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Passive VIV Reduction of An Inclined Flexible Cylinder by Means of helical Strakes with Round-Section

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China Ocean Engineering 2018年第4期32卷 413-421页

作者： XU Wan-hai QIN Wen-qi he Ming GAO Xi-feng State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University

A series of experimental tests of passive VIV suppression of an inclined flexible cylinder with round-sectioned helical strakes were carried out in a towing tank. During the tests, the cylinder models fitted with and without helical strakes were towed along the tank. The towing velocity ranged from 0.05 to 1.0 m/s with an interval of 0.05 m/*** different yaw angles(a=0°, 15°, 30° and 45°), defined as the angle between the axis of the cylinder and the plane orthogonal of the oncoming flow, were selected in the experiment. The main purpose of present experimental work is to further investigate the VIV suppression effectiveness of round-sectioned helical strakes on the inclined flexible cylinder. The VIV responses of the smooth cylinder and the cylinder with square-sectioned strakes under the same experimental condition were also presented for comparison. The experimental results indicated that the roundsectioned strake basically had a similar effect on VIV suppression compared with the square-sectioned one, and both can significantly reduce the VIV of the vertical cylinder which corresponded to the case of a=0°. But with the increase of yaw angle, the VIV suppression effectiveness of both round-and square-section strakes deteriorated dramatically, the staked cylinder even had a much stronger vibration than the smooth one did in the in-line(IL)direction.

关键词： VIV suppression helical strakes inclined flexible cylinder yaw angle round-section

The alleviation of ammonium toxicity in plants

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Journal of Integrative Plant Biology 2023年第6期65卷 1362-1368页

作者： Chengbin Xiao Yuan Fang Suomin Wang Kai he Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations School of Life SciencesLanzhou UniversityLanzhou 730000China State Key Laboratory of Grassland Agro‐Ecosystems College of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou 730000China

Nitrogen(N)is an essential macronutrient for plants and profoundly affects crop yields and ***(NH4+)and nitrate(NO3-)are major inorganic N forms absorbed by plants from the surrounding ***,NH4+is usually toxic to plants when it serves as the sole or dominant N *** is thus important for plants to coordinate the utilization of NH4+and the alleviation of NH4+*** fully decipher the molecular mechanisms underlying how plants minimize NH4+toxicity may broadly benefit agricultural *** the current minireview,we attempt to discuss recent discoveries in the strategies for mitigating NH4+toxicity in plants,which may provide potential solutions for improving the nitrogen use efficiency(NUE)and stress adaptions in crops.

关键词： alleviation ammonium toxicity channel nitrogen NUE transporter

Influence of secondary lining thickness on mechanical behaviours of double-layer lining in large-diameter shield tunnels

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Underground Space 2024年第5期18卷 130-150页

作者： Shimin Wang Xuhu he Xiaoyu Peng Ya Wang Zhengxin Li Zihan Song Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China

In large-diameter shield tunnels,applying the double-layer lining structure can improve the load-bearing properties and maintain the stability of segmental *** secondary lining thickness is a key parameter in the design of a double lining structure,which is worth being *** on an actual large-diameter shield tunnel,loading model tests are carried out to investigate the effect of the secondary lining thickness on the mechanical behaviours of the double lining *** test results show that within the range of secondary lining thicknesses discussed,the load-bearing limit of the double-layer lining increases with growing secondary lining *** a passive support,the secondary lining acts as an auxiliary load-bearing structure by contacting the *** changes in secondary lining thickness have a significant effect on the contact state between the segment and secondary lining,with both the contact pressure level and the contact area between the two *** double-layer lining structures in large-diameter shield tunnels,it is proposed that the stiffness of the secondary lining needs to be matched to the stiffness of the segment,as this allows them to have a coordinated deformation and a good joint load-bearing effect.

关键词： Large-diameter shield tunnels Double-layer lining structure Secondary lining thickness Stiffness matching Similar model test

∑HfF_5^- current monitoring with off-axis Faraday cup in AMS measurement of ^(182)Hf at CIAE

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Nuclear Science and Techniques 2012年第4期23卷 199-202页

作者： LI Zhenyu he Ming DONG Kejun LI Chaoli he Guozhu he Xianwen ZHANG Wei HU Hao ZheNG Guowen LI heng WU Shaoyong JIANG Shan China Institute of Atomic Energy Beijing 102413China College of Physics Science and Technology Guangxi UniversityNanning 530004China

In order to reduce the systematic uncertainties caused by the sequential injection in AMS measurement of ^(182)Hf,a technique for instantaneous monitoring of off-axis∑HfF_5^- current was developed in the AMS laboratory at China Institute of Atomic Energy(CIAE).The stability and reliability of this method have been experimentally *** a result,the accuracy for AMS measurement of^(182)Hf was significantly improved.

关键词：中国原子能科学研究院 AMS 测量法拉第杯离轴 HF 监控电流

The EFFECT OF BLENDING SEQUENCE ON PHASE MORPHOLOGY OF NYLON 6/ABS/SMA BLENDS

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Chinese Journal of Polymer Science 2008年第1期26卷 73-80页

作者： Qin, Shu-Hao Yu, Jie Zheng, Qiang he, Min Zhu, Hong Zhejiang Univ Dept Polymer Sci & Engn Hangzhou 310027 Peoples R China Natl Engn Res Ctr Compounding & Modificat Polymer Guiyang 550025 Peoples R China

The preparation process-dependent phase morphology of blends composed of nylon 6 and acrylonitrile-butadiene- styrene(ABS)over a composition range of 30-70 wt% using a styrene-maleic anhydride(SMA)copolymer as the compatibilizing agent with a constant content(5phr)was *** results of the scanning electron microscope (SEM)observation revealed that compared with the binary blends of nylon 6 and ABS,the existence of SMA caused a composition shift of phase inversion to a higher weight fraction of ny...

关键词： Nylon 6 ABS Morphology Blending sequence Dynamic mechanical properties

Generation of Mathieu beams using angular pupil modulation

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Chinese Physics B 2018年第12期27卷 277-281页

作者： Zhijun Ren Jinping he Yile Shi Key Laboratory of Optical Information Detecting and Display Technology Zhejiang Normal UniversityJinhua 321004China National Astronomical Observatones/Nanjing Institute of Astronomical Optics &Technology Chinese Academy of SciencesNanjing 210042China

By using an amplitude-type spatial light modulator to load angular spectrum of Mathieu function distribution along a narrow annular pupils, the Durnin’s experimental setup is extended to generate various types of Mathieu beams. As a special type of Mathieu beams, Bessel beams are also generated using this optical setup. Furthermore, the optical morphology of the Mathieu beams family are also presented and analyzed.

关键词： diffraction-free beams Mathieu beams angular modulation spatial light modulator

Ground Rotation Band of a 6-Boson System

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Chinese Physics Letters 1999年第12期16卷 891-893页

作者： BAO Cheng-guang HUI Ping he Yan-zhang Center of Theoretical Nuclear Physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000 Department of Physics Zhongshan UniversityGuangzhou 510275 Department of Physics Educational College of GuangdongGuangzhou 510310

A 6-boson system has been qualitatively studied based on symmetry consideration. Emphasis is placed on the ground rotation band based on the octahedron structure. In this band the L = 1 , 2, and 3 states are found to ... 详细信息

关键词： structure. state. rotation

Exploration of Target Spaces in the Human Genome for Protein and Peptide Drugs

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Genomics, Proteomics & Bioinformatics 2022年第4期20卷 780-794页

作者： Zhongyang Liu Honglei Li Zhaoyu Jin Yang Li Feifei Guo Yangzhige he Xinyue Liu Yaning Qi Liying Yuan Fuchu he Dong Li State Key Laboratory of Proteomics Beijing Proteome Research CenterNational Center for Protein Sciences(Beijing)Beijing Institute of LifeomicsBeijing 102206China School of Basic Medical Sciences Anhui Medical UniversityHefei 230032China College of Chemistry and Environmental Science Hebei UniversityBaoding 071002China Suzhou Geneworks Technology Co. Ltd.Suzhou 215028China Institute of Chinese Materia Medica China Academy of Chinese Medical SciencesBeijing 100700China Department of Medical Research Center Peking Union Medical College HospitalChinese Academy of Medical Science&Peking Union Medical CollegeBeijing 100730China College of Life Sciences Hebei UniversityBaoding 071002China

After decades of development,protein and peptide drugs have now grown into a major drug class in the *** identification and validation are crucial for the discovery of protein and peptide drugs,and bioinformatics prediction of targets based on the characteristics of known target proteins will help improve the efficiency and success rate of target ***,owing to the developmental history in the pharmaceutical industry,previous systematic exploration of the target spaces has mainly focused on traditional small-molecule drugs,while studies related to protein and peptide drugs are ***,we systematically explore the target spaces in the human genome specifically for protein and peptide *** with other proteins,both successful protein and peptide drug targets have many special characteristics,and are also significantly different from those of small-molecule drugs in many *** on these features,we develop separate effective genome-wide target prediction models for protein and peptide ***,a user-friendly web server,Predictor Of Protein and Pept Ide drugs’therapeutic Targets(POPPIT)(http://***/),is established,which provides not only target prediction specifically for protein and peptide drugs but also abundant annotations for predicted targets.

关键词： Protein drug Peptide drug Target analysis Target prediction Web server

Use of the epitaxial MTBs as a 1D gate(Lg=0.4 nm)for the construction of scaling down two-dimensional field-effect transistors

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Journal of Semiconductors 2024年第10期45卷 1-2页

作者： Youla Yang Daixuan Wu he Tian Tian-Ling Ren School of Integrated Circuit Tsinghua UniversityBeijing 100083China School of Instrument Science and Technology Xi'an Jiaotong UniversityXi'an 710049China

In recent years,there has been a significant increase in research focused on the growth of large-area single *** et al.[1]recently achieved the growth of large-area monolayers of transition-metal chalcogenides through assisted *** quality of molecular beam epitaxy(MBE)-grown two-dimensional(2D)materials can be greatly enhanced by using sacrificial species deposited simultaneously from an electron beam evaporator during the growth *** technique notably boosts the nucleation rate of the target epitaxial layer,resulting in large,homogeneous monolayers with improved quasiparticle lifetimes and fostering the development of epitaxial van der Waals ***,micrometer-sized silver films have been formed at the air-water interface by directly depositing electrospray-generated silver ions onto an aqueous dispersion of reduced graphene oxide under ambient conditions[2].

关键词： silver epitaxial dimensional