Three-impulse point return orbit design for the manned lunar high-latitude exploration mission
Sign Up to like & getrecommendations! Published in 2021 at "Acta Astronautica"
DOI: 10.1016/j.actaastro.2020.10.048
Abstract: Abstract A three-impulse point return orbit design method is proposed for the manned lunar high-latitude exploration mission. First, considering the restrictions of the reentry corridor and the landing point simultaneously, the constraint conditions of the… read more here.
Keywords: point return; three impulse; return orbit; orbit ... See more keywords
Progression of Physical Frailty and the Risk of All‐Cause Mortality: Is There a Point of No Return?
Sign Up to like & getrecommendations! Published in 2020 at "Journal of the American Geriatrics Society"
DOI: 10.1111/jgs.16976
Abstract: To investigate the rate and patterns of accumulation of frailty manifestations in relationship to all‐cause mortality and whether there is a point in the progression of frailty beyond which the process becomes irreversible and death… read more here.
Keywords: point return; cause mortality; point; frailty ... See more keywords
Design of contingency point return trajectory in the lunar orbit insertion phase for crewed lunar exploration missions
Sign Up to like & getrecommendations! Published in 2022 at "Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering"
DOI: 10.1177/09544100221138131
Abstract: To satisfy the requirement of contingency rescue in the lunar orbit insertion phase for crewed lunar exploration missions, this paper designs the contingency point return trajectory. First, according to different failure situations of the main… read more here.
Keywords: contingency; point return; insertion phase; orbit insertion ... See more keywords
A retrospective cohort study about hip luxation in non-ambulatory cerebral palsy patients: The point of no return
Sign Up to like & getrecommendations! Published in 2022 at "Journal of Children's Orthopaedics"
DOI: 10.1177/18632521221106361
Abstract: Purpose: The migration percentage is a widely used criterion for surgery in displaced hips. Literature suggests that no hip can spontaneously improve if the migration percentage exceeds 45%, in a mixed population of cerebral palsy… read more here.
Keywords: point return; cerebral palsy; migration percentage;