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Papers by lucas medina martinez

PLOS ONE

Background Several tools exist to measure tightness of the gastrocnemius muscles; however, few of... more Background Several tools exist to measure tightness of the gastrocnemius muscles; however, few of them are reliable enough to be used routinely in the clinic. The primary objective of this study was to evaluate the intra- and inter-rater reliability of a new equinometer. The secondary objective was to determine the load to apply on the plantar surface of the metatarsal heads to achieve the highest reliability when measuring gastrocnemius tightness. Methods The equinometer consisted of a goniometer and an electronic dynamometer, hooked up to a computer. Three raters carried out three trials of passive dorsiflexion by applying controlled pressure to the metatarsal heads of both ankles in 29 healthy subjects under two experimental conditions: knee extended (KE) and knee flexed at 30 degrees (KF). The equinometer continuously recorded the ankle dorsiflexion values (in °) corresponding to each 1 N interval of plantar pressure between 4 N and 20 N. The intra- and inter-rater reliability o...

Community Development, 2022

The perspective of social capital has gained prominence in the last 25 years in research and inte... more The perspective of social capital has gained prominence in the last 25 years in research and intervention in the social and educational fields.There is an open debate on the application of this concept in community action processes. The objective of this article is to identify and analyze the basic factors that influence the generation of social capital within the Community Development Plan of Poble Sec de Barcelona.A qualitative research process was designed in two phases: one to review the existing academic literature on the factors that generate community social capital, and a second focused on the case analysis of a Community Development Plan. Results such as the wealth of community associations, the feeling of belonging and the ability to mobilize neighbors to get involved in collective actions of a social nature, show that Community Development Plans can provide an adequate context for the gen-eration of social capital.

PLOS ONE, 2021

Background Lateralization of the glenoid implant improves functional outcomes in Reverse Shoulder... more Background Lateralization of the glenoid implant improves functional outcomes in Reverse Shoulder Arthroplasty. Lateralization does not appear to impact the Deltoid’s Moment Arm. Therefore, the stabilizing effect described in the literature would not be the result of an increase this moment arm. A static biomechanical model, derived from Magnetic Resonance Imaging, can be used to assess the coaptation effect of the Middle Deltoid. The objective of this study was to analyze the impact of increasing amounts of glenoid lateralization on the moment arm but also on its coaptation effect. Methods Eight patients (72.6 ± 6.5 years) operated for Reverse Shoulder Arthroplasty were included in the study. Three-dimensional models of each shoulder were created based on imaging taken at 6 months postoperative. A least square sphere representing the prosthetic implant was added to each 3D models. A static biomechanical model was then applied to different planar portions of the Middle Deltoid (from...

This report is published in the interest of scientific and technical information exchange, and it... more This report is published in the interest of scientific and technical information exchange, and its publication does not constitute the Government's approval or disapproval of its ideas or findings.

Saber, 1992

El presente trabajo es una breve recopilacion bibliografica sobre los mas notorios desarrollos re... more El presente trabajo es una breve recopilacion bibliografica sobre los mas notorios desarrollos recientes en diversas areas de la ingenieria del procesamiento de los alimentos, como una de las derivaciones de la ingenieria quimica, de mayor auge actualmente. Se presentan aspectos novedosos en Extraccion Supercritica, Extraccion, Procesamiento y Empacado Asepticos, Tecnicas Biotecnologicas y Control por Computadores en la Industria del Procesamiento de Alimentos

Revista Argentina De Antropologia Biologica, 2003

El Institut Cartogràfic de Catalunya (ICC) opera la cámara digital aerotransportada Z/I Digital M... more El Institut Cartogràfic de Catalunya (ICC) opera la cámara digital aerotransportada Z/I Digital Mapping Camera (DMC) para diversos trabajos cartográficos. Como todo sistema fotográfico de este mismo tipo la imagen padece una degradación en su resolución debida al sistema formador y al efecto de la atmósfera, por lo que la medida objetiva de la resolución con la cámara va más allá de la dimensión geométrica del píxel y el Ground Sampling Distance (GSD). En este trabajo se analiza la fracción de pérdida de resolución que causa la atmósfera en función de las condiciones atmosféricas. Para estimar la resolución se emplea una reconstrucción de la Función de Dispersión del Borde (Edge Spread Function, ESF) para obtener la Función de Dispersión de la Línea (Line Spread Function, LSF), cuyo Full Width at Half Maximum (FWHM) proporciona un valor de resolución en magnitud píxel. Para simular la atmosfera se ha aplicado el código de transferencia radiativa Second Simulation of the Satellite Si...

Remote Sensing, 2009

The transition from film imaging to digital imaging in photogrammetric data capture is opening in... more The transition from film imaging to digital imaging in photogrammetric data capture is opening interesting possibilities for photogrammetric processes. A great advantage of digital sensors is their radiometric potential. This article presents a state-of-the-art review on the radiometric aspects of digital photogrammetric images. The analysis is based on a literature research and a questionnaire submitted to various interest groups related to the photogrammetric process. An important contribution to this paper is a characterization of the photogrammetric image acquisition and image product generation systems. The questionnaire revealed many weaknesses in current processes, but the future prospects of radiometrically quantitative photogrammetry are promising.

Neurosurgery, 1981

A specific gravity, column gradient method was coupled with a tissue punch technique to measure r... more A specific gravity, column gradient method was coupled with a tissue punch technique to measure regional edema in the traumatized spinal cord of the cat at 1 and 2 hours after a 500-g/cm impact injury. A significant increase in water content was observed at the injury site in the posterior, anterior, and lateral white columns by 1 hour after injury and extended 2 mm above and below the site by 2 hours after injury.

Neurosurgery, 1979

Symptomatic Rathke's cleft cysts are uncommon. We present a case with suprasellar extension m... more Symptomatic Rathke's cleft cysts are uncommon. We present a case with suprasellar extension manifested by hypopituitarism and visual disturbances. The treatment was trans-sphenoidal evacuation and partial removal of the capsule. We suggest that the trans-sphenoidal approach to these lesions is usually adequate and that radical removal of the capsule is not necessary.

International Journal of Remote Sensing, 2008

Brain Research, 1980

The steady state composition of the free amino acid (AA) pool of the central nervous system (CNS)... more The steady state composition of the free amino acid (AA) pool of the central nervous system (CNS) remains relatively constant under physiologic conditions. However, in certain pathophysiologic states such as hypoglycemia and hypoxia, the steady state is well known to be significantly altered in the mammalian brain. The changes reported involve primarily those AAs which interact extensively with the intermediates of the tricarboxylic acid cycle (TCA) such as glutamate and aspartate. While there is abundant information concerning the composition of the brain free AA pool and its changes during pathologic conditions leading to hypoglycemia and hypoxia, there is little information on free AA in analogous conditions in the spinal cord, and practically none following traumatic spinal cord injury (SCI). Spinal cord injury causes a progressive microcirculatory failure (oligaemia) within the region of trauma, and this failure has been postulated as a primary mechanism of the devastating and irreversible functional loss of the severely injured spinal cord 5,7,s,zl. It was the purpose of this study to determine the extent to which SCI and its associated oligaemia influences the free AA composition of the spinal cord. One hour following SCI, 14 identified AAs, including putative AA neurotransmitters, were determined in the gray and white matter of the thoracic (T8) cord of the cat and compared to sham-operated controls. The gray and white matter were determined separately because the two regions exhibit different pathologic response rates to trauma. The gray is destroyed usually within 3-6 h, while the white matter remains histologically intact for considerably longer periods (6-12 h) following SCI is. Eight cats (3 4-0.5 kg) of mixed breed and unselected with respect of age or sex were used for these experiments. Anesthesia was induced with ketamine HC1 (50 mg/kg) and the animals were allowed to breathe spontaneously. A cannula was inserted into the femoral artery to monitor the blood pressure and arterial blood gases. The animals were mounted in a stereotaxic frame, and the T7 and T8 spinous

Abstract : This preliminary report focuses on the research and development (R&D) and demonstr... more Abstract : This preliminary report focuses on the research and development (R&D) and demonstration of an unmanned ground system (UGS) technology suitable for tele-operated and autonomous robotic firefighting. The R&D effort was conducted by the Air Force Research Laboratory's (AFRL), Materials and Manufacturing Directorate (RXQ), Airbase Engineering Development Branch (RXQE). RXQE performed the demonstration at Ft. Drum, NY, a U.S. Army military reservation in support of AFRL's 2010 Tech Warrior Exercise. The demonstration involved the use of AFRL's developed unmanned firefighting vehicle (UFV), known as the Fire Defender, to showcase first generation autonomous UFV behaviors to assist emergency first responders/firefighters in hazardous fire environments.