Fiber-shaped supercapacitors(FSSCs)show great potential in portable and wearable electronics due to their unique advantages of high safety,environmental friendliness,high performances,outstanding flexibility and integ...Fiber-shaped supercapacitors(FSSCs)show great potential in portable and wearable electronics due to their unique advantages of high safety,environmental friendliness,high performances,outstanding flexibility and integrability.They can directly act as the power sources or be easily integrated with other flexible devices to constitute self-powered and sustainable energy suppliers,providing excellent adaptability to irregular surfaces.This review mainly summarizes the recently reported works of FSSCs including preparation methods of various fiber electrodes,construction strategies of FSSCs and multi-functional device integrations,exploration of reaction mechanisms and strategies to improve the electrochemical performance and provision of suggestions on further designing and optimization of FSSCs.Meanwhile,it shares our perspectives on challenges and opportunities in this field,shedding light on the development of high-performance fiber-shaped supercapacitors with multifunctions.展开更多
Aiming at solving the problems existing in the landscape planning of waterfront areas in Yichang City,such as the contradiction of traffic organization,the waste of historical space resources and the insufficient util...Aiming at solving the problems existing in the landscape planning of waterfront areas in Yichang City,such as the contradiction of traffic organization,the waste of historical space resources and the insufficient utilization of hydrological characteristics,systematic renewal strategies were proposed.Through empirical research and spatial behavioral analysis,a renewal paradigm of“ecological restoration-cultural inheritance-spatial creation”was constructed according to topographic texture and hydrological characteristics.The innovation lies in proposing a renewal model of vertical corridors that integrates“transportation,ecology and landscape”,as well as a three-dimensional transportation scheme for separating pedestrians and vehicles based on the theory of alleviating spatial ownership contradictions.This study provides a technical path for improving the functions of high-density urban waterfront areas and optimizing their spatial efficiency,and has a practical value for enhancing citizens’water-friendly experiences and promoting cultural and tourism economy.展开更多
With the rapid developments of the high-speed railway in China, a great number of long-span bridges have been constructed in order to cross rivers and gorges. At present, the longest main span of a constructed high-sp...With the rapid developments of the high-speed railway in China, a great number of long-span bridges have been constructed in order to cross rivers and gorges. At present, the longest main span of a constructed high-speed railway bridge is only 630 m. The main span of Hutong Yangtze River Bridge and of Wufengshan Yangtze River Bridge, which are under construction, will be much longer, at 1092 m each. In order to overcome the technical issues that originate from the extremely large dead loading and the relatively small structural stiffness of long-span high-speed railway bridges, many new technologies in bridge construction, design, materials, and so forth have been developed. This paper carefully reviews progress in the construction technologies of multi-function combined bridges in China, including com- bined highway and railway bridges and multi-track railway bridges. Innovations and practices regarding new types of bridge and composite bridge structures, such as bridges with three cable planes and three main trusses, inclined main trusses, slab-truss composite sections, and steel-concrete composite sections, are introduced. In addition, investigations into high-performance materials and integral fabrication and erection techniques for long-span railway bridges are summarized. At the end of the paper, prospects for the future development of long-span high-speed railwav bridges are provided.展开更多
With Globally Important Agricultural Heritage Systems(GIAHS)increasing in number around the world,their conservation has become a new international research theme.From the perspective of combining theoretical analyses...With Globally Important Agricultural Heritage Systems(GIAHS)increasing in number around the world,their conservation has become a new international research theme.From the perspective of combining theoretical analyses and practical case applications,this study examines the Important Agricultural Heritage Systems(IAHS)conservation pathways and operation mechanisms through industrial integration development(IID).First,the theoretical framework of IID in IAHS sites was constructed according to the requirements of IAHS conservation,which include analyses of the connotation and basic principles of IID,the necessity of IID for IAHS sites,the resource conditions,and the IID pathways.And then based on the theoretical framework,the IID of Longji Terraces in Guangxi,Honghe Hani Rice Terraces System in Yunnan(HHRTS),Aohan Dryland Farming System in Inner Mongolia(ADFS),and Huzhou Mulberry-dyke&Fish-pond System(HMFS)in Zhejiang are analyzed systematically.The main finding is that IID is an effective pathway for IAHS conservation.However,the IID in IAHS sites must stress the ecological and cultural values of the resources;IID should be based on local resource advantages;and IID should attach importance to the combination of different policies and coordination between different stakeholders.展开更多
We propose and investigate a methodology based on convolved electric and magnetic currents for the generation of multi-band responses over a space-shared radiating surface.First,a single wideband antenna operation pri...We propose and investigate a methodology based on convolved electric and magnetic currents for the generation of multi-band responses over a space-shared radiating surface.First,a single wideband antenna operation principle based on inter-leaved dipole and slot modes is studied and analyzed using full-wave simulations followed by a qualitative time domain analysis.Subsequently,a 2×2 dual-band radiating unit is conceived and developed by closely arranging single wideband antennas.In this case,multimode resonances are generated in a lower frequency band by a proper convolving and coupling of the magnetic and electric currents realized in the gaps between the antennas and on the surface of the antennas,respectively.This methodology can be deployed repeatedly to build up a self-scalable topology by reusing the electromagnetically(EM)connected radiating surfaces and gaps be-tween the radiating units.Due to the efficient reuse of the electromagnetic region for the development of multiband radiation,a high aperture-reuse efficiency is achieved.Finally,as a proof of concept,a 2×4 dual-band array operating in Ku-and Ka-bands is devel-oped and fabricated by a linear arrangement of the two developed radiating units.Our measurement results show that the proposed antenna array provides impedance and gain bandwidths of 30%and 25.4%in the Ku-band and 10.65%and 8.52%in the Ka-band,respectively.展开更多
In the post-Moore era,the development of active phased array antennas will inevitably trend towards active array microsystems.In this paper,the characteristics and composition of the active array antenna are briefly d...In the post-Moore era,the development of active phased array antennas will inevitably trend towards active array microsystems.In this paper,the characteristics and composition of the active array antenna are briefly described.Owing to the high efficiency,low profile,and light weight of the active array microsystems,the application prospects and advantages in the engineering of multi-functional airborne radar,spaceborne radar,and communication systems are analyzed.Moreover,according to the characteristics of the post-Moore era of integrated circuits,scientific and technological problems in the active array microsystems are presented,including multi-scale,multi-signal,and multi-physics field coupling.The challenges are also discussed,such as new architectures and algorithms,miniaturization of passive components,novel materials and processes,ultra-wideband technology,and new interdisciplinary technological applications.This paper is expected to inspire in-depth research on active array microsystems.展开更多
基金upported by the National Natural Science Foundation of China(No.21875226)the Science Fund for Distinguished Young Scholars of Sichuan Province(No.2017JQ0036)the Chengdu Rongpiao Talent plan,the Sichuan'Ten-thousand Talents Program",the"QianYingBaiTuan"Plan of China Mianyang Science City,the Science Foundation of Institute of Chemical Materials(No.O11100301)the"Global Experts Recruitment"program.
文摘Fiber-shaped supercapacitors(FSSCs)show great potential in portable and wearable electronics due to their unique advantages of high safety,environmental friendliness,high performances,outstanding flexibility and integrability.They can directly act as the power sources or be easily integrated with other flexible devices to constitute self-powered and sustainable energy suppliers,providing excellent adaptability to irregular surfaces.This review mainly summarizes the recently reported works of FSSCs including preparation methods of various fiber electrodes,construction strategies of FSSCs and multi-functional device integrations,exploration of reaction mechanisms and strategies to improve the electrochemical performance and provision of suggestions on further designing and optimization of FSSCs.Meanwhile,it shares our perspectives on challenges and opportunities in this field,shedding light on the development of high-performance fiber-shaped supercapacitors with multifunctions.
文摘Aiming at solving the problems existing in the landscape planning of waterfront areas in Yichang City,such as the contradiction of traffic organization,the waste of historical space resources and the insufficient utilization of hydrological characteristics,systematic renewal strategies were proposed.Through empirical research and spatial behavioral analysis,a renewal paradigm of“ecological restoration-cultural inheritance-spatial creation”was constructed according to topographic texture and hydrological characteristics.The innovation lies in proposing a renewal model of vertical corridors that integrates“transportation,ecology and landscape”,as well as a three-dimensional transportation scheme for separating pedestrians and vehicles based on the theory of alleviating spatial ownership contradictions.This study provides a technical path for improving the functions of high-density urban waterfront areas and optimizing their spatial efficiency,and has a practical value for enhancing citizens’water-friendly experiences and promoting cultural and tourism economy.
文摘With the rapid developments of the high-speed railway in China, a great number of long-span bridges have been constructed in order to cross rivers and gorges. At present, the longest main span of a constructed high-speed railway bridge is only 630 m. The main span of Hutong Yangtze River Bridge and of Wufengshan Yangtze River Bridge, which are under construction, will be much longer, at 1092 m each. In order to overcome the technical issues that originate from the extremely large dead loading and the relatively small structural stiffness of long-span high-speed railway bridges, many new technologies in bridge construction, design, materials, and so forth have been developed. This paper carefully reviews progress in the construction technologies of multi-function combined bridges in China, including com- bined highway and railway bridges and multi-track railway bridges. Innovations and practices regarding new types of bridge and composite bridge structures, such as bridges with three cable planes and three main trusses, inclined main trusses, slab-truss composite sections, and steel-concrete composite sections, are introduced. In addition, investigations into high-performance materials and integral fabrication and erection techniques for long-span railway bridges are summarized. At the end of the paper, prospects for the future development of long-span high-speed railwav bridges are provided.
基金The Agricultural Science and Technology Innovation Program (ASTIP-IAED-2021-06, STIP-IAED-2021-ZD-02)。
文摘With Globally Important Agricultural Heritage Systems(GIAHS)increasing in number around the world,their conservation has become a new international research theme.From the perspective of combining theoretical analyses and practical case applications,this study examines the Important Agricultural Heritage Systems(IAHS)conservation pathways and operation mechanisms through industrial integration development(IID).First,the theoretical framework of IID in IAHS sites was constructed according to the requirements of IAHS conservation,which include analyses of the connotation and basic principles of IID,the necessity of IID for IAHS sites,the resource conditions,and the IID pathways.And then based on the theoretical framework,the IID of Longji Terraces in Guangxi,Honghe Hani Rice Terraces System in Yunnan(HHRTS),Aohan Dryland Farming System in Inner Mongolia(ADFS),and Huzhou Mulberry-dyke&Fish-pond System(HMFS)in Zhejiang are analyzed systematically.The main finding is that IID is an effective pathway for IAHS conservation.However,the IID in IAHS sites must stress the ecological and cultural values of the resources;IID should be based on local resource advantages;and IID should attach importance to the combination of different policies and coordination between different stakeholders.
文摘We propose and investigate a methodology based on convolved electric and magnetic currents for the generation of multi-band responses over a space-shared radiating surface.First,a single wideband antenna operation principle based on inter-leaved dipole and slot modes is studied and analyzed using full-wave simulations followed by a qualitative time domain analysis.Subsequently,a 2×2 dual-band radiating unit is conceived and developed by closely arranging single wideband antennas.In this case,multimode resonances are generated in a lower frequency band by a proper convolving and coupling of the magnetic and electric currents realized in the gaps between the antennas and on the surface of the antennas,respectively.This methodology can be deployed repeatedly to build up a self-scalable topology by reusing the electromagnetically(EM)connected radiating surfaces and gaps be-tween the radiating units.Due to the efficient reuse of the electromagnetic region for the development of multiband radiation,a high aperture-reuse efficiency is achieved.Finally,as a proof of concept,a 2×4 dual-band array operating in Ku-and Ka-bands is devel-oped and fabricated by a linear arrangement of the two developed radiating units.Our measurement results show that the proposed antenna array provides impedance and gain bandwidths of 30%and 25.4%in the Ku-band and 10.65%and 8.52%in the Ka-band,respectively.
基金Project supported by the National Natural Science Foundation of China(No.92373115)the Natural Science Foundation of Anhui Province,China(No.2308085MF193)+2 种基金the Major Natural Science Project of Anhui Provincial Education Department,China(No.KJ2021ZD0003)the Key Research and Development Project of Anhui Province,China(No.2023n06020026)the Innovation and Entrepreneurship of Anhui Province,China(No.Z020118060)。
文摘In the post-Moore era,the development of active phased array antennas will inevitably trend towards active array microsystems.In this paper,the characteristics and composition of the active array antenna are briefly described.Owing to the high efficiency,low profile,and light weight of the active array microsystems,the application prospects and advantages in the engineering of multi-functional airborne radar,spaceborne radar,and communication systems are analyzed.Moreover,according to the characteristics of the post-Moore era of integrated circuits,scientific and technological problems in the active array microsystems are presented,including multi-scale,multi-signal,and multi-physics field coupling.The challenges are also discussed,such as new architectures and algorithms,miniaturization of passive components,novel materials and processes,ultra-wideband technology,and new interdisciplinary technological applications.This paper is expected to inspire in-depth research on active array microsystems.
