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New Subclasses of Biholomorphic Mappings and the Modified Roper-Suffridge Operator

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Chinese Annals of Mathematics,Series B 2016年第5期37卷 691-704页

作者： Chaojun WANG Yanyan CUI hao liu College of Mathematics and Statistics Zhoukou Normal UniversityZhoukou 466001HenanChina Institute of Contemporary Mathematics Henan UniversityKaifeng 475001HenanChina.

The authors propose a new approach to construct subclasses of biholomorphic mappings with special geometric properties in several complex variables. The RoperSuffridge operator on the unit ball B^n in C^n is modified. By the analytical characteristics and the growth theorems of subclasses of spirallike mappings, it is proved that the modified Roper-Suffridge operator [Φ_(G,γ)(f)](z) preserves the properties of S_Ω~*(A, B), as well as strong and almost spirallikeness of type β and order α on B^n. Thus, the mappings in S_Ω~*(A, B), as well as strong and almost spirallike mappings, can be constructed through the corresponding functions in one complex variable. The conclusions follow some special cases and contain the elementary results.

关键词： Operator normalized elementary symmetric Modified conclusions powerful dimensions constructing polynomial

A New Direct Search Method Based on Separable Fractional Interpolation Model

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Acta Mathematicae Applicatae Sinica 2016年第2期32卷 257-268页

作者： QIN NI CUI JIANG hao liu College of Sciences Nanjing University of Aeronautics and Astronautics College of Sciences Nanjing University of Technology

In this paper, we propose a new separable fractional interpolation model which can be established by 2n interpolation points where n is the number of variables. Based on this model, a new direct search method is presented. In this method, a new iterate is determined by solving the fractional interpolation model in trust region. Under mild assumptions, the convergence results of this method are given and proved, Numerical experiments show that the new method is promising.

关键词： direct search method fractional interpolation model trust region

Effect of Interfacial Strength on Bending Properties of Reinforced Concrete Beams

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Journal of Wuhan University of Technology(Materials Science) 2013年第6期28卷 1161-1166页

作者： ZHANG Yafang YANG Wenlong liu hao Faculty of Civil Engineering Guangzhou University

By taking into consideration of meso-scopic level, four-point bending numerical model of different interfaces was established to analyze the effect of interracial strength on the bending properties of reinforced concrete beams with the diagrams of crack pattern, the load- step curve and the cumulative AE- loading step curve. The experimental result shows that the peak load, the cracking load and the stiffness before cracking increase with the interfacial strength. Furthermore, the specimen with strong interface presents high brittleness during the failure process, while both bearing capability and ductility could be found in the specimen with moderate interfacial strength.

关键词： reinforced concrete interfacial strength peak load acoustic emission

ALTERNATELY LINEARIZED IMPLICIT ITERATION METHODS FOR SOLVING QUADRATIC MATRIX EQUATIONS

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Journal of Computational Mathematics 2014年第3期32卷 306-311页

作者： Bing Gui hao liu Minli Yan School of Science Nanjing Forestry University Nanjing 210037 China College of Science Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

A numerical solution of the quadratic matrix equations associated with a nonsingular M-matrix by using the alternately linearized implicit iteration method is considered. An iteration method for computing a nonsingular M-matrix solution of the quadratic matrix equations is developed, and its corresponding theory is given. Some numerical examples are provided to show the efficiency of the new method.

关键词： Quadratic matrix equation Alternately iteration M-matrix Matrix transformation.

On efficient key tag writing in RFID-enabled IoT

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Science China(Information Sciences) 2021年第6期64卷 252-254页

作者： Pengfei ZHANG hao liu Jihong YU School of Information and Electronics Beijing Institute of Technology

Dear editor,Radio-frequency identification(RFID) can provide data in an energy-efficient and low-cost way for data-driven intelligent decisions in emerging Industrial IoT [1]. In RFID systems, tags store information of physical objects and can be attached to these objects [2–5]. Tags can capture energy in the RF signal of a nearby RFID reader for data transmission [6].

关键词： tag On efficient key tag writing in RFID-enabled IoT

Shear behaviour of anchored jointed rock mass under different engineering conditions considering damage and joint surface morphology

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Underground Space 2023年第6期13卷 316-334页

作者： Zenghui Zhao Wei Sun Shaojie Chen hao liu College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China Department of Petroleum Engineering China University of Petroleum-BeijingBeijing 102249China

According to different geological conditions and engineering disturbance,three dimensional numerical models of anchored jointed rock mass with two kinds of boundary conditions of constant normal load(CNL)and constant normal stiffness(CNS)were constructed considering the ductility damage of rockbolt,the stiffness degradation of grouting layer and the joint surface *** effects of anchorage angle,joint surface morphology,and boundary conditions on the shear performance of anchorage system were analyzed,and the failure characteristics under different working conditions were ***,the analytical solution of shear strength of anchored system was *** show that the larger the anchorage angle is,the more serious the necking phenomenon of rockbolt will *** damage degree of the bonding layer and the horizontal displacement of the bedding rock mass decrease with the increase of the joint surface *** CNL condition is to instantaneously apply high normal stress,and the CNS condition is to gradually form a high normal stress environment through the superposition of increment on the basis of the initial value,which can resist greater transverse *** is equivalent to enhancing the ductility of the *** shear strength of the system increases with the increase of normal stress and normal *** the normal stiffness will underestimate the shear strength.

关键词： Anchored jointed rock mass Normal stress Normal stiffness Progressive damage

A simulation-based study on longitudinal gust response of flexible flapping wings

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Acta Mechanica Sinica 2018年第6期34卷 1048-1060页

作者： Toshiyuki Nakata Ryusuke Noda Shinobu Kumagai hao liu Graduate School of Engineering Chiba UniversityChiba 263-8522Japan Department of Mechanical Engineering Kanto Gakuin UniversityKanagawa 263-8501Japan

Winged animals such as insects are capable of flying and surviving in an unsteady and unpredictable aerial *** generate and control aerodynamic forces by flapping their flexible *** the dynamic shape changes of their flapping wings are known to enhance the efficiency of their flight,they can also affect the stability of a flapping wing flyer under unpredictable disturbances by responding to the sudden changes of aerodynamic forces on the *** order to test the hypothesis,the gust response of flexible flapping wings is investigated numerically with a specific focus on the passive maintenance of aerodynamic forces by the wing *** computational model is based on a dynamic flight simulator that can incorporate the realistic morphology,the kinematics,the structural dynamics,the aerodynamics and the fluid-structure interactions of a hovering *** longitudinal gusts are imposed against the tethered model of a hovering hawkmoth with flexible flapping *** is found that the aerodynamic forces on the flapping wings are affected by the gust,because of the increase or decrease in relative wingtip velocity or kinematic angle of *** passive shape change of flexible wings can,however,reduce the changes in the magnitude and direction of aerodynamic forces by the gusts from various directions,except for the downward *** adaptive response of the flexible structure to stabilise the attitude can be classified into the mechanical feedback,which works passively with minimal delay,and is of great importance to the design of bio-inspired flapping wings for micro-air vehicles.

关键词： Insect flight Flapping wing Flexible wing Gust response Fluid-structure interaction Mechanical feedback

Unsteady bio-fluid dynamics in flying and swimming

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Acta Mechanica Sinica 2017年第4期33卷 663-684页

作者： hao liu Dmitry Kolomenskiy Toshiyuki Nakata Gen Li Graduate School of Engineering Chiba University 1-33Yayoi-cho Inage-ku Chiba Japan Shanghai-Jiao Tong University and Chiba UniversityInternational Cooperative Research Centre (SJTU-CU ICRC) Shanghai 200240 China

Flying and swimming in nature present sophisticated and exciting ventures in biomimetics, which seeks sustainable solutions and solves practical problems by emulating nature＇s time-tested patterns, functions, and strategies. Bio-fluids in insect and bird flight, as well as in fish swimming are highly dynamic and unsteady; however, they have been studied mostly with a focus on the phenomena associated with a body or wings moving in a steady flow. Characterized by unsteady wing flapping and body undulation, fluid-structure interactions, flexible wings and bodies, turbulent environments, and complex maneuver, bio-fluid dynamics normally have challenges associated with low Reynolds number regime and high unsteadiness in modeling and analysis of flow physics. In this article, we review and highlight recent advances in unsteady bio-fluid dynamics in terms of leading-edge vortices, passive mechanisms in flexible wings and hinges, flapping flight in unsteady environments, and micro-structured aerodynamics in flapping flight, as well as undulatory swimming, flapping-fin hydrodynamics, body–fin interac-tion, C-start and maneuvering, swimming in turbulence,collective swimming, and micro-structured hydrodynamics in swimming. We further give a perspective outlook on future challenges and tasks of several key issues of the field.

关键词： swimming wings unsteady turbulence hydrodynamics turbulent body kinematics vortex street

Magnetic and thermosensitive luminescent nanocomposites based on Fe_3O_4/SiO_2/poly(N-isopropylacrylamide)/lanthanidepolyoxometalates and their controllable luminescence properties

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Journal of Rare Earths 2018年第7期36卷 733-738页

作者： Jun Wang Si Chen hao liu Wuke Li College of Chemistry Central China Normal University

Magnetic and temperature-responsive luminescent composites based on poly（N-isopropylacrylamide）,magnetic nanoparticles and Na9[EuW10O36] were fabricated. The composites were investigated by IR, UV,XRD, TGA, SEM and TEM. The prepared nanocomposites exhibit good superparamagnetic property and thermo-responsive switchable luminescence properties. The multifunctional nanocomposites can be separated by external magnetic field. Moreover, the nanocomposites exhibit an appreciable temperature response, and the red luminescence of the nanocomposites in solution can be controlled by the temperature stimuli. The hydrogel emits strong redluminescence in solution at 25 ℃,which can be seen by naked eyes. When the external temperature is 40 ℃, the red luminescence almost disappears in *** is expected that the multifunctional nanoparticles have potential applications in the field of biomedicine.

关键词： Magnetic Lanthanide Luminescence Thermosensitive Controllable Rare carths