并对含有穿孔管声学元件的消声器进行传递损失计算和消声性能分析。
Their transmission losses are calculated, and their silencing of noise properties analyzed.
使用有限元法计算穿孔管消声器的传递损失，并与实验测量结果进行了比较，二者吻合良好。
The predicted transmission loss of perforated tube silencers using the finite element method and experimental results are compared and showed good agreement.
一个钢管的生产流程如下：圆管坯放在要被切割的高温轧制线上，继续升温，穿孔，轧制直到管坯大小基本成型。
The process of a pipe production is the following: a round cast workpiece is put onto a hot rolling line where it is cut, heated, stitched and rolled till a pipe of necessary size is ready.
阐述了化学导入法(PEG)、电穿孔法、注射法，粒子轰击法、花粉管萌导法及使用其它载体系统的成功实例。
The direct gene transfer systems involved the chemical method (PEG), electroporation, microinjection, particle bombardment, pollen-mediated gene transfer and other systems using various vectors.
目的探讨DMG光固化氢氧化钙修补前牙陈旧性根管穿孔的临床效果及可行性。
Objective To discuss the clinical effects and feasibility of repairing old root canal perforation of front teeth using DMG calcium hydroxide.
通过有限元模拟针对斜轧穿孔过程中毛管的变形特点，对其壁厚不均进行了计算。
Addressing deformation characteristics of the shell during rotary piercing operation, wall thickness unevenness is calculated by means of the FE simulation method.
方法对38颗前牙陈旧性根管穿孔经唇侧根面采用D MG光固化氢氧化钙进行修补，定期回访，观察治疗效果。
Methods 38 teeth of old root canal perforation on the lip were repaired with DMG light-curing calcium hydroxide remedial, and were recalled periodically, observed the effect of treatment.
根管穿孔；光固化；氢氧化钙。
Root canal perforation; Visible light-curing; Calcium hydroxide.
本文通过声波在穿孔声管中传播特性的研究，导出了声波在穿孔声管中传播的声场传递矩阵。
The sonic field transmission matrixes of perforated absorbent pipe is given after the transmission performance of perforated pipe is studied.
分析了热穿孔过程中毛管裂纹的产生及扩展机理。推荐了生产该钢种的合理工艺。
The rational process for producing the steel is recommended on the basis of analyzing the emergence and developing mechanism of cracks in shells of the steel during hot piercing.
顶头是斜轧穿孔主要的变形工具之一，其作用是将实心管坯穿轧成一定壁厚的空心毛管。
Plug is one of the key deformation tools in cross piercing. Its function is turning a solid bar into a hollow bloom.
目的观察采用三氧化矿物凝聚体（MTA）修补根管穿孔的短期临床效果。
Objective To observe short-term clinical effect of root perforation repair using mineral trioxide aggregate(MTA).
一种颗粒过滤器滤筒，具有环绕穿孔的支撑管的织造金属纤维过滤器介质。
A particulate filter cartridge has a woven metal fiber filter medium surrounding a perforated support tube.
分析了小型管坯一次穿孔成型工艺的可行性、产品质量和生产效益。
The possibility of one pass process and its product quality and economy for small billets are analysed.
阐述了穿孔毛管产生同管壁厚差的原因，研究了穿孔和轧管工艺对钢管同管壁厚差的影响。
The causes producing wall thickness difference in a same pierced shell are expounded and the influences of piercing, rolling and mandrel drawing on the difference are studied.
穿孔过程中自身不回转的非开挖气动锤包括冲击矛、夯管锤和爆管锤。
The trenchless pneumatic hammers which don t rotate themselves during drilling include impact moles, pipe ramming hammers and pipe bursting hammers.
她的肺部大部分已经穿孔溃烂，两三个塑料管穿入她的身体以排出肺部的积液。
There were two or three plastic tubes going into her body to drain the fluids in her lungs, most of which had already collapsed and punctured.
实验结果表明，水平连铸管坯的塑性比轧制管坯差，斜轧穿孔时水平连铸管坯形成孔腔的可能性比轧制管坯大得多。
The result shows that it is more possible for the HCC billet to form the cavity than the rolled bloom in rotary piercing operation owing to the former's plasticity less than the latter's.
用塔形试样对比研究了水平连铸管坯和轧制管坯穿孔时顶头前压缩率对孔腔形成的影响。
The effect by pre-plug compression rate on formation of the cavity was investigated in a comparative method with step-down test samples of HCC billet and rolled bloom respectively.
从穿孔机的调整，管坯的加热质量等方面分析了中轧卡产生的原因，并提出了防止中轧卡的措施。
The causes of the mid-seizing in piercing are analysed regarding to the aspects such as mill adjustment and billet heating quality, and the measures to avoid the mid-seizing are proposed.
在斜轧穿孔过程中，由于轧件旋进力克服不了顶头的阻力，因此轧制厚壁管或高合金钢管时在穿孔后期造成后轧卡。
In the cross piercing process, as the piercing precession power can not overcome the resistance force, it will lead to rear-jamming when rolling thick-wall tubes or high alloy tubes.
采用金相、电镜、能谱仪等手段对盘管穿孔原因进行了分析。
The paper analyses the cause of boiler coil perforation by means of metallograph, electron microscope and energy spectrometer.
综述合成氨二段转化废热锅炉失效历程分析 ，废热锅炉列管穿孔、管板泄漏及水压试验泄漏的原因 ，提出解决对策。
The reasons for the leakage of high-pressured ammonia pre-heater row tubes and seals were explained, and how to handle and prevent the occurrence of similar accidents was proposed.
硫酸装置沸腾炉冷却管组穿孔的危害极大。
Hole forming in the cooling bundles of the fluidized bed roaster in sulfuric acid plant is very harmful.
同时既能提供生产大口径、厚壁管所需的圆钢锭，又不需要对轧管穿孔机的辊型进行修改。
Simultaneously, round steel ingots which are used to produce pipes with large diameters and thick walls are provided without modifying roll shapes of rolling pipe piercers.
一种散热鳍片穿孔涂布工具及涂布方法，该工具为一灌入有导热介质的 中空管体，而在管体的一端周缘上设有数个出料孔，并在邻近该出料孔的下 方周缘处环设有具弹性的刮板；
The related perforating coating tool for a heat-conducting fin comprises: a hollow tube filled with conductive medium, some discharge holes on one end of the tube, and a spring scraper under the hole.
一种散热鳍片穿孔涂布工具及涂布方法，该工具为一灌入有导热介质的 中空管体，而在管体的一端周缘上设有数个出料孔，并在邻近该出料孔的下 方周缘处环设有具弹性的刮板；
The related perforating coating tool for a heat-conducting fin comprises: a hollow tube filled with conductive medium, some discharge holes on one end of the tube, and a spring scraper under the hole.
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