorithm for False Alarm Rejection Based on Motion Parameters Constraint

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Chinese Journal of Electronics 2015年第1期24卷 110-114页

作者： CUI Wei wang fengyun LI Zhenzhen JIN Qianyu ZHANG Yunhan Radar Research Laboratory School of Information and ElectronicsBeijing Institute of Technology

To reject false alarm, a new detection trial algorithm named motion parameters constraint for Direct sequence spread spectrum(DS-SS) signal is proposed. A mathematical model based on uniform motion between two adjacent detections is established to analyze the overall performance of the proposed trial algorithm. Motion parameters constraint is applied to the conventional variable dwell time Tong trial algorithm. The expressions of the false alarm probability and detection probability are derived. Theoretical analysis and simulation results demonstrate that in comparison with the conventional M of N trial algorithm, Tong trial algorithm and Tong trial algorithm based on near neighbor constraint. The proposed trial algorithm can significantly reduce the false alarm probability and enhance the detection ability without increasing search speed and complexity.

关键词： DS-SS Acquisition Motion parameters constraint False alarm.

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Size control of monodisperse nonporous silica particles by seed particle growth

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Particuology 2011年第3期9卷 314-317页

作者： Beibei Zhao Caihua Tian Yan Zhang Tao Tang fengyun wang Institute of Industrial Chemistry Nanjing University of Science & Technology Nanjing 210094 China Dalian Elite Analytical Instrument Co. Ltd. Dalian 116011 China

Monodisperse nonporous silica particles were prepared by sol-precipitation via seed particle growth method, and the particle size, which varied from 1.0 to 4.7 μm, was strictly controlled in our experiment, The formation of secondary particles, which resulted in a multimodaI distribution of particle size, was suppressed by changing tetraethoxysilane （TEOS） concentration and reaction temperature. Furthermore, the effect of adding small amounts of electrolyte to the hydrolysis mixture was examined.

关键词： Silica particles Nonporous Monodisperse Micrometer

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Preparation of high-purity monodisperse silica microspheres by the sol-gel method coupled with polymerization-induced colloid aggregation

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Particuology 2015年第5期13卷 177-184页

作者： Beibei Zhao Yan Zhang Tao Tang fengyun wang Tong Li Qiyu Lu College of Food Science and Technology Henan University of Technology Chemical Engineering Institute Nanjing University of Science and Technology Dalian Elite Analytical Instruments Co. Ltd.

Ultra-pure mesoporous silica microspheres with good monodispersity were synthesized in two steps： nanometer-sized silica sol was produced by the sol-gel process, then micrometer-sized silica microspheres were synthesized by polymerization-induced colloid aggregation of the silica sol. The total metal content of the microspheres was extremely low, which eliminated the tailing of chromatographic peaks by chelating reagents. The pore structure of the silica microspheres could be controlled by altering the sol-gel conditions. The silica microsphere particle size could be adjusted by using different polymerizationinduced colloid aggregation conditions.

关键词： Sol-gel Polymerization-induced colloid aggregation Silica High purity Monodisperse

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Impact of meteorological conditions on a nine-day particulate matter pollution event observed in December 2013,Shanghai,China

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Particuology 2015年第3期13卷 69-79页

作者： Jianming Xu Fengxia Yan Ying Xie fengyun wang Jianbin Wu Qingyan Fu Shanghai Meteorological Bureau Meteorological Center of Traffic Management Bureau of East China Shanghai Environmental Monitoring Center

A severe particulate matter pollution event occurred in Shanghai from 1 to 9 December 2013. The mean hourly mass concentrations of PM2.5 and PM10 were 211.9 and 249.0 μg/m3, respectively. Reanalysis data, in situ, and remote-sensing measurements were used to examine the impacts of meteorological conditions on this event. It was found that the synoptic pattern of weak pressure, the reduced planetary boundary layer height, and the passage of two cold fronts were key factors causing the event. Four stages were identified during this event based on the evolution of its PM2.5 levels and weather conditions. The highest concentration of PM2.5 （602 μg/m3） was observed in stage 3. High PM2.5 concentrations were closely associated with a low local ventilation index, with an average of 505 m2/s, as well as with the influx of pollutants from upstream, transported by the cold fronts.

关键词： Particulate matterPM2.5Pollution eventPlanetary boundary layerCold frontUrban air pollution

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Flexible Conductive Anodes Based on 3D Hierarchical Sn/NS-CNFs@rGO Network for Sodium-Ion Batteries

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Nano-Micro Letters 2019年第4期11卷 133-146页

作者： Linqu Luo Jianjun Song Longfei Song Hongchao Zhang Yicheng Bi Lei Liu Longwei Yin fengyun wang Guoxiu wang College of Physics and State Key Laboratory of Bio-Fibers and Eco-Textiles Qingdao UniversityQingdao 266071People’s Republic of China College of Electromechanical Engineering Qingdao University of Science and TechnologyNo.99 Songling RoadQingdao 260061ShandongPeople’s Republic of China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590People’s Republic of China School of Materials Science and Engineering Shandong UniversityJinan 250061People’s Republic of China Centre for Clean Energy Technology University of Technology SydneyBroadwaySydneyNSW 2007Australia

Metallic Sn has provoked tremendous progress as an anode material for sodium-ion batteries(SIBs).However,Sn anodes suffer from a dramatic capacity fading,owing to pulverization induced by drastic volume expansion during ***,a flexible three-dimensional(3D)hierarchical conductive network electrode is designed by constructing Sn quantum dots(QDs)encapsulated in one-dimensional N,S codoped carbon nanofibers(NS-CNFs)sheathed within two-dimensional(2D)reduced graphene oxide(rGO)*** this ingenious strategy,1D NS-CNFs are regarded as building blocks to prevent the aggregation and pulverization of Sn QDs during sodiation/desodiation,2D rGO acts as electrical roads and“bridges”among NS-CNFs to improve the conductivity of the electrode and enlarge the contact area with *** of the unique structural merits,the flexible 3D hierarchical conductive network was directly used as binder-and current collectorfree anode for SIBs,exhibiting ultra-long cycling life(373 mAh g?1 after 5000 cycles at 1 A g?1),and excellent high-rate capability(189 mAh g?1 at 10 A g?1).This work provides a facile and efficient engineering method to construct 3D hierarchical conductive electrodes for other flexible energy storage devices.

关键词： Flexible electrodes N S co-doped carbon nanofibers Reduced graphene oxide Sn quantum dots Sodium-ion batteries

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Corydalis Rhizoma as a model for herb-derived trace metabolites exploration:A cross-mapping strategy involving multiple doses and samples

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Journal of Pharmaceutical Analysis 2021年第3期11卷 308-319页

作者： Chanjuan Yu fengyun wang Xinyue Liu Jiayan Miao Siqi Tang Qin Jiang Xudong Tang Xiaoyan Gao School of Chinese Materia Medica Beijing University of Chinese MedicineBeijing102488PR China Gastroenterology Department Xiyuan HospitalChina Academy of Chinese Medical SciencesBeijing100091PR China

Deciphering the metabolites of multiple components in herbal medicine has far-reaching significance for revealing pharmacodynamic ***,most chemical components of herbal medicine are secondary metabolites with low content whose in vivo metabolites are close to trace amounts,making it difficult to achieve comprehensive detection and *** this paper,an efficient strategy was proposed:herb-derived metabolites were predicted according to the structural characteristics and metabolic reactions of chemical constituents in Corydalis Rhizoma and chemical structure screening tables for metabolites were *** fragmentation patterns were summarized from representative standards combining with specific cleavage behaviors to deduce structures of *** abundance plays an important role in compound identification,and high ion abundance can improve identification *** types of metabolites in different biological samples were very similar,but their ion abundance might be ***,for trace metabolites in biological samples,we used the following two methods to process:metabolites of high dose herbal extract were analyzed to characterize those of clinical dose herbal extracts in the same biological samples;cross-mapping of different biological samples was applied to identify trace metabolites based on the fact that a metabolite has different ion abundance in different biological *** with not using this strategy,44 more metabolites of clinical dose herbal extract were *** study improved the depth,breadth,and accuracy of current methods for herb-derived metabolites characterization.

关键词： Alkaloid Characteristic fragment Corydalis yanhusuo In vivo metabolism Metabolite

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Experiment on inducing apoptosis of melanoma cells by micro-plasma jet

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Nanotechnology and Precision Engineering 2024年第1期7卷 10-17页

作者： Hua Li Qihao Shi Yanhua Yang Jinghao Qi Yuhan Zhang fengyun wang Xiaoxia Du Wenxiang Xiao School of Life and Environmental Sciences GuiLin University of Electronic TechnologyGuilinGuangXi 541004People’s Republic of China The Guangxi Human Physiological Information Noninvasive Detection Engineering Technology Research Center GuilinGuangXi 541004People’s Republic of China Guilin URIT MEDICAL Electronic Sales Co. Ltd.GuilinGuangXi 541004People’s Republic of China

As a promising cancer treatment method,cold atmospheric plasma has received widespread attention in recent ***,previous research has focused more on how to realize and expand the anti-cancer scope of plasma *** are also studies on the killing of small-scale cancer cells,but the effects of plasma jet on normal cells and normal cell clusters have been ***,we proposed a 50μm sized micro-plasma jet device,and used the device to treat melanoma cells(A-375)and human glial cells(HA1800)to evaluate their anti-cancer effects and effects on normal *** experimental results show that this kind of micro-plasma jet device can effectively inactivate cancer cells in a short period of time,while having little effect on normal *** work provides a certain experimental basis for the application ofﬁne plasma jet to clinically inactivate cancer cells.

关键词： 3D cell clusters Micro-plasma jet Cancer therapy Reactive oxygen species Plasma direct treatment

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Effect of Chinese Herbal Medicines on Helicobacter pylori-associated gastroduodenal ulcers: a systematic review and Meta-analysis

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Journal of Traditional Chinese Medicine 2019年第4期39卷 459-465页

作者： Shi Xiaoshuang Wu Haomeng Ma Xiangxue Yin Xiaolan Li Xia Ma Jinxin wang fengyun Tang Xudong Graduate School Beijing University of Chinese MedicineNo.11Beisanhuandong RoadChaoyang DistrictBeijing 100029China Department of Gastroenterology Xiyuan HospitalChina Academy of Chinese Medical SciencesXiyuan RoadHaidian DistrictBeijing 100091China The Second Affiliated Hospital of Guangzhou University of Chinese Medicine 55 Neihuan XiluXiaoguwei StreetPanyu DistrictGuangzhou Higher Education Mega CenterGuangzhou 510006China

OBJECTIVE: To evaluate the effect and safety of Chinese herbal medicines on Helicobacter pylori(HP)-associated gastroduodenal ***: All randomized controlled trials(RCTs)listed in the PubMed, EMBASE, Cochrane Library,China National Knowledge Infrastructure Database,WanFang, China Science and Technology Journal Database and SinoMed databases that were published in English or Chinese were searched, and the retrieval time range was from database inception to December 31, 2018. A comprehensive Meta-analysis of all publications was performed with RevMan 5.3 software, and the quality of the evidence report-ed in the results of Meta-analysis was analyzed with GRADE profiler software(version 3.6.1). Dichotomous data were analyzed by calculating odds ratios and 95% confidence intervals(CIs). Outcome measures included the HP clearance rate and percentage of adverse ***: Eight trials with 919 participants were included in this Meta-analysis. Compared with the effects of single drug therapy on HP-associated gastroduodenal ulcers, according to the statistical analysis, odds ratios for the HP clearance rate and percentage of adverse effects of Chinese herbal medicines administered as complementary medicines combined with drugs were 3.10 [95% CI(2.21, 4.36),P < 0.01] and 0.28 [95% CI(0.15, 0.52), P < 0.01], respectively, and the differences were statistically significant. According to the GRADE analysis, the quality of evidence for the HP clearance rate and percentage of adverse effects were both very ***: Compared with using the drug therapy only, the combination of Chinese herbal medicines with the drug therapy more effectively eliminates HP and alleviates adverse reactions. However,the available studies were of low quality, and therefore more well-designed studies are required to further confirm the findings.

关键词： Peptic ulcer Helicobacter pylori Medicine,Chinese traditional Review Meta-analysis

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Dynamic modeling of hydrostatic guideway considering compressibility and inertia effect

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Frontiers of Mechanical Engineering 2015年第1期10卷 78-88页

作者： Yikang DU Kuanmin MAO Yaming ZHU fengyun wang Xiaobo MAO Bin LI School ofMechaniCsc alience and TechnologSy cience and Engineering Huazhong UniversitYwuh Ofan 430074 China State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China

Hydrostatic guideways are used as an alter- native to contact bearings due to high stiffness and high damping in heavy machine tools. To improve the dynamic characteristic of bearing structure, the dynamic modeling of the hydrostatic guidway should be accurately known. This paper presents a ＂mass-spring-Maxwell＂ model considering the effects of inertia, squeeze, compressibility and static bearing. To determine the dynamic model coefficients, numerical simulation of different cases between displacement and dynamic force of oil film are performed with fluent code. Simulation results show that hydrostatic guidway can be taken as a linear system when it is subjected to a small oscillation amplitude. Based on a dynamic model and numerical simulation, every dynamic model＇s parameters are calculated by the Levenberg- Marquardt algorithm. Identification results show that ＂mass-spring-damper＂ model is the most appropriate dynamic model of the hydrostatic guidway. This paper provides a reference and preparation for the analysis of the dynamic model of the similar hydrostatic bearings.

关键词： hydrostaticdynamic mesh technique,spring-damper modelguidway dynamicLevenberg-Marquardt,model mass-

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