查询词典 helicoid

Owing to the key conclusion, this paper lays emphasis on the possible ways of realizing the singular conjugation by single—enveloping method. It is proved that the hyperbolic normal arc surface and the involute helicoid both may conjugate in singular points on the condition of single—envelope.

在奇点共轭理论的工程实现方面，文中明确指出二次包络是获得奇点共轭的有效手段，但并非唯一手段，在满足特定的运动几何条件下，一次包络即可获得奇点共轭。

We build the model for the enveloping worm helix parametric equation and then analyze its relations with the enveloping worm helix tooth surface equation,thus establishing the characteristic model of the involute helicoid enveloping worm′s generative gears.

渐开面环面蜗杆的三维构建属复杂曲面造型，文章在环面蜗杆螺旋线参数方程建模的基础上，分析讨论了其与渐开面环面蜗杆螺旋齿面方程的对应关系，建立了渐开面包络环面蜗杆产型齿的特征模型。

In addition, to form a brass quintet, Mr. Helicoid-horn shifted his instrument from the trumpet to the French horn.

当时为了顺利组成铜管五重奏，蜗牛喇叭先生也从吹奏小号转为吹奏法国号。

Because of the characteristics of tiny ecoenvironment under the gums, gums next stir up an in great quantities poisonous dint's bigger tooth week to the germ in the germ spot, like gum rod bacteria, in the center type rod bacteria, helicoid etc., make the burning disease of gum aggravated and expand to postpone, cause tooth for week bag formation and the tooth slot bone absorption, make tooth burning for week.

由于龈下微生态环境的特点，龈下菌斑中滋生着大量毒力较大的牙周致病菌，如牙龈类杆菌，中间类杆菌，螺旋体等，使牙龈的炎症加重并扩延，导致牙周袋形成和牙槽骨吸收，造成牙周炎。

The shape of the tooth is an involute helicoid.

牙的形状是断开线螺旋面。

This thesis proposes a fill-parametric geometric model of casing threads according to the formation theory of conical helicoid.

本文的选题就是在这样的背景下提出并展开的，作为一项基础性研究，有很高的理论和应用价值。

To simplified the designing, diagram presentation, construction and profile of helicoid al stair, the formation of helicoid is analyzed, and it′s mathematical model is studied.

为简化旋转楼梯的设计、图示、施工及剖面形状，对螺旋面的形成进行了分析，建立了螺旋面的数学模型。

To the dog pathogenesis is the hemorrhagic yellow helicoid and the dog hook end helicoid two blood serums.

对狗致病的是出血性黄疸螺旋体和犬钩端螺旋体两个血清型。

Being formed by linear grain curved surface, helicoid can be expressed by a group of simple lines. Writing two equations of inside and outside of the helicoid, getting any one of simple line′s equation and from which getting the coordinations of two end points by projection transformation, the CAD system of helicoid is achieved. It...

由于螺旋面为直纹曲面，因此可用它的一组素线表示，用极坐标的形式写出内外两条螺旋线的方程，求出任一素线的方程，并通过投影变换求得素线上两端点的坐标矩阵，进而设计出螺旋面的CAD系统，并将其应用于实践，为设计优化决策提供有力的证据。

Chapter 2 establishes a helicoid model of the 3D curved shock surface, which is a fundamental means for investigating the sweep of the 3D shock surface In chapter 3, the first step is to make definitions and detail concepts about various viewpoints of shock surface sweep. Secondly, those sweep angles of the 3D shock are calculated. After that, with the aid of the helicoid model, two general structure similarity variables are derived which are independent of any model, and their importance in shock structure investigations is discussed.

第三章首先给出激波曲面掠的各种基本概念，计算相应掠角；又借助螺面模型得到一般性的掠相似参数，并分析了它在激波结构研究中的意义，设想了激波气动掠参数的测量方法；第四章依据螺面模型探讨了前缘曲线掠与前缘激波曲面掠的关系，可能存在的均匀激波曲面、简单非均匀激波曲面和它们的运动学设计方法，其中得到一些很有用的概念。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。