In telecommunications, extinction ratio (re) is the ratio of two optical power levels of a digital signal generated by an optical source, e.g., a laser diode. The extinction ratio may be expressed as a fraction, in dB, or as a percentage. It may be given by where P1 is the optical power level generated when the light source is on, and P0 is the power level generated when the light source is off. The polarization extinction ratio (PER) is the ratio of optical powers of perpendicular polarizations, usually called TE (transverse electric) and TM (transverse magnetic). In telecommunications, the PER is used to characterize the degree of polarization in a polarization-maintaining device or fiber. For coherent transmitter and receiver, the PER is a key parameter, since X polarization and Y polarization are coded with different signals. (Wikipedia).
This video defines a ratio and provides several examples on how to write a ratio and shows how to simplify a ratio. http://mathispower4u.wordpress.com/
From playlist Ratios and Rates
Ratios Introduction - what are ratios?
Ratios are used to compare different quantities. In this introduction to ratios we will look at what ratios are, how we deal with ratios of different measurement units and that ratios can be simplified. To donate to the tecmath channel:https://paypal.me/tecmath To support tecmath on Pa
From playlist Ratios
π Learn how to solve proportions. Two ratios are said to be proportional when the two ratios are equal. Thus, proportion problems are problems involving the equality of two ratios. When given a proportion problem with an unknown, we usually cross-multiply the two ratios and then solve for
From playlist Solve Proportions
This is a short video tutorial on equivalent ratios. β€ β€ β€ INTERACTIVE APPLETS AND WORKSHEETS β€ β€ β€ http://fearlessmath.net β€ β€ β€ FOLLOW ME ON TWITTER β€ β€ β€ http://twitter.com/dhabecker
From playlist All about ratios and proportions
Solving a proportion using the cross product ex 7, 8/5 = (4/3x)
π Learn how to solve proportions. Two ratios are said to be proportional when the two ratios are equal. Thus, proportion problems are problems involving the equality of two ratios. When given a proportion problem with an unknown, we usually cross-multiply the two ratios and then solve for
From playlist How to Solve a Proportion
Learn how to apply the cross product to solve the proportion ex 10, (x - 5)/4 = 3/2
π Learn how to solve proportions. Two ratios are said to be proportional when the two ratios are equal. Thus, proportion problems are problems involving the equality of two ratios. When given a proportion problem with an unknown, we usually cross-multiply the two ratios and then solve for
From playlist How to Solve a Proportion
Particle Physics (29 of 41) What is a Photon? 13. Mie Scattering
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain Mie scattering of photons scattering off large particles. Next video in the Particle Physics series can be seen at: http://youtu.be/4Lyf2zBSlCo
From playlist PHYSICS 65 PARTICLE PHYSICS
29. Island Biogeography and Invasive Species
Principles of Evolution, Ecology and Behavior (EEB 122) Geography is very important in ecology. Two major systems have been designed to model this, island biogeography and metapopulations. The idea of metapopulations is more recent, and has emerged as the dominant theory. Metapopulation
From playlist Evolution, Ecology and Behavior with Stephen C. Stearns
Mod-01 Lec-4 Diffraction Methods For Crystal Structures
Condensed Matter Physics by Prof. G. Rangarajan, Department of Physics, IIT Madras. For more details on NPTEL visit http://nptel.iitm.ac.in
From playlist NPTEL: Condensed Matter Physics - CosmoLearning.com Physics Course
This video introduces the Golden ratio and provides several examples of where the Golden ratio appears. http:mathispower4u.com
From playlist Mathematics General Interest
Scientists Uncover The Supernovae That Created the Solar System
I wrote a foreword for this awesome Sci-Fi book here: https://amzn.to/3aGrg0I Get a Wonderful Person shirt: https://teespring.com/stores/whatdamath Alternatively, PayPal donations can be sent here: http://paypal.me/whatdamath Hello and welcome! My name is Anton and in this video, we will
From playlist Solar System
PHYS 201 | Linear Polarizers 3 - The Polarizer
Here are some details on how we characterize linear polarizers, plus a bit on what "unpolarized light" means. -----Polarization playlist - https://www.youtube.com/playlist?list=PL9_sR6Qqqcyl7a3yVcQ4lH5zEh68psVqj -----Use the channel, or take the courses at edX - https://www.edx.org/course?
From playlist PHYS 201 | Polarization
Gigantism and the age of extinction | The Royal Society
Does gigantism always lead to extinction? π¦₯π§πAnd can the fossil record help us preserve the species on Earth today? Subscribe to our channel for exciting science videos and live events, many hosted by Brian Cox, our Professor for Public Engagement: https://bit.ly/3fQIFXB #extinction #giga
From playlist Inspiring science
Learn how to solve a proportion by applying the cross product ex 15, 15/(x+7) = 45/(x+21)
π Learn how to solve proportions. Two ratios are said to be proportional when the two ratios are equal. Thus, proportion problems are problems involving the equality of two ratios. When given a proportion problem with an unknown, we usually cross-multiply the two ratios and then solve for
From playlist How to Solve a Proportion
Lab evolution with e coli and yeast (Lecture - 02) by Paul Sniegowski
Winter School on Quantitative Systems Biology DATE:04 December 2017 to 22 December 2017 VENUE:Ramanujan Lecture Hall, ICTS, Bengaluru The International Centre for Theoretical Sciences (ICTS) and the Abdus Salam International Centre for Theoretical Physics (ICTP), are organizing a Winter S
From playlist Winter School on Quantitative Systems Biology
18. Major Events in the Geological Theatre
Principles of Evolution, Ecology and Behavior (EEB 122) Geology and climate have shaped the development of life tremendously. This has occurred in the form of processes such as the oxygenation of the atmosphere, mass extinctions, tectonic drift, and disasters such as floods and volcanic
From playlist Evolution, Ecology and Behavior with Stephen C. Stearns
Mutation, selection and evolutionary rescue in simple phenotype...(Lecture 3) by Guillaume Martin
PROGRAM FIFTH BANGALORE SCHOOL ON POPULATION GENETICS AND EVOLUTION (ONLINE) ORGANIZERS: Deepa Agashe (NCBS, India) and Kavita Jain (JNCASR, India) DATE: 17 January 2022 to 28 January 2022 VENUE: Online No living organism escapes evolutionary change, and evolutionary biology thus conn
From playlist Fifth Bangalore School on Population Genetics and Evolution (ONLINE) 2022
Learn to solve a proportion by determining & multiplying by LCD ex 14,(2xβ11)=5(xβ3)/11
π Learn how to solve proportions. Two ratios are said to be proportional when the two ratios are equal. Thus, proportion problems are problems involving the equality of two ratios. When given a proportion problem with an unknown, we usually cross-multiply the two ratios and then solve for
From playlist How to Solve a Proportion