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- Negative coefficients occur where there is a decrease in acoustic impedance across the reflecting interface. 當反射界面上下兩側的聲波組抗降低時,反射係數就會出現負值。
- Methods To check on objective acoustic impedance and subjective pure tone audiometry. 方法對外傷性聾進行客觀聲導抗測試和主觀純音測試。
- 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. 水泥膠結類型不同,反射譜的特徵亦不同;微環的存在相當於水泥環聲阻抗變小,基本不影響反射譜的形態。
- 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. 聲音在通過一個表面時受到的阻力,聲阻是聲阻抗的實部,聲抗是聲阻抗的虛部。
- 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. 在蒸發岩、玄武岩等高阻抗岩層發育地區,常規反射地震往往難以獲取高阻抗層以下的地層地質信息。
- Obviously, this combined application of AVO attribute analysis and poststack acoustic impedance inversion can effectively identified gas reservoirs in the study area. 綜合應用AVO屬性分析及疊后波阻抗反演技術可以有效識別研究區氣層;
- Practice showed that the combination of CBL and ultrasonic impedance log provides accurate information about the cementation of cement sheath and the coupling of the cement to pipe and formation. 同時使用超聲脈衝和CBL測井儀可以精確地確定水泥殼的膠結情況及水泥與套管、水泥與地層的膠結質量。用實例說明了基於超聲脈衝聲阻抗測井的聲阻抗差分技術在檢測泡沫水泥固井質量的應用效果。
- 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. 實驗發現,約束層對激光衝擊波的脈寬有顯著的展寬作用,且衝擊波的峰壓值隨約束層材料的聲阻抗的增大而增大。
- The influence of one-dimension compressible bias flow on the acoustic impedance of perforated panels was discussed with consideration of the compressibility of flow. 摘要從理論上研究了一維可壓縮偏流對穿孔聲阻抗率的影響,並分析了偏流對穿孔粘滯效應的影響;
- Piezoelectric and dielectric properties and acoustic impedance of the composites with different strontium ferrite and barium ferrate contents were measured and investigated. 分析討論鍶鐵氧體和鋇鐵氧體摻雜質量分數對壓電複合材料壓電性能、介電性能及聲阻抗的影響。
- There are some parameters that influence the multilayer microperfrated structure,which make acoustic impedance and absorption cofficient to compute complicatedly. 影響雙層微穿孔結構的參數很多,其聲阻抗及吸聲係數的計算複雜。
- 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. 在此基礎上,利用井約束反演的波阻抗與瞬時頻率聯合對庫車坳陷陽霞凹陷內的超壓帶進行了預測。
- There are some parameters that influence the multilayer microperfrated structure, which make acoustic impedance and absorption cofficient to compute complicatedly. 摘要影響雙層微穿孔結構的參數很多,其聲阻抗及吸聲係數的計算複雜。
- As an objective diagnostic method, aural acoustic impedance measuring device holds a very important position in diagnosing ear diseases and hearing obstacles. 作為一種客觀的診斷方法,耳聲阻抗測量儀在臨床耳疾和聽力障礙診斷方面具有重要地位。
- According to the acoustic impedance curve of stapedius, we proposed a mathematical model of the ipsilateral acoustic reflex using the methods of cybernetics. 針對鐙骨肌聲反射的聲阻抗變化曲線,採用控制論的方法,對同側聲反射進行了數學建模。
- 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. 當一個從地面激發的波動到達具有不同聲波組抗(速度與密度之乘積)的兩種介質之間的分間面時,其部分能量將被反射並回到上覆介質中。
- The authors use the specific acoustic impedance of MPP which needs to be measured beforehand in the approach, and then, the transfer matrix method is employed to predict the sound-absorbing performance of single or multi-layered MPP. 採用該方法獲得的微孔板吸聲性能曲線與實測結果相當接近,能較好地預測各種組合微孔板的吸聲性能。
- The examined cement specimens were cast according to the national standard,and the acoustic impedance and compressive strength of the specimens after curing for 24 hours were measured. 按國家標準澆鑄油井水泥試塊,養護24h后測其聲阻抗及抗壓強度。
- Those infants who failed the audiometry had to receive comprehensive examinations such as acoustic impedance audiometry(AIA), otoacoustic emission(OAE), auditory brainstem response(ABR) and auditory steady-state response(ASSR). 對未通過者進行聲阻抗、耳聲發射、聽性腦幹反應、聽覺穩態誘發反應的全面綜合檢查以確定聽力損失的性質和程度。
- Do you know how to log in to the system? 你知道怎麼登錄進入這個系統嗎?