A5077197260- Advanced Radiotherapy Techniques
- Radiation Therapy and Dosimetry
- earthquake and tectonic studies
- Medical Imaging Techniques and Applications
- Geological and Tectonic Studies in Latin America
- Advanced X-ray and CT Imaging
- Radiation Effects and Dosimetry
- Earthquake Detection and Analysis
- Geological and Geophysical Studies Worldwide
- Radiation Dose and Imaging
- Effects of Radiation Exposure
- Software Reliability and Analysis Research
- Geological and Geochemical Analysis
- Radiation Effects in Electronics
- Seismology and Earthquake Studies
- Electrostatic Discharge in Electronics
- Nursing care and research
- VLSI and Analog Circuit Testing
- Radiation Detection and Scintillator Technologies
- Geotourism and Geoheritage Conservation
- Adventure Sports and Sensation Seeking
- Science, Research, and Medicine
- GNSS positioning and interference
- Geography Education and Pedagogy
- Groundwater and Isotope Geochemistry
National Autonomous University of Honduras
2010-2023
Laboratoire de Physique de l'ENS
2023
Carleton University
2012-2013
The Ohio State University
2011
Stanford University
2008-2010
University of Wisconsin–Madison
2005-2009
Louisiana State University Agricultural Center
2003
Centre National de la Recherche Scientifique
1999
Laboratoire d'Analyse et d'Architecture des Systèmes
1999
Roche (France)
1999
Central America is located in a dynamic region where tectonics and volcanism together with the tropical climate its diverse vegetation have shaped landscapes. Our main objective to review status of geodiversity, geoconservation, geotourism America. We will identify region’s geomorphic environments geodiversity using classic regional geomorphology mapping techniques. Likewise, touristic maps webpages, we most prominent geosites different origin Moreover, explore national environmental...
We invert GPS velocities from 32 sites in El Salvador, Honduras and Nicaragua to estimate the rate of long-term forearc motion distributions interseismic coupling across Middle America subduction zone offshore these countries faults Salvadoran Nicaraguan volcanic arcs. A 3-D finite element model is used approximate geometries interface strike-slip arc determine elastic response faults. The are best fit by a which moves 14–16 mm yr−1 has 85–100 per cent arc, agreement with high level historic...
We combine geodetic, structural, and paleomagnetic data from El Salvador with Global Positioning System (GPS) southern Honduras Nicaragua to describe the motions of Salvadoran Nicaraguan forearcs determine location style faulting across Gulf Fonseca offset volcanic arcs eastern western Nicaragua. Finite-element modeling GPS measurements at 35 sites in Salvador, Honduras, indicates that both move west northwest, parallel their respective trenches, 15 ± 2 mm yr−1 (95% limit) a Caribbean plate...
The purpose of this work was to commission a 120 kVp photon beam produced by micro-computed tomography (microCT) scanner for use in irradiating mice therapeutic doses. A variable-aperture collimator has been integrated with microCT allow the delivery beams pseudocircular profiles arbitrary width between 0.1 and 6.0 cm. dose rate at isocenter system measured using ion chamber gafchromic EBT film as 1.56–2.13 Gy min−1 water surface field diameters 0.2 decreases approximately 10% per every 5 mm...
We use GPS measurements at 37 stations in Honduras and El Salvador to describe active deformation of the western end Caribbean Plate between Motagua fault Central American volcanic arc. All sites located eastern move with Plate, accord geologic evidence for an absence neotectonic this region. Relative other study area west west-northwest rates that increase gradually from 3.3 ± 0.6 mm yr−1 central 4.1 as high 11–12 southern Guatemala. The site motions are consistent slow westward extension...
We describe a new elastic-kinematic model for the present tectonics of northern Central America and southern Mexico, where Motagua-Polochic fault zone, Middle subduction zone faults in volcanic arc pose significant seismic hazards. The model, which consists angular velocities eight plates blocks, interseismic locking solutions some block-bounding strain-rate tensors three blocks with internal deformation, optimizes fit to regional azimuths earthquake slip directions 200+ station GPS velocity...
Subduction zones exhibit variable degrees of interseismic coupling as resolved by inversions geodetic data and analyses seismic energy release. The degree to which a plate boundary fault is coupled can have profound effects on its seismogenic behaviour. Here we use GPS measurements estimate co- post-seismic deformation from the 2012 August 27, Mw7.3 megathrust earthquake offshore El Salvador, was tsunami earthquake. Inversions estimated coseismic displacements are in agreement with published...
We use continuous and campaign measurements from 215 GPS sites in northern Central America southern Mexico to estimate coseismic afterslip solutions for the 2009 Mw = 7.3 Swan Islands fault strike-slip earthquake 2012 El Salvador 7.4 Guatemala thrust-faulting earthquakes on Middle trench. Our simultaneous, time-dependent inversion of more than 350 000 daily site positions gives first jointly consistent estimates slips all three earthquakes, their combined post-seismic effects secular station...
We use measurements at 35 GPS stations in northern Central America and 25 seismometers teleseismic distances to estimate the distribution of slip, source time function Coulomb stress changes Mw = 7.3 2009 May 28, Swan Islands fault earthquake. This event, largest region for several decades, ruptured offshore continuation seismically hazardous Motagua Guatemala, site destructive Ms 7.5 earthquake 1976. Measured offsets range from 308 millimetres a campaign Honduras 6 five continuous sites El...
SUMMARY The North Anatolian Fault is the ∼1200-km-long active continental transform boundary between Anatolia and Eurasia. This strike-slip system initiated around 10–12 Ma experienced diachronous episodes of strain localization along its strike. structural evolution ∼350-km-long fault segments crossing Aegean Sea remains to be accurately investigated. There, modern localized two main branches: northern branch ends at Trough southern Edremit-Skyros Trough. Evia Basin located in Domain...
MAFALDA (Microkernel Assessment by Fault injection Analysis and Design Aid) is a generic tool providing quantitative information on COTS microkernels to support their integration into dependable systems. The main originality of relies the features provided for both analysis failure modes target microkernel design error confinement wrappers. paper illustrates: (i) how organized its user interface, (ii) it can be used carry out fault campaigns. Finally, we present experimental context...
The influence of the software, and its interaction interdependency with hardware in creation propagation failures, are usually neglected reliability analyses safety critical systems. software operation is responsible for usage semiconductor devices along system lifetime. This consists voltage changes current flows that steadily degrade materials circuit until degradation becomes permanent, device can no longer perform intended function. At level, these failures manifest as stuck-at values,...
A design of a radiation facility for very small specimens used in radiobiology is presented. This micro-irradiator has been primarily designed to irradiate partial bodies zebrafish embryos 3–4 mm length. miniature x-ray, 50 kV photon beam, as source. The source inserted cylindrical brass collimator that pinhole 1.0 diameter along the central axis produce pencil beam. with attached underneath computer-controlled movable table which holds specimens. Using 45° tilted mirror, digital camera,...
Dosimetry characteristics of the ADII‐33 diamond detector were investigated. Sensitivity, stability, bias voltage, hardening, dose rate, energy dependence, and spatial resolution examined. Current generated in was found to be proportional voltage applied with stability degrading as a function voltage. The average current increased increasing statistical fluctuation less than 0.3% regardless optimal at which uncertainty is negligible, . hardened up without significant degradation output...
Small animals are highly valuable resources for radiobiology research. While rodents have been widely used decades, zebrafish embryos recently become a very popular research model. However, unlike rodents, lack appropriate irradiation tools and methodologies. Therefore, the main purpose of this work is to use Monte Carlo radiation transport simulations characterize dosimetric parameters, determine sensitivity help with design new micro-irradiator capable delivering fields as small 1.0 mm in...
Purpose: The zebrafish, Danio rerio has in recent years become a preferred model to study human disease. Our aim was test the new micro‐irradiator for its capability perform basic radiobiology experiments, particular investigate relationship between radiation, apoptosis and inflammatory response. Materials Methods: A novel micro‐irradiator, which enables high dose radiation of biological samples below 1 mm, used irradiate zebrafish embryos at different age postfertilization. Two experiments...
Purpose: To retrospectively account for the intrinsic energy dependence of TLDs when used to measure dose rate constants (DRC) I–125 and Pd‐103 brachytherapy seeds, establish new measured values all seeds compare with Monte Carlo (MC) consensus published by TG‐43U1. Methods: calculate relative absorbed‐dose dependence, f ^ rel, ratio D(TLD)/D(w) at energies Co‐60 is calculated using EGSnrc BrachyDose code TLD sized voxels 1 cm from seed centered in a water phantom. A similar geometry high...
Purpose: To compare measured energy spectra of 125 I brachytherapy seeds with Monte Carlo calculated when using the bare spectrum recommended by TG43 and one presented in NCRP Report 58 to determine impact these different on calculation dose rate constant. Methods: The spectrum, absorbed at 1 cm bisector air kerma strength 10 were EGSnrc BrachyDose code. Energy bin width was 0.2 keV. simulations done or 58. Statistical uncertainties for 0.02% 0.1% less other clinical parameters. Results are...