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Partition-based network equivalent Method for Power System Subsynchronous Oscillation Analysis

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Journal of Mode.n Power Systems and Cle.n energy 2024年第1期12卷 313-320页

作者： Chenxuan Wang Weimin Zheng Zhen Wang Yangqing Dan Ping ju the Department of electrical engineering Zhejiang UniversityHangzhou 310027China the economic Research Institute of State Grid Zhejiang electric Power Co. Ltd.Hangzhou 310016China the College of energy and electrical engineering Hohai UniverstiyNanjing 211100China

Given large-scale mode.n power systems with pow er electronic converters,the.numerical simulation with subsyn chronous oscillation(SSO)faces great challenges in engineering practice due to sharply enlarged modeling scale and high com putational *** reduce the modeling scale.network parti tion and equivalent becomes a vital technique in numerical sim *** several methods have be.n developed for net work equivalent,a generally accepted rule for network parti tion is still *** paper proposes that the system can be partitioned into three parts,i.e.,the inte.nal,the middle,and the exte.nal subsystems,in which the inte.nal subsystem consists of all power electronic components,the middle subsys tem includes those selected AC dynamic components with de tailed models,and the remaining components and buses consti tute the exte.nal *** exte.nal subsystem is further represented by an equivalent RLC network determined by the frequency dependent network equivalent(FDne)*** the proposed method,the observability index and the electrical distance index are used to identify the interface betwe.n the middle and the exte.nal *** studies based on a modified Hydro-Quebec system are used to verify the effective.ness of the proposed method.

关键词： electrical distance network equivalent subsyn chronous oscillation observability index

Hierarchical Control Strategy for Load Regulation Based on Stackelberg Game Theory Considering Randomness

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CSee Journal of Power and energy Systems 2024年第3期10卷 929-941页

作者： Tingyu Jiang Ping ju C.Y.Chung Yuzhong Gong College of energy and electrical engineering Hohai UniversityNanjing 211100China Department of electrical engineering City University of Hong KongHong Kong CF624China Department of electrical and Computer engineering University of SaskatchewanSaskatoonSK S7N 5A9Canada CSee Ieee

Demand response has be.n recognized as a valuable functionality of power systems for mitigating power *** paper proposes a hierarchical control strategy among the distribution system operator(DSO),load aggregators(LAs),and thermostatically controlled loads(TCLs);the strategy includes a scheduling layer and an executive layer to provide load *** the scheduling layer,the DSO(leader)offers compensation price(CP)strategies,and the LAs(followers)respond to CP strategies with available regulation power(ARP)*** of the DSO and LAs are modeled according to their behaviors during the load regulation *** game is adopted to capture interactions among the players and leader and to obtain the optimal strategy for each participant to achieve ***,considering inevitable random factors in practice,e.g.,renewable generation and behavior of users,two different stochastic models based on sample average approximation(SAA)and parameter modification are formulated with improved scheduling *** the executive layer,distributed TCLs are triggered based on strategies determined in the scheduling layer.A self-triggering method that does not violate user privacy is presented,where TCLs receive exte.nal signals from the LA and independently determine whether to alter their operation *** simulations are performed on the modified Ieee-24 bus system to verify effectiveness of the proposed strategy.

关键词： Demand response hierarchical control load regulation self-triggering method Stackelberg game

Boosted Lithium-Ion Transport Kinetics in n-Type Siloxene Anodes enabled by Selective.nucleophilic Substitution of Phosphorus

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nano-Micro Letters 2024年第10期16卷 618-637页

作者： Se In Kim Woong-ju Kim Jin Gu Kang Dong-Wan Kim School of Civil Environmental and Architectural EngineeringKorea University02841 SeoulSouth Korea nanophotonics Research Center Korea Institute of Science and Technology02792 SeoulSouth Korea

Doped two-dimensional(2D)materials hold significant promise for advancing many technologies,such as microelectronics,optoelectronics,and energy ***,n-type 2D oxidized Si nanosheets,namely n-type siloxene.n-SX),are employed as Li-ion battery *** thermal evaporation of sodium hypophosphite at 275℃,P atoms are effectively incorporated into siloxene(SX)without compromising its 2D layered morphology and unique Kautsky-type crystal ***,selective.nucleophilic substitution occurs,with only Si atoms be.ng replaced by P atoms in the O_(3)≡Si-H *** resulting n-SX possesses two delocalized electrons arising from the presence of two electron donor types:(i)P atoms residing in Si sites and(ii)H *** doping concentrations are varied by controlling the amount of precursors or their me.n free *** at 2000 mA g^(-1),the.n-SX electrode with the optimized doping concentration(6.7×10^(19) atoms cm^(-3))delivers a capacity of 594 mAh g^(-1) with a 73%capacity retention after 500 *** improvements originate from the enhanced kinetics of charge transport processes,including electronic conduction,charge transfer,and solid-state *** approach proposed here.n offers an unprecedented route for engineering SX anodes to boost Li-ion storage.

关键词： Li-ion battery Two-dimensional n-type siloxene Doping mechanism Kinetics

High na-ion conductivity andmechanical integrity of anion-exchanged polymeric hydrogel electrolytes for flexible sodium ion hybrid energy storage

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SusMat 2024年第1期4卷 140-153页

作者： jungWoo Hong Harpalsinh H.Rana jeong Hee Park jun Su Kim Sang Joon Lee Gun Jang Tae Hoon Kang Kang Ho Shin Sang Ha Baek Wooseok Yang Kwang Ho Kim ju-Hyuk Lee Ho Seok Park School of Chemical engineering Sungkyunkwan UniversitySuwonRepublic of Korea Cle.n energy Research Center Korea Institute of Science and Technology(KIST)SeoulRepublic of Korea KIST-SKKU Carbon-neutral Research Center Sungkyunkwan University(SKKU)SuwonRepublic of Korea SKKU Institute of energy Science and Technology(SIeST) Sungkyunkwan UniversitySuwonRepublic of Korea COSMOS LAB/92 Jomaru-ro 385beon-gilBucheon-siRepublic of Korea SKKU Advanced Institute of nano Technology(SAInT) Sungkyunkwan UniversitySuwonRepublic of Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan UniversitySuwonRepublic of Korea

The polymeric gel electrolytes are attractive owing to their higher ionic conductivities than those of dry polymer electrolytes and lowered water activity for enlarged potential ***,the ionic conductivity and mechanical strength of the.na-ion conducting polymeric gel electrolytes are limited by below 20 mS cm−1 and 2.2 ***,we demonstrate.na-ion conducting and flexible polymeric hydrogel electrolytes of the chemically coupled poly(diallyldimethylammonium chloride)-dextrin-n,n′-methylene-bisacrylamide film immersed in naClO_(4) solution(ex-DDA-Dex+naClO_(4))for flexible sodium-ion hybrid capacitors(f-nIHC).In particular,the anion exchange reaction and synergistic interaction of ex-DDA-Dex with the optimum ClO_(4)−enable to greatly improve the ionic conductivity up to 27.63 mS cm−1 at 25◦C and electrochemical stability window up to 2.6 V,whereas the double.networking structure leads to achieve both the mechanical strength(7.48 MPa)and softness of hydrogel ***,the f-nIHCs with the ex-DDA-Dex+naClO_(4) achieved high specific and high-rate capacities of 192.04 F g^(−1)at 500 mA g^(−1)and 116.06 F g^(−1)at 10000 mA g^(−1),respectively,delivering a large energy density of 120.03Wh kg^(−1)at 906Wkg^(−1)and long cyclability of 70%over 500 cycles as well as demonstrating functional operation under mechanical stresses.

关键词： anion exchange chemistry flexible energy storage hybrid energy storage hydrogel electrolytes renewable electrolytes sodium storage

Long-term trends in the abundance and breeding performance in Adélie penguins:the Argentine ecosystem Monitoring Program

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Advances in Polar Science 2024年第1期35卷 132-140页

作者： Mariana A.juÁReS AnahíM.SILVeSTRO Brenda C.ALFOnSO M.Mercedes SAnTOS Departamento Biología de Predadores Tope Instituto Antártico Argentino(IAA)Buenos Aires B1650CSPArgentina Consejo nacional de Investigaciones Científicas y Técnicas(COnICeT) Buenos Aires C1425FQBArgentina Laboratorios Anexos Facultad de Ciencias Naturales y MuseoUniversidad Nacional de La PlataLa Plata B1904AMAArgentina IneDeS(COnICeT-UnLu) Buenos Aires C1425FQBArgentina Facultad de Ciencias naturales y Museo Universidad Nacional de La PlataLa Plata B1900FWAArgentina Instituto Antártico Argentino(IAA) Buenos Aires B1650CSPArgentina

In this work,we report long-term trends in the abundance and breeding performance of Adélie penguins(Pygoscelis adeliae.nesting in three Antarctic colonies(i.e.,at Martin Point,South Orkneys Islands;Stranger Point/Cabo Funes,South Shetland Islands;and esperanza/Hope Bay in the Antarctic Peninsula)from 1995/96 to 2022/*** yearly count data of breeding groups selected,we observed a decline in the.number of breeding pairs and chicks in crèche at all colonies ***,the magnitude of change was higher at Stranger Point than that in the remaining ***,the index of breeding success,which was calculated as the ratio of chicks in crèche to breeding pairs,exhibited no apparent trend throughout the study ***,it displayed greater variability at Martin Point compared to the other two colonies under *** the.number of chicks in crèche of Adélie penguins showed a declining patte.n,the average breeding performance was similar to that reported in gentoo penguin colonies,specifically,those undergoing a population increase(even in sympatric colonies facing similar local conditions).Consequently,it is plausible to assume a reduction of the over-winter survival as a likely cause of the declining trend observed,at least in the Stranger Point and esperanza ***,we cannot rule out local effects during the breeding season affecting the Adélie population of Martin Point.

关键词： long-term monitoring Adélie penguin breeding pairs chicks crèched breeding success population trends

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Systematic Radio Telescope Alignment Using Portable Fringe Projection Profilometry

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nanomanufacturing and Metrology 2024年第1期7卷 75-85页

作者： Joel Berkson justin Hyatt nathan julicher Bye.ngjoon jeong Isaac Pimienta Rachel Ball Wyatt ellis Jason Voris Diego Torres‑Barajas Daewook Kim James C.Wyant College of Optical Sciences University of Arizona1630 E.University Blvd.TucsonAZ 85721USA Department of Astronomy at Steward Observatory University of Arizona933 N Cherry Ave.TucsonAZ 85721USA

In 2019,the event Horizon Telescope(eHT)released the first-ever image of a black hole event *** are.now aiming for higher angular resolutions of distant targets,like black holes,to understand more about the fundamental laws of gravity that gove.n our *** achieve this higher resolution and increased sensitivity,larger radio telescopes are.needed to operate at higher frequencies and in larger *** like the.next-generation Very Large Array(ngVLA)and the Square-Kilometer Array(SKA)require building hundreds of telescopes with diameters greater than 10 ms over the.next *** has a twofold *** telescope surfaces need to be more accurate to operate at higher frequencies,and the logistics involved in maintaining a radio telescope.need to be simplified to support them properly in large *** of these problems can be solved with improved methods for surface metrology that are faster and more accurate with a higher *** leads to faster and more accurate panel alignment and,therefore,a more productive *** this paper,we present the use of binocular fringe projection profilometry as a solution to this problem and demonstrate it by aligning two panels on a 3-m radio telescope *** measurement takes only 10 min and directly delivers feedback on the tip,tilt,and piston of each panel to create the ideal reflector shape.

关键词： Metrology Fringe projection profilometry Off-axis alignment Radio astronomy Radio ante.na

A Z/e isomeric cation designed organic-inorganic cadmium chloride ferroelectric with broadband white-light emission

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Science China Chemistry 2024年

作者： jun-Chao Qi Yan Qin Hang Peng Hui-Peng Lv Yong-ju Bai Xin Shen Zhang-Tian Xia Wei-Qiang Liao Ordered Matter Science Research Center Nanchang University

Hybrid organic-inorganic metal halides（HOMHs） have attracted tremendous interest in the past decades due to their diverse functional properties, such as ferroelectricity and luminescence. However, although a large.number of ferroelectric HOMHs and luminescent HOMHs have be.n reported, the HOMH ferroelectrics with white-light emission remain very sparse. Here, for the first time, by using the Z/e isomeric organic cation, we designed a cadmium-based HOMH ferroelectric [ee-PMU]CdCl4（eePMU = pyridin-2-ylmethanamide muconate） with broadband white-light emission. In contrast to the [ZZ-PMU]CdCl4with centrosymmetric crystal structure at room temperature, [ee-PMU]CdCl4adopts the polar crystal symmetry, which shows piezoelectricity with a piezoelectric coefficient of d33up to 19 pC/n and ferroelectricity with the saturated polarization of 1.52μC/cm2. Moreover, [ee-PMU]CdCl4exhibits a broadband white-light emission with an ultra-high color rendering index of 91 under UV excitation, which is related to the severely distorted [CdCl4]2-tetrahedron in the structure. To our knowledge, [eePMU]CdCl4is the first example of Z/e isomeric cation-designed HOMH ferroelectric and the first cadmium halide white-light emissive ferroelectric. This finding paves a new way for the design of organic-inorganic molecular ferroelectrics with white-light emission.

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Strong association of regulatory single.nucleotide polymorphisms (SnPs) of the IFITM3 gene with influenza H1n1 2009 pandemic virus infection

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Cellular & Molecular Immunology 2020年第6期17卷 662-664页

作者： Yong-Chan Kim Min-ju jeong Byung-Hoon jeong Korea Zoonosis Research Institute Chonbuk National UniversityIksanJeonbuk 54531Republic of Korea Department of Bioactive Material Sciences Chonbuk National UniversityJeonjuJeonbuk 54896Republic of Korea

The IFITM3 gene is classified as a member of the small interferonstimulated genes(ISGs)and plays a paramount role in defense against enveloped viruses,including influenza A viruses.1–6 Previous studies have reported that the rs12252 SnP,which is located in the open reading frame(ORF)of the IFITM3 gene,impacts the splicing procedure of prote.n production,which makes a truncated form of the IFITM3 prote.n and lowers its antiviral capacity.7–9 In addition,the rs34481144 SnP genotype affects the transcriptional regulation of the IFITM3 gene and IFITM3-neighboring genes and has a potent association with the clinical results of the H1n1 influenza 2009 pandemic in three human cohorts.10 Because several studies have reported that polymorphism of the IFITM3 gene is crucial in the host immune response,fine mapping of and extracting disease-associated SnPs from the human IFITM3 gene are important baseline studies necessary to understand how the IFITM3 prote.n functions in innate immunity.

关键词： IFITM3 influenza H1n1

Functionally graded structure of a nitride-strengthened Mg_(2)Si-based hybrid composite

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Journal of Magnesium and Alloys 2024年第3期12卷 1239-1256页

作者： jeongho Yang Woongbeom Heogh Hogi ju Sukhyun Kang Tae-Sik Jang Hyun-Do jung Mohammad Jahazi Se.ng Chul Han Se.ng Je Park Hyoung Seop Kim Susmita Bose Amit Bandyopadhyay Martin Byung-Guk jun Young Won Kim Dae-kyeom Kim Rigoberto CAdvincula Clodualdo Aranas Jr Sang Hoon Kim School of Mechanical engineering Pusan National UniversityBusan 46241Republic of Korea Department of Mechanical Design engineering Hanyang UniversitySeoul 04763Republic of Korea Process Research 3 Team LG Display Co.Ltd.PajuGyeonggi-do 10845Republic of Korea Department of Materials Science and engineering Chosun UniversityGwangju 61452Republic of Korea Institute of Well-Aging Medicare&Chosun University LAMP Center Chosun UniversityGwangju 61452Republic of Korea Division of Materials Science and engineering Hanyang UniversitySeoul 04763Republic of Korea Department of Mechanical engineering École de Technologie SupérieureMontrealQuebec H3C 1K3Canada Material&Component Convergence R&D Center Korea Construction Equipment Technology InstituteGunsanJeollabuk-do 54002Republic of Korea School of Mechanical and Aerospace engineering Nanyang Technological UniversitySingapore 639798Singapore Graduate Institute of Ferrous&eco Materials Technology Pohang University of Science and TechnologyPohangGyeongsangbuk-do 37673Republic of Korea Advanced Institute for Materials Research Tohoku UniversitySendai 980-8577Japan Institute for Convergence Research and education in Advanced Technology Yonsei UniversitySeoul 03722Republic of Korea School of Mechanical and Materials engineering Washington State UniversityPullmanWashington 99164USA School of Mechanical engineering Purdue UniversityWest LafayetteIndiana 47907USA Research Institute of Advanced Manufacturing Technology Korea Institute of Industrial TechnologyIncheon 21999Republic of Korea Department of Macromolecular Science and engineering Case Western Reserve UniversityClevelandOhio 44106USA Department of Chemical and Biomolecular engineering and Joint Institute for Advanced Materials University of TennesseeKnoxvilleTennessee 37996USA Center for nanophase Materials and Sciences Oak Ridge National LaboratoryOak RidgeTennessee 37830USA Department of Mechanical engineering University of New BrunswickFrederictonNew Brunswick E3B 5A3Cana

The ex-situ incorporation of the secondary SiC re.nforcement,along with the in-situ incorporation of the tertiary and quate.nary Mg_(3)n_(2) and Si_(3)n_(4) phases,in the primary matrix of Mg_(2)Si is employed in order to provide ultimate wear resistance based on the laser-irradiation-induced inclusion of n_(2) gas during laser powder bed *** is substantialized based on both the thermal diffusion-and chemical reactionbased metallurgy of the Mg_(2)Si–SiC/nitride hybrid *** study also proposes a functional platform for systematically modulating a functionally graded structure and modeling build-direction-dependent architectonics during additive *** strategy enables the development of a compositional gradient from the center to the edge of each melt pool of the Mg_(2)Si–SiC/nitride hybrid ***,the coefficient of friction of the hybrid composite exhibits a 309.3%decrease to–1.67 compared to–0.54 for the conventional nonre.nforced Mg_(2)Si structure,while the tensile strength exhibits a 171.3%increase to 831.5 MPa compared to 485.3 MPa for the conventional *** outstanding mechanical behavior is due to the(1)the complementary and synergistic re.nforcement effects of the SiC and nitride compounds,each of which possesses an intrinsically high hardness,and(2)the strong adhesion of these compounds to the Mg_(2)Si matrix despite their small sizes and low concentrations.

关键词： Laser powder bed fusion Mg_(2)Si-SiC/nitride hybrid composite Both the thermal diffusion-and chemical reaction-based metallurgy Functionally graded structure Compositional gradient Wear resistance.