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    Target Aspect Estimation in SAR Imagery Based on Hough Transform and Major Axis Extraction
    基于Hough变换与目标主轴提取的SAR图像目标方位角估计方法
    At the frequency of 40kHz, the -3dB beamwidth of the vertical beam of the whole head is approximately 21.6, its major axis elevated 10 above the rostrum plane;
    在40kHz时整体头垂直波束—3dB束宽为21.6°,主轴相对于吻平面有10°仰角;
    the -3dB beamwidth of the horizontal beam of the whole head is approximately 20, its major axis deviated 12 right-ward from the body axis.
    水平波束—3dB束宽为20°,主轴相对体轴右旋12°。
    Talking about the reform of plate switch braking control system of major axis device of major shaft winch
    浅谈主井绞车主轴装置盘闸制动系统的改造
    The vertical and horizontal -3dB beamwidths of the whole head are 9.4 and 13 narrower than those of the skull respectively, and directions of the major axis are different for the both cases.
    束宽分别比头骨骨骼的测试结果窄9.4°和13°,主轴的指向亦产生变化。
    In this paper, according to the reality operation state of double circular-arc gears, the Reynolds equation and film thickness formula of lubricant enlrainment along major axis of the Hertzian contact ellipse at angle β are calculated. Thus the film thickness of circular-arc gears of type JB2940—81 and FSPH-79 are obtained under the different gear Parameters and operation conditions.
    本文从圆弧齿轮的实际工况出发,根据润滑油沿椭圆接触区的主轴以β角进入接触区的Reynolds方程及其膜厚方程,分析计算了不同齿轮参数、不同工况的81型双圆弧齿轮和79型超短齿双圆弧齿轮传动的膜厚,得出了齿形、齿轮参数以及使用工况对圆弧齿轮传动膜厚的影响规律.
    The paper gives a method of designing a ruled biquadratic surface, with an ellipse and a line paralleled to the major axis of the ellipse as the form condition.
    本文提出了由巳知椭圆和平行于该椭圆主轴的一条空间线段为条件,生成直纹四次曲面的设计方法.
    In the spectral domain,we determined the general dependences of wave vector, polarization properties and scalar wave eqaations on the major axis in the birefringent plates,and carried out the field solutions and G martices of the fin line with Z-cut and Y-cut crystal substrates for examples.
    在谱域坐标系中确立了寻常波(o)和非常波(e)的波矢及电场偏振特性与晶体基片主轴取向的一般关系、标量波动方程和场解。 以Z切和Y切单轴晶体为例给出了场结构和矩阵的解析表达式。
    There are some concept and concise conclusion about major axis, focus, directrix of conic in literatureP. 220-P.
    文献[1]P.220~P.225中给出了二阶曲线的主轴、焦点与准线的概念及一些初步的结论。
    On the basis of analysing velocity modulation major axis motor of machine tool's and major axis power torque characters,This article has studied parameters' relations of NC machine tool's major movement variable speed system in velocity modulation motor and set up the exact formula,and suggested designing rules on the major movement variable speed system of stepless velocity modulation by stages in series of machinery-electricity.
    在分析调速主轴电机及机床主轴的功率扭矩特性的基础上 ,研究了采用调速电机的数控机床主运动变速系统各参数之间的关系 ,并建立了确切的公式 ,分析讨论了机电串联分段无级调速主运动变速系统的设计原则
    Finite strain measurements and estimate of differential stress value show:from Jiaojia major fault to Wang ershan secondary fault,major axis ratio of deformation keybody dropped a little、Kvalue increased a little,the direction of differential stress is NWWSEE trending.
    应变测量和差应力估算表明:从焦家主断裂到望儿山支断裂的糜棱岩变形标志体有主轴比变小、K值增大、古应力值逐渐变小的趋势,韧性变形阶段差应力方向为NWW SEE。
    At present, rather numbers of maximum angular velocity of major axis in NC milling machine is about 3000r/min, which can not reach the tangent velocity required by most harden processing cutting tools.
    目前相当部分数控铣床主轴最高转速3000转/min左右,达不到很多硬加工刀具的线速度要求。
    Some retrofits were made of the rotors in order to solve the existing problem in the applications of 4×11DA type crude oil pumps on the CEP platform in 36-1 oil field in Bohai Bay, the hydraulic shape of the pattern of the impellers was redesigned, and some reasonable materials for the major axis and friction pair of components were selected.
    针对渤海湾36-1油田CEP平台4×11DA型原油外输泵使用中存在的问题,对其转子部件进行了改造。 重新设计了叶轮流道的水力尺寸,并选定了合理的主轴以及零件摩擦副材料。
    The results show that 3D angle interlock woven composites belong to the orthogonal anisotropic material. The strength-direction and modulus-direction curves of tensile,(compress) and bend seem to be maple leafs,and are characterized by double major axis.
    实验结果表明:三维机织角联锁复合材料属正交各向异性材料,各个方向的拉伸、压缩、弯曲强度和模量曲线呈枫叶形,具有明显的双主轴特性;
    The beam current uniformity is better than ±6% along the major axis over 27 cm length at a distance 26 cm from the ion beam source.
    在束流为120mA时,距源26cm处,在主轴方向27cm的范围内不均匀性小于±6%。 该离子束源可作为大面积离子束刻蚀、离子束抛光等的离子束源。
    A novel method of target aspect estimation in SAR imagery based on Hough transform and major axis extraction is proposed here,which fully exploits the information contained in the major axis of the target.
    该文提出了一种基于Hough变换与目标主轴提取的SAR图像目标方位角估计方法。 针对传统基于Hough变换估计方法的不足,在估计过程中引入目标的主轴信息指导方位角的估计。
    Secondly,the straight lines on the contour are found by Hough transform and the major axis is extracted by the detection of feature points on the contour. Finally,a fine estimation can be acquired by the combination of estimation results from both Hough transform and major axis extraction.
    在此基础上,基于Hough变换检测目标轮廓的直边,基于轮廓特征点检测获得目标主轴的大致方向,结合Hough变换检测结果与目标主轴信息获得最终的方位角估计。
    First and second molar attrition scores of three ancient populations——Taosi,Shangma and Yanqing were recorded using Scott's dental attrition record system. Major axis regression analysis was used in molar attrition rate comparison.
    本文采用Scott定义的臼齿磨耗级别系统,对陶寺、上马、延庆三组人牙的第一、第二臼齿磨耗情况进行观察,并通过主轴回归分析对其磨耗速率进行比较和讨论。
 

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