Results 21 to 30 of about 376 (139)

Household economic impact of HIV-associated cryptococcal meningitis in five countries in Southern and Eastern Africa. [PDF]

J Int AIDS Soc
Abstract Introduction HIV‐associated cryptococcal meningitis is the second leading cause of AIDS‐related mortality. Cryptococcal meningitis is a poverty‐related disease and the majority of cases occur in settings where resources are limited and access to quality care is often linked to an individual's ability to pay for services.
Lawrence DS, Muthoga C, Adams J, Ndweni AB, Boulware DR, Chawinga C, Comins K, Dziwani EN, Hlupeni A, Hosseinipour MC, Jjunju S, Kanyama C, Leeme TB, Meintjes G, Meya DB, Mosepele M, Moyo M, Mwandumba HC, Muzoora C, Ndhlovu CE, Nuwagira E, Schutz C, Tugume L, Williams D, Molloy SF, Boyer-Chammard T, Youssouf N, Jaffar S, Niessen LW, Harrison TS, Cunnama L, Jarvis JN, AMBITION Study Group.   +32 more
europepmc   +2 more sources

GNSS Meteorology for Disastrous Rainfalls in 2017–2019 Summer in SW Japan: A New Approach Utilizing Atmospheric Delay Gradients

Frontiers in Earth Science, 2020
We studied disastrous heavy rainfall episodes in 2017–2019 summer in SW Japan, especially in the Kyushu region using tropospheric delay data from the Japanese dense global navigation satellite system (GNSS) network GEONET (GNSS Earth Observation Network).
Syachrul Arief, Syachrul Arief, Kosuke Heki   +2 more
doaj   +1 more source

Assessing ZWD models in delay and height domains using data from stations in different climate regions

Applied Geomatics, 2022
Global Navigation Satellite System (GNSS) has revolutionized activities involving geodetic positioning. To achieve a desired accuracy, it is essential to model the atmosphere in an appropriate way. With respect to the neutral atmosphere, the signal sent by the satellite suffers a delay when crossing this layer during its travel to the receiver on the ...
Thainara Munhoz Alexandre de Lima, Marcelo Santos, Daniele Barroca Marra Alves, Thalia Nikolaidou, Tayná Aparecida Ferreira Gouveia   +4 more
openaire   +2 more sources

A Regional Model for Predicting Tropospheric Delay and Weighted Mean Temperature in China Based on GRAPES_MESO Forecasting Products

Remote Sensing, 2021
Accurate tropospheric delay (TD) and weighted mean temperature (Tm) are important for Global Navigation Satellite System (GNSS) positioning and GNSS meteorology.
Liying Cao, Bao Zhang, Junyu Li, Yibin Yao, Lilong Liu, Qishun Ran, Zhaohui Xiong   +6 more
doaj   +1 more source

Using GNSS Observations for Tropospheric Delay Prediction Using Artificial Intelligence [PDF]

Port Said Engineering Research Journal, 2023
GNSS technology holds significant importance across wide applications, ranging from mapping, surveying, and precise timekeeping to ship navigation. Its operational principle hinges on the accurate measurement of signal travel time, which is crucial for ...
Ahmed Sedeek
doaj   +1 more source

Applying the Water Vapor Radiometer to Verify the Precipitable Water Vapor Measured by GPS

Terrestrial, Atmospheric and Oceanic Sciences, 2014
Taiwan is located at the land-sea interface in a subtropical region. Because the climate is warm and moist year round, there is a large and highly variable amount of water vapor in the atmosphere.
Ta-Kang Yeh, Jing-Shan Hong, Chuan-Sheng Wang, Tung-Yuan Hsiao, Chin-Tzu Fong   +4 more
doaj   +1 more source

Comprehensive Study on the Tropospheric Wet Delay and Horizontal Gradients during a Severe Weather Event

Remote Sensing, 2022
GNSS meteorology is today one of the most growing technologies to monitor severe weather events. In this paper, we present the usage of 160 GPS reference stations over the period of 14 days to monitor and track Hurricane Harvey, which struck Texas in ...
Victoria Graffigna, Manuel Hernández-Pajares, Francisco Azpilicueta, Mauricio Gende   +3 more
doaj   +1 more source

THUNDERSTORM WEATHER ANALYSIS BASED ON XGBOOST ALGORITHM [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2020
Using the GPS data service platform of China seismological bureau to get the ZTD separated ZWD data pair and the content in the air, and by detecting the O3 value in the air is an effective method to analyze and study the thunderstorm weather.This paper ...
L. L. Liu, H. C. Liu, C. F. Zhu
doaj   +1 more source

REAL-TIME TROPOSPHERIC PRODUCT ESTABLISHMENT AND ACCURACY ASSESSMENT IN CHINA [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2018
Tropospheric delay has always been an important issue in Global Navigation Satellite System (GNSS) processing. Empirical tropospheric delay models are difficult to simulate complex and volatile atmospheric environments, resulting in poor accuracy of the ...
M. Chen, M. Chen, M. Chen, J. Guo, J. Wu, J. Wu, W. Song, W. Song, D. Zhang, D. Zhang   +9 more
doaj   +1 more source

Analysis on the Applicability of a K-value Model Used for Water Vapor Conversion in Western China [PDF]

E3S Web of Conferences, 2020
This paper makes use of the sounding data of 43 sounding stations located in western China from 2016 to 2019 and takes the PWV-ZWD (precipitable water vapor and Zenith wet delay) conversion coefficient K calculated via numerical integration as the ...
Yao Maohua, Zhou Wenting, Chen Xiangping
doaj   +1 more source