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Ethernet based time synchronization for Raspberry Pi network improving network model verification for distributed active turbulent flow control

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Control Theory and Technology 2015年第2期13卷 204-210页

作者： marcel DUECK Mario SCHLOESSER Stefan van WAASEN Michael SCHIEK Central Institute of Engineering Electronics and Analytics ZEA-2: Electronic SystemsForschungszentrum Juelich Gmb H ZEA-2 Wilhelm-Johnen-Straβe University of Duisburg-Essen Faculty of Engineering

Friction drag primarily determines the total drag of transport systems. A promising approach to reduce drag at high Reynolds numbers(> 104) are active transversal surface waves in combination with passive methods like a riblet surface. For the application in transportation systems with large surfaces such as airplanes, ships or trains, a large scale distributed real-time actuator and sensor network is required. This network is responsible for providing connections between a global flow control and distributed actuators and sensors. For the development of this network we established at first a small scale network model based on Simulink and True Time. To determine timescales for network events on different package sizes we set up a Raspberry Pi based testbed as a physical representation of our first model. These timescales are reduced to time differences between the deterministic network events to verify the behavior of our model. Experimental results were improved by synchronizing the testbed with sufficient precision. With this approach we assure a link between the large scale model and the later constructed microcontroller based real-time actuator and sensor network for distributed active turbulent flow control.

关键词： Raspberry Pi True Time distributed actuator and sensor network network model

The olfactory system of Pieris brassicae caterpllars:from receptors to glomeruli

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Insect Science 2024年第2期31卷 469-488页

作者： Qi Wang Hans M.Smid marcel Dicke Alexander Haverkamp Laboratory of Entomology Wageningen University and ResearchWageningenthe Netherlands

Tolfactory system of adult lepidopterans is among the best described neuronal ***,comparatively little is known about the organization of the olfactory system in the larval stage of these ***,we explore the expression of olfactory receptors and the organization of olfactory sensory neurons in caterpillars of Pieris brassicae,a significant pest species in Europe and a well-studied species for its chemical *** describe the larval olfactory system in this species,we first analyzed the head transcriptome of third-instar larvae(L3)and identified 16 odorant receptors(ORs)including the OR coreceptor(Orco),13 ionotropic receptors(IRs),and 8 gustatory receptors(GRs).We then quantified the expression of these 16 ORs in different life stages,using qPCR,and found that the majority of ORs had significantly higher expression in the L4 stage than in the L3 and L5 stages,indicating that the larval olfactory system is not static throughout caterpillar *** an Orco-specific antibody,we identified all olfactory receptor neurons(ORNs)expressing the Orco protein in L3,L4,and L5 caterpillars and found a total of 34 Orco-positive ORNs,distributed among three sensilla on the *** number of Orco-positive ORNs did not differ among the three larval ***,we used retrograde axon tracing of the antennal nerve and identified a mean of 15 glomeruli in the larval antennal center(LAC),suggesting that the caterpillar olfactory system follows a similar design as the adult olfactory system,although with a lower numerical *** together,our results provide a detailed analysis of the larval olfactory neurons in P brassicae,highlighting both the differences as well as the commonalities with the adult olfactory *** findings contribute to a better understanding of the development of the olfactory system in insects and its life-stage-specific adaptations.

关键词： glomeruli larvae Lepidoptera odorant receptor olfactory receptor neurons sensilla

Organizing resilient infrastructure initiatives:A study on conceptualization,motivation,and operation of ten initiatives in the Netherlands

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Resilient Cities and Structures 2023年第3期2卷 120-128页

作者： Yirang Lim Johan Ninan Sibout Nooteboom marcel Hertogh Faculty of Civil Engineering and Geoscience Section Integral Design and ManagementDelft University of TechnologyDelftthe Netherlands Erasmus University Rotterdamthe Netherlands

Resilient infrastructure is critical to a sustainable and functioning *** management and(re)development are highly complex processes encompassing various stakeholders’interests while they are pres-sured by the uncertainty of climate change and social *** response to these challenges,various resilience initiatives emerged with different motivations and *** purpose of this research is to understand the interplay between motivations and organizational approaches as well as resilience *** can provide insights into which domains of resilience have been focused on and what needs to be improved in their or-ganizational approaches to realize *** research specifically investigates ten resilient infrastructure initiatives in the *** using scoping review and content analysis,our results highlight that resilience initiatives conceptualize resilience in different ways,mainly focusing on built and organizational resilience with a focus on long-term and wider geographic *** initiative had several motivations,including 1)creat-ing innovative solutions,2)sharing knowledge,3)promoting commitment and cooperation,and 4)promoting *** motivations are reflected in the organizational *** example,there was a strong link between the motivation‘creating shared knowledge’and the organizational approach‘research collaboration.’Generic motivation such as‘promoting resilience’does not have one mainstreaming approach,which shows promoting resilience in practice is still in the exploration *** research provides major motivations and organizational approaches and their link within the resilient infrastructure initiatives which can contribute to better organizing similar initiatives aiming for resilient infrastructure.

关键词： Sustainable and resilient infrastructure Initiative Netherlands Organization Qualitative

The increased severity of acute pancreatitis in the elderly is mainly related to intestinal barrier dysfunction

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Hepatobiliary & Pancreatic Diseases International 2018年第6期17卷 575-577页

作者： marcel Cerqueira Cesar Machado Heraldo Possolo Souza Emergency Department Faculdade de Medicina Universidade de Sao Paulo

To the Editor:Severeacutepancreatitisintheelderlyischaracterizedby significantmorbidityandmortalityrates,withahigherfinancial impact when compared to the same disease in younger patients [1]. There are some obvious di... 详细信息

关键词： elderly severity younger populations older permeability translocation interleukin mucosal inflammation

Choosing heat sinks for cooling in tropical climates

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Frontiers of Architectural Research 2013年第3期2卷 292-300页

作者： marcel Bruelisauer Forrest Meggers Hansjurg Leibundgut Future Cities Laboratory Singapore-ETH Centre Department of Architecture ETH ZLirich Switzerland School Of Design end Environment Notionul University of Sinsepore Singupore Chuir of Building Systems Institute of Technology in Architecture Department of ArchitectureETH Zurich Switzerlond

Efforts to limit CO2 emissions from buildings in the tropics either focus on reducing energy demand, i.e., air-conditioning, or on replacing fossil with renewable sources. The link between energy demand and supply is often overlooked, especially the effect of the temperature lift of air-conditioning systems on energy consumption. But while heat and humidity gains define energy demand, operating temperatures of the system define the necessary energy input. We aim to transfer our experience of usin~ the LowEx paradigm for heat pump systems in moderate climates to the tropical climate of Sinsapore. In this paper, we took a systematic overview of a range of heat sinks, to which we refer to as anergy sinks. We analysed their thermal properties and their effect on the performance of air-conditioning systems, expressed as COP. The predominantly used dry air-cooled condenser units performed worst, especially when subject to a stack effect in （semi-）confined spaces. The performance is highest for cooling towers using the wet bulb temperature followed by water body based anergy sinks and the soil. The wide spread of results confirms that the heat rejection temperature is a decisive factor for the performance of the overall cooting system and the input of primary energy.

关键词： Heat rejection Heat sink Energy efficiencyTropical climate Exergy Air-conditioning

Spatiotemporal distribution of seasonal bird assemblages on land-bridge islands: linking dynamic and static views of metacommunities

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Avian Research 2019年第3期10卷 250-261页

作者： Chuanwu Chen marcel Holyoak Yanping Wang Xingfeng Si Ping Ding College of Life Sciences Zhejiang University Hangzhou 310020China Jiangsu Key Laboratory for Biodiversity and Biotechnology College of Life SciencesNanjing Normal University Nanjing 210046China Department of Environmental Science and Policy University of CaliforniaDavisCA 95616USA School of Ecological and Environmental Sciences East China Normal UniversityShanghai 200241China

Background: Although assessing temporal dynamics of populations is crucial for understanding metacommunities, empirical studies have primarily analyzed only static snapshots of communities. Here, we present a holistic view of how species traits and habitat characteristics relate to metacommunity dynamics and use it to test for differences in the spatiotemporal distribution of seasonal bird assemblages. Methods: We surveyed forest birds in breeding and winter seasons within 36 islands for 9 years. We then grouped birds into four landbird assemblages, selected on the basis of published differences in biology or ecology: winter residents, migratory winter visitors, breeding summer residents, and migratory summer visitors. We estimated dynamic species colonization and extirpation through the 9-year period, and evaluated the associations among island attributes, species attributes and community composition. Results: Overall, winter and summer residents showed strong associations between composition and habitat structure of the islands. In addition, winter and summer residents on large islands had lower extirpation and turnover than winter and summer visitors. Visitor assemblages showed no significant habitat associations, and in winter had high extirpation rates and small body sizes. By contrast, local extirpation of summer visitors was correlated with local species richness, indicating a likely effect of competition on extirpation. Conclusions: Our results demonstrated repeated patterns among species composition, bird traits, habitat/island characteristics and observed metacommunity dynamics. Winter and summer residents best matched species sorting and patch dynamics, respectively, due to differences in resource availability and requirements of overwinter survival versus breeding. Summer visitors were consistent with species sorting and winter visitors were randomly distributed, likely because of interactions with resident competitors. Our results highlight that coexist

关键词： Body size Colonization Competition Extirpation Island turnover Metacommunity

Targeting of Vacuolar Membrane Localized Members of the TPK Channel Family

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Molecular Plant 2008年第6期1卷 938-949页

作者： marcel Dunkel Andreas Latz Karin Schumacher Thomas Muller Dirk Becker Rainer Hedrich Molecular Plant Physiology and Biophysics Julius-von-Sachs-lnstitute University of W0rzburg Julius-von-Sachs-Platz 2 97082 Worzburg Germany Heidelberger Institut fur Pflanzenwissenschaften (HIP) University of Heidelberg Im Neuenheimer Feld 230 69120 Heidelberg Germany (K.S.) Present address: Physiological Ecology of Plants University ot T(3bingen Aut der Morgenstelle 1 72016 Tubingen Germany

Four members of the tandem-pore potassium channel family of Arabidopsis thaliana （TPK1, 2, 3, and 5） reside in the vacuolar membrane, whereas TPK4 is a plasma membrane K^＋-channel. By constructing chimeras between TPK1 and TPK4, we attempted to identify channel domains involved in the trafficking process and found that the TPK1 cytoplasmic C-terminal domain （CT） is critical for the ERas well as Golgi-sorting steps. Following site-directed mutagenesis, we identified a diacidic motif （DLE） required for ER-export of TPK1. However, this diacidic motif in the C-terminus is not conserved among other members of the TPK family, and TPK3 sorting is independent of its CT. Moreover, the 14-3-3 binding site of TPK1, essential for channel activation, is not involved in channel sorting.

关键词： Vacuolar Membrane TPK Channel Family Arabidopsis thaliana

Palatability and profitability of co-occurring seeds alter indirect interactions among rodent-dispersed trees

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Integrative Zoology 2022年第2期17卷 206-216页

作者： Zhishu XIAO marcel HOLYOAK Charles J.KREBS Xiaoqun HUANG State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture Institute of ZoologyChinese Academy of SciencesChina University of Chinese Academy of Sciences BeijingChina Department of Environmental Science and Policy University of CaliforniaDavisUSA Department of Zoology University of British ColumbiaVancouverCanada

Beyond direct species interactions,seed dispersal is potentially affected by indirect seed–seed interactions among co-occurring nut-bearing trees which are mediated by scatter-hoarding animals as shared seed dispersers.A relevant question in such systems is to what extent different functional traits related to food palatability and profitability affect the kinds of indirect interactions that occur among co-occurring seeds,and the consequences for seed *** used field experiments to track seed dispersal with individually tagged seeds in both monospecific and mixed seed *** measured indirect effects based on 3 seed–seed species pairs from the family Fagaceae with contrasting seed size,tannin level,and dormancy in a subtropical forest in Southwest *** all else was equal,the presence of adjacently placed seeds with contrasting seed traits created different indirect effects measured through a variety of dispersal-related *** mutualism was reciprocal due to increasing seed dispersal in mixed seed patches with mixed differences in seed tannins and ***,differences in either seed size or dormancy in co-occurring adjacently placed seeds caused apparent competition with reduced seed removal or seed dispersal(distance)in at least one *** study supports the hypothesis that different functional traits related to food palatability and profitability in co-occurring seeds modify foraging decisions of scatter-hoarding animals,and subsequently cause indirect effects on seed dispersal among rodent-dispersed *** conclude that such indirect effects mediated by shared seed dispersers may act as an important determinant of seed dispersal for co-fruiting animal-dispersed trees in many natural forests.

关键词： dispersal distance functional trait scatter-hoarding rodents seed dispersal trait-mediated indirect interactions

Enzymatic co-crosslinking of star-shaped poly(ethylene glycol)tyramine and hyaluronic acid tyramine conjugates provides elastic biocompatible and biodegradable hydrogels

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Bioactive Materials 2023年第2期20卷 53-63页

作者： Rong Wang Xiaobin Huang Bram Zoetebier Pieter JDijkstra marcel Karperien Department of Developmental BioEngineering Faculty of Science and TechnologyTech Med CentreUniversity of TwenteP.O.Box 2177500 AEEnschedethe Netherlands Radboudumc Dept.of Dentistry-Regenerative BiomaterialsRadboud University Medical CenterPhilips van Leydenlaan 256525 EX NijmegenThe Netherlands Department of Oral and Maxillofacial Surgery School of Dental MedicineUniversity of Pennsylvania240 South 40th StreetPhiladelphiaPA 19104-6030US

A combination of the viscoelastic properties of hyaluronic acid(HA)and the elastic properties of star shaped 8-arm poly(ethylene glycol)(8-arm PEG)was used to design in-situ forming *** were prepared by the enzymatic crosslinking of a partially tyramine modified 8-arm PEG and a tyramine conjugated HA using horseradish peroxidase in the presence of hydrogen *** of the homopolymer conjugates and mixtures thereof were rapidly formed within seconds under physiological conditions at low polymer and enzyme *** hydrogels with high gel content(≥95%)and high storage moduli(up to 22.4 kPa)were *** in vitro study in the presence of hyaluronidase(100 U/mL)revealed that with increasing PEG content the degradation time of the hybrid hydrogels increased up to several weeks,whereas hydrogels composed of only hyaluronic acid degraded within 2 *** mesenchymal stem cells(hMSCs)incorporated in the hybrid hydrogels remained viable as shown by a PrestoBlue and a live-dead assay,confirming the biocompatibility of the *** production of an extracellular matrix by re-differentiation of encapsulated human chondrocytes was followed over a period of 28 *** expression indicated that these highly elastic hydrogels induced an enhanced production of collagen type *** low PEG-TA/HA-TA ratios a higher expression of SOX 9 and ACAN was *** results indicate that by modulating the ratio of PEG/HA,injectable hydrogels can be prepared applicable as scaffolds for tissue regeneration applications.

关键词： PEG-OH8 HA Enzymatic crosslinking hydrogel Degradation Proliferation&differentiation