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Now Hear This: The Sound of Science A Museum of Science Traveling Program Description Now Hear This: The Sound of Science is an exciting 60-minute presentation about the physics of sound and vibrations. Needs We bring all materials and equipment, including a video projector and screen. Access to 110- volt electricity is required. Space Requirements The program can be presented in assembly- suitable spaces like gyms, multipurpose rooms, cafeterias, and auditoriums. Goals: Vibrations We establish that sounds are a kind of vibration that require a medium to travel through. In the vacuum of a bell jar, no air means no vibration—and therefore no sound! Goals: Waves We demonstrate that sound is a type of wave, that can be measured by both Frequency and Amplitude. Goals: Waves These waves can be visualized with tools like a Chladni Plate, which can also demonstrate the concept of interference. Goals: Energy Sound is demonstrated to be a kind of energy that can turn into other kinds, and vice versa, like with a Rijke Tube that creates sound from heat. Sound and Music These changes in energy can be used to create extraordinary music from a Theremin or a Musical Tesla Coil. Finale A wine glass is shattered by a sound of the precise resonant frequency. Program Details • Can be booked for school groups. • Appropriate for third-, fourth-, fifth- or sixth- grade students studying sound and waves. • A 45-minute introductory version can be booked for mixed third- through sixth-grade groups. Program Details • Capacity is eight classes (200 students) per session. • Up to two consecutive sessions can be taught per day. NGSS Connections • 4-PS3-1. Use evidence to construct an explanation relating the speed of an object to the energy of that object. • 4-PS3-2. Make observations to show that energy can be transferred from place to place by sound, light, heat, and electric currents. • 4-PS3-4. Apply scientific principles of energy and motion to test and refine a device that converts kinetic energy to electrical energy or uses stored energy to cause motion or produce light or sound. • 4-PS4-1. Develop a model of a simple mechanical wave (including sound) to communicate that waves (a) are regular patterns of motion along which energy travels and (b) can cause objects to move. • 4-PS4-3. Develop and compare multiple ways to transfer information through encoding, sending, receiving, and decoding a pattern. • 6.MS-PS4-1. Use diagrams of a simple wave to explain that (a) a wave has a repeating pattern with a specific amplitude, frequency, and wavelength, and (b) the amplitude of a wave is related to the energy of the wave. • 6.MS-PS4-2. Use diagrams and other models to show that both light rays and mechanical waves are reflected, absorbed, or transmitted through various materials. NGSS Scientific and Engineering Practices Incorporated • Asking questions and defining problems. • Planning and carrying out investigations. • Using mathematics and computational thinking. • Developing and using models. • Analyzing and interpreting data. • Constructing explanations and designing solutions. 2017 – 2018 Prices Sessions per Day Price 1 Session $525 2 Sessions $900 Modest mileage fees are charged for sites more than 30 miles away. Now Hear This: The Sound of Science Photos © Photos© Nicolaus Czarnecki exclusively For information/reservations: for the Museum of Science Museumof the for mos.org/travelingprograms [email protected] 617-589-0354.

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Self-Oscillation
Self-oscillation Alejandro Jenkins∗ High Energy Physics, 505 Keen Building, Florida State University, Tallahassee, FL 32306-4350, USA Physicists are very familiar with forced and parametric resonance, but usually not with self- oscillation, a property of certain dynamical systems that gives rise to a great variety of vibrations, both useful and destructive. In a self-oscillator, the driving force is controlled by the oscillation itself so that it acts in phase with the velocity, causing a negative damping that feeds energy into the vi- bration: no external rate needs to be adjusted to the resonant frequency. The famous collapse of the Tacoma Narrows bridge in 1940, often attributed by introductory physics texts to forced resonance, was actually a self-oscillation, as was the swaying of the London Millennium Footbridge in 2000. Clocks are self-oscillators, as are bowed and wind musical instruments. The heart is a \relaxation oscillator," i.e., a non-sinusoidal self-oscillator whose period is determined by sudden, nonlinear switching at thresholds. We review the general criterion that determines whether a linear system can self-oscillate. We then describe the limiting cycles of the simplest nonlinear self-oscillators, as well as the ability of two or more coupled self-oscillators to become spontaneously synchronized (\entrained"). We characterize the operation of motors as self-oscillation and prove a theorem about their limit eﬃciency, of which Carnot's theorem for heat engines appears as a special case. We brieﬂy discuss how self-oscillation applies to servomechanisms, Cepheid variable stars, lasers, and the macroeconomic business cycle, among other applications. Our emphasis throughout is on the energetics of self-oscillation, often neglected by the literature on nonlinear dynamical systems.
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The Rijke Tube - a Thermo-Acoustic Device
GENERAL I ARTICLE The Rijke Tube - A Thermo-acoustic Device Shekhar M Sarpotdar, N Ananthkrishnan and S D Sharma Introduction The Rijke tube is simply a cylindrical tube with both ends open and a heat source placed inside it. The heat source may be a flame or an electrical heating element. Traditionally, the tube is positioned vertically on a stand (or even in your hand) and the Shekhar Sarpotdar is presently a Graduate heat source is introduced from below into the tube (Figure 1). Student, in MMAE For certain ranges of position of the heat source within the tube, department of the Rijke tube emits a loud sound. This phenomenon was liT, Chicago, USA. discovered by Rijke around 1850, and is therefore called the Rijke phenomenon. Sound production in the Rijke tube is a classic example of a thermo-acoustic phenomenon 1. Thermo acoustics refers to the creation of sound in a device due to the transfer of energy from a thermal source (e.g., a flame) to acous tic waves set up in the device 2 • N Ananthkrishnan research interests revolve When some of the acoustic energy escapes from the device and around the dynamics reaches our ears, it is perceived as sound. The Rijke tube is one and control of nonlinear phenomena in aircraft of the simplest examples of a thermo-acoustic device - one that flight, compressor flows, converts heat into acoustic energy (sound). liquid slosh, and combus tion acoustics. Rijke's original interest in the phenomenon appears to have been from the point of view of musical acoustics.
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Validation of a Physics‐Based Low‐Order Thermo‐Acoustic Model of a Liquid‐Fueled Gas
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Theremin: Ether Music and Espionage Free Download
THEREMIN: ETHER MUSIC AND ESPIONAGE FREE DOWNLOAD Albert Glinsky,Robert Moog | 480 pages | 02 Feb 2005 | University of Illinois Press | 9780252072758 | English | Baltimore, United States THEREMIN 100 Write a review See all reviews Write a review. Now I know it was my father. From Scratch is a collection of Tenney's hard-to-find writings arranged, edited, and revised Keri Latimer rated it it was amazing Jan 16, Pyrophone Rijke tube Singing Tesla coil. In the vegetable garden behind his parents' summer home, just outside the city, he constructed his own observatory where he discovered a new star. Encompassing societies of origin and destination from around the world, A Century of Transnationalism shows Tesla guitarist Frank Hannon used a theremin in the band's song "Edison's Medicine" from the album Psychotic Supper. It seemed to him "unlike others who operated more with Theremin: Ether Music and Espionage indices, expressions, and formulas shaded with symbolism. The centrifugal force of the mammoth rotating mechanism nearly tore apart the housing, and the horsepower required of its steam turbine engine was staggering. One of these electronics enthusiasts, Robert Moogbegan building theremins in the s, while he was a high-school student. That's where it all began. Many thousands are dying of famine and cold. Lists with This Book. This field, which extends to an active distance of a few feet, emanates from the two antennas; the vertical pitch control rod on the top of the cabinet, and the horizontal volume control loop on the side. Pickup not available. Mobile apps. It was about objects around us connected to our feelings Original Title.
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Rijke Tube Cancellation Device for Helicopters
(19) TZZ _T (11) EP 2 568 468 B1 (12) EUROPEAN PATENT SPECIFICATION (45) Date of publication and mention (51) Int Cl.: of the grant of the patent: G10K 11/175 (2006.01) 08.01.2014 Bulletin 2014/02 (21) Application number: 11189425.9 (22) Date of filing: 16.11.2011 (54) Rijke tube cancellation device for helicopters Rijke-Rohr-Unterdrückungsvorrichtung für Helikopter Dispositif pour l’annulation du tuyau de Rijke pour des hélicoptères (84) Designated Contracting States: (56) References cited: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB US-A- 3 685 610 GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR • CARVALHO J A ET AL: "Definition of heater location to drive maximum amplitude acoustic (30) Priority: 07.09.2011 US 201113227231 oscillations in a Rijke tube", COMBUSTION AND FLAME, ELSEVIER SCIENCE PUBLISHING CO., (43) Date of publication of application: INC., NEW YORK, NY.; US, AMSTERDAM, NL, vol. 13.03.2013 Bulletin 2013/11 76, no. 1, 1 April 1989 (1989-04-01), pages 17-27, XP023608572, ISSN: 0010-2180, DOI: (73) Proprietor: Bell Helicopter Textron Inc. 10.1016/0010-2180(89)90073-4 [retrieved on Fort Worth, TX 76101 (US) 1989-04-01] • CHATTERJEE P ET AL: "On the spectral (72) Inventor: Sparks, David characteristics of a self-excited Rijke tube Forth Worth, TX 76118 (US) combustor-numerical simulation and experimental measurements", JOURNAL OF (74) Representative: Lawrence, John SOUND & VIBRATION, LONDON, GB, vol. 283, no. Barker Brettell LLP 3-5, 20 May 2005 (2005-05-20), pages 573-588, 100 Hagley Road XP004830542, ISSN: 0022-460X, DOI: Edgbaston 10.1016/J.JSV.2004.04.019 Birmingham • COLLYER A A ET AL: "Generation of harmonics B16 8QQ (GB) in a Rijke tube by using a single heating element", JOURNAL OF SOUND & VIBRATION, LONDON, GB, vol.
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Advancements in Thermophones: Sound Generation from Nanoscopic Heaters
Advancements in Thermophones: Sound Generation from Nanoscopic Heaters Nathanael Mayo Researchers adapt solid-state sound-generation techniques discovered Address: shortly after the invention of the telephone. Naval Undersea Warfare Center Introduction Sensors and Sonar It is often stated that “nothing is new” to portray the idea that everything that 1176 Howell Street we do and learn is, in one way or another, a recycled version of something that Newport, Rhode Island 02841 someone else has done before. I find this statement to be true everywhere I look, USA and in the instances in which it didn’t appear to be true, it was only because I Email: hadn’t looked hard enough. Of course, there is nothing wrong with this. It seems [email protected] only natural that we learn through imitation before we can then adapt what we’ve learned to something else by “standing on the shoulders of giants,” to borrow a metaphor. Even, at times, when our insights seem serendipitous or of our own accord, another has already come across the same concept before. Such was the case when, in 2008, a group from Tsinghua University in Beijing, China, passed an alternating electric current through a thin, transparent sheet of carbon nano- tubes (CNTs) and discovered that it produced sound (Barras, 2008). With a bit of investigation, they found that such a device, called a thermophone, had existed for over a century but that the modern nanomaterial had simply made it much more efficient than those of previous generations. In fact, there is currently an entire field of physics called thermoacoustics that is undergoing a revitalization and progressing because of advancements in modern technologies such as lasers, computing, and very large scale integration (VLSI) that enables the manufacture and patterning of nanoscale materials.
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