The fuel carried by deep space exploration spacecraft is crucial for the completion of their exploration missions, and the fuel for attitude control engines is even more precious. In order to reduce the control requirements for attitude control systems, this paper proposes a shape-based trajectory optimization algorithm that considers attitude constraints for low-thrust spacecraft. This method obtains a more accurate transfer trajectory by considering the change rate and change range constraints of the propulsion acceleration direction of spacecraft. By comparing the simulation results without considering spacecraft attitude constraints, it is confirmed that the proposed algorithm considering attitude constraints is very important for the initial design of transfer trajectories. This is of great significance for high-precision initial trajectory optimization of deep space exploration missions.
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http://dx.doi.org/10.1038/s41598-024-70830-8 | DOI Listing |
CHEST Pulm
December 2024
Division of General Internal Medicine, Department of Medicine, Weill Cornell Medicine, New York, NY, United States.
Front Psychol
December 2024
CICPSI, Faculdade de Psicologia, Universidade de Lisboa, Lisbon, Portugal.
We assessed the perceived authenticity of attitudes expressed toward several social groups as a function of whether those attitudes were expressed by the self or by other people, and whether those expressions were automatic (without time to ponder) or controlled (without time constraints). Participants considered their controlled responses more authentic than their automatic responses. However, the same did not happen when considering others' attitudes.
View Article and Find Full Text PDFBMC Med Educ
December 2024
Department of Medical Education, Geisinger Commonwealth School of Medicine, Geisinger College of Health Sciences, 525 Pine Street, Scranton, PA, 18509, USA.
Background: The American Society of Clinical Nutrition recommends 37 to 44 h of undergraduate medical nutrition education. The Total Health Curriculum at Geisinger Commonwealth School of Medicine (GCSOM) contains 14 h of objective-based nutritional instruction. This study aimed to examine the perceptions of key stakeholders regarding the role of nutrition in medicine and to identify barriers, opportunities for improvement, and roles/responsibilities for innovative implementation of nutrition education.
View Article and Find Full Text PDFBMJ Open
December 2024
Centre for Global Mental Health, Health Service and Population Research Department, Institute of Psychiatry, Psychology & Neuroscience, King's College London, London, London, UK.
Objective: To explore the perceptions and experiences of mental health service users and healthcare workers regarding the implementation of district mental healthcare plans (DMHPs) in three district demonstration sites in Ghana.
Design: The study employed a qualitative design using reflexive thematic analysis. Interview data were analysed by combining inductive and deductive approaches.
Clin Pract
December 2024
Department of Restorative Dental Medicine and Endodontics, Study of Dental Medicine, School of Medicine, University of Split, 21000 Split, Croatia.
Aim: This study aims to assess Croatian dentists' knowledge, attitudes, and use of artificial intelligence (AI) and modern technology, while also identifying perceived barriers to AI and modern technology adoption and evaluating the need for further education and training.
Materials And Methods: A cross-sectional survey was conducted in February 2024 among general dentists in Croatia using a self-structured questionnaire. A total of 200 respondents filled out the questionnaire.
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