We investigate and compare the performance of four optical transport schemes for distributing Local Multipoint Distribution Service (LMDS) signals using an optical fiber backbone.
This system takes single-chip microcomputer ATMEGA32 as the control core, controls ATT7022B and other peripherals, and realizes the basic control of various electrical parameter tests and other functions. The hardware...This system takes single-chip microcomputer ATMEGA32 as the control core, controls ATT7022B and other peripherals, and realizes the basic control of various electrical parameter tests and other functions. The hardware part of the system includes the smallest system board, data acquisition circuit and human-computer interaction interface. The data acquisition part consists of transformer, signal pre-processing and seven-channel two-dielectric sigma-delta ADC conversion integrated in ATT7022B, which can measure not only single-phase electrical parameters, but also three-phase electrical parameters and temperature. The precision of ATT7022B is relatively high, the nonlinear measurement is less than 0.1%, and the precision of voltage and current RMS is better than 0.5%. The human-computer interface includes 4*4 keyboard input, infrared keyboard, 128*64 dot matrix LCD, etc. In the software part, the MCU C language is used to realize the control functions of the design, including basic electrical parameters and time display, and part of the functions of printing, presetting, alarm, etc. Due to the rich system resources, the application can also be expanded conveniently.展开更多
With the rapid development of economy, strengthen the continuous construction of national infrastructure, etc., many industry demand for steel, steel enterprise capacity expands, at the same time, the steel enterprise...With the rapid development of economy, strengthen the continuous construction of national infrastructure, etc., many industry demand for steel, steel enterprise capacity expands, at the same time, the steel enterprises to positive response to the call of national energy conservation and emission reduction, using plant waste heat green development is the only way to realize the transformation and upgrading of the steel industry. This paper will be mainly for the domestic steel enterprise 6kV system short circuit current exceeds the limit and take the restrictive measures for detailed analysis and discussion for the industry reference.展开更多
During an epidemic,such as the COVID-19 pandemic,policy-makers are faced with the decision of implementing effective,yet socioeconomically costly intervention strategies,such as school and workplace closure,physical d...During an epidemic,such as the COVID-19 pandemic,policy-makers are faced with the decision of implementing effective,yet socioeconomically costly intervention strategies,such as school and workplace closure,physical distancing,etc.In this study,we propose a rigorous definition of epidemiological strategies.In addition,we develop a scheme for comparing certain epidemiological strategies,with the goal of providing policy-makers with a tool for their systematic comparison.Then,we put the suggested scheme to the test by employing an age-based epidemiological compartment model introduced in Bitsouni et al.(2024),coupled with data from the literature,in order to compare the effectiveness of age-based and horizontal interventions.In general,our findings suggest that these two are comparable,mainly at a low or medium level of intensity.展开更多
Over the last few decades, several all-optical circuits have been proposed to meet the need of high-speed data processing. In some information processing architectures, the role of various analog and digital data comp...Over the last few decades, several all-optical circuits have been proposed to meet the need of high-speed data processing. In some information processing architectures, the role of various analog and digital data comparisons is very important. In this letter, we proposed a multi-bit data comparison scheme. The scheme is based on the switching property of optical nonlinear material. Ultrafast operational speed larger than gigahertz can be expected from this all-optical scheme.展开更多
文摘We investigate and compare the performance of four optical transport schemes for distributing Local Multipoint Distribution Service (LMDS) signals using an optical fiber backbone.
文摘This system takes single-chip microcomputer ATMEGA32 as the control core, controls ATT7022B and other peripherals, and realizes the basic control of various electrical parameter tests and other functions. The hardware part of the system includes the smallest system board, data acquisition circuit and human-computer interaction interface. The data acquisition part consists of transformer, signal pre-processing and seven-channel two-dielectric sigma-delta ADC conversion integrated in ATT7022B, which can measure not only single-phase electrical parameters, but also three-phase electrical parameters and temperature. The precision of ATT7022B is relatively high, the nonlinear measurement is less than 0.1%, and the precision of voltage and current RMS is better than 0.5%. The human-computer interface includes 4*4 keyboard input, infrared keyboard, 128*64 dot matrix LCD, etc. In the software part, the MCU C language is used to realize the control functions of the design, including basic electrical parameters and time display, and part of the functions of printing, presetting, alarm, etc. Due to the rich system resources, the application can also be expanded conveniently.
文摘With the rapid development of economy, strengthen the continuous construction of national infrastructure, etc., many industry demand for steel, steel enterprise capacity expands, at the same time, the steel enterprises to positive response to the call of national energy conservation and emission reduction, using plant waste heat green development is the only way to realize the transformation and upgrading of the steel industry. This paper will be mainly for the domestic steel enterprise 6kV system short circuit current exceeds the limit and take the restrictive measures for detailed analysis and discussion for the industry reference.
基金financed by the Research Council of the University of Patras.
文摘During an epidemic,such as the COVID-19 pandemic,policy-makers are faced with the decision of implementing effective,yet socioeconomically costly intervention strategies,such as school and workplace closure,physical distancing,etc.In this study,we propose a rigorous definition of epidemiological strategies.In addition,we develop a scheme for comparing certain epidemiological strategies,with the goal of providing policy-makers with a tool for their systematic comparison.Then,we put the suggested scheme to the test by employing an age-based epidemiological compartment model introduced in Bitsouni et al.(2024),coupled with data from the literature,in order to compare the effectiveness of age-based and horizontal interventions.In general,our findings suggest that these two are comparable,mainly at a low or medium level of intensity.
文摘Over the last few decades, several all-optical circuits have been proposed to meet the need of high-speed data processing. In some information processing architectures, the role of various analog and digital data comparisons is very important. In this letter, we proposed a multi-bit data comparison scheme. The scheme is based on the switching property of optical nonlinear material. Ultrafast operational speed larger than gigahertz can be expected from this all-optical scheme.
