The corrosion rate is a crucial factor that impacts the longevity of materials in different applications.After undergoing friction stir processing(FSP),the refined grain structure leads to a notable decrease in corros...The corrosion rate is a crucial factor that impacts the longevity of materials in different applications.After undergoing friction stir processing(FSP),the refined grain structure leads to a notable decrease in corrosion rate.However,a better understanding of the correlation between the FSP process parameters and the corrosion rate is still lacking.The current study used machine learning to establish the relationship between the corrosion rate and FSP process parameters(rotational speed,traverse speed,and shoulder diameter)for WE43 alloy.The Taguchi L27 design of experiments was used for the experimental analysis.In addition,synthetic data was generated using particle swarm optimization for virtual sample generation(VSG).The application of VSG has led to an increase in the prediction accuracy of machine learning models.A sensitivity analysis was performed using Shapley Additive Explanations to determine the key factors affecting the corrosion rate.The shoulder diameter had a significant impact in comparison to the traverse speed.A graphical user interface(GUI)has been created to predict the corrosion rate using the identified factors.This study focuses on the WE43 alloy,but its findings can also be used to predict the corrosion rate of other magnesium alloys.展开更多
We have defined the environmental interface through the exchange processes between media forming this interface. Considering the environmental interface as a complex system we elaborated the advanced mathematical tool...We have defined the environmental interface through the exchange processes between media forming this interface. Considering the environmental interface as a complex system we elaborated the advanced mathematical tools for its modelling. We have suggested two coupled maps serving the exchange processes on the environmental interfaces spatially ranged from cellular to planetary level, i.e. 1) the map with diffusive coupling for energy exchange simulation and 2) the map with affinity, which is suitable for matter exchange processes at the cellular level. We have performed the dynamical analysis of the coupled maps using the Lyapunov exponent, cross sample as well as the permutation entropy in dependence on different map parameters. Finally, we discussed the map with affinity, which shows some features making it a promising toll in simulation of exchange processes on the environmental interface at the cellular level.展开更多
This paper focuses on the space charge and breakdown characteristics of polypropylene(PP)-based insulation interface in extrusion moulded joint(EMJ)for high-voltage direct current(HVDC)submarine cables.The double-laye...This paper focuses on the space charge and breakdown characteristics of polypropylene(PP)-based insulation interface in extrusion moulded joint(EMJ)for high-voltage direct current(HVDC)submarine cables.The double-layered flat samples and cylindrical samples are prepared to imitate the interface in the PP-insulated EMJ.The DC conductivity,space charge,and breakdown strength are tested.The results demonstrate that in the EMJ manufacturing process,the lower wielding temperature leads to microdefects at the insulation interface.As shallow traps,the microdefects exacerbate hetero charge accumulation,thereby intensifying the electric field distortion and increasing the conductivity.Meanwhile,the interfacial microdefects lead to a reduction in the insulation breakdown strength.At 90°C,the normal and tangential breakdown strengths decrease by a maximum of 20.6%and 54.5%,respectively.Notably,the space charges and microdefects lead to a rapid decline in the breakdown strength after hetero polarity pre-stressing.Especially for the tangential breakdown strength,the maximum decrease rate reaches 22.9%.Therefore,the interfacial microdefects caused by the drop in the welding temperature are the primary factors leading to a serious decrease in the electrical properties of EMJ insulation,making the EMJ insulation weaker than PP cable insulation.展开更多
变电站Web发布系统实现了变电站远程监视功能，其中还包括保护定值、采样值和录波波形等信息的查看。文章介绍了CSC2000变电站监控系统中变电站Web发布系统的功能和实现方法，它采用B/S(Browser/Server)结构，其远程浏览功能可以灵活地...变电站Web发布系统实现了变电站远程监视功能，其中还包括保护定值、采样值和录波波形等信息的查看。文章介绍了CSC2000变电站监控系统中变电站Web发布系统的功能和实现方法，它采用B/S(Browser/Server)结构，其远程浏览功能可以灵活地嵌入电力管理信息系统(Management Information System, MIS)，具有使用灵活方便、安全性高的特点，可以作为变电站运行监视的有益补充。展开更多
基于CSMC0.5um CMOS工艺,给出了一款3轴电容式微加速度计接口ASIC的详细设计方案。利用时分复用技术实现了使用同一电路模块同时检测3个轴向的加速度信号,利用相关双倍采样技术提高了电容电压转换的分辨率,利用Sigma_Delta调制技术对电...基于CSMC0.5um CMOS工艺,给出了一款3轴电容式微加速度计接口ASIC的详细设计方案。利用时分复用技术实现了使用同一电路模块同时检测3个轴向的加速度信号,利用相关双倍采样技术提高了电容电压转换的分辨率,利用Sigma_Delta调制技术对电路噪声进行有效整形。仿真得到系统的分辨率为0.91 a F/Hz1/2,3个轴向的噪声密度分别为43.60μg/Hz1/2、43.60μg/Hz1/2和45.70μg/Hz1/2,3个轴向输出数字脉冲信号占空比的非线性度分别为1.38%、0.91%和1.79%。展开更多
文摘The corrosion rate is a crucial factor that impacts the longevity of materials in different applications.After undergoing friction stir processing(FSP),the refined grain structure leads to a notable decrease in corrosion rate.However,a better understanding of the correlation between the FSP process parameters and the corrosion rate is still lacking.The current study used machine learning to establish the relationship between the corrosion rate and FSP process parameters(rotational speed,traverse speed,and shoulder diameter)for WE43 alloy.The Taguchi L27 design of experiments was used for the experimental analysis.In addition,synthetic data was generated using particle swarm optimization for virtual sample generation(VSG).The application of VSG has led to an increase in the prediction accuracy of machine learning models.A sensitivity analysis was performed using Shapley Additive Explanations to determine the key factors affecting the corrosion rate.The shoulder diameter had a significant impact in comparison to the traverse speed.A graphical user interface(GUI)has been created to predict the corrosion rate using the identified factors.This study focuses on the WE43 alloy,but its findings can also be used to predict the corrosion rate of other magnesium alloys.
文摘We have defined the environmental interface through the exchange processes between media forming this interface. Considering the environmental interface as a complex system we elaborated the advanced mathematical tools for its modelling. We have suggested two coupled maps serving the exchange processes on the environmental interfaces spatially ranged from cellular to planetary level, i.e. 1) the map with diffusive coupling for energy exchange simulation and 2) the map with affinity, which is suitable for matter exchange processes at the cellular level. We have performed the dynamical analysis of the coupled maps using the Lyapunov exponent, cross sample as well as the permutation entropy in dependence on different map parameters. Finally, we discussed the map with affinity, which shows some features making it a promising toll in simulation of exchange processes on the environmental interface at the cellular level.
基金National Natural Science Foundation of China under the Grant 52477151 and 52077148Key Science and Technology Programme of Yunnan Province,China under Grant 202202AC080002.
文摘This paper focuses on the space charge and breakdown characteristics of polypropylene(PP)-based insulation interface in extrusion moulded joint(EMJ)for high-voltage direct current(HVDC)submarine cables.The double-layered flat samples and cylindrical samples are prepared to imitate the interface in the PP-insulated EMJ.The DC conductivity,space charge,and breakdown strength are tested.The results demonstrate that in the EMJ manufacturing process,the lower wielding temperature leads to microdefects at the insulation interface.As shallow traps,the microdefects exacerbate hetero charge accumulation,thereby intensifying the electric field distortion and increasing the conductivity.Meanwhile,the interfacial microdefects lead to a reduction in the insulation breakdown strength.At 90°C,the normal and tangential breakdown strengths decrease by a maximum of 20.6%and 54.5%,respectively.Notably,the space charges and microdefects lead to a rapid decline in the breakdown strength after hetero polarity pre-stressing.Especially for the tangential breakdown strength,the maximum decrease rate reaches 22.9%.Therefore,the interfacial microdefects caused by the drop in the welding temperature are the primary factors leading to a serious decrease in the electrical properties of EMJ insulation,making the EMJ insulation weaker than PP cable insulation.
文摘变电站Web发布系统实现了变电站远程监视功能，其中还包括保护定值、采样值和录波波形等信息的查看。文章介绍了CSC2000变电站监控系统中变电站Web发布系统的功能和实现方法，它采用B/S(Browser/Server)结构，其远程浏览功能可以灵活地嵌入电力管理信息系统(Management Information System, MIS)，具有使用灵活方便、安全性高的特点，可以作为变电站运行监视的有益补充。
文摘基于CSMC0.5um CMOS工艺,给出了一款3轴电容式微加速度计接口ASIC的详细设计方案。利用时分复用技术实现了使用同一电路模块同时检测3个轴向的加速度信号,利用相关双倍采样技术提高了电容电压转换的分辨率,利用Sigma_Delta调制技术对电路噪声进行有效整形。仿真得到系统的分辨率为0.91 a F/Hz1/2,3个轴向的噪声密度分别为43.60μg/Hz1/2、43.60μg/Hz1/2和45.70μg/Hz1/2,3个轴向输出数字脉冲信号占空比的非线性度分别为1.38%、0.91%和1.79%。
