Relevant bibliographies by topics / Directivity

Academic literature on the topic 'Directivity'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 April 2023

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Journal articles on the topic "Directivity"

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Nakazawa, Toshiyasu, and Naoaki Shinohara. "Study on aircraft noise directivity of behind the start of takeoff roll." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 3 (August 1, 2021): 3202–8. http://dx.doi.org/10.3397/in-2021-2330.

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This paper discusses aircraft noise directivity behind the start of takeoff roll. Aircraft noise has the radiation directivity because of aircraft engine mount position and the engine noise directivity. Thus, lateral noise directivity correction is recommended in airport noise calculation guidelines such as ECAC Doc.29 and ICAO Doc9911. In these guidelines, the directivity of flyover noise and the directivity at the start of takeoff roll on ground are prepared separately. A 90-degree dipole model is used for the directivity of the flyover noise, and another similar directivity is used for the directivity behind the start of takeoff roll. It is necessary to properly evaluate the directivity behind the takeoff roll because it has a large contribution to noise calculation of the vicinity of the airport. Therefore, we measured aircraft noise behind the start of takeoff roll with sound level meters placed half-concentrically around Narita Airport in Japan. From these measurement results, various types of aircraft noise directivity behind the takeoff roll are examined and considered the effects of weather conditions such as wind direction. Finally the differences from existing models are compared.
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O'Donoghue, Jennifer L., and Karen R. Strobel. "Directivity and Freedom." American Behavioral Scientist 51, no. 3 (November 2007): 465–85. http://dx.doi.org/10.1177/0002764207306071.

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Dittberner, Andrew B. "Quantifying microphone directivity." Hearing Journal 56, no. 11 (November 2003): 22. http://dx.doi.org/10.1097/01.hj.0000292901.09293.7b.

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Jers, Harald. "Directivity of singers." Journal of the Acoustical Society of America 118, no. 3 (September 2005): 2008. http://dx.doi.org/10.1121/1.4785700.

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Johnston, James David. "Perceptual speaker directivity." Journal of the Acoustical Society of America 120, no. 4 (2006): 1763. http://dx.doi.org/10.1121/1.2372346.

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Zhao, Guozhu, Kaibo Shi, and Shouming Zhong. "Research on Array Structures of Acoustic Directional Transducer." Mathematical Problems in Engineering 2021 (January 2, 2021): 1–5. http://dx.doi.org/10.1155/2021/6670277.

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This paper focuses on the directivity design of array structures of acoustic directional transducers. Based on Huygens principles, the directivity formula of transducer arrays under random distribution in xyz space is derived when the circular piston transducers are used as the array element, which is used to analyze the directivity and acoustic pressure of conical transducer arrangements. In addition, a practical approach to analyze the directivity and acoustic pressure of transducer arrays under random arrangements is proposed. Findings. The conical transducer arrays show side lobes at higher frequency. Below the frequency of 2 kHz, array directivity shows rapid changes. Above the frequency of 2 kHz, array directivity varies slowly with frequency. Besides, the beam width is Θ − 3 dB ≤ 29.85 ° .
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Musset, S., M. Maksimovic, E. Kontar, V. Krupar, N. Chrysaphi, X. Bonnin, A. Vecchio, et al. "Simulations of radio-wave anisotropic scattering to interpret type III radio burst data from Solar Orbiter, Parker Solar Probe, STEREO, and Wind." Astronomy & Astrophysics 656 (December 2021): A34. http://dx.doi.org/10.1051/0004-6361/202140998.

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Aims. We use multi-spacecraft observations of individual type III radio bursts to calculate the directivity of the radio emission. We compare these data to the results of ray-tracing simulations of the radio-wave propagation and probe the plasma properties of the inner heliosphere. Methods. We used ray-tracing simulations of radio-wave propagation with anisotropic scattering on density inhomogeneities to study the directivity of radio emissions. Simultaneous observations of type III radio bursts by four widely separated spacecraft were used to calculate the directivity and position of the radio sources. The shape of the directivity pattern deduced for individual events is compared to the directivity pattern resulting from the ray-tracing simulations. Results. We show that simultaneous observations of type radio III bursts by four different probes provide an opportunity to estimate the radio source positions and the directivity of the radio emission. The shape of the directivity varies from one event to another and it is consistent with anisotropic scattering of the radio waves.
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Liu, Hong, and Guo Zhu Zhao. "Two Methods to Test Transducer Array Directivity." Advanced Materials Research 912-914 (April 2014): 1485–88. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.1485.

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An array which possess more array element number and whose frequency of the drive signal can be as large as possible in a range, directivity will be more preferable. On the other hand, when the structure of the sound radiating surface of the transducer or array layout is symmetrical, the corresponding directivity pattern will be symmetrical. In order to test transducer directivity, two methods are designed. The one is to measure the ultrasonic sound pressure level by instruments. The sound pressure level is measured at multiple points to deduce the directivity angle of the acoustic transducer array. The beam width of the 3×3 array is about at 23kHz, and the directivity acute angle is about 10°; higher frequencies will lead to the side lobes, but it can be negligible when compared to the main lobe. The other method is using the frequency analyzer to test transducer directivity in a silencer chamber. The sound pressure level can be read out from frequency response diagrams. The angle between the sound pressure value that decreasing 3db from the max value 111.7db and the max value is about 11°. So the directivity acute angle is about 11°. It should be noticed that, as the directivity diagram can not be directly attributed, there is some deviation in the conclusion.
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Zhao, Guo Zhu, and Li Xuan Ma. "Research on the High-Power Directional Acoustic Transducer." Advanced Materials Research 912-914 (April 2014): 753–56. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.753.

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Through studying how to affect acoustic directivity with MATLAB software, it show that selection of a relatively larger surface of the transducer and a relatively closer transducer interval will be more preferable for directivity. While an array which possess more array element number and whose frequency of the drive signal can be as large as possible in a range, directivity will be more preferable. On the other hand, when the structure of the sound radiating surface of the transducer or array layout is symmetrical, the corresponding directivity pattern will be symmetrical. At a frequency of 10kHz, the individual rare earth magnetostrictive transducers its first point of the simulation carried out before the test. Sounding board with aluminum by the method used to improve the sound source diameter. With the sound plate diameter incrementing, the smaller the angle of the directivity. The beam width of the 3×3 array is about at 23kHz, and the directivity acute angle is about 10°, with a sounding board by the method used to improve their the diameter of the sound source, so as to realize the sound has directivity is feasible.
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Bellows, Samuel D., and Timothy W. Leishman. "Modeling musician diffraction for artificially excited clarinet directivity measurements." Journal of the Acoustical Society of America 151, no. 4 (April 2022): A157. http://dx.doi.org/10.1121/10.0010960.

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Directivity measurements of musical instruments have many applications in musical, audio, and architectural acoustics. Typical measurement methods include artificially excited instruments and instruments played by live musicians. While recent advances in directivity measurement techniques enable higher resolutions for played instruments, the results are still limited in bandwidth and repeatability compared with directivity results from artificially excited instruments. However, artificially excited instruments typically neglect musician diffraction and absorption. This work compares possible approaches for representing musician diffraction in artificially excited clarinet measurements to improve their directivity results for room simulations or auralizations.
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Dissertations / Theses on the topic "Directivity"

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Basta, Nina Popovic. "Multilayer scalable coupler with high directivity." Thesis, Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/53955.

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This thesis addresses the design, analysis, and experimental validation of a high-directivity and high coupling microwave directional coupler. The motivating application is in broadband signal routing between cores of multi-core processors, where the delay of simple wire interconnects introduces unacceptable latency. The performance goals include scalability with frequency, a coupling coefficient of 3 dB, directivity larger than 40 dB, high return loss, low insertion loss below 3 dB at the center frequency, and small footprint. The approach to this problem taken in the thesis is a combination of edge and broad-side coupling in a multi-layer, multi-conductor microstrip coupled-line system. The two coupling mechanisms between neighboring pairs of coupled lines, along with appropriate end interconnections, allow for reduced size and design that achieves equal propagation velocities for the different modes supported by the five-conductor guiding structure that contribute to coupling. To validate the approach, a coupler designed for operation at 1 GHz is demonstrated to have a isolation of -22 dB with a coupling coefficient of 3\,dB and a return loss of -20 dB. The coupler is implemented on a FR-408 substrate with a permittivity of 3.66 and 1.17mm and 0.17mm thicknesses, and a total area of 12.65 cm^2. Three metalization layers are used in the design, with edge and broad-side coupled pairs of lines on the top two layers and diagonal end interconnects between the top and bottom lines. The coupler design is then scaled to 3 GHz by shortening the coupled-line length, and established -24 dB isolation, coupling of 3 dB, return loss of -20 dB, and has a total area of 6.9 cm^2. The analysis of the coupler shows that full-wave electromagnetic modeling agrees well with measurements and is necessary during the design process, while circuit analysis with built-in coupled-line models shows poorer agreement with experimental data. A tolerance analysis shows that the coupler performance is most sensitive to milling precision and separation between coupled-lines. Based on the measured and simulated results, it is shown that this type of coupler can be further scaled to higher frequencies and on-chip implementations for signal distribution in multi-core processors, or any other application where a number of components need to be interconnected with low latency and no reflection.
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Loveridge, M. M. "Marine seismic source signatures : directivity and the ghost." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355760.

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Ivars, Morón Diego. "Optimizing the directivity index of a two-way loudspeaker." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11108.

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Performance of the loudspeaker in a common living room is analyzed in this project. Moreover, directivity parameters like Directivity Index and polar Directivity Diagram are studied taking as example one specific tweeter construction. Some writers suggest that largely frequency-independent Directivity Index is preferable for loudspeakers in an ordinary indoor stereo setup. To achieve this goal, variation of the original radiation diagram of the studied tweeter is performed including reflectors in the system. A measurement protocol is designed and used. Obtained data is processed by developed software that presents the results.
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Foltz, Eleanor R. (Eleanor Ruth). "Two dimensional control of metamaterial parameters for radiation directivity." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37199.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.
Includes bibliographical references (leaves 77-80).
This work examines the feasibility of using metamaterials to direct radiation. The limits of required index of refraction and the required material depth are explored using MATLAB simulations. A wedge of connected S-shape metamaterial is chosen and simulated in CST Microwave Studio. The incident radiation is Transverse Magnetic (TM) and negative deflection is achieved. The S-shape wedge is adjusted in small ways, and a specific wedge is chosen for further study. The S-shape metamaterial wedge is then adjusted by adding lumped elements of capacitance throughout the structure. A beam through this adjustable material is deflected -76° to +580 by adding 0pF to 6pF additional capacitance. The deflection is not monotonic, but most pronounced between 0.lpF and 0.8pF. The deflection is discussed, as well as the regions of strongest signal power.
by Eleanor R. Foltz.
M.Eng.
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Sviridova, T. V. "The development to ecological directivity of the operation enterprise." Thesis, Вид-во СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/13191.

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Wang, Zhiwei, and Shen Zhang. "Design of 5G antenna arrays based on Multi-directivity." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-95135.

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As communication technology evolves, the focus shifts to 5G. The discussion of 5G cannot be separated from a discussion of related antenna systems. Chapter 1 is a brief introduction to our work, which is an antenna array for a 5G communication system operating in the band 3.4 to 3.8 GHz. This is a common band for 5G in Europe. Background and theory are presented in Chapters 2 and 3. In Chapter 4, the design has been simulated with the software CST Studio Suite. We study an antenna group that consists of four linear arrays that together cover all directions. The gain eventually reaches 12dB in each of the main directions after optimization. Based on simulation, this gain could be implemented as described in Chapter 5. The specification requires that the antenna should have four main directions with high directivity and a reasonable performance elsewhere. The realized gain is 11 dB for the four main directions. Our data shows that the arrays have two different work modes depending on feeding: one as a directive antenna with 11 dB gain, the other as an omnidirectional antenna with 7.5 dB gain. High directivity is very important for 5G communication. A summary with conclusions is given in Chapter 6 where also some improvements are suggested.
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Juyal, Prateek. "Directive microstrip disc radiators based on TM1m modes." IEEE TAP, 2016. http://hdl.handle.net/1993/32074.

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Fundamental TM11 mode of circular microstrip antennas has a limitation of low broadside gain. This thesis explores and investigates the possibility of designing high gain circular microstrip antennas by using higher zeros of the first order mode, or the TM1m modes. Deficiencies in the existing methods of gain enhancement, motivates the need to look for new methods. This is done by first investigating the radiation characteristics of TM1m modes, and then providing techniques for sidelobe suppression in their radiation patterns. Several approaches are proposed and corresponding to each developed technique, an example of high gain antenna is designed, fabricated and experimentally evaluated. First, through the radiation characteristics of a magnetic loop over an infinite ground plane, we explain the occurrence of high sidelobes in the E-plane radiation patterns of the TM1m modes. By noting the peak directivity and sidelobe variation with loop size, we propose, investigate and demonstrate the use of high permittivity substrates to reduce the sidelobes in the TM12 mode. Second, to remove the dependence of the radiation characteristics on high permittivity substrates, another technique to suppress the high sidelobes of TM12 mode, is presented. It is found that introducing a narrow nonresonant rectangular slot at the patch center, sidelobes of the TM12 mode can be effectively suppressed. Sidelobe level (SLL) suppression is demonstrated by both simulation and measurement, using various configurations. Third, it is proposed that linearly superimposing the radiation fields of either odd or even zeros of the first order mode, can achieve both high gain and low sidelobes. To show this, stacked antenna configurations of TM11 and TM13 modes are thoroughly investigated and SLL suppression is demonstrated. Finally, to leverage further advantage of the linear superposition of modes, a single layer annular slot loaded antenna configuration is proposed. The proposed new configurations are based on higher order TM1m modes, which, for excitation, requires electrically large conducting discs. This property offers one more advantage at high frequencies, where antenna size becomes too small for the fundamental mode to fabricate and feed. The proposed electrically large antennas eliminate these problems, and become more practical to fabricate.
February 2017
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Larsson, Kristina. "Assessment of directivity of real noise sources- Application to vehicles." Thesis, KTH, Farkost och flyg, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-151025.

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The aim of this project is to evaluate a new method for noise directivity measurements; whether a room correction factor can be used to compensate for the effect of a light reverberation field. Another aim is to find if there is any suitable standard to use. No standard to use fully was found, but SS-EN ISO 3744:2010 has a method to compensate for reverberation upon which the present method is based. Measurements were performed for three objects in a semi anechoic room and two ordinary rooms. Sound pressure was measured for all multiples of 30° in the horizontal plane where the acoustic centre for each object was situated. Thereafter, the room correction factor was calculated and from that compensated values could be found. The room correction factor did not fully make the wanted difference. The results only showed subtle connections, but tendencies show that the method might be valid for 250 and 500 Hz. To get a stronger correlation, the method must be refined. The distance to the microphone is for example one factor that depends on the environment.
Målet med projektet är att utvärdera en ny metod för ljuddirektivitetsmätningar; om en rumskorrektionsfaktor kan användas för att kompensera för ett svagt efterklangsfält. Utöver detta görs en litteraturstudie för att finna relevanta standarder. Någon standard att använda helt fanns inte, men SS-EN ISO 3744:2010 har en metod för att kompensera för efterklangsfält som metoden i detta arbete är baserad på. Mätningar utfördes för tre objekt i ett halvekofritt rum och två mer vanligt förekommande omgivningar i en industriell miljö. Där mättes ljudtryck i alla vinklar som är en multipel av 30° i samma horisontella plan där den akustiska mitten i mätobjektet befann sig. Utifrån dessa mätningar kunde rumskorrektionsfaktorn beräknas och från den kunde kompenserade värden hittas. Resultaten visade att rumskorrektionsfaktorn inte fungerade helt önskvärt. De visade bara svaga kopplingar med vissa tendenser till att metoden fungerade bättre för 250 och 500 Hz. Nya mätningar måste därför utföras där metoden förbättrats. Exempelvis är avståndet till mikrofonen, som beror av omgivningen, viktigt.
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Friman, Manne. "Directivity of sound from wind turbines : A study on the horizontal sound radiation pattern from a wind turbine." Thesis, KTH, MWL Marcus Wallenberg Laboratoriet, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-48926.

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In the present paper, a study on the directivity of sound from a wind turbine has been conducted. The aim of the study is to investigate the horizontal sound radiation pattern through a field study compared to a noise prediction. The benefit of the results may be used to optimize the output effect from the wind turbine while the guidelines for noise levels at nearby residential areas still are met. The complete directivity pattern around the wind turbine was investigated by performing emission measurements around the wind turbine from a method described in IEC 61400-11 Wind turbine generator systems – Part 11: Acoustic noise measurement technique. Furthermore, the dominant sound source from the wind turbine, the turbulent boundary layer trailing edge noise, and the frequency range where it is dominating has also been scrutinized. The results show that the dipole character of the trailing edge noise has an impact on the entire horizontal radiation pattern from the wind turbine. From a field study it was found that there was a distinguishable directivity of the sound. On a distance of 125 m from the wind turbine the sound pressure level in the crosswind direction of the wind turbine is close to 3 dBA less than the sound pressure level in the downwind direction of the wind turbine when the wind speed is 8 m/s at a height of 10 m. The difference between other directions compared to the downwind direction is less significant. This could be utilized to optimize the power output, however the difference in sound level is relatively small but the advantage for power output have to be quantified before a conclusion of the benefits can be made.
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Bonvalot, Eliot. "Dynamic response of bridges to near-fault, forward directivity ground motions." Online access for everyone, 2006. http://www.dissertations.wsu.edu/Thesis/Summer2006/e%5Fbonvalot%5F072606.pdf.

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Books on the topic "Directivity"

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Schomer, Paul. Acoustic directivity patterns for Army weapons. Champaign, Ill: US Army Corps of Engineers, Construction Engineering Research Laboratory, 1985.

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Schomer, Paul. Acoustic directivity patterns for Army weapons. Champaign, Ill: US Army Corps of Engineers, Construction Engineering Research Laboratory, 1986.

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Svilainis, Linas. LED video display pixel intensity and directivity investigation: Monograph. Kaunas: Technologija, 2009.

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Svilainis, Linas. LED video display pixel intensity and directivity investigation: Monograph. Kaunas: Technologija, 2009.

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United States. National Aeronautics and Space Administration. Scientific and Technical Information Division. and United States. Army Aviation Systems Command., eds. Measurement resolution of noise directivity patterns from acoustic flight tests. [Washington, D.C.]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1989.

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Martin, R. M. Wake geometry effects on rotor blade-vortex interaction noise directivity. Hampton, Va: Langley Research Center, 1990.

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Grimm, Simon. Directivity Based Multichannel Audio Signal Processing For Microphones in Noisy Acoustic Environments. Wiesbaden: Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-25152-9.

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L, Gentry Carl, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., eds. Directivity and trends of noise generated by a propeller in a wake. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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United States. National Aeronautics and Space Administration., ed. A search for energetic ion directivity in large solar flares: Final technical report. Washington, D.C: National Aeronautics and Space Administration, 1993.

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1956-, Martin R. M., and United States. National Aeronautics and Space Administration. Scientific and Technical Information Division., eds. Advancing-side directivity and retreating-side interactions of model rotor blade-vortex interaction noise. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Division, 1988.

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Book chapters on the topic "Directivity"

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Weik, Martin H. "directivity pattern." In Computer Science and Communications Dictionary, 421. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_5158.

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Eargle, John M. "Relationship Between Directivity Factor and Directivity Index." In Electroacoustical Reference Data, 60–61. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2027-6_30.

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Ward, Darren B., Rodney A. Kennedy, and Robert C. Williamson. "Constant Directivity Beamforming." In Digital Signal Processing, 3–17. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04619-7_1.

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Parkes, Gregg, and Les Hatton. "Source Arrays and Directivity." In The Marine Seismic Source, 23–41. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-017-3385-4_2.

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Bag, Ankan, Martin Neugebauer, Pawel Woźniak, Gerd Leuchs, and Peter Banzer. "Directivity Based Nanoscopic Position Sensing." In NATO Science for Peace and Security Series B: Physics and Biophysics, 487–88. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-0850-8_44.

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Greening, Michael V., Pierre Zakarauskas, and Ronald I. Verrall. "Vertical Directivity Measurements of Ice Cracking." In Natural Physical Sources of Underwater Sound, 553–62. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_41.

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Piotto, Massimo, Federico Butti, and Paolo Bruschi. "Acoustic Velocity Sensors with Programmable Directivity." In Lecture Notes in Electrical Engineering, 271–75. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-3860-1_48.

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Eargle, John M. "Directivity Versus Horizontal and Vertical Beamwidth." In Electroacoustical Reference Data, 122–23. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2027-6_60.

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Nantes Button, Vera L. S., Hayram Nicacio, Joaquim M. Maia, Eduardo T. Costa, and Sidney Leeman. "Directivity Spectrum of an Apodized Ultrasound Transducer." In Acoustical Imaging, 413–18. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/978-1-4419-8606-1_52.

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Huang, Songling, Yu Zhang, Zheng Wei, Shen Wang, and Hongyu Sun. "Directivity and Controllability of Electromagnetic Ultrasonic Transducer." In Theory and Methodology of Electromagnetic Ultrasonic Guided Wave Imaging, 31–151. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8602-2_2.

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Conference papers on the topic "Directivity"

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Tian, Xi, Wenlong Bai, and Tianyiyi He. "A symmetric directivity coupler With broad band and improved directivit." In 2015 16th International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2015. http://dx.doi.org/10.1109/icept.2015.7236849.

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Levin, Boris. "Directivity of thin antennas." In 2016 XXIst International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED). IEEE, 2016. http://dx.doi.org/10.1109/diped.2016.7772224.

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Golaszewski, Arkadiusz, and Adam Abramowicz. "Miniature high directivity couplers." In 2018 22nd International Microwave and Radar Conference (MIKON). IEEE, 2018. http://dx.doi.org/10.23919/mikon.2018.8405198.

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Golaszewski, Arkadiusz, and Adam Abramowicz. "High directivity microstrip couplers." In 2016 21st International Conference on Microwave, Radar and Wireless Communications (MIKON). IEEE, 2016. http://dx.doi.org/10.1109/mikon.2016.7491959.

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Zhao, Guozhu. "Directivity of Transducer Array." In 2nd International Conference on Intelligent Manufacturing and Materials. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0007532704060410.

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Nix, John, and Richard C. Lind. "Directivity Functions during Aircraft Maneuvering." In AIAA Scitech 2020 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-0754.

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Leeman, Sidney, Andrew J. Healey, Eduardo T. Costa, Hayram Nicacio, Ricardo G. Dantas, and Joaquim M. Maia. "Measurement of transducer directivity function." In Medical Imaging 2001, edited by Michael F. Insana and K. Kirk Shung. SPIE, 2001. http://dx.doi.org/10.1117/12.428234.

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Nielsen, Sara, Lars Bo Larsen, Kashmiri Stec, and Adèle Simon. "Mental Models of Loudspeaker Directivity." In AM'19: Audio Mostly. New York, NY, USA: ACM, 2019. http://dx.doi.org/10.1145/3356590.3356633.

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Bulgakova, Anna A., and Nikolay N. Gorobets. "Directivity of small antenna arrays." In 2016 8th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS). IEEE, 2016. http://dx.doi.org/10.1109/uwbusis.2016.7724196.

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Sorkin, Oz, Eldad Holdengreber, Moshe Averbukh, Shmuel E. Schacham, and Eliyahu Farber. "Directivity Enhancement of Tight Couplers." In 2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS). IEEE, 2019. http://dx.doi.org/10.1109/comcas44984.2019.8958089.

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Reports on the topic "Directivity"

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MacFarlane, Eric R., and Richard C. Lee. Los Alamos Seismic Rupture Directivity Study of PF-4. Office of Scientific and Technical Information (OSTI), April 2013. http://dx.doi.org/10.2172/1072251.

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Nuttall, Albert H., and Benjamin A. Cray. Approximations to Directivity for Linear, Planar, and Volumetric Apertures and Arrays. Fort Belvoir, VA: Defense Technical Information Center, July 1997. http://dx.doi.org/10.21236/ada330212.

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Hull, Andrew J. User Manual for the Generic Directivity Index (GenDI) Program (Version 1.0.5). Fort Belvoir, VA: Defense Technical Information Center, August 2001. http://dx.doi.org/10.21236/ada390344.

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Schomer, Paul D. Acoustic Directivity Patterns for Army Weapons. Supplement 4. The Multiple Launch Rocket System. Fort Belvoir, VA: Defense Technical Information Center, February 1986. http://dx.doi.org/10.21236/ada166490.

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Kodres, C. A., and T. W. Lancey. TCNOISE: A Computer Program to Calculate Noise Levels and Directivity from a Jet Engine Test Cell. Fort Belvoir, VA: Defense Technical Information Center, October 1997. http://dx.doi.org/10.21236/ada336321.

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Hart, Carl R., and Gregory W. Lyons. A Measurement System for the Study of Nonlinear Propagation Through Arrays of Scatterers. Engineer Research and Development Center (U.S.), November 2020. http://dx.doi.org/10.21079/11681/38621.

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Various experimental challenges exist in measuring the spatial and temporal field of a nonlinear acoustic pulse propagating through an array of scatterers. Probe interference and undesirable high-frequency response plague typical approaches with acoustic microphones, which are also limited to resolving the pressure field at a single position. Measurements made with optical methods do not have such drawbacks, and schlieren measurements are particularly well suited to measuring both the spatial and temporal evolution of nonlinear pulse propagation in an array of scatterers. Herein, a measurement system is described based on a z-type schlieren setup, which is suitable for measuring axisymmetric phenomena and visualizing weak shock propagation. In order to reduce directivity and initiate nearly spherically-symmetric propagation, laser induced breakdown serves as the source for the nonlinear pulse. A key component of the schlieren system is a standard schliere, which allows quantitative schlieren measurements to be performed. Sizing of the standard schliere is aided by generating estimates of the expected light refraction from the nonlinear pulse, by way of the forward Abel transform. Finally, considerations for experimental sequencing, image capture, and a reconfigurable rod array designed to minimize spurious wave interactions are specified. 15.
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Wilson, D., Daniel Breton, Lauren Waldrop, Danney Glaser, Ross Alter, Carl Hart, Wesley Barnes, et al. Signal propagation modeling in complex, three-dimensional environments. Engineer Research and Development Center (U.S.), April 2021. http://dx.doi.org/10.21079/11681/40321.

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The Signal Physics Representation in Uncertain and Complex Environments (SPRUCE) work unit, part of the U.S. Army Engineer Research and Development Center (ERDC) Army Terrestrial-Environmental Modeling and Intelligence System (ARTEMIS) work package, focused on the creation of a suite of three-dimensional (3D) signal and sensor performance modeling capabilities that realistically capture propagation physics in urban, mountainous, forested, and other complex terrain environments. This report describes many of the developed technical capabilities. Particular highlights are (1) creation of a Java environmental data abstraction layer for 3D representation of the atmosphere and inhomogeneous terrain that ingests data from many common weather forecast models and terrain data formats, (2) extensions to the Environmental Awareness for Sensor and Emitter Employment (EASEE) software to enable 3D signal propagation modeling, (3) modeling of transmitter and receiver directivity functions in 3D including rotations of the transmitter and receiver platforms, (4) an Extensible Markup Language/JavaScript Object Notation (XML/JSON) interface to facilitate deployment of web services, (5) signal feature definitions and other support for infrasound modeling and for radio-frequency (RF) modeling in the very high frequency (VHF), ultra-high frequency (UHF), and super-high frequency (SHF) frequency ranges, and (6) probabilistic calculations for line-of-sight in complex terrain and vegetation.
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