Download or read book Approaches to a Quantitative Analytical Description of Low Frequency Sound Absorption in Sea Water written by Daniel J. Whelan and published by . This book was released on 1980 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The absorption of sound in sea water at low frequency (1-100 kHz) and intermediate frequency (50-500 kHz) ranges can be defined by a series of relaxation phenomena, each of which can be described mathematically by a Debye relationship. Below 5 kHz, the principal absorption mechanism is attributed to borate and magnesium/carbonate interactions, while in the range 5 to 50 kHz the absorption arises from magnesium sulphate ion pair formation in sea water. The dependence of the various relaxation modes on oceanographic variables is outlined in quantitative terms based on results from deep ocean sound channel experiments and laboratory experiments.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Attenuation of Low Frequency Sound in the Sea written by and published by . This book was released on 1980 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and published by . This book was released on 1963 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book R D Abstracts written by Technology Reports Centre (Great Britain) and published by . This book was released on 1981 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Orgin of the Low Frequency Sound Absorption in Sea Water written by Ernest Yeager and published by . This book was released on 1972 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advances in Hydroscience written by Ven Te Chow and published by Elsevier. This book was released on 2013-10-22 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Hydroscience, Volume 1 considers the physical theories and mathematical analyses of a broad spectrum of specialized subjects in various branches of hydroscience, including hydrodynamics, hydrology, hydrochemistry, hydrophysics, hydrobiology, hydrometeorology, oceanology, hydrogeology, naval science, and water resources. This book contains five chapters, and begins with a presentation of scientific and engineering advances in the field of sonar and hydroelasticity. The following chapter deals with the fundamental principles and concepts of statistical hydrodynamics in porous media and their significance in various engineering applications. These topics are followed by a discussion on the concepts of theoretical incompressible fluid dynamics, with a special emphasis on the field of hydroballistics. The last chapter provides first a brief introduction to the basic principles and fundamental equations of well hydraulics, followed by a survey of its importance to water economy in arid and semiarid regions of the world. This book will be of great value to research workers and practitioners in the interdisciplinary field of hydroscience.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1982 with total page 1120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Host Bibliographic Record for Boundwith Item Barcode 30112005654915 and Others written by and published by . This book was released on 2013 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Australian National Bibliography written by and published by . This book was released on 1982-05 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index written by and published by . This book was released on 1982 with total page 1212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Meteorological and Geoastrophysical Abstracts written by and published by . This book was released on 1982 with total page 1552 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Low Frequency Sound Absorption in Sea Water A New Chemical Relaxation Mechanism written by D. G. Browning and published by . This book was released on 1981 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document presented the oral and visual presentation entitled 'Low Frequency Sound Absorption in Sea Water: A New Chemical Relaxation Mechanism?, ' presented at the 101st Meeting of the Acoustical Society of America, 18-22 May 1981, in Ottawa, Ontario, Canada. Excess sound absorption in sea water arises mainly from chemical relaxations involving MgS04 and B(OH)3. The high-frequency (100 kHz) MgS04 relaxation has been identified as a multistep ion-pair process. The low frequency (1 kHz) and B(OH)3 relaxation apparently involves more complex interactions with other constituents. To investigate B(OH)3 interactions in a simpler system, we measured absorption in NH3 solution using the resonator method. We have found alpha max to be proportional to the product of NH(+) and B(OH)4( - ) concentrations; however, the magnitude is much too large to be caused by the ion pair. The mechanism, probably similar to that in sea water, resembles catalysis, the absorption being governed by the large volume change of the faster NH3/NH4(+) equilibrium and the relaxation frequency by the slower B(OH)3/B(OH)4( - ) equilibrium. (Author).

Download or read book Low Frequency Sound in the Sea written by Naval Underwater Systems Center (U. S.) and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Review of Some Physical and Chemical Factors Affecting the Attenuation of Low Frequency Sound in Seawater written by Daniel J. Whelan and published by . This book was released on 1980 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: An attempt has been made to trace the contributions of various physical and chemical factors which effect the low frequency attenuation of sound observed in deep ocean channels and to establish that chemical relaxational processes do in fact contribute to the overall attenuation of this sound. The available evidence indicates that below 0.5 kHz, attenuation is affected predominantly by diffraction and diffusive scattering, but in the range 0.5 to 2.5 kHz, it is the effects of chemical relaxation processes, involving boric acid/borate and magnesium/carbonate equilibria, which dominate the sound absorption phenomenon.

Download or read book Cities and Their Vital Systems written by Advisory Committee on Technology and Society and published by National Academies Press. This book was released on 1989 with total page 1298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cities and Their Vital Systems asks basic questions about the longevity, utility, and nature of urban infrastructures; analyzes how they grow, interact, and change; and asks how, when, and at what cost they should be replaced. Among the topics discussed are problems arising from increasing air travel and airport congestion; the adequacy of water supplies and waste treatment; the impact of new technologies on construction; urban real estate values; and the field of "telematics," the combination of computers and telecommunications that makes money machines and national newspapers possible.

Download or read book A Review of Low Frequency Sound Attenuation in the Ocean written by W. H. Thorp and published by . This book was released on 1971 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The trend to lower sonar frequencies following WW 2 has revealed the existence of two and possibly more regimes of excess attenuation of sound in the oceans. The first of these, identified as a relaxation absorption caused by the MgSO4 content in sea water and, below 100 kHz, results in an increase in the absorption coefficient over fresh water by roughly a factor of 20. The second shows a further increase by a factor of 10 below 1 kHz. A number of hypotheses, including a second relaxation, have been proposed to explain the excess attenuation anomaly. Experimental techniques, data analysis, and mathematical models are discussed. (Author).