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Electromagnetic anisotropic homogeneous model for eddy-current field in single-phase wound core

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High Voltage 2024年第1期9卷 172-181页

作者： Lijun Zhou Woyang Li Yingyi Xia Jiawei Chen Chenqingyu Zhang xiaohu cai Lei Guo Dongyang Wang School of Electrical Engineering Southwest Jiaotong UniversityChengduChina

The analysis of the eddy-current field in the wound core widely used in the field of transformer energy conservation is taken as the *** the homogenisation idea to consider the unique geometry of the wound core and features of its equivalent multi-stage circular cross-section magnetic boundary,a homogeneous model consisting of a columnar material with continuous homogeneous electromagnetic anisotropy is established by deriving the Maxwell equations of the magnetic quasi-static field in the columnar coordinate ***,a homogeneous fine element model for the eddycurrent field in the wound core is established and the accuracy of the model has been verified by the test *** result shows that the homogeneous model can be effectively used for the analysis of the eddy-current field in the wound core,and the error of calculating the eddy-current loss under different excitation conditions is less than 6%under the premise of extremely saving the engineering calculation cost,which will help improve the operational performance of the wound core and contribute to the energysaving goal of the high-voltage equipment.

关键词： anisotropic coordinate excitation

Soil Microbial Population Dynamics along a Chronosequence of Moist Evergreen Broad-leaved Forest Succession in Southwestern China

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Journal of Mountain Science 2010年第4期7卷 327-338页

作者： ZHU Wanze cai xiaohu LIU Xingliang WANG Jinxi CHENG Song ZHANG Xiuyan LI Dengyu LI Maihe Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China Sichuan Academy of Forestry Chengdu 610081 China Siehuan Agricultural University Yaan 625014 China Swiss Federal Research Institute WSL Zuereherstrasse 111 CH-8903 Birrnensdorf Switzerland

Little is known about whether soil microbial population dynamics are correlated with forest *** test the hypotheses that(1) soil microbial composition changes over successional stages,and(2) soil microbial diversity is positively correlated with plant species diversity,we determined the soil microbial populations,community composition,and microflora diversity in evergreen broad-leaved forests along a chronosequence of vegetation succession from 5 to 300 years in southwestern *** soil microbial community was mainly composed of bacteria(87.1-98.7% of the total microorganisms and 10 genera identified),fungi(0.3-4.0%,7 genera),and actinomycetes(2.1-9.1%,8 species and 1 genus).There were significant differences in soil microbial populations among different successional stages and within the four *** seasonal variations of the soil microbial community may be associated with the seasonal changes in environmental *** changes in soil microbial diversity(Shannon-Wiener index) with successional time followed one-humped,convex curves peaked at-100 years since restoration,which is identical with the trends of the aboveground plant *** plant diversity resulting in enhanced nutrient flow and root exudation may contribute to positive relationships between the soil microbial diversity and plant ***,decreases in soil microbial diversity in the late-successional stages appear to be related to the net loss in species richness that occurs after 100 years since *** findings confirm the intermediate disturbance hypothesis that suggests diversity peaks at midsuccessional stages.

关键词： Actinomycetes Bacteria Fungi Microbial diversity Moist evergreen broad-leavedforest Seasonal dynamics

钱塘江下游滨江地区地下水水化学特征与水质评价

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人民长江 2023年第6期54卷 27-33页

作者：蔡小虎康丛轩中国地质调查局南京地质调查中心江苏南京210016

为探究钱塘江下游滨江地区地下水水化学特征及水质情况,采用数理统计、Piper三线图、Gibbs图、单指标评价法、综合质量评价法和模糊综合评价法,对研究区的46组地下水水样测试数据进行分析。结果表明:研究区内潜水水化学类型主要为HCO_(3... 详细信息

为探究钱塘江下游滨江地区地下水水化学特征及水质情况,采用数理统计、Piper三线图、Gibbs图、单指标评价法、综合质量评价法和模糊综合评价法,对研究区的46组地下水水样测试数据进行分析。结果表明:研究区内潜水水化学类型主要为HCO_(3)-Na·Ca·Mg型和HCO_(3)·Cl-Na型,水化学成分受岩石风化作用影响显著,主要受到岩盐的溶解、离子交换作用、人类活动影响;承压水水化学类型主要为Cl-Na·Ca·Mg型和Cl-Na型,水化学成分主要受海水作用的影响;研究区内潜水水质总体较好,部分潜水受原生地质环境的污染;承压水污染主要受海侵影响,不宜饮用。研究结果对区内地下水的开发、利用和保护具有积极的指导意义。

关键词：地下水水化学特征水质评价 Piper三线图钱塘江

Biomass and Nutrient Accumulation Characteristics of Young Stands of Alnus cremastogyne

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Agricultural Biotechnology 2018年第1期7卷 50-54页

作者： Anmin MIN Yong WANG Xingliang LIU Yu WANG Li WANG Hongxia LI xiaohu cai Yongming AN Sichuan Academy of Forestry Science Chengdu 610081 China Aba Prefecture bureau of Forestry Maerkang 624000 China Institute of Scenery Garden Management of Urban and Rural Planning Construction and Housing Security Bureau in Zitong County Zitong 622150 China

To investigate plant biomass and nutrient distribution and accumulation in organs of Alnus cremastogyne at different ages from 1 to 4 years, the biomass, N, P, K, Ca, Mg, Fe and Zn were tested. The results showed that the average biomass of the whole tree and the biomass of leaf, branch, stem, and root were in positive correlation with tree age, but the growth rate of biomass had a decreasing trend with the tree age increasing, and only the biomass proportion of the trunk in the whole individual plant showed an increasing trend with age. The contents of nutrient elements in organs showed an order of N 〉 Ca 〉 K 〉 Mg 〉 P 〉 Fe 〉 Zn ; and the contents of N, P and K were higher in the leaf than in other organs, and the contents of Ca, Mg and Fe in the root were higher than in other organs. The accumulations of N, P, K, Ca, Mg and Zn were the highest in the trunk, and that of Fe was the highest in the root. The annual net accumulations of N, P, K, Ca and Mg in the average trees from 1 to 4 years old were 17.07, 40.79, 95.82 and 106.71 g, respectively, and the annual net accumulations of microelements （Fe and Zn） were 335.04, 577.26, 1267 and 1525.27 mg, respectively.

关键词： Alnus cremastogyne Forest stands at different ages Demands for nutrient elements Biomass Nutrient elements

媒体融合背景下科技期刊网站建设问题分析与对策建议

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中国科技期刊研究 2021年第4期32卷 501-508页

作者：刘天浩蔡小虎四川省林学会四川省林业科学研究院《四川林业科技》编辑部四川省成都市610081

【目的】找出我国林业类科技期刊网站建设在媒体融合背景下所存在的问题,为提升我国科技期刊网站建设水平提供参考,助力期刊数字化转型和媒体融合发展。【方法】采用网络调研和统计分析方法对69种林业类科技期刊的网站建设情况进行调研... 详细信息

【目的】找出我国林业类科技期刊网站建设在媒体融合背景下所存在的问题,为提升我国科技期刊网站建设水平提供参考,助力期刊数字化转型和媒体融合发展。【方法】采用网络调研和统计分析方法对69种林业类科技期刊的网站建设情况进行调研分析,对比分析期刊网站的不同建设情况和5年内影响因子的变化趋势,调研国内外多个顶级科技期刊网站的功能特点及优势。【结果】林业类头部科技期刊网站建设和新技术应用比例更高且影响力更大,尾部科技期刊网站建设滞后,对新技术的接受程度低。【结论】林业类科技期刊可能存在较大的网站建设和功能升级需求;科技期刊应运用新技术,加强自身网站建设,助力期刊创新与转型升级。

关键词：媒体融合网站建设 HTML XML 科技期刊

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城市危崖整治爆破

爆破器材 2000年第5期29卷 25-27页

作者：巫小川刘文辉蔡小虎厦门厦信工程建设监理事务所福建361000 厦门爆破工程公司福建361012

针对厦门市市区马峰山采石场东侧边坡悬崖高、陡和爆破环境复杂的特点 ,采用多种爆破参数和周密的安全措施 ,成功地完成了该城市危崖整治爆破工程。

关键词：城市爆破危崖爆破控制爆破

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浅谈测井资料在煤层气工程中的应用

中州煤炭 2010年第5期 41-42页

作者：蔡小虎河南省煤炭地质勘察研究院河南郑州450002

测井工作在煤层气工程中发挥着重要作用,介绍了如何通过测井资料解释煤层埋深、厚度,计算砂泥水含量,估算煤层中气体含量,进行固井质量评价;提出测井资料应用中应注意的事项。

关键词：煤层气自然电位补偿密度补偿声波

体外冲击波结合康复训练对膝关节术后功能障碍的临床效果分析

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反射疗法与康复医学 2022年第17期3卷 85-87,91页

作者：蔡啸虎无锡市锡山人民医院康复医学科江苏无锡214000

目的探讨对膝关节术后功能障碍患者采用体外冲击波结合康复训练的临床效果.方法选择该院2021年1月—2022年4月收治的62例膝关节术后功能障碍患者,以随机数表法分为两组.对照组(n=31)采用常规康复训练,观察组(n=31)在对照组基础上采用体... 详细信息

目的探讨对膝关节术后功能障碍患者采用体外冲击波结合康复训练的临床效果.方法选择该院2021年1月—2022年4月收治的62例膝关节术后功能障碍患者,以随机数表法分为两组.对照组(n=31)采用常规康复训练,观察组(n=31)在对照组基础上采用体外冲击波干预.比较两组关节活动度优良率、疼痛视觉模拟法(VAS)评分及美国纽约特种外科医院(HSS)膝关节评分.结果观察组关节活动度优良率为95.65%,高于对照组的80.43%,差异有统计学意义(P<0.05).干预后,观察组静息、运动时VAS评分分别为(1.42±0.34)分、(1.50±0.45)分,均高于对照组,组间差异有统计学意义(P<0.05).干预后,观察组HSS膝关节评分中疼痛、功能、活动度、肌力、屈曲畸形、稳定性分别为(26.04±3.27)分、(18.52±2.51)分、(16.21±1.42)分、(8.26±0.95)分、(8.18±1.05)分、(8.62±0.74)分,均高于对照组,组间差异有统计学意义(P<0.05).结论对膝关节术后功能障碍患者采用体外冲击波结合康复训练能提高其关节活动度,减轻疼痛程度,改善关节功能.

关键词：体外冲击波康复训练膝关节功能障碍疼痛活动度

Value Iteration-Based Distributed Adaptive Dynamic Programming for Multi-Player Differential Game With Incomplete Information

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IEEE/CAA Journal of Automatica Sinica 2025年第2期12卷 436-447页

作者： Yun Zhang Yuqi Wang Yunze cai the Department of Automation Shanghai Jiao Tong University the Key Laboratory of System Control and Information Processing Ministry of Education of China the National Key Laboratory of Air-based Information Perception and Fusion

In this paper, a distributed adaptive dynamic programming(ADP) framework based on value iteration is proposed for multi-player differential games. In the game setting,players have no access to the information of others' system parameters or control laws. Each player adopts an on-policy value iteration algorithm as the basic learning framework. To deal with the incomplete information structure, players collect a period of system trajectory data to compensate for the lack of information. The policy updating step is implemented by a nonlinear optimization problem aiming to search for the proximal admissible policy. Theoretical analysis shows that by adopting proximal policy searching rules, the approximated policies can converge to a neighborhood of equilibrium policies. The efficacy of our method is illustrated by three examples, which also demonstrate that the proposed method can accelerate the learning process compared with the centralized learning framework.

关键词： Distributed adaptive dynamic programming incomplete information multi-player differential game (MPDG) value iteration