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Study of aerosol characteristics and sources using MAX-DOAS measurement during haze at an urban site in the Fenwei Plain

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Journal of Environmental Sciences 2021年第9期33卷 1-13页

作者： Xiaomei Li Pinhua Xie Ang Li Jin Xu hongmei ren bo ren Yanyu Li Jie Li Key laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China CAS Center for Excellence in Urban Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China University of Chinese Academy of Sciences Beijing 100049China Institute of Atmospheric Physics Chinese Academy of ScienceBeijing 100029China

Atmospheric aerosols have effects on atmospheric radiation assessments,global climate change,local air quality and *** particular,aerosols are more likely transformed and accumulated in *** this paper,we used the Multi-Axis Differential Optical Absorption Spectroscopy(MAX-DOAS)instrument to study the characteristics of aerosol type and contributions of PM_(2.5) chemical components to aerosol extinction(AE),vertical distribution of aerosols,and *** December 30,2018 to January 27,2019,we conducted MAX-DOAS observations on *** proportion of PM_(2.5) to PM10 was 69.48%-95.39%,indicating that the aerosol particles were mainly fine *** analyzing the ion data and modifying Interagency Monitoring of Protected Visual Environments(IMPROVE)method,we found that nitrate was the largest contributor to AE,accounting for 31.51%,28.98%,and 27.95%of AE on heavily polluted,polluted,and clean days,***4+,OC,and SO42-were also major contributors to *** near-surface aerosol extinction retrieved from MAX-DOAS measurement the PM_(2.5) and PM10 concentrations measured by an Unmanned Aerial Vehicle(UAV)have the same trend in vertical *** increased about 3 times from surface to 500 *** the backward trajectory of the air mass during the haze,we also found that the continuous heavy pollution was mainly caused by transport of polluted air from the northeast,then followed by local industrial emissions and other sources of emissions under continuous and steady weather conditions.

关键词： MAX-DOAS Aerosol optical depth(AOD) Aerosol extinction(AE) Haze PM_(2.5) IMPROVE

Recovery of Li, Ni, Co and Mn from spent lithium-ion batteries assisted by organic acids: Process optimization and leaching mechanism

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International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 518-530页

作者： Liuyi ren bo Liu Shenxu Bao Wei Ding Yimin Zhang Xiaochuan Hou Chao Lin bo Chen School of Resources and Environmental Engineering Wuhan University of TechnologyWuhan 430070China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Wuhan University of Science and TechnologyWuhan 430081China Zhejiang New Era Zhongneng Recycling Technology Co. LtdShaoxing 312000China Shenzhen Water Planning&Design Institute Co. LtdShenzhen 518000China

The proper recycling of spent lithium-ion batteries(LIBs)can promote the recovery and utilization of valuable resources,while also negative environmental effects resulting from the presence of toxic and hazardous *** this study,a new environmentally friendly hydro-metallurgical process was proposed for leaching lithium(Li),nickel(Ni),cobalt(Co),and manganese(Mn)from spent LIBs using sulfuric acid with citric acid as a *** effects of the concentration of sulfuric acid,the leaching temperature,the leaching time,the solid-liquid ratio,and the reducing agent dosage on the leaching behavior of the above elements were *** parameters were optimized using response surface methodology(RSM)to maximize the recovery of metals from spent *** maxim-um recovery efficiencies of Li,Ni,Co,and Mn can reach 99.08%,98.76%,98.33%,and 97.63%.under the optimized conditions(the sulfuric acid concentration was 1.16 mol/L,the citric acid dosage was 15wt%,the solid-liquid ratio was 40 g/L,and the temperature was 83℃ for 120 min),*** was found that in the collaborative leaching process of sulfuric acid and citric acid,the citric acid initially provided strong reducing CO_(2)^(-),and the transition metal ions in the high state underwent a reduction reaction to produce transition metal ions in the low ***,citric acid can also act as a proton donor and chelate with lower-priced transition metal ions,thus speeding up the dissolution process.

关键词： spent lithium-ion batteries leaching response surface methodology sulfuric acid citric acid

Modified(1+1)-Dimensional Displacement Shallow Water Wave System

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Chinese Physics Letters 2013年第10期30卷 1-4页

作者： LIU Ping YANG Jian-Jun ren bo College of Electron and Information Engineering University of Electronic Science and Technology of China Zhongshan InstituteZhongshan 528402 Institute of Nonlinear Science Shaoxing UniversityShaoxing 312000

Recently,a(1+1)-dimensional displacement shallow water wave system(1DDSWWS)was constructed by applying variational principle of the analytic mechanics under the Lagrange ***,fluid viscidity is not considered in the 1DDSWWS,which is the same as the famous Korteweg-de Vries(KdV)*** modify the 1DDSWWS and add the term related to fluid viscosity to the model by means of dimension *** the perfect fluids,the coefficient of kinematic viscosity is zero,then the modified 1DDSWWS(M1DDSWWS)will degenerate to *** KdV-Burgers equation and the Abel equation can be derived from the *** calculation on symmetry shows that the system is invariant under the Galilean transformations and the spacetime *** types of exact solutions and some evolution graphs of the M1DDSWWS are proposed.

关键词： equation viscosity system

Promoting effect of ethanol on dewetting transition in the confined region of melittin tetramer

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Nuclear Science and Techniques 2012年第4期23卷 252-256页

作者： ren Xiuping ZHOU bo WANG Chunlei Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China Graduate School of the Chinese Academy of Sciences Beijing 100080 China

To study the influence of ethanol molecules on the melittin tetramer folding,we investigated the dewetting transition of the melittin tetramer immersed in pure water and 8%aqueous ethanol solution(mass fraction) by the molecular dynamics *** found that the marked dewetting transitions occurred inside a nanoscale channel of the melittin tetramer both in pure water and in aqueous ethanol ***,ethanol molecules promoted this dewetting *** attributed this promoting effect to ethanol molecules which prefer to locate at the liquidvapor interface and decrease the liquid-vapor surface *** results provide insight into the effect of ethanol on the water dewetting phenomena.

关键词：乙醇水溶液四聚体蜂毒肽去湿分子动力学模拟密闭质量分数促进效果

Thermoelectric Properties of Mg_2Si_(1-x)Sn_x Synthesized by Bulk Mechanical Alloying

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Chinese Journal of Aeronautics 2006年第B12期19卷 134-138页

作者： SONG ren-bo LIU Ya-zheng Tatsuhiko AIZAWA School of Material Science and Engineering University of Science and Technology Beijing Beijing 100083 China Jayram Office University of Toronto Shanghai International Building 6F 1-24-12 Shinkawa Chuo-ku Tokyo 104-0033 Japan

Bulk mechanical alloying （BMA） has been successfully applied to solid-state synthesis of p-type and n-type thermoelectric materials Mg2Si1-xSnx （x = 0, 0.2, 0.4, 0.6, 0.8, 1） from element-powders at the room temperature in a relatively short time. The electrical conductivity, the Seebeck coefficient and the thermal conductivity of the Mg2Si1-xSnx are quite sensitive to the x-content. With the x-content rising, the electrical conductivity increases. When x = 0.6, it reaches the lowest and Mg2Si shows an n-type of semi-conducting However, when x = 0.2 and T 〉525 K, the Seebeck coefficient of the samples will change the opposite way. While x≥0.4, the samples present a p-type of semi-conducting. The figure of merit, Z of Mg2Si1-xSnx will be obtained in the range from 300 K to 700 K. When x = 0.6, Z proves to be higher than that of other samples at 300 K≤ T≤650 K.

关键词： solid-state synthesis thermoelectric bulk mechanical alloying Mg2Si1-xSnx

Autophagy in anti-apoptotic effect of augmenter of liver regeneration in HepG2 cells

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World Journal of Gastroenterology 2015年第17期21卷 5250-5258页

作者： hong-bo Shi Hai-Qing Sun hong-Lin Shi Feng ren Yu Chen De-Xi Chen Jin-Li Lou Zhong-Ping Duan Beijing Youan Hospital Capital Medical University Beijing Institute of Hepatology

AIM:To investigate the role of autophagy in the antiapoptotic effect of augmenter of liver regeneration(ALR).METHODS:Autophagy was induced through serum *** ALR-expressing plasmid was transfected into HepG2 cells,and autophagic flux was determined using fluorescence microscopy,electron microscopy,Western blot and quantitative polymerase chain reaction(q PCR) *** ALR-expressing plasmid transfection,an autophagy inhibitor [3-methyladenine(3-MA)] was added to HepG2 cells,and apoptosis was observed using fluorescence microscopy and flow ***:Autophagy was activated in HepG2 cells,peaking at 24 h after serum *** protein light chain three-II levels were higher in HepG2 cells treated with ALR than in control cells,fluorescence microscopy,electron microscopy and q PCR studies showed the similar trend,and p62 levels showed the opposite trend,which indicated that ALR may play an important role in increasing autophagy *** numbers of apoptotic cells were substantially higher in HepG2 cells treated with both ALR and 3-MA than in cells treated with ALR ***,the protective effect of ALR was significantly attenuated or abolished when autophagy was inhibited,indicating that the anti-apoptotic effect of ALR may be related to ***:ALR protects cells from apoptosis partly through increased autophagy in HepG2 cells and may be valuable as a new therapeutic treatment for liver disease.

关键词： Autophagy Augmenter of liver regeneration Apoptosis HepG2 cells

Characteristics of Mechanical Properties and Microstructure for 316L Austenitic Stainless Steel

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Journal of Iron and Steel Research International 2011年第11期18卷 53-59页

作者： SONG ren-bo XIANG Jian-ying HOU Dong-po School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

A comparative study on mechanical properties and microstructure of 316L austenitic stainless steel between solution treated specimen and hot rolled specimen was conducted. After a specimen was subjected to solution treatment at 1 050 ℃ for 6 min, its mechanical properties were determined through tensile and hardness tests. Based on the true stress vs true strain and engineering stress vs engineering strain flow curves, the work hardening rate has been explored. The results show that the solution treated specimen has an excellent combination of strength and elongation, and that this steel is easy to work-hardening during deformation. Optical microscope, scanning electron micro- scope, transmission electron microscope and X-ray diffraction examinations were conducted, these reveal that twins in 316L austenitic stainless steel can be divided into suspended twin and transgranular twin which have different for mation mechanisms in growth, and that the deformation induced martensite nucleated and grown in the shear band intersections can be observed, and that the fracture surfaces are mainly composed of dimples and exhibit a tough fracture character.

关键词： 316L mechanical property twin martensite fracture morphology

Wear behavior of bainite ductile cast iron under impact load

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International Journal of Minerals,Metallurgy and Materials 2014年第9期21卷 871-877页

作者： Ting Sun ren-bo Song Fu-qiang Yang Chun-jing Wu School of Materials Science and Engineering University of Science and Technology Beijing

The dry impact wear behavior of bainite ductile cast iron was evaluated under three different impact loads for 30000 cycles. The strain-hardening effects beneath the contact surfaces were analyzed according to the surfaces＇ micro-hardness profiles. Scanning electron microscopy （SEM） and X-ray diffraction （XRD） were used to observe the wom surfaces. The results indicated that the material with the highest hardness was the one continuously cooled at 20℃, which exhibited the lowest wear rate under each set of test conditions. The hardness of the worn surface and the thickness of the hardened layer increased with the increases in impact load and in the number of test cycles. The better wear performance of the sample cooled at 20℃ is attributed to its finer microstructure and superior mechanical properties. All the samples underwent the transformation induced plasticity （TRIP） phenomenon after impact wear, as revealed by the fact that small amounts of retained austenite were detected by XRD.

关键词： cast iron continuous cooling wear behavior impact loads martensitic transformations

Emission characteristics of carbon dioxide in the semiarid Stipa grandis steppe in Inner Mongolia, China

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Journal of Environmental Sciences 2006年第3期18卷 488-494页

作者： LIU Xing-ren QI Yu-chun LIU Ji-yuan Manfred Domroes LIU Li-xin GENG Yuan-bo YANG Xiao-hong LI Ming-feng Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Department of Geography Mainz University 55099 Mainz Germany Graduate School of the Chinese Academy of Sciences Beijing 100039 China

Using the static opaque chamber method, the soil respiration rates （SR） were measured through the continuous experiments in situ in semiarid Stipa grandis steppe in Xilin River Basin of Inner Mongolia, China from June 2001 to June 2003, in parallel, the difference between the SR and the ecosystem respiration rates （TER） were compared. The results indicated that the seasonal variations of the SR and TER were obvious with higher emissions in growing season and a relatively low efflux level in non-growing season, furthermore, the negative effluxes were found in the observation site in winter; the annual CO2 efflux of total ecosystem ranged from 160.5 gC/（m^2·a） to 162.8 gC/（m^2·a） and that of soil ranged from 118.7 gC/（m^2·a） to 152.3 gC/（m^2·a）. The annual SR accounted for about 74.0% to 93.5% of the annual TER, but the results of Analysis of Variance （ANOVA） indicated that the difference between the annual average TER and SR did not reach the significance level of 0.05. The TER was under similar environmental controls as SR, in growing seasons of drought years, the variations of soil moisture at 0-10 cm and 10-20 cm depth could account for 79,1% 95.6% of the changes of the SR and TER, but in non-growing season, more than 75% of the variations of the SR and TER could be explained by the changes of the ground temperature of soil surface layers.

关键词： Inner Mongolia semiarid grassland Stipa grandis steppe CO2 fluxes environmental factors