管的

The problems in sand soil construction using pipe pushing technology are introduced.

分析了采用机械化顶管的原因，介绍了在砂土层的地质条件下进行机械化顶管施工过程中遇到的难题，从注浆、纠偏、顶进几个方面分析了解决问题的办法。

The positive pressure of 6kPa was given via mask to the nasopharynx of the testee, while the control took normal breath.

被试者经面罩给予6kPa的鼻咽部正压，对照者正常呼吸，高压舱以0.5kPa／s的速率增压至5kPa，被试者和对照者均不采用其他任何主动或被动开放咽鼓管的措施，测鼓室腔压力；高压舱以同样速率增压至20kPa，被试者条件不变，对照者可进行主动或被动开放咽鼓管的措施，测鼓室压。

A mine obtains its muzzle velocity through the work of high pressure gas in interior trajectory, and keeps moving forward only with inertia in interior trajectory terminal stage with the restriction from submarine torpedo tube.

水雷经内弹道的高压气做功获得一定的出管速度后，在内末弹道阶段其仅在惯性的作用下继续运动，且其运动状态受到潜艇鱼雷发射管的约束。

A phase-shifted controlling PWM DC/DC full bridge converter with softswitching is proposed and used to realize a constant current power of20A(5～48V).This full bridge converter utilizes the transformer leakageinductance(or the resonant inductance in series with transformersprimary)and the autoecious capacitance of MOSFET to achieveZVS(Zero-Voltage-Switching),as a result it can decrease the switchingwaste,increase the switching frequency,and diminish the power bulk.

本文使用一种通过移相控制进行脉宽调制的软开关全桥变换器来实现20A(5～48V)恒流源，这种全桥变换器利用变压器的漏感、原边串联谐振电感和功率管的寄生电容来实现开关管的零电压开通，降低了开关损耗，提高了开关频率，减小了电源体积。

The ring has a central annular body portion (21) with a raised bearing surface (22) thereon adapted to contact the inner surface of said calandria tube and prevent contact between said outer surface and said inner surface.

该环件具有一环形的中心体部分（21），该部分具有一适于和所述排管容器管的内表面接触的凸起的环形支承面（22），并且可以防止所述外表面与所述内表面接触。

With the laser power and the time of irradiation increased, the sealing depth of dentinal canaliculi increased.

激光功率不变时，牙本质小管的封闭厚度随照射时间的增加而增加；照射时间相同时，牙本质小管的封闭厚度随激光功率的增加而增加，且具有显著性差异。

This paper reviews the development of synthetic technology of carbon nanotube by catalytic py-rolysis of carbonous compound and compares the advantages and disadvantages of moving support method and floating catalysis method.

介绍了催化热分解含碳化合物合成碳纳米管的技术，比较了基板法和流动催化法的优缺点以及它们的发展前景，并简单地介绍了碳纳米管的应用领域。

Chapter 6 describes the collisional behavior between low-energy hydrogen atom with (5, 5) SWNT in detail.

第七章以两端封闭的（5，5）、（9，0）和（10，10）单壁碳纳米管为例，介绍了单壁碳纳米管的储氢能力和氢原子在单壁碳米管内的聚集过程，并从原子尺度上给出了清晰的图像。

The later can research basic inner process inner mass flow and diathermanous mechanism of components, and apply to use in actual operation process of system's components, emulation of dynamic characteristic and performance's optimized analysis of components.

第3章 建立了风机盘管的稳态模型，通过产品的多次实验平均结果验证了模型的正确性；并对风机盘管的调节和节能进行了模拟和分析。

Under various concentration of Ca〓, cortical MTs in young internodal cells began to slightly bend (0.5mmol/L), twist (5mmol/L), then partly disrupted (15mmol/L); but in old cells, the distribution pattern of MTs didn't change distinctly under such conditions.

而基部生长基本停止的老细胞中，即使延长Oryzalin处理时间，仍残留一些尚未完全解聚的微管小片段；三种浓度的Ca〓处理，微管的排布没有发生明显变化。

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。