A dedicated weak current measurement system was designed to measure the weak currents generated by the neutron ionization chamber.This system incorporates a second-order low-pass filter circuit and the Kalman filterin...A dedicated weak current measurement system was designed to measure the weak currents generated by the neutron ionization chamber.This system incorporates a second-order low-pass filter circuit and the Kalman filtering algorithm to effectively filter out noise and minimize interference in the measurement results.Testing conducted under normal temperature conditions has demonstrated the system's high precision performance.However,it was observed that temperature variations can affect the measurement performance.Data were collected across temperatures ranging from -20 to 70℃,and a temperature correction model was established through linear regression fitting to address this issue.The feasibility of the temperature correction model was confirmed at temperatures of -5 and 40℃,where relative errors remained below 0.1% after applying the temperature correction.The research indicates that the designed measurement system exhibits excellent temperature adaptability and high precision,making it particularly suitable for measuring weak currents.展开更多
Economic development and transportation construction are inseparable. With the rapid economic development, China pays more and more attention to the perfection of urban rail transit supporting facilities. Nowadays, ur...Economic development and transportation construction are inseparable. With the rapid economic development, China pays more and more attention to the perfection of urban rail transit supporting facilities. Nowadays, urban rail transit has become an important way for Chinese people to travel. Compared with other travel modes, rail transit has the characteristics of safety and convenience. Ensure the smooth operation of urban rail, the signal system is the most critical and important control core. Therefore, the signal system is of great significance to the running safety of rail trains, and a good signal system can avoid signal instability and further ensure the stability and safety of train operation. Therefore, this paper studies the relevant aspects of information security protection of rail transit weak current system, and focuses on the analysis of protection schemes and measures, so as to provide more support for the development and safety of rail transit in China.展开更多
With the continuous development of science and technology and the progress of society, intelligent technology has been further promoted and applied in construction engineering, and the development of construction indu...With the continuous development of science and technology and the progress of society, intelligent technology has been further promoted and applied in construction engineering, and the development of construction industry also presents an intelligent trend. The construction of intelligent building focuses on weak current link construction, so the construction company should strengthen the progress control and quality inspection of weak current project construction, so as to improve the quality level of weak current project. Based on the problems existing in the current construction of generic cabling and security system, this paper studies the key points in the construction process and specific construction technology, and puts forward some suggestions from the aspects of construction design and management, hoping to solve some problems existing in the current construction of generic cabling and security system, to provide valuable technical reference for relevant technical personnel and enterprises.展开更多
Building intelligent weak current system contains a large number of electronic equipment, which generally has low insulation strength and poor voltage tolerance, and is easy to be damaged in case of lightning weather....Building intelligent weak current system contains a large number of electronic equipment, which generally has low insulation strength and poor voltage tolerance, and is easy to be damaged in case of lightning weather. In order to improve the safety and stability of building intelligent weak current system, this paper analyzes the lightning protection technology of intelligent weak current system.展开更多
With the continuous development of industrial technology, the weak current plays an increasingly important role in all fields of life. In order to facilitate the user to carry, the study of contactless weak current me...With the continuous development of industrial technology, the weak current plays an increasingly important role in all fields of life. In order to facilitate the user to carry, the study of contactless weak current measurement technology is also emerging. This article’s design idea is based on two-dimensional reluctance sensor device built non-contact weak current detection system. The system uses the reluctance sensor HMC1002 to collect the current signal and the temperature sensor DS18B20 to compensate the temperature. The signals collected by the reluctance sensor and the temperature sensor are extremely weak. After being amplified by the amplifying circuit, the signal is conducive to subsequent detection and processing. Filter circuit can filter out interference signals to achieve the goal of improving accuracy. After the corresponding algorithm of the microcontroller will convert the signal voltage, easy to read and store, thus designing a non-contact current measurement capable of detecting weak currents and achieving higher accuracy.展开更多
The current–phase relations of a ring-trapped Bose–Einstein condensate interrupted by a rotating rectangular barrier are extensively investigated with an analytical solution. A current–phase diagram, single and mul...The current–phase relations of a ring-trapped Bose–Einstein condensate interrupted by a rotating rectangular barrier are extensively investigated with an analytical solution. A current–phase diagram, single and multi-valued relation, is presented with a rescaled barrier height and width. Our results show that the finite size makes the current–phase relation deviate a little bit from the cosine form for the soliton solution in the limit of a vanishing barrier, and the periodic boundary condition selects only the plane wave solution in the case of high barrier. The reason for multi-valued current–phase relation is given by investigating the behavior of soliton solution.展开更多
随着智慧城市建设的推进,智能楼宇管理系统日益重要。传统的楼宇弱电控制系统存在诸多局限性,难以满足现代智能楼宇的需求。设计了一种基于远距离无线电(Long Range Radio,LoRa)技术的智能楼宇弱电控制系统,采用模块化设计,包括数据采...随着智慧城市建设的推进,智能楼宇管理系统日益重要。传统的楼宇弱电控制系统存在诸多局限性,难以满足现代智能楼宇的需求。设计了一种基于远距离无线电(Long Range Radio,LoRa)技术的智能楼宇弱电控制系统,采用模块化设计,包括数据采集、数据传输、数据分析以及中央控制4个模块。通过实验验证,该系统在响应时间、控制精度、能源效率及故障检测等方面均优于传统RS-485系统,显著提升了系统性能和用户满意度,为智能楼宇管理提供了新的解决方案。展开更多
基金supported by the Youth Science Foundation of Sichuan Province(Nos.2022NSFSC1230 and 2022NSFSC1231)the Science and Technology Innovation Seedling Project of Sichuan Province(No.MZGC20230080)+1 种基金the General project of the National Natural Science Foundation of China(No.12075039)the Key project of the National Natural Science Foundation of China(No.U19A2086)。
文摘A dedicated weak current measurement system was designed to measure the weak currents generated by the neutron ionization chamber.This system incorporates a second-order low-pass filter circuit and the Kalman filtering algorithm to effectively filter out noise and minimize interference in the measurement results.Testing conducted under normal temperature conditions has demonstrated the system's high precision performance.However,it was observed that temperature variations can affect the measurement performance.Data were collected across temperatures ranging from -20 to 70℃,and a temperature correction model was established through linear regression fitting to address this issue.The feasibility of the temperature correction model was confirmed at temperatures of -5 and 40℃,where relative errors remained below 0.1% after applying the temperature correction.The research indicates that the designed measurement system exhibits excellent temperature adaptability and high precision,making it particularly suitable for measuring weak currents.
文摘Economic development and transportation construction are inseparable. With the rapid economic development, China pays more and more attention to the perfection of urban rail transit supporting facilities. Nowadays, urban rail transit has become an important way for Chinese people to travel. Compared with other travel modes, rail transit has the characteristics of safety and convenience. Ensure the smooth operation of urban rail, the signal system is the most critical and important control core. Therefore, the signal system is of great significance to the running safety of rail trains, and a good signal system can avoid signal instability and further ensure the stability and safety of train operation. Therefore, this paper studies the relevant aspects of information security protection of rail transit weak current system, and focuses on the analysis of protection schemes and measures, so as to provide more support for the development and safety of rail transit in China.
文摘With the continuous development of science and technology and the progress of society, intelligent technology has been further promoted and applied in construction engineering, and the development of construction industry also presents an intelligent trend. The construction of intelligent building focuses on weak current link construction, so the construction company should strengthen the progress control and quality inspection of weak current project construction, so as to improve the quality level of weak current project. Based on the problems existing in the current construction of generic cabling and security system, this paper studies the key points in the construction process and specific construction technology, and puts forward some suggestions from the aspects of construction design and management, hoping to solve some problems existing in the current construction of generic cabling and security system, to provide valuable technical reference for relevant technical personnel and enterprises.
文摘Building intelligent weak current system contains a large number of electronic equipment, which generally has low insulation strength and poor voltage tolerance, and is easy to be damaged in case of lightning weather. In order to improve the safety and stability of building intelligent weak current system, this paper analyzes the lightning protection technology of intelligent weak current system.
文摘With the continuous development of industrial technology, the weak current plays an increasingly important role in all fields of life. In order to facilitate the user to carry, the study of contactless weak current measurement technology is also emerging. This article’s design idea is based on two-dimensional reluctance sensor device built non-contact weak current detection system. The system uses the reluctance sensor HMC1002 to collect the current signal and the temperature sensor DS18B20 to compensate the temperature. The signals collected by the reluctance sensor and the temperature sensor are extremely weak. After being amplified by the amplifying circuit, the signal is conducive to subsequent detection and processing. Filter circuit can filter out interference signals to achieve the goal of improving accuracy. After the corresponding algorithm of the microcontroller will convert the signal voltage, easy to read and store, thus designing a non-contact current measurement capable of detecting weak currents and achieving higher accuracy.
基金Project supported by the National Natural Science Foundation of China(Grant No.11874247)the National Key Research and Development Program of China(Grant Nos.2017YFA0304500 and 2017YFA0304203)+1 种基金PCSIRT,China(Grant No.IRT-17R70)the Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices,China(Grant No.KF201703)
文摘The current–phase relations of a ring-trapped Bose–Einstein condensate interrupted by a rotating rectangular barrier are extensively investigated with an analytical solution. A current–phase diagram, single and multi-valued relation, is presented with a rescaled barrier height and width. Our results show that the finite size makes the current–phase relation deviate a little bit from the cosine form for the soliton solution in the limit of a vanishing barrier, and the periodic boundary condition selects only the plane wave solution in the case of high barrier. The reason for multi-valued current–phase relation is given by investigating the behavior of soliton solution.
文摘随着智慧城市建设的推进,智能楼宇管理系统日益重要。传统的楼宇弱电控制系统存在诸多局限性,难以满足现代智能楼宇的需求。设计了一种基于远距离无线电(Long Range Radio,LoRa)技术的智能楼宇弱电控制系统,采用模块化设计,包括数据采集、数据传输、数据分析以及中央控制4个模块。通过实验验证,该系统在响应时间、控制精度、能源效率及故障检测等方面均优于传统RS-485系统,显著提升了系统性能和用户满意度,为智能楼宇管理提供了新的解决方案。
