An automatic IQ phase calibration method implemented in a 2.4GHz direct conversion receiver is proposed. It uses a delay locked loop （DLL） with a proposed quadrature phase detector to greatly reduce the phase error....An automatic IQ phase calibration method implemented in a 2.4GHz direct conversion receiver is proposed. It uses a delay locked loop （DLL） with a proposed quadrature phase detector to greatly reduce the phase error. The receiver is fabricated in a 0.18μm CMOS process. Measurements show that the IQ phase error can be calibrated within 1°,which satisfies the system requirement.展开更多
Today’s vehicles use electronic control units(ECU) to control engine/transmission, body and other amenities. All the vehicle performance depends on a lot of physical values and influence factors. This leads to a larg...Today’s vehicles use electronic control units(ECU) to control engine/transmission, body and other amenities. All the vehicle performance depends on a lot of physical values and influence factors. This leads to a large number of control and regulation parameters in the ECU software. The ultimate objective of calibration work is the optimum determination of these parameters. Qualitatively excellent results can only be achieved in a shorter time by using a highly efficient calibration system. This paper provided an overview of a new calibration tool based on KWP2000 and gave an example calibration with this tool.展开更多
Energy efficiency can be improved by reducing the amount of energy that we demand, and by changing our behaviors to reduce the amount of energy that we waste. This scheme manipulates the problem of incremental demand,...Energy efficiency can be improved by reducing the amount of energy that we demand, and by changing our behaviors to reduce the amount of energy that we waste. This scheme manipulates the problem of incremental demand, and low Power Factor （PF） for industrial plants, starting with walk through surveys, data analysis, providing advices to insure personnel involvement, and suggestions of practical circuits to attain the target. Elements of effective energy management program can be configured of management commitment, audit, analysis and implementation. Energy management opportunities can he operational and maintenance strategies, retrofit or modification strategies and new design strategies. The new technique of Power Factor Correction （PFC） that has been designed was the High Active Boost Power Factor Correction Pre-regulator Circuit, which was resulted in single / three phase PFC of about unity, in hand with a regulated output single phase voltage of about 220 VAC.展开更多
The purpose of this study is to investigate the effect of educational trends on A. T6rnudd＇s （1913） and V. Siukonen＇s （1929） methods of music education （teaching and singing） in Finland from 1863 to the late 1...The purpose of this study is to investigate the effect of educational trends on A. T6rnudd＇s （1913） and V. Siukonen＇s （1929） methods of music education （teaching and singing） in Finland from 1863 to the late 1930s. In the examination of methods the analysis focuses on the time when T6rnudd and Siukonen were influential. A model of analysis was created in the study, with the help of which common and divergent elements in the educational trends and methods of music education were sought. According to the study, TOmudd＇s pattern singing method represented the Old School starting points, but he was a supporter of the work school, for instance. Siukonen＇s method was based on the New School principle in which the child-centered education philosophy and the developmental-psychological growth and development were taken into account in developing the method. Siukonen raised singing by ear as a central feature, from which children made observations. Methodical transition period took place at the turn of the 1920s and 1930s. However, in teaching singing, the effects of the new trends were seen as early as from the late 1910s onwards.展开更多
文摘An automatic IQ phase calibration method implemented in a 2.4GHz direct conversion receiver is proposed. It uses a delay locked loop （DLL） with a proposed quadrature phase detector to greatly reduce the phase error. The receiver is fabricated in a 0.18μm CMOS process. Measurements show that the IQ phase error can be calibrated within 1°,which satisfies the system requirement.
文摘Today’s vehicles use electronic control units(ECU) to control engine/transmission, body and other amenities. All the vehicle performance depends on a lot of physical values and influence factors. This leads to a large number of control and regulation parameters in the ECU software. The ultimate objective of calibration work is the optimum determination of these parameters. Qualitatively excellent results can only be achieved in a shorter time by using a highly efficient calibration system. This paper provided an overview of a new calibration tool based on KWP2000 and gave an example calibration with this tool.
文摘Energy efficiency can be improved by reducing the amount of energy that we demand, and by changing our behaviors to reduce the amount of energy that we waste. This scheme manipulates the problem of incremental demand, and low Power Factor （PF） for industrial plants, starting with walk through surveys, data analysis, providing advices to insure personnel involvement, and suggestions of practical circuits to attain the target. Elements of effective energy management program can be configured of management commitment, audit, analysis and implementation. Energy management opportunities can he operational and maintenance strategies, retrofit or modification strategies and new design strategies. The new technique of Power Factor Correction （PFC） that has been designed was the High Active Boost Power Factor Correction Pre-regulator Circuit, which was resulted in single / three phase PFC of about unity, in hand with a regulated output single phase voltage of about 220 VAC.
文摘The purpose of this study is to investigate the effect of educational trends on A. T6rnudd＇s （1913） and V. Siukonen＇s （1929） methods of music education （teaching and singing） in Finland from 1863 to the late 1930s. In the examination of methods the analysis focuses on the time when T6rnudd and Siukonen were influential. A model of analysis was created in the study, with the help of which common and divergent elements in the educational trends and methods of music education were sought. According to the study, TOmudd＇s pattern singing method represented the Old School starting points, but he was a supporter of the work school, for instance. Siukonen＇s method was based on the New School principle in which the child-centered education philosophy and the developmental-psychological growth and development were taken into account in developing the method. Siukonen raised singing by ear as a central feature, from which children made observations. Methodical transition period took place at the turn of the 1920s and 1930s. However, in teaching singing, the effects of the new trends were seen as early as from the late 1910s onwards.
