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Frontiers in Energy 2023年第2期17卷 211-227页

作者： Hanyi WANG Renjie LUO qun YU Zhiyi li College of Electrical Engineering Zhejiang UniversityHangzhou 310027China

With multiple microgrids(MGs)integrated into power distribution networks in a distributed manner,the penetration of renewable energy like photovoltaic(PV)power generation ***,the operation of power distribution networks is challenged by the issues of multiple power flow directions and voltage ***,an efficient voltage control strategy is needed to ensure voltage security against ever-changing operating conditions,especially when the network topology information is absent or *** this paper,we propose a novel data-driven voltage profile improvement model,denoted as system-wide composite adaptive network(SCAN),which depends on operational data instead of network topology details in the context of power distribution networks integrated with multiple *** existing studies that realize topology identification and decisionmaking optimization in sequence,the proposed end-to-end model determines the optimal voltage control decisions in one *** specifically,the proposed model consists of four modules,Pre-training Network and modified interior point methods with adversarial networks(Modified IPMAN)as core modules,and discriminator generative adversarial network(Dis-GAN)and Volt convolutional neural network(Volt-CNN)as ancillary *** particular,the generator in SCAN is trained by the core modules in sequence so as to form an end-to-end mode from data to *** experiments based on IEEE 33-bus and 123-bus systems have validated the effectiveness and efficiency of the proposed method.

关键词： send-to-end learning microgrids voltage profile improvement generative adversarial network

Flexible High Energy Density Sodium Dual-ion Battery with Long Cycle life

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Energy & Environmental Materials 2022年第4期5卷 1285-1293页

作者： Yongpeng li qun Guan Jianli Cheng Bin Wang Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Institute of Fundamental and Frontiers Sciences Yangtze Delta Region Institute(Huzhou)University of Electronic Sciences and Technology of ChinaChengdu 611731China

Flexible fiber-shaped sodium dual-ion batteries(FSDIBS)as a proof of concept are fabricated by using the hierarchical ReS_(2) nanosheets anchored on the carbon nanotube(ReS_(2)@CNT)fiber as anode and graphite on the CNT as *** to large interlayer spacing and weak layer coupling force of the ReS_(2) nanosheets and the anion accommodation of the graphite combined with good flexibility of the CNT fiber,the FSDIBS demonstrate outstanding electrochemical performances with high working voltage and high specific volumetric energy density,durable cycling life,and good *** FSDIBS show a specific discharge capacity of 97.8 mAh cm^(−3) at a current density of 630 mA cm^(−3) and high specific energy density of 25.12 mWh cm^(−3)(based on the whole volume of the two electrodes)and superb stability with a capacity retention of 91.8%even after bending for 2100 ***,a series of ex situ/in situ characterizations are verified that the reversible shuttles of the Na^(+) cations and PF_(6)^(-) anions between the anode and cathode are simultaneously occurred during the charge/discharge process.

关键词： dual-ion batteries fiber-shaped flexibility ReS_(2) sodium ions

Self-Detection of Leaking Pipes by One-Dimensional Photonic Crystals

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Chinese Physics Letters 2012年第6期29卷 172-174页

作者： ZHOU Yan YIN li-qun Department of Physics Yanshan UniversityQinhuangdao 066004 Educational Administration Hebei Normal University of Science and TechnologyQinhuangdao 066004

We report a new self-detection control system for leaking pipes by making use of the surface defects of 1D photonic crystals,where the key concept is analog to the Bragg fiber *** current low costs and coating techniques of SiO2 are beneficial to the applications,and its error is below the standard *** problem of leaking pipes can be resolved by devising a remote pipeline control system which combines a long-distance pipeline and a signal transmission system.

关键词： fiber Crystal pipes

Deformation resistance of Fe-Mn-V-N alloy under different deformation processes

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Rare Metals 2017年第10期36卷 833-839页

作者： Yun-li Feng Jie li li-qun Ai Bao-Mei Duan College of Metallurgy and Energy North China University of Science and Technology Tangshan 063009 China Key Laboratory of the Ministry of Education for Modem Metallurgy Technology Tangshan 063009 China

The deformation resistance of Fe-Mn-V-N alloy under different deformation conditions was investigated by hot compression method on thermal simulator. Effects of deformation degree, deformation temperature, and strain rate on deformation resistance were analyzed. The results show that when other conditions are constant, the deformation resistance increases with the increase in deformation degree and strain rate and decreases with the increase in deformation temperature. At the same time, the mathematical model of deformation resistance for Fe-Mn- V-N alloy was established by lstOpt software using the Levenberg-Marquardt optimization algorithm carried out on the fitting of regression coefficients, which has higher fitting precision.

关键词： Fe-Mn-V-N alloy Deformation process Deformation resistance Mathematical model

Formation mechanism of an aluminium-based chemical conversion coating on AZ91D magnesium alloy

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International Journal of Minerals,Metallurgy and Materials 2010年第5期17卷 641-647页

作者： Wei-ping li Xi-mei Wang li-qun Zhu Wen li Key Laboratory of Aerospace Materials and Performance （Ministry of Education of China） School of Materials Science and EngineeringBeihang University Beijing 100083 China

An environmentally clean aluminium-based conversion coating on AZ91D magnesium alloy was studied in aluminium nitrate solutions. The morphology, composition, structure, and formation mechanism of the coating were investigated in detail using scanning electron microscopy/energy dispersion spectrometry, X-ray diffraction, transmission electron microscopy, and electrochemical corrosion tests. The results show that the conversion coating is composed of magnesium, aluminium, and oxygen, and shows an amorphous structure. In the initial stage of coating formation, the grain-like nucleus is composed of Al10O15·xH2O, （Al2O3）5.333, Al2O3, AlO（OH）, MgAl2O4, （Mg0.88Al0.12）（Al0.94Mg0.06）2O4, and （Mg0.68Al0.32）（Al0.84Mg0.16）2O4. The conversion coating formed in the 0.01 mol/L aluminium nitrate solution for 15 min can improve the corrosion resistance of the magnesium alloy greatly. The discussion reveals that the possible formation mechanism for the aluminium-based conversion coating is the reduction reaction on micro-cathodic sites due to the electrochemically heterogeneous magnesium alloy substrate.

关键词： magnesium alloys coatings aluminium nitrate corrosion resistance

Soluble ST2:A Novel Biomarker for Diagnosis and Prognosis of Cardiovascular Disease

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Current Medical Science 2024年第4期44卷 669-679页

作者： Yin FENG li-qun HE Department of Cardiology Traditional Chinese and Western Medicine Hospital of WuhanTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430030China

The increasing incidence of cardiovascular disease(CVD)is a significant global health concern,affecting millions of individuals each *** diagnosis of acute CVD poses a formidable challenge,as misdiagnosis can significantly decrease patient survival *** biomarkers have played a vital role in the diagnosis and prognosis of CVDs,but they can be influenced by various factors,such as age,sex,and renal *** ST2(sST2)is a novel biomarker that is closely associated with different *** low reference change value makes it suitable for continuous measurement,unaffected by age,kidney function,and other confounding factors,facilitating risk stratification of ***,the combination of sST2 with other biomarkers can enhance diagnostic accuracy and prognostic *** review aims to provide a comprehensive overview of sST2,focusing on its diagnostic and prognostic value as a myocardial marker for different types of CVDs and discussing the current limitations of sST2.

关键词： soluble ST2 cardiovascular disease combined biomarker diagnosis and prognosis limitations

A Correction Factor-Based General Thermal Resistance Formula for Heat Exchanger Design and Performance Analysis

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Journal of Thermal Science 2021年第3期30卷 892-901页

作者： HAO Junhong CHEN qun li Xia ZHAO Tian Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing 100084China

Methods for the analysis of heat exchangers with various flow arrangements modeling,design,and performance are essential for heat transfer system modeling and its integration with other energy system *** paper proposes the use of the linear-transfer law for the heat exchanger design and performance analysis as a function of the thermal resistance related to the ratio of a linear temperature difference to the total heat transfer ***,we derived a correction factor that represents the influence of the flow arrangement on the heat transfer performance by the effective thermal conductance,as a function of correction factor,heat transfer coefficient,and surface *** on the effective thermal conductance,we propose the hot-end NTU and cold-end NTU for deriving a standardized and general thermal resistance formula for different types of heat exchangers by the combination of the correction factor with linear-transfer ***,for parallel-flow,cross-flow,and 1-2 Tubular Exchanger Manufacturers Association(TEMA)E shell-and-tube heat exchangers,we derived and obtained alternative correction factor expressions without introducing any *** cases about heat exchanger design and performance analysis show that the calculation processes using the correction factor-based general thermal resistance are straightforward without any iteration and the calculation results are ***,the experimental validation shows that the general thermal resistance formula is appropriate for analyzing the heat transfer *** is,the correction factor-based general thermal resistance formula provides a standardized model for heat exchanger analysis and heat transfer/integrated energy system modeling using the heat current method.

关键词： general thermal resistance formula correction factor heat current model linear-transfer law heat exchanger

Roles of Pectin Methylesterases in Pollen-Tube Growth

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Journal of Integrative Plant Biology 2007年第1期49卷 94-98页

作者： li-qun Chen De Ye State Key Laboratory of Plant Physiology and Biochemistry College of Biological Sciences China Agricultural University Beijing 100094 China

Elongation of the pollen tube in pistil is essential for delivering sperms into the female gametophyte in sexual plant reproduction. Recently, a group of cell wall enzymes, pectin methylesterases （PMEs）, have been identified as playing an important role in this process. This article reviews the new understanding of the roles of PMEs in regulating pollen tube growth.

关键词： PME pollen tube male gametophyte sexual plant reproduction Arabidopsis

Isometric Immersions of Higher Codimension in to the Product S~κ×H^(n+p-k)

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Acta Mathematica Sinica,English Series 2014年第12期30卷 2146-2160页

作者： Xing Xiao li Tian qun ZHANG Department of Mathematics He'nan Normal University Luoyang No.43 Middle School

In this paper,we obtain a sufficient and necessary condition for a simply connected Riemannian manifold（M^n,g） to be isometrically immersed,as a submanifold with codimension p 〉 1,into the product S^k×H^n＋p＋k of... 详细信息

关键词： Isometric immersions of higher codimension product structure spheres and hyperboloids

A statistical distribution of quad-pol X-band sea clutter time series acquired at a grazing angle

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Acta Oceanologica Sinica 2018年第3期37卷 94-102页

作者： WANG Yunhua li qun ZHANG Yanmin College of Information Science &Engineering Ocean University of China Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technology

Although the complex Wishart distribution has been widely used to analyze the statistic properties of quad-pol SAR spatial data, the applicability of this complex distribution to the time series of sea clutter is rarely *** measured data of the quad-pol X-band marine radar demonstrate that the time series of the sea echoes are also satisfied the circular Gaussian distributions if the low intensity signals, which are mainly dominated by a radar noise, in the shadow regions of the large-scale waves are removed. On the basis of this fact, the probability density functions（PDFs） of the intensity as well as the phase, the real and the imaginary parts of the sea echoes obtained by the marine radar have been derived, and the theoretical models are all expressed in closed forms. In order to validate the theoretical results, the PDFs are compared with the experimental data collected by the Mc Master IPIX radar. And the comparisons show that the PDF models are in good agreement with the experimental data.

关键词： sea clutter quad-pol coherent X-band radar statistical distribution function