穿孔

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 measures of noise control: the wall of operating room is completely paved with 30mm thickness aluminum perforated acoustic panel, 100mm cavity; the ceiling is completely paved with 30mm thickness aluminum perforated acoustic panel, and 200mm cavity door is used as the sound insulation door.

噪声控制措施：操作室墙面满铺30 mm厚铝穿孔吸声板，100 mm安装后空腔；天花满铺30 mm厚铝穿孔吸声板，200 mm安装后空腔门为隔声门。

The finite element method is applied to analyze the attenuation performance, which is basing on that porous clapboard, porous pipes and absorbent are accurately modeled and the influence of temperature, velocity and tail reflection is taken into account.

采用有限元方法，在对穿孔隔板、穿孔管和吸声材料进行精确建模，并考虑温度、流速和尾管反射对消声的影响的基础上，对消声特性进行分析。

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。

The emergency therapeutic principle of esophageal perforation are blocking esophageal disrupture, antiinfection and nutritional support.

食管破裂穿孔急诊处理原则是闭合瘘口、控制感染、营养支持，其治疗方式根据食管穿孔时间、原因、部位、纵隔及胸腔感染等具体情况选择合理、有效、个体化的治疗方式。

Methods 174 eyes with mycotic corneal ulcer were divided into two groups according to presence or absence of perforation and their prognosis, course of illness, surface area of ulceration, hypopyon, intraocular pressure, microbial spectrum were compared.

回顾性分析近 3年来的 174例真菌性角膜溃疡病例，依据其转归分为穿孔组及未穿孔组，比较两组预后、病程、溃疡面积、前房积脓、眼压及菌种等方面的差异。

It is known that perforin plays an important role in the treatment of cancer,virus and parasite.

摘 要 穿孔素是机体发挥细胞毒作用的重要效应物质，在抗肿瘤、抗病毒及寄生虫治疗中有着重要的意义，但它在动物体内的含量极少，不便于进一步研究及新药开发，用基因工程方法来表达生产穿孔素是将小鼠的穿孔素基因在杆状病毒表达系统中进行克隆与表达。

It's an inevitable tendency to facilitate blast drill with intelligent control systems. Drilling mechanism of Rock Bit and main factors of influencing drilling effects are studied and analyzed synthetically in this thesis.

本文研究了牙轮钻头的破岩机理和影响牙轮穿孔效果的几个主要因素，对牙轮穿孔的几个参数进行了综合分析，同时指出了钻机本身的自动化水平和司机的操作水平也是影响牙轮钻机穿孔效果的一个重要因素。

This study experimentally examined the heat transfer characteristics of 180-deg turning duct under forced convection cooling, as the internal cooling structure of 180-deg turning duct is widely applied to industrial cooling. While several perforated holes were separately arranged within the 180-deg turning duct, the cold flow of better cooling capability was guided in the first duct into the second duct in advance, so as to reduce the overheating of the second duct and realize uniform cooling of the machine members. In addition, the centrally separated holes could yield extra turbulence against the air current, and the interaction between bypass air current and mainstream may possibly improve the overall heat transfer capability.

本研究系以实验方法探讨180度转弯通道於强制对流冷却下之热传递特性，180度转弯通道之内部冷却构型在工业冷却之应用非常广泛，本研究设计将180度转弯通道其中间分隔具多个穿孔，目的在将第一流道内具较佳冷却能力之冷流提早引入第二流道，以减少第二流道产生过热情况，如此可使得机件获得均匀之冷却，此外，中间分隔上之穿孔对气流也具有额外之扰动效果、流经穿孔之旁通气流与主流交互作用，这都有可能增益整体热传能力。

Methods: Five patients with parkinsonism or dystonia were assigned to general anesthesia using an modified endotracheal tube.

本实验依照人体实验之相关规定进行，五位患有帕金森氏症或肌张力异常的病人接受神经立体定位手术。

If you can benefit from this book, it is our honour.

如果您能从本书获益，这将是我们的荣幸。