Relevant bibliographies by topics / Nearfield

Academic literature on the topic 'Nearfield'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "Nearfield"

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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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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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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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "Nearfield"

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Harris, Michael C. "Development of an Energy-Based Nearfield Acoustic Holography System." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd835.pdf.

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Abhayapala, P. Thushara D., and Thushara Abhayapala@anu edu au. "Modal Analysis and Synthesis of Broadband Nearfield Beamforming Arrays." The Australian National University. Telecommunications Engineering Group, 2000. http://thesis.anu.edu.au./public/adt-ANU20010905.121231.

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This thesis considers the design of a beamformer which can enhance desired signals in an environment consisting of broadband nearfield and/or farfield sources. The thesis contains: a formulation of a set of analysis tools which can provide insight into the intrinsic structure of array processing problems; a methodology for nearfield beamforming; theory and design of a general broadband beamformer; and a consideration of a coherent nearfield broadband adaptive beamforming problem. To a lesser extent, the source localization problem and background noise modeling are also treated. ¶: A set of analysis tools called modal analysis techniques which can be used to a solve wider class of array signal processing problems, is first formulated. The solution to the classical wave equation is studied in detail and exploited in order to develop these techniques. ¶: Three novel methods of designing a beamformer having a desired nearfield broadband beampattern are presented. The first method uses the modal analysis techniques to transform the desired nearfield beampattern to an equivalent farfield beampattern. A farfield beamformer is then designed for a transformed farfield beampattern which, if achieved, gives the desired nearfield pattern exactly. The second method establishes an asymptotic equivalence, up to complex conjugation, of two problems: (i) determining the nearfield performance of a farfield beampattern specification, and (ii) determining the equivalent farfield beampattern corresponding to a nearfield beampattern specification. Using this reciprocity relationship a computationally simple nearfield beamforming procedure is developed. The third method uses the modal analysis techniques to find a linear transformation between the array weights required to have the desired beampattern for farfield and nearfield, respectively. ¶: An efficient parameterization for the general broadband beamforming problem is introduced with a single parameter to focus the beamformer to a desired operating radius and another set of parameters to control the actual broadband beampattern shape. This parameterization is derived using the modal analysis techniques and the concept of the theoretical continuous aperture. ¶: A design of an adaptive beamformer to operate in a signal environment consisting of broadband nearfield sources, where some of interfering signals may be correlated with desired signal is also considered. Application of modal analysis techniques to noise modeling and broadband coherent source localization conclude the thesis.
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Terrell, Stephen John. "Design of a bistatic nearfield array for an expanded volume." Thesis, Available online, Georgia Institute of Technology, 2005, 2005. http://etd.gatech.edu/theses/available/etd-03172005-140730/unrestricted/terrell%5Fstephen%5Fj%5F200505%5Fmast.PDF.

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Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2005.
Rogers, Peter, Committee Chair ; Ginsberg, Jerry, Committee Member ; Trivett, David, Committee Member. Includes bibliographical references.
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Möller, Elias [Verfasser]. "Handheld optoacoustic probe facilitating nearfield investigations through a transparent detector / Elias Möller." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2020. http://d-nb.info/1222160412/34.

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Filyayev, Anton A. "Noise Source Evaluation of Misalignment and Elastomeric Couplings using Nearfield Acoustic Holography." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535373234815763.

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Sexton, Robert Christopher. "A nearfield investigation into the sound pressure levels of high speed jet plumes." Thesis, University of Southampton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386665.

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Brandstetter, Matthias [Verfasser], and Markus [Akademischer Betreuer] Lippitz. "Apertureless Scanning Nearfield Optical Microscopy with Ultra-high Temporal Resolution / Matthias Brandstetter. Betreuer: Markus Lippitz." Bayreuth : Universität Bayreuth, 2016. http://d-nb.info/1082289116/34.

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Woolston, Scott R. "Development of methods to propagate energy density and predict farfield directivity using nearfield acoustic holography /." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd3016.pdf.

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Woolston, Scott Richard. "Development of Methods to Propagate Energy Density and Predict Farfield Directivity Using Nearfield Acoustic Holography." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1726.

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Acoustical-based imaging systems have found merit in determining the behavior of vibrating structures. This thesis focuses on the continued development of the nearfield acoustic holography (NAH) approach. Conventional NAH consists of first measuring the pressure field on a two-dimensional conformal surface and then propagating this data back to the vibrating structure to obtain information about the source, such as the normal velocity distribution. Recent work has been done which incorporates particle velocity information into the traditional NAH measurements to reduce the number of measurements required. This advancement has made NAH a more affordable tool for acoustical imaging and sound field characterization. It is proposed that the inclusion of velocity information into traditional NAH can further increase its usefulness. By propagating the velocity and pressure values independently and recombining them on the reconstruction surface, the pressure field and energy density fields can be predicted at any point in the sound field. It is also proposed that the same NAH measurement can be used to predict farfield directivity. The inclusion of velocity values into the NAH technique also provides a means for predicting energy density (ED) anywhere within the acoustic field. These two developments would allow a single NAH measurement to provide much more information about an acoustic source and its radiated sound field. Experimental testing shows that NAH is successful at predicting the shape of the resulting ED field and directivity pattern with some error in amplitude. The best performance of the technique is with a planer source resulting in an average amplitude error of 18.5% over the entire field.
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Wright, Alan James. "Distortion in conformable masks for evanescent near field optical lithography." Thesis, University of Canterbury. Electrical and Computer Engineering, 2007. http://hdl.handle.net/10092/1161.

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In this thesis the in-plane pattern distortion resulting from the use of Evanescent Near Field Optical Lithography (ENFOL) masks was investigated. ENFOL is a high resolution low-cost technique of lithography that is able to pattern features beyond the diffraction limit of light. Due to its use of the evanescent near field, ENFOL requires the use of conformable masks for intimate contact. Such masks can stretch and skew as they come into contact with silicon substrates and therefore distort the high resolution features patterned on them. It was desired to measure this distortion to ascertain the patterning performance of ENFOL masks and possibly correct for any uniform distortion found. To this end a sophisticated measuring process was successfully demonstrated. This involved the use of a Raith 150 Electron Beam Lithography (EBL) system with precision laser interferometer stage and metrology software module for automated measurements. Custom software was written for the Raith to enable it to take additional measurements to compensate for electron beam drift. Processing algorithms were then employed to using the measurements to compensate for beam drift and correcting for shift and rotation systematic errors. The performance of the in-plane distortion measuring process was found to have a precision of 60nm. With the ability to measure distortion, ENFOL masks were used to pattern substrates and distortion was found to be large, on the order of 1µm. This is much larger than desired for sub 100nm patterning as is expected of ENFOL. The distortions were non-uniform patterns of localised displacements. This, the observation of Newton's rings beneath a test mask and the observation of a single particle distortion across measurements of the same mask across different loadings in the EBL pointed to particulate contamination causing the distortion. In order to prove beyond doubt that particulate contamination was the cause of the spurious distortions, mechanical modelling using the Finite Element Method (FEM) of analysis was employed. The results from this matched the distortions observed experimentally, particles 20-40µm modelling the observed distortion.
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Books on the topic "Nearfield"

1

Brown, Lee A. Real time nearfield acoustic holography. Leicester: De Montfort University, 1998.

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Matzumoto, A. E. Perez. Nearfield acoustic holography: Review and perspectives. Southampton, U.K: University of Southampton, Institute of Sound and Vibration Research, 1989.

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Sylvester, Arthur G. Nearfield investigations of crustal movements, southern California: Technical report, final. [Denver, Colo.?]: U.S. Dept. of the Interior, Geological Survey, 1988.

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Kurihara, Takayuki. Observation and Control of Magnetic Order Dynamics by Terahertz Magnetic Nearfield. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-8793-8.

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Kiechle, Hubert, Alexander Kreuzer, and Momme Johs Thomsen, eds. Nearrings and Nearfields. Berlin/Heidelberg: Springer-Verlag, 2005. http://dx.doi.org/10.1007/1-4020-3391-5.

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Saad, Gerhard, and Momme Johs Thomsen, eds. Nearrings, Nearfields and K-Loops. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-009-1481-0.

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Nearrings and nearfields: Proceedings of the Conference on Nearrings and Nearfields, Hamburg, Germany, July 27 - August 3, 2003. Dordrecht: Springer, 2004.

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1960-, Kiechle Hubert, Thomsen Momme Johs, and Kreuzer Alexander, eds. Nearrings and nearfields: Proceedings of the Conference on Nearrings and Nearfields, Hamburg, Germany, July 27-August 3, 2003. Dordrecht: Springer, 2005.

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Saad, Gerhard. Nearrings, Nearfields and K-Loops: Proceedings of the Conference on Nearrings and Nearfields, Hamburg, Germany, July 30-August 6,1995. Dordrecht: Springer Netherlands, 1997.

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Conference on Near-rings and Near-fields (1995 Hamburg, Germany). Nearrings, nearfields, and K-loops: Proceedings of the Conference on Nearrings and Nearfields, Hamburg, Germany, July 30-August 6, 1995. Dordrecht: Kluwer Academic Publishers, 1997.

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Book chapters on the topic "Nearfield"

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Hayek, Sabih I. "Nearfield Acoustical Holography." In Handbook of Signal Processing in Acoustics, 1129–39. New York, NY: Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-30441-0_59.

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Senior, Mike. "Using Nearfield Monitors." In Mixing Secrets for the Small Studio, 3–33. Second edition. | New York, NY : Routledge, 2018. | Series: Sound on Sound presents: Routledge, 2018. http://dx.doi.org/10.4324/9781315150017-2.

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Guethner, P., E. Schreck, K. Dransfeld, and U. Ch Fischer. "Scanning Nearfield Acoustic Microscopy." In Scanning Tunneling Microscopy and Related Methods, 507–14. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-015-7871-4_29.

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Kulik, A., J. Attal, and G. Gremaud. "Nearfield Scanning Acoustic Microscopy." In Acoustical Imaging, 241–44. Boston, MA: Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2958-3_32.

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Bai, M. Robin, and Anna L. Pate. "Velocity-Based Nearfield Acoustic Holography." In Acoustical Imaging, 257–65. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0725-9_25.

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Gleason, S. M., and Anna L. Pate. "Efficient Sampling for Nearfield Acoustic Holography." In Acoustical Imaging, 249–56. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0725-9_24.

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Reibold, R., and P. Kwiek. "Optical Nearfield of Ultrasonic Light Diffraction." In Physical Acoustics, 129–42. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-9573-1_12.

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Kwon, Hyuck Sang. "Multi-Reference Scan-Based Nearfield Acoustical Holography." In Advanced Nondestructive Evaluation I, 1249–52. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-412-x.1249.

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Jin, Jiangming, Huancai Lu, Weijie Hu, Minzhong Li, and Fang Yuan. "Combined Spherical Nearfield Acoustic Holography and Sound Quality Analyses." In Fluid-Structure-Sound Interactions and Control, 277–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40371-2_41.

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Luce, Timothy W., and Sabih I. Hayek. "An Examination of Aperture Effects in Cylindrical Nearfield Holography." In Acoustical Imaging, 267–76. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0725-9_26.

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Conference papers on the topic "Nearfield"

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Frazer, Tony, and Jorgen Hald. "Nearfield Acoustic Holography in the Not-so-Nearfield." In SAE Brasil International Noise and Vibration Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2010. http://dx.doi.org/10.4271/2010-36-0555.

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Wang, Yifei, Jian Fang, An Li, Qi Yang, and William Shieh. "Nearfield Complex Imaging." In Optical Fiber Communication Conference. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/ofc.2017.th4h.4.

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Hoffmann, Johannes. "Nearfield scanning microwave microscopes." In 2014 Conference on Precision Electromagnetic Measurements (CPEM 2014). IEEE, 2014. http://dx.doi.org/10.1109/cpem.2014.6898337.

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Venot, Y., and W. Wiesbeck. "Nearfield Millimetrewave Sensor Processing." In 32nd European Microwave Conference, 2002. IEEE, 2002. http://dx.doi.org/10.1109/euma.2002.339272.

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Novotny, L., A. Bouhelier, A. Hartschuh, M. R. Beversluis, J. Zurita-Sanchez, and N. Anderson. "Nearfield optical interactions and spectroscopy." In Frontiers in Optics. Washington, D.C.: OSA, 2004. http://dx.doi.org/10.1364/fio.2004.fmp2.

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Fisher, Etan, and Boaz Rafaely. "The nearfield spherical microphone array." In ICASSP 2008 - 2008 IEEE International Conference on Acoustics, Speech and Signal Processing. IEEE, 2008. http://dx.doi.org/10.1109/icassp.2008.4518849.

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Wang, Yuan, Werayut Srituravanich, Cheng Sun, and Xiang Zhang. "Plasmonic nearfield scanning optical microscopy." In SPIE Optics + Photonics, edited by Satoshi Kawata, Vladimir M. Shalaev, and Din Ping Tsai. SPIE, 2006. http://dx.doi.org/10.1117/12.681482.

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Tabassum, Muhammad Naveed, Ibrahim Elshafiey, and Mubashir Alam. "Innovative nearfield electromagnetic imaging system." In 2014 IEEE International Conference on Smart Instrumentation, Measurement and Applications (ICSIMA). IEEE, 2014. http://dx.doi.org/10.1109/icsima.2014.7047428.

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Bouloumis, Theodoros D., Xue Han, Domna Kotsifaki, Viet Giang Truong, and Síle Nic Chormaic. "Trapping nanoparticles with nearfield plasmonic tweezers." In Frontiers in Optics. Washington, D.C.: OSA, 2019. http://dx.doi.org/10.1364/fio.2019.fm4f.2.

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Tabassum, Muhammad Naveed, Ibrahim Elshafiey, and Mubashir Alam. "Compressed sensing based nearfield electromagnetic imaging." In 2014 IEEE International Conference on Control System, Computing and Engineering (ICCSCE). IEEE, 2014. http://dx.doi.org/10.1109/iccsce.2014.7072783.

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Reports on the topic "Nearfield"

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Broder, Bruce. Nearfield Detection of a Crossing Target in Clutter. Fort Belvoir, VA: Defense Technical Information Center, November 1987. http://dx.doi.org/10.21236/ada188227.

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Barnett, S. J. Multiple-Channel Equalization of a Nearfield Sonar System. Fort Belvoir, VA: Defense Technical Information Center, February 1994. http://dx.doi.org/10.21236/ada276711.

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Clayton, Daniel James, and Nathan E. Bixler. Assessment of the MACCS Code Applicability for Nearfield Consequence Analysis. Office of Scientific and Technical Information (OSTI), February 2020. http://dx.doi.org/10.2172/1604262.

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Obara, Michael D., and Theodore R. Anderson. Model for Nearfield Electromagnetic Shielding by Cylindrical Shells of Composite Materials. Fort Belvoir, VA: Defense Technical Information Center, October 1996. http://dx.doi.org/10.21236/ada324048.

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Clayton, Daniel. Implementation of Additional Models into the MACCS Code for Nearfield Consequence Analysis. Office of Scientific and Technical Information (OSTI), June 2021. http://dx.doi.org/10.2172/1821539.

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Malej, Matt, and Fengyan Shi. Suppressing the pressure-source instability in modeling deep-draft vessels with low under-keel clearance in FUNWAVE-TVD. Engineer Research and Development Center (U.S.), May 2021. http://dx.doi.org/10.21079/11681/40639.

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This Coastal and Hydraulics Engineering Technical Note (CHETN) documents the development through verification and validation of three instability-suppressing mechanisms in FUNWAVE-TVD, a Boussinesq-type numerical wave model, when modeling deep-draft vessels with a low under-keel clearance (UKC). Many large commercial ports and channels (e.g., Houston Ship Channel, Galveston, US Army Corps of Engineers [USACE]) are traveled and affected by tens of thousands of commercial vessel passages per year. In a series of recent projects undertaken for the Galveston District (USACE), it was discovered that when deep-draft vessels are modeled using pressure-source mechanisms, they can suffer from model instabilities when low UKC is employed (e.g., vessel draft of 12 m¹ in a channel of 15 m or less of depth), rendering a simulation unstable and obsolete. As an increasingly large number of deep-draft vessels are put into service, this problem is becoming more severe. This presents an operational challenge when modeling large container-type vessels in busy shipping channels, as these often will come as close as 1 m to the bottom of the channel, or even touch the bottom. This behavior would subsequently exhibit a numerical discontinuity in a given model and could severely limit the sample size of modeled vessels. This CHETN outlines a robust approach to suppressing such instability without compromising the integrity of the far-field vessel wave/wake solution. The three methods developed in this study aim to suppress high-frequency spikes generated nearfield of a vessel. They are a shock-capturing method, a friction method, and a viscosity method, respectively. The tests show that the combined shock-capturing and friction method is the most effective method to suppress the local high-frequency noises, while not affecting the far-field solution. A strong test, in which the target draft is larger than the channel depth, shows that there are no high-frequency noises generated in the case of ship squat as long as the shock-capturing method is used.
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