检索结果-南通市图书馆

particulate matter emission by an isolated rotating wheel

Building Simulation 2021年第4期14卷 1163-1173页

作者： Jinwei Song Hua Qian Dongliang Zhao Weixue Jiang Xiaohong Zheng School of Energy and Environment Southeast UniversityNanjingChina Engineering Research Center of Building Equipment Energyand EnvironmentMinistry of EducationBeijingChina College of Electrical Energy and Power EngineeringYangzhou UniversityYangzhouChina Jiangsu Provincial Key Laboratory of Solar Energy Science and Technology School of Energy and EnvironmentSoutheast UniversityNanjing210096China

particulate matter emission from rotating wheels, which imparts a force to the contact surface and causes strong air currents, is one of the important pollutant sources on the road. This study investigates the particulate matter emission by measuring mass and size distributions of particulate matter near an isolated rotating wheel in a deliberately designed setup. Five rotating speeds from 0.7 m/s to 1.5 m/s are conducted to test its impact on the emission of particulate matter. Mass of particulate matter is measured at twenty-six sampling points around the rotating wheel under different experimental conditions. Experimental results show that the farther away from the wheel, the less of particulate matters deposited on the sampling points in general. Moreover, the emission factor increases from 0.12 g/vkt to 0.24 g/vkt when the rotating speed of the wheel increases from 0.7 m/s to 1.5 m/s. The number and proportion of PM2.5 and PM10 on different sampling points are also measured. The results show that the position of the highest number of PM2.5 and PM10 tends to move to a further and higher sampling point with the increasing of the speed. Moreover, the number proportions of PM2.5 and PM10 on the sampling points range from 19% to 97% and 61% to 100% at different speeds, respectively. This study is believed to be helpful to estimate particulate matter emission and make effective control strategies on targeted pollution.

关键词： particulate matter emission rotating wheel speed

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

particulate matter geochemistry of a highly industrialized region in the Caribbean:Basis for future toxicological studies

引用

Geoscience Frontiers 2022年第1期13卷 376-387页

作者： Luis F.O.Silva Ismael L.Schneider Paulo Artaxo Yuleisy Núñez-Blanco Diana Pinto Érico M.M.Flores Leandro Gómez-Plata Omar Ramírez Guilherme L.Dotto Department of Civil and Environmental Universidad de la CostaCUCCalle 58#55–66BarranquillaAtlánticoColombia Department of Applied Physics Institute of PhysicsUniversity of São PauloBrazil Department of Chemistry Universidade Federal de Santa MariaRSBrazil Universidad Militar Nueva Granada(UMNG) Faculty of EngineeringEnvironmental EngineeringKm 2 Cajicá-ZipaquiráColombia Chemical Engineering Department Federal University of Santa Maria-UFSM1000Roraima Avenue97105-900 Santa MariaRSBrazil

Air pollution has become an important issue,especially in Caribbean urban areas,and,particulate matter(PM)emitted by different natural and anthropogenic sources causes environmental and health *** this work,we studied the concentrations of PM_(10) and PM_(2.5) sources in an industrial and port urban area in the Caribbean region of *** samples were collected within 48-h periods between April and October 2018 by using a Partisol 2000 i-D *** geochemical characterization was performed by X-ray fluorescence(XRF)***,ionic species and black carbon(BC)were quantified by ion chromatography and reflectance spectroscopy,*** the Positive Matrix Factorization(PMF)receptor model,the contributions of PM sources were *** average concentration of PM_(10) was 46.6±16.2μg/m^(3),with high concentrations of Cl and *** PM_(2.5),the average concentration was 12.0±3.2μg/m^(3),and the most abundant components were BC,S,and *** receptor model identified five sources for PM_(10) and PM_(2.5).For both fractions,the contributions of marine sea spray,re-suspended soil,and vehicular traffic were *** addition,PM_(2.5) included two mixed sources were found to be fuel oil combustion with fertilizer industry emissions,and secondary aerosol sources with building construction ***,PM_(10) was found to also include building construction emissions with re-suspended soil,and metallurgical industry *** obtained geochemical atmospheric results are important for the implementation of strategies for the continuous improvement of the air quality of the Caribbean region.

关键词： Urban air pollution particulate matter Geochemical composition Aerosol source apportionment Receptor models PMF

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Palm oil biodiesel:An assessment of PAH emissions,oxidative potential and ecotoxicity of particulate matter

引用

Journal of Environmental Sciences 2021年第3期33卷 326-338页

作者： Silvana Arias Francisco Molina John R.Agudelo Grupo de Investigación en Gestión y Modelación Ambiental-GAIA Escuela AmbientalFacultad de IngenieríaUniversidad de Antioquia UdeACalle 70 No.52-21MedellínColombia Departamento de Ingeniería Mecánica Universidad de Antioquia UdeA

This work assessed the impact of fuelling an automotive engine with palm biodiesel(pure,and two blends of 10%and 20%with diesel,B100,B10 and B20,respectively)operating under representative urban driving conditions on 17 priority polycyclic aromatic hydrocarbon(PAH)compounds,oxidative potential of ascorbic acid(OP^(AA)),and ecotoxicity through D aphnia pulex mortality *** diluted with filtered fresh air(WD)gathered in a minitunel,and particulate matter(PM)collected directly from the exhaust gas stream(W/oD)were used for *** showed that PM collecting method significantly impact PAH *** all PAH appeared in both,WD and W/oD,higher concentrations were obtained in the last *** biodiesel concentration in the fuel blend decreased all PAH compounds,and those with 3 and 5 aromatic rings were the most *** biodiesel affected both OP^(AA)and *** B10 and B20 exhibited the same rate of ascorbic acid(AA)depletion,B100 showed significant faster oxidation rate during the first four minutes and oxidized 10%more AA at the end of the test.B100 and B20 were significantly more ecotoxic than *** lethal concentration LC50 for B10 was 6.13 mg/*** was concluded that palm biodiesel decreased PAH compounds,but increased the oxidative potential and ecotoxicity.

关键词： Biodiesel particulate matter P emissions Oxidative stress Ecotoxicity Daphnia pulex

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Suspended particulate matter promotes epithelial-to-mesenchymal transition in alveolar epithelial cells via TGF-β1-mediated ROS/IL-8/SMAD3 axis

引用

Journal of Environmental Sciences 2024年第7期141卷 139-150页

作者： Shahrzad Molavinia Dian Dayer Mohammad Javad Khodayar Gholamreza Goudarzi Maryam Salehcheh Cellular and Molecular Research Center Medical Basic Sciences Research InstituteAhvaz Jundishapur University of Medical SciencesAhvazIran Department of Toxicology School of PharmacyAhvaz Jundishapur University of Medical SciencesAhvazIran Student Research Committee Ahvaz Jundishapur University of Medical SciencesAhvazIran Toxicology Research Center Medical Basic Sciences Research InstituteAhvaz Jundishapur University of Medical SciencesAhvazIran Air Pollution and Respiratory Diseases Research Center Ahvaz Jundishapur University of Medical SciencesAhvazIran Iranian Scientific Association of Clean Air TehranIran

Epidemiological evidence presents that dust storms are related to respiratory diseases,such as pulmonary fibrosis(PF).However,the precise underlying mechanisms of SPM-elicited adverse effects still need to be ***-mesenchymal transition(EMT)process is a characteristic of *** discussed whether suspended particulate matter(SPM)is involved in EMT induction via transforming growth factor-β1(TGF-β1).In this study,a detailed elemental analysis(55 elements),particle size,and morphology were *** investigate the toxicity of SPM,an MTT test was performed to detect cell ***,A549cells were exposed to selected concentrations of SPM(20 and 40μg/mL)for single and repeated *** DCFH-DA assay showed that exposure to SPM could produce reactive oxygen species(ROS).The ELISA assay demonstrated increased levels of interleukin-8(IL-8)and TGF-β1 in the *** blot was used to detect the expression of proteins associated with EMT and the SMAD3-dependent *** of western blot demonstrated that E-cadherin was reduced,whereas p-SMAD3,vimentin,andα-smooth muscle actin were *** findings indicated that SPM triggered EMT by induction of oxidative stress,inflammation,and the TGF-β1/SMAD3 pathway activation.

关键词： particulate matter TGF-β1 Oxidative stress Epithelial-mesenchymal transition Pulmonary fibrosis Cells

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A method for quantifying bias in modeled concentrations and source impacts for secondary particulate matter

引用

Frontiers of Environmental Science & Engineering 2016年第5期10卷 153-164页

作者： Cesunica E. lvey Heather A. Holmes Yongtao Hu James A. Muiholland Armistead G. Russell School of Civil and Environmental Engineering Georgia Institute of Technology 311 Ferst Drive Atlanta GA 30332 USA Department of Physics University of Nevada Reno 1664 N Virginia St Reno NV 89557 USA

Community Multi-Scale Air Quality （CMAQ） estimates of sulfates, nitrates, ammonium, and organic carbon are highly influenced by uncertainties in modeled secondary formation processes, such as chemical mechanisms, volatilization, and condensation rates. These compounds constitute the majority ofPM2.5 mass, and reducing bias in estimated concentrations has benefits for policy measures and epidemiological studies. In this work, a method for adjusting source impacts on secondary species is developed that provides estimates of source contributions and reduces bias in modeled concentrations compared to observations. The bias correction adjusts concentrations and source impacts based on the difference between modeled concentrations and observations while taking into account uncertainties at the location of interest; and it is applied both spatially and temporally. We apply the method over the US for 2006. The mean bias for initial CMAQ concentrations compared to observations is -0.28 （OC）, 0.11 （NO3）, 0.05 （NH4）, and -0.08 （SO4）. The normalized mean bias in modeled concentrations compared to observations was effectively zero for OC, NO3, NH4, and SO4 after applying the secondary bias correction. Ten-fold cross-validation was conducted to determine the performance of the spatial application of the bias correction. Cross-validation performance was favorable; correlation coefficients were greater than 0.69 for all species when comparing observations and concentrations based on kriged correction factors. The methods presented here address model uncertainties by improving simulated concentrations and source impacts of secondary particulate matter through data assimilation. Secondary-adjusted concentrations and source impacts from 20 emissions sources are generated for 2006 over continental US.

关键词： particulate matter Source apportionment Secondary particulate matter Chemical transport modeling Receptor modeling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Emissions of particulate matter and associated polycyclic aromatic hydrocarbons from agricultural diesel engine fueled with degummed,deacidified mixed crude palm oil blends

引用

Journal of Environmental Sciences 2013年第4期25卷 751-757页

作者： Khamphe Phoungthong Surajit Tekasakul Perapong Tekasakul Gumpon Prateepchaikul Naret Jindapetch Masami Furuuchi Mitsuhiko Hata Department of Chemistry and Center of Excellence for Innovation in Chemistry(PERCH-CIC) Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90112Thailand Energy Technology Research Center and Department of Mechanical Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90112Thailand National Center of Excellence for Environmental and Hazardous Waste Management(EHWM) Southern Consortium Universities at Prince of Songkla University Hat YaiSongkhla 90112Thailand Graduate School of Natural Science and Technology Kanazawa UniversityKakuma-machiKanazawa 920-1162Japan

Mixed crude palm oil （MCPO）, the mixture of palm fiber oil and palm kernel oil, has become of great interest as a renewable energy source. It can be easily extracted from whole dried palm fruits. In the present work, the degummed, deacidified MCPO was blended in petroleum diesel at portions of 30% and 40% by volume and then tested in agricultural diesel engines for long term usage. The particulates from the exhaust of the engines were collected every 500 hr using a four-stage cascade air sampler. The 50% cut-off aerodynamic diameters for the first three stages were 10, 2.5 and 1μm, while the last stage collected all particles smaller than 1 μm. Sixteen particle bounded polycyclic aromatic hydrocarbons （PAHs） were analyzed using a high performance liquid chromatography. The results indicated that the size distribution of particulate matter was in the accmnulation mode and the pattern of total PAHs associated with fine-particles （〈 1 μm） showed a dominance of larger molecular weight PAHs （4--6 aromatic rings）, especially pyrene. The mass median diameter, PM and total PAH concentrations decreased when increasing the palm oil content, but increased when the running hours of the engine were increased. In addition, Commercial petroleum diesel （PB0） gave the highest value of carcinogenic potency equivalent （BaPeq） for all particle size ranges. As the palm oil was increased, the; BaPeq decreased gradually. Therefore the degununed-deacidified MCPO blends are recommended for diesel substitute.

关键词： mixed crude palm oil palm oil blend agricultural diesel engine potycyclic aromatic hydrocarbon particulate matter

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Are current Chinese national ambient air quality standards on 24-hour averages for particulate matter sufficient to protect public health？

引用

Journal of Environmental Sciences 2018年第9期30卷 67-75页

作者： Rongshan Wu Xiaoming Song Yingchen Bai Jie Chen Qian Zhao Shuo Liu Hongbing Xu Baihuan Feng Yi Zhang Liuju Zhong Xuemei Wang Pengchang Wu Wei Huang Department of Occupational and Environmental Health Peking University School of Public Health Beijing 100191 China Key Laboratory of Molecular Cardiovascular Sciences of Ministry of Education Pekin9 University Beijin9 100191 China State Key Laboratory of Environmental Criteria and Ris}e Assessment Chinese Research Academy of Environmental SciencesBeijing 100012 China Guangdong Polytechnic of Environmental Protection Engineering Foshan 528216 China Institute for Environmental and Climate Research Jinan University Guangzhou 510632 China

With rapid economic development and urbanization in recent decades, China has experienced the worsening of ambient air quality. For better air quality management to protect human health, Chinese government revised national ambient air quality standards （NAAQS） for particulate matter （PM） in 2012 （GB3095-2012）. To assess the effectiveness of current NAAQS for PM on public health in Chinese population, we conducted a meta- analysis on published studies examining the mortality risk of short-term exposure to PM with aerodynamic diameters less than 10 and 2.5μm （PM10 and PM2.5） in China. The reported 24-hour concentrations of PM10 and PM2.5 in studies ranged from 43.5 to 150.1 μg/m^3 and 37.5 to 176.7 μg/m^3. In the pooled excess, mortality risk estimates of short-term exposure to PM. In specific, per 10 μg/m^3 increase in PM10, we observed increases of 0.40% （95%CI： 0.33%, 0.47%）, 0.57% （95%CI： 0.44%, 0.70%） and 0.49% （95%CI： 0.40%, 0.58%） in total, respiratory and cardiovascular mortality, per 10/μg/m^3 increase in PM2.5, we observed increases of 0.51% （95% CI： 0.38%, 0.63%）, 0.62% （95%CI： 0.52%, 0.73%） and 0.75% （95%CI： 0.54%, 0.95%） in total, respiratory and cardiovascular mortality. Finally, we derived 125 μg/m^3 for PM10 and 62.5 μg/ m^3 for PM2.5 as 24-hour recommendation values based on the pooled estimates. Our results indicated that current Chinese NAAQS for PM could be sufficient in mitigating the excess mortality risk from short-term exposure to ambient PM. However, future research on long-term exposure cohort studies in Chinese population is also essential in revising annual averages for PM in Chinese NAAQS.

关键词： particulate matter Mortality Meta-analysis Air quality standard China

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of low-cost particulate matter sensors for air quality monitoring and exposure assessment in underground mines:A review

引用

International Journal of Minerals,Metallurgy and Materials 2022年第8期29卷 1475-1490页

作者： Nana A.Amoah Guang Xu Yang Wang Jiayu Li Yongming Zou Baisheng Nie Department of Mining Engineering Missouri University of Science and TechnologyRollaMissouri 65401USA Department of Civil Architectural and Environmental EngineeringMissouri University of Science and TechnologyRollaMissouri 65401USA Department of Bioproducts and Biosystems Engineering University of MinnesotaSt.PaulMN 55455USA China Coal Technology and Engineering Group Shenyang Research Institute Fushun 113122China State Key Laboratory of Coal Mine Safety Technology Fushun 113122China School of Resources and Safety Engineering Chongqing UniversityChongqing 400044China

Exposure to mining-induced particulate matter(PM)including coal dust and diesel particulate matter(DPM)causes severe respirat-ory diseases such as coal workers’pneumoconiosis(CWP)and lung *** spatiotemporal resolution of current PM monitors causes miners to be exposed to unknown PM concentrations,with increased overexposure ***-cost PM sensors offer a potential solution to this challenge with their capability in characterizing PM concentrations with high spatiotemporal ***,their application in underground mines has not been *** the aim of examining the potential application of low-cost sensors in underground mines,a critical review of the present status of PM sensor research is *** working principles of present PM monitors and low-cost sensors are *** error sources are identified,and comprehensive calibration processes are presented to correct *** protocols are pro-posed to evaluate sensor performance prior to deployment,and the potential application of low-cost sensors is discussed.

关键词： particulate matter low-cost sensors air quality underground mine sensor calibration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Adhesive surface-enhanced Raman scattering Cu-Au nanoassembly for the sensitive analysis of particulate matter

引用

Journal of Environmental Sciences 2023年第6期128卷 35-44页

作者： Ning Wang Zhiqiang Gan Fengkui Duan Hui Chen Chensheng Ma Jie Ji Zhenli Sun MOE Key Laboratory of Resources and Environmental System Optimization College of Environmental Science and EngineeringNorth China Electric Power UniversityBeijing 102206China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Surface-enhanced Raman scattering(SERS)has been used in atmospheric aerosol detection as it enables the high-resolution analysis of particulate ***,its use in the detection of historical samples without damaging the sampling membrane while achieving effective transfer and the high-sensitivity analysis of particulate matter from sample films remains *** this study,a new type of SERS tape was developed,consisting of Au nanoparticles(NPs)on an adhesive double-sided Cu film(DCu).The enhanced electromagnetic field generated by the coupled resonance of the local surface plasmon resonances of AuNPs and DCu led to an enhanced SERS signal with an experimental enhancement factor of 10^(7).The AuNPs were semi-embedded and distributed on the substrate,and the viscous DCu layer was exposed,enabling particle *** substrates exhibited good uniformity and favorable reproducibility with relative standard deviations of 13.53%and 9.74%respectively,and the substrates could be stored for 180 days with no signs of signal *** application of the substrates was demonstrated by the extraction and detection of malachite green and ammonium salt particulate *** results demonstrated that SERS substrates based on AuNPs and DCu are highly promising in real–world environmental particle monitoring and detection.

关键词： Surfaced-enhanced Raman scattering particulate matter Adhesive plasmonic coupling Electromagnetic enhancement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of the amount of trapped particulate matter on diesel particulate filter regeneration performance using nonthermal plasma assisted by exhaust waste heat

引用

Plasma Science and Technology 2020年第1期22卷 87-95页

作者： Yunxi SHI Yixi CAI Xiaohua LI Xiaoyu PU Nan ZHAO Weikai WANG School of Automotive and Traffic Engineering Jiangsu UniversityZhenjiang 212013People's Republic of China

An experimental system of diesel particulate filter(DPF)regeneration using non-thermal plasma(NTP)technology assisted by exhaust waste heat was conducted and regeneration experiments of DPFs with different amounts of trapped particulate matter(PM)were *** concentrations of the PM decomposition products(CO,)and the internal temperature of the DPF were monitored to determine the performance of DPF regeneration and thermal safety of the NTP *** results showed that the concentrations of CO and CO2and the mass of P.V1 decomposition increased with the increase in the amount of captured PM,whereas the concentration of the NTP active substance(O,)escaping from the DPF decreased under the same working conditions of the NTP injection system.A higher amount of captured PM promoted the oxidative decomposition reaction between NTP and PM and improved the utilization rate of the NTP active *** peak temperature at the same measuring point inside the DPF generally increased and the phases of the peak temperature were delayed as the amount of captured PM *** temperature peaks and temperature gradients during the DPF regeneration process were far lower than llie failure limit value,which indicates that NTP regeneration technology has good thermal durability and increases the service life of the DPF.

关键词： diesel diesel particulate filter regeneration particulate matter non-thermal plasma

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：