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2022 International conference on data Analytics, computing and Artificial Intelligence, ICdACAI 2022

作者： Zou, Yunhua Chen, Jun Cheng, Chen Huang, rong Fang, Shaohong Hubei Jiaotou Intelligent Testing Co Ltd Wuhan China Hubei Jiaotou Intelligent Testing Co Ltd Highway Construction and Maintenance Technical Materials and Equipment R&D Center Wuhan China Wuhan Teng Road ITS Co. Ltd Wuhan China College of Software Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9781665454704

ISBN: (纸本)9781665454704

Cement concrete strength quality is tested by the standard testing methods and the historic test results always documented in the formatted formal reports. They are difficult to gear for quality data analysis from multi-dimensional. Firstly, according to data engineering, the data attributes refer to time and strength quality in original cement concrete test reports are defined, extracted and preprocessed;Secondly, by time sliding windows the historic strength test data are divided into dynamic time periods and the features of mean, variation, median, coefficient of variation, mode, and full distance are constructed during every time period. Finally, the detailed evaluation results of cement concrete strength quality are provided by integrating the multi-features of multi-periods. Experimental results show that the raw data are defined and preprocessed to be less redundancy and reliable by data engineering and the integrated evaluation results become more accuracy and effective by the dynamic time series features. © 2022 IEEE.

关键词： Time series

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research on Key Technologies of real Scene 3d Cloud Service Platform for digital Twin Cities 22

Research on Key Technologies of Real Scene 3D Cloud Service ...

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8th International conference on E-Business and Mobile commerce, ICEMC 2022

作者： Pan, Tiejun Zheng, Leina Zhu, ren Dept. of Information Engineering College of Science and Technology Ningbo University China Ningbo University of Finance & Economics China Dept. of Exhibition Zhejiang Wanli College China Dept. of R&d Ningbo Meixiang Information Technology Co. Ltd. China

ISBN: (纸本)9781450397162

Based on the background of real 3d China construction, this paper develops real scene 3d cloud service platform for digital Twin Cities to solve the difficulties of Urban fine governance, deeply analyzes the key problems of digital twin cities, gives advanced solutions combined with the development of new generation information technology, including high precision urban 3d data acquisition and preprocessing, integration and storage of urban 3d reality data, information fusion of urban dynamic data and 3d reality, intelligent classification and positioning of urban management objects, demonstrates its feasibility, applies it to the construction of future communities, and points out the innovation of the scheme including fusion innovation of city perception data and 3d real city scene based on new generation artificial intelligence, Semantic automatic recognition method of small objects in 3d scene based on urban real scene, and hybrid model simulation method for urban application and management. © 2022 ACM.

关键词： Semantics

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Automated design of FSr-Free Silicon Photonics Microring Filters Based on Sparse Spectral response

Automated Design of FSR-Free Silicon Photonics Microring Fil...

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Asia communications and Photonics conference and Exhibition (ACP)

作者： Yu Chen Meilin Zhong Gangxiang Shen Gordon Ning Liu Wei Cao Shenghao Liu Xiaogang Chen Xu Sun School of Electronic and Information Engineering Soochow University Suzhou China Silicon Photonics R&D Center CreaLights Technology Co. Ltd. Suzhou China

We present an automated design method for FSr-Free silicon photonics microring filter. The sparsity of the filter spectral response is utilized as an evaluation metric. Simulation results demonstrate the effectiveness...

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A Multi-Sampled Pulse Width Modulator in dC-AC converters for Eliminating Vertical Crossings

A Multi-Sampled Pulse Width Modulator in DC-AC Converters fo...

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PELS Students and Young Professionals Symposium (SYPS), IEEE

作者： Zhengyuan Zhou Zeng Liu Peibo Liu Xincheng dai Jinjun Liu Ming Zhao School of Electrical Engineering Xi’an Jiaotong University Xi’an China R&D Department Xi’an Weiguang Energy Technology Co. Ltd. Xi’an China

Multisampling method is one of the effective solutions to reduce control delay. However, the method introduces switching ripple to the control loop, causing vertical crossings which eventually leads current distortion. This paper proposes a novel multi-sampled pulse width modulator for dC-AC converters to eliminate the vertical crossings, which estimates the switching instant with analog PWM and adds a compensation on the modulation signal to approximate the switching instant. The proposed control scheme features better dynamic performance than existing schemes. The effectiveness of the proposed modulator is validated by simulation results.

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Influence of Fractures on co2 Huff-n-Puff Effect of Staged Fractured Horizontal Wells in Tight Oil reservoirs 11th

Influence of Fractures on CO2 Huff-n-Puff Effect of Staged F...

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11th International Field Exploration and development conference, IFEdC 2021

作者： Zhou, Tuo Zhong, Zhao Chen, Chi Yang, Hui Xiao, Yue Baletabieke, Bahedaer Kong, Xiang-ji Zhou, Chuan Xiang, Ying Gao, Qing-yun Tian, Yajie CNPC Engineering Technology R&D Company Limited Beijing China Exploration Division PetroChina Southwest Oil and Gasfield Company Chengdu China China Petroleum Technical Service Corporation Limited Beijing China China National Oil and Gas Exploration and Development Company Ltd. Beijing China Research Institute of Petroleum Exploration and Development Beijing China

ISBN: (纸本)9789811921483

Tight oil has become a new growth point for global oil and gas reserves and production. conventional tight oil reservoirs are mainly developed in depletion mode, and water flooding cannot effectively supplement formation energy. co2 has strong advantages in terms of elasticity, mutual solubility with crude oil, etc., and is considered to be an effective way to supplement energy. At present, staged fracturing of horizontal wells has gradually become the main development method for tight oil reservoirs, but it still fails to meet production requirements. In this paper, taking the Chang 8 tight oil reservoir in the Ordos Basin as an example, it is the first time to use a combination of physical simulation and numerical simulation, and use an original large-scale physical simulation experiment system to focus on the impact of fractures on the co2 huff-n-puff effect of staged fractured horizontal wells in tight oil reservoirs. Through the original large-scale physical simulation experiment system (which can simulate a 50 * 50 * 6 cm core), using a combination of physical simulation and numerical simulation to analyze the impact of fractures on the co2 huff-n-puff effect of horizontal wells with staged fracturing. Studies have shown that fracture length and fracture density are the main controlling factors that affect the co2 huff-n-puff effect of staged fracturing horizontal wells, and reasonable fracture parameters are the key to improving development efficiency. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte ltd.

关键词： Fracture

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A Hybrid reactive Power Perturbation Islanding detection Method Based on double Trigger conditions

A Hybrid Reactive Power Perturbation Islanding Detection Met...

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Energy Storage and conversion (ISESC), CPSS & IEEE International Symposium on

作者： Yikun Pan Jinghua Zhou Ningning Wang Shuangshuang rong School of Energy Storage Science and Engineering North China University of Technology Beijing City China PCS R&D Department SYL (Ningbo) Battery Co. Ltd. Ningbo City China

ISBN: (数字)9798350380514

ISBN: (纸本)9798350380521

In the context of grid-connected power electronic devices, particularly power conversion systems (PCS), traditional bilateral reactive power perturbation techniques are plagued by challenges associated with unpredictable detection times and pronounced detrimental effects on power quality. Meanwhile, unilateral reactive power perturbation methods encounter similar difficulties in effectively managing detection durations. This paper, taking into account the operational conditions both preceding and following the occurrence of islanding, conducts a thorough analysis of the fundamental principles of reactive power perturbation. It subsequently establishes an approximate linear correlation between reactive power perturbation and the frequency at the point of common coupling (PCC) subsequent to islanding. Building upon this analysis, the paper introduces the design rationale for a dual-trigger mechanism for reactive power perturbations, which integrates the strengths of both perturbation methodologies. consequently, a novel hybrid reactive power perturbation-based islanding detection method, conditioned upon these dual triggers, is proposed. Through comprehensive hardware-in-the-loop (HIL) simulations, the results conclusively demonstrate that this method exhibits minimal disruption to output power quality, exhibits robust adaptability to grid frequency fluctuations, effectively eliminates detection blind zones, and ensures precise control over the timing of islanding detection.

关键词： reactive power Islanding Perturbation methods Hardware-in-the-loop simulation Power quality Hybrid power systems Power electronics Timing Power conversion Power generation

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A comprehensively Introduction and Analysis of AVS3 Entropy coding

A Comprehensively Introduction and Analysis of AVS3 Entropy ...

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data compression conference (dCC)

作者： Bin Guo Jianchao Wei Shanshe Wang Hui Ma Jiaqi Zhang Shenzhen International Graduate School Tsinghua University China Konka Grp Co Ltd China BEIJING BOYA RUISHI TECHNOLOGY CO. LTD China National Engineering Research Center of Visual Technology School of Computer Science Peking University China Information Technology R&D Innovation Center of Peking University China

ISBN: (数字)9798331534714

ISBN: (纸本)9798331534721

This paper elaborates the binary bin distribution of each syntax element in AVS3. The overall syntax elements in AVS3 can be divided into context-Modeled(CM) Bin, Bypass(BPS) Bin, Weighted context-Modeled(WCM) Bin. A comprehensive and quantitative analysis on these bitstreams are conducted and the result is shown in Fig. 1. Moreover, Fig. 2 illustrates the distribution of CM Bin, BPS Bin, and WCM Bin across various resolutions and QPs. The analysis reveals insightful correlations between the types of binary symbols and syntax elements within the AVS3 bitstream. Through this analysis, we aim to contribute to the implementation of AVS3 codecs.

关键词： correlation codecs Statistical analysis Symbols data compression Syntactics Entropy coding Binary sequences

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A tight sandstone multi-physical hydraulic fractures simulator study and its field application

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Petroleum 2020年第2期6卷 198-205页

作者： Yonghong Wang Binshan Ju Shihao Wang Zhenzhou Yang Qing Liu School of Energy Resource China University of GeoscienceBeijingChina CNPC Engineering Technology R&D Company Limited(CPET) China Petroleum Engineering Department Colorado School of MinesGoldenCO80401USA

during the past years,the recovery of unconventional gas formation has attracted lots of attention and achieved huge *** produce gas from the low-permeability unconventional formations,hydraulic fracturing technology is essential and *** this paper,we present the development of a three-dimensional thermalhydraulic-mechanical numerical simulator for the simulation of hydraulic fracturing operations in tight sandstone *** simulator is based on integrated finite difference(IFd)*** this method,the simulation domain is subdivided into sub domains and the governing equations are integrated over a sub domain with flux terms expressed as an integral over the sub domain boundary using the divergence *** simulator conducts coupled thermal-hydraulic-mechanical simulation of the initiation and extension of hydraulic *** also calculates the mass/heat transport of injected hydraulic fluids as well as *** simulator is able to handle anisotropic formations with multiple *** simulator has been validated by comparing with an analytical solution as well as ribeiro and Sharma *** model can simulate fracture spacing effect on fracture profile when combining IFd with discontinuous displacement Method(ddM).

关键词： Tight sandstone Hydraulic fracture simulator Integrated finite difference discretization Stress contrast

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Experimental Study on Arcing in Thermal Propagation of Lithium-Ion Battery Systems

SSRN

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SSrN 2024年

作者： Li, Zhaoyang Liu, dinghong Li, Haibin dong, Wenkai Zhang, Hongzhu Tian, Yongjun Liu, Lei Co. Ltd. Changzhou213000 China China Automotive Technology and Research Center Co. Ltd. Tianjin300300 China Jiangsu Province Engineering Technology Research Center of Optical Storage Charging and Testing Integrated R&D and Application Changzhou213000 China

With the widespread integration of lithium-ion batteries in electric vehicles and energy storage systems, ensuring their safety remains a top priority. researchers have diligently studied the thermal runaway and propagation mechanisms of these batteries to enhance their safety features. despite significant progress in addressing thermal runaway and propagation, the sporadic occurrence of high-voltage arc phenomena remains a persistent concern, contributing to thermal propagation and potential fires within lithium-ion battery systems. To tackle this challenge, this study introduces a dedicated experimental setup employing a 280Ah lithium iron phosphate (LFP) battery as the samples to be studied. By replicating typical arcing processes at an experimental level, the investigation uncovers crucial insights. Specifically, it reveals that at about 316V, distances less than 4mm between positive and negative terminals can induce breakdown, resulting in arcing and severe combustion triggered by the gas and smoke released during thermal runaway from a single cell. Furthermore, the study proposes an experimental methodology to delve into arcing phenomena and effectively reconstructs the ignition process caused by arcing. Additionally, it suggests exploring the arcing boundary and researching methods for arcing suppression as vital avenues for further exploration. © 2024, The Authors. All rights reserved.

关键词： Lithium-ion batteries

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Multilevel Evaluation Method of Acoustic Frequency Spectrum in Periodic Pipe Structure Based on Improved radar Chart Method

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Science technology and engineering 2025年第2期25卷 521-529页

作者： Yan, Yan Han, Li-Hong Liu, Yong-Hong Guan, Zhi-Chuan Wang, Qing State Key Laboratory of Oil and Gas Equipment CNPC Tubular Goods Research Institute Xi’an710077 China Qingdao266580 China School of Petroleum Engineering China University of Petroleum Qingdao266580 China CNPC Engineering Technology R&D Co. Beijing102206 China

Acoustic wave is one of the important means to realize the fast and accurate transmission of downhole information. The drill string serving as information transmission channel has obvious periodic pipe structure characteristics. In order to study the frequency spectrum quality of drill string channel in actual working conditions, a multilevel evaluation method of acoustic frequency spectrum based on improved radar chart was provided. The influence of axial tension stress on the frequency spectrum characteristics of acoustic wave in pipe structure was studied and analyzed by the method, and the criteria for judging the frequency spectrum characteristics were established. Practice shows that, the existence of tensile stress has a significant impact on the acoustic frequency spectrum and passband characteristics. With the increase of tensile stress, the evaluation index of frequency spectrum characteristic increases first and then decreases, and there exists a peak point with the best frequency spectrum characteristic. This method can comprehensively reflect the influence of different factors on the frequency spectrum characteristics of acoustic wave in drill string channel, and comprehensively evaluate the distortion degree of frequency spectrum characteristics from the multiple perspectives. It provides a basis for optimizing carrier frequency and designing the installation position of repeater when dealing with multi-factors interference in the field application of downhole information acoustic transmission technology. © 2025 Beijing Kexue Jishu yu Gongcheng Zazhishe. All rights reserved.

关键词： Tensile stress

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