Search results for "Power"

DEVIATORE DI FLUSSO PER TURBINE IDRAULICHE IN LINEA

2021

Un deviatore di flusso per una turbina idraulica a flusso incrociato presenta una sezione di uscita atta ad essere collegata alla sezione a valle della condotta idraulica per l’immissione di un flusso in uscita del fluido liquido in pressione con un vettore di velocità di uscita avente modulo di uscita (Vo) e direzione di uscita (do) predeterminati, un condotto di scarico per il ripristino del vettore velocità di detto flusso in uscita al modulo in ingresso ed a una direzione di uscita sostanzialmente parallela o coincidente con detta direzione di ingresso (di), in cui detto deviatore comprende, un primo settore immediatamente a valle di detta girante ed atto a variare la direzione del flus…

A New Cross-Flow Type Turbine for Ultra-Low Head in Streams and Channels

2023

In the last few decades, hydropower production has been moving toward a new paradigm of low and diffused power density production of energy with small and mini-hydro plants, which usually do not require significant water storage. In the case of nominal power lower than 20 kW and ultra-low head H (H < 5 m), Archimedes screw or Kaplan type turbines are usually chosen due to their efficiency, which is higher than 0.85. A new cross-flow type turbine called Ultra-low Power Recovery System (UL-PRS) is proposed and its geometry and design criteria are validated in a wide range of operating conditions through 2D numerical analysis computed using the ANSYS Fluent solver. The new proposed solution…

Anomalous performance enhancement effects in Ruthenium-based Dye Sensitized Solar Cells

2017

Dye Sensitized Solar Cells (DSSCs) are nowadays more and more employed since they present lower production costs than traditional silicon photovoltaic devices. An interesting phenomenon affecting such devices consists in the fact that current density-voltage (J-V) characteristic can depend on the history of the cell prior to the measurement, which often can be assimilated to an anomalous hysteresis effect. In this work, we study such phenomenon on Ruthenium-based DSSCs through a series of measurements performed after applying different values of external electrical field to the cell. The measurements have been carried out both under simulated sunlight (AM1.5G - 1000 W/m2) and in the dark. W…

Itseen liittyvien voimavarojen ja ikääntymisen rooli työttömyyden ja subjektiivisen terveyden välisessä yhteydessä

2004

A scoping review exploration of the intended and unintended consequences of eHeath on older people : a health equity impact assessment

2018

eHealth is one perceived mechanism to extend the range and reach of limited health-care resources for older adults. A decade-scoping review (2007–2017) was conducted to systematically search and synthesize evidence to understand the intended and unintended consequences of eHealth initiatives, informed by a health equity impact assessment framework. Scoping review sources included international academic and grey literature on eHealth initiatives (e.g., eHealth records, telemedicine/telecare, and mobile eHealth application) focused on the varying needs of older adults (aged 60+), particularly individuals experiencing sociocultural and economic difficulties. Findings suggest that eHealth has s…

In Situ Synthesis of Polythiophene and Silver Nanoparticles within a PMMA Matrix: A Nanocomposite Approach to Thermoelectrics

2022

The processability of organic thermoelectric materials plays a crucial role due to their clear advantages of applicability in large-scale areas compared to traditional inorganic counterparts. A promising way to process thermoelectric materials based on conductive polymers is through in situ polymerization in an insulating polymer matrix. This work shows an interpenetrating polymeric network based on polythiophene, silver nanoparticles (Ag NPs), and poly(methyl methacrylate) (PMMA) produced by the oxidative polymerization of terthiophene by an oxidizing silver salt in a PMMA matrix. Ag NPs are in situ synthesized simultaneously as a byproduct. The reaction occurs very fast in the solid state…

The Analysis of the Digital Economy and Society Index in the EU

2019

Abstract The paper analyzes the Digital Economy and Society Index (DESI), which characterizes the development of digital economy. Based on the data of 28 European countries for 2013–2018, using the panel regression, we studied the influence of the consumption index growth by the purchasing power parity and unemployment among the active population on the structural units of DESI. It is shown that a 1% increase in the consumption index results in about 0.2 increase in the DESI, and an increase in unemployment by 1% leads to about 0.2 DESI decline. It is also shown that the 98% value of DESI is actually determined by its previous trends, and therefore it is impossible to increase this index ra…

PCB-Based Planar Inductive Loops for Partial Discharges Detection in Power Cables

2022

Partial discharge (PD) diagnosis tests, including detecting, locating, and identifying, are used to trace defects or faults and assess the degree of aging in order to monitor the insulation condition of medium- and high-voltage power cables. In this context, an experimental evaluation of three different printed circuit board (PCB)-based inductive sensor topologies, with spiral, non-spiral, and meander shapes, is performed. The aim is to assess their capabilities for PD detection along a transmission power cable. First, simulation and experimental characterization are carried out to determine the equivalent electrical circuit and the quality factor of the three sensors. PD activity was studi…

Change detection to tone pairs during the first year of life : Predictive longitudinal relationships for EEG-based source and time-frequency measures

2019

Brain responses related to auditory processing show large changes throughout infancy and childhood with some evidence that the two hemispheres might mature at different rates. Differing rates of hemispheric maturation could be linked to the proposed functional specialization of the hemispheres in which the left auditory cortex engages in analysis of precise timing information whereas the right auditory cortex focuses on analysis of sound frequency. Here the auditory change detection process for rapidly presented tone-pairs was examined in a longitudinal sample of infants at the age of 6 and 12 months using EEG. The ERP response related to change detection of a frequency contrast, its estima…

The Role of Information in Art Museum Communication Process

2013

Abstract The way that nowadays world is constantly changing influences both individuals and organizations. They have to act in an innovative, fast environment, pursuing their goals. The amount of information increases and it becomes difficult to filtrate and transform it. This is a conceptual paper, which aims at analysing art museums in nowadays society from a communication perspective. It starts out by describing how the museum institution managed to adapt during time and the way it modified under the action of innovation. It describes the needs and functions that such an institution has in society and corroborates them with the information sending process, offering scenario in which an e…