Results 11 to 20 of about 22,626 (131)
面向调频应用的扁管式可逆固体氧化物电堆控制特性分析 [PDF]
全球能源互联网, 2022 良好的电化学动态响应性能以及功率输出的长期耐久性是高温可逆固体氧化物电池（reversible solid oxide cell，RSOC）应用于调频等电力辅助服务的技术基础。针对一种新型内嵌微流道的扁管式电堆，从调频控制的角度，试验考察了RSOC电堆的发电/电解工作控制特性、负荷动态响应特性以及长时间运行衰减特性。结果表明，新型电堆燃料传质特性良好，可优先选择氢气流量、水氢比、工作温度等参数实现对应发电/电解模式下的调频应用控制。在温度控制不变的情况下，动态试验表明了新型电堆受传质/传热影响 ...
高丹慧 +6 more
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Dizhen xuebao, 2022 研究不同时频特性的地震波作用下，抗震结构和隔震结构耦合设备的动力响应，对五层钢框架振动台模型试验数据进行小波分析。结果表明：主结构动力响应与地震波时频特性直接相关；由于主结构和隔震支座的滤波作用，设备的动力响应受地震波时频特性影响显著，但不具有直接相关性；隔震结构可以使设备的频率远离主结构的频率，从而降低设备的放大系数；设备耦合之后主体结构加速度的变化趋势取决于不同时频特性的地震波能量分布。
Miao Han +3 more
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Gaoya dianqi, 2022 为提高真空断路器分合闸性能和智能化操作水平，提出了适用于真空断路器电机操动机构的RBF-PID控制方法，结合有限转角永磁无刷直流驱动电机动态数学模型，分析了驱动电机转速响应特性和运动过程可控性，构建了电机操动机构神经网络控制方程，对PID控制参数进行优化整定，分别计算分析常规PID和RBF-PID控制方法作用下真空断路器操作速度的跟踪特性。研制了电机操动机构速度控制系统，开展了真空断路器电机操动机构速度跟踪特性实验，结果表明，采用RBF-PID控制方法可以有效降低速度跟踪误差 ...
史可鉴 +5 more
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Zhejiang Daxue xuebao. Lixue ban, 2001 本文根据浙江舟山群岛地区金塘水道、册子水道、虾峙门水道和灌门水道的水文泥沙和沉积资料，以峡道水动力特性为出发点，分析了峡道环境中的水文泥沙特性和沉积特性，初步探讨了沉积峡道效应，文章指出，沉积峡道效应是指在峡道环境中，受峡道水动力特性及其影响下的泥沙运动作用，在峡道中所形成的沉积特点和变化过程.这种变化既不同于受单向水流作用的河流环境，也不同于受盐淡水共同作用的河口环境，也有别于开敞的海岸环境.峡道沉积的重要特点在于，在垂直于水流运动方向的横向上，存在显著的沉积相变.
JIANGGuo-jun(蒋国俊)
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Biodiversity as a Dominant Force in Shaping Ethnic Music Styles 生物多样性:塑造民族音乐风格的主导力量
Integrative Conservation, EarlyView.Our findings show that plant, bird, and mammal diversity considerably shape musical features such as vocal range and ornamental sounds, more so than geography or lifestyle. Our study provides the first empirical evidence linking biodiversity to ethnic music styles. Protecting biodiversity, the musical and cultural will be protected.
Wenchen Song, Yifan Xue, Rui Li
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Integrative Conservation, EarlyView.This study reconstructs the phylogeny of the Javan Hawk‐Eagle (Nisaetus bartelsi) within the subfamily Aquilinae using Maximum Likelihood and Bayesian Inference algorithms on a blood sample and GenBank data. The analysis reveals that the sampled genus Nisaetus forms a monophyletic group. Furthermore, N. bartelsi occupies a sister‐taxon of N.
Almas Lathifatul Ula +3 more
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Integrative Conservation, EarlyView.A survey of IUCN Bear Specialist Group (BSG) members revealed that habitat loss, degradation and fragmentation is the greatest threat to each of the 7 species of terrestrial bears. Poaching and human–bear conflicts are also high threats for some of these species.
David L. Garshelis +3 more
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Beyond Universalism: A Contextual Approach to Comparative Public Administration
Public Administration and Development, EarlyView.ABSTRACT In this essay, I advocate for a contextual approach to comparative public administration, arguing that effective governance reform requires moving away from universal models to embrace local political, socioeconomic, and institutional realities.
XiaoHu Wang
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Wildlife Letters, EarlyView.Using a 3‐year, broad‐scale camera‐trap network in western Kansas, we tested whether coyotes and American badgers exhibit spatiotemporal patterns consistent with coordinated hunting. Despite high diel activity overlap, detection‐conditioned co‐detections occurred far less frequently than expected under independence, and short‐term temporal sequencing ...
Ty J. Werdel +3 more
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Gaoya dianqi, 2015 高压断路器中常常采用不同的传动机构来连接灭弧室本体和操动机构,实现分闸、合闸与自动重合闸操作,同时传动机构又会对其动作特性产生影响。笔者从介绍某高压断路器传动机构的工作原理入手,并对断路器机械特性的测试结果进行分析,其次论述传动机构刚性差对断路器动作特性的影响,提出提高传动机构刚性的有效措施,最后通过提高传动机构刚性后的试验结果进行验证。
王永良, 彭新奇, 程铁汉, 张博
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