齿

Based on data,aims to set up the mathematical model of the working practice of the cutter gear used on the coal mining machine working in coal layers and the force bearing of the pick-shaped cutter gear.

以试验数据为基础，对采煤机镐形截齿实际工况的煤层和镐形截齿受力建立数学模型；对镐形齿受力进行计算机模拟，且模拟的曲线反映截齿随不同参数的变化。

After analyzing the curvature of the forming surface and the relativ emotion between the forming surface and the curved tooth surface during envelope tooth cutting,the authors work out the equations for calculating the induced normal curvature and geodesic deflection,the principal curvature and direction of the tooth surface of this kind of circular-arc gear .

通过对产形面曲率和包络切齿时产形面与齿曲面相对运动关系的分析，推导出双向圆弧齿轮齿面的诱导法曲率、诱导短程挠率和齿面的主曲率、主方向等计算公式。

They can improve the measuring resolution 2-3 grade higher then ordinary direct subdivision technology. Based on Windows 95 operating system and object-oriented technology, a PCbased open architecture CNC hobbing system (including software platform and servo driving) has been developed and used in Y83A hobber successfully.

开发了基于PC总线的内嵌式开放结构的CNC滚齿机数控系统的配套硬件结构：滚齿范成运动的闭环数字式交流伺服驱动系统和滚刀轴向进给运动的步进伺服驱动系统。Y38A滚齿机上的应用实践，证明所进行的改造和开发的开放式CNC滚齿系统是可行的、成功的。

According the forming condition of ordinary hypocycloid,when moving circle diameter is 2/3 of steady circle diameter,the 3-sharp cycloid is formed.

普通摆线泵的内转子齿廓是短幅外摆线的等距曲线，与其相啮合的外转子齿廓是圆弧，一般内转子为6个齿，外转子为7个齿。

The radiographs were transferred into a computer and calibrated and measured with the image J software. The following factors were measured : [1] the distance from the base of the contact point to the bone crest. [2] The length of the interproximal dental papilla. [3] The width of keratinized gingiva. [4] The interdental distance.

使用测量软体计算距离，并评估下列各项影响齿间乳突存在与否的因子，包括：[1]牙齿接触点到齿槽骨嵴的距离；[2]齿间乳突的长度；[3]齿间角化牙龈的宽度；[4]牙齿间距。

In this case, we tried to use the alveolar bone splitting technique with the Piezosurgery, and the incison line was put in the alveolar ridge as lingually as possible that the integrity of the cortical plate of the alveolar ridge is reserved in the buccal side. Because the resistance to the mesial movement of the posterior teeth is greatly decreased, the possibility of the root resorption or dehiscence is reduced, and the stability after the orthodontic treatment would be improved while the height and width of the alveolar bone increase.

本病例尝试以超音波骨刀，於缺牙区进行齿槽骨劈开手术，其切线尽可能靠近齿槽之舌侧，以使齿槽上的皮质骨板可完整置於颊侧；这样当后牙向前牵引时，才不会因皮质骨板而阻碍前进及牙根被吸收或裂开，同时也能增加齿槽骨之高度与宽度，亦可使矫正后的牙齿更加稳定。

The formation of tooth face is analyzed based on the theory of original curve and area as well as the logarithmic spiral polar coordinates equation.

提出了一种新型锥齿轮-对数螺旋线齿锥齿轮传动形式，并以基曲线和基曲面滚动原理为基础，结合对数螺旋线极坐标方程，分析了对数螺旋线以及对数螺旋线齿锥齿轮齿面的形成过程，建立其了齿面方程。

Results In 7 cases of odontoid process fracture, X-ray demonstrated 4 cases and CT demonstrated 5 cases, whereas the spiral CT reconstruction diagnosed 7 cases, which could display the displacement of fracture clearly. The X-ray and CT showed asymmetric space between left and right gaps of atlantoaxial joint in 6 cases, while spiral CT reconstruction showed normal and excluded the possibility of atlantoaxial dislocation. There was one case of lateral atlantoaxial joint dislocation, which was demonstrated by the spiral CT reconstruction clearly but not by the X-ray and CT scan. There were 3 cases of atlantoaxial congenital deformity (1 case of absence of both posterior arch of atlas and odontoid process and 2 cases of maldevelopment of the odontoid process), which were displayed clearly by spiral CT reconstruction, but misdiagnosed as odontoid process fracture and atlantoaxial subluxation by X-ray and CT scan.

结果 7例齿状突骨折中，X线显示4例，CT显示5例，CT重建确诊7例，且清楚显示骨折移位情况；6例X线、CT显示寰枢椎左右间隙不对称，通过CT重建排除寰枢关节半脱位；寰枢外侧关节脱位1例，CT重建可清楚显示，而X线片和CT平扫均未能显示；寰枢椎畸形3例，分别为齿状突、后弓缺如1例，齿状突发育不良2例，CT重建均能清楚显示，而X线、CT均误诊为齿状突骨折、寰枢椎半脱位。

Consequently, with the support from the minimizing energy method, the results of displacement distribution of the stator at different meshing points were determined as well as the rules were analyzed simultaneously.

以定子齿的截面能量为积分单元，给出了定子齿的势能计算公式，通过最小能量法原理求得了定子齿的位移表达式，分析了在不同的啮合位置定子齿的位移分布规律。

The main products are CNC punch Tape feeder, NC spiral bevel gear milling machine, CNC spiral bevel gear tooth pull machines.

主要产品有数控冲床送料机、数控弧齿锥齿轮铣齿机、数控弧齿锥齿轮拉齿机等。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。