نتایج جستجو برای: longitude
تعداد نتایج: 3770 فیلتر نتایج به سال:
Shortly after The Royal Society’s founding in 1660, Christiaan Huygens, in partnership with the Society, set out to solve the outstanding technological challenge of the day: the longitude problem, i.e. nding a robust, accurate method of determining longitude for maritime navigation (Yoder 1990). Huygens had invented the pendulum clock in 1657 (Burke 1978) and, subsequently, had demonstrated m...
a simple semi-phenomenological model, which accurately predicts the dependence of thresholdcurrent for temperature of resonant-phonon three well quantum cascade laser based on verticaltransitions is offered. we found that, the longitude optical phonon scattering of thermally excitedelectrons is the most important limiting factor for thermal performance of high frequency thz qcls.in low frequenc...
This contribution is the first of a two-part investigation into an unseasonal post-sunset equatorial F-region irregularity (EFI) event over the Southeast Asian region on the evening of 28 July 2014. Ground-based GPS scintillation data, space-based GPS radio occultation (RO) data, and ionosonde data show the existence of EFIs shortly after sunset over a region spanning 30° in longitude and 40° i...
An analysis of 10 years of campaign Global Positioning System (GPS) data collected in periodic surveys of the Basin and Range shows that vertical velocity measurement is less precise than horizontal measurements by approximately a factor of 3, and less precise than velocities from continuous GPS sites by a factor of 3-4. To obtain this level of precision, a method for conservatively quantifying...
OBJECTIVES To know the prevalence of leptospirosis cases reported in private clinics among fever cases in Villupuram District, Tamil Nadu, India to know its real magnitude of the problem and to diagnose Leptospirosis among fever cases from differential diagnosis. METHODS 1502 Blood serum samples collected from three urban towns namely Kallakurichi (Latitude: 11° 73' N; Longitude: 78° 97' E), ...
Planetary orientation models describe the orientation of the spin axis and prime meridian of planets in inertial space as a function of time. The models are required for the planning and execution of Earth-based or space-based observational work, e.g. to compute viewing geometries and to tie observations to planetary coordinate systems. The current orientation model for Mercury is inadequate be...
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