Results 71 to 80 of about 1,844,811 (291)

Development of On-orbit Predictions for the Middeck Active Control Experiment

IFAC Proceedings Volumes, 1994
Abstract The modeling and control design issues associated with a change in the operating environment are discussed for the Middeck Active Control Experiment (MACE): a Shuttle program scheduled for flight on STS-67, January 1995. MACE has been designed to investigate the extent to which the on-orbit behavior of flexible spacecraft can be predicted ...
J.P. How, D.W. Miller
openaire   +1 more source

On the predictability and robustness of Galileo disposal orbits [PDF]

Celestial Mechanics and Dynamical Astronomy, 2019
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
David J. Gondelach, Roberto Armellin, Alexander Wittig   +2 more
openaire   +5 more sources

Emerging experimental and computational methods for studying redox‐regulated structural transitions

FEBS Letters, EarlyView.
Redox reactions can reshape proteins and alter how they behave in cells, with important consequences for health and disease. This review explores emerging experimental and computational approaches for discovering these redox‐sensitive protein switches, revealing their structural effects, and predicting their behavior, opening new opportunities to ...
Tasneem Rass, Dana Reichmann, Gábor Erdős   +2 more
wiley   +1 more source

Orbit Prediction using Broadcast Ephemeris for GLONASS Satellite Visibility Analysis [PDF]

Journal of Astronomy and Space Sciences, 2009
Even though there are several Global Navigation Satellite Systems under development, only GPS and GLONASS are currently available for satellite positioning.
Hye-In Kim, Kwan-Dong Park
doaj   +1 more source

Structural and biochemical analysis of a B12 superbinder

FEBS Letters, EarlyView.
BtuG proteins are vitamin B12 scavengers in Bacteroides thetaiotaomicron, a dominant human gut bacterium. We present crystal structures of three BtuG homologs bound to cobalamin and its precursor cobinamide, revealing picomolar binding affinities, among the highest known for any natural protein.
Jose M. Martinez Felices, Jacob J. Whittaker, Dirk J. Slotboom, Albert Guskov   +3 more
wiley   +1 more source

A simplified Solar Radiation Pressure model for GNSS autonomous orbit prediction

, 2016
We present a two-parameter Solar Radiation Pressure model for GNSS autonomous orbit prediction, in which the parameters vary with the daily and seasonal variations in the angle between the Sun and the satellite’s orbital plane.
Robert Piche, Piche, Robert, Xiaolong Zhang, Zhang, Xiaolong   +3 more
core   +1 more source

Robust Short‐Term Forecasting of Thermospheric Density and Orbit Prediction Using an Interpretable iTransformer Model

Space Weather
Accurate short‐term forecasting of thermospheric mass density is crucial for satellite operations. However, achieving high‐precision predictions remains a significant challenge.
Mingyi Zhang, Xiangguang Meng, Xin Wang, Yueqiang Sun, Qifei Du, Weihua Bai, Peng Hu, Zhiqi Zhou   +7 more
doaj   +1 more source

A Graph Convolutional Network Framework for Area Attention and Tracking Compensation of In-Orbit Satellite

Applied Sciences
In order to solve the problems of low tracking accuracy of in-orbit satellites by ground stations and slow processing speed of satellite target tracking images, this paper proposes an orbital satellite regional tracking and prediction model based on ...
Shuai Wang, Ruoke Wu, Yizhi Jiang, Xiaoqiang Di, Yining Mu, Guanyu Wen, Makram Ibrahim, Jinqing Li   +7 more
doaj   +1 more source

Structures of mycobacterial 3‐methylcrotonyl‐CoA carboxylase reveal carrier‐domain translocation between catalytic sites

FEBS Letters, EarlyView.
Mycobacterial 3‐methylcrotonyl‐CoA carboxylase uses a mobile biotin‐carrying domain to shuttle a carboxyl group between two catalytic sites, enabling carboxylation of 3‐methylcrotonyl‐CoA during leucine breakdown. Cryo‐electron microscopy captures the carrier at both sites and reveals an inward loop movement that may prevent futile rebinding to the ...
Ajit Yadav, Bogdan I. Florea, Sebastian Geibel   +2 more
wiley   +1 more source

An accuracy and speed comparison of the Vinti and Brouwer orbit prediction methods [PDF]

, 1966
Accuracy and speed comparison of Vinti and Brouwer orbit prediction ...
Watson, J. S., Bonavito, N. L., Walden, H.   +2 more
core