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Extension of continuous scanning laser Doppler vibrometry measurement for complex structures with curved surfaces

Chinese Journal of Aeronautics 2020年第12期33卷 3220-3227页

作者： Cuihong LIU Chaoping ZANG biao zhou Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The continuous Scanning Laser Doppler Vibrometry(SLDV)developed on the base of the galvanometer scanner system has made it possible to quickly obtain the full field vibration responses within a rectangular area of the *** this paper,an arbitrary continuous scanning path generating method for Continuous Scanning Laser Doppler Vibometry(CSLDV)is further put forward in order to allow the CSLDV suitable for testing structures featured by complex shapes not just for regular *** the first step,the relationship between position of laser spot and the driving voltages of galvanometer scanner system has been described by a mathematical ***,a novel arbitrary scanning path generating strategy based on CSLDV is presented by deforming a normalization rectangular scanning path to an arbitrary continuous scanning *** mapping relation between the normalization rectangular scanning path and arbitrary continuous scanning path is established using the reference *** the second step,a compressor blade with curved surface was taken as an example for modal test using the proposed *** the same time,a validated experiment was performed in *** results show the mode shapes derived from the extended CSLDV are in agreement with those from SLDV and the Modal Assurance Criterion(MAC)between the two are all greater than *** also demonstrate the feasibility and effectiveness of the proposed method for CSLDV test and show strong potential on further practical engineering applications.

关键词： Arbitrary scanning path Continuous Scanning Laser Doppler Vibometry(CSLDV) Fitted polynomial Galvanometer scanner system Rectangular scanning path

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***-Yi Wang:Fighting leukemia

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Protein & Cell 2013年第7期4卷 483-484页

作者： Ming Li Guang-biao zhou Beijing Institutes of Life Science Chinese Academy of SciencesBeijing 100101China Institute of Zoology Chinese Academy of SciencesBeijing 100101China

***-Yi Wang(Fig.1),Academician of the Chinese Academy of Engineer-ing,a professor at the Medical School of Shanghai Jiao Tong University and the honorary director of the Shanghai Institute of Hematology,is best known ... 详细信息

关键词： leukemia acute Medical

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A structural health assessment method for shield tunnels based on torsional wave speed

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Science China(Technological Sciences) 2014年第6期57卷 1109-1120页

作者： zhou biao XIE XiongYao LI YongSheng Key Laboratory of Geotechnical & Underground Engineering Ministry of EducationTongji University Department of Geotechnical Engineering Tongji University

Following recent rapid developments in tunnel engineering in China,the heavy structural maintenance work of the future is likely to pose a great *** developed vibration-based health assessment and monitoring methods offer good prospects for large-scale structural monitoring,hidden surface detection and disease ***,because the dynamic properties of tunnels are sensitive to the coupling and damping effects of the surrounding soil,there is little relevant research on tunnel *** the PiP(pipe in pipe)model,the intrinsic tunnel modes and their response characteristics are investigated in this paper,and the degree to which the identification of these characteristics is influenced by mode superposition and the soil coupling effect are also *** response features of these flexible wave modes are found to be barely recognizable in a tunnel-soil coupled system,while the phase velocity of the torsional wave can be determined by combining phase spectrum analysis and the HHT(Hilbert-Huang transformation)method.A new structural health assessment method based on the torsional wave speed is therefore *** this method,the torsional wave speed is used to determine the tunnel structure’s global stiffness based on a newly developed dispersion *** calculated stiffness is then used to evaluate the tunnel’s structural service status.A field test was also carried out at a newly built tunnel to validate the proposed method;the tunnel structure’s Young’s modulus was obtained and was very close to the designed *** indicates that this method is an effective way to assess tunnel service conditions,and also provides a theoretical basis for future applications to health assessment of shield tunnels.

关键词： shield tunnel condition assessment torsional wave mode phase velocity

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Long Non-coding RNAs and Their Roles in Non-small-cell Lung Cancer

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Genomics, Proteomics & Bioinformatics 2016年第5期14卷 280-288页

作者： Ming-Ming Wei Guang-biao zhou State Key Laboratory of Membrane Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

As a leading cause of cancer deaths worldwide, lung cancer is a collection of diseases with diverse etiologies which can be broadly classified into small-cell lung cancer （SCLC） and non-small-cell lung cancer （NSCLC）. Lung cancer is characterized by genomic and epigenomic alterations; however, mechanisms underlying lung tumorigenesis remain to be elucidated. Long noncoding RNAs （lncRNAs） are a group of non-coding RNAs that consist of ≥ 200 nucleotides but possess low or no protein-coding potential. Accumulating evidence indicates that abnormal expression of lncRNAs is associated with tumorigenesis of various cancers, including lung cancer, through multiple biological mechanisms involving epigenetic, transcriptional, and post-transcriptional alterations. In this review, we highlight the expression and roles of lncRNAs in NSCLC and discuss their potential clinical applications as diagnostic or prognostic biomarkers, as well as therapeutic targets.

关键词： Long non-coding RNA Non-small-cell lung cancer Expression spectrum Biomarker Therapeutic resistance

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Nusselt number correlation for turbulent heat transfer of helium-xenon gas mixtures

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Nuclear Science and Techniques 2021年第11期32卷 119-133页

作者： biao zhou Yu Ji Jun Sun Yu-Liang Sun Institute of Nuclear and New Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China

A gas-cooled nuclear reactor combined with a Brayton cycle shows promise as a technology for highpower space nuclear power ***,a helium-xenon gas mixture with a molecular weight of14.5-40.0 g/mol is adopted as the working fluid to reduce the mass and volume of the *** Prandtl number for helium-xenon mixtures with this recommended mixing ratio may be as low as *** the convective heat transfer is closely related to the Prandtl number,different heat transfer correlations are often needed for fluids with various Prandtl *** studies have established heat transfer correlations for fluids with medium-high Prandtl numbers(such as air and water)and extremely lowPrandtl fluids(such as liquid metals);however,these correlations cannot be directly recommended for such helium-xenon mixtures without *** study initially assessed the applicability of existing Nusselt number correlations,finding that the selected correlations are unsuitable for helium-xenon *** establish a more general heat transfer correlation,a theoretical derivation was conducted using the turbulent boundary layer *** simulations of turbulent heat transfer for helium-xenon mixtures were carried out using Ansys *** on simulated results,the parameters in the derived heat transfer correlation are *** is found that calculations using the new correlation were in good agreement with the experimental data,verifying its applicability to the turbulent heat transfer for helium-xenon *** effect of variable gas properties on turbulent heat transfer was also analyzed,and a modified heat transfer correlation with the temperature ratio was *** on the working conditions adopted in this study,the numerical error of the property-variable heat transfer correlation was almost within 10%.

关键词： Gas-cooled nuclear reactor Space nuclear power Helium–xenon mixtures Convective heat transfer Nusselt number

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Experimental characterization of anisotropic tensile mechanical behavior of pure titanium tube

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Journal of Iron and Steel Research International 2019年第1期26卷 91-101页

作者： Jin-biao zhou Peng-yan Sun Chang-yu zhou Xiao-hua He School of Mechanical and Power Engineering Nanjing Technology UniversityNanjing 211816JiangsuChina

The anisotropic tensile mechanical properties of pure titanium(TA2)tubes were studied by means of theoretical analysis,finite element simulation and tensile *** on the stress analysis of circumferential tensile of TA2 tube,an equation for calculating the tangential force of circumferential tensile specimen was established,and the relationship among tangential force,friction and position of ring specimen was *** finite element simulation analysis of circumferential tensile process of TA2 ring specimen was carried out,which verified the tangential force equation derived from theoretical *** effect of gauge length and friction on necking and tensile load was analyzed,and the optimal gauge length was selected for the ring hoop tensile ***,the axial and circumferential tensile digital image correlation experiments were carried out to verify the theoretical and finite element simulation *** friction coefficient between TA2 tube and D-blocks(using Teflon lubricant)was determined by the inverse finite element method and the friction experiment,and the true stress-strain curve of TA2 tube was *** results show that the axial and circumfere ntial mechanical behaviors of TA2 tubes are significantly different and an isotropic.

关键词： Pure titanium(TA2)tube Ring hoop tensile test Digital image correlation An isotropy Strain rate

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Visualization of Melting of Antiferromagnetic Insulator Phase in Phase-Separated Manganite Film using Magnetic Force Microscopy

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Chinese Journal of Chemical Physics 2015年第6期28卷 -页

作者： Hai-biao zhou Yu-bin Hou Qing-you Lu Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 ChinaHigh Magnetic Field Laboratory Chinese Academy of Sciences and University of Science and Technology of China Hefei 230031 China High Magnetic Field Laboratory Chinese Academy of Sciences and University of Science and Technology of China Hefei 230031 China

The phase separation and magnetic-field-induced transition of the antiferromagnetic charge-ordered insulator (AFI) phase into the ferromagnetic metal (FM) phase in an anisotropically-strained manganite thin film is directly imaged using a home-built magnetic force microscope (MFM). The MFM images at 10 K show that the two competing phases already coexist in zero magnetic field. Remarkably anisotropic distribution of the stripe-like phase domains are observed, which can qualitatively account for the anisotropic transport. Above 2.2 T, the AFI phase starts to transform into FM phase gradually. The melting of AFI phase is completed at 3.2 T. The FM phase can be retained after the magnetic field is removed, suggesting the metastable nature of the AFI phase at this temperature.

关键词： Manganite Phase-separation Phase transition Magnetic force microscope

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Thickness regression for backfill grouting of shield tunnels based on GPR data and CatBoost&BO-TPE:A full-scale model test study

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Underground Space 2024年第4期17卷 100-119页

作者： Kang Li Xiongyao Xie biao zhou Changfu Huang Wei Lin Yihan zhou Cheng Wang Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China Key Laboratory of Geotechnical and Underground of Ministry of Education Tongji UniversityShanghai 200092China China Railway 15th Bureau Group Co.Ltd. Shanghai 200070China State Grid Shanghai Municipal Electric Power Company Shanghai 200122China

Ground penetrating radar(GPR)is a vital non-destructive testing(NDT)technology that can be employed for detecting the backfill grouting of shield *** achieve intelligent analysis of GPR data and overcome the subjectivity of traditional data processing methods,the CatBoost&BO-TPE model was constructed for regressing the grouting thickness based on GPR waveforms.A full-scale model test and corresponding numerical simulations were carried out to collect GPR data at 400 and 900 MHz,with known backfill grouting *** model test helps address the limitation of not knowing the grout body condition in actual field *** data were then used to create machine learning *** method of feature selection was proposed based on the analysis of feature importance and the electromagnetic(EM)propagation law in *** research shows that:(1)the CatBoost&BO-TPE model exhibited outstanding performance in both experimental and numerical data,achieving R^(2)values of 0.9760,0.8971,0.8808,and 0.5437 for numerical data and test data at 400 and 900 *** outperformed extreme gradient boosting(XGBoost)and random forest(RF)in terms of performance in the backfill grouting thickness regression;(2)compared with the full-waveform GPR data,the feature selection method proposed in this paper can promote the performance of the *** selected features within the 5–30 ns of the A-scan can yield the best performance for the model;(3)compared to GPR data at 900 MHz,GPR data at 400 MHz exhibited better performance in the CatBoost&BO-TPE *** indicates that the results of the machine learning model can provide feedback for the selection of GPR parameters;(4)the application results of the trained CatBoost&BO-TPE model in engineering are in line with the patterns observed through traditional processing methods,yet they demonstrate a more quantitative and objective nature compared to the traditional method.

关键词： Shield tunnel Backfill grouting GPR Model test gprMax Machine learning CatBoost&BO-TPE Thickness regression

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Nuclear alternating parity bands and transition rates in a model of coherent quadrupole–octupole motion in neutron-rich barium isotopes

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Nuclear Science and Techniques 2016年第6期27卷 150-154页

作者： Xing Zhang Yong Peng Chao-biao zhou Jia-Xing Li School of Physical Science and Technology Southwest UniversityChongqing 400715China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

Deformed even–even nuclei Barium isotopes with quadrupole–octupole deformations are investigated on the basis of a collective *** model describes energy levels of the yrast band with alternating parity in the neutron-rich^(140;142;144;146;148)*** structure of the alternating parity bands is examined by odd–even (△I=1) staggering *** analytical method of the collective model is proposed for the calculation of E2 transition probabilities in alternating spectra of the nuclei^(140;142;144;146)Ba.

关键词：运动模型钡同位素丰中子同位素四极奇偶校验带相干 E2跃迁几率

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Experimental study of the mechanism of nanofluid in enhancing the oil recovery in low permeability reservoirs using microfluidics

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Petroleum Science 2023年第1期20卷 382-395页

作者： Kang Wang Qing You Qiu-Ming Long biao zhou Pan Wang School of Energy Resources China University of GeosciencesBeijing100083China School of Petroleum Engineering China University of PetroleumQingdao266580ShandongChina Chengdu Natural Gas Chemical General Factory Chengdu610213SichuanChina

Due to the low porosity and low permeability in unconventional reservoirs,a large amount of crude oil is trapped in micro-to nano-sized pores and throats,which leads to low oil *** have great potential to enhance oil recovery(EOR)in low permeability *** this work,the regulating ability of a nanofluid at the oil/water/solid three-phase interface was *** results indicated that the nanofluid reduced the oil/water interfacial tension by two orders of magnitude,and the expansion modulus of oil/water interface was increased by 77% at *** addition,the solid surface roughness was reduced by 50%,and the three-phase contact angle dropped from 135(oil-wet)to 48(water-wet).Combining the displacement experiments using a 2.5D reservoir micromodel and a microchannel model,the remaining oil mobilization and migration processes in micro-to nano-scale pores and throats were *** was found that the nanofluid dispersed the remaining oil into small oil droplets and displaced them via multiple mechanisms in porous ***,the high strength interface film formed by the nanofluid inhibited the coalescence of oil droplets and improved the flowing *** results help to understand the EOR mechanisms of nanofluids in low permeability reservoirs from a visual perspective.

关键词： Nanofluid EOR mechanism Micromodel Low permeability Three-phase interface

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