Search results for "VSI"
showing 8 items of 8 documents
Semiquantitative evaluation of lymph-vascular space invasion in patients affected by endometrial cancer: Prognostic and clinical implications.
2020
Objectives: The interpretation of lymph-vascular space invasion (LVSI) is usually qualitative, as presence or absence. The aim of this study is to investigate the prognostic role of LVSI in patients affected by endometrial cancer, when evaluated with a semiquantitative analysis. Methods: This retrospective multicentre study enrolled patients who received a histologically confirmed diagnosis of endometrial cancer. The assessment of LVSI was semiquantitative in accordance with the three-tiered scoring system (absent, focal and diffuse). Results: Among 1258 patients with surgical-stage endometrial cancer, LVSI has been found in 32.8% of cases (n = 412), whose 12.7% (n = 160) were focal, and 20…
An Adaptive Robust Predictive Current Control for Three-Phase Grid-Connected Inverters
2011
This paper presents an adaptive robust predictive current control (RPCC) for grid-connected three-phase inverters that exhibit zero steady-state current error. The error correction is achieved by means of an adaptive strategy that works in parallel with the deadbeat algorithm, therefore preserving the typical fast response of the predictive law. The resulting control adapts to any particular L or LCL filter by estimation of the resistive part of the filter. As a variety of the RPCC class of control, it offers the best tradeoff between robustness and speed. © 2009 IEEE.
Generalized PWM-VSI Control Algorithm Based on a Universal Duty-Cycle Expression: Theoretical Analysis, Simulation Results, and Experimental Validati…
2007
This paper presents a new approach in realizing various carrier-based pulsewidth-modulation techniques by a generalized control algorithm, which is referred to as the universal control algorithm and is obtained via unequal sharing of null states. The flexibility of such an approach allows one to easily and quickly control two-level inverters. Furthermore, this approach may be also extended with few changes to the control of multilevel inverters. The algorithm that is presented here for two-level voltage-source inverters (VSIs) also obtains efficient detection and management of both the linear and overmodulation ranges. In the overmodulation range, which is treated by using the alpha-beta co…
Practical Implementation of a Synchronous PWM Strategy for Low Switching Frequency FOC of im Drives with ATSAM3X8E Microcontroller
2021
This paper presents a practical implementation of synchronous PWM modulation algorithm for an induction motor field oriented control powered by a DC/AC inverter and implemented on a low-cost microcontroller, the ATSAM3X8E. In particular, a simple algorithm, capable to calculate automatically an optimized set of frequency modulation indexes will be presented. Hysteresis bands are also introduced in the algorithm in order to avoid multiple changeovers during modulation index transitions. Experimental tests and their results will be shown and discussed, highlighting the benefits of the present algorithm, such as reduction of current harmonic content, reduction of current ripple and, consequent…
Zvaigžņotā Debess: 2008, Vasara
2008
Latvijas Zinātņu akadēmija, Latvijas Universitāte
Arqueometría y georreferenciación con gvSIG en un yacimiento al aire libre. Campaña Mas d’is 2015
2016
La Arqueología ha sido pionera entre las Humanidades en la utilización de los avances tecnológicos para acercarse al conocimiento histórico, lo que ha facilitado y mejorado el trabajo posterior de los datos registrados. Con programas como gvSIG, se pueden realizar estos estudios y georreferenciar unidades estratigráficas (UUEE), configurar la forma de estructuras o ubicar en el espacio las piezas arqueológicas encontradas, dotando de un significado más completo al trabajo de campo. En esta comunicación, aportamos nuestra experiencia para el tratamiento de datos del yacimiento neolítico de Mas d’Is (Penàguila, Alicante). La campaña de 2015 se abordó desde su inicio con el ánimo de informatiz…
Reconstrucció del paisatge rural i urbà d'Almenara i La Llosa entre els segle XIII al XVI
2023
La tesi titulada «Reconstrucció del paisatge rural i urbà d'Almenara i La Llosa entre els segles XIII-XVI», aprofundeix en l'evolució del paisatge cultural d'ambdós municipis i l'estudi de la seua població. Amb la finalitat de valorar els béns culturals municipals d'aquest període i destacar-ne la rellevància i les funcions en el passat. Cosa que possibilita una millor acceptació en el manteniment i en el respecte d'aquests béns en la societat actual. El paisatge constitueix una realitat dinàmica, ja que és resultat de processos ambientals, socials i culturals que s'han succeït al llarg del temps en el territori. Aquests processos estan marcats per les maneres de vida, les polítiques, les a…
Decoupled control scheme of grid-connected split-source inverters
2017
Grid-connected power conversion systems for renewable energy sources must fulfill several requirements, e.g., the high efficiency, the reduced cost and complexity, and, quite often, the boost capabilities that is usually achieved using a front-end dc–dc boost converter before the inversion stage, leading to a two-stage architecture. Meanwhile, single-stage power conversion systems, which perform the boosting operation within the inversion one, offer some potential advantages, in terms of reducing the complexity and the volume of the whole system. Among several proposed options, the split-source inverter (SSI) has been recently proposed by Abdelhakim et al. as an alternative option with some…