Results 81 to 90 of about 76,454 (246)

Review for the Design and Experimental Study of a Coaxial Twin-rotor Mars Unmanned Aerial Vehicle

Space: Science & Technology
The thin atmosphere of Mars presents a necessary yet challenging flight environment for low-altitude flying vehicles or unmanned aerial vehicles. As a key technology, Martian unmanned aerial vehicles hold marked value and importance for scientific ...
Zhifang Ke, Yu Hu, Qingkai Meng, Yongjie Shu, Jinghan Tu, Molei Zhao, Shiyi Wei, Haitao Zhang, Bin Xu, Zhaopu Yao, Wei Wei   +10 more
doaj   +1 more source

Semantic Segmentation of Martian Landforms with Sparse Scribble Annotations Using a Pseudo-Labeling Strategy [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Deep learning-based semantic segmentation techniques play a crucial role in the rapid mapping of Martian landforms. However, creating an annotated dataset for Martian landforms is a labor-intensive and time-consuming process.
P. Ye, P. Ye, R. Huang, R. Huang, P. Wang, Y. Xu, Y. Xu, Z. Ye, Z. Ye, Y. Feng, Y. Feng, X. Tong, X. Tong   +12 more
doaj   +1 more source

Observations of Locally Generated Whistler-mode Waves in the Martian Magnetotail Current Sheet

The Astrophysical Journal, 2023
The whistler-mode wave is an electromagnetic wave that commonly occurs in space plasma and has been extensively studied, especially within the Earth's magnetosphere. They have also been reported in the near-Mars space, such as Martian upstream solar wind,
Xiao Ma, Anmin Tian, Shichen Bai, Ruilong Guo, Quanqi Shi, Mengmeng Wang, Xiaochen Shen   +6 more
doaj   +1 more source

Evaluating Investment in Space Programs: A Case for Theoretical Pluralism

Financial Accountability &Management, EarlyView.
ABSTRACT A perennial question repeatedly asked since the early Mercury (USA) and Salyut (then Soviet Union) space programs has been variations on the theme of “how can the cost of space exploration be justified?” This question—which in broad terms constitutes the research question considered in this paper—continues to be directed toward space agencies ...
Basil P. Tucker, Hank C. Alewine
wiley   +1 more source

Constructing citizenship and indigeneity in Jordan: The politics of Bedouin rights and identities in cultural heritage sites

The Geographical Journal, EarlyView.
Short Abstract This paper explores the relationships between Bedouin rights, citizenship and indigeneity in cultural heritage sites in Jordan. Through interviews and ethnographic fieldwork with Bedouin communities, we argue that a more critical engagement with indigeneity is necessary in Jordan.
Taraf Abu Hamdan, Olivia Mason
wiley   +1 more source

CONCEPŢIA FILOSOFICĂ DESPRE STAT ŞI DREPT A LUI VASILE GOLDIŞ

EIRP Proceedings, 2007
Being a part of a philosophic common conception, of an original way of interpretinggreat trends of the European history the judicial philosophy seen by Vasile Goldiş speaksabout values, principles and arguments which guided his entire political career ...
Martian Iovan
doaj  

Chalcophile Element Constraints on the Sulfur Content of the Martian Mantle [PDF]

The sulfur content of the Martian mantle is critical to understanding volcanic volatiles supplied to the surface of Mars and possibly climate. In the absence of Martian mantle rocks, sulfur content of the mantle has been inferred from S contents of ...
Hewins, R. H., Humayun, M., Irving, A. J., Righter, K., Yang, S., Zanda, B.   +5 more
core   +1 more source

Comparison of Two Methods for Determination of Rhenium and Platinum‐Group Elements in Meteorites Using On‐Line and Off‐Line Matrix Separation Modes

Geostandards and Geoanalytical Research, EarlyView.
Key Points PEEK tubing has been observed to adsorb Pd and Pt ions, resulting in significantly reduced recoveries of Pd and Pt elements. HPA‐S provides a more effective dissolution for meteorite samples than Carius tube digestion, resulting in higher mass fractions for PGE.
Yuling Zeng, Guiqin Wang, Thomas C. Meisel   +2 more
wiley   +1 more source

The depth of the convective boundary layer and implications for a Walker-like circulation on Mars [PDF]

, 2011
Radio science observations indicate that the depth of the martian convective boundary layer varies strongly with surface height, although the surface temperature does not.
Hinson, D. P., Lewis, S. R., Spiga, A.
core  

The nature and formation of silica minerals in eucrite meteorites: Insight into the protoplanetary magma crystallization

Meteoritics &Planetary Science, EarlyView.
Abstract Silica polymorphs in meteorites provide critical constraints on crystallization processes associated with thermal activity in the early solar system. A detailed investigation of silica polymorphs in eucrites (the largest group of achondrites) using cathodoluminescence imaging and laser‐Raman spectroscopy revealed significant variations in the ...
Rei Kanemaru, Akira Yamaguchi, Naoya Imae, Ryoga Maeda, Makoto Kimura, Kenji Horie, Takashi Mikouchi, Masaaki Miyahara, Masahiro Yasutake, Atsushi Takenouchi, Haruka Ono, Aiko Nakato, Junko Isa, Tomohiro Usui, Hirotsugu Nishido   +14 more
wiley   +1 more source