检索结果-南通市图书馆

Particle Filter and Its Application in the Integrated Train Speed Measurement

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2019年第1期24卷 130-136页

作者： ZHANG Liang BAO Qilian CUI Ke JIANG Yaodong XU Haigui DU Yuding Department of instrument Science and engineering School of Electronic Information and Electrical EngineeringShanghai Jiao Tong University Shanghai engineering research center for Intelligent Diagnosis and Treatment instrument Xichang Satellite Launch center Department of research and Development CASCO Signal Ltd.

Particle filter(PF) can solve the problem of state estimation under strong non-linear non-Gaussian noise condition with respect to traditional Kalman filter(KF) and those improved KFs such as extended KF(EKF) and unscented KF(UKF). However, problems such as particle depletion and particle degradation affect the performance of PF. Optimizing the particle set to high likelihood region with intelligent optimization algorithm results in a more reasonable distribution of the sampling particles and more accurate state estimation. In this paper, a novel bird swarm algorithm based PF(BSAPF) is presented. Firstly, different behavior models are established by emulating the predation, flight, vigilance and follower behavior of the birds. Then, the observation information is introduced into the optimization process of the proposal distribution with the design of fitness function. In order to prevent particles from getting premature(being stuck into local optimum) and increase the diversity of particles, Lévy flight is designed to increase the randomness of particle's movement. Finally,the proposed algorithm is applied to estimate the speed of the train under the condition that the measurement noise of the wheel sensor is non-Gaussian distribution. Simulation study and experimental results both show that BSAPF is more accurate and has more effective particle number as compared with PF and UKF, demonstrating the promising performance of the method.

关键词： particle filter(PF) bird swarm algorithm fitness function Lévy flight proposal distribution integrated train speed measurement

Pulse-doubling perovskite nanowire lasers enabled by phonon-assisted multistep energy funneling

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第8期13卷 1645-1654页

作者： Chunhu Zhao Jia Guo Jiahua Tao Junhao Chu Shaoqiang Chen Guichuan Xing Hunan Provincial Key Laboratory of Carbon Neutrality and Intelligent Energy School of Resource&EnvironmentHunan University of Technology and Business410205 ChangshaChina engineering research center for nanophotonics and advanced instrument Ministry of EducationSchool of Physics and Electronic ScienceEast China Normal University200241 ShanghaiChina Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of Macao999078 MacaoChina

Laser pulse multiplication from an optical gain medium has shown great potential in miniaturizing integrated optoelectronic *** multiple quantum wells(MQWs)structures have recently been recognized as an effective gain media capable of doubling laser pulses that do not rely on external optical *** the light amplifications enabled with pulse doubling are reported based on the perovskite MQWs thin films,the micronanolasers possessed a specific cavity for laser pulse multiplication and their corresponding intrinsic laser dynamics are still ***,a single-mode double-pulsed nanolaser from self-assembled perovskite MQWs nanowires is realized,exhibiting a pulse duration of 28 ps and pulse interval of 22 ps based on single femtosecond laser pulse *** is established that the continuous energy building up within a certain timescale is essential for the multiple population inversion in the gain medium,which arises from the slowing carrier localization process owning to the stronger exciton–phonon coupling in the smaller-n ***,the double-pulsed lasing is achieved from one fast energy funnel process from the adjacent small-n QWs to gain active region and another slow process from the spatially separated *** report may shed new light on the intrinsic energy relaxation mechanism and boost the further development of perovskite multiple-pulse lasers.

关键词： doubling energy phonon

Boosted Lithium-Ion Transport Kinetics in n-Type Siloxene Anodes Enabled by Selective Nucleophilic Substitution of Phosphorus

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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 being 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 mean 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 herein 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

Influence of the Hole Chamfer on the Characteristics of a Multi-hole Orifice Flowmeter

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2019年第4期15卷 391-401页

作者： Caizhe Hao Xiaoming Song Zhining Jia Chengde Petroleum College Hebei Instrument&Meter Engineering Technology Research CenterHebei Instrument&Meter Industry Technology Research InstituteChengde067000China

In order to analyze the influence of the hole chamfer on the metering performances of a Multi-hole Orifice Flowmeter and optimize the related orifice structure,a multi-hole orifice flowmeter with DN80 and throttle ratio of 0.45 was considered in the present *** flow field characteristics were determined in the framework of a CFD *** results show that the multi-hole orifice flowmeter with filleting transition around the throttle orifice has higher accuracy in a wide range of the space of parameters,and is more suitable for accurate measurement of fluid in process control.

关键词： Multi-hole orifice differential pressure chamfer CFD simulation

Tunable negative-index photonic crystals using colloidal magnetic fluids

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第12期24卷 352-357页

作者：耿滔王新王岩董祥美 engineering research center of Optical instrument and System Ministry of Education Shanghai Key Laboratory of Modern Optical SystemUniversity of Shanghai for Science and Technology

The model of using colloidal magnetic fluid to build tunable negative-index photonic crystal is established. The effective permittivity εe and permeability μe of the two-dimensional photonic crystal are investigated in detail. For transverse magnetic polarization, both εe and μe exhibit a Lorentz-type anomalous dispersion, leading to a region where εe and μe are simultaneously negative. Then, considering a practical case, in which the thickness of photonic crystal is finite, the band structures for odd modes are calculated by the plane wave expansion method and the finite-difference time-domain method. The results suggest that reducing the external magnetic field strength or slab thickness will weaken the periodic modulation strength of the photonic crystal. Simulation results prove that the negative-index can be tuned by varying the external magnetic field strength or the slab thickness. The work presented in this paper gives a guideline for realizing the flat photonic crystal lens with tunable properties at optical frequencies, which may have potential applications in tunable near-field imaging systems.

关键词： tunable negative-index photonic crystals colloidal magnetic fluids

Hybrid supraparticles of carbon dots/porphyrin for multifunctional tongue-mimic sensors

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第5期33卷 2715-2720页

作者： Rong Hu Xingchun Zhai Yubin Ding Guoyue Shi Min Zhang School of Chemistry and Molecular engineering Shanghai Key Laboratory for Urban Ecological Processes and Eco-RestorationShanghai Key Laboratory of Multidimensional Information ProcessingEngineering Research Centre for Nanophotonics and Advanced Instrument(Ministry of Education)East China Normal UniversityShanghai 200241China Department of Chemistry College of SciencesNanjing Agricultural UniversityNanjing 210095China

Supraparticles(SPs),such as assembly of inorganic components with organic,have made tremendous attention in biochemical analysis,which represents a novel but challenging research ***,a single-SPs multifunctional fluorescent sensor array has been developed for high-throughput detection of heavy metal ions in biofluids,which is based on an inorganic/organic hybrid SPs consisting of carbon dots(CDs)and an easily available porphyrin[5,10,15,20-tetra(4-carboxyphenyl)porphyrin(TCPP)].TCPP can aggregate with the CDs to form the assembly(CDs/TCPP SPs)through the electrostatic andπ-πstacking *** are two independent and clearly separated fluorescence emission peaks at 470 and 668 nm in the resultant CDs/TCPP SPs under 380 nm *** a proof-of concept design,F 470,F 668,F 668/F 470 of SPs are chosen as three sensor components to constitute our sensor *** the addi-tion of metal ions,three sensor components can generate different fluorescence response patterns for discriminating 11 heavy metal ions via principal component analysis(PCA).Additionally,thiols can read-ily capture Cu^(2+)to switch the fluorescence of CDs/TCPP initially altered by Cu^(2+).Hence,CDs/TCPP-Cu^(2+)ensemble is further demonstrated to be a powerful sensor array for pattern recognition of 7 thiols and even chiral recognition of cysteine *** novel strategy avoids the tanglesome synthesis of multiple sensing probes and dedicates an innovative method for the facile establishment of tongue-mimic sensors,which would prospectively sprout more homologous assumptions to broaden its application toward more biosensing fields.

关键词： Supraparticles Carbon dots Porphyrin Pattern recognition sensor array Heavy metal ions Thiols

Asymmetric magnetoimpedance effect and dipolar interactions of FINEMET/SiO_(2)/FePd composite ribbons

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2023年第7期32卷 347-352页

作者：郭永斌王岛王忠民马垒赵振杰 Key Laboratory of UWB&THz of Shandong Academy of Sciences Institute of AutomationQilu University of Technology(Shandong Academy of Sciences)Jinan 250014China College of Science Qiongtai Normal UniversityHaikou 571127China School of Materials Science and engineering Guilin University of Electronic TechnologyGuilin 541004China engineering research center for nanophotonics and advanced instrument School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China

The dipolar interactions are investigated through the asymmetric magneto-impedance in FINEMET/SiO_(2)/FePd composite *** interface between the hard(FePd layer)phase and soft(FINEMET ribbon)phase is coherent by SiO_(2)layer in FINEMET/SiO_(2)/FePd composite ribbons,which effectively induces dipolar *** contribution of dipolar interaction to the bias field(Hb)by asymmetrical giant magneto-impedance and magnetic properties is *** results show that Hb response decreases with the increase of the SiO_(2)layer thickness,indicating that the linear region near-zero field can be tuned by the thickness of SiO_(2)*** results allow the GMI ratio(58%)and characteristic frequency(500 kHz)to be *** transverse and longitudinal magnetic domain structures of FINEMET ribbon and FePd film are confirmed,*** composite ribbons with high GMI ratio and low frequency can be applied to linear magnetic sensors.

关键词： asymmetric giant magnetoimpedance FePd film composite ribbons

A Review on Metal-and Metal Oxide-Based Nanozymes:Properties,Mechanisms,and Applications

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2021年第10期13卷 147-199页

作者： Qianwen Liu Amin Zhang Ruhao Wang Qian Zhang Daxiang Cui Institute of Nano Biomedicine and engineering Shanghai Engineering Research Center for Intelligent Diagnosis and Treatment InstrumentDepartment of Instrument Science and EngineeringSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong University800 Dongchuan RDShanghai 200240People’s Republic of China Institute of Nano Biomedicine National Engineering Research Center for Nanotechnology28 Jiangchuan EasternroadShanghai 200241People’s Republic of China

Since the ferromagnetic(Fe_(3)O_(4))nanoparticles were firstly reported to exert enzyme-like activity in 2007,extensive research progress in nanozymes has been made with deep investigation of diverse nanozymes and rapid development of related *** promising alterna-tives for natural enzymes,nanozymes have broadened the way toward clinical medicine,food safety,environmental monitoring,and chemical *** past decade has witnessed the rapid development of metal-and metal oxide-based nanozymes owing to their remarkable physicochemical proper-ties in parallel with low cost,high stability,and easy *** is widely known that the deep study of catalytic activities and mechanism sheds sig-nificant influence on the applications of *** review digs into the characteristics and intrinsic properties of metal-and metal oxide-based nanozymes,especially emphasizing their catalytic mechanism and recent applications in biological analysis,relieving inflammation,antibacterial,and cancer *** also conclude the present challenges and provide insights into the future research of nanozymes constituted of metal and metal oxide nanomaterials.

关键词： Metal-and metal oxide-based nanozymes Intrinsic properties Catalytic mechanism Applications

Non-Hermitian polarization quantized by time-reversal symmetry

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 141-147页

作者： Jing Cheng Jinbing Hu Zhigao Hu Lin Chen Minghui Lu Songlin Zhuang Technical center for Multifunctional Magneto-Optical Spectroscopy(Shanghai) Engineering Research Center of Nanophotonics&Advanced Instrument(Ministry of Education)Department of Physics and Electronic ScienceEast of China Normal UniversityShanghai200241China College of Optical-Electrical Information and Computer engineering University of Shanghai for Science and TechnologyShanghai200093China Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan430074China National Laboratory of Solid State Microstructures Science and engineering Nanjing UniversityNanjing210093China

It is well known that in one-dimensional(1D) crystalline insulators,the electric polarization is a manifestation of Berry phase,which can not be quantized by time-reversal symmetry(TRS) as in Hermitian physics TRS does not induce any topological phase in one *** this paper we report that even though associated with complex eigenenergies a 1D non-Hermitian insulator obeying only TRS is capable of presenting quantized bulk *** underlying physical reason is unveiled:TRS guarantees the complex energies to come in pair(E,E*),and the corresponding decaying and amplifying wave functions also come in pair and have the same variation rate,hence,giving rise to a stable wannier *** electron transport is performed by means of charge pumping process,which verifies the physical mechanism *** last,we discuss the possible experimental implementation of the proposed model by means of twisted-π gauge flux.

关键词： non-Hermitian polarization time-reversal symmetry complex hopping