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
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
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.
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.
