For the two newly launched satellites(PRN number 27 and 28) of the future global BeiDou navigation satellite system(BDS-3), there is no available broadcast ephemeris data and other initial orbit information, but the i...For the two newly launched satellites(PRN number 27 and 28) of the future global BeiDou navigation satellite system(BDS-3), there is no available broadcast ephemeris data and other initial orbit information, but the initial orbit is the fundamental of the comprehensive analysis of the satellites and their signals. Precise orbit determination(POD) also requires determination of a priori initial value with a certain precision in order to avoid problems such as filter divergence during POD. Compared with the Newton iteration method, which relies on the initial value, this study utilizes the Bancroft algorithm to directly solve the nonlinear equations with the advantage of numerical stability. The initial orbits of these two satellites are calculated based on new code signals, and their results are analyzed and discussed. The experimental results show that, with the exception of very few epochs, when the new code signal is utilized, the median and robust variance factor of the observed residuals computed using pseudo-range observations and the solved initial orbits are less than 4 and 2 m, respectively. It also shows that this solution can be used for rapid initial orbit recovery after maneuvers of the new BeiDou satellites.展开更多
With the development of socialism market economy, the former Bar Code ForCommodity Management Measures (being called Old Measures for short hereafter) issued by the NationalBureau of Quality and Technical Supervision ...With the development of socialism market economy, the former Bar Code ForCommodity Management Measures (being called Old Measures for short hereafter) issued by the NationalBureau of Quality and Technical Supervision can not adapt to the requirement of managing for barcode for commodity. Therefore, for the purpose of standardize bar code for commodity managementstandard, ensuring its quality, speeding up the application of it in electronic business andcirculating field and accelerating the course of being a well informed country, a new Bar Code ForCommodity Management Measures (New Measures for short) has been issued by the General Administratorof Quality Supervision, Inspection and Quarantine of P.R. China (AQSIQ) on May 30th, 2005, and putinto force in October, 2005. At the same time, the Old Measures issued on July 3rd, 1998 has beenabolished.展开更多
The sUdeway design is the key in the design of the disc vibrating feeder. However, no reliable theoretical guidance has come into existence, which greatly restricted the application of CAD（ Computer-aided design）. I...The sUdeway design is the key in the design of the disc vibrating feeder. However, no reliable theoretical guidance has come into existence, which greatly restricted the application of CAD（ Computer-aided design）. In order to feed the application of CAD technology, we must make improvements to the existing coding method. Based on the similarity principle of Group Technology and existing coding system, a new coding method applicable to slide- way design is brought forward. The existing coding system could get optimized by means of analysing and studying the influence imposed by the parts＇ shape and posture features. More detailed information about the parts could be supplied by the new coding system, which makes the design simpler, more convenient and more accurate with the subjoin of the initial and targeted codes.展开更多
The chemistry of sulfur cycle contributes significantly to the atmospheric nucleation process,which is the first step of new particle formation(NPF).In the present study,cycloaddition reaction mechanism of sulfur trio...The chemistry of sulfur cycle contributes significantly to the atmospheric nucleation process,which is the first step of new particle formation(NPF).In the present study,cycloaddition reaction mechanism of sulfur trioxide(SO_(3))to hydrogen sulfide(H_(2)S)which is a typical air pollutant and toxic gas detrimental to the environment were comprehensively investigate through theoretical calculations and Atmospheric Cluster Dynamic Code simulations.Gas-phase stability and nucleation potential of the product thiosulfuric acid(H_(2)S_(2)O_(3),TSA)were further analyzed to evaluate its atmospheric impact.Without any catalysts,the H_(2)S+SO_(3)reaction is infeasible with a barrier of 24.2 kcal/mol.Atmospheric nucleation precursors formic acid(FA),sulfuric acid(SA),and water(H_(2)O)could effectively lower the reaction barriers as catalysts,even to a barrierless reaction with the efficiency of cis-SA>trans-FA>trans-SA>H_(2)O.Subsequently,the gas-phase stability of TSA was investigated.A hydrolysis reaction barrier of up to 61.4 kcal/mol alone with an endothermic isomerization reaction barrier of 5.1 kcal/mol under the catalytic effect of SA demonstrates the sufficient stability of TSA.Furthermore,topological and kinetic analysis were conducted to determine the nucleation potential of TSA.Atmospheric clusters formed by TSA and atmospheric nucleation precursors(SA,ammonia NH_(3),and dimethylamine DMA)were thermodynamically stable.Moreover,the gradually decreasing evaporation coefficients for TSA-base clusters,particularly for TSA-DMA,suggests that TSA may participate in NPF where the concentration of base molecules are relatively higher.The present new reaction mechanismmay contributes to a better understanding of atmospheric sulfur cycle and NPF.展开更多
Network processing in the current Internet is at the entirety of the data packet,which is problematic when encountering network congestion.The newly proposed Internet service named Qualitative Communication changes th...Network processing in the current Internet is at the entirety of the data packet,which is problematic when encountering network congestion.The newly proposed Internet service named Qualitative Communication changes the network processing paradigm to an even finer granularity,namely chunk level,which obsoletes many existing networking policies and schemes,especially the caching algorithms and cache replacement policies that have been extensively explored in Web Caching,Content Delivery Networks(CDN)or Information-Centric Networks(ICN).This paper outlines all the new factors that are brought by random linear network coding-based Qualitative Communication and proves the importance and necessity of considering them.A novel metric is proposed by taking these new factors into consideration.An optimization problem is formulated to maximize the metric value of all retained chunks in the local storage of network nodes under the constraint of storage limit.A cache replacement scheme that obtains the optimal result in a recursive manner is proposed correspondingly.With the help of the introduced intelligent cache replacement algorithm,the performance evaluations show remarkably reduced end-to-end latency compared to the existing schemes in various network scenarios.展开更多
The present paper seeks to shed light on the main factors lying behind the non-implementation of Article 20 of the New Moroccan Family Law reformed in 2004 which is concerned with legal minimum age of marriage for bot...The present paper seeks to shed light on the main factors lying behind the non-implementation of Article 20 of the New Moroccan Family Law reformed in 2004 which is concerned with legal minimum age of marriage for both sexes, 18 years old for both. This study aims at investigating why the number of marriages of young girls continue to increase despite the establishment of the Law. The author takes the region of Fez as a case in point to explore this social behavior in Moroccan society. A qualitative approach has been adopted by interviewing 10 persons including Family Affairs Judges, lawyers and University Professors of Islamic studies at the University of Fez. Added to this, the technique of observation has equally been utilized to have everyday life concrete experiences of young girls ＂marriages＂. It has been argued that a unilateral approach to this social phenomenon cannot succeed to understand the complex nature of this bad social habit that is still predominant among rural areas and marginalized urban districts. A rather global approach taking into account the economic, socio-cultural, and legal dimension of the issue under investigation proves to be much more adequate to explore the intricate nature of this problems in which a number of diverse variables interact. The paper ends up with a conclusion and a number of recommendations on how to reduce this social act.展开更多
This paper briefly introduces the development process,technical content and focus of ISO/TS 7352,Freight Container-NFC or/and QR code seals,which is a project carried out by East China Normal University and submitted ...This paper briefly introduces the development process,technical content and focus of ISO/TS 7352,Freight Container-NFC or/and QR code seals,which is a project carried out by East China Normal University and submitted through Standardization Administration of China(SAC).The successful development of this technical specification will greatly enhance container identification and communication technology.展开更多
提出多平台适配编码技术方案,通过动态码率分配、分辨率自适应与智能参数调优实现高效跨终端适配。技术原理上,基于H.264/H.265/AV1编码标准兼容性分析,构建场景感知的动态码率控制模型,结合关键区域(Region Of Interest,ROI)优先编码...提出多平台适配编码技术方案,通过动态码率分配、分辨率自适应与智能参数调优实现高效跨终端适配。技术原理上,基于H.264/H.265/AV1编码标准兼容性分析,构建场景感知的动态码率控制模型,结合关键区域(Region Of Interest,ROI)优先编码与人工智能驱动的量化参数(Quantizer Parameter,QP)调整,优化画质与带宽平衡;实现方法上,设计多标准并行编码框架与边缘计算协同分发网络,通过开源框架模块化扩展、容器化封装及快速UDP网络连接(Quick UDP Internet Connections,QUIC)协议低延迟传输,降低跨平台适配复杂度。展开更多
基金supported by the Collaborative Precision Positioning Project funded by the Ministry of Science and Technology of China (No.2016YFB0501900)China Natural Science Funds (No.41231064,41674022,41574015)
文摘For the two newly launched satellites(PRN number 27 and 28) of the future global BeiDou navigation satellite system(BDS-3), there is no available broadcast ephemeris data and other initial orbit information, but the initial orbit is the fundamental of the comprehensive analysis of the satellites and their signals. Precise orbit determination(POD) also requires determination of a priori initial value with a certain precision in order to avoid problems such as filter divergence during POD. Compared with the Newton iteration method, which relies on the initial value, this study utilizes the Bancroft algorithm to directly solve the nonlinear equations with the advantage of numerical stability. The initial orbits of these two satellites are calculated based on new code signals, and their results are analyzed and discussed. The experimental results show that, with the exception of very few epochs, when the new code signal is utilized, the median and robust variance factor of the observed residuals computed using pseudo-range observations and the solved initial orbits are less than 4 and 2 m, respectively. It also shows that this solution can be used for rapid initial orbit recovery after maneuvers of the new BeiDou satellites.
文摘With the development of socialism market economy, the former Bar Code ForCommodity Management Measures (being called Old Measures for short hereafter) issued by the NationalBureau of Quality and Technical Supervision can not adapt to the requirement of managing for barcode for commodity. Therefore, for the purpose of standardize bar code for commodity managementstandard, ensuring its quality, speeding up the application of it in electronic business andcirculating field and accelerating the course of being a well informed country, a new Bar Code ForCommodity Management Measures (New Measures for short) has been issued by the General Administratorof Quality Supervision, Inspection and Quarantine of P.R. China (AQSIQ) on May 30th, 2005, and putinto force in October, 2005. At the same time, the Old Measures issued on July 3rd, 1998 has beenabolished.
文摘The sUdeway design is the key in the design of the disc vibrating feeder. However, no reliable theoretical guidance has come into existence, which greatly restricted the application of CAD（ Computer-aided design）. In order to feed the application of CAD technology, we must make improvements to the existing coding method. Based on the similarity principle of Group Technology and existing coding system, a new coding method applicable to slide- way design is brought forward. The existing coding system could get optimized by means of analysing and studying the influence imposed by the parts＇ shape and posture features. More detailed information about the parts could be supplied by the new coding system, which makes the design simpler, more convenient and more accurate with the subjoin of the initial and targeted codes.
基金supported by the Budget Surplus of Central Financial Science and Technology Plan (No.2021-JY-14)the Project funded by China Postdoctoral Science Foundation (No.2020M680636)+3 种基金the Fundamental Research Funds for Central Public Welfare Scientific Research Institutes of China,Chinese Research Academy of Environmental Sciences (Nos.2022YSKY-21 and 2022YSKY-27)the National Natural Science Foundation of China (No.41375133)the Science Foundation of Chinese Research Academy of Environmental Sciences (No.JY-41375133)Tian He Qingsuo Project-special fund project.
文摘The chemistry of sulfur cycle contributes significantly to the atmospheric nucleation process,which is the first step of new particle formation(NPF).In the present study,cycloaddition reaction mechanism of sulfur trioxide(SO_(3))to hydrogen sulfide(H_(2)S)which is a typical air pollutant and toxic gas detrimental to the environment were comprehensively investigate through theoretical calculations and Atmospheric Cluster Dynamic Code simulations.Gas-phase stability and nucleation potential of the product thiosulfuric acid(H_(2)S_(2)O_(3),TSA)were further analyzed to evaluate its atmospheric impact.Without any catalysts,the H_(2)S+SO_(3)reaction is infeasible with a barrier of 24.2 kcal/mol.Atmospheric nucleation precursors formic acid(FA),sulfuric acid(SA),and water(H_(2)O)could effectively lower the reaction barriers as catalysts,even to a barrierless reaction with the efficiency of cis-SA>trans-FA>trans-SA>H_(2)O.Subsequently,the gas-phase stability of TSA was investigated.A hydrolysis reaction barrier of up to 61.4 kcal/mol alone with an endothermic isomerization reaction barrier of 5.1 kcal/mol under the catalytic effect of SA demonstrates the sufficient stability of TSA.Furthermore,topological and kinetic analysis were conducted to determine the nucleation potential of TSA.Atmospheric clusters formed by TSA and atmospheric nucleation precursors(SA,ammonia NH_(3),and dimethylamine DMA)were thermodynamically stable.Moreover,the gradually decreasing evaporation coefficients for TSA-base clusters,particularly for TSA-DMA,suggests that TSA may participate in NPF where the concentration of base molecules are relatively higher.The present new reaction mechanismmay contributes to a better understanding of atmospheric sulfur cycle and NPF.
文摘Network processing in the current Internet is at the entirety of the data packet,which is problematic when encountering network congestion.The newly proposed Internet service named Qualitative Communication changes the network processing paradigm to an even finer granularity,namely chunk level,which obsoletes many existing networking policies and schemes,especially the caching algorithms and cache replacement policies that have been extensively explored in Web Caching,Content Delivery Networks(CDN)or Information-Centric Networks(ICN).This paper outlines all the new factors that are brought by random linear network coding-based Qualitative Communication and proves the importance and necessity of considering them.A novel metric is proposed by taking these new factors into consideration.An optimization problem is formulated to maximize the metric value of all retained chunks in the local storage of network nodes under the constraint of storage limit.A cache replacement scheme that obtains the optimal result in a recursive manner is proposed correspondingly.With the help of the introduced intelligent cache replacement algorithm,the performance evaluations show remarkably reduced end-to-end latency compared to the existing schemes in various network scenarios.
文摘The present paper seeks to shed light on the main factors lying behind the non-implementation of Article 20 of the New Moroccan Family Law reformed in 2004 which is concerned with legal minimum age of marriage for both sexes, 18 years old for both. This study aims at investigating why the number of marriages of young girls continue to increase despite the establishment of the Law. The author takes the region of Fez as a case in point to explore this social behavior in Moroccan society. A qualitative approach has been adopted by interviewing 10 persons including Family Affairs Judges, lawyers and University Professors of Islamic studies at the University of Fez. Added to this, the technique of observation has equally been utilized to have everyday life concrete experiences of young girls ＂marriages＂. It has been argued that a unilateral approach to this social phenomenon cannot succeed to understand the complex nature of this bad social habit that is still predominant among rural areas and marginalized urban districts. A rather global approach taking into account the economic, socio-cultural, and legal dimension of the issue under investigation proves to be much more adequate to explore the intricate nature of this problems in which a number of diverse variables interact. The paper ends up with a conclusion and a number of recommendations on how to reduce this social act.
基金financially supported by the“Technological Innovation Action Plan”Technical Standards Project of Shanghai Municipality(20DZ2205300)
文摘This paper briefly introduces the development process,technical content and focus of ISO/TS 7352,Freight Container-NFC or/and QR code seals,which is a project carried out by East China Normal University and submitted through Standardization Administration of China(SAC).The successful development of this technical specification will greatly enhance container identification and communication technology.
文摘提出多平台适配编码技术方案,通过动态码率分配、分辨率自适应与智能参数调优实现高效跨终端适配。技术原理上,基于H.264/H.265/AV1编码标准兼容性分析,构建场景感知的动态码率控制模型,结合关键区域(Region Of Interest,ROI)优先编码与人工智能驱动的量化参数(Quantizer Parameter,QP)调整,优化画质与带宽平衡;实现方法上,设计多标准并行编码框架与边缘计算协同分发网络,通过开源框架模块化扩展、容器化封装及快速UDP网络连接(Quick UDP Internet Connections,QUIC)协议低延迟传输,降低跨平台适配复杂度。
