In this paper, the mathematical model for steady heat conduction of a circular shell casing is worked out and solved to obtain the formulae for its temperature distribution and fin efficiency at the tip surface and lateral surface. The dimensionless curves are also plotted for engineering calculation.

The results show that electrode degradation mechanism was basically caused by wear due to fracture of local welding between the electrode tip surface and zinc coated sheet steel happen at electrode surface and alloying between electrode and zinc on zinc coated steel during resistance spot welding zinc coated steel.

结果表明：点焊镀锌钢板时电极的失效机制主要是电极和镀锌板之间局部焊接的断裂发生在电极表面而导致的电极磨损以及电极和镀锌板表面的锌之间的合金化。

互联网摘选

The electric field intensity distribution over the tip surface was established through calculation with appropriate voltage boundary condition applied, and it was found that the electric field intensity was the strongest at the apex of the tip, and the field emission current was also the strongest there.

对模型的表面施加电压边界条件，计算得到尖锥表面电场强度分布，电场强度在尖锥顶点最强，场发射电流在此处也最强。

互联网摘选

The results show that during welding process the contact radius increases gradually, the highest temperature is always located at the center of the electrode tip surface, while the electrode stress and current density both concentrate at the edge of contact region.

结果表明：所考察的焊接条件下，接触半径在焊接过程中逐渐增大，电极端面的中部温度最高，而电极压力和电流密度均在接触区边缘集中。

互联网摘选

According to the analysis on the carbon imprints of electrode tips, three parameters were defined to represent the tip surface characteristics: relative radius ( Rr), edge concentration ( EC) and eccentricity ( ECC).

基于对电极压印的分析，定义了3种电极头表面特征参数：相对半径（Rr）、边缘聚集度（EC）和偏心度（ECC）。

互联网摘选

The field emission current density distribution over the tip surface was established using Fowler-Nordheim function, and the emission current over the single tip established by integrating the current density all over the single tip surface was 7 μ A.

由Fowler Nordheim函数可得到尖锥表面的场致发射电流密度分布，对整个尖锥表面进行积分后得到了单个尖锥的场致发射电流约为7μA。

互联网摘选

The effect of TiC coating in electrode tip surface on spheriform electrode degradation during resistance spot welding zinc coated steel was investigated by SEM, EDX and XRD.

利用SEM、EDX和XRD等方法分析了在点焊镀锌钢板时球形电极表面熔敷TiC涂层对电极失效的影响。

互联网摘选

When the tip surface energy was kept unchanged, the minute change in the surface energy of the GeSb_2Te_4 film would cause a significant change in the adhesive force.

当针尖表面能一定时，粘附力的微小变化可以导致GeSb2Te4薄膜的表面能产生较明显变化；

互联网摘选

In the present paper, by using silicon rubber made in China, the successful measurement results of displacement fields in crack tip surface are concisely introduced.

本文简要介绍作者们利用国产硅橡胶材料测定裂纹尖端表面位移场的研究成果。

互联网摘选

The Study of Deposition of TiC on the Electrode Tip Surface of Resistance Spot Welding by Vibrating Electric Sparking

点焊电极表面振动电火花熔敷TiC的研究

互联网摘选

The remained contact area in the center of the tip surface help to maintain satisfactory weld quality.

电极头中部残存接触区的存在有助于维持较好的焊接质量。

互联网摘选

Temperature Distribution and Fin Efficiency at the Tip Surface and Lateral Surface of a Circular Shell Casing

薄壳圆套管端面和侧面的温度分布及肋效率

互联网摘选

Research of defects detection on metal axis tip surface and dimension measurement system

轴尖表面缺陷检测及尺寸测量系统研究

互联网摘选

The Euler/ Kirchhoff method is adopted to calculate the far field noise of UH-1H rotor, and the calculated results are compared with the measured data. The effect of rotor blade tip shape on high speed rotor noise is investigated.

采用CFD与计算声学相结合的Euler Kirchhoff方法对UH-1H直升机旋翼跨声速悬停流动的远场噪声进行定量计算，并将计算结果与实验值进行比较，验证了Euler Kirchhoff方法的正确性。

互联网摘选

I will tell you that this symbol jumps from her pens tip with such speed that it is impossible to follow the method.

我会告诉你，这个符号从她的笔与这样的速度，这是不可能遵循的方法技巧跳跃。

互联网摘选

The simulation results show that, the wind turbine operates with the best tip ratio speed under rated wind speed. The proposed control method has better control performance.

仿真结果表明，在额定风速以下风力机能够有效地保持最佳叶尖速比运行，所提出的分数阶PIλ控制方案具有更好的控制效果。

互联网摘选

Therefore, the low tip tangential speed design of high bypass ratio is a trend.

因此低叶尖切线速度是将来大涵道比风扇的发展趋势。

互联网摘选

Based on the model, the paper studies how to design wind turbine controller, enables the system operating in the vicinity of the maximum power point, when the wind speed below the rated wind speed. That is the tip speed ratio lies in the optimal value.

在建立的模型基础上，研究了当风速在额定风速以下时，如何设计控制器使得风力机运行在最大功率点附近，也就是说将叶尖速比控制在最佳值。

互联网摘选

Combined with the simulation results and the vertical axis of the impeller tip speed ratio theory, that is required to improve the transmission speed increasing ratio, in order to meet the project of Hydropower for water flow energy with low water speed.

结合仿真结果以及垂直轴叶轮叶尖速比的理论推导，表明需提高变速箱增速比，才能符合水流发电装置低水速运行的要求。

互联网摘选

A conventional fixed pitch vertical axis turbine cannot usually start rotating on its own and only is able to work efficiently at very high tip speed ratios. As a result, a self-start motor will be required.

而传统的定桨距垂直轴水轮机构通常不能够独立的启动旋转且只能在非常高的速率下有效地工作，因此自启动马达是必需的。

互联网摘选

Introduction is given to the state of compressure ratio, maximal wheel tip speed, and maximal exhaust temperature, as well as mix-flow trend of turbine and the reliability of radial turbocharger.

介绍了径流增压器压气机压比、最高轮周速度、涡轮混流化、最高废气温度和可靠性等方面的发展现状。

互联网摘选