In order to solve the disadvantages caused by mechanical slide rheostat that has big errors and low precision,a novel voltage regulation method for high voltage DC power supply was introduced.The key of this method we...In order to solve the disadvantages caused by mechanical slide rheostat that has big errors and low precision,a novel voltage regulation method for high voltage DC power supply was introduced.The key of this method were digital potentiometer MAXIM 5455 and linear photoelectric coupling LOC110,and application programs were compiled using Visual Basic which was graphical compiling language,furthermore the communication between exterior and computer was carried out by ICP7044D module,in consequence the output value of high voltage DC power supply could be regulated with computer.The measured results showed that this method could accurately,conveniently and rapidly regulate the output value of high voltage DC power supply.展开更多
大规模双馈风电场作为实现我国“双碳”目标的陆上风电主力,其高比例电力电子设备的接入对电力系统电磁暂态高精度仿真技术提出日益严苛的要求,面向上百台发电单元的双馈场站全拓扑精细化微秒级仿真研究仍相对空白。基于现场可编程门阵...大规模双馈风电场作为实现我国“双碳”目标的陆上风电主力,其高比例电力电子设备的接入对电力系统电磁暂态高精度仿真技术提出日益严苛的要求,面向上百台发电单元的双馈场站全拓扑精细化微秒级仿真研究仍相对空白。基于现场可编程门阵列(field programmable gate array,FPGA)微秒级小步长并行仿真能力,提出一种面向双馈风电场站的发电单元FPGA并行仿真方法。首先,进行双馈感应电机微秒级高并行度离散化建模与换流器受控源建模;接着,对节点导纳矩阵分块降维以实现发电单元内部分网并行,并从整体电路解算层面提出单元级并行仿真框架;最后,考虑实时数字仿真器(real time digital simulator,RTDS)与FPGA仿真平台特点,分配发电单元的微秒级小步长仿真任务并搭建联合仿真硬件框架;通过对比RTDS标准模型与RTDS+FPGA联合仿真模型,验证所提并行仿真方法的准确性。展开更多
Quasi-Newton methods are the most widely used methods to find local maxima and minima of functions in various engineering practices. However, they involve a large amount of matrix and vector operations, which are comp...Quasi-Newton methods are the most widely used methods to find local maxima and minima of functions in various engineering practices. However, they involve a large amount of matrix and vector operations, which are computationally intensive and require a long processing time. Recently, with the increasing density and arithmetic cores, field programmable gate array(FPGA) has become an attractive alternative to the acceleration of scientific computation. This paper aims to accelerate Davidon-Fletcher-Powell quasi-Newton(DFP-QN) method by proposing a customized and pipelined hardware implementation on FPGAs. Experimental results demonstrate that compared with a software implementation, a speed-up of up to 17 times can be achieved by the proposed hardware implementation.展开更多
In 2014, the European Commission carries out a new programme----"Erasmus+ Programme". It increases people's skills and employability through provides grants to support students, trainees, staff and volun...In 2014, the European Commission carries out a new programme----"Erasmus+ Programme". It increases people's skills and employability through provides grants to support students, trainees, staff and volunteers to study or work abroad and organizations to organize activities. In order to let more Chinese people know about"Erasmus+ Programme"and participate in it, the author of the paper just selects its introductory part Erasmus+ Programme Guide to translate. While translating, the author of the paper finds that certain translation theory and correspondent translation methods must be adopted to guide the translation in order to produce a correct and expressive version. The paper is hence intended to study the translation theory and translation methods adopted in the translation of Erasmus+ Programme Guide.展开更多
Background Pelvic floor dysfunction(PFD)affects women's health and quality of life seriously.Postpartum is a crucial stage and ideal opportunity for the prevention and treatment of PFD diseases.Therefore,it is ess...Background Pelvic floor dysfunction(PFD)affects women's health and quality of life seriously.Postpartum is a crucial stage and ideal opportunity for the prevention and treatment of PFD diseases.Therefore,it is essential to promote postpartum physical recoveryandeffectively improve the prevention and treatment effect of PFD through a simple,non-invasive and high-compliance pelvic floor rehabilitation programme during postpartum pelvic floorrehabilitation.Methods A literature review was conducted to develop the initial list of competencies which consisted of 23 items from six models.Two rounds of Delphi Surveys were conducted,inviting experts via email to rate the importance of each item and provide qualitative comments on their ratings.Consensus was predefined as a mean score of 4.0 or above and at least 75%agreement among the participants.Results The postnatal pelvic floor rehabilitation exercise programme developed in this study was guided by the holistic pelvic floor theory'proposed by Petros and Ulmsten.The effective recovery rate of the two rounds of expert consultation questionnaires was 100%.In the first round,some items were changed according to experts'opinions.In the second round,the expert authority coefficient was 0.819.The Kendall coefficient of expert opinion was 0.154(p<0.01).The final plan included 6 modules with 23 items.The postpartum pelvic floor rehabilitation exercise programme was formed,consisting of six exercises(APBKQS-exercise)such as abdominal breathing,pelvic exercise,bridge exercise,kneeling balance,quadrupedal stretching and supine hand-andkneeconfrontation.Conclusion The postnatal pelvic floor rehabilitation exercise programme constructed in this study integrates multiple exercises(APBKQS-exercise).Theexercise programme guided by the"holistic pelvic floor theory"incorporates the use of Women's Active Functional Fitness Equipment(WAFF)exercise air cushions to better achieve the purpose of alleviating joint pain,loosening contracture muscles,repairing pelvic floor muscles,strengthening abdominal core strength,and recovering body shape as soon as possible.展开更多
将神经网络与比例-积分-微分(Proportion Integral Differential,PID)相结合,设计电力可编程逻辑控制器(Programmable Logic Controller,PLC)高精度温控方法。选用GX20MH01型号的温度传感器采集温度数据;选择多层前馈神经网络作为神经...将神经网络与比例-积分-微分(Proportion Integral Differential,PID)相结合,设计电力可编程逻辑控制器(Programmable Logic Controller,PLC)高精度温控方法。选用GX20MH01型号的温度传感器采集温度数据;选择多层前馈神经网络作为神经网络结构,计算网络传播数据的误差;通过神经元输出的激活数值,引进PID控制算法,整定电力系统控制器温度参数;基于专家经验知识,将输入变量划分为若干个模糊集合,以此为依据设计模糊控制规则,高精度控制电力PLC温度。对比实验结果表明:应用设计的方法进行温度控制后,电力PLC温度值稳定在目标值,波动范围极小,控制效果良好。展开更多
基金Project Supported by National Natural Science Foundation of China（50637020）.
文摘In order to solve the disadvantages caused by mechanical slide rheostat that has big errors and low precision,a novel voltage regulation method for high voltage DC power supply was introduced.The key of this method were digital potentiometer MAXIM 5455 and linear photoelectric coupling LOC110,and application programs were compiled using Visual Basic which was graphical compiling language,furthermore the communication between exterior and computer was carried out by ICP7044D module,in consequence the output value of high voltage DC power supply could be regulated with computer.The measured results showed that this method could accurately,conveniently and rapidly regulate the output value of high voltage DC power supply.
文摘大规模双馈风电场作为实现我国“双碳”目标的陆上风电主力,其高比例电力电子设备的接入对电力系统电磁暂态高精度仿真技术提出日益严苛的要求,面向上百台发电单元的双馈场站全拓扑精细化微秒级仿真研究仍相对空白。基于现场可编程门阵列(field programmable gate array,FPGA)微秒级小步长并行仿真能力,提出一种面向双馈风电场站的发电单元FPGA并行仿真方法。首先,进行双馈感应电机微秒级高并行度离散化建模与换流器受控源建模;接着,对节点导纳矩阵分块降维以实现发电单元内部分网并行,并从整体电路解算层面提出单元级并行仿真框架;最后,考虑实时数字仿真器(real time digital simulator,RTDS)与FPGA仿真平台特点,分配发电单元的微秒级小步长仿真任务并搭建联合仿真硬件框架;通过对比RTDS标准模型与RTDS+FPGA联合仿真模型,验证所提并行仿真方法的准确性。
基金Supported by the National Natural Science Foundation of China(No.61574099)
文摘Quasi-Newton methods are the most widely used methods to find local maxima and minima of functions in various engineering practices. However, they involve a large amount of matrix and vector operations, which are computationally intensive and require a long processing time. Recently, with the increasing density and arithmetic cores, field programmable gate array(FPGA) has become an attractive alternative to the acceleration of scientific computation. This paper aims to accelerate Davidon-Fletcher-Powell quasi-Newton(DFP-QN) method by proposing a customized and pipelined hardware implementation on FPGAs. Experimental results demonstrate that compared with a software implementation, a speed-up of up to 17 times can be achieved by the proposed hardware implementation.
文摘In 2014, the European Commission carries out a new programme----"Erasmus+ Programme". It increases people's skills and employability through provides grants to support students, trainees, staff and volunteers to study or work abroad and organizations to organize activities. In order to let more Chinese people know about"Erasmus+ Programme"and participate in it, the author of the paper just selects its introductory part Erasmus+ Programme Guide to translate. While translating, the author of the paper finds that certain translation theory and correspondent translation methods must be adopted to guide the translation in order to produce a correct and expressive version. The paper is hence intended to study the translation theory and translation methods adopted in the translation of Erasmus+ Programme Guide.
基金supported by the Chinese Association of Plastics and Aesthetics under Award Number FRPR2020-nxxt-09。
文摘Background Pelvic floor dysfunction(PFD)affects women's health and quality of life seriously.Postpartum is a crucial stage and ideal opportunity for the prevention and treatment of PFD diseases.Therefore,it is essential to promote postpartum physical recoveryandeffectively improve the prevention and treatment effect of PFD through a simple,non-invasive and high-compliance pelvic floor rehabilitation programme during postpartum pelvic floorrehabilitation.Methods A literature review was conducted to develop the initial list of competencies which consisted of 23 items from six models.Two rounds of Delphi Surveys were conducted,inviting experts via email to rate the importance of each item and provide qualitative comments on their ratings.Consensus was predefined as a mean score of 4.0 or above and at least 75%agreement among the participants.Results The postnatal pelvic floor rehabilitation exercise programme developed in this study was guided by the holistic pelvic floor theory'proposed by Petros and Ulmsten.The effective recovery rate of the two rounds of expert consultation questionnaires was 100%.In the first round,some items were changed according to experts'opinions.In the second round,the expert authority coefficient was 0.819.The Kendall coefficient of expert opinion was 0.154(p<0.01).The final plan included 6 modules with 23 items.The postpartum pelvic floor rehabilitation exercise programme was formed,consisting of six exercises(APBKQS-exercise)such as abdominal breathing,pelvic exercise,bridge exercise,kneeling balance,quadrupedal stretching and supine hand-andkneeconfrontation.Conclusion The postnatal pelvic floor rehabilitation exercise programme constructed in this study integrates multiple exercises(APBKQS-exercise).Theexercise programme guided by the"holistic pelvic floor theory"incorporates the use of Women's Active Functional Fitness Equipment(WAFF)exercise air cushions to better achieve the purpose of alleviating joint pain,loosening contracture muscles,repairing pelvic floor muscles,strengthening abdominal core strength,and recovering body shape as soon as possible.
文摘将神经网络与比例-积分-微分(Proportion Integral Differential,PID)相结合,设计电力可编程逻辑控制器(Programmable Logic Controller,PLC)高精度温控方法。选用GX20MH01型号的温度传感器采集温度数据;选择多层前馈神经网络作为神经网络结构,计算网络传播数据的误差;通过神经元输出的激活数值,引进PID控制算法,整定电力系统控制器温度参数;基于专家经验知识,将输入变量划分为若干个模糊集合,以此为依据设计模糊控制规则,高精度控制电力PLC温度。对比实验结果表明:应用设计的方法进行温度控制后,电力PLC温度值稳定在目标值,波动范围极小,控制效果良好。
