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Responses of HFR-LWC beams under close-range blast loadings accompanying membrane action

Defence Technology（防务技术） 2020年第6期16卷 1167-1187页

作者： Wan-xiang Chen Li-sheng luo Zhi-kun Guo Peng yuan School of Civil Engineering Sun Yat-Sen UniversityZhuhai519082China State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of PLANanjing210007China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai519082China

The load-carrying capacities and failure patterns of reinforced concrete components can be significantly changed by membrane ***,limited work has been carried out to investigate the blast resistance of Hybrid Fiber Reinforced Lightweight Aggregate Concrete(HFR-LWC)members accompanying membrane *** paper presents a theoretical approach to quantitatively depicting the membrane behavior and its contribution on the behavior of HFR-LWC beams under close-range blast loadings,and the suitability of the proposed model is validated by a series of field *** improved Single-Degree-of-Freedom(SDOF)model was employed to describe the dynamic responses of beam-like members under blast loadings accompanying membrane action,where the mass-load coefficient is determined according to the nonuniformly distributed load induced by close-range explosion,and the membrane action is characterized by an in-plane(longitudinal)force and a resisting *** elastoplastic and recovery responses of HFR-LWC beams under the combined action of blast load and membrane force were analyzed by the promoted model.A specially built end-constrain clamp was developed to provide membrane action for the beam member when they are subjected to blast load *** is demonstrated that the analytical displacement-time histories are in good agreement with experimental results before peak deflections and that the improved SDOF model is an acceptable tool for predicting the behavior of HFR-LWC beams under blast loadings accompanying membrane action.

关键词： Blast load Membrane action HFR-LWC beam Dynamic response Experimental study

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Covert communication with beamforming over MISO channels in the finite blocklength regime

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Science China(Information Sciences) 2021年第9期64卷 187-201页

作者： Xinchun yu yuan luo Wen CHEN School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University

This paper considers beamforming techniques for covert communication over multiple input single output(MISO) channels with finite blocklength. We first show that the optimal input distribution for covert communication over complex Gaussian channels is circular symmetric complex Gaussian. By reviewing our previous results on the throughput of Gaussian random coding over additive white Gaussian noise(AWGN) channels, the achievability and converse bounds on the attainable throughput over MISO channels are analyzed. Then, the optimal beamforming strategies and their relationship with the transmitting power are thoroughly investigated in a variety of situations in terms of several types of channel state information available at both ends of the system. We reveal the fact that the maximal allowable transmit power is not constrained by covertness requirement when there is full channel information of the adversary, while there is an upper bound of the transmit power which is based on beamforming and an outage-based covertness criterion if there is only partial channel information of the adversary. Finally, numerical results are presented to show that the throughput of covert communication can be increased notably by adopting a proper beamforming strategy in MISO channels in comparison with the single antenna case.

关键词： beamforming circular symmetric complex Gaussian covert communication MISO channels power control

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Mechanical Strong,Highly Adhesive,Recyclable and Transparent Supramolecular Silicone Coatings with Easy Water/Oil Sliding

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Chinese Journal of Polymer Science 2023年第11期41卷 1796-1804,I0010页

作者： yu-Cai Lin Feng Chen Shou-Bin Yang Shu-yue Gong yu-Xiang luo Fang-Fang Wei Fu-Chuan Ding Wei-Bin Bai Rong-kun Jian Fujian Key Laboratory of Polymer Materials Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical EngineeringCollege of Chemistry and Materials ScienceFujian Normal UniversityFuzhou 350007China

Traditional silicone materials have poor mechanical properties,poor interfacial adhesion and lack the ability to be reprocessed or ***,we developed a novel strategy of incorporating dynamic noncovalent bonds(2-amino-4-hydroxy-6-methylpyrimidine(UPy))into side chain of silicone backbones to construct supramolecular silicone poly(urea-urethane)(SSPu)coatings with excellent mechanical performance,strong interfacial adhesion and multiple time recycling ***,the prepared SSPu is endowed with simultaneously enhanced stiffness(272.0±23.2 MPa)and toughness(8.0±2.0 MJ·m^(-3)).Besides,SSPu shows strong interfacial adhesion(up to 9.0±1.3 MPa)to diverse substrate(stainless steel,aluminum,copper,epoxy and glass)with long term ***,SSPu exhibits excellent multirecyclability and reusability without significantly decrease of its *** addition to the abovementioned features,the enrichment of siloxane backbones in the surface layer endows SSPu with robust repellency to water/*** strategy provides a powerful route to fabricate a new multifunctional silicone *** is highly anticipated that our strategy can effectively extend the service life of silicone coating which can be applied in a wide variety of areas including self-cleaning,antifouling.

关键词： Silicong coating Supramolecular Adhesion Recyclable

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What is the right way to quench star formation in semi-analytic models of galaxy formation?

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Research in Astronomy and Astrophysics 2017年第2期17卷 7-16页

作者： yu luo Xi Kang Purple Mountain Observatory the Partner Group of MPI für Astronomie Graduate School University of the Chinese Academy of Sciences

Semi-analytic models of galaxy formation are powerful tools to study the evolution of a galaxy population in a cosmological context. However, most models overpredict the number of low- mass galaxies at high redshifts and the colors of model galaxies are not right in the sense that low-mass satellite galaxies are too red and centrals are too blue. The recent version of the L-Galaxies model by Henriques et al. （H15） is a step forward to solve these problems by reproducing the evolution of stellar mass function and the overall fraction of red galaxies. In this paper we compare the two model predictions of L-Galaxies （the other is Guo et al., G13） to SDSS data in detail. We find that in the H15 model the red fraction of central galaxies now agrees with the data due to their implementation of strong AGN feedback, but the stellar mass of centrals in massive halos is now slightly lower than what is indicated by the data. For satellite galaxies, the red fraction of low-mass galaxies （log M./M~ 〈 10） also agrees with the data, but the color of massive satellites （10 〈 logM,/M~ 〈 11） is slightly bluer. The correct color of centrals and the bluer color of massive satellites indicate that quenching in massive satellites is not strong enough. We also find that there are too many red spirals and less bulge-dominated galaxies in both H15 and G13 models. Our results suggest that additional mechanisms, such as more minor mergers or disk instability, are needed to slightly increase the stellar mass of the central galaxy in massive galaxies, mainly in the bulge component, and bulge dominated galaxies will be quenched not only by minor mergers, but also by some other mechanisms.

关键词： galaxies: evolution -- galaxies: formation- galaxies: star formation

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Nonlinear interaction mechanisms of disturbances in supersonic flat-plate boundary layers

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Science China(Physics,Mechanics & Astronomy) 2014年第11期57卷 2141-2151页

作者： yu Min luo JiSheng Department of Mechanics Tianjin University

Due to the complexity of compressible flows,nonlinear hydrodynamic stability theories in supersonic boundary layers are not *** order to reveal the nonlinear interaction mechanisms of the rapidly amplified 3-D disturbances in supersonic boundary layers at high Mach numbers,the nonlinear evolutions of different disturbances in flat-plate boundary layers at Mach number 4.5,6 and 8 are analyzed by numerical *** can be concluded that the 3-D disturbances are amplified rapidly when the amplitude of the 2-D disturbance reaches a certain *** most rapidly amplified 3-D disturbances are Klebanoff type(K-type)disturbances which have the same frequency as the 2-D *** these K-type 3-D disturbances,the disturbances located at the junction of upper branch and lower branch of the neutral curve are amplified *** analyzing the relationship between the amplification rate and the spanwise wavenumber of the 3-D disturbances at different evolution stages,the mechanism of the spanwise wavenumber selectivity of K-type 3-D disturbances in the presence of a finite amplitude 2-D disturbance is explained.

关键词： disturbance supersonic junction branch introducing selectivity compressible hydrodynamic explained infinity

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Nanofriction characteristics of h-BN with electric field induced electrostatic interaction

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Friction 2021年第6期9卷 1492-1503页

作者： Kemeng yu kun ZOU Haojie LANG Yitian PENG Shanghai Collaborative Innovation Center for High Performance Fiber Composites Donghua UniversityShanghai 201620China College of Mechanical Engineering Donghua UniversityShanghai 201620China Engineering Research Center of Advanced Textile Machinery Donghua UniversityShanghai 201620China

The nanofriction properties of hexagonal boron nitride(h-BN)are vital for its application as a substrate for graphene devices and solid lubricants in micro-and nano-electromechanical *** this work,the nanofriction characteristics of h-BN on Si/SiO_(2) substrates with a bias voltage are explored using a conductive atomic force microscopy(AFM)tip sliding on the h-BN surface under different substrate bias *** results show that the nanofriction on h-BN increases with an increase in the applied bias difference(V_(t–s))between the conductive tip and the *** nanofriction under negative V_(t–s) is larger than that under positive V_(t–s).The variation in nanofriction is relevant to the electrostatic interaction caused by the charging *** electrostatic force between opposite charges localized on the conductive tip and at the SiO2/Si interface increases with an increase in V_(t–s).Owing to the characteristics of p-type silicon,a positive V_(t–s) will first cause depletion of majority carriers,which results in a difference of nanofriction under positive and negative V_(t–s).Our findings provide an approach for manipulating the nanofriction of 2D insulating material surfaces through an applied electric field,and are helpful for designing a substrate for graphene devices.

关键词： nanofriction electrostatic interaction bias voltage h-BN atomic force microscopy

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Deposition of aerosol in a laminar pipe flow

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Science China(Technological Sciences) 2008年第8期51卷 1242-1254页

作者： luo XiaoWei yu Suyuan Institute of Nuclear Energy and New Energy Technology Tsinghua UniversityBeijing 100084China

In a laminar pipe flow, thermophoretic deposition occurs when the temperature of the pipe wall is less than the temperature of the fluid. For a horizontal pipe, gravity has a significant effect on the deposition of aerosol. Due to the laminar flow of gas fluid, a lift force is imposed on the particle and could affect the deposition of aerosol. In the present work, we considered the influences of various factors on the deposition of aerosol, including diffusion and convection, thermophoresis, gravi- tational settling and the lift force effect. The revised semi-implicit method for pressure-linked (SIMPLER) was employed to solve the aerosol transport equation. The deposition efficiency of aerosol in a pipe was obtained and the concentration distribution of aerosol at an arbitrary cross-section of pipe was given. The results reveal that when gravitational settling was considered the deposition efficiency had a minimum, corresponding to the penetration efficiency having a maximum. For large particles, the deposition of aerosol was dominated by external forces, and the critical particle trajectory method (CPTM) was used to analyze the deposition of aerosol with the action of thermophoretic force and gravity. The result from CPTM coincided very well with the result from SIMPLER.

关键词： aerosol thermophoresis gravitational settling deposition

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Accumulated Rotation of A Modified Suction Caisson and Soil Deformation Induced by Cyclic Loading

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China Ocean Engineering 2020年第3期34卷 441-449页

作者： BAI yun LI Da-yong ZHANG yu-kun Key Laboratory of Civil Engineering Disaster Prevention and Mitigation Shandong University of Science and TechnologyQingdao 266590China College of Civil Engineering Fuzhou UniversityFuzhouFujian 350108China

Modified suction caissons(MSCs)acting as offshore wind turbine foundations will generate the accumulated rotation under cyclic loading resulted from *** accumulated rotation and the range of soil deformation around the MSC under long-term cyclic wave loading were studied using 3-D numerical *** Morison equation was adopted to calculate the wave *** was found that the MSC accumulated rotation increases linearly with the increase of the logarithm of cyclic *** normalized expression was proposed to reflect the relationship between the accumulated rotation and cyclic *** soil deformation range around the MSC increases when increasing the cyclic number and loading *** can also be concluded that the accumulated rotation increases rapidly with this change of excess pore pressure in the first 4000 *** responses of the MSC to wave and wind loads were also *** show that the accumulated rotation of the MSC under both wave and wind loadings is larger than that under the wave loading only.

关键词： modified suction caisson(MSC) wave loading accumulated rotation soil deformation range

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凡纳对虾parkin共调基因和parkin在抗白斑综合征病毒中的表达分析和SNP开发

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渔业科学进展 2025年第1期46卷 194-209页

作者：薛倩李旭鹏李洋栾生罗坤孔杰邢群孟宪红浙江海洋大学水产学院浙江舟山316021 海水养殖生物育种与可持续产出全国重点实验室中国水产科学研究院黄海水产研究所山东青岛266071 青岛海洋科技中心海洋渔业科学与食物产出过程功能实验室山东青岛266237 邦普种业科技有限公司山东潍坊261311

本实验室前期研究中基于全基因组关联分析(GWAS)方法筛选到抗白斑综合征病毒(WSSV)候选基因:parkin共调基因(PACRG)。PACRG与帕金森病相关基因parkin共用一个双向启动子,二者共同参与细胞自噬过程,从而在细胞保护方面发挥作用。本研究... 详细信息

本实验室前期研究中基于全基因组关联分析(GWAS)方法筛选到抗白斑综合征病毒(WSSV)候选基因:parkin共调基因(PACRG)。PACRG与帕金森病相关基因parkin共用一个双向启动子,二者共同参与细胞自噬过程,从而在细胞保护方面发挥作用。本研究对凡纳对虾(Penaeus vannamei)PACRG和parkin在抗WSSV中的功能进行探讨,对其mRNA和氨基酸序列进行特征分析,利用real-timePCR技术检测对虾感染WSSV后不同时间、不同组织中PACRG和parkin的表达水平。通过荧光原位杂交技术(FISH)进行空间定位。利用PCR和Sanger测序技术获得单核苷酸多态性位点(SNP)并进行抗WSSV的关联分析。结果显示,PACRG开放阅读框(ORF)全长600bp,编码199个氨基酸,预测包含一个ParcG结构域。parkinORF序列全长1653bp,编码550个氨基酸,预测包含UBQ、IBR结构域和一个信号肽结构。与多物种进行同源序列比对发现,凡纳对虾PACRG氨基酸序列与日本对虾(Penaeus japonicus)的同源性高达89.70%;凡纳对虾parkin氨基酸序列与中国对虾(Penaeus chinensis)和斑节对虾(Penaeus monodon)的同源性高达93.45%。PACRG和parkin蛋白的保守性较高。感染WSSV后,PACRG和parkin在对虾肝胰腺、鳃、肌肉和眼柄中的表达水平发生显著变化,其中,眼柄中PACRG和parkin表现出极相似的组织表达模式。在肌肉中,PACRGmRNA和WSSV在空间位置上呈现高度重叠状态。结合上述结果,推测PACRG和parkin在凡纳对虾与WSSV的互作中发挥功能。在PACRG中筛选到2个SNP位点,在parkin中筛选到15个SNP位点,其中位于parkin非翻译区(UTR)的5个SNP位点与抗WSSV性状显著相关。本文为研究凡纳对虾抗WSSV的分子机制和抗病分子育种提供了理论依据和参考数据。

关键词：凡纳对虾白斑综合征病毒(WSSV) parkin共调基因(PACRG) parkin基因 SNP

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Novel Ag2S nanoparticles on reduced graphene oxide sheets as a super-efficient catalyst for the reduction of 4-nitrophenol

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Chinese Chemical Letters 2017年第2期28卷 417-421页

作者： Bin Lang Hong-kun yu College of Material Science and Engineering Fudan University Shanghai 200433 China

Here,Ag2S nanoparticles on reduced graphene oxide（Ag2S NPs/RGO） nanocomposites with relatively good distribution are synthesized for the first time by conversing Ag NPs/RGO to Ag2S NPs/RGO via a facile hydrothermal sulfurization *** an noval catalyst for the reduction of 4-nitrophenol（4-NP）,it only takes 5 min for Ag2S NPs/RGO to reduce 98% of 4-NP,and the rate constant of the composites is almost 13 times higher than that of Ag NPs/RGO *** high catalytic activity of Ag2S NPs/RGO can be attributed to the following three reasons：（1） Like metal complex catalysts,the Ag2S NPs is also rich with metal center Ag（δ^＋）,with pendant base S（δ） close to it,and thus the Ag and basic S function as the electron-acceptor and proton-acceptor centers,respectively,which facilitates the catalyst reaction;（2）RGO features the high adsorption ability toward 4-NP which provides a high concentration of 4-NP near the Ag2S NPs;and（3） electron transfer from RGO to Ag2S NPs,facilitating the uptake of electrons by 4-NP molecules.

关键词： Reduced graphene oxide Ag_2S nanoparticles Nanocomposites 4-Nitrophenol Catalytic activity

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