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Impact of coupling coordination development of port and city environments on urban economic competitiveness:Evidence from the coastal port cities in eastern China

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Ecological Economy 2024年第1期20卷 53-71页

作者： li zhen-qiang YI Ying li Jia-li YOU Xiao-yue ZHOU Qiu-yang School of Economics and Management Hunan Institute of Science and TechnologyYueyang 414006CHINA School of Urban and Regional Science Shanghai University of Finance and EconomicsShanghai 200433CHINA

Promoting the coupling coordination development of port and its hinterland city environments is an important way to improve urban economic *** on relevant data of 13 coastal port cities in eastern China from 2000 to 2018,this study explores the coupling coordination development of port and city environments and its impact on urban economic competitiveness by constructing the coupling coordination degree model and the panel threshold *** research results show that:(1)In terms of the coupling coordination development of port and city environments,most coastal ports and their hinterland cities are in a state of moderate or serious ***,the degree of coupling coordination of port and city environments needs to be further improved;(2)The coupling coordination degree of port and city environments has a significant impact on urban economic competitiveness,and this effect gradually increases with the development of the ports and the urban *** the variables that impact the urban economic competitiveness,fixed assets investment and foreign trade are significant factors that can enhance urban economic competitiveness.(3)At present,there is a“U-shaped”relationship between the coupling coordination degree of port-city environments and the urban economic *** relationship lies on the right side of the inflection point of the“U-shaped”***,following the concept of assigning priority to ecological development,expanding fixed assets investment and actively developing foreign trade can further enhance the urban economic competitiveness.

关键词： coastal ports city environments coupling coordination degree urban economic competitiveness threshold effect

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数字经济时代学术型硕士研究生创新能力影响因素综合评价研究

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湖南财政经济学院学报 2024年第1期40卷 116-124页

作者：黎振强彭菲凡汤小红湖南理工学院经济与管理学院湖南岳阳414006

培养符合数字经济时代发展需求的创新型人才是研究生教育教学改革的重点方向。学术型硕士研究生的创新能力受到学生自身、导师指导、创新实践、培养条件等因素影响,构建学术型硕士研究生创新能力影响因素综合评价指标体系,采用层次分析... 详细信息

培养符合数字经济时代发展需求的创新型人才是研究生教育教学改革的重点方向。学术型硕士研究生的创新能力受到学生自身、导师指导、创新实践、培养条件等因素影响,构建学术型硕士研究生创新能力影响因素综合评价指标体系,采用层次分析法-模糊综合评价法对湖南理工学院应用经济学学术型硕士研究生创新能力进行评价。研究发现,准则层中,学生自身因素是影响研究生创新能力的关键;指标层中,学生个人主动性、导师学术造诣、科研活动和激励机制是影响研究生创新能力的四个主要因素。因此,高校应在增强学生学习自主性、建设数字化创新型导师队伍、对接数字行业发展需求、构建跨学科培养模式和完善评价激励机制等方面提升学术型硕士研究生创新能力。

关键词：数字经济层次分析法模糊综合评价法创新能力学术型硕士研究生

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Metabolomic-based analysis reveals bile acid-mediated ovarian failure induced by low temperature in zebrafish

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Zoological Research 2024年第4期45卷 791-804页

作者： Wen-Hao li Zhi-qiang li Meng-Di Bu Jia-zhen li liang-Biao Chen Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources Ministry of EducationCollege of Fisheries and Life SciencesShanghai Ocean UniversityShanghai 201306China Laboratory for Marine Biology and Biotechnology Qingdao National Laboratory for Marine Science and TechnologyQingdaoShandong 266237China International Research Center for Marine Biosciences Ministry of Science and TechnologyCollege of Fisheries and Life SciencesShanghai Ocean UniversityShanghai 201306China

As ectotherms,fish are highly sensitive to temperature fluctuations,which can profoundly impact their reproductive *** this study,we investigated the fertility and histological characteristics of zebrafish(Danio rerio)ovaries exposed to a temperature gradient ranging from the thermopreferendum temperature of the species,27°C,to lower temperatures of 22°C,20°C,and 13°C over a period of two *** metabolomic(six biological replicates for each temperature)and transcriptomic(four biological replicates for each temperature)analyses were conducted under the four temperature *** indicated that lower temperatures inhibited oocyte development and differential metabolites were involved in steroid hormone production,antioxidant function,and lipid and protein *** reproductive hormones,increased proteolysis,and lipid degradation significantly impeded oocyte development and egg ***,a significant increase in bile acid content was noted in the ovaries of the cold-treated fish,indicating that bile acids play a critical role in ovarian ***,these findings provide valuable insights into the mechanisms governing the reproductive response of fish to cold stress.

关键词： old stress Ovarian failure Metabolome Zebrafish

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地连墙H型钢接头声波透射法检测试验方案研究

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广州建筑 2024年第4期52卷 38-42页

作者：赵晶王斌陈龙辉安宏斌李振强王康中铁十一局集团第一工程有限公司襄阳441104 中国铁建投资集团有限公司北京100855 武汉工程大学土木工程与建筑学院武汉430074

地下连续墙已被广泛应用于基坑工程中,而超深地下连续墙槽段接头处的施工质量问题仍未得到有效解决。为探究如何检测超深地连墙H型钢接头处混凝土密实度这一工程问题,本文以武汉城市轨道交通12号线中一路地铁车站超深大基坑工程地连墙... 详细信息

地下连续墙已被广泛应用于基坑工程中,而超深地下连续墙槽段接头处的施工质量问题仍未得到有效解决。为探究如何检测超深地连墙H型钢接头处混凝土密实度这一工程问题,本文以武汉城市轨道交通12号线中一路地铁车站超深大基坑工程地连墙为研究背景,介绍了声波透射法的检测原理,对应用声波透射法检测地连墙H型钢接头处混凝土密实度的方案进行研究,并设计了具体的模型试验方案。研究表明:声波透射法检测地连墙H型钢密实度有良好的工程价值;现场测试结果与试验设计基本一致;后期通过分析总结模型试验结果可得到不同密实度下的声参量数据库,以期为其实际应用提供科学指导与决策。

关键词：地下连续墙声波透射法模型试验混凝土密实度型钢接头

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Influence of filler characteristics on particle removal in fluid catalytic cracking slurry under an alternating electric field

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Petroleum Science 2024年第3期21卷 2102-2111页

作者： qiang li Hui-zhen Yang Can Yang Qing-Zhu Qiu Wei-Wei Xu Zhao-Zeng liu College of New Energy China University of Petroleum(East China)

The characteristics of the packing material under an alternating electric field are an important factor in the removal of FCCS particles. In this study, the electric field distribution of a separation unit consisting of packed spheres under an alternating electric field is simulated, and the movement mechanism of catalyst particles is analysed. An "effective contact point" model is derived to predict the adsorption of filler contact points on catalyst particles under the alternating electric field, and the model is validated by simulations and experiments. The numerical calculation and experimental results indicate that the electrical properties of the filler spheres, the filler angle θ, and the frequency f of the alternating electric field affect the adsorption of catalyst particles. As the frequency of the electric field increases, the particle removal efficiency of the high-conductivity filler(silicon carbide) increases and then settles, and the separation efficiency of the low-conductivity filler(glass, zirconia) is not sensitive to the change in electric field frequency.

关键词： Fluid catalytic cracking slurry (FCCS) Particle AC electric field Fillers Removal

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Embeddings Among Quantum Affine sl_(n)

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Acta Mathematica Sinica,English Series 2024年第3期40卷 792-805页

作者： Yi qiang li Department of Mathematics University at BuffaloThe State University of New YorkBuffaloNY 14260USA

We establish an explicit embedding of a quantum affine sl_(n) into a quantum affine sl_(n)+*** embedding serves as a common generalization of two natural,but seemingly unrelated,embed-dings,one on the quantum affine Schur algebra level and the other on the non-quantum *** embedding on the quantum affine Schur algebras is used extensively in the analysis of canonical bases of quantum affine sln and gl_(n).The embedding on the non-quantum level is used crucially in a work of Riche and Williamson on the study of modular representation theory of general linear groups over a finite *** same embedding is also used in a work of Maksimau on the categorical representations of affine general linear *** further provide a more natural compatibility statement of the em-bedding on the idempotent version with that on the quantum affine Schur algebra level.A gl_(n)-variant of the embedding is also established.

关键词： Quantum affine sl_(n) embeddings

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Spatiotemporal variations in glacier area and surface velocity of the northern Antarctic Peninsula during 2018-2022

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Advances in Climate Change Research 2024年第2期15卷 297-311页

作者： Yu-Long KANG Shi-Chang KANG Wan-Qin GUO Tao CHE Zong-li JIANG zhen-Feng WANG qiang-qiang XU Cheng-De YANG State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100083China Key Laboratory of Remote Sensing of Gansu Province Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Earth Sciences and Spatial Information Engineering Hunan University of Science and TechnologyXiangtan 411201China

Ice sheet serves as a crucial indicator for assessing climate *** loss in recent remote sensing-based studies indicated that the Antarctic Peninsula has rapid rates of glacier retreat and speed up of surface ***,observations of seasonal variability of ice speed are limited,and glacier-area changes require multi-temporal *** study investigated the changes in area and surface velocities of∼375 glaciers on the northern Antarctic Peninsula(NAP)utilizing satellite images acquired by the Sentinel 1&2 satellites during *** results indicate that the glacier area reduced by approximately 166.1±44.2 km^(2)(-0.2%±0.1%per year)during the study period,with an acceleration after 2020(-0.4%±0.3%per year),and the most dramatic reduction happened on the eastern *** maximum annual ice speeds on the NAP generally exceeded 3500 m per year,while the ice speeds in 2021 were the highest(exceeded 4210 m per year).The ice speed variability in austral autumn was higher than in other seasons,meanwhile the summer ice speeds showed an increasing *** glacier G012158E47018N,McNeile Glacier,glacier G299637E64094S and Drygalski Glacier showed the most remarkable ice speed variations represented by high daily velocities and strong fluctuations on their *** results demonstrated that the variations in glacier area and seasonal ice speed on the NAP were responsive to the ice-ocean-atmosphere ***,seasonal velocity and area variations should be considered when conducting accurate mass balance calculations,model validations and change mechanism analyses under climate warming scenarios.

关键词： Glacier area Seasonal ice speed Sentinel 1&2 Northern Antarctic Peninsula Ice-ocean-atmosphere processes

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A New Industrial Intrusion Detection Method Based on CNN-BiLSTM

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Computers, Materials & Continua 2024年第6期79卷 4297-4318页

作者： Jun Wang Changfu Si zhen Wang qiang Fu College of Computer Science and Technology Shenyang University of Chemical TechnologyShenyang110142China

Nowadays,with the rapid development of industrial Internet technology,on the one hand,advanced industrial control systems(ICS)have improved industrial production ***,there are more and more cyber-attacks targeting industrial control *** ensure the security of industrial networks,intrusion detection systems have been widely used in industrial control systems,and deep neural networks have always been an effective method for identifying cyber *** intrusion detection methods still suffer from low accuracy and a high false alarm ***,it is important to build a more efficient intrusion detection *** paper proposes a hybrid deep learning intrusion detection method based on convolutional neural networks and bidirectional long short-term memory neural networks(CNN-BiLSTM).To address the issue of imbalanced data within the dataset and improve the model’s detection capabilities,the Synthetic Minority Over-sampling Technique-Edited Nearest Neighbors(SMOTE-ENN)algorithm is applied in the preprocessing *** algorithm is employed to generate synthetic instances for the minority class,simultaneously mitigating the impact of noise in the majority *** approach aims to create a more equitable distribution of classes,thereby enhancing the model’s ability to effectively identify patterns in both minority and majority *** the experimental phase,the detection performance of the method is verified using two data *** results show that the accuracy rate on the CICIDS-2017 data set reaches 97.7%.On the natural gas pipeline dataset collected by Lan Turnipseed from Mississippi State University in the United States,the accuracy rate also reaches 85.5%.

关键词： Intrusion detection convolutional neural network bidirectional long short-term memory neural network multi-head self-attention mechanism

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Object Helps U-Net Based Change Detectors

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IEEE/CAA Journal of Automatica Sinica 2024年第2期11卷 548-550页

作者： Lan Yan qiang li Kenli li College of Computer Science and Electronic Engineering Hunan UniversityChangsha 410082China State Key Laboratory for Management and Control of Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China

Dear Editor,This letter focuses on leveraging the object information in images to improve the performance of the U-Net based change *** detection is fundamental to many computer vision *** existing solutions based on ... 详细信息

关键词： Net computer networks

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Deformation and stability of the seawall,considering the strength uncertainty of cement mixing piles

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第6期25卷 483-501页

作者： Yuansheng YU lingling li Xiangmiao KONG Chengyuan li zhen GUO Key Laboratory of Offshore Geotechnics and Material of Zhejiang Province College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou310058China Hainan Institute Zhejiang UniversitySanya572000China Ninghai Highway and Transportation Management Center Ningbo315600China Ninghai Traffic Engineering Construction Management Institute Ningbo315600China

The cement mixing (CM) pile is a common method of improving soft offshore ground. The strength growth of CM piles under complex conditions is affected by many factors, especially the cement and moisture contents, and shows significant uncertainty. To investigate the stochasticity of the early strength of CM piles and its impact on the displacement and stability of a seawall, a series of laboratory tests and numerical analyses were carried out in this study. Vane shear tests were conducted on the cement-solidified soil to determine the relationships between the undrained shear strength s_(u) of the cement soil curing in the seawater and the cement content a_(c), as well as the in situ soil moisture content w. It can be inferred that the 24 h undrained shear strength follows a normal distribution. A numerical model considering the random CM pile strength was established to investigate the deformation of the seawall. Due to the uncertainty of CM pile strength, the displacement of the seawall demonstrates a certain discreteness. The decrease of the mean undrained shear strength of CM piles causes a corresponding increase in the average displacement of the seawall. When the mean strength of CM piles is lower than a certain threshold, there is a risk of instability. Furthermore, the heterogeneity of the strength within an individual CM pile also has an impact on seawall displacement. Attention should be paid to the uncertainty of CM pile strength to control displacement and stability.

关键词： Construction uncertainty Cement mixing(CM)pile Strength of cement soil Seawall stability Random finite element method(RFEM) Monte Carlo simulation(MCS)

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