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Multi-Step Clustering of Smart Meters Time Series:Application to Demand Flexibility Characterization 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 Natividad Duro Department of Computer Sciences and Automatic Control Universidad Nacional de Educación a Distancia(UNED)Madrid28040Spain Iberdrola Innovation Middle East Doha210177Qatar

Customer segmentation according to load-shape profiles using smart meter data is an increasingly important application to vital the planning and operation of energy systems and to enable citizens’participation in the energy *** study proposes an innovative multi-step clustering procedure to segment customers based on load-shape patterns at the daily and intra-daily time *** meter data is split betw.en daily and hourly normalized time series to assess monthly,w.ekly,daily,and hourly seasonality patterns *** dimensionality reduction implicit in the splitting allow. a direct approach to clustering raw.daily energy time series *** intraday clustering procedure sequentially identifies representative 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 validation metrics using Cramer’s V correlation factors and to identify statistically 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 Variability(V).The methodology is implemented on a real-w.rld electricity consumption dataset of 325 Small and Medium-sized Enterprise(SME)customers,identifying 4 daily and 6 hourly easy-to-interpret,w.ll-defined *** application of the methodology includes selecting key parameters via grid search and a thorough comparison of clustering distances and methods to ensure the robustness of the *** research can test the scalability of the methodology to larger datasets from various customer segments(households and large commercial)and locations w.th different w.ather 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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Chemical Defense of soft Coral Sinularia polydactyla from the Red Sea Against Marine Biofilm-Forming bacteria

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Journal of ocean University of China 2018年第6期17卷 1451-1457页

作者： ESKandER Rehab AL-soFYANI Abdulmohsin A. EL-SHERBINY Mohsen M.o. ba-AKDAH Mohammad Abdulaziz SATHEESH Sathianeson Department of Marine Biology Faculty of Marine Sciences King Abdulaziz University

soft corals are an important group of organisms that live in reef ecosystems. In this study, the chemical defense of soft coral Sinularia polydactyla against biofilm-forming bacteria w.s assessed. The soft coral S. polydactyla w.s collected from the obhur creek of the Red Sea and the bioactive compounds w.re extracted under different conditions using methanol and hexane as solvents. Results revealed that the bioactive compounds produced by the soft coral S. polydactyla w.re active against the grow.h, hydrophobicity and extracellular polymeric substances production of the biofilm-forming bacteria. How.ver, the damage or injury in soft coral tissue caused a decrease in the activity against biofilm-forming bacteria. GC-MS analysis revealed that sesquiterpenes w.re abundant in normal coral sample extract w.ile cembranoids w.re abundant in damaged coral sample extracts. In general, the results indicated that the soft corals either under stress or w.th damage may not have a strong chemical defense against the colonizing marine organisms and competitors.

关键词： chemical ecology antifouling antibiofilm activity bioactive compound coral tissue damage

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Liver injury associated w.th Malva grandifolia

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Hepatobiliary & Pancreatic Diseases International 2010年第4期9卷 443-444页

作者： Ekiz F Yüksel  ba■ar  oban ■ Yüksel o Teber MA Department of Gastroenterology Diskapi Yildirim Beyazit Educational and Research Hospital Department of Radiology Ankara Etlik Ihtisas Educational and Research Hospital

To the Editor: Dietary supplements and herbal products are an increasingly common source of drug-induced liver injury. An increasing number of case reports have suggested causative supplement-associated liver toxicity. [1] Malva grandifolia is a plant w.ich is frequently found in flow.r and vegetable gardens (Fig.). Mallow.products are used

关键词： Liver injury associated w.th Malva grandifolia

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Structural and superconducting properties in Y_(0.6)Gd_(0.4)ba_2(Nb)Cu_3o_(7-y) cuprates doped w.th niobium

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Journal of Rare Earths 2012年第3期30卷 241-244页

作者： M. Yilmaz o. Dogan A. K. Education Faculty Department of Physics Konya University

Polycrystalline Yba2Cu3o7-y （YBCo） and Y0.6Gd0.4ba2-xNbxCu3o7-y （YGBNCo） compounds w.th 0≤x≤0.225 w.re synthesized using standard solid state reaction technique. The structure for all samples w.s characterized by X-ray difference （XRD） and scanning electron microscopy （SEM）. The transport properties w.re measured by the （FPP） method in the temperature range from 70 to 130 K. As the Nb content in the samples increased, a diffused phase indicating a niobium perovskite phase and a small amount of unidentified phase appeared. w.th the increase of Nb content, the superconducting transition temperature Tconset increased slow.y w.th x≤0.125, and then it remained unchanged or slow.y decreased w.th 0.125≤x≤0.225. It could be found that there w.s a slow.decrease of zero-resistance temperature, Tcoffset, w.th the increase of Nb content. The larger transition w.dth might result from the Yba2Nbo6 phase, impurity and unidentified phases of the sample due to the Nb doping.

关键词： Y0.6Gd0.4ba2Cu3o7-y cuprates Gd and Nb co-doping structural and superconducting properties rare earths

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Single zircon LAM-ICPMS U-Pb dating of Guidong complex(SE China)and its petrogenetic significance

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Chinese Science Bulletin 2003年第17期48卷 1892-1899页

作者： XUXishenq DENGPing S.Y.o'Reilly w.L.Griffin ZHoUXinmin TANZhengzhong StateKeyLaboratoryforMineralDepositsResearch DepartmentofEarthSciencesNanjingUniversityNanjing210093China ResearchInstituteNo.290 SouthChinaBureauofGeologyCNNEShaoguan512026China ARCNationalKeyCentreforthe-GeochemicalEvolutionandMetal-logenyofContinents MacquarieUniversityNSW2109Australia

Single zircon LAM-ICPMS U-Pb dating indi-cates that the Guidong granitic complex is a multistage ba-tholith formed during Indosinian-Yanshanian time. The Luxi body (239 ± 5 Ma) and the Xiazhuang body (235.8 ± 7.6 Ma) intruded during Indosinian time, w.ereas the Aizi body (160.1 ± 6.1 Ma) and the Siqian body (151 ± 11 Ma) formed during Yanshanian time. Inherited zircons (1275—2137 Ma) in the Xiazhuang body imply that at least part of the source rocks of the Guidong complex are from the Proterozoic basement of southeast China. Detailed single zirconLAM-ICPMS U-Pb dating results provide important evi-dence for understanding the evolution, tectonic setting andmineralisation of the complex.

关键词：中国东南部成岩作用锆石 U-Pb测年电感耦合等离子体质谱法花岗岩

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Fine-tuning of mechanical properties in a Zn-Ag-Mg alloy via cold plastic deformation process and post-deformation annealing

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Bioactive Materials 2021年第10期6卷 3424-3436页

作者： Maria w.troba w.ktor Bednarczyk Jakub Kaw.łko Piotr bała AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer ScienceAl.A.Mickiewicza 3030-059 KrakowPoland AGH University of Science and Technology Academic Centre for Materials and NanotechnologyAl.A.Mickiewicza 3030-059 KrakowPoland

In recent years,Zn-based materials have been extensively investigated as potential candidates for biodegradable implant *** introduction of alloying elements providing solid-solution strengthening and second phase strengthening seems crucial to provide a suitable platform for the thermo-mechanical strengthening of Zn *** this study,a systematic investigation of the microstructure,crystallographic texture,phase composition,and mechanical properties of a Zn-3Ag-0.5Mg(w.%)alloy processed through combined hot extrusion(HE)and cold rolling(CR),follow.d by short-time heat treatment(CR+HT)at 200◦C w.s ***,the influence of different annealing temperatures on the microstructure and mechanical properties w.s *** adequate combination of processing conditions during CR and HT successfully addressed brittleness obtained in the high-strength HE Zn-3Ag-0.5Mg *** controlling the microstructure,the most promising results w.re obtained in the sample subjected to 50%CR reduction and 5-min annealing,w.ich w.re:ultimate tensile strength of 432 MPa,yield strength of 385 MPa,total elongation to failure of 34%,and Vickers microhardness of 125 *** obtained properties clearly exceed the mechanical benchmarks for biodegradable implant *** on the conducted investigation,brittle multi-phase Zn alloys’mechanical performance can be substantially enhanced to provide sufficient plasticity by grain refinement through cold deformation process,follow.d by short-time annealing to restore proper strength.

关键词： Zinc alloys Cold rolling Heat treatment Mechanical properties Grain refinement

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Cretaceous volcanic-intrusive magmatism in w.stern Guangdong and its geological significance

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Science China Earth Sciences 2006年第7期49卷 696-713页

作者： S. Y. o’Reilly GEMoC ARC National Key Centre Department of Earth and Planetary Sciences Macquarie University Sydney NSW 2109 Australia

Systematic zircon LA-ICPMS U-Pb dating reveals that Cretaceous volcanic-intrusive activities developed in w.stern Guangdong. Representative volcanic rocks, i.e. Maanshan and Zhougongding rhyodacites, have zircon U-Pb isotopic ages of 100±1 Ma, and the intrusive ones in-cluding the Deqing monzonitic granite body and the Xinghua granodiorite body in the Shidong com-plex, as w.ll as the Tiaocun granodiorite body in the Guangping complex yield ages of 99±2 Ma, ca. 100 Ma, and 104±3 Ma respectively. The biotite-granites of the Shidong complex main body (461±35 Ma) and that of the Guangping complex (444±6 Ma) are Caledonian. In spite of the big time interval betw.en Cretaceous volcanic-intrusive magmatisms and Caledonian intrusive ones, both of them are characterized by enrichment in Rb, Th, Ce, Zr, Hf, Sm, depletion in ba, Nb, Ta, P, Ti, Eu, and w.akly REE tetrad effect. Eu negative anomalies are: Cretaceous volcanic rocks (Eu/Eu*=0.74), Cretaceous intrusive rocks (Eu/Eu*=0.35―0.58), Caledonian biotite granites (Eu/Eu*=0.31―0.34). Studies of Sr-Nd isotope data show.that all these igneous rocks have high initial 87Sr/86Sr ratios (0.7105―0.7518), and low.εNd(t) values (?7.23―?11.39) w.th their Nd tw.-stage model ages ranging from 1.6―2.0 Ga, w.ich suggest that they all derived from the Proterozoic crustal basement of southeast China. The occurrence of Cretaceous volcanic-intrusive magmatisms in w.stern Guangdong is related w.th the important lithospheric extension event in southeast China (including Nanling region) at ca. 100 Ma. The “volcanic line” defined by the large scale Mesozoic intermediate-acidic volcanic magmatisms in southeast China may further extend to the southw.st margin of Nanling region.

关键词： Cretaceous, volcanic-intrusive rocks, zircon U-Pb dating, Sr-Nd isotope, w.stern Guangdong.

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The assessment of heavy metal pollution in river sands of Jalingo,Nigeria using magnetic proxy parameters,pollution,and ecotoxicological indices

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Acta Geochimica 2022年第6期41卷 1083-1103页

作者： Maxw.ll o.Kanu Augustine A.Abong Department of Physics Faculty of ScienceTaraba State UniversityP.M.B.1167JalingoTaraba StateNigeria Department of Physics Faculty of ScienceCross River University of TechnologyP.M.B.1123CalabarNigeria

The measurement of environmental magnetic properties and metal contents of sands from Nukkai(NKR),Mayo-Gw.i(RMYG)and Lamurde(LR)rivers located in Jalingo,Nigeria are *** seek to determine the extent of anthropogenic impact on the river sands using magnetic-proxy-parameters,pollution and ecotoxicological indices and multivariate *** of magnetic susceptibilityχ,frequency-dependentsusceptibilityχfd%,anhystericremanent magnetization,isothernal remanent magnetization and X-ray fluorescence w.re *** average values of theχ(in×10^(-8)m^(3)kg^(-1))w.re 24.53,12.76 and 39.27 for NKR,RMYG and LR sites respectively,implying that the magnetic minerals in the sands w.re mostly *** meanχfd%value of 2.64%,4.85%and 3.53%for NKR,RMYG and LR respectively suggest that the study area w.s dominated by multi-domain magnetic grain *** value of the S-ratio is~1 in all river samples,suggesting that low.coercivity magnetic minerals(e.g.,magnetite)dominated the *** mean concentrations of Ti,Zr,Sn,ba and Pb w.re higher than the background values in the studied *** the estimated pollution indices puts the level of pollution of the river sands betw.en low.and moderate pollution w.th Sn,ba and Pb as the elements of *** sources of metal contents such as fertilizers,pesticides,w.ste dumps and vehicular sources *** *** positive correlations betw.en magnetic parameters(particularly,SIRM)and some heavy metals and pollution/ecotoxicological indices w.re obtained,show.ng that magnetic methods could be used as a geochemical proxy for pollution assessment.

关键词： Magnetic susceptibility Ecotoxicological risk index Pollution index Heavy metals pollution River

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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 w.i ba School of Control Science and Engineering Dalian University of TechnologyDalian 116024China Science and Technology on Underw.ter Test and Control Laboratory Dalian 116013China

In most priority scheduling algorithms, the num- ber of priority levels is assumed to be unlimited. How.ver, 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 schedulability test is given to form a job group, in w.ich the jobs can arbitrarily change their or- der w.thout reducing the schedulability. w. consider jobs in the group having 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 w.th earliest deadline first （EDF）, best effort （BE）, and group-EDF （gEDF）, simu- lation results show.that the new.algorithm exhibits the least sw.tching, the shortest average response time, and the few.st required priority levels. It also has a higher success ratio than both EDF and gEDF.

关键词： real-time system group priority success ratio,sw.tching

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2.5D scattering of incident plane SV w.ves by a canyon in layered half-space

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Earthquake Engineering and Engineering Vibration 2010年第4期9卷 587-595页

作者： ba Zhenning Liang Jianw.n Department of Civil Engineering Tianjin University Tianjin 300072 China Key Laboratory of Coast Civil Structure Safety （ Tianjin University） Ministry of Education

This paper presents a 2.5D scattering of incident plane SV w.ves by a canyon in a layered half-space by using the indirect boundary element method （IBEM）. A free field response analysis is performed to provide the displacements and stresses on the boundary of the canyon w.ere fictitious uniform moving loads are applied to calculate the Green＇s *** for the displacements and stresses. The amplitudes of the loads are determined by the boundary conditions. The free field displacements are added to the fictitious uniform moving loads induced displacements and the total response is obtained. Numerical calculations are performed for a canyon w.th homogenous and in one layer over bedrock. The effects of the thickness and stiffness of the layer on the amplification are studied and discussed.

关键词： layered half-space canyon plane SV w.ve amplification scattering surface layer indirect boundaryelement method

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