查询词典 arc-weld

According to the results of comparison between these methods of spectrum evaluation, a new method of power spectrum evaluation of welding arc sound is advanced by means of association of wavelet packet analysis with the Welch average method .

对试验系统采集到的焊接电弧声进行了小波包多层分解，并利用周期图法、Welch 平均法及AR模型法，对各频段信号进行功率谱估计。根据不同谱估计方法的对比结果，提出小波包分解结合Welch 平均法对焊接电弧声进行功率谱估计的新方法。通过对几种规范与飞溅率下的电弧声功率谱的初步分析，发现其功率谱分布具有一定的规律性，并且不同频段谱峰值及其对应频率与焊接飞溅具有相关

It is a compendious, easy realization control method for controlling for arc furnace.

该方法是一种简单、实用的控制方法。

Linear processing at the same time do not stop knives to adjust the circumstances under which a row taper machining, arc, etc. can also be processed to any complex curve.

加工直线的同时在不停车调整刀架的情况下可连续加工锥度，还可以加工圆弧等任何复杂的曲线。

It can describe the interaction between the arc and the gas flow adequately and may avoid the disadvantage of former mathematical models which used cold flow field as initiative computative condition.

它能充分反映气流场和电弧的相互作用，克服了以往的电弧数学模型以冷气流作为初始计算条件的不足。

Before discussing Xing Yunlu's calendrical work, we reviewed the calendrical system of the Ming Dynasty and the status of the calendar crisis and the endeavor of reviving the traditional calendar made by the scholars Gu Yingxiang (1483-1565), Tang Shunzhi (1507-1560) and Zhou Shuxue (?1500-?1572) during the Emperor Jia Jing (1522-1566) in the Ming Dynasty. These scholars had paid attention to the underlying mathematical principles of Shoushi Computus, especially the method on arc and arrow in the geometry.

在讨论邢云路的改历活动之前，首先对明代的历法系统以及传统历法出现危机的状况以及明代嘉靖年间顾应祥(1483-1565)、唐顺之(1507-1560)、周述学(约1500-约1572)等复兴传统历法的努力进行讨论，指出：明代嘉靖年间学者的改历理念主要是注重讨论被钦天监历官忽视的《授时历》的立法原理问题，并对《授时历》弧矢术做了一些有益的探求工作。

C The profile is of berm, which the section below the berm is concave. Using the polynomial curve to fit the shapes of the mean profile, the exponential equation of the equilibrium beach profile in South China was established, which has a general form: y=〓+ C. 2 It's obvious for the beach processes to vary with seasons. The main variation processes of beach profiles are composed of four kinds of mode which are the equilibrium profile mode, the berm mode, the foreshore mode and the bar mode. 3 Beach systems of the arc-shaped coast in South China exhibit an wide range of morphologic and dynamic variability with respect to both time and local environment.

此外，采用多项式曲线对平均剖面进行拟合，建立了华南海滩均衡剖面的指数公式y=〓C+。2）海滩具有较明显的季节性变化，海滩剖面的变化模式一般可分为均衡剖面模式、滩肩模式、前滨模式及其沙坝模式等4种。3）海滩不同岸段的动力地貌状态在同一空间上的分布具有一定的连续性，在时间上具有一定的更替顺序。

This paper introduces two methods of plasma arc powder automatic surfacing on a valve: helix surfacing and concentric circle surfacing.

介绍了2种阀门等离子弧粉末自动堆焊方式：螺旋堆焊和同心圆堆焊。

Because three differences lie in the pearlite to have the round arc crack which the condensation forms, calls the pearlite structure, the water content 2~6%; The pitchstone has the unique resinous luster, the water content 6~10%; The black sunlight crag has the glassy luster and the conchoidal fracture, the water content is smaller than 2% generally.

三者的区别在于珍珠岩具有因冷凝作用形成的圆弧形裂纹，称珍珠岩结构，含水量2~6%；松脂岩具有独特的松脂光泽，含水量6~10%；黑曜岩具有玻璃光泽与贝壳状断口，含水量一般小于2%。

According to the characteritie of EHV transmission lines fault concomitance with arc, a new protection principle and criterion based on wavelet analysis is first proposed and established, which is able to distinguish fault in-area and out-area.

应用EMTDC对一实际EHV线路的简化模型作了大量的仿真分析，表明该保护原理的正确性以及判据的有效性、可实现性。

The cavity wear of both arc-shaped and cone-shaped was calculated.

以此计算锥形和弧形两种挤压模具型腔的磨损。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。