Results 111 to 120 of about 5,686 (263)

A Small Power Margin and Bandwidth Expansion Allow Data Transmission during Rainfall despite Large Attenuation: Application to GeoSurf Satellite Constellations at mm–Waves

open access: yes
The traditional approach of considering the probability distribution of rain attenuation leads to provide very large power margin (overdesign) in data channels.
Emilio Matricciani
core   +1 more source

Analysis of non-rainy attenuation on earth-space path in Ota, Southwest Nigeria [PDF]

open access: yes, 2017
Propagation effects due to atmospheric gases and tropospheric scintillation requires accurate modelling in the design of satellite communication systems.
Omotosho, T. V.   +5 more
core  

Are there morpho‐acoustic patterns of adaptation in nonhuman primate ears? Testing the role of ecology and habitat in shaping ear morphology and function

open access: yesThe Anatomical Record, EarlyView.
Abstract Analysis of the variation in the bony structures of the inner and middle ear provides critical insights into functional morphology, as well as adaptive morphology across primates. In this study, we investigated whether ear morphology patterns are related to the ecological characteristics of species and their habitats to test two acoustic ...
Myriam Marsot   +4 more
wiley   +1 more source

Comparative study of UVB attenuation observerd during dry and wet seasons in a South American region

open access: yes, 2004
This work shows a comparative study about UVB attenuation over a South American region, during wet season (with low aerosol loads and cloudy days) and dry season (with biomass burning aerosol predominance in clear-sky days). The analysis was based on UVB
Bottino, Marcus J.   +3 more
core  

Ontogeny of murine bony semicircular canal form

open access: yesThe Anatomical Record, EarlyView.
Abstract The labyrinthine geometry and functional anatomy of the semicircular canals have intrigued scientists for decades, and there has been considerable interest in understanding how these complex structures grow and develop with evidence emerging from human studies that size maturation occurs exceptionally early by comparison with other systems ...
Marcela Cárdenas‐Serna   +1 more
wiley   +1 more source

Impact of Aerosols on Atmospheric Attenuation Loss in Central Receiver Systems: Preprint [PDF]

open access: yes, 2011
Atmospheric attenuation loss between the heliostat field and receiver has been recognized as a significant source of loss in Central Receiver Systems. In clear sky situations, extinction of Direct Normal Irradiance (DNI) is primarily by aerosols in the ...
Sengupta, M., Wagner, M. J.
core  

Evidence of long-term correlation between clear-air scintillation and attenuation in microwave and millimeter-wave satellite links

open access: yes, 1999
Long-term correlation between microwave scintillation and path attenuation in clear-air troposphere is quantitatively evaluated carrying out a numerical and experimental analysis on a monthly basis.
MARZANO, FRANK SILVIO   +3 more
core   +1 more source

Three‐dimensional geometric morphometric analysis of diaphragmatic dome motion in COPD patients

open access: yesThe Anatomical Record, EarlyView.
Abstract Diaphragmatic dysfunction is a hallmark of chronic obstructive pulmonary disease (COPD), especially in emphysema, where hyperinflation alters diaphragm geometry and impairs inspiratory mechanics. However, quantitative three‐dimensional (3D) assessments of diaphragmatic dome shape and motion across COPD phenotypes are limited.
José M. López‐Rey   +5 more
wiley   +1 more source

Precipitation Effects for Ka-band SAR

open access: yes, 2009
Space-borne Synthetic Aperture Radar (SAR) imaging is often considered to possess both day/night and all weather operational capabilities. Whereas the first argument is true since we are dealing with an active sensor; the second does not hold in cases ...
Chandra, Madhukar, Danklmayer, Andreas
core  

Prospecting of Architectural Features Using LiDAR‐UAV Technology, Deep Neural Networks and Visualization Techniques: A Case Study in Kuélap and Cambolín (NW Peru)

open access: yesArchaeological Prospection, EarlyView.
ABSTRACT High‐resolution and accurate synoptic images of terrestrial topography, even in densely forested areas, have proven valuable for archaeology by enabling the identification and characterization of relief patterns associated with ancient human activities. This study presents a novel approach that integrates digital terrain models (DTMs) obtained
Jhon A. Zabaleta‐Santisteban   +13 more
wiley   +1 more source

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