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声吸收     
相关语句
  acoustic absorption
     Effect of Dynamic Mechanical Property on Underwater Acoustic Absorption of Polymer Materials
     材料的动态力学对水声声吸收的影响
     Experimental Investigation of Acoustic Absorption of Detonation by Absorbing Materials Lining Wall
     爆轰波在阻尼管道中声吸收的实验研究
短句来源
     THE ACOUSTIC ABSORPTION IN LAYERED POLYMER MATERIALS
     分层高分子介质中的声吸收
短句来源
  sound absorption
     The dependence of sound absorption in natural sea water on pH value at frequencies 2.91, 6.82 and 10.76 kHz has been measured using the resonator method.
     本文用共振器法测量了天然海水低频声吸收与pH值的关系。 测量频率为2.91、6.82和10.76kHz;
短句来源
     Adaptive Active Control of Sound Absorption Based on the Sound Pressure on the Active Structure Surface
     基于结构表面声压的自适应有源声吸收控制研究
短句来源
     Then based on the near field approach, acoustoelastic theory and unconstrained optimization technique, formulae of calculating sound absorption are analytically derived.
     然后根据求声功率的近场方法、求耦合声波/振动方程的声弹性理论及无约束最优化技术,推导了三种准则下声吸收的计算公式;
短句来源
     THEORY OF SOUND ABSORPTION AND THE RELAXATION MECHANISM OF MgSO_4 IN WATER SOLUTION
     化学反应媒质中的声吸收理论及关于MgSO_4水溶液的弛豫机构
短句来源
     A study on sound absorption properties in various types grain
     多种粮食声吸收的研究
短句来源
更多       
  acoustic attenuation
     MEASUREMENTS OF ACOUSTIC ATTENUATION FOR FREQUENCIES 0.2 kHz-2 kHz IN SANDY SEDIMENTS OF YELLOW RIVER (HUANG HE)
     黄河粉砂沉积层低频声吸收衰减测量
短句来源
  noise absorption
     Active noise absorption by multisources in free field
     多声源的自由场有源声吸收
短句来源

 

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      acoustic absorption
    Evolution of the hyperacoustic pulse profiles related to the diffraction and acoustic absorption effects was studied.
          
    A theory of nonresonant acoustic absorption in Ising magnets is constructed by the nonequilibrium statistical operator method.
          
    Data on acoustic (absorption and velocity of sound), optical (refractive index and optical absorption coefficient), and photoelastic (coefficients of acoustooptical quality and photoelastic constants) properties of KY(MoO4)2 crystals are obtained.
          
    A strong increase of the acoustic absorption is observed in the vicinity of the annealing temperatures.
          
    The physical nature of the elastic inhomogeneities and the acoustic absorption inside the sample which can be "bleached out" by optical radiation is not yet well understood.
          
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      sound absorption
    It is found that the system of crystallites ~100 ? in size does not affect the sound absorption and velocity but essentially changes the nonlinear elastic properties.
          
    With a view to providing sound absorption in a wide frequency range, one-and two-layer sound-absorbing structures, in which nets are used as absorbing layers, are investigated.
          
    Low-frequency sound absorption and attenuation in marine medium
          
    The dependence of the absorption on the pH value (which was revealed in the 1970s) and the experimental data on sound absorption at frequencies higher than 5-10 kHz are also taken into account.
          
    The combined effect of multiple scattering by random inhomogeneities of a waveguide and bottomcaused sound absorption is known to be a fundamental factor that governs the formation of the sound field in a shallow sea [1, 2].
          
    更多          
      sound absorbing
    The damping of the oscillations is treated on the basis of the proposed nonlinear model of the sound absorbing end wall.
          
    A sound absorbing device is considered as an example.
          
    For example, the firewall between the engine and passenger compartment of an automobile must have adequate mechanical strength, good energy and sound absorbing properties, and adequate fire retardance.
          
    The study showed the utility of using these inexpensive materials as sound absorbing devices and as backing materials in the manufacture of ultrasonic transducers.
          
    Effect of geometric structure parameters on the sound absorbing properties of a metal fiber material
          
    更多          
      acoustic attenuation
    Acoustic attenuation in the layers of a microwave transducer at the excitation of longitudinal and shear elastic waves by a piez
          
    However, characterization of adhesive bonds in composite materials using UI has deficiencies due to problems such as high acoustic attenuation and high signal-to-noise ratio.
          
    Firstly, geometric oscillations in the acoustic attenuation are shown to provide a method for the determination of orbitally averaged scattering rates (reciprocal lifetimes).
          
    The shape of the Fermi surface of bismuth is investigated by measurements of the acoustic attenuation in presence of a magnetic field.
          
    At room temperature, the proton exchange leads to the considerable enhancement of acoustic attenuation as compared to the pure samples.
          
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      其他


    In this paper it is shown that our volume visco-elastic theory of fluids is applicable not merely to the case of structural relaxation as apparently regarded by some authors, but is equally

    在这篇论文里我们证明,与某些作者所了解的不同,我们的流体的容变粘滞弹性理论不仅仅是在结构弛豫的情况中有效,而是对所有三种弛豫——热弛豫、结构弛豫与化学弛豫——都是同样有效的。从我们的容变不可逆性方程可以推到Herzfeld与Rice原为热弛豫所假定的热不可逆性方程。又可以证明的是在化学弛豫的情况中我们的容变不可逆性方程也包含着Liebermann由分子运动理论考究所得到的化学不可逆性方程。 关于这理论在声吸收及速变现象中的应用,我们证明利用适当的热力学考究便可以从我们的压缩性理论所给的结果直接推到在热弛豫情况下有效的Bourgin-Kneser方程及在化学弛豫情况下可以有效的Liebermann方程。这个推导并揭发出来Liebermann的声吸收方程仅对液体说可以是一个良好的近似。 我们附带地指出,在气体的情况中,某些已发表的声吸收及速变的实量结果的准确度已可以使我们从这些结果来算定气体的静态与立刻两压缩系数β_0及β_∞,从而确定热容量的两比值γ_0及γ_∞与外态内态两热容量C~(e)及C~(i)。这样我们又能从这些结果取得一些有关分子构造及分子碰撞过程中能量转移的结论。...

    在这篇论文里我们证明,与某些作者所了解的不同,我们的流体的容变粘滞弹性理论不仅仅是在结构弛豫的情况中有效,而是对所有三种弛豫——热弛豫、结构弛豫与化学弛豫——都是同样有效的。从我们的容变不可逆性方程可以推到Herzfeld与Rice原为热弛豫所假定的热不可逆性方程。又可以证明的是在化学弛豫的情况中我们的容变不可逆性方程也包含着Liebermann由分子运动理论考究所得到的化学不可逆性方程。 关于这理论在声吸收及速变现象中的应用,我们证明利用适当的热力学考究便可以从我们的压缩性理论所给的结果直接推到在热弛豫情况下有效的Bourgin-Kneser方程及在化学弛豫情况下可以有效的Liebermann方程。这个推导并揭发出来Liebermann的声吸收方程仅对液体说可以是一个良好的近似。 我们附带地指出,在气体的情况中,某些已发表的声吸收及速变的实量结果的准确度已可以使我们从这些结果来算定气体的静态与立刻两压缩系数β_0及β_∞,从而确定热容量的两比值γ_0及γ_∞与外态内态两热容量C~(e)及C~(i)。这样我们又能从这些结果取得一些有关分子构造及分子碰撞过程中能量转移的结论。 最后,我们讨论了我们的容变粘滞系数的定义的适当性。

    ~~

    本文簡要地評述了現有的MgSO_4水溶液低頻超声反常吸收的理論。指出水化弛豫过程属於一級反应机构。从物理——化学本貭来看,用它来解釋該溶液中的基本实驗結果要比其它机构更优越。文章中利用列昂托維奇的声驰豫吸收的普遍热力学理論,导出了由水化机构引起的声吸收系数的公式。对所获得的結果作了詳細的分析和討論。指出,由該机构来解釋在MgSO_4水溶液中出現的一系列基本声吸收的实驗規律是滿意的。

    The ultrasonic absorption in aqueous suspensions (essentially at low concentrations) has been investigated by the pulse interferometric technique. Epstein's theory on this effect is briefly reviewed with the general expressions as well as those of limiting cases for calculating the sound attenuation coefficients derived and discussed corresponding to the actual experimental conditions.

    本文研究了低浓度松花粉悬浮液中由于悬浮粒子引起超声波的附加吸收问题。实验上测量声吸收和声速都是采用脉冲干涉仪(当测量吸收时曾以移板法、多次反射法及比较法配合进行),频率范围为3—20Mc,温度范围为20°—80℃,在不同浓度重复进行。针对这样的具体实验条件,根据Epstein提出的理论进行了较严格的计算,并从实验和计算结果的比较中得出几点结论。 同时,作者还总结和评述了其他作者关于石松子悬浮液中超声吸收的研究,通过对他们的实验结果和理论值之间的比较,认为他们简单地应用小球或低频极限情况下所得出的理论来解释实验结果是不够严密的,从而推断出理论和实验定性符合的结论实际上也是不真实的。

     
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