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Spanning tree-based algorithm for hydraulic simulation of large-scale water supply networks

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Water Science and Engineering 2010年第1期3卷 23-35页

作者： Huan-feng duan Guo-ping YU Department of Civil and Environmental Engineering Hong Kong University of Science and Technology Hong Kong P.. R. China College of Environmental Science and Engineering Tongji University Shanghai 200092 P. R. China

With the purpose of making calculation more efficient in practical hydraulic simulations, an improved algorithm was proposed and was applied in the practical water distribution field. This methodology was developed by expanding the traditional loop-equation theory through utilization of the advantages of the graph theory in efficiency. The utilization of the spanning tree technique from graph theory makes the proposed algorithm efficient in calculation and simple to use for computer coding. The algorithms for topological generation and practical implementations are presented in detail in this paper. Through the application to a practical urban system, the consumption of the CPU time and computation memory were decreased while the accuracy was greatly enhanced compared with the present existing methods.

关键词： large-scale networks, hydraulic simulation graph theory fundamental loop spanning tree efficiency

石墨烯/高分子复合材料研究进展的可视化分析

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石油化工 2024年第1期53卷 130-138页

作者：李昕阳杨宁刘昌段晓芳黄巍王丽静中石化(北京)化工研究院有限公司北京100013

为了解石墨烯/高分子复合材料研究领域的研究现状,利用CiteSpace软件对2004—2023年期间该领域的文献进行可视化分析,通过主题检索构建数据集,从时间分布、国家合作、机构合作及文献共被引分析该研究领域的发展情况。石墨烯/高分子复合... 详细信息

为了解石墨烯/高分子复合材料研究领域的研究现状,利用CiteSpace软件对2004—2023年期间该领域的文献进行可视化分析,通过主题检索构建数据集,从时间分布、国家合作、机构合作及文献共被引分析该研究领域的发展情况。石墨烯/高分子复合材料领域研究活跃,中国、美国、印度为主要研究力量,中国的发文数占所有国家发文数的45%;电磁干扰、热导率及石墨烯纳米片是该领域的三个主要聚类,近期的研究热点为石墨烯/高分子复合材料用于电磁干扰,掺入石墨烯的高分子材料具有高电磁屏蔽效率。突变性分析结果表明,近期该领域的研究趋势为石墨烯增强复合材料,在低添加量下,石墨烯对复合材料力学性能的增强效果显著。

关键词：石墨烯/高分子复合材料可视化分析 CiteSpace软件

母代运动抵抗高脂饮食导致子代小鼠骨骼肌功能障碍的机制研究

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体育科学 2024年第2期44卷 50-62页

作者：石海旺李婕于浩洋张福龙杨罗丹段锐华南师范大学体育科学学院广东广州510006

目的:探究母代运动对子代小鼠长期高脂饮食导致骨骼肌功能障碍的保护效应及其机制。方法:雌性C57BL/6小鼠随机分为对照组(maternal control,M-Con)和运动组(maternal exercise,M-Ex)。M-Ex组小鼠孕前4周及孕期进行跑台运动;M-Con组在孕... 详细信息

目的:探究母代运动对子代小鼠长期高脂饮食导致骨骼肌功能障碍的保护效应及其机制。方法:雌性C57BL/6小鼠随机分为对照组(maternal control,M-Con)和运动组(maternal exercise,M-Ex)。M-Ex组小鼠孕前4周及孕期进行跑台运动;M-Con组在孕前及孕期均维持常规生活方式,在M-EX组小鼠训练时置于相同环境。M-Con组和M-Ex组与同龄野生型C57BL/6雄性小鼠交配后获得子代小鼠,子代小鼠正常饲养至3周龄后进行为期12周的高脂饮食(high-fat diet,HFD)干预。通过运动表现检测子代小鼠骨骼肌功能;利用组织化学染色分析子代小鼠骨骼肌纤维横截面积、脂质沉积、纤维化和纤维类型;利用蛋白质印迹(Western blot)检测子代小鼠骨骼肌mTOR、P70s6k、Fbx32、TNF-α、TNFR1、AMPK和PGC-1α的蛋白质表达水平;利用实时荧光定量PCR(RT-PCR)检测脂质合成相关基因和线粒体生物发生相关基因表达水平。结果:与正常饲养的野生型小鼠(Sham)相比,M-Con组子代小鼠(***)长期高脂饮食后,运动表现显著下降,骨骼肌肌指数和纤维横截面积显著降低,骨骼肌脂质合成相关基因表达显著升高,骨骼肌异位脂质沉积与纤维化面积显著增加,血浆TNF-α水平显著升高,骨骼肌TNF-α及TNFR1蛋白表达显著上调,骨骼肌线粒体功能障碍,琥珀酸脱氢酶染色阳性纤维数量显著降低,AMPK、PGC-1α蛋白表达显著降低。与***组相比,M-Ex组子代小鼠(***)骨骼肌AMPK、PGC-1α蛋白表达水平显著升高,线粒体生物发生相关基因表达及琥珀酸脱氢酶染色阳性纤维数量显著增加,脂质合成相关基因及TNF-α和TNFR1蛋白表达水平显著下调,脂质沉积和纤维化面积显著降低,有效抵抗长期高脂饮食导致的骨骼肌功能障碍。结论:母代运动通过激活子代小鼠骨骼肌AMPK-PGC-1α信号通路,促进骨骼肌线粒体生物发生,降低子代小鼠长期高脂饮食导致的肥胖和骨骼肌脂质异位沉积,并抑制循环系统TNF-α水平和骨骼肌TNFR1的蛋白表达,有效缓解子代小鼠肌萎缩和骨骼肌纤维化的发生,保护子代小鼠骨骼肌免受高脂饮食导致的功能障碍。

关键词：母代运动运动表现肥胖高脂饮食腺苷酸活化蛋白激酶肿瘤坏死因子

Observations of kinetic Alfvén waves by THEMIS near a substorm onset

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Chinese Science Bulletin 2012年第12期57卷 1429-1435页

作者： duan SuPing LIU ZhenXing ANGELOPOULOS Vassilis State Key Laboratory of Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100190 China Institute of Geophysics and Planetary Physics University of California Los Angeles California 90095 USA

Low frequency electromagnetic fluctuations in the vicinity of a magnetospheric substorm onset were investigated using simultaneous observations by THEMIS multiple probes in the near-Earth plasma sheet in the *** observations indicate that in the vicinity of a substorm onset,kinetic Alfvén waves can be excited in the high-βplasma sheet(β=2μ0nT/B 2 ,the ratio of plasma thermal pressure to magnetic pressure)within the near-Earth *** kinetic Alfvén wave has a small spatial scale in the high-β*** parallel electric field accompanying kinetic Alfvén waves accelerates the charged particles along the magnetic *** kinetic Alfvén waves play an important role in the substorm trigger process,and possibly in the formation of a substorm current wedge.

关键词：阿尔文波动力学暴发病观测等离子体片亚暴电流楔地球磁尾空间尺度

Effects of minor Sr addition on as-cast microstructure and mechanical properties of a Mg-3Sn-2Ca(wt.%) magnesium alloy

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China Foundry 2014年第2期11卷 108-114页

作者： Yang Mingbo Li Hongliang duan Chengyu School of Materials Science & Engineering Chongqing University of Technology Key Laboratory of Manufacture and Test Techniques for Automobile Parts Ministry of EducationChongqing University of Technology

Minor Sr was introduced to the Mg-3Sn-2Ca （wt.%） alloy in this paper, and the effects of minor Sr addition on the as-cast microstructure and mechanical properties of the Mg-3Sn-2Ca （wt.%） alloy were investigated by using of optical and electron microscopies, differential scanning calorimetry （DSC） analysis, and tensile and creep tests. The results indicate that, after adding 0.034wt.%, 0.065wt.% or 0.10wt.% Sr to the Mg- 3Sn-2Ca alloy, the morphology of the primary CaMgSn phase changes from the initial coarse needle-like net to relatively fine short block and/or particle-like shapes. At the same time, the additions of 0.034wt.% or 0.065wt.% Sr suppress the formation of the primary CaMgSn phase, and the addition of 0.10wt.% Sr not only suppresses the formation of the primary and eutectic CaMgSn phases but also promotes the formation of Mg2Ca phase. Furthermore, the addition of minor Sr to the Mg-3Sn-2Ca alloy can improve the tensile properties of the alloy both at room temperature and 150 ℃. The creep property of the Mg-3Sn-2Ca alloy at 150 ~C is also improved by the additions of 0.034wt.% and 0.065wt.% Sr; however, the addition of 0.10wt.% Sr is not beneficial to the creep properties of the Mg-3Sn-2Ca alloy.

关键词： magnesium alloys Mg-Sn-Ca alloys CaMgSn phase Sr addition

Mitochondrial aberrations in systemic lupus erythematosus pathogenesis:Insights and therapeutic implications

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Rheumatology & Autoimmunity 2024年第2期4卷 69-80页

作者： Haoguang Li Lu Zhou Wei Zhou Xiuling Zhang Jingjing Shang Xueqin Feng Le Yu Jie Fan Jie Ren Rongwei Zhang Xinwang duan Department of Rheumatology and Immunology The Second Affiliated Hospital of Nanchang UniversityNanchangChina

Systemic lupus erythematosus(SLE),a chronic autoimmune disease,is marked by impaired immune tolerance and heightened activity in both innate and adaptive immune *** of SLE include elevated type I interferons and autoantibody production,though the exact causes of SLE remain elusive despite advances in research *** to SLE research is understanding its pathogenesis and developing effective diagnostic and therapeutic *** studies have highlighted a significant link between mitochondrial abnormalities and SLE's development and *** dysfunction plays a key role in SLE pathogenesis through various mechanisms such as mitochondrial DNA mutations,oxidative stress,immune metabolic reprogramming,and cellular *** factors collectively contribute to the loss of self-tolerance,increased autoantibody production,and impaired clearance of immune complexes,leading to their *** triggers sustained inflammatory responses and damages multiple *** review focuses on the diagnostic and therapeutic approaches related to mitochondrial abnormalities in *** mitochondrial pathways presents a promising strategy for treating SLE,potentially improving prognosis and quality of life for those *** research should further investigate the role of mitochondria in the onset and progression of SLE,providing new avenues for understanding and managing this complex disease.

关键词： mitochondrial dysfunctions mitophagy oxidative stress systemic lupus erythematosus therapeutic potential

Characterization of a collection of Chinese fir elite genotypes using *** amplified polymorphism markers

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Journal of Forestry Research 2016年第5期27卷 1105-1110页

作者： Hongjing duan Dehuo Hu Yun Li Huiquan Zheng National Engineering Laboratory for Tree Breeding Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants Ministry of Education College of Biological Sciences and Technology Beijing Forestry University Beijing 100083 People's Republic of China Guangdong Provincial Key Laboratory of Bio-control for the Forest Disease and Pest Guangdong Academy of ForestryGuangzhou 510520 People's Republic of China

Chinese fir [Cunninghamia lanceolata （Lamb.） Hook] is a major timber tree species in China. In the pre- sent study, sequence-related amplified polymorphism （SRAP） markers were used to evaluate the polymorphisms, diversity, and relationships in a collection of Chinese fir elite genotypes （n = 103） from the Lechang provenance, an endangered provenance. Thirty-five SRAP primer combinations produced 620 bands among the tested 103 Lechang provenance genotypes and 17 nonSLechang provenance genotypes; 577 （93.1%） of these were polymorphic, yielding an average of 16.5 polymorphic bands per primer combination. Of the SRAP primer combinations （n = 35）, I4 ones identified 〉70.0 % of the 120 genotypes. The Mel2-Eml9 combination had the strongest discriminatory ability with 93.3 % of the genotypes iden- tified. An UPGMA dendrogram further showed that most of the Lechang provenance genotypes （87.4 %） grouped together （Cluster A）. The Lechang genotypes had a con- siderable amount of genetic variation with genetic simi- larity from 0.40 to 0.81. The current work may facilitate the management of the endangered Lechang Chinese fir provenance.

关键词： Chinese fir SRAP Germplasm Geneticvariation - Dendrogram

Microphysical Properties of Rainwater in Typhoon Usagi(2013):A Numerical Modeling Study

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Advances in Atmospheric Sciences 2019年第5期36卷 510-526页

作者： Lin DENG Wenhua GAO Yihong duan Yuqing WANG Nanjing University of Information Science and Technology State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences International Pacific Research Center and Department of Atmospheric Sciences School of Ocean and Earth Science and Technology University of Hawai'i at Mānoa

A 2-km resolution simulation using the Weather Research and Forecasting model with Morrison microphysics was employed to investigate the rainwater microphysical properties during different stages of Typhoon Usagi(2013) in the inner-core and outer region. The model reproduced the track, intensity, and overall structure of Usagi(2013) reasonably. The simulated raindrop size distribution showed a rapid increase in small-size raindrop concentration but an oscillated decrease in large-size ones in the inner-core region, corresponding well with the upward motion. It was found that there existed two levels(1.25 and 5.25 km) of maximum number concentration of raindrops. The ice-related microphysics at high levels was stronger than the warm-rain processes at low levels. The larger raindrops formed by self-collection in the inner-core suffered from significant breakup, but the raindrops outside the eyewall did not experience evident breakup. Model results indicated that the dominant terms in the water vapor budget were the horizontal moisture flux convergence(HFC) and local condensation and deposition. The evaporation from the ocean surface(PBL) was ~10% of the HFC in the inner core, but up to 40% in the outer region as the air therein was far from saturation. Furthermore, water vapor in the outer region was obtained equally through evaporation from the cloud and inward transportation from the environment. An earlier start of cloud microphysical processes in the inner-core region was evident during the intensification stage, and the continuous decreasing of condensation in both the inner-core and outer regions might imply the beginning of the storm weakening.

关键词： raindrops microphysical properties typhoon simulation

Elucidate long-term changes of ozone in Shanghai based on an integrated machine learning method

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Frontiers of Environmental Science & Engineering 2023年第11期17卷 223-238页

作者： Jin Xue Fangting Wang Kun Zhang Hehe Zhai Dan Jin Yusen duan Elly Yaluk Yangjun Wang Ling Huang Yuewu Li Thomas lei Qingyan Fu Joshua S.Fu Li Li School of Environmental and Chemical Engineering Shanghai UniversityShanghai 200444China Key Laboratory of Organic Compound Pollution Control Engineering(MOE) Shanghai UniversityShanghai 200444China Shanghai Environmental Monitoring Center Shanghai 200235China Institute of Science and Environment University of Saint JosephMacao 999078China Department of Civil and Environmental Engineering University of TennesseeKnoxvilleTN 37996USA

Surface ozone(O_(3))is influenced by regional background and local photochemical formation under favorable meteorological *** the contribution of these factors to changes in O_(3)is crucial to address the issue of O_(3)*** this study,we propose a novel integrated method that combines random forest,principal component analysis,and Shapley additive explanations to distinguish observed O_(3)into meteorologically affected ozone(O_(3_MET)),chemically formed from local emissions(O_(3_LC)),and regional background ozone(O_(3_RBG)).Applied to three typical stations in Shanghai during the warm season from 2013 to 2021,the results indicate that O_(3_RBG)in Shanghai was 48.8±0.3 ppb,accounting for 79.6%–89.4%at different sites,with an overall declining trend of 0.018 ppb/yr.O_(3_LC)at urban and regional sites ranged from 5.9–9.0 ppb and 8.9–14.6 ppb,respectively,which were significantly higher than the contributions of 2.5–7.4 ppb at an upwind background site.O_(3_MET)can be categorized into those affecting O_(3)photochemical generation and those changing O_(3)dispersion conditions,with absolute contributions to O_(3)ranging from 13.4–19.0 ppb and 13.1–13.7 ppb,*** found that the O_(3)rebound in 2017,compared to 2013,was primarily influenced by unfavorable O_(3)dispersion conditions and unbalanced emission reductions;while the O_(3)decline in 2021,compared to 2017,was primarily influenced by overall favorable meteorological conditions and further emissions *** findings highlight the challenge of understanding O_(3)change due to meteorology and regional background,emphasizing the need for systematic interpretation of the different components of O_(3).

关键词： Ozone Integrated method Machine learning