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Computational analysis of fluid-structure interaction in case of fish swimming in the vortex street

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Journal of Hydrodynamics 2021年第4期33卷 747-762页

作者： Lang Yan Xing-hua Chang Nian-hua Wang Run-yu Tian Lai-ping Zhang Wei liu College of Aerospace Science and Engineering National University of Defense TechnologyChangsha410073China Unmanned Systems Research Center National Innovation Institute of Defense TechnologyBeijing100071China China Aerodynamics Research and Development Center State Key Laboratory of AerodynamicsMianyang621000China Hypervelocity Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang621000China

The fluid-structure interaction (FSI) in case of fish swimming in the vortex street is investigated by numerical simulations. The vortex street is generated by a D-section cylinder. A 2-D fish model is placed on the downstream centerline of the bluff cylinder at a distance of 4 diameters away from the center of the cylinder. To simulate the fish body undulation and movement, the moving mesh is generated by a coupling approach based on the radial basis function and the overset grid technology. The Navier-Stokes equation in the arbitrary Lagrangian-Eulerian form is solved by coupling with the kinematics equation. Three cases are investigated: in a stationary position without deformation, a passive locomotion without deformation, and an active deformation based on the Kármán gait model. The results indicate that the fish body is acted by an alternating force and moment when it is located in the centerline of the vortex street. Furthermore, the fish could extract sufficient kinetic energy to overcome the drag under suitable conditions even when it keeps rigid and out of the suction zone. When the fish body undulates based on the Kármán gait model, the interaction is evidently shown between the fish body and the vortices. The theoretical analysis demonstrates that the lateral force and the moment acting on the fish body vary in a cosine formula, with the lateral translation and the body rotation as a result. This study focuses on the behavior of the fish body in the bluff cylinder wake and reproduces some phenomena observed in the experiments. Besides, the Kármán gait model is also theoretically analyzed, for the further exploration of the FSI mechanism in case of fish swimming.

关键词： Computational analysis fluid-structure interaction(FSI) Kármán gait vortex street passive locomotion fish swimming

Genome-wide analysis of OVATE family proteins in cucumber(Cucumis sativus L.)

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Journal of Integrative Agriculture 2022年第5期21卷 1321-1331页

作者： HAN Li-jie SONG xiao-fei WANG Zhong-yi liu xiao-feng YAN Li-ying HAN De-guo ZHOU Zhao-yang ZHANG xiao-lan State Key Laboratories of Agrobiotechnology/Beijing Key Laboratory of Growth and Developmental Regulation for Protected Vegetable Crops/MOE Joint Laboratory for International Cooperation in Crop Molecular Breeding/China Agricultural University Beijing 100193P.R.China Analysis and Testing Centre Hebei Normal University of Science&TechnologyQinhuangdao 066004P.R.China College of Horticulture Science and Technology Hebei Normal University of Science&TechnologyQinhuangdao 066004P.R.China Key Laboratory of Biology and Genetic Improvement of Horticultural Crops of Northeast Region Ministry of Agriculture and Rural Affairs/College of Horticulture&Landscape ArchitectureNortheast Agricultural UniversityHarbin 150030P.R.China

OVATE family proteins(OFPs)are plant-specific proteins with a conserved OVATE domain that regulate plant growth and *** OFPs have been studied in several species,their biological functions remain largely unknown in cucumber(Cucumis sativus L.).This study identified 19 Cs OFPs distributed on seven chromosomes in *** Cs OFP genes were expressed in reproductive organs,but with different expression *** expression of Cs OFP12-16c in Arabidopsis resulted in shorter and blunt *** overall results indicated that Cs OFP12-16c regulates silique development in Arabidopsis and may have a similar function in cucumber.

关键词： cucumber OVATE family proteins expression pattern Cs OFP12-16c fruit development

Free-radical evolution and decay in cross-linked polytetrafluoroethylene irradiated by gamma-rays

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Nuclear Science and Techniques 2022年第5期33卷 113-125页

作者： Fei-Xiang Sha Guo-Jun Cheng Zi-Yue Xuan Yang liu Wei-Hua liu xiao-Dong Zhang Zhong-Feng Tang School of Materials Science and Engineering Anhui University of Science and TechnologyHuainan 232000China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China National Key Laboratory of Materials Behavior and Evaluation Technology in Space Environment Harbin Institute of TechnologyHarbin 150001China University of Chinese Academy of Sciences Beijing 100049China

Electron spin resonance techniques were employed to investigate the effects of the absorbed dose and post-irradiation conditions on the evolution and decay of free-radicals in cross-linked polytetrafluoroethylene(XPTFE),induced byγ-ray ***-end free-radicals,chain alkyl free-radicals,and tertiary alkyl free-radicals were detected when XPTFE was irradiated under Ar *** corresponding peroxy free-radicals were formed upon exposure of irradiated XPTFE to air;the freeradicals concentration first increased linearly with increasing absorbed dose and then gradually *** free-radicals yield under air atmosphere was greater than that under Ar,and the peroxy free-radicals were preserved for a relatively long time when irradiated XPTFE was stored under air *** chain alkyl free-radicals may be converted to chain end free-radicals byβ-scission,while chain end free-radicals are more sensitive to oxygen than chain alkyl *** the annealing temperature was raised above the a-transition temperature of XPTFE,the decay of the free-radicals was greatly affected and accelerated by the motion of the molecules over the long range.

关键词： Polytetrafluoroethylene Cross-linked polytetrafluoroethylene Electron spinresonance Decay Radiation c-ray

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仿真系统可靠性研究

系统仿真学报 2006年第Z2期18卷 48-51页

作者：郑利平刘晓平合肥工业大学系统仿真中心

可靠性是评价仿真系统质量和性能的一个重要指标。首先介绍了仿真可靠性研究的现状,然后对仿真可靠性和仿真可靠度进行了定义,并将它和仿真可信性进行了对比,分析了仿真可靠性研究的意义,最后给出对于仿真可靠性分析的一个基本框架,并... 详细信息

可靠性是评价仿真系统质量和性能的一个重要指标。首先介绍了仿真可靠性研究的现状,然后对仿真可靠性和仿真可靠度进行了定义,并将它和仿真可信性进行了对比,分析了仿真可靠性研究的意义,最后给出对于仿真可靠性分析的一个基本框架,并简述了仿真系统可靠性的分析方法。

关键词：仿真性能评估可靠性可信性 VV&A

Wnt/β-catenin signalling:function,biological mechanisms,and therapeutic opportunities

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Signal Transduction and Targeted Therapy 2022年第2期7卷 379-401页

作者： Jiaqi liu Qing xiao Jiani xiao Chenxi Niu Yuanyuan Li xiaojun Zhang Zhengwei Zhou Guang Shu Gang Yin Department of Pathology Xiangya HospitalSchool of Basic Medical SciencesCentral South UniversityChangsha 410013China Department of Histology and Embryology School of Basic Medical SciencesCentral South UniversityChangsha 410013China China-Africa Research Center of Infectious Diseases School of Basic Medical sciencesCentral South UniversityChangsha 410013China

The Wnt/β-catenin pathway comprises a family of proteins that play critical roles in embryonic development and adult tissue *** deregulation of Wnt/β-catenin signalling often leads to various serious diseases,including cancer and non-cancer *** many articles have reviewed Wnt/β-catenin from various aspects,a systematic review encompassing the origin,composition,function,and clinical trials of the Wnt/β-catenin signalling pathway in tumour and diseases is *** this article,we comprehensively review the Wnt/β-catenin pathway from the above five aspects in combination with the latest ***,we propose challenges and opportunities for the development of small-molecular compounds targeting the Wnt signalling pathway in disease treatment.

关键词： diseases homeostasis cancer

Learn Robust Pedestrian Representation Within Minimal Modality Discrepancy for Visible-Infrared Person Re-Identification

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Journal of Computer Science & Technology 2022年第3期37卷 641-651页

作者： Yu-Jie liu Wen-Bin Shao xiao-Rui Sun College of Computer Science and Technology China University of Petroleum(East China)Qingdao 266580China

Visible-infrared person re-identification has attracted extensive attention from the community due to its potential great application prospects in video *** are huge modality discrepancies between visible and infrared images caused by different imaging *** studies alleviate modality discrepancies by aligning modality distribution or extracting modality-shared features on the original ***,they ignore a key solution,i.e.,converting visible images to gray images directly,which is efficient and effective to reduce modality *** this paper,we transform the cross-modality person re-identification task from visible-infrared images to gray-infrared images,which is named as the minimal modality *** addition,we propose a pyramid feature integration network(PFINet)which mines the discriminative refined features of pedestrian images and fuses high-level and semantically strong features to build a robust pedestrian ***,PFINet first performs the feature extraction from concrete to abstract and the top-down semantic transfer to obtain multi-scale feature ***,the multi-scale feature maps are inputted to the discriminative-region response module to emphasize the identity-discriminative regions by the spatial attention ***,the pedestrian representation is obtained by the feature *** experiments demonstrate the effectiveness of PFINet which achieves the rank-1 accuracy of 81.95%and mAP of 74.49%on the multi-all evaluation mode of the SYSU-MM01 dataset.

关键词： person re-identification modality discrepancy discriminative feature

Exosomes in esophageal cancer: A review on tumorigenesis,diagnosis and therapeutic potential

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World Journal of Clinical Cases 2019年第8期7卷 908-916页

作者： Lin-Lin Su xiao-Jing Chang Huan-Di Zhou liu-Bing Hou xiao-Ying Xue Department of Radiotherapy The Second Hospital of Hebei Medical University Department of Central Laboratory The Second Hospital of Hebei Medical University

Exosomes are nanovesicles secreted from various types of cells and can be isolated from various bodily fluids, such as blood and urine. The number and molecular contents, including proteins and RNA of exosomes, have been shown to reflect their parental cell origins, characteristics and biological behaviors. An increasing number of studies have demonstrated that exosomes play a role in the course of tumorigenesis, diagnosis, treatment and prognosis, although its precise functions in tumors are still unclear. Moreover, owing to a lack of a standard approach, exosomes and its contents have not yet been put into clinical practice successfully. This review aims to summarize the current knowledge on exosomes and its contents in esophageal cancer as well as the current limitations/challenges in its clinical application, which may provide a basis for an all-around understanding of the implementation of exosomes and exosomal contents in the surveillance and therapy of esophageal cancer.

关键词： Exosome Esophageal cancer Tumorigenesis Biomarker Therapeutic potential

The generation kinetics of natural gases in the Kela-2 gas field from the Kuqa Depression, Tarim Basin, northwestern China

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Chinese Journal Of Geochemistry 2013年第2期32卷 157-169页

作者： LI Xianqing FENG Songbao xiao Xianming TANG Yongchun xiao Zhongyao MI Jingkui TIAN Hui liu Dehan SHEN Jiagui State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Environmental and Energy Research Center California Institute of Technology 738 Arrow Grand Circle Covina California 91722 USA Power Research Institute of Exploration and Development Tarim Oilfield CompanyPetroChina Research Institute of Petroleum Exploration and Development PetroChina

The Kela-2 gas field, found in the Kuqa Depression of the Tarim Basin, northwestern China, is a large-sized dry gas field (C1 /C1-5 =0.992 0.999) and characterized by ultra-high pressure (pressure factor up to 2.0 2.2). The pyrolysis experiment was carried out under isothermal gold-tube closed system, with samples collected from the Jurassic coal, Jurassic mudstone and Triassic mudstone in the Kuqa Depression. The result of gas yield showed that the Middle and Lower Jurassic source rocks have higher gas generation potential than the Triassic source rocks. The kinetic modeling of gas generation and methane carbon isotope fractionation suggested that the Kela-2 gases belong to the products of high-over mature stages and were mainly derived from the Middle and Lower Jurassic coal-bearing strata. The Triassic source rocks made a minor contribution to the Kela-2 gases. The Kela-2 gases chiefly generated from coal-bearing source rocks with R o values from 1.3% to 2.5%, and thus primarily accumulated after 5 Ma.

关键词：克拉2气田塔里木盆地中国西北部天然气产量动力学建模库车坳陷煤系烃源岩含煤地层

Chemical vapor deposition synthesis and Raman scattering investigation of quasi-one-dimensional ZrS_(3)nanoflakes

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Nano Research 2023年第7期16卷 10567-10572页

作者： Yang Chen Yuanyuan Jin Junqiang Yang Yizhang Ren Zhuojun Duan xiao liu Jian Sun Song liu Xukun Zhu Xidong Duan Institute of Chemical Biology and Nanomedicine(ICBN) College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Hunan Key Laboratory of Two-Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China School of Physics and Electronics Central South UniversityChangsha 410083China

Quasi-one-dimensional ZrS_(3)nanoflakes attract intense interest attributed to their superior electrical and optical anisotropy,stemming from the low symmetry in the crystal ***,the conventional chemical vapor transport method for synthesizing bulk ZrS_(3)is limited by morphology and size *** is highly desirable to propose a facile way to precisely synthesize ZrS_(3)*** this work,the chemical vapor deposition method is proposed as a feasible way to synthesize ZrS_(3)*** effects of various substrates and temperatures on ZrS_(3)synthesis have been *** the as-grown ZrS_(3),good crystallinity is confirmed with X-ray diffraction and transmission electron *** structure and interlayer coupling are investigated with Raman scattering *** strong in-plane anisotropy and interlayer coupling of the ZrS_(3)nanoflakes are illustrated with angle-resolved Raman spectroscopy and temperature-dependent Raman characterization,*** study demonstrates a feasible way for the synthesis of transition metal trisulfides,which may shed new light on the research of other two-dimensional anisotropic transition metal materials.

关键词： quasi-one-dimensional ZrS_(3)nanoflakes chemical vapor deposition method in-plane anisotropy interlayer coupling