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Journal articles on the topic 'Nearfield'

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Published: 4 June 2021
Last updated: 31 January 2023

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1

Wu, Sean F. "Transient nearfield acoustical holography." Journal of the Acoustical Society of America 136, no. 4 (October 2014): 2171. http://dx.doi.org/10.1121/1.4899855.

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2

Williams, Earl G. "Patch nearfield acoustical holography." Journal of the Acoustical Society of America 112, no. 5 (November 2002): 2352. http://dx.doi.org/10.1121/1.4779525.

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3

Ye-Cai, Guo, Wang Chao, and Zhang Ning. "Robust Nearfield Wideband Beamforming Design Based on Adaptive-Weighted Convex Optimization." Mathematical Problems in Engineering 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/5124059.

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Nearfield wideband beamformers for microphone arrays have wide applications in multichannel speech enhancement. The nearfield wideband beamformer design based on convex optimization is one of the typical representatives of robust approaches. However, in this approach, the coefficient of convex optimization is a constant, which has not used all the freedom provided by the weighting coefficient efficiently. Therefore, it is still necessary to further improve the performance. To solve this problem, we developed a robust nearfield wideband beamformer design approach based on adaptive-weighted convex optimization. The proposed approach defines an adaptive-weighted function by the adaptive array signal processing theory and adjusts its value flexibly, which has improved the beamforming performance. During each process of the adaptive updating of the weighting function, the convex optimization problem can be formulated as a SOCP (Second-Order Cone Program) problem, which could be solved efficiently using the well-established interior-point methods. This method is suitable for the case where the sound source is in the nearfield range, can work well in the presence of microphone mismatches, and is applicable to arbitrary array geometries. Several design examples are presented to verify the effectiveness of the proposed approach and the correctness of the theoretical analysis.
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4

Kennedy, R. A., D. B. Ward, and T. D. Abhayapala. "Nearfield beamforming using radial reciprocity." IEEE Transactions on Signal Processing 47, no. 1 (1999): 33–40. http://dx.doi.org/10.1109/78.738237.

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5

Williams, Earl G., and Karl B. Washburn. "Broadband generalized nearfield acoustical holography." Journal of the Acoustical Society of America 80, S1 (December 1986): S94—S95. http://dx.doi.org/10.1121/1.2024057.

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6

Cho, Yong Thung, J. Stuart Bolton, Yong‐Joe Kim, and Hyu‐Sang Kwon. "Two‐microphone nearfield acoustical holography." Journal of the Acoustical Society of America 118, no. 3 (September 2005): 1917. http://dx.doi.org/10.1121/1.4780380.

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7

Bertrand, Paul. "Nearfield high‐resolution source localization." Journal of the Acoustical Society of America 85, S1 (May 1989): S23. http://dx.doi.org/10.1121/1.2026871.

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8

Menzies, Dylan, and Marwan Al-Akaidi. "Nearfield binaural synthesis and ambisonics." Journal of the Acoustical Society of America 121, no. 3 (March 2007): 1559–63. http://dx.doi.org/10.1121/1.2434761.

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9

Mayerhöfer, Thomas G., Sonja Höfer, and Jürgen Popp. "Deviations from Beer's law on the microscale – nonadditivity of absorption cross sections." Physical Chemistry Chemical Physics 21, no. 19 (2019): 9793–801. http://dx.doi.org/10.1039/c9cp01987a.

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10

Meixner, Alfred J., and Paul Leiderer. "Optical near-fields & nearfield optics." Beilstein Journal of Nanotechnology 5 (February 19, 2014): 186–87. http://dx.doi.org/10.3762/bjnano.5.19.

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11

Bi, Chuanxing. "Reconstruction stability of nearfield acoustic holography." Chinese Journal of Mechanical Engineering (English Edition) 18, no. 04 (2005): 504. http://dx.doi.org/10.3901/cjme.2005.04.504.

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12

Luker, L. Dwight, S. Petrie, and A. L. Van Buren. "Nearfield calibration array utilizing piezoelectric polymer." Journal of the Acoustical Society of America 78, S1 (November 1985): S53. http://dx.doi.org/10.1121/1.2022867.

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13

Wu, Sean. "Nearfield acoustic holography and its evolution." Journal of the Acoustical Society of America 112, no. 5 (November 2002): 2353. http://dx.doi.org/10.1121/1.4779527.

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14

Wu, Sean. "Noise diagnosis using nearfield acoustical holography." Journal of the Acoustical Society of America 122, no. 5 (2007): 3027. http://dx.doi.org/10.1121/1.2942826.

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15

Laruelle, Gérard. "Downstream flows: From nearfield to wake." Air & Space Europe 2, no. 4 (July 2000): 87–88. http://dx.doi.org/10.1016/s1290-0958(01)80023-x.

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16

Abhayapala, T. D., R. A. Kennedy, and R. C. Williamson. "Noise modeling for nearfield array optimization." IEEE Signal Processing Letters 6, no. 8 (August 1999): 210–12. http://dx.doi.org/10.1109/97.774869.

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17

Konzelman, Charles J., and Courtney B. Burroughs. "Nearfield acoustic holography in cylindrical spaces." Journal of the Acoustical Society of America 87, S1 (May 1990): S151—S152. http://dx.doi.org/10.1121/1.2028037.

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18

Wantz, Kenneth L. "Unitals in the regular nearfield planes." Journal of Geometry 88, no. 1-2 (March 2008): 169–77. http://dx.doi.org/10.1007/s00022-007-2021-9.

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19

Hayek, S. I., and T. W. Luce. "Aperture Effects in Planar Nearfield Acoustical Imaging." Journal of Vibration and Acoustics 110, no. 1 (January 1, 1988): 91–96. http://dx.doi.org/10.1115/1.3269486.

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The influence of the size of the measurement aperture on the accuracy of reconstruction of the pressure and vector velocity fields using underwater nearfield acoustical holography technique is examined. In this measurement technique, the amplitude and phase of the pressure in the nearfield of a planar structure submerged in water is measured at a set of points on a planar surface which constitute the measurement aperture. The reconstruction of the pressure and velocity vector fields on the surface of a vibrating submerged steel plate was found to be insensitive to the aperture size down to the size of the structure. Examples of aperture sizes ranging from six (6) times down to 1/2 of the size vibrating steel plate are shown. Thus, the total length of time spent on measurements underwater can be drastically reduced.
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20

Matos, J., A. Monteiro, P. Costa, R. Neves, A. Bettencourt, A. Frazao, and C. Santos. "Wastewater diffusion in the estoril coast: theoretical calculations and field studies." Water Science and Technology 38, no. 10 (November 1, 1998): 337–44. http://dx.doi.org/10.2166/wst.1998.0420.

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The Costa do Estoril sewerage system is located on the west side of the Lisbon region, off the mouth of the Tagus river. This system was planned in order to free the pleasant beaches of the region from any wastewater discharge and is prepared to serve, at the final phase, more than one million inhabitants. In the Costa do Estoril a long sea outfall with two diffusers is used for final wastewater disposal. This system has been operating since 1994. In this paper nearfield dilution corresponding to present working conditions are presented. For simulation of nearfield dilution CORMIX 1 and CORMIX 2 (Cornel Mixing Zone Expert System) were applied. The basic data for modelling was selected according to field studies obtained under an ongoing environmental monitoring program.
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21

Aragonès, Albert C., and Katrin F. Domke. "Electrochemical gating enhances nearfield trapping of single metalloprotein junctions." Journal of Materials Chemistry C 9, no. 35 (2021): 11698–706. http://dx.doi.org/10.1039/d1tc01535d.

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Metalloprotein junctions are used as model systems in the field of molecular bioelectronics to mimic electronic circuits. The junction lifetime increase achieved with electrochemical nearfield trapping enables thorough junction characterisation.
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22

Unnikrishnan, S., Datta V. Gaitonde, and Lionel Agostini. "Directivity and intermittency in the nearfield of a Mach 1.3 jet." International Journal of Aeroacoustics 16, no. 3 (April 2017): 135–64. http://dx.doi.org/10.1177/1475472x17709926.

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Local fluctuations in a Mach 1.3 cold jet are tracked to understand the genesis of nearfield directivity and intermittency. A newly developed approach leveraging two synchronized large-eddy simulations is employed to solve the forced Navier–Stokes equations, linearized about the evolving unsteady base flow. The results are summarized by exposing the effect of two acoustically significant turbulent regions: the lip-line and core collapse location. The near-acoustic field displays the clear signature of the two regions. However, for both regions, the nearfield evolution of the perturbation field is characterized by generation of intermittent wavepackets, which propagate into the near-acoustic field and gradually acquire their expected broadband and narrowband characteristics at sideline and downstream angles respectively. The simulations elucidate how higher frequencies are obtained in the sideline directions as lower frequencies are filtered out of the forcing fluctuations. Likewise, shallow-angle acoustic signals arise through filtering of high frequency content in that direction. The directivity and intermittency are connected to the filtering of scales by jet turbulence with empirical mode decomposition. The observations highlight the gradual evolution of seemingly random core turbulence into well-defined intermittent wavepackets in the nearfield of the jet. The manner in which centerline fluctuations are segregated into upstream, sideline, and downstream components is examined through narrowband correlations. A similar analysis for the lipline contribution shows primarily upstream and downstream patterns because of the larger structures in the shear layer.
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23

Kwon, Hyuck Sang. "Multi-Reference Scan-Based Nearfield Acoustical Holography." Key Engineering Materials 321-323 (October 2006): 1249–52. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.1249.

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Multi-reference, scan-based Nearfield Acoustical Holography (NAH) is a useful measurement tool that can be applied when an insufficient number of microphones are available to make measurements on a complete hologram surface simultaneously. The scan-based procedure can be used to construct a complete hologram by joining together sub-holograms captured using a relatively small, roving scan array and a fixed reference array. For the procedure to be successful, the source levels must remain stationary for the time taken to record the complete hologram: that is unlikely to be the case in practice, however. Usually, the reference signal levels measured during each scan differ from each other with the result that spatial noise is added to the hologram. A non-stationarity compensation procedure that is based on the acoustical transfer functions between the sources and both the reference and scanning, field microphones are invariable is introduced. Numerical and experimental results show well the availability of the introduced procedures to suppress the spatially distributed noise and to get better sound fields partially separated.
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24

Dieing, T., U. Schmidt, and S. Breuninger. "Nearfield-Raman – Imaging beyond the diffraction limit." Nanoindustry Russia, no. 6 (2015): 30–33. http://dx.doi.org/10.22184/1993-8578.2015.60.6.30.33.

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25

Radmacher, M., P. E. Hillner, and P. K. Hansma. "Scanning nearfield optical microscope using microfabricated probes." Review of Scientific Instruments 65, no. 8 (August 1994): 2737–38. http://dx.doi.org/10.1063/1.1144610.

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26

Zechmann, Edward, and J. Adin Mann. "Extending nearfield acoustical holography past intermediate sources." Journal of the Acoustical Society of America 109, no. 5 (May 2001): 2363. http://dx.doi.org/10.1121/1.4744313.

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27

Kim, Yong‐joe, Moohyung Lee, and J. Stuart Bolton. "Multi‐reference methods for nearfield acoustical holography." Journal of the Acoustical Society of America 129, no. 4 (April 2011): 2491. http://dx.doi.org/10.1121/1.3588219.

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28

Williams, Earl G. "Current advances in cylindrical nearfield acoustical holography." Journal of the Acoustical Society of America 84, S1 (November 1988): S171—S172. http://dx.doi.org/10.1121/1.2025966.

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29

Maynard, J. D. "Nearfield acoustical holography and nonlinear sound fields." Journal of the Acoustical Society of America 121, no. 5 (May 2007): 3069. http://dx.doi.org/10.1121/1.4781862.

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30

Collins, Michael D. "A nearfield asymptotic analysis for underwater acoustics." Journal of the Acoustical Society of America 85, no. 3 (March 1989): 1107–14. http://dx.doi.org/10.1121/1.397495.

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31

Williams, Earl G., Brian H. Houston, and Joseph A. Bucaro. "Broadband nearfield acoustical holography for vibrating cylinders." Journal of the Acoustical Society of America 86, no. 2 (August 1989): 674–79. http://dx.doi.org/10.1121/1.398245.

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32

Wang, Yuan, Werayut Srituravanich, Cheng Sun, and Xiang Zhang. "Plasmonic Nearfield Scanning Probe with High Transmission." Nano Letters 8, no. 9 (September 10, 2008): 3041–45. http://dx.doi.org/10.1021/nl8023824.

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33

Ramapriya, Deepthee Madenoor, Gabriele Gradoni, Stephen C. Creagh, Gregor Tanner, Elise Moers, and Inés Lopéz Arteaga. "Nearfield acoustical holography – a Wigner function approach." Journal of Sound and Vibration 486 (November 2020): 115593. http://dx.doi.org/10.1016/j.jsv.2020.115593.

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34

Ko, Byeongsik. "Enhancing nearfield acoustic holography using wavelet transform." KSME International Journal 18, no. 10 (October 2004): 1738–46. http://dx.doi.org/10.1007/bf02984322.

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35

Kuntz, Herbert L. "Radiated sound and the geometric nearfield size." Noise Control Engineering Journal 56, no. 4 (2008): 269. http://dx.doi.org/10.3397/1.2949927.

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36

Borgiotti, Giorgio V., and Eric Rosen. "Farfield projection from sparse nearfield measurement samples." Journal of the Acoustical Society of America 86, S1 (November 1989): S117—S118. http://dx.doi.org/10.1121/1.2027327.

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37

Laissus, J. J., B. Laulagnet, and J. L. Guyader. "Nearfield acoustic radiation from stiffened cylindrical shells." Journal of the Acoustical Society of America 87, S1 (May 1990): S50. http://dx.doi.org/10.1121/1.2028254.

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38

Ferlino, Philip A., and W. Jack Hughes. "Nearfield calibration array for hydrophones and arrays." Journal of the Acoustical Society of America 87, S1 (May 1990): S95. http://dx.doi.org/10.1121/1.2028442.

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39

Zhao, Xiang. "Energetically optimal regularization in nearfield acoustical holography." Journal of the Acoustical Society of America 117, no. 4 (April 2005): 2546. http://dx.doi.org/10.1121/1.4809411.

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40

Bonamy, C., P. Jordan, and Y. Gervais. "Tailored nearfield Green’s functions for arbitrary geometries." Journal of the Acoustical Society of America 128, no. 5 (November 2010): 2581–88. http://dx.doi.org/10.1121/1.3365240.

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41

NAGAMATSU, Masao. "Development of Double Nearfield Acoustic Holography Method." Proceedings of the Dynamics & Design Conference 2017 (2017): 423. http://dx.doi.org/10.1299/jsmedmc.2017.423.

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42

Kolb, Emanuel. "The Schwan/Artin coordinatization for nearfield planes." Geometriae Dedicata 50, no. 3 (May 1994): 283–90. http://dx.doi.org/10.1007/bf01267870.

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43

Zhang, Xin. "Aircraft noise and its nearfield propagation computations." Acta Mechanica Sinica 28, no. 4 (August 2012): 960–77. http://dx.doi.org/10.1007/s10409-012-0136-1.

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44

Bi, Chuanxing, Xinzhao Chen, Rong Zhou, and Jian Chen. "Landweber iterative regularization for nearfield acoustic holography." Chinese Science Bulletin 51, no. 11 (June 2006): 1374–80. http://dx.doi.org/10.1007/s11434-006-1374-z.

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45

Yao, Hsin-Yu, Dan-Ru Hsiao, and Tsun-Hsu Chang. "Fast, Nondestructive, and Broadband Dielectric Characterization for Polymer Sheets." Polymers 12, no. 9 (August 21, 2020): 1891. http://dx.doi.org/10.3390/polym12091891.

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We propose a compact nearfield scheme for fast and broadband dielectric characterization in the microwave region. An open-type circular probe operated in the high-purity TE01 mode was developed, showing a strongly confined fringing field at the open end. This fringing field directly probed the freestanding sheet sample, and the overall reflection was measured. Without sample-loading processes, both of the system assembling time and the risk of sample damage can be significantly reduced. In addition, the nearfield measurement substantially simplifies the calibration and the retrieval theory, facilitating the development of easy-to-integrate and easy-to-calibrate dielectric characterization technique. The dielectric properties of more than ten polymers were characterized from 30 GHz to 40 GHz. We believe that this work fulfills the requirement of the fast diagnostic in the industrial manufactures and also provides valuable high-frequency dielectric information for the designs of 5G devices.
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46

Gray-Stephens, Angus, Tahsin Tezdogan, and Sandy Day. "Numerical Modelling of the Nearfield Longitudinal Wake Profiles of a High-Speed Prismatic Planing Hull." Journal of Marine Science and Engineering 8, no. 7 (July 14, 2020): 516. http://dx.doi.org/10.3390/jmse8070516.

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This study investigates the level of accuracy with which Computational Fluid Dynamics (CFD) is capable of modelling the nearfield longitudinal wake profiles of a high-speed planing hull. It also looks to establish how various set-ups influence the accuracy, with a specific emphasis on turbulence modelling. It analyses a hull over a broad range of conditions to provide detailed insight into the strengths and limitations of CFD, comparing the numerical results to the experimental results previously generated by the authors. A quantitative comparison is made for the centreline (CL) and quarterbeam (QB) longitudinal wake profile plots. Following this, a qualitative comparison is made between photos of the flow pattern from the experimental testing and free surface elevation plots from CFD. The study concluded that CFD is an accurate and robust method of modelling the nearfield longitudinal wake profiles of a high-speed planning hull.
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47

Krishnappa, G., and J. M. McDougall. "Sound Intensity Distribution and Energy Flow in the Nearfield of a Clamped Circular Plate." Journal of Vibration and Acoustics 111, no. 4 (October 1, 1989): 465–71. http://dx.doi.org/10.1115/1.3269884.

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Sound intensity distribution and energy flow in the nearfield of a clamped circular plate vibrating at its resonant frequencies were investigated. Theoretical calculation of the sound intensity vector was based on Rayleigh’s integral formula and the finite difference approximation of pressures to determine the particle velocity of sound in the fluid medium. The theoretically determined nearfield sound intensity distributions agreed well with the experimental measurements carried out using the two microphone method. Energy lines plotted on radial planes using the method suggested by Waterhouse et al. [3] for the axisymmetric modes of vibration showed the presence of vortex lines close to the nodal lines. The recirculating energy zones appeared to increase with the number of nodal circles, with the farfield radiation predominantly emanating from the center and outer edges of the plate. The theoretical results also revealed the existence of recirculating energy zones for the nonaxisymmetric modes of vibration.
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48

Snyder, Keith. "Using Near Field Equivalent Sources in Combination with Large Element Physical Optics to Model a Slant 45 Degree Omni Directional Antenna over Ground." Applied Computational Electromagnetics Society 35, no. 11 (February 5, 2021): 1362–63. http://dx.doi.org/10.47037/2020.aces.j.351150.

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This paper compares the theoretical and measured antenna patterns of a slant 45-degree antenna on a rolled edge ground plane. Advantages of using sampled nearfield currents in combination with large element physical optics in determining the reflected far fields will be described.
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49

Strong, William Y., and Gordon Ebbitt. "A scanning microphone implementation of nearfield acoustical holography." Journal of the Acoustical Society of America 79, S1 (May 1986): S35. http://dx.doi.org/10.1121/1.2023186.

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50

Kennedy, R. A., T. D. Abhayapala, and D. B. Ward. "Broadband nearfield beamforming using a radial beampattern transformation." IEEE Transactions on Signal Processing 46, no. 8 (1998): 2147–56. http://dx.doi.org/10.1109/78.705426.

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