Due to the continuously increasing demand for building materials across the world,it is necessary to use renewable materials in place of the existing nonrenewable materials in construction projects.Bamboo is a fast-gr...Due to the continuously increasing demand for building materials across the world,it is necessary to use renewable materials in place of the existing nonrenewable materials in construction projects.Bamboo is a fast-growing flowering plant that may be used as a renewable material in construction.The use of bamboo in the construction of buildings can improve its long-term carbon fixation capacity and economic benefits.Although bamboo has the advantages of superior performance,low carbon content,high energy-saving and emission-reducing capacity,bamboo is an anisotropic material,which has many factors affecting its material performance,large variability of material performance,lack of systematic research,and the use of bamboo as the main building material is not always limited.This paper systematically summarizes the research status of bamboo as a building material from the aspects of bamboo composition,gradation,material properties,bamboo building components,connection nodes,and use of artificial boards.On this basis,some constructive suggestions are put forward for the further study of bamboo in the field of architecture.展开更多
Reconfigurable photonic integrated circuits(PICs)can implement arbitrary operations and signal processing functionalities directly in the optical domain.Run-time configuration of these circuits requires an electronic ...Reconfigurable photonic integrated circuits(PICs)can implement arbitrary operations and signal processing functionalities directly in the optical domain.Run-time configuration of these circuits requires an electronic control layer to adjust the working point of their building elements and compensate for thermal drifts or degradations of the input signal.As the advancement of photonic foundries enables the fabrication of chips of increasing complexity,developing scalable electronic controllers becomes crucial for the operation of complex PICs.In this paper,we present an electronic application-specific integrated circuit(ASIC)designed for reconfiguration of PICs featuring numerous tunable elements.Each channel of the ASIC controller independently addresses one optical component of the PIC,and multiple parallel local feedback loops are operated to achieve full control.The proposed design is validated through real-time reconfiguration of a 16-channel silicon photonics adaptive universal beam coupler.Results demonstrate automatic coupling of an arbitrary input beam to a single-mode waveguide,dynamic compensation of beam wavefront distortions and successful transmission of a 50 Gbit/s signal through an optical free-space link.The low power consumption and compactness of the electronic chip provide a scalable paradigm that can be seamlessly extended to larger photonic architectures.展开更多
基金We thank Jiangsu Province High-level Talent Selection Training(JNHB-127)the National Key R&D Program of China(2017YFC0703501)+4 种基金the National Natural Science Foundation of China(51878590)Jiangsu Provincial Department of Housing and construction(2019ZD092)the Natural Science Foundation of Jiangsu Province(Grant Nos.BK20170926 and BK20150878)the Yangzhou Science and Technology Project(YZ2019047)College Research Project(2019xjzk014)for their funding.
文摘Due to the continuously increasing demand for building materials across the world,it is necessary to use renewable materials in place of the existing nonrenewable materials in construction projects.Bamboo is a fast-growing flowering plant that may be used as a renewable material in construction.The use of bamboo in the construction of buildings can improve its long-term carbon fixation capacity and economic benefits.Although bamboo has the advantages of superior performance,low carbon content,high energy-saving and emission-reducing capacity,bamboo is an anisotropic material,which has many factors affecting its material performance,large variability of material performance,lack of systematic research,and the use of bamboo as the main building material is not always limited.This paper systematically summarizes the research status of bamboo as a building material from the aspects of bamboo composition,gradation,material properties,bamboo building components,connection nodes,and use of artificial boards.On this basis,some constructive suggestions are put forward for the further study of bamboo in the field of architecture.
基金supported by the Italian National Recovery and Resilience Plan(NRRP)of Nex tGeneration EU,partnership on“Telecommunications of the Future”(Program“RESTART”,Structural Project“Rigoletto,”and Focused Project“HePIC”)under Grant PE00000001.We thank Polifab,the nanofabrication facility of Politecnico di Milano,for dicing and wire-bonding the chips.
文摘Reconfigurable photonic integrated circuits(PICs)can implement arbitrary operations and signal processing functionalities directly in the optical domain.Run-time configuration of these circuits requires an electronic control layer to adjust the working point of their building elements and compensate for thermal drifts or degradations of the input signal.As the advancement of photonic foundries enables the fabrication of chips of increasing complexity,developing scalable electronic controllers becomes crucial for the operation of complex PICs.In this paper,we present an electronic application-specific integrated circuit(ASIC)designed for reconfiguration of PICs featuring numerous tunable elements.Each channel of the ASIC controller independently addresses one optical component of the PIC,and multiple parallel local feedback loops are operated to achieve full control.The proposed design is validated through real-time reconfiguration of a 16-channel silicon photonics adaptive universal beam coupler.Results demonstrate automatic coupling of an arbitrary input beam to a single-mode waveguide,dynamic compensation of beam wavefront distortions and successful transmission of a 50 Gbit/s signal through an optical free-space link.The low power consumption and compactness of the electronic chip provide a scalable paradigm that can be seamlessly extended to larger photonic architectures.
