中杆

Meshing properties and application of major conical surface double envelope Hourglass worm gearing;2. In this paper, the regularities of undercutting and topping of major conical surface envelope hourglass worm is researched.

分析了大锥面包络环面蜗杆的齿顶变尖和根切规律，并通过和平面包络环面蜗杆的比较，得出其在根切和齿顶变尖这两个方面具有比平面包络蜗杆更优良的性能，因而是一种在实际中可替代平面包络、具有广泛应用前景的新型包络蜗杆传动。

Combined with CAD software development of grids,the design method of bolt-sphere joint is put forward based on geometry restriction and intensity restriction. The geomitry dimension of each component is determined firstly based on bolt diameter and contexture, then, maximal pull and stress of diversitied bolt are given after intensity restriction of all components is taken into acount.

在网架结构中，节点起着连接汇交杆件、传递屋面荷载和吊车荷载的作用，而网架结构属空间杆系，汇交于一个节点上的杆件至少有 6根，多的可达 1 3根，各杆件间的夹角大小不同，且节点各构件间的几何关系或强度关系相互制约，使得节点设计十分繁杂。

The origin、 development and present state of the container ship2. The deformation characters and collapse mode of the container ship3. The basic theory of thin-walled structural mechanics: The bending of the thin-walled beam; The unconstrained torsion of the thin-walled member bar; The constrained torsion of the thin-walled member bar with opening; The constrained of the thin-walled member bar with closed port.4. The calculation of the warp stress in the container ship based on the thin-walled structural mechanics theoryModeling of the hull ladder calculation based on referred mechanics theories of thin-walled member bar, calculation of crankle character of the each section, such as sectional coordinates、 Free twist shear flow、 secondary shear flow、 bend shear flow and so on.

本文主要包括下述六个方面的内容： 1 集装箱船的起源、发展和现状 2 集装箱船变形特征和破坏形式 3 薄壁结构力学的基本理论◇薄壁梁的弯曲；◇薄壁杆件的自由扭转；◇开口薄壁杆件的约束扭转；◇闭口薄壁杆件的约束扭转 4 利用薄壁结构力学理论计算集装箱船的翘曲应力建立船体阶梯计算模型，利用薄壁杆件力学中相关理论，求解各断面单元的弯扭特性，包括：扇性坐标、自由扭转剪流、二次剪流、弯曲剪流等。

First, considering the volume expansion process of corroded bolt, the displacement model of mortar inner surface leaded by bolt corrosion is established after the loss of corrosion production is denoted by a filling factor. Second, based on elastic theory, the mortar cracking process is analyzed after the concept of influence coefficient of surrounding rock is introduced in the course of analyzing, and the degree of cracking course affected by surrounding rock parameter is also analyzed; the finite element method is adopted to verify the results.

考虑锚杆锈蚀体积膨胀过程，以填充系数表示砂浆开裂过程中锚杆锈蚀产物的损失，建立了锚杆锈蚀后砂浆内部位移模型，以弹性力学为基础，引入围岩参数影响系数概念，对锚杆锈蚀导致砂浆保护层开裂过程以及围岩参数对开裂过程的影响程度等进行了分析研究，并采用有限元分析方法对其进行了验证。

By making use of contraction mapping principle and similar matrices and graphical method ,this paper discusses some methods of asking its limit in accordance with recurrent sequence of number.3. The criteria whether Ⅰ,Ⅱ,Ⅲ types of crank-rocker mechanisms exist are given and the graphical method of synthesizing crank-rocker mechanisms with quick return characteristics are proposed.

针对目前具有急回特性的曲柄摇杆机构综合中存在的不足，对这类机构的图解法综合进行了深入的探讨，得到了行程速比系数和摇杆摆角取不同值时，Ⅰ型、Ⅱ型、Ⅲ型曲柄摇杆机构是否有解的判据，并给出用图解法综合具有急回特性的曲柄摇杆机构的方法。

The method for calculating the axial force, bending moment and bending deflection sucker rod string with centralizer is obtained applying compressionalto - shear buckling continuous beam - string theory- The design method for sucker rod string with weighting rod is presented in this paper, which takes the modified Goodman stress diagram as strength design principle and...

应用纵横弯曲连续梁柱理论得到了求解带扶正器的抽油杆柱的轴力、弯矩和挠度计算公式；以修正的Goodman应力图为强度准则，并考虑杆柱刚度条件，提出了水平井中抽油杆柱加重设计的方法。最后给出了某油田1口井的抽油杆柱设计实例，说明了该万法的正确性。

Only round in the 60s on the day. Compared round to 9-under-par 61 at Firestone Country Club at the 1990 World Series of Golf,"I think this 66 is close to that 61 that I had in Akron. I would think this is my second- or third-best round of my career."

这圈的成绩对比1990年他在Firestone Country Club打出低于标准杆9杆即61杆的成绩，奥拉沙宝说这次的66杆跟我在Akron上61杆的成绩很接近，我认为这是我职业生涯中第二或第三个最好的一圈。

The main structure of Caiyuanba Yangtze Bridge in Chongqing, up to date the largest-span tie bar arch bridge, is formed by two side tie bars and one middle tie bar which unite the Y-shape rigid framework and arch rid . Therefore, tie bars are one of the key components.

重庆菜园坝长江大桥是迄今为止世界上跨度最长的系杆拱桥，该桥的两根边系杆和一根中系杆将南北两岸的Y型刚构和中间的拱肋连成一个受力整体，构成该桥的主结构，因此系杆是该桥关键受力部位构件之一。

The results reveal that, in some cases, the efficiency of helical gear is not as good as that of worm and wheel drive ; however, the efficiency of the worm helical gear drive in certain torque and the scope of rotational speed is still more close to that of worm and wheel drive.

结果发现虽然斜齿轮与蜗杆的传动效率在试验中不如蜗杆蜗轮传动，但是在一定的转矩和转速范围内，蜗杆斜齿轮传动的效率还是较接近蜗杆蜗轮传动。

In a typical trip out of the hole, the derrickman wears a special safety harness that enables him to lean out from the work platform to reach the drillpipe in the center of the derrick or mast, throw a line around the pipe and pull it back into its storage location until it is time to run the pipe back into the well.

在典型的起钻过程中，井架工系上特殊的安全带，这样能够使他从工作平台上倾斜去接近位于井架或者桅架中央的钻杆，扔一根绳子去缠绕钻杆，然后拉动钻杆到其存储的位置，直到再把这些钻杆下入到井眼时为止。

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。