Category: Symbolic Mathematics

Comment on Industrial applications of pulsed power technology

https://www.researchgate.net/publication/3340967_Industrial_applications_of_pulsed_power_technology_IEEE_Trans_Dielecrt_Electr_Insul/comments Thanks for gathering this together. But the last decades or so, the cost of high power, high dI/dt controls has dropped considerably – drones, 3D printers, PWM servos, robotics, vehicles. I have only looked at a few areas so far. What you sort of missed was the sensor and control and modeling side. Atmospheric
Read More »

Models at CCMC, Vitmo ModelWeb Browser Results, Fundamental constants and equations used

Hello, I was enjoying your model site.  One of the better ones on the Internet in terms of ease of use and clarity. The only thing that I would like different is to have parameters in the generated URL, so that I can bookmark a run and go back to it again, without manually entering
Read More »

Jimmy Wales thanked me for my donation to support the current Wikipedia. Here is what I wrote back

Jimmy, I would like to make some specific recommendation for upgrading wikipedia to be more useful globally. But I doubt your organization is set up so that a “reply to a message from the founder” ever gets read and treated seriously. My time and skills are far more valuable than any money donation. But only
Read More »

Comment on Jordan Sullivan, Neutrinos and Antimatter Video

Neutrinos and antimatter at https://www.youtube.com/watch?v=YcpNhPBxwfo Jordan, You can combine a particle and its anti-particle into a stable form, if you provide angular momentum. The external charge and magnetic dipole moments are effectively zero, and the particle is effectively all binding energy which has no mass. The pair can store most any amount of energy, but
Read More »

Comment on video about the solar interior – another way, with the whole human species working together

What Does The Inside Of The Sun Look Like? https://www.youtube.com/watch?v=8ayHXTnN4fk In the visualization from 3:00 to 4:00, I think there should be small particles coming from every point to every point in the detector. For instance something coming from the far upper right. to the far lower left. Not just radially outward from one point
Read More »

Comment on Downwind Faster Than the Wind by Veritasium, How Does it Work?

Downwind Faster Than the Wind by Veritasium: How Does it Work? https://www.youtube.com/watch?v=CkhBskovitQ A good quantitative simulation does not need words, and the process of design is more efficient, not maintaining an inaccurate word model alongside the simulation. The words will always be ambiguous, but the model can be calibrated and fit to measurements from the
Read More »

Emoji languages – symbols and communication

Emily, Humans and animals with eyes are pretty good at quickly identifying things seen in the past.  It is a basic survival skill.  “Identify the person”, “Identify the weapon”, “Identify the ripe fruit”. So when training populations for basic survival, you probably have to go back to “Identify and classify quickly” – if you value
Read More »

Comment on Chain Fountain videos

Chain Fountain 2 – Drill powered spool https://www.youtube.com/watch?v=bcsb1xAv7XA When the beads are in a jar, they have a vertical component of velocity to go up and over the rim, so the beads trajectory follows gravity. Since stress travels through the beads much faster than the beads themselves, the force of the faster beads in the
Read More »

Broken Links on PCMDI.LLNL.gov – Global Climate Change Models

Karl, Here are some notes on broken links and bad practices.  I put notes on my search for climate models.  I do these rough searches to get started on a complete review of a topic group on the Internet.  Picking a hard enough problem at global scale is the only way to stay organized and
Read More »

Comments on a video tour of Cern’s Atlas facility

360° tour: ATLAS Experiment – Inside CERN’s largest detector! https://www.youtube.com/watch?v=On1WbLKP8DA Dear Atlas at Cern: There are two purposes for a video like this. One is to simulate what physical visitors do and see if they ever have a chance to visit. You show the parking lot, door, elevator, tunnels, and things. You show things from
Read More »