Leakage of an eagle flight feather and its influence on the aerodynamics

We investigate how the barb of bird feathers is changed along both the rachis and barb.To investigate the microstructures and the mechanical behaviors of barbs,a series of barbs are manually cut from an eagle’s primary feather to observe the cross sections.Aλ-like cross section with a tiny hook is observed at the right feet at each section.Afterwards,a measurement of the setup system is developed to evaluate the leakage ratio of a feather followed by a numerical predicting approach based on the CFD method.It is found that the air leakage increases linearly against the pressure,and the predicted results coincide well with the experimental results.Finally,the influences of leakage of the flight feather on both steady and unsteady aerodynamics are studied.     

一类艾滋病传播的数学模型的定态非负解

利用分歧理论讨论带扩散问题艾滋病传播数学模型定态非负解及全局性质．     

Brusselator方程解的存在性和稳定性

本文研究了一种Brusselator方程的。用不变区域证明了解的全局存在性，并通过构造上下解给出了非常数定态解渐进稳定的条件。最后推出吸引域。     

COUPLED FIXED POINTS OF SKEW INCREASING OPERATORS AND APPLICATIONS

1Intr0ducti0nIllthisPaPerwestudythefordpointsandcouPledfiXedpointsofskewincreasing0PeratorsandtheiraPplicaion.LetXbeaBanachsPaCcwithapartialorderingintr0ducedbythcc0neK-LctF:X-Xbean0peraorinX.FiscaJledinCreasingifF2SFgf0raJl2Sy.Asiswellkllown,inthetheorerns0fhapointforincreasingoPerbo,thereisaninterestinginterreboi0nbetweenPr0pertiesofKandF,thatisThoorem1l1I'I2ILetXbeaBanachpee,partiaJlyorderedbythecolleKGX.Let[a,b]beanordeintervalandF:[a,b]- [a,b]increasin.ThenFhasabop0intif0…     

关于一个定理的改进

本文利用归纳法和调和函数的平均值公式，并通过寻求函数的最大值，把调和函数k阶偏导数的局部估计式的系数由Ck=（2^n＋1 nk）^k/a（n）缩小到Ck=（n＋k）^n＋k＇/a（b）b^n-k。     

实H空间对称线性单调算子固有值问题及应用

本文在实Ｈｉｌｂｅｒｔ空间中讨论了带权算子的对称线性单调算子的固有值问题，得出了最小正固有值及其相应的固有向量的一些相关结论，并给出了它们在某些边值、初边值问题等方面的应用     

碱土金属氧化物对硼熔块釉的影响分析

针对碱土金属氧化物对陶瓷釉面质量影响显著、复杂的实际问题,以硼熔块釉为基础配方,适量氧化铜和氧化铁为离子着色剂,系统研究了钙、镁、钡、锌、锶碱土金属氧化物(RO)对釉面质量的影响.研究结果表明:(1)不同RO组成及比例的硼熔块釉效果差异显著,制备的复合碱土熔块釉较单一碱土能显著提高釉面质量、扩大发色范围及产生分相乳浊现象;(2)Ca碱土的加入有促使Na2 O-K2 O-CaO-RO-SiO2-B2 O3-Al2 O3系硼熔块釉产生较强釉面乳浊的特点,且使釉面颜色变淡变浅;(3)1180℃烧成温度下,当釉中RO为12;方解石和12;BaCO3,或者12;ZnO和12;SrCO3,同时添加3;氧化铜和1;氧化铁时,易使硼熔块釉呈现局部深蓝、附带流纹的花釉效果.     

一类带有反应项的趋化性方程组解的存在唯一性

本文研究了主方程中带有反应项的Keller-Segel趋化性模型.利用截断函数、半群算子和不动点定理,获得了范数估计以及模型局部解的存在唯一性.     

一类趋化性模型行波解的存在性

讨论了一类基于趋化性现象的强耦合非线性偏微分方程组,利用相轨分析方法,得到了该趋化性模型行波解存在的充分条件和必要条件.     

Different Behaviour for the Solutions of Some Chemotaxis Equations

Inbiology,itisveryimportanttoinvestigatethemovementofsomecellsororganismsinsomegivenbiologica1system(cf.[1,2]).Inordertounderstandhowthemovementrulesareaffectedbytheeffectofthechemo-attractant,OthmerandStevensintroducedin[1]severalgeneralclassesofpartialdifferentialequations.Inoneoftheirmodels,theyconsideredamasterequation,i.e.barrierandnearestneighborlatticemodel.Followingalimitingprocessthemodelisdescribedbythefollowingsystemofpartialdifferentialequations:wherep(x,t)istheparticledensityofap…