The key technology of semi-continuous conveyor system decides the successful using of this system. The key technology includes optimal initial building depth of this system,the crusher moving step and the layout of co...The key technology of semi-continuous conveyor system decides the successful using of this system. The key technology includes optimal initial building depth of this system,the crusher moving step and the layout of conveyor system are studied, and their calculating models are built up.展开更多
A low-power environmental monitoring system based on WSN technology is proposed to effectively monitor the environmental status and ensure the healthy growth of greenhouse crops in the greenhouse. The system performs ...A low-power environmental monitoring system based on WSN technology is proposed to effectively monitor the environmental status and ensure the healthy growth of greenhouse crops in the greenhouse. The system performs dynamic mon- itoring on the environmental data of temperature, humidity, illumination, soil tempera- ture and humidity of the greenhouse, and it reduces the energy consumption by us- ing solar energy and lithium battery as the power supply mode and dynamic power management algorithm combined with improved routing protocol. Stable and reliable, the system could effectively monitor the key environmental factors in the green- house, making it of certain promotion value.展开更多
In order to develop green good, reduce the use of chemical fertilizer and pesticide, realize ＂double reduction＂ and synergism, improve safety and quality of products, protect the ecological environment and promote t...In order to develop green good, reduce the use of chemical fertilizer and pesticide, realize ＂double reduction＂ and synergism, improve safety and quality of products, protect the ecological environment and promote the healthy and steady development of strawberry industry, the goals and key technology of fertilizer-pesticide ＂double reduction＂ and synergism for greenhouse strawberry are summed up in this paper targeting at the current situation of strawberry production and combined with the new technology achievements at home and abroad. The key technology includes six items： healthy seedling cultivating technique, soil improvement and continuous cropping obstacle treatment technique, agricultural ecological prevention tech- nique, physicochemical trap of pest control technique, biological control technique and low residual risk chemical control technique.展开更多
On-site inspection of municipal road subgrade and pavement is of great significance for ensuring the quality,safety,and durability of urban road infrastructure.This paper analyzes its key technologies,introduces non-d...On-site inspection of municipal road subgrade and pavement is of great significance for ensuring the quality,safety,and durability of urban road infrastructure.This paper analyzes its key technologies,introduces non-destructive testing methods such as ground-penetrating radar and ultrasonic testing,elaborates on the multifaceted roles of inspection in engineering construction as well as relevant standards,explores site challenges,key technologies,and corresponding measures,and points out future research directions in intelligent sensing and predictive maintenance.展开更多
Quantum key distribution(QKD) generates information-theoretical secret keys between two parties based on the physical laws of quantum mechanics. Following the advancement in quantum communication networks, it becomes ...Quantum key distribution(QKD) generates information-theoretical secret keys between two parties based on the physical laws of quantum mechanics. Following the advancement in quantum communication networks, it becomes feasible and economical to combine QKD with classical optical communication through the same fiber using dense wavelength division multiplexing(DWDM) technology. This study proposes a detailed scheme of TF-QKD protocol with DWDM technology and analyzes its performance, considering the influence of quantum channel number and adjacent quantum crosstalk on the secret key rates. The simulation results show that the scheme further increases the secret key rate of TF-QKD and its variants. Therefore, this scheme provides a method for improving the secret key rate for practical quantum networks.展开更多
At present, with the rapid development of science and technology, based on the requirements of weapon test and identification tasks, the experimental data acquisition and processing space station, which is suitable fo...At present, with the rapid development of science and technology, based on the requirements of weapon test and identification tasks, the experimental data acquisition and processing space station, which is suitable for a variety of extreme natural environments such as alpine, plateau, mountain, jungle, desert, island and reef, has been studied theoretically and in practice. The space station is a dome-shaped structure with scale-shaped modules and basalt reinforced fiber composite materials, providing thermal insulation, ventilation and continuous power supply. It can provide support and guarantee for the real-time monitoring, recovery and information transmission of test data, and meet the basic work and life needs of test personnel.展开更多
On October 14, two satellites SJ-9A/B were sent into their preset orbits by a LM-2C/SMA launch vehicle, which is the first flight of a series of China's civilian technology experimental satellites. SJ-9A and B are...On October 14, two satellites SJ-9A/B were sent into their preset orbits by a LM-2C/SMA launch vehicle, which is the first flight of a series of China's civilian technology experimental satellites. SJ-9A and B are the first two satellites in the series of civilian technology experimental satellites designed for tests such as long lifetime and high reliability, high precision and high performance of satellite, domestically developed core components, satellite formation展开更多
There are abundant tight sandstone gas resources in the Sichuan Basin,which are the important objects of reserve and production increase and large-scale development.Due to their discontinuous sandbody distribution,nar...There are abundant tight sandstone gas resources in the Sichuan Basin,which are the important objects of reserve and production increase and large-scale development.Due to their discontinuous sandbody distribution,narrow channels,and strong horizontal and vertical heteroge-neity,however,conventional fracturing technologies cannot achieve the ideal stimulation effect here.In order to address this difficulty,this paper dissects the geology engineering characteristics of tight sandstone gas reservoirs in the western Sichuan Basin.Starting from the seepage mechanics theory,the concept of“multi-scale high-density”tight gas fracturing technology is put forward by fully referring to the experience of previous multi-round reservoir stimulation in the western Sichuan Basin and the idea of unconventional volume fracturing technology.In addition,its conceptual connotation,key technologies and implementation effects are illustrated.The following research results are obtained.First,the seepage characteristics make it necessary for the efficient production of tight gas reserves to increase fracture density and stimulated reservoir volume(SRV).Second,the“multi-scale high-density”fracturing technology emphasizes the rationality of high-density hydraulic fracture creation and the matching of multi-scale fractureflow capacity,and aims at establishing a multi-level fracture system with effective and steady gasflow in tight reservoirs through fracturing.Third,the“wide,dense,support,stable,and precise”fracturing technology is applied to improve single well production and estimated ultimate recovery(EUR).Fourth,the engineering practice of“multi-scale high-density”fracturing technology in the tight reservoirs of Jurassic Shaximiao Formation and Triassic Xujiahe Formation in the ZJ Gas Field realizes the average single well production rate of 15.6104 m3/d,which is 1.96 times higher than that before the stimulation.Obviously,it provides powerful support for the operation of the ZJ Gas Field into a giant gasfield with the reserves of 100 billion cubic meters.In conclusion,the formation of the concept and key technologies of“multi-scale high-density”fracturing technology effectively supports the efficient development of tight gas in the western Sichuan Basin and points out the following research direction of tight gas reservoir stimulation.The research results provide reference and guidance for the large-scale benefit development of tight gas in China.展开更多
In China,operational in-situ marine monitoring is the primary means of directly obtaining hydrological,meteorological,and oceanographic environmental parameters across sea areas,and it is essential for applications su...In China,operational in-situ marine monitoring is the primary means of directly obtaining hydrological,meteorological,and oceanographic environmental parameters across sea areas,and it is essential for applications such as forecast of marine environment,prevention and mitigation of disaster,exploitation of marine resources,marine environmental protection,and management of transportation safety.In this paper,we summarise the composition,development courses,and present operational status of three systems of operational in-situ marine monitoring,namely coastal marine automated network station,ocean data buoy and voluntary observing ship measuring and reporting system.Additionally,we discuss the technical development in these in-situ systems and achievements in the key generic technologies along with future development trends.展开更多
This paper presented a new-type CNC curve grinding machine, in order to conquer the disadvantages of conventional NC curve grinding machine and improve surface quality, dimensional accuracy and machining efficiency. T...This paper presented a new-type CNC curve grinding machine, in order to conquer the disadvantages of conventional NC curve grinding machine and improve surface quality, dimensional accuracy and machining efficiency. The new-type grinder adopts some high and new technologies: ① the normal tracing device could make grinding wheel coincide with the normal direction of the machining points in work piece, and improve surface quality and dimensional accuracy; ② the digital image on-line recognition system could monitor machining process and compensate wheel wear in real time; ③ linear motor drive mechanism could realize the exact adjustment of the grinding head digitally and increase the machining efficiency. The math models of normal tracing and circular tolerance zone were presented. The experimental results show that the new-type CNC curve grinding machine equipped with the three devices mentioned above is easy to realize the precision grinding of any complex curve, and improve surface quality, dimensional accuracy and machining efficiency.展开更多
To understand the resource features and geology in the deep Jinchuan nickel deposit, difficult geological conditions were systematically analyzed, including high stress, fragmentized ore rock, prevalent deformation, d...To understand the resource features and geology in the deep Jinchuan nickel deposit, difficult geological conditions were systematically analyzed, including high stress, fragmentized ore rock, prevalent deformation, difficult tunnel support, complicated rock mechanics, and low mining recovery. An integrated technology package was built for safe, efficient, and continuous mining in a deep, massive, and complex nickel and cobalt mine. This was done by the invention of a large-area continuous mining method with honeycomb drives; the establishment of ground control theory and a technology package for high-stress and fragmented ore rock： and the development of a new type of backfilling cement material, along with a deep backfilling technology that comprises the pipeline transport of high-density slurry with coarse aggregates. In this way, good solutions to existing problems were found to permit the efficient exploitation and comprehensive utilization of the resources in the deep Jinchuan nickel mine. In addition, a technological demonstration in an underground mine was performed using the cemented undercut-and-fill mining method for stressful, frag- mented, and rheological rock.展开更多
The pipeline all-position automatic welding machine system is a special welding system for automatically welding circumferential joint of pipeline on site, which has been widely used to the long-distance pipeline cons...The pipeline all-position automatic welding machine system is a special welding system for automatically welding circumferential joint of pipeline on site, which has been widely used to the long-distance pipeline construction projects due to the advantages of automatic control for welding parameters at all-position, moving speed of bugs and operating. In this paper, the key control technologies of PAWM all-position automatic welding machine （ developed by Pipeline Research Institute of CNPC） such us the automatic control system, control software, personal digital assistant （PDA） software and complex programmable logic device （ CPLD ） program as well us the control method of welding parameter have been described detailedly. With the higher welding quality, higher welding effwiency and lower labor intensity, PA WM all-position automatic welding machine has been successfully applied in many famous pipeline construction projects.展开更多
A novel suspension-floating-circulating fluidized combustion technology is proposed for burning coal slurry fuel in traditional circulating ftuidized bed boilers （CFBB）. This technology can solve some existing probl...A novel suspension-floating-circulating fluidized combustion technology is proposed for burning coal slurry fuel in traditional circulating ftuidized bed boilers （CFBB）. This technology can solve some existing problems in large- capacity CFBB burning coal slurry. The principles of the suspension-floating-circulating fluidized combustion technology were introduced in detail in this paper. A 130 t/h CFBB was retrofitted based on the technology, and the retrofitted system mainly includes a long-distance transport sub-system, a bed-material conveying sub-system with a wind-seal device invented by the authors, a superheater thermoregulation device using a novel temperature regulator, a return loop flu- idization facility, and a pneumatic ash conveying sub-system with sealed pump. The achieved performance of the retro- fitted CFBB shows that the thermal efficiency is 89.83 %, the combustion efficiency is 96.24 %, and the blending proportion of slurry is 94 %.展开更多
The microwave photonic technology-based Ultra-Wideband (UWB) Radio over Fiber (RoF) system is an important solution to the future low-cost and high-performance ultra-wideband wireless access network.Much research work...The microwave photonic technology-based Ultra-Wideband (UWB) Radio over Fiber (RoF) system is an important solution to the future low-cost and high-performance ultra-wideband wireless access network.Much research work has been done in this field with abundant results.This article introduces the RoF system that is based on the all-optical vector modulation technology to further enhance signal’s spectrum efficiency;the full-duplex RoF system that is based on the millimeter wave Phase-Shift Keying (PSK) modulation to greatly simplify base station structure and fiber layout;and the RoF system that is based on multi-service mixed transmission to carry the service with both wired signal and several wireless signals.The article also presents an RoF-based high-definition video transmission platform.展开更多
Purpose–The intelligent Central Traffic Control(CTC)system plays a vital role in establishing an intelligent high-speed railway(HSR)system.As the core of HSR transportation command,the intelligent CTC system is a new...Purpose–The intelligent Central Traffic Control(CTC)system plays a vital role in establishing an intelligent high-speed railway(HSR)system.As the core of HSR transportation command,the intelligent CTC system is a new HSR dispatching command system that integrates the widely used CTC in China with the practical service requirements of intelligent dispatching.This paper aims to propose key technologies and applications for intelligent dispatching command in HSR in China.Design/methodology/approach–This paper first briefly introduces the functions and configuration of the intelligent CTC system.Some new servers,terminals and interfaces are introduced,which are plan adjustment server/terminal,interface for automatic train operation(ATO),interface for Dynamic Monitoring System of Train Control Equipment(DMS),interface for Power Supervisory Control and Data Acquisition(PSCADA),interface for Disaster Monitoring,etc.Findings–The key technologies applied in the intelligent CTC system include automatic adjustment of train operation plans,safety control of train routes and commands,traffic information data platform,integrated simulation of traffic dispatching and ATO function.These technologies have been applied in the Beijing-Zhangjiakou HSR,which commenced operations at the end of 2019.Implementing these key intelligent functions has improved the train dispatching command capacity,ensured the safe operation of intelligent HSR,reduced the labor intensity of dispatching operators and enhanced the intelligence level of China’s dispatching system.Originality/value–This paper provides further challenges and research directions for the intelligent dispatching command of HSR.To achieve the objectives,new measures need to be conducted,including the development of advanced technologies for intelligent dispatching command,coping with new requirements with the development of China’s railway signaling system,the integration of traffic dispatching and train control and the application of AI and data-driven modeling and methods.展开更多
Building HVAC equipment installation is vital for indoor comfort,energy efficiency,and environmental quality.Key technologies like vibration control,pipe network alignment,and thermal stress compensation,along with a ...Building HVAC equipment installation is vital for indoor comfort,energy efficiency,and environmental quality.Key technologies like vibration control,pipe network alignment,and thermal stress compensation,along with a multi-faceted quality standards framework,are crucial.Effective process management,practical application analysis,and the integration of robotics,IoT,and AI enhance quality and efficiency.Sustainable development strategies and lifecycle-oriented quality management are also essential for future progress.展开更多
Shale gas resources in the Lower Silurian Longmaxi,southern Sichuan Basin,are huge,where,the geological setting,unlike that in North America,is quite complicated and ground surface infrastructure is poor.Therefore,ada...Shale gas resources in the Lower Silurian Longmaxi,southern Sichuan Basin,are huge,where,the geological setting,unlike that in North America,is quite complicated and ground surface infrastructure is poor.Therefore,adaptable key technologies will be essential to achieve commercial exploitation of shale gas there.In the case study of the Changning-Weiyuan National Shale Gas Demonstration Zone,six series of key techniques were summarized in comprehensive geological evaluation,development optimization,fast and superior drilling of horizontal wells,horizontal-well volumetric fracturing,cluster-well and factory-like operation in well blocks,and highly-efficient and clean exploitation.The above techniques were applied in this field after three rounds of adjustment and optimization,the resulted production rates of shale gas wells were getting higher and higher and the single-well estimated ultimate recovery(EUR)was also rising.Compared with that in the first round,the average EUR of wells in the third round was increased by 128%.In conclusion,the application practices prove that the above series of key techniques with adaptation and flexibility provide a robust technical support for the rapid output of shale gas production in South Sichuan Basin.展开更多
In recent years,great efforts have been made on the geoparks’ application and construction,but there is a shortage of research on the theories and methodologies of geoheritage investigation and assessment. Based on t...In recent years,great efforts have been made on the geoparks’ application and construction,but there is a shortage of research on the theories and methodologies of geoheritage investigation and assessment. Based on the summaries of having finished geoheritage investtigation and assessment and geopark construction projects,some key technologic methods analyzed in this paper are as follows:(1)展开更多
According to different applications,the performance parameters of the several Geo-Electromagnetic Magnetic Induction Sensors( GEMISs) which are the most representative in the world are compared. After discussing the s...According to different applications,the performance parameters of the several Geo-Electromagnetic Magnetic Induction Sensors( GEMISs) which are the most representative in the world are compared. After discussing the several key technologies for improving the performance of GEMISs,the main conclusions are as follows: the application bandwidth can be expanded by adopting flux negative feedback( 1 m Hz-10 k Hz);"laminated"core structure is useful for suppressing eddy current loss; the effective permeability of the core has increased observably after adding flux concentrators to the two ends of the core; the chopper amplifier is a useful method to suppress 1/f noise for reducing the GEMIS's output noise; the indoor calibration scheme based on"long straight solenoid"proposed to obtain sensor sensitivity. Accordingly,the problem how to reduce the noise of GEMIS is urgent need to be solved,which will improve the performance of GEMIS. And there is plenty of work requires further study on parameters ' optimization of coil and core. In the future,miniaturization,intelligence and three-axis measurement are the development directions of GEMIS.展开更多
文摘The key technology of semi-continuous conveyor system decides the successful using of this system. The key technology includes optimal initial building depth of this system,the crusher moving step and the layout of conveyor system are studied, and their calculating models are built up.
基金Supported by the Fund for Independent Innovation of Agricultural Sciences in Jiangsu Province(CX(14)2108&CX(13)5066)~~
文摘A low-power environmental monitoring system based on WSN technology is proposed to effectively monitor the environmental status and ensure the healthy growth of greenhouse crops in the greenhouse. The system performs dynamic mon- itoring on the environmental data of temperature, humidity, illumination, soil tempera- ture and humidity of the greenhouse, and it reduces the energy consumption by us- ing solar energy and lithium battery as the power supply mode and dynamic power management algorithm combined with improved routing protocol. Stable and reliable, the system could effectively monitor the key environmental factors in the green- house, making it of certain promotion value.
基金Supported by Demonstration and Promotion Project of Shanghai Municipal Committee of Agriculture[HNKT(2015)2-7]Jiangsu Agricultural"Three New Engineering"Project[SXGC(2017)208]Jiangsu Agricultural Science and Technology Innovation Fund[CX(15)1029]~~
文摘In order to develop green good, reduce the use of chemical fertilizer and pesticide, realize ＂double reduction＂ and synergism, improve safety and quality of products, protect the ecological environment and promote the healthy and steady development of strawberry industry, the goals and key technology of fertilizer-pesticide ＂double reduction＂ and synergism for greenhouse strawberry are summed up in this paper targeting at the current situation of strawberry production and combined with the new technology achievements at home and abroad. The key technology includes six items： healthy seedling cultivating technique, soil improvement and continuous cropping obstacle treatment technique, agricultural ecological prevention tech- nique, physicochemical trap of pest control technique, biological control technique and low residual risk chemical control technique.
文摘On-site inspection of municipal road subgrade and pavement is of great significance for ensuring the quality,safety,and durability of urban road infrastructure.This paper analyzes its key technologies,introduces non-destructive testing methods such as ground-penetrating radar and ultrasonic testing,elaborates on the multifaceted roles of inspection in engineering construction as well as relevant standards,explores site challenges,key technologies,and corresponding measures,and points out future research directions in intelligent sensing and predictive maintenance.
基金supported by the State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications (Grant No. IPOC2021ZT10)the National Natural Science Foundation of China (Grant No. 11904333)+1 种基金the Fundamental Research Funds for the Central Universities (Grant No. 2019XD-A02)BUPT Innovation and Entrepreneurship Support Program (Grant No. 2022YC-T051)。
文摘Quantum key distribution(QKD) generates information-theoretical secret keys between two parties based on the physical laws of quantum mechanics. Following the advancement in quantum communication networks, it becomes feasible and economical to combine QKD with classical optical communication through the same fiber using dense wavelength division multiplexing(DWDM) technology. This study proposes a detailed scheme of TF-QKD protocol with DWDM technology and analyzes its performance, considering the influence of quantum channel number and adjacent quantum crosstalk on the secret key rates. The simulation results show that the scheme further increases the secret key rate of TF-QKD and its variants. Therefore, this scheme provides a method for improving the secret key rate for practical quantum networks.
文摘At present, with the rapid development of science and technology, based on the requirements of weapon test and identification tasks, the experimental data acquisition and processing space station, which is suitable for a variety of extreme natural environments such as alpine, plateau, mountain, jungle, desert, island and reef, has been studied theoretically and in practice. The space station is a dome-shaped structure with scale-shaped modules and basalt reinforced fiber composite materials, providing thermal insulation, ventilation and continuous power supply. It can provide support and guarantee for the real-time monitoring, recovery and information transmission of test data, and meet the basic work and life needs of test personnel.
文摘On October 14, two satellites SJ-9A/B were sent into their preset orbits by a LM-2C/SMA launch vehicle, which is the first flight of a series of China's civilian technology experimental satellites. SJ-9A and B are the first two satellites in the series of civilian technology experimental satellites designed for tests such as long lifetime and high reliability, high precision and high performance of satellite, domestically developed core components, satellite formation
基金supported by the key project of the United Foun-dation of National NaturalScience Foundation of China“Basic Research on Volumetric Acid Fracturing of Deep Sulfur-bearing Carbonate Gas Reservoirs in Sichuan Basin”(No.U21A20105)CNPC Science and Technology Innovation Project"Research on the Mechanism of Complex Fracture Propagation and Control Measures of Temporary Plugging Fracturing of Shale Gas Reservoir"(No.2020D-5007-0208).
文摘There are abundant tight sandstone gas resources in the Sichuan Basin,which are the important objects of reserve and production increase and large-scale development.Due to their discontinuous sandbody distribution,narrow channels,and strong horizontal and vertical heteroge-neity,however,conventional fracturing technologies cannot achieve the ideal stimulation effect here.In order to address this difficulty,this paper dissects the geology engineering characteristics of tight sandstone gas reservoirs in the western Sichuan Basin.Starting from the seepage mechanics theory,the concept of“multi-scale high-density”tight gas fracturing technology is put forward by fully referring to the experience of previous multi-round reservoir stimulation in the western Sichuan Basin and the idea of unconventional volume fracturing technology.In addition,its conceptual connotation,key technologies and implementation effects are illustrated.The following research results are obtained.First,the seepage characteristics make it necessary for the efficient production of tight gas reserves to increase fracture density and stimulated reservoir volume(SRV).Second,the“multi-scale high-density”fracturing technology emphasizes the rationality of high-density hydraulic fracture creation and the matching of multi-scale fractureflow capacity,and aims at establishing a multi-level fracture system with effective and steady gasflow in tight reservoirs through fracturing.Third,the“wide,dense,support,stable,and precise”fracturing technology is applied to improve single well production and estimated ultimate recovery(EUR).Fourth,the engineering practice of“multi-scale high-density”fracturing technology in the tight reservoirs of Jurassic Shaximiao Formation and Triassic Xujiahe Formation in the ZJ Gas Field realizes the average single well production rate of 15.6104 m3/d,which is 1.96 times higher than that before the stimulation.Obviously,it provides powerful support for the operation of the ZJ Gas Field into a giant gasfield with the reserves of 100 billion cubic meters.In conclusion,the formation of the concept and key technologies of“multi-scale high-density”fracturing technology effectively supports the efficient development of tight gas in the western Sichuan Basin and points out the following research direction of tight gas reservoir stimulation.The research results provide reference and guidance for the large-scale benefit development of tight gas in China.
基金The National Key Research and Development Program of China under contract No.2022YFC3104200the Key R&D Program of Shandong Province,China under contract No.2023ZLYS01+3 种基金the Consulting and Research Project of the Chinese Academy of Engineering under contract Nos 2022-XY-21,2022-DFZD-35,2023-XBZD-09 and 2021-XBZD-13the Major Innovation Special Project of Qilu University of Technology(Shandong Academy of Sciences),Science Education Industry Integration Pilot Project under contract No.2023HYZX01Special Funds for“Mount Taishan Scholars”Construction Projectthe Special Funds of Laoshan Laboratory.
文摘In China,operational in-situ marine monitoring is the primary means of directly obtaining hydrological,meteorological,and oceanographic environmental parameters across sea areas,and it is essential for applications such as forecast of marine environment,prevention and mitigation of disaster,exploitation of marine resources,marine environmental protection,and management of transportation safety.In this paper,we summarise the composition,development courses,and present operational status of three systems of operational in-situ marine monitoring,namely coastal marine automated network station,ocean data buoy and voluntary observing ship measuring and reporting system.Additionally,we discuss the technical development in these in-situ systems and achievements in the key generic technologies along with future development trends.
基金Shanghai Science and Technology Foundation of China (No.021111125)
文摘This paper presented a new-type CNC curve grinding machine, in order to conquer the disadvantages of conventional NC curve grinding machine and improve surface quality, dimensional accuracy and machining efficiency. The new-type grinder adopts some high and new technologies: ① the normal tracing device could make grinding wheel coincide with the normal direction of the machining points in work piece, and improve surface quality and dimensional accuracy; ② the digital image on-line recognition system could monitor machining process and compensate wheel wear in real time; ③ linear motor drive mechanism could realize the exact adjustment of the grinding head digitally and increase the machining efficiency. The math models of normal tracing and circular tolerance zone were presented. The experimental results show that the new-type CNC curve grinding machine equipped with the three devices mentioned above is easy to realize the precision grinding of any complex curve, and improve surface quality, dimensional accuracy and machining efficiency.
文摘To understand the resource features and geology in the deep Jinchuan nickel deposit, difficult geological conditions were systematically analyzed, including high stress, fragmentized ore rock, prevalent deformation, difficult tunnel support, complicated rock mechanics, and low mining recovery. An integrated technology package was built for safe, efficient, and continuous mining in a deep, massive, and complex nickel and cobalt mine. This was done by the invention of a large-area continuous mining method with honeycomb drives; the establishment of ground control theory and a technology package for high-stress and fragmented ore rock： and the development of a new type of backfilling cement material, along with a deep backfilling technology that comprises the pipeline transport of high-density slurry with coarse aggregates. In this way, good solutions to existing problems were found to permit the efficient exploitation and comprehensive utilization of the resources in the deep Jinchuan nickel mine. In addition, a technological demonstration in an underground mine was performed using the cemented undercut-and-fill mining method for stressful, frag- mented, and rheological rock.
文摘The pipeline all-position automatic welding machine system is a special welding system for automatically welding circumferential joint of pipeline on site, which has been widely used to the long-distance pipeline construction projects due to the advantages of automatic control for welding parameters at all-position, moving speed of bugs and operating. In this paper, the key control technologies of PAWM all-position automatic welding machine （ developed by Pipeline Research Institute of CNPC） such us the automatic control system, control software, personal digital assistant （PDA） software and complex programmable logic device （ CPLD ） program as well us the control method of welding parameter have been described detailedly. With the higher welding quality, higher welding effwiency and lower labor intensity, PA WM all-position automatic welding machine has been successfully applied in many famous pipeline construction projects.
文摘A novel suspension-floating-circulating fluidized combustion technology is proposed for burning coal slurry fuel in traditional circulating ftuidized bed boilers （CFBB）. This technology can solve some existing problems in large- capacity CFBB burning coal slurry. The principles of the suspension-floating-circulating fluidized combustion technology were introduced in detail in this paper. A 130 t/h CFBB was retrofitted based on the technology, and the retrofitted system mainly includes a long-distance transport sub-system, a bed-material conveying sub-system with a wind-seal device invented by the authors, a superheater thermoregulation device using a novel temperature regulator, a return loop flu- idization facility, and a pneumatic ash conveying sub-system with sealed pump. The achieved performance of the retro- fitted CFBB shows that the thermal efficiency is 89.83 %, the combustion efficiency is 96.24 %, and the blending proportion of slurry is 94 %.
基金supported by the National High Technology Research and Development Program("863" Program)under Grant No.2007AA01Z264 and 2006AA01Z256the National Natural Science Foundation under Grant No.60736002 and 60702006
文摘The microwave photonic technology-based Ultra-Wideband (UWB) Radio over Fiber (RoF) system is an important solution to the future low-cost and high-performance ultra-wideband wireless access network.Much research work has been done in this field with abundant results.This article introduces the RoF system that is based on the all-optical vector modulation technology to further enhance signal’s spectrum efficiency;the full-duplex RoF system that is based on the millimeter wave Phase-Shift Keying (PSK) modulation to greatly simplify base station structure and fiber layout;and the RoF system that is based on multi-service mixed transmission to carry the service with both wired signal and several wireless signals.The article also presents an RoF-based high-definition video transmission platform.
基金This work was supported in part by the National Natural Science Foundation of China under Grant 62203468Young Elite Scientist Sponsorship Program by CAST under Grant 2022QNRC001+1 种基金Foundation of China State Railway Group Co.,Ltd.under Grant K2021X001Foundation of China Academy of Railway Sciences Corporation Limited under Grant 2021YJ315.
文摘Purpose–The intelligent Central Traffic Control(CTC)system plays a vital role in establishing an intelligent high-speed railway(HSR)system.As the core of HSR transportation command,the intelligent CTC system is a new HSR dispatching command system that integrates the widely used CTC in China with the practical service requirements of intelligent dispatching.This paper aims to propose key technologies and applications for intelligent dispatching command in HSR in China.Design/methodology/approach–This paper first briefly introduces the functions and configuration of the intelligent CTC system.Some new servers,terminals and interfaces are introduced,which are plan adjustment server/terminal,interface for automatic train operation(ATO),interface for Dynamic Monitoring System of Train Control Equipment(DMS),interface for Power Supervisory Control and Data Acquisition(PSCADA),interface for Disaster Monitoring,etc.Findings–The key technologies applied in the intelligent CTC system include automatic adjustment of train operation plans,safety control of train routes and commands,traffic information data platform,integrated simulation of traffic dispatching and ATO function.These technologies have been applied in the Beijing-Zhangjiakou HSR,which commenced operations at the end of 2019.Implementing these key intelligent functions has improved the train dispatching command capacity,ensured the safe operation of intelligent HSR,reduced the labor intensity of dispatching operators and enhanced the intelligence level of China’s dispatching system.Originality/value–This paper provides further challenges and research directions for the intelligent dispatching command of HSR.To achieve the objectives,new measures need to be conducted,including the development of advanced technologies for intelligent dispatching command,coping with new requirements with the development of China’s railway signaling system,the integration of traffic dispatching and train control and the application of AI and data-driven modeling and methods.
文摘Building HVAC equipment installation is vital for indoor comfort,energy efficiency,and environmental quality.Key technologies like vibration control,pipe network alignment,and thermal stress compensation,along with a multi-faceted quality standards framework,are crucial.Effective process management,practical application analysis,and the integration of robotics,IoT,and AI enhance quality and efficiency.Sustainable development strategies and lifecycle-oriented quality management are also essential for future progress.
基金Project supported by the“Changning-Weiyuan Shale Gas Development Demonstration Project”subordinate to the National Major Science and Technology Project“Development of Large Oil/gas Fields and Coalbed Methane”(No.:2016ZX05062)PetroChina Major Science and Technology Project(No.:2016E-0611).
文摘Shale gas resources in the Lower Silurian Longmaxi,southern Sichuan Basin,are huge,where,the geological setting,unlike that in North America,is quite complicated and ground surface infrastructure is poor.Therefore,adaptable key technologies will be essential to achieve commercial exploitation of shale gas there.In the case study of the Changning-Weiyuan National Shale Gas Demonstration Zone,six series of key techniques were summarized in comprehensive geological evaluation,development optimization,fast and superior drilling of horizontal wells,horizontal-well volumetric fracturing,cluster-well and factory-like operation in well blocks,and highly-efficient and clean exploitation.The above techniques were applied in this field after three rounds of adjustment and optimization,the resulted production rates of shale gas wells were getting higher and higher and the single-well estimated ultimate recovery(EUR)was also rising.Compared with that in the first round,the average EUR of wells in the third round was increased by 128%.In conclusion,the application practices prove that the above series of key techniques with adaptation and flexibility provide a robust technical support for the rapid output of shale gas production in South Sichuan Basin.
文摘In recent years,great efforts have been made on the geoparks’ application and construction,but there is a shortage of research on the theories and methodologies of geoheritage investigation and assessment. Based on the summaries of having finished geoheritage investtigation and assessment and geopark construction projects,some key technologic methods analyzed in this paper are as follows:(1)
基金Sponsored by the National Natural Science Foundation of China(Grant No.41274183)the Science and Technology Department of Jilin Province(Grant No.20150520095JH)
文摘According to different applications,the performance parameters of the several Geo-Electromagnetic Magnetic Induction Sensors( GEMISs) which are the most representative in the world are compared. After discussing the several key technologies for improving the performance of GEMISs,the main conclusions are as follows: the application bandwidth can be expanded by adopting flux negative feedback( 1 m Hz-10 k Hz);"laminated"core structure is useful for suppressing eddy current loss; the effective permeability of the core has increased observably after adding flux concentrators to the two ends of the core; the chopper amplifier is a useful method to suppress 1/f noise for reducing the GEMIS's output noise; the indoor calibration scheme based on"long straight solenoid"proposed to obtain sensor sensitivity. Accordingly,the problem how to reduce the noise of GEMIS is urgent need to be solved,which will improve the performance of GEMIS. And there is plenty of work requires further study on parameters ' optimization of coil and core. In the future,miniaturization,intelligence and three-axis measurement are the development directions of GEMIS.
