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- As an objective diagnostic method, aural acoustic impedance measuring device holds a very important position in diagnosing ear diseases and hearing obstacles. 作为一种客观的诊断方法,耳声阻抗测量仪在临床耳疾和听力障碍诊断方面具有重要地位。
- acoustic impedance measurement 声阻抗测量
- Negative coefficients occur where there is a decrease in acoustic impedance across the reflecting interface. 当反射界面上下两侧的声波组抗降低时,反射系数就会出现负值。
- Methods To check on objective acoustic impedance and subjective pure tone audiometry. 方法对外伤性聋进行客观声导抗测试和主观纯音测试。
- And the fluid micro-annulus does not affect the shape of spectra, but its existence is equivalent to lowering the acoustic impedance of the cement. 水泥胶结类型不同,反射谱的特征亦不同;微环的存在相当于水泥环声阻抗变小,基本不影响反射谱的形态。
- The simple impedance measurement system is consisted of piezoelectric element, an impedance analyzer, Al beam and computer. 测试系统由阻抗分析仪、计算机、压电陶瓷片、铝梁组成。
- Opposition to the flow of sound through a surface,acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component. 声音在通过一个表面时受到的阻力,声阻是声阻抗的实部,声抗是声阻抗的虚部。
- A new kind of method for impedance measurement, i.e., electrode A.C. voltage analysis, has been studied. 研究了一种交流阻抗新方法,即交流电位分析法。
- It is difficult for conventional reflection seismic surveys to get the information of low velocity layers underlain high acoustic impedance layers, such as evaporites and basalts. 在蒸发岩、玄武岩等高阻抗岩层发育地区,常规反射地震往往难以获取高阻抗层以下的地层地质信息。
- A kind of impedance measurement is proposed with piezo-electric element which drives the beam and engender dynamic impedance data. 摘要提出了利用压电陶瓷的阻抗测量法的概念,即用压电陶瓷作为驱动源产生动态阻抗信息。
- Obviously, this combined application of AVO attribute analysis and poststack acoustic impedance inversion can effectively identified gas reservoirs in the study area. 综合应用AVO属性分析及叠后波阻抗反演技术可以有效识别研究区气层;
- Experimental tests indicate that the preamplifier can be used for STM topography measurement and NIM impedance measurement simultaneously. 测试表明,该前置放大器能同时用于NIM阻抗测量和STM形貌扫描;
- It was found that confineme n t expands significantly the duration of shock waves,and the peak pressure of sho ck waves enhances with its acoustic impedance. 实验发现,约束层对激光冲击波的脉宽有显著的展宽作用,且冲击波的峰压值随约束层材料的声阻抗的增大而增大。
- The influence of one-dimension compressible bias flow on the acoustic impedance of perforated panels was discussed with consideration of the compressibility of flow. 摘要从理论上研究了一维可压缩偏流对穿孔声阻抗率的影响,并分析了偏流对穿孔粘滞效应的影响;
- Piezoelectric and dielectric properties and acoustic impedance of the composites with different strontium ferrite and barium ferrate contents were measured and investigated. 分析讨论锶铁氧体和钡铁氧体掺杂质量分数对压电复合材料压电性能、介电性能及声阻抗的影响。
- The status of bioelectrical impedance measurement especially the multifrequency segmental bioelectrical impedance measurement of liver diseases is introduced. 该文介绍了生物电阻抗技术在肝病中应用的现状,重点介绍了多频节段电阻抗技术的应用。
- There are some parameters that influence the multilayer microperfrated structure,which make acoustic impedance and absorption cofficient to compute complicatedly. 影响双层微穿孔结构的参数很多,其声阻抗及吸声系数的计算复杂。
- This paper studies the mechanism of noninvasive impedance measurement technique for CBF.An experimental system excited by current pulses with very low duty cycle is implemented. 本课题研究了脑血流无创伤电阻抗测量技术的原理,采用低占空比脉冲电流激励模式实现了一个脑血流测量试验系统。
- On the basis of this, the well restrained inverse acoustic impedance and instantaneous frequency are jointly used to predict the overpressure of Yangxia sag, Kuche depression. 在此基础上,利用井约束反演的波阻抗与瞬时频率联合对库车坳陷阳霞凹陷内的超压带进行了预测。
- If you place the defibrillator electrode on the patient, the device performs the impedance measurement and finishes charging, and finally is ready for shock. 而如果操作者将除颤器放置于病人体表后再进行充电,设备将会测量病人的阻抗并完成充电,并且充电完成后处于除颤准备状态。