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A FPGA dedicated processor for the digital processing of the acquired signal in electrical capacitance tomography systems is presented. The objective of this IP core is to generate an adaptable and portable prototype which is meant to work with the acquisition electronics, i.e., this whole system offers an instrument suitable to be easily transported and applied to different ECT sensors and scenarios...
An integral robust observer with rejection control disturbance is proposed in this paper. The design of the observer is performed employing the canonical obervable model of the original non-linear system, obtained by a change of coordinates. A practical stability is proved using the Lyapunov approach with using a high gain to maintain the solution in a convergence ball. Several simulations cases are...
To interrupt a current in a DC system where the feeding voltage is higher than a few kilovolt is a challenge. One popular solution today is the hybrid DC-breaker where a semiconductor is bypassed by a mechanical switch in normal operation to decrease the on-state losses. This paper presents an experimental study of the commutation from the mechanical switch to a parallel diode and IGBT. Three sets...
One of the main disadvantage of the synchronous machines with brushless excitation is that the field winding is not accessible for the de-excitation. The de-excitation process is very slow as the field current flows through the rotating diodes which operate in freewheel mode. Therefore in case of an internal fault, despite the correct operation of the protection relays, the machine could have severe...
Using quantum transport simulations the effect of confinement in GaAs and InGaAs gate-all-around (GAA) nanowire field effect transistors (NWFETs) of different dimensions has been investigated. NWFETs of two cross-sections: 2.2x2.2 nm2 and 4.2x4.2 nm2 and three channel lengths: 6 nm, 10 nm and 20 nm have been simulated. The Non-Equilibrium Green’s Function (NEGF) formalism in the effective mass approximation...
Paraboloid antenna telescopes have been used for the last 70 years to perform radio astronomy observations and their main characteristics are well known. Over the years, telescopes operated at a given facility are often modified or upgraded with new feeds or support struts, or see their immediate surrounding environment modified. The gain of such instruments needs therefore to be measured to account...
Beam polarimetry is a versatile tool in optical technology enabling the measurement of the light polarization state. In this work, we demonstrate an on-chip polarization analyzer working at telecom wavelengths that allows for a direct measurement of the Stokes parameters of an incoming plane wave. The analyzer consists of three silicon nanoantennas coupled to three waveguides (having six outputs)...
In this paper, I briefly discuss the benefits of introducing recent concepts arisen from metamaterials, plasmonics and nanoantennas fields on a silicon photonics integrated platform. This could lead to the improvement of photonic integrated circuits as well as to disruptive applications in photonics.
Spin-orbit coupling enables highly directional scattering of light from a particle by controlling the incident polarization. We propose using polarized illumination to induce lateral scattering, associated with a lateral electromagnetic momentum, and therefore accompanied by an unusual recoil force (equal and opposite mechanical momentum) that can be switched with the polarization, with no field gradients,...
The prediction of paroxysmal atrial fibrillation (PAF) onset is an interesting clinical challenge, because the chronification of this highly prevalent arrhythmia could be avoided. Recently, the quantification of the P-wave duration variability over time has revealed a promising ability to detect accurately the onset of PAF. However, the possible scale-dependent variations in this P-wave variability...
A novel layout for an imaging system able to create real time radar images for personnel security screening is presented. The system uses multiple mm-wave transmitters and receivers placed along a hallway in a multistatic configuration. The layout consists of two flat panels of receivers placed on opposite walls. Transmitters are located around the hallway to provide multiple illumination angles....
This paper presents a novel single-transceiver compressive reflector antenna for high-capacity sensing and imaging applications. The compressive antenna generates a spatial code in the imaging region, which is dynamically changed by using a mechanical rotation of the reflector. The scattered data measured by the single transceiver is processed using Compressive Sensing techniques in order to perform...
The application of statistics and mathematics over large amounts of data is providing healthcare systems with new tools for screening and managing multiple diseases. Nonetheless, these tools have many technical and clinical limitations as they are based on datasets with concrete characteristics. This proposition paper describes a novel architecture focused on providing a validation framework for discrimination...
The FP7 project TeraSCREEN is focused on the development of a multi-frequency multi-mode Terahertz (THz) detection prototype for security screening. In this paper the passive subsystem antenna array is presented which consists of standard gain horn antennas, a waveguide manifold in order to reduce the antenna separation and improve the array resolution and compact waveguide twists required to change...
The ancestral progenitors of quinoa have originated in North America, but quinoa production and the culture that developed alongside its cultivation and consumption is known to be shared among the ancient peoples of South America. The domestication process must have included all factors of the domestication syndrome, including larger fruit size, higher and uniform yields, reduced branching and bigger...
This paper describes a novel norm-one-regularized, consensus-based imaging algorithm, based on the Alternating Direction Method of Multipliers (ADMM), that can be used by a high-sensing-capacity Compressive Reflector Antenna (CRA). The proposed method outperforms current state of the art iterative reconstruction algorithms in terms of computational cost; and it ultimately enables the use of a CRA...
Current state-of-the art active millimeter wave radar systems for personnel inspection are based on monostatic or quasi-monostatic configurations that can misrepresent areas of the target when the specular reflection is oriented away from the incident direction. This paper analyzes a fully multistatic mm-wave imaging architecture for human body screening. Transmitters placed off the receiving aperture...
Ground penetrating radar (GPR) is a viable tool for fast and high fidelity subsurface identification of buried landmines and improvised explosive devices (IEDs). The greatest barrier in GPR surveying systems is the obscuring effect of rough surface clutter. The finite difference frequency domain (FDFD) method can be used to calculate the scattering of the rough terrain. A full 3D FDFD analysis is...
This paper presents a model for a MV/LV bidirectional solid state transformer (SST) for distribution system studies. A multilevel converter configuration is used in the MV side for voltage and current harmonic reduction. The model has been implemented in the ATP version of the EMTP. Several case studies have been carried out in order to evaluate the behavior of the SST model under different operating...
An integrated portfolio of wide-area real-time reliability tools is addressing one of the major recommendations from the most recent blackouts in North America's Eastern and Western interconnections: The lack of common, simultaneous, adequate and accurate reliability information during major disturbances. The functional specifications for the tools were defined through guidance provided by NERC reliability...
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