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Potential risks of organic contaminated soil after persulfate remediation:Harmful gaseous sulfur release

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Journal of Environmental Sciences 2024年第1期135卷 1-9页

作者： Yuyang Long Zixiao Wu Xiaodong Ding Jiansong Chen Dongsheng Shen Jiali shentu Cai Hui Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling Zhejiang Engineering Research Center of Non-ferrous Metal Waste RecyclingInstrumental Analysis CenterSchool of Environmental Science and EngineeringZhejiang Gongshang UniversityHangzhou 310012China Shangyu Yingtai Fine Chemical Co. Ltd.Shaoxing 312000China Hangzhou Ecological Environment Monitoring Center Hangzhou 310007China

Persulfate is considered a convenient and efficient remediation agent for organic contaminated soil.However,the potential risk of sulfur into the soil remediation by persulfate remains ignored.In this study,glass bottles with different persulfate dosages and groundwater tables were set up to simulate persulfate remediation of organic pollutants(aniline).The results found sulfate to be the main end-product(83.0%–99.5%)of persulfate remediation after10 days.Moreover,H_(2)S accounted for 93.4%–99.4%of sulfur reduction end-products,suggesting that H_(2)S was the final fate of sulfur.H_(2)S was released rapidly after one to three days at a maximum concentration of 33.0 ppm,which is sufficient to make a person uncomfortable.According to the fitted curve results,H_(2)S concentration decreased to a safe concentration(0.15 ppm)after 20–85 days.Meanwhile,the maximum concentration of methanethiol reached 0.6 ppm.These results indicated that secondary pollution from persulfate remediation could release harmful gases over a long time.Therefore,persulfate should be used more carefully as a remediation agent for soil contamination.

关键词： Gaseous sulfur release H_2S Long period potential risk Organic contaminated soil remediation Persulfate

Research on ECMS Based on Segmented Path Braking Energy Recovery in a Fuel Cell Vehicle

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Energy Engineering 2024年第1期121卷 95-110页

作者： Wen Sun Meijing Li Guoxiang Li Ke Sun shuzhan Bai School of Energy and Power Engineering Shandong UniversityJinan250061China Automotive Research Institute China National Heavy Duty Truck Group Co.Ltd.Jinan250061China

Proton exchange membrane fuel cells are widely regarded as having the potential to replace internal combustion engines in vehicles.Since fuel cells cannot recover energy and have a slow dynamic response,they need to be used with different power sources.Developing efficient energy management strategies to achieve excellent fuel economy is the goal of research.This paper proposes an adaptive equivalent fuel minimum consumption strategy(AECMS)to solve the problem of the poor economy of the whole vehicle caused by the wrong selection of equivalent factors(EF)in traditional ECMS.In this method,the kinematics interval is used to update the equivalent factor by considering the penalty term of energy recovery on SOC changes.Finally,the optimized equivalent factor is substituted into the optimization objective function to achieve efficient energy regulation.Simulation results under the New European Driving Cycle show that compared with the traditional ECMS based on fixed SOC benchmarks,the proposed method improves fuel economy by 1.7%while ensuring vehicle power and increases SOC by 30%.

关键词： Fuel cell PEMFC electric vehicle equivalent consumption minimization strategy

Analysis of the Influence of Geometrical Parameters on the Performance of a Proton Exchange Membrane Fuel Cell

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Fluid Dynamics & Materials Processing 2024年第1期20卷 219-237页

作者： Guodong Zhang Huifang Tao Da Li Kewei Chen Guoxiang Li shuzhan Bai Ke Sun School of Energy and Power Engineering Shandong UniversityJinan250061China Sinotruk Jinan Special Purpose Vehicle Co. Ltd.Jinan250117China

A suitable channel structure can lead to efficient gas distribution and significantly improve the power density of fuel cells.In this study,the influence of two channel design parameters is investigated,namely,the ratio of the channel width to the bipolar plate ridge width(i.e.,the channel ridge ratio)and the channel depth.The impact of these parameters is evaluated with respect to the flow pattern,the gas composition distribution,the temperature field and the fuel cell output capability.The results show that a decrease in the channel ridge ratio and an increase in the channel depth can effectively make the distributions of velocity,temperature and concentration more uniform in each channel and improve the output capability of the fuel cell.An increase in the channel ridge ratio and depth obviously reduces the flow resistance and improves the flow characteristics.

关键词： Hydrogen fuel cell bipolar plate flow channel multiphysics coupling

The life-history trait trade-offs mediated by reproduction and immunity in the brown planthopper,Nilaparvata lugens Stål

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Journal of Integrative Agriculture 2024年第6期23卷 2018-2032页

作者： Dan Sun Hongfeng Wang Jiahui Zeng Qiuchen Xu Mingyun Wang Xiaoping Yu Xuping shentu Zhejiang Provincial Key Laboratory of Biometrology and Inspection&Quarantine College of Life ScienceChina Jiliang UniversityHangzhou 310018China

Reproduction and immune defense are costly functions,and they are expected to tradeoff with each other to drive evolution.The brown planthopper(BPH),Nilaparvata lugens Stål(Hemiptera,Delphacidae),is a global superpest that mostly damages rice crops.Yeast-like symbionts(YLS)exist in the abdominal fat body tissue and are tightly associated with the development,growth,and reproduction of BPH.Our previous research demonstrated that mating behavior promotes the release of YLS from the fat body into the hemolymph in the BPH,thereby triggering an immune response.Additionally,the fitness costs related to life-history traits of BPH(such as survival rate)have a strong dependence on the relative abundance of YLS.However,the possible relationship between reproduction and the immune response in BPH has not been identified.In this study,an omics-based approach was used to analyze the transcriptome of fat body tissues in mated and unmated BPH at 72 h post-eclosion,from which two antimicrobial peptide genes,NlDefensin A(NlDfA)and NlDefensin B(NlDfB),were selected since they were highly expressed in mated BPH.Subsequently,the full-length cDNA sequences of the NlDfA and NlDfB genes were cloned and analyzed.qPCR results showed up-regulation of the NlDfA and NlDfB genes in mated BPH when compared to unmated BPH.Spatial-temporal expression analysis indicated that the NlDfA and NlDfB genes were expressed in all tissues and developmental stages,and they were most highly expressed in the fat body at 24 h post-eclosion.Moreover,the symbionts in BPH were significantly inhibited by the in vitro expression of the NlDfA and NlDfB proteins.Furthermore,RNA interference(RNAi)-mediated suppression of NlDfA and NlDfB dramatically increased the relative abundance of YLS in the fat body,while YLS in the hemolymph decreased significantly.These BPHs also displayed some fitness disadvantages in survival,fecundity,hatchability,and possibly the vertical transmission of YLS from hemolymph to egg.Our results indicated that mating could heighten the immuni

关键词： Nilaparvata lugens reproduction immune defense trade-off

Experimental Study on Gas Flow Uniformity in a Diesel Particulate Filter Carrier

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Fluid Dynamics & Materials Processing 2024年第1期20卷 193-204页

作者： Zhengyong Wang Jianhua Zhang Guoliang Su Peixing Yang Xiantao Fan shuzhan Bai Ke Sun Guihua Wang School of Energy and Power Engineering Shandong UniversityJinan250061China State Key Laboratory of Engines Tianjin UniversityTianjin300072China Weichai Power Emission Solutions Technology Company Limited Weifang261043China China·Shandong·YYO Emission Control System Co. Ltd.Liaocheng252100China

A Diesel Particulate Filter(DPF)is a critical device for diesel engine exhaust products treatment.When using active-regeneration purification methods,on the one hand,a spatially irregular gas flow can produce relatively high local temperatures,potentially resulting in damage to the carrier;On the other hand,the internal temperature field can also undergo significant changes contributing to increase this risk.This study explores the gas flow uniformity in a DPF carrier and the related temperature behavior under drop-to-idle(DTI)condition by means of bench tests.It is shown that the considered silicon carbide carrier exhibits good flow uniformity,with a temperature deviation of no more than 2%with respect to the same radius measurement point at the outlet during the regeneration stage.In the DTI test,the temperature is relatively high within r/2 near the outlet end,where the maximum temperature peak occurs,and the maximum radial temperature gradient is located between r/2 and the edge.Both these quantities grow as the soot load increases,thereby making the risk of carrier burnout greater.Finally,it is shown that the soot load limit of the silicon carbide DPF can be extended to 11 g/L,which reduces the frequency of active regeneration by approximately 40%compared to a cordierite DPF.

关键词： DPF flow uniformity DTI silicon carbide carrier soot load

国家制度优势转化为治理效能的制度执行力考察

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河南社会科学 2024年第7期32卷 41-47页

作者：秦舒展郑州大学马克思主义学院河南郑州450001

制度优势如何有效转化为治理效能,需要关注制度势能、制度性能与制度执行力之间的变量关系。制度优势体现为一种制度势能,需借助制度执行力转化为制度性能,而制度性能作为中介变量并不能自主和自动发挥作用,也需要制度执行力的推动从而... 详细信息

制度优势如何有效转化为治理效能,需要关注制度势能、制度性能与制度执行力之间的变量关系。制度优势体现为一种制度势能,需借助制度执行力转化为制度性能,而制度性能作为中介变量并不能自主和自动发挥作用,也需要制度执行力的推动从而转化为治理效能,因此,制度执行力是实现制度势能转化为制度性能、制度性能转化为治理效能的关键变量。推动制度优势转化为治理效能,应把握制度执行力的内在机理,不断丰富和完善制度设计,以制度优势凸显制度性能;以制度执行力推动制度优势实现制度性能;以制度执行的规范性、协同性和创新性的衔接,实现制度性能转化为治理效能。

关键词：制度势能制度执行力制度性能治理效能

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共犯意思联络的教义学展开

苏州大学学报（法学版） 2024年第1期11卷 123-135页

作者：申屠玚玚北京大学法学院

意思联络是共同犯罪的成立要件,作为一种事实认知活动,是界定共犯行为性质的判断资料,不能与因果性混同。意思联络涉及法秩序对共犯行为法益侵害性的客观初步评价,建立在特定事实与犯罪关联性的基础上,具有与故意过失不同的评价内容。... 详细信息

意思联络是共同犯罪的成立要件,作为一种事实认知活动,是界定共犯行为性质的判断资料,不能与因果性混同。意思联络涉及法秩序对共犯行为法益侵害性的客观初步评价,建立在特定事实与犯罪关联性的基础上,具有与故意过失不同的评价内容。在对故意认定存在扩张倾向的司法现状下,有必要基于行为主义的要求,强调意思联络的独立地位与客观属性。我国刑法采取定罪与量刑分离的双层区分模式,并无对共同正犯的专门规定,共谋与德日刑法中的正犯性评价无关,共同正犯的结果归属应个别进行,没有必要承认共谋共同正犯概念。对意思联络的形成发挥重要作用者是共同正犯,在结果归属阶段,共同正犯与狭义共犯具有不同评价侧重。

关键词：意思联络共同犯罪行为主义共同正犯共谋

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基于5G技术的智能交通系统设计与实现

移动信息 2024年第5期46卷 53-55页

作者：龙舒展广西交科集团有限公司南宁530000

近年来,随着城市的快速发展,交通需求量不断提升,交通污染、拥堵等现象屡见不鲜,对城市的可持续发展造成了较大的影响,因此合理进行城市交通管理势在必行。而基于5G技术的智能交通系统,能为交通管理提供有力的支持。基于此,文中分析了5... 详细信息

近年来,随着城市的快速发展,交通需求量不断提升,交通污染、拥堵等现象屡见不鲜,对城市的可持续发展造成了较大的影响,因此合理进行城市交通管理势在必行。而基于5G技术的智能交通系统,能为交通管理提供有力的支持。基于此,文中分析了5G技术及其在智能交通系统设计中的重要意义,提出了基于5G技术的智能交通系统设计和实现措施,为提升城市交通管理水平提供了助力。

关键词： 5G技术智能交通系统设计实现

燃烧机理构建的极小化反应网络方法:C_(2)燃料燃烧

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高等学校化学学报 2024年第1期45卷 94-106页

作者：申屠江涛李宜蔚陆彦戎李娟琴毛业兵李象远四川大学化学工程学院空天动力燃烧与冷却教育部工程研究中心机械工程学院成都610065

针对目前C_(2)燃料反应机理中存在的诸多问题,本文采用极小化反应网络方法,在特定化学分辨率条件下构建了乙烯、乙烷和乙醇等典型C_(2)燃料的燃烧反应机理.构建的C_(2)单组分机理具有简洁的反应网络,采用可逆反应形式,并对反应方向在形... 详细信息

针对目前C_(2)燃料反应机理中存在的诸多问题,本文采用极小化反应网络方法,在特定化学分辨率条件下构建了乙烯、乙烷和乙醇等典型C_(2)燃料的燃烧反应机理.构建的C_(2)单组分机理具有简洁的反应网络,采用可逆反应形式,并对反应方向在形式上进行了统一.在动力学参数方面,采用经典Arrhenius方程(A,Ea)双参数形式,在保证物理意义的同时有利于参数优化.C_(2)机理构建过程中避免了机理简化步骤,能够大幅减少物种数和反应数.动力学模拟结果表明,构建的C_(2)燃烧反应机理在保持较小尺寸的同时有较高的可靠性,并为机理的实际工程应用降低计算成本带来便利.

关键词：燃烧机理极小化反应网络化学分辨率可逆反应 C2燃料