A5102896702- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Fault Detection and Control Systems
- Advanced Statistical Process Monitoring
- Nonlinear Photonic Systems
- Laser-Matter Interactions and Applications
- Civil and Geotechnical Engineering Research
- Power Line Inspection Robots
- Radiation Dose and Imaging
- Control Systems and Identification
- Photonic Crystal and Fiber Optics
- Risk and Safety Analysis
- Cancer Treatment and Pharmacology
- Aerospace and Aviation Technology
- Solid State Laser Technologies
- Data Analysis with R
- Landslides and related hazards
- Sensorless Control of Electric Motors
- Marine Toxins and Detection Methods
- Spectroscopy and Chemometric Analyses
- Modeling, Simulation, and Optimization
- Patient Safety and Medication Errors
- Sensory Analysis and Statistical Methods
- Geothermal Energy Systems and Applications
Peking University
2003-2024
California Institute of Technology
2022-2023
University of Cincinnati
2020
Sidney Kimmel Cancer Center
2017
Zhejiang University
2013-2014
Zhejiang Ocean University
2013-2014
Universidad del Noreste
2011-2013
Shijiazhuang Tiedao University
2010
Dissipative Kerr soliton (DKS) featuring broadband coherent frequency comb with compact size and low power consumption, provides an unparalleled tool for nonlinear physics investigation precise measurement applications. However, the complex dynamics generally leads to stochastic formation process makes it highly challenging manipulate number temporal distribution in microcavity. Here, synthesized reconfigurable crystals (SCs) are demonstrated by constructing a periodic intra-cavity potential...
Solitons in microresonators have spurred intriguing nonlinear optical physics and photonic applications. Here, by combining Kerr Brillouin nonlinearities an over-modal microcavity, we demonstrate spatial multiplexing of soliton microcombs under a single external laser pumping operation. This demonstration offers ideal scheme to realize highly coherent dual-comb sources compact, low-cost energy-efficient manner, with uniquely low beating noise. Moreover, selecting the modes, repetition rate...
Normal group velocity dispersion (GVD) microcombs offer high comb line power and pumping efficiency compared to bright pulse microcombs. The recent demonstration of normal GVD using CMOS foundry-produced microresonators is an important step toward scalable production. However, the chromatic devices large impairs generation broadband Here, we report development a microresonator in which reduced due coupled-ring resonator configuration. Operating turnkey self-injection locking mode, integrated...
Abstract Soliton microcombs are helping to advance the miniaturization of a range comb systems. These combs mode lock through formation short temporal pulses in anomalous dispersion resonators. Here, new microcomb is demonstrated that locks pulse pairs coupled normal Unlike conventional microcombs, this system cannot exist alone, and instead phase wherein each pair feature different optical spectra. The pairwise mode-locking modality extends multiple beyond two rings, it greatly constrains...
Soliton mode locking in high-Q microcavities provides a way to integrate frequency comb systems. Among material platforms, AlGaAs has one of the largest optical nonlinearity coefficients, and is advantageous for low-pump-threshold generation. However, also very large thermo-optic effect that destabilizes soliton formation, femtosecond pulse generation only been possible at cryogenic temperatures. Here, microresonators room temperature reported first time, best our knowledge. The...
Kerr soliton microcombs in microresonators have been a prominent miniaturized coherent light source. Here, for the first time, we demonstrate existence of solitons an optomechanical microresonator, which nonlinear model is built by incorporating single mechanical mode and multiple optical modes. Interestingly, exotic vibrational state found, modulated self-sustained oscillation. Besides, provides extra gain through spring effect, results phonon lasing with red-detuned pump. Various dynamics...
A new method is proposed to predict upcoming alarm events for a current sequence by exploiting similar historical flood sequences. The composed of two main steps. first step sorts the sequences in descending order similarity scores with respect sequence. second chooses some subsequence recent and predicts an event based on these having same subsequence. Bayesian estimator exploited calculate posterior probabilities their confidence intervals all candidates predicted events. optimal one...
Dissipative soliton Kerr frequency combs in microresonators have recently been demonstrated with the self-injection locking process. They advantage of turnkey deterministic comb generation and simplifying dark normal dispersion regime. Here, formation process pulses triggered by is studied regarding them as a pair domain walls that connect domains having different intracavity powers. The mechanism allows to self-regulate their position so wide range states can be accessed, duty cycle...
Alarm trippoints are critical parameters of industrial alarm systems in process industries. This paper proposes a method to design optimal for univariate analog variables based on so-called probability plots. An plot involves four statistics, namely, the transition and averaged step toward an trippoint, away from trippoint. Theoretical expressions statistics developed Markov chain theory. The estimated with proper determination quantification intervals transferring discrete state variables....
Alarm systems are of paramount importance for safe and efficient operations industrial plants. This paper proposes a method to design dynamic alarm limits adjust manipulated variables multivariate systems. A hyper-ellipsoid model is built from historical normal data points represent operating zone (NOZ). Dynamic each involved process variable mathematically defined calculated based on the NOZ. Adjustment amplitudes some determined in order remove occurring alarms, by exploiting reduced NOZs...
Kelly sidebands are a special type of dispersive wave that appear in mode-locked systems and they have recently been observed by pulsed excitation integrated microcombs. Here, generated continuous-wave partially coupled racetrack-resonator microcomb. The coupled-racetrack system supports two optical bands so that, contrast to earlier studies, the soliton sideband reside distinct bands. resulting interband relaxes power requirements is demonstrated. Tuning spectral position under also...
Partial association refers to the relationship between variables Y1,Y2,…,YK while adjusting for a set of covariates X={X1,…,Xp}. To assess such an when Yk's are recorded on ordinal scales, classical approach is use partial correlation latent continuous variables. This so-called polychoric inadequate, as it requires multivariate normality and only reflects linear association. We propose new framework studying ordinal-ordinal by using Liu-Zhang's surrogate residuals. justify that conditional...
Alarm monitoring, which is implemented by an alarm system, to generate alarms for a process through certain mechanisms when the in abnormal condition. This brief proposes method design system with dynamic limits multivariate processes. A normal operating zone (NOZ) described convex hull established from historical data points based on formulated fitness index, and of each variable are developed NOZ. If all variables inside their own limits, condition no raised; otherwise, will occur. The...
Femtosecond pulse pairs are generated in coupled microresonators featuring nor-mal dispersion. This bright soliton mode locking modality is observed to recur at multiple spectral windows and shown extend additional rings.
<title>Abstract</title> The emergence of soliton microcombs has catalyzed significant advancements in a wide range applications, including optical communication, precision metrology, and astronomical calibration. Despite the existing benefits, generated passive microcavities often face limitations promoting comb power nonlinear efficiency. On other hand, generating combs within active microresonators remained challenging due to confined cavity volume for doping substantial opto-thermal...
Multi-color co-propagating and counter-propagating solitons are generated using a coupled-ring microresonator in the ultra-low-loss Si 3 N 4 platform. Soliton spectra beatnotes measured potential applications discussed.
Counter-propagating solitons are generated in CMOS-ready coupled microresonators featuring normal dispersion. In each direction, the soliton mode locks and compensates dispersion through formation of a pulse pair. Both spectra radiofrequency beatnotes counter-propagating observed.
To predict the vibration characteristics of rotor-bearing system by using scale model and associated scaling laws may significantly reduce time money required experiments. this end, dynamic similarity criteria are investigated inferring from behavior to response prototype. The similar relationship was established combining method dimensional analysis equation based on theory, effectiveness verified through finite element method. result provide theoretical rational for further study design system.
In this paper, the mechanical structure of a novel two-phase hybrid stepping motor, which offers big transmission ratio and fast response characteristics, is proposed. Comparing with typical permanent magnet new model placed on stator, thus it has better utilization space than conventional motor. Furthermore, motor torque mathematical established. And vector analysis method we provide here you an intuitive way research type operation principle control mode.
Aiming at the problem that high-voltage inspection robot is susceptible to wind load when inspecting line, which leads poor stability and low safety of airframe, a balanced method magnetic torque based on HVDC field proposed: The dynamic balance achieved through ampere generated by current-carrying coil in offset moment. According actual working conditions robot, simulation model was calculated simulated established. results show could produce met requirements under set parameters. Finally,...
The main difficulties in modelling dynamics of a helicopter arise from the structure complexities and dynamic uncertainties rotorcrafts. This paper illustrates simple accurate identification approach for modelling. To minimize modeling complexities, model structures are derived main-rotor tail-rotor subsystems through comprehensive analysis. cope with uncertainties, handling qualities (HQ) based parameters, instead ordinary identified frequency-sweep test data particle swarm optimization...