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472 results on '"Rodriguez, Guido"'

1. Integrating high-resolution remote sensing and empirical wildlife detection data for climate-resilient corridors across tropical elevational gradients

Author

McCullough, Ian M., Beirne, Christopher, Soto-Navarro, Carolina, Eppert, Amy, Flatt, Eleanor, Kemp, Yvonne J.M., Molnár, Péter K., Mooring, Michael S., Nikolova, Yana, Olson, Erik R., Pinto, Carolina, Porras, Junior, Quirós, María José Mata, Rodriguez, Guido Saborío, Schipper, Jan, Tellez, Chelsey R., Vargas Soto, Juan S., and Whitworth, Andrew

Published
2024
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2. Objective Evaluation of Spatial Information Acquisition Using a Visuo-tactile Sensory Substitution Device

Author

Brayda, Luca, Campus, Claudio, Chellali, Ryad, Rodriguez, Guido, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Ge, Shuzhi Sam, editor, Li, Haizhou, editor, Cabibihan, John-John, editor, and Tan, Yeow Kee, editor

Published
2010
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3. Cortical sources of resting state electroencephalographic alpha rhythms deteriorate across time in subjects with amnesic mild cognitive impairment

Author

Babiloni, Claudio, Del Percio, Claudio, Lizio, Roberta, Marzano, Nicola, Infarinato, Francesco, Soricelli, Andrea, Salvatore, Elena, Ferri, Raffaele, Bonforte, Cinzia, Tedeschi, Gioacchino, Montella, Patrizia, Baglieri, Annalisa, Rodriguez, Guido, Famà, Francesco, Nobili, Flavio, Vernieri, Fabrizio, Ursini, Francesca, Mundi, Ciro, Frisoni, Giovanni B., and Rossini, Paolo M.

Published
2014
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10. Traditional and non traditional risk factors in accelerated atherosclerosis in Systemic Lupus Erythematosus: Role of vascular endothelial growth factor (VEGATS Study)

Author

Colombo, Barbara Maria, Cacciapaglia, Fabio, Puntoni, Matteo, Murdaca, Giuseppe, Rossi, Edoardo, Rodriguez, Guido, Nobili, Flavio, Pisciotta, Livia, Bertolini, Stefano, Moccetti, Tiziano, Dentali, Francesco, Steidl, Luigi, Ciprandi, Giorgio, Afeltra, Antonella, Indiveri, Francesco, and Puppo, Francesco

Published
2009
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12. Directionality of EEG synchronization in Alzheimer's disease subjects

Author

Babiloni, Claudio, Ferri, Raffaele, Binetti, Giuliano, Vecchio, Fabrizio, Frisoni, Giovanni B., Lanuzza, Bartolo, Miniussi, Carlo, Nobili, Flavio, Rodriguez, Guido, Rundo, Francesco, Cassarino, Andrea, Infarinato, Francesco, Cassetta, Emanuele, Salinari, Serenella, Eusebi, Fabrizio, and Rossini, Paolo M.

Published
2009
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19. Cortical sources of awake scalp EEG in eating disorders

Author

Rodriguez, Guido, Babiloni, Claudio, Brugnolo, Andrea, Del Percio, Claudio, Cerro, Fabrizio, Gabrielli, Filippo, Girtler, Nicola, Nobili, Flavio, Murialdo, Giovanni, Rossini, Paolo M., Rossi, Davide Sebastiano, Baruzzi, Chiara, and Ferro, Antonio Maria

Published
2007
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20. Fusion of the MR image to SPECT with possible correction for partial volume effects

Author

Calvini, Piero, Massone, Anna Maria, Nobili, Flavio Mariano, and Rodriguez, Guido

Subjects
Magnetic resonance imaging -- Usage, SPECT imaging -- Usage, Image processing -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

Low spatial resolution and the related partial volume effects limit the diagnostic potential of brain single photon emission computed tomography (SPECT) imaging. As a possible remedy for this problem we propose a technique for the fusion of SPECT and MR images, which requires for a given patient the SPECT data and the T1-weighted MR image. Basically, after the reconstruction and coregistration steps, the high-frequency part of the MR, which would be unrecoverable by the set SPECT acquisition system + reconstruction algorithm, is extracted and added to the SPECT image. The tuning of the weight of the MR on the resulting fused image can be performed very quickly, any iterative reconstruction algorithm can be used and, in the case that the SPECT projections are not available, the proposed technique can also be applied directly to the SPECT image, provided that the performance of the scanner is known. The procedure has the potential of increasing the diagnostic value of a SPECT image. Even in the locations of SPECT-MR mismatch it does not significantly affect quantitation over regions of interest (ROIs) whose dimensions are decidedly larger than the SPECT resolution distance. On the other hand, appreciable corrections for partial volume effects are expected in the locations where the contrast in the structural MR matches the corresponding contrast in functional activity. Index Terms--Functional imaging, image fusion, iterative reconstruction techniques, multimodality imaging, partial volume effect (PVE) correction, single photon emission computed tomography (SPECT) quantitation.

Published
2006

40. Mapping distributed sources of cortical rhythms in mild Alzheimer's disease. A multicentric EEG study

Author

Babiloni, Claudio, Binetti, Giuliano, Cassetta, Emanuele, Cerboneschi, Daniele, Dal Forno, Gloria, Del Percio, Claudio, Ferreri, Florinda, Ferri, Raffaele, Lanuzza, Bartolo, Miniussi, Carlo, Moretti, Davide V, Nobili, Flavio, Pascual-Marqui, Roberto D, Rodriguez, Guido, Romani, Gian Luca, Salinari, Serenella, Tecchio, Franca, Vitali, Paolo, Zanetti, Orazio, Zappasodi, Filippo, and Rossini, Paolo M

Published
2004
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45. Almacenamiento de carbono en dos parcelas permanentes de muestreo del Refugio de Vida Silvestre Rio Escalante Chacocente, 2016

Author

Rodriguez Guido, Luby Esther

Subjects
K10 Producción forestal
Abstract

La cuantificación de biomasa y carbono almacenado es importante para fortalecer laconservacióndel bosque tropical seco de Nicaragua, dado que éste tiene una gran presión social y una alta dependencia de la población sobre el mismopor lo que se considera vulnerable ante los efectos del cambio climático.Para ampliar las investigaciones sobre el bosque tropical seco de Nicaragua se planteóeste trabajo de investigación con la finalidad de estimar la cantidad de carbono almacenado en dos parcelas permanentes de muestreo del Refugio de Vida Silvestre Río Escalante Chacocente, ubicado en el Municipiode SantaTeresa,Departamento de Carazo.El Tamarindo y Los Melones fueron las parcelas consideradas en este estudio. Ambas parcelas tienen un área de 1 ha y en ellas se realizó un inventario al 100% de los árboles que presentaban un diámetro mayor a 10 cm. Las variables evaluadas fueron: diámetro a la altura del pecho (1.30m), área basal, biomasa aérea total y carbono almacenado.En la parcela El Tamarindo se identificaron 52 especies arbóreas representadas en 27 familias botánicas. También en esta parcela se estimó un contenido de biomasa aérea de 49.98t/hay un contenido de carbono almacenado de 24.99 t C/ha.En la parcela Los Melones se identificaron 39especies arbóreas representadas en 22 familias botánicas. Para esta parcela Los Melones, se estimó un contenido de biomasa aérea de 47.91 t/hay un contenido de carbono almacenado de 23.96 t C/ha.Estos resultados pueden ser utilizados para acceder al beneficio de venta de bonos de Carbono dentro del incentivo pago por servicios ambientales.

Published
2019

46. Characterization of natural fractures of the Upper Devonian Duvernay Formation in the Kaybob Area, Alberta

Author

Garcia Rodriguez, Guido

Subjects
Natural Fractures, Duvernay, Unconventional Reservoirs, Kaybob
Abstract

Abstract: The organic-rich mudstones of the Upper Devonian Duvernay Formation constitute an unconventional reservoir in the Western Canada Sedimentary Basin, developed for over a decade using hydraulic fracturing technology. Integrating natural fracture characterization with lithofacies analysis, mechanical properties examination, and regional structural study can define the mechanical stratigraphy of mudrocks, reconstruct stress fields, and elucidate basin-scale fluid flow during fracturing. Determining the geometry, orientation, and fracture intensity of natural fractures is crucial for fracture modeling, horizontal well placement, and optimizing hydraulic fracturing and production operations. This study focuses on characterizing natural fractures in the Duvernay Formation in the Kaybob area. It seeks to determine fracture intensity, controlling factors of fracture propagation, and the relative timing of fracturing in the Upper Devonian organic-rich mudrocks beneath the Alberta Basin. Objectives include analyzing lithofacies, mechanical properties, type, geometry (height, length, aperture), orientation, intensity/spacing of natural fractures, and fracture structural settings. Results on fracture morphology and distribution in the Duvernay Formation are compared to descriptions and structural analyses of fractures in the Upper Devonian Perdrix Formation in the Front Ranges and Foothills of the Nordegg area, serving as an outcrop analog of the Duvernay Formation. The aim is to correlate phases and timing of fracturing in these areas. The research is based on the description and analysis of approximately 418 meters of core, core tests, and well logs in seven vertical wells, as well as around 4.4 kilometers of Formation Micro-Imager (FMI) logs in four horizontal wells in the Kaybob area. 3D structural modeling (90 km x 90 km) and facies modeling (2 km x 2 km to 10 km x 12 km) were conducted to interpret the lateral distribution of lithofacies and fractures in the Duvernay, Majeau Lake, and Leduc Formations. Seven lithofacies are identified in the Duvernay Formation core, with three constituting nearly 95% of the total thickness. Facies F2 exhibits ductile behavior with low calcite content, high illite, and total organic carbon (TOC), and low elastic and strength parameters (UCS, YM, TSTR). Facies F3 displays moderate stiffness and strength with intermediate calcite, illite, TOC, and elastic and strength parameters. Facies F5 shows stiff behavior with high calcite content, low illite, TOC, and high elastic and strength parameters. The lower fracture intensity in facies F2 and F5 can be related to more ductile mechanical properties of facies F2, which are not favorable for fracture propagation, and higher thickness of beds in facies F5. Analysis of drilling-induced fractures and breakouts in FMI logs helped determine the orientation of the present-day maximum horizontal stress (SHmax) as N53° ± 2°, with SHmax>Sv. Tensile calcite-filled vertical fractures (#2003) in the Duvernay Formation form three main sets oriented parallel, orthogonal, and at approximately 20° to SHmax. Open and subhorizontal fractures and polished slip faces are subordinate. Fracture intensity in mudrocks varies from approximately 1 to 1.6 fract/m in vertical wells and from around 3 to 4.5 fract/m and m²/m³ in horizontal wells. The highest fracture intensity occurs in thinly bedded organic- and carbonate-rich mudrocks of facies F3 compared to more ductile organic-rich biosiliceous mudrocks of facies F2 and stronger and stiffer carbonate-rich nodular mudrocks of facies F5. Hydrocarbon generation and fluid expansion are significant mechanisms for fracture development in shales. In the study area, thermal maturity organic-rich mudrocks, fluid pressure, and burial depth of the Duvernay Formation increase from the northeast to the southwest. Estimated fracture intensity from vertical wells similarly increases from the northeast to the southwest. Proposed phases of fracturing in the Duvernay Formation during burial and uplift are based on fracture characterization and regional data on fracturing in Upper Devonian carbonate rocks of the West Shale Basin. Fracture intensity in organic-rich mudrocks of the Perdrix Formation is higher than in the mudrocks of the Duvernay due to increased deformation in the Front Ranges. Two deformation phases are identified, involving subhorizontal calcite-filled tensile fractures and bedding-orthogonal tensile and transtensional fractures during the Laramide orogeny, and NNW-SSE open subvertical fractures likely during Eocene extension. The detailed investigation of natural fractures in the Duvernay and Perdrix Formations in core, image logs, and outcrops provides geoscientists and engineers with crucial information for fracture modeling. This information can enhance exploration, drilling, and production practices of the source rock reservoir in the Western Canada Sedimentary Basin.

Published
2024

49. Metabolic and cardiovascular risk in patients with a history of differentiated thyroid carcinoma: A case-controlled cohort study

Author

Giusti Massimo, Mortara Lorenzo, Degrandi Roberta, Cecoli Francesca, Mussap Michele, Rodriguez Guido, Ferone Diego, and Minuto Francesco

Subjects
Diseases of the endocrine glands. Clinical endocrinology, RC648-665
Abstract

Abstract Hyperthyroidism seems to increase metabolic and cardiovascular risk, while the effects of sub-clinical hyperthyroidism are controversial. We evaluated metabolic and cardiovascular parameters in differentiated thyroid carcinoma (DTC) patients with suppressed thyrotropin (TSH) due to levo-thyroxine (L-T4) therapy. We studied DTC patients and, as a control group, patients with a history of surgery for non-malignant thyroid pathology. Significantly higher insulin and lower HDL-cholesterol levels were recorded in DTC subjects. In both groups, insulin levels were significantly related with body mass index (BMI) but not with age or L-T4 dosage. In DTC patients, a significant negative correlation was seen between HDL-cholesterol and BMI or L-T4 dosage. In both groups, intima-media thickness (IMT) correlated positively with age, BMI, glucose levels and systolic blood pressure. In DTC patients, increased IMT was significantly correlated with glycated hemoglobin (HbA1c), cholesterol and triglycerides. In DTC patients, C-reactive protein correlated positively with insulin, insulin resistance, triglycerides and systolic blood pressure, and negatively with HDL-cholesterol. In both DTC and control subjects, fibrinogen correlated positively with age, BMI, increased IMT, HbA1c and systolic blood pressure. In DTC subjects, plasma fibrinogen concentrations correlated positively with insulin resistance, cholesterol and LDL-cholesterol, and negatively with TSH levels. Our data confirm that the favorable evolution of DTC can be impaired by a high incidence of abnormal metabolic and cardiovascular data that are, at least in part, related to L-T4 therapy. These findings underline the need for adequate L-T4 titration.

Published
2008
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50. Correction

Author

Rodriguez, Guido, Nobili, Flavio, Tanganelli, Paolo, Regesta, Gianni, and Ottonello, Gianandrea

Published
1996

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