En este artículo presentamos cuatro de las innumerables tecnologías que fueron desarrolladas durante la segunda Guerra Mundial y de las que sus variantes hoy en día tienen un uso imprescindible en nuestro diario vivir

Con la integración masiva de fuentes de energía renovable, principalmente eólica y solar, la flexibilidad de los sistemas de potencia tiene especial importancia, pues es necesaria para responder a la naturaleza variable e intermitente de estas fuentes. Además de la flexibilidad, la integración masiva de fuentes renovables trae consigo otros retos y requerimientos en la planificación y operación habitual del sistema de potencia. Los mismos son de naturaleza, no solo técnica, sino también económica, regulatoria y socio-ambiental. Este trabajo de divulgación tecnológica, basado en una revisión de literatura especializada, proporciona una visión general de los retos y posibles soluciones que se tienen con la integración masiva de fuentes de energía renovable variables, principalmente, eólica y solar a nivel de grandes generadores. Particularmente, se trata el reto de la flexibilidad y sus problemas asociados, así como sus posibles soluciones de carácter técnico. De la visión general expuesta, se extraen varias ideas conclusivas en este trabajo, resaltando que para una integración de energías renovables efectiva y eficiente en los sistemas de potencia es necesario aumentar la flexibilidad de los mismos, lo que exige repensar la planificación, el diseño, y la operación de los sistemas de una forma holística incluyendo elementos técnicos, económicos, ambientales y sociales.

Pathological processes often change the mechanical properties of cells. Increased rigidity could be a marker of cellular malfunction. Erythrocytes are a type of cell that deforms to squeeze through tiny capillaries; changes in their rigidity can dramatically affect their functionality. Furthermore, differences in the homeostatic elasticity of the cell can be used as a tool for diagnosis and even for choosing the adequate treatment for some illnesses. More accurate types of equipment needed to study biomechanical phenomena at the single-cell level are very costly and thus out of reach for many laboratories around the world. This study presents a simple and low-cost technique to study the rigidity of red blood cells (RBCs) through the application of electric fields in a hand-made microfluidic chamber that uses a capacitor principle. As RBCs are deformed with the application of voltage, cells are observed under a light microscope. From mechanical force vs. deformation data, the elastic constant of the cells is determined. The results obtained with the capacitor-based method were compared with those obtained using optical tweezers, finding good agreement. In addition, P. falciparum-infected erythrocytes were tested with the electric field applicator. Our technique provides a simple means of testing the mechanical properties of individual cells.

This work is related to the hyperelastic models most used in soft tissue. The importance of obtaining accurate mechanical properties of tissues are of great interest for various medical applications, for example: in treatment of diseases and surgical simulations in real time. The aim of this literature review is to evaluate the models used for proposing a mathematical formulation and modelling the mechanical behaviour of a sequence of layers of soft tissues and your reply to undergo external actions of mechanical nature, in order to improve the techniques of characterization of soft tissues.Keywords: Biomechanical, Hyperelasticity, Mechanical Properties, Nonlinear elasticity, Soft Tissues.

Renewable energy resources have gained relevance in countries worldwide as an alternative to diversify, in a more environmentally amicable manner, its energy matrix. However, even though the use of the resource might be considered as a step forward towards achieving sustainability, in terms of the power plant, the environmental impact its only one aspect. Economic and social aspects should be study altogether with the environmental ones so that a holistic sustainability assessment can be provided. It is important to bear in mind that even though the impact of renewable power plants might be considered beneficial for a global area (for instance, a country) it might not be for the area where it is located, thus the relevance of a sustainability assessment. In this article we will perform a sustainability assessment study using two ideal scenarios of geothermal power plants projects for comparison. A set of sustainability indicators will be presented taking into account important aspects of geothermal power plants construction and operation while integrating the sustainability criteria.