PPT-Time-distance measurements of

m eridional circulation using pairs of points at equal centertolimb angle Tom Duvall Deep Chakraborty Tim Larsen The problem eastwest signal very similar to northsouth Geometry for measurement technique. R.D.Gopinath. Supervisor – Optical Sales. Why Measure PDs ?. Spectacle lens optical centres (OCs) should correspond to the wearer’s PD. To avoid unwanted prismatic effect due to decentration especially in higher Rx powers. Lecture 4: The extragalactic distance scale. Prof.. . Dr.. M. Baes (. UGent. ). Prof.. . Dr.. C. . Waelkens. (KUL). Academic year 2015-2016. The expanding Universe. One of the most important cosmological discoveries: . The properties of matter must be measured correctly and reported without ambiguity. . Value- A quantities description that includes both a number and a unit. Units- quantities defined by standards that people have agreed to use to compare one event/object to another. How it Works. The . distance sensor . emits short bursts of sound and listens for this sound to echo off of nearby . objects. The sensor . measures the time of flight of the sound burst. A user then computes the distance to an object using this time of . . is the . measurement . and representation of the . shape of the Earth and its gravity field. Among the most important (& growing!) . a. pplications. of. . . geodesy monitoring/studies . Dennis Stewart. November. Smu. Modern Physics. 1. Outline for this talk. Einstein . Einsteins Contribution. Joseph Weber. LIGO. The Machine and How it works. The Chrip. Conclusion. 2. Albert Einstein. How it Works. The sensor emits short bursts of sound, and listens for the echo off nearby objects. By measuring the time of flight, distance can be computed. When. it doesn’t work. When waves are not reflected back towards the sensor. Trade Magazines. Newspapers, magazines, and blogs (pop . s. cience). A1 – . Meterstick. Measurements. Using the geometry of the sun, . Eratosthenes . measured the radius of the earth (c. 250 BC).. Review - Speed. Speed: . The measure of how fast/slow something moves a particular distance over a given amount of time.. It can then be calculated using the following formula: . v=d/t. How do you graph speed?. :. How . would. . you. define . distance. . learning. ?. In. . what. . way. is it . different. . from. . learning. . face-to-face. ?. Can . you. . think. of . different. . types. of . distance. Lightning NOx measurements during and after DC3 Harold Peterson: USRA Arastoo Biazar , Mike Newchurch , Wesley Cantrell: UAH GLM Science Meeting, Huntsville, AL September 19, 2012 Motivation Lightning This resource provides animated demonstrations of the mathematical method.. Check animations and delete slides not needed for your class.. Speed. What common units do we use to measure . speed. ?. Distance. Michael . Lombardi. Chair, SIM Time and Frequency Metrology Working Group. National Institute of Standards and Technology (NIST). lombardi@nist.gov. SIM is the . Interamerican. Metrology System, one of the world’s five major Regional Metrology Organizations (RMOs) recognized by the BIPM. Demonstration. This resource provides animated demonstrations of the mathematical method.. Check animations and delete slides not needed for your class.. 0. 5. 10. 15. 20. 25. 30. 35. 40. 0. 10. 20. 30.