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Design approach and control strategy have a significant impact on the performance of the wireless power transfer systems in electric vehicles power trains in terms of efficiency, charging power, charging modes (i.e. G2V and V2G) and charging time, etc. Thus, this paper proposes new design methodology and control system for a bidirectional 3.7 kW wireless power-transfer (WPT) of light-duty electric...
Surface acoustic wave (SAW) resonant sensors are widely used in hash environment. The sensor is detected when the response signal exceeds a threshold in frequency spectrum. Because of complicated noise and interference in wireless channel, the threshold should be adaptive in order to detect sensors accurately. An adaptive and dynamic constant false alarm rate(CFAR) threshold determination algorithm...
Wireless SAW resonant sensors have been widely used in many applications, especially in harsh environment. The sensor is detected when the echo signal spectrum processed by Fourier transform exceeds a threshold. Because of complicated noise and electromagnetic interference in wireless channel, the threshold should be adaptive to interference in order to detect the sensor accurately. However, few researches...
The focused ultrasound (FUS) systems are widely used due to their ability to generate a tight and intense focal region from a distributed source for the non-invasive and safely detection. However, these devices usually require elaborate arrays of a rather complex and cumbersome set of transducers. Holographic techniques are fundamental to applications such as volumetric displays and tweezers. The...
In this paper, for any given prime power q, using Helleseth-Gong sequences with ideal auto-correlation property, we propose a class of perfect sequences of length qm−1/q−1. As an application, a subclass of constructed perfect sequences is used to design optimal and perfect difference systems of sets.
In this paper, a novel sequence design algorithm under spectrum hole constraint is proposed which generates sequences resilient to time delays and Doppler shifts. In practical applications, it is desirable to have sequences with not only low ambiguity function (AF) in certain delay-Doppler region, but also low peak-to-average power ratio (PAPR). The proposed algorithm combines energy gradient method...
Semi-bent functions have very high nonlinearity and hence they have many applications in symmetric-key cryptography, binary sequence design for communications, and combinatorics. In this paper, we focus on studying the additive autocorrelation of semi-bent functions. We provide a lower bound on the maximum additive autocorrelation absolute value of semi-bent functions with three-level additive autocorrelation...
In this paper, we present a new method of constructing Z-complementary pulse trains from sequences with property of Equal Sums of (like) Powers (called ESP sequences) which are resilient to Doppler shifts. Numerical experiments indicate that the proposed Z-complementary pulse trains obtained from ESP sequences have better Doppler resilience than waveforms constructed from the well-known Prouhet-Thue-Morse...
Some methods to enhance penetration depth further are proposed and demonstrated. A second harmonics SPUDT, new criterion of matching and high reflectivity reflector are utilized to reduce the losses of SAW tag. The enhancement of reading system including high signal processing gain and compensate the center frequency mismatch between reader and SAW tag are achieved. Furthermore, the effect of decreasing...
User Experience (UX) of virtual reality games is usually measured by subjective and objective methods: subjective methods are most convenient way to rating usability, comfort, satisfactory, etc., however, subjective methods are more easily to be misguided. Eye tracking is one of the most popular objective methods to measure usability. However, when wearing a VR helmet, eye tracker is hard to use to...
It has been observed through animal and cell experiments that terahertz electric pulse irradiation can modulate physiological processes of nerve system. However, the regulation mechanism is unclear and the corresponding research is rarely reported in the literatures. This paper simulates the voltage-activated calcium flux of rodent neuroblastoma cells under the irradiation of 50ps, 2.5THz electric...
Terahertz technology shows great potential in the field of biology and medicine. In order to study the impact of terahertz electrical field on the KcsA membrane protein system at the molecular level, we perform molecular dynamics (MD) simulations to simulate this process. Two kinds of waveforms are chosen, sine wave and square wave. The frequencies are respectively 0.5T, 1T, 2T and 3T. We compare...
We study the feasibility of dispersion compensated terahertz quantum cascade lasers combs operating around 2.65–2.95 THz to perform multiheterodyne spectroscopy. The devices show short-term intermode beat note frequency drift after 30 μs, which indicates that reliable multiheterodyne spectroscopy over extended time-scale requires phase and timing correction to allow for coherent averaging.
Horizontal oil-water two-phase flow is widely encountered in power plants, chemical engineering and petroleum industry. Understanding the flow characterization of horizontal oil-water two-phase is significant to uncover the flow mechanics underlying oil-water flow, which will facilitate the safety design and optimization of the process engineering and facilities. Oil-water two-phase flow experiments...
Rank deficiency issues dictate that parameter identification for permanent magnet synchronous motor (PMSM) must be a step by step procedure. In this paper, the influence of parameter identification sequence to identification accuracy is analyzed and an off-line and on-line combined sequence is assessed to be the optimal sequence for improving the accuracy of resistance and flux identification. Overall...
Digital predistortion (DPD) is an effective power amplifier (PA) linearization technique improving the system energy efficiency. At this point, real-time DPD adaptation is still an open issue due to the high computational complexity during the coefficients estimation procedure. Online censoring approach, which is effective in reducing the redundant data samples, can be applied in the DPD coefficients...
The standard core protocol of Narrow Band Internet of Things (NB-IOT) was approved by the RAN plenary session in June 16, 2016. Global operators have a standardized IOT proprietary protocol. The successful completion of the standardization work also marks that the NB-IOT has entered the commercial stage. Modern wireless communication equipment must accommodate high power transmitter and high sensitivity...
With the rapid development of Internet of things, Wireless Sensor Networks (WSN) has received growing interests. As the virtual backbone of WSN, connected dominating set (CDS) plays an important role in supporting data communication, reducing routing overhead and enhancing the scalability of the network. Attribute to the rapid development of microprocessor and electronic technology, communication...
Field electron emission patterns emitted from few-layer graphene with different edge morphology were investigated using field emission microscopy (FEM). The FEM image of few-layer graphene was observed as a “lantern”, which is composed of light and dark fringes. The relationship between graphene edge morphology and field emission pattern was investigated using a emission electron spatial interference...
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