DOCSLIB.ORG

ECHOES Fall 2005

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
ECHOES Fall 2005 The newsletter of The Acoustical Society of America Volume 15, Number 4 Fall 2005 Infrasound from the 2004-2005 earthquakes and tsunami near Sumatra Milton Garces, Pierre Caron, and Claus Hetzer Infrasound arrays in the infrasonic source location esti- Pacific and Indian Oceans that mates for the selected Sumatra are part of the International earthquake and tsunami Monitoring System (IMS) of the sequence, we deduce that sub- Comprehensive Nuclear-Test- marine earthquakes can pro- Ban Treaty (CTBT) recorded duce infrasound. The sound three distinct waveform signa- may be radiated by the vibra- tures associated with the tion of the ocean surface or the December 26, 2004 Aceh earth- vibration of land masses near quake (M9, USGS) and tsuna- the epicenter. mi. The infrasound stations It is also apparent that observed (1) seismic arrivals infrasound stations can also (P, S and surface waves) from serve as seismic and T-phase the earthquake, (2) tertiary stations for large events. For arrivals (T-phases), propagated the three submarine earth- along sound channels in the quakes that we investigated, ocean and coupled back into the differences in the observed the ground, and (3) infrasonic signals may be due to either arrivals associated with either source or propagation effects. the tsunami generation mecha- Although there is a substantial nism near the seismic source or difference between the infor- the motion of the ground above Paths of infrasound signals from earthquakes mation contained in the low sea level. All signals were (0.02 – 0.1 Hz) and high (0.5- recorded by the pressure sensors in the arrays. The seismic 5 Hz) frequency bands of the infrasound range, it does and T-phase recordings are due to the sensitivity of the micro- appear that both small (Nias) and large (Aceh) tsunamis phones to ground vibration, whereas the infrasound arrivals may produce infrasound. correspond to dispersed acoustic waves propagating through The candidate source locations near the epicenter, in con- atmospheric waveguides. A similar, but not identical, junction to the unique signal observed at Diego Garcia for the sequence of arrivals was observed at Diego Garcia Atoll Aceh event, suggests that infrasound may be combined with (range of ~2860 km) during the March 28, 2005 Nias earth- other technologies as a discriminator for tsunami genesis. quake (M8.7) and the April 10, 2005 Mentawai earthquakes Fundamental research is needed on how low-frequency sound (M6.7 and 6.5), suggesting that above-water ground motion from large earthquakes and tsunamis can be utilized in hazard can generate infrasound in the Sumatra region. In addition, warning and mitigation. very low frequency infrasound was produced in the Bay of Bengal region, suggesting that the interaction of the tsunami Milton Garces, Pierre Caron, and Claus Hetzer are at the with the coastal bathymetry can produce sound. Infrasound Laboratory at the University of Hawaii. This arti- From the prominent features of infrasonic arrivals and cle is based on paper 2aPA1 at the Vancouver ASA meeting. We hear that... ț ASA Fellow Jan Achenbach, Walter P. ț Masakazu Konishi and Eric Knudsen will share the Murphy Professor and Distinguished $200,000 Neuroscience Prize from the Peter Gruber McCormick School Professor of the Foundation for their research on the neural circuits and mech- Departments of Mechanical Engineering and anisms that underlie sound localization in barn owls. Konishi Civil and Environmental Engineering at is at the California Institute of Technology, while Knudsen is at Northwestern University was awarded the National Medal of Stanford University. Technology. He was presented this award, the nation’s highest honor for technological innovation, by President Bush in From the editor Washington D.C. at the White House on March 14, 2005. A big event for the Acoustical Society of America is the ț ASA Fellow Clive Dym, Professor of Engineering at Harvey launching of the new magazine Acoustics Today. Dick Stern is Mudd College, has been awarded the Ruth and Joel Spira especially to be congratulated for creating this new magazine. Outstanding Design Educator Award for “exceptional contri- ECHOES is proud to become a part of this new magazine. butions to design education through widely-cited authorship Since the publication of ECHOES has been tied to ASA on engineering design, through sponsorship of the ASA work- meetings and since the Fall meeting in Minneapolis is being shops and conference panels, and through enthusiastic mentor- held earlier than usual, it was decided to publish two slightly ing of engineering students in the art and science of design.” different versions of ECHOES. This version will be printed and ț ASA Fellow Ira Hirsh has received a Life Achievement mailed to members so they will receive it well in advance of Award from the American Auditory Society. The announce- the Minneapolis meeting, and it will go online, as usual. The ment was made at the Society’s 2005 Scientific and other version will be incorporated into Acoustics Today. In the Technology Meeting in Scottsdale, Arizona. future, only one version is planned. ASA Fellow H. Vincent Poor, George Van Ness Lothrop As usual, I urge readers to submit Letters to the Editor, Professor in Engineering at Princeton University, has been which are more interesting to read than letters from the editor. named the 2005 winner of the Distinguished Alumnus Award Thomas Rossing by the Tau Beta Pi engineering honor society at Auburn University. A $2000 scholarship will be given in Dr. Poor’s Message from the name to a deserving student member of Tau Beta Pi. President ț The American Institute of Physics State Department Science Fellowship represents an opportunity for scientists to William A. Yost make a contribution to U.S. foreign policy. At least one Fellow As I start my presidency the annually will be chosen to spend a year working in a bureau of ASA is in very good shape and the State Department, providing scientific and technical there are several new develop- expertise to the Department while becoming directly involved ments underway. The Society will in the foreign policy process. Fellows are required to be U.S. be publishing a new magazine, citizens and members of at least one of the 10 AIP Member Acoustics Today. ARLO (Acoustics Societies at the time of application. Please visit Research Letters OnLine) is under- http://www.aip.org/gov/sdf.html for details. All application going change under the new edi- materials must be postmarked by November 1, 2005. torship of Keith Wilson. The upcoming ASA meetings in Minneapolis and Providence will be excellent, and I hope you will attend one or both. The Minneapolis meeting will be a joint ASA/NOISE-CON meeting. The work of Dick Stern’s Vision 2010 Committee is coming to an end, and a report on suggestions for ASA’s future will be forthcoming. We continue Newsletter of the Acoustical Society of America to monitor the financial health of ASA. The Society is fiscally Provided as a benefit of membership to ASA members sound and we have several groups working to make sure we stay that way. The Acoustical Society of America was organized in 1929 I thought I would take a few words to explain a little bit to increase and diffuse the knowledge of acoustics and to about the organization of the ASA that is responsible for its promote its practical applications. management. The ASA is a largely volunteer organization, but Echoes Editor . .Thomas Rossing we do have a small, but outstanding staff in both the ASA Editor-in-Chief . .Allan Pierce Advisors . .Elaine Moran, Charles Schmid Headquarters and Standards offices. While the President of the ASA is its CEO, the main day-to-day operations are expertly Phone inquiries: 516-576-2360. Contributions, including managed by our Executive Director, Charles Schmid. The ASA Letters to the Editor, should be sent to Thomas Rossing, Physics Dept., Northern Illinois University, Dekalb, IL office is under the leadership Elaine Moran, ASA Office 60115 <[email protected]> Manager, and is located in Melville, New York on the site of the continued on next page 2 Acoustics in the City of Lakes ASA’s papers will 150th meeting be presented. will be a joint ASA has meeting with scheduled a NOISE-CON distinguished 2005 in the lecture by beautiful city Manfred of Minnea- Schroeder, polis. It is and NOISE- hard to be- Technical Program Organizing Meeting in Minneapolis CON has lieve that this is only our second meeting in this lovely city, and scheduled plenary talks by Carl Burleson, Paul Donavan, and it is a meeting you will not want to miss. Minneapolis has James West. A one-day colloquium and discussion on the seven lakes within the city limits, and there are many more in topic “Imaging and Control of HIFU-Induced Lesions” will neighboring St. Paul and the suburbs, not to mention over be held on Tuesday, October 18, and a seminar on Power 11,000 of them throughout the state of Minnesota. Strolling or Plant Noise will be given by Frank Brittain on Sunday, biking around these lakes is a favorite pastime of visitors, but if October 16, 1:00 p.m.-5:00 p.m. A tutorial on Diagnostic shopping is more to your liking, the Mall of America is the Imaging in Biomedical Ultrasound will be given by E. Carr largest indoor shopping mall in the United States. Everbach on Monday, October 17, at 7:00 p.m. Minneapolis is the cultural center of the Upper Midwest, ASA/INCE members are invited to attend a rehearsal of with the Tyrone Guthrie Theater, the Walker Art Center, the the Minnesota Orchestra (Osmo Vanska, conductor) on Tuesday Minneapolis Institute of Art, and Orchestra Hall all close to afternoon, October 18, followed by a guided tour of Orchestra downtown, and the Weisman Art Museum not far away on the Hall with Cyril Harris as tour guide.
Load more

Recommended publications
  • 9Th INTERNATIONAL CONTEST „MUZIKOS BURTAI 2020“ for YOUNG FOLK INSTRUMENT SOLOISTS
    CONFIRMED Headmaster of Klaipėda’s Jeronimas Kačinskas music school September 15, 2020 Order No. V-31 9th INTERNATIONAL CONTEST „MUZIKOS BURTAI 2020“ FOR YOUNG FOLK INSTRUMENT SOLOISTS REGULATIONS This document is a reglament of 9th International Contest’s „MUZIKOS BURTAI 2020“ For Young Folk Instrument Soloists (further Contest) purpose, participants, programme, application, implementation, evaluation and awards. This Contest is an online event, free of charge. CONTEST ORGANIZERS Klaipėda’s Jeronimas Kačinskas music school, Lithuania, folk music instrument teachers. CONTEST’S PURPOSE AND TASKS 1. Embrace students' musical self expression, focusing on their individuality. 2. Encourage young artists to appreciate and value folk instruments. 3. Expand cooperation experience between music and art teachers giving them an opportunity to share their professional knowledge. CONTEST PARTICIPANTS We invite 2nd year kanklės, kokle, kannele, kantele, bandura artists and 2nd and 3rd year birbynė, lumzdelis artists to participate in this contest. CONTEST PROGRAMME 2nd year kanklės, kokle, kannele, kantele, bandura artists have to play one piece by heart. You have to choose from these three options prepared by contest organizers: Polka „Šok, tėveli“, written by Pranas Stepulis (1913 - 2007); Etude „Mergaitės šokis“, written by Heinrich Wohlfahrt (1797 - 1883); Etude „Kaimiškas šokis“, written by Heinrich Wohlfahrt (1797 - 1883); All pieces have to be played with repeat. 2nd and 3rd year birbynė, lumzdelis artists have to play two pieces by heart: 1. Any piece of your choice; 2. Mandatory piece - any from these four options prepared by contest organizers: Lithuanian folk song „Skrido uodas“ harmonized by Balys Dvarionas; „Pasaka“, written by S. Lukaniuk; „Do Re Mi“, written by Richard Rodgers; „Pirma nuotaika“ written by Tomas Leiburas - from the cycle „Trys nuotaikos“.
    [Show full text]
  • The Science of String Instruments
    The Science of String Instruments Thomas D. Rossing Editor The Science of String Instruments Editor Thomas D. Rossing Stanford University Center for Computer Research in Music and Acoustics (CCRMA) Stanford, CA 94302-8180, USA [email protected] ISBN 978-1-4419-7109-8 e-ISBN 978-1-4419-7110-4 DOI 10.1007/978-1-4419-7110-4 Springer New York Dordrecht Heidelberg London # Springer Science+Business Media, LLC 2010 All rights reserved. This work may not be translated or copied in whole or in part without the written permission of the publisher (Springer Science+Business Media, LLC, 233 Spring Street, New York, NY 10013, USA), except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed is forbidden. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights. Printed on acid-free paper Springer is part of Springer ScienceþBusiness Media (www.springer.com) Contents 1 Introduction............................................................... 1 Thomas D. Rossing 2 Plucked Strings ........................................................... 11 Thomas D. Rossing 3 Guitars and Lutes ........................................................ 19 Thomas D. Rossing and Graham Caldersmith 4 Portuguese Guitar ........................................................ 47 Octavio Inacio 5 Banjo ...................................................................... 59 James Rae 6 Mandolin Family Instruments........................................... 77 David J. Cohen and Thomas D. Rossing 7 Psalteries and Zithers .................................................... 99 Andres Peekna and Thomas D.
    [Show full text]
  • Acoustic Textiles - the Case of Wall Panels for Home Environment
    Acoustic Textiles - The case of wall panels for home environment Bachelor Thesis Work Bachelor of Science in Engineering in Textile Technology Spring 2013 The Swedish school of Textiles, Borås, Sweden Report number: 2013.2.4 Written by: Louise Wintzell, Ti10, [email protected] Abstract Noise has become an increasing public health problem and has become serious environment pollution in our daily life. This indicates that it is in time to control and reduce noise from traffic and installations in homes and houses. Today a plethora of products are available for business, but none for the private market. The project describes a start up of development of a sound absorbing wall panel for the private market. It will examine whether it is possible to make a wall panel that can lower the sound pressure level with 3 dB, or reach 0.3 s in reverberation time, in a normally furnished bedroom and still follow the demands of price and environmental awareness. To start the project a limitation was made to use the textiles available per meter within the range of IKEA. The test were made according to applicable standards and calculation of reverberation time and sound pressure level using Sabine’s formula and a formula for sound pressure equals sound effect. During the project, tests were made whether it was possible to achieve a sound classification C on a A-E grade scale according to ISO 11654, where A is the best, with only textiles or if a classic sound absorbing mineral wool had to be used. To reach a sound classification C, a weighted sound absorption coefficient (αw) of 0.6 as a minimum must be reached.
    [Show full text]
  • Chapter IX: Ukrainian Musical Folklore Discography As a Preserving Factor
    Art Spiritual Dimensions of Ukrainian Diaspora: Collective Scientific Monograph DOI 10.36074/art-sdoud.2020.chapter-9 Nataliia Fedorniak UKRAINIAN MUSICAL FOLKLORE DISCOGRAPHY AS A PRESERVING FACTOR IN UKRAINIAN DIASPORA NATIONAL SPIRITUAL EXPERIENCE ABSTRACT: The presented material studies one of the important forms of transmission of the musical folklore tradition of Ukrainians in the United States and Canada during the XX – the beginning of the XXI centuries – sound recording, which is a component of the national spiritual experience of emigrants. Founded in the 1920s, the recording industry has been actively developed and has become a form of preservation and promotion of the traditional musical culture of Ukrainians in North America. Sound recordings created an opportunity to determine the features of its main genres, the evolution of forms, that are typical for each historical period of Ukrainians’ sedimentation on the American continent, as well as to understand the specifics of the repertoire, instruments and styles of performance. Leading record companies in the United States have recorded authentic Ukrainian folklore reconstructed on their territory by rural musicians and choirs. Arranged folklore material is represented by choral and bandura recordings, to which are added a large number of records, cassettes, CDs of vocal-instrumental pop groups and soloists, where significantly and stylistically diversely recorded secondary Ukrainian folklore (folklorism). INTRODUCTION. The social and political situation in Ukraine (starting from the XIX century) caused four emigration waves of Ukrainians and led to the emergence of a new cultural phenomenon – the art and folklore of Ukrainian emigration, i.e. diaspora culture. Having found themselves in difficult ambiguous conditions, where there was no favorable living environment, Ukrainian musical folklore began to lose its original identity and underwent assimilation processes.
    [Show full text]
  • Modelling Body Vibration and Sound Radiation of a Modified Kantele
    Henna Tahvanainen Modelling body vibration and sound radiation of a modified kantele School of Electrical Engineering Thesis submitted for examination for the degree of Master of Science in Technology. Espoo 26.11.2012 Thesis supervisor: Prof. Vesa V¨alim¨aki Thesis instructor: D.Sc. (Tech.) Henri Penttinen Aalto University School of Electrical A? Engineering aalto university abstract of the school of electrical engineering master's thesis Author: Henna Tahvanainen Title: Modelling body vibration and sound radiation of a modified kantele Date: 26.11.2012 Language: English Number of pages:8+65 Department of Signal Processing and Acoustics Professorship: Acoustics and Audio Signal Processing Code: S-89 Supervisor: Prof. Vesa V¨alim¨aki Instructor: D.Sc. (Tech.) Henri Penttinen In this thesis, the vibrational modes and radiation of the body of a 15-string instrument called the kantele are modelled using the finite element method. Two traditional body structures, the top-plate kantele and the box kantele, are compared to a modified kantele with an air gap separating the top and the back plate. The modified structure allows the kantele top plate to vibrate freely. In addition, together the top and back plate create an enclosed air mass that has its own vibrational modes. The modified kantele has previously been shown to be louder than the traditional top plate kantele. In this thesis, it is shown that the modified kantele includes vibrational modes of both the freely vibrating top plate and the enclosed air. Thus, it has a higher mode density than the traditional kanteles. Because of the coupling of the enclosed air modes to the body, the modified kantele radiates more omni-directionally than the traditional kanteles.
    [Show full text]
  • 7'Tie;T;E ~;&H ~ T,#T1tmftllsieotog
    7'tie;T;e ~;&H ~ t,#t1tMftllSieotOg, UCLA VOLUME 3 1986 EDITORIAL BOARD Mark E. Forry Anne Rasmussen Daniel Atesh Sonneborn Jane Sugarman Elizabeth Tolbert The Pacific Review of Ethnomusicology is an annual publication of the UCLA Ethnomusicology Students Association and is funded in part by the UCLA Graduate Student Association. Single issues are available for $6.00 (individuals) or $8.00 (institutions). Please address correspondence to: Pacific Review of Ethnomusicology Department of Music Schoenberg Hall University of California Los Angeles, CA 90024 USA Standing orders and agencies receive a 20% discount. Subscribers residing outside the U.S.A., Canada, and Mexico, please add $2.00 per order. Orders are payable in US dollars. Copyright © 1986 by the Regents of the University of California VOLUME 3 1986 CONTENTS Articles Ethnomusicologists Vis-a-Vis the Fallacies of Contemporary Musical Life ........................................ Stephen Blum 1 Responses to Blum................. ....................................... 20 The Construction, Technique, and Image of the Central Javanese Rebab in Relation to its Role in the Gamelan ... ................... Colin Quigley 42 Research Models in Ethnomusicology Applied to the RadifPhenomenon in Iranian Classical Music........................ Hafez Modir 63 New Theory for Traditional Music in Banyumas, West Central Java ......... R. Anderson Sutton 79 An Ethnomusicological Index to The New Grove Dictionary of Music and Musicians, Part Two ............ Kenneth Culley 102 Review Irene V. Jackson. More Than Drumming: Essays on African and Afro-Latin American Music and Musicians ....................... Norman Weinstein 126 Briefly Noted Echology ..................................................................... 129 Contributors to this Issue From the Editors The third issue of the Pacific Review of Ethnomusicology continues the tradition of representing the diversity inherent in our field.
    [Show full text]
  • What's Going on Here?
    12/22/2017 2017 World Wood Day Donate (donate) (https://www.facebook.com/worldwoodday/?ref=hl) (https://www.instagram.com/worldwoodday/) (https://vimeo.com/woodculture) (https://www.youtube.com/channel/UCUUqTXdNxUgWhofyWZ_45-Q) HOME (/2017) ABOUT (ABOUT) USA REGIONAL (/2017) Music Festival MUSIC FESTIVAL Brief Participants Photos Videos World Wood Day 2017 Roots United - Highlight from Wood Culture What’s going on here? Some of your technology may be out of date, which means this video won’t play properly. Please upgrade your browser or install Flash. Play Music is a cross-cultural and artistic language which creates emotional and spiritual connections. 2017 WWD Music Festival’s theme is “Roots United”, featuring musicians from different continents to perform, share their passions with traditional wooden music instrument. The idea behind this music festival is to bring different wooden instruments from around the world, not only to showcase representative music but also to explore their similarities and how they can all come together to create harmonies. During March 21-24, and 26, musicians will be presenting eclectic music and introduce origin of their music instruments, along with cultural background to the public. The Music Concert on March 25 takes place at Terrace Theater, expecting musical talent, visually pleasing and entertaining for the audience. With around 40 groups of local and foreign singers, dancers and musicians, 2017 WWD Music Festival aim to take the audience on a musical journey of culture, legend and heritage. http://www.worldwoodday.org/2017/music 1/36 12/22/2017 2017 World Wood Day Participants (In the alphabetical order of the country and region represented) DAVID HUDSON AUSTRALI A David Hudson’s life reflects his love and belief in Aboriginal culture.
    [Show full text]
  • Viktória Herencsár: Sound of Eurasia
    Viktória Herencsár: Sound of Eurasia There was organize a festival for the instrument family of zither and cimbalom in the capital of Buryatia, Ulan Ude from 13. to 18. September 2011. I was invited to this event to show the culture of the Hungarian cimbalom. The place of the festival was in the Academy of Arts in Ulan Ude. The lectures were in the class rooms and the concerts were in the concert hall of the Academy with 800 seats. The event began on 13th September with the meeting between the participants and the leaders of the organizing committee (cultural minister of the state, mayor of the town Ulan Ude, president of the Academy, etc.) The local artists gave concert on the opening ceremony, who played on their national instruments, yataga and yochin. The yataga is same instrument like the Chinese guchen or Japan koto. The yochin is same, like the Chinese yangqin. Citizens of the Buryatia consist of Buryatian, Chinese, Mongolian and Russian people. Their music is consisting of the music culture of these nations. We can hear music, which character is like the Chinese music (pentatonic, many inflections), melodies with effect of the Mongolian throat singing, Russian style melodies, etc. After the national program of the opening ceremony had concert of Wilfried Scharf from Austria, who played on the Stayer zither. He played Austrian folk melodies and classical music. The next day had the lecturer of the Russian, Estonian and Chinese professors about the gusli, kannel and guchen. In line with this program were the lecturer about the cimbalom and yangqin.
    [Show full text]
  • Infrasound and Low Frequency Noise of a Wind Turbine
    Vibrations in Physical Systems Vol.26 (2014) Infrasound and Low Frequency Noise of a Wind TurBine Malgorzata WOJSZNIS Institute of Applied Mechanics, Poznan University of Technology 3 Piotrowo Street, 60-965 Poznań [email protected] Jacek SZULCZYK Environmental Acoustics Laboratory EKO – POMIAR 4 Sloneczna Street, 64-600 Oborniki [email protected] ABstract The paper presents noise evaluation for a 2 MW wind turbine. The obtained results have been analyzed with regard to infrasound and low frequency noise generated during work of the wind turbine. The evaluation was based on standards and decrees binding in Poland. The paper presents also current literature data on the influ- ence of the infrasound and low frequency noise on a human being. It has been concluded, that the permissible levels of infrasound for the investigated wind turbine were not exceeded. Keywords: low frequency noise, infrasound, wind turbine 1. Introduction Research that has been conducted in the world for many years shows that noise can be described as sound below and above so called hearing threshold . It can be assumed that the infrasound , which cannot be heard by a human being, concerns frequencies below 20 Hz, and the ultrasound concerns frequencies above 20 kHz [1]. We receive it as me- chanical vibrations of the medium it passes through, transferring energy from the source in the form of acoustic waves. Puzyna in [1] describes infrasound as infraaccoustic vi- brations . Some investigations show that for some people the hearing level begins already at 16Hz, and sometimes even at 4Hz. Such a phenomenon occurs at appropriate condi- tions and at a high level of sound pressure [2].
    [Show full text]
  • Infrasound and Ultrasound
    Infrasound and Ultrasound Exposure and Protection Ranges Classical range of audible frequencies is 20-20,000 Hz <20 Hz is infrasound >20,000 Hz is ultrasound HOWEVER, sounds of sufficient intensity can be aurally detected in the range of both infrasound and ultrasound Infrasound Can be generated by natural events • Thunder • Winds • Volcanic activity • Large waterfalls • Impact of ocean waves • Earthquakes Infrasound Whales and elephants use infrasound to communicate Infrasound Can be generated by man-made events • High powered aircraft • Rocket propulsion systems • Explosions • Sonic booms • Bridge vibrations • Ships • Air compressors • Washing machines • Air heating and cooling systems • Automobiles, trucks, watercraft and rail traffic Infrasound At very specific pitch, can explode matter • Stained glass windows have been known to rupture from the organ’s basso profunda Can incapacitate and kill • Sea creatures use this power to stun and kill prey Infrasound Infrasound can be heard provided it is strong enough. The threshold of hearing is determined at least down to 4 Hz Infrasound is usually not perceived as a tonal sound but rather as a pulsating sensation, pressure on the ears or chest, or other less specific phenomena. Infrasound Produces various physiological sensations Begin as vague “irritations” At certain pitch, can be perceived as physical pressure At low intensity, can produce fear and disorientation Effects can produce extreme nausea (seasickness) Infrasound: Effects on humans Changes in blood pressure, respiratory rate, and balance. These effects occurred after exposures to infrasound at levels generally above 110 dB. Physical damage to the ear or some loss of hearing has been found in humans and/or animals at levels above 140 dB.
    [Show full text]
  • Determination of Speed of Sound in the Air Using Kundt's Tube. the Exercise Aims to Determine the Speed of Sound in the Air with Kundt's Pipe's Application
    Determination of speed of sound in the air using Kundt's tube. The exercise aims to determine the speed of sound in the air with Kundt's pipe's application. 1. Theory Waves could be divided into three main types: 1. Mechanical waves – waves propagate as an oscillation of the medium, for example, sea waves, sound waves and seismic waves. They are propagating consistent with classical physics laws and can exist only in water, air or solid-state. 2. Electromagnetic waves – waves propagate as continuous changes of electric and magnetic fields. This kind of waves doesn't require a medium, and it can propagate in a vacuum. Light, radio waves, TV waves, microwaves, X-rays are examples of electromagnetic waves. They propagate with the speed of light. 3. Matter waves – waves related to all objects in motion. The wavelength of matter waves is given by ℎ ℎ de Broglie formula λ = = . It is easier to detect matter waves of particles (e.g. electrons) than 푚푣 푝 heavy objects like a human. The waves can be divided into two types depending on the oscillation medium's direction with respect to wave propagation direction. If the oscillation direction is perpendicular to the propagation's direction, this kind of wave is called the transverse wave. If the oscillation direction is parallel to the propagation's direction, this kind of wave is called a longitudinal wave. A following formula is used to describe the propagation of the harmonic wave : 푦(푥, 푡) = 퐴 푠푖푛(푘푥 − ω푡), where: 푦(푥, 푡, ) – displacement as a function of position x and time t, A – amplitude of the wave, k – wavenumber equal to 2π/λ, where λ is a wavelength (distance between to minimum or maximum of the wave) ω – circular frequency equal to 2π/T, where T means oscillation period (kx-ωt) – phase of the wave.
    [Show full text]
  • Mariinsky at BAM Opens with a Contemporary Opera Rarity—The Enchanted Wanderer, Jan 14
    Mariinsky at BAM opens with a contemporary opera rarity—The Enchanted Wanderer, Jan 14 Rodion Shchedrin’s mystic opera comes to New York in its first full staging Bloomberg Philanthropies is the 2014—2015 Season Sponsor BAM and the Mariinsky present The Enchanted Wanderer By Rodion Shchedrin Directed by Alexei Stepanyuk Mariinsky Opera Musical direction by Valery Gergiev Conducted by Valery Gergiev Libretto by the composer after the novel by Nikolai Leskov, The Enchanted Wanderer Set design by Alexander Orlov Costume design by Irina Cherednikova Lighting design by Yevgeny Ganzburg Choreography by Dmitry Korneyev Cast: Oleg Sychov (Ivan Severyanovich Flyagin, Storyteller) Andrei Popov (Flogged monk, Prince, Magnetiser, Old man in the woods, Storyteller) Kristina Kapustinskaya (Grusha the Gypsy, Storyteller) In Russian with English titles BAM Howard Gilman Opera House (30 Lafayette Ave) Jan 14 at 7:30pm Tickets start at $45 Brooklyn, Dec 8, 2014—Rodion Shchedrin’s The Enchanted Wanderer—in a fully staged US production premiere—ushers in the momentous, two-week BAM residency of the Mariinsky Theatre of St. Petersburg, led by Artistic Director Valery Gergiev, with its world- renowned opera, ballet, and orchestra on one stage in Brooklyn. The opera, a commission of the New York Philharmonic, has not been performed in New York since its world premiere in 2002. In The Enchanted Wanderer, Ivan Severyanovich Flyagin, the eponymous wanderer and a repentant monk, recounts his youthful misadventures and entanglement in the torrid love affair of the Prince and the beautiful Gypsy girl Grusha. Rodion Shchedrin wrote the libretto based on a novel by Nikolai Leskov (whose story was also the source of Shostakovich’s Lady Macbeth of Mtsensk).
    [Show full text]