Vector calculus

Noise-equivalent flux density

In optics the noise-equivalent flux density (NEFD) or noise-equivalent irradiance (NEI) of a system is the level of flux density required to be equivalent to the noise present in the system. It is a measure used by astronomers in determining the accuracy of observations. The NEFD can be related to a light detector's noise-equivalent power for a collection area A and a photon bandwidth by: , where a factor (often 2, in the case of switching between measuring a source and measuring off-source) accounts for the photon statistics for the mode of operation. (Wikipedia).

Video thumbnail

Physics - E&M: Ch 40.1 Current & Resistance Understood (17 of 17) What is Current Density? Ex.

Visit http://ilectureonline.com for more math and science lectures! In this video I will find the current density, J=?, given current, I=4amps, and diameter, D=2mm. First video in this series can be seen at: https://youtu.be/bDe4lzgQY2E

From playlist THE "WHAT IS" PLAYLIST

Video thumbnail

Physics - Mechanics: Sound and Sound Waves (36 of 47) Intensity of Sound Wave 2

Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to calculate the intensity of sound wave 2.

From playlist PHYSICS MECHANICS 5: WAVES, SOUND

Video thumbnail

Physics - E&M: Ch 40.1 Current & Resistance Understood (16 of 17) What is Current Density?

Visit http://ilectureonline.com for more math and science lectures! In this video I will explain the current density, for example, of a conductor of a given current (I) and current density (J) is defined as the amount of current per unit area. Next video in this series can be seen at: ht

From playlist THE "WHAT IS" PLAYLIST

Video thumbnail

Physics - Mechanics: Sound and Sound Waves (35 of 47) Intensity of Sound Wave 1

Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to calculate the intensity of sound wave.

From playlist PHYSICS MECHANICS 5: WAVES, SOUND

Video thumbnail

Physics 40 Resistivity and Resistance (12 of 32) Current Density of a Conductor

Visit http://ilectureonline.com for more math and science lectures! In this video I will find the current density of a conductor.

From playlist PHYSICS 40 RESISTIVITY AND RESISTANCE

Video thumbnail

Magnetic flux density measured for beginners: from fizzics.org

The strength of a magnetic field or the flux density can be measured using a simple balance to measure the force produced by a known opposing field. The video demonstrates this measurement using simple equipment and follows through with a calculation of the answer. Notes on measuring magne

From playlist Magnetism and electromagnetism

Video thumbnail

Sound vs. Noise: What’s the Actual Difference? (Part 1 of 3)

Noise and sound are not the same thing… really, they aren’t! What exactly is noise? Part 2 of 3 - https://youtu.be/XhFhK97hrdY Part 3 of 3 - https://youtu.be/yTyYZFcxGGQ Read More: Signal-to-Noise Ratio and Why It Matters https://www.lifewire.com/signal-to-noise-ratio-3134701 “You

From playlist Seeker Plus

Video thumbnail

Physics - Mechanics: Sound and Sound Waves (13 of 47) Sound Intensity at a Distance

Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to calculate I=? at distances of 10m, 1000m, and 10,000m.

From playlist PHYSICS MECHANICS 5: WAVES, SOUND

Video thumbnail

Physics - Mechanics: Sound and Sound Waves (9 of 47) Decibel Scale Conversion

Visit http://ilectureonline.com for more math and science lectures! In this video I will show you how to convert from decibel to W/m^2 and vice versa.

From playlist PHYSICS MECHANICS 5: WAVES, SOUND

Video thumbnail

Stochastic Astrophysical Foreground from Compact Binary Mergers (Lecture 1) by Vuc Mandic

PROGRAM ICTS SUMMER SCHOOL ON GRAVITATIONAL-WAVE ASTRONOMY (ONLINE) ORGANIZERS: Parameswaran Ajith (ICTS-TIFR, India), K. G. Arun (CMI, India), Bala R. Iyer (ICTS-TIFR, India) and Prayush Kumar (ICTS-TIFR, India) DATE : 05 July 2021 to 16 July 2021 VENUE : Online This school is part

From playlist ICTS Summer School on Gravitational-Wave Astronomy (ONLINE)

Video thumbnail

Benjamin Seibold: "Basic Traffic Models and Traffic Waves" (Part 2/2)

Watch part 1/2 here: https://youtu.be/9_1cEtimRNE Mathematical Challenges and Opportunities for Autonomous Vehicles Tutorials 2020 "Basic Traffic Models and Traffic Waves" (Part 2/2) Benjamin Seibold - Temple University Institute for Pure and Applied Mathematics, UCLA September 17, 2020

From playlist Mathematical Challenges and Opportunities for Autonomous Vehicles 2020

Video thumbnail

A clock containing a massive object in a superposition of states; what makes... by Tjerk Oosterkamp

21 November 2016 to 10 December 2016 VENUE Ramanujan Lecture Hall, ICTS Bangalore Quantum Theory has passed all experimental tests, with impressive accuracy. It applies to light and matter from the smallest scales so far explored, up to the mesoscopic scale. It is also a necessary ingredie

From playlist Fundamental Problems of Quantum Physics

Video thumbnail

Collisionless Dynamics and Smoothed Particle Hydrodynamics, Part 5 - Volker Springel

Collisionless Dynamics and Smoothed Particle Hydrodynamics, Part 5 Volker Springel Max Planck Institute for Astrophysics July 23, 2009

From playlist PiTP 2009

Video thumbnail

Tobias Ried - Optimal Transportation, Monge–Ampère, and the Matching Problem

We present a fully variational approach to the regularity theory for the Monge-Ampère equation, or rather of optimal transportation, with interesting applications to the problem of optimally matching a realisation of a Poisson point process to the Lebesgue measure. Following De Giorgi’s st

From playlist Research Spotlight

Video thumbnail

Hybrid quantum/classical computing on a 19-qubit (...) - N. Didier - PRACQSYS 2018 - CEB T2 2018

Nicolas Didier (Rigetti Computing, Berkeley, USA) / 04.07.2018 Hybrid quantum/classical computing on a 19-qubit processor based on parametrically-activated entangling gates Superconducting devices are one of the most promising platforms for building quantum computers, but demonstrating f

From playlist 2018 - T2 - Measurement and Control of Quantum Systems: Theory and Experiments

Video thumbnail

AQC 2016 - Origin and Suppression of 1/f Magnetic Flux Noise

A Google TechTalk, June 28, 2016, presented by Robert McDermott (University of Wisconsin - Madison) ABSTRACT: Magnetic flux noise is a dominant source of dephasing and energy relaxation in superconducting qubits. The noise power spectral density varies with frequency as 1/f and spans 13 o

From playlist Adiabatic Quantum Computing Conference 2016

Video thumbnail

Quantum Transport, Lecture 18: Coupled Qubits

Instructor: Sergey Frolov, University of Pittsburgh, Spring 2013 http://sergeyfrolov.wordpress.com/ Summary: experiments on two and more coupled flux qubits, transmons, and spin qubits. Quantum Transport course development supported in part by the National Science Foundation under grant DM

From playlist Quantum Transport

Video thumbnail

MagLab User Summer School: The Physics of Noise and Musings of Experimental Errors

This video was recorded in 2016 at the National MagLab’s annual User Summer School, where early-career scientists learn from lab experts best practices for conducting experiments at the lab. For more information, please visit https://nationalmaglab.org/user-summer-school

From playlist User Summer School Talks

Video thumbnail

Potential Difference Between Two Points In an Electric Field - Current Density & Resistivity

This physics video tutorial explains how to calculate the potential difference between two points in an electric field on a metallic conductor. It also explains how to calculate the current density given the electric current and the diameter of the material. The current density is equal

From playlist New Physics Video Playlist

Related pages

Noise-equivalent power | Flux