Results 41 to 50 of about 1,971 (165)

Numerical investigation of the Arctic ice–ocean boundary layer and implications for air–sea gas fluxes [PDF]

Ocean Science, 2017
In ice-covered regions it is challenging to determine constituent budgets – for heat and momentum, but also for biologically and climatically active gases like carbon dioxide and methane. The harsh environment and relative data scarcity make it difficult
A. Bigdeli, B. Loose, A. T. Nguyen, S. T. Cole   +3 more
doaj   +1 more source

Oxpecker: A Tethered UAV for Inspection of Stone-Mine Pillars

Drones, 2023
This paper presents a state-of-the-art tethered unmanned aerial vehicle (TUAV) for structural integrity assessment of underground stone mine pillars. The TUAV, powered by its tether, works in tandem with an unmanned ground vehicle (UGV) that hosts the ...
Bernardo Martinez Rocamora, Rogério R. Lima, Kieren Samarakoon, Jeremy Rathjen, Jason N. Gross, Guilherme A. S. Pereira   +5 more
doaj   +1 more source

Dynamics and Control of a Tethered Satellite System Based on the SDRE Method

International Journal of Aerospace Engineering, 2016
This paper presents the nonlinear dynamic modeling and control of a tethered satellite system (TSS), and the control strategy is based on the state-dependent Riccati equation (SDRE).
Yong-Lin Kuo
doaj   +1 more source

Meteorological conditions during the ACLOUD/PASCAL field campaign near Svalbard in early summer 2017 [PDF]

Atmospheric Chemistry and Physics, 2018
The two concerted field campaigns, Arctic CLoud Observations Using airborne measurements during polar Day (ACLOUD) and the Physical feedbacks of Arctic planetary boundary level Sea ice, Cloud and AerosoL (PASCAL), took place near Svalbard from 23 May to ...
E. M. Knudsen, B. Heinold, S. Dahlke, S. Dahlke, H. Bozem, S. Crewell, I. V. Gorodetskaya, G. Heygster, D. Kunkel, M. Maturilli, M. Mech, C. Viceto, A. Rinke, H. Schmithüsen, A. Ehrlich, A. Macke, C. Lüpkes, M. Wendisch   +17 more
doaj   +1 more source

Hardware-in-the-Loop Testing of Spacecraft Relative Dynamics and Tethered Satellite System on a Tip-Tilt Flat-Table Facility

Aerospace
This article presents a compact tip-tilting platform designed for hardware-in-the-loop emulation of spacecraft relative dynamics and a physical setup for testing tethered systems. The architecture consists of a granite slab supported by a universal joint
Giuseppe Governale, Armando Pastore, Matteo Clavolini, Mattia Li Vigni, Christian Bellinazzi, Catello Leonardo Matonti, Stefano Aliberti, Riccardo Apa, Marcello Romano   +8 more
doaj   +1 more source

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

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

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

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

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