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Particuology 2024年第7期90卷 364-382页

作者： Barış Gürel Gülşah Karaca Dolgun Osman İpek Ali Keçebaş Department of Mechanical Engineering Engineering FacultySüleyman Demirel UniversityÇünürIspartaTurkey Department of Energy Systems Engineering Technology FacultyMuğla SıtkıKoçman UniversityKötekliMenteşeMuğlaTurkey

This study delves into the combustion behavior of various lignite types within a circulating fluidized bed boiler(CFBB),with a primary focus on the impact of different bed material sphericity ratios(0.5,0.7,and 0.9).Utilizing bed material with a sphericity ratio of 0.9 sourced from theÇan power plant and verified through experimentation,the research reveals several key ***,furnace temperatures tended to rise with higher sphericity ratios,albeit with variations between lignite types,particularly highlighting the complexity of this relationship in the case of GLI-Tunçbilek *** levels in the combustion chamber remained consistent across different sphericity ratios,indicating minimal influence on pressure *** combustion efficiency,especially at the bottom of the boiler,was observed at lower sphericity levels(0.5 and 0.7)forÇan lignite,as reflected in CO_(2) mole *** NO_(x) emissions generally decreased with lower sphericity,the sensitivity to sphericity varied by lignite type,with Ilgın lignite showcasing low NO_(x) but high SO_(2) emissions,underscoring the intricate interplay between lignite properties,sphericity,and ***,this study advances our understanding of CFBB combustion dynamics,offering insights valuable for optimizing performance and emissions control,particularly in lignite-based power.

关键词： Circulating fluidized bed boiler Computational particle fluid dynamics method Particle sphericity ratios NO_(x)and SO_(2)emissions Energy production efficiency

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智能材料助力实现微纳尺度操控

Science Bulletin 2024年第6期69卷 718-721页

作者：张明超 Metin Sitti Physical Intelligence Department Max Planck Institute for Intelligent SystemsStuttgart 70569Germany Institute for Biomedical Engineering ETH ZürichZürich 8092Switzerland School of Medicine and College of Engineering KoçUniversityIstanbul 34450Turkey

At the macroscopic world,we often take the manipulation of objects in our environment for ***,at the micro/nanoscale,the precise and controlled alteration,handling,or actuation(i.e.,manipulation)of materials and structures are highly challenging and different due to the scaling effects and increased complexity of dominant interaction forces at these length scales[1],requiring new materials and methods.

关键词：智能材料微纳尺度 precise

The neglect of nonnative orthopterans as potential invaders:A call for awareness

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Insect Science 2024年第4期31卷 994-1000页

作者： Anna K.Kulessa Paride Balzani Ismael Soto Antonín kouba David Renault Ali Serhan Tarkan Phillip J.Haubrock Ruhr university Bochum Faculty of Biology and BiotechnologyBochumGermany Faculty of Biology University of Duisburg-EssenUniversitätsstraße 5EssenGermany Faculty of Fisheries and Protection of Waters South Bohemian Research Center of Aquaculture and Biodiversity of HydrocenosesUniversity of South Bohemia in CˇeskéBudeˇjoviceVodnˇanyCzech Republic university of Rennes CNRSECOBIO(EcosystèmesBiodiversitéEvolution)UMRRennesFrance Faculty of Fisheries Department of Basic SciencesMu˘gla SıtkıKoçman UniversityMu˘glaTurkey Department of Life and Environmental Sciences Bournemouth UniversityPooleDorsetUK Faculty of Biology and Environmental Protection Department of Ecology and Vertebrate ZoologyUniversity ofŁodzŁodzPoland Department of River Ecology and Conservation Senckenberg Research Institute and Natural History Museum FrankfurtGelnhausenGermany Center for Applied Mathematics and Bioinformatics Gulf University for Science and TechnologyMubarak Al-AbdullahKuwait

Despite the potential ecological and economic impacts of invasive species,there is a dearth of data on the presence,impacts,and management implications of potentially invasive Orthoptera *** lack of research and inconsistent data,including risk screenings and impact assessments,is especially evident in ***,assessing the status,distribution,and potential threats of nonnative Orthoptera in Europe remains challenging,impeding the development of effective management *** address this gap,we call for increased efforts to collect and curate data on non-native and possibly invasive Orthoptera in *** efforts will improve our understanding of this order’s invasion dynamics,facilitate the identification of priority areas for conservation,and support the development of effective management policies and preventive measures.

关键词： costs cricket damages grasshopper impact research

Exciton recycling via InP quantum dot funnels for luminescent solar concentrators

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Nano Research 2021年第5期14卷 1488-1494页

作者： Houman Bahmani Jalali Sadra Sadeghi Isinsu Baylam Mertcan Han Cleva W.Ow-Yang Alphan Sennaroglu Sedat Nizamoglu Graduate School of Biomedical Sciences and Engineering KoçUniversityIstanbul34450Turkey Graduate School of Material Science and Engineering KoçUniversityIstanbul34450Turkey koçuniversity Surface Science and Technology Center(KUYTAM) KoçUniversityIstanbul34450Turkey Laser Research Laboratory KoçUniversityIstanbul34450Turkey Department of Electrical and Electronics Engineering KoçUniversityIstanbul34450Turkey Department of Material Science and Nano Engineering Sabanci UniversityIstanbul34956Turkey

Luminescent solar concentrators (LSC) absorb large-area solar radiation and guide down-converted emission to solar cells for electricity production. Quantum dots (QDs) have been widely engineered at device and quantum dot levels for LSCs. Here, we demonstrate cascaded energy transfer and exciton recycling at nanoassembly level for LSCs. The graded structure composed of different sized toxic-heavy-metal-free InP/ZnS core/shell QDs incorporated on copper doped InP QDs, facilitating exciton routing toward narrow band gap QDs at a high nonradiative energy transfer efficiency of 66%. At the final stage of non-radiative energy transfer, the photogenerated holes make ultrafast electronic transitions to copper-induced mid-gap states for radiative recombination in the near-infrared. The exciton recycling facilitates a photoluminescence quantum yield increase of 34% and 61% in comparison with semi-graded and ungraded energy profiles, respectively. Thanks to the suppressed reabsorption and enhanced photoluminescence quantum yield, the graded LSC achieved an optical quantum efficiency of 22.2%. Hence, engineering at nanoassembly level combined with nonradiative energy transfer and exciton funneling offer promise for efficient solar energy harvesting.

关键词： energy transfer indium phosphide quantum dot light harvesting luminescent solar concentrator luminescent solar concentrators(LSC)

A Novel Disturbance Observer Based Fixed-Time Sliding Mode Control for Robotic Manipulators With Global Fast Convergence

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IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 661-672页

作者： Dan Zhang Jiabin Hu Jun Cheng Zheng-Guang Wu Huaicheng Yan IEEE Zhejiang university of Technology Guangxi Normal university Zhejiang university the East China university of Science and Technology

This paper proposes a new global fixed-time sliding mode control strategy for the trajectory tracking control of uncertain robotic ***,a fixed-time disturbance observer(FTDO) is designed to deal with the adverse effects of model uncertainties and external disturbances in the manipulator *** an adaptive scheme is used and the adaptive FTDO(AFTDO) is developed,so that the priori knowledge of the lumped disturbance is not ***,a new non-singular fast terminal sliding mode(NFTSM) surface is designed by using an arctan function,which helps to overcome the singularity problem and enhance the robustness of the *** on the estimation of the lumped disturbance by the AFTDO,a fixed-time non-singular fast terminal sliding mode controller(FTNFTSMC)is developed to guarantee the trajectory tracking errors converge to zero within a fixed *** settling time is independent of the initial state of the *** addition,the stability of the AFTDO and FTNFTSMC is strictly proved by using Lyapunov ***,the fixed-time NFESM(FTNFTSM) algorithm is validated on a 2-link manipulator and comparisons with other existing sliding mode controllers(SMCs) are *** comparative results confirm that the FTNFTSMC has superior control performance.

关键词： Disturbance observer(DO) fixed-time non-singular sliding mode control robotic manipulator trajectory tracking

Iterative signal reconstruction of deliberately clipped SMT signals

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Science China(Information Sciences) 2014年第2期57卷 5-17页

作者： koLLR Zsolt GAZDA Juraj HORVTH Pter VARGA Lajos koCUR Duan Budapest university of Technology and Economics Technical university of koice

Staggered MultiTone(SMT)is a modulation technique showing significantly reduced Adjacent Channel Leakage Ratio(ACLR)resulting in a more compact Power Spectrum Density(PSD)for the transmitted signal,than the well-known and already widely adopted Orthogonal Frequency Division Multiple Access(OFDMA)***,the unique spectral properties of an SMT signal could be degraded by a non-linear element(e.g.a Power Amplifier(PA))in the *** baseband clipping can be applied to the transmitted signal,reducing the notable high Peak-to-Average Power Ratio(PAPR).The objective of this paper is to give a brief introduction to the SMT scheme,with a special emphasis on deliberate clipping efects and their *** paper introduces two receiver-oriented iterative methods aiming at the restoration of the baseband Bit Error Rate(BER)performance of a non-clipped *** methods are evaluated and compared based on numerical *** paper concludes with the selection of a possible candidate for use in systems applying deliberately clipped SMT signals.

关键词： clipping SMT iterative decoding nonlinear distortion PAPR

Interactive transport of multi-view videos for 3DTV applications

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Journal of Zhejiang university-Science A(Applied Physics & Engineering) 2006年第5期7卷 830-836页

作者： KURUTEPE Engin CIVANLAR M.Reha TEKALP A.Murat School of Engineering ko university Istanbul 34450 Turkey

The authors propose a novel method for transporting multi-view videos that aims to keep the bandwidth requirements on both end-users and servers as low as possible. The method is based on application layer multicast, where each end point re- ceives only a selected number of views required for rendering video from its current viewpoint at any given time. The set of selected videos changes in real time as the user’s viewpoint changes because of head or eye movements. Techniques for reducing the black-outs during fast viewpoint changes were investigated. The performance of the approach was studied through network experiments.

关键词： 3DTV, Multi-view video, Application-layer multicast, Join-latency

Synthetic brochosomes:Design,synthesis,and applications

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Nano Research 2024年第2期17卷 734-742页

作者： Lin Wang Jinsol Choi Tak-Sing Wong Department of Mechanical Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA Materials Research Institute The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Biomedical Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA

Brochosomes,which are nanoscopic buckyball-shaped granules produced by leafhoppers,are one of the most intricate structures discovered in *** functions of brochosomes have been proposed but only a few have been experimentally validated due to the challenge of fabricating their synthetic *** in micro-and nanofabrication have recently led to the emergence of synthetic brochosomes,opening up new possibilities for innovative *** review explores the early discovery of natural brochosomes and their geometrical features,followed by the recent progress in fabricating synthetic brochosomes and their *** on future applications and challenges in the scalable manufacturing of synthetic brochosomes are discussed.

关键词： synthetic brochosomes leafhopper antireflection superhydrophobicity surface-enhanced Raman scattering photocatalyst energy harvesting

Preparation and Compaction Behaviour of Poly(methyl methacrylate) Coated Iron Microparticles

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Journal of Materials Science & Technology 2010年第5期26卷 454-460页

作者： Daniela Kladeková Renáta Orináková Annamária Krajníková Miriam Kupková Margita Kabátová Kveta Markuová Institute of Chemistry Faculty of ScienceP.J.afárik University in Koice Institute of Materials Research of the Slovak Academy of Sciences in koice

The poly（methyl methacrylate）（PMMA） coatings onto surface of iron particles were electrochemically prepared and the effect on both surface structure and internal structure of the resulted material after compaction was carried *** electrochemical polymerization treatment was performed in a fluidized bed electrolyzer using sulphuric acid solution containing potassium persulphate and methyl methacrylate（MMA）.The surface topography and the microstructure of the samples were observed by scanning electron microscopy（SEM） and optical microscopy（OM）.It was found that the PMMA layer coated onto iron particles results in improvement of their compressibility compared with uncoated powders,and classical lubricants are not necessary for compacting particles coated.

关键词： Cathodic electropolymerization Poly(methyl methacrylate) coating Surface appearance Microstructure Compaction process

Analysis of synthetic parameters for coating aluminum powders with phenyltriethoxysilane coupling agent and their effects on powder flow behavior

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Particuology 2024年第7期90卷 412-417页

作者： Lillian M.Mawby Bellamarie Ludwig Benjamin J.Lear Department of Chemistry The Pennsylvania State UniversityUniversity ParkPA16802USA Applied Research Laboratory The Pennsylvania State UniversityUniversity ParkPA16802USA

Though silanization of aluminum powder is currently used to improve its flow properties,for use as an alternative fuel source,there are a wide range of experimental parameters for the process and not all of them have been thoroughly *** this is complete,it is unknown if the process is optimized in terms of time,efficiency,and ***,we report on a study into the effects of changes in humidity,degree of agitation,reaction temperature,and curing time upon the deposition of phenyl triethoxysilane into 20μm(d50)aluminum *** confirm the deposition of the coating via diffuse reflectance infrared spectroscopy and x-ray photoelectron *** then characterize the coated particles using apparent density measurements and Carney flow *** analysis of variance,we find that,of the parameters explored,only changes in cure time and reaction temperature provide meaningful changes to the apparent density,while none of our parameters produced statistically significant changes in Carney flow ***,we conclude that,when optimizing silanization of aluminum particles,environmental control of humidity is unneeded and that the reaction can be run with minimal *** ability to largely ignore these parameters is a benefit to large-scale processing.

关键词： Aluminum powder Silane Fluidization Apparent density Carney flow