A5027117222- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Metallic Glasses and Amorphous Alloys
- Power Systems Fault Detection
- Magnetic Properties and Applications
- Magnetic properties of thin films
- Smart Grid Security and Resilience
- Power Line Communications and Noise
- Network Time Synchronization Technologies
- HVDC Systems and Fault Protection
- High-Voltage Power Transmission Systems
- Islanding Detection in Power Systems
- Crystallography and molecular interactions
- Real-Time Systems Scheduling
- Power System Optimization and Stability
- Magnetic Properties of Alloys
- Petri Nets in System Modeling
- Microstructure and mechanical properties
- Enzyme-mediated dye degradation
- Lignin and Wood Chemistry
- Intermetallics and Advanced Alloy Properties
- Geophysics and Sensor Technology
- Satellite Communication Systems
- Material Dynamics and Properties
- Theoretical and Computational Physics
University of Jinan
2021-2024
Chongqing University of Posts and Telecommunications
2024
Jiangsu University
2024
Chinese Academy of Sciences
1988-2023
University of Science and Technology of China
2023
University of Strathclyde
2018-2020
University of Manchester
2014-2016
Henan Polytechnic University
2010
Institute of Physics
1981-2001
Industrial Union of Metalworkers
2001
Accurate timing is often required for the intelligent electronic devices (IEDs) used in transmission substations. A common method of achieving this direct connection a device to local global positioning system (GPS) receiver and use its one-pulse-per-second synchronizing signal IRIG-B coded message. However, concerns about GPS reliability are encouraging systems less dependent on receivers. The IEEE 1588 protocol network-based time synchronization technique designed coexist with IEC 61850...
Lignin, the largest non-carbohydrate component of lignocellulosic biomass, is also a recalcitrant plant cell wall. While aerobic degradation mechanism lignin has been well-documented, anaerobic still largely elusive. In this work, versatile facultative lignin-degrading bacterium, Klebsiella aerogenes TL3, was isolated from termite gut, and found to metabolize variety carbon sources produce single kind or multiple kinds acids. The percent alkali reached 14.8% under conditions, could reach...
The evolution of the magnetic domain patterns and giant magnetoimpedance (MI) effect in Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons are studied as a function annealing time ta at 550 °C. It is shown that by °C for from 1 to 150 h, very fine nanocrystalline bcc-FeSi grains homogeneously formed matrix. Although with increasing grain size remains (⩽11 nm), coercivity Hc increases rapidly 0.0014 Oe ta=3 h 1.67 ta=150 h. For structure characterized few broad longitudinal together some transverse...
Time synchronization systems that utilize the global navigation satellite (GNSS) are widely used in monitoring, control, and protection of transmission networks. They ensure phasor measurement units (PMUs) can accurately monitor voltage phase angles, increase accuracy fault locators, enhance capabilities disturbance recorders, allow differential feeder to use re-routable communication However, concern about reliability GNSS receivers intelligent electronic devices (IEDs) have been reported;...
The components of the resistance $R$ and reactance $X$ complex impedance $Z=R+iX$, as well relative effective permeability ${\ensuremath{\mu}}^{\ensuremath{'}}$, for as-quenched nanocrystalline ${\mathrm{Fe}}_{73.5}$Cu${\mathrm{Nb}}_{3}$${\mathrm{Si}}_{3.5}$${\mathrm{B}}_{9}$ ribbons have been studied functions drive current frequency (1 kHz to 13 MHz) longitudinal magnetic field (-75 75 Oe). For samples, a mostly resistive feature was found over whole range. magnetoimpedance effect more...
Coercivity Hc, the initial susceptibility χo, and Rayleigh constant α of metallic nanocrystalline ferromagnets produced by annealing an amorphous Fe60Co30Zr10 alloy above crystallization temperature is investigated as a function grain size d. It shown that Hc χo follows d6 d−6 power law, respectively. The dependence magnetic properties are discussed within framework random anisotropy model. For small fields H < 0.5Hc, magnetization curves obey Rayleigh's law. experimental relation between...
Substations are increasingly reliant on devices compatible with IEC61850 standards. However, the conformity of a device standards does not necessarily guarantee interoperability from different manufacturers. The use presents challenge to many system integrators, especially due lack familiarity features, such as generic object-oriented substation event, reporting, sample values, and need for redundancy. To facilitate smooth implementation, all features data exchanges between be tested ensure...
A sensitive field- and frequency-dependent magnetoimpedance (MI) has been observed in nanocrystalline Fe73.5Cu1Nb3Si13.5B9 ribbons. maximum value for the MI ration ΔZ/Z=[Z(H)−Z(Hmax)]/Z(Hmax), of more than 400% was obtained these ribbons (annealed 3–5 h at 550 °C). peak field dependence ratio ΔZ/Z samples, but not as-quenched amorphous samples. The sensitivity attained a larger 60% Oe−1 range 3–7 Oe 800 kHz Domain observation experiments show that transverse domain structure samples is...
Vision-based cooperative motion estimation is an important problem for many multi-robot systems such as aerial target pursuit. This can be formulated bearing-only estimation, where the visual measurement modeled a bearing vector pointing from camera to target. The conventional approaches are mainly based on framework distributed Kalman filtering (DKF). In this paper, we propose new optimal algorithm, named spatial-temporal triangulation, method of recursive least squares, which provides more...
A comprehensive analysis of magnetoimpedance (MI) phenomena in Fe-based nanocrystalline ribbons is presented this paper. Giant MI responses have been observed samples annealed over the temperature range 490 and . More than 400% increases ratio were obtained both ribbons. The sensitivity can reach a value larger field 3 - 7.2 Oe at 800 kHz for No effect was an as-quenched amorphous sample, because its very low permeability. mostly resistive feature found sample. dependences effective...
The influence of substitution B for Fe on the microstructure, magnetic properties, and giant magnetoimpedance (GMI) effect has been studied nanocrystalline soft ribbons Fe92−2Zr7BxCu1 (x=2,4,6,8,10) annealed at 873 K 20 min. experimental results show that thermal stability amorphous precursor is enhanced body-centered-cubic phase grains become smaller with increasing content. coercive force Hc exhibits a minimum 2.51 A/m ribbon x=8, where effective permeability reaches maximum. frequency...
Communication is a key factor to the success of future Smart Grid. Among various technologies, Ethernet predominant one for Local Area Network (LAN) communication due its low cost and high speed Power Substations will see increasing use in protection & control sector. The based IEEE 15882008 time synchronization protocol can realize sub-micro second accuracy be regarded as good alternative conventional method on distributed GPS receivers. Meanwhile, become carrier information, it necessary...
A novel approach in distribution protection technique of fault line selection is presented based on transient signals detected with the wavelet transform maximal module this paper. The characteristic frequency band each line, which most concentrated, chosen according to view maximum energy. For case that lies or out a same one, two types numerical detecting criteria are proposed. proposed method overcomes blindness determining feasible conventional methods cannot avoid. effectiveness and...
In this paper, we investigate the low complexity uplink transmission channel estimation (CE) algorithms for problem of limited computational resources in massive multiple-input multiple-output (mMIMO) Earth orbit (LEO) satellite Internet Things (IoT) scenarios. We use angular-domain to characterize exploit its sparse characteristics and formulate joint user activity detection (UAD) CE as a vector recovery by combining it with active matrices IoT scenario. Finally, propose enhanced...
Traditional protection and control systems in many UK National Grid Substations are reaching the end of their asset design life. This provides an opportunity to investigate whether new architecture that deploys Intelligent Electronic Device (IED) technology can deliver a reliable solution is economically appropriate delivers long The application IEDs utilize IEC61850 based process bus reduces life-time cost secondary improves flexibility functionality by accommodating high-speed peer-to-peer...
Due to the overload limitation of converters, main protection for DC lines High Voltage Direct Current based on Modular Multilevel Converter (MMC-HVDC) requires ultra high speed fault detection. The principles single-terminal traveling-wave can meet this requirement. Such which are usually constructed by transmission theory have a clear physical concept and do not depend boundary components. Almost all these dependent accurately detecting arrival time traveling-waves. Thus, it is urgent...