In this paper,we present a novel first-order digitalΣΔconverter tailored for digital-to-analog applications,focusing on achieving both high yield and reduced silicon estate.Our approach incorporates a substantial le...In this paper,we present a novel first-order digitalΣΔconverter tailored for digital-to-analog applications,focusing on achieving both high yield and reduced silicon estate.Our approach incorporates a substantial level of dithering noise into the input signal,strategically aimed at mitigating the spurious frequencies commonly encountered in such converters.Validation of our design is performed through simulations using a high-level simulator specialized in mixed-signal circuit analysis.The results underscore the enhanced performance of our circuit,especially in reducing spurious frequencies,highlighting its efficiency and effectiveness.The final circuit exhibits an effective number of bits of 13.展开更多
To have effective water resource management,the distributed hydrological models are commonly applied for supporting the decision-making processes.Among different inputs,the spatial distributed rainfall plays significa...To have effective water resource management,the distributed hydrological models are commonly applied for supporting the decision-making processes.Among different inputs,the spatial distributed rainfall plays significant role in those model simulations.Many interpolation methods have been developed for generating distributed rainfall based on measurement samples.However,depending on the catchment characteristics and data availability,the suitable interpolation algorithm is case-dependent.This paper presents one operational approach for determining the resonable interpolation algorithm in a complex large catchment(Var catchment,France).Based on the daily rainfall data(2008–2014)collected from 16 stations in the Var catchment,six different interpolation approaches including:inverse distance weight(IDW),spline,kriging with linear and spherical semi-variogram models and geographically weighted regression considering elevation effects and the combined impacts of elevation and distance to the sea were tested.Integrated the results of statistical and modeling assessments,the 400m resolution distributed rainfall generated by IDW algorithm shows high preference in generating distributed rainfall in the Var catchment.Moreover,the strategy described in the article also shows promising acceptability for other catchments.展开更多
The growing complexity of the competition among uses and the emerging understanding of the synergy effects within the catchments and the rivers have underlined the need for information on various aspects of water:prec...The growing complexity of the competition among uses and the emerging understanding of the synergy effects within the catchments and the rivers have underlined the need for information on various aspects of water:precipitations,discharges,velocities,and water depths are some of the basic characteristics that need to be studied for developing a management strategy that can identify and balance the various uses,ensure conservation of resources,and mitigate the potential effect of extreme events.At present,technical innovation provides the possibility to perform measurements on thefield,to produce the needed information,and to move to a new paradigm for the management of rivers.This study analyzes the concept of smart river management that emerged recently with the wide spread of Information Technologies(IT)solutions and develop-ment of a new generation of sensors based on internet of things architecture.The analysis demonstrates that a holistic approach is needed for efficient management of rivers.The use of Information and Communication Technologies solutions can provide a real added value,but important efforts must be engaged for identifying key activities in the various domains that can benefit from the digital transformation.At the same time,this study introduces the paradigm of a river information system that encompasses the various activities taking place around the rivers and ensures gradual integration of the various IT components in a consistent environment that provides support to the many users of rivers.To achieve this objective,the current situation requires formalization of a roadmap and the need to address the various activities in a systematic way.Within this long-term process,the digital twins concept represents a step toward the target water information system and has generated interest among professional communities.展开更多
Although the recent concept of Integrated Water Resources Management(IWRM)is continuously searching for modern operational approaches to be implemented in practice,the Decision Support Systems(DSSs)have been considere...Although the recent concept of Integrated Water Resources Management(IWRM)is continuously searching for modern operational approaches to be implemented in practice,the Decision Support Systems(DSSs)have been considered a major effective tool for supporting IWRM.According to the weaknesses and limitations in the current DSSs,this paper presents a new DSS development strategy based on an architecture design including higher levels of competitive advantages in system flexibility,product maintenance,and user acceptance.Instead of producing a DSS as a stand-alone product limited to realtime monitoring,the selected approach presents a design for a real-time DSS service setup with a multilayered user interface and a multimodular modeling system.The methodology has been used and implemented over the Var catchment(2800 km^(2))and has been validated with an operational application.The designed DSS is currently used by the local management authorities with a high level of user satisfaction with monitoring and forecast services.The obtained result underlines the promising applicability of the proposed approach for other DSSs addressing utilities.展开更多
文摘In this paper,we present a novel first-order digitalΣΔconverter tailored for digital-to-analog applications,focusing on achieving both high yield and reduced silicon estate.Our approach incorporates a substantial level of dithering noise into the input signal,strategically aimed at mitigating the spurious frequencies commonly encountered in such converters.Validation of our design is performed through simulations using a high-level simulator specialized in mixed-signal circuit analysis.The results underscore the enhanced performance of our circuit,especially in reducing spurious frequencies,highlighting its efficiency and effectiveness.The final circuit exhibits an effective number of bits of 13.
基金National Key Research and Development Program of China,Grant/Award Number:2023YFC3006702。
文摘To have effective water resource management,the distributed hydrological models are commonly applied for supporting the decision-making processes.Among different inputs,the spatial distributed rainfall plays significant role in those model simulations.Many interpolation methods have been developed for generating distributed rainfall based on measurement samples.However,depending on the catchment characteristics and data availability,the suitable interpolation algorithm is case-dependent.This paper presents one operational approach for determining the resonable interpolation algorithm in a complex large catchment(Var catchment,France).Based on the daily rainfall data(2008–2014)collected from 16 stations in the Var catchment,six different interpolation approaches including:inverse distance weight(IDW),spline,kriging with linear and spherical semi-variogram models and geographically weighted regression considering elevation effects and the combined impacts of elevation and distance to the sea were tested.Integrated the results of statistical and modeling assessments,the 400m resolution distributed rainfall generated by IDW algorithm shows high preference in generating distributed rainfall in the Var catchment.Moreover,the strategy described in the article also shows promising acceptability for other catchments.
基金China Institute of Water Resources and Hydropower Research,Grant/Award Number:WH0145B062022。
文摘The growing complexity of the competition among uses and the emerging understanding of the synergy effects within the catchments and the rivers have underlined the need for information on various aspects of water:precipitations,discharges,velocities,and water depths are some of the basic characteristics that need to be studied for developing a management strategy that can identify and balance the various uses,ensure conservation of resources,and mitigate the potential effect of extreme events.At present,technical innovation provides the possibility to perform measurements on thefield,to produce the needed information,and to move to a new paradigm for the management of rivers.This study analyzes the concept of smart river management that emerged recently with the wide spread of Information Technologies(IT)solutions and develop-ment of a new generation of sensors based on internet of things architecture.The analysis demonstrates that a holistic approach is needed for efficient management of rivers.The use of Information and Communication Technologies solutions can provide a real added value,but important efforts must be engaged for identifying key activities in the various domains that can benefit from the digital transformation.At the same time,this study introduces the paradigm of a river information system that encompasses the various activities taking place around the rivers and ensures gradual integration of the various IT components in a consistent environment that provides support to the many users of rivers.To achieve this objective,the current situation requires formalization of a roadmap and the need to address the various activities in a systematic way.Within this long-term process,the digital twins concept represents a step toward the target water information system and has generated interest among professional communities.
基金The work benefited from the data provided by the Metropole Nice Côte d'Azur,Conseil Départemental des Alpes-Maritimes,Meteo France,and H2EAPart of this research is funded by the National Key Research Program(2019YFC1510603)the“Five talents”Plan of the China Insititute of Water Resource and Hydropower Research(WH0145B062022).
文摘Although the recent concept of Integrated Water Resources Management(IWRM)is continuously searching for modern operational approaches to be implemented in practice,the Decision Support Systems(DSSs)have been considered a major effective tool for supporting IWRM.According to the weaknesses and limitations in the current DSSs,this paper presents a new DSS development strategy based on an architecture design including higher levels of competitive advantages in system flexibility,product maintenance,and user acceptance.Instead of producing a DSS as a stand-alone product limited to realtime monitoring,the selected approach presents a design for a real-time DSS service setup with a multilayered user interface and a multimodular modeling system.The methodology has been used and implemented over the Var catchment(2800 km^(2))and has been validated with an operational application.The designed DSS is currently used by the local management authorities with a high level of user satisfaction with monitoring and forecast services.The obtained result underlines the promising applicability of the proposed approach for other DSSs addressing utilities.
