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SnS van der Waals epitaxies (vdWEs) were grown by molecular beam epitaxy (MBE) on graphene buffer layer. Photo-absorption measurements indicate an indirect bandgap of ∼1 eV and a direct bandgap of ∼1.25 e V. Using this novel growth technique we observed significant lowering in the crystal size and the rocking curve FWHM compared to films deposited without the buffer layer. The absorption coefficient,...
Employing a nanotube-based saturable absorber, we demonstrate a continuously tunable (1533–1563nm) ultrafast fiber laser, with output pulsewidth switchable between picosecond (1.2 ps) and femtosecond (610 fs) regimes.
We demonstrate a dual-wavelength, carbon nanotube mode-locked Er fiber laser. The laser outputs two wavelengths at 1549nm and 1562nm, and each wavelength corresponds to pulse duration of ∼1.3ps and repetition rate of ∼11.27MHz.
A high sensitivity photonic temperature sensor based on silicon eye-like microring resonator system (EMRS) is reported. The results show great enhancement of the sensing performance by using the EMRS configuration.
The paper summarizes the development and operation of the technical supporting systems in control centers and substations of China Southern Power Grid (CSG). Smart applications can be, based on functional integration and data sharing, developed for the operation of complicated power grids. A brand new conceptual model of next generation smart system, named Operation Smart System (OS2), is proposed...
This paper presents a series of optimization models for Phasor Measurement Unit (PMU) placement with new considerations. Extended from the formulations based on integer linear programming, issues concerning uncertainty propagation are discussed and an improved model is proposed to alleviate the impact. Furthermore, as it is more valuable in practice with incrementally placing PMUs, a multistage installation...
In this paper, modeling of electromagnetic field distribution inside an electrically large closed environment is presented by using a hybrid simulation technique, which combines a full-wave method and an asymptotic technique. In the hybrid scheme, the Method of Moments is used to model the transmitting/receiving antennas and their nearby objects. The equivalent sources obtained from the MoM solution...
In this paper, we suggest a new electormigration method to improve the previous electromigration method. The method is that electrical break-down is carried out during metal deposition for the fabrication of electrodes. As a result, the nanogap structure can be confirmed and break-down current showed lower magnitudes than the previous method. These result indicated possibility of applications to mass...
A ring-shaped piezoelectric resonator was proposed for health monitoring. The proposed resonator is believed to be experienced several energy loss mechanisms, when used in air or liquid circumstance. Actually, the quality factor of film bulk acoustic resonator in liquid might be decreased to 5% of that in air. So, it is necessary to accomplish suitable structural design and select proper vibration...
The super-harmonic effect has been studied using a piezoelectric micro-cantilever with a proof mass. The fabricated prototype device, comprised with a multilayer of Pt/Ti/PZT/Pt/Ti/SiO2 deposited on a silicon-on-insulator (SOI) wafer, has been measured to have an eigenstate frequency of around 816 Hz. The driven frequencies of 204, 272, 409 and 816 Hz have been then converted into the resonant one...
This paper reports that the effect of nonlinear vibration on double region of synchronized frequency responses in a mechanically coupled beam-shaped oscillator, so as to further expand the applicable limits for practical mass perturbation. The resonant frequency was multiplied via synchronization by introducing a coupling overhang, and the double region was magnified from 30 Hz to over 400 Hz by increasing...
The use of vibration mode localization in arrays of mechanically-coupled, nearly identical beam-shaped resonators has been studied for ultra-sensitive mass detection and analyte identification. This study seeks to enhance the amount of amplitude change due to vibration mode localization with a beam shaped 3-resonator array. The preliminarily results have been discussed from view point of vibration...
This paper presents complete Verification, Validation, and Uncertainty Quantification (VV&UQ) procedures that are applied to a two-level boost rectifier. The goal of this VV&UQ study is the improvement of the modeling procedure for power electronics systems, and the full assessment of the boost rectifier model (as an example) predictive capabilities. Modeling and simulation of large systems...
High-performance routers for next generation networks are required to scale with the increasing 'port number' due to developments of various network access technologies. It has been common practice to build scalable multi-stage multi-layer switches in circuit switching. For packet switches, however, researchers have so far had no consensus on how to employ the multi-stage multi-layer architecture...
China's renewable energy resource such as wind and solar energy resources mainly distributed in the northeast, northwest, north China, while China's electricity load centre is in the eastern and central regions. Therefore, longdistance, large-capacity and cross-regional transmission of wind power is one of the significant challenges for China's renewable power development and utilisation. Based on...
This paper presents a systematic introduction to the development of a specific topic in power engineering, probabilistic analysis of small-signal stability of power systems. The paper firstly reviews the problem of small-signal stability of power systems and its significant demand for probabilistic analysis. Then the framework of probabilistic analysis of small-signal stability is introduced. Three...
The optimal corrective damping control time has a distinct influence on system recovery trajectories. This paper applies the transient energy function (TEF) method for computing the optimal control time of generation decreasing and load shedding for single machine infinite bus and multi-machine system. In the paper, the proposed calculation method is tested in single-machine infinite-bus system and...
The power system stabilizers (PSSs) are widely used in the power system to suppress the power oscillations. How to effectively set the parameters of the power system stabilizers (PSSs) becomes a vigorous topic discussed in many papers. In this paper, a new method is proposed for online self-design or self-adjustment of the power system stabilizers (PSSs) based on the tie-line power variation measured...
In this paper, a generalized steady state multi-terminal voltage source converter based high voltage direct current (VSC MTDC) model suitable for power system state estimation is introduced. The process of incorporation of VSC MTDC model in AC/DC state estimation is described in detail. The proposed approach simultaneously upgrades the estimated values of the state variables of MTDC system and the...
The increased complexity and interconnectivity of Supervisory Control and Data Acquisition (SCADA) systems in the Smart Grid has exposed them to a wide range of cyber-security issues, and there are a multitude of potential access points for cyber attackers. This paper presents a SCADA-specific cyber-security test-bed which contains SCADA software and communication infrastructure. This test-bed is...
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