P.4.009 EEG mapping in diagnostic assessment of patients with mild dementia

Колыхалов, И. В.; Изнак, А. Ф.; Chayanov, N. V.; Vasilieva, A.G.; Zhigulskaya, S.E.

doi:10.1016/s0924-977x(97)88818-9

Cited by 3 publications

(3 citation statements)

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“…Nayakshin, Sazonov & Sunyaev (2012) have recently suggested that AGN may be surrounded by several-pc-scale clouds of asteroids and planets that have been formed in situ. In this model, star formation episodes take place inside a massive self-gravitating AGN accretion disc (Paczynski 1978;Kolykhalov & Syunyaev 1980;Collin & Zahn 1999;Goodman 2003;Paumard et al 2006;Nayakshin, Cuadra & Springel 2007) during gas-rich phases when the SMBH grows rapidly. The AGN disc orientation performs a random walk due to chaotic mass deposition events of individual large gas clouds (as argued by King & Pringle 2006;Nayakshin & King 2007;Hobbs et al 2011).…”

Section: Summary On Asteroid Disruptionmentioning

confidence: 99%

Sgr A* flares: tidal disruption of asteroids and planets?

Zubovas

Nayakshin

Markoff

2012

Monthly Notices of the Royal Astronomical Society

101

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It is theoretically expected that a supermassive black hole (SMBH) in the centre of a typical nearby galaxy disrupts a Solar-type star every ~ 10^5 years, resulting in a bright flare lasting for months. Sgr A*, the resident SMBH of the Milky Way, produces (by comparison) tiny flares that last only hours but occur daily. Here we explore the possibility that these flares could be produced by disruption of smaller bodies - asteroids. We show that asteroids passing within an AU of Sgr A* could be split into smaller fragments which then vaporise by bodily friction with the tenuous quiescent gas accretion flow onto Sgr A*. The ensuing shocks and plasma instabilities may create a transient population of very hot electrons invoked in several currently popular models for Sgr A* flares, thus producing the required spectra. We estimate that asteroids larger than ~ 10 km in size are needed to power the observed flares, with the maximum possible luminosity of the order 10^39 erg s^-1. Assuming that the asteroid population per parent star in the central parsec of the Milky Way is not too dissimilar from that around stars in the Solar neighbourhood, we estimate the asteroid disruption rates, and the distribution of the expected luminosities, finding a reasonable agreement with the observations. We also note that planets may be tidally disrupted by Sgr A* as well, also very infrequently. We speculate that one such disruption may explain the putative increase in Sgr A* luminosity ~ 300 yr ago.Comment: 11 pages. MNRAS submitte

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Section: Summary On Asteroid Disruptionmentioning

confidence: 99%

Sgr A* flares: tidal disruption of asteroids and planets?

Zubovas

Nayakshin

Markoff

2012

Monthly Notices of the Royal Astronomical Society

101

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“…The justification itself should consist of a proper explanation on how the observations allowed to state the final diagnosis of the observed phenomena (diseases) [3]. This skill is crucial for the diagnosis of phenomena in charts like EEG or ECG [7,10]. To be able to provide a correct interpretation, a physician has to determine both structural features of EEG/ECG charts and numerical parameters (frequency of QRS complexes, segments' lengths, etc.).…”

Section: Introductionmentioning

confidence: 99%

DPAR grammars for ECG diagnosis justification

2017

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“…Unfortunately, although this skill is crucial for improving diagnostic competencies, medical students frequently exhibit a poor diagnostic justification performance [36]. The skill is especially important, if an interpretation of charts like ECG, EEG is concerned [18,19]. Such an interpretation is made on the basis of structural features of the charts, as well as parametric values (frequencies of waves, lengths of segments, etc).…”

Section: Introductionmentioning

confidence: 99%

Syntactic pattern recognition of ECG for diagnostic justification

Flasiński

2014

MG&V

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A novel hybrid structural-parametric model for ECG diagnostic justification is presented in the paper. In order to distinguish between specific subclasses of heart dysfunction phenomena both grammars and automata are enhanced with a formalism of dynamic programming. It allows one to construct a system, which is feasible for aiding a process of teaching and evaluating medical students' diagnostic reasoning in the area of electrocardiography.

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P.4.009 EEG mapping in diagnostic assessment of patients with mild dementia

Cited by 3 publications

References 0 publications

Sgr A* flares: tidal disruption of asteroids and planets?

Sgr A* flares: tidal disruption of asteroids and planets?

DPAR grammars for ECG diagnosis justification

Syntactic pattern recognition of ECG for diagnostic justification

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