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Predicting transformer temperature field based on physics-informed neural networks

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High Voltage 2024年第4期9卷 839-852页

作者： pengfei tang Zhonghao Zhang Jie Tong Tianhang Long Can Huang Zihao Qi China Electric Power Research Institute BeijingChina

The safe operation of oil-immersed transformers is critical to the safety and stability of the power *** the operating time increases,the failure rate of oil-immersed transformers shows an increasing trend,posing serious challenges to safe *** is necessary to investigate the internal state of the oil-immersed transformer to improve the digital degree and achieve digitalisation and intelligent operation and maintenance.A physics-informed neural network(PINN)for oil-immersed transformers was introduced to reconstruct the temperature distribution inside the *** to the approach,the loss function of the network would be optimised by incorporating physical constraint loss terms including heat transfer equations,initial conditions and boundary *** results show that the method proposed can be used to reconstruct and predict the temperature field of transformers in a few seconds with satisfactory *** conclusion,the PINN proposed outperforms deep neural networks in terms of accuracy,reliability and interpretability,especially in data-poor cases.

关键词： immersed conclusion constraint

Structure,magnetic properties and magnetocaloric effects of Fe_(50)Mn_(15-x)Co_xNi_(35) alloys

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Science China(Physics,Mechanics & Astronomy) 2014年第3期57卷 437-441页

作者： ZHONG XiChun TIAN HuaCun tang pengfei LIU ZhongWu ZHENG ZhiGang ZENG DeChang School of Materials Science and Engineering South China University of Technology

FesoMn15-xCoxNi35 （x=0, 1, 3, 5, 7） alloys were prepared by arc melting under purified argon atmosphere. The ingots were homogenized at 930℃ for 90 h followed by water quenching. The crystal structure, magnetic properties and magnetocaloric effects of the alloys were studied by X-ray diffraction （XRD） and MPMS-7-type SQUID. The results show that all samples still maintained a single γ-（Fe, Ni）-type phase structure. With the increase of the content of Co, the Curie temperatures of these alloys increased and exhibited a second-order magnetic transition from ferromagnetic （FM） to paramagnetic （PM） state near Curie temperature. The maximum magnetic entropy change and the relative cooling power of Fe50Mn10CosNi35 alloy was 2.55 J/kg.K and 181 J/kg, respectively, for an external field change of 5 T. Compared with rare earth metal Gd, FesoMnls-xCoxNi35 series of alloys have obvious advantage in resource price; their Curie temperatures can be tuned to near room temperature, maintain a relatively large magnetic entropy change at the same time and they are a type of potential magnetic refrigeration materials near room temperature.

关键词： Fes0Mnl5-xCoxNi35 alloys magnetic refrigeration Curie temperature magnetocaloric effect

Diverse Ring-seco Limonoids from Munronia unifoliolata and Their Biological Activities

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Chinese Journal of Chemistry 2022年第1期40卷 123-136页

作者： Yunpeng Sun Qiurong Li Letian Cui pengfei tang Yongyi Li Lingyi Kong Jun Luo Jiangsu Key Laboratory of Bioactive Natural Product Research State Key Laboratory of Natural MedicinesDepartment of Natural Medicinal ChemistryChina Pharmaceutical UniversityNanjingJiangsu 210009China

Twenty-two new limonoids,mufolinoids A—V(1—22),including six rings A,B-seco limonoids(1—6),twelve ring A-seco limonoids(7—18),four ring-intact limonoids(19—22),together with thirteen known compounds(23—35)were isolated from Munronia *** structures including absolute configurations were elucidated by combination of NMR,HR-MS,single-crystal X-ray diffraction and calculations of ECD and NMR *** 24,25,33,34 could be significantly reversed the multidrug resistance of MCF-7/doxorubicin(DOX)cells,and the reversal fold(RF)was much higher than that of positive drug *** 24,28,and 29 exhibited significant anti-inflammatory activity with the IC50 values in the range of 17.7—39.4μmol/***,compound 29 could markedly inhibit the release of IL-1βby inhibiting the initiation and assembly of NLRP3 inflammasome,which demonstrates the great potential of limonoids as an anti-inflammatory agent.

关键词： Munronia unifoliolata Limonoids Structure elucidation Inflammatory Natural products

Surface active functional groups enhanced PET non-woven fabric for the filtering of harmful substances in smoke

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Biosurface and Biotribology 2024年第1期10卷 1-6页

作者： Lu Ning pengfei tang Xiong Lu Guangyuan Yang Faxing Jiang Hongping Zhang China Tobacco Hubei Industrial Co LtdWuhanChina Failure Mechanics&Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan ProvinceCollege of Architecture&EnvironmentSichuan UniversityChengduChina School of Materials Science and Engineering Key Lab of Advanced Technologies of MaterialsMinistry of EducationSouthwest Jiaotong UniversityChengduSichuanChina School of Mechanical Engineering Institute for Advanced StudyChengdu UniversityChengduChina

Harmful components in cigarette smoke,such as nicotine,tar,and organic particulate matter,are the primary culprits behind lung *** conventional filter materials based on cellulose,carbon,and molecular sieves exhibit commendable filtration capabilities,their high cost restricts their widespread *** on this,the authors aim to prepare PET-based filter materials with good adsorption properties through a simple surface functionalisation *** adsorption performance of the PET-based non-woven fabric was enhanced by the introduction of sodium alginate(SA).The gas adsorption experiments results reveal that SA-modified PET(SA-PET)exhibits significantly improved filtration efficiency for nicotine,tar,and total particulate matter—increasing by 27.1%,26.2%,and 21.3%,***,SA-PET exhibits more odour control ability than traditional activated carbon-based filter *** results prove that surface-functionalised SA-PET has better filtration performance for harmful substances in smoke and provides a new strategy for the design of high-performance filtration materials.

关键词： adsorption mechanism polymers

Mufolinin A,an unprecedented ring A-seco 10-ethyllimonoid from Munronia unifoliolata

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Chinese Chemical Letters 2022年第1期33卷 516-518页

作者： Yunpeng Sun Letian Cui Qiurong Li pengfei tang Yongyi Li Wenjun Xu Jun Luo Lingyi Kong Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines School of Traditional Chinese PharmacyChina Pharmaceutical UniversityNanjing 210009China

Mufolinin A(1),a ring A-seco rearranged limonoid with an unprecedented ethyl at C-10 and novel 6/6/6/5 fused-ring skeleton,together with three new potential precursors(ring A-seco limonoids,2–4)were isolated from Munronia *** structures and absolute configurations were confirmed by nuclear magnetic resonance(NMR),high resolution electrospray ionization mass spectroscopy(HRESIMS),X-ray crystallography,electronic circular dichroism(ECD)calculations and NMR calculations with DP4+*** unprecedented ethyl group of 1 was hypothesized to be derived from methyl migration and ring reduction rearrangement of ring A-seco limonoid *** 2 and 4 showed significant multidrug resistance(MDR)reversal activities in MCF-7/DOX cells with reversal fold(RF)values of 13.1 and 8.0,respectively.

关键词： Meliaceae Munronia unifoliolata Limonoids Anti-inflammatory Anti-multidrug resistance

Spirolindemers A and B,Lindenane Sesquiterpenoid Oligomers Equipped with Oxaspiro[4.5]decane from Chloranthus henryi

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Chinese Journal of Chemistry 2022年第5期40卷 603-608页

作者： Jixin Li Jun Chi pengfei tang Yunpeng Sun Weijia Lu Wenjun Xu Yongyue Wang Jun Luo Lingyi Kong Jiangsu Key Laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines School of Traditional Chinese PharmacyChina Pharmaceutical UniversityNanjingJiangsu210009 China

Spirolindemers A and B,unprecedented lindenane sesquiterpenoid dimer(1)and trimer(2)equipped with oxaspiro[4.5]decane unit,were discovered from the medicinal plant Chloranthus *** structures including absolute configurations were achieved by HRMS,NMR,ECD,X-ray diffraction analyses,and quantum chemical ***,hetero-and homo-Diels-Alder additions may dominate the formation of oxaspiro[4.5]decane and spiro[4.5]decane skeletons,*** 1 showed anti-inflammatory activity by inhibiting the expression of iNOS and COX-2.

关键词： Lindenane sesquiterpenoid oligomers Chloranthus henryi Natural products Structure elucidation Biological activity

Sarcaglarols A-D, Lindenane-Monoterpene Heterodimers from Sarcandra glabra Based on Molecular Networks

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Chinese Journal of Chemistry 2021年第1期39卷 129-136页

作者： Yongyue Wang Zhirong Cui Jun Chi pengfei tang Meihui Zhang Jixin Li Yongyi Li Hao Zhang Jun Luo Lingyi Kong Jingsu Key laboratory of Bioactive Natural Product Research and State Key Laboratory of Natural Medicines School of Taditional Chinese PharmacyChina Pharmaceutical UniversityNanjingJiangsu 210009China

Sarcaglarols A-D(1-4),two pairs of lindenane-monoterpene heterodimers fused by a 1,2-dioxane moiety,were discovered and isolated from the leaves of Sarcandra glabra guided by MS/MS molecular networking-based *** planar structures,absolute configurations of basic skeleton and flexible polyhydric side chain were established by analysis of HRESIMS,NMR spectroscopic data,ECD spectrum,and the X-ray diffraction study of isopropylidene *** intermolecular[2+2+2]cycloaddition may play a key role in the biosynthesis pathway of the 1,2-dioxane moiety fused lindenane-monoterpene heterodimer skeleton,which can be recognized as the biogenetic precursors of our previous reported lindenane-normonoterpene *** addition,compounds 1,3 and 4 exhibited moderate inhibitory effects of lipid accumulation in free fatty acid-exposed L02 cells.

关键词： Sarcandra glabra Molecular networks Natural products Structural elucidation Peroxides

Magnetic properties and magnetocaloric effects in amorphous and crystalline Gd_(55)Co_(35)Ni_(10) ribbons

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Science China(Physics,Mechanics & Astronomy) 2013年第6期56卷 1096-1099页

作者： ZHONG XiChun tang pengfei GAO BeiBei MIN JiXiong LIU ZhongWu ZHENG ZhiGang ZENG DeChang YU HongYa QIU WanQi School of Materials Science and Engineering South China University of Technology

The magnetic properties and magnetocaloric effects of amorphous and crystalline Gd55Co35Ni10 ribbons are investigated.A main phase with a Ho 12 Co 7-type monoclinic structure(space group P21/c) and a minor phase with a Ho4Co3-type hexagonal structure(space group P63/m) are obtained for crystalline ribbon after *** amorphous ribbons order ferromagnetically and undergo a second-order transition at 192 *** crystalline Gd55Co35Ni10 ribbons,two magnetic phase transitions occur at 158 and 214 K,*** peak value of-△SM under a field change of 0-5 T is 6.5 J/kg K at 192 K for amorphous Gd55Co35Ni10 ribbons.A relatively large magnetic entropy change(～5.0 J/kg K) under a field change of 0-5 T for the crystalline Gd55Co35Ni10 ribbons is obtained in the temperature interval range of 154-214 *** large platform of magnetic entropy change and the negligible thermal/magnetic hysteresis loss mean the crystalline Gd55Co35Ni10 compound can satisfy the requirement of the Ericsson-type refrigerator working in the temperature range from 154K to 214K.

关键词： Gd55Co35Ni10 ribbon magnetocaloric effect magnetic refrigeration

Investigation of Strain-Temperature Cross-Sensitivity of FBG Strain Sensors Embedded Onto Different Substrates

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Photonic Sensors 2023年第1期13卷 85-101页

作者： Heying QIN pengfei tang Jing LEI Hongbin CHEN Boguang LUO Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi Guilin University of TechnologyGuilin 541004China Guangxi Engineering Research Center of Intlligent Structural Material Guilin University of TechnologyGuilin 541004China Guangxi Key Laboratory of Geotechnical Mechanics and Engineering Guilin University of TechnologyGuilin 541004China

The strain-temperature cross-sensitivity problem easily occurs in the engineering strain monitoring of the self-sensing embedded with fiber Bragg grating(FBG)*** this work,a theoretical investigation of the strain-temperature cross-sensitivity has been performed using the temperature reference grating *** experimentally observe and theoretically verify the problem,the substrate materials,the preloading technique,and the FBG initial central wavelength were taken as main *** a series of sensitivity coefficients calibration tests and temperature compensation tests have been designed and carried *** was found that when the FBG sensors were embedded on different substrates,their coefficients of the temperature sensitivity were significantly ***,the larger the coefficients of thermal expansion(CTE)of substrates were,the higher the temperature sensitivity coefficients would *** the other hand,the effect of the preloading technique and FBG initial wavelength was negligible on both the strain monitoring and temperature *** the case of similar substrates,we did not observe any difference between temperature sensitivity coefficients of the temperature compensation FBG with one free end or two free *** curves of the force along with temperature were almost overlapped with minor differences(less than 1%)gained by FBG sensors and pressure sensors,which verified the accuracy of the temperature compensation *** suggest that this work can provide efficient solutions to the strain-temperature cross-sensitivity for engineering strain monitoring with the self-sensing element embedded with FBG sensors.

关键词： FBG sensor self-sensing element embedded FBG sensor cross sensitivity of strain and temperature temperature compensation