Dynamic oxygen storage and release capability (OSC) measurement apparatus was designed to evaluate the OSC performance of ceria-based oxygen storage material. The optimum measurement condition was at a frequency of ...Dynamic oxygen storage and release capability (OSC) measurement apparatus was designed to evaluate the OSC performance of ceria-based oxygen storage material. The optimum measurement condition was at a frequency of 0.1 Hz with the inlet gas-flow sequence CO (5S)→O2(5S)→CO→O2 and a flow rate of 300 ml·min^-1. Under this condition, similar regular square wave in the inlet and outlet of the reactor was obtained to guarantee the reliability of the dynamic OSC results. The dynamic OSC performance of the CeO2 and Ce0.67Zr0.33O2 mixed oxide prepared using the citric sol-gel method was studied at the optimum measurement condition with focus on both quantitative and qualitative analyses, The results reveal distinctly that Ce0.67Zr0.33O2 had better dynamic OSC performance because of its higher oxygen migration rate than CeO2. Under dynamic conditions, two CO2 production peaks occurred corresponding to the CO pulse and the O2 pulse, respectively, during the entire cycle. The intensity and ratio between the two CO2 productions were highly influenced by temperature and frequency indicating complex surface phenomena during the oxygen storage/release process, As a result, this set-up can be applied to the evaluation of ceria-based material on the OSC performance.展开更多
Dynamic capacity increase in high voltage electric power transmission line is currently the most economical method for solving electric power transmission bottleneck nowadays. DS18B20 temperature sensor is applied to ...Dynamic capacity increase in high voltage electric power transmission line is currently the most economical method for solving electric power transmission bottleneck nowadays. DS18B20 temperature sensor is applied to the dynamic capacity increase of high voltage transmission lines to measure the conductor temperature and ambient temperature. The paper is focused on the experiment of DS18B20 both in the laboratory and outside. From the result of the lab temperature measurement data analysis, using 4 DS18B20’s is the most suitable plan, considering both accuracy and economical efficiency. In the experiment outside, we get four groups of conductor (uncharged) temperature and four groups of ambient temperature. The data proved that DS18B20 has good stability, and small measurement error. It is suitable for measuring the temperature of conductor and ambient in dynamic capacity increase, and helpful to improve the accuracy of the calculation of capacity increasing.展开更多
FCR(恒进制)是1500多年来在数论的离散进位计数换算规则制(DCR)中占主流和主导而统治使用地位的计数制,VCR(变进制)则是1995年在FCR基础上拓展起来的新型的计数制,VCR与FCR相比具有更好的可拓性与压缩性、模糊性与保密性、智能性与设密...FCR(恒进制)是1500多年来在数论的离散进位计数换算规则制(DCR)中占主流和主导而统治使用地位的计数制,VCR(变进制)则是1995年在FCR基础上拓展起来的新型的计数制,VCR与FCR相比具有更好的可拓性与压缩性、模糊性与保密性、智能性与设密性、灵活性与变溢性(VCO,Variable Capacities of Overflowing)。FPGA(现场可编程门阵列)是20世纪一种新型可编程逻辑器件,它因具有大容量、小时延、易改进、便拓展等灵活性特点而广泛应用于工业现场智能的动态测试和控制技术等领域。本文基于VCR智能特性,提出了一种在RAM中实现的动态测试计量技术,其计量结果可获得更大数据挖掘与方便实用的拓展空间:如可长期得到无溢出、无扰动,有断点、有过程和可存储、可加密的历史信息记录等。展开更多
基金Project supported by the National"973"Project (2004CB719503) and the Programfor New Century Excellent Talents in University
文摘Dynamic oxygen storage and release capability (OSC) measurement apparatus was designed to evaluate the OSC performance of ceria-based oxygen storage material. The optimum measurement condition was at a frequency of 0.1 Hz with the inlet gas-flow sequence CO (5S)→O2(5S)→CO→O2 and a flow rate of 300 ml·min^-1. Under this condition, similar regular square wave in the inlet and outlet of the reactor was obtained to guarantee the reliability of the dynamic OSC results. The dynamic OSC performance of the CeO2 and Ce0.67Zr0.33O2 mixed oxide prepared using the citric sol-gel method was studied at the optimum measurement condition with focus on both quantitative and qualitative analyses, The results reveal distinctly that Ce0.67Zr0.33O2 had better dynamic OSC performance because of its higher oxygen migration rate than CeO2. Under dynamic conditions, two CO2 production peaks occurred corresponding to the CO pulse and the O2 pulse, respectively, during the entire cycle. The intensity and ratio between the two CO2 productions were highly influenced by temperature and frequency indicating complex surface phenomena during the oxygen storage/release process, As a result, this set-up can be applied to the evaluation of ceria-based material on the OSC performance.
文摘Dynamic capacity increase in high voltage electric power transmission line is currently the most economical method for solving electric power transmission bottleneck nowadays. DS18B20 temperature sensor is applied to the dynamic capacity increase of high voltage transmission lines to measure the conductor temperature and ambient temperature. The paper is focused on the experiment of DS18B20 both in the laboratory and outside. From the result of the lab temperature measurement data analysis, using 4 DS18B20’s is the most suitable plan, considering both accuracy and economical efficiency. In the experiment outside, we get four groups of conductor (uncharged) temperature and four groups of ambient temperature. The data proved that DS18B20 has good stability, and small measurement error. It is suitable for measuring the temperature of conductor and ambient in dynamic capacity increase, and helpful to improve the accuracy of the calculation of capacity increasing.
文摘FCR(恒进制)是1500多年来在数论的离散进位计数换算规则制(DCR)中占主流和主导而统治使用地位的计数制,VCR(变进制)则是1995年在FCR基础上拓展起来的新型的计数制,VCR与FCR相比具有更好的可拓性与压缩性、模糊性与保密性、智能性与设密性、灵活性与变溢性(VCO,Variable Capacities of Overflowing)。FPGA(现场可编程门阵列)是20世纪一种新型可编程逻辑器件,它因具有大容量、小时延、易改进、便拓展等灵活性特点而广泛应用于工业现场智能的动态测试和控制技术等领域。本文基于VCR智能特性,提出了一种在RAM中实现的动态测试计量技术,其计量结果可获得更大数据挖掘与方便实用的拓展空间:如可长期得到无溢出、无扰动,有断点、有过程和可存储、可加密的历史信息记录等。