超声波

In the fourth chapter, the effects of ultrasound on the direct electrosynthesis of solid K_2FeO_4 and the anodic behaviors of pure iron were investigated, and the physical properties of the samples were characterized by means of XRD, FTIR and SEM.

在第四章中，对超声波在14 mol／dm~3 KOH溶液中辅助直接电合成K_2FeO_4固体的影响作了研究，并采用扫描电子显微镜、X-射线衍射和傅立叶红外吸收光谱等技术对超声波作用和无超声波作用直接电合成的K_2FeO_4的表面形貌和结构进行了表征。

The experimental results showed that the existence of ultrasound could decrease the formation potential of ferrate and the passivation extent of iron anode, as well as O_2 evolution rate, which led to higher current efficiency for the direct electrosynthesis of solid ferrate at 65℃in 14 mol/dm~3 KOH solution.

通过对超声波对纯铁电极电化学行为影响的研究表明，超声波能加快电极表面上的固体K_2FeO_4向本体溶液中的转移和延缓电极表面的钝化，还能减慢O_2析出的速度，这可能就是超声波作用能够提高固体K_2FeO_4生成的电流效率的原因。

First of all, it is a elastic wave therefore it can transmit in the most types of materials and it can be used to investigate both their surfaces and their interiors, whereas light can just get through the lucid materials and Hertzian waves is unable to transmit in the conductive materials.

本实验简单介绍超声波的产生方法、传播规律和测试原理，通过对固体弹性常数的测量了解超声波在测试方面应用的特点，通过对试块尺寸的测量和人工反射体定位了解超声波在检验和探测方面的应用。

Results show the optimal conditions for the moringa seed oil extraction are as follows: using petroleum ether as solvent,the ratio of solvent to moringa seeds is 8∶1,extraction time 40 min and extracting twice with the aid of 28 kHz ultrasonic.At the conditions,the ...

结果显示，超声波辅助溶剂萃取辣木籽油的最佳条件为：溶剂石油醚，提取次数2次，提取时间40 min，超声波频率28 kHz，液料比8∶1，在此条件下，辣木籽的平均出油率为35.85%，提取率96%，表明超声波辅助溶剂萃取法是一种可用于萃取辣木籽油的适宜方法。

The ultrasound-assisted extraction process of apple seed oil was studied with orthogonally rotational combination design method.

本研究通过二次回归正交旋转试验，探讨了超声波辅助提取苹果籽油的工艺条件，得出了超声波辅助提取苹果籽油的数学模型，确定了最佳提取条件为：液料比为8，提取时间为35min，提取温度为35℃，超声波频率为60kHz。

4 Results of nondestructive test for weld joints shall be graded according to JB 4730. Following requirements shall be met: a For radial test, quality grade of radial transillumination can't be lower than Grade AB, and that of weld joints shall meet table 10; b For supersonic test, approval standard for weld joints are as follows: 1 For weld joints of 100% supersonic test, grade Ⅰ. 2 For weld joints of local supersonic test, grade Ⅱ. c For magnetic particle test and penetration test, grade Ⅰ.

7.5.4 管道焊接接头的无损检测应按 JB 4730 进行焊缝缺陷等级评定，并符合下列要求： a 射线检测时，射线透照质量等级不得低于 AB 级，焊接接头经射线检测后的合格等级应符合表 10 的规定； b 超声波检测时，管道焊接接头经检测后的合格标准如下： 1 规定进行 100%超声波检测的焊接接头 I 级合格； 2 局部进行超声波检测的焊接接头 II 级合格； c 磁粉检测和渗透检测的焊接接头 I 级合格。

to overcome some disadvantages of low precision,slow dynamic response,unconvenience parameter adjust existing in high-power ultrasonic power supply,it applies intelligent control composed of 8089 microcontroller is proposed.the article introduces the modulation principle of spwm,the composition of high-power ultrasonic power system applying the single chip computer to realize the soft of phase lock loop,the mechanism of work and the software thought.it realizes the low loss,high power factor and the whole performance of the circuit is developed.

摘 要：针对目前大功率超声波电源采用模拟控制电路存在精度低、动态响应慢、参数整定不方便等缺点，采用单片机8089组成智能控制的超声波电源系统。提出了基于spwm技术的双闭环控制策略和应用单片机实现软锁相的工作原理和软件思想，使整个超声波电源实现了低损耗、高功率因数，优化了电路的整体性能。

The precision of the traditional ultrasonic localization method is limited due to unsufficiently precise estimation of the sound velocity and the time of flight, therefore, a new method, the special fusion method for redundancy ultrasonic information was proposed to solve the precision problem.

针对常规的超声波定位方法存在对决定定位精度的声速与渡越时间估算不准，导致定位精度有限的问题，提出了一种新的超声波绝对定位方法，即冗余超声波信息特殊融合法。

For the first time, a new method to blow out and separate volatile pollutants from aqueous solution by ultrasound is presented, which inaugurates a brand-new application field for ultrasonic technique at the same time.

基于空化效应，进行了有机污染物超声降解动力学及其机理的研究；首次提出了利用超声波吹脱分离水中挥发性污染物的新方法，为超声波开辟了一个新的应用领域；率先开展了利用超声波清洗膜污染和减轻浓差极化的中试研究。

Finally,when the ultrasonic wave was applied in the fixation procedure,the fastness to rubbing and soaping were improved.

结果表明，超声波施加于阳离子改性阶段，可以缩短改性时间15 m in左右；超声波施加于染色阶段，可以明显提高涂料上染百分率及染色速率；超声波施加于固色阶段，可以提高湿摩擦牢度半级左右。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。