下筒

The analysis and test results show that the concentration of stresses at the end of fillet welds between the tensile anchor plate and the tensile anchor tube is obvious, and the maximum principal tensile stress occurs in the stress concentration region.

结果表明，锚拉板与锚拉筒之间的连接焊缝下端部应力集中明显，最大主拉应力出现在该区域；在设计疲劳荷载作用下，该结构关键构造细节处均未发现疲劳裂纹，结构疲劳性能满足设计要求。

The bailer is a 5-ft cylinder that is lowered into the well under atmospheric pressure.

捞砂筒为一个5英尺圆筒，它在大气压力下被下入井内。

As soon as he went out, I was quickly to finish the repairing, and then washing up the shovel, put in on the stove, and got down the newspaper bag hung on the wall, poured barnyard grass flour into the can container, and began to cook battercakes like yesterday.

他一走，我三两下就勾好了炉缝，洗干净铁锹，支在炉口上，取下挂在墙上的报纸包，拿起罐头筒，倒进稗子面，像昨天那样煎起稗子面煎饼来

Firstly, the equation for stress intensity factors under static uniform pressure is used as the reference case, and then the weight function for a thick-walled cylinder containing a radial edge crack can be worked out. Secondly, the dynamic stresses in uncracked thick-walled cylinders are solved under internal impulsive pressure by using mode shape function method. The solution consists of a quasi-static solution satisfying inhomogeneous boundary conditions and a dynamic solution satisfying homogeneous boundary conditions, and the history and distribution of dynamic stresses in thick-walled cylinders are derived in terms of Fourier–Bessel series. Finally, the dynamic stress intensity factor equations for thick-walled cylinder containing a radial edge crack subjected to internal impulsive pressure are given by dynamic weight function method.

首先采用静态内压下的应力强度因子作为参考解，得到了带径向边裂纹厚壁圆筒的权函数；然后用振型函数方法推导无裂纹厚壁圆筒在冲击内压下的动应力响应，分析中将相应的弹性动力学方程解分为满足非齐次边界条件的准静态解和满足齐次边界条件的动态解的叠加，利用傅立叶-贝塞尔级数展开，推导出了厚壁圆筒内动应力的响应历程和分布规律；最后由动应力权函数方法导出带径向边裂纹厚壁筒在冲击内压下的动态应力强度因子计算公式。

The lower end of the discharge chamber body is in hermetically-threaded connection with a fixed electrode; an operation electrode is mounted at the upper end of the discharge chamber body; the lower end of the operation electrode can be movably mounted in a conduction fixed ring; a fit clearance between the lower end of the operation electrode and the conduction fixed ring is 0.1 to 0.15mm; the conduction fixed ring is in hermetically-threaded connection with the upper end of the discharge chamber body; the conduction fixed ring is connected with a grounding wire; a discharge chamber is formed between the conduction fixed ring and the fixed electrode at the inner part of the discharge chamber body; the upper end of the operation electrode is fixedly connected with an insulation handle.

本发明公开了一种隔爆放电器，包括由防爆有机玻璃制成的筒形放电室本体，所述放电室本体的下端密封螺纹连接有固定电极；所述放电室本体的上端安装操作电极，所述操作电极的下端可移动地安装在导电固定环内，与导电固定环配合间隙为0.1～0.15mm，导电固定环密封螺纹连接在放电室本体的上端，导电固定环上连接有接地线；在放电室本体的内部导电固定环和固定电极之间形成放电室，所述操作电极的上端固接绝缘手柄。

Its include: barrel, set up in the barrel components of the screw, fuel tanks, motor oil, the radio front plate, Radio Taiwan after the board and guide column, referred to the radio through the bottom of the front plate connected to the guide block guide Column, referred to Taiwan after the radio connected to the rod on the board.

其包括：机筒，设置在机筒元件中的螺杆，油缸、油马达、射台前板、射台后板、引导柱，所述的射台前板通过下端的引导块连接在引导柱上，所述的射台后板连接在活塞杆上。

According to the conditions under the oil well and the technical requirements,the pump structure is changed from the plunger form to the piston form to compensate the wear in running of the piston ring by elasticity of itself.

活塞式抽油泵是目前普遍采用的采油设备，由于泵筒发生不同程度的磨损，导致在抽油过程中出现泄漏，根据油田井下的工况和技术要求，在不改变泵筒的前提下，把柱塞式结构改成活塞式结构，靠活塞环自身的弹性力来补偿工作运行中的磨损，所研制的活塞环，经油田的实际应用，收到良好的应用效果

When copper concentration was 3.2x10~(-5) mol.L~(-1) or aluminium concentration was 7.41 x10~(-6) mol.L~(-1), two pieces of wing petal of Harmony Violet turn back into tube-shape.

而在铝处理中，随铝浓度的增大，紫花品种的花色先变浅、出现白色亮斑后又逐渐加深，当铝浓度为7.41×10~(-6)mol·L~(-1)时，花朵翼瓣向花瓣下表面卷曲成筒状，而且筒状程度随铝浓度加大而增大。

Based on the practice of the use of φ95mm subsurface sucker rod pump in Shengtuo Oilfield in recent years, the causes of the failure of the pump are analyzed, and relevant precautions are put forward:(1)selecting oil wells with sufficient fluid supply for pumping;(2)under the condition of the pump efficiency being the same, the submergence depth of the pump being somewhat larger than that of the small pump, and 450～500m being feasible;(3)adopting Grade H ultrahigh-strength rod string and fixing a sinker bar at the bottom of the rod string;(4)selecting long stroke and low pumping speed, and more than 5m stroke and less than 6min-1 pumping speed being recommended;(5)adopting zirconium oxide valve ball and seat ＋ spray welded plunger ＋ nitrided barrel.

根据胜坨油田近几年采用φ95mm有杆抽油泵提液的实践，分析了造成这种抽油泵失效的原因，包括与其配套的脱节器失效、抽油杆断脱、泵漏、电动机不配套和生产管理不善等。为增强泵的提液能力和工作可靠性，提出5 项预防措施：(1)选择有充足供液能力的油井；(2)在保持相同泵效的情况下，泵的沉没度应略大于小泵，推荐按450～500m设计；(3)采用H级超高强度抽油杆柱，并在杆柱底部配置一定重量的加重杆；(4)采用长冲程、低冲次的参数匹配，推荐光杆冲程大于5m，冲次小于6min-1；(5)为提高泵筒、活塞和阀座的防腐耐磨性，推荐采用&氧化锆阀球和阀座+喷焊柱塞+氮化泵筒&的结构形式。

The testing results showed that the higher Shore A hardness, tensile strength, elongation at break, modulus at 100% elongation of MMg/NBR vulcanization were obtained when compared to those of C.B./NBR system; and the presser-resistant property of packer-rubber can be improved for 5Mpa with new structure.

结果显示：与炭黑/NBR体系相比，在过氧化物硫化体系下，甲基丙稀酸镁可以有效补强丁腈橡胶，MMg/NBR硫化胶的邵A硬度，拉伸强度，扯断伸长率和100%定伸强度均较高；新设计的胶筒结构简单合理，易卸模，成品率高，并通过模拟试验发现，新的结构形状可以有效改善胶筒的抗破坏性能，耐压差性能平均提高5MPa。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。