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Performance Enhancement of Parabolic Trough Collector by Using Homogenizer and Spiral

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Journal of Thermal Science 2024年第2期33卷 658-674页

作者： LI Peijing LIU Taixiu QIN Yuanlong zheng Zhimei ZHAO kai LIU Qibin School of Energy Powerand Mechanical EngineeringNorth China Electric Power UniversityBeijing102206China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Science Beijing100049China Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei230027China Research Institute of Science and Technology of China Three Gorges Group Corporation Beijing100038China

In conventional parabolic trough collectors(PTCs),sunlight is concentrated at the bottom of the absorber tube,resulting in a significant circumferential temperature gradient across the absorber tube,heat loss and thermal deformation,which affects the safety and thermal performance of *** this study,a new receiver with homogenizer and spiral(RHS) is proposed,achieving the optical and thermal synergy to ameliorate the thermal deformation of the absorber tube and enhance thermal efficiency.A plane structure homogenizer is designed to improve uniformity of the concentrated solar flux of absorber tube through second *** combination with the spiral,it improves the optical-thermal efficiency of the PTC by enhancing heat exchange between the fluid and the backlight side of the absorber *** performance of the collector is numerically studied by building a three-dimensional coupled light-thermal-structure *** results show that the thermal deformation of the RHS is reduced by more than 96% and the optical-thermal efficiency is improved by 1.2%-0.63% compared with conventional receivers(CRs) under the same inlet temperature *** proposed receiver is validated to be effective in reducing thermal deformation and improving optical-thermal efficiency.

关键词： parabolic trough collector homogenizer thermal deformation spiral

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碳纤维增强复合材料在航空航天领域的应用

聚酯工业 2024年第3期37卷 71-73页

作者：吕淑扬郑凯赵英男李福海中车成型科技(青岛)有限公司山东青岛266000

碳纤维增强复合材料在航空航天领域广泛应用,涵盖飞机结构、发动机、航天器等方面。其在飞机结构中轻量、高强的特性提高了飞机性能,同时在发动机和航天器中的应用,如天线罩、次级结构件和热防护层,为提高航天器的稳定性和耐高温能力提... 详细信息

碳纤维增强复合材料在航空航天领域广泛应用,涵盖飞机结构、发动机、航天器等方面。其在飞机结构中轻量、高强的特性提高了飞机性能,同时在发动机和航天器中的应用,如天线罩、次级结构件和热防护层,为提高航天器的稳定性和耐高温能力提供了先进材料解决方案。未来,高性能和多尺度复合材料将是发展的趋势,为航空航天领域带来更多创新。

关键词：碳纤维复合材料航空航天飞机结构

Intermittent disturbance mechanical behavior and fractional deterioration mechanical model of rock under complex true triaxial stress paths

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International Journal of Mining Science and Technology 2024年第1期34卷 117-136页

作者： Zhi zheng Hongyu Xu kai Zhang Guangliang Feng Qiang Zhang Yufei Zhao State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Key Laboratory of Disaster Prevention and Structural Safety of Ministry of EducationCollege of Civil Engineering and ArchitectureGuangxi UniversityNanning 530004China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100080China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China

Mechanical excavation,blasting,adjacent rockburst and fracture slip that occur during mining excavation impose dynamic loads on the rock mass,leading to further fracture of damaged surrounding rock in three-dimensional high-stress and even causing ***,a novel complex true triaxial static-dynamic combined loading method reflecting underground excavation damage and then frequent intermittent disturbance failure is *** triaxial static compression and intermittent disturbance tests are carried out on *** effects of intermediate principal stress and amplitude on the strength characteristics,deformation characteristics,failure characteristics,and precursors of monzogabbro are analyzed,intermediate principal stress and amplitude increase monzogabbro strength and tensile fracture *** increases in microseismic parameters during rock loading can be precursors for intermittent rock *** on the experimental result,the new damage fractional elements and method with considering crack initiation stress and crack unstable stress as initiation and acceleration condition of intermittent disturbance irreversible deformation are proposed.A novel three-dimensional disturbance fractional deterioration model considering the intermediate principal stress effect and intermittent disturbance damage effect is established,and the model predicted results align well with the experimental *** sensitivity of stress states and model parameters is further explored,and the intermittent disturbance behaviors at different f are *** study provides valuable theoretical bases for the stability analysis of deep mining engineering under dynamic loads.

关键词： True triaxial static and disturbance test Mechanical properties Failure mechanism and precursor Intermittent disturbance effect Fractional mechanical model

Plastics-to-syngas photocatalysed by Co-Ga2O3 nanosheets

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National Science Review 2022年第9期9卷 230-237页

作者： Jiaqi Xu Xingchen Jiao kai zheng Weiwei Shao Shan Zhu Xiaodong Li Junfa Zhu Yang Pan Yongfu Sun Yi Xie Hefei National Laboratory for Physical Sciences at Microscale National Synchrotron Radiation Laboratory University of Science and Technology of China Key Laboratory of Green Chemistry &Technology Ministry of Education College of Chemistry Sichuan University Institute of Energy Hefei Comprehensive National Science Center

Plastics take hundreds of years to degrade naturally,while their chemical degradation typically requires high temperature and ***,we first utilize solar energy to realize the sustainable and efficient plastic-to-syngas conversion with the aid of water at ambient *** an example,the commercial plastic bags could be efficiently photoconverted into renewable syngas by Co-Ga2O3nanosheets,with hydrogen and carbon monoxide formation rates of 647.8 and 158.3μmol *** situ characterizations and labelling experiments unveil water is photoreduced into hydrogen,while non-recyclable plastics including polyethylene bags,polypropylene boxes and polyethylene terephthalate bottles are photodegraded into carbon dioxide,which is further selectively photoreduced into carbon ***-depth investigation illustrates that the efficiency of syngas production mainly depends on the carbon dioxide reduction process and hence photo catalysts of high carbon dioxide reduction activity should be designed to promote the efficiency of plastic-to-syngas conversion in the *** concept for the photoreforming of non-recyclable plastics into renewable syngas helps to eradicate ’white pollution’ and alleviate the energy crisis simultaneously.

关键词： commercial plastics syngas photoconversion CO2 reduction ambient conditionsion

A seismogram digitization and database management system

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Acta Seismologica Sinica(English Edition) 2001年第3期14卷 333-341页

作者： LIU zheng-kai Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei China Seismological Bureau of Shanghai Shanghai China Institute of Geophysics China Seismological Bureau Beijing China Seismological Bureau of Anhui Province Hefei China

This paper introduces a 'Seismogram Digitization and Database Management System' (SDDMS), which is developed using Delphi3, and present the key technique of automatically extracting wave data from paper seismograms. The system have various functions, such as paper seismogram digitization, database management and data analysis, etc. With this system it is possible to analyze historical paper seismograms using modern computers. Application of this system will be of help to the progress in earthquake prediction and seismological researchers.

关键词： seismogram digitization database management wave data extraction P315.63

Structure design and coordinated motion analysis of bionic crocodile robot

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Biomimetic Intelligence & Robotics 2024年第2期4卷 50-62页

作者： Jun Wang Jingya zheng Yuhang Zhao kai Yang School of Information and Control Engineering China University of Mining and TechnologyXuzhou 221116China

Crocodiles,one of the oldest and most resilient species on Earth,have demonstrated remarkable locomotor abilities both on land and in water,evolving over millennia to adapt to diverse *** this study,we draw inspiration from crocodiles and design a highly biomimetic crocodile robot equipped with multiple degrees of freedom and articulated trunk *** design is based on comprehensive analysis of the structural and motion characteristics of real *** bionic crocodile robot has a problem of limb-torso incoordination during *** solve this problem,we used the D-H method for both forward and inverse kinematics analysis of the robot's legs and *** a series of simulation experiments,we investigated the robot's motion stability,fault tolerance,and adaptability to environments in two motor patterns:with and without spine and tail *** experimental results show that the bionic crocodile robot exhibits superior motion performance when the spine and tail cooperate with the *** study not only demonstrates the potential of biomimicry in robotics but also underscores the significance of understanding how nature's designs can inform and enhance technological innovations.

关键词： Bionic crocodile robot Kinematic modeling Motion simulation Multipart coordination

右美托咪定对小鼠肾脏缺血再灌注肾小管和微循环损伤的机制和影响

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医药论坛杂志 2024年第7期45卷 679-683页

作者：赵伟新夏贵山李正凯金小高郑州大学附属郑州中心医院麻醉与围术期医学科郑州450000

目的探讨右美托咪定(DEX)对小鼠肾脏缺血再灌注(I/R)肾小管和微循环损伤的机制和影响。方法将雄性C57BL/6小鼠分为对照组、I/R组、DEX组和I/R-DEX组各10只;对照组不进行任何处理;I/R组用血管钳将左肾动静脉夹闭40 min后再灌注3 h;DEX组... 详细信息

目的探讨右美托咪定(DEX)对小鼠肾脏缺血再灌注(I/R)肾小管和微循环损伤的机制和影响。方法将雄性C57BL/6小鼠分为对照组、I/R组、DEX组和I/R-DEX组各10只;对照组不进行任何处理;I/R组用血管钳将左肾动静脉夹闭40 min后再灌注3 h;DEX组输注10μg/kg盐酸右美托咪定;I/R-DEX组在缺血开始时输注10μg/kg盐酸右美托咪定后同I/R组处理。比较4组氧化状态参数、肾功能参数、肾脏氧合变量和组织学表现。结果I/R组超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和谷胱甘肽(GSH),以及肾皮质(CμPO_(2))、外髓质(MμPO_(2))和肾静脉(PrvO_(2))微血管氧张力低于对照组和DEX组,I/R-DEX组上述氧化状态参数和肾脏氧合变量低于对照组和DEX组,但高于I/R组。I/R组丙二醛(MDA),血尿素氮(BUN)、血清肌酐(Scr)、肿瘤坏死因子α(TNF-α)和胱抑素C(Cys C),以及组织学损伤评分高于对照组和DEX组,I/R-DEX组上述肾功能参数和组织学损伤评分高于对照组和DEX组,但低于I/R组。镜下I/R组可观察到广泛的间质出血,皮质损伤,肾小球细胞减少和萎缩,皮质小管出现上皮细胞脱落,I/R-DEX组肾小球形态正常,小管和间质区显示轻微变性。结论缺血开始时输注10μg/kg DEX可改善小鼠氧化状态、微循环状态和I/R相关的肾损伤,对肾脏缺血再灌注具有保护作用。

关键词：右美托咪定缺血再灌注微循环肾脏

Learning accurate template matching with differentiable coarseto-fine correspondence refinement

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Computational Visual Media 2024年第2期10卷 309-330页

作者： Zhirui Gao Renjiao Yi zheng Qin Yunfan Ye Chenyang Zhu kai Xu College of Computer National University of Defense TechnologyChangsha 410073China

Template matching is a fundamental task in computer vision and has been studied for *** plays an essential role in manufacturing industry for estimating the poses of different parts,facilitating downstream tasks such as robotic *** methods fail when the template and source images have different modalities,cluttered backgrounds,or weak *** also rarely consider geometric transformations via homographies,which commonly exist even for planar industrial *** tackle the challenges,we propose an accurate template matching method based on differentiable coarse-tofine correspondence *** use an edge-aware module to overcome the domain gap between the mask template and the grayscale image,allowing robust *** initial warp is estimated using coarse correspondences based on novel structure-aware information provided by *** initial alignment is passed to a refinement network using references and aligned images to obtain sub-pixel level correspondences which are used to give the final geometric *** evaluation shows that our method to be significantly better than state-of-the-art methods and baselines,providing good generalization ability and visually plausible results even on unseen real data.

关键词： template matching differentiable homography structure-awareness transformers

Anoctamin家族中钙激活氯离子通道调节剂筛选及应用研究进展

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中国药理学与毒理学杂志 2024年第6期38卷 445-454页

作者：吴明达洪啟元兰月娇姚岚习诗婷刘雪莹高俊涛郑锴郝峰吉林医药学院检验学院吉林吉林132013 吉林医药学院公共卫生学院吉林吉林132013 吉林省人民医院吉林长春130021 北华大学医学技术学院吉林吉林132013 吉林医药学院基础医学院吉林吉林132013

钙激活氯离子通道(CaCC)是一类能通过胞内钙离子激活转运氯离子的通道蛋白,其主要在神经元和肌细胞中参与调节膜电位、细胞内钙平衡和细胞兴奋性等重要的生理作用。Anoctamin(Ano)家族中Ano1是最经典的CaCC,Ano1的靶向调节剂对癌症、囊... 详细信息

钙激活氯离子通道(CaCC)是一类能通过胞内钙离子激活转运氯离子的通道蛋白,其主要在神经元和肌细胞中参与调节膜电位、细胞内钙平衡和细胞兴奋性等重要的生理作用。Anoctamin(Ano)家族中Ano1是最经典的CaCC,Ano1的靶向调节剂对癌症、囊性纤维化、高血压、腹泻和哮喘等疾病具有潜在治疗作用。自2008年Ano1首次被发现后,先后出现了多种CaCC特异性调节剂的筛选方法,主要包括基于荧光蛋白的高通量初级筛选、电生理膜片钳技术和虚拟筛选,进而发现了多种药理学作用不同的小分子调节剂。本文综述了目前较为主流的筛选方法的原理和优缺点,并对迄今发现的Ano1特异性调节剂的化学结构和潜在的应用进展进行综述。

关键词：钙激活氯离子通道 Anoctamin Ano1 Ano2 高通量筛选特异性调节剂