Results 21 to 30 of about 2,867 (260)

Development of Ionospheric Tomography Model Using GPS [PDF]

Journal of Astronomy and Space Sciences, 2006
We produced the electron density distribution in the ionosphere over South Korea using the data from nine permanent GPS (Global Positioning System) stations which have been operated by KASI (Korea Astronomy and Space Science Institute).
Byung-Kyu Choi, Jong-Uk Park, Sang-Jeong Lee   +2 more
doaj   +1 more source

Recent Advances in Modelling Geodetic Time Series and Applications for Earth Science and Environmental Monitoring

Remote Sensing, 2022
Geodesy is the science of accurately measuring the topography of the earth (geometric shape and size), its orientation in space, and its gravity field.
Xiaoxing He, Jean-Philippe Montillet, Zhao Li, Gaël Kermarrec, Rui Fernandes, Feng Zhou   +5 more
doaj   +1 more source

Cold Atom Interferometry for Enhancing the Radio Science Gravity Experiment: A Phobos Case Study

Remote Sensing, 2022
Interplanetary missions have typically relied on Radio Science (RS) to recover gravity fields by detecting their signatures on the spacecraft trajectory.
Michael Plumaris, Dominic Dirkx, Christian Siemes, Olivier Carraz   +3 more
doaj   +1 more source

The Greenland GNSS Network (GNET): geodetic grade GNSS measurements of Greenland's 3D bedrock displacement from 1995–2025 [PDF]

Earth System Science Data
The Greenland GNSS Network (GNET) consists of 71 individual geodetic-grade Global Navigation Satellite Systems (GNSS) stations mounted directly in bedrock located along the perimeter of the Greenland Ice Sheet (GrIS). The first continuously running GNSS (
C. Solgaard, F. B. Madsen, M. Winther-Dahl, T. H. Nylen, D. Longfors Berg, O. Bjerregaard, J. Hassan, P. Knudsen, M. Bevis, S. A. Khan   +9 more
doaj   +1 more source

A Study on the Deriving Requirements of ARGO Operation System [PDF]

Journal of Astronomy and Space Sciences, 2009
Korea Astronomy and Space Science Institute (KASI) has been developing one mobile and one stationary SLR system since 2008 named as ARGO-M and ARGO-F, respectively. KASI finished the step of deriving the system requirements of ARGO.
Yoon-Kyung Seo, Dong-Young Rew, Hyung-Chul Lim, In-Kwan Park, Hong-Suh Yim, Jung Hyun Jo, Jong-Uk Park   +6 more
doaj   +1 more source

Advancing Age Modulates Associations Between Cognitive Impairment and Brain Volumes in Early MS

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Introduction Cognitive impairment is common in multiple sclerosis (MS), but manifestations following the first demyelinating event are relatively unexplored. We investigated cross‐sectional associations between magnetic resonance imaging (MRI)–derived brain volumes and the presence of cognitive impairment outcomes five years after the first ...
Piriyankan Ananthavarathan, Marco Pitteri, Michael Foster, Sara Collorone, Sara Salama, Elisa Colato, Ferran Prados, Baris Kanber, Marios Yiannakas, Claudia A. M. Gandini Wheeler‐Kingshott, Indran Davagnanam, Frederik Barkhof, Declan Chard, Olga Ciccarelli, Ahmed Toosy   +14 more
wiley   +1 more source

Thermosphere model assessment for geomagnetic storms from 2001 to 2023

Journal of Space Weather and Space Climate
We present an updated study for thermosphere model assessment under geomagnetic storm conditions, defined when the geomagnetic index ap = 80 or larger.
Bruinsma Sean, Laurens Sophie
doaj   +1 more source

Mapping Vertical Land Motion in Challenging Terrain: Six‐Year Trends on Tutuila Island, American Samoa, With PS‐InSAR, GPS, Tide Gauge, and Satellite Altimetry Data

Geophysical Research Letters, 2022
Sea level rise is a major challenge facing coastlines worldwide and can be strongly exacerbated by land subsidence. However, detailed characterization of vertical land motion (VLM) is limited for many tectonically active islands, as many remote sensing ...
Stacey A. Huang, Jeanne M. Sauber, Richard Ray   +2 more
doaj   +1 more source

Characterization of Carrier Phase-Based Positioning in Real-World Jamming Conditions

Remote Sensing, 2021
GNSS signals arriving at receivers at the surface of the Earth are weak and easily susceptible to interference and jamming. In this paper, the impact of jamming on the reference station in carrier phase-based relative baseline solutions is examined ...
Søren Skaarup Larsen, Anna B. O. Jensen, Daniel H. Olesen   +2 more
doaj   +1 more source

A Lightweight, 3D‐Printable, Low‐Cost, “One‐Click” Dorsal Skin Window for High‐Quality Long‐Term Multimodal Subcutaneous Tumor Imaging

Advanced Healthcare Materials, EarlyView.
An innovative, lightweight 3D‐printed skinfold chamber system is presented for long‐term intravital imaging. This affordable, biocompatible platform simplifies surgical implantation and allows high‐resolution, multimodal visualization of the tumor microenvironment for up to four weeks.
Iván Cortés Domínguez, Xabier Morales Urteaga, Maider Esparza, Lucía Grande, Ainhoa Urbiola, Cristina Ederra, Tomas Muñoz Santoro, Beatrice Pinci, Alvaro Teijeira, Carlos Ortiz de Solórzano   +9 more
wiley   +1 more source