管内的

In this paper,heat transfer boundary condition of fin and tube adjacent to air side was determined by means of liquid-solid coupled method for air-side heat transfer calculation.

使用流固耦合准确确定翅片及管内外侧的传热边界条件，并利用场协同理论进行分析。

Methods A total of 56 patients with typical reflux symptoms underwent 24 hour ambulatory pH and Bilitec monitoring.

方法对 5 6例有典型反流症状的患者进行 2 4小时食管内 pH值及Bilitec胆汁同步监测。

Objective Probe into anaesthetize mode ever more suitable for old patient's femur surgical operation.

目的 探讨更适合老年病人股骨手术的椎管内麻醉方式。

Objective To explore the diagnosis and treatment of sacral arachnoid cysts.

目的 探讨骶管内蛛网膜囊肿的诊断和治疗。

Objective:To evaluate the diagnosis and treatment of arachnoid cyst in the sacral canal.

目的：探讨骶管内蛛网膜囊肿的诊断及治疗措施。

Numerical simulations were carried out to study the effect of reversible work and viscous dissipation on the heat transfer characteristics of compressible fluid flow in microtubes.

利用数值方法讨论了压力功和粘性耗散对微细光滑管内可压缩流动换热特性的影响，得出以下结论：微细管内 Ec沿管长是变化的，仅依据入口处的 Ec对压力功及粘性耗散的作用进行取舍是不确切的；等热流及等壁温换热条件下的计算结果显示，在入口 Ma及长径比较大时，考虑压力功及粘性耗散时得出的 N u要小于常规尺度管的理论值，在等壁温情况下，甚至出现了热流方向发生变化的情况

The experimental results show the validness of the mechanism analyses.2. According to the generation mechanism of the leak acoustic signal, the characteristics of the leak acoustic signal are investigated. The auto correlation technology is adopted to descript the leak signal characteristics due to the ability to analyze the coherence of time series. A new procedure to identify the leak acoustic signal from the disturbed noises is proposed based on the conjunction of correlation and approximate entropy algorithm.3. The principle and application in leak location of the correlation and the adaptive filter techniques are introduced. The problems of the traditional leak location methods are analyzed.4. In order to establish the leak detection signal model, the leak acoustic propagation characteristics are investigated experimentally.

从泄漏声产生机理出发，分析了管道泄漏处湍流拟序结构与空泡间相互作用的机理，认为在该机理作用下，泄漏声信号产生过程具有&不可重复&的特征；由于相关函数具有分析时间序列拟序结构的能力，且近似熵从统计的角度区别时间过程的复杂性，因此，提出将信号相关分析和近似熵理论相结合的方法，提取泄漏声信号&不可重复&的特征，辨识管道泄漏故障发生；在实际检测现场，由于各种管内和管外固定声源噪声(如阀门噪声、工地施工噪声等)常导致泄漏误判和漏点定位错误，重点分析了管内固定噪声源的产生机理和特征，为复杂干扰环境下的泄漏辨识提供理论支持。

On this basis deduced in this paper is a similitude criterion, featuring the flow state of the above-cited coal-water mixture in pipes.

由于所输送高固体浓度的煤水混合物常表现为复杂的非牛顿流体的性质且其管内流动存在滑移现象的特性，因此要完全从理论上去计算煤水混合物的管内阻力是困难的［1］。

Experimental results indicate that the B/A value greatly affects the internal Nusselt number and friction factor of the twisted tube because the parameters decrease with the increase of B/A and S/d values, more rapidly with the former, and that the Nusselt number and friction factor of the twisted oblate tube increase respectively by 30%~150% and 20%~50%, as compared with those of the smooth tube at the same Reynolds number and Prandtl number.

实验结果表明：高扭曲比螺旋扁管的管内努塞尔数和阻力系数均随B/A值和S/d值的增大而减小，但随B/A值的增加而减小得更快，B/A值对高扭曲比螺旋扁管的管内传热与流阻性能影响更大；在相同雷诺数和普朗特数下，高扭曲比螺旋扁管管内的努塞尔数为光滑管的1.3~2.5倍；阻力系数为光滑管的1.2~1.5倍。

Sponsored by the Scientific Research Foundation of Harbin Institute of Technology, this dissertation aims to establish microrobot walking in pipe with the diameter of 16mm to 18mm based on abundant of investigation and research work. Different research approaches are implemented, ranging from basis study to unit technology to system. An in-depth research on in-pipe micro locomotive and controller was conducted on the basis of piezoelectric bimorph actuator and the principle of Impact Drive Motion .

本文在&哈尔滨工业大学科学研究基金&支持下，以建立在直径φ16mm～φ18mm的管内行走的微小型机器人及其控制系统为目标，进行了大量的调研和研究工作，采用从基础技术，单元技术到系统集成的研究方法，对基于双压电膜驱动和采用惯性冲击式运动机理的管内移动机器人及其控制系统进行深入的研究。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。