There has been a growing need for high specific power electrical machines for a wide range of applications.These include hybrid/electric traction applications,and aerospace applications.A lot of work has been done to ...There has been a growing need for high specific power electrical machines for a wide range of applications.These include hybrid/electric traction applications,and aerospace applications.A lot of work has been done to accomplish significantly higher specific power electrical machines especially for aerospace applications.Several machine topologies as well as thermal management schemes have been proposed.Even though there has been a few publications that provided an overview of high-speed and high specific power electrical machines[1-3],the goal of this paper is to provide a more comprehensive review of high specific power electrical machines with special focus on machines that have been built and tested and are considered the leading candidates defining the state-of-the art.Another key objective of this paper is to highlight the key“system-level”tradeoffs involved in pushing electrical machines to higher specific power.Focusing solely on the machine specific power can lead to a sub-optimal solution at the system-level.展开更多
Background: The functionality and the safety of the electric wheelchairs were essential for users’ everyday life. Some evidence indicated that the wheelchair Per Se highly influenced users’ occupational life, their ...Background: The functionality and the safety of the electric wheelchairs were essential for users’ everyday life. Some evidence indicated that the wheelchair Per Se highly influenced users’ occupational life, their personal identity and social life;further, the wheelchair became an extension of the body and more than a technical device. Besides, there was still both environmental and self-efficacy or/and mental health factors obstacles for full social participation. Even so, there was to some extent stigma related to being a wheelchair user. There was a need to reflect users’ perspective on being depended on electric wheelchair. The aim, accordingly, was to describe and to get a deeper insight into electric wheelchairs users’ perspective and experiences of utilizing this device;a qualitative design with an inductive approach was used. Method: Qualitative latent and interpretative content analysis [1] [2] was used after repeated face-to-face semi-structured interviews with three experienced Swedish electric wheelchair users during the autumn 2017. Findings: The findings showed a high degree of dependability of the assistants that supported the users, and of the quality of that working relationship. The findings were formulated, abstracted and interpreted in several steps. It showed one theme of meaning: “Living in a space shifting between potential violation of or respect for human dignity”. Conclusion: The study showed that electric wheelchair users were relatively content with their lives as well as with their devices in turns of mobility and accessibility, but the meaning of their narrations showed a life at constant risk of having the respect of human rights and human respect violated. Besides, the importance of having access to good and high quality devices, good staffing, and environmental support, all in concordance with human rights, the clinical and practical implications of this study narrows down to a question of encountering the other person as a whole and worthy individual.展开更多
The rapid evolution of electric vehicles(EVs)highlights the critical role of bat-tery technology in promoting sustainable transportation.This review offers a comprehensive introduction to the diverse landscape of batt...The rapid evolution of electric vehicles(EVs)highlights the critical role of bat-tery technology in promoting sustainable transportation.This review offers a comprehensive introduction to the diverse landscape of batteries for EVs.In particular,it examines the impressive array of available battery technologies,focusing on the predominance of lithium-based batteries,such as lithium-ion and lithium-metal variants.Additionally,it explores battery technologies beyond lithium(“post-lithium”),including aluminum,sodium,and magnesium batter-ies.The potential of solid-state batteries is also discussed,along with the current status of various battery types in EV applications.The review further addresses end-of-life treatment strategies for EV batteries,including reuse,remanufactur-ing,and recycling,which are essential for mitigating the environmental impact of batteries and ensuring sustainable lifecycle management.Finally,market per-spectives and potential future research directions for battery technologies in EVs are also discussed.展开更多
文摘There has been a growing need for high specific power electrical machines for a wide range of applications.These include hybrid/electric traction applications,and aerospace applications.A lot of work has been done to accomplish significantly higher specific power electrical machines especially for aerospace applications.Several machine topologies as well as thermal management schemes have been proposed.Even though there has been a few publications that provided an overview of high-speed and high specific power electrical machines[1-3],the goal of this paper is to provide a more comprehensive review of high specific power electrical machines with special focus on machines that have been built and tested and are considered the leading candidates defining the state-of-the art.Another key objective of this paper is to highlight the key“system-level”tradeoffs involved in pushing electrical machines to higher specific power.Focusing solely on the machine specific power can lead to a sub-optimal solution at the system-level.
文摘Background: The functionality and the safety of the electric wheelchairs were essential for users’ everyday life. Some evidence indicated that the wheelchair Per Se highly influenced users’ occupational life, their personal identity and social life;further, the wheelchair became an extension of the body and more than a technical device. Besides, there was still both environmental and self-efficacy or/and mental health factors obstacles for full social participation. Even so, there was to some extent stigma related to being a wheelchair user. There was a need to reflect users’ perspective on being depended on electric wheelchair. The aim, accordingly, was to describe and to get a deeper insight into electric wheelchairs users’ perspective and experiences of utilizing this device;a qualitative design with an inductive approach was used. Method: Qualitative latent and interpretative content analysis [1] [2] was used after repeated face-to-face semi-structured interviews with three experienced Swedish electric wheelchair users during the autumn 2017. Findings: The findings showed a high degree of dependability of the assistants that supported the users, and of the quality of that working relationship. The findings were formulated, abstracted and interpreted in several steps. It showed one theme of meaning: “Living in a space shifting between potential violation of or respect for human dignity”. Conclusion: The study showed that electric wheelchair users were relatively content with their lives as well as with their devices in turns of mobility and accessibility, but the meaning of their narrations showed a life at constant risk of having the respect of human rights and human respect violated. Besides, the importance of having access to good and high quality devices, good staffing, and environmental support, all in concordance with human rights, the clinical and practical implications of this study narrows down to a question of encountering the other person as a whole and worthy individual.
基金Natural Sciences and Engineering Research Council of Canada(NSERC)Fonds de Recherche du Quebec-Nature et Technologies(FRQNT)+3 种基金Centre Quebecois sur les Materiaux Fonctionnels(CQMF)Reseau Quebecois sur l’energie Intelligente(RQEI)Ecole de Technologie Superieure(ETS)Institut National de la Recherche Scientifique(INRS)。
文摘The rapid evolution of electric vehicles(EVs)highlights the critical role of bat-tery technology in promoting sustainable transportation.This review offers a comprehensive introduction to the diverse landscape of batteries for EVs.In particular,it examines the impressive array of available battery technologies,focusing on the predominance of lithium-based batteries,such as lithium-ion and lithium-metal variants.Additionally,it explores battery technologies beyond lithium(“post-lithium”),including aluminum,sodium,and magnesium batter-ies.The potential of solid-state batteries is also discussed,along with the current status of various battery types in EV applications.The review further addresses end-of-life treatment strategies for EV batteries,including reuse,remanufactur-ing,and recycling,which are essential for mitigating the environmental impact of batteries and ensuring sustainable lifecycle management.Finally,market per-spectives and potential future research directions for battery technologies in EVs are also discussed.
