Results 21 to 30 of about 85,212 (150)

Cosmic jets [PDF]

Physics Letters A, 2011
We discuss time-dependent gravitational fields that "accelerate" free test particles to the speed of light resulting in cosmic double-jet configurations. It turns out that complete gravitational collapse along a spatial axis together with corresponding expansion along the other two axes leads to the accelerated motion of free test particles up and down
Chicone, C., Mashhoon, B., Rosquist, K.
openaire   +3 more sources

Global Maps of Equatorial Plasma Bubbles Depletions Based on FORMOSAT‐7/COSMIC‐2 Ion Velocity Meter Plasma Density Observations

Space Weather, 2023
FORMOSAT‐7/COSMIC‐2 is the largest equatorial multi‐satellite constellation of six full‐size satellites to study the equatorial ionosphere. Each satellite is equipped by an ion velocity meter (IVM) instrument to provide high rate in situ plasma density ...
Irina Zakharenkova, Iurii Cherniak, John J. Braun, Qian Wu   +3 more
doaj   +1 more source

Cosmic dimensions

Topology and its Applications, 2007
2005-11-15: new version, largely ...
Dow, A. (author), Hart, K.P. (author)
openaire   +4 more sources

Comparison and Validation of the Ionospheric Climatological Morphology of FY3C/GNOS with COSMIC during the Recent Low Solar Activity Period

Remote Sensing, 2019
With the accumulation of the ionospheric radio occultation (IRO) data observed by Global Navigation Satellite System (GNSS) occultation sounder (GNOS) onboard FengYun-3C (FY3C) satellite, it is possible to use GNOS IRO data for ionospheric climatology ...
Weihua Bai, Guangyuan Tan, Yueqiang Sun, Junming Xia, Cheng Cheng, Qifei Du, Xianyi Wang, Guanglin Yang, Mi Liao, Yan Liu, Xiangguang Meng, Danyang Zhao, Congliang Liu, Yuerong Cai, Dongwei Wang, Yingqiang Wang, Cong Yin, Peng Hu, Ziyan Liu   +18 more
doaj   +1 more source

Development and preliminary validation of a machine learning system for thyroid dysfunction diagnosis based on routine laboratory tests

Communications Medicine, 2022
Hu et al. develop a machine learning approach for diagnosis of thyroid disorders based on routine clinical laboratory measurements. The approach is tested on data from multiple institutions and can distinguish patients with hyper- or hypothyroidism from ...
Min Hu, Chikashi Asami, Hiroshi Iwakura, Yasuyo Nakajima, Ryousuke Sema, Tsuyoshi Kikuchi, Tsuyoshi Miyata, Koji Sakamaki, Takumi Kudo, Masanobu Yamada, Takashi Akamizu, Yasubumi Sakakibara   +11 more
doaj   +1 more source

Cosmic rulers [PDF]

Physical Review D, 2012
We derive general covariant expressions for the six independent observable modes of distortion of ideal standard rulers in a perturbed Friedmann-Robertson-Walker spacetime. Our expressions are gauge-invariant and valid on the full sky. These six modes are most naturally classified in terms of their rotational properties on the sphere, yielding two ...
Schmidt, Fabian, Jeong, Donghui
openaire   +3 more sources

Statistical validation of ionospheric electron density profiles retrievals from GOES geosynchronous satellites

Journal of Space Weather and Space Climate, 2023
In this paper, we discuss a novel retrieval of ionospheric electron density profiles using the Radio Occultation (RO) technique applied to measurements captured by the Global Positioning System (GPS) receivers onboard two Geostationary Operational ...
Zakharenkova Irina, Cherniak Iurii, Gleason Scott, Hunt Douglas, Freesland Douglas, Krimchansky Alexander, McCorkel Joel, Ramsey Graeme, Chapel Jim   +8 more
doaj   +1 more source

Design and operation of a 1500-m laser strainmeter installed at an underground site in Kamioka, Japan

Earth, Planets and Space, 2017
A laser strainmeter with a 1500-m baseline was constructed at an underground site in Kamioka, Gifu Prefecture, Japan, and has been operating since August 2016. The laser interferometer measures the change in distance between two retroreflectors housed in
Akito Araya, Akiteru Takamori, Wataru Morii, Kouseki Miyo, Masatake Ohashi, Kazuhiro Hayama, Takashi Uchiyama, Shinji Miyoki, Yoshio Saito   +8 more
doaj   +1 more source

COSMIC‐2 Radio Occultation Constellation: First Results

Geophysical Research Letters, 2020
Initial data from the Formosa Satellite‐7/Constellation Observing System for Meteorology Ionosphere and Climate (FORMOSAT‐7/COSMIC‐2, hereafter C2), a recently launched equatorial constellation of six satellites carrying advanced radio occultation ...
W.S. Schreiner, J.P. Weiss, R.A. Anthes, J. Braun, V. Chu, J. Fong, D. Hunt, Y.‐H. Kuo, T. Meehan, W. Serafino, J. Sjoberg, S. Sokolovskiy, E. Talaat, T.K. Wee, Z. Zeng   +14 more
doaj   +1 more source

Evaluation of Tropospheric Moisture Characteristics Among COSMIC-2, ERA5 and MERRA-2 in the Tropics and Subtropics

Remote Sensing, 2021
Global navigation satellite system (GNSS) radio occultation (RO) receivers onboard the recently-launched COSMIC-2 (C2) satellite constellation provide an unprecedented number of high vertical resolution moisture profiles throughout the tropical and ...
Benjamin R. Johnston, William J. Randel, Jeremiah P. Sjoberg   +2 more
doaj   +1 more source