检索结果-南通市图书馆

Chinese Journal of Chemical Engineering 2023年第4期56卷 46-57页

作者： Haoshan Duan xi meng Jian Tang Junfei Qiao Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Beijing Laboratory of Smart Environmental Protection Beijing 100124China Beijing Key Laboratory of Computational Intelligence and Intelligent System Beijing 100124China Engineering Research Center of Intelligence Perception and Autonomous Control Ministry of Education Beijing 100124China

Air pollution control poses a major problem in the implementation of municipal solid waste incineration(MSWI).Accurate prediction of nitrogen oxides(NO_(x))concentration plays an important role in efficient NO_(x)emission *** this study,a modular long short-term memory(M-LSTM)network is developed to design an efficient prediction model for NO_(x)***,the fuzzy C means(FCM)algorithm is utilized to divide the task into several sub-tasks,aiming to realize the divide-and-conquer ability for complex ***,long short-term memory(LSTM)neural networks are applied to tackle corresponding sub-tasks,which can improve the prediction accuracy of the ***,a cooperative decision strategy is designed to guarantee the generalization performance during the testing or application ***,after being evaluated by a benchmark simulation,the proposed method is applied to a real MSWI *** the experimental results demonstrate the considerable prediction ability of the M-LSTM network.

关键词： Municipal solid waste incineration NO_(x)concentration prediction Modular neural network Model

Exact (3+1)-Dimensional, 2-Soliton Solutions to the Einstein Gravitational Field Equation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1997年第7期14卷 492-494页

作者： AU Chi TANG meng-xi Department of Applied Mathemetics Hong Kong Polytechnic UniversityHong Kong Department of Physics Zhongshan UniversityGuangzhou 510275

A set of exact(3+1)-dimensional cylindrically symmetric 2-soliton solutions with three arbitrary functions to the Einstein gravitational field equation is *** physical properties,such as nontriviality,propagation and ... 详细信息

关键词： Einstein nontrivial soliton

Event-triggered-based self-organizing fuzzy neural network control for the municipal solid waste incineration process

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2023年第4期66卷 1096-1109页

作者： HE HaiJun meng xi TANG Jian QIAO JunFei Faculty of Information Technology Beijing University of TechnologyBejing 100124China Beijing Laboratory of Smart Environmental Protection Beijing 100124China Beijing Key Laboratory of Computational Intelligence and Intelligent System Bejing 100124China Engineering Research Center of Intelligence Perception and Autonomous Control Ministry of Education Bejing 100124China xi'an Institute of Electromechanical Information Technology Xi'an 710065China

Due to the large uncertainty in the municipal solid waste incineration(MSWI)process,the furnace temperature of the MSWI process is difficult to control and the controller is updated *** improve the accuracy and reduce the number of controller updates,a novel event-triggered control method based correntropy self-organizing TS fuzzy neural network(ETCSTSFNN)is ***,the neurons of the rule layer are grown or pruned adaptively based on activation intensity and control error to meet the dynamic change of the actual operating ***,the performance index is designed based on the correntropy of tracking errors,and the parameters of the controller are adjusted by gradient descent ***,a fixed threshold event-triggered condition is designed to determine whether the current controller is updated or *** stability of the control system is proved based on the Lyapunov stability ***,the furnace temperature control experiments are conducted based on the actual data of a municipal solid waste incineration plant in *** experimental results show that the proposed ET-CSTSFNN controller shows a better control performance,which can reduce the number of the controller update significantly while achieving accurate furnace temperature control compared with other traditional control methods.

关键词： municipal solid waste incineration furnace temperature fuzzy control event-triggered

Electrogravitational Resonance of a Gaussian Beam to a High-Frequency Relic Gravitational Wave

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2001年第12期18卷 1546-1549页

作者： LI Fang-Yu TANG meng-xi Department of Physics Chongqing UniversityChongqing 400044 Department of Physics Zhongshan UniversityGuangzhou 510275

We consider the resonant response of a Gaussian beam passing through a static magnetic field to a high-frequency relic gravitational wave (GW). It is found that under the synchroresonance condition, the first-order perturbative electromagnetic energy fluxes will contain a "left circular wave" and a "right circular wave" around the symmetrical axis of the Gaussian beam, but the perturbative effects produced by the + and × polarization of the GW have a different physical behaviour. For the high-frequency relic GW with vg=10^(10) Hz, h=10^(-30), recently expected by the quintessential inflationary models, the corresponding perturbative photon flux passing through the region 10^(-2)m^(2) would be expected to be 104 s^(-1). This is the largest perturbative photon flux we have recently analysed and estimated using the typical laboratory parameters.

关键词： parameters circular Gaussian

Electrodynamical Response to a High Frequency Standing Gravitational Wave

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1998年第3期15卷 159-161页

作者： LI Fang-yu TANG meng-xi Department of Physics Chongqing UniversityChongqing 630044 Department of Physics Zhongshan UniversityGuangzhou 510275

Electrodynamical response(ER)to the high frequency standing gravitational wave(GW)of a composite toroidal electromagnetic resonant system is investigated,corresponding perturbation solutions are given,the advantages and shortcomings of electromagnetic detection to the standing GW by means of a static magnetic field and superconducting resonant cavity are compared.A concrete numerical calculation shows that under the reasonable states of the present technology,the ER to the standing GW can probably be displayed at the level of the single photon avalanche effect.

关键词： effect dynamical resonant

Effects of rainfall regime and its character indices on soil loss at loessial hillslope with ephemeral gully

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Mountain Science 2017年第3期14卷 527-538页

作者： HAN Yong ZHENG Fen-li XU xi-meng State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau Institute of Soil and Water ConservationChinese Academy of SciencesYangling 712100China University of Chinese Academy of Sciences Beijing 100049China Institute of Soil and Water Conservation NorthwestA&F UniversityYangling 712100China

Understanding the relationship between hillslope soil loss with ephemeral gully and rainfall regime is important for soil loss prediction and erosion control. Based on 12-year field observation data, this paper quantified the rainfall regime impacts on soil loss at loessial hillslope with ephemeral gully. According to three rainfall parameters including precipitation （P）, rainfall duration （t）, and maximum 30-minute rainfall intensity （I30）, 115 rainfall events were classified by using K-mean clustering method and Discriminant Analysis. The results showed that 115 rainfall events could be divided into three rainfall regimes. Rainfall Regime 1 （RR1） had large I30 values with low precipitation and short duration, while the three rainfall parameters of Rainfall Regime 3 （RR3） were inversely different compared with those of RR1; for Rainfall Regime 2 （RR2）, the precipitation, duration and Iso values were all between those of RR1 and RR3. Compared with RR2 and RR3, RR1 was the dominant rainfall regime for causing soil loss at the loessial hillslope with ephemeral gully, especially for causing extreme soil loss events. PI30 （Product of P and Izo） was selected as the key index of rainfall characteristics to fit soil loss equations. Two sets of linear regression equations between soil loss and Plzo with and without rainfall regime classification were fitted. Compared with the equation without rainfall regime classification, the cross validation results of the equations with rainfall regime classification was satisfactory. These results indicated that rainfall regime classification could not only depict rainfall characteristics precisely, but also improve soil loss equation prediction accuracy at loessial hillslope with ephemeral gully.

关键词： Rainfall regime Soil loss Rainfall character indices Loessial hillslope Ephemeral gully

5G technology requirements and related test environments for evaluation

在线全文

学校读者我要写书评

暂无评论

China Communications 2016年第S2期13卷 42-51页

作者： xi meng Jian Li Dong Zhou Dacheng Yang Beijing University of Posts and Telecommunications ZTE Corporation

To meet the considerably increase of mobile data traffic and wireless communication connections around 2020,the 5th generation(5G)mobile network will necessarily consider more frequency bands,enabling technologies and diversified key performance indicators and test environments comparing with existing network,for example Long Term *** specifically,the obvious difference between 5G and previous wireless communication system are not only included eMBB(enhance mobile broadband) usage scenario,but also introduced mMTC(massive machine type communications)and URLLC(ultra-reliable and low latency communications) usage ***,in order to evaluate 5G related technologies,some novel test environments will be widely discussed,as well as,certain new key performance indicators will be drawn into5 G evaluation methodology for satisfied new *** will discuss characteristic of these 4 candidate test environments,such as indoor isolated environment,high speed train environment;and the definition of 15 keys performance indicator will be explained and clarified,for example,Throughput,Network Energy Efficiency,Device Connection Density and so ***,high-level assessment method of each test environment also will be initially *** is notable that an initial evaluation of indoor isolated environment also can be found,which the results show that there are 3 times average cell spectral efficiency than IMT-advanced's in same test environment.

关键词： 5G IMT-2020 test environment requirements key performance indicators

A digital twins enabled underwater intelligent internet vehicle path planning system via reinforcement learning and edge computing

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2024年第2期10卷 282-291页

作者： Jiachen Yang meng xi Jiabao Wen Yang Li Houbing Herbert Song School of Electrical and Information Engineering Tianjin UniversityTianjin300072China Security and Optimization for Networked Globe Laboratory(SONG Lab) Embry-Riddle Aeronautical UniversityDaytona BeachFL32114USA

The Autonomous Underwater Glider(AUG)is a kind of prevailing underwater intelligent internet vehicle and occupies a dominant position in industrial applications,in which path planning is an essential *** to the complexity and variability of the ocean,accurate environment modeling and flexible path planning algorithms are pivotal *** traditional models mainly utilize mathematical functions,which are not complete and *** existing path planning algorithms depend on the environment and lack *** overcome these challenges,we propose a path planning system for underwater intelligent internet *** applies digital twins and sensor data to map the real ocean environment to a virtual digital space,which provides a comprehensive and reliable environment for path *** design a value-based reinforcement learning path planning algorithm and explore the optimal network structure *** path simulation is controlled by a closed-loop model integrated into the terminal vehicle through edge *** integration of state input enriches the learning of neural networks and helps to improve generalization and *** task-related reward function promotes the rapid convergence of the *** experimental results prove that our reinforcement learning based path planning algorithm has great flexibility and can effectively adapt to a variety of different ocean conditions.

关键词： Digital twins Reinforcement learning Edge computing Underwater intelligent internet vehicle Path planning

Research on behavior recognition algorithm based on SE-I3D-GRU network

在线全文

学校读者我要写书评

暂无评论

High Technology Letters 2021年第2期27卷 163-172页

作者： Wu Jin Yang Xue xi meng Wan xianghong School of Electronic and Engineering Xi'an University of Posts and TelecommunicationsXi'an 710121P.R.China

In order to effectively solve the problems of low accuracy and large amount of calculation of current human behavior recognition,a behavior recognition algorithm based on squeeze-and-excitation network(SENet) combined with 3 D Inception network(I3 D) and gated recurrent unit(GRU) network is *** algorithm first expands the Inception module to three-dimensional,and builds a network based on the three-dimensional module,and expands SENet to three-dimensional,making it an attention mechanism that can pay attention to the three-dimensional *** SENet is introduced into the 13 D network,named SE-I3 D,and SENet is introduced into the CRU network,named ***,SE-13 D and SE-GRU are merged,named SE-13 ***,the network uses Softmax to classify the results in the UCF-101 *** experimental results show that the SE-I3 D-GRU network achieves a recognition rate of 93.2% on the UCF-101 dataset.

关键词： behavior recognition,squeeze-and-excitation network(SENet) Incepton network gated recurrent unit(GRU)

Thickness measurement approach for plasma sprayed coatings using ultrasonic testing technique

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2004年第z1期14卷 88-91页

作者： LIN Li LI xi-meng XU Zhi-hui LEI Ming-kai NDT&E Laboratory NDT&E Laboratory NDT&E Laboratory Surface Engineering Laboratory Dalian University of Technology Dalian 116024 China

The special ultrasonic testing system has been developed for thickness measurement of plasma sprayed coatings. The ultrasonic immersion method was used to obtain stable coupling condition and avoid other disadvantages of contact method. Spherical acoustic lens were designed to focus ultrasonic beam so as to improve beam directivity and concentrate ultrasonic energy. To increase testing precision and avoid mussy wave signals, moderate pulse width and frequency of the transducer has been selected. The displacement of transducer in X-Y-Z directions was precisely manipulated by step-controlled system to insure the accuracy of focus length and repetition of measurement. Optimized testing conditions (with the transducer of center frequency of 10 MHz and crystal diameter of 8 mm, focus length of 9.5 mm, diameter of focal column of 0. 1 mm and length of focal column of 0.27 mm) were selected to determine the thickness between 285 -414 μm of ZrO2 coatings plasma sprayed on the nickel based superalloy. The frequency interval of the periodic extremums in ultrasonic power spectra decreases with increasing coating thickness. The ultrasonic results accord with those of metallographical method.

关键词： plasma sprayed coatings thickness measurement ultrasonic testing interference