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12篇 您的检索式:作者名="N.Jiang"
    题名 作者 年代 出处 被引量
1美国智能电网和分布式发电重点方向的调研分析显示文摘通过研究美国能源部向国会提交的《智能电网系统报告》及其近年所有与智能电网相关的资助声明及投资,对美国智能电网发展的真正重点及近期目标,尤其是分布式发电在美国智能电网中的地位及发展趋势进行了较为全面细致的分析调研。基于所提出的领域分类和影响指标,对智能电网发展趋势及投资比重的研究结果显示美国智能电网在保证电力系统稳定和安全的前提下,主要投资用于解决与配电相关的一系列技术问题。卢永 甘德强 John N.JIANG 2010电力系统自动化2010,34,9:29
2电力系统多级负荷预测及其协调问题 (二)基本协调模型显示文摘电力负荷预测是一个包含空间、时间、属性等多维度多级别的复杂体系。文中针对具有'直接加和'特性的多级负荷预测问题,借鉴电力系统状态估计思想,建立了多级负荷预测的基本协调模型,提出了相应的基本协调方法。在基本协调模型中引入预测可信度的概念,详细分析和比较了不同可信度情况下基本模型的协调结果。引入调整系数和相对调整系数的概念,阐明了基本协调方法的物理机理。为便于比较不同协调方法的协调效果,提出了协调效果的单项评价指标及综合评价标准。最后指明了基本协调模型的应用场合,并用实例验证了所提出的方法的有效性。牟涛 康重庆 夏清 John N.JIANG 刘梅 2008电力系统自动化2008,32,8:18
3电力系统多级负荷预测及其协调问题 (三)关联协调模型显示文摘考虑到多级负荷预测协调的关联特性,将多级负荷预测的基本协调模型扩展为多维多级。首先针对典型的2维2级协调问题,建立了关联协调的标量模型和矩阵模型,并提出了相应的关联协调方法。引入了不平衡向量和调整系数矩阵的新概念,从而阐明了2维2级关联协调方法的物理机理。为便于比较不同协调方法的协调效果,文中继承和扩展了基本协调模型的评价标准,提出了关联协调模型的单项评价指标和综合评价标准。最后,通过实例验证了关联协调模型的协调效果。牟涛 康重庆 夏清 John N.JIANG 刘梅 2008电力系统自动化2008,32,9:15
4以高压电极式电锅炉为核心的高性能分布式电热能源系统显示文摘在发展高比例可再生能源电力系统的愿景中,除了大规模提高可再生能源利用率、建设连接各类能源的电网体系之外,发展分布式电热能源系统,促进用户从'负荷侧'支持电网运行也是一个重要的技术手段。本文对高性能分布式电热能源系统在发展未来高比例可再生能源电力系统中的价值、作用和挑战进行了深入探讨。分析了目前发展较快的一类高性能分布式电热能源系统在丹麦、德国等地的商业应用实例,讨论了其技术特点以及工程应用的技术经济条件。最后展望了高性能分布式电热能源系统在我国的应用前景和发展思路,并结合深圳电网实际情况分析了其应用价值,给出了推广建议。康重庆 陈辉 赵宇明 韩兵 高峰 杨经纬 Ton Verra Huibert John N.Jiang 2017南方电网技术2017,11,10:10
5大型风电场的风能损失计算显示文摘大型风电场由于风机数量众多,各台运转的风机之间的相互干扰作用会影响风机的有功输出,从而造成风电场的风能损失。风能损失将直接影响风电场投入运行后的年度发电能力、发电计划安排以及风电场的运行控制。文中提出了一种新的迭代回归计算方法,可有效分离风机的正常输出和非正常输出,从而正确估算风机的理想输出曲线,并定量计算风电场的风能损失,可服务于已并网的大型风电场。最后,结合实际数据对某风电场的风能损失进行了计算和分析。庄晓丹 John N.JIANG 2009电力系统自动化2009,33,12:9
6AlN/S i(100)上CVD SiC薄膜的光致发光谱显示文摘本工作用化学气相淀积方法在A lN/S i(100)复合衬底上生长S iC薄膜。外延生长过程中,采用C4H4和S iH4作为反应气源,H2作为载气。样品的X-射线衍射谱和拉曼散射谱显示,所得到的外延层为六角对称的S iC薄膜。俄歇电子能谱及X-射线光电子能谱的测量结果表明,在外延膜中存在来自衬底的A l和N元素。样品的光致发光测量显示,所有的样品均可在室温下观察到位于3.03 eV和3.17 eV处的发光峰,这分别相应于4H-S iC能带中电子从导带到A l受主能级之间的辐射跃迁和电子从N施主能级到价带之间的辐射跃迁,从而表明所得的外延薄膜的多形体为4H-S iC。秦臻 韩平 韩甜甜 鄢波 李志兵 谢自力 朱顺明 符凯 刘成祥 王荣华 李云菲 S.Xu N.Jiang 顾书林 张荣 郑有炓 2005人工晶体学报2005,34,6:2
7查看详情显示文摘Z.Zhang M.Wang Z.Li N.Jiang S.Hao J.Gong H.Hu 0,,509:1
8Fast Screening Severe Cyber Attacks via Transient Energy-based Impact Analysis显示文摘This paper presents a transient energy based screening approach for quickly identifying potential critical attacks that might have significant impacts on power system transient stability.Specifically,the proposed approach focuses on the total transient energy injected into power systems as the result of assumptive cyber attacks.The computational improvements of the proposed method are significant as the time-domain simulations can be avoided.The efficacy of the proposed approach is demonstrated using a practical power system with various cyber attack scenarios.The identification results of the proposed method can be used to guide more detailed impact analysis and to develop more effective countermeasures against cyber attacks.Di Wu Feng Ma Milad Javadi John N.Jiang 2016CSEE Journal of Power and Energy Systems2016,2,3:1
9An Algorithm for Practical Power Curve Estimation of Wind Turbines显示文摘Practical power curve estimation is necessary for evaluating the actual power output of a wind farm;since a power curve provided by the wind turbine manufacture will be different with the actual power curve following several years of operation.It can be estimated using the collected power output data including wind power generation and wind speed.This data is commonly ill-distributed due to a noticeable number of outliers,which impose a serious bias to the estimation models obtained from this data.It introduces an interesting challenge in estimation of a power curve.In this paper,an intelligent algorithm is proposed for estimating a power curve using the measured data while modeling and bias errors,imposed to the estimation model by the outliners,are minimized.More specifically,this algorithm is designed based on the Statistical Analysis Software(SAS)programming software package in order to facilitate analyzing and managing big datasets of wind speed and wind power generation.The effectiveness and practical application of the proposed algorithm is demonstrated using a real-world dataset.Milad Javadi Alexander M.Malyscheff Di Wu Chongqing Kang John N.Jiang 2018CSEE Journal of Power and Energy Systems2018,4,1:1
10Artifact analysis of a far-field coded-aperture gamma camera extended to partially coded field-of-view显示文摘Purpose Coded-aperture gamma cameras play an important role for homeland security nowadays.They have limitedfield-of-view(FOV)which is a critical parameter for many applications.The FOV can be potentially increased by extending it to the penumbra area(partially coded FOV).Methods In this study,we analyzed this artifact phenomenon based on simulating a commercial coded-aperture gamma camera.The camera uses a modified uniformly redundant array(MURA)mask with a basic pattern of rank 11.Its opening angle of the basic pattern to the detector center is 26.36◦which is the commonly used non-artifact FOV(NAFOV).In some applications,the radiation source is a far-field single-point source.Thus,we extend its FOV to 40◦by including a part of the partially coded area,which is a trade-off between the FOV and image quality.Analytical calculations and simulation studies were carried out.The system matrix was calculated using the Sidden’s algorithm.The maximum likelihood expectation maximization(MLEM)reconstruction method was employed.Projections and reconstruction results of the point source at different positions were compared.The second moment of inertia was used as thefigure of merit.Results Results show that projections have periodic similarity with a period of NAFOV,and reconstructions also have periodic artifacts,i.e.,fromθtoθ+NAFOV.Artifacts are the most serious at the edge of the NAFOV.The upper and lower artifacts are more serious than the left and right artifacts due to the difference between the horizontal centerline(tungsten)and vertical centerline(holes expect the center unit)of the mask.Conclusions For a point source with high activity,artifacts can be reduced by increasing the iteration number of the MLEM reconstruction.Even at the edge of NAFOV,the point source can be possibly reconstructed thanks to the large size of the position sensitive detector(PSD)used.The noise will significantly increase artifacts,which may lead to error locate the point source with low activity at some specific positions.Q.W XLiu Z.Zhang N.Jiang Y.Hou H.Zhang Y.Ji L.Sun Y.Xia 2022Radiation Detection Technology and Methods2022,6,4:0
11Complementary Phenotyping of Maize Root System Architecture by Root Pulling Force and X-Ray Imaging显示文摘The root system is critical for the survival of nearly all land plants and a key target for improving abiotic stress tolerance,nutrient accumulation,and yield in crop species.Although many methods of root phenotyping exist,within field studies,one of the most popular methods is the extraction and measurement of the upper portion of the root system,known as the root crown,followed by trait quantification based on manual measurements or 2D imaging.However,2D techniques are inherently limited by the information available from single points of view.Here,we used X-ray computed tomography to generate highly accurate 3D models of maize root crowns and created computational pipelines capable of measuring 71 features from each sample.This approach improves estimates of the genetic contribution to root system architecture and is refined enough to detect various changes in global root system architecture over developmental time as well as more subtle changes in root distributions as a result of environmental differences.We demonstrate that root pulling force,a high-throughput method of root extraction that provides an estimate of root mass,is associated with multiple 3D traits from our pipeline.Our combined methodology can therefore be used to calibrate and interpret root pulling force measurements across a range of experimental contexts or scaled up as a stand-alone approach in large genetic studies of root system architecture.M.R.Shao N.Jiang M.Li A.Howard K.Lehner J.L.Mullen S.L.Gunn J.K.McKay C.N.Topp 2021Plant Phenomics2021,3,1:0
12新型氧离子导体稳定氧化铋的中子衍射显示文摘新型氧离子导体稳定氧化铋 (Dy2 O3) 0 .15-x(WO3) x(Bi2 O3) 0 85样品具有很高的电导率 ,当x=0 .7时 ,样品在 650℃经过 12 0 0h老化仍不发生相变。用中子衍射技术研究其结构 ,发现氧离子在 32f晶位占位数随着x的变化有一极大值 ,这时晶体结构趋向于氧离子由 8c晶位向 32f晶位移动。由于这时的 2 4e 32f键长最短 ,结构极其稳定。李际周 杨继廉 刘蕴韬 肖红文 N.Jiang H.Luo 2000原子能科学技术2000,34,z1:0
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