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Interior permanent magnet motors with ferrite magnets and distributed windings can be a cost effective alternative to rare-earth magnet based motors for demanding applications such as automotive traction. Among different rotor topologies, the spoke type may be preferred, due to its advantages for high flux concentration and resistance to demagnetization, when carefully designed. When high speed operation...
That oil spills are quickly reliably detected and the oil spill information is distributed to related users or emergency responders in real-time is very important in oil spill response and contingency planning. Laser Fluorosensors, such as the Scanning Laser Environmental Airborne Fluorosensor (SLEAF) sensor operated by Environment Canada, are among the most appropriate sensors for oil spill surveillance...
This paper presents the design, development and implementation of a Hybrid Adaptive Fuzzy Controller (HAFC) suitable for real-time industrial applications. The developed HAFC consists of a weighted combination of the Direct Adaptive Fuzzy Controller (DAFC) and Indirect Adaptive Fuzzy Controller (IAFC) and a gradually activated supervisory controller. The unique feature of the HAFC is that no mathematical...
This paper presents a new approach, which exploits the recently developed Dynamic Fuzzy Neural Networks (DFNN) learning algorithm. The DFNN is based on extended Radial Basis Function (RBF) neural networks, which are functionally equivalent to Takagi-Sugeno-Kang (TSK) fuzzy systems. The algorithm comprises 4 parts: (1) Criteria of rules generation; (2) Allocation of premise parameters; (3) Determination...
Mechanically-flexible lasers made of thin-films of colloidal quantum dots on glass membranes are reported. These ns-pulsed lasers have 0.5mJ/cm2 (100 kW/cm2) thresholds and are wavelength-tunable across 18 nm. Improvements of CQD-laser materials are also studied.
Power transformer is an important equipment to transport and deliver the electric energy in the power system. It will result in huge damage of national economy while the transformers break down. On-line monitoring the dissolved gases in oil is one of the effective methods to improve the security and reliability of the power system. CO is the one of main failure characteristic gases in the transformer...
In the past decades, the application of nanostructures and nanotechnology has attracted intensive attention in many fields from electronic devices to chemical sensors. The monitoring of toxic or inflammable gases has been increasingly important for humans, environment and various areas. In the power system field, power transformers are important equipment of electricity transmission and distribution,...
In this work, epoxy based nanocomposites was prepared to investigate the effect of relative humidity on surface dielectric breakdown under repeated pulses. Two kinds of inorganic nano particles, i.e. silica and alumina, were used as fillers. The experiment was carried out at room temperature with relative humidity varied from 50% to 90%. A pair of needle-plate electrodes that was tightly pressed on...
In the course of our study on the frequency dependence of dynamic positive-bias temperature instability (PBTI) in the HfO2/TiN gate n-MOSFET, an unexpected result was obtained. In accordance with our recent study, electron trapping is observed to gradually evolve into a more permanent form, suggesting that some shallow electron traps are converted into deeper ones as the PBTI stress progresses. Interestingly,...
By modifying the summation selection criteria and using the non-uniform power distribution profile, a further reduction in the complexity of implementing the perturbation-based nonlinear pre-compensation algorithm for a 128 Gb/s DP 16-QAM signal is demonstrated.
ISI-free polynomial pulses are considered for mitigating intra-channel nonlinearity for a 128 Gb/s DP 16-QAM system. A maximum transmission distance of 4500 km is achieved offering a 25% reach extension relative to root-raised-cosine pulses.
Transmission of a single-carrier 448 Gb/s dual-polarization 16-QAM signal is demonstrated using fixed look-up table based maximum-a-posteriori detection at the receiver to mitigate pattern-dependent distortion in the transmitted signal arising from the high baud rate.
The microfabrication technology of MEMS has been successfully applied in the field of micropropulsion for micro/nano satellites. Among various types of MEMS micro thrusters developed so far, vaporizing liquid microthruster (VLM) has been widely explored for its ability to produce continuously variable thrust in the micro-Newton (μN) to milli-Newton (mN) range. VLM is a micromachined chamber which...
Converter transformer plays an important role in the HVDC transmission system. The valve side winding insulation in converter transformer withstands polarity reversal voltage during operation. In order to investigate the effect of polarity reversal electric field on flow electrification in converter transformer, an oil/pressboard tube model with concentric cylindrical electrode geometry was built...
In order to study the breakdown characteristics of oilpaper insulation under compound electric field, the typical oil-pressboard insulation model was adopted according to the insulation structure in converter transformer. The electric field in oil and oil-impregnated pressboard was simulated according to the equivalent circuit for the above model, and the breakdown characteristic test for typical...
This paper addresses the problem of detecting obstacles that protruding from the road. Traditionally, the road surface has been considered flat, and camera orientation is fixed. However, both assumptions are not strictly true in urban scenarios. The proposed algorithm employs a time-of-flight (ToF) camera. It allows dynamic pitch/roll angles, height variations and represents the ground as a quadratic...
The nanosecond lasing performance of core-shell and alloyed CdSe/ZnS colloidal quantum dots is reported. Low amplified spontaneous emission and laser oscillation thresholds of 0.55mJ/cm2 and 0.9mJ/cm2 are demonstrated for, respectively, thin-films and distributed-feedback cavity structures.
In this paper, the change in partial discharge resistance of low density polyethylene and epoxy resin irradiated with γ-ray at high dose rate has been investigated. The samples were irradiated in air up to 100 kGy then up to 1000 kGy by means of a 60Co γ-source at a dose rate of 10 kGy/h. By applying an AC voltage of 8 kHz between a pair of needle-plane electrode, partial discharge was generated to...
Finding the location of a fault in code is an important research and practical problem, which often requires much time and manual effort. To automate this time consuming task, a class of predicate-based statistical fault localization techniques have been proposed, which test the similarity of dynamic predicate spectra between non-failed runs and failed runs and suggest suspicious predicates to the...
By combining symmetric electronic dispersion compensation and root-raised-cosine pulse shaping with a roll-off factor of 0.1, the complexity of perturbation-based nonlinear pre-compensation for 128 Gbit/s DP 16-QAM is reduced by a factor up to 6.8 without a degradation in performance.
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