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CBL-RISE教学法联合情景模拟在护理理论课程教学中的应用 被引量:1
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作者 黄晓彤 管清燕 +2 位作者 代会贞 孟庆慧 杨晓 《卫生职业教育》 2024年第1期44-47,共4页
目的探讨CBL-RISE教学法联合情景模拟在护理硕士专业学位研究生护理理论课程教学中的应用效果。方法采取便利抽样法,选取我校2019—2022级全日制护理硕士专业学位研究生为研究对象,将2019、2020级设为对照组,采用传统授课方式;2021、202... 目的探讨CBL-RISE教学法联合情景模拟在护理硕士专业学位研究生护理理论课程教学中的应用效果。方法采取便利抽样法,选取我校2019—2022级全日制护理硕士专业学位研究生为研究对象,将2019、2020级设为对照组,采用传统授课方式;2021、2022级设为观察组,采用CBL-RISE教学法联合情景模拟教学模式。比较两组学生的学业自我效能感、教学效果及教学满意度。结果观察组学业自我效能感、教学效果及教学满意度均优于对照组,两组比较差异有统计学意义(P<0.05)。结论CBL-RISE教学法联合情景模拟教学模式应用于护理硕士专业学位研究生护理理论课程,有利于提高护理硕士专业学位研究生的学业自我效能感、教学效果及教学满意度,并且能够推动护理理论教学案例库建设。 展开更多
关键词 CBL-rise教学法 情景模拟 护理理论 护理硕士专业学位研究生
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PBL-RISE教学模式在妇产科护理课程思政中的应用研究
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作者 闵敏 刘莉 张红玲 《中国继续医学教育》 2024年第10期71-75,共5页
目的 探讨基于问题的教学法(problem-based learning,PBL)联合以文献为导向的自我学习(reference induced self-education,RISE)(简称PBL-RISE教学模式)在妇产科护理课程思政教育中的应用效果。方法 采用便利抽样法选取2021年10月—2022... 目的 探讨基于问题的教学法(problem-based learning,PBL)联合以文献为导向的自我学习(reference induced self-education,RISE)(简称PBL-RISE教学模式)在妇产科护理课程思政教育中的应用效果。方法 采用便利抽样法选取2021年10月—2022年1月于华中科技大学同济医学院附属同济医院妇产科实习的78名护生作为教学对象,将2021年10—11月的39名护生设为对照组,将2021年12月—2022年1月的39名护生设为试验组。对照组采用传统教学模式,试验组采用PBLRISE教学模式。实习结束后,通过理论、操作考核及填写护士人文执业能力量表对2组的教学效果进行评价。结果 试验组理论考试成绩为(85.53±5.05)分,高于对照组的(79.11±6.93)分,差异有统计学意义(P <0.05);试验组操作技能成绩为(91.71±2.44)分,与对照组的(91.31±2.39)分比较,差异无统计学意义(P> 0.05)。试验组人文执业能力总分[(95.71±5.54)分]及人文关怀实践[(37.28±4.05)分]、人际沟通[(22.18±2.85)分]、自我管理[(10.64±1.65)分]、伦理与法律实践[(11.54±1.07)分]、心理调试[(14.08±1.75)分]得分均高于对照组[(84.58±5.11)分、(33.21±3.73)分、(19.82±2.25)分、(9.87±1.59)分、(10.05±1.19)分、(11.64±1.27)分],差异有统计学意义(P <0.05)。试验组总满意度(97.4%)与对照组(89.7%)比较,差异无统计学意义(P> 0.05)。结论 PBL-RISE教学模式应用于妇产科护理教学中有助于培养护生的人文执业能力,提升教学效果。 展开更多
关键词 PBL rise 教学模式 妇产科护理 课程思政 人文执业能力 教学效果
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国家能源集团RISE品牌战略的建构研究
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作者 李永生 《中国煤炭》 北大核心 2024年第1期21-28,共8页
在创建世界一流示范企业的进程中,国家能源集团的品牌价值得以迅速提升、品牌影响力迅速扩增,重要原因之一是推出实施了RISE品牌战略并取得显著成效。基于国家能源集团品牌战略的顶层设计和底层逻辑,对RISE品牌战略的丰富内涵和建构实... 在创建世界一流示范企业的进程中,国家能源集团的品牌价值得以迅速提升、品牌影响力迅速扩增,重要原因之一是推出实施了RISE品牌战略并取得显著成效。基于国家能源集团品牌战略的顶层设计和底层逻辑,对RISE品牌战略的丰富内涵和建构实践进行了阐述,总结了集团品牌战略研制路线图、品牌战略研究逻辑和品牌战略核心内容构建,以期对煤炭企业品牌战略研制和成就卓著品牌提供参考借鉴。 展开更多
关键词 国家能源集团 rise品牌战略 品牌建构 品牌价值 世界一流企业
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Analysis for Effects of Temperature Rise of PV Modules upon Driving Distance of Vehicle Integrated Photovoltaic Electric Vehicles
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作者 Masafumi Yamaguchi Yasuyuki Ota +18 位作者 Taizo Masuda Christian Thiel Anastasios Tsakalidis Arnulf Jaeger-Waldau Kenji Araki Kensuke Nishioka Tatsuya Takamoto Takashi Nakado Kazumi Yamada Tsutomu Tanimoto Yosuke Tomita Yusuke Zushi Kenichi Okumura Takashi Mabuchi Akinori Satou Kyotaro Nakamura Ryo Ozaki Nobuaki Kojima Yoshio Ohshita 《Energy and Power Engineering》 2024年第4期131-150,共20页
The development of vehicle integrated photovoltaics-powered electric vehicles (VIPV-EV) significantly reduces CO<sub>2</sub> emissions from the transport sector to realize a decarbonized society. Although ... The development of vehicle integrated photovoltaics-powered electric vehicles (VIPV-EV) significantly reduces CO<sub>2</sub> emissions from the transport sector to realize a decarbonized society. Although long-distance driving of VIPV-EV without electricity charging is expected in sunny regions, driving distance of VIPV-EV is affected by climate conditions such as solar irradiation and temperature rise of PV modules. In this paper, detailed analytical results for effects of climate conditions such as solar irradiation and temperature rise of PV modules upon driving distance of the VIPV-EV were presented by using test data for Toyota Prius and Nissan Van demonstration cars installed with high-efficiency InGaP/GaAs/InGaAs 3-junction solar cell modules with a module efficiency of more than 30%. The temperature rise of some PV modules studied in this study was shown to be expressed by some coefficients related to solar irradiation, wind speed and radiative cooling. The potential of VIPV-EV to be deployed in 10 major cities was also analyzed. Although sunshine cities such as Phoenix show the high reduction ratio of driving range with 17% due to temperature rise of VIPV modules, populous cities such as Tokyo show low reduction ratio of 9%. It was also shown in this paper that the difference between the driving distance of VIPV-EV driving in the morning and the afternoon is due to PV modules’ radiative cooling. In addition, the importance of heat dissipation of PV modules and the development of high-efficiency PV modules with better temperature coefficients was suggested in order to expand driving range of VIPV-EV. The effects of air-conditioner usage and partial shading in addition to the effects of temperature rise of VIPV modules were suggested as the other power losses of VIPV-EV. 展开更多
关键词 Vehicle Integrated Photovoltaics (VIPV) VIPV-Powered Electric Vehicles Driving Distance PV Modules Solar Irradiation Temperature rise Radiative Cooling
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The Impact of Sea Level Rise on Roadway Design and Evacuation Routes in Delaware
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作者 Jack Palevich Ardeshir Faghri Ahmet Karakurt 《American Journal of Climate Change》 2024年第1期69-82,共14页
As the global temperature continues to increase, the sea level continues to rise at a rapid rate that has never been seen before. This becomes an issue for many facets of life but one of the most impacted is the trans... As the global temperature continues to increase, the sea level continues to rise at a rapid rate that has never been seen before. This becomes an issue for many facets of life but one of the most impacted is the transportation infrastructure. Many people living in low elevation coastal areas can become trapped by flooding with no way in or out. With Delaware being a coastal state, this would affect a large portion of the population and will have detrimental effects over time if nothing is done to combat sea level rise. The issue with sea level rise in transportation is that once the roads become flooded, they become virtually unusable and detour routes would be needed. If all the roads in a coastal area were to be affected by sea level rise, the options for detours would become limited. This article looks at direct solutions to combat sea level rise and indirect solutions that would specifically help transportation infrastructure and evacuation routes in Delaware. There is not one solution that can fix every problem, so many solutions are laid out to see what is applicable to each affected area. Some solutions include defense structures that would be put close to the coast, raising the elevation of vulnerable roads throughout the state and including pumping stations to drain the water on the surface of the road. With an understanding of all these solutions around the world, the ultimate conclusion came in the form of a six-step plan that Delaware should take in order to best design against sea level rise in these coastal areas. 展开更多
关键词 Sea Level rise Roadway Design Evacuation Routes
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沙茨基海隆(Shatsky Rise)白垩纪玄武岩的地球化学特征及其地幔柱-洋中脊相互作用过程
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作者 陈静 陈双双 +1 位作者 高锐 刘嘉麒 《岩石学报》 SCIE EI CAS CSCD 北大核心 2023年第8期2379-2401,共23页
沙茨基海隆(Shatsky Rise)是白垩纪早期形成的西北太平洋大火成岩省,其成因和演化过程目前仍存在较大争议。本次研究对沙茨基海隆白垩纪玄武岩进行了全岩主量、微量元素、Sr-Nd-Pb同位素的分析。沙茨基海隆玄武岩主要属于拉斑玄武岩,具... 沙茨基海隆(Shatsky Rise)是白垩纪早期形成的西北太平洋大火成岩省,其成因和演化过程目前仍存在较大争议。本次研究对沙茨基海隆白垩纪玄武岩进行了全岩主量、微量元素、Sr-Nd-Pb同位素的分析。沙茨基海隆玄武岩主要属于拉斑玄武岩,具有较亏损的大离子亲石元素和轻稀土元素以及较富集的重稀土元素的特征,没有明显的Eu异常(δEu=0.99~1.29),与正常洋中脊玄武岩(N-MORB)的微量元素配分模式较为相似。然而该系列玄武岩却具有相对较富集的初始^(87)Sr/^(86)Sr(0.702986~0.703991)和^(143)Nd/^(144)Nd(0.513034~0.513194)同位素比值、较富集的^(207)Pb/^(204)Pb(15.439~15.508)和^(208)Pb/^(204)Pb(37.853~38.488)同位素比值,与富集的洋岛玄武岩(OIB)和岛弧火山岩的同位素成分较为相似,且源区混入高U/Pb比值(HIMU型)的富集地幔成分。稀土元素部分熔融模拟反演表明沙茨基海隆火山岩的原始岩浆可能起源于尖晶石相二辉橄榄岩源区,且具有较高程度的部分熔融作用(>10%)。在以上研究基础上,本文提出地幔柱-洋中脊相互作用模型来解释沙茨基海隆拉斑玄武岩较亏损的不相容元素成分和较富集的同位素成分这一特殊地球化学特征。由于来自扩张洋中脊的强大拉张应力的影响,地幔柱岩浆物质将流向洋中脊并发生减压部分熔融,导致不相容元素的高度亏损,但由于放射成因元素(Sm、Rb和U)的半衰期相对较长,同位素成分则难以在较短时间内被改变,因此本文推测沙茨基海隆同位素富集的N-MORB拉斑玄武岩可能是地幔柱-洋中脊相互作用的产物。 展开更多
关键词 SR-ND-PB同位素 拉斑玄武岩 地幔柱 扩张三节点 沙茨基海隆
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基于RBFNN和改进RISE控制策略的无人直升机轨迹跟踪控制
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作者 张浩然 李涛 +1 位作者 潘世豪 冒泽慧 《兵器装备工程学报》 CAS CSCD 北大核心 2023年第7期217-226,共10页
考虑模型不确定性和外部干扰等影响,基于径向基函数神经网络(radial basis function neural network,RBFNN)和改进的误差符号函数鲁棒积分(robust integral of signum error,RISE)技术,建立无人直升机(unmanned aerial helicopter,UAH)... 考虑模型不确定性和外部干扰等影响,基于径向基函数神经网络(radial basis function neural network,RBFNN)和改进的误差符号函数鲁棒积分(robust integral of signum error,RISE)技术,建立无人直升机(unmanned aerial helicopter,UAH)轨迹跟踪控制设计方案。首先,建立包含模型不确定性和外部干扰的UAH非线性系统模型,利用跟踪误差作为RBFNN输入信号估计由模型不确定性和外部干扰组成的复合扰动。其次,将滤波信号及其变化率权重组合作为RISE输入信号设计控制器,从而降低控制设计方案对UAH动力学模型的依赖程度。进而,借助Lyapunov稳定性理论分析整合后闭环跟踪误差系统的稳定性,并给出控制参数的选取方法。最后,借助现有文献中UAH系统模型,仿真与比较结果均说明所提控制算法的有效性和优越性。 展开更多
关键词 无人直升机 轨迹跟踪控制 复合扰动 神经网络 误差符号函数鲁棒积分
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CBL-RISE教学模式在神经外科新入职护士实习带教中的应用效果 被引量:4
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作者 康慧敏 管义祥 +1 位作者 戎捷骊 崔益秋 《中国继续医学教育》 2023年第8期66-71,共6页
目的探讨以案例为导向的教学法(case-based learning,CBL)联合以文献为导向的自我学习(reference induced self-education,RISE)(简称为CBL-RISE教学模式)在神经外科新入职护士实习带教中的应用效果。方法选取2021年1—12月在海安市人... 目的探讨以案例为导向的教学法(case-based learning,CBL)联合以文献为导向的自我学习(reference induced self-education,RISE)(简称为CBL-RISE教学模式)在神经外科新入职护士实习带教中的应用效果。方法选取2021年1—12月在海安市人民医院接受CBL-RISE教学模式进行实习带教的42名神经外科新入职护士为观察组,并与在2021年1月之前接受传统教学法进行实习带教的42名神经外科新入职护士(对照组)进行比较,评价两组护士理论知识和实践操作技能的考核成绩,临床思维能力及自主学习能力培养情况,以及对教学效果的自评情况。结果与对照组比较,观察组护士的理论知识和实践操作技能考核成绩得分更高(P<0.05),且观察组考核成绩的优秀率、及格率均高于对照组(P<0.05)。与对照组比较,观察组护士的临床思维能力、自主学习能力评分更高(P<0.05)。与对照组比较,观察组护士对教学模式自评效果评分更高(P<0.05)。结论CBL-RISE教学模式应用于神经外科新入职护士实习带教中,有利于提高护士理论知识及实践操作技能的掌握程度,能够提升护士的临床思维及自主学习能力,有效提高护理教学效果。 展开更多
关键词 神经外科 病案引导 以文献为导向的自我学习 护理 实习带教 CBL-rise
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基于虚拟分解的液压机械手RISE渐近跟踪控制
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作者 樊雕 姚建勇 邓文翔 《机床与液压》 北大核心 2023年第23期1-9,共9页
多自由度液压机械臂是一个多输入多输出、强非线性、强耦合的机电液复杂非线性系统,对液压机械臂精确控制是极富挑战的任务。提出一种基于虚拟分解的误差符号积分鲁棒控制方法用于液压机械手系统的高精度跟踪控制。考虑三关节之间的动... 多自由度液压机械臂是一个多输入多输出、强非线性、强耦合的机电液复杂非线性系统,对液压机械臂精确控制是极富挑战的任务。提出一种基于虚拟分解的误差符号积分鲁棒控制方法用于液压机械手系统的高精度跟踪控制。考虑三关节之间的动力学耦合、液压作动器动态和摩擦效应,首先基于虚拟分解建立液压机械手的运动学和动力学数学模型,基于虚拟功率流保证子系统和整个系统的L_(2)和L_(∞)稳定性,设计虚拟控制方法。然后进一步将关节之间的耦合作用融入到鲁棒控制器设计之中,发展出基于虚拟分解的误差符号积分鲁棒控制方法,进一步增强了关节位置跟踪能力。基于Lyapunov理论证明该控制方法可实现位置跟踪误差的渐近收敛。对比仿真结果表明,提出的基于虚拟分解的鲁棒积分控制器具有优异的渐近跟踪性能。 展开更多
关键词 液压机械臂 虚拟分解 积分鲁棒控制 渐近收敛
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基于改进型RISE-MC-LADRC的逆变器电压控制
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作者 邱超颖 黄媛 +1 位作者 余溢威 刘铸辉 《电力系统及其自动化学报》 CSCD 北大核心 2023年第10期97-106,共10页
针对模型补偿线性自抗扰控制下的逆变器抗扰能力不足的问题,提出一种基于改进型误差符号鲁棒积分的模型补偿线性自抗扰控制策略。首先,引入抗扰能力更强的误差符号鲁棒积分替代传统的线性状态误差反馈律,实现对强扰动的有效抑制。然后,... 针对模型补偿线性自抗扰控制下的逆变器抗扰能力不足的问题,提出一种基于改进型误差符号鲁棒积分的模型补偿线性自抗扰控制策略。首先,引入抗扰能力更强的误差符号鲁棒积分替代传统的线性状态误差反馈律,实现对强扰动的有效抑制。然后,对传统的线性扩张状态观测器进行改进,将各状态变量与其估计值之间的误差作为各估计值导数的调节依据,并通过比例微分环节对其进行校正,从而提高线性扩张状态观测器的观测精度。最后,通过Lyapunov理论证明了改进后控制器的稳定性。仿真结果验证了所提策略的有效性和优越性。 展开更多
关键词 逆变器 线性自抗扰控制 模型补偿 误差符号鲁棒积分 比例微分 LYAPUNOV
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Prediction of the joint impacts of sea level rise and land development on distribution patterns of mangrove communities
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作者 Shanshan Liang Wenjia Hu +6 位作者 Peiqiang Wu Jianbu Wang Shangke Su Guangcheng Chen Jianguo Du Wenhua Liu Bin Chen 《Forest Ecosystems》 SCIE CSCD 2023年第2期176-186,共11页
Mangrove distribution along shorelines shows distinct zonation patterns;thus,different communities may face various influences from sea level rise(SLR)and land use.However,long-term change predictions are usually base... Mangrove distribution along shorelines shows distinct zonation patterns;thus,different communities may face various influences from sea level rise(SLR)and land use.However,long-term change predictions are usually based only on the total extent of mangroves.Few studies have revealed how SLR and land development such as agriculture,aquaculture,and urbanization jointly affect different intertidal mangrove communities.This study proposed a novel framework combining SLAMM(Sea Level Affecting Marshes Model)and the CLUE-S(Conversion of Land Use and its Effect at Small regional extent)model to assess the potential impacts on upper and lower intertidal mangrove communities.Maoweihai in Guangxi,China,was selected as the study area and the potential impacts from the squeeze effect and mangrove expansion potential were evaluated.We established three scenarios combining SLR and land use patterns to predict mangrove coverage projections by 2070.The results showed that,under a single SLR driver,the upper intertidal mangroves would be more adaptive to rapid SLR than the lower intertidal mangroves.However,under the combined influence of the two drivers,the upper intertidal mangroves would experience larger squeeze effects than the lower intertidal mangroves,with up to 80.5%of suitable habitat lost.Moreover,the expansion potential of upper intertidal mangroves would be considerably more limited than that of lower intertidal mangroves.The length of the expandable habitat patch boundary of upper intertidal mangroves only reached 1.4–1.8 km,while that of the lower intertidal mangroves reached up to99.2–111.2 km.Further,we found that aquaculture ponds and cropland are the top two land development types that could occupy suitable habitat and restrict the mangrove expansion potential.Our results highlight that timely improvement of land use policies to create available landward accommodation space for mangrove migration is essential to maintain the coverage and diversity of mangrove communities under SLR.The proposed method can be a helpful tool for adaptive mangrove conservation and management under climate change. 展开更多
关键词 Coastal development Climate change Mangrove communities Mangrove adaption Land use Sea level rise
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The effect of pulse voltage rise rate on the polypropylene surface hydrophilic modification by ns pulsed nitrogen DBD
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作者 刘峰 李舒豪 +3 位作者 赵昱雷 Shakeel AKRAM 张丽 方志 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第10期6-14,共9页
The nanosecond(ns) pulsed nitrogen dielectric barrier discharge(DBD) is employed to enhance the hydrophilicity of polypropylene(PP) surface and improve its application effect.The discharge characteristics of the ns pu... The nanosecond(ns) pulsed nitrogen dielectric barrier discharge(DBD) is employed to enhance the hydrophilicity of polypropylene(PP) surface and improve its application effect.The discharge characteristics of the ns pulsed nitrogen DBD with different pulse rise times(from 50to 500 ns) are investigated by electrical and optical diagnostic methods and the discharge uniformity is quantitatively analyzed by image processing method.To characterize the surface hydrophilicity,the water contact angle(WCA) is measured,and the physical morphology and chemical composition of PP before and after modification are analyzed to explore the effect of plasma on PP surface.It is found that with increasing pulse rise time from 50 to 500 ns,DBD uniformity becomes worse,energy efficiency decreases from 20% to 10.8%,and electron density decrease from 6.6 × 10^(11)to 5.5 × 10^(11)cm^(-3).The tendency of electron temperature is characterized with the intensity ratio of N_(2)/N_(2)^(+)emission spectrum,which decreases from 17.4 to15.9 indicating the decreasing of T_(e) with increasing pulse rise time from 50 to 500 ns.The PP surface treated with 50 ns pulse rise time DBD has a lower WCA(~47°),while the WCA of PP treated with 100 to 500 ns pulse rise time DBD expands gradually(~50°–57°).According to the study of the fixed-point WCA values,the DBD-treated PP surface has superior uniformity under50 ns pulse rise time(3° variation) than under 300 ns pulse rise time(8° variation).After DBD treatment,the increased surface roughness from 2.0 to 9.8 nm and hydrophilic oxygencontaining groups on the surface,i.e.hydroxyl(-OH) and carbonyl(C=O) have played the significant role to improve the sample’s surface hydrophilicity.The short pulse voltage rise time enhances the reduced electric field strength(E/n) in the discharge space and improves the discharge uniformity,which makes relatively sufficient physical and chemical reactions have taken place on the PP surface,resulting in better treatment uniformity. 展开更多
关键词 dielectric barrier discharge pulse rise time material surface modification POLYPROPYLENE UNIFORMITY
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Potential effects of sea level rise on the soil-atmosphere green-house gas emissions in Kandelia obovata mangrove forests
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作者 Jiahui Chen Shichen Zeng +3 位作者 Min Gao Guangcheng Chen Heng Zhu Yong Ye 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2023年第4期25-32,共8页
Mangrove forests are under the stress of sea level rise(SLR)which would affect mangrove soil biogeochemistry.Mangrove soils are important sources of soil-atmosphere greenhouse gas(GHG)emissions,including carbon dioxid... Mangrove forests are under the stress of sea level rise(SLR)which would affect mangrove soil biogeochemistry.Mangrove soils are important sources of soil-atmosphere greenhouse gas(GHG)emissions,including carbon dioxide(CO_(2)),methane(CH_(4))and nitrous oxide(N_(2)O).Understanding how SLR influences GHG emissions is critical for evaluating mangrove blue carbon capability.In this study,potential effects of SLR on the GHG emissions were quantified through static closed chamber technique among three sites under different intertidal elevations,representing tidal flooding situation of SLR values of 0 cm,40 cm and 80 cm,respectively.Compared with Site SLR 0 cm,annual CO_(2) and N_(2)O fluxes decreased by approximately 75.0%and 27.3%due to higher soil water content,lower salinity and soil nutrient environments at Site SLR 80 cm.However,CH_(4) fluxes increased by approximately 13.7%at Site SLR 40 cm and 8.8%at Site SLR 80 cm because of lower salinity,higher soil water content and soil pH.CO_(2)-equivalent fluxes were 396.61 g/(m^(2)·a),1423.29 g/(m^(2)·a)and 1420.21 g/(m^(2)·a)at Sites SLR 80 cm,SLR 40 cm and SLR 0 cm,respectively.From Site SLR 0 cm to Site SLR 80 cm,contribution rate of N_(2)O and CH_(4) increased by approximately 7.42%and 3.02%,while contribution rate of CO_(2) decreased by approximately 10.44%.The results indicated that warming potential of trace CH_(4) and N_(2)O was non-negligible with SLR.Potential effects of SLR on the mangrove blue carbon capability should warrant attention due to changes of all three greenhouse gas fluxes with SLR. 展开更多
关键词 carbon dioxide METHANE nitrous oxide CO_(2)-equivalent fluxes sea level rise mangrove forest
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Correlation Analysis of Wind Turbine Temperature Rise and Exergy Efficiency Based on Field-Path Coupling
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作者 Caifeng Wen Qiang Wang +4 位作者 Yang Cao Liru Zhang Wenxin Wang Boxin Zhang Qian Du 《Energy Engineering》 EI 2023年第7期1603-1619,共17页
To solve the problems of large losses and low productivity of permanent magnet synchronous generators used in wind power systems,the field-circuit coupling method is used to accurately solve the electromagnetic field ... To solve the problems of large losses and low productivity of permanent magnet synchronous generators used in wind power systems,the field-circuit coupling method is used to accurately solve the electromagnetic field and temperature field of the generator.The loss distribution of the motor is accurately obtained by considering the influence of external circuit characteristics on its internal physical field.By mapping the losses to the corresponding part of the three-dimensional finite element model of the motor,the temperature field is solved,and the global temperature distribution of the generator,considering the influence of end windings,is obtained.By changing the air gap length,permanent magnet thickness,and winding conductivity,the relationship between the loss,temperature rise,and exergy efficiency can be obtained.By optimizing the air gap length,permanent magnet thickness,and winding conductivity,the best configuration and material properties can improve the efficiency of the motor by up to 4%. 展开更多
关键词 Wind turbine field-path coupling temperature rise distribution exergy efficiency
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Can a global mean sea-level rise reduce the Last Interglacial model-data mismatch in East Asia?
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作者 Zhiqi Qian Tianao Xu +1 位作者 Zhongshi Zhang Chunju Huang 《Atmospheric and Oceanic Science Letters》 CSCD 2023年第5期121-128,共8页
末次间冰期有着丰富的重建和模拟资料,为研究未来温暖气候提供了一个理想的参考.然而,关于末次间冰期的东亚气候,模拟与重建的结果间长期存在着不匹配的情况,模拟结果普遍较重建结果更为冷干。本研究利用挪威地球系统模式(NorESM1-F),... 末次间冰期有着丰富的重建和模拟资料,为研究未来温暖气候提供了一个理想的参考.然而,关于末次间冰期的东亚气候,模拟与重建的结果间长期存在着不匹配的情况,模拟结果普遍较重建结果更为冷干。本研究利用挪威地球系统模式(NorESM1-F),探讨了在末次间冰期模拟试验中纳入全球平均海平面上升能否减少模式-数据的不匹配.该试验结果表明,海平面上升情况下东亚地区会产生一定的增温增湿效应,但不足以消除模式-数据不匹配.基于这些结果,作者探讨了其它可能造成不匹配的因素以供进一步研究. 展开更多
关键词 末次间冰期 海平面上升 模式-数据不匹配
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Evaluating the Influence of Sea Level Rise on Beel Kapalia’s Livelihood and Local Adaptation Strategies: Perspectives from the Local Community
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作者 Md. Rasheeq Rahman Tahsin Tareque Seyedali Mirmotalebi 《Open Journal of Civil Engineering》 2023年第4期617-636,共20页
Bangladesh is vulnerable to climate change-induced sea level rise due to its location and socioeconomic position. The study examines the Beel Kapalia region in polder no. 24 of the Monirampur upazila of Jessore distri... Bangladesh is vulnerable to climate change-induced sea level rise due to its location and socioeconomic position. The study examines the Beel Kapalia region in polder no. 24 of the Monirampur upazila of Jessore district, Khulna division. To assess local attitudes on sea level rise-related permanent flooding, Kapalia, Monoharpur, Nehalpur, Balidaha, and Panchakori were polled. This flooding has disrupted residents’ lifestyles, making them vulnerable to increasing sea levels. Viability and adaptability were assessed using livelihood capitals. Participants’ thoughts and knowledge about their resilience in several livelihood factors were gathered using participatory rural appraisal (PRA) instruments and a questionnaire survey in the area. Major discoveries include the impact of permanent floods on Beel Kapalia’s livelihoods, vulnerability and resilience assessments in numerous villages, and community viewpoints on regional adaptation methods to mitigate these consequences. The study found that a sustained 30.5 cm inundation would reduce local human, natural, physical, financial, and social capital resilience to 69.6%, 30.7%, 69.1%, 68.9%, and 69.1%. A constant 61 cm inundation would lower resistance to 40.9%, 8.7%, 42.4%, 45.6%, and 43.8%. Residents believe they can weather a 30.5 cm inundation with local adaptation measures, but if the water level rises to 61 cm, they may be displaced. 展开更多
关键词 ADAPTATION Beel Kapalia Climate Change Livelihood Capitals Sea Level rise
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Navigating Temporal and Spatial Dimensions:Unveiling the Fictional Essence and Authenticity in the Narrative of The Rise and Fall of Wing Shing Street
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作者 Xiaohan Lu Jing Yang 《Journal of Contemporary Educational Research》 2023年第11期6-10,共5页
The novel The Rise and Fall of Wing Shing Street delves into the reality of Hong Kong residents deeply attuned to spatial awareness but detached from temporal significance,entangling emotions surrounding time and spac... The novel The Rise and Fall of Wing Shing Street delves into the reality of Hong Kong residents deeply attuned to spatial awareness but detached from temporal significance,entangling emotions surrounding time and space.Through narrative interruption and extension,the author portrays the genuine struggles of Hong Kong inhabitants-juxtaposing the blurred boundaries of time and space and the inherent rootlessness of reality within a fictionalized framework.Emphasizing the 20th-century human condition,wherein spatial awareness overshadows temporal understanding,the novel underscores the consequences:a loss of history and cultural identity.With a fresh perspective,the narrative explores the interplay of time and space,accentuating both the fictitious and authentic dimensions.This prompts readers to reconsider their history,culture,and the current moment,ultimately highlighting the pivotal role of temporal awareness. 展开更多
关键词 The rise and Fall of Wing Shing Street Spatial awareness Temporal awareness Rootlessness Cultural identity Return of the heart
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超材料天线罩温度升高快速分析
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作者 张强 孙红兵 +4 位作者 李钊 周浩 钱吉裕 唐守柱 李洋 《现代雷达》 CSCD 北大核心 2024年第3期21-27,共7页
随着电子系统的功率越来越高,必须考虑超材料天线罩中温度升高。由于超材料天线罩的复杂性,其温度升高分析难度更大。超材料天线罩的热分析涉及电磁场和温度场的多物理场的分析,对于电大尺寸的天线罩,模型复杂,计算时间很长。文中首先... 随着电子系统的功率越来越高,必须考虑超材料天线罩中温度升高。由于超材料天线罩的复杂性,其温度升高分析难度更大。超材料天线罩的热分析涉及电磁场和温度场的多物理场的分析,对于电大尺寸的天线罩,模型复杂,计算时间很长。文中首先进行了系统的理论分析,然后给出了天线罩内部温度升高的快速方法,先后计算了单层超材料天线罩、夹层超材料天线罩的最大温度升高和温度升高分布,计算结果与实测及全波仿真符合较好,与全波分析相比计算时间大大缩短,速度提高数百倍。该方法物理概念清晰,快速简便,还能够迅速分析存在环境温度差情况下的超材料天线罩的温度升高分布,为大功率系统中的超材料天线罩设计提供有力的支撑。 展开更多
关键词 天线罩 超材料 温度升高 快速分析 降本增效
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油浸式变压器绕组瞬态温升降阶快速计算方法
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作者 刘刚 胡万君 +2 位作者 郝世缘 刘云鹏 李琳 《电工技术学报》 EI CSCD 北大核心 2024年第3期643-657,共15页
油浸式电力变压器绕组温升监测是保证其安全稳定运行的重要手段。为了改善采用有限元方法计算油浸式电力变压器绕组瞬态温升时存在效率不高的问题,提出一种结构保留的本征正交分解(SPOD)与离散经验插值方法(DEIM)相结合的计算策略。首先... 油浸式电力变压器绕组温升监测是保证其安全稳定运行的重要手段。为了改善采用有限元方法计算油浸式电力变压器绕组瞬态温升时存在效率不高的问题,提出一种结构保留的本征正交分解(SPOD)与离散经验插值方法(DEIM)相结合的计算策略。首先,该文采用最小二乘有限元法(LSFEM)与迎风有限元法(UFEM)构建变压器绕组瞬态温升计算控制方程;其次,针对控制方程的特点,引入SPOD方法,通过将采样时间内的计算结果构成快照矩阵,建立降阶模型,降低有限元刚度矩阵的计算阶数,提高求解有限元方程的效率;然后,为了改善本征正交分解方法对于非线性问题效率提升不高的缺陷,结合DEIM算法,对有限元方程中的非线性项进行插值处理,从而减少每一时步形成总体刚度矩阵的时间,进一步提高总体计算效率。为了验证文章所提算法的精确性及高效性,根据油浸式电力变压器绕组的基本特点,建立了单分区分匝绕组传热模型,对其瞬态传热过程进行计算,结果表明:基于SPOD-DEIM的有限元降阶计算能够在保证精度的前提下有效提高计算效率,与全阶计算结果相比,流场与温度场的计算误差均不超过1.5%,且计算效率提升5.1倍。同时,为了充分说明SPOD-DEIM算法在工程应用中的价值,该文基于110 kV变压器绕组搭建了温升实验平台,建立了八分区分匝绕组数值计算模型,对算法的精度、效率及工程应用价值进行了验证及讨论,计算及实验结果表明:精度方面,降阶计算较全阶计算的瞬态全过程计算误差小于2.5%,且与实验结果相比,误差不超过5.41K;效率方面,降阶计算的全过程计算时间为54.28 h,与全阶计算相比,计算效率提升至10.57倍,与商业仿真软件Fluent相比,效率提升至6.37倍,充分说明所提算法的高效性及工程应用价值,为大型电力设备快速仿真提供新思路。 展开更多
关键词 绕组瞬态温升 结构保留 本征正交分解 离散经验插值 降阶计算 温升实验
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TC11钛合金动态热塑互动行为研究
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作者 陈军红 尹标 +2 位作者 徐伟芳 张方举 谢若泽 《爆炸与冲击》 EI CAS CSCD 北大核心 2024年第5期88-98,共11页
利用分离式霍普金森压杆对TC11钛合金平板帽形试样进行动态加载,基于高频红外点阵测温技术捕捉了剪切区温升随加载时间变化的历程,结合热传导理论分析和动态剪切数值模拟,分析了动态剪切过程中剪切区温升随时间和空间的分布规律。研究... 利用分离式霍普金森压杆对TC11钛合金平板帽形试样进行动态加载,基于高频红外点阵测温技术捕捉了剪切区温升随加载时间变化的历程,结合热传导理论分析和动态剪切数值模拟,分析了动态剪切过程中剪切区温升随时间和空间的分布规律。研究结果表明,在动态剪切加载下,TC11钛合金表现出脆性的变形行为,剪切区最高温升为430℃,且在实验所覆盖的加载速率范围内,加载速率对动态剪切温升影响不明显;显著的温升主要集中在剪切区中心附近100μm量级区域内,温升区具有高度局部化的特征,且剪切区维持较高温度所持续的时间在10μs量级。理论研究和数值模拟发现,动态加载下剪切区内最高温度可达751℃,剪切区温度时空分布规律与实验结果保持一致。实验和数值模拟结果均显示,剪切区最高温升发生在材料断裂时刻,表明剪切区显著温升应来源于剪切变形造成的应变高度集中发展。 展开更多
关键词 动态剪切 钛合金 温升 热传导 分离式霍普金森压杆
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