LM launch vehicles established a new record by successfully performing the 16th successful flight this year.A LM-3A launched the 10th BeiDou 2 satellite into its predetermined transfer orbit on December 2 from the XSL...LM launch vehicles established a new record by successfully performing the 16th successful flight this year.A LM-3A launched the 10th BeiDou 2 satellite into its predetermined transfer orbit on December 2 from the XSLC in Sichuan Province.展开更多
The aerospace industry is a very unforgiving field, where even the smallest error could have catastrophic consequences.To reduce the risk of disaster, multiple systems are put into place to provide accurate informatio...The aerospace industry is a very unforgiving field, where even the smallest error could have catastrophic consequences.To reduce the risk of disaster, multiple systems are put into place to provide accurate information for informed decisionmaking. The field of optics has played a pivotal role in advancing space exploration and technology. From enabling preciseobservations of distant celestial objects to facilitating communication across vast interstellar distances, optics hasbecome an indispensable tool in space science and supported by significant advances in the last few years, new and improvedapplications continue to arise. This review aims to explore the diverse applications of optical systems and technologiesin the aerospace industry, highlighting recent developments regarding navigation, communications, process andstructural health monitoring, as well as the monitorization of astronauts' health.展开更多
Relative navigation is a key enabling technology for space missions such as on-orbit servicing and space situational awareness.Given that there are several special advantages of space relative navigation using angles-...Relative navigation is a key enabling technology for space missions such as on-orbit servicing and space situational awareness.Given that there are several special advantages of space relative navigation using angles-only measurements from passive optical sensors,angles-only relative navigation is considered as one of the best potential approaches in the field of space relative navigation.However,angles-only relative navigation is well-known for its range observability problem.To overcome this observability problem,many studies have been conducted over the past decades.In this study,we present a comprehensive review of state-of-the-art space relative navigation based on angles-only measurements.The emphasis is on the observability problem and solutions to angles-only relative navigation,where the review of the solutions is categorized into four classes based on the intrinsic principle:complicated dynamics approach,multi-line of sight(multi-LOS)approach,sensor offset center-of-mass approach,and orbit maneuver approach.Then,the fight demonstration results of angles-only relative navigation in the two projects are briefly reviewed.Finally,conclusions of this study and recommendations for further research are presented.展开更多
Viruses have evolved diverse strategies to propagate between cells.Classical paradigms describe two primary transmission modes:cell-free diffusion,where virions navigate extracellular spaces to initiate new infections...Viruses have evolved diverse strategies to propagate between cells.Classical paradigms describe two primary transmission modes:cell-free diffusion,where virions navigate extracellular spaces to initiate new infections,and direct cell-to-cell spread that minimizes exposure to host immunity[1,2].In recent years,a third mechanism has emerged wherein viruses exploit extracellular vesicles(EVs)as intercellular transmission carriers.Diverse EV subtypes,including exosomes,secretory lysosomes,and apoptotic bodies,have been shown to encapsulate clusters of viral particles for intercellular transmission[3].However,the full repertoire of vesicle-mediated viral spread remains incompletely cataloged,particularly regarding heterogenous structures with specialized biogenesis pathways.展开更多
文摘LM launch vehicles established a new record by successfully performing the 16th successful flight this year.A LM-3A launched the 10th BeiDou 2 satellite into its predetermined transfer orbit on December 2 from the XSLC in Sichuan Province.
基金funded by National Funds through the Portuguese Science and Technology Foundation(FCT I.P.)under the scope of the project CICECO(LA/P/0006/2020,UIDB/50011/2020,UIDP/50011/2020)The research was co-funded by the financial support of the European Union under the REFRESH–Research Excellence For Region Sustainability and High-tech Industries project number CZ.10.03.01/00/22_003/0000048 via the Operational Programme Just Transitionsupported by the Ministry of Education,Youth,and Sports of the Czech Republic conducted by the VSB-Technical University of Ostrava,under grants no.SP2025/039 and SP2025/021.
文摘The aerospace industry is a very unforgiving field, where even the smallest error could have catastrophic consequences.To reduce the risk of disaster, multiple systems are put into place to provide accurate information for informed decisionmaking. The field of optics has played a pivotal role in advancing space exploration and technology. From enabling preciseobservations of distant celestial objects to facilitating communication across vast interstellar distances, optics hasbecome an indispensable tool in space science and supported by significant advances in the last few years, new and improvedapplications continue to arise. This review aims to explore the diverse applications of optical systems and technologiesin the aerospace industry, highlighting recent developments regarding navigation, communications, process andstructural health monitoring, as well as the monitorization of astronauts' health.
基金supported by the National Natural Science Foundation of China(12272168,11802119)Foundation of Science and Technology on Space Intelligent Control Laboratory(6142208200303,2021-JCJQ-LB-010-04).
文摘Relative navigation is a key enabling technology for space missions such as on-orbit servicing and space situational awareness.Given that there are several special advantages of space relative navigation using angles-only measurements from passive optical sensors,angles-only relative navigation is considered as one of the best potential approaches in the field of space relative navigation.However,angles-only relative navigation is well-known for its range observability problem.To overcome this observability problem,many studies have been conducted over the past decades.In this study,we present a comprehensive review of state-of-the-art space relative navigation based on angles-only measurements.The emphasis is on the observability problem and solutions to angles-only relative navigation,where the review of the solutions is categorized into four classes based on the intrinsic principle:complicated dynamics approach,multi-line of sight(multi-LOS)approach,sensor offset center-of-mass approach,and orbit maneuver approach.Then,the fight demonstration results of angles-only relative navigation in the two projects are briefly reviewed.Finally,conclusions of this study and recommendations for further research are presented.
基金supported by the Ministry of Science and Technology of the People’s Republic of China(2022ZD0212900)the National Natural Science Foundation of China(32300570)+3 种基金the Beijing Natural Science Foundation(5244036)the National Key Research and Development Program of China(2023YFF0613402)the Clinical Medicine Plus X-Young Scholars Project of Peking University(PKU2025PKULCXQ013)the Research Funds from Health@InnoHK Program launched by Innovation Technology Commission of the Hong Kong Special Administrative Region.
文摘Viruses have evolved diverse strategies to propagate between cells.Classical paradigms describe two primary transmission modes:cell-free diffusion,where virions navigate extracellular spaces to initiate new infections,and direct cell-to-cell spread that minimizes exposure to host immunity[1,2].In recent years,a third mechanism has emerged wherein viruses exploit extracellular vesicles(EVs)as intercellular transmission carriers.Diverse EV subtypes,including exosomes,secretory lysosomes,and apoptotic bodies,have been shown to encapsulate clusters of viral particles for intercellular transmission[3].However,the full repertoire of vesicle-mediated viral spread remains incompletely cataloged,particularly regarding heterogenous structures with specialized biogenesis pathways.
