Results 51 to 60 of about 591,139 (353)
A study of low-energy transfer orbits to the Moon: towards an operational optimization technique [PDF]
, 2011 In the Earth-Moon system, low-energy orbits are transfer trajectories from the earth to a circumlunar orbit that require less propellant consumption when compared to the traditional methods. In this work we use a Monte Carlo approach to study a great number of such transfer orbits over a wide range of initial conditions.
arxiv +1 more source
A Method for Generating Closely Packed Orbital Shells and the Implication on Orbital Capacity [PDF]
arXiv, 2022 Shell-wise orbital slotting in Low Earth Orbit (LEO) can improve space safety, simplify space traffic coordination and management, and optimize orbital capacity. This paper describes two methods to generate 2D Lattice Flower Constellations (2D-LFCs) that are defined with respect to either an arbitrary degree or an arbitrary degree and order Earth ...
arxiv
Measuring a Low-Earth-Orbit Satellite Network
2023 IEEE 34th Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), 2023 Starlink and alike have attracted a lot of attention recently, however, the inner working of these low-earth-orbit (LEO) satellite networks is still largely unknown. This paper presents an ongoing measurement campaign focusing on Starlink, including its satellite access networks, gateway and point-of-presence structures, and backbone and Internet ...
Pan, Jianping, Zhao, Jinwei, Cai, Lin
openaire +2 more sources
A potential biomarker of cognitive impairment: The olfactory dysfunction and its genes expression
Annals of Clinical and Translational Neurology, Volume 9, Issue 12, Page 1884-1897, December 2022., 2022 Abstract Objective Accumulation evidence has reported that olfactory impairment may be an essential clinical marker and predictor of mild cognitive impairment or Alzheimer's disease. Method Participants were enrolled in the population‐based, prospective study in Fuxin county, Liaoning province, China between 2019 and 2021.
Jiayi Song +11 more
wiley +1 more source
Survey of Low Earth Orbit Satellite Communication Network Routing Technology
天地一体化信息网络, 2022 Low earth orbit satellite communication network is an important part of the internet of everything era, but the characteristics of satellite constellation topology such as high dynamic, limited heterogeneous resources and unbalanced network service ...
Shuang ZHENG, Xing ZHANG, Wenbo WANG
doaj +2 more sources
Earth-Venus Mission Analysis via Weak Capture and Nonlinear Orbit Control
Aerospace, 2023 Exploration of Venus is recently driven by the interest of the scientific community in understanding the evolution of Earth-size planets, and is leading the implementation of missions that can benefit from new design techniques and technology.
Giulio De Angelis +3 more
doaj +1 more source
The stability of polymers in low earth orbit
Materials & Design, 1986 Abstract Most organic polymers and some on polymeric materials such as silver or pigments suffer appreciable surface damage in the form of erosion or oxidation when exposed to the low earth orbit (LEO) environment encountered on shuttle flights. Surfaces facing the direction of flight suffer the most damage because of ram effects.
William T. K. Stevenson +2 more
openaire +2 more sources
FEBS Letters, EarlyView.The mitochondrial outer membrane iron–sulphur ([Fe‐S]) protein mitoNEET is a target of the type‐2 diabetes drug pioglitazone. Its unknown molecular function is linked to respiratory complex activity and mitochondrial function. We discovered that O2 protects the mitoNEET [2Fe‐2S] cluster against NO oxidation and desensitization towards reduction by H2S.
Thao Nghi Hoang +9 more
wiley +1 more source
Clinical heterogeneity in a family with flail arm syndrome and review of hnRNPA1‐related spectrum
Annals of Clinical and Translational Neurology, Volume 9, Issue 12, Page 1910-1917, December 2022., 2022 Abstract Objective Flail arm syndrome (FAS) is one of the atypical subtypes of amyotrophic lateral sclerosis (ALS). Mutations in hnRNPA1 encoding heterogeneous nuclear ribonucleoprotein (hnRNP) A1 are a rare genetic cause of ALS. Herein, marked clinical heterogeneity of FAS in a pedigree with a known hnRNPA1 variant was described to raise early ...
Xiaochen Han +5 more
wiley +1 more source
Accessibility of the resources of near Earth space using multi-impulse transfers [PDF]
, 2010 Most future concepts for exploration and exploitation of space require a large initial mass in low Earth orbit. Delivering this mass requires overcoming Earth's natural gravity well, which imposes a distinct obstacle to space-faring.
Bonanno C. +6 more
core +1 more source