Results 111 to 120 of about 4,818 (307)

Needs assessment of gossamer structures in communications platform end-of-life disposal

, 2013
The use of a gossamer structure is considered in application to end-of-life disposal of communications platforms. A wide-ranging survey of end-of-life disposal techniques and strategies is presented for comparison against a gossamer structure prior to a ...
Macdonald, Malcolm, McInnes, Colin, Bewick, Charlotte   +2 more
core  

Engineering Biochar‐Derived Functional Materials for High‐Performance Supercapacitors: Design Principles, Mechanisms, and Scalable Strategies

Carbon Energy, EarlyView.
ABSTRACT Biochar has emerged as a useful and adaptable source of carbon for supercapacitor electrodes. Its value comes from the way biomass chemistry, thermal conversion, and activation conditions shape the resulting pore network, surface groups, and degree of carbon ordering.
Soumen Mandal, Avinash C. Mendhe, Mayna Roy, Neha S. Barse, Taejoon Park, Han‐Seung Lee, Haigun Lee   +6 more
wiley   +1 more source

Si─Si Bonding in an Unsupported N‐Heterocyclic Silylene Dimer Stabilized by an Iminophosphorane‐Based Scorpionate Ligand Versus Head‐to‐Tail Coordination in the Sn and Pb Tetrylenes

Chemistry – A European Journal, EarlyView.
A new iminophosphorane‐based scorpionate ligand enabled the characterization of a head‐to‐head silylene dimer with unsupported Si─Si bonding, whereas the tetrylene species of Sn and Pb afforded head‐to‐tail coordination polymers in the solid state. ABSTRACT N,N‐chelating ligands disfavor element–element bonding in heavier alkene analogs of group 13 and
Huanhuan Dong, Rochelle Ferns, Luke W. Giles, Lea Fohlmeister, Connor Bourne, Samuel R. Lawrence, Aidan P. McKay, Alexandra M. Z. Slawin, David B. Cordes, Tanja van Mourik, Andreas Stasch   +10 more
wiley   +1 more source

Drag-free control of the GOCE satellite: noise and observer design [PDF]

, 2009
Enrico Canuto, Massotti, L., Luca Massotti, Andres Molano, MOLANO JIMENEZ, ANDRES GUILLERMO, Molano-Jimenez, A., Massotti, Luca, Canuto, Enrico, Molano, A.   +8 more
core   +1 more source

Drag-free satellite control

, 1989
A drag-free satellite cancels the effect of external disturbances. Although the forces may be small, a satellite is disturbed by residual air drag, radiation pressure, micrometeorite impact, and other small forces that act on its surface disturbing its ...
Debra, Daniel B.
core  

Thermospheric mass density derived in near real time from space debris

Journal of Space Weather and Space Climate
Near-Earth space is becoming increasingly congested. A rapid increase in the number of orbiting objects around Earth underscores the need for accurate tracking and prediction of space objects.
Johlander Andreas, Papadogiannakis Seméli, Rasmusson Ola   +2 more
doaj   +1 more source

Automated Process Optimization in a Novel Triple Shaft Mixer with Adaptive Mixing Modes

Chemie Ingenieur Technik, EarlyView.
A novel multi‐purpose mixer with adjustable blade angle and a coaxial stirrer is developed, providing three degrees of freedom. An optimization strategy is integrated to autonomously identify optimal operating conditions through automated tests. The current draw of the main stirrer serves as the optimization criterion, while stirrer speeds, directions,
B. Schwarz, H. Kniele, J. A. Lindner
wiley   +1 more source

Advances In Atmospheric Drag Force Modeling for Satellite Orbit Prediction and Density Estimation

, 2021
Atmospheric drag is the largest nongravitational perturbing force acting on low altitude low Earth orbit (LEO) satellites and debris, and the modeling and estimation of drag effects is a limiting problem in the prediction of their orbits over time.
Ray, Vishal
core   +1 more source

Applying Energy Dissipation Rate GNSS Accelerometry to a Non‐Circular Orbiting Satellite

Earth and Space Science
The increase in the number of objects in Low‐Earth Orbit has heightened the demand for high‐accuracy orbital prediction models driven by dependable measurements of thermospheric mass density (TMD).
D. J. Fitzpatrick, R. L. Bishop, M. D. Pilinski, S. E. Palo   +3 more
doaj   +1 more source

What Do We Know About How Companies Manage Waste? The Effect of Tenure and Diversity of Directors on Disclosures

Corporate Social Responsibility and Environmental Management, EarlyView.
ABSTRACT This paper aims to analyze the effect of board tenure on firms' waste management disclosure and explore whether this effect is amplified by board gender and cultural diversity. The analysis is based on data from 832 large firms worldwide from 2011 to 2020.
Isabel‐María García‐Sánchez, Beatriz Aibar‐Guzmán, Salvador Marín‐Hernández, Esther Ortiz‐Martínez   +3 more
wiley   +1 more source