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大连足球后备人才培养的现状与对策

西安体育学院学报 2009年第3期26卷 270-273,298页

作者：孙华清大连大学体育学院辽宁大连116622

"举国体制"使大连足球后备人才层出不穷,将大连足球推向历史上最辉煌的顶点。随着职业联赛的兴起,由于在训练体制中的相关法律法规不健全,缺乏人才培养的激励机制等因素,导致大连足球后备人才出现了萎缩。研究提出了完善大连足球后备人... 详细信息

"举国体制"使大连足球后备人才层出不穷,将大连足球推向历史上最辉煌的顶点。随着职业联赛的兴起,由于在训练体制中的相关法律法规不健全,缺乏人才培养的激励机制等因素,导致大连足球后备人才出现了萎缩。研究提出了完善大连足球后备人才培养的对策与建议。

关键词：大连足球后备人才培养对策

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足球后备人才培养面临的问题及对策思考

成都体育学院学报 2009年第2期35卷 63-65页

作者：孙华清大连大学体育学院辽宁大连116622

足球后备人才培养实现可持续发展是一项宏观的系统工程。在这一宏观工程中,后备人才资源的规模,是其能否实现可持续发展的关键环节。目前,在我国足球后备人才培养的发展中,尚存在诸多非持续性发展因素的制约。拟对足球后备人才培养可持... 详细信息

足球后备人才培养实现可持续发展是一项宏观的系统工程。在这一宏观工程中,后备人才资源的规模,是其能否实现可持续发展的关键环节。目前,在我国足球后备人才培养的发展中,尚存在诸多非持续性发展因素的制约。拟对足球后备人才培养可持续发展的影响因素进行分析并提出相应对策。

关键词：人才培养持续发展影响因素对策

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奇异线性离散哈密顿系统极限点型的判定

山东大学学报（理学版） 2010年第3期45卷 76-79页

作者：孙华清山东大学威海分校数学与统计学院山东威海264209

考虑一类奇异线性离散Hamilton系统,建立了利用系统权函数与系数表示的两个极限点型的判别准则。

关键词： Hamilton系统极限点型亏指数

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大连足球沉浮之我见

体育学刊 2009年第5期16卷 37-40页

作者：孙华清大连大学体育学院辽宁大连116622

通过对大连足球8次夺得中国足球职业联赛桂冠的回顾,以及1999年以来成绩大幅波动的反思,认为大连足球沉浮因素包括:职业联赛体制滞后,导致俱乐部经营不利;过度依附政府,导致俱乐部难以独立运作;俱乐部经营不善,导致人才流失;政府投入减... 详细信息

通过对大连足球8次夺得中国足球职业联赛桂冠的回顾,以及1999年以来成绩大幅波动的反思,认为大连足球沉浮因素包括:职业联赛体制滞后,导致俱乐部经营不利;过度依附政府,导致俱乐部难以独立运作;俱乐部经营不善,导致人才流失;政府投入减少,导致后备人才培养艰难;国家队战绩不佳,导致足球大环境衰退。中国足球的体制、环境、领导者,主导着大连足球的波峰和波谷,也主导着中国足球的发展。

关键词：足球职业联赛大连足球中国

Role of ferroptosis in fibrosis:From mechanism to potential therapy

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Chinese Medical Journal 2024年第7期137卷 806-817页

作者： Xuemeng Qiu qing Bi Jiyue Wu Zejia sun Wei Wang Department of Urology Beijing Chao-Yang HospitalCapital Medical UniversityBeijing 100020China Department of Surgery Third Clinical Medical CollegeCapital Medical UniversityBeijing 100020China Urinary and Nephropathy Center Beijing Chao-Yang HospitalCapital Medical UniversityBeijing 100020China Institute of Urology Capital Medical UniversityBeijing 100020China

Fibrosis,which is a manifestation of the physiological response to injury characterized by excessive accumulation of extracellular matrix components,is a ubiquitous outcome of the repair ***,in cases of repetitive or severe injury,fibrosis may become dysregulated,leading to a pathological state and organ *** recent years,a novel form of regulated cell death,referred to as ferroptosis,has been identified as a possible contributor to fibrosis;it is characterized by iron-mediated lipid *** has garnered attention due to the growing body of evidence linking ferroptosis and fibrogenesis,which is believed to be driven by underlying inflammation and immune *** the increasing interest in the relationship between ferroptosis and fibrosis,a comprehensive understanding of the precise role that ferroptosis plays in the formation of fibrotic tissue remains *** review seeks to synthesize previous research related to the *** categorized the different direct and indirect mechanisms by which ferroptosis may contribute to fibrosis into three categories:(1)iron overload toxicity;(2)ferroptosis-evoked necroinflammation,with a focus on ferroptosis and macrophage interplay;and(3)ferroptosis-associated pro-fibrotic factors and ***,the review considers the potential implications of these findings and highlights the utilization of ferroptosis-targeted therapies as a promising strategy for mitigating the progression of *** conclusion,novel anti-fibrotic treatments targeting ferroptosis could be an effective treatment for fibrosis.

关键词： Ferroptosis Fibrosis Anti-fibrotic Iron metabolism Necroinflammation Epithelial-mesenchymal transition

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大连市开展“全民健身”活动的研究

武汉体育学院学报 2009年第4期43卷 91-95页

作者：孙华清大连大学体育学院辽宁大连116622

总结大连市开展全民健身活动的历史,分析大连市开展全民健身活动的地区特点、时代特点与发展优势并进行国内外同类城市的横向比较;通过对部分市民开展全民健身活动行为的问卷调查了解大连市开展全民健身活动出现的问题藉此提出大连市"... 详细信息

总结大连市开展全民健身活动的历史,分析大连市开展全民健身活动的地区特点、时代特点与发展优势并进行国内外同类城市的横向比较;通过对部分市民开展全民健身活动行为的问卷调查了解大连市开展全民健身活动出现的问题藉此提出大连市"全民健身"活动的战略选择及对策。

关键词：大连市小康社会全民健身战略选择对策

Evaluation of lightning-induced overvoltage on a 10 kV distribution line based on electromagnetic return-stroke model using finite-difference time-domain

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High Voltage 2024年第2期9卷 356-366页

作者： Pan Duan Lianfang Zhang Xiaogang huang Jian sun Yue Qi qing Yang School of Automation Chongqing University of Posts and TelecommunicationsChongqingChina Chongqing Power Co Tongnan BurChongqingChina China Southern Power Grid Science Research Institute GuangzhouChina State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina

Accurate simulation of lightning-induced overvoltage for overhead distribution lines is helpful to prevent lightning trip *** electromagnetic return-stroke model was used to represent lightning and then a 3D finite-difference time-domain(FDTD)method was adopted to simulate the lightning-induced overvoltage on a distribution line without a field-line coupling *** lightning-induced overvoltage behave for different ground conductivity and varying distance between the distribution line and the lightning channel was *** results showed that the overvoltage waveforms at the centre point of the line corresponding to lightning strikes on the lossy ground and an ideal ground(σ=∞)were similar;however,the peak amplitudes of the waveform were affected by soil conductivity at a close *** relationship between magnitude of the overvoltage and distance can be described by a second-order exponential decay ***,the overvoltage calculated using the proposed model was compared with those obtained based on Agrawal's model and measurements made using the newly developed intelligent insulator on *** these comparisons,it could be concluded that the FDTD method with the electromagnetic return-stroke model produces reasonably accurate results of the attenuated oscillation waveform,which can better reproduce the overvoltage on operational distribution lines.

关键词： lightning distribution return

Microphysical Insights into a Tornadic Supercell from Dual-Polarization Radar Observations in Jiangsu, China on 14 May 2021

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Journal of Meteorological Research 2024年第2期38卷 303-320页

作者： Chao YUAN Yang BAI Pengfei sun hua BAI Lu XIA China Meteorological Administration Tornado Key Laboratory Foshan 528315 Institute of Atmospheric Environment China Meteorological AdministrationShenyang 110166 Panjin National Climate Observatory Panjin 124010 Yangzhou Meteorological Bureau of Jiangsu Province Yangzhou 225100 Yichun Meteorological Bureau of Heilongjiang Province Yichun 153000

Tornadoes are incredibly powerful and destructive natural events,yet the microphysical characteristics of the parent storm and its effects on tornadogenesis remain *** study analyzed polarization radar data of a tornadic supercell that occurred in Jiangsu Province of China on 14 May 2021,in comparison with another tornadic supercell and two non-tornadic supercells that occurred in the same region in *** two tornadic supercells exhibited lower differential reflectivity(ZDR)in the hook echo region compared with the non-tornadic supercells,indicating smaller median drop sizes.A distinct increase in ZDR from the melting of frozen hydrometeors,observed between2.5-and 4.0-km altitude in the non-tornadic storms,was absent in the tornadic *** non-tornadic supercells also displayed substantially higher specific differential phase(KDP)below the melting level,likely aroused from enhanced melting and *** findings suggest fundamental microphysical contrasts between tornadic and nontornadic ***,tornadic supercells have smaller droplets and may reduce melting in hook ***,greater separation between the ZDR arc and the KDP foot was observed during *** vertical gradient of KDP related to the cooling pool strength of the hook echo,regulating rear-flank downdraft *** the limited number of cases investigated,the findings of this study indicate that monitoring ZDR,KDP,and drop size distribution trends could assist with tornado prediction and warnings.

关键词： tornado polarimetric radar supercell hook echo drop size distribution

Accurate characterization of bubble mixing uniformity in a circular region using computational geometric theory

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Particuology 2024年第3期86卷 149-159页

作者： Hui sun Jianxin Xu Shibo Wang Guangcheng Cai hua Wang Wuliang Yin State Key Laboratory ofComplex Nonferrous Metal Resources Clean Utilization Kunming University ofScience and TechnologyKunming650093China bFaulty of Metallurgical and Energy Engineering Kunming University ofScience and TechnologyKunming650093China Faculty of Science Kunming University ofScience and TechnologyKunming650500China Department of Elec.and Electronic Engineering.University of Manchester ManchesterM139PL UK

The present study proposes a novel method based on the geometric theory for measuring the distribution of bubble swarms in the circular region of a direct-contact heat *** was determined that the mixing is uniform when the average distance between the bubble swarms in the unit circular region is approximately 0.9054,which is the standard reference *** effect of sample size(i.e.,the number of bubbles)on mixing uniformity was investigated to determine the optimal sample *** was verified that the metric's accuracy and stability were higher with a sample size of ***,it was proposed to increase the sample size by filling irregular bubbles using a segmentation method,which enabled a further accurate assessment of the mixing *** mixing uniformity of bubble swarms in the circular region and its maximum internal connection with the square region was accurately *** was revealed that the relative average error increased by approximately 3.47% due to information *** proposed method was demonstrated to be rotationally *** present study provided novel insights into evaluating mixing uniformity,which would guide enhanced heat transfer and the effective evaluation of the spatiotemporal characteristics of transient mixing in circular regions or the cross-sections of chemical transport pipelines.

关键词： Direct-contact heat exchanger Circular region Bubble swarm Distribution uniformity AD-Circle method