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  • Komparatistik. Außereuropäische Sprachen/Literaturen  (23)
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  • Komparatistik. Außereuropäische Sprachen/Literaturen  (23)
  • Medizin  (1)
RVK
  • 1
    Online-Ressource
    Online-Ressource
    Research on active detection and direction finding method of autonomous underwater vehicle based on vector sensor
    Acoustical Society of America (ASA) ; 2012
    In:  The Journal of the Acoustical Society of America Vol. 131, No. 4_Supplement ( 2012-04-01), p. 3485-3485
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 131, No. 4_Supplement ( 2012-04-01), p. 3485-3485
    Kurzfassung: To resolve the detection and orientation problem of autonomous underwater vehicle which platform is limited, single vector sensor with orientation ability is selected. The method of detection and bearing estimation based on vector sensor and its performance are researched in this paper. Vector sonar synthetical copy correlator and vector sonar synthetical adaptive correlator are put forward here, which use both pressure and velocity information. The composing principle and realizing method of the two processors above are studied and the processing gain, detecting probability and bearing estimation ability of the two are analyzed in acoustic multi-path condition. The theoretical results simulation and experiments show that all methods studied above have better performance than common copy correlation, and in multipath condition, the vector sonar synthetical adaptive correlation does better than vector sonar synthetical copy correlation in the aspect of processing gain and bearing estimation. Keywords: active detection; direction finding; autonomous underwater vehicle; vector sensor; synthetical copy correlator; synthetical adaptive correlator
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4709155
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2012
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Research on the flow resistance of acoustic materials—Takes Concert Hall at Gulangyu Music School in Xiamen as an Example
    Acoustical Society of America (ASA) ; 2014
    In:  The Journal of the Acoustical Society of America Vol. 135, No. 4_Supplement ( 2014-04-01), p. 2380-2380
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 135, No. 4_Supplement ( 2014-04-01), p. 2380-2380
    Kurzfassung: Different kinds of acoustic materials are used in a concert hall design, which has different functions such as diffusing, reflecting, or absorbing. The cushion of chairs in concert halls usually uses porous sound-absorbing material, whose absorbing attributes are mainly determined by its flow resistance. In the design of Concert Hall at Gulangyu Music School in Xiamen, we measured the flow resistance of materials, trying to acquire the best sound-absorbing attributes by adjusting the flow resistance, and also tested the material samples’ absorbing coefficients in reverberation room. In a nutshell, measuring and analyzing flow resistance is an advanced method in acoustic design, which could help acousticians decide the most suitable absorbing attributes of chairs, and acquire the best sound quality.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4877864
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2014
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    The detection of the temperature structure coefficient of atmospheric boundary layer by acoustic radar
    Acoustical Society of America (ASA) ; 1979
    In:  The Journal of the Acoustical Society of America Vol. 66, No. S1 ( 1979-11-01), p. S7-S7
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 66, No. S1 ( 1979-11-01), p. S7-S7
    Kurzfassung: The magnitude of temperature structure coefficient is computed by sounder echo data. The results showed that the magnitude of CT2 has an obvious fluctuation with time. It has a character of positive bias distribution, and fits the logarithmic normal distribution. The analysis of the spectra CT2 showed that, the spectrum F(k) of CT2 usually fits the k−4 rule in stable and unstable stratifications. There exists a peak range of energy on the frequency range 10−1 − 3 × 10−4 s−1. The analysis of CT2 on time-height counter section indicates that the distribution of Cr CT2 has horizontal stratum structure in stable stratification and it fits the rule CT2 ∝ z−4/3 in unstable stratification. These results measured by acoustic radar agree with earlier direct observations by airplanes [L. R. Tsvang, Radio Sci. 4(12) (1962)].
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.2017966
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 1979
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    The Riccati method for the Helmholtz equation
    Acoustical Society of America (ASA) ; 1996
    In:  The Journal of the Acoustical Society of America Vol. 100, No. 3 ( 1996-09-01), p. 1432-1446
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 100, No. 3 ( 1996-09-01), p. 1432-1446
    Kurzfassung: The operator Riccati equation for the Dirichlet-to-Neumann map is derived from the exact operator factorization of the two-dimensional variable coefficient Helmholtz equation. Numerical schemes are developed for the operator Riccati equation and its variant using a local eigenfunction expansion. This leads to a practical computational method for acoustic wave propagation over large range distances, since the boundary value problem of the Helmholtz equation is reduced to ‘‘initial’’ value problems that are solved by marching in the range. The efficiency and accuracy of the method is demonstrated by numerical experiments including the plane-parallel range-dependent waveguide benchmark problem proposed by the Acoustical Society of America.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.415990
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 1996
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 5
    Online-Ressource
    Online-Ressource
    Time reversal mirror localization technology based on a high-resolution MVDR algorithm
    Acoustical Society of America (ASA) ; 2012
    In:  The Journal of the Acoustical Society of America Vol. 131, No. 4_Supplement ( 2012-04-01), p. 3350-3350
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 131, No. 4_Supplement ( 2012-04-01), p. 3350-3350
    Kurzfassung: Minimum variance distortionless response (MVDR) algorithm has broken through the Rayleigh limit restrictions and makes higher resolutions possible. However, they are easily affected by complex underwater acoustic environments and are not sufficiently robust, so it is difficult to use them in real underwater systems. Time reversal mirror technology is a new method of localization, which may be effectively applied to target detection and localization. To improve its robustness, the MVDR algorithm is combined with time reversal mirroring for passive detection and location. This method makes full use of underwater multipath channel information and reduces the effects of complex underwater environments. The performance of time-reversal MVDR that is based on fixed diagonal loading and robust capon beamforming (RCB) was also studied. Simulations, water tank experiment and sea trial proved it is feasible and practical Keywords: MVDR; time reversal mirror; robust capon beamforming; passive location
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4708551
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2012
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 6
    Online-Ressource
    Online-Ressource
    Research on the measurement and application of surface diffusivity—Takes Concert Hall at Gulangyu Music School in Xiamen as an example
    Acoustical Society of America (ASA) ; 2014
    In:  The Journal of the Acoustical Society of America Vol. 135, No. 4_Supplement ( 2014-04-01), p. 2170-2170
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 135, No. 4_Supplement ( 2014-04-01), p. 2170-2170
    Kurzfassung: The surface diffusivity is an important acoustical attribute of material, which is highly correlated with the sound quality of a concert hall. This paper introduces the theory and practical method to measure the surface diffusivity in laboratory, which is more precise and objective than traditional Surface Diffusivity Index (SDI), and then takes the design of the concert hall at Gulangyu Music School in Xiamen as an example, shows the diffusivity features of its six-sided-cylinder shaped GRG ceiling material, demonstrates the design method and significance of using diffusive material in room acoustic design.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4877056
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2014
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 7
    Online-Ressource
    Online-Ressource
    The detection of the temperature structure coefficient of the atmospheric boundary layer by acoustic radar
    Acoustical Society of America (ASA) ; 1980
    In:  The Journal of the Acoustical Society of America Vol. 68, No. 1 ( 1980-07-01), p. 303-308
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 68, No. 1 ( 1980-07-01), p. 303-308
    Kurzfassung: The magnitude of the temperature structure coefficient is computed from echosonde data. The results clearly show that the magnitude of CT2 fluctuates with time. The fluctuation has a positive bias and fits the logarithmic normal distribution. The analysis of the spectra of CT2 shows that the spectrum Pf(CT2) usually follows the f−3 rule in both stable and unstable stratifications. There is a peak range of energy in the frequency range 10−3 to 3×10−3 s−1. The analysis of time-height cross sections of CT2 indicates that the distribution has a horizontally stratified structure in stable conditions, and follows the rule CT2∝ z−4/3 in unstable conditions. In addition, the variation of CT2 during a cold front passing the station and the relation between the weather system and boundary layer structure are analyzed.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.384596
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 1980
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 8
    Online-Ressource
    Online-Ressource
    Influence of acoustic leakage at liquid-solid interface on the interferometric detecting surface acoustic waves
    Acoustical Society of America (ASA) ; 2012
    In:  The Journal of the Acoustical Society of America Vol. 131, No. 4_Supplement ( 2012-04-01), p. 3477-3477
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 131, No. 4_Supplement ( 2012-04-01), p. 3477-3477
    Kurzfassung: Optical interferometry is an important method to detect the surface acoustic wave due to its advantages, such as without contact and a wide responsive bandwidth. So optical interferometric detecting the surface acoustic wave (SAWs) was widely used to diagnosis the surface and subsurface defection, which senses the SAWs by detecting the instantaneous surface displacement on the interfaces. Commonly, the material are placed in air or a special liquid and the surface acoustic wave is leaky and readiates energy into the liquid under the form of bulk waves. As a results, there has another factor to make the interferometric signal change, that is the refractive index variation of liquid induced by the leakage acoustic wave. In this paper, we will mainly analyze the influence of acoustic leakage at liquid-solid interface on the interferometric detecting surface acoustic waves and discuss the suitable condition of ignoring the influence of leakage wave in liquid on interferometric signal to ensure the measuring accuracy of interferometric sensor.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4709119
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2012
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 9
    Online-Ressource
    Online-Ressource
    Three-dimensional reconstruction of nonplanar ultrasound fields using Radon transform and the schlieren imaging method
    Acoustical Society of America (ASA) ; 2017
    In:  The Journal of the Acoustical Society of America Vol. 142, No. 1 ( 2017-07-01), p. EL82-EL88
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 142, No. 1 ( 2017-07-01), p. EL82-EL88
    Kurzfassung: This paper introduces a numerical method of reconstructing three-dimensional (3D) ultrasound fields from their two-dimensional back-projections to understand the intensity distribution of nonplanar waves. The horizontal planes for line-focused ultrasound fields were roughly elliptical, whereas those for point-focused ultrasound fields were nearly circular. Experimental and simulated results indicated that the ultrasound intensity at the central axis can be calibrated from the light intensity by 3D reconstruction of the ultrasound field. The difference between the measured ultrasound intensity for nonplanar waves in schlieren imaging and the simulation results were discussed. From this work, the 3D ultrasound field becomes possible to be reconstructed.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4994282
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2017
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 10
    Online-Ressource
    Online-Ressource
    Research on perturbation method for nonlinear elastic waves
    Acoustical Society of America (ASA) ; 2020
    In:  The Journal of the Acoustical Society of America Vol. 148, No. 3 ( 2020-09-01), p. EL289-EL294
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 148, No. 3 ( 2020-09-01), p. EL289-EL294
    Kurzfassung: This paper explores the propagation of nonlinear elastic waves in a two-dimensional isotropic medium. The analytical expressions of first-order potentials corresponding to second harmonic acoustic components are obtained and discussed by using the perturbation method. Based on the careful theoretical analysis, it is shown that the first-order P wave always has a resonant term, which is proportional to the propagation distance in the condition of simultaneous excitation of the P wave. On the contrary, the first-order SV wave does not have any cumulative effect. Moreover, the nonlinear interactions between the P wave and SV are also presented.
    Materialart: Online-Ressource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0001980
    RVK:
    EQ 1000
    Sprache: Englisch
    Verlag: Acoustical Society of America (ASA)
    Publikationsdatum: 2020
    ZDB Id: 1461063-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
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