点节线

2At drive than will certainly,driven gear, while having the more same sizes, hyperboloid have diameter not larger of gear wheel not initiative than corresponding spiral awl gear wheel, intensity and bigger initiative gear wheel axle and bearing rigidity of higher teeth of a cogwheel.

螺旋角是指在锥齿轮节锥表面展开图上的齿线任意一点A的切线TT与该点和节锥顶点连线之间的夹角。在齿面宽中点处的螺旋角称为中点螺旋角(图5—4)。通常不特殊说明，则螺旋角系指中点螺旋角。双曲面齿轮传动比为

It is determined that the pitch cone of honing wheel depends on the number of teeth in the honing wheel and the angle between the common normal of pitch cones and the plane parallel to both gear and honing wheel axes.

论文摘要：分析了基于交错轴传动的珩齿原理，导出珩磨轮与被珩齿轮在啮合点处的相对滑动速度的数学模型，根据该数学模型可以判定，珩磨轮的节锥面由珩磨轮齿数以及公法线和与珩磨轮及被珩磨齿轮的轴线平行的平面的夹角两个参数所确定。

Analyzing the honing principle of spiral bevel gears based on crossing-axis transmission, the mathematical model of the relative sliding speed of the contact point between honing wheel and gear is achieved. It is determined that the pitch cone of honing wheel depends on the number of teeth in the honing wheel and the angle between the common normal of pitch cones and the plane parallel to both gear and honing wheel axes.

分析了基于交错轴传动的珩齿原理，导出珩磨轮与被珩齿轮在啮合点处的相对滑动速度的数学模型，根据该数学模型可以判定珩磨轮的节锥面是由珩磨轮齿数、公法线和与珩磨轮轴线平行的平面夹角所确定。

Earthworks zero line is determined by constructing the spatial gridding curved surface model of the original terrain and the field leveling design terrain by digital elevation mode. The DEM data of original terrain are obtained by actual measurement. The mathematical correlation is deducted to demonstrate the relationship between the coordinates of any point on spatial line and the direction cosine by the spatial linear equation. DEM data obtaining program is compiled by Fortran9.0 and it is applied automatically to obtain the DEM data of field leveling design terrain.

目的 利用数字高程模型(digital elevation model， DEM)构造原始地形和场平设计地形的空间网格曲面模型，确定土方工程中的零线方法通过实测提取原始地形DEM数据；依据空间直线方程，推导空间线段土任意点的坐标与方向余弦的数学关系式，采用Fortran90程序设计语言编写DEM数据提取程序，自动提取场平设计地形DEM数据；应用Surfers8.0和MapInfo软件构造规则的网格空间曲面模型并导出网格节，点数据；擦除场平设计范围外数据。

When No. 3 oil is used, put in 3000rpm, 8. 59Nm, the gear surface has an obvious plastic flow, an obvious groove is found on pitch line of the driving gear , an obvious edge is found on pitch line of the driven gear . The operating surfaces of both driving gear and the driven one is high in smooth finish, no pitting. Through the analysis on the gear surface only based on the gear in experiment with No.

实验的结果为：ISOVG68机械油作润滑油时，在输入3000rpm，5.96Nm时，齿面发现沿节线出现大面积的点蚀，且齿面有塑性变形；以3#油为润滑油时，在输入3000rpm，8.59Nm时，齿面发生了明显的齿面塑性流动，主动轮在节线处出现明显的沟槽，从动轮在节线处出现明显的棱脊，大小齿轮工作齿面均十分光洁，未发现点蚀现象发生。

However,when increasing x_(12) in the range of larger than 1,the change tendency of the binodal curve position is also affected by the values of x_(13) and x_(23).(3) The ternary phase diagrams of ScCO_2/acetone/CA,ScCO_2/toluene/PSt and ScCO_2/solvent/PVB systems are calculated using the thermodynamic model.

当x_(12)在小于1的范围内变化时，随着x_(12)的增大，均相区增大；然而当x_(12)的数值跨越了该分界点在大于1的范围内变化时，随着x_(12)的增大，双节线位置的改变将受到x_(13)、x_(23)具体数值的影响，从而不再沿单一方向迁移。

It was found that the phase separation behavior of PPESK, ie., PPESK/NMP/H_2O and PPESK/NMP/NSA, all agree with the LCP correlation. The binodal lines of the three systems were calculated according LCP correlation. Therefore, the maximum content of NSA in the casting solution can be calculated according to the binodal lines of the system, which is a scientific solution for the establishment for the composition of casting solution.

实验结果表明LCP关系可以用于描述PPESK／NMP／H_2O和PPESK／NMP／NSA三元体系在相分离时的浊点组成，并根据LCP关系外推计算三元体系的双节线，由此可得铸膜液体系中非溶剂添加剂的上限含量，为PPESK铸膜液体系组成的构建提供了可靠的科学依据。

Study Design. After undergoing L5 hemilaminectomy, chromic gut suture was placed onto the DRG and the animals were sacrificed at various time-points.

研究设计：L5半椎板切除术后，置铬制肠线于背根神经节，实验动物在不同时间点处死。

The optimal entrance point mostly locate at the root of accessoryprocess which adjacent to the mamillary process from L1 to L4, Theadjustable range of entrance points of the 4 segments almost cover theaccessory process, But at L5, The optimal entrance point is much moreoutside away from the accessory process, just at the middle of thetransverse process and the adjustable range of entrance points islimited.

这与钉尾间距的明显变化相一致，手术时应注意调整螺钉钉尖内偏角度观察椎弓根螺钉进钉点发现内外侧螺钉进钉点与内上、外上螺钉进钉点构成接近矩形的梯形区域，最佳进钉点居于内外进钉点中部。L1到L4最佳进钉点位于副突根部靠近乳突处，随着椎体节段下降，进钉点逐渐移向外侧，L1最佳进钉点基本在副突根部骨嵴内侧缘，L2、L3最佳进钉点基本在副突根部骨嵴上，L4最佳进钉点基本在副突根部骨嵴外侧缘。L1到L4可选进钉点范围几乎均包含副突骨嵴。L5最佳进钉点则明显偏外，多数位于副突根部与横突外端连线的中内1／3。

What are you going to do 2,would you like to see some old things with us 3,when and where shall we meet 4,It's rearly seven o' clock 5,I need some books about western culture 6,Mary thanks for inviting me 7,She was a little short and heavy when she was a primary school student 8,we're coming back home by air 9,when the first English settlers arrived in America ,they had a hard time 10,the underlined world"invite"in the third paragraph means ask somebody to do something 11,we can guess there are more family reunions on thankgiving Day than on Christmas Day 12,which part of London do you come from?

你打算去做什么？ 2你想和我们一起去看些旧东西吗？ 3，我们在什么时间，什么地点见面。 4，现在真的7点钟了 5我需要一些有关西方文化的书。 6，Mary 感谢我的邀请。 7，当她是小学生时，她有一点矮，有点胖。 8，我们将乘飞机回来。 9，当第一批英国殖民到达美洲，他们度过了一段艰难的时光。 10，第三段中画线的单词&invite&意思是让某人做某事。 11，我们可以猜到在感恩节中重聚的家庭比在圣诞节中更多。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。