查询词典 ultrasonic frequency

The effects of matching circuit on resonant frequency and vibrational charac- teristics of piezoelectric ultrasonic transducers were studied.

研究了匹配电路对压电超声换能器共振频率及其振动特性的影响；分析了由匹配电路和换能器组成的能量传输系统的有效机电耦合系数与匹配电路参数之间的关系。

Comprehensive security system includes remote central locking and driveaway locking, ultrasonic intrusion sensing, radio frequency remote control and engine immobiliser Thatcham 1 approved

全面的安全系统包括遥控中央锁，驶离锁定，超声波入侵传感，射频遥控器和发动机锁止

Aim Discuss the diagnoses value and pathology base to galactophore trumour diagnosed by high frequency ultrasonic.

目的 探讨高频超声对乳腺肿块的诊断价值及其病理基础。

This paper has studied preparation of Grignard reagents under phonochemistry and optimum technologic conditions is: the power of ultrasonic is 500W and frequency is 250KHZ, having twelve energy conversion devices, water bath temperature being 20C, solvent being THF,unstirred.

本文探讨了超声波合成格利雅试剂的机理，研究了声化学法制备格利雅试剂氯化苄基镁的最佳工艺条件为：在超声波的功率为500W，频率为25KHZ，有12个换能器的条件下，水浴温度为20℃，以THF为溶剂，不搅拌。

Methods: A dental griding instrument was made based on ultrasonic principle with the frequency of 25～45 kHz.

用超声去除剩余的粘结剂也被证明是一种有效的方法[4 ，6 ] 。

Following, a experiment has been carried out, the incident waves with a frequency band of 200kHz-3 50kHz are used to the experiment, and a series of peak value-time curves are drawn each 10kHz, corresponding time are found through fitting peak value, thus the position of the defect is calculated accurately. The application of awl-shaped sensor head in the heat change water pipe experiment indicates that the ultrasonic guided waves may transmit nearly 50 meters in the pipe, which is not influenced by the elbows and makes it possible to test defects in long distance and large-scale. The water-load pipe experiment indicates that the displace and energy maybe leakage at the near-surface, which is significant for the further research.

而后，采用200kHz至350kHz频段的入射波进行了实验验证，并每隔10kHz绘出一条峰值一时间的曲线，通过拟合峰值点，找到对应的时间，从而准确的计算出了缺陷的所在；应用锥形探头的热交换水管的实验表明，超声导波可以在管道中传播了近50米的距离，且不受弯头的影响，从而使得长范围、大规模检测成为可能，水载管实验说明了离面位移和能量可能会发生泄漏的特性，为导波的深入研究和应用作了铺垫。

And provide our customers professional design for a variety of demanding high frequency ultrasonic welding mold and weld die.

并为客户专业设计制作各种高难度的超声波焊接模具及高周波熔接模具。

Business:Δ production and marketing 15 KHZ, 20KHZ various sizes of plastic ultrasonic welding machine;Δ plastic production and marketing of various specifications High Frequency Weld, synchronous links, induced induction machine;Δ production and marketing of plastic welding machine rotary;Δ electric production and marketing of plastic weld Machine;Δ production and sales of various non-standard specifications for plastic welding machine;Δ professional design and manufacture of various specifications welding the first mold all kinds of welding and maintenance equipment; Note: welding the first mold and mechanical maintenance warranty period of three months, the new machine - Use of one year.

经营范围：Δ产销15KHZ、20KHZ各种规格超声波塑胶熔接机；Δ产销各种规格高周波塑胶熔接、同步熔断、诱导感应机；Δ产销旋转式塑胶熔接机；Δ产销电热式塑胶熔接机；Δ产销各种规格非标式塑胶熔接机；Δ专业设计制造各种规格焊头模具及维修各类焊接机械设备；注：焊头模具及机械维修保用期三个月，新机器保用期一年。

According to the ultrasonic motors chich were proposed and designed in our laboratory, a novel driving circuits has been developed and it can generate signal with the frequency ranging from 10 to 100 kHz, the value of Vp-p below 180 V.

该驱动电路由干电池提供直流电源，产生频率范围为10-100 kHz，电压峰峰值为0-180 V可调的超声波信号。

A novel Pseudo-Random Frequency-Modulated pulse sequence used to fire ultrasonic transducer is put forward in this thesis.

本文提出了一种伪随机调频脉冲序列解决超声串扰的方法。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。