X-ray spectral variability of the Seyfert galaxy NGC 4051     

G. Lamer  I. M. MHardy  P. Uttley  K. Jahoda 《Monthly notices of the Royal Astronomical Society》2003,338(2):323-330

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Imaging X-ray Polarimeter for Solar Flares (IXPS)     

Michael Hosack  J. Kevin Black  Philip Deines-Jones  Brian R. Dennis  Joanne E. Hill  Keith Jahoda  Albert Y. Shih  Christian E. Urba  A. Gordon Emslie 《Experimental Astronomy》2011,32(2):101-125

We describe the design of a balloon-borne Imaging X-ray Polarimeter for Solar flares (IXPS). This novel instrument, a Time Projection Chamber (TPC) for photoelectric polarimetry, will be capable of measuring polarization at the few percent level in the 20?C50 keV energy range during an M- or X-class flare, and will provide imaging information at the ??10 arcsec level. The primary objective of such observations is to determine the directivity of nonthermal high-energy electrons producing solar hard X-rays, and hence to learn about the particle acceleration and energy release processes in solar flares. Secondary objectives include the separation of the thermal and nonthermal components of the flare X-ray emissions and the separation of photospheric albedo fluxes from direct emissions.  相似文献   

On Motion of Wind Waves     

Jahoda  Karel  Spanila  Tamara 《Water Resources》2004,31(3):266-270

Parameters of wind waves in a deep-water zone of a reservoir is studied in the context of wave influence on shore stability. Data from measurements of wave parameters in reservoirs of Czech Republic are used. The relationship between the period and phase velocity of wind waves is discussed.  相似文献   

X-ray and γ-ray spectra and variability of the black hole candidate GX 339–4     

Grzegorz Wardzi&#;ski  rzej A. Zdziarski  Marek Gierli&#;ski  J. Eric Grove  Keith Jahoda  W. Neil Johnson 《Monthly notices of the Royal Astronomical Society》2002,337(3):829-839

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