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Optimization of Urban Ecological Network Based on MSPA-MCR Model: A Case Study of Jingzhou City

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Journal of Landscape Research 2024年第2期16卷 30-34页

作者： LI Shusheng zeng junfeng College of Horticulture and Gardening Yangtze UniversityJingzhouHubei 434025China

As a key carrier supporting urban ecological health and living environment quality,urban ecological network is a key focus of current urban green space *** City of Hubei Province is taken as the research *** on GIS technology platform,MSPA method is used to analyze the landscape pattern of Jingzhou *** this basis,the landscape connectivity evaluation method is used to accurately identify and extract the source areas with important ecological value in Jingzhou ***,the normalization method and weighting method are combined to create a resistance factor evaluation system to construct the resistance *** on the MCR model,the ecological network of Jingzhou City is successfully constructed,and targeted spatial optimization strategies and development suggestions are proposed.

关键词： Ecological network MSPA Landscape connectivity evaluation Normalization method MCR model Ecological source area Jingzhou City

Exploration of Graduate Student Cultivation Mode of Landscape Architecture under the Background of“Artificial Intelligence+X”

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Journal of Landscape Research 2024年第1期16卷 67-69,76页

作者： CAO Yangyang zeng junfeng College of Horticulture and Gardening Yangtze UniversityJingzhouHubei 434025China

Under the background of“artificial intelligence+X”,the development of landscape architecture industry ushers in new opportunities,and professional talents need to be updated to meet the social *** paper analyzes the cultivation demand of landscape architecture graduate students in the context of the new era,and identifies the problems by comparing the original professional graduate training *** new cultivation mode of graduate students in landscape architecture is proposed,including updating the target orientation of the discipline,optimizing the teaching system,building a“dualteacher”tutor team,and improving the“industry-university-research-utilization”integrated cultivation,so as to cultivate high-quality compound talents with disciplinary characteristics.

关键词： Artificial intelligence+ Landscape architecture Graduate training model Professional talent

Switched-capacitor Based Seven-level Boost Inverter with a Reduced Number of Devices

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 381-391页

作者： Weijie Lin Jun zeng Bo Fu Zhixing Yan junfeng Liu School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China WISDRI Engineering&Research Incorporation Limited Wuhan 430074China Department of Energy Aalborg UniversityAalborg 9220Denmark School of Automation Science and Engineering South China University of TechnologyGuangzhou 510641China

The conventional multilevel inverters(MLIs)have the disadvantages of numerous devices,incapacity of boost,unbalance for capacitor’s voltage,high complexity for control,and *** by this issue,a seven-level boost inverter(7LBI)based on a switched capacitor is presented for singlephase applications in this *** proposed 7LBI using only seven transistors can achieve seven output levels,1.5 voltage gain,and natural balance of capacitors’voltages without sensors or other auxiliary methods,which illustrates its suitability for the applications of renewable energy *** configuration of topology and operating principles are illustrated in *** natural balance of capacitors and capacitance calculations are deduced as ***,the comparative study is conducted for different types of *** results illustrate the merits of the proposed 7LBI with respect to reduced devices,lower voltage stress,and less power ***,a simulation for the proposed 7LBI with PWM modulation is realized based on the theoretical analysis;an experimental prototype is also implemented,verifying multilevel output,boost ability,natural balance for switched capacitors,and performance of transient response.

关键词： Multilevel inverters voltage gain natural balance renewable energy generation reduced number of elements

一株高产普鲁兰多糖短梗霉菌株的基因组分析及产糖机理探究

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信阳师范学院学报（自然科学版） 2024年第3期37卷 349-359页

作者：杨静王文茹张瑞华孙思琦李碧琪石悦曾俊峰山西医科大学基础医学院山西太原030606 中国科学院天津工业生物技术研究所天津300308

从分子水平解析微生物的基因组变化,从而对其进行遗传改造以提高普鲁兰多糖的产量是目前亟待解决的问题。通过比较基因组学方法,对一株高产普鲁兰多糖的出芽短梗霉(TN-31)与其他短梗霉菌株进行了基因组比较。结果显示,该菌株发生了基因... 详细信息

从分子水平解析微生物的基因组变化,从而对其进行遗传改造以提高普鲁兰多糖的产量是目前亟待解决的问题。通过比较基因组学方法,对一株高产普鲁兰多糖的出芽短梗霉(TN-31)与其他短梗霉菌株进行了基因组比较。结果显示,该菌株发生了基因组加倍,其基因组中存在大量的遗传变异,这可能是其高产普鲁兰多糖的重要原因。此外,该菌株的基因组大小高于其他短梗霉菌株,其特有基因和功能基因启动子区的特殊调控序列可能赋予其不同于其他短梗霉菌株的特性。这种特殊表型可能是适应性进化的结果,通过遗传变异和适应性选择,能够适应其所处的环境。

关键词：普鲁兰多糖短梗霉菌株食品加工次级代谢产物适应性进化比较基因组学

Exploration of the mechanism of cavitation vortex rope and vortex development in the draft tube of tubular turbine units

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International Journal of Agricultural and Biological Engineering 2024年第1期17卷 163-171,F0002页

作者： Chuang Cheng Zhenggui Li Changrong Shen Shenglong Gu Chuchu zeng Chuanzheng Bai Meng Liu junfeng Hu Qinghai University of Science and Technology Xining 810000China Key Laboratory of Fluid and Power Machinery Ministry of Education(Xihua University)Chengdu 610039China South-to-North Water Diversion East Jiangsu Water Source Co. Ltd.Nanjing 210029China School of civil engineering and water resources Qinghai UniversityXining 810016China Dongyuan Branch of Shenzhen Water Planning and Design Institute Co. Ltd.Changsha 410000China

Draft tube vortex rope is considered a special cavitation flow phenomenon in tubular turbine *** vortex rope is one of the most detrimental factors affecting the safety of hydraulic *** this study,ANSYS CFX software was utilized to numerically simulate the internal cavitation flow of a hydraulic turbine draft *** evolution of the cavitation vortex core was characterized by vortex line distribution and vorticity transport *** shape and number of blades influenced the revolving direction and distribution characteristics of the vortex close to the runner cone,which formed a counterclockwise-clockwise-counterclockwise distribution ***,there were many secondary flows in the draft *** cancellation and dissipation between the flows was one of the reasons for reduction in *** the cross-sectional shape of the draft tube was changed,the vorticity was distributed from the center of the vortex rope to all parts of the cross-sectional draft tube,with extreme values at the center and at the *** vortex stretching and dilatation terms played a major role in the change in vorticity,with the baroclinic torque having an effect at the center of the vortex rope,this study is helpful to understand the flow of water in the draft tube and guide the design and optimization of the draft tube in engineering application.

关键词： cavitation vortex rope vorticity transport equation vortex line draft tube

Updating Strategy of Campus Space Based on Multi-source Data:A Case Study of West Campus of Yangtze University

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Journal of Landscape Research 2022年第4期14卷 5-10页

作者： ZHOU Jin GUO Xiaohua zeng junfeng SONG Yingying WANG Liangfei WANG Cong College of Horticulture and Gardening Yangtze UniversityJingzhouHubei 434000China

Under the macro background of rapid urbanization and social transformation in China,campus space renewal has become an important practice and carrier for the sustainable development of *** study on campus space by big data and quantitative reflection of spatial distribution of applicable people in different areas of the campus can provide a certain scientific basis for campus space *** campus of Yangtze University is taken as research *** on cognitive map method,questionnaire survey method,behavior trajectory and correlation analysis method,the types and characteristics of campus space composition,campus satisfaction,usage and its relevance are *** results show that ①the overall imageability of campus space is higher,which has a significantly positive correlation with the satisfaction of campus environment,and has no correlation with users’ behavior *** use frequency of non teaching areas varies greatly in different periods of time.②The correlation between the surrounding green vegetation and the image degree of campus landmarks is the most significant,and the coefficient is 0.886.③The correlation between spatial size suitability and regional image degree is the most significant,and the coefficient is 0.937.④The correlation between public activity facilities in the region and node image degree is the most significant,and the coefficient is *** to the research results,the corresponding solutions are put forward to provide scientific and quantitative reference suggestions for the renewal and transformation of the campus.

关键词： Image space analysis Campus renewal Correlation analysis method GPS Behavioral spatiotemporal data

Rapid characterization of non-volatile phenolic compounds reveals the reliable chemical markers for authentication of traditional Chinese medicine Xiang-ru among confusing Elsholtzia species

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Chinese Journal of Natural Medicines 2024年第4期22卷 375-384页

作者： zeng Zhen ZHANG Chen HU Jiadong WANG Feiyan WU Ziding WANG Jing ZHANG Jun YANG Shuda CHEN junfeng LI Mingming TONG Qi QIU Shi CHEN Wansheng The SATCM Key Laboratory for New Resources&Quality Evaluation of Chinese Medicine Institute of Chinese Materia MedicaShanghai University of Traditional Chinese MedicineShanghai 201203China Department of Pharmacy Second Affiliated Hospital of Navy Medical UniversityShanghai 200003China Kunming Plant Classification Biotechnology Co. Ltd.Kunming 650500China School of Pharmaceutical Sciences and Yunnan Key Laboratory of Pharmacology for Natural Products Kunming Medical UniversityKunming 650500China State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs Beijing100700China

The aerial parts of Mosla chinensis *** Mosla chinensis cv.'Jiangxiangru'(MCJ)are widely utilized in traditional Chinese medicine(TCM),known collectively as ***,due to clinical effectiveness concerns and frequent misidentification,the original plants have increasingly been substituted by various species within the genera Elsholtzia and *** challenge in distinguishing between these genera arises from their similar morphological and metabolic *** address this issue,our study introduced a rapid method for metabolic characterization,employing high-resolution mass spectrometry-based *** detailed biosynthetic and chemometric analyses,we pinpointed five phenolic compounds—salviaflaside,cynaroside,scutellarein-7-O-D-glucoside,rutin,and vicenin-2—among 203 identified compounds,as reliable chemical markers for distinguishing Xiang-ru from closely related Elsholtzia *** methodology holds promise for broad application in the analysis of plant aerial parts,especially in verifying the authenticity of aromatic traditional medicinal *** findings underscore the importance of non-volatile compounds as dependable chemical markers in the authentication process of aromatic traditional medicinal plants.

关键词： Genus Elsholtzia Genus Mosla Traditional Chinese medicine Xiang-ru Non-volatile phenolic compounds Liquid chromatography-mass spectrometry

Research on the Reconstruction and Renewal of the Landscape Space of Industrial Sites in Post-industrial Era:A Case Study of Guangzhou Zilintang Art Town

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Journal of Landscape Research 2021年第3期13卷 25-28页

作者： GAO Qing zeng junfeng College of Horticulture and Gardening Yangtze UniversityJingzhouHubei 434025China

With the rapid development of urbanization,traditional old industrial areas can not cope with the impact of the new wave of urbanization and have been abandoned,demolished and *** the pollution problem of industrial wasteland has become an important part of urban renewal *** on the development of industrial sites,the paper discusses the design principles and methods of industrial *** the case analysis of the industrial site of Guangzhou Zilintang Art Town,the paper excavates the deep cultural deposits in the post-industrial era and analyzes the renewal,utilization,transformation and regeneration of the landscape space of industrial sites.

关键词： Industrial site Landscape design Space transformation Renewal and utilization

Trajectory optimization and applications using high performance solar sails

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Theoretical & Applied Mechanics Letters 2011年第3期1卷 1-7页

作者： Xiangyuan zeng,~(a)) junfeng Li,~(b)) Hexi Baoyin,and Shengping Gong School of Aerospace,Tsinghua University,Beijing 100084,China School of Aerospace Tsinghua University Beijing 100084 China

The high performance solar sail can enable fast missions to the outer solar system and produce exotic non-Keplerian *** there is no fuel consumption,mission trajectories for solar sail spacecraft are typically optimized with respect to flight *** investigations focused on interstellar probe missions have been made,including optimal methods and new objective functions. Two modes of interstellar mission trajectories,namely 'direct flyby' and 'angular momentum reversal trajectory',are compared and *** a foundation,a 3D non-dimensional dynamic model for an ideal plane solar sail is introduced as well as an optimal control framework.A newly found periodic double angular momentum reversal trajectory is presented,and some properties and potential applications of this kind of inverse orbits are *** method how to achieve the minimum periodic inverse orbit is also briefly elucidated.

关键词： solar sail non-Keplerian orbit angular momentum reversal time optimal control