Search results for "dynamics."
showing 10 items of 9637 documents
Transient stability simulation of a fixed speed wind turbine by Matlab/Simulink
2007
This paper describes the dynamic behavior of a typical fixed speed wind turbine connected to the grid; the model is developed in the simulation tool Matlab/Simulink and created as a modular structure. The pitch control system is used for stabilization of the wind turbine at grid faults. In this way, voltage stability of the system with grid-connected wind turbines can be improved by using blade-angle control for a temporary reduction of the wind turbine power during a short-circuit fault in the grid. This paper shows a new variable control for maintaining of voltage stability, when a three-phase fault is applied close to the wind turbine and cleared by disconnecting the affected line. In th…
Information Dynamics of Electric Field Intensity before and during the COVID-19 Pandemic.
2022
This work investigates the temporal statistical structure of time series of electric field (EF) intensity recorded with the aim of exploring the dynamical patterns associated with periods with different human activity in urban areas. The analyzed time series were obtained from a sensor of the EMF RATEL monitoring system installed in the campus area of the University of Novi Sad, Serbia. The sensor performs wideband cumulative EF intensity monitoring of all active commercial EF sources, thus including those linked to human utilization of wireless communication systems. Monitoring was performed continuously during the years 2019 and 2020, allowing us to investigate the effects on the patterns…
Dynamics and extraction of quantum discord in a multipartite open system
2011
We consider a multipartite system consisting of two noninteracting qubits each embedded in a single-mode leaky cavity, in turn connected to an external bosonic reservoir. Initially, we take the two qubits in an entangled state while the cavities and the reservoirs have zero photons. We investigate, in this six-partite quantum system, the transfer of quantum discord from the qubits to the cavities and reservoirs. We show that this transfer occurs also when the cavities are not entangled. Moreover, we discuss how quantum discord can be extracted from the cavities and transferred to distant systems by traveling leaking photons, using the input-output theory.
FAVARA FUTURES. Research workshop, Start conference. Dynamics of periphery
2017
The book collects a result of the project between the University of Palermo and Leibniz Universität Hannover, “Dynamics of Periphery” funded in the University Dialogue Programme Southern Europe of DAAD. The conceptual approaches collected in the book are combined with a project report of a workshop in Favara with master students of both universities; in collaboration with the municipality of Favara and with FARM Cultural Park Favara. The trans-versal research between architecture, urban design, arts, local and regional development highlights the need and the potential of new ways to integrate “Dynamics of Periphery” in debates and policies about futures of habitat in Europe.
Analysis of disturbances in soil carbon storage and dynamics.
2011
The determinants and barriers of e-Government Adoption in the Municipality of Palermo
2014
La costante innovazione tecnologica fornisce nuovi spunti per la creazione di network efficienti e lo sviluppo di nuovi business. Anche la Pubblica Amministrazione (PA) vuole sfruttare tali opportunità. In particolare, la PA, attraverso l’implementazione di una strategia di e-Government può mirare a una maggiore efficienza, alla riduzione dell’errore umano e delle frodi. Tuttavia, non si tratta di un mero cambiamento di strumenti. Il passaggio a un’Amministrazione Digitale richiede un cambio di approccio manageriale. Partendo dalla somministrazione di un questionario (sul sito istituzionale del Comune di Palermo, 389 risposte utili) che ha confermato la poca consapevolezza dei cittadini rig…
Exploring the Life Form of a Student Athlete Afforded by a Dual Career Development Environment in Finland
2020
The current paper introduces a case study conducted in one of the most well-established athletic talent development environments in Finland, with the focus on the environment’s ecological dynamics and organizational culture, in light of its recent effort to rebrand itself as a dual career development environment. Our analysis has been inspired by the holistic ecological approach and ecological dynamics, wherein the authors have considered a dual career development environment from the point of view of its transactions with agentic individuals and affordances for student athletes in the study domain, the sports domain, and the private domain. The authors believe our findings can provide othe…
Dynamic Sustainability Assessment Tool: Case Study of Green Biorefineries in Danish Agriculture
2020
In this work, a novel, dynamic sustainability assessment tool is presented and validated in a case study. This tool combines two methods&mdash
Evolutionary genomics can improve prediction of species' responses to climate change
2020
Abstract Global climate change (GCC) increasingly threatens biodiversity through the loss of species, and the transformation of entire ecosystems. Many species are challenged by the pace of GCC because they might not be able to respond fast enough to changing biotic and abiotic conditions. Species can respond either by shifting their range, or by persisting in their local habitat. If populations persist, they can tolerate climatic changes through phenotypic plasticity, or genetically adapt to changing conditions depending on their genetic variability and census population size to allow for de novo mutations. Otherwise, populations will experience demographic collapses and species may go ext…
Developmental Dynamics of Math Performance From Preschool to Grade 2.
2004
This study investigated the developmental dynamics of mathematical performance during children's transition from preschool to Grade 2 and the cognitive antecedents of this development. 194 Finnish children were examined 6 times according to their math performance, twice during each year across a 3-year period. Cognitive antecedents, that is, counting ability, visual attention, metacognitive knowledge, and listening comprehension, were tested at the first measurement point. The results indicated that math performance showed high stability and increasing variance over time. Moreover, the growth of math competence was faster among those who entered preschool with an already high level of mathe…