Search results for "source"
showing 10 items of 6139 documents
Robust Transmission for Reconfigurable Intelligent Surface Aided Millimeter Wave Vehicular Communications With Statistical CSI
2022
The integration of reconfigurable intelligent surface (RIS) into millimeter wave (mmWave) vehicular communications offers the possibility to unleash the potential of future proliferating vehicular applications. However, the high-mobility-induced rapidly varying channel state information (CSI) has been making it challenging to obtain the accurate instantaneous CSI (I-CSI) and to cope with the incurable high signaling overhead. The situation may become worse when the RIS with a large number of passive reflecting elements is deployed. To overcome this challenge, we investigate in this paper a robust transmission scheme for the time-varying RIS-aided mmWave vehicular communications, in which, s…
TEACHING TO USE IN SCIENCE AND MATHEMATICS PREVIOUSLY ACQUIRED SKILLS
2016
Goal of the research is to analyse how students currently succeed in using basic skills acquired in mathematics, in science and real-life contexts, before new reforms in Latvia for the development of students' competence have been started. Only about 20% of students in the national testing for 9th grade were able to do it. The research analysed students’ papers, results, and study aids, as well as teacher performance in lessons.
El huerto escolar como herramienta innovadora que contribuye al desarrollo competencial del estudiante universitario. Una propuesta educativa multidi…
2017
El huerto escolar es un recurso pedagógico que permite aproximar al alumnado al entorno natural diseñando experiencias interdisciplinares que contribuyan al desarrollo de las competencias básicas. En el ámbito universitario facilita el aprendizaje cooperativo y la adquisición de habilidades socioambientales. El proyecto L’Hort 2.0 pretende crear un entorno virtual basado en el huerto escolar para la administración de contenidos TIC que permitan enlazar las actividades fuera del aula con el contenido de las guías docentes. Se trabaja mediante una metodología activa y colaborativa, en tres fases: preparación y diseño del entorno web en seis áreas temáticas; elaboración de materiales educativo…
Diseño y validación de la bater´ía de competencia literaria (BCL) Design and validation of the literary competence battery (LBC)
2019
El objetivo de este trabajo es presentar el proceso de diseño y validación de la Batería de Competencia Literaria (BCL). La Batería está formada por tres escalas: Escala de Conceptos Literarios (ECL), Escala de Procedimientos Literarios (EPL) y Escala de Actitudes hacia la literatura (EAL). La adquisición de la Competencia Literaria (CL) es el principal objetivo de la llamada Educación Literaria. Sin embargo, existen pocos métodos para medir esta competencia y la mayoría presentan problemas prácticos que limitan su estandarización. Un total de 221 adolescentes participaron en el proceso de diseño y validación. Se llevaron a cabo estudios sobre las propiedades de las pruebas incluyendo medid…
On-board Energy Consumption Assessment for Symbolic Execution Models on Embedded Devices
2020
Internet of Things (IoT) applications operate in several domains while requiring seamless integration among heterogeneous objects. Regardless of the specific platform and context, IoT applications demand high energy efficiency. Adopting resource-constrained embedded devices for IoT applications means ensuring low power consumption, low maintenance costs and possibly longer battery life. Meeting these requirements is particularly arduous as programmers are not able to monitor the energy consumption of their own software during development or when applications are finally deployed. In this paper, we discuss on-board real-time energy evaluation of both hardware and software during the developm…
A heuristic approach for optimal operation of grid connected source-battery-load systems
2016
In the paper an optimal management procedure for a system composed of a renewable energy source, storage batteries and a load, permanently connected to a distribution network, is presented. The issue follows two objectives: a) maximum economic benefit for the system, and b) minimum energy exchange with the network. The operation cost of storage facilities, as well as the technical and economic constraints on power exchanges between the system and the network and the technical constraints about charging and discharging cycles of the batteries are considered. The effectiveness of the management procedure is numerically tested and the results are presented.
Techno-economic evaluation of PV based institutional smart micro-grid under energy pricing dynamics
2020
Abstract The solar photovoltaic (PV) system with battery energy storage have a lot of potential to provide reliable and cost-effective electricity and to contribute in micro-grid operation. However, the operational performance of such type of micro-grid system depends on many factors (e.g. techno-economic sizing, energy management among the sources, market energy prices dynamics, energy dispatch strategies, etc.). In this paper, a typical Indian institutional energy system has considered for techno-economic performance evaluation for operating as a smart micro-grid under market energy pricing dynamics. The institutional energy system has integrated PV, battery storage and DG for operating a…
Decentralized on-site optimization of a battery storage system using one-way communication
2015
Intermittent renewable energy sources (e.g. wind, solar energy systems) have been providing an exponentially growing share of electricity generation. Due to their highly transient and stochastic nature, they pose substantial challenges for power grid operation. Power dispatched from these sources are uncontrolled and do not necessarily coincide with demand; this in turn affects power quality. Hence, extensive demand side management (DSM) is required. DSM relies on flexible loads as well as energy storage facilities. Furthermore, renewable power generation is by its very nature highly distributed and consists of large numbers of small units. These have a substantial effect on traditional pow…
An integrated energy simulation and life cycle assessment to measure the operational and embodied energy of a Mediterranean net zero energy building
2022
Abstract Net Zero Energy Buildings can play a key role in reducing the energy use, greenhouse gas emissions and the use of natural resources associated to the built environment. It is widely recognized that in low energy building a shift in relevance may occur from the operational to the embodied impacts. However, building performance assessment focus mostly on the operational phase and on primary energy consumption. This study aims to assess the energy and environmental impacts of a residential net zero energy building expanding the analysis to the full life cycle and to a wide range of environmental impact categories. The methodological approach integrates a non-steady state building ener…
Power Grid Integration and Use-Case Study of Acid-Base Flow Battery Technology
2021
There are many different types of energy storage systems (ESS) available and the functionality that they can provide is extensive. However, each of these solutions come with their own set of drawbacks. The acid-base flow battery (ABFB) technology aims to provide a route to a cheap, clean and safe ESS by means of providing a new kind of energy storage technology based on reversible dissociation of water via bipolar electrodialysis. First, the main characteristics of the ABFB technology are described briefly to highlight its main advantages and drawbacks and define the most-competitive use-case scenarios in which the technology could be applied, as well as analyze the particular characteristi…