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Optimal Component Types for the Design of Construction Processes

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Tsinghua Science and Technology 2008年第S1期13卷 317-324页

作者： felix Enge Wolfgang Huhnt Chair of Process Modelling in Civil Engineering Berlin Institute of Technology

Within the project preparation phase, experienced professionals manually map design information onto process information with the aim to develop realistic and practical schedules. Unfortunately, the mapping itself is neither part of any underlying data model nor is it supported by current scheduling tools. As a consequence the process of setting up the data model for a schedule is still not supported formally. Huhnt and Enge described a modelling technique that addresses the missing linkage between design and process information[1]. The approach makes use of so called component types. These are template sub-processes that describe the fabrication procedure of typical building components. Decomposing the building into com-ponents and assigning a component type to each component allows for formal support while scheduling. Depending on the decomposition of the building into components and the complexity of the involved component types the specification effort differs. The question about optimal component types arises: Which layout of building components and component types results in minimal specification effort? This paper presents a branch and bound algorithm to determine optimal component types. For a given schedule, which has been modelled based on component types, all possible decompositions into sub-processes are determined. During the decomposition process the encountered configurations are compared. Those with minimal specifica-tion effort are registered. Theoretical and practical examples are examined and discussed.

关键词： scheduling process modelling planning processes construction processes branch and bound pattern matching search algorithm optimization

Less workplace parking with fully autonomous vehicles?

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Journal of Intelligent and Connected Vehicles 2022年第3期5卷 283-301页

作者： Stefan Tscharaktschiew felix Reimann Institute of Transport and Economics Technische Universität DresdenDresdenGermany

Purpose–Recent studies on commuter parking in an age of fully autonomous vehicles(FAVs)suggest,that the number of parking spaces close to the workplace demanded by commuters will decline because of the capability of FAVs to return home,to seek out(free)parking elsewhere or just *** would be good news because,as of today,parking is one of the largest consumers of urban land and is associated with substantial costs to *** of the studies,however,is concerned with the special case of employer-provided parking,although workplace parking is a widespread phenomenon and,in many instances,the dominant form of commuter *** purpose of this paper is to analyze whether commuter parking will decline with the advent of self-driving cars when parking is provided by the ***/methodology/approach–This study looks at commuter parking from the perspective of both the employer and the employee because in the case of employer-provided parking,the firm’s decision to offer a parking space and the incentive of employees to accept that offer are closely interrelated because of the fringe benefit character of workplace *** study develops an economic equilibrium model that explicitly maps the employer–employee relationship,considering the treatment of parking provision and parking policy in the income tax code and accounting for adverse effects from commuting,parking and public *** study determines the market level of employer-provided parking in the absence and presence of FAVs and identifies the factors that drive the *** study then approximates the magnitude of each factor,relying on recent(first)empirical evidence on the impacts of ***–This paper’s analysis suggests that as long as distortive(tax)policy favors employer-provided parking,FAVs are no guarantee to end up with less commuter ***/value–This study’s findings imply that in a world of self-driving cars,policy intervention related to work comm

关键词： Autonomous vehicles Employer-provided parking Fringe benefit Self-driving cars Transport policy

Comparison of manual and automatic barcode detection in rough horticultural production systems

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International Journal of Agricultural and Biological Engineering 2019年第6期12卷 169-176页

作者： felix Eyahanyo Thomas Rath Leibniz University of Hannover Institute of Horticultural Production SystemsBiosystems Engineering SectionHerrenhäuser Straße 230419 HannoverGermany University of Applied Sciences Osnabrück Biosystems Engineering Laboratory(BLab)Oldenburger Landstraße 2449090 OsnabrückGermany

Automation of production in the nurseries of flower producing companies using barcode scanners have been attempted but with little *** laser barcode scanners which have been used for automation have failed due to the close proximity between the barcode and the scanner,and factors such as speed,angle of inclination of the barcode,damage to the barcode and dirt on the ***,laser barcode scanners are still being used manually in the nurseries making work laborious and time consuming,which leading to reduced ***,an automated image-based barcode detection system to help solve the aforementioned problems was *** were conducted under different situations with clean and artificially soiled Code 128 barcodes in both the laboratory and under real production conditions in a flower producing *** images were analyzed with a specific algorithm developed with the software tool *** the results from the company showed that the image-based system has a future prospect for automation in the nursery.

关键词： automation barcode detection horticultural production systems image processing barcode scanners

Statistics for Surface Modes of Nanoparticles with Shape Fluctuations

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Communications in Computational Physics 2010年第10期8卷 1224-1241页

作者： felix Ruting Hannes Uecker Institut fur Physik Carl von Ossietzky UniversitatOldenburg D-26111Germany Institut fur Mathematik Carl von Ossietzky UniversitatOldenburg D-26111Germany

We develop a numerical method for approximating the surface modes of sphere-like nanoparticles in the quasi-static limit,based on an expansion of(the angular part of)the potentials into spherical *** of the results obtained in this manner with exact solutions and with a perturbation ansatz prove that the scheme is accurate if the shape deviations from a sphere are not too *** method allows fast calculations for large numbers of particles,and thus to obtain statistics for nanoparticles with random shape *** an application we present some statistics for the distribution of resonances,polariziabilities,and dipole axes for particles with random perturbations.

关键词： Electrostatic(boundary-value problems) collective excitations(plasmons) shape fluctuations numerical scheme spherical harmonics projection method

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《小鹿斑比》(节选)

疯狂英语（新读写） 2024年第8期 55-57,78页

作者：费利克斯·萨尔腾不详

Deep in among the trees was a place that belonged to Bambi's *** lay only a few steps from the narrow path used by the deer as they made their way through the wood but it was nearly impossible to find for anyone who d... 详细信息

关键词： mother narrow steps

A four-month cycle in COVID-19 cases in Switzerland

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The Innovation 2022年第3期3卷 7-8页

作者： felix Scholkmann University Hospital Zurich University of Zurich8091 ZurichSwitzerland

The coronavirus disease 2019(COVID-19)pandemic,caused by the transmission of the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),shows a complex epidemiological course characterized by several successive waves of infectionwith a certain strength,duration,and ***,Mitchell and Zhang reported in a publication in this journal1 their intriguing finding of a“four-month intrinsic viral cycle in COVID-19”by analyzing the dynamics of COVID-19 cases for 14 countries separately and for a global dataset including 189 *** time span analyzed was about 1.8 years(January 22,2020,to October 8,2021).

关键词： cases acute respiratory

Multi-material additive manufacturing-functionally graded materials by means of laser remelting during laser powder bed fusion

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Frontiers of Mechanical Engineering 2023年第4期18卷 183-193页

作者： Alexander SCHMIDT felix JENSCH Sebastian HÄRTEL Chair of Hybrid Manufacturing Brandenburg University of TechnologyCottbus 03046Germany

Many processes may be used for manufacturing functionally graded *** them,additive manufacturing seems to be predestined due to near-net shape manufacturing of complex geometries combined with the possibility of applying different materials in one *** adjusting the powder composition of the starting material layer by layer,a macroscopic and step-like gradient can be *** further improve the step-like gradient,an enhancement of the in-situ mixing degree,which is limited according to the state of the art,is *** this paper,a novel technique for an enhancement of the in-situ material mixing degree in the melt pool by applying laser remelting(LR)is *** effect of layer-wise LR on the formation of the interface was investigated using pure copper and low-alloy steel in a laser powder bed fusion *** cross-sectional selective electron microscopic analyses were carried *** applying LR,the mixing degree was enhanced,and the reaction zone thickness between the materials was ***,an additional copper and iron-based phase was formed in the interface,resulting in a smoother gradient of the chemical composition than the case without *** Marangoni convection flow and thermal diffusion are the driving forces for the observed effect.

关键词： multi-material additive manufacturing(MMAM) functionally graded materials(FGMs) laser powder bed fusion(L-PBF) laser remelting(LR) pure copper

Imaging in translational cancer research

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Cancer Biology & Medicine 2022年第11期19卷 1565-1585页

作者： felix T.kurz Heinz-Peter Schlemmer Department of Radiology German Cancer Research CenterHeidelberg 69120Germany

This review is aimed at presenting some of the recent developments in translational cancer imaging research,with a focus on novel,recently established,or soon to be established cross-sectional imaging techniques for computed tomography(CT),magnetic resonance imaging(MRI),and positron-emission tomography(PET)imaging,including computational investigations based on machine-learning techniques.

关键词： Cancer imaging computed tomography(CT) magnetic resonance imaging(MRI) positron emission tomography(PET) cross-sectional imaging

Influence of Yttrium Ion-Implantation on the Growth kinetics and Micro-Structure of NiO Oxide Film

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Plasma Science and Technology 2008年第1期10卷 43-45页

作者：靳惠明 Adriana felix Majorri AROYAVE College of Mechanical Engineering Yangzhou University Yangzhou 225009 China College of Materials Engineering National University of Antiuquia Medellin 23715 Colombia

Isothermal and cyclic oxidation behaviours of pure and yttrium-implanted nickel were studied at 1000℃ in air. Scanning electronic microscopy （SEM） and transmission electronic microscopy （TEM） were used to examine the micro-morphology and structure of oxide scales formed on the nickel substrate. It was found that Y-implantation significantly improved the anti- oxidation ability of nickel in both isothermal and cyclic oxidizing experiments. Laser Raman microscopy was also used to study the stress status of oxide scales formed on nickel with and without yttrium. The main reason for the improvement in anti-oxidation of nickel was that Y- implantation greatly reduced the growing speed and grain size of NiO. This fine-grained NiO oxide film might have better high temperature plasticity and could relieve parts of compressive stress by means of creeping, and maintained a ridge character and a relatively low internal stress level. Hence yttrium ion-implantation remarkably enhanced the adhesion of protective NiO oxide scale formed on the nickel substrate.

关键词： ion-implantation laser Raman stress oxide yttrium