Article
Engineering, Aerospace
Elise J. Fahy, David R. Buttsworth, Rowan J. Gollan, Peter A. Jacobs, Richard G. Morgan, Christopher M. James
Summary: In this study, near-infrared and ultraviolet spectroscopic data collected during the reentry of the Hayabusa spacecraft were used to validate numerical and experimental studies. The results showed that the infrared spectra compared well, while the ultraviolet spectra did not match closely. Comparisons between simulated and flight ultraviolet spectra were more favorable, within an uncertainty of around 50%.
JOURNAL OF SPACECRAFT AND ROCKETS
(2021)
Article
Multidisciplinary Sciences
Jie Zhang, Qianqian Ji, Zheng Sheng, Mingyuan He, Yang He, Xinjie Zuo, Zefeng He, Zilin Qin, Gangyao Wu
Summary: The Martian Atmospheric Waves Perturbation Datasets (MAWPD) version 2.0 is the first observation-based climatology dataset of Martian atmospheric waves. It utilizes the Data INterpolating Empirical Orthogonal Functions method (DINEOF) for data assimilation with observational data from various Mars missions. The dataset provides climatological background information on temperature and wave disturbances on Mars, which is useful for scientific studies and cross-validation with model-based datasets.
Article
Physics, Multidisciplinary
Fahad Mahmood, Dipanjan Chaudhuri, Sarang Gopalakrishnan, Rahul Nandkishore, N. P. Armitage
Summary: This study investigates the impact of coherent excitations and photon echoes on the decay processes of doped silicon materials, extracting energy relaxation and decoherence rates close to the metal-insulator transition. The observed linear relationship between rates and excitation frequency, as well as counterintuitive behaviors at different temperatures and doping levels, suggest that the system behaves as a well-isolated electronic system controlled by electron-electron interactions. These observations contribute to a distinct phenomenology, known as the marginal Fermi glass, driven by the interplay of strong disorder and strong electron-electron interactions.
Article
Engineering, Aerospace
Hirotaka Otsu
Summary: By studying re-entry capsules designed with hyperbolic contours, it was found that drag and lift coefficients can be increased without drastically changing the shape of the capsule. This suggests that shape design based on hyperbolic contours can improve the aerodynamic characteristics of re-entry capsules.
Article
Multidisciplinary Sciences
Sho Watanabe, Vinayak S. Bhat, Korbinian Baumgaertl, Mohammad Hamdi, Dirk Grundler
Summary: The study reports a two-dimensional magnonic quasicrystal formed on ferrimagnetic yttrium iron garnet, with phase-resolved spin wave imaging at gigahertz frequencies showing multidirectional emission and partial forbidden gaps.
Article
Chemistry, Physical
Yue-Rou Zhang, Dao-Fu Yuan, Lai-Sheng Wang
Summary: This article reports the observation of a core-excited dipole-bound state (DBS) in the pyrazolide anion. The binding energy of this core-excited DBS is measured, thanks to the favorable electronic structure of the neutral pyrazolyl core.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Engineering, Aerospace
Alberto Fedele, Sanny Omar, Stefania Cantoni, Raffaele Savino, Riccardo Bevilacqua
Summary: The article proposes a new technological solution for re-entering and landing a spacecraft in a desired location from a low Earth orbit using exclusively aerodynamic drag and eliminating the need for chemical propulsion. The solution involves an iterative procedure to compute the desired state at the re-entry interface, a re-entry point targeting algorithm, and iterative modifications to correct landing errors.
ADVANCES IN SPACE RESEARCH
(2021)
Article
Multidisciplinary Sciences
Shao-Pin Chiu, C. C. Tsuei, Sheng-Shiuan Yeh, Fu-Chun Zhang, Stefan Kirchner, Juhn-Jong Lin
Summary: Triplet pairing has been observed in nonmagnetic CoSi2/TiSi2 heterostructures on silicon, indicating chiral p-wave pairing. This discovery is significant for topological materials and quantum technology research, and suggests potential applications of CoSi2 and TiSi2 in silicon-based integrated-circuit technology.
Article
Engineering, Aerospace
Francesco Salmaso, Mirko Trisolini, Camilla Colombo
Summary: The growing number of objects orbiting around the Earth will lead to more uncontrolled re-entries into the Earth's atmosphere, which are challenging to predict due to uncertainties. This study proposes a data-driven approach using a deep learning model to enhance re-entry prediction accuracy for uncontrolled objects in Low Earth Orbit (LEO).
Article
Chemistry, Multidisciplinary
Zoe C. Adams, Erika J. Olson, Tania L. Lopez-Silva, Zhengwen Lian, Audrey Y. Kim, Matthew Holcomb, Jorg Zimmermann, Ramkrishna Adhikary, Philip E. Dawson
Summary: This study utilized transparent window infrared spectroscopy to characterize self-assembling molecules, particularly in cases involving phase separation or precipitation. By introducing C-D bonds as probes at specific locations in peptides and proteins, the positions and motion of these side chains in the molecular environment were determined. Additionally, the study revealed a cooperative self-assembly process in MAX1 peptide hydrogels.
Article
Physics, Multidisciplinary
Hyok Sang Han, Ahreum Lee, Kanupriya Sinha, Fredrik K. Fatemi, S. L. Rolston
Summary: This study demonstrates collectively enhanced vacuum-induced quantum beat dynamics from a three-level V-type atomic system. The subsequent radiative dynamics exhibit superradiant decay rates and collectively enhanced quantum beats. This work is the first experimental illustration of quantum beats arising from atoms initially prepared in a single excited level due to vacuum-induced coupling between excited levels.
PHYSICAL REVIEW LETTERS
(2021)
Article
Engineering, Aerospace
Andrea Aprovitola, Nicolina Montella, Luigi Iuspa, Giuseppe Pezzella, Antonio Viviani
Summary: This paper discusses the feasibility analysis of a re-entry flight strategy from low Earth orbit for a re-usable wing-body concept with a high surface-to-mass ratio. The study explores the relationship between surface-to-mass ratio, lift-to-drag ratio, and flight duration time to modulate aerothermal loading and improve reliability and affordability of space operations in near Earth space. The chosen flight approach involves modulating the glider angle of attack to control the desired convective heat flux level.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Aurelie Bellucci, Jean-Francois Goester, Deborah Hazan
Summary: The Surface Water & Ocean Topography (SWOT) mission is a joint NASA/CNES mission that was launched in December 2022 for oceanography and continental hydrology. The mission requires a controlled re-entry to comply with French space regulations. The re-entry maneuvers and risk analysis have been determined by CNES using specific tools such as DOORS, DEBRISK, and ELECTRA.
Article
Engineering, Aerospace
Seong-Hyeon Park, Dominik Neeb, Gennady Plyushchev, Penelope Leyland, Ali Guelhan
Summary: The study investigates and compares heat flux correlations in object-oriented tools used for re-entry analysis, showing significant differences in survivability estimations for small spheres made of aluminum due to variations in the heat flux correlation, emphasizing the importance of considering heat flux correlations and velocity gradient effects in re-entry analysis.
Article
Multidisciplinary Sciences
Andre Al-Haddad, Solene Oberli, Jesus Gonzalez-Vazquez, Maximilian Bucher, Gilles Doumy, Phay Ho, Jacek Krzywinski, Thomas J. Lane, Alberto Lutman, Agostino Marinelli, Timothy J. Maxwell, Stefan Moeller, Stephen T. Pratt, Dipanwita Ray, Ron Shepard, Stephen H. Southworth, Alvaro Vazquez-Mayagoitia, Peter Walter, Linda Young, Antonio Picon, Christoph Bostedt
Summary: This study demonstrates the ability to track ultrafast electron rearrangement and chemical bond breaking in real time at specific sites using X-ray photoelectron spectroscopy. By observing the chemical shifts of the carbon core-electron binding energy, the authors can investigate charge redistribution and dissociation processes.
NATURE COMMUNICATIONS
(2022)
Article
Thermodynamics
Ulf Fuchs, Stefan Loehle, Stefanos Fasoulas
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2015)
Article
Thermodynamics
S. Loehle, J. I. Frankel
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2015)
Article
Thermodynamics
H. Fulge, S. Loehle, S. Fasoulas
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2016)
Article
Thermodynamics
Stefan Loehle, Andreas Steinbeck, Stefanos Fasoulas
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2016)
Article
Thermodynamics
Stefan Loehle, Sven Schweikert, Jens von Wolfersdorf
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2016)
Article
Thermodynamics
Tobias Hermann, Stefan Loehle, Fabian Zander, Hannes Fulge, Stefanos Fasoulas
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2016)
Article
Engineering, Multidisciplinary
Hui Wang, Dejiang Chen, Qingtao Yang, Jun Zhang, Liping Liu, Stefan Lohle
Article
Thermodynamics
Stefan Loehle
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2017)
Article
Optics
Tobias Hermann, Stefan Loehle, Fabian Zander, Stefanos Fasoulas
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2017)
Article
Thermodynamics
F. Zander, T. Marynowski, S. Loehle
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2017)
Article
Thermodynamics
Tobias Hermann, Stefan Lohle, Stefanos Fasoulas, Penelope Leyland, Lionel Marraffa, Jean-Marc Bouilly
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
(2017)
Article
Engineering, Aerospace
S. Loehle, T. Hermann, F. Zander
CEAS SPACE JOURNAL
(2018)
Article
Physics, Applied
Fabian Zander, Stefan Loehle, Tobias Hermann, Hannes Fulge
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2017)
Article
Astronomy & Astrophysics
Stefan Loehle, Fabian Zander, Tobias Hermann, Martin Eberhart, Arne Meindl, Rainer Oefele, Jeremie Vaubaillon, Francois Colas, Pierre Vernazza, Alexis Drouard, Jerome Gattacceca
ASTROPHYSICAL JOURNAL
(2017)
Article
Meteorology & Atmospheric Sciences
M. Eberhart, S. Loehle, A. Steinbeck, T. Binder, S. Fasoulas
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2015)
Article
Engineering, Aerospace
A. I. Krikunova, A. D. Cheshko, V. V. Krivets
Summary: Fire safety is crucial for the development of efficient and safe energy systems for space objects. This paper focuses on studying the influence of gravity on combustion processes and analyzes the dynamics of inverted conical methane-air flame under external acoustic excitation. The results show that at high excitation frequencies, the intensity of vortex generation is similar to that observed in experiments with normal gravity, indicating the dominance of acoustic mechanism. Additionally, at an external excitation frequency of 240 Hz, significant growth in shear vortex diameters and increased amplitude of perpendicular oscillations of flame branches were observed, indicating the most intensive large scale instability of flow.
Article
Engineering, Aerospace
Liya Huang, Mingquan Gong, Jiarui Zhang, Kun Liang, He Yang
Summary: Metallized gel propellants with exceptional stability and remarkable shear-thinning properties were successfully synthesized by utilizing cooperative hydrogen bonding between polymer octanoyl cellulose and the small Thixatrol ST molecule.
Article
Engineering, Aerospace
Clemence Poirier, Michelle Hermes, Marco Aliberti
Summary: This paper examines the role of space-based data in European climate policies and assesses the barriers to the use of space technology in climate policymaking in European countries. The research findings indicate that while satellite data is crucial for scientific research and climate policies, the role of space is not accurately reflected in European climate policies.
Article
Engineering, Aerospace
Yan-mei Zhou, Ji-ping Wu, Wei Huang, Gautam Choubey
Summary: This study investigates the combustion performance of sinusoidal pulsed jets in supersonic flows using numerical simulations. It is found that the pulsed jets can significantly improve combustion efficiency.
Article
Engineering, Aerospace
Wang Zhao, Shujun Tan, Yiliang Guo
Summary: This study proposes an adaptive Pogo active suppression controller design method that utilizes measured acceleration as feedback. The eigenspace transformation theory is employed to design dimensional reduced models for observer and adaptive controller, effectively addressing the issues of model parameter uncertainty and time-varying parameters. Simulation analysis of a certain type of rocket demonstrates the effectiveness of the proposed method.
Article
Engineering, Aerospace
A. V. Nebylov, V. A. Nebylov
Summary: This article discusses the safety issues of astronauts during the landing process and investigates how rescuers can effectively carry out rescue missions. The article also takes into account the special maritime conditions of the Vostochny cosmodrome.
Article
Engineering, Aerospace
Pietro Davide Maddio, Rosario Sinatra, Alberto Meschini, Riccardo Rigato, Marco Lapi, Davide Scarozza, Alessandro Cammarata
Summary: This study aims to develop a versatile cable net generation algorithm for designing offset cable nets in parabolic reflectors. The study proposes a methodology that leverages quasi-geodesic curves and introduces two types of these curves. The study also presents various solutions for different cable net layouts and introduces a quality index based on an equilateral triangle cable net.
Article
Engineering, Aerospace
Nahum Melamed, Tom Heinsheimer
Summary: Traditional methods of asteroid trajectory modification rely on impact or nuclear detonation, while centrifugal propulsion offers an alternative approach. The centrifuge system lands on the asteroid and gradually adjusts the trajectory using momentum transfer. This method allows for flexibility in operation parameters and has the potential to be used in planetary defense and other space missions.
Article
Engineering, Aerospace
Andrew Barth, Ou Ma
Summary: As humans continue to explore the surfaces of the Moon and Mars, the use of distributed heterogeneous robot teams can increase the chances of success by utilizing the complementary capabilities and synergy of the team members. Effective cooperation and collaboration between the members of a robot team is crucial, but defining a metric for effective cooperation is challenging. This paper presents a method for determining reward criteria that can be used for training robot swarm through reinforcement learning techniques. The trained robot team exhibits high success rates and cooperative behavior in test environments, demonstrating the robustness and scalability of the training strategies.
Article
Engineering, Aerospace
Kaijie Zhu, Qiquan Quan, Dewei Tang, Yachao Dong, Kaiyi Wang, Bo Tang, Qi Wu, Zongquan Deng
Summary: This study proposes a deployable Mars quadcopter for air patrol and sampling missions. By describing its structure, avionics architecture, and autonomous flight control method, it provides a feasible framework for future Mars flight sampling missions.
Article
Engineering, Aerospace
Avishai Melamed, Adi Rao, Sarah Kreps, Erika Palmer
Article
Engineering, Aerospace
Colin Hunter, Avinkrishnan Vijayachandran, Anthony M. Waas
Summary: Deployable structures inspired by origami have gained significant prominence in space applications. Recent advancements in multi-material additive manufacturing have opened new possibilities for the fabrication of monolithic structures. This paper presents a novel framework for designing deployable structures using viscoelastic hinges incorporated into rigid plates. Experimental results demonstrate the effectiveness and feasibility of these hinge designs in real-world applications.
Article
Engineering, Aerospace
Aleksander V. Efremov, Mikhail S. Tiaglik, Aleksey S. Tiaglik, Iliyas Kh Irgaleev, Tatyana V. Voronka
Summary: Theoretical and experimental studies were conducted to determine the best kind of information presented on a predictive display for the highest accuracy in space mission execution, while considering reduced propellant consumption.
Article
Engineering, Aerospace
Fuwen Liang, Long Miao, Feng Tian, Jiahui Song, Ningfei Wang, Xiao Hou
Summary: This study investigates the influence of deployment friction on the dynamic characteristics of nonconductive space tether through experimental measurement and numerical simulation. The results show that deployment friction significantly limits the uncontrolled tether deployment, while increasing the initial deployment velocity and satellite effective mass, as well as decreasing orbital altitude, can enhance the deployment capability and dynamic stability. In addition, an optimal matching relationship between tether length and satellite total mass is proposed, which is of substantial importance for the design of nonconductive space tether systems.
Article
Engineering, Aerospace
Amirah R. Algethami, Colin R. McInnes, Matteo Ceriotti
Summary: This paper utilizes the Hill's approximation model to manipulate the relative motion of two asteroids by three impulses, resulting in their bound binary motion in Earth's orbit. The feasibility of this strategy is demonstrated, and potential applications for parking small captured near-Earth asteroids in Earth's orbit are discussed.
