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Ultrafast optical spectroscopy reveals surface-bulk scattering in the Weyl semimetal NbAs within 50 femtoseconds. The direction of this scattering can be controlled by the pump and probe polarizations, suggesting potential ultrafast device applications.
Irradiating thin foils with very intense laser pulses results in the emission of swift ion bunches. These laser-accelerated ions exhibit properties that substantially differ from conventionally accelerated particles. A large number of a variety of ion species distributed over a broad energy and angular spectrum are confined to very short bunch durations and are sought to enable novel applications...
High temperature vulcanized (HTV) silicone rubber (SiR) is widely used as HVDC cable accessory insulation considering its outstanding electrical properties along with elasticity and thermal resistance. However surface charge caused by corona would accumulate on SiR surface and distort the local field which in consequence led to accessory premature discharge and insulation failure. This paper tried...
High temperature vulcanized (HTV) silicone rubber (SiR), due to its excellent electrical insulation, elasticity and temperature resistance, is used in cable accessories for HVDC cables. The space charge, generated under dc stress in SiR, would distort the local electric field, furtherly influencing the characteristics of partial discharge and accelerating the insulation aging. This paper tried to...
We report the first successful real-time superchannel trials up to 5.6Tb/s over 359km and 2Tb/s over a live 727km link using 64GBaud flexible-rate transponders, demonstrating long term error-free performance and fast capacity turn-up of ∼2Tb/min.
In this paper, an approach based on the field equivalence principle for obtaining the information of the incident field from total field data is presented. In general, the incident field is not easy to know because it is related to not only the impressed source but also the characteristics of the transmitting antenna and the surrounding environment of the source. By using this approach, the incident...
High temperature vulcanized (HTV) silicone rubber (SiR), due to its better electrical insulation, elasticity, temperature resistance, is used in cable accessories for high voltage direct current (HVDC) cables. The space charge, formed under DC stress in SiR, would distort the local electric field, and furtherly influence the characteristics of partial discharge and accelerate the insulation aging...
Fast kurtogram (FK) has been broadly investigated on fault diagnosis for rolling element bearing(REB) since it is put forward. But its performance is low as incipient feature extraction and fault diagnosis of REB as noise has greatly effect on the classification accuracy. How to effectively improve the signal-to-noise ratio(SNR) is important for characteristic frequency(CF) determination based on...
In this study, OES (Optical emission spectrometer) was used to diagnose the variations of plasma species. QMS (Quadrupole mass spectrometry) was utilized to examine the concentration of free radicals in plasma. The epitaxial silicon thin film was deposited by electron cyclotron resonance chemical vapor deposition (ECR-CVD). The film properties related to thickness and crystallinity were investigated...
With the fast development of offshore wind farm, the cost-effective collection and transmission of large-scale offshore wind power has been an increasing concern. To better integrate the HVDC technology to the future offshore wind farms, advanced concepts of DC-DC power conversion and DC wind turbines can be extended to all-DC wind farm design. The state-of-art of three key technologies of the offshore...
Deep inside the ocean, the earth magnetic signal is one of the merely existing information that tells the heading of robots with very good cost efficiency. Therefore, this paper focuses on the AUV (Autonomous Underwater Vehicle) heading control problem using only one magnetic compass as feedback sensor. In this application, we address AUV modeling and control issues simultaneously. Because of quadratic...
A control-oriented modeling approach is proposed for a low-speed semi-AUV (Autonomous Underwater Vehicle) CISCREA, which has complex-shaped structures. Due to the geometry of this AUV, it is very difficult to identify its dynamic and hydrodynamic parameters. Therefore, the main objective of this paper is to find an efficient modeling approach to tune acceptable control design models. The presented...
Field-Programmable Gate Array (FPGA) offers advantages for many applications, particularly where missions are complex and time performance is critical. For small-production digital acoustic synthesizers, FPGA can achieve the above-mentioned tighter system requirements with low total system costs on single chip. In this manuscript, a real-time acoustic synthesizer is implemented using Fourier series...
The Maxwell fish eye lens has previously been utilised as an imaging device which exhibits sub-wavelength resolution. Here, we propose a new implementation based on surface waves which are excited in a dielectric slab over a metallic ground plane. Although the Maxwell fish eye lens has been shown to possess strong frequency dependence, this paper illustrates that for a single frequency, the proposed...
In the presence of arc, partial discharge and thermal discharge, SF6 decomposes into a wide variety of active products which possess different chemical properties. This paper reports on research in SF6 decomposition relating to the ageing- and fault problems of the insulating materials in the gas-insulated equipment. Under the guidance of detection technology, the decomposition mechanism and the decomposed...
Virtual Reality (VR) system is an effective experimental study tool within the areas of cognitive psychology, neurosciences and psychophysiology. In this study, a new VR system, called panorama manifestation (PM) system, was developed and it was compared with a regular desktop (DT) system for two experimental way finding tasks in terms of success rate (SR), completion time (CT), difficulty index (DI),...
The sandwich structure of dielectric-metal-dielectric (DMD) was fabricated by ion beam-assisted deposition (IAD) under the oxygen atmosphere. The optical parameters were optimized by the admittance loci analysis to show that the transparent conducting oxide (TCO) film. By designing optical thickness of every ZnO layer and controlling the process parameters such as IAD power when fabricating DMD films...
This paper presents an improved interface for eddy current displacement sensor for accurate displacement measurement of thin targets in harsh environment. Two recently proposed state-of-the-art interfaces are analyzed and experimentally verified. The experimental results confirm high level of performance: displacement measurement of a 100 um thin target; displacement range ±1.5 mm; 15 bits dynamic...
A novel high temperature silicide process using millisecond anneal is reported. Superior thermal stability, film properties (Rs, surface roughness) and low contact resistivity to n+ silicon of <; 1 Ωμm2 is demonstrated with milli-second silicide anneal which results in grain size change and potential strain incorporation resulting in overall enhanced performance.
Capacitive sensors are a good choice for sub-nanometer-resolution position measurements, but their performance is dependent on the correct alignment. Therefore, a capacitive sensor with an integrated self-alignment system has been developed which enables the use of capacitive sensors without alignment problems due to mounting and fabrication tolerance.
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