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Propagation Of High Intensity Low Frequency Sound Without Loss
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Book Synopsis Propagation of High-Intensity, Low-Frequency Sound Without Loss by : Kenneth J. Oscar
Download or read book Propagation of High-Intensity, Low-Frequency Sound Without Loss written by Kenneth J. Oscar and published by . This book was released on 1970 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes a research program on sound propagation conducted under the In-house Laboratory Independent Research program. The objective of this work was to develop a concept to transmit high-intensity, low- frequency sound over a distance without large losses of sound-pressure level. An arbitrary goal of reducing the normal inverse square propagation law by 50 percent was chosen and achieved in the regions tested. A hyperbolic lens and hemispherical reflector were developed and tested for directivity improvement.
Book Synopsis Journal of Rehabilitation R & D by :
Download or read book Journal of Rehabilitation R & D written by and published by . This book was released on 1993 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of Rehabilitation Research and Development by :
Download or read book Journal of Rehabilitation Research and Development written by and published by . This book was released on 1993 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Propagation of Low Frequency Sound Through an Audience by : Elena Shabalina
Download or read book The Propagation of Low Frequency Sound Through an Audience written by Elena Shabalina and published by Logos Verlag Berlin GmbH. This book was released on 2014 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: At large outdoor concerts or festivals subwoofers, the dedicated low frequency loudspeakers, are often placed in a row in front of the stage as an evenly spaced array in order to control the directivity of sound at low frequencies. The audience itself often stands tightly packed in front of the array, so that sound waves propagate partly through the audience and partly over it. This thesis presents an investigation on how exactly the presence of the audience influences the propagation of sound. A mathematical model of an audience as an equivalent fluid is constructed with the help of the porous medium theory. The equivalent fluid parameters, such as the wave impedance, the speed of sound and the reflection coefficient from the audience/air boundary, are calculated both for a constant and a variable concentration of an audience. The model is verified by a Boundary Element Method simulation, scale measurements and live concert measurements. A new live measurement method is developed to evaluate the low frequency sound pressure level distribution without disturbing the ongoing event. The study reaches the conclusion that at low frequencies an audience forms a medium with the impedance significantly different from the impedance of the air, which leads to the reflection of sound waves from the boundaries back into the audience and increase of the sound pressure level as well as interference effects. Possible applications of the findings are mainly sound system design and event planning.
Book Synopsis Hybrid Formulation of Wave Propagation and Scattering by : L.B. Felsen
Download or read book Hybrid Formulation of Wave Propagation and Scattering written by L.B. Felsen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Workshop on Hybrid Formulations of Wave Propagat~on and Scattering underwent a sequence of iterations before emerging in the format recorded here. These iterations were caused by various administrative and logistical problems which need not be detailed. However, its direction being set initially, the iterations led to modifications of the original concept so that the final form was arrived at through an indirect approach. This circumstance may ex plain some possible deficiencies which might have been removed, had the final concept been implemented directly. The motivation arose from a perception that the newly restored interest, coupled with new developments, in hybrid methods employ ing progressing wave fields and oscillatory wave fields for time harmonic and transient guided propagation in manmade or general geo physical environments, and for scattering by targets and irregulari ties, merits exposure to the wider scientific community. Accord ingly, a meeting with highly tutorial content was envisaged. For administrative reasons, related to sponsorship and organizational structure, this objective could not be realized but, eventually, there emerged the possibility of convening an Advanced Research Workshop (ARW) under the auspices of the NATO Advanced Study Insti tute Series. The original concept was then modified to accommodate a Workshop, wherein state-of-the-art science is discussed by a relatively small group of specialists, instead of tutorial presenta tions of more basic material.
Book Synopsis Hearing Loss by : National Research Council
Download or read book Hearing Loss written by National Research Council and published by National Academies Press. This book was released on 2004-12-17 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Millions of Americans experience some degree of hearing loss. The Social Security Administration (SSA) operates programs that provide cash disability benefits to people with permanent impairments like hearing loss, if they can show that their impairments meet stringent SSA criteria and their earnings are below an SSA threshold. The National Research Council convened an expert committee at the request of the SSA to study the issues related to disability determination for people with hearing loss. This volume is the product of that study. Hearing Loss: Determining Eligibility for Social Security Benefits reviews current knowledge about hearing loss and its measurement and treatment, and provides an evaluation of the strengths and weaknesses of the current processes and criteria. It recommends changes to strengthen the disability determination process and ensure its reliability and fairness. The book addresses criteria for selection of pure tone and speech tests, guidelines for test administration, testing of hearing in noise, special issues related to testing children, and the difficulty of predicting work capacity from clinical hearing test results. It should be useful to audiologists, otolaryngologists, disability advocates, and others who are concerned with people who have hearing loss.
Book Synopsis International Workshop on Low-Frequency Propagation and Noise, Woods Hole, Massachusetts, 14-19 October, 1974 by :
Download or read book International Workshop on Low-Frequency Propagation and Noise, Woods Hole, Massachusetts, 14-19 October, 1974 written by and published by . This book was released on 1977 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Surveillance Towed Array Sensor System Low Frequency Active (SURTASS LFA) Sonar by :
Download or read book Surveillance Towed Array Sensor System Low Frequency Active (SURTASS LFA) Sonar written by and published by . This book was released on 2001 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Naval Research Reviews written by and published by . This book was released on 1983 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of Rehabilitation Research & Development by :
Download or read book Journal of Rehabilitation Research & Development written by and published by . This book was released on 2001 with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Hearing Sciences, Third Edition by : Teri A. Hamill
Download or read book The Hearing Sciences, Third Edition written by Teri A. Hamill and published by Plural Publishing. This book was released on 2017-12-30 with total page 669 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Hearing Sciences, Third Edition addresses all topics critical to understanding the hearing sciences: acoustics, basic instrumentation, anatomy and physiology of the auditory and vestibular systems, and psychoacoustics. The text is intended for undergraduate courses in hearing science and to augment the graduate AuD curriculum. Basic and intermediate chapters are targeted to undergraduate students. Intermediate and advanced chapters are appropriate for AuD instruction. Advanced chapters summarize key points from introductory chapters, so assignment of those earlier chapters is not required if the student has previously had a survey course in hearing science. Direct relevance to clinical audiology is featured. For example, the text contains comprehensive explanation of the active mechanisms of the cochlea and relates this to otoacoustic emissions and hearing loss. The writing is straightforward and clear. Each chapter includes an introduction, summary, and review questions. "Clinical Correlate" boxes engage the student by demonstrating the relationships between the hearing sciences and clinical audiology. New to the Third Edition: An updated art program with more illustrations and imagesA new chapter on advanced vestibular anatomy and physiology, and thorough updates to the prior vestibular contentContinued attention to conveying information in a straightforward manner while reflecting the current state of researchKey concepts bolded throughout for greater comprehension and accessibilityReview questions added to each chapter to ensure students grasp and retain the information
Book Synopsis Hyrdoacoustic Ocean Exploration by : Iftikhar B. Abbasov
Download or read book Hyrdoacoustic Ocean Exploration written by Iftikhar B. Abbasov and published by John Wiley & Sons. This book was released on 2016-09-06 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only book that offers a comprehensive and fully up-to-date coverage of hydroacoustic ocean exploration, this work deals with the diagnostics of non-uniformities in a water medium using the hydroacoustic parametric antenna. The non-uniformities of the water medium in the study are of geometrically regular shape, i.e., the shape of a sphere, a cylinder, and a spheroid. An account is given of theoretical and experimental studies of wave processes that occur in the event of the scattering of non-linearly interacting acoustic waves at a sphere, a cylinder, and a spheroid. Scattering problems are formulated; solutions to the inhomogeneous wave equation are found in the first and second approximations using the successive approximations method. For the first time, high-frequency asymptotic expressions of acoustic pressure for all spectral components of the secondary field are obtained for the nonlinear scattering problem. The scattering diagrams are calculated and plotted, and then analyzed and compared. Results of experimental studies of the parametric acoustic antenna field scattering at solid steel spheres are presented. Experimental scattering diagrams both for the parametric antenna pump waves and for the secondary field waves including the difference frequency wave, the sum frequency wave, and the second harmonic wave are presented. 3D modeling of wave processes is also considered. A must have for researchers and specialists in nonlinear hydroacoustics and ocean acoustics; it also may be of use for postgraduates and students specializing in hydroacoustics and ocean exploration.
Book Synopsis Springer Handbook of Acoustics by : Thomas Rossing
Download or read book Springer Handbook of Acoustics written by Thomas Rossing and published by Springer Science & Business Media. This book was released on 2007-06-21 with total page 1179 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an unparalleled modern handbook reflecting the richly interdisciplinary nature of acoustics edited by an acknowledged master in the field. The handbook reviews the most important areas of the subject, with emphasis on current research. The authors of the various chapters are all experts in their fields. Each chapter is richly illustrated with figures and tables. The latest research and applications are incorporated throughout, including computer recognition and synthesis of speech, physiological acoustics, diagnostic imaging and therapeutic applications and acoustical oceanography. An accompanying CD-ROM contains audio and video files.
Book Synopsis Springer Handbook of Acoustics by : Thomas Rossing
Download or read book Springer Handbook of Acoustics written by Thomas Rossing and published by Springer. This book was released on 2015-01-15 with total page 1280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustics, the science of sound, has developed into a broad interdisciplinary field encompassing the academic disciplines of physics, engineering, psychology, speech, audiology, music, architecture, physiology, neuroscience and others. Here is an unparalleled modern handbook reflecting this richly interdisciplinary nature edited by one of the acknowledged masters in the field, Thomas Rossing. Researchers and students benefit from the comprehensive contents spanning: animal acoustics including infrasound and ultrasound, environmental noise control, music and human speech and singing, physiological and psychological acoustics, architectural acoustics, physical and engineering acoustics, medical acoustics and ocean acoustics. The Springer Handbook of Acoustics reviews the most important areas of acoustics, with emphasis on current research. The authors of the various chapters are all experts in their fields. Each chapter is richly illustrated with figures and tables. The latest research and applications are incorporated throughout, e.g. computer recognition and synthesis of speech, physiological acoustics, psychological acoustics, thermoacoustics, diagnostic imaging and therapeutic applications and acoustical oceanography. This new edition of the Handbook features over 11 revised and expanded chapters, new illustrations and two new chapters covering microphone arrays, acoustic metamaterials and acoustic emission. These improvements will make the handbook even more useful as a reference and a guide for researchers and students in every branch of acoustics. Praise for the first edition: "This treatise is a successful attempt to cover in one book the diverse field of acoustics, which ranges from physics to music and from formal mathematics to technological applications. ... It is this reviewer's opinion that a handbook like Rossing's, which covers the whole field of acoustics, serves a real purpose because it not only gives one a chance to see how one's specialty is covered but it also permits one to make a quick survey of other acoustical areas." (Leo Beranek, American Journal of Physics, Vol. 77 (12), December, 2009) "The Springer Handbook of Acoustics falls into that exceptional list. ...every physics department should have a copy available." (John L. Hubisz, The Physics Teacher, Vol. 48, March, 2010) "This handbook is an excellent addition to the acoustics literature. ... The handbook nicely covers both basics and advances in several areas of acoustics. Several chapters provide good mathematical depth, making the handbook useful as a research and technical resource. ...Overall, a very useful educational and research resource. Summing Up: Recommended. Upper-division undergraduates through professionals." (M. G. Prasad, CHOICE, Vol. 45 (5), January, 2008) "This book covers a wide range of topics and the inclusion of musical acoustics, computer and electronic music appeal to me (singer, song-writer, performer and recording studio co-owner). This handbook is probably well suited for an undergraduate-level introduction to an acoustics course. ... The wide range of topics, inclusion of music-related chapters, eye-pleasing presentations and other useful features make this a very good book to have on your shelf." (Tim Casey, International Journal of Acoustics and Vibration, Vol. 13 (1), 2008) "The Springer Handbook of Acoustics comprises 28 chapters written by 33 authors. The Handbook of Acoustics is useful as a source book for anyone who needs or wants to become familiar with the jargon and issues related to a specific subfield of acoustics ... ." (Robert I. Odom, Siam Review, Vol. 50 (3), 2008) The Springer Handbook of Acoustics reviews the most important areas of acoustics, with emphasis on current research. The authors of the various chapters are all experts in their fields. Each chapter is richly illustrated with figures and tables. The latest research and applications are incorporated throughout, e.g. computer recognition and synthesis of speech, physiological acoustics, psychological acoustics, thermoacoustics, diagnostic imaging and therapeutic applications and acoustical oceanography. This new edition of the Handbook features over 13 revised and expanded chapters, new illustrations and 3 new chapters covering microphone arrays, acoustic metamaterials and acoustic emission. These improvements will make the handbook even more useful as a reference and a guide for researchers and students in every branch of acoustics.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1972 with total page 1056 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Biology of the Guinea Pig by : Joseph E. Wagner
Download or read book The Biology of the Guinea Pig written by Joseph E. Wagner and published by Academic Press. This book was released on 2014-04-25 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approx.317 pages
Download or read book Mariana Islands Range Complex written by and published by . This book was released on 2010 with total page 918 pages. Available in PDF, EPUB and Kindle. Book excerpt:
