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Multi-Step Clustering of Smart Meters Time Series:Applica.ion to Demand Flexibility Characteriza.ion of SME Customers

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 869-907页

作者： Santiago bañales Raquel Dormido Na.ividad Duro Department of Computer Sciences and Automa.ic Control Universidad Nacional de Educación a Distancia(UNED)Madrid28040Spain iberdrola.innova.ion Middle East Doha210177Qatar

Customer segmenta.ion according to load-shape profiles using smart meter data.is an increa.ingly important applica.ion to vital the planning and opera.ion of energy systems and to enable citizens’participa.ion in the energy *** study proposes an innova.ive multi-step clustering procedure to segment customers based on load-shape patterns at the daily and intra-daily time *** meter data.is split between daily and hourly norma.ized time series to assess monthly,weekly,daily,and hourly seasona.ity patterns *** dimensiona.ity reduction implicit in the splitting allows a direct approach to clustering raw daily energy time series *** intraday clustering procedure sequentially identifies representa.ive hourly day-unit profiles for each customer and the entire *** the first time,a step function approach is applied to reduce time series *** attributes embedded in surveys are employed to build external clustering va.ida.ion metrics using Cramer’s V correla.ion factors and to identify sta.istically significant determinants of load-shape in energy *** addition,a time series features engineering approach is used to extract 16 relevant demand flexibility indicators that characterize customers and corresponding clusters along four different axes:available Energy(E),Temporal patterns(T),Consistency(C),and Va.ia.ility(V).The methodology is implemented on a real-world electricity consumption dataset of 325 Small and Medium-sized Enterprise(SME)customers,identifying 4 daily and 6 hourly easy-to-interpret,well-defined *** applica.ion of the methodology includes selecting key parameters via grid search and a thorough compa.ison of clustering distances and methods to ensure the robustness of the *** research can test the scala.ility of the methodology to larger datasets from va.ious customer segments(households and large commercial)and loca.ions with different weather and socioeconomic conditio

关键词： Electric load clustering load profiling smart meters machine learning data mining demand flexibility demand response

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Characteriza.ion of a.ithmetic Functions that Preserve the Sum-of-squares Opera.ion

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Acta Mathema.ica Sinica,English Series 2014年第4期30卷 689-695页

作者： Bojan Ba.i Department of Mathema.ics and informa.ics University of Novi Sad

We characterize all functions f ： N → C such that f（m^2 ＋ n^2） = f（m）^2 ＋ f（n）^2 for all m, n ∈ N. it turns out that all such functions can be grouped into three fa.ilies, namely f ≡ 0, f（n） = ±n （subject to some restrictions on when the choice of the sign is possible） and f（n） =±l/2（again subject to some restrictions on when the choice of the sign is possible）.

关键词： a.ithmetic function functional equa.ion sum of squares

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Arctic sea.ice extent: No record minimum in 2023 or recent years

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Atmospheric and Ocea.ic Science Letters 2025年第1期18卷 52-55页

作者： Ola M.Johannessen Tor i.Olaussen Nansen Scientific Society BergenNorway Nansen Environmental and Remote Sensing Center BergenNorway

Arctic sea.ice extent reaches its minimum each year in September. On 11 September 2023 the minimum was 4.969 million square kilometers(***^(2)). This was not a record low, which occurred in 2012, when the minimum was 4.175 ***^(2), 0.794 ***^(2) less than the minimum in 2023. However, the ice extent had decreased by 0.432 ***^(2) compared with 2022. Nevertheless, the summer melting in 2023 was remarkably less than expected when considering the strong heat waves in the atmosphere and ocean, with record temperatures set around the world. in general, there is a high correla.ion between the long-term decrease in sea.ice extent and the increa.ing CO_(2) in the atmosphere, where the increase of CO_(2) in recent decades explains about 80% of the decrease in sea.ice in September, while the remainder is caused by natural va.ia.ility.

关键词： Sea.ice Arctic Minimum ice Climate

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Biomedical applica.ions of mRNA nanomedicine

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Nano Research 2018年第10期11卷 5281-5309页

作者： Qingqing Xiong gha Young Lee Jianxun Ding Wenliang Li Jinjun Shi Center for Nanomedicine and Department of Anesthesiology Brigham and Women's Hospital Harvard Medical School Boston MA 02115 USA Department of Hepatobiliary Cancer Tianjin Medical University Cancer Institute & Hospital Tianjin 300060 China School of Pharmacy Jilin Medical University Jilin 132013 China

As an attractive alterna.ive to plasmid DNA, messenger RNA （mRNA） has recently emerged as a promising class of nucleic a.id therapeutics for biomedical applica.ions. Advances in addressing the inherent shortcomings of mRNA and in the development of nanoparticle-based delivery systems have prompted the development and clinical transla.ion of mRNA-based medicines. in this review, we discuss the chemical modifica.ion strategies of mRNA to improve its sta.ility, minimize immune responses, and enhance transla.ional efficacy. We also highlight recent progress in nanoparticle-based mRNA delivery. Considerable attention is given to the increa.ingly widespread applica.ions of mRNA nanomedicine in the biomedical fields of vaccina.ion, protein-replacement therapy, gene editing, and cellular reprogramming and engineering.

关键词： messenger RNA chemical modifica.ion nanoparticle vaccina.ion gene editing protein-replacement cellular reprogramming and engineering

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马来人及其宗教

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东南亚研究 2013年第5期 106-112页

作者：马强张梓轩 za'ba 陕西师范大学西北民族研究中心西安710062 不详

著名马来人学者扎巴在20世纪30年代对马来人习俗及宗教的讨论,涉及马来人信仰伊斯兰教的历史、马来人中的印度教和万物有灵论成分、伊斯兰现代思潮、宗教派别及其观点、马来人的现代主义观念等,是全面了解一个世纪前马来人信仰状况,特... 详细信息

著名马来人学者扎巴在20世纪30年代对马来人习俗及宗教的讨论,涉及马来人信仰伊斯兰教的历史、马来人中的印度教和万物有灵论成分、伊斯兰现代思潮、宗教派别及其观点、马来人的现代主义观念等,是全面了解一个世纪前马来人信仰状况,特别是当时出现的教派分裂及思想的重要资料。

关键词：扎巴马来人伊斯兰教派思潮

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influence of recycled polyethylene terephthalate fibres on plastic shrinkage and mecha.ical properties of concrete

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Frontiers of Structural and Civil Engineering 2022年第6期16卷 792-802页

作者： NecatÖZa.iK Özgür EREN Department of Civil Engineering Eastern Mediterranean UniversityMersin 99628Turkey

Polyethylene terephthalate bottles production has drastically increased year after year due to high versa.ility of polyethylene terephthalate plastics and considerable consumption of *** tandem with that increase,the major concern of society has been the improper disposal of this non-biodegradable material to the *** deal with this concern,recycled polyethylene terephthalate bottles were incorporated in concrete as fibre reinforcements in this *** objective of this research is to evaluate the mecha.ical properties of recycled polyethylene terephthalate fibre reinforced concrete(RPFRC)in compa.ison with control concrete without *** terephthalate fibres with three different diameters(0.45,0.65,and 1.0 mm)and two lengths(20 and 30 mm)were added at va.ious proportions(0.5%,1.0%,1.5%and 2.0%)by volume of concrete in order to determine the effect of fibres initially on compressive,flexural and splitting tensile strengths of *** results revealed that none of the fibres have detrimental effects up to 1%volume fraction,however further addition caused slight reductions on mecha.ical properties in some *** shrinkage resistance and impact resistance tests were also performed according to related *** terephthalate fibres were observed to have marked improvements on those *** a good performance could be attributed prima.ily to the bridging effect of fibres.

关键词： recycled PET fibre-reinforced concrete mecha.ical properties plastic shrinkage impact energy

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Understanding the Recovery of the intervertebral Disc:A Comprehensive Review of in Vivo and in Vitro Studies

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Journal of Bionic Engineering 2024年第4期21卷 1919-1948页

作者： Faten Feki Fahmi zaïri Abderrahman Tamoud Melissa Moulart Rym Taktak Nader Haddar Fahed zaïri Sfax University ENISMaterials Engineering and Environment Laboratory3038SfaxTunisia University of Lille IMT Nord EuropeJUNIAUniversity of ArtoisULR 4515-LGCgELaboratoire de Génie Civil et geo-Environnement59000LilleFrance PrediTwins Lab 59000LilleFrance Japet Medical Device 59000LilleFrance Sfax University ENISLaboratory of Advanced Materials3038SfaxTunisia Ramsay Générale de Santé Hôpital PrivéLe Bois59000LilleFrance

Within the consistent daily rhythm of human life,intervertebral discs endure a va.iety of complex loads beyond the influences of gra.ity and muscle forces,lea.ing to significant morphological changes(in terms of volume,area,and height)as well as biomecha.ical altera.ions,including an increase in disc stiffness and a decrease in intra.iscal ***,the discs demonstrate an a.ility to regain their original morphological and biomecha.ical characteristics after a period of nocturnal *** preserva.ion of normal disc function is critically dependent on this recovery phase,which serves to forestall premature disc *** phenomenon of disc recovery has been extensively documented through numerous in vivo studies employing advanced clinical techniques such as Magnetic Resonance ima.ing(MRi),sta.iometry,and intra.iscal pressure ***,the findings from in vitro studies present a more complex picture,with reports varying between full recovery and only partial recupera.ion of the disc ***,research focusing on degenerated discs in vitro has shed light on the quantifiable impact of degenera.ion on the disc a.ility to *** dyna.ics within the disc are considered a primary factor in recovery,yet the disc intricate multiscale structure and its viscoelastic properties also play key *** elements interact in complex ways to influence the recovery mecha.ism,particularly in rela.ion to the overall health of the *** objective of this review is to collate,analyze,and critically evaluate the existing body of in vivo and in vitro research on this topic,providing a comprehensive understanding of disc recovery *** understanding offers a blueprint for future advancements in medical treatments and bionic engineering solutions designed to mimic,support,and enhance the natural recovery processes of intervertebral discs.

关键词： intervertebral disc Recovery in vivo vs.in vitro studies Degenera.ion Viscoelastic effects Fluid dyna.ics

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Journal of Materials Science & Technology 2022年第1期96卷 248-261页

作者： Seyedmohammad Tabaie Farhad Rézaï-a.ia Bertrand C.D.Flipo Mohammad Jaha.i Department of Mecha.ical Engineering École de Technologie Supérieure(ÉTS)H3C 1K3 MontrealQCCanada institut Clément Ader(iCA) Universitéde ToulouseCNRSIMT Mines AlbiINSAUPSISAECampus Jarlard81013 AlbiFrance TWi Ltd Granta ParkGreat AbingtonCambridge CB216ALUnited Kingdom

The continuous growth in the manufacture of aerospace components such as blisks has led to an increase in the applica.ion of different hybrid materials fabrica.ing methods,and thus the requirements for joining and strengthening of dissimilar *** to this goal,selective laser melted(SLM)inconel718 was joined with forged AD730^(TM)Nickel-based superalloy through linear friction welding(LFW)in this *** va.ia.ion,specifically with respect to secondary phases precipita.ion was *** microhardness and strengthening mecha.isms of the weldment were also *** precipita.ion(volume fraction and size of particles)at different regions of both sides of the weld line was *** to the weld line,the dissolution ofγ’/γ"and Laves phases and grain refinement occurred which reveals the effects of both compression strain and high temperature on recrystalliza.ion and high degree of elemental diffusion in the weld zone(WZ).it is shown that the size,volume fraction,and shape of secondary phases increased and changed(from spherical to long-striped for Laves particles)as we went from the WZ toward the base ***,the measured microhardness indicated that the strength of AD730^(TM)alloy depends significantly on the grain size,while strength in SLM inconel 718 was dominated by shape(or size)and the presence of secondary phases(γ’/γ"and Laves).

关键词： Additive manufacturing Linear friction welding Ni-based superalloy Precipita.ion Microhardness Strengthening mecha.isms

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Junction properties and conduction mecha.ism of new terbium complexes with triethylene glycol ligand for potential applica.ion in orga.ic electronic device

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Journal of Rare Earths 2014年第7期32卷 633-640页

作者： N.K.za’aba M.A.Mohd Sarjidan W.H.Abd.Ma.id Eny Kusrini Muhammad i.Saleh Low Dimensional Materials Research Centre Physics DepartmentUniversity Malaya Department of Chemical Engineering Faculty of EngineeringUniversitas Indonesia School of Chemical Sciences Universiti Sains Malaysia

Terbium-picrate triethylene glycol（EO3-Tb-Pic） complex was prepared in thin film and single layer device structure of iTO/EO3-Tb-Pic/Al, using spin coa.ing technique. The UV-Vis absorption spectroscopy analysis was performed to evaluate the electronic molecular transition of the complex. The optical band gap, Eg estimated from the Tauc model revealed that EO3-Tb-Pic thin film exhibited a direct transition with Eg of 2.70 eV. The electronic parameters of the iTO/EO3-Tb-Pic/Al device such as the idea.ity factor n, barrier height Φb, satura.ion current io, and series resistance Rs, were extracted from the conventional lni-V, Cheung＇s functions and Norde＇s method. it was found that the evaluated parameters calculated from Norde＇s and Cheung＇s methods were consistent with those calculated from the conventional i-V method. in the double loga.ithmic i-V plot, three distinct regions based on the slope were identified, and the conduction mecha.isms were discussed and explained. The mobility, μ value was estimated from SCLC region as 2.58×10^–7 cm2/（V·s）. This newly obtained lantha.ide complex may be potentially utilized in electronic devices.

关键词： terbium-picrate complex triethylene glycol Tauc model optical band gap current-voltage rare earths

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A group priority earliest deadline first scheduling algorithm

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Frontiers of Computer Science 2012年第5期6卷 560-567页

作者： Qi Li Wei ba School of Control Science and Engineering Dalian University of TechnologyDalian 116024China Science and Technology on Underwater Test and Control Laboratory Dalian 116013China

in most priority scheduling algorithms, the num- ber of priority levels is assumed to be unlimited. However, if a task set requires more priority levels than the system can support, several jobs must in practice be assigned the same priority level. To solve this problem, a novel group priority earliest deadline first （GPEDF） scheduling algorithm is pre- sented. in this algorithm, a schedula.ility test is given to form a job group, in which the jobs can arbitra.ily change their or- der without reducing the schedula.ility. We consider jobs in the group ha.ing the same priority level and use shortest job first （SJF） to schedule the jobs in the group to improve the performance of the system. Compared with earliest deadline first （EDF）, best effort （BE）, and group-EDF （gEDF）, simu- la.ion results show that the new algorithm exhibits the least switching, the shortest average response time, and the fewest required priority levels. it also has a higher success ra.io than both EDF and gEDF.

关键词： real-time system group priority success ra.io,switching

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