Search results for "source"

El trastorn de dèficit d'atenció amb hiperactivitat (TDAH) en població infantil i juvenil

2012

Fruit de la dedicació professional de les autores i enfront d'un problema no sols no resolt, sinó que es considera que està insuficientment abordat, el trastorn de dèficit d'atenció amb hiperactivitat (TDAH) en població infantil i juvenil, es planteja primerament una revisió de la bibliografia, seguida d'un recull de dades sobre la situació actual (amb abundància d'informació procedent dels Estats Units) i d'algunes consideracions i propostes per a posar en marxa les intervencions al nostre àmbit de referència, com ara l'educació que han de rebre, les concepcions morals, els hàbits, etc. Perquè avui dia els infants estan exposats a nombroses influències que han desencadenat que es disparen …

Geriatric Insights on Elderly Women and Heart Disease

2017

Purpose of Review: The prevalence of heart diseases is growing in recent years and will further rise because of the increased longevity of elderly population, mainly reported for the female gender. Recent Findings: Several studies have demonstrated the presence of a large sex-specific variability on physiopathology, presentation, and overall prognosis of cardiovascular diseases (CVD). Women, in particular, tend to present heart diseases generally later than men, have a higher number of comorbidities, and report worse outcomes. Moreover, atypical symptomatology of heart diseases in older women constitutes a potential source of delay in the identification of such pathologies, influencing the …

ELECTRE TRI to classify items with respect to maintainability criterion

2014

The paper aims to suggest a methodology able to support the analyst in the assessment process of items on the base of a criterion inspired to the maintainability parameter and in the successive assignment phase of the items in the predefined classes. The maintainability involves the continuous improvement of a system in order to improve the ability to maintain or improve the reliability of the analyzed system. In particular, the last one is the probability that a failed system will be restored to specified conditions within a given period of time when maintenance is performed according to prescribed procedures and resources. The faced case in this research regards the software maintenance, …

PV Reconfiguration Systems: a Technical and Economic Study

2017

Dynamical electrical array reconfiguration strategies for grid-connected PV systems have been proposed as solution to improve energy production due to the mismatch effect of PV plants during partial shading conditions. Strategies are based on the use of dynamic connections between PV panels given by the employment of switches that allow for each panel the series, parallel or exclusion connections, physically changing the electrical connections between the related PV modules, consequentially modifying the layout of the plant. Usually the cost of the dynamic matrix is not taken into account. This novel work evaluates the economic advantages obtained by the use of reconfiguration strategies in…

Optimization of a Sea Wave Energy Harvesting Electromagnetic Device

2008

This paper presents the optimization of a permanent magnet linear generator directly coupled to sea waves. In order to maximize energy extraction, the stochastic features of the energy source is included in the mathematical model of the system in order to satisfactorily tackle the problem. An optimization procedure which includes the stochastic features of the model is presented and a machine built on the basis of the results of this procedure is shown.

Machine-learned models for the performance of six different solar PV technologies under the tropical environment

2020

Due to the recent environmental concerns and long-term challenges in energy security, the Global energy scenarios are shifting more towards sustainable and renewable energy resources. Brunei has planned to increase the use of cleaner energy technologies by contributing 10 percent or 954 GWh of renewable energy in its power generation mix by 2035. Out of the available renewable options, solar is the most promising one for Brunei, for example, the daily average solar installation is around 5kWh per day [1]. Though solar energy is an abundant resource, for optimally designing and successfully managing solar power projects, its availability in different time scales are to be analyzed and unders…

5th EOS Topical Meeting on Optical Microsystems, Poster OμS13_1569798553: Analytical Model for wideband THz sources and detectors based on Optical Re…

2013

Analytical Model for wideband THz sources and detectors based on Optical Rectification and Electro-Optic Sampling

2013

An analytical model describing a laser based set-up for wideband THz generation and detection is presented. Particular attention is focused on the main broadband phenomena, which occur when THz radiations have to be handled.

Highly selective generation of vanillin by anodic degradation of lignin: a combined approach of electrochemistry and product isolation by adsorption

2015

The oxidative degradation of lignin into a variety of valuable products has been under investigation since the first half of the last century. Especially, the chance to claim this cheap, abundant and renewable source for the production of the important aroma chemical vanillin (1) was one of the major driving forces of lignin research. So far most of the developed methods fail in technical application since no viable concept for work-up is included. This work represents a combined approach of electrochemical conversion of Kraft lignin and product recovery by adsorption on a strongly basic anion exchange resin. Electrolysis conditions are optimized regarding reaction temperatures below 100 °C…

Studies of plasma breakdown and electron heating on a 14 GHz ECR ion source through measurement of plasma bremsstrahlung

2011

Temporal evolution of plasma bremsstrahlung emitted by a 14?GHz electron cyclotron resonance ion source (ECRIS) operated in pulsed mode is presented in the energy range 1.5?400?keV with 100??s resolution. Such a high temporal resolution together with this energy range has never been measured before with an ECRIS. Data are presented as a function of microwave power, neutral gas pressure, magnetic field configuration and seed electron density. The saturation time of the bremsstrahlung count rate is almost independent of the photon energy up to 100?keV and exhibits similar characteristics with the neutral gas balance. The average photon energy during the plasma breakdown is significantly highe…