A5070419048- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Optical Coatings and Gratings
- Laser Design and Applications
- Stability and Control of Uncertain Systems
- Advanced Fiber Laser Technologies
- Geophysics and Gravity Measurements
- Optical Systems and Laser Technology
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astrophysics and Star Formation Studies
- Methane Hydrates and Related Phenomena
- Geomagnetism and Paleomagnetism Studies
- Microgrid Control and Optimization
- Adaptive Control of Nonlinear Systems
- Global trade and economics
- Photonic Crystal and Fiber Optics
- Electrochemical Analysis and Applications
- Terahertz technology and applications
- Economics of Agriculture and Food Markets
- Calibration and Measurement Techniques
Dalian University of Technology
2011-2025
Hubei University
2024
Ministry of Education of the People's Republic of China
2024
Huazhong University of Science and Technology
1987-2023
Purdue University West Lafayette
2023
Xihua University
2019-2023
Union Hospital
2023
State Nuclear Power Technology Company (China)
2023
National Computer Network Emergency Response Technical Team/Coordination Center of Chinar
2018-2022
Northwest Normal University
2021
This article investigates a class of linear-nonlinear switching active disturbance rejection control (ADRC) to design speed controllers and current for permanent magnet synchronous machine (PMSM) in servo systems, which aims at enhancing the ability PMSM. First, mathematical model PMSM is introduced. Next, ADRCs introduced details. Then, stability extended state observers (ESOs) proved by multiple Lyapunov functions. Lastly, effectiveness based on technique validated experiments results...
Abstract The Full-disk MagnetoGraph (FMG), a payload onboard the Advanced Space Solar Observatory (ASO-S), will measure vector magnetic field in photosphere. instrument consists of front-window filter, telescope, an LCVR polarimeter, image-stabilization system, seven-stage tunable Lyot CMOS camera with 4096×4096 pixels and pair calibration/focus wheels. In this paper, we describe design FMG provide summary test observations carried out prototype.
It is well known that proportional-integral-derivative (PID) controllers are dominant in industrial scenarios. PID with high-order derivative or integral terms named generalized superior to the PID. However, there little literature investigating how tune parameters of enhance disturbance rejection ability. Toward end, this article illustrates cascade based on first-order linear active (LADRCs) (cascade LADRCs) and LADRCs can be interpreted as low-pass filters for speed servo systems position...
The active surge control has superiorities in expanding the stable working range and reducing performance loss of aero-engines. Despite these benefits, ensuring fixed-time stability closed-loop system with model uncertainty remains a significant challenge. Conventional techniques to aero-engines often struggle suffer from long-time fault. To deal issues, this article proposes novel scheme for enhancing adaptability change extending service life First, considering aero-engines, radial basis...
As part of our ongoing effort to investigate transit timing variations (TTVs) known exoplanets, we monitored transits the four exoplanets HAT-P-18b, HAT-P-19b, HAT-P-27b/WASP-40b and WASP-21b. All them are suspected show TTVs due properties their host systems based on respective discovery papers. During past three years 46 observations were carried out, mostly using telescopes Young Exoplanet Transit Initiative. The analyses used refine systems' orbital parameters. In all cases found no...
Agency cost theory suggests that a firm’s financial leverage is important to improve organizational efficiency. Using data of industrial companies three biggest economies, this study analyzes how debt-financing decision affects firm efficiency and the mediating role cash holding. We find inverted U-shape relationship between level This implies firms with optimum capital structure achieve high The cash-holding negatively relates also document firms’ apply more are less likely hold excess...
CVSO 30 is a unique young low-mass system, because, for the first time, close-in transiting and wide directly imaged planet candidates are found around common host star. The inner companion, b, possible orbiting previously known weak-lined T Tauri With five telescopes of 'Young Exoplanet Transit Initiative' located in Asia, Europe South America, we monitored over three years total 144 nights detected 33 fading events. In two more seasons carried out follow-up observations with telescopes. We...
As a kind of special beams, Bessel beams are always research hot spot in optics due to its non-diffractive and self-healing properties. Here, zero-order terahertz (THz) with linear circular polarizations generated by using THz quarter wave plate Teflon axicons different opening angles. By applying digital holographic imaging system, the evolutions transverse (E x , E y ) longitudinal z electric fields coherently measured analyzed during propagation processes beams. The vectorial Rayleigh...
A vortex Bessel beam combines the merits of an optical and a beam, including spiral wave front non-diffractive feature, which has immense application potentials in trapping, fabrication, communications, so on. Here, linearly circularly polarized beams terahertz (THz) frequency range are generated by utilizing THz quarter plate, phase Teflon axicons with different opening angles. Taking advantage focal-plane imaging system, vectorial diffraction properties comprehensively characterized...
In this paper, a class of finite-time state zonotopes are proposed for the interval estimation switched systems with asynchronous switching. First, considering mismatch between system mode and observer mode, an augmented switching signal is adopted to deal asynchronism uniformly. Then, constructed in synchronous intervals, respectively, enclose actual state. Specific iteration procedures provided generator matrix. Moreover, new criterion newly address that error bounded pre-specified upper...
In this article, a linear switched active disturbance rejection controller (LSADRC) is proposed for the speed and voltage control of permanent magnet starter/generator (PMS/G). Different from existing works, type extended state observer (LSESO) newly introduced. The gains LSESO are not fixed anymore but adaptively changed with value system state. First, relationships analyzed between bandwidth performance. Then, whole working process divided into three regions by switching regulations...
Aimed at the application of multilayer dielectric gratings (MDGs) in spectral beam combining (SBC) technologies, a theoretical model trapezoidal MDGs has been proposed and propagation SBC system based on further built up. The phase modulation introduced by MDG involves optical path difference top surface relief, that relief films, which is affected groove depth, duty cycle, base angles incidence angle, so on. Using diffraction integral method principle incoherent superposition, intensity...
Incoherent spectral beam combining (SBC) of multiple laser beams is accomplished along the emitters' arraying direction. Considering that output from a array (LA) usually have deflection angles, positional displacements and divergence angles even after being collimated, propagation model SBC systems based on multilayer dielectric gratings has been built up. On basis, properties spectrally combined affected by parameters LA discussed in detail. Simulation results show with increase angle,...
ASO-S is a mission proposed for the 25th solar maximum by Chinese community. The scientific objectives are to study relationships among magnetic field, flares, and coronal mass ejections (CMEs). consists of three payloads: Full-disk Magnetograph (FMG), Lyman-alpha Solar Telescope (LST), Hard X-ray Imager (HXI), measure observe CMEs respectively. now under phase-B studies. This paper makes brief introduction mission.
This article investigates a modified linear–nonlinear switching active disturbance rejection control (LNSADRC) voltage controller which is suitable for the permanent magnetic synchronous generator (PMSG) high-speed operation in electrified aircraft scenarios. The improved LNSADRC integrates power approach law of sliding mode into extended state observer (ESO), more robust compared with linear (LADRC). Then, stability proposed proved by constructing multiple Lyapunov functions. Finally,...
The Chinese mathematical phantom (CMP) is a stylized human body model developed based on the methods of Oak Ridge National Laboratory (ORNL) series (OMPS), and data from Reference Asian Man Man. It constructed for radiation dose estimation Mongolians, whose anatomical parameters are different those Caucasians to some extent. Specific absorbed fractions (SAF) useful quantities primary internal dose. In this paper, general Monte Carlo code, N-Particle Code (MCNP) used transport particles...
We propose a scheme to realize single-photon diode and circulator using two waveguides chirally coupled five-level M-type atom. Two external control fields are introduced drive the emitter. Non-reciprocal propagation can be completed in our scheme, which underpins circulator. The work well at special frequency points of incident photon simultaneously. modulate Rabi frequencies detunings satisfy various values photon. In addition, non-reciprocity turned off or on when on. A single-frequency...
According to the multimode characteristics, aeroengines are usually modeled as switched systems better reflect working dynamics, and controllers designed fulfill different requirements for each subsystem, which may encounter control bumps at controller-switching instants. To solve this issue, a class of mode-recovered bumpless transfer is proposed aeroengines, not only can eliminate but also guarantees recoverability signal subsystem. First, compensator newly proposed, reshapes into...