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The Coiling of Split Dandelion Scape Induced by Cell Hygroscopicity

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Acta Mechanica Solida Sinica 2021年第3期34卷 393-403页

作者： Chen Zhang Ting Qiao kenan zhou Qi Zhang Meiying Hou Institute of Applied Mechanics College of Mechanical and Vehicle EngineeringTaiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of Material Strength and Structural Impact Taiyuan University of TechnologyTaiyuan 030024China Institute of Physics Chinese Academy of SciencesBeijing 100080China

It is of great significance to study the water absorption and expansion of cells,which are essential for the growth and life regulation of plants,not only for understanding the complex life phenomena of plants,but also for the manufacture of biomimetic *** main purpose of this study is to shed light on the mechanism of a novel coiling phenomenon of the split dandelion scape soaked in water and the high concentration mannitol *** discovered that the difference between water absorption/dehydration capacities of inner cells and lateral cells of the split dandelion scape generates asymmetric expansion/contraction between inner and lateral layers,resulting two opposite coiled *** to the deformable hypothesis of the thermal expansion model,the water absorption-induced cell expansion model was proposed to explain the coiling process of the split dandelion *** the simulation and experimental results revealed that the coiling of dandelion scape is strongly depended on the response of cells to the stimulation of the solution *** considerable potential load bearing capacity of plants,the coiling phenomenon can be an inspiration to the designs of soft robots and bionic sensors for humidity control.

关键词： Dandelion scape Coiled pattern Cell hygroscopicity Asymmetric deformation Expansive material model

Development of a key-variable-based parallel HVAC energy predictive model

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Building Simulation 2022年第7期15卷 1193-1208页

作者： Huajing Sha Peng Xu Chengchu Yan Ying Ji kenan zhou Feiran Chen Terminus(Shanghai)Information Technology Co. LTDShanghai 200062China Deportment of Mechanical and Energy Engineering Tongji UniversityShanghai 201804China Department of Urban Construction Nanjing Tech UniversityNanjing 211816China Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology Beijing University of TechnologyBeijing00124China China Southern Power Grid Guangdong Foshan Power Supply Bureau GuangdongChina

Building heating,ventilation,and air conditioning(HVAC)systems consume large amounts of energy,and precise energy prediction is necessary for developing various energy-efficiency *** prediction using data-driven models has received increasing attention in recent ***,two types of driven models are used for building energy prediction:sequential and parallel predictive *** latter uses the historical energy of the target building as training data to predict future energy ***,for newly built buildings or buildings without historical data records,the energy can be estimated using the parallel model,which employs the energy data of similar buildings as training *** second predictive model is seldom studied because the model input feature is difficult to identify and ***,we propose a novel key-variable-based parallel HVAC energy predictive *** model has informative input features(including meteorological data,occupancy activity,and key variables representing building and system characteristics)and a simple architecture.A general key-variable screening toolkit which was more versatile and flexible than present parametric analysis tools was developed to facilitate the selection of key variables for the parallel HVAC energy predictive model.A case study is conducted to screen the key variables of hotel buildings in eastern China,based on which a parallel chiller energy predictive model is trained and *** average cross-test error measured in terms of the coefficient of variation of the root mean square error(CV-RMSE)and normalized mean bias error(NMBE)of the parallel chiller energy predictive model is approximately 16%and 8.3%,which is acceptable for energy prediction without using historical energy data of the target building.

关键词： HVAC energy prediction data-driven model sequential predictive model parallel predictive model key-variable screening sensitivity analysis

Parameter sensitivity analysis of the axial stability for a marine flexible pipe

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Petroleum 2024年第3期10卷 548-556页

作者： Liping Tang Jiaxin Zou kenan Song Yongheng Shi Li Liu School of Mechatronic Engineering Southwest Petroleum UniversityChengdu610500China School of Engineering University of AberdeenAberdeenAB243UEUK Oil&Gas Control Center National Petroleum and Natural Gas Pipeline Network Group Co.Ltd.Beijing100020China

Marine unbonded flexible pipes serve as the most essential equipment in offshore oil and gas exploration and *** compressive loads during installation or in service in the complex marine environment usually lead to buckling failure.A flexible pipe is a composite structure with multiple functional layers,of which the tensile armor layer plays a key role with regard to the response of the pipe subjected to axial *** this paper,a simplified three-dimensional finite element model is developed,focusing on the tensile layer and replacing the carcass layer,pressure sheath layer,and pressure armor layer by a cylindrical rigid body to reduce computational *** using this model,the buckling failure modes of the tensile armor layer(in particular the birdcaging phenomenon)are *** key parameters that affect the stability of the flexible pipe under axial compression and torsion are emphasized,and their effects on its axial and torsional stiffness are compared and *** results show that both the lay angle of the steel wires and the interlayer friction coefficient have a significant influence on the axial and torsional stiffness of the pipe,whereas the damaged length of the outer sheath has virtually no effect.

关键词： Flexible pipe Tensile armor Buckling failure Key parameters Stiffness

Development of a novel dual-functional lateral flow assay for on-site detection of clenbuterol

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Development of a novel dual-functional lateral flow assay fo...

Dynamic Forecasting of Traffic Event Duration in Istanbul:A Classification Approach with Real-Time Data Integration

中国化学会第十七届全国有机分析与生物分析学术研讨会

作者： FU Qiangqiang zhou kenan LAN Caifeng LIANG Jiajie SHI Congying TANG Yong Department of Bioengineering Guangdong Province Key Laboratory of Molecular Immunology and Antibody EngineeringJinan University Institute of translational medicine Jinan University

Recently,more sensitive methods for analysis of clenbuterol（CL） are required,because of potential risk and illegal use of CL as a hazard to human *** flow assays（LFAs） have been used as a reliable,rapid,and cost effective on-site screening technique for the simultaneous determination of ***,the available lateral flow assay for CL requires a competitive format,leading to low sensitivity of detection when judged by naked *** this study,we reported a novel dual-functional LFA for monitoring CL in terms of fluorescence-quenching effect of gold nanoparticles（AuNPs）.The most important feature of this novel LFA is its dual function as a fluorescence assay under excitation light,but under natural light as an AuNPs *** is apparent that signal intensity of the T-line is associated with elevated level of *** the "turn on" mode when results observed by naked eyes with excitation light,the sensitivity of detection reached 0.04 ng/***,in "turn off" mode using a traditional AuNPs LFAs,results are determined under natural light,the sensitivity decreased to 5 ng/*** novel LFAs could be used for a variety of small analytes such as pesticides,persistent organic pollutants,explosives,toxins,medicinal and abused drugs,hormones,etc.

关键词： Lateral flow assays Dual-functional Fluorescence quenching Clenbuterol

来源： cnki会议评论

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Computers, Materials & Continua 2024年第8期80卷 2259-2281页

作者： Mesut Ulu Yusuf Sait Türkan kenan Menguc Ersin Namlı Tarık Kucukdeniz Occupational Health and Safety Department Bandirma Onyedi Eylul UniversityBalikesir10200Türkiye Department of Industrial Engineering Istanbul University-CerrahpasaIstanbul34320Türkiye Department of Industrial Engineering Istanbul Technical UniversityIstanbul34467Türkiye

Today,urban traffic,growing populations,and dense transportation networks are contributing to an increase in traffic *** incidents include traffic accidents,vehicle breakdowns,fires,and traffic disputes,resulting in long waiting times,high carbon emissions,and other undesirable *** is vital to estimate incident response times quickly and accurately after traffic incidents occur for the success of incident-related planning and response *** study presents a model for forecasting the traffic incident duration of traffic events with high *** proposed model goes through a 4-stage process using various features to predict the duration of four different traffic events and presents a feature reduction approach to enable real-time data collection and *** the first stage,the dataset consisting of 24,431 data points and 75 variables is prepared by data collection,merging,missing data processing and data *** the second stage,models such as Decision Trees(DT),K-Nearest Neighbour(KNN),Random Forest(RF)and Support Vector Machines(SVM)are used and hyperparameter optimisation is performed with *** the third stage,feature selection and reduction are performed and real-time data are *** the last stage,model performance with 14 variables is evaluated with metrics such as accuracy,precision,recall,F1-score,MCC,confusion matrix and *** RF model outperforms other models with an accuracy of 98.5%.The study’s prediction results demonstrate that the proposed dynamic prediction model can achieve a high level of success.

关键词： Traffic event duration forecasting machine learning feature reduction shapley additive explanations(SHAP)

Integrated Stratigraphy and Mineralogy of the Doushantuo Formation in Weng’an,South China,and Implications for Ediacaran Phosphogenesis

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Journal of Earth Science 2024年第2期35卷 476-503页

作者： Liangxuan Jiao Zhenbing She Dominic Papineau Yaguan Zhang Matthew S.Dodd kenan Cao Qun Chen Guoyong Chen State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan430078China School of Earth Sciences China University of GeosciencesWuhan430047China London Centre for Nanotechnology University College London17-19 Gordon StreetLondonWC1E 6BTUK Department of Earth Sciences University College LondonLondonWC1E 6BTUK Centre for Planetary Science University College London and Birkbeck CollegeLondonWC1E 7HXUK Innovation Center of Ore Resources Exploration Technology in the Region of Bedrock Ministry of Natural Resources of People’s Republic of China’Guiyang550000China Guizhou Bureau of Geology and Mineral Exploration and Development Guiyang550000China

The Ediacaran–Cambrian Phosphogenic Episode is the Earth’s first true phosphogenic event and resulted in worldwide phosphate deposits,which occurred during the processes of the Neoproterozoic Oxygenation *** Ediacaran Doushantuo Formation(ca.635–551 Ma)of Weng’an area in central Guizhou,South China,contains two economic phosphorite beds(the Lower and Upper Phosphorite Beds).This paper presents a detailed stratigraphic,sedimentological and mineralogical study of multiple outcrop and drill core sections of the Doushantuo Formation across the Weng’an area,and identified 11 lithofacies and 4 types of phosphatic *** differences in lithofacies and grain types between the upper and lower phosphate deposits are observed,indicating that the two sets of phosphate deposits are the products of two distinct phosphogenic *** Lower Phosphorite Bed mainly consists of banded and laminated phosphorites,contains micro-oncoids formed by microbially-mediated precipitation and peloids formed by in-situ chemically oscillating reactions,indicating a biochemical and chemical enrichment of phosphorus to sediments during the Early Ediacaran *** Upper Phosphorite Bed is mainly composed of carbonaceous,massive,and stromatolitic phosphorites,contains bioclasts(phosphatized spheroidal fossils),and intraclasts formed by hydrodynamic agitation,suggesting that the major accesses of phosphorus to sediments were the remineralization of organic *** of the two economic phosphorite beds was controlled by two sea-level *** differences have also been documented in contemporaneous phosphate-bearing successions in Brazil and Mangolia,indicating a significant shift in global phosphogenic mechanism during the early and middle Ediacaran,which may be due to the changes in redox conditions in seawater,associated with the Neoproterozoic Oxygenation *** regional active P-cycle processes could produce more free oxygen,which may have contributed to the up

关键词： phosphorite lithofacies phosphatic grains phosphogenic paragenesis phosphorus cycle mineralogy

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基于用户效益的电力需求响应算法研究

供用电 2020年第7期37卷 30-36,43页

作者：周克楠广东电网有限责任公司佛山供电局广东佛山528000

智能电网与互联网、人工智能、深度学习等新技术的不断深化发展,让以用户经济效益为中心的需求响应越来越成为供电服务与电力需求侧管理的核心。基于用户经济效益的电力需求响应研究,不仅要满足电网安全稳定运行和优化资源分配,更重要... 详细信息

智能电网与互联网、人工智能、深度学习等新技术的不断深化发展,让以用户经济效益为中心的需求响应越来越成为供电服务与电力需求侧管理的核心。基于用户经济效益的电力需求响应研究,不仅要满足电网安全稳定运行和优化资源分配,更重要的是从用户角度出发,建立用户经济效益与需求响应的模型。首先,介绍基于用户经济效益的电力需求响应管理,提出一个典型的用户响应场景,并对电力需求响应条件下的用户效益进行建模;接着,对用户效益的最优化问题进行理论分析,论证了该问题最优化解需要满足的条件;然后,提出了一个动态的分布式算法,证明不仅能够得出最优化解,而且可实现线性条件的计算量,从而实现分布式计算能力。所研究的内容证明了在一定条件下的算法收敛性,同时提出了一般应用条件下的算法适用性。仿真结果显示该算法能够实现最优化解,并且解具有收敛性。

关键词：需求侧管理负荷响应效益函数分布式算法凸优化

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基于纳什均衡的需求响应多用户策略研究

电子测试 2020年第4期31卷 43-45页

作者：周克楠广东电网公司佛山供电局

随着能源互联网的出现和智能电网的发展,使得电能供给与电能需求能够更紧密的联系,也促进了电力交易市场条件下需求响应的信息化和智能化,用户根据自身情况在需求响应市场上进行出价与竞争,也更好的反映了电能的市场价值。本文结合智能... 详细信息

随着能源互联网的出现和智能电网的发展,使得电能供给与电能需求能够更紧密的联系,也促进了电力交易市场条件下需求响应的信息化和智能化,用户根据自身情况在需求响应市场上进行出价与竞争,也更好的反映了电能的市场价值。本文结合智能电网下的需求响应市场,描述了多用户对电能竞争的一般场景与模型,从理论和算法上分析用户出价与市场调节的最优化问题,在给定的一般情况下,证明了存在一个纳什均衡,使得市场竞价能得到一个最终解的集合,实现用户竞争后的稳定解,同时给出了优化问题解的一个高效算法。

关键词：能源互联网智能电网电力市场纳什均衡策略优化算法

Operation and Management of Electrical Equipment in Iron and Steel Enterprises

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Frontiers of Metallurgical Industry

Frontiers of Metallurgical Industry 2024年第1期2卷 5-8页

作者： Wen Liao kenan Yang College of Metallurgy and Materials Engineering Chongqing University of Science and Technology

How to ensure the reliable operation of the complex and huge electrical system composed of a large number of electrical equipment in iron and steel enterprises?Combined with working experience,the author introduces four main factors affecting the normal operation of equipment,analyzes five main problems existing in the operation and management of electrical equipment,and puts forward corresponding improvement measures,so as to improve the management level of electrical equipment in iron and steel enterprises.

关键词： iron and steel enterprises electrical equipment operation management