Why is Coax 50 Ohms? (#340) at https://www.youtube.com/watch?v=I-OnQZJv35I Thanks! Your explanation of 50 ohm cables was very helpful. I wrote a long comment about vacuum impedance you might find interesting. Richard Collins, The Internet Foundation I was going over transmission line theories and trying to get a better feeling for the vacuum impedance which CoData gives
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Real Capacitors at https://www.youtube.com/watch?v=hlmPFbHTHTw Sabrina Koffler, You could easily have shown the behavior of a few “real” capacitors as a function of frequency. And added a variable resistance and inductance to show the effects of changing those. Design, testing, measurement is all about numbers, data collection. More and more that also means models, algorithms, comparison between
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Twitter comment on Physical Review Letters @PhysRevLett Feb 13 Measurement of the Electron Magnetic Moment to 0.13 parts per trillion (replacing a limit from 14 years ago). Letter: https://go.aps.org/3E3jjSX Viewpoint: https://go.aps.org/3xfgeLT Replying to @PhysRevLett — One of my favorite experiments. Thanks. I particularly like “according to quantum physics, the vacuum is teeming with virtual particles”. Except I
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https://www.researchgate.net/publication/359389325_ON_THE_NORMAL_HEIGHT_DIFFERENCES_DETERMINATION_FROM_GEOPOTENTIAL_DIFFERENCES/comments Using real time comparisons via electromagnetic signals gets more complicated. Trying to use high speed storage of the signals gets memory intensive and expensive. As much of the data is nearly the same. The reason I used the vector tidal gravity signals for calibration and standardization is that each location can compare to
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Low Cost, Time-of-Flight Gravimeter Arrays https://hackaday.io/project/164550-low-cost-time-of-flight-gravimeter-arrays More information posted at ResearchGate on 3 axis gravimeters RichardCollins • 07/19/2022 at 17:15 • 0 comments My main “job” is the Internet Foundation, so I am constantly monitoring global issues, methods and activities on the Internet. But I have a heart for research groups and gravitational noise detector
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Measurement of the electron affinity of lead and its isotope shifts at https://journals.aps.org/pra/abstract/10.1103/PhysRevA.106.L010801 Physical Review A @PhysRevA 3h Letter: Measurement of the electron affinity of lead and its isotope shifts @DenisonU @vassalloef https://go.aps.org/3BkBPpl https://pic.twitter.com/zVlUBLp75Z Replying to @PhysRevA @DenisonU and @vassalloef Looks like a lovely and precise study. I have been following “electron affinity” for years.
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Physical Review Letters @PhysRevLett Jul 25 A trapped nanoparticle interacting with a laser provides a simple way to generate squeezed light which has an unusually low level of fluctuations. Letter: https://go.aps.org/3oqYPeL Letter: https://go.aps.org/3ovQNkS Focus: https://go.aps.org/3orRYBw https://pic.twitter.com/pPDdsp2Rb5 Extra-Stable Light Produced by Levitated Nanoparticle How long can the nanoparticle be monitored? Can you track it closely for
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Nanofocused x-ray photon correlation spectroscopy – Data link broken thru DOI.org https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.4.L032012 Fivos Perakis, I was reading your article and wanted to look at the data, but the link is broken. And the DOI system form to report the error is also broken. The DOI form appears but accepts no input. In the PDF: “The
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This intro added 10 Jul 2022 in update to “Solar System Gravimetry and Gravitational Engineering ” Comment on “MegaAmpere to MegaGauss” – Using laser fluctuations to measure gravitational potential turbulence To generate intense fields to control the motion of matter. To emulate gravitational acceleration so precisely there is almost no error in position or other
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Everyone, I am including this as an update to this project because the routine laboratory and wide area measurement of the speed of the gravitational potential is critical to all the groups working together. You HAVE to be able to measure the signals at high enough sampling rates to get good correlations and comparisons. For
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