Magmatic evolution of the Nevado del Ruiz volcano, Central Cordillera, Colombia : mineral chemistry and geochemistry

A partir de nouvelles données pétrographiques, minéralogiques et géochimiques, les auteurs réalisent une caractérisation géochimique des laves du Nevado del Ruiz (éruptions quaternaires, historiques et récentes) et des formations volcaniques du Pliocène des pentes de la Cordillère central

Ingenieria e Investigacion

This paper presents a method to calculate the energy production of photovoltaic generators considering partial shading or mismatched conditions. The proposed method is based on the complete one-diode model including the bypass diode in its exponential form, where the current and voltage values of the modules composing the photovoltaic panel array are calculated without using the Lambert-W function. In addition, the method introduces a procedure to calculate the vicinity of the maximum power points, which enables the reduction of the operations required to obtain the global maximum. The proposed method provides short simulation times and high accuracy. On the other hand, since the method does not require complex mathematical functions, it can be implemented straightforwardly on known software packages and development languages such as C and C++. Those characteristics make this method a useful tool to evaluate the economic viability and return-of-investment time of photovoltaic installations. Simulation results and comparisons with a classical procedure confirm the good performance of the proposed method in terms of execution time and accuracy

Magmatic evolution of the Nevado del Ruiz volcano, Central Cordillera, Colombia : mineral chemistry and geochemistry

A partir de nouvelles données pétrographiques, minéralogiques et géochimiques, les auteurs réalisent une caractérisation géochimique des laves du Nevado del Ruiz (éruptions quaternaires, historiques et récentes) et des formations volcaniques du Pliocène des pentes de la Cordillère central

A review of lipase immobilization on hydrophobic supports incorporating systematic mapping principles

A review of the literature covering research on the immobilization of lipases on hydrophobic supports was performed using systematic mapping (SM) concepts. This approach consists of a rigorous review of the methodology used to catalog evidence, to identify gaps at the frontier of knowledge, to identify unknown trends, and to list research groups. Our results show a wide variety of available lipases, including commercial, wild-type and recombinant strains. However, the most commonly used lipases are lipases from Thermomyces lanuginosus (TLL), Candida rugosa (CRL) or Rhizomucor miehei (RML) and lipase B from Candida antarctica (CALB). A wide variety of supports with different degrees of hydrophobicity were identified and the supports activated with a layer of octyl or octadecyl groups were the most commonly used. The advantages of lipase immobilization on these supports are discussed. Among them, the immobilization, purification, stabilization and hyperactivation of lipases in a single step stand out. Moreover, problems related to lipase immobilization by interfacial activation are highlighted (mainly enzyme release). Strategies to overcome these problems include immobilization on heterofunctional supports or intermolecular crosslinking of enzymes immobilized by physical and/or chemical agents. The possibility of increasing the capacity of supports by lipase multilayer immobilization is also discussed. Finally, the structure, distribution of the network and the frequency of co-occurrence between lipases and supports are elucidated to determine the possible hotspots and hitherto unexplored advances in knowledge. © 2023 The Royal Society of ChemistryThis work was funded by São Paulo Research Foundation (FAPESP, grant number 2016/10636-8), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES, Finance Code 001), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, project numbers 405889/2016-0 and 308212/2017-7), Ministerio de Ciencia e Innovación and Agencia Estatal de Investigación (Spanish Government) (project PID2022-136535OB-I00 and MCIN/AEI/10.13039/501100011033/) and by FEDER A Way of Making Europe funds (project PID2021-123079OB-I00), and Generalitat Valenciana (CIPROM/2021/70).Peer reviewe

Modelling the Human and Technological Costs and Benefits of USB Memory Stick Security

Organizations deploy systems technologies in order to support their operations and achieve their business objectives. In so doing, they encounter tensions between the confidentiality, integrity, and availability of information, and must make investments in information security measures to address these concerns. We discuss how a macroeconomics-inspired model, analogous to models of interest rate policy used by central banks, can be used to understand trade-offs between investments against threats to confidentiality and availability. We investigate how such a model might be formulated by constructing a process model, based on empirically obtained data, of the use of USB memory sticks by employees of a financial services company.

Video games as a complementary therapy tool in mental disorders: PlayMancer, a European multicentre study

Background: Previous review studies have suggested that computer games can serve as an alternative or additional form of treatment in several areas (schizophrenia, asthma or motor rehabilitation). Although several naturalistic studies have been conducted showing the usefulness of serious video games in the treatment of some abnormal behaviours, there is a lack of serious games specially designed for treating mental disorders. Aim: The purpose of our project was to develop and evaluate a serious video game designed to remediate attitudinal, behavioural and emotional processes of patients with impulse-related disorders. Method and results: The video game was created and developed within the European research project PlayMancer. It aims to prove potential capacity to change underlying attitudinal, behavioural and emotional processes of patients with impulse-related disorders. New interaction modes were provided by newly developed components, such as emotion recognition from speech, face and physiological reactions, while specific impulsive reactions were elicited. The video game uses biofeedback for helping patients to learn relaxation skills, acquire better self-control strategies and develop new emotional regulation strategies. In this article, we present a description of the video game used, rationale, user requirements, usability and preliminary data, in several mental disorders