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- Acoustic impedance tests 声阻抗试验
- 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。
- 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。
- Do you perform the impedance test and your capability &frequency?please describe how to control impedance and retain the coupon sample. '是否有做阻抗测试?频率和能力如何?请描述你们怎样控制阻抗和保留的样品?
- 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。
- 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;
- 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 corrosion inhibition effect of molybdate inhibitor in tap water on 20A carbon steel has been studied with electrochemical polarization curve and impedance test. 为此，通过电化学极化曲线与交流阻抗实验，研究了钼酸盐系列缓蚀剂在自来水中对20A碳钢的缓蚀情况。
- 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。
- 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。
- 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。
- There are some parameters that influence the multilayer microperfrated structure, which make acoustic impedance and absorption cofficient to compute complicatedly. 摘要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。
- Current interpretation of impedance monitoring relies on use of symptom correlation measures (SI, SSI, or SAP). The therapeutic implications of an abnormal impedance test are not yet proen. 在最初抱怨胸痛或者食管外症状的难治反流病人，阻抗检测有效性未得到证实。
- 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。
- According to the acoustic impedance curve of stapedius, we proposed a mathematical model of the ipsilateral acoustic reflex using the methods of cybernetics. 针对镫骨肌声反射的声阻抗变化曲线,采用控制论的方法,对同侧声反射进行了数学建模。
- When a wave emanating from the surface reaches a boundary between two media that have different acoustic impedance (the product of density and velocity), some of the energy is reflected back into the upper medium. 当一个从地面激发的波动到达具有不同声波组抗（速度与密度之乘积）的两种介质之间的分间面时，其部分能量将被反射并回到上覆介质中。
- Misfortune tests the sincerity of friends. [谚]患难识知交。
