Results 11 to 20 of about 2,706,812 (338)

Visibility analysis of Phobos to support a science and exploration platform

Earth, Planets and Space, 2021
The surfaces of the Martian moons, Phobos and Deimos may offer a stable environment for long-term operation of platforms. We present a broad assessment of potential scientific investigations, as well as strategic and operational opportunities offered by ...
Elliot Sefton-Nash, Guillaume Thébault, Olivier Witasse, Detlef Koschny, Beatriz Sánchez-Cano, Alejandro Cardesín-Moinelo   +5 more
doaj   +1 more source

Review of Key Technologies of Rotary-Wing Mars UAVs for Mars Exploration

Inventions, 2023
The sparse atmosphere on the surface of Mars provides the necessary flight conditions for Mars unmanned aerial vehicles (UAVs) to perform low-altitude flights.
Pengyue Zhao, Ruihan Li, Peng Wu, Huan Liu, Xifeng Gao, Zongquan Deng   +5 more
doaj   +1 more source

The future lifespan of Earth's oxygenated Atmosphere [PDF]

, 2021
Earth's modern atmosphere is highly oxygenated and is a remotely detectable signal of its surface biosphere. However, the lifespan of oxygen-based biosignatures in Earth's atmosphere remains uncertain, particularly for the distant future. Here we use a combined biogeochemistry and climate model to examine the likely timescale of oxygen-rich atmospheric
arxiv   +1 more source

Accuracy of patient dose estimation in cone beam computed tomography in breast irradiation by size‐specific dose estimates with position correction

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract This study aims to investigate the effects of the position correction of size‐specific dose estimates (SSDE) on patient dose estimation in cone beam computed tomography (CBCT). The relationship between the phantom position and absorbed dose in the right breast was studied using optically stimulated luminescence dosimeters and a simulated human
Hiroyuki Ueno, Kosuke Matsubara, Sayuri Bou, Masato Hizume   +3 more
wiley   +1 more source

Early‐onset Alzheimer's disease shows a distinct neuropsychological profile and more aggressive trajectories of cognitive decline than late‐onset

Annals of Clinical and Translational Neurology, Volume 9, Issue 12, Page 1962-1973, December 2022., 2022
Abstract Objectives Early‐ and late‐onset Alzheimer's disease (EOAD and LOAD) share the same neuropathological traits but show distinct cognitive features. We aimed to explore baseline and longitudinal outcomes of global and domain‐specific cognitive function in a well characterized cohort of patients with a biomarker‐based diagnosis.
Adrià Tort‐Merino, Neus Falgàs, Isabel E. Allen, Mircea Balasa, Jaume Olives, José Contador, Magdalena Castellví, Jordi Juncà‐Parella, Núria Guillén, Sergi Borrego‐Écija, Bea Bosch, Guadalupe Fernández‐Villullas, Oscar Ramos‐Campoy, Anna Antonell, Lorena Rami, Raquel Sánchez‐Valle, Albert Lladó   +16 more
wiley   +1 more source

Study on Effect of Aerodynamic Configuration on Aerodynamic Performance of Mars Ascent Vehicles

Space: Science & Technology, 2022
The Mars surface take-off and ascent technology is one of the key technologies for realizing the Mars sample return mission. Different from that on the moon, the gravity acceleration on the surface of Mars is 3.71 m/s2, so that the gravity loss is larger
Qi Li, Wu Yuan, Rui Zhao, Haogong Wei
doaj   +1 more source

Detection of Martian dust storms using mask regional convolutional neural networks

Progress in Earth and Planetary Science, 2022
Martian dust plays a crucial role in the meteorology and climate of the Martian atmosphere. It heats the atmosphere, enhances the atmospheric general circulation, and affects spacecraft instruments and operations.
Rasha Alshehhi, Claus Gebhardt
doaj   +1 more source

Brief communication: Lower-bound estimates for residence time of energy in the atmospheres of Venus, Mars and Titan [PDF]

Nonlinear Processes in Geophysics, 2021
The residence time of energy in a planetary atmosphere, τ, which was recently introduced and computed for the Earth's atmosphere (Osácar et al., 2020), is here extended to the atmospheres of Venus, Mars and Titan.
J. Pelegrina, C. Osácar, A. Fernández-Pacheco   +2 more
doaj   +1 more source

Smaller Sensitivity of Precipitation to Surface Temperature under Massive Atmospheres [PDF]

, 2022
Precipitation and its response to forcings is an important aspect of planetary climate system. In this study, we examine the strength of precipitation in the experiments with different atmospheric masses and their response to surface warming, using three global atmospheric general circulation models (GCMs) and one regional cloud-resolving model (CRM ...
arxiv   +1 more source

The Atmospheres of Mars and Venus [PDF]

Annual Review of Astronomy and Astrophysics, 1971
Of all the planets which may exist in the Universe, only nine have been studied by man. As a result, one cannot classify planets with the same confidence that one has in classifying stars; there is no theory of planetary evolution comparable in development to the theory of stellar evolution.
Ingersoll, Andrew P., Leovy­, Conway B.
openaire   +4 more sources