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This paper deals with the adaptation, the tuning and the evaluation of the multiple organs Optimal Surface Detection (OSD) algorithm for the T2 MRI prostate segmentation. This algorithm is initialized by first surface approximations of the prostate (obtained after a model adjustment), the bladder (obtained automatically) and the rectum (interactive geometrical model). These three organs are then segmented...
Lithium titanate battery suffers from high capacity fade for elevated temperature operation. In order to gain new insights into the underlying degradation mechanism of this problem, Li4Ti5O12/LiCoO2 battery with 8Ah capacity was assembled and its storage and cycling performance at 60°C were investigated. Electrochemical impedance spectroscopy (EIS) of cells during cycling were measured with two-electrode...
Generalized synthesis method is proposed and developed for tunable and reconfigurable filters with flexible frequency and bandwidth response characteristics, which includes center frequency tuning, bandwidth tuning, and bandpass to band-stop reconfiguration. Theoretical representation of the effects of tuning elements that are used to tune filters in terms of coupling matrix formulation is also demonstrated...
In this paper, a novel fast recursive dynamic sliding control method based on extended state observer is proposed for dual-motor servo system with backlash nonlinearity. The extended state observer is improved by introducing a new nonlinear function to avoid high-frequency oscillation and simplify the designing process. Then, a fast recursive dynamic sliding controller is designed, which can make...
In this paper, a universal and efficient algorithm of domain decomposition finite difference time domain (DD-FDTD) is presented for the analysis of electromagnetic fields and microwave structures. The proposed algorithm can not only be used to analyze very complicated microwave structures but also be used to analyze sparse multi-domain electromagnetic fields. The algorithm can greatly increase the...
The design of complex substrate integrated waveguide (SIW) circuits requires the use of sophisticated full-wave simulation tools. When the complexity of the circuit increases, the computational effort required for the analysis and especially for the optimization of complex SIW circuits becomes prohibitive. For this reason the use of equivalent circuit models is very beneficial. This paper presents...
This paper describes how the newly discovered building blocks of the field of Spintronics can be used for nonlinear RF applications. Recent advances in Spintronics are first put into context of the electric charge manipulation (field of electronics). It is reminded how Spintronics devices such as Magnetic Tunnel Junction (MTJ) are relevant in microwave engineering. A brief description of the MTJ technology...
A triple-mode substrate integrated waveguide (SIW) resonator is presented in this letter. Same square slots are etched on the double sided surface center of a SIW square cavity. With the aid of proper slot size selection, the resonant frequency of the dominant mode gets close with that of the second-order resonant mode. The triple-mode bandpass filter based on this resonator is then designed. The...
Two new interconnects between coplanar waveguide (CPW) and substrate integrated waveguide (SIW) are introduced and studied. Contrary to previously published interconnects, the new ones are shorter and require less space on the printed-circuit board. Thus they are ideally suited for dense packaging and integration. The first one is a regular interconnect that runs the slots of the CPW directly into...
In this paper, a structure of dual diode microstrip rectifier circuit operating at 35 GHz capable of harmonic harvesting is proposed to improve the RF-to-DC conversion efficiency. To do so, the conventional voltage doubler is first modified for 35 GHz operation. Then, a harmonic harvesting rectifier is designed and optimized in order to maximize the RF-to-DC conversion efficiency. Both circuits are...
In this work, a concept for designing two dimensional scan circularly polarized antenna array is introduced for advanced millimeter-wave imaging and sensing systems. Three-dimensional (3-D) integrated architecture of circularly polarized (CP) antenna system is studied, realized and demonstrated in substrate integrated waveguide (SIW) technology. Axial ratio bandwidth of a well-known slot antenna is...
Air-filled Substrate Integrated Waveguide (SIW) based on multilayer Printed Circuit Board (PCB) process is proposed in this paper for millimeter-wave applications that require low cost, high performances and compactness. This air-filled SIW allows for substantial loss reduction and power handling enhancement. Its fabrication involves three layers. The top and bottom substrates can consist of a low...
A diplexer-based harmonic feedback-loop oscillator concept is presented and demonstrated at 5.8GHz. Without additional complexity, the diplexer together with an RF amplifier creates isolation between nonlinear feedback-loop dynamics and second harmonic signal component that is directed to the output. As a result, the load pulling effect is reduced as well as the phase noise performance is improved...
The concept and design of terahertz (THz) digital phase shifter based on graphene Gate-controlled Switchable Devices (GSD) with Defected Ground Structures (DGS). It is shown that the graphene based Unit Phase Shifter (UPS) may enable viable applications of gate controlled switchable devices for THz wideband antenna systems with considerable advantages while integrating with external circuits. Since...
Two port resonant isolators are more compact and cheaper than circulator, but necessitate high magnetic bias. A new SIW-based isolator is proposed here. Using the ferrite slab mode, which enable operation at lower magnetic bias, an isolation of about 40dB with reasonable insertion losses were achieved. Operation at higher temperature is then analyzed, showing the effects on the performance of the...
The modeling and design of substrate integrated waveguide (SIW) circuits requires sophisticated electromagnetic solvers, which provide reliable results, fast computing time, and high flexibility to fully exploit the potential of SIW technology. This paper presents the outline of the full-wave analysis of SIW circuits by the Boundary Integral-Resonant Mode Expansion (BI-RME) method. In addition, the...
The design, simulation, optimization and experimental demonstration of an electro-optic SiO2-CBN-MgO rib waveguide structure are reported in this paper. The proposed structure is modeled and optimized by simulations. CBN thin film is deposited epitaxially by a pulsed laser deposition technique. The CBN rib waveguide structure is patterned using plasma etching. The fabricated waveguides are characterized...
This paper considers the dynamics of an N-players Cournot game with quadratic dynamical system for stochastic output adjustment of firms. For each output adjustment, the firms can apply 3 strategies: increasing, decreasing or maintaining their last output based on their naive expectation and adaptation judgement. We concentrate on the transition process from non-equilibrium state to the equilibrium...
Aggregation is widespread in the nature, and mutual benefit is considered as an important factor causing it. An agent-based model is proposed to demonstrate emergence of aggregations in a self-organized system, in which agents move according to their corresponding benefits obtained from interactions. The concept of entropy is introduced as a measure of aggregation degree of the system, and how the...
Harmonic radar architectures present systems of wireless detection operating at multiple harmonic carrier frequencies. The noise and sensitivity of a harmonic radar system, which is developed at 12 GHz and 24 GHz for vital signs detection, are studied numerically and experimentally. The received signal power of the radar system is analyzed numerically as a function of the distance, taking into account...
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