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NONLINEAR DYNAMICS OF A FGM PLATE WITH TWO CLAMPED OPPOSITE EDGES AND TWO FREE EDGES

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Acta Mechanica Solida Sinica 2014年第4期27卷 394-406页

作者： Y.X.Hao W.Zhang j.yang College of Mechanical Engineering Beijing Information Science and Technology University College of Mechanical Engineering Beijing University of Technology School of Aerospace Mechanical and Manufacturing Engineering RMIT University PO Box 71Bundoora VIC 3083 Australia

This paper deals with the nonlinear forced vibration of FGM rectangular plate with a boundary of two edges clamped opposite and the other two free. The plate is subjected to transversal and in-plane excitations. The present research treats the material properties of the FGM plates as temperature-dependent and graded continuously throughout the thickness direction, following the volume fraction of the constituent materials according to the power law. The temperature is assumed to be constant in the plane and varied only in the thickness direction of the plate. In the framework of geometrical nonlinearity the plate is modeled and the equations of motion are obtained on Hamilton＇s principle. With the help of Galerkin discretization, the nonlinear ordinary differential equations describing transverse vibration of the plate are proposed. By the numerical method, the nonlinear dynamical responses of the FGM plate with two clamped opposite and two free edges are analyzed.

关键词： functionally graded materials plate clamped bifurcation

The hills and valleys of calcium signaling

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Science China(Life Sciences) 2016年第8期59卷 743-748页

作者： Michael X.Zhu Biguang Tuo jenny j.yang Department of Integrative Biology and Pharmacology Mc Govern Medical School The University of Texas Health Science Center at Houston Department of Gastroenterology Affiliated Hospital Zunyi Medical College and Digestive Disease Institute of Guizhou Province Department of Chemistry Center for Diagnostics and Therapeutics Georgia State University

Calcium is important for life. Studies over the last several decades have gradually revealed the critical involvement of calcium, especially its ionic form （Ca2＋）, in every aspect of life forms on earth. Among them, a great deal of work has been done to illustrate how Ca2＋ levels are regulated in the cytoplasm and how many of the cytosolic enzymes and sig- naling molecules respond to the rise and fall of intracellular Ca2＋ concentrations （[Ca2＋]i）. Thanks to the men and wom- en who worked tirelessly for numerous hours in the labora- tory, who made meticulous efforts to invent powerful and innovative tools, and who thought extremely hard to solve the difficult puzzles on signaling pathways, we now know so much about this spectacular cellular functioning process,

关键词： Ca The hills and valleys of calcium signaling

NUMERICAL ANALYSIS OF HEAT TRANSFER DURING LASER CLADDING TO SYNTHESIZE TiCp/Al COMPOSITE

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Acta Metallurgica Sinica(English Letters) 2004年第1期17卷 1-6页

作者： D.N.Zou j.yang Y.L.Huang j.Y.Su School of Metallurgical Engineering Xi'an University of Architecture and Technology Xi'an 710055ChinaSchool of Metallurgical EngineeringXi'an University of Architecture and Technology Xi'an 710055ChinaSchool of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 ChinaSchool of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 China

Based on the continuum model for binary solid-liquid phase change system, the math-ematic model to simulate the process of laser cladding in situ synthesis TiCp/Al composite on the surface of aluminum alloy was formulated. The additive source method was employed to treat with the heat release of synthetic reaction in powder mixture at certain temperatures, and also to solve the momentum and heat transfer caused by the relative movement between laser beam and the specimen. Two different types of driving forces for flow were considered in the model, i.e., the buoyancy force and the surface tension gradient at the laser pool surface. The three-dimensional transient temperature field simulation program was developed being based upon the commercial software PHOENICS. The calculated and observed fusion boundaries were compared and very good agreement was obtained.

关键词： numerical simulation heat transfer laser cladding in situ synthesis composite

Rowing jellyfish contract to maintain neutral buoyancy

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Theoretical & Applied Mechanics Letters 2018年第3期8卷 147-152页

作者： Patricia j.yang Matthew Lemons David L.Hu Schools of Mechanical Engineering Georgia Institute of Technology Schools of Biology Georgia Institute of Technology

jellyfish are easily carried by ocean currents, yet most studies on jellyfish focus on the kinematicsin a quiescent fluid. In this experimental and theoretical study, we focus on rowing jellyfish, thosethat partially contract their bells and paddle in a relaxed manner. We film six species of rowingjellyfish in a range of background flow speeds at the Georgia Aquarium. Each species has a uniquecontraction frequency, which is independent of both the body orientation and the backgroundflow speed. Our mathematical model reveals that jellyfish contract to offset their sinking. Thisbehavior is invariant： Despite the background flow conditions, jellyfish contract as if they areoriented upright in a quiescent fluid. Our study suggests that jellyfish operate in open-loop withoutfeedback from their environment.

关键词： jellyfish Thrust Background flow

Modeling biomembranes and red blood cells by coarse-grained particle methods

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Applied Mathematics and Mechanics(English Edition) 2018年第1期39卷 3-20页

作者： H.LI H.Y.CHANG j.yang L.LU Y.H.TANG G.LYKOTRAFITIS Division of Applied Mathematics Brown University Department of Materials Science and Engineering Massachusetts Institute of Technology Department of Mechanical Engineering University of Connecticut

In this work, the previously developed coarse-grained （CG） particle models for biomembranes and red blood cells （RBCs） are reviewed, and the advantages of the CG particle methods over the continuum and atomistic simulations for modeling biological phenomena are discussed. CG particle models can largely increase the length scale and time scale of atomistic simulations by eliminating the fast degrees of freedom while preserving the mesoscopic structures and properties of the simulated system. Moreover, CG particle models can be used to capture the microstructural alternations in diseased RBCs and simulate the topological changes of biomembranes and RBCs, which are the major challenges to the typical continuum representations of membranes and RBCs. The power and versatility of CG particle methods are demonstrated：through simulating the dynamical processes mvolving significant topological .changes e.g. lipid self-assembly vesicle fusion and membrane budding.

关键词： coarse-grained molecular dynamics,lipid bilayer red blood cell membrane membrane fusion

CRYSTAL STRUCTURE AND MORPHOLOGY OF NASCENT SAMPLES OF SYMMETRIC AROMATIC POLYESTERS——Ⅱ. POLY(p-PHENYLENE 2,6-NAPHTHALATE)

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Chinese journal of Polymer Science 2003年第2期21卷 205-221页

作者： j.yang j.Wang G.Sidoti j.Liu F.Rybnikar M.Kaszonyiova P.H.Geil DepartmentofMaterialsScienceandEngineering UniversityofIllinoisUrbanaIL6180 TomasBataUniversityofZlin ZlinCzechRepublic

Confined thin film melt polymerization (CTFMP) of naphthalene chloride/hydroquinone (NCMQ, 1/1, molar)mixtures at polymerization temperatures (T_p) below ca. 300℃ resulted in relatively thick, elongated crystals. Polymerizationof NC/HQ above 300℃ between glass yielded well-formed lamellar crystals ca. 100 A thick. Phase Ⅰ and Ⅱ [001] EDpatterns were obtained for all T_p, the relative amount of phase Ⅰ increasing with T_p. Polymerization of naphthalenedicarboxylic acid/hydroquinione diacetate 1/1 mixtures at high T_p also yielded lamellar crystals that "curled up" off of thesubstrate. When the high temperature CTFMP polymerization was conducted between mica, aggregates of lamellae on-edgedeveloped but epitaxial growth did not occur. Epitaxial growth of lamellae between mica could be obtained, however, byconfined thin film solution polymerization, with both of the latter samples yielding apparently related ED patterns from adifferent unit cell than phase Ⅰ or Ⅱ. Fiber patterns, obtained from sheared samples, indicated considerably greater crystaldisorder than in the nascent crystals. Refinement of the phase Ⅰ unit cell parameters, based on the [001] and [01 1] EDpatterns, with modeling based on Cerius^2, suggests a monoclinic phase Ⅰ unit cell with a = 7.76, b = 5.71, c = 14.99 A, α = γ= 90°, β= 99.7°, ρ = 1.47 g/cm^3, space group P12_1/al.

关键词： Poly(p-phenylene 2,6-naphthalate Crystal structure Morphology Confined thin film melt polymerization

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Effect of polypropylene fiber on physical and mechanical properties of cement mortars containing composite pozzolan

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Effect of polypropylene fiber on physical and mechanical pro...

Nonlinear aero-thermoelastic vibration of FGM cylindrical panel in supersonic flow

TEIM2015第六届无机材料结构、性能及测试表征技术研讨会

作者： E.Mohseni j.yang Department of Civil Engineering University of Guilan 上海交通大学

This paper focuses on the effect of three supplementary cementitious materials in mortar:rice husk ash(RHA),nano-alumina(NA)and polypropylene fiber(PPF).RHA is an agricultural waste material and recycling of this material has substantial economic and environmental *** hardened properties were examinedfor the compressive strength,the flexural strength and the water *** addition,in order to study the micro structures and interfacial transition zone,the Scanning Electron Microscope(SEM)and X-ray Diffraction analysis(XRD)were used *** test results revealed a slight increase in compressive strength by substituting RHA in mortar up to 10wt%.However the addition of 2%nanoparticies helped the compressive strength of mortar remain approximately equal to the control specimen even when 20 or 30wt%RHA was *** results also indicated the outstanding effect of adding PPF on the improvement of the flexural strength,as the mixes containing PPF and RHA registered higher values in comparison with the controal *** was also observed that NA and PPF could reduce water absorption by pore blocking *** analysis illustrated that by the addition of NA,the intensity of Alite and Belite phase decreased and the new peak of portlandite was ***,a combination of suitable amounts of RHA,NA and PPF would be a good way to produce durable concrete with suitable mechanical properties.

关键词： Effect of polypropylene fiber on physical and mechanical properties of cement mortars containing composite pozzolan

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Nonlinear aero-thermoelastic vibration of FGM cylindrical pa...

Molecular regulation of calcium-sensing receptor(CaSR)-mediated signaling

第三届海峡两岸动力学、振动与控制学术会议

作者：郝育新 W.Zhang j.yang 北京信息科技大学机电学院 College of Mechanical Engineering Beijing University of Technology School of Aerospace Mechanical and Manufacturing Engineering RMIT University

Functionally graded materials (FGM) shell structures which are made from ceramic and metal are often found used in aeronautical and aerospace constructions, for example they are used as heat shield in aircraft engines. It is because by gradually varying the volume fraction, the material properties of functionally graded materials show a continuous change from one surface to another. This can mitigate

关键词： Functionally graded materials Cylindrical panel aero-thermoelastic flutter

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Chronic Diseases and Translational Medicine 2024年第3期10卷 167-194页

作者： Li Tian Corey Andrews Qiuyun Yan jenny j.yang Department of Chemistry Center for Diagnostics and TherapeuticsAdvanced Translational Imaging FacilityGeorgia State UniversityAtlantaGeorgiaUSA

Calcium-sensing receptor(CaSR),a family C G-protein-coupled receptor,plays a crucial role in regulating calcium homeostasis by sensing small concentration changes of extracellular Ca^(2+),Mg^(2+),amino acids(e.g.,L-Trp and L-Phe),small peptides,anions(e.g.,HCO_(3)^(-)and PO_(4)^(3-)),and ***-mediated intracellular Ca^(2+)signaling regulates a diverse set of cellular processes including gene transcription,cell proliferation,differentiation,apoptosis,muscle contraction,and neuronal *** of CaSR with mutations results in diseases such as autosomal dominant hypocalcemia,familial hypocalciuric hypercalcemia,and neonatal severe *** also influences calciotropic disorders,such as osteoporosis,and noncalciotropic disorders,such as cancer,Alzheimer's disease,and pulmonary arterial *** study first reviews recent advances in biochemical and structural determination of the framework of CaSR and its interaction sites with natural ligands,as well as exogenous positive allosteric modulators and negative allosteric *** establishment of the first CaSR protein-protein interactome network revealed 94 novel players involved in protein processing in endoplasmic reticulum,trafficking,cell surface expression,endocytosis,degradation,and signaling *** roles of these proteins in Ca^(2+)-dependent cellular physiological processes and in CaSR-dependent cellular signaling provide new insights into the molecular basis of diseases caused by CaSR mutations and dysregulated CaSR activity caused by its protein interactors and facilitate the design of therapeutic agents that target CaSR and other family C G-protein-coupled receptors.

关键词： calcium signaling calcium-sensing receptor G-protein-coupled receptors structure trafficking