穿孔的

The result of experiment illustrated that three layer micro-perforated panel after optimization can indeed obtain satisfactory absorption curve. The result is accordant with calculation, which can be used on project.

同时选用了结构参数相近的微穿孔板进行实验，实验结果表明，优化设计的三层微穿孔板结构确实能够获得饱满的吸声系数曲线，与理论计算结果吻合，为工程应用提供了依据。

Based on the acoustic absorption theory of microperforated panel and by the means of the theoretical analysis and emulation, the paper focuses on the acoustic characteristic including acoustic impedance, frequency and acoustic absorption coefficient of microperrforated panel working in the combustion chamber which has high temperature and great temperature gradient.

摘要根据微穿孔板吸声理论，采用理论分析和仿真的方法，着重讨论微穿孔板在温度梯度下的声阻抗、共振频率和吸声系数等声学特性，分析其受温度影响变化的机理。

The work of Sullivan and Crocker suggests porosity in the range of 5 to 10% to achieve the expansion chamber.

国外的Sullivan 和 Crocker已推导出穿孔管的穿孔率在5－10％范围内会起到共振腔的效果。

In this paper, based on Maa's theory, the theory of micro perforated panel absorber is summarized, a comparison between the calculated result and the testing result for intermediate and lower frequency standing wave tubes is made.

在微穿孔板消声理论的基础上，根据气动马达消声器的实际需要设计了一种微穿孔板消声器，并通过实验对这种消声器的消声特性和流阻进行了研究。

A device that reads or senses the hole patterns in a punched tape, transforming the data from the hole patterns to electrical signals.

读入或感知穿孔纸带上的穿孔模式，将它所代表的数据转换成电信号的一种设备。同perforated-tape reader

Levels of expression significantly increased after day 4 posttransplantation and persisted through the whole course of rejection, but levels of expression were obviously lower in the peripherial blood than those in portal vein blood. In contrast, the control group showed no expression of mRNA for perforin and granzyme B in portal vein and peripherial blood.

结果 急性排斥肝移植组术后3天门静脉和外周血中均有穿孔素和颗粒酶B基因mRNA表达，4天后表达明显增强，并贯穿整个排斥反应的全过程，但外周血表达的强度明显较门静脉血为弱，同基因对照组术后14天内无穿孔素和颗粒酶B基因表达。

Results The rejection group began to show the mRNA of perforin and granzyme B up-regulation on day 3 posttransplantation, when no histologic evidence of rejection was found. Levels of expression significantly increased after day 4 posttransplantation and persisted through the whole course of rejection, but levels of expression were obviously lower in the peripherial blood than those in portal vein blood. In contrast, the control group showed no expression of mRNA for perforin and granzyme B in portal vein and peripherial blood.

结果 急性排斥肝移植组术后3天门静脉和外周血中均有穿孔素和颗粒酶B基因mRNA表达，4天后表达明显增强，并贯穿整个排斥反应的全过程，但外周血表达的强度明显较门静脉血为弱，同基因对照组术后14天内无穿孔素和颗粒酶B基因表达。

The Lithostegia Ching was considered as a member of Peranemaceae for a long time, according to the research,we found that it has the typical scalariform perforation plates,no associated or crossed phenomena,and some region have intact plate,no dimorphic phenomena,no weblike or threadlike remnants,these suggest that The Lithostegia Ching is in a primal evolutional position.

与传统观点不同，我们认为穿孔板仅存在于端壁的管状分子为导管分子，而端壁和侧壁形态、结构相似，有或无穿孔板的管状分子为管胞，蕨类植物中的管状分子主要为管胞。

Since 1995 the negatie appendectomy rate has been falling, especially in women, and incidental appendectomies, frequent in prior decades, hae been rarely performed.

非穿孔性阑尾炎的25年下降以及与CT和腹腔镜检查更多运用相关的阑尾切除术增加并不会带来穿孔率的增加。

Ultrasonic method is using low-frequency ultrasonic energy cuticle damage and the Hot perforation technology is using more heat through the skin. Laser technology is in the skin melted on the stratum corneum and the micro-needle device is in the stratum corneum have a micro machine to achieve the purpose of transdermal.

研究活跃的促渗技术包括离子导入（使用低电压电流使药物通过皮肤）、电穿孔技术（使用高压短电脉冲创造暂时的皮肤水性通道）、超声波法（使用低频超声波能量破坏角质层）和热穿孔技术（使用热能使皮肤更具透过性）、激光技术、微针装置来实现透皮目的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。