Effect of Sliding／Rolling Ratio on the Temperature Distribution and Traction Coefficient of Line Contact Thermal EHL of Helical Gears

ＥｆｆｅｃｔｏｆＳｌｉｄｉｎｇ／ＲｏｌｌｉｎｇＲａｔｉｏｏｎｔｈｅＴｅｍｐｅｒａｔｕｒｅＤｉｓｔｒｉｂｕｔｉｏｎａｎｄＴｒａｃｔｉｏｎＣｏｅｆｆｉｃｉｅｎｔｏｆ　ＬｉｎｅＣｏｎｔａｃｔＴｈｅｒｍａｌＥＨＬｏｆＨｅｌｉｃａｌＧｅａｒｓＬＩＷｅｉ；ＬＩＵ...     

A Study on Load Distribution along Contact Lines of Cylindrical Involute Gears

ＡＳｔｕｄｙｏｎＬｏａｄＤｉｓｔｒｉｂｕｔｉｏｎａｌｏｎｇＣｏｎｔａｃｔＬｉｎｅｓｏｆＣｙｌｉｎｄｒｉｃａｌＩｎｖｏｌｕｔｅＧｅａｒｓＣＨＡＮＧＳｈａｎ；ＣＨＥＮＣｈｅｎｗｅｎ；ＬＩＷｅｉ；ＸＵＺｈｅｎｚｈｏｎｇ（常山）（陈谌闻）（李威）（徐振忠）（...     

Influence of Carbon Fiber COntents on the Temperature Sensibility of CFRC Road Material

The relationship between the electrical resistivity of carbon fiber reinforced concrete(CFRC) containing different carbon fiber contents and temperature was studied.it is found that carbon fiber contents influence greatly on the temperature sensibility of CFRC road material.Only with a certain amount of carbon fiber can CFRC show a sensitive and stable temperature sensibility.     

The Influence of Annealing Temperature on the Structure and Properties of TiO2 Films Prepared by Sputtering

The TiO₂ films were prepared on slides by dc reactive magnetron sputtering, then the samples were annealed at 300°C, 350°C, 400°C, 450°C, 500°C and 550°C, respectively. X-ray diffraction (XRD) was used to obtain the TiO₂ film crystalline structure; X-ray photoelectron spectroscopy (XPS) was used to study the film surface stoichiometries; surface morphologies were studied by scanning electron microscopy (SEM); the contact angle was tested to indicate the TiO₂ film wettability; and the photocatalytic activity testing was conducted to evaluate the photocatalysis properties. The photocatalytic activity and contact angle testing results were correlated with the crystallinity, surface morphologies and surface ·OH concentration of TiO₂ films. The samples with a higher polycrystalline anatase structure, rough surface and high ·OH concentration displayed a better photoinduced hydrophilicity and a stronger photocatalysis. Funded by the National “863” Project Foundation (No. 2003LG0034)     

The Influence of Annealing Temperature on the Structure and Properties of TiO_2 Films Prepared by Sputtering

1Introduction TiO2hasdrawnagreatdealofworldwideattention becauseofitsgoodabilityinoxidationtosomeairand waterpollutants[14],andmanyresearcheshavebeendone tostudythephotocatalyticactivity[5,6],whichshowsthe futureapplicationofTiO2intheareaofphotocatalysisis verybroad.Therearemanyfactors,whichinfluencethephoto catalyticpropertiesofTiO2films,includingthesurface morphology,crystallinestructure,forbiddenbandwidth andthefilmthickness.Generally,thecrystallinity,spe cificsurfaceareaandphotocatalytic…     

Influence of TiO_2 on the Alkali Resistance and Structure of Invert Glass

1　IntroductionTheinvertglassisakindofglasswhosenumberofbridgeoxygenyisnotbiggerthan 3.WhenthereisonlyoneglassformerSiO2 ,itsmolarcontentisnomorethan66 .7% .Onthisoccasion ,theglassstructuremaychangefromthree dimensionalconsecutivenetworktolaminarnetwork (y =3) ,chainstructure (y =2 ) ,andislandstructure (y =0 ) [1].TheinfluenceofTiO2 onthealkaliresistanceandstructureintheinvertglasshasnotbeenreported .Thispaperwilldiscussitindetail.2　ExperimentalThematerialsusedwerechemicalpureSiO2 ,TiO…     

Effects of Annealing Temperature on the Electrical Conductivity and Mechanical Property of Cu-Te Alloys

The effects of annealing temperatre on the electrical conducitivity and mechanical property of Cu-Te alloys were studied via an AG-10TA electronic universal machine, an SB2230 digital electric bridge, SEM, EDS and XPS. The results show the electrical conductivity increases while the tensile strength fluctuates when the annealing temperature becomes higher because the recrystallization occurs during the annealing process, leading to the density of dislocation decreasing, grain size growing up, but the second phase precipitating sufficiently and simultaneously.     

The Influence of Temperature on the Afterglow Feature of SrAl_2O_4∶Eu,Dy Phosphors

1 IntroductionRare earthions doped strontiumaluminate phosphorsare featured with their wide absorption spectrum band,big photo-absorbent speed,bright phosphorescence ,long-lasting afterglow,high conversion efficiency of energy andgood chemical stability,etc.In addition,they are non-poisonous ,harmless and non-radioactive ,sotheyare con-sidered as a newkind of green,environment-kind and en-ergy savingfunctional materialsthat possess a great appli-cation potential .Infact ,nowadaysthey have been…     

The Influence of Temperature on the Afterglow Feature of SrAl2O4：Eu,Dy Phosphors

Using a self-designed temperature testing box in which Xenon-lamp irradiation can be applied, the afterglow feature of SrAl2O4： Eu, Dy as a function of temperature has been researched. Two sorts of SrAl2O4 ： Eu, Dy phosphors, namely highest quality commercial one and the self-synthesized one by solid-state reaction process were employed. Results reveal a common phenomenon behaving as phosphorescent sudden extinguishments at a certain low temperature although their threshold temperature value （ about 223 K） has a slight difference . The general charueteristic for the influence of temperature on the afterglow feature presents, compared to the luminescent decay at room temperature （RT）, a bigger and faster decrease of phosphorescent brightness with the reduction of temperature, while decay curves still maitain the same pattern composed of a quick decline part and a platform falling part during which the phosphorescent brightness at 273 K is only aboat 1/2 as big as that at RT, and at 253 K the figure has changed to about 1/3. Finally , the reason of previous observed results has been analyzed briefly in theory.     

Distribution, evolution and the effects of rare earths Ce and Y on the mechanical properties of ZK60 alloys

Eight kinds of Mg-RE alloys were prepared. The distribution, evolution, and effects of RE Ce and Y in the investigated alloys were studied by examining the mechanical properties of Mg alloys using X-ray diffraction and scan electron analysis, and by TEM observation. The results show that among the investigated alloys, ZK60-1.5? and ZK60-1.0%Y possessed the optimal mechanical properties. Ce and Y were distributed on the grain boundary during casting. After extrusion and T5 （150℃/0-24 h） heattreatment, Ce and Y were distributed along the extrusion direction and they existed in compound form for both as-casting and asextrusion specimens. The mechanical properties of the investigated alloys were better than those of ZK60 because of the solid solution strengthening of RE and the dispersion strengthening of Mg-RE or Mg-Zn-RE compounds.     

齿廓修形斜齿轮弹性流体动力润滑的热分析

在充分考虑斜齿轮啮合特性的基础上，应用多重网格法，通过联立求解Ｒｅｙｎｏｌｄｓ方程，弹性变形方程，油膜厚度方程，润滑剂的粘度，密度方程，能量方程，润滑剂的粘度，密度方程，能量方向和界面温度方程，成功地获得了修形斜齿轮热弹流问题的数值解，求得了接触区域的压力分布，油膜形状，油膜内的固体表面上的温度分布。     

部分膜点接触弹流的摩擦及温度特性分析

采用简化的部分膜点ＥＨＬ模型，在完全数值求解的基础上，对其摩擦力及表面闪温进行了完全数值分析，结果表明，部分膜弹流下，膜厚比及滑滚比对其摩擦力、表面温度及油膜特性均有很大影响。其热效应不能忽视。     

斜齿轮齿面温度的试验研究

介绍了测试斜齿轮齿面动态闪温的新方法．根据大量测试结果，得到了斜齿轮传动的齿面闪温分布．所进行的齿面胶合试验表明，斜齿轮齿面胶合发展过程与齿面闪温分布规律相符．     

微重力下绕汽柱Marangoni对流的流场及温度场分析

针对在沸腾现象中出现的汽柱现象，抽象出单个汽柱，建立了绕汽柱Marangoni对流的物理模型和数学模型。采用涡量—流函数，利用有限差分法数值模拟了微重力条件下绕汽柱Marangoni对流，得到了汽柱附近液体区域的温度场和流场分布，并进一步分析了无量纲参数Ma、Pr对Marangoni对流的作用规律。结果表明：汽柱汽-液界面上温度梯度的存在，诱发了Marangoni对流；Marangoni对流随着Ma数的增大而在整个液体区域内扩展增强，导致温度分布的非均匀程度愈强烈；Pr数愈大，整个液体区域内的Marangoni对流有减弱趋势，温度分布的非线性程度减弱。这一结论为太空临界热控制提供了一定的理论基础。     

表面波度对线接触往复运动下热弹流润滑特性的影响

应用数值分析方法求解了表面波度对线接触往复运动工况下的热弹性流体动力润滑的影响．分析中假设所研究的润滑油服从Ree-Eyring流变模型,使用3种冲程长度,并使这3种冲程下冲程中心的卷吸速度值完全相等．表面波度扰乱了压力、膜厚和油膜中层温升的分布．由于表面波度的影响,一个周期的两个冲程内的油膜的变化不再一致．同光滑表面接触相比,表面波度在一个周期内提升了油膜中的最大压力和最大温升．降低了最小膜厚和摩擦因数．表面波度对油膜中最大压力的变化影响最大．     

调节幅值影响铸嘴型腔出口速度、出口温度分布的研究

本文研究了不同速度调节幅值对铸嘴型腔流场和温度场的影响，通过仿真分析，结果表明：入口速度变化幅值越大，型腔出口处熔体速度、温度过渡到稳定速度、温度的时间越长。这就为找出布流调整可行域，实现铸嘴型腔流场和温度场的在线调节提供了依据。     

B—S生长技术中界面运动与坩埚下降速度关系的研究

本文研究了B—S生长技术中界面运动速度与坩埚下降速度间的函数关系,即研究了界面真实速度变化规律并对其它影响因素进行了分析。     

不同调节方式影响铸嘴型腔出口速度、出口温度分布的研究

本文研究了两种典型入口速度调节方式对铸嘴型腔流场和温度场的影响。通过数值方法对铸嘴型腔非定常流动和传热进行了仿真分析。结果表明：在同一变化幅值情况下，入口速度阶跃变化、斜坡函数变化后的熔体出口速度、出口温度分布基本相同．