The Fourier transform of a function of time, s(t), is a complex-valued function of frequency, S(f), often referred to as a frequency spectrum. Any linear time-invariant operation on s(t) produces a new spectrum of the form H(f)•S(f), which changes the relative magnitudes and/or angles (phase) of the non-zero values of S(f). Any other type of operation creates new frequency components that may be referred to as spectral leakage in the broadest sense. Sampling, for instance, produces leakage, which we call aliases of the original spectral component. For Fourier transform purposes, sampling is modeled as a product between s(t) and a Dirac comb function. The spectrum of a product is the convolution between S(f) and another function, which inevitably creates the new frequency components. But the term 'leakage' usually refers to the effect of windowing, which is the product of s(t) with a different kind of function, the window function. Window functions happen to have finite duration, but that is not necessary to create leakage. Multiplication by a time-variant function is sufficient. (Wikipedia).
Teach Astronomy - Spectral Lines
http://www.teachastronomy.com/ In physics there are two fundamentally different kinds of radiation that come from atoms. Thermal radiation is the result of the microscopic motions of atoms and molecules in a solid, a liquid, or a gas. Thermal radiation is smooth and continuous spanning a
From playlist 06. Optics and Quantum Theory
Light and Optics 7_2 Interference
Out of phase waves lead to interference.
From playlist Physics - Light and Optics
Teach Astronomy - Doppler Effect
http://www.teachastronomy.com/ The Doppler Effect is the shift of wavelength or frequency of a source of waves due to the motion of that source of waves. Doppler Effect is most familiar in terms of sound waves. As a source of sound, such as a siren, approaches you, the pitch or frequency
From playlist 06. Optics and Quantum Theory
A Better Approach to Spectral Analysis | Hear from MATLAB & Simulink Developers
Learn the reasons behind why using a channelizer-based filter bank for spectral analysis is superior to other methods. This video walks through what a channelizer-based filter bank is, and it explains the benefits of using it over other techniques, such as the window and FFT method (also k
From playlist Tips and Tricks from MATLAB and Simulink Developers
Advances in Quantum Spectral Estimation - L. Viola - PRACQSYS 2018 - CEB T2 2018
Lorenza Viola (Department of Physics and Astronomy, Dartmouth College, Hanover, USA) / 03.07.2018 Advances in Quantum Spectral Estimation Accurately characterizing the spectral properties of environmental noise in open quantum systems is both a prerequisite for quantitative modeling and
From playlist 2018 - T2 - Measurement and Control of Quantum Systems: Theory and Experiments
Virtualizing quantum errors: open-loop controls for (...) - M. Biercuk - PRACQSYS 2018 - CEB T2 2018
Michael Biercuk (ARC Centre for Engineered Quantum Systems, School of Physics, The University of Sydney, NSW Australia & National Measurement Institute, West Lindfield, Australia) / 06.07.2018 Virtualizing quantum errors: open-loop controls for noise characterization and modification of e
From playlist 2018 - T2 - Measurement and Control of Quantum Systems: Theory and Experiments
Teach Astronomy - Apparent Brightness
http://www.teachastronomy.com/ Apparent Brightness in astronomy is the number of photons per second collected at the Earth from an astronomical source. It depends on three things: First, the collecting area of the device used to observe the source of light. In the case of a telescope, t
From playlist 14. Stars
Fast, high fidelity control in spectrally crowded systems - S.Economou - PRACQSYS 2018 - CEB T2 2018
Sophia Economou (Department of Physics, Virginia Tech, Blacksburg, USA) / 03.07.2018 Fast, high fidelity control in spectrally crowded systems Quantum information technologies rely crucially on the ability to control quantum systems with unprecedented accuracy. There are inherent challen
From playlist 2018 - T2 - Measurement and Control of Quantum Systems: Theory and Experiments
Ariadna Murguia-Berthier - Implementing a tabulated EOS and neutrino leakage scheme in HARM3D
Recorded 5 October 2021. Ariadna Murguia-Berthier of the University of California, Santa Cruz present "Implementing a tabulated EOS and neutrino leakage scheme in HARM3D" at IPAM's Workshop I: Computational Challenges in Multi-Messenger Astrophysics. Abstract: On August 17, 2017, the LIGO/
From playlist Workshop: Computational Challenges in Multi-Messenger Astrophysics
Light and Optics 7_14 Thin Film Interference
The interefernce caused by reflection with a thin film.
From playlist Physics - Light and Optics
Reflections on BICEP2 - J. Bock - 5/17/2014
Workshop on Primordial Gravitational Waves and Cosmology (May 16 - 17, 2014) Learn more about this workshop: http://burkeinstitute.caltech.edu/workshops Produced in association with Caltech Academic Media Technologies. © 2014 California Institute of Technology
From playlist Walter Burke Institute for Theoretical Physics - Workshop on Primordial Gravitational Waves and Cosmology (May 16 - 17, 2014)
Inside the world of electro-opto-chemical things. UV sources, photomultipliers and lots of plumbing! Check my ebay listings for parts from these :http://www.ebay.co.uk/sch/mikeselectricstuff/m.html Manual for later 43B version of SO2 Analyzer : http://pas.ce.wsu.edu/CE415/SO2_TECO_43B.pd
From playlist Teardowns
Suhasini Subba Rao: Reconciling the Gaussian and Whittle Likelihood with an application to ...
In time series analysis there is an apparent dichotomy between time and frequency domain methods. The aim of this paper is to draw connections between frequency and time domain methods. Our focus will be on reconciling the Gaussia likelihood and the Whittle likelihood. We derive an exact,
From playlist Virtual Conference
Interpreting Intensity Mapping Data - Switzer - Workshop 2 - CEB T3 2018
Eric Switzer (NASA GSFC) / 25.10.2018 Interpreting Intensity Mapping Data ---------------------------------- Vous pouvez nous rejoindre sur les réseaux sociaux pour suivre nos actualités. Facebook : https://www.facebook.com/InstitutHenriPoincare/ Twitter : https://twitter.com/InHenriPo
From playlist 2018 - T3 - Analytics, Inference, and Computation in Cosmology
Quantum tunneling explained with 3D simulations of Schrodinger’s equation for quantum wave functions. My Patreon page is at https://www.patreon.com/EugeneK
From playlist Physics
Use of PLUTO code for High Energy Astrophysical Problems by Bhargava Vaidya
06 March 2017 to 17 March 2017 VENUE: Ramanujan Lecture Hall, ICTS Bangalore Particle accelerators have been instrumental in unraveling some of the deep questions related to matter at the fundamental level, the latest being discovery of the Higgs Boson. The conventional accelerators, how
From playlist Laser Plasma Accelerator