Harley Dean Oberhelman, Ernesto Sábato. Twayne, New York, 1970; 16 pp. (TWAS 123).

Se reseñó el libro: Ernesto Sábato.

Energy efficient wireless sensor network communications based on computational intelligent data fusion for environmental monitoring

The study presents a novel computational intelligence algorithm designed to optimise energy consumption in an environmental monitoring process: specifically, water level measurements in flooded areas. This algorithm aims to obtain a tradeoff between accuracy and power consumption. The implementation constitutes a data aggregation and fusion in itself. A harsh environment can make the direct measurement of flood levels a difficult task. This study proposes a flood level estimation, inferred through the measurement of other common environmental variables. The benefit of this algorithm is tested both with simulations and real experiments conducted in Donñana, a national park in southern Spain where flood level measurements have traditionally been done manually.Junta de Andalucía P07-TIC-0247

Indoor Localization of the Points of Interest using RO-SLAM

This paper describes an indoor localization system based on RO-SLAM technique, which has been led to experimentation. The proposed system has been considered to have low power consumption. The nodes of the network are based on the well-known architecture TelosB. A distance estimation study has been developed in order to determine the relationship between radio power signal strength in a radio link and distance between nodes. This relationship has a high variability and given its importance for successful tracking, much of this work has been devoted to its study. This system could be applied as a usefull solution for localization in a warehouse, where GPS-based system does not work. Based on the results obtained, this system is deemed as feasible because the motes have been localized with an acceptable error (1.2 m) under real conditions

Application of communication technologies (ICT) within the tourism industry in the European Union

The information and communication technologies (ICT) are revolutionizing the tourism industry. This research note will make a brief diagnosis of the relationships between tourism and ICT in the European context by presenting an index to characterize the digitization of the tourism sector and its comparison with a reference index, which reflects the introduction of the ICT in every country. The proposed indicator will allow us to know the degree of integration of these ICT in EU countries when talking about tourism accommodation reservations. The results indicate divergent behavior patterns in digital accommodation management and in how ICTs are managed, as well as a different perception of trends between different geographical areas of the European Union. From the comparative analysis of the indicators, we can observe that in the South of Europe/Mediterranean area both the tourism integration and ICT are quite commonly below the European results. In other countries like Holland and Spain, the traditional channels are still used despite of their outstanding digitalization. These patterns provide relevant insights for the companies, especially for the tourism agencies, and allow establishing sector needs within the digital field

Determination of the glass-forming concentration range in binary alloys from a semiempirical theory: Application to Zr-based alloys

Producción CientíficaA semiempirical theory is presented to calculate free-energy diagrams of glass-forming alloys. The theory is based on the enthalpy of formation of the solid solution expressed as a sum of two contributions: (a) a chemical contribution due to electronic redistribution in forming the alloy, and (b) an elastic contribution arising from the difference in size between solute and solvent atoms. The enthalpy of formation of the amorphous phase has only the chemical contribution. The theory is used to successfully describe the glass-forming concentration range of some Zr-based alloys, which have been experimentally analyzed by several distinct techniques

Development of a prototype for submarine communications in shallow waters

The Telecommunications Marine Laboratory (TML) of the University of Cádiz takes part in a research project to study the intertidal sediments of the Bay of Cádiz. The collection of samples from the seabed and the transmission of data to the surface are performed by a Mini Profiler with four channels (MP4), which is supplied by UNISENSE. Each channel processes the samples collected by a single sensor. For power, control, and data transmission, a special wiring that connects the submerged subsystem with the surface subsystem is used. The tension transmitted by the cable to the MP4 structure makes its handling and positioning under water more difficult. This article explains the technological solution developed by the TML to replace some wiring from the MP4. For the prototype, two underwater acoustic modems have been used and an electronic system has been developed based on the Arduino platform, in order to multiplex, digitize, and transmit the data collected by the MP4 sensors, eliminating the need to use wiring. The submerged subsystem has an autonomous power supply by a battery.Peer Reviewe

Simulación de un sistema eléctrico RC con una fuente de voltaje variable

In this research work, the solution of a fundamental application problem in the theory of electrical systems is presented, such as the RC circuit, which contains an electrical resistance, a capacitor and a time-dependent voltage source, its solution contemplates the application of its physical and mathematical foundations, in order to carry out a qualitative and quantitative study that allows obtaining, solving and modeling in Simulink the differential execution and that governs the system.In this research work, the solution of a fundamental application problem in the theory of electrical systems is presented, such as the RC circuit, which contains an electrical resistance, a capacitor and a time-dependent voltage source, its solution contemplates the application of its physical and mathematical foundations, in order to carry out a qualitative and quantitative study that allows obtaining, solving and modeling in Simulink the differential execution and that governs the system

The Comparison Study of Short-Term Prediction Methods to Enhance the Model Predictive Controller Applied to Microgrid Energy Management

Electricity load forecasting, optimal power system operation and energy management play key roles that can bring significant operational advantages to microgrids. This paper studies how methods based on time series and neural networks can be used to predict energy demand and production, allowing them to be combined with model predictive control. Comparisons of different prediction methods and different optimum energy distribution scenarios are provided, permitting us to determine when short-term energy prediction models should be used. The proposed prediction models in addition to the model predictive control strategy appear as a promising solution to energy management in microgrids. The controller has the task of performing the management of electricity purchase and sale to the power grid, maximizing the use of renewable energy sources and managing the use of the energy storage system. Simulations were performed with different weather conditions of solar irradiation. The obtained results are encouraging for future practical implementation