Suchergebnisse

This research article intends to analyze the current systems of designation or election of rectors in the public universities of Colombia, an aspect that will be studied focused from the perspective of the participation of the student sector and examined in the light of the principles of Participatory democracy and university autonomy, as two pillars or constitutional institutions, around which some sort of tension may emerge. ; En este artículo de investigación se pretende realizar un análisis de los sistemas actuales de designación o elección de rectores en las universidades públicas de Colombia, aspecto que se estudiará enfocado desde la perspectiva de la participación del sector estudiantil y examinado a la luz de los principios de la democracia participativa y la autonomía universitarias, como dos pilares o instituciones constitucionales, en torno a las cuales pueda desprenderse cierta suerte de tensión.

Dissolution of different types of MgO based refractories into molten CaO-Al2O3-MgO-SiO2 slag was studied at 1873 K. The prepared refractory cubes were dissolved in both stagnant slagand slag stirred with different speeds. Even in a stagnant slag, the decarbonized commercial MgO-carbon refractory dissolved very fast. Formation of micro spinel particles by addition of either colloidal alumina or micro alumina powder in the MgO matrix efficiently reduced the dissolution. The dissolution of MgO refractories into slag was found to be controlled by the slag penetration into the MgO matrix. In the case of stagnant slag, the slag penetration would lead to the final dissociation of the decarbonized commercial MgO-carbon cube in less than 6 minutes. A slag penetrated layer was formed in the cubes with spinel particles formed in situ.The major dissolution took place between the MgO grains and the liquid in this penetrated layer. The increase of the thickness would slow down the dissolution process. In the case of forced convection, the slag penetrated layer was removed at high stirring speeds and partially removed at lower stirring speeds. The removal of the penetrated layer would enhance the dissolution process. ; QCR 20170918 ; European Union's Research Fund for Coal and Steel (RFCS) research program [grant agreement No RFSR-CT-2015-00005]

Una de las formas de expresarse colectivamente las personas es a través de la protesta social, la cual no debe ser limitada ni restringida, en la medida que respete derechos de otros. Una manifestación especial dentro del amplio espectrode las variantes de la protesta social es la que se deriva de los movimientos estudiantiles, quizás por todo el vigor y juventud que le imprimen a sus demandas. De hecho, los estudiantes han sido uno de los actores más representativos y quehan logrado grandes conquistas, como toda su participación significativa en el movimiento de la séptima papeleta que desembocó en un proceso constituyente.