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Search Results: 1 - 10 of 14392 matches for " Jaime Alfredo Mateus-Pineda "
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Dise?o de controladores de tipo proporcional integral derivativo (PID) y difuso para la posición de un motor de corriente continua (DC)
Rairán-Antolines,José Danilo; Guerrero-Cifuentes,Cindy Estéfany; Mateus-Pineda,Jaime Alfredo;
Ingeniería y Universidad , 2010,
Abstract: the performance of pid and fuzzy controllers is compared in a commercial device normally used in model airplanes: the s3004 futaba servo. the controller circuit, the power amplifier and the sensor are modified, and then the motor is observed. next, a root-locus method is used to tune a pid for angular position control. simulations and control are made in matlab's simulink, and also a data acquisition card (pci 6024e) is used. results are analyzed at the end of the document: although the pid controller works better, the fuzzy controller shows a similar performance.
Dise o de controladores de tipo proporcional integral derivativo (PID) y difuso para la posición de un motor de corriente continua (DC)
José Danilo Rairán-Antolines,Cindy Estéfany Guerrero-Cifuentes,Jaime Alfredo Mateus-Pineda
Ingeniería y Universidad , 2010,
Abstract: The performance of PID and fuzzycontrollers is compared in a commercialdevice normally used in modelairplanes: the S3004 Futaba Servo.The controller circuit, the poweramplifier and the sensor are modified,and then the motor is observed. Next,a root-locus method is used to tunea PID for angular position control.Simulations and control are made inMatlab’s Simulink, and also a dataacquisition card (PCI 6024E) is used.Results are analyzed at the end of thedocument: although the PID controllerworks better, the fuzzy controllershows a similar performance.
Sensorimotor cortex as a critical component of an 'extended' mirror neuron system: Does it solve the development, correspondence, and control problems in mirroring?
Jaime A Pineda
Behavioral and Brain Functions , 2008, DOI: 10.1186/1744-9081-4-47
Abstract: Human beings are social creatures to the extent that interactions with members of their own species, and especially the ability to understand and infer the intentions and beliefs of others, has become of predominant importance in their daily life. Whether for cooperation or non-cooperation, a core assumption of this viewpoint is that such social interactions spring from a distinction between self and others. It can be argued that at least two hierarchically-organized, overlapping and interacting neural systems have evolved and developed to manage self-other distinctions and hence social interactions [1]. One system, part of the classic motor system, is more specialized for the preparation and execution of motor actions that are self realized and voluntary, while the other appears to be more involved in capturing and understanding, at a basic and involuntary level, the actions of non-self or others. For our purposes, actions are defined as sequences of movements that together solve a motor problem [2] and that involve at least four levels of behavioral complexity: intention, kinematics, goal-object identity, and the physical consequences of the action [1]. Motor preparation and execution circuitry includes, among others, the premotor cortex, supplementary motor area, sensorimotor cortices, and parts of the inferior parietal cortex. The second system, of which the mirror neuron system (MNS) is part, has been described as the canonical action 'resonance' system in the brain – one that has evolved to utilize or share many of the same circuits involved in motor control [3]. Mirroring or 'shared circuit' systems are assumed to be important for resonating, imitating, and/or simulating the actions of others. Although no consensus exists, a number of researchers have proposed that shared representations of motor actions, or the action understanding properties of this system, may form a foundational cornerstone for higher order social processes, including motor learning, acti
Neuroanthropology: Olfactory Recognition of the Self / Non-self by the Ancestral MHC: An EEG Study
Emma Marxer-Tobler,Jaime Pineda
International Journal of Biology , 2012, DOI: 10.5539/ijb.v4n4p1
Abstract: Humans naturally discriminate between different ethnic group members using visual and other sensory information, including the sense of smell. The genetic diversity of humans serves as biological and social sign stimuli in the neural self/non-self recognition process. As already evident, the major histocompatibility complex (MHC) encodes both an individual self and a shared ancestral self into the body odor. In a pilot study, we examine the brain-evoked responses to ancestral encoded body odors by conducting an olfactory EEG recording of four different groups: Germans, Taiwanese, Koreans, and Chinese. Results show that humans recognize in-group members as familiar and they exhibit practically identical rhythmic EEG patterns to one’s own odor as it pertains to the ancestral in-group odors. This reveals their genetic relatedness. It is hereby demonstrated that shared ethnicity results in behaviors (both group-protective and pro-social) that are important to intra- and inter-group dynamics.
Spokes cluster: The search for the quiescent gas
Jaime E Pineda,Paula S. Teixeira
Physics , 2013, DOI: 10.1051/0004-6361/201220861
Abstract: Context. Understanding the role of fragmentation is one of the most important current questions of star formation. To better understand the process of star and cluster formation, we need to study in detail the physical structure and properties of the parental molecular cloud. The Spokes cluster, or NGC 2264 D, is a rich protostellar cluster where previous N2H+(1-0) observations of its dense cores presented linewidths consistent with supersonic turbulence. However, the fragmentation of the most massive of these cores appears to have a scale length consistent with that of the thermal Jeans length, suggesting that turbulence was not dominant. Aims. These two results probe different density regimes. Our aim is to determine if there is subsonic or less-turbulent gas (than previously reported) in the Spokes cluster at higher densities. Methods. We present APEX N2H+(3-2) and N2D+(3-2) observations of the NGC2264-D region to measure the linewidths and the deuteration fraction of the higher density gas. The critical densities of the selected transitions are more than an order of magnitude higher than that of N2H+(1-0). Results. We find that the N2H+(3-2) and N2D+(3-2) emission present significantly narrower linewidths than the emission from N2H+(1-0) for most cores. In two of the spectra, the nonthermal component is close (within 1-sigma) to the sound speed. In addition, we find that the three spatially segregated cores, for which no protostar had been confirmed show the highest levels of deuteration. Conclusions. These results show that the higher density gas, probed with N2H+ and N2D+(3-2), reveals more quiescent gas in the Spokes cluster than previously reported. More high-angular resolution interferometric observations using high-density tracers are needed to truly assess the kinematics and substructure within NGC2264-D. (Abridged)
Minimal HCN emission from Molecular Clouds in M33
Erik Rosolowsky,Jaime Pineda,Yu Gao
Physics , 2011, DOI: 10.1111/j.1365-2966.2011.18851.x
Abstract: Since HCN emission has been shown to be a linear tracer of ongoing star formation activity, we have searched for HCN (J = 1->0) emission from known GMCs in the nearby galaxy M33. No significant HCN emission has been found along any of the lines of sight. We find two lines of sight where CO-to-HCN integrated intensity ratios up to 280, nearly a factor of 6 above what is found in comparable regions of the Milky Way. Star formation tracers suggest that the HCN-to-star formation rate ratio (L_HCN/M_SFR) is a factor of six lower than what is observed in the Milky Way (on average) and local extragalactic systems. Simple chemical models accounting for the sub-solar N/O ratio suggest that depletion cannot account for the high CO-to-HCN ratios. Given HCN formation requires high extinction (A_V > 4), low metallicity may yield reduced dust shielding and thus a high CO/HCN ratio. The turbulence and structure of GMCs in M33 are comparable to those found in other systems, so the differences are unlikely to result from different GMC properties. Since lower CO-to-HCN ratios are associated with the highest rates of star formation, we attribute the deficits in part to evolutionary effects within GMCs.
Severe gastrointestinal strongyloidiasis
Lambertucci José Roberto,Westin Mateus Rodrigues,Barbosa Alfredo José Afonso
Revista da Sociedade Brasileira de Medicina Tropical , 2005,
Abstract:
CONTRIBUCIONES A LA BIOTA LIQUéNICA FOLIíCOLA DE COLOMBIA. I. NUEVOS REGISTROS DEL GéNERO COENOGONIUM (ASCOMYCOTAOSTROPALES: COENOGONIACEAE)
Mateus,Nancy; Lücking,Robert; Aguirre-C.,Jaime;
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales , 2011,
Abstract: six species of the genus coenogonium are reported for the first time for colombia: coenogonium barbatum, coenogonium geralense, coenogonium lisowskii, coenogonium minimum, coenogonium moniliforme and coenogonium siquirrense. all originate from the estación ambiental de tutunendó in the department of chocó (colombia).
Programa de Capacitación y Participación Comunitaria para la toma de Medidas Preventivas en la Recolección y Control del Caracol Africano (Achatina fulica) en el Sector “Coco e’ Mono”, municipio Palavecino, estado Lara
Lucena Gabriela,Pineda María,Puche Yahiny,Loreto Alfredo
Revista del Colegio de Médicos Veterinarios del Estado Lara , 2012,
Abstract: Actualmente existe una problemática muy poco conocida como lo es la proliferación del Caracol Africano (Achatina fulica), el cual es una de las cien especies invasoras más da inas de nuestro planeta. Es una plaga exótica que posee la capacidad de ser hermafrodita, por lo que se reproducen fácilmente. La desinformación de la población agranda el problema, por no saber las afectaciones que causa a nuestros intereses humanos y el desbalance que ocasiona en el ecosistema. Atendiendo a lo anterior, el presente proyecto de investigación tuvo como objetivo principal elaborar un programa de capacitación y participación comunitaria para la toma de medidas preventivas en la recolección y control del Caracol Africano (Achatina fulica) en el sector “Coco é Mono”, municipio Palavecino, Estado Lara. La metodología se desarrollo según los parámetros de una investigación descriptiva de campo, enfocándose además bajo la modalidad de un proyecto especial. En primer lugar, se aplicó un instrumento tipo encuesta a una muestra de 50 familias de las 250 que conforman la población total, el cual buscaba medir la necesidad de aplicar el programa de capacitación tomándose esta como la única variable del presente proyecto de investigación, mediante dos dimensiones: conocimiento y actitud. Habiendo aplicado dicho instrumento, se paso al análisis e interpretación de los resultados, lo cual arrojo, en líneas generales, niveles tanto de conocimiento y actitud, bajos. En consecuencia, se comenzó a aplicar el programa de capacitación.
Diferencias en la agregación plaquetaria de sangre coronaria y periférica de pacientes con enfermedad coronaria: Implicaciones clínicas
Cabrales,Jaime; Echeverri,Darío; Corzo,Orlando; Pineda,Mauricio;
Revista Colombiana de Cardiología , 2010,
Abstract: introduction: thrombotic events are more frequent in the coronary arteries and apparently the changes in rheology and endothelial surface produced by atheroesclerotic disease are responsible for this phenomenon. objetive: quantify the difference in platelet aggregation of coronary venous blood and peripheral venous blood in patients with severe coronary disease. methodology: we selected patients older than 30 years with severe coronary disease and obtained samples of peripheral and coronary sinus blood. platelet aggregation was realized by the absorbance method with adp 10 mmol, arachidonic acid (aa), epinephrine (epi) 300 mmol and collagen 10 ug/ml. results: we included a total of 32 patients with mean age 65 ± 10 years. 22 were men; 10 patients (31%) had stable disease and 22 (69%) unstable disease. platelet aggregation in coronary sinus blood was higher with all agonists used as follows: adp 61.8% vs. 53.4% (p = 0.001), aa 15.1% vs.13.8% (p = 0.48), collagen 72.6% vs. 69.2% (p = 0.048) and epi 58% vs. 51.6% (p = 0.01). patients with unstable disease show increased aggregation with adp in the coronary sinus 58.5% vs. 49.2% (p = 0.001) and there are no differences in the unstable. aspirin resistance was similar (p = 1); however, clopidogrel resistance was higher in the coronary sinus 56% vs. 48% (p = 0.24). conclusion: we describe the presence of higher platelet aggregation in the coronary sinus of patients with atheroesclerotic disease that is significant for adp, collagen and epinephrine, and suggest the appearance of local factors associated with the coronary disease that increase platelet aggregation. peripheral platelet aggregation doesn't reflect the local behavior in patients with coronary atheroesclerosis.
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