Results 61 to 70 of about 16,250 (289)

Autonomous Rendezvous and Docking with Nonfull Field of View for Tethered Space Robot

International Journal of Aerospace Engineering, 2017
In the ultra-close approaching phase of tethered space robot, a highly stable self-attitude control is essential. However, due to the field of view limitation of cameras, typical point features are difficult to extract, where commonly adopted position ...
Panfeng Huang, Lu Chen, Bin Zhang, Zhongjie Meng, Zhengxiong Liu   +4 more
doaj   +1 more source

Meteorological and air quality measurements in a city region with complex terrain: influence of meteorological phenomena on urban climate

Meteorologische Zeitschrift, 2023
On 8 and 9 July 2018 extensive observations were conducted under fair-weather conditions in the German city of Stuttgart and its surroundings. This intensive observation period, part of the four weeks Urban Climate Under Change (UC)2 campaign, intended ...
Abdul Samad, Olga Kiseleva, Christopher Claus Holst, Robert Wegener, Meinolf Kossmann, Gregor Meusel, Alina Fiehn, Thilo Erbertseder, Ralf Becker, Anke Roiger, Peter Stanislawsky, Dieter Klemp, Stefan Emeis, Norbert Kalthoff, Ulrich Vogt   +14 more
doaj   +1 more source

Fixed-Time Attitude Control for a Flexible Space-Tethered Satellite via a Nonsingular Terminal Sliding-Mode Controller

Aerospace
This paper presents a rigid–flexible coupling dynamic modeling framework and a fixed-time control strategy for a flexible space-tethered satellite (STS) system.
Cong Xue, Qiao Shi, Hecun Zheng, Baizheng Huan, Weiran Yao, Yankun Wang, Xiangyu Shao   +6 more
doaj   +1 more source

Observations of the vertical distributions of summertime atmospheric pollutants and the corresponding ozone production in Shanghai, China [PDF]

Atmospheric Chemistry and Physics, 2017
Ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) and lidar measurements were performed in Shanghai, China, during May 2016 to investigate the vertical distribution of summertime atmospheric pollutants.
C. Xing, C. Xing, C. Liu, C. Liu, C. Liu, C. Liu, C. Liu, S. Wang, K. L. Chan, Y. Gao, X. Huang, W. Su, C. Zhang, Y. Dong, G. Fan, T. Zhang, Z. Chen, Q. Hu, H. Su, H. Su, Z. Xie, Z. Xie, Z. Xie, Z. Xie, J. Liu, J. Liu   +25 more
doaj   +1 more source

Basic Orbit Design and Maneuvers for Satellite Constellations Deployed Using Momentum Exchange Tethers

Aerospace
This article describes a new alternative approach to satellite constellation deployment by incorporating momentum exchange tethers (METs). Traditional methods of deploying satellite constellations have limitations, typically involving costly propulsion ...
Ben Campbell, Lawrence Dale Thomas
doaj   +1 more source

The future of Earth observation in hydrology [PDF]

Hydrology and Earth System Sciences, 2017
In just the past 5 years, the field of Earth observation has progressed beyond the offerings of conventional space-agency-based platforms to include a plethora of sensing opportunities afforded by CubeSats, unmanned aerial vehicles (UAVs), and smartphone
M. F. McCabe, M. Rodell, D. E. Alsdorf, D. G. Miralles, R. Uijlenhoet, W. Wagner, W. Wagner, A. Lucieer, R. Houborg, N. E. C. Verhoest, T. E. Franz, J. Shi, H. Gao, E. F. Wood   +13 more
doaj   +1 more source

Learning characteristics of a space-time neural network as a tether skiprope observer [PDF]

The Software Technology Laboratory at the Johnson Space Center is testing a Space Time Neural Network (STNN) for observing tether oscillations present during retrieval of a tethered satellite.
Copeland, Charles, Jani, Yashvant, Lea, Robert N., Villarreal, James A.   +3 more
core   +1 more source

Forcing the Side‐on π‐Coordination of a C≡C Triple Bond to Technetium Using the As,CC,As Alkyne Pincer Ligand 1,2‐Bis(2‐(diisopropylarsaneyl)‐4‐(trifluoromethyl)phenyl)Ethyne

Angewandte Chemie International Edition, EarlyView.
Technetium alkyne complexes have eluded isolation for decades with the only indicators for their existence being the isolation of vinylidene carbenes or their follow‐up reaction products despite plentiful of reports for neighboring elements. Stable, crystalline Tc(III) and Tc(V) alkyne complexes (and their Re analogs) have now been prepared and fully ...
Maximilian Roca Jungfer, Moritz Johannes Ernst, Lukas Eberle, Marius Kesselring, Guilhem Claude, Joachim Ballmann   +5 more
wiley   +1 more source

Dynamic analysis of the tethered satellite system considering uncertain but bounded parameters

Defence Technology
Dynamic analysis of the tethered satellite system (TSS) can provide a fundamental guideline to the evaluation of performance and robust design of the system examined.
Xin Jiang, Zhengfeng Bai
doaj   +1 more source

Satellite-based analysis of ocean-surface stress across the ice-free and ice-covered polar oceans [PDF]

Earth System Science Data
Ocean-surface stress is a critical driver of polar sea-ice dynamics, air–sea interactions, and ocean circulation. This work provides a daily analysis of ocean-surface stress on 25 km Equal-Area Scalable Earth (EASE) grids across the ice-free and ice ...
C. Liu, C. Liu, L. Yu
doaj   +1 more source