检索结果-内蒙古大学图书馆

Influence of fuel quality on vehicular NOx emissions

Journal of environmental Sciences 2001年第3期13卷 265-271页

作者： WANG Shao xia, SHAO Min, ZHANG Yuan hang (state Joint key laboratory of environmental simulation and pollution control, Center for environmental Sciences, Peking University, Beijing 100871, China. State Joint Key Laboratory of Environmental Simulation and Pollution Control Center for Environmental Sciences Peking University Beijing 100871 China.

The quality of gasoline and diesel fuel affects pollutant emissions from vehicles. By applying the COMPLEX model, developed by the US EPA and industry to relate fuel composition to vehicle emissions, this paper estimates the influence of improvements in gasoline quality to lower vehicular NOx emissions. A case study is performed for Guangzhou City that has NOx concentrations significantly above the national ambient air quality standards (NAAQS). The paper discusses the potential for reducing NOx in Guangzhou by improving the quality of gasoline.

关键词： Air quality Automotive fuels Gasoline

来源：评论

学校读者我要写书评

暂无评论

Screening the emission sources of volatile organic compounds （VOCs） in China by multi-effects evaluation

引用

Frontiers of environmental Science & Engineering 2016年第5期10卷 25-35页

作者： He NIU Ziwei MO Min SHAO Sihua LU ShaodongXIE State Joint Key Laboratory of Environmental Simulation and Pollution Control College of Environmental Science and Engineering Peking University Beijing 100871 China

Volatile organic compounds （VOCs） play important roles in the atmosphere via three main pathways： photochemical ozone formation, secondary organic aerosol production, and direct toxicity to humans. Fewstudies have integrated these effect, s to prioritize control measures for VOC.s sources. In this study,we developed a multi-effects evaluation methodology based on updated emission inventories and source profiles, by combining the ozone formation potential （OFP）, secondary organic aerosol potential （SOAP）, and VOC toxicity data. We derived species-specific emission inventories for 152 sources. The OFPs, SOAPs, and toxicity of each source were estimated, the contribution and sharing of source to each of these adverse effects were calculated. Weightings were given to the three adverse effects by expert scoring, and then the integrated effect was determined. Taking 2012 as the base year,solvent use and industrial process were found to be the most important anthropogenic sources, accounting for 24.2% and 23.1% of the integrated effect, respectively, followed by biomass burning, transportation, and fossil fuel combustion, each had a similar contribution ranging from 16.7% to 18.6%. The top five industrial sources, including plastic products, rubber products, chemical fiberproducts, the chemical industry, and oil refining, accounted for nearly 70.0% of industrial emissions. Beijing, Chongqing, Shanghai, Jiangsu, and Guangdong were the five provinces contributing the largest integrated effects. For the VOC species from emissions showed the largest contributions were styrene, toluene, ethylene, benzene, and m/p-xylene.

关键词： Ozone formation Secondary organic aerosol Multi-effects evaluation VOC abatement strategy

来源：评论

学校读者我要写书评

暂无评论

Enhancement on the ammonia oxidation capacity of ammonia-oxidizing archaeon originated from wastewater:Utilizing low-density static magnetic field

引用

Frontiers of environmental Science & Engineering 2021年第5期15卷 67-74页

作者： Zeshen Tian Bo Wang Yuyang Li Bo Shen Fengjuan Li Xianghua Wen State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China

Ammonia-oxidizing archaeon(AOA)could play important roles for nitrogen removal in the bioreactors under conditions such as low pH and low dissolved ***,enhancing ammonia oxidation capability of AOA has great significance for water and wastewater treatment,especially under conditions like low dissolved oxygen *** a novel AOA strain SAT1,which was enriched from a wastewater treatment plant by our group,the effect of magnetic field on AOA’s ammonia oxidation capability,its magnetotaxis and heredity were investigated in this *** with control experiment,AOA’s maximum nitrite-N formation rate during the cultivation increased by 56.8%(0.65 mgN/(L·d))with 20 mT magnetic ***,it was testified that AOA possessed a certain ***,results manifested that the enhancement of AOA’s ammonia oxidation capability was not heritable,that is,lost once the magnetic field was ***,the possible mechanism of improving AOA’s ammonia oxidation capability by magnetic field was owing to the promotion of AOA single cells’growth and fission,rather than the enhancement of their ammonia oxidation *** results shed light on the application of AOA and methods to enhance AOA’s ammonia oxidation capability,especially in wastewater treatment processes under certain conditions.

关键词： Ammonia-oxidizing archaeon Ammonia oxidation Magnetic field Magnetotaxis Heredity

来源：评论

学校读者我要写书评

暂无评论

Efficient photoelectrochemical oxidation of rhodamine B on metal electrodes without photocatalyst or supporting electrolyte

引用

Frontiers of environmental Science & Engineering 2018年第6期12卷 113-118页

作者： Xuejiao Wang Xiang Feng Jing Shang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China

We designed photoelectrochemical cells to achieve efficient oxidation of rhodamine B (RhB) without the need for photocatalyst or supporting electrolyte. RhB, the metal anode/cathode, and O2 formed an energy-relay structure, enabling the efficient formation of O2– species under ultraviolet illumination. In a single-compartment cell (S cell) containing a titanium (Ti) anode, Ti cathode, and 10 mg·mL–1 RhB in water, the zero-order rate constant of the photoelectrochemical oxidation (kPEC) of RhB was 0.049 mg·L–1·min–1, while those of the photochemical and electrochemical oxidations of RhB were nearly zero. kPEC remained almost the same when 0.5 mol·L–1 Na2SO4 was included in the reactive solution, regardless of the increase in the photocurrent of the S cell. The kPEC of the illuminated anode compartment in the two-compartment cell, including a Ti anode, Ti cathode, and 10 mg·mL–1 RhB in water, was higher than that of the S cell. These results support a simple, eco-friendly, and energysaving method to realize the efficient degradation of RhB.

关键词： Energy relay structure Energy saving Photocatalyst-free and low-salinity degradation Photoelectrochemical cell

来源：评论

学校读者我要写书评

暂无评论

Plant flowers transmit various bio-agents through air

引用

Science China Earth Sciences 2020年第10期63卷 1613-1621页

作者： Siyu XU Maosheng YAO State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China

Growing air pollution,known as"April snow",by fluffy catkins from plant flowering was frequently observed during the Spring time in *** efforts mainly focus on controlling catkin release,while their public health and environmental impacts are ***,using culturing,microscopic and sequence methods we found that the flying catkins carry a significant amount of bio-agents(bacteria,fungal,viruses,and pollens),e.g.,up to 6.33×10^4 bacterial and 7.46×10^5 fungal cells per *** pollens from plants were also found riding on the flying *** collected fluffy catkins,bacterial Paracoccus,Massilia,fungal Ophiocordyceps,Arthrocladiella,pollen Robina,Pickeringia,Pinus,and viral family Genomoviridae,to name a few,were found to be *** infection and allergic potentials,the detected microbial structures on the fluffy catkins were different from those of local air,varying from one location to *** not just white pollution,flying plant fluffy catkins were discovered here also acting as a cloud of biological agents,and further actions need to be taken urgently to understand and limit their environmental and ecological consequences.

关键词： Plant flowering Flying fluffy catkins Bio-agents Transmission Air pollution

来源：评论

学校读者我要写书评

暂无评论

Distributions of dimethylsulfide in the Bohai Sea and Yellow Sea of China

引用

Journal of environmental Sciences 2003年第6期15卷 762-767页

作者： HU Min TANG Xiao-yan LI Jin-long MA Qi-ju State Joint Key Laboratory of Environmental Simulation and Pollution Control Center for Environmental Sciences Peking UniversityBeijing 100871China.

Dimethylsulfide(DMS) measurements in the surface seawater of China eastern coastline were conducted during March 9—10, 1993 in Bohai Sea along the cruise from Dalian to Tianjin and during September 24—25, 1994 in Yellow Sea along the cruise from Shanghai to Qingdao. On the cruise in Bohai Sea DMS concentrations varied from 0.11 to 2.63 nmol/L with an average of 1.31 nmol/L, while DMS flux was estimated to be 0.85 μmol/(m 2·d) with the range of 0.04—3.12 μmol/(m 2·d). On the cruise in Yellow Sea DMS concentrations varied from 0.95 to 7.48 nmol/L with an average of 2.89 nmol/L, and DMS flux was estimated to be 7.94 μmol/(m 2·d) with the range of 0.11—18.88 μmol/(m 2·d). Variations in DMS concentrations along the latitude in Yellow Sea were observed larger than those along the longitude in Bohai Sea. DMS concentrations and fluxes had a similar spatial trend both in Bohai Sea and Yellow Sea with the correlation coefficients of 0.75 and 0.64, respectively.

关键词： dimethylsulfide sea-to-air flux China Bohai Sea China Yellow Sea

来源：评论

学校读者我要写书评

暂无评论

Analysis of China’s PM_(2.5)and ozone coordinated control strategy based on the observation data from 2015 to 2020

引用

Journal of environmental Sciences 2024年第4期138卷 385-394页

作者： Liuwei Kong Mengdi Song Xin Li Ying Liu Sihua Lu Limin Zeng Yuanhang Zhang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China

The coordinated control of PM_(2.5)and ozone has become the strategic goal of national air pollution *** the gradual decline in PM_(2.5)concentration and the aggravation of ozone pollution,a better understanding of the coordinated control of PM_(2.5)and ozone is urgently ***,we collected and sorted air pollutant data for 337 cities from 2015 to 2020 to explore the characteristics of PM_(2.5)and ozone pollution based on China’s five major air pollution *** results show that it is necessary to continue to strengthen the emission reduction in PM_(2.5)and ozone precursors,and control NO_(x) and VOCs while promoting a dramatic emission reduction in PM_(2.5).The primary method of curbing ozone pollution is to strengthen the emission control of VOCs,with a long-term strategy of achieving substantial emission reductions in NO_(x),because VOCs and NO_(x) are also precursors to PM_(2.5);hence,their reductions also contribute to the reduction in PM_(2.5).Therefore,the implementation of a multipollutant emission reduction control strategy aimed at the prevention and control of PM_(2.5)and ozone pollution is the only means to realize the coordinated control of PM_(2.5)and ozone.

关键词： PM_(2.5) Ozone Coordinated control Multipollutant reduction

来源：评论

学校读者我要写书评

暂无评论

Spatial Distribution and environmental Determinants of Denitrification Enzyme Activity in Reed-Dominated Raised Fields

引用

Chinese Geographical Science 2015年第4期25卷 438-450页

作者： LAN Yan CUI Baoshan HAN Zhen LI Xia LI Fengju ZHANG Yongtao School of Environment State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing Normal University

Denitrification is an important process of nitrogen removal in lake ***,the importance of denitrification across the entire soil-depth gradients including subsurface layers remains poorly *** study aims to determine the spatial pattern of soil denitrification enzyme activity(DEA) and its environmental determinants across the entire soil depth gradients in the raised fields in Baiyang Lake,North *** two different zones of the raised fields(i.e.,water boundary *** body of the raised fields),the soil samples from 1.0 m to 1.1 m depth were collected,and the DEA and following environmental determinants were quantified:soil moisture,p H,total nitrogen(TN),ammonia nitrogen(NH4+-N),nitrate nitrogen(NO3–-N),total organic carbon(TOC),and rhizome biomass of Phragmites *** results showed that the soil DEA and environmental factors had a striking zonal distribution across the entire soil depth *** soil DEA reached two peak values in the upper and middle soil layers,indicating that denitrification are important in both topsoil and subsurface of the raised *** correlation analysis showed that the DEA is negatively correlated with the soil depth(p < 0.05).However,this phenomenon did not occur in the distance to the water edge,except in the upper layers(from 0.2 m to 0.7 m) of the boundary zone of the raised *** the main body of the raised fields,the DEA level remained high;however,it showed no significant relationship with the distance to the water *** linear regression analysis showed significant positive correlation of the DEA with the soil TN,NO3–-N,NH4+-N,and TOC;whereas it showed negative correlation with soil p *** significant correlations with soil moisture and temperature were observed.A positive correlation was also found between the DEA and rhizome biomass of ***.

关键词： denitrification enzyme activity（DEA） nitrate removal raised fields Baiyang Lake rhizomes

来源：评论

学校读者我要写书评

暂无评论

Ambient photolysis frequency of NO2 determined using chemical actinometer and spectroradiometer at an urban site in Beijing

引用

Frontiers of environmental Science & Engineering 2016年第6期10卷 73-81页

作者： Qi Zou Keding Lu Yusheng Wu Yudong Yang Zhuofei Du Min Hu State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing 100871 China

The photolysis frequency of NO2, j（NO2）, is an important analytical parameter in the study of tropospheric chemistry. A chemical actinometer （CA） was built to measure the ambient j（NQ） based on a high precision NOx instrument with 1 min time resolution. Parallel measurements of the ambient j（NO2） by using the CA and a commercial spectroradiometer （SR） were conducted at a typical urban site （Peking University Urban environmental Monitoring Station） in Beijing. In general, good agreement was achieved between the CA and SR data with a high linear correlation coefficient （R2 = 0.977） and a regression slope of 1.12. The regression offset was negligible compared to the measured signal level. Thej（NO2） data were calculated using the tropospheric ultraviolet visible radiation （TUV） model, which was constrained to observe aerosol optical properties. The calculated j（NO2） was intermediate between the results obtained with CA and SR, demonstrating the consistency of all the parameters observed at this site. The good agreement between the CA and SR data, and the consistency with the TUV model results, demonstrate the good performance of the installed SR instrument. Since a drift of the SR sensitivity is expected by the manufacturer, we propose a regular check of the data acquired via SR against those obtained by CA for long-term delivery of a high quality series ofj（NO2） data. Establishing such a time series will be invaluable for analyzing the long-term atmospheric oxidation capacity trends as well as O3 pollution for urban Beijing.

关键词： Photolysis frequency of nitrogen dioxide Chemical actinometer Spectroradiometer Tropospheric ultraviolet visible radiationmodel

来源：评论

学校读者我要写书评

暂无评论

Reinvestigation of the Henry's law constant for hydrogen peroxide with temperature and acidity variation

引用

Journal of environmental Sciences 2010年第4期22卷 570-574页

作者： Daoming Huang,Zhongming Chen The state key laboratory of environmental simulation and pollution control,College of environmental Sciences and Engineering,Peking University,Beijing 100871,China. [a] The State Key Laboratory of Environmental Simulation Pollution Control College of Environmental Sciences Engineering Peking University Beijing 100871 China

Hydrogen peroxide is not only an important oxidant in itself; it also serves as both sink and temporary reservoir for other important oxidants including HOx （OH and HO2） radicals and O3 in the atmosphere. Its partitioning between gas and aqueous phases in the atmosphere, usually described by its Henry＇s law constant （KH）, significantly influences its role in atmospheric processes. Large discrepancies between the KH values reported in previous work, however, have created uncertainty for atmospheric modelers. Based on our newly developed online instrumentation, we have re-determined the temperature and acidity dependence of KH for hydrogen peroxide at an air pressure of （0.960 ± 0.013） atm （1 atm = 1.01325 × 10^5 Pa）. The results indicated that the temperature dependence of KH for hydrogen peroxide fits to the Van＇t Hoff equation form, expressed as lnKH = a/T - b, and a = -△H/R, where KH is in M/atm （M is mol/L）, T is in degrees Kelvin, R is the ideal gas constant, and AH is the standard heat of solution. For acidity dependence, results demonstrated that the KH value of hydrogen peroxide appeared to have no obvious dependence on decreasing pH level （from pH 7 to pH 1）. Combining the dependence of both temperature and acidity, the obtained a and b were 7024 ± 138 and 11.97 ± 0.48, respectively, AH was （58.40 ± 1.15） kJ/（***）, and the uncertainties represent σ. Our determined KH values for hydrogen peroxide will therefore be of great use in atmospheric models.

关键词： hydrogen peroxide Henry＇s law constant atmosphere acidity

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：