Results 21 to 30 of about 257,482 (231)

Intermediate Infrared Spectroscopy of Pyroxene: Determination of Ca‐Mg‐Fe Composition in the 4–8 Micron Wavelength Range

Earth and Space Science, 2023
Although pyroxene has been detected remotely across the Solar System, limited information is available from infrared remote sensing about the Mg‐Fe composition of pyroxene, and distinguishing between augite (20 < CaSiO3 < 45) and diopside‐hedenbergite ...
Christopher H. Kremer, John. F. Mustard, Carlé M. Pieters   +2 more
doaj   +1 more source

The Lyavaraka Ultrabasic Complex, Serpentinite Belt, Kola Peninsula, Russia

Geosciences, 2022
The Paleoproterozoic Lyavaraka ultrabasic complex is one of several dunite–harzburgite–orthopyroxenite bodies exposed as shallow plutonic complexes in the Serpentinite Belt, Kola Peninsula, Russia. Lyavaraka and the other complexes are anorogenic, formed
Andrei Y. Barkov, Andrey A. Nikiforov, Vladimir N. Korolyuk, Robert F. Martin   +3 more
doaj   +1 more source

Temperature-induced oligomerization of polycyclic aromatic hydrocarbons at ambient and high pressures

Scientific Reports, 2017
Temperature-induced oligomerization of polycyclic aromatic hydrocarbons (PAHs) was found at 500–773 K and ambient and high (3.5 GPa) pressures. The most intensive oligomerization at 1 bar and 3.5 GPa occurs at 740–823 K.
Artem D. Chanyshev, Konstantin D. Litasov, Yoshihiro Furukawa, Konstantin A. Kokh, Anton F. Shatskiy   +4 more
doaj   +1 more source

Diagnosis of Combination Faults in a Planetary Gearbox using a Modulation Signal Bispectrum based Sideband Estimator [PDF]

, 2015
This paper presents a novel method for diagnosing combination faults in planetary gearboxes. Vibration signals measured on the gearbox housing exhibit complicated characteristics because of multiple modulations of concurrent excitation sources, signal ...
Gu, Fengshou, Rehab, Ibrahim, Ball, Andrew, Abdallaa, Gaballa M., Tian, Xiange   +4 more
core   +4 more sources

ANTARCTICA: A TREASURE–TROVE FOR PLANETARY SCIENCES. AUSTRALASIAN MICROTEKTITES FROM EAST ANTARCTICA [PDF]

, 2020
The planetary science community has benefitted greatly from research in Antarctica. The discovery of large accumulations of meteorites in blue ice fields on the polar plateau since 1969 and of cosmic dust in Antarctic ice, snow and supraglacial moraines ...
Folco L
core  

Interpreting high-temperature magnetic susceptibility data of natural systems

Frontiers in Earth Science, 2023
High-temperature susceptibility (HT-χ) data are routinely measured in Earth, planetary, and environmental sciences to rapidly identify the magnetic mineralogy of natural systems. The interpretation of such data can be complicated.
Adrian R. Muxworthy, Adrian R. Muxworthy, Jack N. Turney, Liang Qi, Evelyn B. Baker, Joseph R. Perkins, Maryam A. Abdulkarim   +6 more
doaj   +1 more source

Geomorphology and Mineralogy of Belén Crater in Iani Chaos (Mars) Point to Hydrothermal Activity

The Planetary Science Journal
The study of Martian chaotic terrains helps constrain the ancient geologic history of the Martian water cycle, as these regions preserve geomorphic and mineralogical evidence of catastrophic groundwater release, subsurface ice melting, and associated ...
M. C. Rojas, M. Mantegazza, J. L. Bishop, M. G. Spagnuolo   +3 more
doaj   +1 more source

Resolving the biome debate: ecological and palaeo‐data concur that the extensive tree‐limited grassy biomes of central and north‐western Madagascar are largely anthropogenic

Biological Reviews, EarlyView.
ABSTRACT For millennia, human activities have transformed ecosystems globally. Determining which landscapes are predominantly anthropogenic is crucial to conservation and habitat restoration. Madagascar, a critically‐threatened biodiversity hotspot, is a prominent example.
Grant S. Joseph, Sean Hixon, Colleen L. Seymour, Laurie R. Godfrey, Miguel Pedrono, Karen E. Samonds, Andrinajoro R. Rakotoarivelo, Brooke E. Crowley   +7 more
wiley   +1 more source

Potential Subsurface Lava Tube Skylight on the Western Flank of Elysium Mons, Mars

The Astronomical Journal
The western flank of Elysium Mons, Mars, hosts a potential cave candidate (PCC) associated with a partially collapsed pit chain, previously identified in the Mars Cave Catalog.
Ravi Sharma, Chunyu Ding, Yan Su, Zhonghan Lei, Changzhi Jiang, Jiangwan Xu, YuXiao Zhi, Zihang Liang, Jiawei Li, Xiaohang Qiu, Haoyu Chen, S. N. A. Jaaffrey, (AAS Journals Data Editors)   +12 more
doaj   +1 more source

Micromechanical testing and property upscaling of planetary rocks: A critical review

International Journal of Mining Science and Technology
Knowledge of the mechanical behavior of planetary rocks is indispensable for space explorations. The scarcity of pristine samples and the irregular shapes of planetary meteorites make it difficult to obtain representative samples for conventional ...
Yiwei Liu, Guoping Zhang, Jiangmei Qiao, Xuhai Tang   +3 more
doaj   +1 more source