| 1. | And the dependence of mbsl on ultrasonic frequency was analyzed
同时还分析了超声发生装置的特性。 |
| 2. | On ultra - long life fatigue behavior of 50 axle steel under ultrasonic frequency
车轴钢超长寿命疲劳性能研究 |
| 3. | Ultrasonic frequency invariance and its application in flaw classification
超声频率一致性分析及其在缺陷分类中的应用 |
| 4. | The good news is that because this call has an ultrasonic frequency , we are unable to hear it
好在这些声音是超声波频率，所以我们听不到这些声音。 |
| 5. | The vibration modal in ultrasonic frequency band is extracted and the natural frequency of work modal is determined through analyzing the characteristics of principal mode
通过分析各阶主振型的特点来确定电机工作模态的因有频率。 |
| 6. | With the equipment , we have done the following work : in the third chapter , the thresholds of the ultrasonic pressure for mbsl at different ultrasonic frequencies were measured by experiment , for the first time , respectively
第二章内容介绍了本工作使用的关键仪器和自制实验装置。分析了实验中使用的两套致冷ccd图像探测系统的量子效率、噪声、放大倍数等重要参数。 |
| 7. | Results show that , at any frequency , the mbsl field changes with the ultrasonic intensity , and the thresholds of ultrasonic pressures are increased with the ultrasonic frequency . the reason is that , the ultrasound with higher frequency needs higher pressure to make the bubbles provide enough energy to dissociate the water molecules
超声的驱动频率的大小影响气泡的膨胀比(气泡在超声作用下膨胀的最大半径最小半径) ，进而影响气泡爆破时产生的温度，导致不同频率条件下气泡地声致发光阈值不同。 |
| 8. | As one of the most potential experimental stress measurement , ultrasonic technique was widely developed and applied in recent years . limited by their own characters , bulk wave and surface wave in ultrasonic frequency are difficult to be used to measure the internal tangent stress condition from the surface of medium . in many occasions , they will not be able to evaluate the working condition of mechanical components effectively
超声波技术作为最有潜力的实验应力测量技术之一,近年来得到了广泛的发展和应用,然而超声体波与表面波由于其自身的限制性,均无法从表面测量内部的切向应力状况,在许多场合下无法有效进行机械构件工作状态的评估。 |
| 9. | Changes of the longitudinal and transversal wave velocities in different directions and the rock velocity anisotropy as a function of confining pressure have been studied under laboratory ultrasonic frequency for shale and sandstone with marked foliation , which had been saturated by the fluids with different viscosity kerosene and vacuum pump oil and salinity distilled water , 50000
利用不同黏度煤油和真空泵油不同矿化度蒸馏水50mg l和150mg l的nacl溶液的流体对页岩和具有明显层理的砂岩进行饱和，在实验室超声频率下研究样品不同方向纵横波速度以及各向异性参数 |
| 10. | Ultrasound cavitation and sonoluminescence ( sl ) generation have gained great interests in recent years , in this paper , we attributed to discuss the influence of ultrasonic frequency and the gas component inside on the sl threshold pressure and have gotten some value results . in addation , the method for measuring the ultrasonic pressure intensity dynamically by the means of sl image is also discussed
本论文在调研国际、国内有关声致发光研究历史和进展的前提下，对如何降低声致发光的阈值在理论上和实验上展开工作，取得了一定的成果，并设计了一个新的测量超声场强度的方法，实验上证明了其可行性。 |
