Research on Causal Model Construction and Fault Diagnosis of Control Systems
作者：
Zhu Q.;Chen Z.;Liu J.;Xu Z.;Wen J.;...
作者机构：
School of Computer Science, University of South China, Hengyang, 421200, China;Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610064, China;School of Electrical Engineering, University of South China, Hengyang, 421200, China
会议名称：
7th International Conference on Computing, Control and Industrial Engineering, CCIE 2023
会议时间：
25 February 2023 through 26 February 2023
关键词：
Control systems;Data flow analysis;Fault detection;Flow graphs;Nuclear fuels;Nuclear power plants;Causal graph;Causal graph model;Causal modeling;Complex control systems;Control equations;Faults diagnosis;Graph model;Hot topics;Information flows;Model construction;Failure analysis
摘要：
Fault diagnosis of complex control systems is a difficult and hot topic of research at this stage. In order to explore the internal operation characteristics of complex control systems and fault propagation methods to achieve efficient and accurate fault diagnosis, this paper studies control system fault diagnosis methods based on cause-effect relationships, analyzes the role relationship between system components from the perspective of control equation structure, proposes the method of constructing cause-effect diagram models with control equations, and uses the algorithm of way to implement, and then combine the information flow to quantify the causal effect quantifiably, when the system steady state is disrupted, the information flow produces a jump, so as to extend the fault diagnosis reasoning method. The fault diagnosis is verified by simulation of the pressure control system of the nuclear power plant regulator, and the experimental results verify the effectiveness of the proposed method. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
语种：
英文
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Correlation between geometric parametric instability sidebands in graded-index multimode fibers
作者：
Deng, Zhixiang;Chen, Yu;Liu, Jun* ;Zhao, Chujun;Fan, Dianyuan
期刊：
CHAOS ,2021年31(1):013109 ISSN：1054-1500
通讯作者：
Liu, Jun
作者机构：
[Deng, Zhixiang; Fan, Dianyuan; Chen, Yu; Liu, Jun] Shenzhen Univ, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst,Coll Optoelect E, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Shenzhen 518060, Peoples R China.;[Deng, Zhixiang] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Zhao, Chujun] Hunan Univ, Sch Phys & Elect, IFSA Collaborat Innovat Ctr, Minist Educ,Lab Micronanooptoelect Devices, Changsha 410082, Peoples R China.
通讯机构：
[Liu, Jun] S;Shenzhen Univ, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst,Coll Optoelect E, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Shenzhen 518060, Peoples R China.
摘要：
The spectral analysis of the light propagating in normally dispersive graded-index multimode fibers is performed under initial noisy conditions. Based on the obtained spectra with multiple simulations in the presence of noise, we investigate the correlation in energy between the well-separated spectral sidebands through both the scattergrams and the frequency-dependent energy correlation map and find that conjugate couples are highly correlated while cross-combinations exhibit a very poor degree of correlation. These results reveal that the geometric parametric instability processes associated with each sideband pair occur independently from each other, which can provide significant insights into the fundamental dynamical effect of the geometric parametric instability and facilitate the future implementation of high-efficiency photon pair sources with reduced Raman decorrelations.
语种：
英文
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Spatio-temporal control of dispersive waves trapping by solitons in graded-index multimode fibers
作者：
Deng, Zhixiang;Chen, Yu;Liu, Jun* ;Zhao, Chujun;Fan, Dianyuan
期刊：
APPLIED PHYSICS EXPRESS ,2020年13(11):112003 ISSN：1882-0778
通讯作者：
Liu, Jun
作者机构：
[Deng, Zhixiang; Fan, Dianyuan; Chen, Yu; Liu, Jun] Shenzhen Univ, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov,Coll Optoelect Engn, Shenzhen 518060, Peoples R China.;[Deng, Zhixiang] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Zhao, Chujun] Hunan Univ, Sch Phys & Elect, IFSA Collaborat Innovat Ctr, Lab Micro Nano Optoelect Devices,Minist Educ, Changsha 410082, Peoples R China.
通讯机构：
[Liu, Jun] S;Shenzhen Univ, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov,Coll Optoelect Engn, Shenzhen 518060, Peoples R China.
关键词：
soliton;supercontinuum;Raman;dispersive radiations;Spatio-temporal control
摘要：
We investigate the impact of the spatial beam oscillations in a graded-index multimode fiber (MMF) upon the trapping and blue-shifting of dispersive pulses by a multimode soliton. We find that the dispersive pulses trapped by solitons can be controlled through adjusting the degree of compression of the spatial beam. This can provide an explanation for the enhanced blue spectral extension observed in the typical supercontinuum generation in graded-index MMFs. Besides, the spatial-temporal nonlinear effect may provide an additional degree of freedom for the spectrally tailored light generation and the ultrashort pulse generation with tunable wavelengths in the normal dispersion regime. © 2020 Institute of Physics Publishing. All rights reserved.
语种：
英文
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A Novel Compensation Method for Eliminating Precession Angular-Rate Bias in MEMS Rate-Integrating Gyroscopes
作者：
Liu, Jing;Yang, Yinghui;Guo, Shuwen* ;Fan, Bo;Xuan, Lin;...
期刊：
IEEE ACCESS ,2020年8:145611-145619 ISSN：2169-3536
通讯作者：
Guo, Shuwen
作者机构：
[Yang, Yinghui; Xu, Dacheng; Liu, Jing; Fan, Bo; Guo, Shuwen; Xuan, Lin; Bu, Feng] Soochow Univ, Sch Elect & Informat Engn, Suzhou 251000, Peoples R China.;[Fan, Bo] South China Univ, Sch Elect Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Guo, Shuwen] S;Soochow Univ, Sch Elect & Informat Engn, Suzhou 251000, Peoples R China.
关键词：
Damping;Vibrations;Micromechanical devices;Force;Anisotropic magnetoresistance;Gyroscopes;Oscillators;MEMS rate-integrating gyro;asymmetric damping;asymmetric stiffness;threshold
摘要：
The structural asymmetry of the MEMS rate-integrating gyro (RIG) mode produces a threshold and an angle-dependent bias (ADB) that cause gyroscopes operating in this mode to stop working at input rates below the threshold and degrade the linearity of the output angle. This defect in the RIG output angle is actually caused by a precession angular-rate bias that results from both damping asymmetry (anisodamping) and stiffness asymmetry (anisostiffness). This paper describes a novel compensation method based on Fourier series fitting combined with a multiple iteration technique. The proposed compensation method can significantly reduce both the input rate threshold and ADB. Simulations indicate that the threshold and ADB caused by anisodamping and anisostiffness can be reduced by three orders of magnitude. An experimental application of this method produced a MEMS RIG threshold as low as 0.05° per second, representing an improvement of two orders of magnitude and lower than has previously been reported. © 2013 IEEE.
语种：
英文
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Emission of multiple resonant radiations by spatiotemporal oscillation of multimode dark pulses
作者：
Deng, Zhixiang;Chen, Yu;Liu, Jun* ;Zhao, Chujun;Fan, Dianyuan
期刊：
Optics Express ,2019年27(24):36022-36033 ISSN：1094-4087
通讯作者：
Liu, Jun
作者机构：
[Deng, Zhixiang; Fan, Dianyuan; Chen, Yu; Liu, Jun] Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst,Int Collaborat L, Shenzhen 518060, Guangdong, Peoples R China.;[Deng, Zhixiang] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Liu, Jun] Aston Univ, Sch Engn & Appl Sci, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England.;[Zhao, Chujun] Hunan Univ, Sch Phys & Elect, IFSA Collaborat Innovat Ctr, Minist Educ,Lab Micro Nano Optoelect Devices, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Liu, Jun] S;[Liu, Jun] A;Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst,Int Collaborat L, Shenzhen 518060, Guangdong, Peoples R China.;Aston Univ, Sch Engn & Appl Sci, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England.
关键词：
Dispersion (waves);Nonlinear optics;Phase matching;Solitons;Anomalous dispersion;Graded-Index Multimode fibers;Multi-mode waveguides;Non-linear parameters;Nonlinear interactions;Periodic oscillation;Quasi phase matching;Spatio-temporal oscillations;Multimode fibers;article;excitation;oscillation
摘要：
In this paper, we illustrate how the periodically modulated nonlinear parameter induced by the spatial beam oscillation can be used to generate broadband resonant radiations, through a train of dark pulses in normally dispersive graded-index multimode fibers under the efficient quasi-phase-matching schemes. More precisely, we demonstrate that two co-propagating waves with equal intensities and certain temporal delays can induce the formation of a train of dark solitons, with each emitting multiple resonant radiation lines, which can possibly form multiple radiation continuums based on vast amount of excited dark solitons. The nonlinear-interaction-aided excitation of dark pulses and their radiations appear to occur through a deterministic pathway, in sharp contrast to the situation for bright pulses in the anomalous dispersion region. The quasi-phase-matching condition via periodic oscillation of spatial beam in the normal-dispersion regime adds a unique dimension to the physical design of multimode waveguides, allowing the spectrum to be engineered for specific applications. © 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
语种：
英文
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Graded-index breathing solitons from Airy pulses in multimode fibers
作者：
Deng, Zhixiang;Chen, Yu;Liu, Jun* ;Zhao, Chujun;Fan, Dianyuan
期刊：
Optics Express ,2019年27(2):483-493 ISSN：1094-4087
通讯作者：
Liu, Jun
作者机构：
[Deng, Zhixiang; Fan, Dianyuan; Chen, Yu; Liu, Jun] Shenzhen Univ, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov,Coll Optoelect Engn, Shenzhen 518060, Peoples R China.;[Deng, Zhixiang] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Liu, Jun] Aston Univ, Aston Inst Photon Technol, Sch Engn & Appl Sci, Birmingham B4 7ET, W Midlands, England.;[Zhao, Chujun] Hunan Univ, Lab Micro Nano Optoelect Devices, Minist Educ, IFSA Collaborat Innovat Ctr,Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Liu, Jun] S;[Liu, Jun] A;Shenzhen Univ, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov,Coll Optoelect Engn, Shenzhen 518060, Peoples R China.;Aston Univ, Aston Inst Photon Technol, Sch Engn & Appl Sci, Birmingham B4 7ET, W Midlands, England.
关键词：
Dispersion (waves);Fibers;Nonlinear equations;Solitons;Breathing solitons;Extreme wave events;Localized structures;Localized wave packets;Non-linear parameters;Nonlinear dispersive;Periodic evolution;Self-imaging effects;Multimode fibers
摘要：
Breathing solitons, as localized wave packets with a periodic evolution in amplitude and duration, are able to model extreme wave events in complex nonlinear dispersive systems. We have numerically studied the formation and manipulation of graded-index breathing solitons embedded in nonlinear multimode fibers based on a single nonlinear Schrödinger equation that includes the spatial self-imaging effect through a periodically varying nonlinear parameter. Through changing specific parameters of the input optical field, we can manipulate the period and depth of graded-index breathing soliton dynamics under different relative strengths between the dispersion length and the self-imaging period of the multimode fiber. Our study can explicitly derive a robust mechanism to control the behavior of the breathing localized structure directly and contribute to a better understanding of the much more complex nonlinear graded-index soliton dynamics in multimode fibers. © 2019 Optical Society of America.
语种：
英文
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Effects of the different interlayer deposition processes on the microstructure of Cr/tiN coating
作者：
Guan, Wangwang;Zhu, Hongmei* ;Zhu, Weihua;Chen, Zhiyong;Liu, Jinjing;...
期刊：
Materials Research Express ,2019年6(12):126444 ISSN：2053-1591
通讯作者：
Zhu, Hongmei;Wang, Xinlin
作者机构：
[Shi, Xinling; Guan, Wangwang; Wang, Xinlin; Liu, Jinjing; Zhu, Hongmei; Zhu, HM; Wang, XL] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;[Zhu, Weihua; Wang, Xinlin; Chen, Zhiyong] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Shi, Xinling; Zhu, Weihua; Wang, Xinlin; Liu, Jinjing] Hunan Prov Key Lab Ultrafast Micro Nano Technol &, Hengyang 421001, Peoples R China.
通讯机构：
[Zhu, HM; Wang, XL; Wang, Xinlin] U;[Wang, Xinlin] H;Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.;Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;Hunan Prov Key Lab Ultrafast Micro Nano Technol &, Hengyang 421001, Peoples R China.
关键词：
Ion implantation;Magnetron sputtering;Microstructure;Oxidation resistance;Physical vapor deposition;Surface roughness;Thermooxidation;Zircaloy;Bonding interfaces;Deposition process;Morphological features;Multiarc ion plating;Phase constituent;Surface particles;Surface porosity;Zircaloy-4;Coatings
摘要：
Cr/TiN coatings were deposited on the surface of Zircaloy-4 alloy by physical vapor deposition. The Cr interlayers were prepared by magnetron sputtering (MS) and multi-arc ion plating (MAIP), respectively. To elucidate the effects of the different interlayer processes on the microstructure of Cr/TiN coating, the morphological features, components of surface particles, surface roughness, bonding strength, phase constituents, and high-temperature oxidation resistance were carefully investigated. In comparison to the Cr/TiN coating with the Cr interlayer prepared by the MS, the Cr/TiN coating with the Cr interlayer prepared by the MAIP exhibits a blurry bonding interface and higher coating roughness. Interestingly, the latter one has lower surface porosity, together with better adhesion and higher oxidation resistance. © 2020 IOP Publishing Ltd.
语种：
英文
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基于工程教育专业认证的师资队伍建设实践
作者：
郭玮;李月华;刘珺
期刊：
教育现代化 ,2018年5(47):121-122 ISSN：2095-8420
作者机构：
南华大学 电气工程学院,湖南 衡阳,421001;[郭玮; 李月华; 刘珺] 南华大学
关键词：
工程教育专业认证;师资队伍建设;认证标准
摘要：
根据中国工程教育专业认证标准对电子信息工程专业师资队伍建设进行了实践研究。从学生指导活动、教师参与指导的措施及取得的成效三方面对标准要求的达成进行探讨。本研究为高等工程教育改革及其它院校工科专业参与专业认证提供重要参考。
语种：
中文
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Dark solitons manipulation using optical event horizon
作者：
Deng, Zhixiang;Liu, Jun* ;Huang, Xianwei;Zhao, Chujun;Wang, Xinlin
期刊：
Optics Express ,2018年26(13):16535-16546 ISSN：1094-4087
通讯作者：
Liu, Jun
作者机构：
[Deng, Zhixiang; Wang, Xinlin] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Liu, Jun] Shenzhen Univ, Int Collaborat Lab Mat Optoelect Sci & Technol 2D, Coll Optoelect Engn, Key Lab Optoelect Devices & Syst,Minist Educ & Gu, Shenzhen 518060, Peoples R China.;[Liu, Jun] Aston Univ, Aston Inst Photon Technol, Sch Engn & Appl Sci, Birmingham B4 7ET, W Midlands, England.;[Huang, Xianwei] Hunan Univ, Coll Comp Sci & Elect Engn, Changsha 410082, Hunan, Peoples R China.;[Zhao, Chujun] Hunan Univ, Sch Phys & Elect, IFSA Collaborat Innovat Ctr, Lab Micro Nanooptoelect Devices,Minist Educ, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Liu, Jun] S;[Liu, Jun] A;Shenzhen Univ, Int Collaborat Lab Mat Optoelect Sci & Technol 2D, Coll Optoelect Engn, Key Lab Optoelect Devices & Syst,Minist Educ & Gu, Shenzhen 518060, Peoples R China.;Aston Univ, Aston Inst Photon Technol, Sch Engn & Appl Sci, Birmingham B4 7ET, W Midlands, England.
关键词：
Linear stability analysis;Probes;Stars;Adiabatic variation;Collisional dynamics;Event horizon;Integrable systems;Intrinsic mechanisms;Nonlinear interactions;Power adjustments;Propagation properties;Solitons;adiabaticity;article;black hole;velocity
摘要：
We demonstrate that the optical event horizon can provide an effective technique to actively control the propagation properties of a dark soliton with another weak probe wave. Careful power adjustment of the probe wave enables the black soliton converted into a gray one with varying grayness through the nonlinear interaction, corresponding to a nearly adiabatic variation of the soliton’s speed. The sign of the phase angle for the newly formed gray soliton at optical event horizon is significantly dependent on the frequency of the launched probe wave. Linear-stability analysis of dark solitons under the perturbation of a weak probe wave is performed to clarify the intrinsic mechanism of the nonlinear interaction. The probe wave manipulated collisional dynamics between both dark solitons are investigated as an analogue of the combined white-hole and black-hole horizons which provides some insights into exploring the transition between integrable and non-integrable systems. © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
语种：
英文
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Optical event horizon-based complete transformation and control of dark solitons
作者：
Deng, Zhixiang;Chen, Yu;Liu, Jun* ;Zhao, Chujun;Fan, Dianyuan
期刊：
Optics Letters ,2018年43(21):5327-5330 ISSN：0146-9592
通讯作者：
Liu, Jun
作者机构：
[Deng, Zhixiang; Fan, Dianyuan; Chen, Yu; Liu, Jun] Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong, Key Lab Optoelect Devices & Syst,Int Collaborat L, Shenzhen 518060, Peoples R China.;[Deng, Zhixiang] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Liu, Jun] Aston Univ, Sch Engn & Appl Sci, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England.;[Zhao, Chujun] Hunan Univ, IFSA Collaborat Innovat Ctr, Sch Phys & Elect, Minist Educ,Lab Micro Nanooptoelect Devices, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Liu, Jun] S;[Liu, Jun] A;Shenzhen Univ, Coll Optoelect Engn, Minist Educ & Guangdong, Key Lab Optoelect Devices & Syst,Int Collaborat L, Shenzhen 518060, Peoples R China.;Aston Univ, Sch Engn & Appl Sci, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England.
关键词：
Mathematical transformations;Probes;Cascaded system;Control process;Dark solitons;Event horizon;Internal phase;Nonlinear phase shift;Optical soliton;Tunneling phenomena;Solitons
摘要：
We propose a manipulation approach to vary the wave speed, as well as the grayness, of dark solitons under the optical event horizon arising from the interaction between a dark soliton and a probe wave. To the best of our knowledge, the optical event horizon effect is demonstrated for the first time to be capable of inducing a reversible conversion between a black soliton and a gray one. This reversible soliton transformation and control process originates from the intrinsic competition between the probe-induced nonlinear phase shift and the internal phase of the dark soliton. In a cascaded system consisting of two optical event horizons, we also observe the new optical soliton tunneling phenomena where a dark soliton can be reset longitudinally purposely. The results may find applications in information cloaking such as effectively hiding the presence of intermediate fiber section to the receiver. © 2018 Optical Society of America.
语种：
英文
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Active control of adiabatic soliton fission by external dispersive wave at optical event horizon
作者：
Deng, Zhixiang;Liu, Jun* ;Huang, Xianwei;Zhao, Chujun;Wang, Xinlin
期刊：
Optics Express ,2017年25(23):28556-28566 ISSN：1094-4087
通讯作者：
Liu, Jun
作者机构：
[Deng, Zhixiang; Wang, Xinlin] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Liu, Jun] Shenzhen Univ, Int Collaborat Lab Mat Optoelect Sci & Technol 2D, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov,Coll Optoelect Engn, Shenzhen 518060, Peoples R China.;[Liu, Jun] Aston Univ, Sch Engn & Appl Sci, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England.;[Huang, Xianwei] Hunan Univ, Coll Comp Sci & Elect Engn, Changsha 410082, Hunan, Peoples R China.;[Zhao, Chujun] Hunan Univ, Sch Phys & Elect, IFSA Collaborat Innovat Ctr, Lab Micro Nanooptoelect Devices,Minist Educ, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Liu, Jun] S;[Liu, Jun] A;Shenzhen Univ, Int Collaborat Lab Mat Optoelect Sci & Technol 2D, Key Lab Optoelect Devices & Syst, Minist Educ & Guangdong Prov,Coll Optoelect Engn, Shenzhen 518060, Peoples R China.;Aston Univ, Sch Engn & Appl Sci, Aston Inst Photon Technol, Birmingham B4 7ET, W Midlands, England.
关键词：
Dispersion (waves);Optical fibers;Dispersive waves;Group velocities;Higher-order solitons;Propagation properties;Pulse evolution;Soliton fission;Supercontinuum sources;Temporal separation;Solitons
摘要：
We show that the group-velocity-led optical event horizon (OEH) in optical fibers provides a convenient way to actively control the propagation property of higher-order solitons by a comparatively weak dispersive wave (DW) pulse. It has been found numerically that clean soliton breakup, a process by which a second-order soliton completely splits into a pair of constituent solitons with vastly different power proportions after interacting with the weak DW pulse, will occur while external DWs become polychromatic. The temporal separation between both constituent solitons can be controlled by adjusting the power of the external DW. The more energetic main soliton is advanced/trailed in time depending on the selected frequency of input DW pulse. We have developed an analytic formalism describing the external acting-force (AF) perturbation. These results provide a fundamental explanation and physical scaling of optical pulse evolution in optical fibers and can find applications in improved supercontinuum sources. © 2017 Optical Society of America.
语种：
英文
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Optical filtering properties of subwavelength Tai-chi-shaped metal hole arrays
作者：
Wang, Xinlin* ;Liu, Hui;Luo, Hu;Zhu, Weihua;Chen, Zhiyong;...
期刊：
Optics Communications ,2015年340:56-62 ISSN：0030-4018
通讯作者：
Wang, Xinlin
作者机构：
[Zhu, Weihua; Wang, Xinlin; Guo, Wei; Luo, Hu; Chen, Zhiyong; Liu, Hui; Liu, Jun] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Wang, Xinlin] U;Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
关键词：
Electromagnetic pulse;Finite difference time domain method;Light transmission;Optical properties;Plasmons;Polarization;Silver;Dielectric-metal interface;Femtosecond optical pulse excitation;Finite-difference time-domain (FDTD) methods;Optical transmission property;Shaped structures;Subwavelength hole arrays;Surface plasmons;Surface plasmons resonances;Time domain analysis
摘要：
Finite-difference time-domain (FDTD) method is employed to study the optical properties of a novel kind of periodic subwavelength hole arrays composed of Tai-chi-shaped holes in silver film, and the optical transmission properties of femtosecond optical pulse excitation is numerically calculated. We find that this Tai-chi-shaped device has better optical band-pass filtering properties, such as narrower pass band and higher transmissivity in visible wavelengths range, than other devices under consideration. Based on the generation of surface plasmons resonance mode in the dielectric-metal interface, the center wavelength of transmission can be tuned by changing the array periodicities. We observe that the tune ability mainly depends on the space period along the direction parallel to that of the incident pulse polarization. It is also found that both the strength and the wavelength of the transmission peaks of rectangularly distributed metal hole arrays are determined by the polarization of incident light. Additionally, we demonstrate the typical band-pass filtering properties of this Tai-Chi-shaped holes structure. The full-width at half-maximum (FWHM) of the narrow pass band is about 20 nm in visible wavelengths range. (C) 2014 Elsevier B.V. All rights reserved.
语种：
英文
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周期性鱼形孔阵列金属微纳结构的增强光透射特性
作者：
易陈林 Yi Chenlin;刘珺 Liu Jun;刘辉 Liu Hui;陈志勇 Chen Zhiyong;郭玮 Guo Wei;...
期刊：
激光与光电子学进展 ,2013年50(5):217-222 ISSN：1006-4125
作者机构：
[易陈林 Yi Chenlin; 刘珺 Liu Jun; 刘辉 Liu Hui; 陈志勇 Chen Zhiyong; 郭玮 Guo Wei; 朱卫华 Zhu Weihua; 王新林 Wang Xinlin] 南华大学电气工程学院
关键词：
薄膜;透射特性;局域波导共振;表面等离波子共振;鱼形孔结构
摘要：
利用三维时域有限差分(3D-FDTD)方法,研究了具有周期性亚波长鱼形孔阵列微纳结构金属膜的光学透射特性,探讨了单元尺寸和孔的形状对这种结构的基于透射的光学滤波特性的影响。结果显示鱼形孔阵列金属微结构具有较高的透射效率,并且具有较高的滤波品质因子。通过分析电场分布图,揭示了这种透射的两种不同物理机制:局域波导共振模式和表面等离波子共振模式。两种共振模式在鱼形孔区域的不同位置、不同时刻以不同形式出现。
语种：
中文
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The energy-saving optimization of the organic heat transfer material heater
作者：
Gu, Weili* ;Liu, Jianxiang
期刊：
Advanced Materials Research ,2012年455-456:284-288 ISSN：1022-6680
通讯作者：
Gu, Weili
作者机构：
[Gu, Weili] Univ South China, Dept Urban Construct, Sch Energy & Power Engn, Changsha, Hunan, Peoples R China.;[Liu, Jianxiang] Univ South China, Dept Urban Construct, Hengyang, Hunan, Peoples R China.
通讯机构：
[Gu, Weili] U;Univ South China, Dept Urban Construct, Sch Energy & Power Engn, Changsha, Hunan, Peoples R China.
会议地点：
Macau, China
关键词：
Energy-saving optimization;Exergy loss;Irriversible process;The organic heat transfer material heater
摘要：
this paper studies the typical irreversible processes such as combustion and heat transfer with temperature difference based on the theory of thermodynamics, analyzes the influencing factors on exergy loss in irreversible processes, on the basis of this analysis, proposes the energy-saving optimization measures on design and operation management of the organic heat transfer material heater, and specially points out that in the design process, objective function can be constructed with the exergy loss as evaluation index to determine the outlet flue gas temperature of furnace and the flue gas temperature, and provides theoretical basis for the determination of design parameters.
语种：
英文
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金属狭缝填充非线性材料光分束特性的FDTD模拟
作者：
易陈林;罗虎;陈志勇;刘珺;朱卫华;...
期刊：
光电技术应用 ,2012年27(1):54-59 ISSN：1673-1255
作者机构：
南华大学电气工程学院,湖南衡阳,421001;[易陈林; 罗虎; 陈志勇; 刘珺; 朱卫华; 文明; 王新林] 南华大学电气工程学院，湖南 衡阳
关键词：
表面等离子体;光分束器;时域有限差分法;非线性材料;金属狭缝
摘要：
设计并优化了基于金属狭缝填充非线性材料的光分束器。利用时域有限差分法,数值模拟850 nm TM波经填充非线性光学材料InGaAsP的亚波长银薄膜狭缝结构的光分束特性,结果表明：仅仅通过调整金属狭缝宽度、数量或排列顺序,便可调制该光分束器输出端口数量或能量分布;改变入射光强,可动态调控输出端口数量。设计的七缝对称结构具有1×5对称光分束特性。该器件具有动态可调、结构相对简单、输出端口较多等特点,在微纳光子集成和光通信中有潜在应用价值。
语种：
中文
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光电子成像方法研究N2多光子电离过程
作者：
郭玮;刘珺;陈志勇;朱卫华
期刊：
南华大学学报(自然科学版) ,2012年26(3):64-68 ISSN：1673-0062
作者机构：
南华大学电气工程学院,湖南衡阳,421001;[郭玮; 陈志勇; 朱卫华; 刘珺] 南华大学
关键词：
光电子成像;两步模型;里德堡态;有质动力势;共振/非共振布居转移;通道关闭
摘要：
利用速度映像成像技术实验探测了N2在70fs，410nm，场强（1—3）×10^14W／cm2范围内的光电子成像，获得了光电子的动能分布和角分布．研究表明分子强场电离有一些和原子相似的性质．电子产生于两步过程，中间态有真实布居．在低场强非共振布居转移起主要作用，在较高场强共振布居转移起主要作用．光电子角分布体现中间态的角量子数特征．
语种：
中文
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脉宽对飞秒激光烧蚀合金影响的数值模拟
作者：
陈志勇;刘珺;朱诗佳;朱卫华;吴鹤;...
期刊：
光电技术应用 ,2011年26(6):39-44 ISSN：1673-1255
作者机构：
南华大学电气工程学院,湖南衡阳,421001;[陈志勇; 刘珺; 朱诗佳; 朱卫华; 吴鹤; 王新林] 南华大学电气工程学院， 湖南 衡阳
关键词：
飞秒激光烧蚀;B2结构镍钛合金;压力传输边界条件;双温模型;分子动力学
摘要：
运用结合双温模型的分子动力学模拟方法,研究了飞秒激光与B2结构镍钛合金相互作用的烧蚀机制。采用中心波长为800 nm,能量密度为29.3 mJ/cm2,脉宽分别为50、200、500、1 000 fs激光烧蚀90 nm厚度的靶材,并对靶材底部运用压力传输边界条件,表明传输边界条件能够运用于该数值模拟中。靶材温度、内部压力随时间的演化以及原子位型展示了脉宽对烧蚀行为的影响。结果显示,相同能量密度下,脉宽越大辐照中心处电子峰值温度越低而辐照中心处晶格峰值温度越高,靶材热影响区域也越大。脉宽为200、500、1 000 fs时发生烧蚀现象。
语种：
中文
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