En busca de la cubanidad

Hay necesidades que se convierten en problemáticas priorizadas en cada historiografía nacional; hay procesos sociales que marcan la psicología, las mentalidades y la historia de cada pueblo, lo ayudan a identificarse, a definir su ‘cultura nacional’; En este artículo, se expone el caso de Cuba, y la  necesidad vital del pueblo de autodefinirse. A lo largo del texto, se exponen cuatro elementos que según el autor han contribuido peligrosamente a la creación de un laberinto, que poco ha ayudado a entender la formación y caracterización de la cubanidad: el primero, el nominalismo categorial, el segundo  la definición a partir de esquemas teóricos que poco tienen que ver con la historia, el tercero, la tendencia a considerar solamente obras antiguas, y por último el debate de la historia sin historia. Finalmente, para el autor, lo esencial de la cubanidad es el resultado de fases y etapas en la formación de la nación. Libérrima, alegre, fuerte, retadora y siempre situada en el límite de todos los límites, la cubanidad es la necesidad de ser y la obligación de buscar su deber ser

Plan prospectivo y estratégico retos y desafíos de la deserción estudiantil en la educación superior en Colombia al año 2027

Anexos incluidos en el documentoEl trabajo contempla un plan Prospectivo y Estratégico para los retos y desafíos de la deserción estudiantil a nivel profesional en Colombia al año 2027; a partir de la investigación de fuentes bibliográficas, tomando opinión de diferentes expertos sobre el tema quiénes permitieron determinar los actores y factores de cambio que influyen en el estudio. Los datos fueron tabulados y consolidados a partir de herramientas de métodos prospectivos, arrojando resultados y datos cuantitativos y cualitativos que permitieron analizar todas las variables, divergencias, convergencias, políticas y actores que influyen en el escenario más apropiado para desarrollar el plan estratégico y así reducir el índice de deserción estudiantil.The work contemplates the realization of a Prospective and Strategic plan for the challenges and challenges of student dropout at professional level in Colombia to the year 2027; from the research of bibliographical sources, it was taken the opinion of different experts on the subject who from their experience allowed to determine the actors and factors of change that influence in the study. The data were tabulated and consolidated using tools of prospective methods, which yielded results and quantitative and qualitative data that allowed to analyze all the variables, Divergences, convergences, policies and actors that influence the most appropriate scenario to develop the strategic plan and thus reduce the dropout rate

Quality assurance of the solar UV network in the Antarctic

Measuring ultraviolet radiation in the Antarctic region, where weather conditions are extremely challenging, is a demanding task. Proper quality control of the measurements and quality assurance of the data, which are the basis of all scientific use of data, has to be especially well planned and executed. In this paper we show the importance of proper quality assurance and describe the methods used to successfully operate the NILU-UV multichannel radiometers of the Antarctic network stations at Ushuaia, 54S, and Marambio, 64S. According to our experience, even though multichannel instruments are supposed to be rather stable as a function of time, severe drifts can occur in the sensitivity of the channels under these harsh conditions. During 2000–2003 the biggest drifts were 35%, both at Ushuaia and Marambio, with the sensitivity of the channels dropping at different rates. Without proper corrections in the data, this would have seriously affected the calculated UV dose rates. As part of the quality assurance of the network a traveling reference NILU-UV, which was found to be stable, was used to transfer the desired irradiance scale to the site NILU-UV data. Relative lamp tests were used to monitor the stability of the instruments. Each site NILU-UV was scaled channel by channel to the traveling reference by performing solar comparisons. The method of scaling each channel separately was found to be successful, even though the differences between the raw data of the site NILU-UV and the reference instruments were, before the data correction, as much as 40%. After the correction, the mean ratios of erythemally weighted UV dose rates measured during the solar comparisons in 2000–2003 between the reference NILU-UV and the site NILU-UV were 1.007 ± 0.011 and 1.012 ± 0.012 for Ushuaia and Marambio, respectively, when the solar zenith angle varied up to 80. These results make possible the scientific use of NILU-UV data measured simultaneously at quite different locations, e.g., the Antarctic and Arctic, and the method presented is also practicable for other multichannel radiometer networks.S, and Marambio, 64S. According to our experience, even though multichannel instruments are supposed to be rather stable as a function of time, severe drifts can occur in the sensitivity of the channels under these harsh conditions. During 2000–2003 the biggest drifts were 35%, both at Ushuaia and Marambio, with the sensitivity of the channels dropping at different rates. Without proper corrections in the data, this would have seriously affected the calculated UV dose rates. As part of the quality assurance of the network a traveling reference NILU-UV, which was found to be stable, was used to transfer the desired irradiance scale to the site NILU-UV data. Relative lamp tests were used to monitor the stability of the instruments. Each site NILU-UV was scaled channel by channel to the traveling reference by performing solar comparisons. The method of scaling each channel separately was found to be successful, even though the differences between the raw data of the site NILU-UV and the reference instruments were, before the data correction, as much as 40%. After the correction, the mean ratios of erythemally weighted UV dose rates measured during the solar comparisons in 2000–2003 between the reference NILU-UV and the site NILU-UV were 1.007 ± 0.011 and 1.012 ± 0.012 for Ushuaia and Marambio, respectively, when the solar zenith angle varied up to 80. These results make possible the scientific use of NILU-UV data measured simultaneously at quite different locations, e.g., the Antarctic and Arctic, and the method presented is also practicable for other multichannel radiometer networks.S. According to our experience, even though multichannel instruments are supposed to be rather stable as a function of time, severe drifts can occur in the sensitivity of the channels under these harsh conditions. During 2000–2003 the biggest drifts were 35%, both at Ushuaia and Marambio, with the sensitivity of the channels dropping at different rates. Without proper corrections in the data, this would have seriously affected the calculated UV dose rates. As part of the quality assurance of the network a traveling reference NILU-UV, which was found to be stable, was used to transfer the desired irradiance scale to the site NILU-UV data. Relative lamp tests were used to monitor the stability of the instruments. Each site NILU-UV was scaled channel by channel to the traveling reference by performing solar comparisons. The method of scaling each channel separately was found to be successful, even though the differences between the raw data of the site NILU-UV and the reference instruments were, before the data correction, as much as 40%. After the correction, the mean ratios of erythemally weighted UV dose rates measured during the solar comparisons in 2000–2003 between the reference NILU-UV and the site NILU-UV were 1.007 ± 0.011 and 1.012 ± 0.012 for Ushuaia and Marambio, respectively, when the solar zenith angle varied up to 80. These results make possible the scientific use of NILU-UV data measured simultaneously at quite different locations, e.g., the Antarctic and Arctic, and the method presented is also practicable for other multichannel radiometer networks.. These results make possible the scientific use of NILU-UV data measured simultaneously at quite different locations, e.g., the Antarctic and Arctic, and the method presented is also practicable for other multichannel radiometer networks.Fil: Lakkala, K.. Finnish Meteorological Institute; FinlandiaFil: Redondas, A.. Instituto Nacional de Meteorología; EspañaFil: Meinander, O.. Finnish Meteorological Institute; FinlandiaFil: Torres ,Carlos. Instituto Nacional de Meteorología; EspañaFil: Koskela, T.. Finnish Meteorological Institute; FinlandiaFil: Cuevas, Eduardo. Instituto Nacional de Meteorología; EspañaFil: Taalas, P.. Finnish Meteorological Institute; FinlandiaFil: Dahlback, A.. University of Oslo; NoruegaFil: Deferrari, Guillermo Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; ArgentinaFil: Edvardsen, K.. Instituto Noruego de Investigación del Aire; NoruegaFil: Ochoa, H.. Ministerio de Relaciones Exteriores, Comercio Interno y Culto. Dirección Nacional del Antártico. Instituto Antártico Argentino; Argentin

Desarrollo de applets para la conceptualización de la integral definida

La propuesta metodológica de Salinas, Alanís, Pulido, Santos, Escobedo y Garza (2012) para la enseñanza del cálculo integral, introduce la necesidad de calcular la magnitud de un todo, dividiéndolo en partes por medio de conceptos de geometría y sumándolas para calcular aproximaciones para una magnitud bajo estudio, mejorando dichas aproximaciones al aumentar el número de divisiones, hasta deducir las fórmulas de integración utilizadas para encontrar el valor exacto. Este procedimiento en la práctica normalmente se realiza a mano, pero si se cuenta con los medios tecnológicos, el capacitar a los profesores en el uso de las nuevas tecnologías permite mejorar la práctica docente, por lo que se desarrolla un taller donde a través de la construcción de applets de GeoGebra se profesionaliza al profesor en su uso para el posterior desarrollo de actividades didácticas

Evaluación electroquímica de dihidrobenzo [4,5] imidazo- [1,2c] quinazolinas para el control de la corrosión del acero API 5L X 120 en medio ácido

En el presente trabajo se determinó la eficiencia de inhibición para los compuestos orgánicos 2,6'diFDHBIQz 1 y 2Br2',6diFDHBIQz 2, para el control de la corrosión en un acero API SLX120 en un medio acido 0.5M HCI, usando técnicas electroquímicas como: Espectroscopía de impedancia electroquímica y curvas de polarización Potenciodinámicas, obteniendo una eficiencia del 94% a 200ppm en el inhibidor 1 (2',6'diFDHBIQz 1)y 93%a 100 y 150ppm en el inhibidor 2 (2Br2',6diFDHBIQz 2), a temperatura ambiente, después de realizar los ajustes con circuitos eléctricos equivalentes.In this paper the inhibition efficiency for organic compounds 2',6dFDHBIQz_1'diFDHBIQz_1 _and 2_Br2',6diFDHBIQz_2 diFDHBIQz_2 was determined for the control of corrosion in an API SL X120 steel in an acidic medium 0.5M HCI, using electrochemical techniques such as: Electrochemical impedance spectroscopy and polarization curves Potentiodynamics, obtaining an efficiency of 94% at 200ppm in inhibitor 1 (2,6diFDHBIQz 1) and 93% at 100 and 150ppm in inhibitor 2 (2Br2',6diFDHBIQz 2), at room temperature, after making adjustments with equivalent electrical circuits

Conservando tiburones con ciencia ciudadana

El proyecto se gesta en colaboración de los proyectos de investigación y preservación de condrictios “Análisis poblacional y migratorio del cazón (Galeorhinus galeus) en el Atlántico Sudoccidental” y “Filogeografía aplicada a la conservación del gatopardo (Notorynchus pectorosus, Chondrichthyes) en el Mar Argentino” de la Facultad de Ciencias Naturales y Museo de la UNLP.Facultad de Informátic

Conservando tiburones con ciencia ciudadana

El proyecto se gesta en colaboración de los proyectos de investigación y preservación de condrictios “Análisis poblacional y migratorio del cazón (Galeorhinus galeus) en el Atlántico Sudoccidental” y “Filogeografía aplicada a la conservación del gatopardo (Notorynchus pectorosus, Chondrichthyes) en el Mar Argentino” de la Facultad de Ciencias Naturales y Museo de la UNLP.Facultad de Informátic

Conservando tiburones con ciencia ciudadana

El proyecto se gesta en colaboración de los proyectos de investigación y preservación de condrictios “Análisis poblacional y migratorio del cazón (Galeorhinus galeus) en el Atlántico Sudoccidental” y “Filogeografía aplicada a la conservación del gatopardo (Notorynchus pectorosus, Chondrichthyes) en el Mar Argentino” de la Facultad de Ciencias Naturales y Museo de la UNLP.Facultad de Informátic