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Vernier Permanent-magnet machine (VPMM) has been recognized in recent years as a substitute for permanent magnet synchronous machines (PMSM) in direct-drive applications such as wind turbine generators, motorcycles and electric vehicle/hybrid electric vehicle (EV/HEV) [1].
There has been persistent exploration of new active materials and novel device architectures to dynamically control light with larger modulation depth and increased spectral range, at faster speed, and using less power. In this presentation, I will present experimental results showing that samarium nickelate (SmNiO3), a prototypical phase-change perovskite nickelate, exhibits reversible large refractive...
The surface states of topological insulators (TI) possess a linear dispersion in the low-energy approximation, and are protected against time-reversal-invariant perturbations such as non-magnetic impurities, defects [1-3]. The chiral nature of TI surface states can induce perfect quantum tunneling for Dirac fermions incident in the normal direction, which can be utilized in some novel TI-based devices...
Geometric effects are investigated in a modulated two-section semiconductor laser. The study includes numerical solutions of the traveling-wave equations, a new analytical treatment using delay-differential equations, and the experimental characterization of quantum-dot lasers.
Different from the existing main-circuit topologies of the HVDC converters, this paper presents a class of improved converter structures constructed by Inductive Filtering (IF) method, which can be used to further construct different HVDC transmission modes. Firstly, the basic operating principle and the technical characteristics of the IF method based HVDC converter is theoretically analyzed. Then,...
Previous work on cooperative MAC design has shown significant performance improvement in terms of throughput and packet delivery ratio. However, little attention has been paid to extra energy cost at the relay node in order to achieve such benefit. In this paper, we focus on analyzing energy consumption at a relay node in cooperative retransmission networks with mixed Rayleigh and Rician fading channels...
In this paper, we evaluate the communication quality, energy consumption and bandwidth of different transmitters with different modulation schemes. The performance in short distance communication, for instance wireless personal area network (WPAN), is evaluated. Simulation results demonstrate that for WPAN communication, the transmitter with high modulation level PSK and a linear class A power amplifier...
The impact of device temperature variations on the modulation response of an injection-locked Quantum-Dash laser is analyzed. Lower slave operating temperatures result in a large reduction in the undesirable pre-resonance dip in the modulation response.
In this paper, we evaluate the communication quality, energy consumption and bandwidth of different transmitters with different modulation schemes. The performance in wireless personal area network (WPAN) is evaluated. Simulation results demonstrate that for WPAN communication, the transmitter with high modulation level PSK and a linear class A power amplifier can acquire higher spectral efficiency...
We consider a heterogeneous multiuser OFDM wireless network serving both QoS constrained high-priority users and best-effort users. We investigate resource allocation to maximize the total network utility by specifying two different utility functions for the two user classes. Our strategy is to first maximize the number of satisfied high-priority users before allocating the remaining resource among...
Tins paper presents the comparison of signal quality and efficiency performance between simulation and experiment for a linear RF transmitter based on a hybrid quadrature polar modulation (HQPM) architecture with digital predistortion scheme. Adjacent channel power ratio (ACPR) with and without applying the baseband predistorter are both shown to demonstrate improvement in transmitter linearity. The...
Directly-modulated quantum dot lasers showed that the highest relaxation frequency decreases monotonically with the p-doping level from 5.3 GHz (undoped wafer), to 4.6 GHz (20 holes/dot), 3.8 GHz (30 holes/dot) and 3.6 GHz (40 holes/dot).
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