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Investigation of spatiotemporal distribution and formation mechanisms of ozone pollution in eastern Chinese cities applying convolutional neural network

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Journal of Environmental Sciences 2025年第2期148卷 126-138页

作者： Qiaoli Wang Dongping Sheng Chengzhi Wu Xiaojie Ou Shengdong Yao Jingkai Zhao Feili li wei li Jianmeng Chen 无 College of Environment Zhejiang University of TechnologyHangzhou 310032China Key Laboratory of Biomass Chemical Engineering of the Ministry of Education Institute of Industrial Ecology and EnvironmentCollege of Chemical and Biological EngineeringZhejiang University(Zijingang Campus)Hangzhou 310027China Trinity Consultants Inc.(China office)Hangzhou 310012China Zhejiang University of Science&Technology Hangzhou 310023China

Severe ground-level ozone(O_(3))pollution over major Chinese cities has become one of the most challenging problems,which have deleterious effects on human health and the sustainability of *** study explored the spatiotemporal distribution characteristics of ground-level O_(3) and its precursors based on conventional pollutant and meteorological monitoring data in Zhejiang Province from 2016 to ***,a high-performance convolutional neural network(CNN)model was established by expanding the moment and the concentration variations to general ***,the response mechanism of O_(3) to the variation with crucial influencing factors is explored by controlling variables and interpolating target *** results indicated that the annual average MDA8-90th concentrations in Zhejiang Province are higher in the northern and lower in the *** the wind direction(WD)ranges from east to southwest and the wind speed(WS)ranges between 2 and 3 m/sec,higher O_(3) concentration prone to *** different temperatures(T),the O_(3) concentration showed a trend of first increasing and subsequently decreasing with increasing NO_(2) concentration,peaks at the NO_(2) concentration around 0.02mg/m^(3).The sensitivity of NO_(2) to O_(3) formation is not easily affected by temperature,barometric pressure and dew point ***,there is a minimum IRNO_(2) at each temperature when the NO_(2) concentration is 0.03 mg/m^(3),and this minimum IRNO_(2) decreases with increasing *** study explores the response mechanism of O_(3) with the change of driving variables,which can provide a scientific foundation and methodological support for the targeted management of O_(3) pollution.

关键词： Ozone Spatiotemporal distribution Convolutional neural network Ozone formation rules Incremental reactivity

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Pressure-Dependent Thermal Network Model for Press-Pack Power Modules with Prognostics of Mechanical Status

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CSEE Journal of Power and Energy Systems 2025年第1期11卷 424-439页

作者： Yao Chang Yu zhou Ankang Zhu Haoze Luo Wuhua li Chushan li Francesco Iannuzzo Xiangning He College of Electrical Engineering Zhejiang UniversityHangzhou310027China Zhejiang University–University of Illinois at Urbana-Champaign Institute Zhejiang UniversityHaining314400China Department of Energy Technology Aalborg UniversityAalborg 9220Denmark

The press-pack power module with multi-chip layout has drawn increasing attention from industry and academia with its thermal analysis becoming an essential ***,the pressure-dependent thermal variables,such as thermal contact resistance and thermal coupling resistance,are often *** this paper,a pressure-dependent thermal network model is developed to characterize the thermal performance and mechanical status of press-pack power *** including the thermal contact resistance and thermal coupling resistance as the function of pressure,the proposed model ensures a more precise thermo-mechanical evaluation inside the press-pack power *** influence of pressure on self-heating effects and thermal coupling effects of power modules is studied using the knowledge of elastic mechanics.A press-pack prototype with variable pressure loads is ***,thermal experiments under different pressures on chips are conducted and the pressure-variable temperature responses of the thermal network are ***,the feasibility of the proposed thermal network model is validated.A cost-effective prognostic method on the mechanical status of press-pack power module is also achieved.

关键词： Mechanical status press-pack power module pressure-dependent model thermal network.

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Highly anticipated natural diterpenoids as an important source of new drugs in 2013-2023

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Chinese Chemical Letters 2025年第1期36卷 119-136页

作者： Yingjie Wang Peng Tang Wenchao Tu Qi Gao Cuizhu Wang Luying Tan lixin Zhao Hongye Han liefeng Ma Kouharu Otsuki weilie Xiao Wenli Wang Jinping liu Yong li Zhajun Zhan wei li Xianli zhou Ning li School of Traditional Chinese Materia Medica Key Laboratory of Innovative Traditional Chinese Medicine for Major Chronic Diseases of Liaoning provinceKey Laboratory for TCM Material Basis Study and Innovative Drug Development of Shenyang CityShenyang Pharmaceutical UniversityShenyang 110016China Key Laboratory of Medicinal Chemistry for Natural Resource Ministry of EducationYunnan Characteristic Plant Extraction LaboratoryYunnan Key Laboratory of Research and Development for Natural ProductsSchool of Pharmacy and School of Chemical Science and TechnologyState Key Laboratory for Conservation and Utilization of Bio-Resources in YunnanYunnan UniversityKunming 650091China School of Pharmacy Nantong UniversityNantong 226001China School of Pharmaceutical Sciences Jilin UniversityChangchun 130021China State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100050China College of Pharmaceutical Sciences Zhejiang University of TechnologyHangzhou 310014China Faculty of Pharmaceutical Sciences Toho UniversityFunabashiChiba 274-8510Japan School of life Science and Engineering Southwest Jiaotong UniversityChengdu 610031China

This review covers the structures of diterpenoids,including chain(72),monocyclic(9),labdane-type(67),clerodane-type(127)abietane-type(716),ent-kaurane-type(89),grayanane-type(331),ingenanetype(55),tigliane-type(154),daphnane-type(237),and aconitine-type diterpene alkaloids(265)with rich biological activities reported in *** the drugs in clinical use or under clinical investigation of diterpenoids and leading compounds were summarized.

关键词： Natural diterpenoids Structures Bioactivities Druggability Leading compounds New drugs

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Defects‑Rich Heterostructures Trigger Strong Polarization Coupling in Sulfides/Carbon Composites with Robust Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第1期17卷 528-547页

作者： Jiaolong liu Siyu Zhang Dan Qu Xuejiao zhou Moxuan Yin Chenxuan Wang Xuelin Zhang Sichen li Peijun Zhang Yuqi zhou Kai Tao Mengyang li Bing wei Hongjing Wu Mengyang li Bing wei Hongjing Wu School of Physics Xidian UniversityXi’an 710071People’s Republic of China School of Advanced Materials and Nanotechnology State Key Discipline Laboratory of Wide Band Gap Semiconductor TechnologyXidian UniversityXi’an 710071People’s Republic of China School of Microelectronics Xidian UniversityXi’an 710071People’s Republic of China School of Telecommunication Engineering Xidian UniversityXi’an 710071People’s Republic of China MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China The Ministry of Education Key Laboratory of Micro and Nano Systems forAerospace School of Mechanical EngineeringNorthwestern PolytechnicalUniversityXi’an 710072People’s Republic of China

Defects-rich heterointerfaces integrated with adjustable crystalline phases and atom vacancies,as well as veiled dielectric-responsive character,are instrumental in electromagnetic *** methods,however,constrain their delicate ***,an innovative alternative is proposed:carrageenan-assistant cations-regulated(CACR)strategy,which induces a series of sulfides nanoparticles rooted in situ on the surface of carbon *** unique configuration originates from strategic vacancy formation energy of sulfides and strong sulfides-carbon support interaction,benefiting the delicate construction of defects-rich heterostructures in M_(x)S_(y)/carbon composites(M-CAs).Impressively,these generated sulfur vacancies are firstly found to strengthen electron accumulation/consumption ability at heterointerfaces and,simultaneously,induct local asymmetry of electronic structure to evoke large dipole moment,ultimately leading to polarization coupling,i.e.,defect-type interfacial ***“Janus effect”(Janus effect means versatility,as in the Greek two-headed Janus)of interfacial sulfur vacancies is intuitively confirmed by both theoretical and experimental investigations for the first ***,the sulfur vacancies-rich heterostructured Co/Ni-CAs displays broad absorption bandwidth of 6.76 GHz at only 1.8 mm,compared to sulfur vacancies-free CAs without any dielectric *** defects-rich heterostructures,this one-pot CACR strategy may steer the design and development of advanced nanomaterials,boosting functionality across diverse application domains beyond electromagnetic response.

关键词： Defects-rich heterointerfaces Sulfides Polarization coupling Electromagnetic wave absorption

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Observations of Runaway Electron Generation during Disruptions on HL-2A Tokamak

Southwestern Institute of Physics Annual Report

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Southwestern Institute of Physics Annual Report 2004年第1期 6-8页

作者： YANG Qingwei YANG Jinwei SONG Xianying CUI Zhengying li wei zhou Hangyu DING Xuantong

The major disruption can not only lead to the great heat loads and produce the large electromagnetic force on the first wall and divertor plates, but also can generate the runaway electrons. The runaway electrongenera... 详细信息

关键词： Runaway electron Disruption

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杭州湾跨海大桥南航道桥主塔承台施工

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桥梁建设 2006年第3期36卷 55-57,70页

作者：李维洲中港二航局杭州湾大桥项目部浙江嘉兴314201

杭州湾跨海大桥南航道桥主塔承台为哑铃形结构,平面尺寸大。针对本海域恶劣的施工环境,大型承台采用分块施工方案,以降低海上施工难度,规避施工风险。

关键词：斜拉桥桥塔承台桥梁施工

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风区停留动车组的纵向气动力仿真及防溜计算

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中国铁道科学 2017年第4期38卷 107-114页

作者：李荧周伟石邹亮刘堂红葛盛昌中南大学交通运输工程学院湖南长沙410075 乌鲁木齐铁路局新疆乌鲁木齐830011 乌鲁木齐铁路局动车运用所新疆乌鲁木齐830011 乌鲁木齐铁路局科学技术研究所新疆乌鲁木齐830011

为研究高速动车组在风区的防溜安全问题,首先建立8车编组的CRH2G型动车组的数值仿真模型,计算不同风速、不同风向角下动车组的纵向气动力;然后建立动车组在坡道停留时的力学模型,按照动车组在纵向气动力、起动阻力、停放制动力及铁鞋制... 详细信息

为研究高速动车组在风区的防溜安全问题,首先建立8车编组的CRH2G型动车组的数值仿真模型,计算不同风速、不同风向角下动车组的纵向气动力;然后建立动车组在坡道停留时的力学模型,按照动车组在纵向气动力、起动阻力、停放制动力及铁鞋制动力的综合作用下能够保持停放稳定不溜逸的要求,确定不同工况下需要为动车组设置铁鞋的数量。结果表明:风致纵向气动力的最不利风向角约为30°;在动车组停放制动正常且超载状态下,仅在风速17级(60m·s^(-1))和坡度22‰的工况下需要为头车设置1个铁鞋,其他工况下均无需为动车组设置铁鞋;在动车组停放制动失效且超载状态下,当动车组停留在22‰坡度的线路上时,风速自0级直至14级(47.5m·s^(-1))工况下至少需要设置4个铁鞋,风速达15~17级(51.7~60.0m·s^(-1))工况下,至少需要设置5个铁鞋;在最不利的17级(60.0m·s^(-1))环境风条件下仿真计算出的铁鞋设置数量低于现行铁总办法规定的铁鞋设置数量。

关键词：风区铁路纵向气动力动车组遛逸防溜安全

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BEV-Locator:an end-to-end visual semantic localization network using multi-view images

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Science China(Information Sciences) 2025年第2期68卷 134-150页

作者： Zhihuang ZHANG Meng XU Wenqiang zhou Tao PENG liang li Stefan POSLAD School of Vehicle and Mobility Tsinghua University School of Information Technology & Management University of International Business and Economics Qcraft Inc. School of Electronic Engineering and Computer Science Queen Mary University of London

Accurate localization ability is fundamental in autonomous driving. Traditional visual localization frameworks approach the semantic map-matching problem with geometric models, which rely on complex parameter tuning and thus hinder large-scale deployment. In this paper, we propose BEV-Locator: an end-to-end visual semantic localization neural network using multi-view camera images. Specifically, a visual BEV(bird-eye-view) encoder extracts and flattens the multi-view images into BEV space. While the semantic map features are structurally embedded as map query sequences. Then a cross-model transformer associates the BEV features and semantic map queries. The localization information of ego-car is recursively queried out by cross-attention modules. Finally, the ego pose can be inferred by decoding the transformer outputs. This end-to-end model speaks to its broad applicability across different driving environments, including high-speed scenarios. We evaluate the proposed method in large-scale nuScenes and Qcraft datasets. The experimental results show that the BEV-Locator is capable of estimating the vehicle poses under versatile scenarios, which effectively associates the cross-model information from multi-view images and global semantic maps. The experiments report satisfactory accuracy with mean absolute errors of 0.052 m, 0.135 m and 0.251° in lateral, longitudinal translation and heading angle degree.

关键词： visual localization semantic map bird-eye-view transformer pose estimation

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Efficient OpenMP Based Z-curve Encoding and Decoding Algorithms

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Computers, Materials & Continua 2025年第1期82卷 1313-1327页

作者： Zicheng zhou Shaowen Sun Teng liang Mengjuan li Fengling Xia School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China Faculty of Information Engineering and Automation Kunming University of Science and TechnologyKunming650500China School of Communications Information Engineering Yunnan Communications Vocational and Technical CollegeKunming650500China library Yunnan Normal UniversityKunming650500China Faculty of Civil Aviation and Aeronautics Kunming University of Science and TechnologyKunming650500China

Z-curve’s encoding and decoding algorithms are primely important in many Z-curve-based *** bit interleaving algorithm is the current state-of-the-art algorithm for encoding and decoding *** simple,its efficiency is hindered by the step-by-step coordinate shifting and bitwise *** tackle this problem,we first propose the efficient encoding algorithm LTFe and the corresponding decoding algorithm LTFd,which adopt two optimization methods to boost the algorithm’s efficiency:1)we design efficient lookup tables(LT)that convert encoding and decoding operations into table-lookup operations;2)we design a bit detection mechanism that skips partial order of a coordinate or a Z-value with consecutive 0s in the front,avoiding unnecessary iterative *** propose order-parallel and point-parallel OpenMP-based algorithms to exploit the modern multi-core *** results on discrete,skewed,and real datasets indicate that our point-parallel algorithms can be up to 12.6×faster than the existing algorithms.

关键词： Z-curve lookup table OpenMP bit detection mechanism

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Precise gradient separation of nanoparticles using reduced graphene oxide-polyoxomolybdate membranes

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Science China Chemistry 2025年第1期68卷 209-216页

作者： Yixin Yang Wanlei Zhao Ruoxuan Zheng Hongqiang li wei Chen Yu-Fei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Quzhou Institute for Innovation in Resource Chemical Engineering Quzhou 324000China

The purification and size sieving of nanoparticles(NPs)represents a significant scientific ***,the rGO-polyoxometalates(POMs=PMo_(12),Mo_(132)and Mo_(368))membranes were fabricated successfully via a simple and scalable POMsassisted in-situ photoreduction *** the mass ratio of rGO to PMo_(12)was 1:30,the resultant rGO-PMo_(12)membranes with highly ordered and uniform nanochannels of 1.0 nm can be obtained,which showed an accurate carbon quantum dots(CQDs)separation with a cut-off size approximately 1.0 *** increase of the size of the interlayered POMs from PMo_(12)(1.0 nm),{Mo132}(2.9 nm)to{Mo_(368)}(3.8 nm),the resultant rGO-PMo_(12),rGO-Mo_(132)and rGO-Mo_(368)exhibited precise gradient separation of CQDs and Au nanoparticles by size exclusion *** results pave a promising way to construct new twodimensional(2D)membranes for highly efficient size-selective separation.

关键词： reduced graphene oxide polyoxometalates membranes gradient separation nanoparticles

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