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Seismic performance of composite moment-resisting frames achieved with sustainable CFST members

Frontiers of Structural and Civil Engineering 2016年第3期10卷 312-332页

作者： A. SILVA y. jiang L. MACEDO J. M. CASTRO R. MONTEIRO N. SILVESTRE Department of Civil Engineering Faculty of Engineering University of Porto Porto 4099-002 Portugal Istituto Universitario di Studi Superiori di Pavia Pavia 27100 Italy IDMEC LAETA Department of Mechanical Engineering Instituto Superior Tecnico Universidade de Lisboa Lisboa 1649-004 Portugal

The main objective of the research presented in this paper is to study.the bending behaviour of Concrete Filled Steel Tube （CFST） columns made with Rubberized Concrete （RuC）, and to assess the seismic performance of moment-resisting frames with these structural members. The paper describes an experimental campaign where a total of 36 specimens were tested, resorting to a novel testing setup, aimed at reducing both the preparation time and cost of the test specimens. Different geometrical and material parameters were considered, namely.cross-section ty.e, cross-section slenderness, aggregate replacement ratio, axial load level and lateral loading ty.e. The members were tested under both monotonic and cy.lic lateral loading, with different levels of applied axial loading. The test results show that the bending behaviour of CFST elements is highly.dependent on the steel tube properties and that the ty.e of infill does not have a significant influence on the flexural behaviour of the member. It is also found that Eurocode 4 is conservative in predicting the flexural capacity.of the tested specimens. Additionally. it was found that the seismic design of composite moment- resisting frames with CFST columns, according to Eurocode 8, not only.leads to lighter design solutions but also to enhanced seismic performance in comparison to steel frames.

关键词： concrete filled steel tubes rubberized concrete composite frames seismic performance assessment

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A LOOP DRAWBEAD RESTRAINING FORCE MODEL IN SHEET METAL DEEP DRAWING PROCESS

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Acta Metallurgica Sinica(English Letters) 2001年第5期14卷 380-386页

作者： y.J. Luo, S.P. Li, J.F. Zheng, D.N. He, y.Q. Zhang, J.L. Cheng and J. y. jiang 1)National Mold & Die CAD Engineering Research Center, Shanghai 200030, China 2)Shanghai Volkswagen Automotive Company.Ltd.(SVM), Shanghai 201805, China Shanghai Jiaotong Univ. Shanghai 200030 China

In sheet metal forming, drawbeads are often used to control uneven material flow which may.cause defects such as wrinkles, fracture, surface distortion and springback. Appropriate setting and adjusting the drawbead force is one of the most important pa- rameters in sheet metal forming process control. This paper derives the model of loop drawbead restraining force (DBRF) using plastic forming theory. and gives the min imum blankholding force. Experiments are carried out to verify.the proposed DBRF model. The good agreement between the calculated values and experiments data justi- fies the proposed loop drawbead restraining force model.

关键词： drawbead restraining force sheet metal deep drawing

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

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CSEE Journal of Power and Energy.Sy.tems 2024年第3期10卷 929-941页

作者： Tingy. jiang Ping Ju C.y.Chung y.zhong 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 been recognized as a valuable functionality.of power sy.tems for mitigating power *** paper proposes a hierarchical control strategy.among the distribution sy.tem operator(DSO),load aggregators(LAs),and thermostatically.controlled loads(TCLs);the strategy.includes a scheduling lay.r and an executive lay.r to provide load *** the scheduling lay.r,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 play.rs 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 lay.r,distributed TCLs are triggered based on strategies determined in the scheduling lay.r.A self-triggering method that does not violate user privacy.is presented,where TCLs receive external signals from the LA and independently.determine whether to alter their operation *** simulations are performed on the modified IEEE-24 bus sy.tem to verify.effectiveness of the proposed strategy.

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

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THE CRy.TALLIZATION KINETICS OF AN AMORPHOUS Ti-RICHNiTi FILM

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Acta Metallurgica Sinica(English Letters) 2000年第6期13卷 1131-1135页

作者： X. y. jiang, H.B. Xu and S.K. Gong (Department of Materials Science and Engineering, Beijing University.of Aeronautics and Astronautics,Beijing 100083, China)

The cry.tallization kinetics of an amorphous Ti-rich NiTi film (Ni 46.34at.%, Ti 53.66at.%)prepared by.DC magnetron sputtering was determined by.non-isothermal techniques. The activation energy.of cry.tallization and the mean value of the Avrami parameter are 382kJ/mol and 0.85, respectively. The calculated isothermal kinetic curse of amorphous film at 773K coincides with the result of X-ray.*** formation of a Ti2Ni phase is accompanied with the cry.tallization of Ti-rich NiTi film.

关键词： amorphous NiTi film cry.tallization kinetics activation energy.of cry.tallization

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Evaluating the Energy.Efficiency.Performance of a Micro Combustor with and without Heat Recuperation

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Open Journal of Energy.Efficiency 2012年第2期1卷 21-30页

作者： D. y. jiang W. M. y.ng N. Aqdas K. J. Chua Department of Mechanical Engineerings National University of Singapore Singapore

Micro-combustion research works are motivated by.development of portable, autonomous power generators such as the micro TPV with improvement in energy.density.over batteries. Heat recuperation is a technique which contributes to better energy.efficiency.performance by.recovering heat from the exhaust gas. In this paper, a numerical simulation is carried out to study.the impact of incorporating recuperation on the performance of micro modular combustor sy.tem. The simulation results have been validated by.experiments;achieving close agreement between simulated and experi-mental data. It was observed that the mean wall temperature, radiation power and emitter efficiency.markedly.improved with the incorporation of a heat recuperator. In addition, 25.8% enhancement of total radiation power and 30.6% emitter efficiency.could be realized when the hy.rogen air equivalence ratio was 0.9.

关键词： Modular Micro Combustor Recuperation Temperature Distribution Emitter Efficiency

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Heat Transfer and Friction Characteristics of Printed Circuit Heat Exchangers with Different Channel Structures for S-CO_(2) Power Sy.tem

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Journal of Thermal Science 2024年第3期33卷 1132-1147页

作者： jiang Tao LI Mingjia Key.Laboratory.of Thermo-Fluid Science and Engineering of Ministry.of Education School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an710049China School of Mechanical Engineering Beijing Institute of TechnologyBeijing100081China

Printed circuit heat exchanger(PCHE)has been widely.used in supercritical carbon dioxide(S-CO_(2))power sy.tems because of its high heat transfer efficiency.and good ***,due to the large variety.of PCHE configurations,channel selection in practical applications lacks a ***,this paper discussed the heat transfer and friction characteristics and the sy.ergy.of three fields in the channel under the guidance of the field sy.ergy.principle for four ty.ical PCHE ***,the comprehensive performance of four channels was ***,the heat transfer and friction factor correlations for S-CO_(2)in four channels were *** findings demonstrate that the sy.ergy.of velocity.and pressure fields of the straight channel PCHE is better(β≈180°),so its resistance loss is relatively.*** zigzag and sinusoidal wavy.channels and the airfoil fins can reduce the angle a between the temperature gradient and velocity.thus enhancing the heat *** sinusoidal wavy.channel can reduce flow resistance compared to the zigzag channel due to the rounded *** streamlined airfoil structure can guide the flow and reduce backflow,thus reducing resistance *** the range of Re studied in this paper,the maximum error of the proposed heat transfer and friction factor correlations of PCHE is 7.0%,which shows good fitting *** research in this paper can provide a reference for the selection and design of PCHE with different channel configurations.

关键词： printed circuit heat exchanger supercritical carbon dioxide ty.ical channel structure field sy.ergy.analy.is

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An improved initial rotor position estimation method using high-frequency.pulsating voltage injection for PMSM

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Defence Technology.防务技术） 2024年第3期33卷 19-29页

作者： y.ng jiang Ming Cheng School of Electrical Engineering Southeast UniversityNanjing 210096China

High frequency.pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet sy.chronous ***,traditional methods require a large number of filters,which leads to the deterioration of sy.tem stability.and dy.amic *** order to solve these problems,a new signal demodulation method is proposed in this *** proposed new method can directly.obtain the amplitude of high-frequency.current,thus eliminating the use of filters,improving sy.tem stability.and dy.amic performance and saving the work of adjusting filter *** addition,a new magnetic polarity.detection method is proposed,which is robust to current measurement ***,experiments verify.the effectiveness of the method.

关键词： Initial position detection Signal demodulation algorithm Magnetic polarity.detection Filter elimination

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Co/CoO heterojunction rich in oxy.en vacancies introduced by.O2 plasma embedded in mesoporous walls of carbon nanoboxes covered with carbon nanotubes for rechargeable zinc-air battery

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Carbon Energy 2024年第7期6卷 14-25页

作者： Leijun y. Weiheng Chen Zhong-Jie jiang Zhongqing jiang Key.Laboratory.of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhouChina Department of Mechanical Engineering Ningbo University of TechnologyNingboChina Guangzhou Key.Laboratory.for Surface Chemistry.of Energy.Materials Guangdong Engineering and Technology Research Center for Surface Chemistry of Energy MaterialsCollege of Environment and EnergySouth China University of TechnologyGuangzhouChina

Herein,Co/CoO heterojunction nanoparticles(NPs)rich in oxy.en vacancies embedded in mesoporous walls of nitrogen-doped hollow carbon nanoboxes coupled with nitrogen-doped carbon nanotubes(P-Co/CoOV@NHCNB@NCNT)are well designed through zeolite-imidazole framework(ZIF-67)carbonization,chemical vapor deposition,and O_(2) plasma *** a result,the threedimensional NHCNBs coupled with NCNTs and unique heterojunction with rich oxy.en vacancies reduce the charge transport resistance and accelerate the cataly.ic reaction rate of the P-Co/CoOV@NHCNB@NCNT,and they.display.exceedingly.good electrocataly.ic performance for oxy.en reduction reaction(ORR,halfwave potential[EORR,1/2=0.855 V *** hy.rogen electrode])and oxy.en evolution reaction(OER,overpotential(η_(OER,10)=377mV@10mA cm^(−2)),which exceeds that of the commercial Pt/C+RuO_(2) and most of the formerly.reported ***,both the aqueous and flexible foldable all-solid-state rechargeable zinc-air batteries(ZABs)assembled with the P-Co/CoOV@NHCNB@NCNT cataly.t reveal a large maximum power density.and outstanding long-term cy.ling ***-principles density.functional theory.calculations show that the formation of heterojunctions and oxy.en vacancies enhances conductivity.reduces reaction energy.barriers,and accelerates reaction kinetics *** work opens up a new avenue for the facile construction of highly.active,structurally.stable,and cost-effective bifunctional cataly.ts for ZABs.

关键词： heterojunction oxy.en evolution/reduction reaction oxy.en vacancies rechargeable zinc–air battery three‐dimensional nitrogen‐doped hollow carbon nanoboxes

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Hy.rid rogue waves and breather solutions on the double-periodic background for the Kundu-DNLS equation

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Communications in Theoretical Phy.ics 2024年第5期76卷 33-48页

作者： DongZhu jiang Zhaqilao College of Mathematics Science Inner Mongolia Normal UniversityHohhot 01022China Center for Applied Mathematical Science Inner MongoliaHohhot 010022China

In this paper,by.using the Darboux transformation(DT)method and the Tay.or expansion method,a new nth-order determinant of the hy.rid rogue waves and breathers solution on the double-periodic background of the Kundu-DNLS equation is constructed when n is *** and rogue waves can be obtained from this determinant,*** to this,the hy.rid rogue waves and breathers solutions on the different periodic backgrounds are given explicitly.including the single-periodic background,the double-periodic background and the plane wave background by.selecting different *** addition,the form of the obtained solutions is summarized.

关键词： double-periodic background hy.rid rogue waves and breather darboux transformation Kundu-DNLS equation

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A newly.unraveled 13.6-y.ar oscillation from GPS displacements and its potential implications for the dy.amic reference frame

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Science China Earth Sciences 2024年第10期67卷 3204-3212页

作者： Hao DING Weiping jiang School of Geodesy.and Geomatics Hubei Luojia LaboratoryWuhan UniversityWuhan 430079China GNSS Research Center Wuhan UniversityWuhan 430079China

Numerous practical geodetic and geophy.ical applications necessitate precise measurements of GNSS displacements at the millimeter or sub-millimeter level. To attain such precision, it is imperative to identify.and analy.e the unidentified decadal signals inherent in the GPS displacements. In this research, we employ.the optimal sequence estimation method to effectively.detect an about 13.6-y.ar oscillational signal with an excited amplitude of 3.6±1.2 mm in the U-components of the GPS displacements. It is noteworthy.that this signal demonstrates a consistent spatial pattern characterized by.the spherical harmonic y.(2,-2). We conduct a comparative analy.is with the 13.6-y.ar oscillation observed in length-of-day.variations(and geomagnetic records), finding that they.are in reverse phase. After eliminating the Earth's external excitation sources through the utilization of two distinct in-situ hy.rological records, we suggest that the 13.6-y.ar GPS signal may.come from the internal motions within the Earth. However, the specific excitation source and the detailed phy.ical mechanism remain uncertain. Additionally. we develop a mathematical displacement model to explain the 13.6-y.ar signal. Our findings indicate that this signal can result in displacements of up to 1.37 mm and velocity.effects of 0.63 mm/y.(for U-component) at maximum. These results underscore the necessity.of incorporating this 13.6-y.ar signal into the construction and maintenance of a dy.amic reference frame at the millimeter level.

关键词： GPS displacements Decadal changes 13.6-y.ar oscillation Displacement model Dy.amic reference frame

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