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Design of an aircraft autonomous traction taxiing system based on hydraulic secondary control

Chinese Journal of Aeronautics 2024年第6期37卷 348-359页

作者： Xiaochao LIU Zhongyi qiu Hao zhang Pengyuan QI Zhenyu WANG Yaoxing SHANG Zongxia JIAO Research Institute for Frontier Science Beihang UniversityBeijing 100083China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083China Ningbo Institute of Technology Beihang UniversityNingbo 315800China Tianmushan Laboratory Xixi Octagon CityYuhang DistrictHangzhou 310023China Science and Technology on Aircraft Control Laboratory Beihang UniversityBeijing 100083China Beijing Tianma Intelligent Control Technology Co. Ltd.Beijing 101399China China Coal Research Institute Beijing 100013China

At present,aircraft taxiing at ground airports needs to be provided with a thrust by the main *** taxiing process is inefficient,has high fuel consumption and serious pollution,and is prone to safety *** this paper,a new configuration of aircraft autonomous traction taxiing system is proposed based on the principle of hydraulic secondary control,in which a hydraulic motor drive device is installed at the front wheels of the aircraft to drive the wheels to rotate forward or *** on this,autonomous taxiing can be realized without relying on the main engines,thus greatly improving airport operation ***,this paper analyzes the influencing factors of the autonomous traction taxiing process,and investigates the parameter matching design of the new configuration ***,this paper develops the ground principle prototype,designs the aircraft longitudinal bonding force observer and the aircraft wheel disturbance moment observer,and proposes the speed control method of the aircraft front wheel autonomous traction taxiing by considering the ground bonding force saturation ***,the ground taxiing test is conducted,and the results show that the new configuration proposed in this paper presents a new solution for aircraft autonomous traction taxiing.

关键词： Autonomous traction taxi-ing Hydraulic secondary control Hydraulic motors Saturation characteristics Disturbance observation Speed control

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波轮式全自动洗衣机刚柔耦合模型的建立

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振动与冲击 2012年第15期31卷 185-189页

作者：陈海卫张秋菊曹毅江南大学机械工程学院无锡214122

刚柔耦合模型是波轮式全自动洗衣机结构设计的基础。为建立这一模型,首先在ANSYS中建立了盛水桶的有限元模型并进行模态分析,进而通过与实验结果的对比验证了有限元模型的正确性。采用修正的Craig-Bampton模态对盛水桶进行动力学建模,... 详细信息

刚柔耦合模型是波轮式全自动洗衣机结构设计的基础。为建立这一模型,首先在ANSYS中建立了盛水桶的有限元模型并进行模态分析,进而通过与实验结果的对比验证了有限元模型的正确性。采用修正的Craig-Bampton模态对盛水桶进行动力学建模,并与刚性模型进行耦合,推导得到系统整体的刚柔耦合模型。最后,采用α方法求解系统DAE方程组,得到了脱水过程中盛水桶的变形信息与载荷信息。将载荷信息反馈给ANSYS进行分析,其计算结果与所得结果进行对比,验证了该模型的有效性。

关键词：洗衣机柔性模型 α方法

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Bioactive compounds in Hericium erinaceus and their biological properties:a review

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Food Science and Human Wellness 2024年第4期13卷 1825-1844页

作者： Yue qiu Genglan Lin Weiming Liu Fuming zhang Robert J.Linhardt Xingli Wang Anqiang zhang College of Food Science and Engineering Zhejiang University of TechnologyHangzhou 310014China Zhejiang Biosan Biotech Co. Ltd.Hangzhou 310052China Department of Chemical and Biological Engineering Center for Biotechnology and Interdisciplinary StudiesRensselaer Polytechnic InstituteTroyNY 12180USA Departments of Chemistry and Chemical Biology and Biomedical Engineering Biological ScienceCenter for Biotechnology and Interdisciplinary StudiesRensselaer Polytechnic InstituteTroyNY 12180USA

Hericium erinaceus is a nutritious edible and medicinal fungi,rich in a variety of functional active ingredients,with various physiological functions such as antioxidation,anticancer,and enhancing *** is also effective in protecting the digestive system and preventing neurodegenerative *** this review paper,we summarize the sources,structures and efficacies of the main active components in *** fruiting body,mycelium,and culture media,and update the latest research progress on their biological activities and the related molecular *** on this information,we provide detailed challenges in current research,industrialization and information on the active ingredients of *** for future studies and new applications of *** are proposed.

关键词： Hericium erinaceus Bioactive compounds Biological activities Antioxidation Neuroprotection Immunoregulation

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Experimental investigation of bed-to-wall heat transfer in fluidized beds of a Geldart B sorbent particle under a full spectrum of fluidization regime

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PARTICUOLOGY 2024年第10期93卷 235-246页

作者： Xu, Chenhuan zhang, Yongmin Wang, Liang zhang, Yiming Yang, Tianlei qiu, Feng Liu, Cenfan Jiang, Shuai Dong, Ke China Univ Petr State Key Lab Heavy Oil Proc Beijing 102249 Peoples R China Beijing DERUNCHEN Environm Protect Technol Co Ltd Beijing 100022 Peoples R China China Special Equipment Inspect & Res Inst Key Lab Special Equipment Safety & Energy Saving S Beijing 100029 Peoples R China

Fluidization technology has been used in CO 2 capture processes, the successful design and operation of the heat exchangers involved in this process require much information on the bed-to-wall heat transfer of the sorbent particles in fluidized states. In this study, the bed-to-wall heat transfer coefficient ( h ) of a solid amine sorbent was measured by a heat transfer probe in a large-scale circulating fluidized bed cold model unit, where full spectrum of fluidization regimes can be realized. The corresponding hydrodynamic signals were also studied by pressure sensors and optical fiber probes to further explain the newly discovered phenomenon. The results show that in a dense bed, due to the counterbalanced effect of time fraction of packet and packet renewal frequency, h of the Geldart B particle reaches a peak within the bubbling fluidized regime, and the radial distribution of h are opposite in bubbling and turbulent fluidized regimes. In a fast fluidization regime, gas convection becomes the dominant factor affecting h when the solids holdup is low enough. Correlations were provided or recommended to guide the design of heat exchangers in the fluidized bed CO 2 capture processes. (c) 2024 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.

关键词： Bed-to-wall heat transfer Solid amine sorbent Geldart B particle Full spectrum of fluidization regime Correlation CONTINUOUS CO2 CAPTURE TEMPERATURE HYDRODYNAMICS TRANSITION TUBE INTEGRATION TRANSPORT

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Problem identification and revitalization strategies for the recovery and reconstruction of traditional villages in the Ms 6.8 Luding Earthquake

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Journal of Mountain Science 2024年第2期21卷 361-379页

作者： HUANG Chao qiu Jian LIU Chun JIANG Rui ZHAO Chuanrong zhang Yi School of Architecture and Research Center of Space Planning and Engineering Design Southwest Jiaotong UniversityChengdu 611756China Sichuan Provincial Rural Construction and Development Center Chengdu 610041China Sichuan Institute of Urban and Rural Construction Chengdu 610043China China Association for Promoting Democracy(CAPD)Sichuan Provincial Committee Chengdu 610016China Sichuan Provincial Architectural Design and Research Institute(SADI) Chengdu 610095China

Post-disaster reconstruction is a topic of global concern,and traditional villages have special heritage attributes and need to face more requirements and obstacles in post-disaster *** paper summarizes four concepts based on the research on post-disaster reconstruction both domestically and internationally,as well as the recovery and reconstruction of cultural *** a field survey of traditional villages in the Ms 6.8 Luding earthquake-stricken area,it is found that there are problems such as insufficient awareness of heritage value,misalignment of scientific reconstruction technology,and insufficient protection of reconstruction elements during the reconstruction *** villages face the risk of declining or even loss of heritage *** order to effectively protect traditional villages and inherit the carrier of regional culture,four targeted reconstruction response strategies are proposed,i.e.,to"establish special planning for traditional village preservation","emphasize recovery of the authenticity of village heritage","ensure elements for village heritage recovery"and"promote the activation and utilization of village heritage",based on the problems discovered during the survey and the four concepts summarized in the research on post-disaster reconstruction of traditional *** research results hope to provide useful reference for ancient cultural areas affected by earthquakes on how to protect cultural heritage during the post-disaster reconstruction process.

关键词： Seismic hazard Decision making Traditional village Cultural heritage protection Post-earthquake recovery and reconstruction Revitalization strategy

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Multi-agent mobile networking observation experiment at the air-sea interface of ocean eddy

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Science China Earth Sciences 2024年第10期67卷 3083-3097页

作者： Yi zhang Dongxiao WANG Li ZHOU Chunhua qiu Yunfei zhang Zhiliang DENG Biao zhang Yunping LIU Yeqiang SHU Fenghua ZHOU Danian LIU Zhengqiu zhang School of Marine Sciences Sun Yat-Sen UniversityZhuhai 519082China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China School of Marine Technology and Geomatics Jiangsu Ocean UniversityLianyungang 222005China Zhuhai Yunzhou Intelligent Technology Co. Ltd.Research and Design CenterZhuhai 519000China School of Automation Nanjing University of Information Science&TechnologyNanjing 210044China School of Marine Sciences Nanjing University of Information Science&TechnologyNanjing 210044China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

Current climate forecasting has advanced to the stage of investigating mesoscale air-sea interactions. Recent studies have identified significant structural differences between the cores and edges of mesoscale eddies;however, the effects of these structural variations on air-sea fluxes and the Marine Atmospheric Boundary Layer(MABL) remain underexplored. Traditional observations often fail to capture the detailed structures of eddies, necessitating enhanced observations at high spatiotemporal resolution for mesoscale eddies. To address this, efforts have been made to develop multi-agent platforms and expendable air-sea interface observation technologies. A task-oriented observation scheme was developed to monitor the spatial characteristics of mesoscale eddies. The South China Sea(SCS) is rich in mesoscale eddies with rapid motion changes, requiring enhanced observations of the air-sea interface using multi-agent mobile networking. An anticyclonic eddy was observed in the eastern region of the Xisha Islands in the SCS, and we examined variations in air-sea fluxes across different regions within the eddy.

关键词： Multi-agent Mobile networking Mesoscale eddy Air-sea interface Collaborative observation

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Transfer RNA-derived fragment tRF-23-Q99P9P9NDD promotes progression of gastric cancer by targeting ACADSB

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2024年第5期25卷 438-450页

作者： Yu zhang Xinliang GU Yang LI Xun LI Yuejiao HUANG Shaoqing ju Medical School of Nantong University Nantong UniversityNantong 226001China Department of Laboratory Medicine Affiliated Hospital of Nantong UniversityNantong 226001China Research Center of Clinical Medicine Affiliated Hospital of Nantong UniversityNantong 226001China Department of Medical Oncology Affiliated Hospital of Nantong UniversityNantong 226001China

Gastric cancer(GC)is one of the most common gastrointestinal *** a newly discovered type of non-coding RNAs,transfer RNA(tRNA)-derived small RNAs(tsRNAs)play a dual biological role in *** previous studies have demonstrated the potential of tRF-23-Q99P9P9NDD as a diagnostic and prognostic biomarker for *** this work,we confirmed for the first time that tRF-23-Q99P9P9NDD can promote the proliferation,migration,and invasion of GC cells in *** dual luciferase reporter gene assay confirmed that tRF-23-Q99P9P9NDD could bind to the 3'untranslated region(UTR)site of acyl-coenzyme A dehydrogenase short/branched chain(ACADSB).In addition,ACADSB could rescue the effect of tRF-23-Q99P9P9NDD on GC ***,we used Gene Ontology(GO),the Kyoto Encyclopedia of Genes and Genomes(KEGG),and Gene Set Enrichment Analysis(GSEA)to find that downregulated ACADSB in GC may promote lipid accumulation by inhibiting fatty acid catabolism and ***,we verified the correlation between ACADSB and 12 ferroptosis genes at the transcriptional level,as well as the changes in reactive oxygen species(ROS)levels by flow *** summary,this study proposes that tRF-23-Q99P9P9NDD may affect GC lipid metabolism and ferroptosis by targeting ACADSB,thereby promoting GC *** provides a theoretical basis for the diagnostic and prognostic monitoring value of GC and opens upnew possibilities for treatment.

关键词： Transfer RNA(tRNA)-derived small RNA(tsRNA) Gastric cancer(GC) Acyl-coenzyme A dehydrogenase short/branched chain(ACADSB) Molecular mechanism Treatment Ferroptosis

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Permian integrative stratigraphy,biotas,paleogeographical and paleoclimatic evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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Science China Earth Sciences 2024年第4期67卷 1107-1151页

作者： Shuzhong SHEN Yichun zhang Dongxun YUAN Haipeng XU Qi ju Hua zhang Quanfeng ZHENG Mao LUO zhangshuai HOU State Key Laboratory for Mineral Deposits Research School of Earth Sciences and Engineering and Frontiers Science Center for Critical Earth Material CyclingNanjing UniversityNanjing 210023China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Nanjing 210049China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China

The Permian Period was a critical time interval during which various blocks of the Qinghai-Tibetan Plateau have experienced profound and complex paleogeographical *** supercontinent Pangea was formed to its maximum during this interval,hampering a global east-to-west trending equatorial warm ocean ***,a semi-closed Tethys Ocean warm pool formed an eastward-opening oceanic embayment of Pangea,and became an engine fostering the evolutions of organisms and environmental changes during the Paleozoic-Mesozoic *** and preserved fossil groups have proved extremely useful in understanding such changes and the evolutionary histories of the Qinghai-Tibetan *** distributed Permian deposits and fossils from various blocks of the Qinghai-Tibetan Plateau exhibited varied characteristics,reflecting these blocks’different paleolatitude settings and drifting *** Himalaya Tethys Zone south to the Yarlung Zangbo suture zone,located in the northern Gondwanan margin,yields fossil assemblages characterized by cold-water organisms throughout the Permian,and was affliated to those of the *** of the exotic limestone blocks within the Yarlung Zangbo suture zone are Guadalupian(Middle Permian)to Early Triassic in *** exotic limestone blocks bear fossil assemblages that have transitional affinities between the warm Tethys and cold Gondwanan regions,suggesting that they most probably represent seamount deposits in the Neo-Tethys *** the Asselian to Sakmarian(Cisuralian,also Early Permian),the Cimmerian microcontinents in the northern part of Gondwana preserved glacio-marine deposits of Asselian to Sakmarian,and contained typical Gondwana-type cold-water *** the middle Cisuralian(~290-280 Ma),the Cimmerian microcontinents rifted off from the Gondwanaland,and drifted northward allometrically due to the active magmatism of the Panjal Traps in the northern margin of the Indian *** slices of micro

关键词： Permian Tethys Ocean Qinghai-Tibetan Plateau Biotas Paleogeography

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Distributed IRS-Aided DF Relaying Systems:Performance Analysis and Optimization

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China Communications 2024年第6期21卷 129-145页

作者： Sun Qiang Qian Panpan Chen Xiaomin ju Jinjuan Wang jue zhang Jiayi School of Information Science and Technology Nantong UniversityNantong 226019China Nantong Research Institute for Advanced Communication Technologies Nantong 226019China School of Electronic and Information Engineering Nantong Vocational UniversityNantong 226007China School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China

Intelligent reflecting surface(IRS)is a newly emerged and promising paradigm to substantially improve the performance of wireless communications by constructing favorable communication channels via properly tuning massive reflecting *** paper considers a distributed IRS aided decode-and-forward(DF)relaying system over Nakagami-m fading *** on a tight approximation for the distribution of the received signalto-noise ratio(SNR),we first derive exact closed-form expressions of the outage probability,ergodic capacity,and energy efficiency for the considered ***,we propose the optimal IRS configuration considering the energy efficiency and pilot ***,we compare the performance between the distributed IRS-aided DF relaying and multi-IRS-only systems,and verify the analytical results by using monte carlo simulations.

关键词： configuration energy efficiency ergodic capacity intelligent reflecting surface IRS outage probability

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基于改进Canny算子的葵花籽边缘检测方法

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食品与机械 2015年第5期31卷 36-38页

作者：徐灿张秋菊江南大学机械工程学院

针对葵花籽一类不规则形体的边缘检测问题,采用传统的Canny算法有许多局限。文章对其提出三点改进:1基于梯度统计差分的自适应阀值法,克服了传统算法在目标与背景灰度变化较大时边缘检测会丢失部分边缘的不足,有效提高信噪比;2基于梯度... 详细信息

针对葵花籽一类不规则形体的边缘检测问题,采用传统的Canny算法有许多局限。文章对其提出三点改进:1基于梯度统计差分的自适应阀值法,克服了传统算法在目标与背景灰度变化较大时边缘检测会丢失部分边缘的不足,有效提高信噪比;2基于梯度方向的端点延伸法,弥补了Canny算法在连接分析后得到较多断线边缘的缺陷;3基于最长曲线的区域包围法,可去除背景中短小边缘,从而去除目标外围的干扰,实现葵花籽区域的精确定位。试验结果证明,在高复杂背景下改进的Canny算法在葵花籽边缘检测上取得了很好的效果。

关键词： Canny算法自适应高阀值边缘延伸区域包围葵花籽分拣

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