The Hong Kong Research Institute of Textiles and Apparel(hereinafter referred to as"HKRITA")and Seiko Epson Corporation(hereinafter referred to as"Epson")have succeeded in developing new regenerate...The Hong Kong Research Institute of Textiles and Apparel(hereinafter referred to as"HKRITA")and Seiko Epson Corporation(hereinafter referred to as"Epson")have succeeded in developing new regenerated cellulose fiber with a silk-like sheen from waste cotton fabric through a new production process.A movement toward using fibers recycled from discarded clothing has been gaining momentum,driven by a growing recognition of waste clothing as a global environmental issue.In Europe in particular,a move is under way to use more regenerated fiber and reduce textile waste.展开更多
The design and preparation of outstanding catalysts are significant for the electrocatalytic oxygen evolution reaction(OER),which performs a crucial function in electrochemical water splitting.Herein,we have prepared ...The design and preparation of outstanding catalysts are significant for the electrocatalytic oxygen evolution reaction(OER),which performs a crucial function in electrochemical water splitting.Herein,we have prepared metal–organic framework(MOF)nanosheets on a nickel foam(NF)substrate via a two-step procedure including a hydrothermal reaction and an in situ transformation process.As for the anodic OER process,the obtained NiFe-MOF@NF demonstrates excellent catalytic performance with a small overpotential of 265 mV to reach a current density of 10 mA cm^(−2),and impressive long-term catalytic durability and stability without obvious deactivation.The superior electrocatalytic performance of the obtained NiFe-MOF@NF material is mainly due to the substantial active metal centres,enhanced electrical conductivity and favorable kinetics.We believe that the strategy will be of great benefit to the development of highly efficient metal electrocatalysts,and will pave the way for the application of metal catalysts in the OER.展开更多
Significant capacity degradation and a dramatic volume change call for effective strategies to address the intrinsic issues of transition metal oxide anodes of lithium-ion batteries.Rational nanostructural design has ...Significant capacity degradation and a dramatic volume change call for effective strategies to address the intrinsic issues of transition metal oxide anodes of lithium-ion batteries.Rational nanostructural design has shown great promise in improving structural stability and electrochemical performance.We here report the fabrication of hollow nanoparticle-assembled hierarchical NiCo_(2)O_(4)nanofibers via a facile elec-trospining technique and annealing process.A set of control experiments and systematic characterization demonstrate that the presence of polymers and an appropriate annealing procedure are key to form a novel nanostructured anode.The hollow nanostructure and abundant mesopores centered at about 20 nm in the nanofibers could effectively suppress severe volume variations in the lithiation/delithiation process.Furthermore,the novel nanoparticle-nanofiber hierarchical architecture could shorten the lithium diffusion length,increase the contact areas between the electrode and electrolyte,and accord-ingly promote fast electron/charge transfer.As expected,the optimized hierarchical NiCo_(2)O_(4)nanofibers exhibit excellent performance for Li-ion batteries,delivering a capacity of 926.2 mA h g^(−1)at 0.1 A g^(−1)and 687 mA h g^(−1)at a high current density of 2 A g^(−1).This work may provide an attractive and promising strat-egy for advancing transition metal oxide anodes.展开更多
The authors regret that,during the preparation of the figures,a transmission electron microscopy(TEM)image of the rat sciatic nerve was mistakenly used.The fluorescence image(Fig.4a)of the rat sciatic nerve cross-sect...The authors regret that,during the preparation of the figures,a transmission electron microscopy(TEM)image of the rat sciatic nerve was mistakenly used.The fluorescence image(Fig.4a)of the rat sciatic nerve cross-section for the Alg/SF group was incorrectly selected from the Alg-Mg/SF group.These errors occurred during the figure assembly process,as the original image files for multiple experimental conditions were stored in the same folder without distinct subcategories.This led to the unintentional selection of images from similar but unrelated sample sets.展开更多
In the originally published version of this paper,the images for GR5-YC+RGG1-YN and GR5-YC+GGC2-YN in Figure 4B were inadvertent duplicates due to an oversight during the figure assembly process.A corrected Figure 4B,...In the originally published version of this paper,the images for GR5-YC+RGG1-YN and GR5-YC+GGC2-YN in Figure 4B were inadvertent duplicates due to an oversight during the figure assembly process.A corrected Figure 4B,in which the panel for GR5-YC+RGG1-YN has been replaced with the correct image,is presented below,and the original article has been updated online.展开更多
China is in the process of drafting its 15th Five-Year Plan for National Economic and Social Development covering the period of 2026-30.The dcx:ument will serve as one of the major roadmaps toward China's goal of ...China is in the process of drafting its 15th Five-Year Plan for National Economic and Social Development covering the period of 2026-30.The dcx:ument will serve as one of the major roadmaps toward China's goal of mcxlemization by 2035.As part of the drafting process,a one-month online public consultation began on May 20,with the collected opinions and suggestions to be summarized and provided as reference for decision-making by the central leadership.展开更多
In this work,a reflective metasurface connector(RMC)and its application for high-density and wideband spacedivision multiplexing(SDM)are demonstrated.This device features single facet metasurface fabrication over an S...In this work,a reflective metasurface connector(RMC)and its application for high-density and wideband spacedivision multiplexing(SDM)are demonstrated.This device features single facet metasurface fabrication over an SOI platform based on a CMOS compatible process.A minimum fiber-to-fiber insertion loss of 2.9 dB at 1598.24 nm is realized for fan-in-fan-out(FIFO)applications between a single-mode fiber(SMF)array and a multicore fiber(MCF).展开更多
Quickly and accurately obtaining the internal temperature distribution of a transformer plays a key role in predicting its operating conditions and simplifying the maintenance process.A reasonable equivalent thermal c...Quickly and accurately obtaining the internal temperature distribution of a transformer plays a key role in predicting its operating conditions and simplifying the maintenance process.A reasonable equivalent thermal circuit model is a relatively reliable method of obtaining the internal temperature distribution.However,thermal circuit models without targeted consideration of operating conditions and parameter corrections usually limit the accuracy of the results.This paper proposed a five-node transient thermal circuit model with the introduction of nonlinear thermal resistance,which considered the internal structure and winding layout of the core-type high-frequency transformer.The Nusselt number,a crucial variable in heat convection calculations and directly related to the accuracy of thermal resistance parameters,was calibrated on the basis of the distribution of external cooling air.After parameter calibration,the maximum computational error of the hotspot temperature is reduced by 5.48%compared with that of the uncalibrated model.Finally,an experimental platform for temperature monitoring was established to validate the five-node model and its ability to track the temperature change at each reference point after calibrating the Nusselt number.展开更多
文摘The Hong Kong Research Institute of Textiles and Apparel(hereinafter referred to as"HKRITA")and Seiko Epson Corporation(hereinafter referred to as"Epson")have succeeded in developing new regenerated cellulose fiber with a silk-like sheen from waste cotton fabric through a new production process.A movement toward using fibers recycled from discarded clothing has been gaining momentum,driven by a growing recognition of waste clothing as a global environmental issue.In Europe in particular,a move is under way to use more regenerated fiber and reduce textile waste.
基金support from National Natural Science Foundation of China(51972064).
文摘The design and preparation of outstanding catalysts are significant for the electrocatalytic oxygen evolution reaction(OER),which performs a crucial function in electrochemical water splitting.Herein,we have prepared metal–organic framework(MOF)nanosheets on a nickel foam(NF)substrate via a two-step procedure including a hydrothermal reaction and an in situ transformation process.As for the anodic OER process,the obtained NiFe-MOF@NF demonstrates excellent catalytic performance with a small overpotential of 265 mV to reach a current density of 10 mA cm^(−2),and impressive long-term catalytic durability and stability without obvious deactivation.The superior electrocatalytic performance of the obtained NiFe-MOF@NF material is mainly due to the substantial active metal centres,enhanced electrical conductivity and favorable kinetics.We believe that the strategy will be of great benefit to the development of highly efficient metal electrocatalysts,and will pave the way for the application of metal catalysts in the OER.
基金supported by the National Science Foundation of China(No.51977009,11774027,51372282,51132002).
文摘Significant capacity degradation and a dramatic volume change call for effective strategies to address the intrinsic issues of transition metal oxide anodes of lithium-ion batteries.Rational nanostructural design has shown great promise in improving structural stability and electrochemical performance.We here report the fabrication of hollow nanoparticle-assembled hierarchical NiCo_(2)O_(4)nanofibers via a facile elec-trospining technique and annealing process.A set of control experiments and systematic characterization demonstrate that the presence of polymers and an appropriate annealing procedure are key to form a novel nanostructured anode.The hollow nanostructure and abundant mesopores centered at about 20 nm in the nanofibers could effectively suppress severe volume variations in the lithiation/delithiation process.Furthermore,the novel nanoparticle-nanofiber hierarchical architecture could shorten the lithium diffusion length,increase the contact areas between the electrode and electrolyte,and accord-ingly promote fast electron/charge transfer.As expected,the optimized hierarchical NiCo_(2)O_(4)nanofibers exhibit excellent performance for Li-ion batteries,delivering a capacity of 926.2 mA h g^(−1)at 0.1 A g^(−1)and 687 mA h g^(−1)at a high current density of 2 A g^(−1).This work may provide an attractive and promising strat-egy for advancing transition metal oxide anodes.
基金supported by National Natural Science Foundation of China(32230057,32271385,32371400)Natural Science Foundation of Jiangsu Province(BK20231338)the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)(21KJA430011).
文摘The authors regret that,during the preparation of the figures,a transmission electron microscopy(TEM)image of the rat sciatic nerve was mistakenly used.The fluorescence image(Fig.4a)of the rat sciatic nerve cross-section for the Alg/SF group was incorrectly selected from the Alg-Mg/SF group.These errors occurred during the figure assembly process,as the original image files for multiple experimental conditions were stored in the same folder without distinct subcategories.This led to the unintentional selection of images from similar but unrelated sample sets.
文摘In the originally published version of this paper,the images for GR5-YC+RGG1-YN and GR5-YC+GGC2-YN in Figure 4B were inadvertent duplicates due to an oversight during the figure assembly process.A corrected Figure 4B,in which the panel for GR5-YC+RGG1-YN has been replaced with the correct image,is presented below,and the original article has been updated online.
文摘China is in the process of drafting its 15th Five-Year Plan for National Economic and Social Development covering the period of 2026-30.The dcx:ument will serve as one of the major roadmaps toward China's goal of mcxlemization by 2035.As part of the drafting process,a one-month online public consultation began on May 20,with the collected opinions and suggestions to be summarized and provided as reference for decision-making by the central leadership.
基金National Key Research and Development Program of China(2023YFB2905502)Explorers Program of Shanghai(Basic Research Funding)(24TS1401000)。
文摘In this work,a reflective metasurface connector(RMC)and its application for high-density and wideband spacedivision multiplexing(SDM)are demonstrated.This device features single facet metasurface fabrication over an SOI platform based on a CMOS compatible process.A minimum fiber-to-fiber insertion loss of 2.9 dB at 1598.24 nm is realized for fan-in-fan-out(FIFO)applications between a single-mode fiber(SMF)array and a multicore fiber(MCF).
基金supported by the National Natural Science Foundation of China(Grant 52207180)Xi'an High Voltage Apparatus Research Institute Co.Ltd.(Grant K222301-01)the Anhui Provincial Natural Science Foundation(Grant 2208085UD18).
文摘Quickly and accurately obtaining the internal temperature distribution of a transformer plays a key role in predicting its operating conditions and simplifying the maintenance process.A reasonable equivalent thermal circuit model is a relatively reliable method of obtaining the internal temperature distribution.However,thermal circuit models without targeted consideration of operating conditions and parameter corrections usually limit the accuracy of the results.This paper proposed a five-node transient thermal circuit model with the introduction of nonlinear thermal resistance,which considered the internal structure and winding layout of the core-type high-frequency transformer.The Nusselt number,a crucial variable in heat convection calculations and directly related to the accuracy of thermal resistance parameters,was calibrated on the basis of the distribution of external cooling air.After parameter calibration,the maximum computational error of the hotspot temperature is reduced by 5.48%compared with that of the uncalibrated model.Finally,an experimental platform for temperature monitoring was established to validate the five-node model and its ability to track the temperature change at each reference point after calibrating the Nusselt number.
