1,720,972 research outputs found
A Vlasov-Poisson plasma model with non-L1 data
No full textIt is considered the Vlasov-Poisson equation for a plasma confined in an unbounded cylinder and it is proven an existence and uniqueness result for non-L-1 (but almost L-1) initial charge distribution. Copyright (C) 2004 John Wiley Sons, Ltd
Time evolution of a Vlasov–Poisson plasma with different species and infinite mass in R3
Full text linkWe study existence and uniqueness of the solution to the Vlasov–Poisson system describing a plasma constituted by different species evolving in R3, whose particles interact via the Coulomb potential. The species can have both positive or negative charge. It is assumed that initially the particles are distributed according to a spatial density with a power-law decay in space, allowing for unbounded mass, and an exponential decay in velocities given by a Maxwell–Boltzmann law, extending a result contained in Caprino et al. (J Stat Phys 169:1066–1097,2017), which was restricted to finite total mass
The homogeneous Boltzmann hierarchy and statistical solutions to the homogeneous Boltzmann equation
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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