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Transient performance comparison of grid-forming converters with different FRT control strategies
《能源前沿(英文)》 2023年 第17卷 第2期 页码 239-250 doi: 10.1007/s11708-022-0856-2
关键词: grid-forming converters (GFMs) fault ride through (FRT) transient stability transient inrush current transient modeling
智能电网广域输电系统可视化 Artical
Thomas J. Overbye,James Weber
《工程(英文)》 2015年 第1卷 第4期 页码 466-474 doi: 10.15302/J-ENG-2015098
安装大量新型传感器和通信设备,并修建用于储存和管理这些设备收集的数据的计算基础设施,是建立输电系统“智能电网”的第一步。对设备进行大量投资之后,当前的关注点是开发大规模数据集的分析和可视化方法。大量新数据的最直接的应用是数据可视化。本文介绍了过去数年内电力行业针对数据可视化所开展的一些可视化技术的调研。这些技术包括饼图技术、动画技术、等高线技术、时变图技术、基于地理的显示技术、图像融合技术和数据聚合技术。本文还着重介绍了“迷你图”新概念,用这种相当于文字大小的图形显示大量时变数 据是一种极为有效的方法。
《机械工程前沿(英文)》 2021年 第16卷 第3期 页码 593-606 doi: 10.1007/s11465-021-0636-4
关键词: topology optimization solid isotropic material with penalization transient response aggregation function second-order Arnoldi reduction
与运行状态无关的电力系统安全域的理论和方法概述 Feature Article
余贻鑫, 刘艳丽, 秦超, 杨添剀
《工程(英文)》 2020年 第6卷 第7期 页码 754-777 doi: 10.1016/j.eng.2019.11.016
在电力系统的一系列最优化问题中,如何综合地考虑潮流约束和各种稳定性约束,而又不影响计算速度,始终还是个难题。至于概率安全性评估的计算负担就更加难以想象。为了解决此类问题,本文提出了安全域(SR)的方法论,该方法论是在经典的逐点法基础上发展起来的全新方法论。天津大学自20世纪80年代开始并长期坚持安全域的研究,至今取得了如本文所述的一系列原创成果。本文所介绍的安全域主要是定义在功率注入空间上的,包括确保静态安全、暂态稳定、静态电压稳定和小扰动稳定的安全域。对于既定的网络拓扑(以及暂态事故的发生地点和清除过程)和系统元件参数,它们是唯一确定的,并且与运行状态无关。本文通过11个命题和相应的注释,简明而系统地介绍了这些电力系统安全域的基本概念、构成、动力学性质、拓扑学与几何学特征、实用边界的实用数学描述及其快速计算方法,以期为成体系地认知安全域方法学、开展后续研究与应用提供支持。在拓扑学与几何学特征方面,最重要的发现是,在功率注入空间上,在工程实际所关心的范围内,安全域的边界可用一个或少数几个超平面的并集表示。基于该特征,电力系统安全约束优化问题和概率安全性评估(风险分析)的计算时间可以按数量级减少。
Development of new transient liquid phase system Au-Sn-Au for microsystem technology
Kirsten BOBZIN, Nazlim BAGCIVAN, Lidong ZHAO, Stefania FERRARA, Jan PERNE
《机械工程前沿(英文)》 2010年 第5卷 第4期 页码 370-375 doi: 10.1007/s11465-010-0107-9
关键词: transient liquid phase microtechnology soldering diffusion physical vapor deposition (PVD)
Sensitivity analysis and numerical experiments on transient test of compact heat exchanger surfaces
REN Hesheng, LAI Lingjun, CUI Yongzheng
《能源前沿(英文)》 2008年 第2卷 第4期 页码 374-380 doi: 10.1007/s11708-008-0079-1
关键词: coefficient dimensionless longitudinal longitudinal temperature conduction
State identification of home appliance with transient features in residential buildings
《能源前沿(英文)》 2022年 第16卷 第1期 页码 130-143 doi: 10.1007/s11708-022-0822-z
关键词: nonintrusive load monitoring (NILM) load disaggregation online load disaggregation Kalman filtering factorial hidden Markov model (FHMM) Labeled hIgh-Frequency daTaset for Electricity Disaggregation (LIFTED)
Linjia BAI, Yunfeng ZHANG
《结构与土木工程前沿(英文)》 2012年 第6卷 第3期 页码 199-209 doi: 10.1007/s11709-012-0168-4
关键词: collapse dynamic response fragility analysis Monte Carlo simulation wind load
YU Xiaobing, DAI Hong, LU Yingyi, LONG Li
《医学前沿(英文)》 2007年 第1卷 第4期 页码 405-409 doi: 10.1007/s11684-007-0079-2
关键词: intraocular pressure fluorescein fundus transient treatment Transient intraocular number
Ping ZHANG, Guoliang DING
《能源前沿(英文)》 2010年 第4卷 第4期 页码 535-541 doi: 10.1007/s11708-010-0113-y
关键词: algorithm convergence heat exchanger modeling transient
null
《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 156-167 doi: 10.1007/s11465-014-0297-7
A fast compound direct iterative algorithm for solving transient line contact elastohydrodynamic lubrication (EHL) problems is presented. First, by introducing a special matrix splitting iteration method into the traditional compound direct iterative method, the full matrices for the linear systems of equations are transformed into sparse banded ones with any half-bandwidth; then, an extended Thomas method which can solve banded linear systems with any half-bandwidth is derived to accelerate the computing speed. Through the above two steps, the computational complexity of each iteration is reduced approximately from O(N3/3) to O(β2N), where N is the total number of nodes, and β is the half-bandwidth. Two kinds of numerical results of transient EHL line contact problems under sinusoidal excitation or pure normal approach process are obtained. The results demonstrate that the new algorithm increases computing speed several times more than the traditional compound direct iterative method with the same numerical precision. Also the results show that the new algorithm can get the best computing speed and robustness when the ratio, half-bandwidth to total number of nodes, is about 7.5%–10.0% in moderate load cases.
关键词: elastohydrodynamic lubrication transient line contact matrix splitting iteration method the Thomas method
Boa Jin, Hyunmin Park, Yang Liu, Leijing Liu, Jongdeok An, Wenjing Tian, Chan Im
《化学科学与工程前沿(英文)》 2021年 第15卷 第1期 页码 164-179 doi: 10.1007/s11705-020-1976-z
关键词: charge-carrier photogeneration transient photocurrent polymer solar cells charge-carrier extraction space charge-limited current
Zhen-Pei WANG, Zhifeng XIE, Leong Hien POH
《机械工程前沿(英文)》 2020年 第15卷 第2期 页码 279-293 doi: 10.1007/s11465-019-0575-5
关键词: isogeometric shape optimization design-dependent boundary condition transient heat conduction implicit time integration adjoint method
null
《医学前沿(英文)》 2011年 第5卷 第1期 页码 86-93 doi: 10.1007/s11684-011-0118-x
Netrin-1 (NT-1) is one of the axon-guiding molecules that are critical for neuronal development. Because of its structural homology to the endothelial mitogens, NT-1 may have similar effects on vascular network formation. NT-1 was shown to be able to stimulate the proliferation and migration of human cerebral endothelial cells in vitro and also promote focal neovascularization in adult brain in vivo. In the present study, we reported the delivery of NT-1 using an adeno-associated virus (AAV) vector (AAV-NT-1) into mouse brain followed by transient middle cerebral artery occlusion (tMCAO). We found that AAV vectors did not elicit a detectable inflammatory response, cell loss or neuronal damage after brain transduction. The level of NT-1 was increased in the AAV-NT-1-transduced tMCAO mice compared with the control mice. Furthermore, the neurobehavioral outcomes were significantly improved in AAV-NT-1-transduced mice compared with the control animals (P<0.05) 7 days after tMCAO. Our data suggests that NT-1 plays a neuronal function recovery role in ischemic brain and that NT-1 gene transfer might present a valuable approach to treat brain ischemic disorders.
关键词: adeno-associated virus angiogenesis gene transfer ischemia middle cerebral artery occlusion netrin-1
崔秀国,张劲军
《中国工程科学》 2003年 第5卷 第7期 页码 77-83
我国生产的原油大多为含蜡原油,加热输送是含蜡原油的主要输送方式。埋地热含蜡原油管道的运行中涉及若干复杂的非稳态传热问题。从管内原油传热(内部传热)和管道与外部环境的传热(外部传热)两方面,分析和总结了含蜡原油管道非稳态传热问题的研究现状,介绍了管道在土壤中传热的影响因素,比较了其各种解析和数值解法,阐述了管道停输状态下管内含蜡原油相变传热的规律及研究方法,讨论了非稳定流动状态下管内油流的水力—热力耦合问题及求解方法,指出了埋地热含蜡原油管道的非稳态传热方面需进一步研究的问题。
标题 作者 时间 类型 操作
Transient performance comparison of grid-forming converters with different FRT control strategies
期刊论文
Topology optimization of transient problem with maximum dynamic response constraint using SOAR scheme
期刊论文
Development of new transient liquid phase system Au-Sn-Au for microsystem technology
Kirsten BOBZIN, Nazlim BAGCIVAN, Lidong ZHAO, Stefania FERRARA, Jan PERNE
期刊论文
Sensitivity analysis and numerical experiments on transient test of compact heat exchanger surfaces
REN Hesheng, LAI Lingjun, CUI Yongzheng
期刊论文
Collapse fragility assessment of steel roof framings with force limiting devices under transient wind
Linjia BAI, Yunfeng ZHANG
期刊论文
Photodynamic therapy combined with intravitreal injection of triamcinolone acetonide for choroidal neovascularization
YU Xiaobing, DAI Hong, LU Yingyi, LONG Li
期刊论文
Predictor-corrector algorithm for solving quasi-separated-flow and transient distributed-parameter model
Ping ZHANG, Guoliang DING
期刊论文
A fast compound direct iterative algorithm for solving transient line contact elastohydrodynamic lubrication
null
期刊论文
Charge-carrier photogeneration and extraction dynamics of polymer solar cells probed by a transient photocurrent
Boa Jin, Hyunmin Park, Yang Liu, Leijing Liu, Jongdeok An, Wenjing Tian, Chan Im
期刊论文
An isogeometric numerical study of partially and fully implicit schemes for transient adjoint shape sensitivity
Zhen-Pei WANG, Zhifeng XIE, Leong Hien POH
期刊论文
Overexpression of netrin-1 improves neurological outcomes in mice following transient middle cerebral
null
期刊论文