Hydrothermal hydrolysis of starch with CO2 and detoxification of the hydrolysates with activated carbon for bio-hydrogen fermentation.

The imminent use of hydrogen as an energy vector establishes the need for sustainable production technologies based on renewable resources. Starch is an abundant renewable resource suitable for bio-hydrogen generation. It was hypothesised that starch hydrolysates from a large (250 mL) hydrothermal reactor could support bioH2 fermentation without inhibition by toxic byproducts.\ud \ud Starch was hydrolysed at high concentrations (40 200 g.L-1) in hot compressed water (HCW) with CO2 at 30 bar in a 250 mL reactor, the largest so far for polysaccharide hydrolysis, at 180 235 °C, 15 min. Hydrolysates were detoxified with activated carbon (AC) and tested in biohydrogen fermentations. The maximum yield of glucose was 548 g.kg starch 1 carbon at 200 °C. 5 hydroxymethyl furfural, the main fermentation inhibitor, was removed by AC to support 70% more hydrogen production than the untreated hydrolysates. The potential utilization of starch hydrolysates from HCW treatment for upscaled fermentations is promising

A role-based software architecture to support mobile service computing in IoT scenarios

The interaction among components of an IoT-based system usually requires using low latency or real time for message delivery, depending on the application needs and the quality of the communication links among the components. Moreover, in some cases, this interaction should consider the use of communication links with poor or uncertain Quality of Service (QoS). Research efforts in communication support for IoT scenarios have overlooked the challenge of providing real-time interaction support in unstable links, making these systems use dedicated networks that are expensive and usually limited in terms of physical coverage and robustness. This paper presents an alternative to address such a communication challenge, through the use of a model that allows soft real-time interaction among components of an IoT-based system. The behavior of the proposed model was validated using state machine theory, opening an opportunity to explore a whole new branch of smart distributed solutions and to extend the state-of-the-art and the-state-of-the-practice in this particular IoT study scenario.Peer ReviewedPostprint (published version

Real-Time Operating Systems and Programming Languages for Embedded Systems

In this chapter, we present the different alternatives that are available today for the development of real-time embedded systems. In particular, we will focus on the programming languages use like C++, Java and Ada and the operating systems like Linux-RT, FreeRTOS, TinyOS, etc. In particular we will analyze the actual state of the art for developing embedded systems under the WORA paradigm with standard Java [1], its Real-Time Specification and with the use of Real-Time Core Extensions and pico Java based CPUs [5]. We expect the reader to have a clear view of the opportunities present at the moment of starting a design with its pros and cons so it can choose the best one to fit its case.Fil: Orozco, Javier Dario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina. Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Laboratorio de Sistemas Digitales; ArgentinaFil: Santos, Rodrigo Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages". Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Instituto de Investigaciones en Ingeniería Eléctrica "Alfredo Desages"; Argentina. Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras. Laboratorio de Sistemas Digitales; Argentin

Methodology for Hydroelectric Potential Evaluation in High Jungle Area with Scarce Topographic and Hydrological Information Using GIS and Algorithm MATLAB

Due to scarcity of topographic and hydrological information in high jungle areas, many times projects based on water management are not developed. This is of interest because they involve hydroelectric generation projects. The latter are considered important because of their capacity to satisfy the energy demand of a population and to minimize environmental impact of energy generation. In this sense, we propose a methodology for hydroelectric potential evaluation in high jungle areas that considers the following steps: (a) develop an algorithm in MATLAB in charge of searching geographical conditions for hydroelectric power plant’s location, (b) definition of restrictions: political delimitation, environmental and demographic, (c) generation of average flows based on rainfall-runoff models, estimation of hydroelectric potential and economic evaluation of selected points. The high jungle area studied was Utcubamba basin, in department of Amazonas, Peru, where 2 possible locations with hydroelectric power of 5.33 and 6.09 MW were located

Scheduling Mandatory-Optional Real-Time Tasks in Homogeneous Multi-Core Systems with Energy Constraints Using Bio-Inspired Meta-Heuristics

In this paper we present meta-heuristics to solve the energy aware reward based scheduling of real-time tasks with mandatory and optional parts in homogeneous multi-core processors. The problem is NP-Hard. An objective function to maximize the performance of the system considering the execution of optional parts, the benefits of slowing down the processor and a penalty for changing the operation power-mode is introduced together with a set of constraints that guarantee the real-time performance of the system. The meta-heuristics are the bio-inspired methods Particle Swarm Optimization and Genetic Algorithm. Experiments are made to evaluate the proposed algorithms using a set of synthetic systems of tasks. As these have been used previously with an Integer Lineal Programming approach, the results are compared and show that the solutions obtained with bio-inspired methods are within the Pareto frontier and obtained in less time. Finally, precedence related tasks systems are analyzed and the meta-heuristics proposed are extended to solve also this kind of systems. The evaluation is made by solving a traditional example of the real-time precedence related tasks systems on multiprocessors. The solutions obtained through the methods proposed in this paper are good and show that the methods are competitive. In all cases, the solutions are similar to the ones provided by other methods but obtained in less time and with fewer iterations.Fil: Micheletto, Matías Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Ciencias e Ingeniería de la Computación; Argentina. Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras; ArgentinaFil: Santos, Rodrigo Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Ciencias e Ingeniería de la Computación; Argentina. Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras; ArgentinaFil: Orozco, Javier Dario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Ciencias e Ingeniería de la Computación; Argentina. Universidad Nacional del Sur. Departamento de Ingeniería Eléctrica y de Computadoras; Argentin

Active Disturbance Rejection Control for the Robust Flight of a Passively Tilted Hexarotor

This paper presents a robust control strategy for controlling the flight of a passively (fixed) tilted hexarotor unmanned aerial vehicle (UAV). The proposed controller is based on a robust extended-state observer to estimate and reject internal dynamics and external disturbances at run-time. Both stability and convergence of the observer are proved using Lyapunov-based perturbation theory and an ultimate bound approach. Such a controller is implemented within a highly realistic simulation environment that includes physics motors, devising an almost transparent behaviour with respect to the real UAV. The controller is tested for flying under normal conditions and in the presence of different types of disturbances showing successful results. Furthermore, the proposed control system is compared against another robust control approach, presenting a better performance regarding the attenuation of the error signals

Conocimientos que tienen los estudiantes y docentes sobre la Seguridad Alimentaria y Nutricional, en el centro de enseñanza técnico agropecuario Augusto Nicolás Calderón Sandino INATEC-Nueva Guinea, durante el Segundo Semestre del 2016

El presente documento corresponde a la tesis para optar al título de master de la Maestría Formación de Formadores de Docentes, y que tiene como fin evaluar los conocimientos que tienen los estudiantes y docentes del Centro de Enseñanza Técnico Agropecuario CETA – INATEC - Nueva Guinea, sobre la Seguridad Alimentaria y Nutricional. Considerando que el CETA-Nueva Guinea atiende estudiantes que en su mayoría proceden de familias rurales y del casco urbano de los departamentos de Rio San Juan, Chontales y RACCS, los cuales desconocen de los elementos que garantizan seguridad alimentaria y nutricional, estos conlleva a un consumo de alimentos que no satisface los requerimientos nutricionales, calidad e inocuidad; y que tiene como consecuencia un aprovechamiento o utilización biológica de los alimentos precarias. Por tanto, es responsabilidad del CETA-Nueva Guinea proveer a los estudiantes de la educación técnica, la aplicabilidad de conocimientos necesarios sobre Seguridad Alimentaria y Nutricional, no como un conocimiento abstracto más, sino como una “Competencia” más dentro de sus habilidades profesionales, que trascienda de su perfil ocupacional hacia agentes de cambios en sus familias y comunidades. Sin embargo, este ideal no es aplicado en el contexto real de los estudiantes y docentes del centro. La seguridad alimentaria no se retoma en los contenidos que sustenta las cargas horarias de los módulos formativos; y los estudiantes lo perciben como temáticas que no forman parte de sus intereses y aspiraciones, aunque si correspondan con sus realidades. Pero la segunda concepción se justifica en la primera, es decir, los estudiantes tienen esta percepción como responsabilidad del proceso de enseñanza que aplican los docentes

Gestión institucional y la inserción laboral en estudiantes de los Centros Técnicos Productivos

El objetivo de la investigación fue Determinar la relación entre la Gestión Institucional y la inserción al mercado laboral de los estudiantes de los Centros Técnicos Productivos, el estudio se realizó con el propósito de análisis el nivel de la gestión institucional y el nivel de inserción laboral de los estudiantes quienes realizan su formación para el trabajo en la institución educativa. Es una investigación básica de nivel descriptivo correlacional, se verificó que los Planes curriculares cuentan con la mayoría de los elementos estructurales, pero que al interior de estos elementos estructurales se nota que no consideran contenidos relacionados con las distintas especialidades técnicas que brinda la institución de acorde al mercado laboral. En la práctica consideran talleres de las disciplinas tecnológicas como son: Gestión y Computación. Como conclusión se manifiesta que existe relación directa y significativa entre la Gestión Institucional y la inserción al mercado laboral de los estudiantes de los Centros Técnico Productivo, dado el nivel de ingreso al mercado laboral siendo necesario articular otras disciplinas tecnológicas.The objective of the research was to determine the relationship between Institutional Management and the insertion into the labor market of the students of the Productive Technical Centers, the study was carried out with the purpose of analyzing the level of institutional management and the level of labor insertion of the students who carry out their training for work in the educational institution. It is a basic investigation of correlational descriptive level, it was verified that curricular plans have the majority of structural elements, but that within these structural elements it is noted that they do not consider contents related to the different technical specialties offered by the institution of agreement to the labor market. In practice they consider workshops of the technological disciplines such as: Management and Computing. In conclusion it is stated that there is a direct and significant relationship between Institutional Management and the insertion into the labor market of the Technical Productive Centers students, given the level of entry into the labor market being necessary to articulate other technological disciplines

A MAC protocol for underwater sensors networks

“The final publication is available at Springer via http://dx.doi.org/10.1007/978-3-319-26401-1_37."Underwater sensor networks are becoming an important field of research, because of its everyday increasing application scope. Examples of their application areas are environmental and pollution monitoring (mainly oil spills), oceanographic data collection, support for submarine geo-localization, ocean sampling and early tsunamis alert. It is well-known the challenge that represents to perform underwater communications provided that radio signals are useless in this medium and a wired solution is too expensive. Therefore, the sensors in these network transmit their information using acoustic signals that propagate well under water. This data transmission type bring an opportunity, but also several challenges to the implementation of these networks, e.g., in terms of energy consumption, data transmission and signal interference. Few proposals are available to deal with the problem in this particular application scenario, and these proposals does not address properly the transmission of underwater acoustic signals. In order to help advance the knowledge in the design and implementation of these networks, this paper proposes a MAC protocol for acoustic communications between the nodes based on a self-organized time division multiple access mechanism. The proposal is still preliminary and it has only been evaluated in the laboratory; however, it represents a highly promising behavior that make us expect interesting results in real-world scenarios.Peer ReviewedPostprint (author's final draft