Search results for "Sources"

Development of bidirectional dc-dc converters for hybrid power sources - Final Report

2018

A Bidirectional Isolated Full-Bridge Converter was designed, prototyped and tested. The device is intended to interface a Bank of Supercapacitors with a battery-powered bus, in order to boost the capability of supplying large power peaks. The converter was based on the Isolated Dual Active Bridge configuration. When driven by an external control voltage, it is capable of generating in both directions a train of current pulses, with 2kW peak power, for any battery voltage in the range 24-32V and for any supercapacitor voltage in the range 35-70V. Worst-case battery current was 70A. Pulse duration was 100ms with 50% duty cycle and 1 ms rise time.

Harmonic sources detection in power systems via nonactive power measurements according to IEEE Std. 1459-2010: theoretical approach and experimental …

2010

In this paper an enhanced decision-making strategy is presented for the detection of harmonic sources in power systems able to detect also which is the prevailing nature of the disturbance (nonlinearity or unbalance). It makes use of some simple indices, which are evaluated by means of the measurements of some nonactive power quantities, proposed by the authors and derived from the approach of the IEEE Std. 1459-2010. The decision-making rules for the proposed strategy are presented and discussed by means of simulation and experimental tests. The results obtained are presented, showing the effectiveness of the proposed strategy for the detection of the dominant harmonic source upstream or d…

Ziņu diskurss un ziņu rakstu mašīntulkošana

2019

Pēdējā desmitgadē mašīntulkošana ir ievērojami attīstījusies un tiek plaši izmantota tulkošanas nozarē, lai izpildītu pieaugošo pieprasījumu pēc ātrākiem tulkojumiem un samazinātu izmaksas. Lai maksimāli palielinātu mašīntulkošanas efektivitāti un iegūtu augstas kvalitātes tulkojumu, mašīntulkošanas darbplūsmā parasti tiek iekļauti divi papildus procesi: rediģēšana pirms un pēc mašīntulkošanas. Pētījuma mērķis ir izpētīt gan latviešu, gan angļu ziņu diskursu, kā arī salīdzināt divu mašīntulkošanas rīku – Google Translate un Tilde Translator – efektivitāti, tulkojot ziņu rakstus no angļu valodas latviešu valodā. Darbā tiek pielietotas teorētiskas un praktiskas pētniecības metodes. Teorētiskā…

The effect of prey resources on evolutionary and ecological dynamics of prey (Serratia marcescens) and predator (Tetrahymena thermophila)

2006

Mathematics Competence Level: The Contribution of Non-symbolic and Spatial Magnitude Comparison Skills.

2019

Magnitude comparison skills have been related to mathematics competence, although results in this area vary. The current study aimed to describe the performance of 75 children (aged 4-5 years) in two comparison tasks; and examine the strength of the relationship between each of the two tasks and mathematics competence level (MCL). Participants were assessed with the Early Numeracy Test which provides a global MCL score. Magnitude comparison skills were assessed with two tasks: a non-symbolic number comparison task and a spatial comparison task. Results of the Pearson correlation analysis showed a relationship between the two tasks with better performance in the spatial comparison task. Regr…

Economic Sustainability of Italian Greenhouse Cherry Tomato

2014

Greenhouse tomato cultivation plays an important role in Sicily, being the primary production area in Italy, due to its favorable pedo-climatic conditions that permit extra-seasonal productions. In Sicily, more than half of greenhouse tomato production is derived from the Province of Ragusa on the southeastern coast, where especially cherry tomato typologies are cultivated. Over the last decade, the Ragusa Province has registered a decrease both in terms of greenhouse tomato area and harvested production due to several structural problems that would require restructuring of the tomato supply chain. Thus, since recognition of real costs and profitability of tomato growing is a vital issue, b…

Perception of the Professional Knowledge of and Education on the Medical Technology Products among the Pharmacists in the Baltic and Nordic Countries…

2016

Article

Wybór między rodziną a pracą zawodową. Doświadczanie i rozwiązywanie konfliktu wewnętrznego

2021

Tło – Współczesnemu człowiekowi coraz trudniej godzić wypełnianie przypisanych ról społecznych, zwłaszcza rolę rodzica i rolę pracownika. Rodzina i praca zawodowa to jedne z najważniejszych wartości, których urzeczywistnianie nadaje życiu sens. Jednakże są sytuacje, w których wartości te znajdują się w konflikcie, gdyż nie można ich realizować równocześnie. Cele – Celem niniejszego artykułu jest rozpoznanie przyczyn konfliktu pomiędzy niniejszymi wartościami, możliwości jego rozwiązywania, jak również omówienie strategii umożliwiających zapobieganie powstawaniu tego rodzaju sytuacji trudnych. Metodyka – Artykuł ma charakter przeglądowy, koncentruje się na opisie i analizie literatury przedm…

Study engagement and burnout profiles among Finnish higher education students

2017

A person-oriented approach was applied to identify profiles of study engagement and burnout (i.e., exhaustion, cynicism, inadequacy) in higher education in a large and representative sample of 12,394 higher education students at different phases of their studies in universities and polytechnics in Finland. Four profiles were identified: Engaged (44%), engaged-exhausted (30%) inefficacious (19%) and burned-out (7%). The engaged students had the most positive engagement accompanied with the least burnout symptoms compared to other groups. The engaged-exhausted students experienced emotional exhaustion simultaneously with academic engagement. The inefficacious group had heightened experience o…

Intercultural Profiles and Adaptation Among Immigrant and Autochthonous Adolescents

2015

Few studies examine relationships between intercultural strategies and adaptation among adolescents using a person-oriented approach. Framed from an intercultural psychology perspective, this study used such an approach in order to examine the influence of intercultural profiles, patterns of relationships among variables related to intercultural strategies, on the adaptation of adolescents of both non-dominant and dominant groups. Two hundred and fifty-six adolescents living in Italy and aged from 14 to 18 participated to the study: 127 immigrants from Tunisia (males = 49.61%) and 129 autochthonous (males = 44.19%). Data were collected through self-report questionnaires. Using cluster analy…