501,708 research outputs found
Time interval distributions of atoms in atomic beams
We report on the experimental investigation of two-particle correlations
between neutral atoms in a Hanbury Brown and Twiss experiment. Both an atom
laser beam and a pseudo-thermal atomic beam are extracted from a Bose-Einstein
condensate and the atom flux is measured with a single atom counter. We
determine the conditional and the unconditional detection probabilities for the
atoms in the beam and find good agreement with the theoretical predictions.Comment: 4 pages, 3 figure
DMA precise time and time interval requirements
Defense Mapping Agency timing requirements ranging from milliseconds to tenths of nanoseconds and its use of geodetic astronomy and satellite geodesy programs are discussed in detail
Correlated fractional counting processes on a finite time interval
We present some correlated fractional counting processes on a finite time
interval. This will be done by considering a slight generalization of the
processes in Borges et al. (2012). The main case concerns a class of space-time
fractional Poisson processes and, when the correlation parameter is equal to
zero, the univariate distributions coincide with the ones of the space-time
fractional Poisson process in Orsingher and Polito (2012). On the other hand,
when we consider the time fractional Poisson process, the multivariate finite
dimensional distributions are different from the ones presented for the renewal
process in Politi et al. (2011). Another case concerns a class of fractional
negative binomial processes
Precise time and time interval users, requirements and specifications
The functional areas of application of Precise Time and Time Interval (PTTI) were considered and expanded. A comprehensive overview of the PTTI requirements and applications would provide an opportunity for individuals working in a specific functional area. Mutual problems, requirements, applications or successes shared by those in other functional areas were studied. Based upon the results of a two year study a compendium of PTTI requirements, applications and the means of meeting the requirements among Department of Defense components, other government agencies and major commercial users was compiled and is presented. It was found that the planning process for PTTI support for new acquisitions or new programs was less than a well defined, coordinated process. The processes are described in general terms and a generic model for requirements determination and subsequent coordination which may enhance the planning process and introduce cost benefits to the program is also presented
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