查询词典 circular arc

All these results lay a foundation for the improvement of arc welding technology and arc waveform control.

分析结果可为改进焊接工艺和波形控制方法提供依据。

Products are mainly used for arc welding, argon arc welding and other fields.

产品主要用于电弧焊、氩弧焊等领域。

The induction periods and particulate fouling asymptotic resistances of arc line tube were obtained by comparative experiment under various particulate concentration and liquid velocity. The flow field and shear stress in the arc line tube were numerically simulated and analyzed.

文中通过不同流速和微粒浓度下微粒污垢的加速实验，得到了弧线管微粒污垢渐近热阻值和诱导期；同时，用数值方法模拟了弧线管的内部流场和壁面剪切力。

This paper analyzes the characteristic of the Power Factor Correction of arc welding inverter power source , introduces the 12-pulse converter based on delta-type autotransformer connection into arc welding inverter power source ,and its configuration, design scheme and theory on PFC.

分析了弧焊逆变电源功率因数校正技术的特点，阐述了弧焊逆变电源中基于差接三角形自耦变压器十二脉波整流电路的原理与设计及其功率因数校正机理。

In this paper,a study is given to the relationship between vacuum arc current and axial magnetic field keeping the vacuum arc diffuse,a formula of the relationship is deduced.

本文研究了真空电弧与使其保持扩散型的纵向磁场间的关系，并得出了电弧电流与纵向磁场间的关系式。

According to the electric field intensity,arc current,combining bidimensional heat transfer model,the neutral particle temprature,arc section area and non-equilibrium degree of plasma were calculated and compared with our work.

对实验结果进行了分析和处理，根据测量的电弧电场强度、电弧电流，模拟了中性粒子温度、电弧截面面积和等离子体非平衡度的关系式，与实验结果相符。

This is L' Arc de Triomphe, the biggest obstruction in Paris, or maybe in Europe. L'arc de triomphe is a HUGE roundabout, and I have to cross it to the other side to get to Bois de Boulogne.

这是凯旋门，巴黎境内最大的路障~凯旋门是个很巨大的圆环，而我必须穿越它才能到Bois de Boulogne。

The results indicate that electric erosion of contact wire by static arc and moving arc varies from one another.

结果表明，静止电弧和运动电弧对接触线的电气侵蚀程度不同。

The combined motion of grinding the transition arc maintains that the gyration center of the arc moves along the parallel line to the surface of the grinding wheel, and the gyration center of the oxide tool moves along the vertical line to the surface of the grinding wheel.

磨削刀片过渡圆弧时，过渡圆弧的回转中心到砂轮面的距离必须恒等于过渡圆弧的半径，磨削过渡圆弧的复合运动要保持过渡圆弧的回转中心沿平行于砂轮面的直线运动；刀片的回转中心沿垂直于砂轮面的直线运动。

This article detailedly expatiated upon the principles, contents and methods of cropland classification; it analyzed the necessity to combine the work of cropland classification with GIS technology, summarized the attributions of ARC/INFOand some other related softwares; it established the technologic route of cropland classification supported by GIS, by a case study in Liwu Town,Li County Hebei Province, this article expatiated the practicable mechanism of combining the function of ARC/INFO with the work of cropland classification, and put forward some new ideas and approaches of utilizing GIS: this paper put forward the idea of coding the polygons in the basic graphic database such as soil map and land use map according to their attributes, and put forward the detailed coding project; based on the code databases, it expatiated upon the detailed approaches to create single梖actor map and output the final classification map; it put forward the principles and the method of creating classification units in the environment of GIS, that is how to keep the lines of soil polygon, the border of districts and the important objects such as residential areas, banks of rivers and roads ,and how to overlap single梖actor soil map and land use map, and to delete some vector lines of the overlapped map appropriately; it detailed the methods of creating mathematic model of classification coefficients in the environment of computer, and used FOXPRO6.0 programs to realize the automation of calculating coefficients; it represented the method of plotting the final map by overlapping various coverages according to the code tables and lookup tables, the process of outputting the cropland classifying map was finished by program.

本文法对耕地等别划分的原则、内容及方法作了较详细的阐述，介绍了多系数综合修正法的耕地等别计算方法及其具体应用和AHP的确权方法；分析了耕地等别划分工作与地理信息系统技术相结合的必要性，简要介绍了地理信息系统软件ARC／INFO及其他相关软件的功能特点，制定了地理信息系统支持下耕地等别划分的技术路线，通过对河北省蠡县蠡吾镇的实证研究，重点阐述了ARC／INFO及相关数据库软件与耕地等别划分结合的有效机制及GIS应用的一些新思想、新方法：提山了对土壤图和土地利用现状图等基础图形数据库进行特征编码的思想和具体的编码方案，阐述了基于与图形库相链接的特征编码表，单因素图提取、成果图的输出的具体实现方法；提出了GIS环境下耕地单元划分的原则和方法，即在保留土壤因素图斑界线、行政界线和重要地物等的原则下，将土壤单因素图和土地利用现状图进行拓扑叠加，对叠加图中的矢量线进行适当的删除；阐述了在计算机环境下，耕地分等参数计算模型建立的方法，并用FOXPRO6.0语言程序实现了参数计算的自动化；阐述了根据图形库特征编码表和建立绘图符号查找表，按不同图层叠加绘制成果图的方法，该过程用命令程序实现耕地等别图的输出。

This paper designs the communication system of radio telescope FAST.

针对500m口径球面射电望远镜FAST分布式控制系统的特点完成了其通信系统的设计。

Political sheep's step-by-step a large number of fossils unearthed in the county soil Ma Ali after rural village in the middle of sallow pelitic siltstone.

步氏和政羊化石大量出土于广河县阿力麻土乡后山村，产于灰黄色泥质粉砂岩中。