Results 41 to 50 of about 2,940 (206)

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

open access: yesInternational 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   +7 more
doaj   +1 more source

Rearrangement Towards Stability: Plastic Shakedown in Granular Materials Under Thermal Cycles

open access: yesInternational Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.
ABSTRACT Granular materials are routinely subjected to thermal cycling due to natural and anthropogenic phenomena. Despite the ubiquity of this occurrence and its relevance for science, engineering, and technology, the long‐term thermo‐mechanical response of granular materials to repeated heating and cooling remains poorly understood.
Naghmeh Mehraeen   +1 more
wiley   +1 more source

A microphysical thermal model for the lunar regolith: Determining the lunar regolith properties using a combination of LRO/Diviner and Chang’E-2/MRM data

open access: yesAstronomy & Astrophysics
Context. The surface of the Moon is covered by regolith and its microphysical structure is not only linked to surface processes and regolith evolution, but is also important for in situ resource utilization and mission planning. Aims.
Bürger Johanna   +3 more
doaj   +1 more source

An Open Database of Lunar Regolith and Simulants Properties

open access: yesInternational Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.
ABSTRACT Lunar regolith, the layer of unconsolidated material covering the Moon's surface, is central to the science and technology developed for the Moon, notably related to in‐situ science investigations, resource utilization, surface infrastructure, and mobility systems.
Léonie Gasteiner   +2 more
wiley   +1 more source

Lunar regolith simulations with discrete element method based on Chang'E-5 mission's lunar soil particle morphology

open access: yesYantu gongcheng xuebao
To align with the current strategic planning of "survey, mining, and development" in China's lunar exploration mission, and to obtain more accurate physical and mechanical properties of lunar regolith, this study focuses on the influences of lunar ...
WANG Siyuan 1, , JIANG Mingjing 2, 3, 4
doaj   +1 more source

Development of a Hydrogeological Conceptual Model for Shallow Aquifers in the Data Scarce Upper Blue Nile Basin

open access: yesHydrology, 2019
Rural communities in sub-Saharan Africa commonly rely on shallow hand-dug wells and springs; consequently, shallow aquifers are an extremely important water source.
David Walker   +3 more
doaj   +1 more source

Particle‐Scale Mechanics of a Regolith‐Type Soil

open access: yesInternational Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.
ABSTRACT The existing studies have reported that the surface of Mars shows the presence of materials having igneous origin, including basalt and regolith‐type coarse soils. These findings are affected by significant uncertainties and, therefore, the selection of simulants for various exploration applications, including surface mobility of rovers ...
Vincenzo Nardelli   +2 more
wiley   +1 more source

Evaluating the Depth–Age Hypothesis for the Evolution of the Lunar Regolith

open access: yesThe Planetary Science Journal
Lunar regolith is the fractured rock layer covering most of the lunar surface. This rock is fractured into regolith primarily by repeated meteorite impacts over eons.
Gwendolyn D. Bart
doaj   +1 more source

Interplanetary frontiers: terraforming from an invasion science perspective

open access: yesOikos, EarlyView.
The pursuit of a multi‐planetary existence represents one of humanity's greatest frontiers. If applied justly, it offers an opportunity to extend its civilization's lifespan amid escalating sustainability crises on Earth. One approach increasingly gaining traction is terraforming, a hitherto theoretical ecological and evolutionary experiment revolving ...
Teun Everts   +2 more
wiley   +1 more source

Effects of Low-Temperature Plasma-Sterilization on Mars Analog Soil Samples Mixed with Deinococcus radiodurans

open access: yesLife, 2016
We used Ar plasma-sterilization at a temperature below 80 °C to examine its effects on the viability of microorganisms when intermixed with tested soil.
Janosch Schirmack   +3 more
doaj   +1 more source

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