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Integrated system of traditional THz time-domain spectroscopy and asynchronous optical sampling
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作者 丁晶 孟庆昊 +4 位作者 沈妍 丁晨鑫 苏波 崔海林 张存林 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第4期742-746,共5页
Terahertz time-domain spectroscopy(THz-TDS)system,as a new means of spectral analysis and detection,plays an increasingly pivotal role in basic scientific research.However,owing to the long scanning time of the tradit... Terahertz time-domain spectroscopy(THz-TDS)system,as a new means of spectral analysis and detection,plays an increasingly pivotal role in basic scientific research.However,owing to the long scanning time of the traditional THz-TDS system and the complex control of the asynchronous optical scanning(ASOPS)system,which requires frequent calibration,we combine traditional THz-TDS and ASOPS systems to form a composite system and propose an all-fiber trigger signal generation method based on the time overlapping interference signal generated by the collinear motion of two laser pulses.Finally,the time-domain and frequency-domain spectra are obtained by using two independent systems in the integrated systems.It is found that the full width at half maximum(FWHM)of the time-domain spectra and the spectral width of the frequency-domain spectra are almost the same,but the sampling speed of the ASOPS system is significantly faster than that of the traditional THz-TDS system,which conduces to the study of the transient characteristics of substances. 展开更多
关键词 terahertz time-domain spectroscopy(THz-TDS) asynchronous optical scanning(ASOPS)system integrated system trigger signal
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Development of an Integrated System to Enhance Spatial Data Processing & Management for Planning Authorities
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作者 Clayton Lumwaya Jackson Phiri 《Journal of Geoscience and Environment Protection》 2023年第3期17-29,共13页
In a world where there is constant data generation and processing, the need for an integrated system cannot be overemphasized. The systems that enable storage of large amounts of spatial data and must be made availabl... In a world where there is constant data generation and processing, the need for an integrated system cannot be overemphasized. The systems that enable storage of large amounts of spatial data and must be made available to multiple users in real time. Studies have shown that standalone desktop spatial systems are often rigid and inflexible to support multiple data processing or demands from multiple users. The integrated spatial management system was designed to address the above highlighted challenges by bringing enhanced possibilities of utilization of spatial data though improving accessibility, visualization, and processing spatial information. The present work employed a mixed approach of qualitative and quantitative techniques to obtain the desired result. Qualitative data collection tools were used to collect field data required to design the prototype. The research sought to establish whether the integrated systems are in use by the targeted institutions, the findings highlighted that 71.4% have no integrated spatial data systems while 28.6% have partial-integrated systems. An overview of the architecture of integrated spatial systems consists of a well distributed database linked to multiple tools and platforms to query both the spatial and non-spatial data. The WEB-GIS and Mobile GIS interfaces were developed to allow multiple users to access information through the web in real time and data collection, respectively. 展开更多
关键词 integrated Information Management system Geographical Information system Planning Authority
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Multidisciplinary Design Optimization of A Human Occupied Vehicle Based on Bi-Level Integrated System Collaborative Optimization 被引量:4
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作者 赵敏 崔维成 李翔 《China Ocean Engineering》 SCIE EI CSCD 2015年第4期599-610,共12页
The design of Human Occupied Vehicle (HOV) is a typical multidisciplinary problem, but heavily dependent on the experience of naval architects at present engineering design. In order to relieve the experience depend... The design of Human Occupied Vehicle (HOV) is a typical multidisciplinary problem, but heavily dependent on the experience of naval architects at present engineering design. In order to relieve the experience dependence and improve the design, a new Multidisciplinary Design Optimization (MDO) method "Bi-Level Integrated System Collaborative Optimization (BLISCO)" is applied to the conceptual design of an HOV, which consists of hull module, resistance module, energy module, structure module, weight module, and the stability module. This design problem is defined by 21 design variables and 23 constraints, and its objective is to maximize the ratio of payload to weight. The results show that the general performance of the HOV can be greatly improved by BLISCO. 展开更多
关键词 Multidisciplinary Design Optimization (MDO) Human Occupied Vehicle (HOD Bi-Level integrated systemCollaborative Optimization (BLISCO) general performance
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Hybrid Kalman and unscented Kalman filters for INS/GPS integrated system considering constant lever arm effect 被引量:1
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作者 常国宾 柳明 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第2期575-583,共9页
In inertial navigation system(INS) and global positioning system(GPS) integrated system, GPS antennas are usually not located at the same location as the inertial measurement unit(IMU) of the INS, so the lever arm eff... In inertial navigation system(INS) and global positioning system(GPS) integrated system, GPS antennas are usually not located at the same location as the inertial measurement unit(IMU) of the INS, so the lever arm effect exists, which makes the observation equation highly nonlinear. The INS/GPS integration with constant lever arm effect is studied. The position relation of IMU and GPS's antenna is represented in the earth centered earth fixed frame, while the velocity relation of these two systems is represented in local horizontal frame. Due to the small integration time interval of INS, i.e. 0.1 s in this work, the nonlinearity in the INS error equation is trivial, so the linear INS error model is constructed and addressed by Kalman filter's prediction step. On the other hand, the high nonlinearity in the observation equation due to lever arm effect is addressed by unscented Kalman filter's update step to attain higher accuracy and better applicability. Simulation is designed and the performance of the hybrid filter is validated. 展开更多
关键词 inertial navigation system global positioning system(GPS) integrated system lever arm effect Kalman filter unscented Kalman filter
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Key technologies for the novel distributed numerical control integrated system 被引量:1
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作者 TAOGuibao LIUFei WANGShilong 《Journal of Chongqing University》 CAS 2004年第1期1-5,共5页
A novel distributed numerical control (DNC) integrated system based on plug-in software technology is proposed. It connects new or old numerical control (NC) machine tools which have inhomogeneous numerical control sy... A novel distributed numerical control (DNC) integrated system based on plug-in software technology is proposed. It connects new or old numerical control (NC) machine tools which have inhomogeneous numerical control systems with CAD/CAM system by CANbus network. A DNC computer is able to control 15 sets of NC machine tools reliably at the same time. The novel DNC system increases the efficiency of machine tools and improve the production management level by realizing non-paper production, agile manufacturing, networked manufacturing and so on in the near future. Key technologies to construct the novel DNC integrated system include the integration of inhomogeneous numerical control systems, NC program restart, and algorithm for communication competition. Such system has demonstrated successful applications in some corporations that have acquired good economic benefits and social effects. 展开更多
关键词 COMMUNICATION distributed numerical control CANBUS plug-in software program restart integrated system
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Development and Application of the GIS-Based Water Mass Analysis Integrated System
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作者 张月霞 苗振清 严世强 《Marine Science Bulletin》 CAS 2008年第2期26-35,共10页
The research on water masses is always one important facet of Oceanography. I adopt the method of Fuzzy Density Clustering to analyse water masses. Meanwhile, I use Visual Basic 6.0 as developing platform and utilize ... The research on water masses is always one important facet of Oceanography. I adopt the method of Fuzzy Density Clustering to analyse water masses. Meanwhile, I use Visual Basic 6.0 as developing platform and utilize the MapX components to develop the platform of GIS. By integrating the Water Masses Model compiled by FORTRAN language, and GIS using Tight Coupling, I develop an Integrated System. That makes all phases are finished in one condition, including the gain of computing grid, the pick-up and analysis of data, the choice of parameters and resetting, the computing of model, and the result's visualization. It improves the efficiency of the data analysis and decision-making Finally, this system is applied in the Zhoushan fishing ground and adjacent region. The results are satisfying. 展开更多
关键词 Water mass GIS Model integration the Zhoushan fishing ground
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The Integrated System of Aerial Photogrammetry and Tower Locations Optimization for Transmission Lines
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作者 Xie Yuan, Pan Yijun, Fu Bin Northwest Power Design Institute 《Electricity》 1996年第4期45-48,共4页
This paper describes the functions and the features of the integrated system of aerial survey and tower locations optimization for transmission lines, which includes all stages from data acquisition, data transmission... This paper describes the functions and the features of the integrated system of aerial survey and tower locations optimization for transmission lines, which includes all stages from data acquisition, data transmission and data processing to automatic optimization of the tower locations and drawing. The paper also briefly describes the economic benefit gained from this system, and finally proposes the directions of the future development for this system. 展开更多
关键词 PRO The integrated system of Aerial Photogrammetry and Tower Locations Optimization for Transmission Lines
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Integrated System of Solar Cells with Hierarchical NiCo2O4 Battery-Supercapacitor Hybrid Devices for Self-Driving Light-Emitting Diodes 被引量:5
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作者 Yuliang Yuan Yangdan Lu +10 位作者 BeiEr Jia Haichao Tang Lingxiang Chen YuJia Zeng Yang Hou Qinghua Zhang Qinggang He Lei Jiao Jianxing Leng Zhizhen Ye Jianguo Lu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2019年第3期92-103,共12页
An integrated system has been provided with a-Si/H solar cells as energy conversion device,NiCo2O4 battery-supercapacitor hybrid(BSH)as energy storage device,and light emitting diodes(LEDs)as energy utilization device... An integrated system has been provided with a-Si/H solar cells as energy conversion device,NiCo2O4 battery-supercapacitor hybrid(BSH)as energy storage device,and light emitting diodes(LEDs)as energy utilization device.By designing three-dimensional hierarchical NiCo2O4 arrays as faradic electrode,with capacitive electrode of active carbon(AC),BSHs were assembled with energy density of 16.6 Wh kg-1,power density of 7285 W kg-1,long-term stability with 100% retention after 15,000 cycles,and rather low self-discharge.The NiCo2O4//AC BSH was charged to 1.6 V in 1 s by solar cells and acted as reliable sources for powering LEDs.The integrated system is rational for operation,having an overall efficiency of 8.1% with storage efficiency of 74.24%.The integrated system demonstrates a stable solar power conversion,outstanding energy storage behavior,and reliable light emitting.Our study offers a precious strategy to design a self-driven integrated system for highly efficient energy utilization. 展开更多
关键词 integrated system NiCo2O4 Battery-supercapacitor hybrid devices SELF-DRIVING LED
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Intelligent Control and Maintenance Man-agement Integrated System Based on Multi-Agents for Coal-Preparation Plant 被引量:3
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作者 MENG Fan-qin WANG Yao-cai 《Journal of China University of Mining and Technology》 EI 2006年第2期206-210,共5页
This paper discusses the progress of computer integrated processing (CIPS) of coal-preparation and then preserits an intelligence controlled production-process, device-maintenance and production-management system of... This paper discusses the progress of computer integrated processing (CIPS) of coal-preparation and then preserits an intelligence controlled production-process, device-maintenance and production-management system of coal- preparation based on multi-agents (IICMMS-CP). The construction of the IICMMS-CP, the distributed network control system based on live intelligence control stations and the strategy of implementing distributed intelligence control system are studied in order to overcome the disadvantages brought about by the wide use of the PLC system by coaipreparation plants. The software frame, based on a Multi-Agent Intelligence Control and Maintenance Management integrated system, is studied and the implemention methods of IICMMS-CP are discussed. The characteristics of distributed architecture, cooperation and parallel computing meet the needs of integrated control of coal-preparation plants with large-scale spatial production distribution, densely-related processes and complex systems. Its application further improves the reliability and precision of process control, accuracy of fault identification and intelligence of production adjustment, establishes a technical basis for system integration and flexible production. The main function of the system has been tested in a coal-preparation plant to good effect in stabilizing product quality, improving efficiency and reducing consumption. 展开更多
关键词 intelligence controlled process multi-agent system computer integrated processing system coal preparation plant
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Adaptive Federal Kalman Filtering for SINS/GPS Integrated System 被引量:2
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作者 杨勇 缪玲娟 《Journal of Beijing Institute of Technology》 EI CAS 2003年第4期371-375,共5页
A new adaptive federal Kalman filter for a strapdown integrated navigation system/global positioning system (SINS/GPS) is given. The developed federal Kalman filter is based on the trace operation of parameters estima... A new adaptive federal Kalman filter for a strapdown integrated navigation system/global positioning system (SINS/GPS) is given. The developed federal Kalman filter is based on the trace operation of parameters estimation's error covariance matrix and the spectral radius of update measurement noise variance-covariance matrix for the proper choice of the filter weight and hence the filter gain factors. Theoretical analysis and results from simulation in which the SINS/GPS was compared to conventional Kalman filter are presented. Results show that the algorithm of this adaptive federal Kalman filter is simpler than that of the conventional one. Furthermore, it outperforms the conventional Kalman filter when the system is undertaken measurement malfunctions because of its possession of adaptive ability. This filter can be used in the vehicle integrated navigation system. 展开更多
关键词 SINS/GPS integrated navigation federal Kalman filtering adaptive filtering
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Integrated Systemfor Tube Bending Digital Manufacturing 被引量:2
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作者 吕波 唐承统 +1 位作者 宁汝新 宋月英 《Journal of Beijing Institute of Technology》 EI CAS 2006年第2期127-132,共6页
An integrated CAD/CAPP/CAM system of tube manufacturing based on integration frame is presented. In this system, two kinds of data conventions describing tube shape are presented in tube CAD subsystem, the object-orie... An integrated CAD/CAPP/CAM system of tube manufacturing based on integration frame is presented. In this system, two kinds of data conventions describing tube shape are presented in tube CAD subsystem, the object-oriented concept and the goal-driven inference mechanism have been applied in the development of the knowledge-based CAPP subsystem and simulation of tube processing under tube bending simulation subsystem is performed based on the tube model's piecewise representation. A tube product case is considered to give the application of the integrated system, and the advantages of the system in the use of tube bending are revealed. 展开更多
关键词 numerical control (NC) tube bending CAD/CAPP/CAM integration process decision bending simulation
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“An integrated system,three separated responsibilities”,a new fever clinic management model,in prevention and control of novel coronavirus pneumonia 被引量:2
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作者 Jian Shen Qiang He +8 位作者 Ting Shen Zhi-Qiang Wu Ming-Ming Tan Yu-Lan Chen Qin Weng Liang-Min Nie Hong-Fang Zhang Bin Zheng Jun Zhang 《World Journal of Clinical Cases》 SCIE 2021年第30期9050-9058,共9页
BACKGROUND Since December 2019,there have been many new cases of coronavirus pneumonia in Wuhan,Hubei Province,which has gradually spread throughout the country.AIM To explore our hospital’s innovative management sys... BACKGROUND Since December 2019,there have been many new cases of coronavirus pneumonia in Wuhan,Hubei Province,which has gradually spread throughout the country.AIM To explore our hospital’s innovative management system to ensure the efficient operation of fever clinics during the epidemic,since controlling the spread of disease is an important way to prevent and control the epidemic.METHODS In total,200 outpatients with fever at our hospital between November 2019 and July 2020 were selected and allocated into two groups.RESULTS The fever clinic in our hospital operated smoothly,and infection with the novel coronavirus disease(COVID-19)has not been reported in our hospital.Additionally,we did not have any cases of missed diagnosis.The awareness regarding COVID-19 infection sources,transmission routes,early symptoms,and preventive measures was significantly higher in our fever clinic than in those of the pre-management group.CONCLUSION"An integrated system,three separate responsibilities"ensured the efficient functioning of our fever outpatient clinic and early screening of COVID-19 cases,which effectively curbed the transmission of COVID-19 and hence prevented COVID-19 pneumonia epidemic in our hospital,ultimately achieving the maximum effect of epidemic prevention and control. 展开更多
关键词 Fever clinics Novel coronavirus Novel coronavirus pneumonia Integration of three responsibilities Epidemic prevention and control
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Computational Analysis of Performance for Heterogeneous Integrated System with Test Automation 被引量:1
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作者 K.Krishna Mohan A.Srividya Ravikumar Gedela 《International Journal of Automation and computing》 EI 2007年第4期353-358,共6页
Heterogeneity is inevitable in enterprises due to their various input requirements. The usage of proprietary integration products results in the increased cost of enterprises. During the integration, the focus area ha... Heterogeneity is inevitable in enterprises due to their various input requirements. The usage of proprietary integration products results in the increased cost of enterprises. During the integration, the focus area has been found to often address only the functional requirements, while the non-functional requirements are side-stepped during the initial stages of a project. Moreover, the use of proprietary integration products and non-standards-based integration platform has given rise to an inflexible integration infrastructure resulting in adaptability concerns. Web services-based integration, based on open standards, is deemed to be the only feasible solution in such cases. This paper explains the performance analysis of enterprise integration in heterogeneous environments for the distributed and the transactional applications. The analysis presented in this paper is seen as a step towards making intelligent decisions well in advance when choosing the integration mechanism/products to address the functional as well as the non-functional requirements considering the future integration needs. 展开更多
关键词 Enterprise application integration reliability performance web services point-to-point IBM/rational platform service oriented architecture.
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VITROS 5600 Integrated System全自动生化免疫分析仪故障2例 被引量:1
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作者 王浪潮 《医疗装备》 2018年第4期140-140,共1页
美国强生公司生产的Integrated System全自动生化免疫分析仪,是整合了干化学技术、微量湿生化技术、增强化学发光技术、标本外观检测技术和Intellicheck全程质量监控技术的检验设备^([1])。仪器采用多层膜干化学技术,通过测定干片颜... 美国强生公司生产的Integrated System全自动生化免疫分析仪,是整合了干化学技术、微量湿生化技术、增强化学发光技术、标本外观检测技术和Intellicheck全程质量监控技术的检验设备^([1])。仪器采用多层膜干化学技术,通过测定干片颜色变化确定化合物浓度,具有连续随机上样和急诊样本插入优先功能,具有灵敏度高、特异度强、无污染、操作简单、方便快捷等特点,能够满足临床准确。 展开更多
关键词 VITROS 5600 integrated system 全自动生化免疫分析仪 故障
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Supporting Product Family Design in a3D CAD/PDM Integrated System 被引量:1
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作者 ZHANG Fen CHEN Zhuo-ning YAN Xiao-guang BIN Hong-zan 《International Journal of Plant Engineering and Management》 2006年第1期8-16,共9页
This paper addresses some key issues in supporting product family design in a 3 D CAD/ PDM integrated system and introduces the techniques developed or adopted in building the integrated system. The general architectu... This paper addresses some key issues in supporting product family design in a 3 D CAD/ PDM integrated system and introduces the techniques developed or adopted in building the integrated system. The general architecture of a 3D CAD/PDM integrated system is organized as five tiers. Multi-agent technology is applied with a collaborative design environment. The rule-based product family architecture ( PFA ) and tabular layouts of article characteristics (TLAC) technique are applied to represent the knowledge for product families. They make the knowledge understandable, simplified and can be exchanged among heterogeneous information systems. A transparently concentric integrated mode is put forward to enable the heterogeneous processes to interact and communicate regardless of the language used to construct each process. With the mode, function calling and information exchanging among different processes are carried out via message translation/parse approach. Currently, the integrated system is implemented in the platform of Windows NT and 2000. 展开更多
关键词 product family design CAD/PDM integration transparently concentric integrated mode
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Research on Flexible GaInP/GaInAs/Ge/Bi2Te3/Sb2Te3 PV-TE Integrated Systems
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作者 GAO Peng CHEN Lilin +4 位作者 WU Bo ZHANG Qiming XUE Chao HOU Chengyi SUN Qiang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2019年第4期781-786,共6页
An optimal structure design of the lattice mismatched GaInP/GaInAs/Ge solar cell with high photoelectric conversion efficiency was proposed. Two-dimensional Bi2Te3/Sb2Te3 nanosheets were prepared by solvothermal synth... An optimal structure design of the lattice mismatched GaInP/GaInAs/Ge solar cell with high photoelectric conversion efficiency was proposed. Two-dimensional Bi2Te3/Sb2Te3 nanosheets were prepared by solvothermal synthesis method used as thermoelectric(TE) functional materials, which is further hybrid with high conductive reduced graphene oxide(rGO) and carbon nanotubes(CNTs). TE film was then fabricated based on above materials. The power factor of the n-type TE film is 19.31 μW/mK2, and the power factor of the p-type TE film is 97.40 μW/mK2. The flexible TE device was integrated with flexible solar cell. Compared with the single photovoltaic(PV) cell, the efficiency of the as-prepared flexible integrated device measured under the AM1.5 illumination is significantly improved. The efficiency of the two parallel tests is increased from 27.26% and 26.59%, to 29.11% and 28.92%, respectively. The increasing ratio reaches 6.7%-8.8%. 展开更多
关键词 GaInP/GaInAs/Ge FLEXIBLE THERMOELECTRIC integrated systems
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Research on CAD/CAE/MDO integrated system for nuclear valve products
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作者 赖明珠 戴野 张国印 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第4期26-30,共5页
In order to realize rapid response to performance-driven design for nuclear valve products, a rapid design platform is constructed by combining the structural features with the multi-characteristic optimization requir... In order to realize rapid response to performance-driven design for nuclear valve products, a rapid design platform is constructed by combining the structural features with the multi-characteristic optimization requirement, which integrates parametric design, multi-characteristic simulation, and multidisciplinary design optimization of nuclear power valves together. Through the integration of heterogeneous CAX/MDO software, such as UG, ANSYS and iSIGHT, the analytical efficiency is enhanced by coupling respective and unique advantage of various software systems, and the mutual coordination and information sharing are realized between the heterogeneous systems. The application example shows that the system is convenient operation that improves the automation in design and analysis on nuclear valves. The results can provide a practical and effective development method and technical reference of the integrated design system for valve products. 展开更多
关键词 NUCLEAR power VALVE MULTIDISCIPLINARY DESIGN optimization DESIGN integrated system
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Brain Localization and the Integrated Systems Hypothesis: Evidence from Broca’s Region
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作者 Gerald C. Imaezue 《Journal of Behavioral and Brain Science》 2017年第11期511-519,共9页
The human brain is a fascinatingly complex organ with specialized structures associated with distinct functions. Classical and recent studies on brain localization propose that Broca’s area underpin expressive langua... The human brain is a fascinatingly complex organ with specialized structures associated with distinct functions. Classical and recent studies on brain localization propose that Broca’s area underpin expressive language and this has been generalized to explain brain functional organization. However, recent neuroimaging studies have shown that the Broca’s area is an extended network that not only participate in its primary function-expressive language processing but in secondary functions-processing non-linguistic/nonverbal tasks as well. Also, there is hierarchical connectivity and interaction of Broca’s region and different brain areas in underlying related primary functions. For this review, I start with revisiting the classical description of brain localization. I then discuss the neuroanatomy of language production and the role of Broca’s region in language processing. I then highlight the participation of the Broca’s area in non-linguistic tasks and non-primary linguistic tasks. Ultimately, I propose a novel hypothesis called integrated systems hypothesis. The integrated systems hypothesis is useful for guiding research on the multimodal role of specific localized integrated systems of the brain especially the role of the Broca’s region in integrating linguistic and non-linguistic processing and how this facilitate language production. 展开更多
关键词 BRAIN LOCALIZATION Broca’s Area Broca’s REGION integrated system integrated systems HYPOTHESIS
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Gateway Selection in MANET Based Integrated System: A Survey
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作者 Ye Miao Zhili Sun Ning Wang 《ZTE Communications》 2015年第4期45-52,共8页
Taking advantage of spontaneous and infrastructure-less behavior, a mobile ad hoc network (MANET) can be integrated with various networks to extend communication for different types of network services. In the integ... Taking advantage of spontaneous and infrastructure-less behavior, a mobile ad hoc network (MANET) can be integrated with various networks to extend communication for different types of network services. In the integrated system, to provide inter-connection between different networks and prnvide data aggregation, the design of the-gateway is vital. In some integrated networks with muhiple gateways, proper gateway selection guarantees desirable QoS and optimization of network resource utilization. However, how to select gateway efficiently is still challenging in the integrated MANET systems with distributed behavior terminals and limited network resources. In this paper, we examine gateway selection problem from different aspects including information discovery behavior, selection criteria and decision-making entity. The benefits and drawbacks for each method are illustrated and compared. Based on the discussion, points of considerations are highlighted for future studies. 展开更多
关键词 gateway selection MANET integrated network routing algorithms QOS
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Water and nitrogen footprint assessment of integrated agronomic practice management in a summer maize cropping system
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作者 Ningning Yu Bingshuo Wang +3 位作者 Baizhao Ren Bin Zhao Peng Liu Jiwang Zhang 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2024年第10期3610-3621,共12页
The footprints of water and nitrogen(WF and NF)provide a comprehensive overview of the type and quantity of water consumption and reactive nitrogen(Nr)loss in crop production.In this study,a field experiment over two ... The footprints of water and nitrogen(WF and NF)provide a comprehensive overview of the type and quantity of water consumption and reactive nitrogen(Nr)loss in crop production.In this study,a field experiment over two years(2019 and 2020)compared three integrated agronomic practice management(IAPM)systems:An improved management system(T2),a high-yield production system(T3),and an integrated soil-crop management system(ISCM)using a local smallholder farmer’s practice system(T1)as control,to investigate the responses of WF,Nr losses,water use efficiency(WUE),and nitrogen use efficiency(NUE)to IAPM.The results showed that IAPM optimized water distribution and promoted water use by summer maize.The evapotranspiration over the whole maize growth period of IAPM increased,but yield increased more,leading to a significant increase in WUE.The WUE of the T2,T3,and ISCM treatments was significantly greater than in the T1 treatment,in 2019 and 2020respectively,by 19.8-21.5,31.8-40.6,and 34.4-44.6%.The lowest WF was found in the ISCM treatment,which was 31.0%lower than that of the T1 treatment.In addition,the ISCM treatment optimized soil total nitrogen(TN)distribution and significantly increased TN in the cultivated layer.Excessive nitrogen fertilizer was applied in treatment T3,producing the highest maize yield,and resulting in the highest Nr losses.In contrast,the ISCM treatment used a reduced nitrogen fertilizer rate,sacrificing grain yield partly,which reduced Nr losses and eventually led to a significant increase in nitrogen use efficiency and nitrogen recovery.The Nr level in the ISCM treatment was34.8%lower than in the T1 treatment while NUE was significantly higher than in the T1 treatment by 56.8-63.1%in2019 and 2020,respectively.Considering yield,WUE,NUE,WF,and NF together,ISCM should be used as a more sustainable and clean system for sustainable production of summer maize. 展开更多
关键词 integrated agronomic practice management water footprints nitrogen footprints water use efficiency nitrogen use efficiency yield
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