Results 81 to 90 of about 32,070 (302)

One-Shot Initial Orbit Determination in Low-Earth Orbit

2024 IEEE Aerospace Conference
Due to the importance of satellites for society and the exponential increase in the number of objects in orbit, it is important to accurately determine the state (e.g., position and velocity) of these Resident Space Objects (RSOs) at any time and in a timely manner.
Ricardo Ferreira 0002, Marta Guimarães, Filipa Valdeira, Cláudia Soares   +3 more
openaire   +2 more sources

Conserved binding mode but diverse interfaces of MreC‐PBP2 interactions

FEBS Letters, EarlyView.
The crystal structure of abMreC reveals a conserved two β‐barrel architecture and provides structural insights into its role within the bacterial elongasome. The abMreC–abPBP2 complex model identifies the molecular basis of MreC‐mediated PBP2 recognition, contributing to the regulation of peptidoglycan synthesis.
Hyunseok Jang, Hyo Been Jin, Chang Min Kim, So Yeon Lee, Hyun Ho Park   +4 more
wiley   +1 more source

Vibration and Modal Analysis of Low Earth Orbit Satellite

Shock and Vibration, 2014
This paper presents design, modeling, and analysis of satellite model used for remote sensing. A detailed study is carried out for the design and modeling of the satellite structure focusing on the factors such as the selection of material, optimization ...
Asif Israr
doaj   +1 more source

Advancing Global Connectivity Through Low Earth Orbit Satellite Systems [PDF]

Iranian Journal of Information Processing & Management
Background: Satellite systems which orbit in Low Earth Orbit (LEO) are one of the innovative solutions to enable the connectivity in segregated geophysical parts of the world which are left out of the digital society, as they provide almost instantaneous,
Othman A. Hanshal, Suhad Qasim G. Haddad, Momunova Aigul Abdykerimovna, Hussain Kassim Ahmad, Faris Abdul Kareem Khazal   +4 more
doaj   +1 more source

A Sensitivity Study of POD Using Dual-Frequency GPS for CubeSats Data Limitation and Resources

Remote Sensing, 2020
Making use of dual-frequency (DF) global navigation satellite system (GNSS) observations and good dynamic models, the precise orbit determination (POD) for the satellites on low earth orbits has been intensively investigated in the last decades and has ...
Kan Wang, Amir Allahvirdi-Zadeh, Ahmed El-Mowafy, Jason N. Gross   +3 more
doaj   +1 more source

Stable and sustainable orbital capacity solutions in Low Earth Orbit

Acta Astronautica
Abstract The significant increase in the population of satellites in Low Earth Orbit raises concerns about the orbital carrying capacity, essentially the ability of the Low Earth Orbit environment to sustain a certain number of satellites without unsustainable levels of risk due to space debris or collisions.
Giovanni Lavezzi, Daniel Jang, Richard Linares   +2 more
openaire   +1 more source

AscF in the mycobacterial CIII–CIV supercomplex lacks metal and nucleotide binding but links malate oxidation to respiration

FEBS Letters, EarlyView.
The mycobacterial CIII‐CIV respiratory supercomplex is an obligate assembly, encompassing several subunits of unknown functions. We have characterized the intracellular subunit AscF, and show that it is unlikely to be a sensor for metals or nucleotides, but is required for growth on nonfermentable energy sources, and likely works as an adapter for ...
Eni Rile, Riccardo Diamanti, Daniel Lundin, Soni Sharma, Robin Lissner, Coenraad P. Kuil, Martin Högbom, Dirk Bald, Dan Sjöstrand   +8 more
wiley   +1 more source

A novel design concept for space-based polar remote sensing [PDF]

, 2012
Space-based remote sensing of the Earth is conducted from a fleet of spacecraft in two basic orbital positions, near-polar low-Earth orbits and geosynchronous orbits, with each offering its own advantages and disadvantages.
Macdonald, Malcolm, Anderson, Pamela, Warren, Carl   +2 more
core  

Low-thrust enabled highly non-Keplerian orbits in support of future Mars exploration [PDF]

, 2011
The technology of high specific impulse propulsion systems with low thrust is improving, opening up numerous possibilities for future missions applying continuous thrust to force a spacecraft out of a natural Keplerian orbit into a displaced non ...
Bosquillon de Frescheville, Francois, Biggs, James, Macdonald, Malcolm, Mckay, Robert, Vasile, Massimiliano, McKay, Robert J., BIGGS, JAMES DOUGLAS, McInnes, Colin, De Frescheville, Francois Bosquillon   +8 more
core   +1 more source

Solving Complex Low Earth Orbit-to-Geostationary Earth Orbit Transfer Problems Using Uniform Trigonometrization Method

Aerospace
Low-thrust orbit transfer problems are central to reducing mission costs and enabling cleaner, more efficient space travel. However, they remain difficult to solve using mathematically superior indirect methods of optimization.
Jackson T. Hurley, Kshitij Mall, Zhenbo Wang   +2 more
doaj   +1 more source