Nickel-manganese binary layered oxides with high working potential and low cost are potential candidates for sodium-ion batteries,but their electrochemical properties are highly related to compositional diversity.Dive...Nickel-manganese binary layered oxides with high working potential and low cost are potential candidates for sodium-ion batteries,but their electrochemical properties are highly related to compositional diversity.Diverse composite materials with various phase structures of P3,P2/P3,P2,P2/O3,and P2/P3/O3 were synthesized by manipulating the sodium content and calcination conditions,leading to the construction of a synthetic phase diagram for Na_(x)Ni_(0.25)Mn_(0.75)O_(2)(0.45≤x≤1.1).Then,we compared the electrochemical characteristics and structural evolution during the desodiation/sodiation process of P2,P2/P3,P2/03,and P2/P3/O3-Na_(x)Ni_(0.25)Mn_(0.75)O_(2).Among them,P2/P3-Na0.75Ni0.25Mn0.75O2exhibits the best rate capability of 90.9 mA h g^(-1)at 5 C,with an initial discharge capacity of 142.62 mA h g^(-1)at 0.1 C and a capacity retention rate of 78.25%after 100 cycles at 1 C in the voltage range of 2-4.3 V.The observed superior sodium storage performance of P2/P3 hybrids compared to other composite phases can be attributed to the enhanced Na^(+)transfer dynamic,reduction of the Jahn-teller effect,and improved reaction reversibility induced by the synergistic effect of P2 and P3 phases.The systematic research and exploration of phases in Na_(x)Ni_(0.25)Mn_(0.75)O_(2)provide new sights into high-performance nickel-manganese binary layered oxide for sodium-ion batteries.展开更多
Networked robots can perceive their surroundings, interact with each other or humans,and make decisions to accomplish specified tasks in remote/hazardous/complex environments. Satelliteunmanned aerial vehicle(UAV) net...Networked robots can perceive their surroundings, interact with each other or humans,and make decisions to accomplish specified tasks in remote/hazardous/complex environments. Satelliteunmanned aerial vehicle(UAV) networks can support such robots by providing on-demand communication services. However, under traditional open-loop communication paradigm, the network resources are usually divided into user-wise mostly-independent links,via ignoring the task-level dependency of robot collaboration. Thus, it is imperative to develop a new communication paradigm, taking into account the highlevel content and values behind, to facilitate multirobot operation. Inspired by Wiener’s Cybernetics theory, this article explores a closed-loop communication paradigm for the robot-oriented satellite-UAV network. This paradigm turns to handle group-wise structured links, so as to allocate resources in a taskoriented manner. It could also exploit the mobility of robots to liberate the network from full coverage,enabling new orchestration between network serving and positive mobility control of robots. Moreover,the integration of sensing, communications, computing and control would enlarge the benefit of this new paradigm. We present a case study for joint mobile edge computing(MEC) offloading and mobility control of robots, and finally outline potential challenges and open issues.展开更多
在服务业比重显著提高的现代经济体中,人力资本的积累不仅依赖教育、医疗等传统投入,对闲暇时间中非正规教育的依赖亦日益增长。通过引入有效闲暇及其“玩中学效应”(Learning by Playing),本文对上述现象进行了模型化构建,进而对传统...在服务业比重显著提高的现代经济体中,人力资本的积累不仅依赖教育、医疗等传统投入,对闲暇时间中非正规教育的依赖亦日益增长。通过引入有效闲暇及其“玩中学效应”(Learning by Playing),本文对上述现象进行了模型化构建,进而对传统人力资本理论进行扩展,更新了人力资本的经济增长效应。基于1995—2019年全球138个主要国家面板数据的实证结果显示,有效闲暇所引致的新人力资本通过提高劳动生产率可对经济发展产生显著的积极影响。本文的研究结论表明,高质量发展和闲暇增加后的经济增长之间存在积极的关联路径:技术进步和生活质量提高带来的居民闲暇增加经过优化配置,能塑造新人力资本、提升劳动生产率,进而有效助力我国经济实现高质量发展。展开更多
目的总结经胸骨上段小切口(ministernotomy,MS)进行A型主动脉夹层(type A aortic dissection,TAAD)手术的临床经验,探讨胸骨上段MS入路TAAD手术中的安全性及可靠性。方法2019年6月~2022年3月我中心接受胸骨上段MS进行TAAD手术病人35例,...目的总结经胸骨上段小切口(ministernotomy,MS)进行A型主动脉夹层(type A aortic dissection,TAAD)手术的临床经验,探讨胸骨上段MS入路TAAD手术中的安全性及可靠性。方法2019年6月~2022年3月我中心接受胸骨上段MS进行TAAD手术病人35例,收集病人一般资料、围术期数据及临床结果。经倾向性评分匹配(PSM)到同期在本中心接受了全胸骨切开(fullsternotomy,FS)的TAAD病人436例。PSM后纳入常规切口组70例。35例MS手术病人中,行升主动脉、全弓替换+降主动脉支架置入24例,行Bentall手术、全弓替换+降主动脉支架置入8例,David手术3例。结果35例手术均顺利完成,无中转延长切口,无术中死亡。术后二次开胸止血1例,术后急性肾功能衰竭行透析2例。均无术后胸骨哆开并发症,肺感染发生率低于常规开胸组。结论胸骨上段MS入路对于主动脉根部、升主动脉及弓降部显露良好,不明显增加手术时间、术后出血风险及围手术期不良事件发生率。展开更多
基金supported by project from the National Natural Science Foundation of China(21805018)by the Sichuan Science and Technology Program(2022ZHCG0018,2023NSFSC0117,2023ZHCG0060)+1 种基金the Yibin Science and Technology Program(2022JB005)project funded by the China Postdoctoral Science Foundation(2022M722704)。
文摘Nickel-manganese binary layered oxides with high working potential and low cost are potential candidates for sodium-ion batteries,but their electrochemical properties are highly related to compositional diversity.Diverse composite materials with various phase structures of P3,P2/P3,P2,P2/O3,and P2/P3/O3 were synthesized by manipulating the sodium content and calcination conditions,leading to the construction of a synthetic phase diagram for Na_(x)Ni_(0.25)Mn_(0.75)O_(2)(0.45≤x≤1.1).Then,we compared the electrochemical characteristics and structural evolution during the desodiation/sodiation process of P2,P2/P3,P2/03,and P2/P3/O3-Na_(x)Ni_(0.25)Mn_(0.75)O_(2).Among them,P2/P3-Na0.75Ni0.25Mn0.75O2exhibits the best rate capability of 90.9 mA h g^(-1)at 5 C,with an initial discharge capacity of 142.62 mA h g^(-1)at 0.1 C and a capacity retention rate of 78.25%after 100 cycles at 1 C in the voltage range of 2-4.3 V.The observed superior sodium storage performance of P2/P3 hybrids compared to other composite phases can be attributed to the enhanced Na^(+)transfer dynamic,reduction of the Jahn-teller effect,and improved reaction reversibility induced by the synergistic effect of P2 and P3 phases.The systematic research and exploration of phases in Na_(x)Ni_(0.25)Mn_(0.75)O_(2)provide new sights into high-performance nickel-manganese binary layered oxide for sodium-ion batteries.
基金supported in part by the National Key Research and Development Program of China (Grant No.2020YFA0711301)in part by the National Natural Science Foundation of China (Grant No.62341110 and U22A2002)in part by the Suzhou Science and Technology Project。
文摘Networked robots can perceive their surroundings, interact with each other or humans,and make decisions to accomplish specified tasks in remote/hazardous/complex environments. Satelliteunmanned aerial vehicle(UAV) networks can support such robots by providing on-demand communication services. However, under traditional open-loop communication paradigm, the network resources are usually divided into user-wise mostly-independent links,via ignoring the task-level dependency of robot collaboration. Thus, it is imperative to develop a new communication paradigm, taking into account the highlevel content and values behind, to facilitate multirobot operation. Inspired by Wiener’s Cybernetics theory, this article explores a closed-loop communication paradigm for the robot-oriented satellite-UAV network. This paradigm turns to handle group-wise structured links, so as to allocate resources in a taskoriented manner. It could also exploit the mobility of robots to liberate the network from full coverage,enabling new orchestration between network serving and positive mobility control of robots. Moreover,the integration of sensing, communications, computing and control would enlarge the benefit of this new paradigm. We present a case study for joint mobile edge computing(MEC) offloading and mobility control of robots, and finally outline potential challenges and open issues.
文摘在服务业比重显著提高的现代经济体中,人力资本的积累不仅依赖教育、医疗等传统投入,对闲暇时间中非正规教育的依赖亦日益增长。通过引入有效闲暇及其“玩中学效应”(Learning by Playing),本文对上述现象进行了模型化构建,进而对传统人力资本理论进行扩展,更新了人力资本的经济增长效应。基于1995—2019年全球138个主要国家面板数据的实证结果显示,有效闲暇所引致的新人力资本通过提高劳动生产率可对经济发展产生显著的积极影响。本文的研究结论表明,高质量发展和闲暇增加后的经济增长之间存在积极的关联路径:技术进步和生活质量提高带来的居民闲暇增加经过优化配置,能塑造新人力资本、提升劳动生产率,进而有效助力我国经济实现高质量发展。
文摘目的总结经胸骨上段小切口(ministernotomy,MS)进行A型主动脉夹层(type A aortic dissection,TAAD)手术的临床经验,探讨胸骨上段MS入路TAAD手术中的安全性及可靠性。方法2019年6月~2022年3月我中心接受胸骨上段MS进行TAAD手术病人35例,收集病人一般资料、围术期数据及临床结果。经倾向性评分匹配(PSM)到同期在本中心接受了全胸骨切开(fullsternotomy,FS)的TAAD病人436例。PSM后纳入常规切口组70例。35例MS手术病人中,行升主动脉、全弓替换+降主动脉支架置入24例,行Bentall手术、全弓替换+降主动脉支架置入8例,David手术3例。结果35例手术均顺利完成,无中转延长切口,无术中死亡。术后二次开胸止血1例,术后急性肾功能衰竭行透析2例。均无术后胸骨哆开并发症,肺感染发生率低于常规开胸组。结论胸骨上段MS入路对于主动脉根部、升主动脉及弓降部显露良好,不明显增加手术时间、术后出血风险及围手术期不良事件发生率。
