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Energy & Environmental Materials 2024年第4期7卷 83-92页

作者： Chuan Zhou Xixi Wang Dongliang Liu Meijuan Fei Jie Dai Daqin Guan Zhiwei Hu Linjuan Zhang Yu Wang Wei Wang Ryan O'Hayre San Ping Jiang Wei Zhou Meilin Liu Zongping Shao State Key Laboratory of Materials-Oriented Chemical engineering College of Chemical Engineering Nanjing Tech University Max Planck Institute for Chemical physics of Solids Key Laboratory of Interfacial physics and Technology Shanghai Institute of Applied Physics Chinese Academy of Sciences Department of Metallurgical and Materials engineering Colorado School of Mines WA School of Mines: Minerals Energy and Chemical Engineering (WASM-MECE) Curtin University Suzhou Laboratory School of Materials Science and engineering Georgia Institute of Technology

For protonic ceramic fuel cells,it is key to develop material with high intrinsic activity for oxygen activation and bulk proton conductivity enabling water formation at entire electrode ***,a higher water content which benefitting for the increasing proton conductivity will not only dilute the oxygen in the gas,but also suppress the O2adsorption on the electrode surface.

关键词： cathode high-hydrating capability proton conductivity protonic ceramic fuel cells

Recursive Filtering for Stochastic Systems With Filter-and-Forward Successive Relays

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IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1202-1212页

作者： Hailong Tan Bo Shen Qi Li Hongjian Liu School of Mathematics-physics and Finance Anhui Polytechnic UniversityWuhu 241000China Anhui Future Technology Research Institute Anhui Polytechnic UniversityWuhu 241000China college of {1. Science and Technology Donghua UniversityShanghai 201620China engineering Research Center of Digitalized Textile and Fashion Technology Ministry of EducationShanghai 201620China School of information Science and {1. Hangzhou Normal UniversityHangzhou 311121China

In this paper,the recursive filtering problem is considered for stochastic systems over filter-and-forward successive relay(FFSR)*** FFSR is located between the sensor and the remote filter to forward the *** the successive relay,two cooperative relay nodes are adopted to forward the signals alternatively,thereby existing switching characteristics and inter-relay interferences(IRI).Since the filter-and-forward scheme is employed,the signal received by the relay is retransmitted after it passes through a linear *** objective of the paper is to concurrently design optimal recursive filters for FFSR and stochastic systems against switching characteristics and IRI of ***,a uniform measurement model is proposed by analyzing the transmission mechanism of ***,novel filter structures with switching parameters are constructed for both FFSR and stochastic *** the help of the inductive method,filtering error covariances are presented in the form of coupled difference ***,the desired filter gain matrices are further obtained by minimizing the trace of filtering error ***,the stability performance of the filtering algorithm is analyzed where the uniform bound is guaranteed on the filtering error ***,the effectiveness of the proposed filtering method over FFSR is verified by a three-order resistance-inductance-capacitance circuit system.

关键词： filtering successive stochastic

Synthesis-temperature-dependent phase composition manipulation toward high thermoelectric performance in tetrahedrites

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Journal of Materials Science & Technology 2024年第1期168卷 124-130页

作者： Yiqing Wei Jiaqi Liu Zien Cheng Pengfei Jiang Zizhen Zhou Bin Zhang Guoyu Wang Guang Han Xu Lu Xiaoyuan Zhou Center of Quantum Materials and Devices College of PhysicsChongqing UniversityChongqing 401331China college of Materials Science and {1. Chongqing UniversityChongqing 400044China college of Chemistry and Chemical {1. Chongqing UniversityChongqing 401331China Analytical and Testing Center Chongqing UniversityChongqing 401331China

Tetrahedrite,an Earth-abundant natural mineral,has attracted extensive research interest because of its excellent thermoelectric ***,tetrahedrite samples comprising Cu-poor Cu_(1.)Sb_(4)S_(1.)and Cu-rich Cu_(1.)Sb_(4)S_(1.)phases have been synthesized using a colloidal method,in which the ratio of two phases is manipulated by controlling the synthesis temperature to improve the thermoelectric *** is found that an ultralow total thermal conductivity of∼0.3 W m^(−1.K^(−1.at 723 K is realized in the sample with a Cu-rich phase fraction of∼50%,which can be attributed to maximized phonon scattering by phase *** a result,combined with a decent power factor,this sample obtains an optimal zT of 1.1.,which is about 85%higher than that of the sample with a Cu-rich phase fraction of∼64%and comparable to zT values of other eco-friendly,abundant Cu-based thermoelectric *** work demonstrates an effective synthesis-temperature-dependent phase composition manipulation strategy toward enhanced thermoelectric performance in tetrahedrites.

关键词： Tetrahedrite Thermoelectric Colloidal method Phase manipulation Thermal conductivity

Rational molecular engineering towards efficient heterojunction solar cells based on organic molecular acceptors

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Chinese physics B 2024年第6期33卷 575-587页

作者：张凯彦宋朋马凤才李源作 college of Materials Science and {1. Northeast Forestry UniversityHarbin 150040China college of Science Northeast Forestry UniversityHarbin 150040China Department of physics Liaoning UniversityShenyang 110036China

The selection of photoactive layer materials for organic solar cells(OSCs) is essential for the photoelectric conversion *** is well known that chlorophyll is an abundant pigment in nature and is extremely valuable for ***,there is little research on how to improve the efficiency of chlorophyll-based OSCs by matching chlorophyll derivatives with excellent non-fullerene acceptors to form *** in this study we utilize a chlorophyll derivative,Ce_(6)Me_(3),as a donor material and investigate the performance of its heterojunction with acceptor *** density functional theory,the photoelectric performances of acceptors,i ncluding the fullerene derivative PC_(71.BM and the terminal halogenated non-fullerene DTBCIC series,are compared in *** is found that DTBCIC-C1.has better planarity,light absorption,electron affinity,charge reorganization energy and charge mobility than ***_(6)Me_(3) has good energy level matching and absorption spectral complementarity with the investigated acceptor molecules and also shows good electron donor ***,the designed Ce_(6)Me_(3)/DTBCIC interfaces have improved charge separation and reorganization rates(K_(CS)/K_(CR)) compared with the Ce_(6)Me_(3)/PC_(71.BM *** research provides a theoretical basis for the design of photoactive layer materials for chlorophyll-based OSCs.

关键词： organic solar cells density functional theory chlorophyll derivative non-fullerene acceptors

Resonantly enhanced second-and third-harmonic generation in dielectric nonlinear metasurfaces

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Opto-Electronic Advances 2024年第5期7卷 5-19页

作者： Ji Tong Wang Pavel Tonkaev Kirill Koshelev Fangxing Lai Sergey Kruk Qinghai Song Yuri Kivshar Nicolae C.Panoiu Department of Electronic and Electrical engineering University College LondonLondon WC1E 7JEUnited Kingdom Nonlinear physics Center Research School of PhysicsAustralian National UniversityCanberra ACT 2601Australia Ministry of Industry and information Technology Key Lab of Micro-Nano Optoelectronic information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of TechnologyShenzhen 518055China Wuzhen Laboratory EGO Wuzhen Digital Economy Industrial ParkNo.925 Daole RoadTongxiangChina

Nonlinear dielectric metasurfaces provide a promising approach to control and manipulate frequency conversion optical processes at the nanoscale,thus facilitating both advances in fundamental research and the development of new practical applications in photonics,lasing,and ***,we employ symmetry-broken metasurfaces made of centrosymmetric amorphous silicon for resonantly enhanced second-and third-order nonlinear optical *** the rich physics of optical quasi-bound states in the continuum and guided mode resonances,we comprehensively study through rigorous numerical calculations the relative contribution of surface and bulk effects to second-harmonic generation(SHG)and the bulk contribution to third-harmonic generation(THG) from the ***,we experimentally achieve optical resonances with high quality factors,which greatly boosts light-matter interaction,resulting in about 550 times SHG enhancement and nearly 5000-fold increase of THG.A good agreement between theoretical predictions and experimental measurements is *** gain deeper insights into the physics of the investigated nonlinear optical processes,we further numerically study the relation between nonlinear emission and the structural asymmetry of the metasurface and reveal that the generated harmonic signals arising from linear sharp resonances are highly dependent on the asymmetry of the *** work suggests a fruitful strategy to enhance the harmonic generation and effectively control different orders of harmonics in all-dielectric metasurfaces,enabling the development of efficient active photonic nanodevices.

关键词： second-harmonic generation third-harmonic generation bound state in the continuum guided mode resonance all-dielectric metasurfaces nonlinear optics

Design of weak current measurement system and research on temperature impact

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Nuclear Science and Techniques 2024年第4期35卷 46-56页

作者： Chu-Xiang Zhao San-Gang Li Rong-Rong Su Li Yang Ming-Zhe Liu Qing-Yue Xue Shan Liao Zhi Zhou Qing-Shan Tan Xian-Guo Tuo Yi Cheng college of Nuclear Technology and Automation {1. Chengdu University of Technology1#DongsanluErxianqiaoChengdu 610059China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu University of Technology1#DongsanluErxianqiaoChengdu 610059China University of Science and Technology of China Hefei 230026China School of physics and Electronic {1. Sichuan University of Science and EngineeringZigong 643000China

A dedicated weak current measurement system was designed to measure the weak currents generated by the neutron ionization *** system incorporates a second-order low-pass filter circuit and the Kalman filtering algorithm to effectively filter out noise and minimize interference in the measurement *** conducted under normal temperature conditions has demonstrated the system's high precision ***,it was observed that temperature variations can affect the measurement *** were collected across temperatures ranging from -20 to 70℃,and a temperature correction model was established through linear regression fitting to address this *** feasibility of the temperature correction model was confirmed at temperatures of -5 and 40℃,where relative errors remained below 0.1. after applying the temperature *** research indicates that the designed measurement system exhibits excellent temperature adaptability and high precision,making it particularly suitable for measuring weak currents.

关键词： Weak current measurement system Neutron ionization chamber Kalman filter algorithm Temperature correction model

Chimera states of phase oscillator populations with nonlocal higher-order couplings

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Chinese physics B 2024年第4期33卷 402-407页

作者：伍勇刚余华健郑志刚徐灿 School of Mathematical Sciences Huaqiao UniversityQuanzhou 362021China Institute of Systems Science and college of {1. Science and engineering Huaqiao UniversityXiamen 361021China

The chimera states underlying many realistic dynamical processes have attracted ample attention in the area of dynamical ***, we generalize the Kuramoto model with nonlocal coupling incorporating higher-order interactions encoded with simplicial *** works have shown that higher-order interactions promote coherent ***, we uncover the fact that the introduced higher-order couplings can significantly enhance the emergence of the incoherent ***, we identify that the chimera states arise as a result of multi-attractors in dynamic ***, we review that the increasing higher-order interactions can significantly shape the emergent probability of chimera *** the observed results can be well described in terms of the dimension reduction *** study is a step forward in highlighting the importance of nonlocal higher-order couplings, which might provide control strategies for the occurrence of spatial-temporal patterns in networked systems.

关键词： synchronization complex system coupled oscillators phase transition

Recension of boron nitride phase diagram based on high-pressure and high-temperature experiments

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Chinese physics B 2024年第10期33卷 450-457页

作者： Ruike Zhang Ruiang Guo Qian Li Shuaiqi Li Haidong Long Duanwei He Institute of Atomic and Molecular physics Sichuan UniversityChengdu 610065China college of {1. and Electronic engineering Chongqing Normal UniversityChongqing 401331China Key Laboratory of High Energy Density physics and Technology of Ministry of Education Sichuan UniversityChengdu 610065China

Cubic boron nitride and hexagonal boron nitride are the two predominant crystalline structures of boron *** can interconvert under varying pressure and temperature ***,this transformation requires overcoming significant potential barriers in dynamics,which poses great difficulty in determining the c-BN/h-BN phase *** study used high-pressure in situ differential thermal measurements to ascertain the temperature of h-BN/c-BN conversion within the commonly used pressure range(3-6 GPa)for the industrial synthesis of c-BN to constrain the P-T phase boundary of h-BN/c-BN in the pressure-temperature range as much as *** on the analysis of the experimental data,it is determined that the relationship between pressure and temperature conforms to the following equation:P=a+1.***,P denotes the pressure(GPa)and T is the temperature(K).The coefficients are a=-3.8±0.8 GPa and b=229.8±1..1.GPa/*** findings call into question existing high-pressure and high-temperature phase diagrams of boron nitride,which seem to overstate the phase boundary temperature between c-BN and *** BN phase diagram obtained from this study can provide critical temperature and pressure condition guidance for the industrial synthesis of c-BN,thus optimizing synthesis efficiency and product performance.

关键词： hexagonal boron nitride phase diagram high temperature and high pressure cubic boron nitride phase transition differential thermal analysis

An Incentive Mechanism for Federated Learning:A Continuous Zero-Determinant Strategy Approach

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 88-102页

作者： Changbing Tang Baosen Yang Xiaodong Xie Guanrong Chen Mohammed A.A.Al-qaness Yang Liu IEEE the college of {1. and Electronic information engineering Zhejiang Normal UniversityUniversityJinhua 321004China the School of Mathematical Sciences Zhejiang Normal UniversityJinhua 321004China the Department of Electrical engineering City University of Hong KongHong KongChina Key Laboratory of Intelligent Education Technology and Application of Zhejiang Province Jinhua 321004China

As a representative emerging machine learning technique, federated learning(FL) has gained considerable popularity for its special feature of “making data available but not visible”. However, potential problems remain, including privacy breaches, imbalances in payment, and inequitable *** shortcomings let devices reluctantly contribute relevant data to, or even refuse to participate in FL. Therefore, in the application of FL, an important but also challenging issue is to motivate as many participants as possible to provide high-quality data to FL. In this paper, we propose an incentive mechanism for FL based on the continuous zero-determinant(CZD) strategies from the perspective of game theory. We first model the interaction between the server and the devices during the FL process as a continuous iterative game. We then apply the CZD strategies for two players and then multiple players to optimize the social welfare of FL, for which we prove that the server can keep social welfare at a high and stable level. Subsequently, we design an incentive mechanism based on the CZD strategies to attract devices to contribute all of their high-accuracy data to ***, we perform simulations to demonstrate that our proposed CZD-based incentive mechanism can indeed generate high and stable social welfare in FL.

关键词： Federated learning(FL) game theory incentive mechanism machine learning zero-determinant strategy

Enhancing the Goos–H?nchen shift based on quasi-bound states in the continuum through material asymmetric dielectric compound gratings

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Chinese physics B 2024年第3期 451-458页

作者：江孝伟方彬占春连 college of Optical and Electronic Technology China Jiliang University college of {1. engineering Quzhou College of Technology

Quasi-bound state in the continuum(QBIC) resonance is gradually attracting attention and being applied in Goos–H?nchen(GH) shift enhancement due to its high quality(Q) factor and superior optical confinement. Currently, symmetryprotected QBIC resonance is often achieved by breaking the geometric symmetry, but few cases are achieved by breaking the material symmetry. This paper proposes a dielectric compound grating to achieve a high Q factor and high-reflection symmetry-protectede QBIC resonance based on material asymmetry. Theoretical calculations show that the symmetryprotected QBIC resonance achieved by material asymmetry can significantly increase the GH shift up to-980 times the resonance wavelength, and the maximum GH shift is located at the reflection peak with unity reflectance. This paper provides a theoretical basis for designing and fabricating high-performance GH shift tunable metasurfaces/dielectric gratings in the future.

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