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橡胶-砂胶结材料与季节性冻土桩基的水平作用机制分析

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公路与汽运 2024年第5期40卷 134-140,146页

作者：唐先武尹平保杨朝晖罗佩婷申奉歧长沙理工大学土木工程学院湖南长沙410114 阿拉斯加大学美国阿拉斯加安克雷奇99508

在季节性冻土区,气候因素引起的土体季节性冻融对桩基础的水平承载影响显著,在地震等水平荷载作用下桩基础极易发生断桩等脆性破坏。为消除或减弱季节性冻融对桩基的影响,文中采用抗冻融且高阻尼的橡胶-砂胶结材料置换桩周表层土体,改... 详细信息

在季节性冻土区,气候因素引起的土体季节性冻融对桩基础的水平承载影响显著,在地震等水平荷载作用下桩基础极易发生断桩等脆性破坏。为消除或减弱季节性冻融对桩基的影响,文中采用抗冻融且高阻尼的橡胶-砂胶结材料置换桩周表层土体,改善桩基的水平承载特性;结合美国阿拉斯加地区某实际工程桩,对季节性冻土区进行温度场模拟,建立桩-土相互作用有限元模型,对比分析置换前后桩基础的受力与变形,并对置换范围进行优化,得到最佳置换宽度和置换深度分别为1.0 d、6.0 d(d为桩基直径)。

关键词：桥梁桩基础季节性冻土橡胶-砂水平荷载温度场

基于OBE-BOPPPS的误差理论与测量平差基础课程教学改革研究

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测绘与空间地理信息 2024年第1期47卷 13-16页

作者：张志杰陈志辉赵伟杨朝辉连达军苏州科技大学地理科学与测绘工程学院江苏苏州215009

为推动课程教学质量的持续提升,本文结合我校误差理论与测量平差基础课程教学存在的问题及工程教育专业认证时专家提出的意见,基于OBE-BOPPPS教育理念与模式,从教学目标、内容与方法、教学方式和考核方式等方面对毕业要求的支撑关系进... 详细信息

为推动课程教学质量的持续提升,本文结合我校误差理论与测量平差基础课程教学存在的问题及工程教育专业认证时专家提出的意见,基于OBE-BOPPPS教育理念与模式,从教学目标、内容与方法、教学方式和考核方式等方面对毕业要求的支撑关系进行改革与实践。达成度指标分析表明,该模式有助于解决教学过程中学生参与度低与学习目标不明确等问题,提高教学质量。

关键词： OBE-BOPPPS 误差理论与测量平差课程改革达成度分析

六西格玛管理方法在放射科住院医师规范化培训教学质量管理中的应用

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中国毕业后医学教育 2024年第7期8卷 506-509页

作者：阮霞陈思涵文之阳朝晖欧阳凰晴陈军武汉大学人民医院放射科湖北武汉430060

目的本研究旨在探究六西格玛管理方法在放射科住院医师规范化培训(简称住培)教学质量管理中的应用,以期达到提升住院医师临床水平、提高其专业理论知识和实际应用能力、提升指导医师对住院医师工作满意度的目的。方法选取2020年8月—2... 详细信息

目的本研究旨在探究六西格玛管理方法在放射科住院医师规范化培训(简称住培)教学质量管理中的应用,以期达到提升住院医师临床水平、提高其专业理论知识和实际应用能力、提升指导医师对住院医师工作满意度的目的。方法选取2020年8月—2021年7月在武汉大学人民医院(简称该院)放射科的住院医师20名作为对照组,收集年度考核成绩,包括理论考试及阅片技能考试成绩,对指导医师和住院医师进行问卷调查,通过六西格玛管理模式对影响教学质量的原因进行调查、分析、总结,并制定改进措施。选取2021年8月—2022年7月在该院放射科的20名住院医师为观察组,采用六西格玛管理,以相同的方式收集数据,分析两组住院医师的理论和阅片技能考试成绩,以及指导医师对住院医师的工作满意度。结果在放射科住院医师临床教学中应用六西格玛方法后,住院医师在理论和阅片技巧考核中的表现和指导医师对住院医师的满意度都显著优于对照组,差异有统计学意义(P<0.05)。结论六西格玛管理方法在放射科住培教学质量管理中的意义重大,提升放射科住培教育质量和教育水平,住院医师的学习效果大幅提高。作为一种新的教育模式,六西格玛管理方法具有巨大的推广和运用价值,这为教学医院的临床教学工作开展提供了新策略。

关键词：六西格玛放射科住院医师规范化培训质量管理

Application of p-y approach in analyzing pile foundations in frozen ground overlying liquefiable soils

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Research in Cold and Arid Regions 2013年第4期5卷 368-376页

作者： zhaohui yang XiaoYu Zhang XiaoXuan Ge Elmer E. Marx Dept. of Civil Engineering University of Alaska Anchorage PND Engineers Inc. Northern Geotechnical Engineering Inc. State of Alaska DOT&PF Bridge Section

Two major earthquakes in Alaska, namely the 1964 Great Alaska Earthquake and the 2002 Denali Earthquake, occurred in winter seasons when the ground crust was frozen. None of the then-existing foundation types was able to withstand the force from the lateral spreading of frozen crust. This paper presents results from the analysis of pile foundations in frozen ground overlying lique- fiable soil utilizing the Beam-on-Nonlinear-Winlder-Foundation （BNWF）（or p-y approach）. P-multipliers were applied on tradi- tional sandy soil p-y curves to simulate soil strength degradation during liquefaction. Frozen soil p-y curves were constructed based on a model proposed in a recent study and the frozen soil mechanical properties obtained from testing of naturally frozen soils. Pile response results from the p-y approach were presented along with those from fluid-solid coupled Finite Element （FE） modeling for comparison purpose. Finally, the sensitivity of pile response to frozen soil parameters was investigated and a brief discussion is presented.

关键词： frozen ground crust lateral spreading liquefaction p-y approach pile foundation

Dynamic response of wind turbine towers in warm permafrost

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Research in Cold and Arid Regions 2014年第5期6卷 423-427页

作者： Benjamin Still zhaohui (Joey) yang Simon Evans FuJun Niu Dept.of Civil Engineering University of Alaska Anchorage State Key Laboratory of Frozen Soil Engineering Chinese Academy of Science Alaska Native Tribal Health Center AnchorageAK 99508USA State Key Laboratory of Frozen Soil Engineering Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences

Wind is a great source of renewable energy in western *** winds blow across the barren tundra underlain by warm permafrost in the winter season,when the energy demand is the *** engineering in warm permafrost has always been a challenge in wind energy *** warm permafrost poses engineering issues to design,construction,and operation of wind *** paper describes the foundation design of a wind turbine built in western *** presents a system for response monitoring and load assessment,and data collected from September 2013 to March *** dynamic properties are assessed based on the monitoring data,and seasonal changes in the dynamic properties of the turbine tower-foundation system and likely resonance between the spinning blades and the tower structure are *** analyses of a wind turbine in warm permafrost are valuable for designing or retrofitting of foundations in warm permafrost.

关键词： wind turbine vibration field monitoring warm permafrost

RIS辅助毫米波通感一体化关键技术与研究进展

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无线电通信技术 2024年第2期50卷 312-327页

作者：林方宇朱辰甘旭王得志王建斌杨照辉陈晓明黄崇文张朝阳浙江大学信息与电子工程学院浙江大学工程师学院中国电信股份有限公司浙江分公司无线网络中心

未来的6G系统需要同时满足多维性能需求，实现从万物互联到万物智联，因此，深度融合了传统定位、探测、成像等无线感知功能和无线传输功能的通信感知一体化(Integrated Sensing and Communication, ISAC)技术是未来6G网络的一个重要发... 详细信息

未来的6G系统需要同时满足多维性能需求，实现从万物互联到万物智联，因此，深度融合了传统定位、探测、成像等无线感知功能和无线传输功能的通信感知一体化(Integrated Sensing and Communication, ISAC)技术是未来6G网络的一个重要发展趋势。智能超表面(Reconfigurable Intelligent Surface, RIS)凭借其可以通过编程来智能调控电磁波传输环境且低成本、低功耗等优势成为6G的关键性使能技术，并催生了使用RIS辅助毫米波ISAC的新研究方向，其有望从底层架构到完整系统层面上解决6G新场景中的诸多难题、挑战。阐述了RIS辅助毫米波ISAC的起源与发展过程，介绍了其研究背景与国内外研究现状，指出并讨论了RIS辅助毫米波ISAC研究中的一些关键技术，分析了该领域已有的一些研究成果，进而展望了RIS辅助毫米波ISAC未来发展和面临的挑战。

关键词：通信感知一体化智能超表面 6G 毫米波

Shear properties of thawed natural permafrost by bender elements

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Research in Cold and Arid Regions 2017年第4期9卷 343-351页

作者： Feng Zhang zhaohui (Joey) yang JiaHui Wang HaiPeng Li Benjamin Still School of Transportation Science and Engineering Harbin Institute of Technology Harbin Heilongjiang 150090China College of Engineering University of Alaska Anchorage Anchorage Alaska 99508 USA School of Civil Engineering Harbin Institute of Technology Harbin Heilongjiang 150090 China State Key Laboratory of Geo-mechanics and Deep Underground Engineering China University of Mining and Technology Xuzhou Jiangsu 21116 China

Thawed permafrost could cause a serious stability problem for foundations and oil-wells in cold regions. A non-damage testing procedure, employing the Bender Element Method, was used for permafrost samples collected from a continuous frozen core obtained from the North Slope of Alaska, USA. The wave velocity and modulus of thawed permafrost were investigated on various isotropic confining pressure from 0 kPa to 400 kPa per 100 kPa. The received shear wave propagation was recorded, and the elastic wave theory was used to calculate shear modulus. Finally, the shear modulus affected by confining pressure, water content and dry density were analyzed and discussed, and a regression formulation of shear modulus based on the Janbu Model for thawed silty and sandy permafrost were proposed and validation.

关键词： shear velocity shear modulus thawed natural permafrost bender element

Discretionary Power in the Course of Granting Graduate Degree in America and Its Enlightenments

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International Journal of Technology Management 2015年第8期 35-37页

作者： Haixia ZHOU zhaohui yang School of Internal Communication Hebei Institute of Communications Scientific Research Office Hebei College of Industry and Technology

Graduate education is the key support to the national competitive and technological levels. Therefore, the system of granting graduate degree was clearly guaranteed in the national level. For example, there are Education Law and Higher Education Law in China; the people＇ s education right is protected by federal constitution in the United States, and also universities or institutes have their own charters to claim the relative rights. The system safeguards the legitimacy of degree granting, but also gives a considerable discretionary power to the granting units who can grant or cancel the degree.

关键词： America Graduate Degree Granting Discretionary Power

The first factor affecting dryland winter wheat grain yield under various mulching measures: Spike number

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Journal of Integrative Agriculture 2024年第3期23卷 836-848页

作者： Yingxia Dou Hubing Zhao Huimin yang Tao Wang Guanfei Liu zhaohui Wang Sukhdev Malhi Coliege of Natural Resources and Environment Northwest A&F UniversityYangling 712100China Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China Ministry of Agriculture and Rural AffairsYangling 712100China Department of Renewable Resources University of AlbertaEdmonton T6G 2H1Canada

Water is the key factor limiting dryland wheat grain *** affects crop yield and yield components by affecting soil *** research is needed to determine the relationships between yield components and soil moisture with yield,and to identify the most important factor affecting grain yield under various mulching measures.A long-term 9-yearifeld experiment in the Loess Plateau of Northwest China was carried out with three treatments:no mulch (CK),plastic mulch (M_(P)) and straw mulch (M_(S)).Yield factors and soil moisture were measured,and the relationships between them were explored by correlation analysis,structural equation modeling and significance *** results showed that compared with CK,the average grain yields of M_(P) and M_(S) increased by 13.0and 10.6%,*** average annual grain yield of the M_(P) treatment was 134 kg ha^(–1) higher than the M_(S) *** were no significant differences in yield components among the three treatments (P<0.05).Soil water storage of the M_(S) treatment was greater than the M_(P) treatment,although the differences were not statistically *** water storage during the summer fallow period (SWSSF) and soil water storage before sowing (SWSS) of M_(S) were significantly higher than in CK,which increased by 38.5 and 13.6%,*** relationship between M_(P) and CK was not statistically significant for SWSSF,but the SWSS in M_(P) was significantly higher than in *** terms of soil water storage after harvest (SWSH) and water consumption in the growth period(ET),there were no signi?cant differences among the three *** on the three analysis methods,we found that spike number and ET were positively correlated with grain ***,the relative importance of spike number to yield was the greatest in the M_(P )and M_(S) treatments,while that of ET was the greatest in *** SWSSF could indirectly increase spike number and ET in the three treatments.B

关键词： dryland winter wheat plastic mulch spike number straw mulch