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Piezoelectric sensing method for segmental joint contact stress during shield tunnel construction

Underground Space 2024年第4期17卷 82-99页

作者： Guodong jiang Minghao Dai Guozhu Zhang limin Gao Institute of Geotechnical Engineering Southeast UniversityNanjing 211189China Nanjing Metro Group Co.Ltd Nanjing 210000China No.4 Construction Company of China Petroleum Pipeline Engineering Co.Ltd Langfang 065000China

The emergence of curved shield tunnels poses a significant construction *** the quality of the segment assembly is not guaranteed,many segment cracks and damage will result from the stress *** the contact stresses between segmental joints is necessary to improve the quality of segments assembled for shield tunnel *** difluoride(PVDF)piezoelectric material was chosen for the sensor because it can convert contact stresses into electrical signals,allowing the state of the segmental joints to be effectively *** matches the working environment between the segmental joints of the shield tunnel,where flexible structures such as rubber gaskets and force transfer pads are *** study proposes a piezoelectric sensing method for segmental joints in shield tunnels and conducts laboratory tests,numerical analyses,and field tests to validate the feasibility of the *** results indicate that the PVDF film sensor can effectively sense the entire compression process of the gasket with different amounts of *** piezoelectric cable sensor can effectively sense the joint offset direction of the *** differently shaped sections,the variation in the force sensed by the piezoelectric cable sensors was different,as verified by numerical *** the field test,it was found that the average contact stress between the segmental joints was in the range of 1.2–1.8 MPa during construction of the curved shield *** location of the segmental joints and the type of segment affect the contact stress *** field monitoring results show that piezoelectric sensing technology can be successfully applied during assembly of the segments for effective sensing of the contact stress.

关键词： Shield tunnel Segmental joint Contact stress Piezoelectric sensor

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Future evolution of automated demand response system in smart grid for low-carbon economy

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Journal of Modern Power Systems and Clean Energy 2015年第1期3卷 72-81页

作者： Huaguang YAN Bin LI Songsong CHEN Ming ZHONG Dezhi LI limin jiang Guixiong HE China Electric Power Research Institute Beijing 100192China School of Electric and Electronic Engineering North China Electric Power UniversityBeijing 102206China

Smart grid construction is an important carrier and an effective way to promote the development of lowcarbon *** response(DR)is commonly regarded as an important core technology in smart grid field,and it reflects the flexible and interactive features of the core business in smart *** is the developing direction of automated demand response(ADR)technology,and its main features are the standardization of information exchange,together with the intelligence of decision-making and the automation of *** technology can improve the efficiency of the whole power system and enhance the ability to accept new energy *** paper analyzes the role of demand response in improving efficiency and low-carbon energy saving power *** automated demand response system architecture is investigated,and the ADR roadmap of commercial/industrial and residential customer is *** key technologies for ADR system are analyzed,including demand response strategy,information exchanging model,measurement and verification techniques,and multi-agent scheduling *** ensure the interoperability between the grid side and the user side,the ADR business in smart grid user interface standards is concluded to support further demand side management project.

关键词： Demand response Information model System architecture Load shifting

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Morphological and molecular examination of the ciliate family Lagynusidae(Protista,Ciliophora,Prostomatea)with descriptions of two new genera and two new species from China

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Marine Life Science & Technology 2023年第2期5卷 178-195页

作者： limin jiang Congcong Wang Saleh A.Al-Farraj Hunter N.Hines Xiaozhong Hu College of Fisheries and Key Laboratory of MaricultureMinistry of EducationOcean University of ChinaQingdao 266003China Institute of Evolution and Marine Biodiversity Ocean University of ChinaQingdao 266003China Department of Zoology College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Harbor Branch Oceanographic Institute Florida Atlantic UniversityFort PierceFL 34982USA

Ciliates in the class Prostomatea play an important role in the global microbial loop due to their signifcant abundances and broad feeding strategies at the foundation of food *** their importance in ecosystems,the taxonomy and systematics of this group of ciliates has long been poorly understood,with this being especially true for members of the family *** we examine four lagynusids collected from sandy beaches in China,using silver-staining and 18S rRNA gene sequencing *** investigations revealed two new genera and two new species and provided details for two little known forms:Penardella marina ***.,***.,Apolagynus cucumis(as reported by Penard.Études sur les infusoires d’eau *** and Cie,Genève,1922)***.,***.,Lagynus minutus ***.,and Lagynus elegans(Engelmann in Z Wiss Zool 11:347-393,1862)Quennerstedt(Acta Univ Lund 4:1-48,1867).Penardella *** be morphologically distinguished by having more than three dikinetidal perioral *** *** from the closely related genus Lagynus in the absence of a conspicuous neck-like *** ciliature of Apolagynus cucumis is revealed here for the frst time,which demonstrates the classifcation of this species within ***,Apolagynus binucleatus(jiang et al.,2021)*** established according to the new *** results of our phylogenetic analyses based on the 18S rRNA gene support the establishment of two new genera and indicate that Lagynusidae is monophyletic,which further strengthens its valid taxonomic status.

关键词： Ciliate Morphology New genus New species Phylogeny 18S rRNA gene

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当代大学校园更新的六个议题

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当代建筑 2024年第9期 32-36页

作者：王涤非江立敏杨一秀岳超同济大学建筑设计研究院(集团)有限公司建筑设计四院同济大学建筑设计研究院(集团)有限公司同济大学建筑设计研究院(集团)有限公司建筑设计四院建筑四所

本文通过研究世界一流大学的更新案例与发展趋势,结合国内大学新建校园和更新校园的实践,提出了当代大学校园更新的六个主要议题,即从校园与城市的关系、更新中的精神重塑、系统的高效链接、增强学术与教学、提升生活与学习、可持续的... 详细信息

本文通过研究世界一流大学的更新案例与发展趋势,结合国内大学新建校园和更新校园的实践,提出了当代大学校园更新的六个主要议题,即从校园与城市的关系、更新中的精神重塑、系统的高效链接、增强学术与教学、提升生活与学习、可持续的校园更新,阐释并归纳校园更新的设计策略和发展趋势,探索适合我国大学校园的绿色更新之路。

关键词：校园更新城校关系校园精神重塑交通系统的高效链接绿色低碳

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2019—2023年急性呼吸道感染儿童肺炎支原体流行病学特征分析:一项单中心回顾性研究

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临床儿科杂志 2024年第6期42卷 485-490页

作者：李铭一沈袁恒陈峰李媛睿张敏华王娟娟沈立松蒋黎敏上海交通大学医学院附属新华医院检验科上海200092

目的探讨上海单中心COVID-19大流行前、中、后期急性呼吸道感染(ARTI)患儿肺炎支原体(MP)及其他病原体阳性率的变化。方法回顾性分析2019年1月1日至2023年12月30日在上海交通大学医学院附属新华医院行呼吸道五联检和流感病毒三联检的A... 详细信息

目的探讨上海单中心COVID-19大流行前、中、后期急性呼吸道感染(ARTI)患儿肺炎支原体(MP)及其他病原体阳性率的变化。方法回顾性分析2019年1月1日至2023年12月30日在上海交通大学医学院附属新华医院行呼吸道五联检和流感病毒三联检的ARTI患儿的临床资料。结果共纳入ARTI患儿91 825例次,男48 729例次、女43 096例次,中位年龄为5.0(3.0~8.0)岁。疫情前组14 096例次,呼吸道病原体阳性5 126例次(36.4%);疫情中组13 366例次,阳性2 963例次(22.2%);疫情后组64 363例次,阳性33 510例次(52.1%)。疫情前、中、后组ARTI患儿之间男性比例、年龄分布、各病原体阳性率差异均有统计学意义(P6岁患儿比例较高,而疫情中组0~3岁比例较高(P6岁比例较高,疫情中组0~3岁比例较高(P<0.014)。结论在2019—2023年期间,以MP为代表的各种ARTI相关病原体的流行病学特征发生了一定变化,MP的好发年龄分布和季节流行病学特征发生了显著改变。

关键词： COVID-19 急性呼吸道感染肺炎支原体

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Dynamics of synthetic yeast chromosome evolution shaped by hierarchical chromatin organization

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National Science Review 2023年第5期10卷 240-250页

作者： Sijie Zhou Yi Wu Yu Zhao Zhen Zhang limin jiang Lin Liu Yan Zhang Jijun Tang Ying-Jin Yuan Frontiers Science Center for Synthetic Biology (Ministry of Education) Tianjin University Key Laboratory of Systems Bioengineering(Ministry of Education) School of Chemical Engineering and TechnologyTianjin University Institute for Systems Genetics NYU Langone Health School of Computer Science and Technology College of Intelligence and ComputingTianjin University Epigenetic Group Frasergen Bioinformatics Co.Ltd. Department of Computer Science University of South Carolina

Synthetic genome evolution provides a dynamic approach for systematically and straightforwardly exploring evolutionary *** Chromosome Rearrangement and Modification by LoxP-mediated Evolution(SCRaMbLE) is an evolutionary system intrinsic to the synthetic yeast genome that can rapidly drive structural ***,we detect over 260 000 rearrangement events after the SCRaMbLEing of a yeast strain harboring 5.5 synthetic yeast chromosomes(synⅡ,synⅢ,synⅤ,circular synⅥ,synⅨR and synⅩ).Remarkably,we find that the rearrangement events exhibit a specific landscape of *** further reveal that the landscape is shaped by the combined effects of chromatin accessibili and spatial contact *** rearrangements tend to occur in 3D spatially proximal and chromatin-accessible *** enormous numbers of rearrangements mediated by SCRaMbLE provide a driving force to potentiate directed genome evolution,and the investigation of the rearrangement landscape offers mechanistic insights into the dynamics of genome evolution.

关键词： synthetic biology genome rearrangement hierarchical chromatin organization synthetic yeast genome SCRaMbLE Saccharomyces cerevisiae

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Ferric ion-triggered surface oxidation of galena for efficient chalcopyrite-galena separation

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International Journal of Minerals,Metallurgy and Materials 2024年第2期31卷 261-267页

作者： Qiancheng Zhang limin Zhang Feng jiang Honghu Tang Li Wang Wei Sun School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization Changsha 410083China School of Resource and Environment Hunan University of Technology and BusinessChangsha 410083China

The efficient separation of chalcopyrite(CuFeS2)and galena(PbS)is essential for optimal resource ***,find-ing a selective depressant that is environmentally friendly and cost effective remains a *** various techniques,such as mi-croflotation tests,Fourier transform infrared spectroscopy,scanning electron microscopy(SEM)observation,X-ray photoelectron spec-troscopy(XPS),and Raman spectroscopy measurements,this study explored the use of ferric ions(Fe^(3+))as a selective depressant for *** results of flotation tests revealed the impressive selective inhibition capabilities of Fe^(3+)when used *** analysis showed that Fe^(3+)significantly reduced the adsorption of isopropyl ethyl thionocarbamate(IPETC)on the galena surface while having a minimal impact on *** analysis using SEM,XPS,and Raman spectra revealed that Fe^(3+)can oxidize lead sulfide to form compact lead sulfate nanoparticles on the galena surface,effectively depressing IPETC adsorption and increasing surface *** findings provide a promising solution for the efficient and environmentally responsible separation of chalcopyrite and galena.

关键词： galena chalcopyrite ferric ions flotation separation surface oxidation

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Prediction of Coefficient of Restitution for Impact Elastoplastic Spheres Considering Finite Plate Thickness

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Chinese Journal of Mechanical Engineering 2024年第4期37卷 183-193页

作者： Yunfeng Fan Hao Wang Tao Zhou limin Zou Zhinong jiang Minghui Hu State Key Laboratory of High-end Compressor and System Technology Beijing University of Chemical TechnologyBeijing 100029China China Ship Research and Development Academy Beijing 100101China Key Lab of Engine Health Monitoring-Control and Networking of Ministry of Education Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of High-End Mechanical Equipment Health Monitoring and Self-Recovery Beijing University of Chemical TechnologyBeijing 100029China

Collisions between objects are a relatively common phenomenon in *** of collision processes can greatly contribute to solving problems such as impact-rub faults and particle *** coefficient of restitution is a critical parameter in the analysis of collision *** experiments have shown that the coefficient of restitution is closely related to the plate thickness,and the smaller the plate thickness,the more inaccurate the coefficient of restitution predicted by the existing model,which seriously affects the process of collision *** remedy this shortcoming,this paper proposes a plate thickness influence factor with the ratio of sphere diameter to plate thickness as the *** plate thickness influence factor can optimize the coefficient of restitution model to effectively predict the coefficient of restitution of impacting elastoplastic spheres with finite plate ***,the validity of the new model is verified using a large amount of experimental data.

关键词： Collision Coefficient of restitution Energy loss Sphere

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岩石力学公共实验课程教学项目的建设与思考

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高等建筑教育 2024年第5期33卷 142-148页

作者：王智德江俐敏胡静夏元友谢全敏武汉理工大学土木工程与建筑学院湖北武汉430070 武汉职业技术学院建筑工程学院湖北武汉430074

岩石力学实验课是一门为补充岩石力学理论而开设的实践性课程。结合武汉理工大学土木工程专业研究生培养计划,以岩石力学公共实验课程教学项目为例,从该课程开设背景和目的出发,阐述实验课程教学体系、课程内容建设过程,以及教学方法和... 详细信息

岩石力学实验课是一门为补充岩石力学理论而开设的实践性课程。结合武汉理工大学土木工程专业研究生培养计划,以岩石力学公共实验课程教学项目为例,从该课程开设背景和目的出发,阐述实验课程教学体系、课程内容建设过程,以及教学方法和教学手段,并构建了教学质量保证体系。对实验课程教学建设模式进行总结和思考,提出课程教学后期建设需完善的几个要点。结果表明,该实验课程建设实施方案可行,建设成果能较好地应用于研究生课程的具体实践,能较好地提升岩土工程专业研究生的教育质量,在某种程度上促进学科建设与发展。

关键词：岩石力学实验教学课程建设课程体系研究生培养

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城市换热站热泵补热系统优化运行研究

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电力需求侧管理 2024年第1期26卷 101-107页

作者：蒋利民李昊张思瑞卜凡鹏马美秀李拓苏娟中国电力科学研究院有限公司北京100192 北京智慧能源研究院北京102218 中国农业大学信息与电气工程学院北京100083

为推动清洁能源供暖,提高北方城市供暖的质量和效率,提出了一种城市换热站热泵补热系统的优化运行策略。首先,对城市换热站热泵补热系统设备进行建模;然后,构建热泵补热系统与电网的互动场景,包括响应峰谷平电价和参与调峰辅助服务市场... 详细信息

为推动清洁能源供暖,提高北方城市供暖的质量和效率,提出了一种城市换热站热泵补热系统的优化运行策略。首先,对城市换热站热泵补热系统设备进行建模;然后,构建热泵补热系统与电网的互动场景,包括响应峰谷平电价和参与调峰辅助服务市场;接着,建立系统运行成本最低、热网稳定性最优的双目标优化模型,并将其转为单目标优化问题,采用粒子群优化算法进行求解;最后,通过算例进行4种供热方案的对比分析,验证所提模型的经济性和低碳性,为城市供暖的低碳化转型提供了新思路。

关键词：换热站热泵电补热优化运行

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