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山东电网长期运行导线表面状态研究

山东电力技术 2015年第1期42卷 20-24页

作者：姜雨泽郭国化李乐丰郑南琛陈澜张若兵国网山东省电力公司电力科学研究院济南250000 清华大学深圳研究生院深圳518055

对山东电网运行导线大范围有针对性的取样,根据各组导线所处污区分级、运行年限差异进行统计分析,总结大气环境、运行年限对老化导线表面状态的影响程度。数据分析结果表明,运行环境对表面状态有很大影响,污秽成分中的镁、铁元素百分比... 详细信息

对山东电网运行导线大范围有针对性的取样,根据各组导线所处污区分级、运行年限差异进行统计分析,总结大气环境、运行年限对老化导线表面状态的影响程度。数据分析结果表明,运行环境对表面状态有很大影响,污秽成分中的镁、铁元素百分比随污区等级增大而增大,同时表面粗糙度同样满足这种趋势;运行年限对导线表面的污秽成分影响不大;导线表面粗糙程度随运行年限增加。

关键词：老化导线污区运行年限表面状态

Helicity‐dependent THz emission induced by ultrafast spin photocurrent in nodal‐line semimetal candidate Mg3Bi2

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Opto-Electronic Advances 2020年第12期3卷 9-16页

作者： Mingyu Tong yuze Hu Xiangnan Xie Xiegang Zhu Zhenyu Wang Xiang'ai Cheng Tian jiang College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China National Innovation Institute of Defense Technology Academy of Military Sciences PLA ChinaBeijing 100010China State Key Laboratory of High Performance Computing College of ComputerNational University of Defense TechnologyChangsha 410073China Beijing Academy of Quantum Information Sciences Beijing 100193China Science and Technology on Surface Physics and Chemistry Laboratory Jiangyou 621908China

Helicity-dependent ultrafast spin current generated by circularly polarized photons in topological materials holds the crux to many technological improvements,such as quantum communications,on-chip communication processing and ***,we present the manipulation of helicity-dependent terahertz emission generated in a nodal line semimetal candidate Mg3Bi2 by using photon polarization *** terahertz emission is mainly ascribed to the helicity-dependent photocurrent that is originated from circular photogalvanic effects,and the helicity-independent photocurrent that is attributed to linear photogalvanic *** work will inspire more explorations into novel nodal line semimetals and open up new opportunities for developing ultrafast optoelectronics in the topological system.

关键词： terahertz spin photocurrent nodal-line semimetal topological material

Take Bitcoin into your portfolio:a novel ensemble portfolio optimization framework for broad commodity assets

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Financial Innovation 2021年第1期7卷 1405-1430页

作者： yuze Li Shangrong jiang Yunjie Wei Shouyang Wang School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Academy of Mathematics and Systems Science Chinese Academy of SciencesZhongguancun East Road#55Haidian DistrictBeijing 100190China Center for Forecasting Science Chinese Academy of SciencesBeijing 100190China

The emergence and growing popularity of Bitcoins have attracted the attention of the financial ***,few empirical studies have considered the inclusion of the newly emerged commodity asset in the global commodity *** is of great importance for investors and policymakers to take advantage of this asset and its potential benefits by incorporating it as a part of the broad commodity trading *** this study,we propose a novel ensemble portfolio optimization(NEPO)framework utilized for broad commodity assets,which integrates a hybrid variational mode decomposition-bidirectional long short-term memory deep learning model for future returns forecast and a reinforcement learning-based model for optimizing the asset weight *** empirical results indicate that the NEPO framework could effectively improve the prediction accuracy and trend prediction ability across various commodity assets from different *** addition,it could effectively incorporate Bitcoins into the asset pool and achieve better financial performance compared to traditional asset allocation strategies,commodity funds,and indices.

关键词： Portfolio optimization Bitcoin Deep learning Reinforcement learning Variational mode decomposition

Assessing the effects of oyster/kelp weight ratio on water column properties: an experimental IMTA study at Sanggou Bay, China

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Journal of Oceanology and Limnology 2020年第6期38卷 1914-1924页

作者： FANG Jinghui FANG jianguang CHEN Qionglin MAO yuze jiang Zengjie DU Meirong GAO Yaping LIN Fan Laboratory for Marine Fisheries Science and Food Production Processes Pilot National Laboratory for Marine Science and Technology(Qingdao)/Yellow Sea Fisheries Research InstituteChinese Academy of Fishery SciencesQingdao 266071China Key Laboratory of Marine Biotechnology of Zhejiang Province School of Marine SciencesNingbo UniversityNingbo 315211China

Integrated Multi-Trophic Aquaculture(IMTA)is an effective method for sustainable aquaculture as species from different trophic levels could reduce negative effects from fed species in the environment.A proper proportion of different trophic species in an IMTA system could improve the aquaculture production and environmental *** present,research on the proper proportions for farming species is *** investigated the effects of IMTA modes of oyster(Crassostrea gigas)and kelp(Saccharina japonica)in different weight ratios on water quality and carbonate system in a closed enclosure experiment for three days in the Sanggou Bay in Shandong Province,China,in December *** collocation modes in oyster:kelp weight ratio were tested showing as 24:3,24:2,24:1,16:3,16:2,16:1,8:3,8:2,and 8:*** water parameters were determined at 17:00 on Day 1(D1),and 6:00 and 17:00 on Days 2(D2)and 3(D3).As two-way ANOVA showed,all increased parameters(dissolved oxygen(DO),pH,chl a,the carbonate system and pCO2)were significantly related to oyster-kelp modes,and interaction between modes and time were also significant(P<0.05).On the 3th day,the 8:3 mode was the highest in DO,pH,chl a,CO32-(P<0.05),and dissolved inorganic carbon(DIC),HCO3-,CO2,and pCO2 were the lowest(P<0.05).According to previous references and the results of this study,the appropriate oyster:kelp proportion at the beginning of winter is from 8:2 to 8:*** results of this study may help government to optimize the aquaculture structure of Sanggou Bay.

关键词： Integrated Multi-Trophic Aquaculture(IMTA) Pacific oyster Crassostrea gigas kelp Saccharina japonica

In-situ 3D contour measurement for laser powder bed fusion based on phase guidance

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Theoretical & Applied Mechanics Letters 2023年第2期13卷 113-119页

作者： yuze Zhang Pan Zhang Xin jiang Siyuan Zhang Kai Zhong Zhongwei Li State Key Lab of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan430074China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen51800China

In-situ layerwise imaging measurement of laser powder bed fusion(LPBF)provides a wealth of forming and defect data which enables monitoring of components quality and powder bed *** high-resolution camera layerwise imaging and image processing algorithms to monitor fusion area and powder bed geometric defects has been studied by many researchers,which successfully monitored the contours of components and evaluated their ***,research for the methods of in-situ 3D contour measurement or component edge warping identification is *** this study,a 3D contour mea-surement method combining gray intensity and phase difference is proposed,and its accuracy is verified by designed *** results show that the high-precision of the 3D contours can be achieved by the constructed energy minimization *** method can detect the deviations of common ge-ometric features as well as warpage at LPBF component edges,and provides fundamental data for in-situ quality monitoring tools.

关键词： Laser powder bed fusion In-situ measurement Active contours 3D contour Measurement accuracy

The climate impact of high seas shipping

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National Science Review 2023年第3期10卷 102-116页

作者： yuze Li Peng Jia Shangrong jiang Haijiang Li Haibo Kuang Yongmiao Hong Shouyang Wang Xueting Zhao Dabo Guan Questrom School of Business Boston University Collaborative Innovation Center for Transport Studies Dalian Maritime University School of Maritime Economics and Management Dalian Maritime University School of Economics and Management University of Chinese Academy of Sciences Academy of Mathematics and Systems Science Chinese Academy of Sciences Center for Forecasting Science Chinese Academy of Sciences School of Entrepreneurship and Management Shanghai Tech University Department of Earth System Science Tsinghua University School of International Development University of East Anglia

Strict carbon emission regulations are set with respect to countries’ territorial seas or shipping activities in exclusive economic zones to meet their climate change commitment under the Paris ***,no shipping policies on carbon mitigation are proposed for the world’s high seas regions,which results in carbon intensive shipping *** this paper,we propose a Geographic-based Emission Estimation Model(GEEM) to estimate shipping GHG emission patterns on high seas *** results indicate that annual emissions of carbon dioxide equivalent(CO2-e) in shipping on the high seas reached 211.60 million metric tonnes in 2019,accounting for about one-third of all shipping emissions globally and exceeding annual GHG emissions of countries such as *** average emission from shipping activities on the high seas is growing at approximately 7.26% per year,which far surpasses the growth rate of global shipping emission at 2.23%.We propose implementation of policies on each high seas region with respect to the main emission driver identified from our *** policy evaluation results show that carbon mitigation policies could reduce emissons by 25.46 and 54.36 million tonnes CO2-e in the primary intervention stage and overall intervention stage,respectively,with 12.09% and 25.81% reduction rates in comparison to the2019 annual GHG emissions in high seas shipping.

关键词： high seas international shipping GHG emission policy evaluation emission drivers

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具有中点电位非对称控制的VSVPWM技术

电气传动 2021年第4期51卷 40-46页

作者：江雨泽付光杰哈尔滨科学技术职业学院现代服务学院黑龙江哈尔滨150300 东北石油大学电气信息工程学院黑龙江大庆163318

在降低NPC式三电平逆变器中点电位波动问题时,传统的VSVPWM算法未考虑直流侧电容电压非对称情况。为此,需从理论上探讨对称时的虚拟矢量形式是否适用于非对称状态下的各虚拟矢量。提出了具有中点电位非对称控制的VSVPWM技术,并在引入中... 详细信息

在降低NPC式三电平逆变器中点电位波动问题时,传统的VSVPWM算法未考虑直流侧电容电压非对称情况。为此,需从理论上探讨对称时的虚拟矢量形式是否适用于非对称状态下的各虚拟矢量。提出了具有中点电位非对称控制的VSVPWM技术,并在引入中点电位不平衡度的基础上通过改进零矢量的持续作用时间实现直流侧电容电压非对称控制。该方法具有较宽的调制比适用范围,并能够精确地控制直流侧电容电压,提高线电压质量,有效降低中点电位波动幅度。仿真和实验结果验证了该方法的有效性和优越性。

关键词：三电平NPC逆变器 VSVPWM技术中点电位波动直流侧非对称控制零矢量时间分配

Double⁃Shear Experiments of Cold⁃Formed Steel Stud⁃to⁃Sheathing Connections at Elevated Temperatures

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Journal of Harbin Institute of Technology(New Series) 2021年第6期28卷 44-62页

作者： Kun Liu Wei Chen Jihong Ye yuze Yang Jian jiang Yafei Qin jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering China University of Mining&TechnologyXuzhou 221116China Key Laboratory of Building Fire Protection Engineering and Technology of MPS Tianjin 300381China Shanghai Beststeel Steel Structure Building System Co. Shanghai 200949China

The behavior of cold⁃formed steel(CFS)stud⁃to⁃sheathing connections at elevated temperatures is an important parameter for the fire resistance design and modeling of mid⁃rise CFS *** this paper,three kinds of sheathings,namely,medium⁃and low⁃density calcium⁃silicate boards and oriented strand board,were selected for double⁃shear experiments on the mechanical properties of 253 screw connections at ambient and elevated *** effects of the shear direction,screw edge distance and the number of screws on the behavior of the connections were *** results showed that the shear direction and the screw edge distance more significantly influenced the peak deformation,while their impacts on the peak load varied with the type of *** with the single⁃screw connections,the peak loads of the specimens with double⁃screw connections obviously increased but did not ***,a simplified load⁃displacement curve model of stud⁃to⁃sheathing connections at elevated temperature was generated first by establishing the prediction formula for characteristic parameters,such as the peak load,the peak deformation and the elastic stiffness,and then by considering whether the curves corresponded to stiffness increase *** present investigation provides basic data for future studies on the numerical modeling of CFS structures under fire conditions.

关键词： cold⁃formed steel structures stud⁃to⁃sheathing screw connections double⁃shear experiments elevated temperature load⁃displacement model

CIDP: a multi-functional platform for designing CRISPR sgRNAs

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Horticulture Research 2023年第7期10卷 1-3页

作者： Dong Xu Jin Zhang Xianjia Zhao yuze Hou Heling jiang Wenchuang He Xiongfeng Ma Weihua Pan Shenzhen Branch Guangdong Laboratory for Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen518120China State Key Laboratory of Subtropical Silviculture College of Forestry and BiotechnologyZhejiang A&F UniversityHangzhouZhejiang 311300China College of Data Science Taiyuan University of TechnologyTaiyuanShanxi 030600China State Key Laboratory of Cotton Biology Institute of Cotton ResearchChinese Academy of Agricultural SciencesAnyang 455000China

Dear Editor,Compared with traditional technologies affecting gene expression,changing DNA sequences of target genes is one of the most outstanding characters of CRISPR(Clustered Regularly Interspaced Short Palindromic Repeats).Single-guide RNAs(sgRNAs)guiding endonuclease Cas to target sites is a crucial step of CRISPR-Cas system for changing DNA *** ideal sgRNA should only bind to the target ***,similar sequences of non-target sites can also be recognized leading to off-target effects[1].

关键词： designing Regular functional