Bamdezh wetland with the geographical coordinates of   north longitude, east latitude and an area of 44 square Kilometers, is located in about 40 km northwest of Ahvaz and Shavur River is the main source of its supply. This wetland is not only a habitat and suitable food source for aquatic and migratory birds, but as well a significant resource of income for the locals. Today, with the arrival ...

Bamdezh wetland with the geographical coordinates of   north longitude, east latitude and an area of 44 square Kilometers, is located in about 40 km northwest of Ahvaz and Shavur River is the main source of its supply. This wetland is not only a habitat and suitable food source for aquatic and migratory birds, but as well a significant resource of income for the locals. Today, with the arrival ...

1. introduction the effect of climate of the earth's surface is the result of interaction of different levels of atmosphere and lithosphere. one of the factors which influences that interaction is the way the system pressure transcends it. in this way, the system pressure changes and can be changed and eventually may become an environmental hazard and geomorphodynamic phenomenon. hazards are an...

Autumn migration of adult Eurasian hobbies Falco subbuteo from Europe to southern Africa was recorded by satellite telemetry and observed routes were compared with randomly simulated routes. Two non-random features of observed routes were revealed: (i) shifts to more westerly longitudes than straight paths to destinations and (ii) strong route convergence towards a restricted area close to the ...

This paper deals with the problem of state estimation for the vector-tracking loop of a software-defined Global Positioning System (GPS) receiver. For a nonlinear system that has the model error and white Gaussian noise, a noise statistics estimator is used to estimate the model error, and based on this, a modified iterated extended Kalman filter (IEKF) named adaptive iterated Kalman filter (AI...

Several studies have shown that experienced night-migratory songbirds can determine their position, but it has remained a mystery which cues and sensory mechanisms they use, in particular, those used to determine longitude (east-west position). One potential solution would be to use a magnetic map or signpost mechanism like the one documented in sea turtles. Night-migratory songbirds have a mag...

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...