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Estimation of speed-related car body acceleration limits with quantile regression

Railway Sciences 2024年第5期3卷 575-592页

作者： Jianli Cong Hang Zhang Zilong Wei Fei Yang Zaitian Ke Tao Lu, Rong Chen Ping Wang Zili Li China Academy of Railway Sciences Corporation Limited Infrastructure Inspection Research InstituteBeijingChina School of Civil Engineering Beijing Jiaotong UniversityBeijingChina and Planning and Standard Research InstituteNational Railway AdministrationBeijingChina MOE Key Laboratory of High-Speed Railway Engineering Southwest Jiaotong UniversityChengduChina Department of Engineering Structures Delft University of TechnologyDelftNetherlands

Purpose–This study aimed to facilitate a rapid evaluation of track service status and vehicle ride comfort based on car body ***,a low-cost,data-driven approach was proposed for analyzing speed-related acceleration limits in metro ***/methodology/approach–A portable sensing terminal was developed to realize easy and efficient detection of car body ***,field measurements were performed on a 51.95-km metro *** from 272 metro sections were tested as a case study,and a quantile regression method was proposed to fit the control limits of the car body acceleration at different speeds using the measured ***–First,the frequency statistics of the measured data in the speed-acceleration dimension indicated that the car body acceleration was primarily concentrated within the constant speed stage,particularly at speeds of 15.4,18.3,and 20.9 m/***,resampling was performed according to the probability density distribution of car body acceleration for different speed domains to achieve data ***,combined with the traditional linear relationship between speed and acceleration,the statistical relationships between the speed and car body acceleration under different quantiles were *** concluded the lateral/vertical quantiles of 0.8989/0.9895,0.9942/0.997,and 0.9998/0.993 as being excellent,good,and qualified control limits,respectively,for the lateral and vertical acceleration of the car *** addition,regression lines for the speedrelated acceleration limits at other quantiles(0.5,0.75,2s,and 3s)were ***/value–The proposed method is expected to serve as a reference for further studies on speedrelated acceleration limits in rail transit systems.

关键词： Car body acceleration Track status monitoring Speed-related acceleration limit Quantile regression Vehicle ride quality

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上海安亭新镇经验:规划结构中的文化和空间适应与转化

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China City Planning Review 2024年第1期33卷 22-33页

作者：哈利·邓·哈托格鲍莉珂梁毅方 TU delft the Netherlands Tongji University ShanghaiP.R.China 不详 Amsterdam University of Applied Sciences Amsterdamthe Netherlands

this paper we study planned and unplanned adjustment processes in master-planned communities and new towns by a first wave of residents,in which changes in lifestyles play a central *** can unplanned transitions be stimulated and play a role in making a new town more attractive,sustainable,adjustable,and fexible in use?We apply this to the case of Anting New Town in *** focus on both personal and collective adjustments and appropriation in housing,commercial,as well as public *** explore methods of doing visual research by observation,in line with methods by Venturi and *** adding economic and socio-cultural drivers and institutional frameworks,which allow these alterations to happen,conclusions are made about the possible sustainability,adjustability,and flexibility of these planned *** analyze adjustments from different perspectives on the themes of urbanity and identity:architectural-morphological,②functional-economical,and *** different approaches to studying the planned and unplanned city,we explain how the urbanity and identity of Anting have changed in various *** of building structures and urban spaces is a key element in this process of *** is the outcome of a wider process of economicand socio-culturalchange.

关键词： adaptability appropriation identity master-planned communities new towns open city personalization public space

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How aromatic dissolved organic matter differs in competitiveness against organic micropollutant adsorption

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Environmental Science and Ecotechnology 2024年第5期21卷 92-102页

作者： Qi Wang Oliver JLechtenfeld Luuk CRietveld Jonas Schuster Mathias Ernst Roberta Hofman-Caris Jan Kaesler Chunmiao Wang Min Yang Jianwei Yu Frederik Zietzschmann Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of Sciences100085BeijingChina delft University of Technology Department of Water ManagementPO Box 50482600GADelftthe Netherlands Department of Analytical Chemistry Research Group BioGeoOmicsHelmholtz Centre for Environmental ResearchUFZPermoserstr.1504318LeipzigGermany Berliner Wasserbetriebe LaboratoryMotardstr.3513629BerlinGermany Institute for Water Resources and Water Supply Hamburg University of TechnologyAm Schwarzenberg-Campus 321073HamburgGermany KWR Watercycle Research Institute 3433PENieuwegeinthe Netherlands ProVISCentre for Chemical Microscopy Helmholtz Centre for Environmental ResearchUFZPermoserstr.1504318LeipzigGermany Wageningen University and Research Department of Environmental TechnologyBornse Weilanden 96708 WGWageningenthe Netherlands University of Chinese Academy of Sciences 100049BeijingChina

Activated carbon is employed for the adsorption of organic micropollutants(OMPs)from water,typically present in concentrations ranging from ng L1 to mg L***,the efficacy of OMP removal is considerably deteriorated due to competitive adsorption from background dissolved organic matter(DOM),present at substantially higher concentrations in mg L*** the characteristics of competitive DOM is crucial in predicting OMP adsorption efficiencies across diverse natural *** weight(MW),aromaticity,and polarity influence DOM *** the aromaticity-related metrics,such as UV254,of low MW DOM were proposed to correlate with DOM competitiveness,the method suffers from limitations in understanding the interplay of polarity and aromaticity in determining DOM ***,we elucidate the intricate influence of aromaticity and polarity in low MW DOM competition,spanning from a fraction level to a compound level,by employing direct sample injection liquid chromatography coupled with ultrahigh-resolution Fouriertransform ion cyclotron resonance mass *** exchange resin pre-treatment eliminated 93%of UV254-active DOM,predominantly aromatic and polar DOM,and only minimally alleviated DOM *** characterization revealed that nonpolar molecular formulas(constituting 26%PAC-adsorbable DOM)with medium aromaticity contributed more to the DOM *** analysis indicated that the competitiveness of highly aromatic LMW DOM compounds was strongly counterbalanced by increased *** aromaticity-derived p-p interaction cannot facilitate the competitive adsorption of hydrophilic DOM *** results underscore the constraints of depending solely on aromaticity-based approaches as the exclusive interpretive measure for DOM *** a broader context,this study demonstrates an effect-oriented DOM analysis,elucidating counterbalancing interactions of DOM molecular properties

关键词： Activated carbon Organic micropollutants Dissolved organic matter(DOM) Multi-component adsorption Fourier-transform ion cyclotron resonance mass spectrometry(FT-ICR-MS)

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Extrusion-based additive manufacturing of Mg-Zn alloy scaffolds

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Journal of Magnesium and Alloys 2022年第9期10卷 2491-2509页

作者： J.Dong N.Tümer M.A.Leeflang P.Taheri L.E.Fratila-Apachitei J.M.C.Mol A.A.Zadpoor J.Zhou Department of Biomechanical Engineering Delft University of TechnologyDelft 2628 CDthe Netherlands Department of Materials Science and Engineering Delft University of TechnologyDelft 2628 CDthe Netherlands

Porous biodegradable Mg and its alloys are considered to have a great potential to serve as ideal bone *** recent progress in additive manufacturing(AM) has prompted its application to fabricate Mg scaffolds with geometrically ordered porous *** AM,followed by debinding and sintering,has been recently demonstrated as a powerful approach to fabricating such Mg scaffolds,which can avoid some crucial problems encountered when applying powder bed fusion AM ***,such pure Mg scaffolds exhibit a too high rate of in vitro *** the present research,alloying through a pre-alloyed Mg-Zn powder was ultilized to enhance the corrosion resistance and mechanical properties of AM geometrically ordered Mg-Zn scaffolds *** in vitro biodegradation behavior,mechanical properties,and electrochemical response of the fabricated Mg-Zn scaffolds were ***,the response of preosteoblasts to these scaffolds was systematically evaluated and compared with their response to pure Mg *** Mg-Zn scaffolds with a porosity of 50.3% and strut density of 93.1% were composed of the Mg matrix and MgZn2second phase *** in vitro biodegradation rate of the Mg-Zn scaffolds decreased by 81% at day 1,as compared to pure Mg *** 28 days of static immersion in modified simulated body fluid,the corrosion rate of the Mg-Zn scaffolds decreased from 2.3± 0.9 mm/y to 0.7±0.1 mm/*** yield strength and Young’s modulus of the Mg-Zn scaffolds were about 3 times as high as those of pure Mg scaffolds and remained within the range of those of trabecular bone throughout the biodegradation *** culture of MC3T3-E1 preosteoblasts in Mg-Zn extracts indicated favorable *** direct cell culture,some cells could spread and form filopodia on the surface of the Mg-Zn ***,this study demonstrates the great potential of the extrusion-based AM Mg-Zn scaffolds to be further develo

关键词： Additive manufacturing Material extrusion Magnesium-zinc alloy Porous scaffold Biodegradation

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Development of a hybrid particle-mesh method for simulating free-surface flows

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Journal of Hydrodynamics 2017年第3期29卷 413-422页

作者： Jakob Maljaars Robert Jan Labeur Matthias Moller Wim Uijttewaal Environmental Fluid Mechanics Section Faculty of Civil Engineering and GeosciencesDelft University of TechnologyDelftThe Netherlands Department of Applied Mathematics Delft University of TechnologyDelftThe Netherlands

In this work the feasibility of a numerical wave tank using a hybrid particle-mesh method is *** on the fluid implicit particle method（FLIP）a formulation for the hybrid method is presented for incompressible multiphase flows involving large density jumps and wave generating *** performance of the method is assessed for a standing wave and for the generation and propagation of a solitary wave over a flat and a sloping bed.A comparison is made with results obtained with a well-established SPH *** tests demonstrate that the method is a promising and attractive tool for simulating the nearshore propagation of waves.

关键词： Lagrangian-Eulerian particle-mesh free-surface flows numerical wave flume incompressible Navier-Stokes

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Single-photon avalanche diode imagers in biophotonics:review and outlook

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Light(Science & Applications) 2019年第1期8卷 409-436页

作者： Claudio Bruschini Harald Homulle Ivan Michel Antolovic Samuel Burri Edoardo Charbon AQUA EPFLNeuchatelSwitzerland AQUA TU DelftDelftThe Netherlands

Single-photon avalanche diode(SPAD)arrays are solid-state detectors that offer imaging capabilities at the level of individual photons,with unparalleled photon counting and time-resolved *** fascinating technology has progressed at a very fast pace in the past 15 years,since its inception in standard CMOS technology in 2003.A host of architectures have been investigated,ranging from simpler implementations,based solely on off-chip data processing,to progressively“smarter”sensors including on-chip,or even pixel level,time-stamping and processing *** the technology has matured,a range of biophotonics applications have been explored,including(endoscopic)FLIM,(multibeam multiphoton)FLIM-FRET,SPIM-FCS,super-resolution microscopy,time-resolved Raman spectroscopy,NIROT and *** will review some representative sensors and their corresponding applications,including the most relevant challenges faced by chip designers and ***,we will provide an outlook on the future of this fascinating technology.

关键词： image photon simpler

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Digital biofabrication to realize the potentials of plant roots for product design

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Bio-Design and Manufacturing 2021年第1期4卷 111-122页

作者： Jiwei Zhou Bahareh Barati Jun Wu Diana Scherer Elvin Karana Faculty of Industrial Design Engineering Delft University of TechnologyDelftThe Netherlands Amsterdam The Netherlands

Technological and economic opportunities,alongside the apparent ecological benefits,point to biodesign as a new industrial paradigm for the fabrication of products in the twenty-first *** presented work studies plant roots as a biodesign material in the fabrication of self-supported 3D structures,where the biologically and digitally designed materials provide each other with structural *** a material-driven design approach,we present our systematic tinkering activities with plant roots to better understand and anticipate their responsive *** helped us to identify the key design parameters and advance the unique potential of plant roots to bind discrete porous *** illustrate this binding potential of plant roots with a hybrid 3D object,for which plant roots connect 600 computationally designed,optimized,and fabricated bioplastic beads into a low stool.

关键词： Plant roots Biodesign Digital biofabrication Material-driven design Living organisms

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Design and Optimization of a GaN GIT Based PFC Boost Converter

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Chinese Journal of Electrical Engineering 2017年第3期3卷 34-43页

作者： Wenbo Wang Frans Pansier Jelena Popovic J.A.Ferreira delft University of Technology DelftThe Netherlands

The advent of GaN power devices brings the possibility of pushing up frequencies of power electronics system beyond the capacity of conventional Si *** harvest the high frequency operation benefits of GaN technology,not only GaN devices should be used optimally by providing proper switching and conduction conditions to best accommodate parasitic elements inherent with the devices,other components should also be capable of facilitating high frequency *** this paper,PFC boost converter is used as a platform to harvest the benefits of GaN technology and,at the same time,to uncover the limitations in pushing power electronics systems up.A 600W PFC boost converter with a maximum switching frequency of 3MHz is designed and implemented,which reached an average efficiency of 98.5%.The results indicate that,when properly used,a GaN PFC boost converter could operate at a frequency that is beyond the reach of conventional Si *** well,with availability of GaN devices,high frequency operation of power electronics systems is no longer limited by the lack of switching devices but by practical issues *** frequency magnetic materials,high frequency controllers,etc.

关键词： GaN GIT boost converter PFC high frequency design optimization

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Cooperative Multi-Agent Control for Autonomous Ship Towing Under Environmental Disturbances

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IEEE/CAA Journal of Automatica Sinica 2021年第8期8卷 1365-1379页

作者： Zhe Du Rudy R.Negenborn Vasso Reppa Department of Maritime and Transport Technology Delft University of Technology2628 CDDelftThe Netherlands

Among the promising application of autonomous surface vessels(ASVs)is the utilization of multiple autonomous tugs for manipulating a floating object such as an oil platform,a broken ship,or a ship in port *** the real conditions and operations of maritime practice,this paper proposes a multi-agent control algorithm to manipulate a ship to a desired position with a desired heading and velocity under the environmental *** control architecture consists of a supervisory controller in the higher layer and tug controllers in the lower *** supervisory controller allocates the towing forces and angles between the tugs and the ship by minimizing the error in the position and velocity of the *** weight coefficients in the cost function are designed to be adaptive to guarantee that the towing system functions well under environmental disturbances,and to enhance the efficiency of the towing *** tug controller provides the forces to tow the ship and tracks the reference trajectory that is computed online based on the towing angles calculated by the supervisory *** results show that the proposed algorithm can make the two autonomous tugs cooperatively tow a ship to a desired position with a desired heading and velocity under the(even harsh)environmental disturbances.

关键词： Cooperative control environmental disturbances multiple autonomous vessels robust control ship towing

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Metal-organic framework UiO-66 membranes

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Frontiers of Chemical Science and Engineering 2020年第2期14卷 216-232页

作者： Xinlei Liu Catalysis Engineering Department of Chemical EngineeringDelft University of Technology2629 HZ DelftThe Netherlands

Metal-organic frameworks(MOFs)have emerged as a class of promising membrane ***-66 is a prototypical and stable MOF material with a number of *** this article,we review five approaches for fabricating UiO-66 polycrystalline membranes including synthesis,secondary synthesis,biphase synthesis,gas-phase deposition and electrochemical deposition,as well as their applications in gas separation,pervaporation,nanofiltration and ion *** this basis,we propose possible methods for scalable synthesis of UiO-66 membranes and their potential separation applications in the future.

关键词： membrane metal-organic framework UiO-66 separation

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