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International Journal of Mining Science and Technology 2020年第6期30卷 777-783页

作者： Jinjin Tian Dongjing Xu tianhao liu College of Earth Sciences&Engineering Shandong University of Science and TechnologyQingdao 266590China

The distribution characteristics and evolution law of rock mass fissures induced by mining are a key scientific issue in the study of deep rock *** this study,a series of uniaxial compression experiments was conducted... 详细信息

关键词： V-shaped fissure Fracturing process Overburden strata Coal mining

Effects of Voltage Sag on the Performance of Induction Motor Based on a New Transient Sequence Component Method

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CES Transactions on Electrical Machines and Systems 2019年第3期3卷 316-324页

作者： Dongdong Zhang tianhao liu School of Electrical Engineering Guangxi UniversityNanning530004China Department of Electrical and Electronic Engineering University of Hong KongHong Kong999077China

Voltage sag is one of the most common power quality disturbances in industry,which causes huge inrush currents in stator windings of induction motors,and adversely impacts the motor secure *** paper firstly introduces a 2D Time-Stepping multi-slice finite element method(2D T-S multi-slice FEM)which is used for calculating the magnetic field distribution in induction motors under different sag *** the paper deduces the transient analytical expression of stator inrush current based on the classical theory of AC motors and presents a separation method for the positive,negative and zero sequence values based on instantaneous *** this method,the paper studies the influences of voltage sag amplitude,phase-angle jump and initial phase angle on the stator positive-and negative-sequence peak currents of 5.5 kW and 55 kW induction *** paper further proposes a motor protection method under voltage sag condition with the stator negative-sequence peak currents as the protection threshold,so that the protection false trip can be avoided ***,the calculation and analysis results are validated by the comparison of calculated and measured stator peak value of the 5.5 kW induction motor.

关键词： Induction motors instantaneous negative sequence current time-stepping finite element method voltage sag.

The evolution of the Kuroshio Current over the last 5 million years since the Pliocene: Evidence from planktonic foraminiferal faunas

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Science China Earth Sciences 2020年第11期63卷 1714-1729页

作者： Jia WANG Fengming CHANG Tiegang LI Hanjie SUN Yikun CUI tianhao liu Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMNRQingdao 266061China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Meridional heat transport of the western Pacific boundary current(the Kuroshio Current)is one of the key factors in global climate *** current is important because it controls the temperature gradient between low latitudes and the North Pacific and so significantly influences mid-latitude atmosphere-ocean *** we reconstruct changes in hydrological conditions within the mid-latitude mainstream of the Kuroshio Current based on faunal analysis of planktonic foraminifera in core DSDP 296 from the Northwest Pacific *** approach enabled us to deduce evolutionary processes within the Kuroshio Current since the Pliocene.A total of 57 species in the coarser section(>150μm)were identified;results indicate that planktonic foraminiferal faunal evolution has mainly been characterized by three major stages,the first of which comprised mixed-layer warm-water species of Globigerinoides ruber which first appeared between 3.5 and 2.7 Ma and then gradually increased in *** of another warm-water species of *** also gradually increased in number over this *** in warm-water species indicate a gradual rise in sea surface temperature(SST)and imply initiation of Kuroshio Current impact on the Northwest Pacific Ocean since at least 3.5 ***,over the period between 2.7 and 2.0 Ma,thermocline species of Globigerina calida,Neogloboquadrina humersa,Neogloboquadrina dutertrei,and Pulleniatina obliquiloculata started to appear in the *** fauna was dominated by *** as well as increasing *** *** features imply a further rise in SST and its gradually enhanced influence on thermocline water,suggesting strengthening of the Kuroshio Current since 2.7 ***,between 2.0 Ma and present,increasing contents of thermocline species(i.e.,***,*** and ***)indicate a gradual rise in seawater temperature at this depth and also imply more intensive Kuroshio Current during th

关键词： Pliocene Kuroshio Planktonic foraminifera Western Pacific Warm Pool

Progress on the ultrasonic testing and laser thermography techniques for NDT of tokamak plasma-facing components

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Theoretical & Applied Mechanics Letters 2019年第3期9卷 180-187页

作者： Cuixiang Pei Haochen liu Jinxing Qiu tianhao liu Zhenmao Chen Shaanxi Engineering Research Center of NDT and Structural Integrity Evaluation State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong University

During manufacturing and operation, different kinds of defects, e.g., delamination or surface cracks, may be generated in the plasma-facing components (PFCs) of a Tokamak device. To ensure the safety of the PFCs, various kinds of nondestructive testing (NDT) techniques are needed for different defect and failure mode. This paper gives a review of the recently developed ultrasonic testing (UT) and laser thermography methods for inspection of the delamination and surface cracks in PFCs. For monoblock W/Cu PFCs of divertor, the bonding quality at both W-Cu and Cu- CuCrZr interfaces was qualified by using UT with a focus probe during manufacturing. A noncontact, coupling-free and flexible ultrasonic scanning testing system with use of an electromagnetic acoustic transducer and a robotic inspection manipulator was introduced then for the in-vessel inspection of delamination defect in first wall (FW). A laser infrared thermography testing method is highlighted for the on-line inspection of delamination defect in FW through the vacuum vessel window of the Tokamak reactor. Finally, a new laser spot thermography method using laser spot array source was described for the online inspection of the surface cracks in FW.

关键词： Plasma-facing components Ultrasonic testing Laser thermography Delamination Surface crack

Single-wall carbon nanotube-containing cathode interfacial materials for high performance organic solar cells

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Science China Chemistry 2021年第4期64卷 565-575页

作者： Fei Pan Song Bai tianhao liu Dianyong Tang Xian Wei Xiwen Chen Menglan Lv Yongfang Li School of Chemical Engineering Guizhou Institute of TechnologyGuiyang 550003China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Chongqing Engineering Laboratory of Targeted and Innovative Therapeutics International Academy of Targeted Therapeutics and InnovationChongqing University of Arts and SciencesChongqing 402160China Guangzhou Polyforte Chemical Technology Co.LTD Guangzhou 510520China School of Chemical Science University of Chinese Academy of SciencesBeijing 100049China School of Chemistry and Chemical Engineering Guizhou UniversityGuiyang 550025China

Water/alcohol soluble cathode interfacial materials(CIMs)are playing important roles in optoelectronic devices such as organic light emitting diodes,perovskite solar cells and organic solar cells(OSCs).Herein,n-doped solution-processable single-wall carbon nanotubes(SWCNTs)-containing CIMs for OSCs are developed by dispersing SWCNTs to the typical CIMs perylene diimide(PDI)derivatives PDIN and *** Raman and X-ray photoelectron spectroscopy(XPS)measurement results illustrate the ndoped behavior of SWCNTs by PDIN/PDINO in the blend *** blended and n-doped SWCNTs can tune the work function and enhance the conductivity of the PDI-derivative/SWCNT(PDI-CNT)composite CIMs,and the composite CIMs can regulate and down-shift the work function of cathode,reduce the charge recombination,improve the charge extraction rate and enhance photovoltaic performance of the *** power conversion efficiency(PCE)of 17.1%and 17.7%are obtained for the OSCs based on PM6:Y6 and ternary PM6:Y6:PC_(71) BM respectively with the PDI-CNTcomposites *** results indicate that the ndoped SWCNT-containing composites,like other n-doped nanomaterials such as zero dimensional fullerenes and two dimensional graphenes,are excellent CIMs for OSCs and could find potential applications in other optoelectronic devices.

关键词： organic solar cells cathode interfacial materials n-doped single wall carbon nanotubes silver electrode

Scalable synthesis of A_2S_3 (A=Sb, Bi) submicro/nanowires using their powders via solvothermal proceeding

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Chinese Science Bulletin 2006年第6期51卷 655-660页

作者： JI tianhao liu Guanrao QI Xingyi YANG Qinglin DENG Yuan GUO Lin Applied Chemistry Department School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing100083 China

Single-crystal A2S3 (A=Sb, Bi) nanowires were successfully prepared via using their powders as precursors by solvothermal proceeding. The reac-tion temperature and time as well as solvent strongly influence final A2S3 crystalline morphology and size. Experimental results show that Sb2S3 rods prepared in ethylene glycol are thicker than its wires with av-erage diameter of 400 nm prepared in the mixture solvent of ethylene glycol and ethylenediamine at 200 oC for 24 h. However, under the same reaction con-dition, uniform submicrowires of Bi2S3 with average diameter of 150 nm can be obtained. When reaction temperature is decreased to 150 oC and reaction time is 40 h, pure Sb2S3 wires cannot be prepared. The possible mechanism is briefly discussed for the transformation of the Sb2S3 powders to their wire-like crystals.

关键词：低维结构晶形转变硫化物半导体纳米线锑铋

The Innovation and Thinking on Postgraduates' Ideological and Political Education in a New Period

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The Innovation and Thinking on Postgraduates' Ideological an...

High electron mobility fluorinated indacenodithiophene small molecule acceptors for organic solar cells

2013教育技术与信息系统国际会议

作者： tianhao liu Graduate School Jilin Normal University

The ideological and political education is an important part of postgraduate education. Currently, in the face of new conditions, new changes and new problems appeared in graduates’ ideological and political education, constantly to innovate new ways and new methods for graduates’ ideological and political education, is very important for how to do well the job of postgraduates’ ideological and political education and achieving the goal of cultivating high-quality innovative talents.

关键词： Postgraduates Ideological and Political Education Innovation

来源： cnki会议评论

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Chinese Chemical Letters 2021年第3期32卷 1257-1262页

作者： Fei Pan Xiaojun Li Song Bai tianhao liu Xian Wei Yingfen Li Shanshan Chen Changduk Yang Xiwen Chen Menglan Lv Yongfang Li School of Chemical Engineering Guizhou Institute of TechnologyGuiyang 550003China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Science University of Chinese Academy of SciencesBeijing 100049China School of Chemistry and Chemical Engineering Guizhou UniversityGuiyang 550025China MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems CQU-NUS Renewable Energy Materials&Devices Joint LaboratorySchool of Energy&Power EngineeringChongqing UniversityChongqing 400044China Department of Energy Engineering School of Energy and Chemical EngineeringLow Dimensional Carbon Materials CenterUlsan National Institute of Science and Technology(UNIST)Ulsan 689-798South Korea Guangzhou Polyforte Chemical Technology Co.Ltd. Guangzhou 510520China

Indacenodithiophene(IDT)derivatives are kinds of the most representative and widely used cores of small molecule acceptors(SMAs)in organic solar cells(OSCs).Here we systematically investigate the influence of end-group fluo rination density and position on the photovoltaic properties of the IDT-based SMAs IDIC-nF(n=0,2,4).The absorption edge of IDIC-nF red-shifts with theπ-πstacking and crystallinity improvement,and their electronic energy levels downshift with increasing *** to the advantages of J_(sc)and FF as well as acceptable V_(oc),the difluorinated IDIC-2 F acceptor based OSCs achieve the highest power conversion efficiency(PCE)of 13%,better than the OSC devices based on IDIC and IDIC-4 F as *** the photovoltaic performance of the PTQ10:IDIC-2 F OSCs is insensitive to the active layer thickness:PCE still keep high values of 12.00%and 11.46%for the devices with active layer thickness of 80 and 354 nm,*** work verifies that fine and delicate modulation of the SMAs molecular structure could optimize photovoltaic performance of the corresponding ***,the thickness-insensitivity property of the OSCs has potential for large-scale and printable fabrication technology.

关键词： Organic solar cells Indacenodithiophene Electron mobility Fluorination π-πStacking Crystallinity

极端自然灾害下电力信息物理系统韧性增强策略

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电力系统自动化 2021年第3期45卷 40-48页

作者：刘天浩朱元振孙润稼刘玉田电网智能化调度与控制教育部重点实验室(山东大学) 山东省济南市250061

电力系统在极端灾害下维持并恢复正常功能的能力取决于其韧性。考虑信息系统与电力系统的相互影响,提出了一种电力信息物理系统应对极端自然灾害的韧性增强策略。首先,建立了电力信息物理系统的极端自然灾害防御框架,展示在信息物理环... 详细信息

电力系统在极端灾害下维持并恢复正常功能的能力取决于其韧性。考虑信息系统与电力系统的相互影响,提出了一种电力信息物理系统应对极端自然灾害的韧性增强策略。首先,建立了电力信息物理系统的极端自然灾害防御框架,展示在信息物理环境下的决策控制技术。在此基础上,提出电网预防分区方法,在预测防护阶段依据故障概率和拓扑连通度进行电网分区。然后,提出支路有功调整方法,用于降低灾害抵御阶段线路开断导致的支路功率越限和系统失稳的风险。针对灾后恢复,提出信息系统和电力系统协同恢复方法,以恢复停电负荷和故障线路。修改的新英格兰测试系统仿真结果表明,所提策略能够有效降低灾害风险,加快信息物理系统的恢复进度。

关键词：电网韧性信息物理系统极端自然灾害电力系统恢复

Fendt Vario900拖拉机传动系统研究

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机床与液压 2011年第15期39卷 110-112页

作者：刘天豪刘衡西南交通大学机械工程学院四川成都610031

拖拉机无级变速传动系统(CVT)是20世纪90年代后期由Fendt公司研制成功的车辆传动新技术。分析FendtVario900系列无级变速系统的结构原理及工作特性,并运用AMESim仿真工具研究其无级变速能力和液压功率分流比。结果表明:该机构可以在全... 详细信息

拖拉机无级变速传动系统(CVT)是20世纪90年代后期由Fendt公司研制成功的车辆传动新技术。分析FendtVario900系列无级变速系统的结构原理及工作特性,并运用AMESim仿真工具研究其无级变速能力和液压功率分流比。结果表明:该机构可以在全速范围内实现无级变速,传递功率大、效率高。

关键词：无级变速机液复合行星排仿真