角形

In this paper, based on nonlinear FEA software ANSYS/LS-DYNA, 3D dynamic simulation models of eighteen-type tubes for backward spinning was established. This paper not only obtained spinning force of tube backward spinning but also obtained the spinning force curves varying with the different reducer ratio, feeds, fillet radius for spinning roller, forming angle and diameter of spinning roller, and diameter blank inner.

以大型非线性有限元软件ANSYS/LS-DYNA为分析平台，通过对18种几何尺寸和参数不同的筒形件三旋轮强力反旋旋压过程的三维动态模拟，得到了它们的旋压力以及旋压力随不同减薄率，旋轮进给量，旋轮圆角半径，旋轮成形角，旋轮直径和毛坯内径的变化曲线。

According to customers requirement, we can lathe all kinds groove on the rubber surface . groove line such as rhombus squareness herringbone linearly ,cycle spirality and so on . also the specification can make to measure such as angle of pitch、quantities of lines、deepth and width of groove.

英强公司制造的槽纹橡胶辊，可根据用户要求在胶辊表面加工各种的槽纹(如菱形、方形、人字形、直线形、环形、螺旋形等)，规格(螺距角、分头数量、槽深、槽宽等)可根据要求定制。

After the low load capacity reason of the sprocket wheel was analyzed, the methods of increasing the load capacity were given from three ways: determining the structure of the rolling wheel, choosing the pressure angle of the tooth sharp and decreasing the friction of the tooth face.

分析了星轮承载能力低的原因，并从辊轮结构的确定、齿形压力角的选择、齿面摩擦的降低等三方面给出了提高星轮齿面承载能力的措施。

The experiment was investigated on the exit flow fields of compressor cascades with normal straight, positive leaned, positive curved, negative curved, and S type curved blades with tailboard at zero incidence.

进行了带尾板的由常规直叶片、正倾斜叶片、正弯曲叶片、反弯曲叶片、S形叶片组成的 5种矩型压气机叶栅在低速风洞上的实验研究，测量了叶栅出口流场，分析了零冲角下不同叶片弯曲形式对叶栅出口总压损失分布情况和主流速度的影响。

The sensitivity and specificity of far-infrared thermography in the diagnosis of lumbar disc herniation were evaluated. Compared with the normal, the thermogram of twenty-three cases on low back with LDH changed. They can be divided into four thermal patterns that is shuttle-liking (8 cases), discontinued in the middle line (6 cases), large regional (5 cases) and nonregular (4 cases) pattern. The temperature of abnormal sides is lower than the counterpart in most cases (nineteen of twenty-three). The thermography diagnosed LDH with sensitivity 90.48% and specificity 66.68%.

结果 F-IRT显示：23例LDH患者腰骶部热形态改变为四种形式：梭形，热区向一侧偏歪或呈角状突起（8例）；夸中线热区不连贯（6例）；骶髂骨上缘呈大片高温热区（5例）；不规则形态（4例），患侧下肢较相对应的对侧胶体的温度，至少有一个患侧部位出现温度下降的有19例(82.61%)，综合CT与F-IRT结果分析：F-IRT诊断腰椎间盘侧后突的灵敏度为90.48%，特异度为66.68%。

Angle trisection resolved, then, for being 7,9,11,13,17, N-gon, it is solved.

三等分角解决了，那末，作正7、9、11、13、17、N边形，也就迎刃而解了。

Key words: geometry; fractal; characteristic angle sequence function; method of undetermined coefficient; square wave Koch-like curve

关键 词：几何学；分形；特征角序列函数；待定系数法；Koch类方波曲线

SUMMARY Welding of aluminum is best accomplished by the following: 1 Use a vee angle of 5-7 degrees.

概要 铝焊接的最佳方式是如下： 1）使用了5-7度V形角。

I plant to undertake the processing of various products, such as steel, iron, copper, aluminium, nylon, plastic, stainless steel, such as round, square, hexagonal, and contoured wood, turning, drilling, milling groove, tapping, rolling, and other flowers .

我厂承接各种金加工制品，如钢、铁、铜、铝、尼龙、塑料、不锈钢等圆、方、六角、以及异形材，进行车削、钻孔、铣槽、攻丝、滚花等。

The cornu , shown with a zoomorphic bell, from Filippo Bonanni 's 1723 book Gabinetto Armonico , a compendium of illustrations of musical instruments.

在大角 ，钟显示了兽形，由菲利普博南尼的1723书 Gabinetto Armonico，一文书汇编音乐的插图的。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐