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Seasonal characteristics analysis and uncertainty measurement for wind speed time series

Energy engineering: Journal of the Association of Energy engineering 2020年第5期117卷 289-299页

作者： Deng, Xing Shao, Haijian Wang, Xia School of Computer Science Jiangsu University of Science and Technology Zhenjiang212003 China School of Automation Key Laboratory of Measurement and Control for CSE Ministry of Education Southeast University Nanjing210096 China School of Information Science and Technology Nantong University Nantong226019 China Department of Electrical and Computer Engineering National University of Singapore 117583 Singapore

Wind speed’s distribution nature such as uncertainty and randomness imposes a challenge in high accuracy forecasting. Based on the energy distribution about the extracted amplitude and associated frequency, the uncertainty measurement is processed through Rényi entropy analysis method with time-frequency nat-ure. Nonparametric statistical method is used to test the randomness of wind speed, more precisely, whether or not the wind speed time series is independent and iden-tically distribution (i.i.d) based on the output probability. Seasonal characteristics of wind speed are analyzed based on self-similarity in periodogram under scales range generated by wavelet transformation to reasonably divide the original dataset and effectively reflect the seasonal distribution characteristics. Experimental evaluation based on the dataset from National Renewable Energy Laboratory (NREL) is given to demonstrate the performance of the proposed approach. © 2020, Tech Science Press. All rights reserved.

关键词： Wind speed

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Energy consumption optimization of scraper conveyors adopting rolling friction: A technological revolution in China’s coal mining equipment

Journal of Industrial Safety

引用

Journal of Industrial Safety 2025年

作者： Lin Chen Guangtong Song Duanyi Wang Xiaofeng Zhang Jian Hao Shandong University of Science and Technology College of Economics and Management Qingdao China 266590 China Academy of Information and Communications Technology Beijing China 100083 Nanjing University of Information Science and Technology School of Business Nanjing China 210044 Shandong Rhino High Polymer Material Co. Ltd Jinan China 250031 Shandong University of Science and Technology College of Energy and Mining Engineering Qingdao China 266590 Shandong University of Science and Technology Mine Disaster Prevent Control Ministry Qingdao China 266590

As the core equipment of fully mechanized mining, the scraper conveyor performs the important task of coal transportation. However, the scraper conveyor often consumes excessive energy during its operation due to local friction, resulting in energy waste. To address this problem, an energy consumption model was constructed herein based on the operating characteristics of the scraper conveyor. Using the model, it was found that the operating energy consumption could be significantly reduced by lowering friction, providing a theoretical basis for the energy consumption optimization of scraper conveyors. To reduce friction, a new type of scraper conveyor using rolling design was developed, and corresponding friction resistance tests were conducted. Furthermore, to verify the effect of the new design on energy consumption, an in-depth analysis was performed on the scraper conveyor operating at the Shanneng Shuangxin Coal Mine. The results showed that: (1) By changing the contact mode between the scraper and the middle trough from sliding to rolling, the friction between them was significantly reduced by approximately 90%. (2) By replacing the frictional interaction between the scraper and the middle trough with rolling friction, the scraper conveyor energy consumption was effectively reduced. (3) Operational evaluation revealed a 9.6% reduction in the total average daily current consumed by the scraper conveyor. In this study, the parameters and local structure of the scraper conveyor were optimized. By replacing the sliding operation with the rolling operation, the goals of reducing the failure rate of the scrapers and extending their service life were achieved. This not only directly improves the economic efficiency, profitability and market competitiveness of coal mines, but also provides important guidance for the optimization and improvement of scraper conveyors. These advancements may bring a technological revolution to China's coal mining equipment.

关键词： Scraper Conveyor Friction Energy Consumption Model Sliding Rolling

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Changes of Nitrogen and Phosphorus Removal Pattern Causing by Alternating Aerobic/Anoxia from the Perspective of Microbial Characteristics

SSRN

引用

SSRN 2022年

作者： Yao, Kai Huang, Xiao Dong, Wenyi Wang, Fupeng Liu, Xueyong Yan, Yu Qu, Yanhui Fu, Yicheng Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control School of Environmental Science and Engineering Nanjing University of Information Science & Technology Nanjing210044 China Shenzhen518055 China Northeast China Municipal Engineering Design and Research Institute Co Ltd Jilin130021 China Urban and Rural Water Environment Technology R&D Center China Communications Construction Co Ltd Jilin130021 China China Urban and Rural Holdings Group Co Ltd Beijing100029 China State Key Laboratory of Simulation and Regulation of River Basin Water Cycle China Institute of Water Resources and Hydropower Research Beijing100038 China

To investigate the effect of alternating aerobic/anoxic (A/O) on pollutant removal performance and microbial community structure, three sequencing batch reactors (SBR) processes with different alternating A/O times were set up. The results showed that alternating A/O was beneficial for organic matter degradation and promote nitrogen (N) and phosphorus (P) removal performance, and the removal efficiencies of chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), total nitrogen (TN), and total phosphorus (TP) increased 3.41%, 4.76%, 3.51%, and 6.27%, respectively. Besides, alternating A/O affected the dominant microbial community relative abundance (Proteobacteria and Bacteroidetes) and increased microbial richness and diversity. It also increased the relative abundance of aerobic denitrifying, heterotrophic nitrifying, and denitrifying phosphorus removal bacteria to change N and P removal patterns. Furthermore, the abundance of carbohydrate metabolism and amino acid metabolism were improved by alternating A/O to improve organic matter and TN removal. © 2022, The Authors. All rights reserved.

关键词： Chemical oxygen demand

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Experimental study on unfrozen water content of tailings based on nuclear magnetic resonance

引用

Journal of Applied Geophysics 2025年 241卷

作者： Yang, Yonghao Luo, Zhihao Tan, Ling Niu, Xia Long, Kun Zhu, Jiani National and Local Joint LaboratoryofTrafic Civil Engineering Materials Chongqing Jiaotong University Chongqing400074 China School of Civil Engineering Chongqing Jiaotong University Chongqing400074 China China Merchants Chongqing Communications Technology Research Design Institute Co. Ltd Chongqing400067 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing400030 China

Unfrozen water content (UWC) is an important index for evaluating the characteristics of water migration in frozen, but testing UWC is challenging in the scientific research of frozen soils. In this study, nuclear magnetic resonance was used to test the UWC of tailings. The effects of temperature, dry density, and initial water content on the type and content of unfrozen water were studied. A significance analysis was conducted between the UWC of the tailings and soil properties (dry density and initial water content) at different temperatures. Based on the parameter characteristics of the Michalowski model, the UWC prediction model is improved. The results show that the freezing of pore water begins with gravity water, and thawing begins with absorbed water. The UWC of frozen tailings increased as dry density and initial water content increased at a constant temperature. However, initial water content had a greater influence on UWC than dry density, particularly during the thawing process. The improved one-parameter Michalowski model provides a reliable prediction of UWC while reducing the complexity of the model. © 2025 Elsevier B.V.

关键词： Water content

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Research on FN-based MCVideo service for railway communication system 1

引用

4th International Conference on Electrical and Information Technologies for Rail Transportation, EITRT 2019

作者： Wang, Qingqing Li, Mingchun Sun, Bin Ding, Jianwen Zhong, Zhangdui State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing100044 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China Beijing Engineering Research Center of High-Speed Railway Broadband Mobile Communications Beijing100044 China Jiaxun Feihong Intelligent Technology Institute Beijing100044 China National Research Center of Railway Safety Assessment Beijing100044 China

ISBN: (数字)9789811529146

ISBN: (纸本)9789811529139

With the emergence of the demand for railway multimedia services, the railway mobile communication system has begun to develop rapidly toward long-term evolution for railway (LTE-R). We analyze the railway video service requirements, compare the standardization processes of the 3rd Generation Partnership Project (3GPP) and International Union of Railways (UIC), and find that there is currently no solution for the rail-specific video services. Based on the above reasons, this paper designs and develops a video call scheme using Function Number (FN) for the railway system to enable railway multimedia services. First of all, the feasibility of the Mission Critical (MC) Service to the railway is discussed. Secondly, Mission Critical System (MCS) in LTE-R is introduced. Then, the Mission Critical Video (MCVideo) software architecture is designed, and the FN-based video service procedure is proposed in this paper, including FN registration and FN-based MCVideo call. Finally, the potential of the proposed scheme is verified on the laboratory static testbed. The results show that the proposed video call scheme has good performance. © Springer Nature Singapore Pte Ltd. 2020.

关键词： Multimedia services

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Design of a high water-based fluid, high-pressure, and large-flow safety valve

Design of a high water-based fluid, high-pressure, and large...

引用

19th International Conference of Fluid Power and Mechatronic control engineering 2018

作者： Li, Geqiang Li, Liaoyuan Guo, Bingjing Li, Yuesong School of Mechatronics Engineering Henan University of Science and Technology Luoyang China Department of Measurement and Control Collaborative Innovation Center of Machinery Equipment Advanced Manufacturing of Henan Province China

Aiming at solving the problem of low unloading sensitivity, bad dynamic performance and poor stability of high-pressure and large-flow relief valve in hydraulic support system, a new differential type of high-pressure and large-flow relief valve, functioned by high water-based hydraulic medium, is designed. Through analysing the influence of spool form, elastic element, and working principle on valve performance, a structural scheme of large-flow and high-pressure safety valve is put forward. The three-dimensional fluid-solid coupling model of differential safety valve is established;through ADINA software, three-dimensional fluid-solid coupling simulation of relief valve's orifice from shutdown to full opening is carried out to analyse the distribution of internal pressure in the flow field of the safety valve and the pressure change of the structure field. The physical simulation model of safety valve is established by using AMESim software, and the dynamic performance of safety valve is simulated under the given signal of nominal flow and small flow. According to the design structure, the safety valve with the rated flow of 3000 L/min is manufactured and tested. The simulation and experimental results show that the safety valve has good dynamic performance and high sensitivity.. © 2019 Institution of engineering and technology. All rights reserved.

关键词： Computer software

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Performance analysis of intelligent reflecting surface assisted NOMA networks

arXiv

引用

arXiv 2020年

作者： Yue, Xinwei Liu, Yuanwei Key Laboratory of Modern Measurement and Control Technology Ministry of Education School of Information and Communication Engineering Beijing Information Science and Technology University Beijing100101 China School of Electronic Engineering and Computer Science Queen Mary University of London LondonE1 4NS United Kingdom

Intelligent reflecting surface (IRS) is a promising technology to enhance the coverage and performance of wireless networks. We consider the application of IRS to non-orthogonal multiple access (NOMA), where a base station transmits superposed signals to multiple users by the virtue of an IRS. The performance of an IRS-assisted NOMA networks with imperfect successive interference cancellation (ipSIC) and perfect successive interference cancellation (pSIC) is investigated by invoking 1-bit coding scheme. In particular, we derive new exact and asymptotic expressions for both outage probability and ergodic rate of the mth user with ipSIC/pSIC. Based on analytical results, the diversity order of the m-th user with pSIC is in connection with the number of reflecting elements and channel ordering. The high signal-to-noise radio (SNR) slope of ergodic rate for the m-th user is obtained. The throughput and energy efficiency of nonorthogonal users for IRS-NOMA are discussed both in delaylimited and delay-tolerant transmission modes. Additionally, we derive new exact expressions of outage probability and ergodic rate for IRS-assisted orthogonal multiple access (IRS-OMA). Numerical results are presented to substantiate our analyses and demonstrate that: i) The outage behaviors of IRS-NOMA are superior to that of IRS-OMA and relaying schemes;ii) With increasing the number of reflecting elements, IRS-NOMA is capable of achieving enhanced outage performance;and iii) The M-th user has a larger ergodic rate compared to IRS-OMA and benchmarks. However, the ergodic performance of the m-th user exceeds relaying schemes in the low SNR regime. Copyright © 2020, The Authors. All rights reserved.

关键词： Signal to noise ratio

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A Novel Learning Method for Electric Circuit Course

A Novel Learning Method for Electric Circuit Course

引用

2019 IEEE International Conference on Computer Science and Educational Informatization, CSEI 2019

作者： Zhao, Xufeng Mu, Xiangyang Zhang, Yaming School of Electronic Engineering Xi'an Shiyou University Xi'an China School of Electrical Engineering Shaanxi University of Technology Hanzhong China Shaanxi key Laboratory of Measurement and Control Technology for Oil and Gas Wells School of Electronic Engineering Xi'an Shiyou University Xi'an China Key Laboratory of Education Informalization for Nationalities Ministry of Education Yunnan Normal University Kunming China

ISBN: (纸本)9781728123080

In recent years, with the rapid development of mobile Internet technology and intelligent mobile terminal equipment, mobile learning has been widely used in various teaching modes and attained good teaching effectiveness. By introducing the mobile learning mode into the electric circuit teaching in universities and combining with the traditional teaching mode, this paper discussed the notion of the application of Wechat platform to create a learning environment. Then elaborated the designing of mobile learning environment mode and the evaluation mechanism of learning effectiveness, and finally presented and analyzed the data obtained from the new teaching mode. Through nearly three years of application of the mode into the teaching for students majoring in electric automation, the mobile learning effectiveness has become gradually outstanding, compared with the learning method applied in the traditional teaching mode. The number of the students involved in mobile learning in the past three years has increased from 60% to 96.75,%. And the passing rate has risen from 50% to 86.7%. In general, the new teaching methodology has become popular with the students. © 2019 IEEE.

关键词： Students

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Preferred Hierarchical control Strategy of Non-Point Source Pollution at Regional Scale

Research Square

引用

Research Square 2021年

作者： Wen, Weijia Zhuang, Yanhua Zhang, Liang Li, Sisi Ruan, Shuhe Zhang, Qinjing Institute of Geodesy and Geophysics Chinese Academy of Sciences China Hubei Provincial Engineering Research Center of Non-Point Source Pollution Control Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan430077 China University of Chinese Academy of Sciences Beijing100049 China School of Resource and Environmental Sciences Wuhan University Wuhan430079 China

Non-point source (NPS) pollution has wide range of sources. Under rainfall conditions, NPS pollution occurs mainly by overland flow, resulting in difficult governance. In this study, based on the cooperative analysis of critical periods (CPs) and critical source areas (CSAs), a preferred hierarchical control strategy of NPS pollution, which was connected with management units, was proposed in the Danjiangkou Reservoir Basin (DRB) to improve the pertinence of NPS pollution control. The practicality of the grid-based CSA identification results was improved by point density analysis (PDA). CPs, sub-CPs, and non-CPs were identified on the temporal scale;CSAs, sub-CSAs and non-CSAs were identified on the spatial scale. The results showed that CPs (July, April, and September), sub-CPs (May, March, and August), and non-CPs contributed 62.8%, 31.1%, and 6.1% of the annual TP loads, respectively. Furthermore, we proposed a hierarchical NPS pollution control strategy: class Ⅰ (CSAs in CPs) → class II (sub-CSAs in CPs, CSAs in sub-CPs) → class III (non-CPs, non-CSAs, sub- and non-CSAs in sub-CPs). Class Ⅰ covered the periods and areas with the highest NPS pollution loads, contributing 26.2% of the annual load within 14.5% of the area and 25.0% of the time. This study provides a reference for the targeted control of NPS pollution at regional scale, especially in environmental protection with limited funds. © 2021, CC BY.

关键词： Pollution control

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Rate Analysis of Quantized MIMO Systems with Transmit Channel State Information

Rate Analysis of Quantized MIMO Systems with Transmit Channe...

引用

International Conference on communications, Signal Processing, and Systems, CSPS 2018

作者： Ling, Xiaofeng Wang, Rui Gao, Zhaozhao The School of Information Science and Engineering East China University of Science and Technology Shanghai200237 China The Department of Information and Communications Tongji University Shanghai201804 China Science and Technology on Electronic Information Control Laboratory Chengdu China

ISBN: (纸本)9789811362637

The achievable rate of the multi-input multi-output (MIMO) channel with low-resolution receiver ADCs is analyzed. With the channel state information at both the transmitter and receiver, we jointly optimize the transmit signal and the receiving analog combiner with an aim to improve the performance. To this goal, the approximate achievable rate of considered channel model is first obtained using the Bussgang theorem. After that, the singular-value decomposition (SVD) based approach is proposed to enable the joint optimization. Our simulation results show that the proposed design is able to reach the capacity at low signal-to-noise ratio (SNR). © 2019, Springer Nature Singapore Pte Ltd.

关键词： Channel state information

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