PPT-Spiral density waves

Spiral density waves Dispersion relation Toomre Q parameter Torque formula gap opening criterion planet migration History Galactic spiral arms first considered by LyndenBell as density waves. Automatic Generation of . Industry Strength Performance Libraries. Franz Franchetti. Carnegie . Mellon . University. www.ece.cmu.edu/~franzf. CTO and Co-Founder, . SpiralGen. www.spiralgen.com. This work was supported by . Doppler Effect. ~apparent change in frequency of a wave due to the motion of the source of the wave.. If the object is moving towards the observer the frequency will appear to increase. If the object is moving away from the observer the frequency will appear to decrease. By. Chris . W. ilson. And. Geoff . Zelder. History. Pedro . Nunes. , a sixteenth century Portuguese cosmographer discovered that the shortest distance from point A to point B on a sphere is not a straight line, but an arc known as the great circle route.. PhD Candidate – University of Southampton. Presentation given during the AIDA Reinsurance Working Party Meeting in Istanbul - 3 May 2012. What was it?. In words. Aberration. Extraordinary. Claims’ . Waves transfer energy!. A wave does not carry matter . It only moves matter as it travels through it.. Waves. Compression (longitudinal) waves . are waves in which the particles of the medium move in a direction . Before the waves are made the particles are same distance apart. While waves moves through the medium the particles . compress. together, then they spread further apart (stretched areas)- . rarefaction.. OLEH:. RONI WIJAYA. 08018184. LATAR BELAKANG MASALAH. Identifikasi berdasarkan sidik jari adalah untuk mengindentifikasikan pengenalan pola sidik jari sangat diperlukan untuk aspek keamanan untuk itu di butuhkan Fingerprints dengan metode spiral model untuk akeses pintu masuk ruang kerja .. Warm-Up: February 17/18, 2016. Vibrations and Waves. Chapter 14. A . periodic motion . repeats in a regular cycle.. Examples include:. Pendulums (such as on a grandfather clock). A mass at the end of a spring. Wave. Repeating disturbance or movement. Carries energy through matter and space. Vibrations. Anything that moves in a rhythmic patter. Up and down. Back and forth. What is a Wave. All waves are produced when something vibrates. Group 6. The most common type of arrhythmia (irregular heartbeat). In AF, atria contract very fast and irregularly.. Atria get pooled by blood.. Blood not being able to go into ventricles completely.. Periodic Motion. Motion that repeats in a regular cycle is called . periodic motion. . . The revolution of a planet about its sun is an example of periodic motion. The highly reproducible period (T) of a planet is also called its year.. anelastic. media: explicit expressions for Q . Xu Liu . 1*. , Stewart Greenhalgh . 1. , Bing Zhou . 2. , Huijian Li . 1. 1. College of Petroleum Engineering & Geosciences, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Kingdom of Saudi Arabia. Energy is moving, not water. orbital motion. energy is transferred via circular motions. water (and gull) return to original position. the wave form moves forward. Motion decreases with depth. At. a depth of ½ of the wavelength, the motion is not significant.. The refractory period. E. xcitable systems can sustain spiral waves as well as plain waves. This is due to the refractory period. Three examples of the effect of the refractory period. Induction of spiral waves.