L. M. Redondo

Advanced Applications (United States)

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J. Fernando Silva

Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento

H. Canacsinh

Instituto Politécnico de Lisboa

M. T. Pereira

Energias de Portugal (Portugal)

J.C. Soares

Universidade Federal do Maranhão

Elmano Margato

Instituto Politécnico de Lisboa

Duarte Rego

Energias de Portugal (Portugal)

A. Kandratsyeu

Energias de Portugal (Portugal)

Joaquim Mendes

Instituto Politécnico de Lisboa

Jorge V. Rocha

Iscte – Instituto Universitário de Lisboa

J. Lopes

Universidade de São Paulo

Cooperative Institutions

Inserm

238

Centre National de la Recherche Scientifique

149

University College London

144

Istituti di Ricovero e Cura a Carattere Scientifico

136

Sorbonne Université

125

Assistance Publique – Hôpitaux de Paris

113

University of Milan

105

Université Paris Cité

National Hospital for Neurology and Neurosurgery

Heidelberg University

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Research Field

Multilevel High-Voltage Pulse Generation Based on a New Modular Solid-State Switch

IEEE Transactions on Plasma Science (2014)

Luis Rocha J. Fernando Silva L. M. Redondo

This paper describes a modular solid-state switching cell derived from the Marx generator concept to be used in topologies for generating multilevel unipolar and bipolar high-voltage (HV) pulses into resistive loads. The switching modular cell comprises two ON/OFF semiconductors, a diode, and a capacitor. This cell can be stacked, being the capacitors charged in series and their voltages balanced in parallel. To balance each capacitor voltage without needing any parameter measurement, a vector decision diode algorithm is used in each cell to drive the two switches. Simulation and experimental results, for generating multilevel unipolar and bipolar HV pulses into resistive loads are presented.

Marx Generator

10.1109/tps.2013.2296141

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Citations (48)

Progress on high-voltage pulse generators, using low voltage semiconductors (<1 kV), designed for plasma immersion ion implantation (PIII)

Surface and Coatings Technology (2002)

L. M. Redondo N. Pinhão Elmano Margato J. Fernando Silva

Plasma-immersion ion implantation

High Voltage

10.1016/s0257-8972(02)00113-5

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Citations (6)

Optimization Of A Mass Spectrometry Process

AIP conference proceedings (2011)

J. Lopes Francisco Alegría L. M. Redondo N.P. Barradas E. Alves

In this paper we present and discuss a system developed in order to optimize the mass spectrometry process of an ion implanter. The system uses a PC to control and display the mass spectrum. The operator interacts with the I/O board, that interfaces with the computer and the ion implanter by a LabVIEW code. Experimental results are shown and the capabilities of the system are discussed.

10.1063/1.3586058

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Citations (0)

Pulsed Electric Fields for Valorization of Platelets with No Therapeutic Value towards a High Biomedical Potential Product—A Proof of Concept

Applied Sciences (2022)

Daniela Salvador Henrique Almeida Duarte Rego Pedro Mendonça Ana Paula Sousa

Nowadays, the standard media used in clinical-scale mesenchymal stem cell (MSC) production to supply hundreds of clinical trials uses animal-derived components as supplements, which raises several health concerns. Consequently, the development of xeno-free media supplements has emerged. In the current study, the effect of pulse electric field (PEF) application to platelet concentrates (PC) with no therapeutic value for producing platelet releasates (PR) able to sustain the ability of bone marrow-MSCs (BM-MSCs) to self-renew and differentiate was tested. It was demonstrated that PEF application to PC induces platelet activation and growth factor (GF) release, namely PDGF, FGF, IGF, and TGF-β. The highest GF release was observed for TGF-β, achieving similar levels to those attained in platelet lysates (PL). BM-MSCs expanded in the presence of PR obtained by the application of PEF (7 pulses of 10 and 12.5 kV/cm) to PC (PR PEF) retained the characteristic MSC cell-surface markers, and the ability to proliferate and differentiate into osteogenic, adipogenic, and chondrogenic lineages. In this study, evidence is provided that PR PEF represents a suitable alternative to fetal bovine serum (FBS) for use in MSC production.

10.3390/app12125773

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Citations (5)

Characterization of nanostructured HfO2 films using Perturbed Angular Correlation (PAC) technique

Hyperfine Interactions (2010)

F. H. M. Cavalcante M. Ribeiro Gomes A. W. Carbonari L. F. D. Pereira D. A. Rossetto

Electric field gradient

10.1007/s10751-010-0250-z

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Citations (2)

Ion implantation of microcrystalline silicon for low process temperature top gate thin film transistors

Thin Solid Films (1999)

V. Chu Helena Silva L. M. Redondo Camila Beatriz Dantas de Jesus M.F. Silva

Microcrystalline

Photoconductivity

10.1016/s0040-6090(98)01177-8

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Citations (1)

Pulsed electric field pre-treatment for apple juice extraction: Evaluation of monopolar and bipolar pulses effects

Paulo Brito H. Canacsinh Joaquim Mendes L. M. Redondo M. T. Pereira

Additional apple juice extraction with pulsed electric field pre-treated apple cubes towards control samples is evaluated. Monopolar and bipolar shaped pulses are compared and their effect is studied with variation of electric field, pulse width and number of pulses. Variation of electric field strength is ranged from 100 V/cm to 1300 V/cm, pulse width from 20 μs to 300 μs and number of pulses from 10 to 200, at frequency of 200Hz. Two pulse trains separated by 1 second are applied to all samples. Bipolar pulses showed higher apple juice yields with all studied parameters. Calculation of specific energies consumed was assessed and a threshold where higher energy inputs do not increase juice yield is found for a number of used parameters. Qualitative parameters of total soluble matter ( ^o Brix) and absorbance at 390 nm wavelength were determined for each sample and results show that no substantial differences are found for PEF pre-treated and control samples.

Absorbance

Brix

10.1109/ipmhvc.2012.6518688

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Citations (2)

Evaluation of V2V and V2I mesh prototypes based on a wireless sensor network

José Eugenio Naranjo José G. Zato L. M. Redondo Mario Oliva Felipe Jiménez

Wireless vehicular communications have been identified as one of the most important Intelligent Transportation System technologies to be developed in the coming years, from a safety as well as an energy efficiency point of view. Several standards definitions, hardware developments, research projects, use cases definitions and field operational tests are currently under deployment in order to accelerate the market availability of this technology. Nevertheless, though the possible applications of vehicular communications are defined, there is a lack of availability of completely functional communication technology to support these applications. Issues like the adaptation of communication technologies to run in a massive high speed mobile environment, the behaviour of Vehicle Ad-hoc Networks (VANET) in multihop mesh mode or routing algorithms for reliable V2V and V2I data transmission are currently open research areas. In this paper we present an evaluation of V2V and V2I prototypes based on wireless sensor mesh networks, tested in real vehicles with real communication hardware. This paper opens up a frame to solve some of the present deficiencies of vehicular communications and enable the possibility of testing safety applications in real VANET situations.

Mesh networking

Open research

Vehicular communication systems

Vehicle-to-vehicle

10.1109/itsc.2011.6082864

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Citations (10)

Four Channel 6.5 kV, 65 A, 100 ns–100 µs Generator with Advanced Control of Pulse and Burst Protocols for Biomedical and Biotechnological Applications

Applied Sciences (2021)

A. Kandratsyeu Uladzimir Sabaleuski L. M. Redondo Andrei G. Pakhomov

Pulsed electric fields in the sub-microsecond range are being increasingly used in biomedical and biotechnology applications, where the demand for high-voltage and high-frequency pulse generators with enhanced performance and pulse flexibility is pushing the limits of pulse power solid state technology. In the scope of this article, a new pulsed generator, which includes four independent MOSFET based Marx modulators, operating individually or combined, controlled from a computer user interface, is described. The generator is capable of applying different pulse shapes, from unipolar to bipolar pulses into biological loads, in symmetric and asymmetric modes, with voltages up to 6.5 kV and currents up to 65 A, in pulse widths from 100 ns to 100 µs, including short-circuit protection, current and voltage monitoring. This new scientific tool can open new research possibility due to the flexibility it provides in pulse generation, particularly in adjusting pulse width, polarity, and amplitude from pulse-to-pulse. It also permits operating in burst mode up to 5 MHz in four independent channels, for example in the application of synchronized asymmetric bipolar pulses, which is shown together with other characteristics of the generator.

Burst mode (computing)

Pulsed Power

Microsecond

Polarity (international relations)

10.3390/app112411782

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Citations (12)

Solid-State Bipolar Marx Modulator Modeling

IEEE Transactions on Plasma Science (2014)

H. Canacsinh L. M. Redondo J. Fernando Silva Edl Schamiloglu

A mathematical model that simulates the operation of a solid-state bipolar Marx modulator topology, including the influence of parasitic capacitances is presented and discussed as a tool to analyze the circuit behavior and to assist the design engineer to select the semiconductor components and to enhance the operating performance. Simulations show good agreement with experimental results, considering a four stage circuit assembled with 1200 V isolated gate bipolar transistors and diodes, operating at 1000 V dc input voltage and 1-kHz frequency, giving 4 kV and 10-μs output pulses into several resistive loads. Results show that parasitic capacitances between Marx cells to ground can significantly load the solid-state switches, adding new operating circuit conditions.

Marx Generator

Insulated-gate bipolar transistor

Parasitic capacitance

Parasitic extraction

Resistive touchscreen

10.1109/tps.2014.2337716

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Citations (13)