Article
Geosciences, Multidisciplinary
Zongbo Xu, Adrien Broquet, Nobuaki Fuji, Taichi Kawamura, Philippe Lognonne, Jean-Paul Montagner, Lu Pan, Martin Schimmel, Eleonore Stutzmann, William Bruce Banerdt
Summary: Understanding the Martian crust and uppermost mantle is crucial for studying the planet's evolution, and NASA's InSight mission has provided seismic data to reveal the interior structure. While most studies have focused on the crustal structure beneath the InSight lander, the seismic structure of other regions remains poorly known. This study investigates the crustal structure along the Medusa Fossae Formation and the dichotomy using surface-wave data, and the findings suggest the presence of a high-velocity layer and a common intra-crustal structure in this region.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Astronomy & Astrophysics
Harry A. Ballantyne, Martin Jutzi, Gregor J. Golabek, Lokesh Mishra, Kar Wai Cheng, Antoine B. Rozel, Paul J. Tackley
Summary: A giant impact is suggested as the explanation for the Martian Dichotomy, with recent studies favoring a hybrid origin caused by impact-induced crust-production. This study uses a large suite of impact simulations and a sophisticated geophysical scheme to investigate the feasibility of a giant impact on either hemisphere of Mars. The results suggest that a cannonical Borealis-forming impact is not possible, but instead favor an impact and subsequent localised magma ocean in the southern hemisphere that results in a thicker crust than the north.
Article
Geochemistry & Geophysics
Valentin Bonnet Gibet, Chloe Michaut, Mark Wieczorek, Philippe Lognonne
Summary: A North/South difference in crustal thickness is likely at the origin of the Martian dichotomy in topography. This difference may be caused by a positive feedback between crustal growth and mantle melting.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Article
Geology
Steven J. Jaret, E. Troy Rasbury, Peter Reiners, John G. Spray, Lucy M. Thompson, Sidney R. Hemming, Michelle S. Thompson
Summary: Lead isotope ratios in feldspar grains from impact melt rocks in Canada's Manicouagan and Sudbury impact structures show extreme variations, indicating significant heterogeneity at the millimeter scale. The individual lead isotope ratios of feldspars in Martian shergottites also exhibit a wider range, similar to terrestrial impact melt sheets rather than non-impact igneous rocks. This suggests that some Martian shergottites may have crystallized from impact melt sheets rather than volcanic sources.
Article
Geochemistry & Geophysics
Sara L. Dougherty, Chengxin Jiang, Robert W. Clayton, Brandon Schmandt, Steven M. Hansen
Summary: A study in central California reveals a slab-like feature extending from the Pacific coast to the foothills of the Sierra Nevada, connecting the subducted remnant of the Monterey microplate to a high-velocity anomaly in the upper mantle. This anomaly is believed to be a relic of the subduction zone before the capture of the Monterey microplate, rather than delamination of the lithosphere beneath the Sierra Nevada Mountains.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
V. B. Rivera Banuchi, W. Liu, N. Yee, C. Legett, T. D. Glotch, S. M. Chemtob
Summary: Clay minerals detected on Mars surface can provide important insights into the planet's climate and aqueous alteration history. Experimental results suggest that UV irradiation can oxidize iron in smectite, which may have influenced the mineralogy of Martian alteration assemblages.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Article
Engineering, Electrical & Electronic
Lei Ji, Hong-Bin Zhu, Xiao-Chun Li, Jun-Fa Mao
Summary: A method is proposed to enhance monomode bandwidth by filling the waveguide with materials of different permittivity. By using a low-permittivity material for the top substrate layer and a high-permittivity material for the bottom substrate layer, and drilling air holes in the top substrate layer to reduce its effective permittivity, a monomode bandwidth range of 2 to 14 GHz is achieved.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Dan Bassett, Gou Fujie, Shuichi Kodaira, Ryuta Arai, Yojiro Yamamoto, Stuart Henrys, Dan Barker, Andrew Gase, Harm Van Avendonk, Nathan Bangs, Hannu Seebeck, Brook Tozer, Katie Jacobs, Thomas Luckie, David Okaya, Kimi Mochizuki
Summary: Marine seismic data reveals the distribution of seamounts, sediment cover sequence, and crustal structure along the Hikurangi Plateau. Gravity data suggest that the variation in crustal thickness may be related to deformation and lithospheric extension. The variability in crustal thickness plays a significant role in plate boundary configuration and stress distribution.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Physics, Condensed Matter
Qin Jin, Hao Wang
Summary: In this study, two machine learning methods, principal component analysis (PCA) and neural network (NN), were used to investigate the influence of disorder on a system with partially-filled N = 2 Landau level. The results demonstrated that these machine learning approaches are effective tools that yield consistent results with previous numerical works. These methods have the potential to be applied to the study of other unfamiliar disordered systems.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
Meng Yao, Da Wang, Qiang-Hua Wang
Summary: In this paper, a novel determinant quantum Monte Carlo method is designed to tackle the sign problem in the Hubbard model, and the ground-state phase diagram of the model is studied for half-filled case.
Article
Environmental Sciences
Guilin Zhu, Geng Cui, Linyou Zhang, Qingda Feng, Eryong Zhang, Zhaoxuan Niu, Wenhao Xu, Xufeng Li, Zhihui Deng
Summary: Geothermal energy resources are abundant in the Qinghai Gonghe Basin, with the heat source being crustal overlying melt. The origin of the melt is still unclear. The hot water in the basin is recharged by atmospheric rainfall, and the reservoir temperature ranges from 140 to 240 celcius, indicating great potential. Numerical simulation reveals a thermal refraction effect and local thermal anomaly in certain areas of the basin. The high-temperature geothermal resources may be concentrated in areas associated with tectonic uplifting.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Automation & Control Systems
Phi Ha, Thieu Huy Nguyen
Summary: This article studies linear and semi-linear differential-algebraic equations (DAEs) on the half-line R+. In our approach, we first provide a characterization of the existence of exponential dichotomy for linear DAEs using the Lyapunov-Perron method. We then prove the existence of invariant stable manifolds for semi-linear DAEs under the condition that the evolution family corresponding to a linear DAE has an exponential dichotomy and the non-linear forcing function satisfies the non-uniform phi-Lipschitz condition.
JOURNAL OF DYNAMICAL AND CONTROL SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Kamil Yavuz Kapusuz, Andres Vanden Berghe, Sam Lemey, Hendrik Rogier
Summary: This paper presents a novel leaky-wave antenna (LWA) concept for automotive radar applications, utilizing a periodic set of holes in a half-mode SIW. The computer-aided design and fabrication of the LWA prototype demonstrate its high efficiency and performance in the 24 GHz automotive short-range radar band. Comparisons with other SIW LWAs show that the partially filled SIW technology provides an optimal tradeoff between different types for short-range automotive radar applications.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Lei Zhang, Xiao Li, Linlin Tai, Chunping Shen, Jun Yang, Chencheng Sun, Hongbo Geng, Xiaobing Zuo
Summary: Transition metal selenides have been explored for energy storage applications due to their large theoretical capacity and relatively high electronic conductivity, although their use in sodium-ion batteries has been limited by quick capacity decline and unconnected conducting networks. A novel FeSe2/CoSe2-CN electrode with improved electrochemical kinetics and stress adjustment is developed, exhibiting a high Na+ storage capacity and potentially high energy density properties when combined with Na3V2(PO4)(2)O2F. This research provides insights for the exploration of high-energy density energy-related components.
Article
Engineering, Civil
Ben Mou, Xu Liu, Ou Zhao, Henglin Xiao
Summary: The present study investigates the dynamic response of square concrete-filled steel tubular (CFST) columns under lateral impact in different directions through drop hammer tests at flat or corner zones. The experimental results demonstrate that the impact zone significantly affects the dynamic response of CFST specimens, with specimens impacted at corner zones more likely to fracture on the tensile side of the steel tube under higher impact energies. Furthermore, specimens impacted at the corner zone are more sensitive to changes in indenter radius. Smaller shear span ratios, built-in steel bars, and larger column sizes improve the impact resistance of the tested specimens.
ENGINEERING STRUCTURES
(2023)
