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Smart Grid and Renewable Energy 2024年第1期15卷 34-48页

作者： Yongqi Liu Wei Shi Jiusong Hu Yantao Zhao pang wang College of Railway Transportation Hunan University of Technology Zhuzhou China Wasion Group Co. Ltd. Changsha China

The assessment of the measurement error status of online Capacitor Voltage Transformers (CVT) within the power grid is of profound significance to the equitable trade of electric energy and the secure operation of the power grid. This paper advances an online CVT error state evaluation method, anchored in the in-phase relationship and outlier detection. Initially, this method leverages the in-phase relationship to obviate the influence of primary side fluctuations in the grid on assessment accuracy. Subsequently, Principal Component Analysis (PCA) is employed to meticulously disentangle the error change information inherent in the CVT from the measured values and to compute statistics that delineate the error state. Finally, the Local Outlier Factor (LOF) is deployed to discern outliers in the statistics, with thresholds serving to appraise the CVT error state. Experimental results incontrovertibly demonstrate the efficacy of this method, showcasing its prowess in effecting online tracking of CVT error changes and conducting error state assessments. The discernible enhancements in reliability, accuracy, and sensitivity are manifest, with the assessment accuracy reaching an exemplary 0.01%.

关键词： Capacitor Voltage Transformer Measurement Error Online Monitoring Principal Component Analysis Local Outlier Factor

Two-step accelerated mineral carbonation and decomposition analysis for the reduction of CO_2 emission in the eco-industrial parks

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Journal of Environmental Sciences 2014年第7期26卷 1411-1422页

作者： Seok Jung Li pang wang Gjergj Dodbiba Toyohisa Fujita Department of Systems Innovation Graduate School of Engineering The University of TokyoBunkyo-Ku Tokyo 113-8656 Japan

Carbon dioxide（CO2） emissions are a leading contributor to the negative effects of global warming. Globally, research has focused on effective means of reducing and mitigating CO2 emissions. In this study, we examined the efficacy of eco-industrial parks（EIPs） and accelerated mineral carbonation techniques in reducing CO2 emissions in South ***, we used Logarithmic Mean Divisia Index（LMDI） analysis to determine the trends in carbon production and mitigation at the existing EIPs. We found that, although CO2 was generated as byproducts and wastes of production at these EIPs, improved energy intensity effects occurred at all EIPs, and we strongly believe that EIPs are a strong alternative to traditional industrial complexes for reducing net carbon emissions. We also examined the optimal conditions for using accelerated mineral carbonation to dispose of hazardous fly ash produced through the incineration of municipal solid wastes at these EIPs. We determined that this technique most efficiently sequestered CO2 when micro-bubbling, low flow rate inlet gas, and ammonia additives were employed.

关键词： CO2 emissionsLMDI analysisAccelerated mineral carbonation EIPs

Online Capacitor Voltage Transformer Measurement Error State Evaluation Method Based on In-Phase Relationship and Abnormal Point Detection

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考虑土−结构相互作用的地下室层对高层建筑地震反应影响研究

Smart Grid and Renewable Energy（智能电网与可再生能源） 2024年第1期

作者： Yongqi Liu Wei Shi Jiusong Hu Yantao Zhao pang wang

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岩土力学 2024年第9期45卷 2808-2822页

作者：马建勋 MOHAMMED El Hoseny 庞盼望李文枭闫洪祥西安交通大学人居环境与建筑工程学院陕西西安710054

当前建筑抗震设计中往往忽略了地下室层及土−结构相互作用(soil-structure interaction,简称SSI)效应的影响,研究旨在通过振动台试验和数值模拟,研究考虑SSI效应时不同地下室层数的高层建筑在不同地震作用下的地震反应。首先选择相似系... 详细信息

当前建筑抗震设计中往往忽略了地下室层及土−结构相互作用(soil-structure interaction,简称SSI)效应的影响,研究旨在通过振动台试验和数值模拟,研究考虑SSI效应时不同地下室层数的高层建筑在不同地震作用下的地震反应。首先选择相似系数λ(λ=1:50)进行缩尺模型的振动台试验,以模拟真实建筑的地震反应。为了模拟复杂的结构系统,利用PLAXIS 3D对有无SSI效应的缩尺模型和真实模型分别进行了数值模拟。试验和数值模拟的结果取得了很好的精确度并具有良好的一致性,同时也验证了所选相似系数λ=1:50足以反映不同地震作用下建筑的真实情况。通过对试验和数值模拟的结果进行分析,发现SSI效应和地下室对高层建筑的地震反应的影响显著。虽然目前大多数规范都认为SSI效应会减小建筑的剪力,增加相对侧向位移,但研究发现,在某些情况下SSI效应会增加建筑的剪力和相对侧向位移。

关键词：地下室层土−结构相互作用小型振动台试验地震反应

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Partial Oxidation of Methane to Synthesis Gas over Hexaaluminates LaMAl_(11)O_(19-δ) catalysts

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Journal of Natural Gas Chemistry 2007年第1期16卷 60-63页

作者： Zhanlin Xu Lina Zhao Fang pang Liang wang Chunyan Niu College of Chemistry Jilin Normal University Siping 136000 Jilin China

A series of M-substituted hexaaluminates LaMAl11O19-δ （M=Fe, Co, Ni, Mn, and Cu） were prepared and characterized by XRD, XPS, TPR and TGA techniques, respectively. They exhibited different reducibility and catalytic activity for partial oxidation of methane （POM） to synthesis gas. Among the LaMAl11019-δ samples, LaNiAl11O19-δ showed the best catalytic activity for the topic reaction and selectivity for synthesis gas at 780 ℃ for 2 h. The conversion of CH4 was over 99.2%, and the product selectivity for both CO and H2 was above 90.3%.

关键词： partial oxidation CH4 synthesis gas hexaaluminates LaMAl11 O19-δ Fe Co Ni Mn Cu

Ionic liquid-assisted preparation of hydroxyapatite and its catalytic performance for decarboxylation of itaconic acid

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Chinese Journal of Chemical Engineering 2024年第3期67卷 9-15页

作者： Shutong pang Hualiang An Xinqiang Zhao Yanji wang Hebei Provincial Key Laboratory of Green Chemical Technology and Efficient Energy Saving Tianjin Key Laboratory of Chemical Process SafetySchool of Chemical Engineering and TechnologyHebei University of TechnologyTianjin 300130China

The synthesis of methacrylic acid from biomass-derived itaconic acid is a green route,for it can get rid of the dependence on fossil *** order to solve the problems on this route such as use of a preciousmetal catalyst and a corrosive homogeneous alkali,we prepared a series of hydroxyapatite catalysts by an ionic liquid-assisted hydrothermal method and evaluated their catalytic *** results showed that the ionic liquid[Bmim]BF_(4) can affect the crystal growth of hydroxyapatite,provide fluoride ion for fluorination of hydroxyapatite,and adjust the surface acidity and basicity,morphology,textural properties,crystallinity,and composition of ***[Bmim]BF4 dosage and hydrothermal temperature can affect the fluoride ion concentration in the hydrothermal system,thus changing the degree of fluoridation of *** fluoride-ion concentration can lead to the formation of CaF_(2) and thus significantly decrease the catalytic performance of *** hydrothermal time mainly affects the growth of hydroxyapatite crystals on the c axis,leading to different catalytic *** suitable conditions for the preparation of this fluoridized hydroxyapatite are as follows:a mass ratio of[Bmim]BF4 to calcium salt=0.2:1,a hydrothermal time of 12 h,and a hydrothermal temperature of 130℃.A maximal methacrylic acid yield of 54.7%was obtained using the fluoridized hydroxyapatite under relatively mild reaction conditions(250℃ and 2 MPa of N_(2))in the absence of a precious-metal catalyst and a corrosive homogeneous alkali.

关键词： Ionic liquid Hydroxyapatite Itaconic acid Methacrylic Decarboxylation reaction

Slip distribution inversion of seismic sub-fault dip iteration using gradient based optimizer algorithm

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Geodesy and Geodynamics 2024年第2期15卷 114-121页

作者： Leyang wang Han Li Ming pang Key Laboratory of Mine Environmental Monitoring and Improving Around Poyang Lake of Ministry of Natural Resources East China University of TechnologyNanchang 330013China School of Surveying and Geoinformation Engineering East China University of TechnologyNanchang 330013China College of Resources and Environment Shandong Agricultural UniversityTaian 271018China

This paper considers setting different dips for different sub-faults to fit the actual rupture situation based on the fault rupture of the 2013 Lushan M_(S)7.0 ***,combined with the coseismic GNSS data of the Lushan earthquake,the source parameters and sliding distribution of the Lushan earthquake fault are ***,we use the gradient based optimizer(GBO)in nonlinear inversion to obtain the source parameters of this seismic *** inversion results indicate that the strike of the fault is 206.52°,the dip is 44.10°,the length is 21.92 km,and the depth is 12.79 *** refine the sliding distribution of the seismic fault,the seismic fault is divided into 3×3 ***,we fix the central sub-fault dip of 44.10°;the dip of other sub-faults is obtained by *** that,the model is further divided into a fault layer model composed of 23×19 sub fault slices,and using the Matlab fitting function is used to fit the dip of the 23×19 sub ***,the Lushan seismic fault plane is established as a shovel structure with steep upper and gentle lower,steep south and gentle *** slip distribution inversion results indicate that the depth of the slip peak is 13 km,the corresponding maximum slip momentum is 0.67 m,the seismic moment is 1.10×10^(19)N·m and the corresponding moment magnitude is *** results above are consistent with the research results of seismology.

关键词： Gradient basedoptimizer(GBO) Lushan earthquake Non-planefault model Slid distribution

Defect passivation with potassium trifluoroborate for efficient spray-coated perovskite solar cells in air

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Journal of Semiconductors 2022年第9期43卷 25-33页

作者： Chen Gao Hui wang pang wang Jinlong Cai Yuandong Sun Cong Yu Teng Li Xiaoshuai Zhang Dan Liu Tao wang School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Defects as non-radiative recombination centers hinder the further efficiency improvements of perovskite solar cells(PSCs).Additive engineering has been demonstrated to be an effective method for defect passivation in perovskite ***,we employed(4-methoxyphenyl)potassium trifluoroborate(C_(7)H_(7)BF_(3)KO)with and K+functional groups to passivate spray-coated(FAPbI_(3))_(x)(MAPbBr_(3))_(1-x) perovskite and eliminate *** is shown that the F of can form hydrogen bonds with the H atom in the amino group of MA+/FA+ions of perovskite,thus reducing the generation of MA+/FA+vacancies and improving device ***,K+and reduced MA+/FA+vacancies can inhibit ion migration,thereby eliminating *** the aid of C_(7)H_(7)BF_(3)KO,we obtained hysteresis-free PSCs with the maximum efficiency of 19.5%by spray-coating in *** work demonstrates that additive engineering is promising to improve the performance of spray-coated PSCs.

关键词： perovskite solar cells spray-coating additive engineering defect passivation hysteresis

Key Management Protocol of the IEEE 802.16e

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Wuhan University Journal of Natural Sciences 2007年第1期12卷 59-62页

作者： TIAN Haibo pang Liaojun wang Yumin State Key Laboratory of Integrated Service Network Xidian University Xi＇an 710071 Shaanxi China

IEEE 802.16e, as an amendment and corrigendum to the IEEE 802.16-2004, published on 28 February 2006, and intended to update and expand IEEE 802.16-2004 to allow for mobile subscriber stations. This paper summarizes the key management protocol belonging to security part of the IEEE 802.16e, which includes security negotiation, authorization, key derivation, handshake, and key transportation. While these building blocks are well designed, we point out some unwelcome features for these building blocks. We also give out suggestions to diminish the proposed problems.

关键词： IEEE 802.16e security analysis key management protocol

胎儿三血管气管切面动脉导管弓左侧血管的鉴别诊断

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心肺血管病杂志 2024年第3期43卷 291-296页

作者：苟中山肖丽位晨晨黄青霞王敏王汸王海霞苏州市立医院(南京医科大学附属苏州医院)心血管病中心 215008 大庆市人民医院超声科

目的:探讨三血管气管切面(three-vessel trachea view, 3VT)动脉导管弓(ductus arteriosus arch,DAA)左侧血管的超声鉴别诊断流程、主要切面和鉴别要点。方法:回顾性分析我院胎儿心脏超声检查过程中,3VT切面于DAA左侧探及血管的胎儿34... 详细信息

目的:探讨三血管气管切面(three-vessel trachea view, 3VT)动脉导管弓(ductus arteriosus arch,DAA)左侧血管的超声鉴别诊断流程、主要切面和鉴别要点。方法:回顾性分析我院胎儿心脏超声检查过程中,3VT切面于DAA左侧探及血管的胎儿34例。总结形成DAA左侧血管的疾病类型,归纳鉴别诊断的流程、主要切面和鉴别要点。所有病例均采用出生后新生儿心脏超声证实。结果:(1)根据形成3VT切面DAA左侧血管的病因,将研究对象分为五组:双侧上腔静脉组21例(bilateral superior vena cava, BSVC, 61.8%)、孤立性永存左上腔静脉组2例(isolated left superior vena cava, ILSVC, 5.9%)、左无名静脉弓下走行组3例(subaortic left brachiocephalic vein, SLBCV, 8.8%)、心上型肺静脉异位引流的垂直静脉组3例(vertical vein, VV, 8.8%)和动脉导管壁瘤样膨出组5例(aneurysm of ductus arteriosus, ADA,14.7%)。(2) BSVC鉴别要点是左上腔静脉回流至冠状静脉窦或左心房;ILSVC鉴别要点是仅探及左上腔静脉,右上腔静脉缺如;SLBCV鉴别要点是左无名静脉从主动脉弓下穿行;VV鉴别要点是VV血流方向为从下至上,背离心脏;ADA鉴别要点是动脉导管壁呈瘤样膨出,其频谱为动脉频谱。结论:胎儿3VT切面上DAA左侧血管的鉴别诊断包括BSVC、ILSVC、SLBCV、VV和ADA。超声医师掌握各个疾病的鉴别诊断流程和鉴别要点有助于提高对相关畸形的产前检出和诊断能力。

关键词：三血管气管切面动脉导管弓左侧鉴别诊断