Objective To study secondary wall formation of helical tracheary elements in the stem of Cucurbita moschata.
目的观察南瓜(Cucurbita moschata)茎螺纹导管发育过程中次生壁的形成过程。
Non-contact tubing thread intelligent detection based on computer visualization technique;
基于计算机视觉的油管螺纹非接触智能检测
The author analyzes the impacts on tubing thread linking intensity of hydraulic tong with the finite element method,the Von Mises and contact pressure distributes of casing thread liking in condition of different holding position for backup tong have been obtained,and he puts forward the technological transformation measures of hydraulic holding system,designs a three-plate-style-tong-door.
采用有限元方法分析了液压钳对油管螺纹联接强度的影响,得到了背钳在不同夹持位置时油管螺纹联接的等效应力和接触应力分布,提出了液压钳夹紧结构的技术改进措施,设计出一种新型的三腭板钳口结构。
An analysis is made of the factors affecting the reliability of numerically-controlled processing line of tubing threads.
归纳并分析了影响油管螺纹数控加工线可靠性的因素,从技术、管理两方面分别提出了提高油管螺纹数控加工线可靠性的具体可行措施。
This paper focuses on computational analysis of casing threads joint performance in the steam injecting well.
针对注蒸汽热采井套管螺纹连接的性能进行了ANSYS计算分析,建立了套管螺纹连接的有限元计算模型,选择了接触分析模块,计算了热采井套管连接螺纹牙的受力分布,得出套管螺纹连接在热采井中的力学性能变化规律。
A finite element two-step casing connection model is founded to analyze the force on the casing threads by using the contact analytical model.
应用ANSYS对双级套管螺纹连接进行性能仿真,建立双级套管螺纹有限元模型,利用接触分析模块,分析螺纹各扣牙受力情况,最后总结了双级套管螺纹连接受力分布规律,并与普通套管螺纹接头作了比较,结果显示双级套管螺纹接头各扣牙受力分布要比普通套管螺纹均匀。
small bundles of spiral vessels
螺纹导管的小维管束
pin-to-box pipe
阳螺纹-阳螺纹管子
Tubing thread is available for API tubing threads and TM threads.
油管螺纹可采用API油管螺纹，或TM螺纹。
NPT tapered tube thread gauges
NPT锥管螺纹量规
Conduits for electrical purposes--Outside diameters of conduits for electrical installations and threads of conduits and fittings
GB/T17194-1997电气导管电气安装用导管的外径和导管与配件的螺纹
Apply pipe dope sparingly on pipe threads, never on valve threads.
在管道螺纹上涂敷螺纹油，但是不要在阀门螺纹上涂螺纹油。
Pipe threads where pressure-tight joints are made on the threads
GB/T7306-1987用螺纹密封的管螺纹
minimum number of pipe threads for connections
管螺纹连接的最少螺纹牙数
Pipe threads where pressure-tight joints are not made on the threads
GB/T7307-1987非螺纹密封的管螺纹
A pipe coupling threaded on both ends.
螺纹接头一种两端都带外螺纹的管子
Gauges for sealing tube threads
用螺纹密封的管螺纹量规
Gauges for nonsealing tube threads
非螺纹密封的管螺纹量规
threaded bottom guide
有螺纹的底部导向鞋
internal ribbed tube
内肋片管，内螺纹管
With certain shapes of nozzle or canula, elongated caps are made to cover both canula and threaded portion, and seal the canula at its top.
根据管口和导管的不同形状，可以制造细长的管盖以覆盖导管和螺纹部分，并在顶部封住导管。
Taper pipe threads with 60 degree
GB/T12716-199160°圆锥管螺纹
Forged steel threaded pipe fittings
GB/T14626-1993锻钢制螺纹管件
API tubing thread
美国石油学会油管螺纹