Search results for "Tort"
showing 10 items of 734 documents
Comparison of two different approaches for harmonic distortion sources assessment
2021
The paper focuses the attention on the comparison of two approaches for power quality assessment in the electric grid. Both approaches are suitable for investigating the harmonic pollution source and discovering if the harmonic source comes from the customer or the utility grid. The two approaches have the same purpose but they are deeply different. The first approach is based on the knowledge of the customer and utility equivalent impedance while the second is based on single point measurement at point of common coupling PCC. In this paper, the advantages and drawbacks of the two approaches are investigated also supported by a case study.
Experimental Comparative Analysis of Efficiency and THD for a Three-phase Five-level Cascaded H-Bridge Inverter Controlled by Several MC-PWM Schemes
2021
Cascaded H-Bridges Multilevel Inverters are an innovative and promising solution in different application fields. This topology allows obtaining an improvement in the performance (e.g. reduced harmonic content, the low voltage stress on power components, and high efficiency) in respect to the traditional two-level inverters. In this context, the Multicarrier-PWM strategies play an important role thanks to their features. This paper presents an experimental investigation on the performance of a three-phase five-level Cascaded H-Bridge inverter by using different PWM modulation strategies. In particular, the paper is focused on the experimental validation of the main features of Multicarrier …
Improved Switching Strategy for Selective Harmonic Elimination in DC-AC Signal Generation via Pulse-Width Modulation
2013
Published version of an article in the journal: Abstract and Applied Analysis. Also available from the publisher at: http://dx.doi.org/10.1155/2013/870904 Open Access We present an advanced design methodology for pulse-width-modulated (PWM) DC-AC signal generation. Using design methods based on the Walsh transform, AC sinusoidal signals can be approximated by suitable PWM signals. For different AC amplitudes, the switching instants of the PWM signals can be efficiently computed by using appropriate systems of explicit linear equations. However, the equation systems provided by conventional implementations of this approach are typically only valid for a restricted interval of AC amplitudes a…
Power Conversion System for Improved Linear Generator in sea wave energy harvesting applications
2020
Nowadays, many islands worldwide are lack of electrical energy. Thus, it is convenient to exploit available renewable energy sources, among which sea waves near the islands. This paper focuses on the power conversion system coupled with an offshore wave energy device, such as an improved linear generator, to be used for sea wave energy harvesting. Particularly, the design of the linear generator has been proposed to improve the energy efficiency of the entire system. The proposed power conversion system is composed by two Boost Rectifier (BR) directly coupled to the linear generator, and one Voltage Source Inverter (VSI), which it is used as front-end between the DC-bus and the grid. The pr…
Mixed Harmonic Elimination Control for a Single-Phase 9 Level Grid-Connected Inverter
2018
The power quality requirements are increasingly stringent, due to the continuous growth of devices connected to the grid that introduce harmonics. These devices include DC to AC energy conversion systems, i.e. grid connected inverters. The design, control and operation of these systems must take into account the rules of interconnection to the electricity grid. To improve the quality of the output waveform of the grid-connected inverter, Multilevel Converters (MC) with selective harmonic elimination modulation technique can be used. This paper presents a single-phase nine level grid-connected inverter with DC/DC input stages. The obtained switching angles for THD minimization are independen…
Domēnspecifisku rīku konfigurācijas valoda un tās realizācija
2014
Promocijas darbā ir izstrādāts konfigurators plaša profila DSML rīku definēšanai. Konfigurators balstās uz ideju, ka DSML definīciju var uzdot ar universālu metamodeli (UML klašu diagrammas formā), kura pēc tam konfiguratorā tiek apstrādāta, lai nodrošinātu rīka darbību. Turklāt nestandarta gadījumiem, kad esošās metamodeļa iespējas ir nepietiekošas, metamodelī ir realizēts paplašinājuma punktu mehānisms, kas ļauj pievienot rīkam specifiski transformāciju valodā noprogrammētu funkcionalitāti. Izstrādātais konfigurators ir pārbaudīts vairākos praktiskos lietojumos un apliecinājis savu efektivitāti.
El cos de la dona maltractada, sota l’escrutini mèdic: els casos de València i Lleida en la baixa edat mitjana
2020
Resum: A partir dels rics fons en matèria judicial que es conserven als arxius de les ciutats de València i Lleida, hem desenvolupat una recerca sobre la intervenció dels practicants de la medicina com a guaridors i com a experts cridats en els tribunals per determinar la naturalesa i la gravetat de les lesions causades per diferents formes de violència exercida contra la dona: violació, maltractament domèstic, tortura, agressions comunes. Fem una aproximació a la legislació, i la contrastem amb la documentació, particularment els testimonis d’individus cridats als judicis. A més, analitzem el paper de l’expert, com és utilitzat pel jutge, les limitacions de la seua aportació i les controvè…
El artículo 4 de la Carta de los Derechos Fundamentales de la Unión Europea sobre la prohibición de la tortura y de las penas o los tratos inhumanos …
2022
En esta publicación, os comento el artículo 4 de la Carta de los Derechos Fundamentales de la Unión Europea sobre la prohibición de la tortura y de las penas o los tratos inhumanos o degradantes In this publication, I comment you on article 4 of the Charter of Fundamental Rights of the European Union on the prohibition of torture and inhuman or degrading treatment or punishment
The Loss of Confidence in the World
2018
In this chapter, I focus on the experience of torture and, more specifically, on Jean Améry's account of it in his book *At the Mind's Limits*. There he claims that the loss of confidence in the world is the most devastating effect he experienced as a victim of torture. I thus explore what cosmopolitan aspiration may be revealed by this loss and also discuss whether it is to be discredited as an irrational reaction on the victim's side or instead as proportional to the facts and, consequently, as relevant to the conditions under which a certain cosmopolitan aspiration could be achieved or, at least, favored.
Correction of B-scan distortion for optimum ultrasonic imaging of backwalls with complex geometries
2020
Ultrasound undergoes refraction and reflection at interfaces between media of different acoustic refractive indices. The most common ultrasonic method (pulse-echo) monitors the reflected energy to infer the presence of flaws, whereas the lower amplitude of refracted signals is ignored. When the reflector is orientated normally with respect to the ultrasonic beam, the received echo signal shows the maximum amplitude. The pulse-echo method also relies on monitoring the amplitude of the backwall echo to identify or confirm the presence of defects. This works well for parts with constant thickness and with planar backwalls. Unfortunately, parts with complex backwalls are common to many industri…