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Three-dimensional numerical simulation of a vertical axis tidal turbine using the two-way fluid structure interaction approach

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第8期14卷 574-582页

作者： Syed-shah KHALID Liang zhang xue-wei zhang Ke SUN Deepwater Engineering Research Center Harbin Engineering University

The objective of this study was to develop, as well as validate the strongly coupled method (two-way fluid structural interaction (FSI)) used to simulate the transient FSI response of the vertical axis tidal turbine (VATT) rotor, subjected to spatially varying inflow. Moreover, this study examined strategies on improving techniques used for mesh deformation that account for large displacement or deformation calculations. The blade's deformation for each new time step is considered in transient two-way FSI analysis, to make the design more reliable. Usually this is not considered in routine one-way FSI simulations. A rotor with four blades and 4-m diameter was modeled and numerically analyzed. We observed that two-way FSI, utilizing the strongly coupled method, was impossible for a complex model; and thereby using ANSYS-CFX and ANSYS-MECHANICAL in work bench, as given in ANSYS-WORKBENCH, helped case examples 22 and 23, by giving an error when the solution was run. To make the method possible and reduce the computational power, a novel technique was used to transfer the file in ANSYS-APDL to obtain the solution and results. Consequently, the results indicating a two-way transient FSI analysis is a time- and resource-consuming job, but with our proposed technique we can reduce the computational time. The ANSYS STRUCTURAL results also uncover that stresses and deformations have higher values for two-way FSI as compared to one-way FSI. Similarly, fluid flow CFX results for two-way FSI are closer to experimental results as compared to one-way simulation results. Additionally, this study shows that, using the proposed method we can perform coupled simulation with simple multi-node PCs (core i5).

关键词： Vertical axis tidal turbine Renewable energy Two-way fluid structure interaction (FSI)

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A line laser detection screen design and projectile echo power calculation in detection screen area

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Defence Technology（防务技术） 2022年第8期18卷 1405-1415页

作者： Han-shan Li Xiao-qian zhang xue-wei zhang Quan-min Guo School of Electronic and Information Engineering Xi'an Technological UniversityXi'an710021China

A line laser with high power as the background light source for the design of a new photoelectric detection target is proposed in this paper, aiming to improve the detection ability of the traditional photoelectric detection target under low background illumination. The laser emitted pulse waveform function and the laser echo pulse response function were used to establish the mathematical model of the reflected echo power of projectile in the detection area and derive the calculation function of minimum detectable echo power in the line laser detection screen, according to information of the line laser emitted power, incident angle of projectile, duration time and detection distance of projectile passing through the line laser detection screen. Calculations and experimental results showed that the design method of line laser detection screen and calculation model of laser echo power are reasonable, and the detection ability of line laser detection screen is obviously higher than that of traditional photoelectric detection screen, especially in low background illumination;at the same time, the designed line laser detection screen was used to combine a six line laser detection screen intersection test system, based on live ammunition for shooting. The test system is stable and able to obtain the dynamic parameters of the flying projectile, verifying that the design of the line laser detection screen in new photoelectric detection target can be suitable for shooting range test applications.

关键词： Line laser detection screen Photoelectric detection target Photoelectric detection receiver Echo power Projectile

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Altered amplitude of low-frequency fluctuations and default mode network connectivity in high myopia:a resting-state fMRI study

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International Journal of Ophthalmology(English edition) 2020年第10期13卷 1629-1636页

作者： xue-wei zhang Rong-Ping Dai Gang-wei Cheng wei-Hong zhang Qin Long Department of Radiology Translational Medical CenterPeking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China Department of Interventional Radiology Emergency General HospitalBeijing 100028China Department of Ophthalmology Translational Medical CenterPeking Union Medical College HospitalKey Laboratory of Ocular Fundus DiseasesChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100730China

AIM:To analyze changes in amplitude of low-frequency fluctuations(ALFFs)and default mode network(DMN)connectivity in the brain,using resting-state functional magnetic resonance imaging(rs-fMRI),in high myopia(HM)***:Eleven patients with HM(HM group)and 15 age-and sex-matched non-HM controls(non-HM group)were *** were calculated and compared between HM group and non-HM *** component analysis(ICA)was conducted to identify DMN,and comparisons between DMNs of two groups were ***-of-interest(ROI)-based analysis was performed to explore functional connectivity(FC)between DMN ***:Significantly increased ALFFs in left inferior temporal gyrus(ITG),bilateral rectus gyrus(REC),bilateral middle temporal gyrus(MTG),left superior temporal gyrus(STG),and left angular gyrus(ANG)were detected in HM group compared with non-HM group(all P<0.01).HM group showed increased FC in the posterior cingulate gyrus(PCC)/precuneus(preCUN)and decreased FC in the left medial prefrontal cortex(mPFG)within DMN compared with nonHM group(all P<0.01).Compared with non-HM group,HM group showed higher FC between mPFG and bilateral middle frontal gyrus(MFG),ANG,and MTG(all P<0.01).In addition,HM patients showed higher FC between PCC/(preCUN)and the right cerebellum,superior frontal gyrus(SFG),left pre CUN,superior frontal gyrus(SFG),and medial orbital of the superior frontal gyrus(ORB supmed;all P<0.01).CONCLUSION:HM patients show different ALFFs and DMNs compared with non-HM subjects,which may imply the cognitive alterations related to HM.

关键词： functional magnetic resonance imaging high myopia default mode network amplitude of lowfrequency fluctuation

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Effects of Stress Level and Stress State on Creep Ductility:Evaluation of Different Models

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Journal of Materials Science & Technology 2016年第8期32卷 695-704页

作者： Jian-Feng Wen Shan-Tung Tu Fu-Zhen Xuan xue-wei zhang Xin-Lin Gao Key Laboratory of Pressure Systems and Safety (Ministry of Education) School of Mechanical and Power Engineering East China University of Science and Technology Department of Materials Science and Engineering Texas A&M UniversityCollege Station Department of Mechanical Engineering Southern Methodist University

The last few decades have witnessed an increasing emphasis on the development of strain-based ap- proach for predicting the creep life or damage of components operating at elevated temperatures. Creep ductility, as a key parameter in this approach, may vary with a number of factors including strain rate, state of stress, operating temperature, material microstructure, etc. The present paper, however, is focused on reviewing the state-of-the-art understanding of the effects of stress level and stress state on the creep ductility. Mechanisms involving the void growth and coalescence are presented to describe the role of stress level in the variation of uniaxial creep ductility. The prediction capacity of existing empirical duc- tility models is also assessed in light of uniaxial test data. On the other hand, a vast body of multiaxial creep test data, collected from open literature, is utilized to examine the influence of the state of stress on the creep ductility. Then, a variety of multiaxial ductility factor models are introduced and evaluated with the available experimental data. Finally, a brief discussion on the dependence of creep ductility on the stress triaxiality and Lode parameter, predicted by numerical methods, is provided.

关键词： Creep Creep ductility Multiaxial stress state Ductility exhaustion

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Estimation of lunar FeO abundance based on imaging by LRO Diviner

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Research in Astronomy and Astrophysics 2016年第2期16卷 27-32页

作者： Xiao Tang Xiao-Xing Luo Yun Jiang Ao-Ao Xu Zhen-Chao Wang xue-wei zhang Yuan Chen Xiao-Meng zhang wei Cai Yun-Zhao Wu School of Geographic and Oceanographic Sciences Nanjing UniversityNanjing 210023China Key Laboratory of Planetary Sciences Chinese Academy of SciencesNanjing 210008China East China Mineral Exploration and Development Bureau Nanjing 210007China Macao University of Science and Technology MacaoChina School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023China

Understanding the abundance and distribution characteristics of FeO on the surface of the Moon is important for investigating its evolution. The current high resolution maps of the global FeO abundance are mostly produced with visible and near infrared reflectance spectra. The Christiansen Feature （CF） in mid-infrared has strong sensitivity to lunar minerals and correlates to major elements composing minerals. This paper investigates the possibility of mapping global FeO abundance using the CF values from the Diviner Lunar Radiometer Experiment aboard the Lunar Reconnaissance Orbiter （LRO） mission. A high correlation between the CF values and FeO abundances from the Apollo samples was found. Based on this high correlation, a new global map （±60°） of FeO was produced using the CF map. The results show that the global FeO average is 8.2 wt.%, the highland average is 4.7 wt.%, the global modal abundance is 5.4 wt.% and the lunar mare mode is 15.7 wt.%. These results are close to those derived from data provided by Clementine, the Lunar Prospector Gamma Ray Spectrometer （LP-GRS） and the Chang＇e-1 Interference Imaging Spectrometer （IIM）, demonstrating the feasibility of estimating FeO abundance based on the Diviner CF data. The near global FeO abundance map shows an enrichment of lunar major elements.

关键词： astrochemistry -- planets and satellites detection -- methods data analysis -- infrared general

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Ultra-wideband surface plasmonic bandpass filter with extremely wide upper-band rejection

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Chinese Physics B 2022年第11期31卷 303-308页

作者： xue-wei zhang Shao-Bin Liu Qi-Ming Yu Ling-Ling Wang Kun Liao Jian Lou College of Electronic and Information Engineering Key Laboratory of Radar Imaging and Microwave PhotonicsMinistry of EducationNanjing University of Aeronautics and AstronauticsNanjing 211106China

An ultra-wideband bandpass filter(BPF)with a wide out-of-band rejection based on a surface plasmonic waveguide(SPW)slotline with ring grooves is designed and analyzed.A paired microstrip-to-slotline transition is designed for quasiTEM to TM mode conversion by using a microstrip line with a circular pad and the slotline with the same circular *** mode conversion between the TM and the surface plasmon polariton(SPP)mode is realized by using a gradient slotline with ring grooves and an impedance matching *** upper cut-off frequencies of the passband can be adjusted by using these proposed SPP units,while the lower frequencies of the passband are created by using the microstrip-toslotline transitions to give an ultra-wideband *** dispersion curves of SPP units,electric field distribution,and the transmission spectra of the proposed ultra-wideband bandpass filter are all calculated and analyzed by the finite-difference time-domain(FDTD)*** simulated results show that the presented filter has good performance including a wide3-dB bandwidth of 149%from 0.57 GHz to 3.93 GHz,an extremely wide 40-dB upper-band rejection from 4.2 GHz to18.5 GHz,and low loss and high selectivity in the *** prove the design validity,a prototype of the BPF has been manufactured and measured,showing a reasonable agreement with simulation *** unique features of the proposed BPF may make it applicable for integrated circuit and plasmonic devices in microwave or THz frequency ranges.

关键词： surface plasmonic waveguide(SPW) bandpass filter out-of-band rejection ultra-wideband

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High-confinement ultra-wideband bandpass filter using compact folded slotline spoof surface plasmon polaritons

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Chinese Physics B 2022年第1期31卷 255-262页

作者： xue-wei zhang Shao-Bin Liu Ling-Ling Wang Qi-Ming Yu Jian-Lou Shi-Ning Sun College of Electronic and Information Engineering Key Laboratory of Radar Imaging and Microwave PhotonicsMinistry of EducationNanjing University of Aeronautics and AstronauticsNanjing 211106China AVIC Research Institute for Special Structures of Aeronautical Composite Aviation Key Laboratory of Science and Technology on High Performance Electromagnetic WindowsJinan 250023China

A novel bandpass filter(BPF)based on spoof surface plasmon polaritons(SSPPs)using a compact folded slotline structure is proposed and experimentally *** proposed novel SSPPs structure compared with a conventional plasmonic waveguide with slot line SSPPs unit structure at the same size,the considerable advantages in much lower asymptotic frequency with tight field confinement,which enable the proposed filter to be more miniaturization.A high-efficient mode conversion structure is designed to transition from TE-mode to SSPPs-mode by gradient slotline *** low-frequency stop-band can be committed with microstrip to slotline evolution on both sides of the dielectric,while the high-frequency cutoff band is realized by the proposed SSPPs *** influence of dispersion relation,electric field distribution,surface current,and structural parameters on the transmission characteristics of the proposed BPF are analyzed by finite difference time domain(FDTD).To validate the design concept,the prototype of the miniaturized SSPPs BPF has been manufactured and *** experimental results show high performance of the fabricated sample,in which the working in a range of 0.9 GHz-5.2 GHz with the relative bandwidth is 142%,the insertion loss less than 0.5 dB,the reflection coefficient less than-10 dB,and the group delay is less than one *** works provides a mirror for realizing the miniaturization of waveguides,and the application and development of high-confinement SSPPs functional devices in the microwave and THz regimes.

关键词： spoof surface plasmon polaritons(SSPPs) bandpass filter ultra-wideband high-confinement

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Design and implementation of web fast sharing platform of massive geological map

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Global Geology 2012年第2期15卷 114-119页

作者： YAN Yan xue Linfu zhang wei LI Wenqing College of Earth Sciences Jilin University Changchun 130026 China

It is still a laborious work to consult massive multidisciplinary geological maps which are scattered in different geological departments,and hard to give full play to the potential application value of geological map. Along with the network,the development of communication and computer technology,especially with the Web2.0 technology arisen,provides opportunities to the web for sharing of geological maps. Web fast sharing platform of massive geological maps( WSPGM) is based on the Flex technology development,using B/S architecture,with map navigation,search,display,security and other functions of the software system. Through the map pretreatment and asynchronous communication the system can display any size of geological map,and through the range limits,rights management,sharing system and watermark logo to take effective security on geological map. On the basis of this system,with the Jilin University web sharing system of geological map,the system can greatly improve the efficiency of using geological map. for research.

关键词： geological map sharing platform WSPGM

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Construction and evaluation of anti-gastrin immunogen based on P64K protein

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World Journal of Gastroenterology 2006年第13期12卷 2040-2046页

作者： Xiang-Hua Xiong Hong-Liang Zhao Chong xue wei zhang Bing-Fen Yang xue-Qin Yao Zhi-Min Liu Department of Microbiologic Engineering Beijing Institute of Biotechnology Beijing 100071 China

AIM： To construct two kinds of anti-gastrin immunogen based on P64K protein from Neisseria rneningitids and to compare their immunogenic effect. METHODS： G17P64K gene was cloned and ligated into pET28a plasmid, then transformed into BL21（DE3）. After inoculation of LB medium and IPTG induction, the recombinant protein was solubly expressed at a high level. The purification of G17P64K fusion protein was similar to that of P64K. An initial step of purification consisting of 30% saturated ammonium sulfate precipitation was done, Additional fine optimizations included phenyl-sepharose, G200 Sephadex gel filtration and Q-sepharose anion exchanger chromatography. Highly purified protein was obtained and sequenced at the N-terminal amino acid residues. Polypeptide was synthesized by Fmoc solid phase chemical method and cross-linked to carrier protein P64K and DT mutant by MBS method and then the rabbit anti-gastrin 17 antibody was prepared by immunizing rabbit with cross-linked and fused protein. The titer and the activity in vitro of antibody were assessed. RESULTS： G17P64K gene and the recombinant bacteria were obtained. After four steps purification, protein sample that has the purity above 90% was achieved. At the 84^th day after the first immunization, the titer of antibody against cross-linked protein reached 51 200. Evaluation of the antibody in vitro manifested that it had a high inhibitory activity on the growth of tumor cell SW480. CONCLUSION： The P64K-polypeptide cross-linked immunogen immunized rabbit and achieved a higher titer antibody against gastrin 17 than the G17P64K fusion protein immunogen, which could inhibit the growth of the tumor cell SW480.

关键词： Gastrin P64K protein therapeutic vaccine

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StreamJacobi： Efficient implementation of 2-D Jacobi on a stream processor

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通讯和计算机（中英文版） 2009年第1期6卷 6-15页

作者： zhang Ying LI Gen YANG xue-jun zhang wei FANG Xu-dong zhang He-ying School of Computer National University of Defense Technology Changsha Hunan 410073 China

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