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System Adaptive AC Filter for a Line Commutated Converter High Voltage DC Transmission System

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CSEE Journal of Power and Energy Systems 2020年第4期6卷 901-910页

作者： xinyang liu Weimin Ma Hongjie Jia Chaoyu Dong School of Electrical and Information Engineering of Tianjin University Tianjin 300072China State Grid Economic and Technological Research Institute Co. LtdBeijing 102209China

This paper proposes a novel AC filter system for a line commutated converter high voltage DC(LCC-HVDC)transmission *** the coordination of the hybrid active power filters(APF)and the existing reactive compensation devices,the proposed filter system can not only enhance the suppression performance for LCC-HVDC harmonics,but also optimize the AC yard layout with reduced reactive power subbanks,reducing the cost of HVDC *** novel filter system adopts a serial passive resonance topology obtained by careful comparison of different APFs.A proper control scheme is then designed integrating the control strategy of the APF and impedance characteristics of the HVDC system,which is able to realize harmonic suppression and dynamic reactive power support *** addition,a novel self-adaption digital low-pass filter algorithm is presented,which is used in the APF harmonic detecting step,enhancing both high precision and fast dynamic *** the basis of a real HVDC project,the advantages of proposed filter system in harmonic suppression,reactive power regulation,and sub-banks reduction are simulated and demonstrated.

关键词： Active power filter(APF) control system harmonic detecting impedance characteristic line commutated converter high voltage DC(LCC-HVDC) reactive compensation

Surface Modified TiO2 Nanoparticles-an Effective Anti-wear and Anti-friction Additive for Lubricating Grease

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China Petroleum Processing & Petrochemical Technology 2017年第2期19卷 74-79页

作者： Li Yi liu xinyang liu Dajun Sun Hongwei China Petroleum & Chemical Corporation Beijing 100728 SINOPEC Research Institute of Petroleum Processing Beijing 100083

The surface modified TiO_2 nanoparticles were prepared by using 12-hydroxystearic acid chemically modified on the TiO_2 surface. The average size of the TiO_2 particles is about 30 nm. The optimum ratio of tetrabutyl titanate to 12-hydroxystearic acid was 1/0.5. The bonding form between 12-hydroxystearic acid and TiO_2 nucleus was investigated by FTIR, DSC, TGA and XRD techniques. The lubricating grease containing the surface modified TiO_2 nanoparticles possesses excellent anti-wear and anti-friction properties. Compared with the grease without TiO_2, the PB value can be increased by 52% as the best performance of the grease containing surface modified TiO_2 nanoparticles, while the friction coefficient can be reduced by 33% with the addition of a small amount of TiO_2 nanoparticles, and meanwhile the wear scar diameter decreases by 25%.

关键词： TiO2 nanoparticles lubricating grease anti-wear anti-friction

Dendrimers-merging biomimics and photoenergy conversion

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Science China Chemistry 2015年第3期58卷 390-399页

作者： xinyang liu Yi Zeng Xiaohui Zhang Tianjun Yu Jinping Chen Yi Li Key Laboratory of Photochemical Conversion and Optoelectronic Materials Technical Institute of Physics and Chemistry Chinese Academy of Sciences

Dendrimers are well-defined tree-like macromolecules possessing numerous chain ends emanating from a single core, which makes them attractive candidates for mimicking light-harvesting systems and hydrogenases. Photoinduced electron and energy transfers are main processes involved in light-harvesting and photocatalysis. In this review, the general concepts of design strategies and recent developments of photofunctional dendrimers in biomimics of light-harvesting systems and hydrogenases are discussed. The energy transfer and electron transfer processes in light-harvesting dendrimers and the effect of dendritic structures in photochemical hydrogen production are illustrated.

关键词： photofunctional dendrimers light-harvesting hydrogen production energy transfer electron transfer

Discussion on the Mechanism of Boric Acid and Phosphoric Acid to Improve the Hardening of Complex Calcium Lubricating Grease

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China Petroleum Processing & Petrochemical Technology 2019年第4期21卷 112-118页

作者： Zheng Hui Sun Hongwei He Yifeng Su Shuo Zhuang Minyang liu xinyang SINOPEC Research Institute of Petroleum Processing

In order to solve the hardening problem of complex calcium lubricating grease, the water absorption test of several calcium salts was carried out, and it was found that calcium 12-hydroxystearate did not absorb water, and calcium acetate, calcium phosphate and calcium borate had different degrees of water absorption. Calcium acetate has the highest water absorption rate, while calcium phosphate and calcium borate show comparable water absorption rates. Upon using the molecular simulation technology, it is found that in the complex calcium grease system, calcium phosphate and calcium borate tend to combine with water, which inhibits the water absorption of calcium acetate and alleviate the hardening problem.

关键词： lubricating grease complex calcium hardening

Strategies for Construction of Majors in Universities with Different Characteristic Based on Social Needs

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Journal of Systems Science and Information 2019年第5期10卷 474-485页

作者： Xiuli TAN Zhongquan CHEN xinyang liu Peter DEENEY Zhisong CHEN Business School Yantai Nanshan UniversityYantai 265713China School of Business Administration Northeastern UniversityShenyang 110819China Business School Dublin City UniversityGlasnevin 7008002Ireland Business School Deakin UniversityMelbourneVIC 3125Australia

We used the basic principles of game theory to investigate development strategies for standards of professional competence in universities in the same geographic area,under conditions of non-uniform distribution of social demand *** results revealed that,under various conditions in our model,different approaches for differential strategies were selected by university U2 compared with university ***,in the competition between U1 and U2,there is a differential strategy compression point of U2 to U1;When U2 universities choose the biggest differentiation strategy,university U1 also have differentiated strategy control *** decision-making of university U1 in relation to university U2 was based on the requirements of professional competence standards,according to the change of the social demand for professional competency standard,universities U2 will adopt the strategy of"no difference","maximum differentiation"and"comprehensive intermediate strategy",*** current results have theoretical implications for the selection of professional development and professional competence development strategies in asymmetric universities operating in the same geographic area.

关键词： heterogeneous preferences specialty construction game analysis

Bi-doped carbon quantum dots functionalized liposomes with fluorescence visualization imaging for tumor diagnosis and treatment

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Chinese Chemical Letters 2024年第4期35卷 414-419页

作者： Peide Zhu Yangjia liu Yaoyao Tang Siqi Zhu xinyang liu Lei Yin Quan liu Zhiqiang Yu Quan Xu Dixian Luo Juncheng Wang State Key Laboratory of Heavy Oil Processing China University of Petroleum-BeijingBeijing 102249China Department of Laboratory Medicine Dongguan Institute of Clinical Cancer ResearchAffiliated Dongguan HospitalSouthern Medical UniversityDongguan 523058China Department of Laboratory Medicine Huazhong University of Science and Technology Union Shenzhen Hospital(Nanshan Hospital)Shenzhen 518052China Institute of Stomatology First Medical CenterChinese PLA General HospitalBeijing 100853China

Liposomes are one of the significant classes of antitumor nanomaterials and the most successful nanomedicine drugs in clinical translation. However, it is difficult to accurately reveal liposome delivery modes and drug release rates at different p H values to assess the biodistribution and drug delivery pathways in vivo. Here, we established a strategy to integrate Bi-doped carbon quantum dots(CQDs)with liposomes to produce fluorescence visualization and therapeutic effects, namely lipo/Bi-doped ***/Bi-doped CQDs show good water solubility and physicochemical properties, which can be used for in vitro labeling of colon cancer(CT26) cells and in vivo imaging localization tracking tumors for monitoring. Simultaneously, thanks to the excellent p H sensitivity and ion doping characteristic of Bi-doped CQDs, lipo/Bi-doped CQDs can be used to reveal the drug release rate of liposomes at different p H values and exhibit potential effects in vivo antitumor therapy.

关键词： Bi-doped CQDs Lipo/Bi-doped CQDs pH sensitivity In vitro/in vivo imaging Diagnosis and treatment integration

Characteristics of Uranium Mineralization in Red Clastic Formations in the Southwestern Margin of the Ordos Basin

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Acta Geologica Sinica(English Edition) 2020年第5期94卷 1471-1487页

作者： ZHANG Zilong HE Feng YI Longsheng FAN Honghai CAI Yuqi liu Hongxu liu xinyang CHEN Hongbin JIA Cui YANG Mengjia Key Laboratory of Uranium Resource Exploration and Evaluation Technology(CNNC) Beijing Research Institute of Uranium GeologyBeijing 100029China China National Uranium Corp. Beijing 100013China No.203 Research Institute of CNNC XianyangShaanxi 712000China

In the southwestern margin of the Ordos Basin,uranium mineralization is primarily hosted by predominantly oxidative red clastic formations in the Lower *** main target layers for uranium exploration are the Madongshan and Liwaxia formations of the liupanshan Group,followed by the Jingchuan Formation of the Zhidan *** host rocks(medium-fine feldspar quartz sandstone),which are bleached to a light grayish white color,contain a minor organic matter component and *** mineralization changes from surficial infiltration or phreatic oxidation in the upper part to interlayer oxidation in the lower *** ore bodies are mostly lenticular or tabular in shape,locally shaped like crescent *** ore bodies are typically small and *** predominantly manifests as pitchblende and *** is usually short and columnar or granular in habit,whereas pitchblende occurs as an irregular colloidal covering on the surface or in fissures of ferric oxide,silicate,clay or *** uranium minerals are torbernite,uranophane,and *** associated with uranium are mainly pyrite,chalcopyrite and,to a minor extent,arsenopyrite and *** associated elements are Mo,V,Se,Co,Ni,and Mn,the host sandstone being high in Cu and ***,the red clastic formations in the southwestern margin of the Ordos Basin are characterized by’five multiples but one low’which means multiple target layers,multiple stages of mineralization,multiple ore body shapes,multiple kinds of uranium minerals,multiple associated elements,but low organic *** implies an overall complex uranium metallogenic environment and mineralization *** is recommended that future uranium exploration should take into consideration regional metallogenic conditions and mineralization features,with target layers in the wide-smooth synclinal slope being focused *** uranium deposits are small to medium in size,and the main type of urani

关键词： red clastic formation uranium mineralization Lower Cretaceous southwestern Ordos Basin

Cloning, Characterization and Transformation of Methyltransferase 2a Gene (Zmet2a) in Maize (Zea mays L.)

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Phyton-International Journal of Experimental Botany 2024年第7期93卷 1767-1779页

作者： Xin Qi Yu Wang Xing Zhang Xiaoshuang Wei xinyang liu Zhennan Wang Zhenhui Wang Fenglou Ling Faculty of Agronomy Jilin Agricultural UniversityChangchun130118China Rice Research Center Jilin Agricultural UniversityChangchun130118China

DNA methylation is an important epigenetic regulatory mechanism,it regulates gene expression by recruiting proteins involved in gene repression or by inhibiting the binding of transcription factor(s)to *** this study,a novel methyltransferase 2a gene(Zmet2a)was cloned in maize and identiﬁed by polymerase chain reaction-base(PCR-base)using a bioinformatics *** Zmet2a cDNA sequence is 2739 bp long and translates to 912 amino acid *** Zmet2a protein revealed that it contains BAH and CHROMO structural domains,is a non-transmembrane protein that is hydrophilically unstable,and has no signal peptide ***,we veriﬁed the biological roles of Zmet2a using transgenic Arabidopsis overexpressing Zmet2a and Zmet2a-knockout *** Zmet2a Arabidopsis thaliana showed highly signiﬁcant advancement inﬂowering time,and Zmet2a-knockout maize showed advancement inﬂowering time,with signiﬁcant changes in several ***,these report the role of Zmet2a in the regulation ofﬂowering time,which will lay a foundation for revealing the biological function and epigenetic regulation mechanism of Zmet2a in the growth,development andﬂowering of maize.

关键词： DNA methylation methyltransferase Zea mays L ﬂowering time functional analysis

The Impact of Labor Mobility on Urban-rural Income Gap: Based on Life Cycle Perspective

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环球市场信息导报 2017年第27期 66-67页

作者： xinyang liu School of Economics Management Beijing University of Chemical Technology

Viewed from the life cycle perspective of the rural labor force, the labor flow in the process of urbanization is happening in three stages. The first stage is seeking non-agricultural employment in rural areas; the second stage is securing the urban resident employment; the third stage is migrant workers obtaining urban household registration. This study establishes a multi-regression model of urban and rural income disparity that takes into account other control variables. The results of the model analysis show that the first stage of labor mobility can significantly narrow the income gap between urban residents and rural residents; yet the second stage of labor mobility does not expand the income gap between urban and rural areas in a significant manner; the third stage of labor mobility can substantially reduce the income gap between urban and rural areas; the combined effect of the three stages of labor mobility is substantial shrink of the income gap between urban and rural areas. However, the reality of the discrepancy between urban and rural income gap in China is not consistent with the gradually dwindled large-scale labor flow, mainly due to industrialization, urban biography of cultural and educational finance, and foreign trade expansion of urban and rural income gap.

关键词： Mobility Urban-rural Perspective