نتایج جستجو برای: ray city
تعداد نتایج: 456489 فیلتر نتایج به سال:
Currently, for the planning of wireless cellular networks in urban scenarios either empirical (direct ray or over rooftop ray) or ray-optical (ray tracing) propagation models are used. In this paper both approaches are compared to one another and to measurements in different urban city centers. Additionally a new concept which is called Dominant Path Model (DPM) is presented in this paper. This...
Stereo data collected by the HiRes experiment over a six year period are examined for largescale anisotropy related to the inhomogeneous distribution of matter in the nearby Universe. We consider the generic case of small cosmic-ray deflections and a large number of sources tracing the matter distribution. In this matter tracer model the expected cosmic ray flux depends essentially on a single ...
this study is aimed to identify sources of particulate matter with mean aerodynamic diameterbelow 10 μm (pm10) present in the atmosphere of the metropolitan area of mexico city (mamc), usingsamples obtained from january 1st to june 30th, 2009, analyzed with x-ray spectrometric techniques.minivol samplers were used to collect samples on polycarbonate filters in three sites (north, center, andsou...
Dust is one of the environmental problems in Kerman city. Due to the major aspect of mineralogy in environmental studies, mineralogy and chemical studies of dust in different regions of the city performed by microscopic thin sections, x ray diffraction (XRD) and ICP-MS. In all areas of the city, minerals such as calcite, quartz, feldspar, pyroxene, micas, Jaffeite, gismondine and clay mineral w...
this study aims to investigate value conflicts between mothers and their daughters among families and influential factors on this conflict in yazd city. this study adopted a survey method and a questionnaire was used that its validity through construct validity (factor analysis) and its reliability by cronbach alpha were measured. the population of this study consists of all yazdian families th...
this study is aimed to identify sources of particulate matter with mean aerodynamic diameterbelow 10 μm (pm10) present in the atmosphere of the metropolitan area of mexico city (mamc), usingsamples obtained from january 1st to june 30th, 2009, analyzed with x-ray spectrometric techniques.minivol samplers were used to collect samples on polycarbonate filters in three sites (north, center, andsou...
Background & Objectives: Food insecurity has been a global concern. The purpose of the present study was to examine the relationship between household food insecurity and depression in mothers with school children in Ray city.Methods: A cross-sectional survey of 430 mothers of school children was conducted in 2010 in Ray city. We employed USDA food security questionnaire. The prevalence of ...
Measurements in a highly polluted Asian mega city: observations of aerosol number size distribution, modal parameters and nucleation events P. Mönkkönen, I. K. Koponen, K. E. J. Lehtinen, K. Hämeri , R. Uma, and M. Kulmala University of Helsinki, Department of Physical Sciences, Finland Finnish Institute of Occupational Health, Helsinki, Finland The Energy and Resources Institute (TERI), New De...
This paper presents an explicit formula for propagation path loss prediction of microcellular communication in an urban street scene. The formula is derived based on geometrical optics and diffraction theory and it takes into account multiple reflections along main streets, side streets and diffractions around corners. Comparisons between our theoretical results with measurements and ray tracin...
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