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We experimentally demonstrated 10 GHz frequency comb spectral broadening with a 30-dB bandwidth of 238 nm in an 11-mm long AlGaAsOI nano-waveguide. The 10-GHz 230-fs pump pulse has an average power of only 12 mW.
In order to elevate equipment-oriented traditional asset management to system-oriented advanced asset management (AAM) decision-making for smart power grid, for the problem that influence of different positions of the equipment in network topology on system reliability is not taken into consideration in retiring strategies of transformer LCC (life cycle cost), which may cause overestimation or underestimation...
Five-hundred-meter Aperture Spherical radio Telescope (FAST) is a Chinese mega-science project to build the largest single dish radio telescope in Guizhou province, Southwest China. The construction of FAST will involve many kinds of analog and digital electrical equipments. The electrical equipments are potential threat to radio observation due to its ElectroMagnetic Interference (EMI) emission....
After five and a half years construction, the main structure of Five-hundred-meter Aperture Spherical radio Telescope (FAST) has been completed in September 2016. Meanwhile, a Radio Quiet Zone (RQZ) with radius 30 km has also been established. In order to evaluate the Radio Frequency Interference (RFI) influence from the mobile base stations within radius 5 km (the restriction zone of RQZ) around...
A modelling platform for active carrier removal based on metal-semiconductor-metal structure is reported on analysis of carrier dynamics. The analysis reveals electric current hot spots exist in geometric singularities and curly trajectory of carriers should be considered when accurately estimating the effective carrier lifetime.
In this paper, the misalignment property of the Conformal Strongly Coupled Magnetic Resonant (CSCMR) system is studied and applied to power multi-device simultaneously. A planar CSCMR WPT system shows excellent misalignment in azimuth plane compared to traditional SCMR system. The Receiving (RX) resonator can be moved around the Transmitting (TX) resonator in the same plane without scarifying efficiency...
In this paper, a novel method using 3-D Strongly Coupled Magnetic Resonance (SCMR) is proposed in order to miniaturize Wireless Power Transfer (WPT) systems. This method successfully tuned the operating frequency to lower frequencies with excellent efficiencies, thereby reducing the size of SCMR systems. Also, 3-D SCMR systems based on two and three layered spiral resonators in opposite directions...
The SMOS mission is developed for monitoring the surface soil moisture and ocean salinity by a two dimensional L-band synthetic aperture interferometric radiometer. However, artificial sources emitting in the protected L-band are contaminating the retrievals of the soil moisture and ocean salinity from the measurements. To mitigate the RFIs' impacts, the classical CLEAN algorithm was introduced and...
This work explores the benefits brought by the nonlocality. By coating the Ag nanostructures with third-order nonlinear dielectrics, the third harmonics of fundamental frequency can excite strong longitudinal mode resonance in Ag dimers with proper geometric design. Thereby the radiation of longitudinal modes can provide an enhancement for third-harmonic generation (THG) process in ultraviolant frequency.
In this paper, we propose a superpixel generation method for synthetic aperture radar (SAR) images by using the density-based spatial clustering of applications with noise (DBSCAN) algorithm. The pixels is firstly grouped to generate initial superpixels by using probabilistic patch-based (PPB) dissimilarity. Then, small clusters are combined into their neighbor superpixels to get final results through...
Radio frequency interference (RFI) has becoming a seriously limitation in the retrieval of geophysical parameters from the measurements of microwave radiometers. In this work, a novel RFI localization approach is presented here to improve the computationally complexity by using virtual arrays and direction of arrival (DOA) estimations techniques. The proposed RFI localization method utilizes the underlying...
We address the challenge of learning good video representations by explicitly modeling the relationship between visual concepts in time space. We propose a novel Temporal Preserving Recurrent Neural Network (TPRNN) that extracts and encodes visual dynamics with frame-level features as input. The proposed network architecture captures temporal dynamics by keeping track of the ordinal relationship of...
The probabilistic patch-based similarity measure (PPBSM) is a deeply studied and widely used method for synthetic aperture radar (SAR) image processing and understanding. Considering its performance limitation, we propose a preliminary exploration of integrating the spatial correlation information into the PPBSM, and design a refined method for SAR image change detection.
The concept of complex event processing (CEP) and complex-event-aware service have been extensively studied to retrieve relevant information from massive amount of realtime streaming events. In mobile environment, the Mobilityaware CEP (MCEP) system was proposed to address the issue of synchronization problem between different query ranges and MCEP operators. We noticed that MCEP systems lack the...
Design, production and installation of track slabs are critical technologies of high-speed rail which has become an important trend of the transportation development across the world. This paper mainly investigates the scheduling arrangements and optimization of precast production of track slabs. A Flow-Shop Multi-Objective Optimization Scheduling Model (FSMSM) has been developed and solved by a Hybrid...
This research presents a targeted person searching scheme in digital videos. It is assumed that a user is provided with an exemplar video that contains a targeted person and long investigated videos from which the scenes related the targeted person will be extracted. First, the exemplar video is processed to generate multiple representative face images, which are shown on an interface for the user...
Simultaneous MIMO-free transmission of a record number (12) of orbital angular momentum modes over 1.2 km is demonstrated. WDM compatibility of the system is shown by using 60 WDM channels with 25 GHz spacing and 10 GBaud QPSK.
Aluminum Gallium Arsenide on insulator (AlGaAs-OI) has recently been developed into a very attractive platform for optical signal processing. This paper reviews key results of broadband optical signal processing using this platform.
We experimentally demonstrate a single channel 32-GBd 16QAM THz wireless link operating in the 0.4 THz band. Post-FEC net data rate of 106 Gbit/s is successfully achieved without any spatial/frequency multiplexing.
This paper focuses on dynamic output feedback fault-tolerant control design of a class of delta operator linear systems with sensor faults. A full order dynamic output switching control law and a state switching law are jointly designed to guarantee the closed-loop asymptotical stability in the presence of all admissible sensor faults. A flight control switched system is employed to illustrate the...
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