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Co-fermentation of waste activated sludge with food waste for short-chain fatty acids production:effect of pH at ambient temperature

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Frontiers of Environmental Science & Engineering 2011年第4期5卷 623-632页

作者： Leiyu FENG yuanyuan yan Yinguang CHEN State Key Laboratory of Pollution Control and Resources Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China

Effect of pH ranging from 4.0 to 11.0 on cofermentation of waste activated sludge(WAS)with food waste for short-chain fatty acids(SCFAs)production at ambient temperature was investigated in this study.Experimental results showed that the addition of food waste significantly improved the performance of WAS fermentation system,which resulted in the increases of SCFAs production and substrate reduction.The SCFAs production at pH 6.0,7.0,8.0,and 9.0 and fermentation time of 4 d was respectively 5022.7,6540.5,8236.6,and 7911.7 mg COD·L^(-1),whereas in the blank tests(no pH adjustment,pH 8.0(blank test 1),no food waste addition,pH 8.0(blank test 2),and no WAS addition(blank test 3))it was only 1006.9,971.1,and 1468.5 mg COD·L^(-1),respectively.The composition of SCFAs at pH from 6.0 to 9.0 was also different from other conditions and propionic acid was the most prevalent SCFA,which was followed by acetic and n-butyric acids,while acetic acid was the top product under other conditions.At pH 8.0 a higher volatile suspended solids(VSS)reduction of 16.6%for the mixture of WAS and food waste than the sole WAS indicated a synergistic effect existing in fermentation system with WAS and food waste.The influence of pH on the variations of nutrient content was also studied during anaerobic fermentation of the mixture of WAS and food waste at different pH conditions.The release of NH_(4)^(+)-N increased with fermentation time at all pH values investigated except 4.0,5.0 and in blank test one.The concentrations of soluble phosphorus at acidic pHs and in the blank test one were higher than those obtained at alkaline pHs.Ammonia and phosphorus need to be removed before the SCFAsenriched fermentation liquid from WAS and food waste was used as the carbon source.

关键词： waste activated sludge(WAS) food waste cofermentation short-chain fatty acids(SCFAs) pH synergistic effect

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Agent-based dynamic simulation of an electricity market with multilateral bidding

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International Journal of Modeling, Simulation, and Scientific Computing 2019年第3期10卷 15-27页

作者： Jiahui Wu Jidong Wang yuanyuan yan Key Laboratory of the Ministry of Education on Smart Power Grids Tianjin University Tianjin 300072P.R.China Department of Automation Tsinghua University Beijing 100084P.R.China

The electricity market is a complex system in which participants interact and compete with each other,which makes description of them with mathematical models difficult.To solve these difficulties,computer simulation has become one of the main methods for studying electricity market problems.How to establish a reasonable electricity market has always been a major research issue in the electric power industry,for which a key point is the bidding mechanism.Agent-based modeling and a simulation(ABMS)method are used in this paper to study the imperfect competitive electricity market.An agent-based simulation method of multilateral bargaining game theory in the dynamics of the power bidding market is presented,and a multi-agent power market bidding dynamics simulation model based on game theory is established.The dynamic bidding game behavior among the government,power grid companies,power plant companies,and consumer parties is simulated in the market,and the simulation method is realized by Anylogic software.Finally,an agent-based four-party competitive dynamic game simulation in the electricity market is implemented,which provides a theoretical reference for further understanding resource optimization problems in the electricity market.

关键词： Agent-based simulation electricity market game theory

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Establishment of an efficient seed fluorescence reporter-assisted CRISPR/Cas9 gene editing in maize

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Journal of Integrative Plant Biology 2021年第9期63卷 1671-1680页

作者： yuanyuan yan Jinjie Zhu Xiantao Qi Beijiu Cheng Changlin Liu Chuanxiao Xie Institute of Crop Science Chinese Academy of Agricultural SciencesNational Key Facility for Crop Gene Resources and Genetic ImprovementBeijing 100081China School of Life Sciences Anhui Agricultural UniversityHefei 230036China

Genome editing by clustered regularly interspaced short palindromic sequences(CRISPR)/CRISPRassociated protein 9(Cas9)has revolutionized functional gene analysis and genetic improvement.While reporter-assisted CRISPR/Cas systems can greatly facilitate the selection of genome-edited plants produced via stable transformation,this approach has not been well established in seed crops.Here,we established the seed fluorescence reporter(SFR)-assisted CRISPR/Cas9 systems in maize(Zea mays L.),using the red fluorescent Ds RED protein expressed in the endosperm(En-SFR/Cas9),embryos(Em-SFR/Cas9),or both tissues(Em/En-SFR/Cas9).All three SFRs showed distinct fluorescent patterns in the seed endosperm and embryo that allowed the selection of seeds carrying the transgene of having segregated the transgene out.We describe several case studies of the implementation of En-SFR/Cas9,Em-SFR/Cas9,and Em/En-SFR/Cas9 to identify plants not harboring the genomeediting cassette but carrying the desired mutations at target genes in single genes or in small-scale mutant libraries,and report on the successful generation of single-target mutants and/or mutant libraries with En-SFR/Cas9,Em-SFR/Cas9,and Em/En-SFR/Cas9.SFR-assisted genome editing may have particular value for application scenarios with a low transformation frequency and may be extended to other important monocot seed crops.

关键词： CRISPR/Cas9 embryo-specific reporter endosperm-specific reporter genome editing maize seed fluorescence reporter

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From surface loading to precise confinement of polyoxometalates for electrochemical energy storage

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Chinese Chemical Letters 2023年第12期34卷 29-41页

作者： Chongji Wang yanhui Song Wenhua Cong yuanyuan yan Meiling Wang Jiadong Zhou College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Instituteof TechnologyBeijing100081China Instrumental Analysis Center Taiyuan University of TechnologyTaiyuan 030024China

Because of abundant redox activity,broad tunability,and specific atomic structure,polyoxometalates(POMs or POM)clusters have attracted burgeoning interests in electrochemical especially energy stor-age fields.Nevertheless,due to the high solubility and fully oxidized state,they often suffer from elec-trically insulation as well as chemical and electrochemical instability.Traditional noncovalent loading or covalent grafting of POMs on conductive substrates have been successfully performed to overcome this problem.However,severe shedding or agglomeration of POMs arising from weak interactions with substrates or excessive entrapment or weak destruction in conductive supports cause significantly re-duced availability and stability.To this end,precise confinement of POMs into conductive supports has been tried to improve their dispersibility and stability.Herein,recent progress of PoMs from surface loading to precise confinement in the electrochemistry energy storage field is reviewed.Firstly,we il-lustrate the typical non-confinement methods(viz.covalent and non-covalent)for supported POMs in energy storage applications.Secondly,different strategies for precise confinement of PoMs in organic and inorganic materials for related applications are also discussed.Finally,future research directions and opportunities for confined POMs,and derived ultrafine nanostructures are also proposed.This re-view seeks to point out future research directions of supported PoMs in the electrochemistry-related fields.

关键词： Polyoxometalates Non-confinement Confinement Electrochemical energy storage Supercapacitor Battery

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The enhanced electronic communication in ferrocenemethanol molecular cluster based on intermolecular hydrogen-bonding

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Chinese Chemical Letters 2018年第1期29卷 179-182页

作者： Yifan yang Qing Zheng yuanyuan yan Yao Liu Huibo Shao Key Laboratory of Cluster Science (Ministry of Education) and Beijing Key Laboratory of Photoelectronic and Electrophotonic Conversion Materials School of Chemistry and Chemical Engineering Beijing Institute of Technology

This work presents an electrochemical study of enhanced electronic communication based on intermolecular hydrogen-bonding in ferrocenemethanol （described as FcCH2OH） molecular clusters. The enhanced electronic communication in FcCH2OH clusters is confirmed and further investigated by differential-pulse voltammetry and cyclic voltammetry. A key finding is that this enhanced electronic communication increases the standard rate constant of the electron transfer process. These results will provide us with a further understanding of the electronic communication within the ferrocenyl derivariv~ which it ha^pd nn rhp inr^rmnlpcldar hvdrn^en-hnndinct

关键词： Enhanced electronic communicationlntermolecular hydrogen-bondingMolecular clustersElectron transferCyclic voltammetry

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多波地震联合技术精细雕刻隐蔽河道砂体——以四川盆地西北部ZT地区沙溪庙组为例

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天然气工业 2024年第3期44卷 87-96页

作者：冉崎魏玮陈康杨广广戴隽成闫媛媛吕龑马华灵朱讯中国石油西南油气田公司勘探开发研究院中国石油西南油气田公司中国石油西南油气田公司气田开发管理部

四川盆地陆相致密砂岩气资源丰富,是目前天然气增储上产的重要领域,但侏罗系沙溪庙组沙一段河道砂体纵向多期叠置,横向同期交汇且河道砂体类型多样,隐蔽性强,形成了复杂多变的地震反射特征,准确刻画河道砂体难度极大。为了解决四川盆地... 详细信息

四川盆地陆相致密砂岩气资源丰富,是目前天然气增储上产的重要领域,但侏罗系沙溪庙组沙一段河道砂体纵向多期叠置,横向同期交汇且河道砂体类型多样,隐蔽性强,形成了复杂多变的地震反射特征,准确刻画河道砂体难度极大。为了解决四川盆地西北部(以下简称川西北)ZT地区沙溪庙组一段(以下简称沙一段)多期河道砂体及储层刻画不清晰、精度低的问题,采用新采集的三维地震三分量转换横波(PS波)资料,结合PP波叠前数据和常规叠后地震资料,在正演模拟基础上,形成了多波地震联合雕刻河道砂体关键技术,并分析了河道砂体多波地震响应特征随砂体孔隙度的变化规律。研究结果表明:(1)砂体顶界PP波地震响应随孔隙度增大由强波峰转变为强波谷,而PS波地震响应不随物性变化发生极性反转,基于横波对岩性的刻画可有效识别多期隐蔽河道砂体;(2)相较反映横波阻抗变化率的叠前P-G属性,PS波振幅能量更聚焦,雕刻的河道砂体横向展布特征更清晰,边界更清楚;(3)叠前P-G属性具有更高的纵向分辨率,有利于区分叠置砂体,并落实砂体的发育期次。结论认为,多波地震技术联合充分发挥P-G的高分辨率优势确定纵向砂体发育期次,发挥PS波横向连续性优势刻画横向边界,实现了ZT地区沙一段河道砂体的完整精细雕刻,生产应用效果显著,并为该区井位部署和储量升级提供了有力技术支撑,为四川盆地陆相致密砂岩气规模效益开发奠定了坚实的基础,同时有力推进了多波地震勘探技术的发展。

关键词：四川盆地侏罗系沙溪庙组致密砂岩转换横波多波地震勘探河道砂体刻画叠前P-G属性

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奇数链脂肪酸抑制脂多糖诱导的Caco-2细胞炎症反应研究

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中国油脂 2024年第6期49卷 82-90,111页

作者：闫雨蒙张颖马强张杏芳闫媛媛李晓光王慧上海交通大学医学院公共卫生学院上海200025 同济大学附属上海市肺科医院上海200433 上海交通大学医学院仁济临床医学院上海200025

为明确奇数链脂肪酸(OCFA)与人体健康的关系,采用气相色谱-质谱法(GC-MS)检测分析健康人群和结肠癌患者血清中OCFA的分布特征差异,并采用脂多糖(LPS)诱导的Caco-2细胞炎症模型探究OCFA对炎症的抑制效应,包括对细胞活性、促炎因子基因表... 详细信息

为明确奇数链脂肪酸(OCFA)与人体健康的关系,采用气相色谱-质谱法(GC-MS)检测分析健康人群和结肠癌患者血清中OCFA的分布特征差异,并采用脂多糖(LPS)诱导的Caco-2细胞炎症模型探究OCFA对炎症的抑制效应,包括对细胞活性、促炎因子基因表达以及脂肪酸组成的影响。结果表明:健康人群中的OCFA(C15∶0和C17∶0)含量显著高于结肠癌人群;男性以及高龄(59岁以上)结肠癌人群中C15∶0和C17∶0水平偏低;C15∶0和C17∶0对细胞活力无影响,C15∶0能够显著降低LPS刺激后Caco-2细胞中促炎因子TNF-α、IL-8和iNOS的表达,C17∶0能够显著降低促炎因子IL-6、TNF-α、IL-8和iNOS的表达,两种OCFA均能够起到类似于n-3PUFA缓解炎症刺激的作用;两种OCFA(C15∶0和C17∶0)能够在肠道细胞Caco-2中吸收并代谢成C17∶0、C17∶1。综上,OCFA能够调节肠道炎症因子的表达进而抑制肠上皮细胞炎症反应,对肠道健康有潜在的保护作用。

关键词：奇数链脂肪酸 C15∶0 C17∶0 肠道炎症肠道健康

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火炮远方瞄准点法误差分析研究

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火力与指挥控制 2024年第1期49卷 118-123页

作者：韩超闫媛媛刘广生段纬然刘亮陆军工程大学石家庄校区石家庄050003

针对火炮方向瞄准时因周视瞄准镜与火炮回转中心不同心所造成的瞄准误差,使用几何建模方法对方向瞄准过程进行建模,并推导瞄准误差与标定点距离、装定角度和标定点位置之间的函数关系式。通过绘制和分析多组标定点距离、装定角度、标定... 详细信息

针对火炮方向瞄准时因周视瞄准镜与火炮回转中心不同心所造成的瞄准误差,使用几何建模方法对方向瞄准过程进行建模,并推导瞄准误差与标定点距离、装定角度和标定点位置之间的函数关系式。通过绘制和分析多组标定点距离、装定角度、标定点位置和瞄准误差数据图像,总结减小瞄准误差的若干方法。给出了装定角度、标定距离和对应瞄准误差极值之间的多项式拟合关系式,供相关人员使用。

关键词：方向瞄准远方瞄准点瞄准误差分析标定点设置

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生态环境损害救济的路径调适及入典规则安排

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河北工业大学学报（社会科学版） 2024年第1期16卷 70-77页

作者：李义松闫媛媛河海大学法学院江苏南京211100

目前我国生态环境损害救济路径包括以行政命令、行政处罚为主的行政执法路径,政府部门提起的政府索赔路径,以及环境民事公益诉讼路径。多路径并存的制度体系并非井然有序,存在法理基础逻辑障碍、制度衔接不畅、相关主体角色错位等困境... 详细信息

目前我国生态环境损害救济路径包括以行政命令、行政处罚为主的行政执法路径,政府部门提起的政府索赔路径,以及环境民事公益诉讼路径。多路径并存的制度体系并非井然有序,存在法理基础逻辑障碍、制度衔接不畅、相关主体角色错位等困境。构建途径畅通的生态环境损害救济路径,持续改善环境治理,是当前促进我国生态环境保护与治理现代化的重要课题。法典化塑造的特定背景中,生态环境损害救济路径仍面临入典规则如何安排的新挑战。厘清生态环境损害救济路径中行政执法、政府索赔与环境民事公益诉讼的关系,尊重行政执法的首次判断权,以行政执法为首要选择,政府索赔次之,而环境民事公益诉讼作为补充。为保证路径内部逻辑一贯,并处理好路径之间的衔接,必须类型化区分生态环境损害赔偿路径,最大程度发挥制度合力。

关键词：生态环境损害行政执法政府索赔环境民事公益诉讼环境法典

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支链、奇数链脂肪酸与肠道健康的关联性研究

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中国油脂 2024年第7期49卷 54-60,74页

作者：张颖张杏芳闫雨蒙张颖沈旖凝闫媛媛李晓光上海交通大学医学院公共卫生学院上海200025

为明确支链脂肪酸(BCFA)与奇数链脂肪酸(OCFA)对肠道健康的影响,利用气相色谱-质谱联用分析健康人群与肠道疾病患者血液中脂肪酸含量的差异,并应用正交偏最小二乘-判别分析(OPLS-DA)鉴定肠道健康人群的特征脂肪酸。结果表明:健康对照组... 详细信息

为明确支链脂肪酸(BCFA)与奇数链脂肪酸(OCFA)对肠道健康的影响,利用气相色谱-质谱联用分析健康人群与肠道疾病患者血液中脂肪酸含量的差异,并应用正交偏最小二乘-判别分析(OPLS-DA)鉴定肠道健康人群的特征脂肪酸。结果表明:健康对照组、肠道息肉组、结直肠癌组3组人群中共检测出9种BCFA和4种OCFA;BCFA、OCFA含量在健康人群中显著偏高(p<0􀆰05),其中anteiso-C17∶0、C17∶0含量随肠道健康状态恶化呈梯度下降趋势(p<0.05);OPLS-DA共鉴定出anteiso-C17∶0、iso-C17∶0、C18∶1、C18∶0、C16∶0、C14∶06种特征脂肪酸标志物。综上,BCFA和OCFA对肠道健康有潜在的保护作用。

关键词：支链脂肪酸奇数链脂肪酸肠道健康

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