2,473 research outputs found
Linear Theory of Electron-Plasma Waves at Arbitrary Collisionality
The dynamics of electron-plasma waves are described at arbitrary
collisionality by considering the full Coulomb collision operator. The
description is based on a Hermite-Laguerre decomposition of the velocity
dependence of the electron distribution function. The damping rate, frequency,
and eigenmode spectrum of electron-plasma waves are found as functions of the
collision frequency and wavelength. A comparison is made between the
collisionless Landau damping limit, the Lenard-Bernstein and Dougherty
collision operators, and the electron-ion collision operator, finding large
deviations in the damping rates and eigenmode spectra. A purely damped entropy
mode, characteristic of a plasma where pitch-angle scattering effects are
dominant with respect to collisionless effects, is shown to emerge numerically,
and its dispersion relation is analytically derived. It is shown that such a
mode is absent when simplified collision operators are used, and that
like-particle collisions strongly influence the damping rate of the entropy
mode.Comment: 23 pages, 10 figures, accepted for publication on Journal of Plasma
Physic
Customer engagement: Growing relevance in marketing research
Within marketing research, the number of studies about customer engagement has been growing, emerging mainly after 2005 (Brodie et al., 2011), which reflects the increasing interest of researchers on the topic. The purpose of this study is to provide a systematic literature review to answer to the research question: “What marketing research has been conducted on customer engagement until now and what could be future avenues for research?”info:eu-repo/semantics/publishedVersio
How VR can boost inspiration and increase donations
One of the major challenges that non-profit organizations face is inspiring people to be concerned about
issues that seem geographically and emotionally distant. The aim of this study is to explore how Virtual
Reality (VR) can boost inspiration and encourage potential donors to contribute to nonprofit fundraisings. To
achieve this aim, a three group between-subjects experiment was conducted to examine how varying the
degree of immersiveness of a short documentary about a remote health issue influences user reported social
and spatial presence, inspiration, and donation intention. Findings reveal that perceived media richness
gradually increases the user's spatial presence. Then, the positive effect of social and spatial presence on
customer inspiration was tested and successfully verified. Finally, customer inspiration increases donation
intention.info:eu-repo/semantics/publishedVersio
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