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A retroactive approach to microgrid real-time scheduling in quest of perfect dispatch solution

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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1608-1618页

作者： Youwei JIA Xue LYU Chun sing.LAI Zhao XU Minghua CHEN Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhenChina Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Electrical Engineering School of AutomationGuangdong University of TechnologyGuangzhouChina School of Civil Engineering Faculty of EngineeringUniversity of LeedsLeedsUK The Chinese University of Hong Kong Hong KongChina

As an emerging paradigm in distributed power systems,microgrids provide promising.solutions to local renewable energy generation and load demand ***,the intermittency of renewables and temporal uncertainty in electrical load create great challenges to energy scheduling,especially for small-scale *** of deploying stochastic models to cope with such challenges,this paper presents a retroactive approach to real-time energy scheduling,which is prediction-independent and computationally *** case studies were conducted using.3-year-long real-life system data,and the results of simulations show that the cost difference between the proposed retroactive approach and perfect dispatch is less than 11%on average,which suggests better performance than model predictive control with the cost difference at 30%compared to the perfect dispatch.

关键词： Microgrid Renewables Real-time scheduling Perfect dispatch Grid integration

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由栽培大豆和***亚属间杂种回交得到的可育植株

国外农学（油料作物） 1994年第4期 12-15页

作者： sing.,GJ 李洪杰

H-plasma-assisted aluminum induced crystallization of amorphous silicon

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Journal of Semiconductors 2012年第6期33卷 125-128页

作者：李娟刘宁罗翀孟志国熊绍珍 Hoi sing.Kwok Institute of Photo-Electronics Nankai UniversityTianjin Key Laboratory for Photo-Electronic Thin Film Devices and Technology Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology

A technique to improve and accelerate aluminum induced crystallization（AIC） by using.hydrogen plasma is *** spectroscopy and secondary ion mass spectrometry of crystallized poly-Si thin films show that hydrogen plasma radicals reduce the crystallization time of *** technique shortens the annealing time from 10 to 4 h and increases the Hall mobility from 22.1 to 42.5 cm^2/（V·s）.The possible mechanism of AIC assisted by hydrogen radicals is also discussed.

关键词： poly-silicon H-plasma aluminum induced crystallization

Noise robustness of an operational modal-based structural damage-detection scheme using.impact-synchronous modal analysis

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浙江大学学报(英文版)A辑:应用物理与工程 2023年第9期24卷 782-800页

作者： Pei Yi SIOW Zhi Chao ONG Shin Yee KHOO Kok-sing.LIM Department of Mechanical Engineering Faculty of EngineeringUniversiti MalayaKuala Lumpur 50603Malaysia Photonics Research Centre Deputy Vice Chancellor(Research and Innovation)OfficeUniversiti MalayaKuala Lumpur 50603Malaysia

Data-driven damage-detection schemes are usually unsupervised machine-learning models in practice,as these do not require any ***-based features are commonly used in these schemes but often require several other parameters to accurately correlate with damage,as they may not globally represent the model,making them less sensitive to *** data,such as frequency response functions(FRFs)and principal component analysis(PCA)reduced FRFs(PCA-FRFs),inherits the dynamic characteristics of the structure,and it changes when damage occurs,thus showing sensitivity to ***,noise from the environment or external sources such as wind,operating machines,or the in-service system itself,can reduce the modal data's sensitivity to damage if not handled properly,which affects damage-detection *** study proposes a noise-robust operational modal-based structural damage-detection scheme that uses impact-synchronous modal analysis(ISMA)to generate clean,static-like FRFs for damage *** allows modal data collection without requiring shutdown conditions,and its denoising.feature aids in generating clean,static-like FRFs for damage *** results showed that the FRFs obtained through ISMA under noise conditions have frequency response assurance criterion(FRAC)and cross signature assurance criterion(CSAC)scores greater than 0.9 when compared with FRFs obtained through experimental modal analysis(EMA)under static conditions;this validates the denoising.feature of *** the denoised FRFs are reduced to PCA-FRFs and used in an unsupervised learning-based damage-detection scheme,zero false alarms occur.

关键词： Impact-synchronous modal analysis(ISMA) Frequency response function(FRF) Principal component analysis(PCA) Unsupervised learning Damage detection

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我路过海的时候海不说话

男生女生（银版） 2009年第8期 12-15页

作者：龟心似贱 sing.久

我路过山的时候山不说话，我路过海的时候海不说话。我路过你的时候你叫住我，给了我一场此生最绚烂的烟花。

关键词：小说文学作品《我路过海的时候海不说话》现代文学

Synergetic analysis of springtime air pollution episodes over Gwangju,Korea

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Journal of Environmental Sciences 2017年第7期29卷 270-283页

作者： Sung-Kyun Shin Kwon-Ho Lee Seung-Shik Park Man sing.Wong Research Institute for Radiation-Satellite(RIRS) Gangneung-Wonju National University(GWNU)Gangneung 25457Republic of Korea Department of Atmospheric and Environmental Sciences(DAES) Gangneung-Wonju National University(GWNU)Gangneung 25457Republic of Korea Department of Environment and Energy Engineering Chonnam National UniversityGwangju 61186Republic of Korea Department of Land Surveying and Geo-Informatics The Hong Kong Polytech UniversityKowloonHong Kong

The characteristics of springtime aerosols,including their optical and microphysical properties,were analyzed for the months of March to May of 2009 in Gwangju（35.23°N,126.84°E）,Korea.A high Light Detection and Ranging（LIDAR）-derived aerosol depolarization ratio（δ） of 0.25 ± 0.04 was determined on dust particles during the observation ***？ngstr？m exponent values of the 440–870 nm wavelength pair（？_（440–870）） and sing.e-scattering albedo at 675 nm（Ω_（675）） measured by a CIMEL sun/sky radiometer were 0.77 ± 0.19 and 0.95 ±0.01,*** elevated dust layers reached a maximum elevation of 4 km above sea ***/smoke particles that originated from highly populated/industrialized regions could be distinguished by their relatively smaller particle size（？_（440–870） ranged between1.33 and 1.36） and higher light-absorbing（Ω_（675） of 0.92 ± 0.01） *** aerosols are mostly distributed at altitudes 〈 1.2 *** root-mean-square deviation（RMSD） between the aerosol optical depth（AOD,τ） derived from LIDAR_（（τ_（LIDAR））） and from the CIMEL sun/sky radiometer_（（τ_（CIMEL））） varied with respect to the surface PM10 *** RMSD between τ_（LIDAR） and τ_（CIMEL） was as low as 13% under lower PM_（10） concentration levels（〈 100 μg/m^3）.In contrast,the RMSD between τ_（LIDAR） and τ_（CIMEL） increased three times（~31%） under high surface PM_（10） concentration levels（〉100 μg/m^3）.These results suggest that the accuracy of τ_（LIDAR） is influenced by specific atmospheric conditions,regardless of its uncertainty.

关键词： LIDAR Sun/sky radiometer MODIS Optical/microphysical properties Aerosol optical depth

Fractal dimension and thermodynamic fluctuation properties of IDV light curves

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Research in Astronomy and Astrophysics 2011年第9期11卷 1031-1045页

作者： Chun-sing.Leung Jian-Yan Wei Zoltan Kovlics Tiberiu Harko National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Department of Physics and Center for Theoretical and Computational Physics The University ofHong Kong Pok Fu Lam Road Hong Kong Hong Kong SAR China

Fractals are a basic tool for phenomenologicalty describing natural ob- jects having a high degree of temporal or spatial variability. From a physical point of view the fractal properties of natural systems can also be interpreted by using.the standard formalism of thermodynamical fluctuations. We introduce and analyze the fractal dimension of the Intra-Day-Variability （IDV） light-curves of BL Lac objects, in the optical, radio and X-ray bands. A general description of the fluctuation spec- trum of these systems based on general thermodynamical principles is also proposed. Based on the general fractal properties of a given physical system, we also introduce the predictability index for the IDV light curves. We have explicitly determined the fractal dimension for the R-band observations of five blazars, as well as for the ra- dio band observations of the compact extragalactic radio source J 1128＋5925 and of several X-ray sources. Our results show that the fractal dimension of the optical and X-ray observations indicates an almost pure ＂Brownian noise＂（random walk） spectrum, with a very low predictability index, while in the radio band the predictability index is much higher. We have also studied the spectral properties of the IDV light curves and we have shown that their spectral index is very closely correlated with the corresponding fractal dimension.

关键词： galaxies -- quasars: emission lines -- instabilities -- gravitation

Complete Solution of Sun Tracking for Heliostat

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Communications in Theoretical Physics 2006年第1期45卷 165-166页

作者： CHEN Ying-Tian LIM Boon-Han LIM Chern-sing Department of Astronomy and Applied Physics University of Science and Technology of China Hefei 230026 China

A general solution of sun tracking for an arbitrarily oriented heliostat towards an arbitrarily located target on the earth is published. With the most general form of solar tracking formulae, it is seen that the used azimuthelevation, spinning-elevation tracking formulae etc. are the special cases of it. The possibilities of utilizing the general solution and its significance in solar energy engineering are discussed.

关键词： solar tracking azimuth-elevation spinning-elevation optical aberration heliostat

Geodesic metrics on fractals and applications to heat kernel estimates

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Science China Mathematics 2023年第5期66卷 907-934页

作者： Qingsong Gu Ka-sing.Lau Hua Qiu Huo-Jun Ruan Department of Mathematics Nanjing UniversityNanjing 210093China Department of Mathematics The Chinese University of Hong KongHong KongChina Department of Mathematics University of PittsburghPittsburghPA 15217USA School of Mathematical Sciences Zhejiang UniversityHangzhou 310027China

It is well known that for a Brownian motion, if we change the medium to be inhomogeneous by a measure μ, then the new motion(the time-changed process) will diffuse according to a different metric D(·, ·).In 2009, Kigami initiated a general scheme to construct such metrics through some self-similar weight functions g on the symbolic space. In order to provide concrete models to Kigami’s theoretical construction, in this paper,we give a thorough study of his metric on two classes of fractals of primary importance: the nested fractals and the generalized Sierpinski carpets;we further assume that the weight functions g := ga are generated by“symmetric” weights a. Let M be the domain of a such that Dgadefines a metric, and let S be the boundary of M. One of our main results is that the metrics from ga satisfy the metric chain condition if and only if a ∈ *** determine M and S, we provide a recursive weight transfer construction on the nested fractals, and a basic symmetric argument on the Sierpinski carpet. As an application, we use the metric chain condition to obtain the lower estimate of the sub-Gaussian heat kernel. This together with the upper estimate obtained by Kigami allows us to have a concrete class of metrics for the time change, and the two-sided sub-Gaussian heat kernel estimate on the fundamental fractals.

关键词： Brownian motion heat kernel metric chain condition nested fractal quasisymmetry resistance metric Sierpinski carpet weight function