Results 21 to 30 of about 5,377,463 (329)

LEO satellite clock analysis and prediction for positioning applications

Geo-spatial Information Science, 2021
The positioning service aided by low Earth orbit (LEO) mega-constellations has become a hot topic in recent years. To achieve precise positioning, accuracy of the LEO clocks is important for single-receiver users. To bridge the gap between the applicable
Kan Wang, Ahmed El-Mowafy
doaj   +1 more source

Precise orbit determination for LEO satellites: single-receiver ambiguity resolution using GREAT products

Geo-spatial Information Science, 2022
In recent years, the large Low Earth Orbit (LEO) constellations have become a hot topic due to their great potential to improve the Global Navigation Satellite Systems (GNSS) positioning performance.
Xingxing Li, Yujie Qin, Keke Zhang, Jiaqi Wu, Wei Zhang, Qian Zhang, Hongmin Zhang   +6 more
doaj   +1 more source

Using Technology to Engage Students and Build Learning Communities to Inform Instructional Decisions [PDF]

Athens Journal of Education, 2014
Saint Leo University is a liberal arts university located in southwest Florida. University campus is a residential campus that teaches the traditional aged student.
Carol Todd, Victoria Anyikwa, Nancy Ryan, Patricia Tobin, Nancy Wood   +4 more
doaj   +1 more source

An optimal design of the broadcast ephemeris for LEO navigation augmentation systems

Geo-spatial Information Science, 2022
As the deployment of large Low Earth Orbiters (LEO) communication constellations, navigation from the LEO satellites becomes an emerging opportunity to enhance the existing satellite navigation systems.
Xueli Guo, Lei Wang, Wenju Fu, Yingbo Suo, Ruizhi Chen, Hongxing Sun   +5 more
doaj   +1 more source

Casinaria leo subsp. leo leo Maheshwary & Gupta 1977

, 2021
Casinaria leo leo Maheshwary & Gupta, 1977 Casinaria leo leo Maheshwary & Gupta, 1977: 164–165. Material examined. 1 female, Xizang, Linzhi, College of Agriculture and Animal Husbandry, 14.VII.2003, Deji Meiduo, No20035385. Distribution. China (Taiwan, Xizang); India.
Han, Yuan-Yuan, Achterberg, Kees Van, Chen, Xue-Xin   +2 more
openaire   +2 more sources

Leo V: A Companion of a Companion of the Milky Way Galaxy [PDF]

, 2008
We report the discovery of a new Milky Way dwarf spheroidal galaxy in the constellation of Leo identified in data from the Sloan Digital Sky Survey.
Adelman-McCarthy, Belokurov, Belokurov, Clem, D. B. Zucker, D. C. Faria, E. Olszewski, Evans, G. Gilmore, Gunn, Harbeck, Irwin, Koch, Koposov, Koposov, Lupton, M. G. Walker, M. J. Irwin, M. Mateo, Mateo, N. W. Evans, Ricotti, S. Koposov, Schlegel, Simon, Sirko, Smith, Tolstoy, V. Belokurov, Walker, Walsh, Willman, Zucker, Zucker   +33 more
core   +3 more sources

Holographic Metasurface-Based Beamforming for Multi-Altitude LEO Satellite Networks [PDF]

IEEE Transactions on Wireless Communications
Low Earth Orbit (LEO) satellite networks are capable of improving the global Internet service coverage. In this context, we propose a hybrid beamforming design for holographic metasurface based terrestrial users in multi-altitude LEO satellite networks ...
Qingchao Li, M. El-Hajjar, Kaijun Cao, Chao Xu, H. Haas, Lajos Hanzo   +5 more
semanticscholar   +1 more source

Metallicity Distribution Functions of Four Local Group dwarf galaxies [PDF]

, 2015
We present stellar metallicities in Leo I, Leo II, IC 1613, and Phoenix dwarf galaxies derived from medium (F390M) and broad (F555W, F814W) band photometry using the Wide Field Camera 3 (WFC3) instrument aboard the Hubble Space Telescope.
Anthony-Twarog, Barbara J., Holtzman, Jon A., Ross, Teresa L., Saha, Abhijit   +3 more
core   +3 more sources

The elusive old population of the dwarf spheroidal galaxy Leo I [PDF]

, 1999
We report the discovery of a significant old population in the dwarf spheroidal (dSph) galaxy Leo I as a result of a wide-area search with the ESO New Technology Telescope.
Bertelli G., Demers S., Demers S., E. V. Held, Ferraro F. R., G. Carraro, Held E. V., I. Saviane, Irwin M., Kaluzny J., Keane M., Lavery R. J., Y. Momany   +12 more
core   +2 more sources

Regularities of Changes in the Microhardness of Carbon Steels during Gas Laser Cutting [PDF]

MATEC Web of Conferences, 2021
The paper considers the regularities of changes in the microhardness of carbon steels during gas-laser cutting. Quantitative numerical estimates of the extent of the gas-laser thermal influence zone are made.
Minaev Igor V., Ageev Evgeny V., Kutepov Sergey N., Gvozdev Alexander E.   +3 more
doaj   +1 more source