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A Linearized branch Flow Model Considering Line Shunts for Radial Distribution Systems and Its Application in Volt/VAr Control

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Journal of Modern Power Systems and Clean Energy 2023年第4期11卷 1191-1200页

作者： Hanyang Lin Firdous ul Nazir bikash C.pal Ye Guo Tsinghua-berkeley Shenzhen Institute Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518071China Department of Electrical and Electronic Engineering Glasgow Caledonian UniversityGlasgow Caledonian UniversityGlasgowG4 OBAU.K. Department of Electrical and Electronic Engineering Imperial College LondonLondonSW72AZU.K.

When urban distribution systems are gradually modernized,the overhead lines are replaced by underground cables,whose shunt admittances can not be *** power flow(PF)model withπequivalent circuit shows non-convexity and long computing time,and most recently proposed linear PF models assume zero shunt *** of them are not suitable for fast calculation and optimization problems of modern distribution systems with non-negligible line ***,this paper proposes a linearized branch flow model considering line shunt(LbFS).The strength of LbFS lies in maintaining the linear structure and the convex nature after appropriately modeling theπequivalent circuit for network equipment like *** results show that the calculation accuracy in nodal voltage and branch current magnitudes is improved by considering shunt *** show the application scope of LbFS by controlling the network voltages through a two-stage stochastic Volt/VAr control(VVC)problem with the uncertain active power output from renewable energy sources(RESs).since LbFS results in a linear VVC program,the global solution is *** study exhibits that VVC framework can optimally dispatch the discrete control devices,*** transformers and shunt capacitors,and also optimize the decision rules for real-time reactive power control of ***,the computing efficiency is significantly improved compared with that of traditional VVC methods.

关键词： Line shunt linear power flow model stochastic optimization Volt/VAr control(VVC)

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A brief overview of synthetic biology research programs and roadmap studies in the united States

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Synthetic and Systems biotechnology 2016年第4期1卷 258-264页

作者： Tong si Huimin Zhao Carl R.Woese Institute for Genomic biology University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Departement of Chemical and biomolecular Engineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Chemistry University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of biochemistry University of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of bioengineering University of Illinois at Urbana-ChampaignUrbanaIL 61801USA

The united States is a leading nation in the development of synthetic biology,an emerging engineering discipline to create,control and reprogram biological *** strategic investment from its government agencies,the *** established numerous research centers and programs in synthetic biology,enabling significant advances in foundational tool development and practical applications ranging from bioenergy,biomanufacturing,to *** maintain its leadership in synthetic biology,u.S,has conducted several roadmap studies to provide strategic visions and action *** we will provide a brief overview of the major research programs and roadmap studies of synthetic biology in the u.S.

关键词： synthetic maintain brief

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俄罗斯森林采运机械的发展趋势

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森林采运科学 1994年第3期10卷 61-62,38页

作者：斯诗里欣b.u 李云成俄罗斯西件利亚工艺学院中国南京林业大学

本文以介绍俄罗斯采运专家如何看待俄国采运机械的发展趋势为中心,向读者传达一个信息,即在苏联解体后出现于俄罗斯的一个社会现象——普遍的反思和对过去的全盘否定。这种现象不仅存在于政治生活,也存在于经济和科学技术领域。中国同... 详细信息

本文以介绍俄罗斯采运专家如何看待俄国采运机械的发展趋势为中心,向读者传达一个信息,即在苏联解体后出现于俄罗斯的一个社会现象——普遍的反思和对过去的全盘否定。这种现象不仅存在于政治生活,也存在于经济和科学技术领域。中国同行带着很大的兴趣观察和研究这一反思,但显不急于给出自己的评价。俄国专家的分析主要建立在机械的自重上,而又没有明确的重量界限,即多大的自重才有害于森林的恢复。俄国专家十分依重所谓的“斯堪的那维亚工艺”,而又缺少对这种工艺形成的环境的分析。而每种工艺和技术又绝不能脱离它自身依懒的环境,自然的、经济的、乃至社会的环境。当然,一篇短文不可能面面具到。本文所反映的一个侧面仍然是有趣的。应当引起大家的注意,乃至讨论。

关键词：俄罗斯森林采运机械发展趋势

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On Evolution Algebras

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Algebra Colloquium 2014年第2期21卷 331-342页

作者： J.M. Casas M. Ladra b.A. Omirov u.A. Rozikov Department of Applied Mathematics E. U.I.T. Forestal Pontevedra University of Vigo 36005 Spain Department of Algebra University of Santiago de Compostela 15782 Spain Institute of Mathematics Tashkent 100125 Uzbekistan

The structural constants of an evolution algebra are given by a quadratic matrix. In this work we establish an equivalence between nil, right nilpotent evolution algebras and evolution algebras defined by upper triangular matrices. The classification of 2-dimensional complex evolution algebras is obtained. For an evolution algebra with a special form of the matrix, we describe all its isomorphisms and their compositions. We construct an algorithm running under Mathematica which decides if two finite dimensional evolution algebras are isomorphic.

关键词： evolution algebra nil algebra right nilpotent algebra group of endomor-phisms classification

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Prediction of the Charpy V-notch impact energy of low carbon steel using a shallow neural network and deep learning

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International Journal of Minerals,Metallurgy and Materials 2021年第8期28卷 1309-1320页

作者： si-wei Wu Jian Yang Guang-ming Cao State Key Laboratory of Advanced Special Steel School of Materials Science and EngineeringShanghai UniversityShanghai 200444China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

The impact energy prediction model of low carbon steel was investigated based on industrial data. A three-layer neural network, extreme learning machine, and deep neural network were compared with different activation functions, structure parameters, and training functions. bayesian optimization was used to determine the optimal hyper-parameters of the deep neural network. The model with the best performance was applied to investigate the importance of process parameter variables on the impact energy of low carbon steel. The results show that the deep neural network obtains better prediction results than those of a shallow neural network because of the multiple hidden layers improving the learning ability of the model. Among the models, the bayesian optimization deep neural network achieves the highest correlation coefficient of 0.9536, the lowest mean absolute relative error of 0.0843, and the lowest root mean square error of 17.34 J for predicting the impact energy of low carbon steel. Among the variables, the main factors affecting the impact energy of low carbon steel with a final thickness of7.5 mm are the thickness of the original slab, the thickness of intermediate slab, and the rough rolling exit temperature from the specific hot rolling production line.

关键词： prediction shallow neural network deep neural network impact energy low carbon steel

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Super-harmonic resonance of gear transmission system under stick-slip vibration in high-speed train

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Journal of Central South university 2017年第3期24卷 726-735页

作者： HuANG Guan-hua Xu si-si ZHANG Wei-hua YANG Cai-jin State Key Laboratory of Traction Power （Southwest Jiaotong university） Chengdu 61003 I China beijing Haidongqing Electrical and Mechanical Equipment Co. Ltd Beijing 101300 China CRRC Institute Co. Ltd Beiiing 100070 China

This work deals with super-harmonic responses and the stabilities of a gear transmission system of a high-speed train under the stick-slip oscillation of the *** dynamic model of the system is developed with consideration on the factors including the time-varying system stiffness,the transmission error,the tooth backlash and the self-excited excitation of the *** frequency-response equation of the system at super-harmonic resonance is obtained by the multiple scales method,and the stabilities of the system are analyzed using the perturbation *** nonlinear behaviors of the system including multi-valued solutions,jump phenomenon,hardening stiffness are *** effects of the equivalent damping and the loads of the system under the stick-slip oscillation are *** shows that the change of the load can obviously influence the resonance frequency of the system and have little effect on the steady-state response amplitude of the *** damping of the system has a negative effect,opposite to the *** synthetic damping of the system composed of meshing damping and equivalent damping may be less than zero when the wheel-set has a large slippage,and the system loses its stability owing to the Hopf *** results are validated by numerical simulations.

关键词： stick-slip vibration super-harmonic resonance Hopf bifurcation gear transmission system high-speed train

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Sustainable graywater reuse for residential landscape irrigation-a critical review

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Chinese Journal of Population,Resources and Environment 2015年第3期13卷 250-264页

作者： u.Pinto b.L.Maheshwari School of Science & Health University of Western Sydney

The demand for potable water is rising rapidly due to an ever-increasing population,economic activities,and dwindling water *** provide adequate water supplies in the future,understanding the issues and challenges in the reuse of water and developing appropriate strategies for reuse will be *** way to augment water supplies for residential use is to reuse graywater- the wastewater from kitchens,bathrooms,and *** this article,we critically review the evolution of water reuse,the definition of graywater,graywater reuse practices,volumes and flow in different situations,and graywater *** then examine the issues associated with different graywater treatment methods and how using graywater for irrigation around homes affects soil quality and plant *** study concludes that graywater treatment costs,human health risks,and its effect on soil quality are some of the challenges that need to be addressed in the future for widespread and sustainable reuse of graywater for irrigation around homes.

关键词： water reuse graywater irrigation sustainability urban water water treatment

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Scale-invariant machine-learning model accelerates the discovery of quaternary chalcogenides with ultralow lattice thermal conductivity

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npj Computational Materials 2022年第1期8卷 455-466页

作者： Koushik pal Cheol Woo Park Yi Xia Jiahong Shen Chris Wolverton Department of Materials Science and Engineering Northwestern UniversityEvanstonIL60208USA

We design an advanced machine-learning(ML)model based on crystal graph convolutional neural network that is insensitive to volumes(i.e.,scale)of the input crystal structures to discover novel quaternary chalcogenides,AMM′Q3(A/M/M'=alkali,alkaline earth,post-transition metals,lanthanides,and Q=chalcogens).These compounds are shown to possess ultralow lattice thermal conductivity(κ_(l)),a desired requirement for thermal-barrier coatings and *** screening the thermodynamic stability of~1 million compounds using the ML model iteratively and performing density-functional theory(DFT)calculations for a small fraction of compounds,we discover 99 compounds that are validated to be stable in *** several DFT-stable compounds,we calculate theirκl using Peierls–boltzmann transport equation,which reveals ultralowκ_(l)(ure)due to their soft elasticity and strong phonon *** work demonstrates the high efficiency of scale-invariant ML model in predicting novel compounds and presents experimental-research opportunities with these new compounds.

关键词： ultralow thermal invariant

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Review of control and guidance technology on hypersonic vehicle

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Chinese Journal of Aeronautics 2022年第7期35卷 1-18页

作者： Yibo DING Xiaokui YuE Guangshan CHEN Jiashun si School of Astronautics Northwestern Polytechnical UniversityXi’an 710072China Shanghai Aerospace Control Technology Institute Shanghai 201109China beijing Reserarch Institute of Automation for Machinery Industry Co. LTD.Beijing 100124China

Air-breathing hypersonic vehicle has great military and potential economic value due to its characteristics:high velocity,long range,quick ***,the development of hypersonic vehicle and its guidance and control technology are reviewed in this ***,the development and classification of hypersonic vehicles around the world are summarized,and the geometric configuration and mission profile of typical air-breathing hypersonic vehicle are ***,the control difficulties of air-breathing hypersonic vehicle are introduced,including integrated design of engine and fuselage,static instability,strong nonlinearity,uncertain aerodynamic parameters,*** to its control requirements,the control methods considering external disturbance,fault-tolerant control methods,anti-saturation methods,and prescribed performance control methods considering transient performance constraints are summarized *** classification and comparison of various control methods are given,and the frontiers of theoretical development are ***,considering the effects of composite disturbances,the design of terminal guidance law under multiple constraints is overviewed,including guidance law with angle constraint,velocity constraint,acceleration constraint and time ***,the classification of guidance law design methods under different constraints,their advantages as well as the future development trend and requirements are introduced.

关键词： Classification of hypersonic vehicles Control equipmentaerospace applications Flight profiles Guidance strategy Hypersonic vehicles

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Development and characterization of a microfluidic glucose sensing system based on an enzymatic microreactor and chemiluminescence detection

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Science China Chemistry 2012年第4期55卷 515-523页

作者： MOON b.-u. de VRIES M.G. WESTERINK b.H.C. VERPOORTE E. biomonitoring and Sensoring Department of Pharmacy University of Groningen Antonius Deusinglaan 1 9713AV Groningen The Netherlands Pharmaceutical Analysis Department of Pharmacy University of Groningen Antonius Deusinglaan 1 9713AV Groningen The Netherlands brains-on-Line PO Box 4030 9713AV Groningen The Netherlands

Chemiluminescence detection was developed as an alternative to amperometric detection for glucose analysis in a portable, microfluidicsbased continuous glucose monitoring system. Amperometric detection allows easy determination of hydrogen peroxide, a product of the glucose oxidasecatalyzed reaction of glucose with oxygen, by oxidation at a microelectrode. However, （micro）electrodes in direct contact with physiological sample are subject to electrode fouling, which leads to signal drift, decreased reproducibility and shortened detector lifetimes. Moreover, there are a few species present in the body （e.g. ascorbic acid, uric acid） which can undergo oxidation at the same applied potential as hydrogen peroxide. These species can thus inter- fere with the glucose measurement, reducing detection specificity. The rationale for exploring chemiluminescence as opposed to amperometric detection is thus to attempt to improve the lifetime and reproducibility of glucose analysis for monitoring purposes, while reducing interference caused by other chemicals in the body. The study reported here represents a first step in this direction, namely the realization of a microfluidic device with integrated silicon photodiode for chemiluminescence detection of glucose. This microflow device uses a chaotic mixing approach to perform enzymatic conversion of glucose, followed by reaction of the hydrogen peroxide produced with luminol to produce light at 425 nm. The chemil reaction is catalyzed by horseradish peroxidase in the presence of iodophenol. The performance of the fabricated chip was characterized to establish optimal reaction conditions with respect to sample and reagent flow rates, pH, and concentrations. A linear calibra- tion curve was obtained for current response as a function of glucose concentration in the clinically relevant range between 2 and 10 mM, with a sensitivity of 39 pA/mM （R = 0.9963, one device, n = 3） and a limit of detection of 230 ktM （S/N - 3）.

关键词： microfluidic chip – glucose sensing system – enzymatic microreactor – chemiluminescence – chaotic mixing

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