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Relationship between ecological stoichiometry and plant community diversity in the upper reaches of Tarim River,northwestern China

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Journal of Arid Land 2020年第2期12卷 227-238页

作者： ZHAO Jingjing gong Lu chen xin College of Resources and Environment Science Xinjiang UniversityUrumqi 830046China Key Laboratory of Oasis Ecology Xinjiang UniversityUrumqi 830046China

Changes in ecological stoichiometry reflect nitrogen(N),phosphorus(P)and both N and P limitations in a plant community,which in turn affect plant diversity of the ***,the relationship between plant community diversity and ecological stoichiometry has not yet been fully researched in arid and semi-arid *** stoichiometry and plant community diversity indices of eighteen communities in the upper reaches of Tarim River,northwestern China,were analyzed by multivariate analysis of variance in *** correlation between ecological stoichiometry and plant community diversity was assessed by redundancy analysis(RDA).Results indicated that the Margalef index was significantly correlated with carbon(C)and P concentrations,the Simpson index and Shannon-Weaner index were significantly correlated with plant C concentration,and the Pielou index was significantly correlated with plant C and N ***,C:N and C:P ratios had significant impacts on plant community *** results highlight the importance of ecological stoichiometry in driving plant community diversity in the upper reaches of Tarim River,northwestern China.

关键词： Margalef index Simpson index Shannon-Weaner index redundancy analysis Tarim River

Strength Model of Soda Residue Soil Considering Consolidation Stress and Structural Influence

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Journal of Ocean University of China 2023年第5期22卷 1216-1226页

作者： gong xiaolong WANG Yuanzhan chen Tong State Key Laboratory of Hydraulic Engineering Simulation and Safety and Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Tianjin UniversityTianjin 300354China Tianjin Port(Group)Co.Ltd. Tianjin 300461China Zhongnan Engineering Co.Ltd. Changsha 410014China

Soda residue(SR)is a type of industrial waste produced in the soda process with the ammonia-soda *** SR to backfilling solves the land occupation and environmental pollution problems in coastal areas and saves material costs for foundation *** strength characteristics of soda residue soil(SRS)under different consolidation conditions are the key points to be solved in the engineering application of *** compression tests were performed on the undisturbed SRS of Tianjin *** shear properties of SRS under different consolidation conditions were then ***,a structural strength model(SSM)based on Mohr-Coulomb theory was *** reflects the influence of soil structure on undrained strength(Cu)and divides the Cu into the following two parts:friction strength(C_(uf))and original structural strength(C_(u0)).C_(uf)characterizes the magnitude of friction between soil particles,which is related to the consolidation ***,C_(u0)represents the structural effect on soil strength,which is related to the soil deposition and consolidation *** was validated by the test data of undisturbed *** reveal that the undisturbed soil generally had a certain C_(u0).Therefore,the SRS strength model was established by combining the experimental law of SRS with *** analysis shows that the SRS strength model can effectively predict the Cu of undisturbed SRS in Tianjin Port under different consolidation conditions.

关键词： soda residue soil triaxial test strength model soil structure consolidation stress

Integrated knowledge-based modeling and its application for classification problems

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Journal of Systems Engineering and Electronics 2008年第6期19卷 1277-1282页

作者： chen Tieming gong Rongsheng Huang Samuel H Coll. of Software Engineering Zhejiang Univ. of Technology Hangzhou 310032 P. R. China State Key Lab of Software Development Environment Beijing Univ. of Aeronautics and Astronautics Beijing 100083 P. R. China Intelligent Systems Lab Univ. of Cincinnati Cincinnati OH 45221 USA

Knowledge discovery from data directly can hardly avoid the fact that it is biased towards the collected experimental data, whereas, expert systems are always baffled with the manual knowledge acquisition bottleneck. So it is believable that integrating the knowledge embedded in data and those possessed by experts can lead to a superior modeling approach. Aiming at the classification problems, a novel integrated knowledge-based modeling methodology, oriented by experts and driven by data, is proposed. It starts from experts identifying modeling parameters, and then the input space is partitioned followed by fuzzification. Afterwards, single rules are generated and then aggregated to form a rule base, on which a fuzzy inference mechanism is proposed. The experts are allowed to make necessary changes on the rule base to improve the model accuracy. A real-world application, welding fault diagnosis, is presented to demonstrate the effectiveness of the methodology.

关键词： knowledge discovery fuzzy rule discretization rule generation fuzzy inference

数字经济背景下高校大数据与会计专业课程思政建设研究

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湖北科技学院学报 2025年第1期45卷 110-115页

作者：陈晓娟龚斌安咸宁职业技术学院湖北咸宁437100

在数字经济背景下,企业正面临着数字化转型,大数据与会计专业课程思政建设也需与时俱进。伴随新质生产力的发展,企业对财会人才的需求逐渐由核算向管理型转变,企业对财会人才的综合素养,也提出了更高的要求。本文将针对目前高校大数据... 详细信息

在数字经济背景下,企业正面临着数字化转型,大数据与会计专业课程思政建设也需与时俱进。伴随新质生产力的发展,企业对财会人才的需求逐渐由核算向管理型转变,企业对财会人才的综合素养,也提出了更高的要求。本文将针对目前高校大数据与会计专业课程思政建设中存在的对课程思政的认识与重视不够、思政元素挖掘与建设不深、思政元素融入与实践性不强等问题,提出以立德树人为根本任务,构建“一模式、三聚焦、三协同”的“一三三”思政育人体系,并探讨对应的建设保障机制,以期更好地推进数字经济背景下大数据与会计专业课程思政建设与发展。

关键词：数字经济大数据与会计课程思政

Damping of Magnetorheological Elastomers

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Chinese Journal of Chemical Physics 2008年第6期21卷 581-585页

作者： Lin chen xing-long gong Wei-hua Li CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Me- chanics University of Science and Technology of China Hefei 230027 China School of Mechanical Materials and Mechatronic Engineering University of Wollongong Wollongong NSW 2522 Australia

The damping property of magnetorheological （MR） elastomers is characterized by a modified dynamic mechanical-magnetic coupled analyzer. The influences of the external magnetic flux density, damping of the matrix, content of iron particles, dynamic strain, and driving frequency on the damping properties of MR elastomers were investigated experimentally. The experimental results indicate that the damping properties of MR elastomers greatly depend on the interfacial slipping between the inner particles and the matrix. Different from general composite materials, the interracial slipping in MR elastomers is affected by the external applied magnetic field.

关键词： Magnetorheological elastomers Damping property Interfacial slipping

Switching control of morphing aircraft based on Q-learning

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Chinese Journal of Aeronautics 2020年第2期33卷 672-687页

作者： Ligang gong Qing WANG Changhua HU chen LIU School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083China Science and Technology on Space Intelligent Control Laboratory Beijing Institute of Control EngineeringBeijing 100190China xi’an Institute of High Technology Xi’an 710025China School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China Beijing Institute of Electric System Engineering Beijing 100854China

This paper investigates a switching control strategy for the altitude motion of a morphing aircraft with variable sweep wings based on *** morphing process is regarded as a function of the system states and a related altitude motion model is ***,the designed controller is divided into the outer part and inner part,where the outer part is devised by a combination of the back-stepping method and command filter technique so that the’explosion of complexity’problem is ***,the integrator structure of the altitude motion model is exploited to simplify the back-stepping design,and disturbance observers inspired from the idea of extended state observer are devised to obtain estimations of the system *** control input switches from the outer part to the inner part when the altitude tracking error converges to a small value and linear approximation of the altitude motion model is *** inner part is generated by the Q-learning algorithm which learns the optimal command in the presence of unknown system matrices and *** is proved rigorously that all signals of the closed-loop system stay bounded by the developed control method and controller switching occurs only ***,comparative simulations are conducted to validate improved control performance of the proposed scheme.

关键词： Back-stepping Command filter Disturbance observer Morphing aircraft Q-learning Switching control

Secure Two-Party Distance Computation Protocol Based on Privacy Homomorphism and Scalar Product in Wireless Sensor Networks

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Tsinghua Science and Technology 2016年第4期21卷 385-396页

作者： Haiping Huang Tianhe gong Ping chen Reza Malekian Tao chen Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Department of Electrical Electronic and Computer EngineeringUniversity of Pretoria

Numerous privacy-preserving issues have emerged along with the fast development of the Internet of Things. In addressing privacy protection problems in Wireless Sensor Networks （WSN）, secure multi-party computation is considered vital, where obtaining the Euclidian distance between two nodes with no disclosure of either side＇s secrets has become the focus of location-privacy-related applications. This paper proposes a novel Privacy-Preserving Scalar Product Protocol （PPSPP） for wireless sensor networks. Based on PPSPP, we then propose a Homomorphic-Encryption-based Euclidean Distance Protocol （HEEDP） without third parties. This protocol can achieve secure distance computation between two sensor nodes. Correctness proofs of PPSPP and HEEDP are provided, followed by security validation and analysis. Performance evaluations via comparisons among similar protocols demonstrate that HEEDP is superior; it is most efficient in terms of both communication and computation on a wide range of data types, especially in wireless sensor networks.

关键词： secure two-party computation privacy-preserving wireless sensor networks scalar product distancecalculation privacy homomorphism

Building,Integrating,and Sharing Our Aging Society:Improving Older Adults’Health Together

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China CDC weekly 2021年第40期3卷 835-836页

作者： gong chen Peking University Institute of Population Research Peking University Institute of Ageing Study

This year marks the 20th anniversary of China becoming an aging society and the follow-up year of the 30th International Year of Older *** key policy of active response to population aging has been elevated to a national strategy(1).Thus,now is an important time for China CDC Weekly to publish a series of studies on health status and ways to improve the health of older Chinese adults.

关键词： Together policy becoming

Comprehensive Investigation of Submarine Slide Zones and Mass Movements at the Northern Continental Slope of South China Sea

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Journal of Ocean University of China 2018年第1期17卷 101-117页

作者： chen Hongjun LIANG Jin gong Yuehua Key Laboratory of Marine Mineral Resources Ministry of Land and ResourcesGuangzhou Marine Geological Survey

Multi-beam bathymetry and seismic sequence surveys in the northern slope of the South China Sea reveal detailed geomorphology and seismic stratigraphy characteristics of canyons, gullies, and mass movements. Modern canyons and gullies are roughly elongated NNW–SSW with U-shaped cross sections at water depths of 400–1000 m. Mass movements include slide complexes, slide scars, and debris/turbidity flows. Slide complexes and slide scars are oriented in the NE–SW direction and cover an area of about 1790 and 926 km^2, respectively. The debris/turbidity flows developed along the lower slope. A detailed facies analysis suggests that four seismic facies exist, and the late Cenozoic stratigraphy above the acoustic basement can be roughly subdivided into three sequences separated by regional unconformities in the study area. The occurrence of gas hydrates is marked by seismic velocity anomalies, bottom-simulating reflectors, gas chimneys, and pockmarks in the study area. Seismic observations suggest that modern canyons and mass movements formed around the transition between the last glacial period and the current interglacial period. The possible existence and dissociation of gas hydrates and the regional tectonic setting may trigger instability and mass movements on the seafloor. Canyons may be the final result of gas hydrate dissociation. Our study aims to contribute new information that is applicable to engineering construction required for deep-water petroleum exploration and gas hydrate surveys along any marginal sea.

关键词： South China Sea submarine slide zones mass movements continental slope