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PHiFA—A tool for numerical propagation of high-fidelity astrodynamics

Astrodynamics 2022年第2期6卷 189-204页

作者： Yang Yang erik klein Changyong He Han Cai Yan Zhang School of Aeronautics and Astronautics Sun Yat-sen UniversityShenzhen 518000China TU Braunschweig Institut for Space Systems38108 BraunschweigGermany ENSG-Géomatics Institut national de l’information géographique et forestière(IGN)F-77455 Marne-la-ValléeFrance School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

This paper presents a tool for the numerical propagation of high-fidelity astrodynamics,called *** coupled orbit–attitude dynamics for space objects are modeled by considering various types of perturbative forces and *** methods have been implemented to calculate the surface forces:the area matrix method and the beam *** beam method is more precise as it discretizes the source media(e.g.,sunlight and aerodynamic wind)and the surface of the target into multiple rays and finite elements,respectively,and then accumulates the effect of each *** PHiFA tool was tested and validated using a 3U CubeSat model and the defunct European environment satellite(Envisat)model.

关键词： coupled orbit-attitude dynamics surface force modeling beam method European environment satellite (Envisat)

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Assessment of regional ventilation distribution:Comparison of vibration response imaging with electrical impedance tomography

Assessment of regional ventilation distribution:Comparison o...

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中国毒理学会第六届全国毒理学大会

作者： SHI Chang Stefan BOEHME Alexander H BENTLEY erik K HARTMANN Klaus U klein Marc BODENSTEIN Roman ULLRICH Klaus MARKSTALLER Department of Anaesthesiology Medical Centre of the Johannes Gutenberg-University Mainz National Beijing Center for Drug Safety Evaluation and Research Beijing Institute of Pharmacology and Toxicology

＜正＞OBJECTIVE Vibration response imaging（VRI） is a new bedside technology to monitor ventilation by detecting lung sound *** is currently unknown whether VRI is able to accurately monitor the local distribution of ventilation within the *** therefore compared VRI to electrical impedance tomography（EIT）,an established technique used for the assessment of regional ventilation. METHODS For peer review,simultaneous EIT and VRI measurements were performed in the healthy and injured lungs（ALI;induced by saline lavage） at different PEEP levels（0,5,10,15 mbar） in nine *** energy amplitude（VEA） by VRI,and amplitudes of relative impedance changes（rel. AZ） by EIT,were evaluated in seven regions of interest（ROIs）.To assess the distribution of VT by VRI and EIT,absolute values were normalized to the VT obtained by simultaneous spirometry measurements. RESULTS Redistribution of ventilation by ALI and PEEP was detected by VRI and *** linear correlation between pooled VT by VEA and *** was R =***-Altman analysis showed a bias of -1.07±24.71 ml and limits of agreement of -49.05 to +47.36 *** the different ROIs, correlations of VT - distribution by EIT and VRI ranged between R values ofO.29 and *** and PEEP did not alter the agreement of VT between VRI and *** Measurements of regional ventilation distribution by VRI are similar to those obtained by EIT.

关键词： electrical impedance lung injury ventilation vibration imaging

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