نتایج جستجو برای: کد fountain
تعداد نتایج: 7863 فیلتر نتایج به سال:
Recently, data of taken with the OSSE experiment have been combined with scanning observations by TGRS and SMM to produce maps of the narrow Galactic 511 keV line emission (Purcell et al. 1997). A modelling of the combined data give evidence for three distinct features: the Galactic plane, a central bulge, and an extended emission region at positive latitudes above the Galactic center. It has b...
BACKGROUND A gastroenteritis outbreak was associated with playing in a norovirus-contaminated recreational fountain. OBJECTIVE AND STUDY DESIGN A retrospective cohort study was performed to estimate the magnitude of the outbreak and identify its source. Epidemiological investigation included standardized questionnaires about sex, age, school, class, risk exposures, and illness characteristics...
The inefficient usage of limited radio spectrum resources with its increased demand has opened the doors for an innovative communication technology. The recently proposed concept of cognitive radio network can use the licensed bands of primary users for its data transmission without causing interference to them. The LT (Luby Transform) code and Raptor code, types of Fountain codes (class of era...
Using information from a recent Rb two-color photoassociation experiment, we evaluate the merits of fountain clocks based on Rb and Rb isotopes as alternatives to Cs and find that they offer significant advantages. In the case of Rb the collisionally induced fractional frequency shift is 15 times smaller than for Cs. This small shift is associated with a small difference in the triplet and sing...
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