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Organic topological insulators(OTI): a dream coming true?

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National Science Review 2020年第6期7卷 996-997页

作者： Danfeng Zhi chong-an di Daoben Zhu Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences

Topological insulators (TIs) are a class of materials with insulating bulk states but exotic metallic states on their surfaces [1]. Benefiting from topological boundary states, TIs have become one of the most important topics in condensed materials, not only because they offer a unique perspective for revealing the origin of various quantum phases, but also because of their potential applications in spintronics and quantum com-

关键词： Electric insulators

Analysis of Vibration and Noise of Induction Motor Equipped with Concentric Single-Double-Layer Star-Delta Winding

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Chinese Journal of Electrical Engineering 2019年第1期5卷 36-46页

作者： Zechen Li chong di Xiaohua Bao Hefei University of Technology School of Electrical Engineering and AutomationHefei 230009China Department of Electrical Engineering LUT School of Energy SystemsLappeenranta University of TechnologyLappeenranta 53851Finland

Compared with changing the structure of a motor that has been manufactured,changing the type of stator winding is an economical and time-saving method to reduce the vibration and ***,a concentric single-double-layer star-delta(CSDLSD)winding for an induction motor is described in this paper with the aim of reducing the noise of the *** planning the turns relationship between the two parts of the winding,the harmonic component of the air-gap magnetic field can be *** this,through adjusting the turns ratio in each slot of concentric winding per phase respectively,the waveform of the air-gap magnetic field becomes closer to a sinusoidal *** motors equipped with the CSDLSD winding and another two types of stator winding were *** theoretical analysis and the two-dimensional finite element method(2D-FEM)were combined to study the relationship between the harmonics of the air-gap magnetic field and the stator ***,a 2D fast Fourier transformation(2D-FFT)method was used to obtain the time-frequency spectrum of the air-gap flux density and electromagnetic excitation force,and compared with a natural vibration *** noise distribution was obtained using the harmonic *** results of the theoretical analysis,2D-FEM,2D-FFT,and harmonic response corroborate each other such that the motor applying CSDLSD winding could reduce both the vibration and noise.

关键词： Induction motor concentric single-double-layer star-delta winding 2D-FFT vibration

Organic thermoelectrics for green energy

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National Science Review 2016年第3期3卷 269-271页

作者： chong-an di Wei Xu Daoben Zhu Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of Sciences

INTRODUCTION Driven by the increasing demand for electricity,a burning desire in scientific fields is to harvest electricity from renewable energy using a green *** materials can meet this requirement because their h... 详细信息

关键词： PEDOT Organic thermoelectrics for green energy ZT flexible

Advances in theoretical calculations of organic thermoelectric materials

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Chinese Chemical Letters 2024年第8期35卷 112-127页

作者： Shaohua Zhang Liyao Liu Yingqiao Ma chong-an di Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

Organic thermoelectric(OTE)materials and devices have garnered significant attention in the past decade for flexible and wearable *** to the numerous combinations of different backbones,side chains,and functional groups for polymer molecules,further efficient developments of high perfor-mance OTEs rely on reverse and rational molecular design as well as fundamental understanding to the structure-property relationship,which both require precise theoretical ***,many theo-retical efforts and progresses have been made to predict TE properties and develop high performance OTE ***,we present first the general methods and principles for OTE theoretical ***,the latest theoretical advances regarding the effects of molecular design,chemical dop-ing,ambipolar charge transport etc.,to TE conversion are carefully *** theoretical advances not only significantly deepen the fundamental understanding of OTEs,but also provide precise guidance to the molecular design of OTE ***,we propose several perspectives for future theoretical investigations of OTEs.

关键词： Organic thermoelectricity Theoretical study Organic semiconductor Structure-property relation Single-molecular device

Electronic structure engineering in organic thermoelectric materials

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Journal of Energy Chemistry 2021年第11期30卷 204-219,I0005页

作者： Xiaojuan Dai Qing Meng Fengjiao Zhang Ye Zou chong-an di Daoben Zhu Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

Electronic structures, which play a key role in determining electrical and optical properties of π-conjugated organic materials, have attracted tremendous interest. Efficient thermoelectric (TE) conversion of organic materials has rigorous requirements on electronic structures. Recently, the rational design and precise modulation of electronic structures have exhibited great potential in exploring state-of-the-art organic TE materials. This review focuses on the regulation of electronic structures of organic materials toward efficient TE conversion. First, we present the basic knowledge regarding electronic structures and the requirements for efficient TE conversion of organic materials, followed by a brief introduction of commonly used methods for electronic structure characterization. Next, we highlight the key strategies of electronic structure engineering for high-performance organic TE materials. Finally, an overview of the electronic structure engineering of organic TE materials, along with current challenges and future research directions, are provided.

关键词： Organic thermoelectric materials Electronic structure Organic semiconductors

Bearing Fault Numerical Model for the Closed-slot Rotor Submersible Motor

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Chinese Journal of Electrical Engineering 2023年第2期9卷 84-93页

作者： Zhe Ke Bokai Guan chong di Jingwen Yan Xiaohua Bao School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China School of Electrical and Computer Engineering The Ohio State UniversityColumbus OH 43210USA

A numerical model of the bearing fault of a motor with a closed-slot rotor using the finite element method(FEM)is *** rotor’s radial motion can be regarded as static eccentric at the defect time points and healthy at other time *** frequency of the harmonic component is analyzed corresponding to bearing fault in stator current according to the radial movement of the motor ***,the relative permeability variation region is established to achieve the radial motion of the rotor with bearing ***,the relative permeability variation region is established in the health and static eccentric ***,the defect time points are estimated and the static eccentricity model by transient field is ***,the relative permeability of the variable region in the static eccentric model is imported into the variable region of the health model at the defect time *** simulation results show that the air gap flux density of the bearing fault model is different from that of the health model and static eccentric *** addition,the stator current contains harmonic components of the bearing *** analysis results prove the applicability of the proposed model.

关键词： Bearing fault finite element method relative permeability variation region closed-slot rotor stator current

High-performance and multifunctional organic field-effect transistors

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Chinese Chemical Letters 2023年第9期34卷 100-118页

作者： Yujie Zhao Wei Wang Zihan He Boyu Peng chong-An di Hanying Li MOE Key Laboratory of Macromolecular Synthesis and Functionalization International Research Center for X PolymersDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

Organic field-effect transistors(OFETs)refer to field-effect transistors that use organic semiconductors as channel *** to the advantages of organic materials such as solution processability and intrinsic flexibility,OFETs are expected to be applicable in emergent technologies including wearable electronics and sensors,flexible displays,internet-of-things,neuromorphic computing,*** the electrical performance and developing multifunctionalities of OFETs are two major and closely relevant aspects for OFETs-related *** former one aims for investigating the device physics and expanding the horizons of OFETs,while the later one is critical for leading OFETs into practical and emergent *** development in each of the two aspects would undoubtfully promote the other and bring more confidence for future development of ***,this review is divided into two parts that respectively summarize the recent progress in high-performance OFETs and multifunctional OFETs.

关键词： Organic filed-effect transistors Organic semiconductors High-performance Multifunctionality Organic electronics

Advances in organic thermoelectric materials and devices for smart applications

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SmartMat 2021年第4期2卷 426-445页

作者： Yue Zhao Liyao Liu Fengjiao Zhang chong‐an di Daoben Zhu School of Chemical Science University of Chinese Academy of SciencesBeijingChina Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijingChina

Organic thermoelectric(OTE)materials have been considered to be promising candidates for large area and low‐cost wearable devices owing to their tailorable molecular structure,intrinsic flexibility,and prominent solution *** importantly,OTE materials offer direct energy conversion from the human body,solid‐state cooling at low electric consumption,and diversified ***,we summarize recent developments of OTE materials and devices for smart *** first review the fundamentals of OTE materials from the viewpoint of thermoelectric performance,mechanical properties and bionic ***,we describe OTE devices in flexible generators,photothermoelectric detectors,self‐powered sensors,and ultra‐thin cooling ***,we present the challenges and perspectives on OTE materials as well as devices in wearable electronics and fascinating applications in the Internet of Things.

关键词： flexible generators organic thermoelectric materials self‐powered sensors smart electronics thin‐film cooling

A Design Method of the Rotor Auxiliary Slot for the Water-filled Submersible Induction Motors

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CES Transactions on Electrical Machines and Systems 2022年第1期6卷 37-45页

作者： Jiaxin Li Jingwen Yan chong di Xiaohua Bao Qinglong Zhu School of Electrical Engineering and Automation Hefei University of TechnologyHefei230009 China IEEE Hefei Hengda Jianghai Pump Co. LtdHefei230000 China

Aiming at the problem of electromagnetic vibration of the water-filled submersible induction motor(WSIM),a method of opening auxiliary slots on the rotor side is proposed to weaken the air-gap field harmonics caused by the rotor slot permeance *** analyzing the research status of electromagnetic vibration of the WSIM and the composition of the air-gap magnetic field of the motor,the idea that the auxiliary slots mainly affect the air-gap field harmonics by changing the air-gap permeance of the motor is put *** mathematical model of air-gap permeance of WSIM is established to simulate the influence of auxiliary slots on the air-gap *** the parametric analysis of the mathematical model,the change of auxiliary slot size is *** air-gap permeance waveform is decomposed by the two-dimensional Fourier transform,and then the variation of the air-gap permeance harmonics with the size of the auxiliary slot is ***,the finite element simulation model of the WSIM with the auxiliary slots is established,and the waveform of the air-gap flux density of the motor is analyzed to verify the effectiveness of the mathematical ***,the results show that after opening the auxiliary slot,the radial electromagnetic force of the motor was reduced by 28.4%.

关键词： Auxiliary slot the radial electromagnetic force the Water-filled Submersible Induction Motors