نتایج جستجو برای: source radius 233 km

تعداد نتایج: 524164  

Journal: :IEEE Trans. Vehicular Technology 2001
Bashir El-Jabu Raymond Steele

This paper is devoted to the study of cellular communications using aerial platforms (APs). A set of key equations is derived that quantify the coverage area on the ground as a function of AP elevation, the operation of the adaptive multibeam antenna on the AP, and the formulation of contiguous terrestrial cells and their shapes. Specifically, we consider the deployment of an AP to provide terr...

2008
Jae-Hun Park D. Randolph Watts Kathleen A. Donohue Steven R. Jayne

[1] Ocean bottom pressure estimates from Gravity Recovery and Climate Experiment (GRACE) have been validated by comparisons with an array of in situ bottom pressure measurements. The 600 km by 600 km array comprised 46 bottom pressure sensors that were part of the Kuroshio Extension System Study (KESS). Validations in other ocean regions have been limited by available data to pointwise bottom p...

2003
C. S. Kochanek

We develop a general method for analyzing the light curves of microlensed quasars and apply it to the OGLE light curves of the four-image lens Q2237+0305. We simultaneously estimate the effective source velocity, the average stellar mass, the stellar mass function, and the size and structure of the quasar accretion disk. The light curves imply an effective source plane velocity of 10200 km/s <∼...

2005
PENN LLOYD THOMAS E. MARTIN ROLAND L. REDMOND UTE LANGNER MELISSA M. HART

Forest fragmentation may cause increased brood parasitism and nest predation of breeding birds. In North America, nest parasitism and predation are expected to increase closer to forest edges because the brood-parasitic Brown-headed Cowbird (Molothrus ater) and generalist nest predators often enter the forest from adjoining developed (largely agricultural) habitats. Yet the abundance of brood p...

2012
Yoon-Ok Ahn Zhong Min Li

This study evaluated cancer risk for adult residents near Nuclear Power Plants (NPPs) in Korea through a valid prospective cohort study during 1992-2010. The study cohort was composed of 11,367 adults living within a five km radius from the NPPs for the exposed and 24,809 adults for the non-exposed or reference cohort set at two different levels of proximity; 5-30 km radius and more than 30 km ...

2008
João Lopes Luís M. Correia Luís Santo

The main purpose of this thesis was to analyse and compare UMTS HSDPA and HSUPA capacity and coverage. For this purpose, a single user model was developed for the calculation of the maximum cell radius. This model was adapted to a multiple users and multiple services scenario. The results from the single user model, as well as the ones from the multiple users simulator, were compared with measu...

2006
Bao-An Li Andrew W. Steiner

Neutron star radii are primarily determined by the pressure of isospin asymmetric matter which is proportional to the slope of the nuclear symmetry energy. Available terrestrial laboratory data on the isospin diffusion in heavy-ion reactions at intermediate energies constrain the slope of the symmetry energy. Using this constraint, we show that the radius (radiation radius) of a 1.4 solar mass ...

شایسته, کامران, غریبی, شیوا,

Traffic noise pollution is a serious threat to wildlife species, resulting in isolating and reducing the population. The Asian Highway of Tehran-Mashhad, from which a 26.51 km long part is located inside Golestan National Park, is the main source of noise disturbance inside the area. The purpose of this study was to determine the most important criteria for noise pollution of this road; in orde...

2013
Andrew W. Steiner Tobias Fischer Stefano Gandolfi Matthias Hempel

Neutron star mass and radius measurements are becoming sufficiently accurate as to offer astrophysical constraints on the properties of neutron-rich matter near the nuclear saturation density. Current observations, which imply that the radius of a 1.4 solar mass neutron star lies between 10.4 and 12.9 km (95% confidence), also imply that 43 < L < 67 MeV, where L is a parameter describing the sl...

2014
T. Roberts C. O'Connor J. Nuñez-Garcia R. de la Rua-Domenech N. H. Smith

Context Tuberculosis (TB) in British cattle caused by Mycobacterium bovis has only sporadically affected companion animals. Between December 2012 and March 2013, seven laboratoryconfirmed cases of M bovis infection in cats were seen at one veterinary clinic in Newbury, Berkshire, UK. Two more cats with suspected M bovis infection were identified in the same time frame. All nine cats were from s...

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