管下的

By using grand canonical ensemble Monte Carlo method, machanism for the adsorption of methane in single wall carbon nanotubes at 74.05 K has been investigated. It is found that the adsorption of methane in smaller SWNTs, whose diameters are 1.22nm and 1.632nm, exhibits "pore filling" behavior. In contrast, for the SWNTs of diameter larger than 2.04nm, capillary condesation takes place.

采用巨正则系统MonteCarlo方法研究了甲烷在单壁碳纳米管(Singlewallcarbonnanotube，SWNT)中于低温74.05K下的吸附等温线及吸附机理，发现在两个较小的孔径(1.225nm和1.632nm)下单壁碳纳米管中甲烷的吸附有着明显的微孔所独有的"填充效应"，而在2.04nm以上的孔的吸附中会出现毛细凝聚现象。

The results show that when Re is lower, the f is in rough agreement with Hagen-Poiseuille solution, however, Nu is slightly higher than Hausen solution. When Re reaches at 800, begins to depart from Hagen-Poiseuille solution, and Nu begins to increase quickly, which is due to earlier transition from laminar flow to turbulent flow.

实验结果表明，在低Re下，微管内部的值与Hagen-Po1Seuille解基本一致，但微钢管内部的Nu要略高于Hausen的解；当Re达到800左右时，内径为168μm的管内部的值已开始偏离Hagen-Poiseuille、解，Nu急速上升并形成拐点，这是由于流动发生转换导致的。

With the development of the oilfield, deviated wells, sidetracking wells and horizontal wells have more and more important function,whereas the particularity of casing programme limited the landing depth of sucker rod pump ,and affected the producibility of oil well seriously.

随着油田的开发，斜井、侧钻井、水平井等非直井在油田开发中起到越来越重要的作用，但由于井身结构的特殊性，限制了有杆泵的下入深度，严重影响了油井的生产能力，同时抽油井杆管偏磨，已成为非直井降低产量，增加作业成本、增加杆管成本的主要矛盾。

Nowadays the single tube and single-unit hydroelectric station have been used widely and skillfully, but it is necessary for some large hydropower stations to use tailrace bifurcated tubes, just as Xiaolangdi, Xiangjiaba, Baishe project and so on. So it is significant to study the transients of long tailrace tunnel with tank or without tank.

对于尾水系统，单管单机的布置方式比较成熟，尾水岔管的布置方式目前在大型电站中用的较多，如小浪底、向家坝、百色等，因而研究其在有尾水调压井和无尾水调压井的情况下的过渡过程，很有实用意义。

Using the opened thermosiphon of 38x3 as experimental element and water as working fluid,the characteristics of dynamic low load boiling,stable severe boiling heat transfer coefficient and critical heat flux are gotten for the opened thermosiphon at the pressure of 0.02-0.1MPa and 0.1-0.8MPa respectively,which makes up the drawback that the opened thermisiphon has not yet accurate boiling heat transfer relationship formulas.

本文以工程上常用的Φ38×3的开口封底为实验元件，以水为工质，对开启式热管内的动态低负荷沸腾、稳态旺盛沸腾及临界沸腾特性进行系统的可视化实验研究，实验压力为0.02～0.8MPa，实验得出了Φ38×3的开口封底管在工作压力为0.02～0.8MPa和0.1～0.8MPa下的管内沸腾传热系数及临界热负荷计算关联式，弥补了开口封底管——这一新型传热元件尚无准确的沸腾换热关联式的缺陷。

Then the cultivated chondrocytes were embedded in fibrin glue fused on spongy bone, covered with priosteal flap; the complex was used to repair the femoral trochlea osteochondral defect which size is 3mm × 4mm × 4mm made in rabbit knee joint.

在A组的每只兔子的一侧膝关节股骨滑车部人为造成3mm×4mm的骨软骨缺损，骨刀切除软骨下骨到髓腔渗血为止(厚约4mm)，压迫后FG止血；取髂骨骨块，并尽可能保留松质骨，取下的骨块用PBS反复清洗，以除去血细胞，将松质骨填充在骨缺损处，松质骨面朝向关节腔，高度与周边软骨下骨齐平，把骨膜片生发层朝向关节腔，用无创伤缝合线缝合在周边的软骨或滑膜组织上；向EP管中加入1/2悬液体积的FG主体胶溶液并混匀，再与主体胶等体积的催化剂溶液一同注射入骨膜与骨块密闭的腔隙中；同理处理另一侧膝关节。B组处理与A组相比只是不加入软骨细胞；C组造成骨软骨缺损，FG覆盖创面后单纯用骨膜修复缺损。

This paper describes the screwdown auto-control system of a pilger seamless tube mill which is composed of screwdown motor, frequency converter, PLC and absolute encoder.

本文介绍了由压下电动机、变频器、 PLC 和绝对值编码器构成的周期轧管机的压下自动控制系统。

Studied the solid particles cyclone separation under structural parameters and operating parameters of different hydrocyclone, the results showed that major factor influence split ratio is in the ratio of entrance to exit pressure of hydrocyclone. Exit pressure has a certain influence on the split ratio, the various of the diameter and cone angle of hydrocyclone (in the ratio of entrance to exit pressure is constant) have no influence on split ratio; With diameter and cone angle increase, the separation granularity gradually increasing and recovery ratio decreasing; With entrance pressure increase, the separation granularity of hydrocyclone decrease, the split ratio of underset will increase slowly; With the diameter of overflow pipe increase, the separation granularity of hydrocyclone increasing and recovery ratio decreasing; With the diameter of underset pipe increasing, the separation granularity of hydrocyclone decreasing and recovery ratio increasing.

在不同的水力旋流器结构参数和操作参数下，对固体颗粒的旋流分离进行了分析研究，结果表明：旋流器的排出口比是影响分流比的主要因素，进口压力对分流比有一定影响，水力旋流器的直径变化和锥段角度变化对分流比基本上没有影响；随着直径、锥段角度的增大，分离粒度逐渐增大，回收率降低；随着入口压力增大，水力旋流器的分离粒度变小，底流的分流比会缓慢增加；随着溢流管管径的增加，分离粒度增大，分流比明显减小，回收率降低；随着底流管直径的增加，分离粒度减小，分级效果明显下降，回收率会增加。

As the heart of TWT,the structure stability of grided electron gun directly affect pulse output performance of TWT,and the structural reliability under vibration stress are especial-ly important for today's manufacturers.

栅控电子枪作为行波管的&心脏&，其结构的稳定性直接影响着管的脉冲输出性能，特别是在振动应力下的结构可靠性更是当今生产单位关注的重点。

Based on the simulation of 3D unsteady muzzle brake flow field, computed the force given to the barrel while the powder flow through the muzzle brake, calculated the max backlash velocity, and lastly got the efficiency of muzzle brake.

该方法以带炮口制退器三维非定常流场的数值模拟为基础，通过计算火药气体流经制退器时火炮身管的受力，计算出身管在火药气体作用下的最大自由后坐速度，进而根据制退器效率的定义得到炮口制退器的效率。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了