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Experimental and numerical investigations on wave motions over platform reef-flat

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Journal of Hydrodynamics 2022年第2期34卷 244-258页

作者： Hong-jun Zhao liu-jun Zong Cheng-ji Shen jun Kong Yu-liang Zhu jun-da Wang College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing210024China Hohai University Key Laboratory of Coastal Disasters and Defence Ministry of EducationNanjing210024China

Previous studies have shown that high-frequency(HF)waves,low-frequency(LF)waves and wave set-up coexist on shallow coral reef-flat and jointly contribute to potential floods and subsequent damages of infrastructures and islands on *** better understand the reef-flat wave dynamics with incident waves and still water level,a wave-flume experiment was performed based on an idealized platform reef composed of a steep reef-face(1:4),a relatively mild reef-rim(1:14)and a horizontal ***,the non-hydrostatic phase-resolving model SWASH was validated against the experiment and then applied to further numerically investigate the effects of reef-rim topographic features on the reef-flat wave *** results show that incident waves of a larger wave height and a longer wave period can generate larger LF waves and wave set-up,thereby inducing greater HF waves on the *** still water level can lead to larger HF waves but result in smaller wave *** contrast to HF waves and wave set-up,LF waves are minimally affected by the still water level.A rim of milder slope and larger edge depth will induce smaller HF and LF waves and set-up on the reef-flat,and thus provide better protection for the reef-flat ***,on the reef-flat,the ratio of HF significant wave height to water depth H_(s_h)/(h_(r)+η^(-))is approximately constant;the dimensionless LF significant wave height Hs_l/H_(s0) and the dimensionless wave set-upη^(-)/[T_(p)(gH_(s0))1/2]can be related to the inverse wave steepness parameter gT_(p)^(2)/H_(s0) and the relative reef-flat submergence(h_(r)+η^(-))/H_(s0) respectively.

关键词： High-frequency waves low-frequency waves wave set-up platform reef reef-rim topographic features

Interconnections between diabetic corneal neuropathy and diabetic retinopathy:diagnostic and therapeutic implications

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Neural Regeneration Research 2025年第8期20卷 2169-2180页

作者： Mingyi Yu Faith Teo En Ning Chang liu Yu-Chi liu Tissue Engineering and Stem Cell Group Singapore Eye Research InstituteSingapore Yong Loo Lin School of Medicine National University of SingaporeSingapore Department of Cornea and External Eye Disease Singapore National Eye CenterSingapore Ophthalmology and Visual Sciences Academic Clinical Program Duke-NUS Medical SchoolSingapore

Diabetic corneal neuropathy and diabetic retinopathy are ocular complications occurring in the context of diabetes *** corneal neuropathy refers to the progressive damage of corneal *** retinopathy has traditionally been considered as damage to the retinal ***,growing evidence suggests that diabetic retinopathy is a complex neurovascular disorder resulting from dysfunction of the neurovascular unit,which includes both the retinal vascular structures and neural *** retinopathy is one of the leading causes of blindness and is frequently screened for as part of diabetic ocular ***,diabetic corneal neuropathy is commonly overlooked and underdiagnosed,leading to severe ocular surface *** studies have found that these two conditions tend to occur together,and they share similarities in their pathogenesis pathways,being triggered by a status of chronic *** review aims to discuss the interconnection between diabetic corneal neuropathy and diabetic retinopathy,whether diabetic corneal neuropathy precedes diabetic retinopathy,as well as the relation between the stage of diabetic retinopathy and the severity of corneal *** also endeavor to explore the relevance of a corneal screening in diabetic eyes and the possibility of using corneal nerve measurements to monitor the progression of diabetic retinopathy.

关键词： cornea corneal nerves diabetes diabetic corneal neuropathy diabetic retinopathy retina

One-step electrochemical fabrication of bilayered MgO/polymer coating on magnesium alloy

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Frontiers of Materials Science 2014年第3期8卷 307-312页

作者： jun liang Ren-Hui ZHANG Zhen-jun PENG Bai-Xing liu State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China

This research demonstrates a novel one-step electrochemical method to fabricate thick bilayer coatings on magnesium alloy in acid phosphate electrolyte containing aniline monomer and styrene-acrylic emulsion （SAE） with pulsed DC voltage, The morphologies, XRD and FTIR results show that the bilayer coating consists of an inner oxide layer and an outer polyaniline （PANI）/SAE composite layer, It is believed that the bilayered structure achieved results from a hybrid process combining electropoly-merization （EPM） of aniiine, electrophoretic deposition （EPD） of SAE and plasma electrolyte oxidation （PEO） of magnesium alloy substrate. Electrochemical corrosion tests indicate that the bilayer coating can provide superior corrosion protection to the magnesium alloy substrate in 3.5 wt.% NaCl solution.

关键词： magnesium alloy bilayer coating EPD PEO corrosion resistance

Cathodic process of nickel electrodeposition from ammonia-ammonium chloride solutions

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Rare Metals 2023年第3期42卷 1061-1066页

作者： liang Yuan Zhi-Ying Ding Shi-jun liu Ya-Ning He School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

Mechanism of cathodic process on nickel electrodeposition from ammonia-ammonium chloride solutions was studied by Tafel polarization curves,linear sweep voltammetry(LSV),cyclic voltammograms(CV)and chronopotentiometry(CE)*** the electrolyte with 1.0 mol·L^(-1) NiCl_(2)·6H_(2)O,4.0 mol·L^(-1) NH_(3)·H_(2)O and2.5 mol·L^(-1) NH4Cl,nickel ion mainly complexed with ammonia and almost no free nickel ion could be *** is confirmed that the dominant form of nickel ammonia complex ion in the system is Ni(NH_(3))_(4)^(2+)by measuring the equilibrium potential of the electrode at various concentrations of *** species of Ni(NH_(3))42+turns into Ni(NH_(3))_(2)^(2+)during pre-chemical reaction step before discharging reduction ***,Ni(NH_(3))_(2)^(2+)discharges at the cathodic interface to form metal nickel deposit *** process is involved during nickel electrodeposition according to CV *** reduction reaction of Ni(NH_(3))_(2)^(2+)is irreversible which is controlled by diffusion *** processes are also accompanied during the electrodeposition process,except for the diffusioncontrolled process.

关键词： Electrodeposition Nickel Cathodic process Ammoniacal solution

Enhanced deposition of Zn O films by Li doping using radio frequency reactive magnetron sputtering

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International Journal of Minerals,Metallurgy and Materials 2015年第10期22卷 1108-1114页

作者： liang-xian Chen Sheng liu Cheng-ming Li Yi-chao Wang Jin-long liu jun-jun Wei Institute for Advanced Materials and Technology University of Science and Technology Beijing School of Electrical and Computer Engineering RMIT University

Radio frequency(RF) reactive magnetron sputtering was utilized to deposit Li-doped and undoped zinc oxide(Zn O) films on silicon wafers. Various Ar/O2 gas ratios by volume and sputtering powers were selected for each deposition process. The results demonstrate that the enhanced Zn O films are obtained via Li doping. The average deposition rate for doped Zn O films is twice more than that of the undoped films. Both atomic force microscopy and scanning electron microscopy studies indicate that Li doping significantly contributes to the higher degree of crystallinity of wurtzite–Zn O. X-ray diffraction analysis demonstrates that Li doping promotes the(002) preferential orientation in Li-doped Zn O films. However, an increase in the Zn O lattice constant, broadening of the(002) peak and a decrease in the peak integral area are observed in some Li-doped samples, especially as the form of Li2 O. This implies that doping with Li expands the crystal structure and thus induces the additional strain in the crystal lattice. The oriented-growth Li-doped Zn O will make significant applications in future surface acoustic wave devices.

关键词： zinc oxide thin films doping deposition magnetron

Multichannel radar adaptive signal detection in interference and structure nonhomogeneity

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Science China(Information Sciences) 2017年第11期60卷 221-234页

作者： Weijian liu Hui HAN jun liu Hongli LI Kai LI Yong-liang WANG Air Force Early Warning Academy State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System National Laboratory of Radar Signal Processing Xidian University Collaborative Innovation Center of Information Sensing and Understanding Xidian University School of Electronic Information Wuhan University

In this paper, we consider the problem of multichannel radar signal detection in interference and structure nonhomogeneity. The interference is often caused by electromagnetic countermeasure(ECM) systems or industrial activity, while the nonhomogeneity usually arises because of rapid variations in terrain or radar antenna structure. We propose three adaptive detectors according to three common criteria of detector design, namely, the generalized likelihood ratio test(GLRT), Rao test, and Wald test. Extensive performance comparisons are conducted under different scenarios. It is shown that when the nonhomogeneity is severe, the detector devised according to the GLRT achieves the best detection performance. In other scenarios, the detector designed according to the Wald test may be the best choice, which has the highest probability of detection.

关键词： adaptive detection generalized likelihood ratio test heterogeneity interference multichannel sig nal nonhomogeneity Rao test Wald test

Production of Polyamines Is Enhanced by Endogenous Abscisic Acid in Maize Seedlings Subjected to Salt Stress

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Journal of Integrative Plant Biology 2005年第11期47卷 1326-1334页

作者： jun liu Ming-Yi JIANG Yi-Feng ZHOU You-liang liu College of Life Sciences Nanjing Agricultural University Nanjing 210095 China

It is known that salt stress and exogenously applied abscisic acid （ABA） can enhance the polyamine content in plants and that salt stress itself can lead to an increase in endogenous ABA production. In the present study, the relationships between salt-induced ABA and polyamine accumulation were inves- tigated using ABA-deficient mutant （vp5/vp5） maize （Zea mays L.） seedlings and ABA and polyamine biosynthesis inhibitors. The results show that reduced endogenous ABA levels, as a result of either the mutation or by using a chemical inhibitor （sodium tungstate）, also reduced the accumulation of polyamines in salt-stressed leaves of maize seedlings. The polyamine synthesis inhibitors D-arginine and α- difluoromethylornithine also reduced the polyamine content of the leaves of maize seedling under salt stress. Both ABA and polyamine enhanced the dry weight accumulation of salt-stressed seedlings and also increased the activities of the two dominant tonoplast membrane enzymes, H^＋-ATPase and H^＋-PPase, when plants were under salt stress. The results suggest that salt stress induces an increase in endogenous ABA levels, which then enhances polyamine synthesis. Such responses may increase a plant＇s tolerance to salt.

关键词： abscisic acid maize (Zea mays) polyamine salt stress.

Ammonia pyrolysis oxidation excited by nanosecond pulsed discharge:Global/fluid models hybrid solution

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Journal of Energy Chemistry 2025年第1期100卷 385-396页

作者： Mingming Zhang Hanyu Wu Qi Chen Jiaxin Yang Bonan liu School of Mechanical Electronic and Control Engineering Beijing Jiaotong University China University of Petroleum

The kinetic characteristics of plasma-assisted oxidative pyrolysis of ammonia are studied by using the global/fluid models hybrid solution ***,the stable products of plasma-assisted oxidative pyrolysis of ammonia are *** results show that the consumption of NH3/O2and the production of N2/H2change linearly with the increase of voltage,which indicates the decoupling of nonequilibrium molecular excitation and oxidative pyrolysis of ammonia at low ***,the detailed reaction kinetics mechanism of ammonia oxidative pyrolysis stimulated by a nanosecond pulse voltage at low pressure and room temperature is *** on the reaction path analysis,the simplified mechanism is *** detailed and simplified mechanism simulation results are compared with experimental data to verify the accuracy of the simplified ***,based on the simplified mechanism,the fluid model of ammonia oxidative pyrolysis stimulated by the nanosecond pulse plasma is established to study the pre-sheath/sheath behavior and the resultant consumption and formation of key *** results show that the generation,development,and propagation of the pre-sheath have a great influence on the formation and consumption of *** consumption of NH3by the cathode pre-sheath is greater than that by the anode pre-sheath,but the opposite is true for OH and O（1S）.However,within the sheath,almost all reactions do not ***,by changing the parameters of nanosecond pulse power supply voltage,it is found that the electron number density,electron current density,and applied peak voltages are not the direct reasons for the structural changes of the sheath and ***,the discharge interval has little effect on the sheath structure and gas mixture *** research results of this paper not only help to understand the kinetic promotion of non-equilibrium excitation in the process of oxidative pyrolysis but also help to explore th

关键词： Nanosecond pulsed discharge Ammonia Oxidative pyrolysis Fluid model Global model

Effects of Free Heave Motion on Wave Forces on Two Side-by-Side Boxes in Close Proximity Under Wave Actions

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China Ocean Engineering 2021年第4期35卷 490-503页

作者： HE Zhi-wei GAO jun-liang ZANG jun CHEN Hong-zhou liu Qian WANG Gang School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Centre for Infrastructure Geotechnical and Water Engineering(IGWE)Department of Architecture and Civil EngineeringUniversity of BathBA27AYUK School of Civil Engineering and Architecture Northeast Electric Power UniversityJilin 132012China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China

Wave forces on two side-by-side boxes in close proximity under wave actions were analyzed using the OpenFOAM *** upstream box heaved freely under wave actions,whereas the downstream box remained *** comparison,a configuration in which both boxes were fixed was also *** effects of the heave motion of the upstream box on the wave loads,including the horizontal wave forces,vertical wave forces,and moments on the boxes,were the focus of this *** analyses showed that all frequencies at which the maximum horizontal wave forces,maximum vertical wave forces,and maximum moment appeared are dependent on the heave motion of the upstream box and that the effects of the heave motion on these frequencies are ***,these frequencies were observed to deviate from the corresponding fluid resonant ***,the heave motion of the upstream box reduced the wave forces acting on both boxes and altered the variation trends of the wave forces with the incident wave frequency.

关键词： fluid resonance wave forces narrow gap heave motion OpenFOAM