Results 21 to 30 of about 36,199 (290)

Optical Clocks in Space [PDF]

, 2006
The performance of optical clocks has strongly progressed in recent years, and accuracies and instabilities of 1 part in 10^18 are expected in the near future.
Ertmer, W., Gill, P., Goerlitz, A., Haensch, T. W., Holzwarth, R., Klein, H. A., Klein, V., Koelemeij, J. C. J., Lemonde, P., Margolis, H. S., Mileti, G., Nevsky, A., Peik, E., Rasel, E., Riehle, F., Salomon, C., Schiller, S., Sterr, U., Tamm, Chr., Tino, G. M., Wicht, A.   +20 more
core   +4 more sources

Study on the Space Geodesy

Highlights in Science, Engineering and Technology, 2023
Geodesic is a kind of shortest path among all curves in a metric space, which originally appeared in the Gaussian period. Since then, it was extensively applied in various branches of mathematics and physics, such as Riemannian geometry, digital geometry, Einstein’s relativity, etc.
openaire   +1 more source

Fracture behaviour of alloys for a new laser ranged satellite [PDF]

, 2018
A new laser-ranged satellite called LARES 2 (Laser Relativity Satellite 2) has been recently designed for accurate tests of Einsten's theory of General Relativity and space geodesy.
Brotzu, A., Ciufolini, I., Felli, F., Paolozzi, A., Pilone, D.   +4 more
core   +1 more source

SAR Ship–Iceberg Discrimination in Arctic Conditions Using Deep Learning

Remote Sensing, 2022
Maritime surveillance of the Arctic region is of growing importance as shipping, fishing and tourism are increasing due to the sea ice retreat caused by global warming. Ships that do not identify themselves with a transponder system, so-called dark ships,
Peder Heiselberg, Kristian A. Sørensen, Henning Heiselberg, Ole B. Andersen   +3 more
doaj   +1 more source

GPS supported assessment integrated with GIS service area analysis of healthcare institutions of Basona Werana in comparison with Debre Berhan

Geodesy and Cartography, 2022
The study is principally aimed to assess and analyse the spatial location of the health institutions from lowerlevel Health Posts (HPs) to higher level Referral Hospitals (RHs) in both Zonal Capital Debre Berhan Town (DBT) and the surrounding Rural ...
Wondwossen Mindahun, Natnael Agegnehu, Andnet Nigussie   +2 more
doaj   +1 more source

On the eve of the 100th anniversary of IAU Commission 19/A2 “Rotation of the Earth” [PDF]

, 2018
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence
Brzeziński, Aleksander, Capitaine, Nicole, Dehant, Véronique, Gross, Richard, Huang, Chengli, Malkin, Zinovy, McCarthy, Dennis, Schuh, Harald, Vondrák, Jan, Yatskiv, Yaroslav   +9 more
core   +1 more source

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

Estimating integrated water vapor trends from VLBI, GPS,and numerical weather models: sensitivity totropospheric parameterization [PDF]

, 2018
©2018. American Geophysical UnionIn this study, we estimate integrated water vapor (IWV) trends from very long baseline interferometry (VLBI) and global navigation satellite systems (GNSS) data analysis, as well as from numerical weather models (NWMs ...
Balidakis, Kyriakos, Deng, Zhiguo, Glaser, Susanne, Heinkelmann, Robert, Nilsson, Tobias, Schuh, Harald, Zus, Florian   +6 more
core   +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

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