Results 61 to 70 of about 2,781,871 (195)

Retrieving water ice abundance in representative regions of the Moon’s South Pole using topography corrected SELENE MI images

Geoscience Letters
Previous studies have reported the existence of water ice in the lunar polar regions, but estimations of water ice using different methods vary in certainty, precision, location, and abundance.
Xindi Long, Chao Wang, Siji Sanlang, Yongjiu Feng, Xiong Xu, Huan Xie, Xiaohua Tong   +6 more
doaj   +1 more source

Deep space network energy program [PDF]

If the Deep Space Network is to exist in a cost effective and reliable manner in the next decade, the problems presented by international energy cost increases and energy availability must be addressed.
Friesema, S. E.
core   +1 more source

Numerical Simulations of the Lunar Penetrating Radar and Investigations of the Geological Structures of the Lunar Regolith Layer at the Chang’E 3 Landing Site

International Journal of Antennas and Propagation, 2017
In the process of lunar exploration, and specifically when studying lunar surface structure and thickness, the established lunar regolith model is usually a uniform and ideal structural model, which is not well-suited to describe the real structure of ...
Chunyu Ding, Yan Su, Shuguo Xing, Shun Dai, Yuan Xiao, Jianqing Feng, Danqing Liu, Chunlai Li   +7 more
doaj   +1 more source

Spaceport operations for deep space missions [PDF]

Space Station Freedom is designed with the capability to cost-effectively evolve into a transportation node which can support manned lunar and Mars missions.
Holt, Alan C.
core   +1 more source

Exploring Deep Space: Learning Personalized Ranking in a Semantic Space

, 2016
Recommender systems leverage both content and user interactions to generate recommendations that fit users' preferences. The recent surge of interest in deep learning presents new opportunities for exploiting these two sources of information.
Beyer K., Dai A. M., Le Q. V., Lowe W., Lowe W., Mikolov T., Rendle S., Yao W.   +7 more
core   +1 more source

The role of the deep space network's frequency and timing system in the detection of gravitational waves [PDF]

, 1982
A review of the Deep Space Network's (DSN) use of precision Doppler-tracking of deep space vehicles is presented. The review emphasizes operational and configurational aspects and considers: the projected configuration of the DSN's frequency and timing ...
Mankins, J. C.
core   +1 more source

Formation of Lunar Swirls: Implication from Derived Nanophase Iron Abundance

Remote Sensing
Lunar swirls are enigmatic features on the Moon’s surface, and their formation remains debated. Previous studies suggest that the distinctive spectral characteristics of lunar swirls result from the asymmetric space weathering between their bright ...
Wanqi Zhao, Xin Ren, Bin Liu, Yao Xiao, Dawei Liu   +4 more
doaj   +1 more source

Deep Learning in Target Space

, 2020
Deep learning uses neural networks which are parameterised by their weights. The neural networks are usually trained by tuning the weights to directly minimise a given loss function. In this paper we propose to re-parameterise the weights into targets for the firing strengths of the individual nodes in the network.
Fairbank, Michael, Samothrakis, Spyridon, Citi, Luca   +2 more
openaire   +3 more sources

DSN command system Mark III-80 [PDF]

The Deep Space Network command system configuration and functional operation are described. Voyager and Helios command operations are supported with Deep Space Station store and forward data handling; Viking and Pioneer are supported with the older, near
Thorman, H. C.
core   +1 more source

Were Gravity Waves or Lamb Waves Responsible for the Large‐Scale Thermospheric Response to the Tonga Eruption?

AGU Advances
The extraordinary eruption of the Tonga volcano on 15 January 2022 lofted material to heights exceeding 50 km, marking the highest observed since the satellite era.
Ruoxi Li, Jiuhou Lei, Shun‐Rong Zhang, Feifan Liu, Xuetao Chen, Xiaoli Luan, Xing Meng   +6 more
doaj   +1 more source