Search results for "definitions"

A Time-Domain Approach Based on the IEEE Std 1459-2000 for the detection of Loads Producing Harmonic Distortion

2008

This paper presents a novel strategy for the detection of harmonic sources in power systems for both the single-phase and the three-phase systems. It is based on the IEEE Std. 1459-2000 approach and it is based only on the separation of the fundamental components from the harmonic content of voltage and current. The proposed strategy do not require any spectral analysis of voltages and currents and it can be entirely implemented in the time domain. In the paper, the formulation of the novel approach is given and some simulation results are presented.

An enhanced approach based on IEEE 1459 for the detection of disturbing loads in distorted and unbalanced three-phase power systems

2009

This paper presents an enhanced approach for the detection of disturbing loads in distorted and/or unbalanced three-phase power systems in both cases of three and four-wires. It is based on the IEEE Std. 1459-2000 effective apparent power resolution and it requires only the separation of the fundamental components of voltage and current from the remaining harmonic content. In the paper, the formulation of the novel approach is given and some simulation results are presented.

Disturbing loads identification in power systems: a single-point time-domain method based on IEEE 1459-2000

2009

This paper presents a single-point method for the identification of prevailing disturbing loads in power systems for both single-phase and three-phase applications downstream or upstream from the metering section. It is based on the simultaneous measurement of three nonactive power quantities, which are based on the IEEE Std. 1459-2000 approach. The proposed method is only based on the separation of the fundamental components from the harmonic content of voltage and current; thus, it does not require any spectral analysis of the voltages and current. In this paper, the formulation of the proposed method and its time-domain implementation are described; moreover, some simulation results are …

Lay definitions of happiness across nations: The primacy of inner harmony and relational connectedness

2016

In well-being research the term happiness is often used as synonymous with life satisfaction. However, little is known about lay people's understanding of happiness. Building on the available literature, this study explored lay definitions of happiness across nations and cultural dimensions, analyzing their components and relationship with participants' demographic features. Participants were 2799 adults (age range = 30-60, 50% women) living in urban areas of Argentina, Brazil, Croatia, Hungary, India, Italy, Mexico, New Zealand, Norway, Portugal, South Africa, and United States. They completed the Eudaimonic and Hedonic Happiness Investigation (EHHI), reporting, among other information, th…

Distributed denial-of-service attacks in the Internet

2005

An empirical study of the understanding of formal propositions about sequences, with a focus on infinite limits

2018

International audience; In this paper, we analyze the answers of one group of high-school students and two groups of first-year University students to a questionnaire designed to test their level of recognition and understanding of the formal definition of the concept of infinite limit. Although this empirical study is ancillary to a larger project centred on didactic engineering, its analysis sheds light on the key issue of the logical prerequisites for the learning of the fundamental concepts of analysis. It also provides a new tool to investigate students' concept-image of limits, and assess the impact of teaching contexts and teaching paths.

Trolligans : Conceptual Links Between Trolling and Hooliganism in Sports and Esports

2023

Both game-based trolling and hooliganism have existed in some form since the inception of online gaming and professional sports respectively. The two share many characteristics: provocation of an opposing entity, the tendency to taunt or trash-talk others based on their social or individual identity, and disruptive and/or destructive behaviour. However, despite this and the increasing similarity between the worlds of traditional sports and esports, research on the two negatively perceived phenomena has remained largely separate. The present article aims to both link and distinguish the two types of behaviour in terms of what motivates them, the agents involved, and the spaces in which they…

Teolingvistika v kontekste sovremennyh âzykovedčeskih issledovanij

2021

Religion as one of the forms of social consciousness is the object of interest of various sciences, among which linguistics can be named. Theology, geography and ecology of religion, history and philosophy of religion, psychology of religion, the directions in which these studies are conducted are quite diverse: the language of theological texts, the problem of translation, stylistics, lexicology, lexicography, semantics, language communication and many others. In this article we are talking about the section of linguistics – theolinguistics.

IEEE Std. 1459 power quantities ratio approaches for simplified harmonic emissions assessment

2018

The paper investigates the suitability of using power ratio parameters for harmonic emissions assessment at the point of common coupling (PCC). The study is carried out starting from the IEEE Std. 1459-2010 apparent power decomposition, where power factors are defined for evaluating line utilization and harmonic pollution levels. In addition, the study investigates the behavior of new parameters, which are expressed in terms of ratio between IEEE Std. 1459-2010 power quantities. The study is carried out for both single-phase and three-phase case, also considering the presence of capacitors. ? 2018 IEEE.

Definitions of Innovation

2022

El documento forma parte de los materiales docentes programados mediante la ayuda del Servei de Política Lingüística de la Universitat de València.: Definiciones de Innovación Innovation definitions