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Search Results: 1 - 10 of 599947 matches for " Eduardo D'Acu?a "
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EVALUACIóN PRáCTICA DE ANATOMíA. RENDIMIENTO DE LOS ALUMNOS DE PRIMER A?O DE MEDICINA ANTE DISTINTAS FORMAS DE PREGUNTAR
Inzunza,Oscar; D'Acua,Eduardo; Bravo,Hermes;
International Journal of Morphology , 2003, DOI: 10.4067/S0717-95022003000200006
Abstract: to keep a high standard teaching anatomy, some innovations procedures have been introduded, to face facts such as diminution in the number of hours lectures, increase in the number of students, lack of cadaveric preparations and decrease in the number of available teachers. these innovation procedures include use of prosections, web pages with animated photographs, clinical images such as rx, tac, rnm. the practical test have incorporated questions related to these material which is available in the laboratory of anatomy and in the web site. this paper analize the performance of medical students in relation to the new form of asking questions related to the practical knowledge of anatomy. we compare the average grade of the students in six different types of questions: 1) cadaveric preparations shown in the laboratory, 2) animated photographs of the web, 3) rnm, 4) new cadaveric preparations 5) sectional anatomy and 6) rx. the analisis of the results shows that the students recognize easily the anatomical structures shown in the bidimensional figures (computer, rx, rnm). tridimensional preparation have more difficulty in the recognition of the anatomical structures. the difference in the average grades compare with the previous ones is statisticaly significant. the use of computer images to teach anatomy is an important help to the students. nevertheless the tridimentional understanding is not resolve by this teaching procedure. the study in the cadaveric preparations has its own value that can not be avoid
EVALUACIóN PRáCTICA DE ANATOMíA. RENDIMIENTO DE LOS ALUMNOS DE PRIMER A O DE MEDICINA ANTE DISTINTAS FORMAS DE PREGUNTAR PRACTICAL EVALUATION IN ANATOMY. PERFORMANCE OF FIRST YEAR MEDICAL STUDENTS IN RELATION TO DIFFERENT WAYS OF ASKING QUESTIONS
Oscar Inzunza,Eduardo D'Acua,Hermes Bravo
International Journal of Morphology , 2003,
Abstract: Los anatomistas hemos debido hacer innovaciones para mantener una ense anza de alto nivel, enfrentando factores como la disminución del horario lectivo, aumento del número de alumnos, falta de material cadavérico y de docentes. Los cambios incluyen el uso de disecciones preparadas con anticipación, desarrollo de una página Web con fotos animadas y el uso de imágenes clínicas (RX, TAC, RNM). Las pruebas prácticas del curso han incluido preguntas en este material, disponible en los pabellones de disección y en el sistema computacional. En este trabajo analizamos el rendimiento de los alumnos ante nuevas formas de evaluar el conocimiento práctico de Anatomía. Se compararon los puntajes obtenidos por los estudiantes en seis tipos de preguntas de reconocimiento en: 1.- Preparaciones cadavéricas que han visto con anterioridad. 2.- Fotos animadas de la página Web del curso. 3.- Imágenes de resonancia nuclear. 4.- Preparaciones anatómicas nuevas. 5.-Secciones anatómicas. 6.- Radiografías. El análisis estadístico de los resultados demostró que los alumnos reconocen con facilidad estructuras anatómicas en planos bidimensionales como la pantalla del computador o RX, presentando una complejidad mayor la identificación de elementos en las preparaciones cadavéricas o secciones de segmentos corporales; diferencias que son estadísticamente significativas. La utilización de imágenes anatómicas computacionales representan un apoyo importante a las actividades prácticas. Sin embargo, subsiste el problema de la concepción tridimensional de la estructura anatómica, que no alcanza a ser resuelta por el uso de las imágenes; resaltando el valor de las disecciones anatómicas en este tipo de cursos To keep a high standard teaching Anatomy, some innovations procedures have been introduded, to face facts such as diminution in the number of hours lectures, increase in the number of students, lack of cadaveric preparations and decrease in the number of available teachers. These innovation procedures include use of prosections, web pages with animated photographs, clinical images such as RX, TAC, RNM. The practical test have incorporated questions related to these material which is available in the laboratory of Anatomy and in the web site. This paper analize the performance of medical students in relation to the new form of asking questions related to the practical knowledge of Anatomy. We compare the average grade of the students in six different types of questions: 1) Cadaveric preparations shown in the laboratory, 2) Animated photographs of the web, 3) RNM, 4) New cadaveric prepa
Analysis of BOP-F polymer by Neutron Activation
Héctor René Vega-Carrillo,Eduardo Manzanares-Acua,Víctor Martín Hernández-Dávila,Gema A. Mercado
Revista de la Sociedad Química de México , 2006,
Abstract: Se utilizó la técnica de Análisis por Activación con Neutrones para determinar la concentración de elementos nocivos en fibras de polímero biocompatible con tejido óseo (BOP-F). Este material se emplea como sustituto cuando se produce da o a nivel del hueso. El análisis se realizó utilizando neutrones térmicos. Durante el análisis, las muestras se irradiaron bajo dos esquemas de tiempo, corto y largo. Se encontró que las fibras de BOP contienen Na y Br cuya razón es similar a la que existe en los fluidos del cuerpo humano.
Attenuation of UV-C Solar Radiation as a Function of Altitude (0 ≤ z ≤ 100 km): Rayleigh Diffusion and Photo Dissociation of O2 Influence  [PDF]
José Luis Pinedo-Vega, Carlos Ríos-Martínez, David Jacobo Navarro-Solís, J. Ignacio Dávila-Rangel, Fernando Mireles-García, Sonia Azucena Saucedo-Anaya, Eduardo Manzanares-Acua, Valentín Badillo-Almaraz
Atmospheric and Climate Sciences (ACS) , 2017, DOI: 10.4236/acs.2017.74039
Abstract: In this paper, we present an analysis of attenuation for UV-C radiation (\"\") as a function of the altitude z (\"\") by calculating the interaction ratio between the UV-C radiation and the molecular species susceptible of interact with UV-C radiation. The Rayleigh scattering spectral cross sections were calculated, the UV-C spectral cross sections of the species susceptible of interact with UV-C radiation and the UV extraterrestrial (ETR) solar spectrum were standardized with wavelength steps of 1 nm, and The International Standard Atmosphere model (ISO 1972) was adapted to calculate the molecular density. These data were utilized to calculate the photodissociation and Rayleigh scattering ratios as a function of the altitude and to determine to what measure the photodissociation and the Rayleigh diffusion were determinants of the attenuation of UV-C radiation. It became clear that the photo dissociation of O2 is the primordial mechanism of attenuation for the UV-C radiation, but the Rayleigh diffusion appears like a mechanism that encreases the photon flux, raising the performance of the O2 photodissociation. The attenuation capacities of N2O, CO2 and water vapor (H2O) over the UV-C radiation are all similar, although smaller (less than 0.6%), and this is due to their low concentration. The O3, has the theoretical greater attenuation capacity, but it is found in mid-range altitudes? (\"\"), where the residual UV-C photons has almost vanished by O2 photo dissociation or Rayleigh diffusion, so the real effect over the UV-C attenuation is minimum.
Evaluación retrospectiva para determinar la oportunidad de raleo en un rodal de pino oregón de 24 a?os
DRAKE,FERNANDO; ACUA,EDUARDO; SALAS,SOLEDAD;
Bosque (Valdivia) , 2003, DOI: 10.4067/S0717-92002003000200010
Abstract: a methodology to determine the thinning opportunity in an unmanaged 24-year-old douglas fir (pseudotsuga menziesii (mirb.) franco) stand was studied. starting from information on cumulative growth and the mean annual increment (mai) of the diameter at breast height (dbh), the age at which the maximum mai was reached was determined. the basal area by hectare at which the maximum mai was reached was then retroprojected. considering the methodology used, a thinning program was proposed in which 775 trees per hectare were left. four years after intervention, the stand effect of thinning on the remaining trees was evaluated. the number of trees remained constant and there was no presence of mortality. the basal area grew by 4.8 m3/year on average, with a cumulative annual increment of 28.35 m3/ha per year, which was 40.00 m3/ha per year in the last four years.
Análisis del riesgo en la gestión forestal e inversiones silviculturales: una revisión bibliográfica
ACUA CARMONA,EDUARDO; DRAKE ARANDA,FERNANDO;
Bosque (Valdivia) , 2003, DOI: 10.4067/S0717-92002003000100009
Abstract: the determination of optimum silvicultural regimes has been based traditionally on the assumption that all results from management activities are without risk. decision strategies in forest management must be based on a solid knowledge of the cause and effect relationships between silvicultural requirements and financial dynamics. in this paper, the relevant literature is reviewed in order to incorporate risk analysis into both silvicultural investment and forest management.
Una aplicación de apoyo a la toma de decisiones para el costeo de maquinarias de cosecha forestal
Acua, Eduardo;Drake, Fernando;Garcias, Marco;
Revista árvore , 2011, DOI: 10.1590/S0100-67622011000100020
Abstract: for years the forestry companies and especially that serve of logging have implemented the computation like a work tool, this has allowed to automate the decision making. the intention of this practical one is to obtain that the forest sector continues being competitive international level, for so objective becomes necessary to optimize the different activities that participate in the forest production. the costs associated to the task of logging are those of greater incidence within the operative plans, for that reason it is important to have knowledge of his real effects in the calculation of the tariffs. the work carried out consisted of developing an applications package and consults for the structuring and tariff to receive for a task of logging, developed in the visual basic programming language. sicofor 1.0.1 to the being compared with other spreadsheet as for example the developed ones in microsoft excel give a greater facility of work, allows to update the data bases of the machinery to use, personnel, administration and implementation of work for each system of advantage, in addition it gives the tariff in detail to receive. although really those that determine the tariffs of the different services are the companies plaintiffs of the services, the development of the program as tool of support to the decision making, continues being useful to compare the tariff that the ordering forest company offers and the real costs of the service of harvest, to make the decision to accept or to misestimate the business.
Análisis del riesgo en la gestión forestal e inversiones silviculturales: una revisión bibliográfica Risk analysis in forest management and silvicultural investments: a literature review
EDUARDO ACUA CARMONA,FERNANDO DRAKE ARANDA
Bosque (Valdivia) , 2003,
Abstract: La determinación de los regímenes silviculturales óptimos ha estado basada, tradicionalmente, en el supuesto de que todo resultado de las actividades de manejo sea seguro. La toma de decisiones en la gestión forestal debe partir por un profundo conocimiento en las relaciones causa/efecto que existen entre las prescripciones silvícolas y su comportamiento financiero. En este artículo se desarrolla una revisión bibliográfica para incorporar el riesgo en inversiones silviculturales, así como en el manejo forestal. The determination of optimum silvicultural regimes has been based traditionally on the assumption that all results from management activities are without risk. Decision strategies in forest management must be based on a solid knowledge of the cause and effect relationships between silvicultural requirements and financial dynamics. In this paper, the relevant literature is reviewed in order to incorporate risk analysis into both silvicultural investment and forest management.
Evaluación retrospectiva para determinar la oportunidad de raleo en un rodal de pino oregón de 24 a os Retrospective evaluation to determine a thinning opportunity in a 24-year-old Douglas-fir stand
FERNANDO DRAKE,EDUARDO ACUA,SOLEDAD SALAS
Bosque (Valdivia) , 2003,
Abstract: Fue estudiada una metodología para determinar la oportunidad de raleo en un rodal de pino oregón (Pseudotsuga menziesii (Mirb.) Franco) de 24 a os sin manejo. A partir de información de crecimiento acumulado e incremento medio anual (IMA) en el diámetro a la altura de pecho (DAP) se determinó la edad en que se alcanzó el máximo IMA en esta variable y posteriormente se retroproyectó la tabla de rodal hasta obtener el área basal por hectárea que logró el máximo IMA en DAP. Considerando la metodología empleada se propuso y llevó a cabo un raleo, se dejaron 775 árboles por hectárea. Transcurrido cuatro a os de la intervención, se evaluó el rodal para ver el efecto del raleo sobre los árboles remanentes. El número de árboles permaneció constante, sin presencia de mortalidad, el área basal creció en promedio 4,8 m3x a o-1, con un incremento anual acumulado de 28,35 m3xha-1x a o-1 y el de los últimos cuatro de 40 m3xha-1xa o-1. A methodology to determine the thinning opportunity in an unmanaged 24-year-old Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) stand was studied. Starting from information on cumulative growth and the mean annual increment (MAI) of the diameter at breast height (DBH), the age at which the maximum MAI was reached was determined. The basal area by hectare at which the maximum MAI was reached was then retroprojected. Considering the methodology used, a thinning program was proposed in which 775 trees per hectare were left. Four years after intervention, the stand effect of thinning on the remaining trees was evaluated. The number of trees remained constant and there was no presence of mortality. The basal area grew by 4.8 m3/year on average, with a cumulative annual increment of 28.35 m3/ha per year, which was 40.00 m3/ha per year in the last four years.
Presentación clínica y evolución alejada de los derrames pericárdicos crónicos severos idiopáticos
Gabe,Eduardo D.; Santos,José M.; Casabé,J. Horacio; Rodríguez Acua,María I.; Pizzi,Nazarena; Robles,Federico; Escarain,Carolina; Salvatori,Carolina; Boughen,Roberto P.; Favaloro,Roberto R.;
Revista argentina de cardiolog?-a , 2007,
Abstract: objective to assess the frequency, clinical presentation, diagnostic methods, treatment, outcome and long-term prognosis of patients with severe chronic idiopathic pericardial effusion. material and methods all patients in whom severe pericardial effusion was suspected were assessed prospectively from june 1992 to april 2005, using our institution's protocol for the evaluation of pericardial disease. of a total of 152 patients, 54 had severe chronic pericardial effusion; in 28 of them (52%) the effusion was categorized as idiopathic and they were hence included in this study. results mean age was 67 ± 11 years and 82% were men; 25 (89.3%) were symptomatic due to dyspnea, 4 (16%) had cardiac tamponade and 10 (35.7%) had incipient echocardiographic signs of cardiac tamponade. mean follow-up was 60 months (3- 128 months). the three asymptomatic patients were not drained and had a favorable outcome (mean follow-up, 42 months). the 25 symptomatic patients were treated with pericardial drainage and 23 were followed (2 patients were lost to follow-up). in 14 patients (60.8%) there was no evidence of recurrent effusion, 3 (13%) had mild effusion, 2 (8.6%) had moderate effusion and 4 (17.2 %) had severe effusion. of these 4 latter patients, 3 had dyspnea fc iii-iv, and thus required pericardiectomy, with a good subsequent outcome. the other patient remained asymptomatic. conclusions patients with severe chronic idiopathic pericardial effusion may remain asymptomatic for long periods of time. in most patients who develop severe symptoms, pericardial drainage is effective. in symptomatic patients with recurrence of severe effusion after drainage, pericardiectomy offers an effective solution.
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