Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Einar Mjølhus"'
Autor:
Einar Mjølhus
Publikováno v:
Nonlinear Processes in Geophysics, Vol 16, Iss 2, Pp 251-264 (2009)
MHD solitons are studied in a model where the usual Hall-MHD model is extended to include the finite Larmor radius (FLR) corrections to the pressure tensor. The resulting 4-dimensional set of differential equations is treated numerically. In this ext
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8548fd8161e424fcadd90b09d768ce36
https://www.nonlin-processes-geophys.net/16/251/2009/
https://www.nonlin-processes-geophys.net/16/251/2009/
Autor:
Ola Flaaten, Einar Mjølhus
Publikováno v:
Environmental and Resource Economics. 47:125-148
This paper demonstrates analytically how a nature reserve may protect the total population, realize maximum sustainable yield (MSY) and economic yield (EY) and how this depends on biological growth, migration, reserve size and economic parameters. Th
Autor:
Einar Mjølhus, Ola Flaaten
Publikováno v:
Natural Resource Modeling. 18:157-182
This paper investigates theoretically to what extent a nature reserve may protect a uniformly distributed population of fish or wildlife against negative effects of harvesting. Two objectives of this protection are considered: avoidance of population
Publikováno v:
Journal of Mathematical Biology. 50:1-21
Synchronization, i.e., convergence towards a dynamical state where the whole population is in one age class, is a characteristic feature of some population models with semelparity. We prove some rigorous results on this, for a simple class of nonline
Publikováno v:
Journal of Geophysical Research: Space Physics. 106:18525-18542
In experiments where ground-based VHF/UHF radars are used to diagnose Langmuir turbulence driven by powerful HF waves transmitted from the ground into the ionosphere, there has been a severe observability aspect: The excited Langmuir wave vector spec
Autor:
Einar Mjølhus
Publikováno v:
Journal of Plasma Physics. 58:747-769
Parametric instabilities of upper-hybrid oscillations trapped in a plasma density depletion across an ambient magnetic field are investigated. Approximate dispersion relations are derived, which lead to the identification of two parametric instabilit
Autor:
Arild Wikan, Einar Mjølhus
Publikováno v:
Journal of Mathematical Biology. 35:195-239
The effect of overcompensatory recruitment and the combined effect of overcompensatory recruitment and generation delay in discrete nonlinear age-structured population models is studied. Considering overcompensatory recruitment alone, we present form
Autor:
Einar Mjølhus, Arild Wikan
Publikováno v:
Journal of Theoretical Biology. 173:109-119
The instabilities of the equilibria of a class of time discrete population growth models are studied. The models describe the growth of one species with age structure, where the survival probabilities are assumed to depend on the total population. In
Publikováno v:
Physical Review Letters
Physical Review Letters, 2012, 108, pp.105003. ⟨10.1103/PhysRevLett.108.105003⟩
Physical Review Letters, American Physical Society, 2012, 108, pp.105003. ⟨10.1103/PhysRevLett.108.105003⟩
Physical Review Letters, American Physical Society, 2012, 108, pp.105003. 〈10.1103/PhysRevLett.108.105003〉
Physical Review Letters, 2012, 108, pp.105003. ⟨10.1103/PhysRevLett.108.105003⟩
Physical Review Letters, American Physical Society, 2012, 108, pp.105003. ⟨10.1103/PhysRevLett.108.105003⟩
Physical Review Letters, American Physical Society, 2012, 108, pp.105003. 〈10.1103/PhysRevLett.108.105003〉
Langmuir cavitons have been artificially produced in the earth's ionosphere, but evidence of naturally-occurring cavitation has been elusive. By measuring and modeling the spectra of electrostatic plasma modes, we show that natural cavitating, or str
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b1240249fa301c386ef38677a0309f91
https://hal.science/hal-00557486/file/isham2012.pdf
https://hal.science/hal-00557486/file/isham2012.pdf
Autor:
Michael T. Rietveld, Tim K. Yeoman, Einar Mjølhus, Michael Kosch, M. Ashrafi, Satonori Nozawa
Publikováno v:
Journal of Geophysical Research: Space Physics. 116
[1] We experimentally observe the location and angular size of the high-frequency (HF) radio window in the bottomside ionosphere, which permits radio wave propagation to the topside ionosphere, with high angular resolution at the European Incoherent