Search results for "Reactance"

Analysing the effects of power swing on wind farms using instantaneous impedances

2020

Abstract Most of the grid disturbances happen due to the presence of faults and power swing. This article focuses on power swing in view of the amount of penetration of renewable energy resources especially the wind farms. There are two sections. First section approached power swing by deriving a mathematical expression which would be able to track the locus of impedance in time domain and subsequently analyze resistance and reactance simultaneously with respect to time. It used a grid comprising of generator, transmission line and load. The derived expression was compared with a power swing generated using RTDS model and the results were analyzed in R-X plane. Second section analyses the i…

Reactancia psicológica como explicación de la resistencia de los italianos a observar las medidas de seguridad durante el brote de COVID-19

2020

Reliability and variability of bioimpedance measures in normal adults: Effects of age, gender, and body mass

2003

This study aimed to analyze the reliability and evaluate the causes of variability of bioimpedance parameters. Direct measures were analyzed because they are not affected by inappropriate prediction models. Resistance (R), reactance (Xc), and phase angle (PA) were determined at three fixed frequencies (5, 50, and 100 kHz) in 653 normal Germans (244 males and 409 females), aged 20-90 years, using a phase-sensitive whole-body tetrapolar bioimpedance analyzer (BIA 2000-M, Data Input, Germany). From these values, six bioimpedance ratios were calculated (R(5)/R(50), R(5)/R(100), Xc(5)/Xc(50), Xc(5)/Xc(100), PA(5)/PA(50), and PA(5)/PA(100)). Reliability of duplicate measurements, as determined by…

How perceived persuasive intent and reactance contribute to third-person perceptions: evidence from two experiments

2016

In two experiments, this study presents a process model that explains third-person perceptions (TPP) as a function of perceived persuasive intent and reactance. Using two nonstudent samples, findings were internally replicated for two topics. The study shows that media messages evoking perceptions of persuasive intent also activate reactance, which in turn predicts TPP topic-independently. Remarkably, half of the total stimulus effect on TPP could be explained through reactance, which offers new implications for existing theoretical explanations of strong TPP after undesirable messages but weak effects after, for example, prosocial messages.

The Impact of Forced Answering and Reactance on Answering Behavior in Online Surveys

2020

Forced answering (FA) is a frequent answer format in online surveys that forces respondents to answer each question in order to proceed through the questionnaire. The underlying rationale is to decrease the amount of missing data. Despite its popularity, empirical research on the impact of FA on respondents’ answering behavior is scarce and has generated mixed findings. In fact, some quasi-experimental studies showed that FA has detrimental consequences such as increased survey dropout rates and faking behavior. Notably, a theoretical psychological process driving these effects has hitherto not been identified. Therefore, the aim of the present study was twofold: First, we sought to experi…

A Comparison of Special Bonding Techniques for Transmission and Distribution Cables

2020

In this paper, a review of the existing special bonding techniques for medium voltage (MV) and high-voltage (HV) cables is presented. Special bonding techniques have the purpose of reducing sheath currents, thereby limiting copper losses and the reduction of the ampacity of cables. The authors present a literature review to identify various bonding techniques and how these have evolved over the years thanks to new technologies. Simulations of the most used techniques have been performed in Matlab/Simulink, to compare their strengths and drawbacks.

Magnetic Field and Short-Circuit Reactance Calculation of the 3-Phase Transformer with Symmetrical Amorphous Core

2006

Magnetically symmetric, 3- phase transformer has been analysed. For the two variants of the windings, the calculation results have been compared with the measured ones. Magnetic flux density components were calculated in and out of the core. The flux distribution and short-circuit reactance have been verified experimentally and a good agreement has been obtained.

Effects of Equivalence Framing on the Perceived Truth of Political Messages and the Trustworthiness of Politicians

2017

Recent studies in psychology have shown that the framing of a message affects judgments about its truth, as negatively framed statements are perceived as more trustworthy than formally equivalent, positively framed statements. The current work examines this effect in the contexts of political communication and public opinion. The results of three experiments show that equivalence framing affects both the perceived truth of political messages and the trustworthiness of its source, and that one cause of this effect is that recipients have learned to associate negativity with news and positivity with persuasive communication through media exposure. Consequently, we find that positively framing…

Solid rotor induction machines for use in electrically-assisted turbochargers

2006

The stator leakage reactance has a major influence on the performance of a solid rotor induction machine. It is larger and it is more difficult to define and calculate than in a cage-rotor machine. When the higher leakage reactance is taken into account, the equivalent circuit model gives predictions of sufficient precision for design purposes. The airgap, normally chosen to be quite small, is preferably quite large by general standards. The torque varies as (V/f) 3 which makes it difficult to provide a wide range of constant power operation in a variable speed application. Slitting the rotor helps to improve the characteristic for variable-speed duties.

The paradoxical effects of communicating CSR activities: Why CSR communication has both positive and negative effects on the perception of a company’…

2022

Abstract Supporting societal goals and sustainable developments can help a company to be seen as socially responsible. This corporate social responsibility (CSR) must be communicated effectively as too intensive communication could negatively affect the company’s perception. These negative effects may be caused by an imbalance between the amount of CSR communication and the actual extent of CSR activities. Two experiments show that increased CSR communication has a negative indirect effect on perceptions of a company’s social responsibility, mediated by persuasive intent and reactance. However, depending on the extent of a company’s actual CSR activities, there is also a countervailing dire…