The 3G mobile phone has propagation problems in urban areas and experiences severe congestion after major disasters in supporting mobile eHealth. We expect a Quasi-zenith satellite with nationwide coverage. In near future, the data transmission of image of pharygoscopy, motion picture of light reflex, 12-leads ECG, automated ultrasonic echo and vital signs from ambulances shall be performed to ...

The sensitivity of imaging atmospheric Čerenkov telescopes (IACTs) in TeV γ-ray observations reachs its maximum at small zenith angles (Θ ≤ 30◦) which provide the minimum attainable energy threshold of an instrument. However, for a specific telescope site a number of γ-ray sources, or source candidates, can only be observed at much larger zenith angles (Θ ≤ 60◦). Moreover the observations at la...

PURPOSE To assess numerically the flexibility and mechanical stresses undergone by stents and fabric of currently manufactured stent-grafts. METHODS Eight marketed stent-graft limbs (Aorfix, Anaconda, Endurant, Excluder, Talent, Zenith Flex, Zenith LP, and Zenith Spiral-Z) were modeled using finite element analysis. A numerical benchmark combining bending up to 180° and pressurization at 150 ...

The problem of mitigating atmospheric turbulence-induced distortions from imagery measured by astronomical and space surveillance telescopes operating at high zenith angles is addressed here. Most previous research in this problem has emphasized operation at relatively small zenith angles, where turbulence effects are less severe, and effects arising from relatively weak phase distortions domin...

The results of an experiment combining Doppler beam steering (DBS) and angle of arrival (AOA) measurements are presented. Non-zero values of vertical beam AOAs and oo-zenith DBS power measurements have been attributed to the action of tilted specular layers by various authors. This study aims to directly compare the two sets of measurements in an eeort to determine whether the action of tilting...

Zenith skylight is often distinctly blue during clear civil twilights, and much of this color is due to preferential absorption at longer wavelengths by ozone's Chappuis bands. Because stratospheric ozone is greatly depleted in the austral spring, such decreases could plausibly make Antarctic twilight colors less blue then, including at the zenith. So for several months in 2005, we took digital...

When traversing the earth’s neutral atmosphere, GPS radio signals are affected significantly by the variability of its refractive index, which causes primarily a delay, usually referred to in the literature as the tropospheric delay. An inaccurate modeling of this delay results in degradation of position estimates, affecting mainly the height component. The tropospheric delay is commonly divide...

We present here results from large zenith-angle observations with the CAT atmospheric Cherenkov imaging telescope, based on data taken on the Crab Nebula and on the blazar Mk501 from 1996 onwards. From Monte Carlo simulations, the threshold energy of the telescope is expected to vary from about 250 GeV at zenith to about 2 TeV at a zenith angle of 60 •. The lower source-fluxes due to the increa...

muḥyī al-dīn maghribī is among the few astronomers of the middle ages whose astronomical system is entirely based on new measures of planetary parameters and whose measurement of the observational data and calculation processes for determining their amount have been carried out in maragha observatory. he has explained the details of his observations and calculations in a volume called talkhīṣ a...

This paper describes Zenith, a discovery system that performs constructive induction. The system is able to generate and extend new features for concept learning using agenda-based heuristic search. The search is guided by feature worth (a composite measure of discriminability and cost). Zenith is distinguished from existing constructive induction systems by its interaction with a performance s...