Search results for: J. Fariña

Items from 1 to 20 out of 47 results

article

Effectiveness of an Asynchronous Online Module on University Students’ Understanding of the Bohr Model of the Hydrogen Atom

William J. Farina, Alec M. Bodzin

Journal of Science Education and Technology > 2018 > 27 > 3 > 256-269

Web-based learning is a growing field in education, yet empirical research into the design of high quality Web-based university science instruction is scarce. A one-week asynchronous online module on the Bohr Model of the atom was developed and implemented guided by the knowledge integration framework. The unit design aligned with three identified metaprinciples of science learning: making science...

chapter

Optimiller: An Interactive Environment that Helps Students in the Understanding, Design and Optimization of Miller Electronic Oscillator Circuits for QCM Sensors

L. Rodríguez-Pardo, J. Fariña, C. Gabrielli, H. Perrot, more

IFIP — The International Federation for Information Processing > EduTech Computer-Aided Design Meets Computer-Aided Learning > E-Learning in System Design > 77-87

The quartz crystal oscillator used as mass sensor in damping media suffers significant losses implying the need to adapt the oscillator design to compensate them. In this paper, a CAD tool to help students in the understanding, design and optimization of Miller oscillators for the realization of high sensitivity quartz crystal microbalance (QCM) sensors for liquid media is presented. This tool is...

chapter

Increasing digital investigator availability through efficient workflow management and automation

Ronald In de Braekt, N-A. Le-Khac, J. Farina, M. Scanlon, more

2016 4th International Symposium on Digital Forensic and Security (ISDFS) > 68 - 73

2016 4th International Symposium on Digital Forensic and Security (ISDFS)

The growth of digital storage capacities and diversity devices has had a significant time impact on digital forensic laboratories in law enforcement. Backlogs have become commonplace and increasingly more time is spent in the acquisition and preparation steps of an investigation as opposed to detailed evidence analysis and reporting. There is generally little room for increasing digital investigation...

chapter

Optimiller: An Interactive Environment that Helps Students in the Understanding, Design and Optimization of Miller Electronic Oscillator Circuits for QCM Sensors

L. Rodríguez-Pardo, J. Fariña, C. Gabrielli, H. Perrot, more

IFIP — The International Federation for Information Processing > EduTech Computer-Aided Design Meets Computer-Aided Learning > E-Learning in System Design > 77-87

chapter

Induced transparency in double-ring photonic switches for optical Networks-on-Chip

S. Mingaleev, E. Sokolov, A. Richter, I. Koltchanov, more

2014 IEEE Avionics, Fiber-Optics and Photonics Technology Conference (AVFOP) > 29 - 30

2014 IEEE Avionics Fiber-Optics and Photonics Conference (AVFOP)

We studied the properties of 2×2 photonic switching elements made of two intersecting waveguides coupled with two micro-rings and showed that they can exhibit the effect of coupled-resonator induced transparency (CRIT). Employing the CRIT effect promises reduction of power consumption compared to standard switching techniques, and thus, the potential of utilizing a fast (but weak) electro-optic effect...

article

Temperature compensation of QCM sensors in liquid media

A. Cao-Paz, L. Rodriguez-Pardo, J. Fariña

Sensors and Actuators B: Chemical > 2014 > 193 > C > 78-81

This work presents thermal characterization and compensation of a quartz crystal microbalance sensor for the determination of the state-of-charge of lead acid batteries. The concentration of sulfuric acid in the electrolyte changes significantly with the battery state-of-charge. However, changes in the temperature of the electrolyte take place during the operation of the battery, to which the resonant...

article

Electrolyte Uptake Kinetics in Doped and Undoped sol-gel Films Using a High Resolution EQCM Oscillator Sensor

L. Rodriguez-Pardo, C. Perez, A. Cao-Paz, J. Fariña, more

Procedia Engineering > 2014 > 87 > Complete > 212-215

The electrolyte uptake kinetics in hybrid sol–gel films was monitored with an electrochemical quartz crystal microbalance (EQCM) oscillator sensor, focused on the effect of particles addition in the film. Undoped and zinc oxide doped sol-gel coatings were immersed in a 0.1M NaCl solution to reproduce seafood environment with the object of study their performances as anti-corrosion coatings for the...

chapter

Simultaneously measurement of frequency shift and series resistance changes of a quartz resonator using a miller QCM oscillator

Loreto Rodriguez-Pardo, A Cao-Paz, J Farina

2011 IEEE SENSORS Proceedings > 1054 - 1057

2011 IEEE Sensors

In this work it is shown that a Miller quartz crystal microbalance (QCM) electronic oscillator circuit can be used to simultaneously measurement of the resonant frequency shifts and changes in the motional resistance of the resonator. In order to calibrate the sensitivity to variations in the series resistance of the resonator, an experiment was carried out with the resonator immersed in liquids at...

article

O6.3 Cross-cultural adaptation and validity of the Body Image Quality of Life Inventory (BIQLI) to be used with Brazilian burned patients

A. Rossi, O. Assunção, N. Gonçalves, R. Dantas, more

Burns > 2011 > 37 > Supplement 1 > S4-S5

chapter

Passive QCM sensor system for monitoring of water absorption and drying in Nafion® polymer membranes

E A Bustabad, G García-Martinez, H Perrot, C Gabrielli, more

IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society > 1293 - 1297

IECON 2010 - 36th Annual Conference of IEEE Industrial Electronics

This work deals with the development of a Passive Quartz Crystal Microbalance (QCM) Sensor system for liquid environment to follow the water uptake and drying characteristics of Nafion^® polymer membranes. An automated system for the electro-acoustic characterization of a quartz crystal resonator using an impedance analyzer was designed and implemented. The developed system allows carrying out in situ...

chapter

Dynamic events in optical networks - emulation and performance impact analysis

A Richter, H Louchet, I Koltchanov, N Karelin, more

2010 - MILCOM 2010 MILITARY COMMUNICATIONS CONFERENCE > 885 - 889

2010 Military Communications Conference (MILCOM 2010)

We present a framework for emulating dynamic network events and investigating the corresponding performance impact with a two-step approach consisting of parametric modeling of slowly varying effects and detailed bit-level simulations and discuss various application examples.

article

Ingress of water into organic coatings: Real-time monitoring of the capacitance and increase in mass

A. Cao-Paz, A. Covelo, J. Fariña, X.R. Nóvoa, more

Progress in Organic Coatings > 2010 > 69 > 2 > 150-157

Water ingress into a cataphoretic coating employed in the car industry was studied using real-time mass and capacitance measurements. The results showed the presence of three well-differentiated time constants associated with the process. The corresponding time scales were 2–3min, 1 and 10h. The first time constant (fastest process) was assumed to be associated with the filling of surface pores by...

chapter

Analysis of two FPGA design methodologies applied to an image processing system

L Costas, P Colodrón, J J Rodriguez-Andina, J Fariña, more

2010 IEEE International Symposium on Industrial Electronics > 3040 - 3044

2010 IEEE International Symposium on Industrial Electronics (ISIE 2010)

The continuous advancements in programmable device technologies enable the widespread use of FPGAs in an increasing number of industrial applications. The availability of powerful software design tools is a fundamental requirement to take advantage of the many advanced and specialized resources included in the latest devices. Although such tools exist, they are still far from guarantee first-time-optimized...

article

Water uptake kinetics in anti-corrosion organic films with a high resolution microbalance oscillator sensor

L. Rodriguez-Pardo, A. Cao-Paz, J. Fariña, A. Covelo, more

Sensors & Actuators: B. Chemical > 2010 > 144 > 2 > 443-449

In this paper, a stable quartz crystal oscillator sensor for measuring the water uptake in organic coatings is presented. The phase noise performance of the oscillator is investigated in order to characterize the oscillator's resolution during the water uptake process. The result is a quartz crystal microbalance (QCM) sensor able to determine the rate and amount of water absorbed into anti-corrosion...

article

Application of the QCM in lead acid batteries electrolyte measurements

A. Cao-Paz, L. Rodríguez-Pardo, J. Fariña

Procedia Engineering > 2010 > 5 > Complete > 1260-1263

This paper describes the application of a Quartz Crystal Microbalance (QCM) sensor in density-viscosity measurements of the electrolyte of the lead acid batteries. In battery applications, especially in automotive applications, submarines and remote communication systems it is necessary to know the state of charge of the batteries in order to manage them efficiently [1]. One of the physical parameters...

chapter

FPGA-based direct resistance and capacitance measurements

L. Ares, J.J. Rodriguez-Andina, J. Farina

2009 35th Annual Conference of IEEE Industrial Electronics > 2837 - 2841

IECON 2009 - 35th Annual Conference of IEEE Industrial Electronics (IECON 2009)

This paper presents a system that allows the measurement of some electrical parameters (namely resistance and capacitance) to be carried out through the direct connection of the target component to an FPGA, without the need for an analog-to-digital converter or excitation circuits. The system is based on a measurement method previously described in the literature, in which sensors are directly connected...

chapter

Design and implementation of a DNA biosensor based on a 50MHz QCM electronic oscillator circuit

G. Garcia-Martinez, E.A. Bustabad, H. Perrot, C. Gabrielli, more

2009 35th Annual Conference of IEEE Industrial Electronics > 1829 - 1834

IECON 2009 - 35th Annual Conference of IEEE Industrial Electronics (IECON 2009)

This work deals with the design and implementation of a 50 MHz Quartz Crystal Microbalance (QCM) Oscillator Electronic Circuit for its use as high sensibility DNA biosensor. The designed QCM oscillator sensor is able to detect the presence of complementary DNAs in a solution that match the sequence on a given strand in function of the changes in the output frequency of the oscillator. The design is...

chapter

A FPGA-based frequency measurement system for high-accuracy QCM sensors

M.D. Valdes, I. Villares, J. Farina, M.J. Moure

2008 34th Annual Conference of IEEE Industrial Electronics > 1707 - 1712

IECON 2008 - 34th Annual Conference of IEEE Industrial Electronics Society

This paper proposes the design and implementation of a FPGA-based frequency measurement system for Quartz Crystal Microbalance (QCM) sensors. Using different design techniques a bandwidth of 40 MHz and a resolution of 0,05Hz is achieved. This work is part of a bigger project focused on the development of a standalone QCM system for the analysis and characterization of different paints. Two methods...

chapter

FPGA-based design, implementation, and evaluation of digital sinusoidal generators

M. Herrero, J.J. Rodriguez-Andina, J. Farina

2008 34th Annual Conference of IEEE Industrial Electronics > 2459 - 2464

IECON 2008 - 34th Annual Conference of IEEE Industrial Electronics Society

This paper presents an FPGA-based environment for the design, implementation and evaluation of systems aimed at the direct digital synthesis (DDS) of sinusoidal waveforms. The environment consists of an FPGA-based implementation platform and a software tool which allows the characteristics and performance of DDS systems to be evaluated, both before and after their implementation. The experimental...

chapter

Monitoring of water uptake in anti-corrosion organic coatings using a quartz crystal oscillator sensor

L. Rodriguez-Pardo, A. Cao-Paz, J. Farina, A. Covelo, more

2008 34th Annual Conference of IEEE Industrial Electronics > 1760 - 1764

IECON 2008 - 34th Annual Conference of IEEE Industrial Electronics Society

Water absorption is an essential parameter to define the protection properties of anticorrosive paints. This parameter is often evaluated by means of the dielectric capacitance of the coating. The presence of water in the coating increases its dielectric constant. The semi-empirical Brasher-Kinsgbury equation [1] allows the estimation of a coatingpsilas water uptake through capacitance measurements...

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INFONA - science communication portal

Search results for: J. Fariña

Effectiveness of an Asynchronous Online Module on University Students’ Understanding of the Bohr Model of the Hydrogen Atom

Optimiller: An Interactive Environment that Helps Students in the Understanding, Design and Optimization of Miller Electronic Oscillator Circuits for QCM Sensors

Increasing digital investigator availability through efficient workflow management and automation

Optimiller: An Interactive Environment that Helps Students in the Understanding, Design and Optimization of Miller Electronic Oscillator Circuits for QCM Sensors

Induced transparency in double-ring photonic switches for optical Networks-on-Chip

Temperature compensation of QCM sensors in liquid media

Electrolyte Uptake Kinetics in Doped and Undoped sol-gel Films Using a High Resolution EQCM Oscillator Sensor

Simultaneously measurement of frequency shift and series resistance changes of a quartz resonator using a miller QCM oscillator

O6.3 Cross-cultural adaptation and validity of the Body Image Quality of Life Inventory (BIQLI) to be used with Brazilian burned patients

Passive QCM sensor system for monitoring of water absorption and drying in Nafion® polymer membranes

Dynamic events in optical networks - emulation and performance impact analysis

Ingress of water into organic coatings: Real-time monitoring of the capacitance and increase in mass

Analysis of two FPGA design methodologies applied to an image processing system

Water uptake kinetics in anti-corrosion organic films with a high resolution microbalance oscillator sensor

Application of the QCM in lead acid batteries electrolyte measurements

FPGA-based direct resistance and capacitance measurements

Design and implementation of a DNA biosensor based on a 50MHz QCM electronic oscillator circuit

A FPGA-based frequency measurement system for high-accuracy QCM sensors

FPGA-based design, implementation, and evaluation of digital sinusoidal generators

Monitoring of water uptake in anti-corrosion organic coatings using a quartz crystal oscillator sensor

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