Some Computational Aspects of Gaussian CARMA Modelling

Representation of continuous-time ARMA, CARMA, models is reviewed. Computational aspects of simulating and calculating the likelihood-function of CARMA are summarized. Some numerical properties are illustrated by simulations. Some real data applications are shown.CARMA, maximum-likelihood, spectrum, Kalman filter, computation

Non-linear Q-clouds around Kerr black holes

Q-balls are regular extended `objects' that exist for some non-gravitating, self-interacting, scalar field theories with a global, continuous, internal symmetry, on Minkowski spacetime. Here, analogous objects are also shown to exist around rotating (Kerr) black holes, as non-linear bound states of a test scalar field. We dub such configurations Q-clouds. We focus on a complex massive scalar field with quartic plus hexic self-interactions. Without the self-interactions, linear clouds have been shown to exist, in synchronous rotation with the black hole horizon, along 1-dimensional subspaces - existence lines - of the Kerr 2-dimensional parameter space. They are zero modes of the superradiant instability. Non-linear Q-clouds, on the other hand, are also in synchronous rotation with the black hole horizon; but they exist on a 2-dimensional subspace, delimited by a minimal horizon angular velocity and by an appropriate existence line, wherein the non-linear terms become irrelevant and the Q-cloud reduces to a linear cloud. Thus, Q-clouds provide an example of scalar bound states around Kerr black holes which, generically, are not zero modes of the superradiant instability. We describe some physical properties of Q-clouds, whose backreaction leads to a new family of hairy black holes, continuously connected to the Kerr family.Comment: 11 pages, 4 figure

Hydrographic measurements in Jökulsárlón lagoon, Iceland

Jökulsárlón lagoon is an enclosed lake bordering the retreating Breidamerkurjökull glacier which flows down from the Vatnajökull ice cap. As the glacier calves most of the ice it releases decays within the lake and the addition of the stored fresh water modifies the water local properties. The lake itself is connected to the North Atlantic Ocean through a narrow channel only ~80 m wide, and all tidal and residual flows in and out of the lake are through this channel. In April 2012 (early spring) we conducted four hydrographic sections from a small boat to determine the early season hydrographic structure of the lake. We conducted two hydrographic sections from the entrance of the channel to sea across the lagoon to the Breidamerkurjökull glacier, one across the centre of the lagoon, and one along, and close to the glacier face. Four months of time series hydrographic data from the channel show that the oceanic tidal pulse into the lagoon is short in duration. The water that enters the lagoon is warm and saline enough to descend rapidly to the greatest depths within the lagoon. With our CTD measurements we have mapped the properties of water across the lake. These reveal the pathway of the Atlantic derived water towards the ice face. The warmest water measured within the lagoon was just below the surface and only adjacent to the glacier face. Whilst this warm water was created from solar input, its location and concentration reveal the complex density driven circulation patterns close to the ice face. Calculated oceanic driven melt rates from the ice face show enhanced oceanographic melting in this near surface layer which contributes to the more substantial deeper melting

Dermatoloogia 21. sajandil

Eesti Arst 2011; 90(8):359–36

Kolmkümmend aastat ehhokardiograafiat Eestis

Artikkel annab ülevaate ehhokardiograafia kasutamise algusaastatest Eestis ning põhineb autori ja kolleegide dr Eevi Maiste ning dr Silvi Saretoki mälestustel. Eesti Arst 2006; 85 (4): 247–24

Orofacial granulomatosis (OFG) : sjúkdómstilfelli

Neðst á síðunni er hægt að nálgast greinina í heild sinni með því að smella á hlekkinn View/OpenMig langar til þess að kynna fyrir ykkur frekar sjaldgæfan sjúkdóm, sem nýtur þrátt fyrir það, töluverðar athygli meðal lækna og tannlækna þar sem tíðnin virðist vera að aukast. Tengja það margir breytingu á ofnæmissvörunum samfara breytingu á lífsháttum vesturlandabúa

Multidistsiplinaarne geriaatriline hindamine – võimalus eaka inimese probleemide ja vajaduste objektiivseks hindamiseks ning ressursside otstarbekaks kasutamiseks

Eesti Arst 2018; 97(4):225–227 &nbsp