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Capillary-gravity ship wave patterns

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Journal of Hydrodynamics 2017年第5期29卷 825-830页

作者： hui liang Xiaobo Chen Deepwater Technology Research Centre(DTRC) Bureau VeritasSingapore College of Shipbuilding Engineering Harbin Engineering UniversityHarbin 150001China

Ship wave pattern is a fascinating research topic in the fields of marine hydrodynamics and water waves. Within the pure-gravity wave theory, the ship wave pattern composed of transverse waves and divergent waves appearing on the downstream is confined within a sector symmetrical about the ship track with a half-angle 19°28＇. However, when the surface tension is accounted for, the wave pattern is greatly modified especially at a low translating speed. Besides the minimum speed of capillary waves c_（min）= 0.23 m/s below which waves cannot be generated, there is another critical speed c_（div）= 0.45 m/s associated with the disappearance of divergent waves. In the present paper, the wave patterns created by a steadily translating source are studied, and they are examined with the crestlines obtained from the asymptotic analysis.

关键词： Ship waves wave pattern gravity-dominant waves capillarity-dominant waves

Wavy properties and analytical modeling of free-surface flows in the development of the multi-domain method

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Journal of Hydrodynamics 2016年第6期28卷 971-976页

作者： Xiaobo CHEN hui liang Deepwater Technology Research Centre Bureau Veritas

The wavy （oscillatory both in space and in time） properties of free-surface flows due to presence of floating bodies are analyzed within the framework of the potential-flow theory by assuming that the fluid is perfect and flow irrotational. A so-called new multi-domain method has been developed based on the fluid domain division by an analytical control surface surrounding bodies and the application of different methods adapted in the external and internal domains. In the analytical domain external to the control surface, the fundamental solution satisfying the linear boundary condition on the free surface associated with a point singularity （often called Green fimction and referred here as point solution） is applied to capture all wavy features of free-surface flows extending horizontally to infinity. Unlike classical studies in which the control surface is discretized, the unknown velocity potential and its normal derivatives are expressed by expansions of orthogonal elementary functions. The velocity potential associa- ted with each elementary distribution （elementary solutions） on the control surface can be obtained by performing multi-fold inte- grals in an analytical way. In the domain internal to the control surface containing the bodies, we could apply different methods like the Rankine source method based on the boundary integral equations for which the elementary solutions obtained in the external domain playing the role of Dirichlet-to-Neumarm operator close the problem.

关键词： analytical modeling multi-domain method point solution (PS) elementary solution (ES) body solution (BS)

SUPERCONVERGENCE ANALYSIS OF A NONCONFORMING TRIANGULAR ELEMENT ON ANISOTROPIC MESHES

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Journal of Systems Science & Complexity 2007年第4期20卷 536-544页

作者： Dongyang SHI hui liang Caixia WANG Department of Mathematics Zhengzhou University Zhengzhou 450052 China Department of Mathematics Harbin Institute of Technology Harbin 150001 China

The class of anisotropic meshes we conceived abandons the regular assumption. Some distinct properties of Carey＇s element are used to deal with the superconvergence for a class of two- dimensional second-order elliptic boundary value problems on anisotropic meshes. The optimal results are obtained and numerical examples are given to confirm our theoretical analysis.

关键词： Anisotropic meshes Carey's element Nonconforming superclose superconvergence.

Multiple roles of PTEN isoforms PTENα and PTENβ in cellular activities and tumor development

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Science China(Life Sciences) 2019年第12期62卷 1722-1724页

作者： hui liang Yuxin Yin Institute of Systems Biomedicine Department of Pathology School of Basic Medical Sciences Peking-Tsinghua Center for Life SciencesPeking University Health Science Center

PTEN is a powerful tumor suppressor gene frequently mutated in human cancers and autism spectrum *** protein is located both in the cytoplasm and nucleus and can also be secreted from *** best characterized function of PTEN is its ability to dephosphorylate Ptdlns(3,4,5)P3 and converts it back into PIP2 in the cytoplasm,therefore antagonizing the PI3K/AKT pathway which is mainly involved in regulation of cell growth,differentiation,proliferation and invasion(Hopkins et al.,2014;Lee et al.,2018).It has been demonstrated that the nuclear PTEN mainly participates in the maintenance of chromosome stability and regulation of DNA repair pathway(Shen et al.,2007).More recently,nuclear PTEN is also shown to interact with the splicing machinery,spliceosome,to regulate its assembly and pre-mRNA splicing(Shen et al.,2018).In human genome,there is only one gene that encodes ***,more and more lines of evidence indicate that the PTEN gene may translate isoforms that function differently from canonical PTEN protein.

关键词： PI3K/AKT Hopkins PTEN

Simulation of Interference Nanolithography of Second-Exciting Surface-Plasmon Polartions for Metal Nanograting Fabrication

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Chinese Physics Letters 2011年第1期28卷 205-207页

作者： liang hui-Min WANG Jing-Quan College of Science Hebei University of Engineering Handan 056038 Department of Physics Sichuan University Chengdu 610064

Second-exciting surface-polasmon-polariton （SPP） interference lithography （SE-SPPIL） designed by an improving attenuated total reflection （ATR） mode is suggested for fabricating metal nanograting. A metal film coated under a prism excites SPP first, and then the SPP energy transmits into another metal film and launches SPP again. An interlayer between two metal films is a thin resist coated on the second metal film. An interference nanopattern is formed in the resist when two SPP waves are launched symmetrically. After development, chemical or physical etching, the nanopattern is transferred into the metal film. A random thickness metal grating can be achieved as the thickness of the second metal film does not influence the interference pattern intensity. This scheme is promising for fabricating metal nanograting at low cost.

关键词： Condensed matter: electrical, magnetic and optical Optics, quantum optics and lasers Nanoscale science and low-D systems

Finite-Time Stability and Instability of Nonlinear Impulsive Systems

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Advances in Applied Mathematics and Mechanics 2023年第1期15卷 49-68页

作者： Guihua Zhao hui liang College of Science University of Shanghai for Science and TechnologyShanghai200093China School of Science Harbin Institute of TechnologyShenzhenGuangdong 518055China

In this paper,the finite-time stability and instability are studied for nonlinear impulsive *** are mainly four concerns.1)For the system with stabilizing impulses,a Lyapunov theorem on global finite-time stability is presented.2)When the system without impulsive effects is globally finite-time stable(GFTS)and the settling time is continuous at the origin,it is proved that it is still GFTS over any class of impulse sequences,if the mixed impulsive jumps satisfy some mild conditions.3)For systems with destabilizing impulses,it is shown that to be finite-time stable,the destabilizing impulses should not occur too frequently,otherwise,the origin of the impulsive system is finite-time instable,which are formulated by average dwell time(ADT)conditions respectively.4)A theorem on finite-time instability is provided for system with stabilizing *** each GFTS theorem of impulsive systems considered in this paper,the upper boundedness of settling time is given,which depends on the initial value and impulsive *** numerical examples are given to illustrate the theoretical analysis.

关键词： Impulsive systems finite-time stability finite-time instability nonlinear systems

A Survey and Taxonomy of Resource Allocation Methods in Wireless Networks

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Journal of Communications and Information Networks 2021年第4期6卷 372-384页

作者： hui liang Wei Zhang School of Electrical Engineering and Intelligentization Dong-guan University of TechnologyDongguan 523808China Peng Cheng Laboratory Shenzhen 518055China School of Electrical Engineering and Telecommunications the University of New South WalesSydneyNSW 2052Australia

Resource allocation is a fundamental and vital issue for arbitrary wireless networks,which can guarantee the network to run efficiently and ***,in the 5G and future 6G networks,numerous distinct wireless network service demands will be requested from various vertical *** to select the most suitable one from these countless methods accurately and efficiently is still a far unsolved *** this survey,we give a comprehensive review of the domain of resource allocation in wireless *** survey begins with an overview of the resource allocation problem in present wireless networks and related works about the review of resource allocation *** then give a novel unified framework by using a six-tuple model for existing resource allocation methods of wireless *** to this model,we categorize these methods into two main classifications,namely single decision maker and multiple decision maker resource *** discussion and representative research results about the above taxonomy are subsequently ***,the conclusion and some promising research opportunities are presented at the end of the survey paper.

关键词： resource allocation optimization theory game theory wireless networks

Spur Gear Tooth Pitting Propagation Assessment Using Model-based Analysis

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Chinese Journal of Mechanical Engineering 2017年第6期30卷 1369-1382页

作者： Xi-hui liang Zhi-liang Liu Jun Pan Ming Jian Zuo Department of Mechanical Engineering University of Alberta School of Mechatronics Engineering University of Electronic Science and Technology Key Laboratory of Reliability Technology for Mechanical and Electrical Product of Zhejiang Province Zhejiang Sci-Tech University

Tooth pitting is a common failure mode of a gearbox. Many researchers investigated dynamic properties of a gearbox with localized pitting damage on a single gear tooth. The dynamic properties of a gearbox with pitting distributed over multiple teeth have rarely been investi- gated. In this paper, gear tooth pitting propagation to neighboring teeth is modeled and investigated for a pair of spur gears. Tooth pitting propagation effect on time-vary- ing mesh stiffness, gearbox dynamics and vibration char- acteristics is studied and then fault symptoms are revealed. In addition, the influence of gear mesh damping and environmental noise on gearbox vibration properties is investigated. In the end, 114 statistical features are tested to estimate tooth pitting growth. Statistical features that are insensitive to gear mesh damping and environmental noise are recommended.

关键词： Mesh stiffness Mesh damping Geardynamics Vibration Statistical feature Dynamicsimulation

Anomalous microstructure and tribological evaluation of AlCrFeNiW_(0.2)Ti_(0.5)high-entropy alloy coating manufactured by laser cladding in seawater

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Journal of Materials Science & Technology 2021年第26期85卷 224-234页

作者： hui liang Dongxu Qiao Junwei Miao Zhiqiang Cao hui Jiang Tongmin Wang Materials Science and Engineering Dalian University of TechnologyDalian116024China New Materials Innovation Center Ningbo Institute of Dalian University of TechnologyNingbo315000China College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao266590China

To evaluate the potential of high entropy alloys for marine applications,a new high entropy alloy coating of AlCrFeNiW_(0.2)Ti_(0.5)was designed and produced on Q235 steel via laser *** microstructure,microhardness and tribological performances sliding against YG6 cemented carbide,GCr15 steel and Si_(3)N_(4)ceramic in seawater were studied in *** AlCrFeNiW_(0.2)Ti_(0.5)coating showed an anomalous’sunflower-like’morphology and consisted of BCC and ordered B2 *** microhardness was approximately 692.5 HV,which was 5 times higher than *** coating showed more excellent tribological performances than Q235 steel and SUS304,a typical material used in seawater environment,sliding against all three coupled balls in ***,the wear and friction of AlCrFeNiW_(0.2)Ti_(0.5)coating sliding against YG6 in seawater were most *** main reason was the generation of Mg(OH)_(2),CaCO_(3),metal oxides and hydroxides and the formation of protective tribo-film on the worn surface of AlCrFeNiW_(0.2)Ti_(0.5)coating in the process of reciprocated *** would effectively hinder the direct contact between the worn surfaces of AlCrFeNiW_(0.2)Ti_(0.5)coating and YG6 ball,resulting in a decrease of friction coefficient and wear *** the YG6 was an ideal coupled material for AlCrFeNiW_(0.2)Ti_(0.5)coating in seawater,and the coating would become a promising wear-resisting material in ocean environment.

关键词： High-entropy alloy coating Laser cladding Microstructure Microhardness Tribological properties