Search found 995 matches

by Rich Feldman
Tue Oct 23, 2018 12:39 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: How to test the quality of heavy water (D2O)?
Replies: 7
Views: 142

Re: How to test the quality of heavy water (D2O)?

Oh what fun, infrared spectra of water! Here's an animated gif v1.gif from http://www1.lsbu.ac.uk/water/water_vibrational_spectrum.html, which lists wavenumbers for 12 isotopically different kinds of water. Here's another reference: https://analusis.edpsciences.org/articles/analusis/pdf/1999/06/hein...
by Rich Feldman
Mon Oct 22, 2018 4:51 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: How to test the quality of heavy water (D2O)?
Replies: 7
Views: 142

Re: How to test the quality of heavy water (D2O)?

Roberto, thank you for posting the infrared spectrum plot. A thing I hadn't seen before. Anybody know if gaseous D2, H2, HD mixtures can easily be assayed by absorbtion or emission spectra? Here's a warning for conventional density measurements, even with a picnometer. They say D2O is very hygroscop...
by Rich Feldman
Sat Oct 20, 2018 7:56 pm
Forum: FAQs: Vacuum Technology
Topic: #4 FAQ: vacuum gauges - pressure measurements
Replies: 6
Views: 12492

Re: #4 FAQ: vacuum gauges - pressure measurements

Oops, compelled to correct a rare mis-statement by John. One bar is exactly 10^5 pascals. Most meteorologists use millibars to measure, record, and forecast natural air pressure. The "standard" pressure at sea level is 1013.25 millibars. This month's devastating Hurricane Michael had surface pressur...
by Rich Feldman
Fri Oct 12, 2018 8:11 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Frequency effect in the operation of a MOT.
Replies: 4
Views: 501

Re: Frequency effect in the operation of a MOT.

Welcome, Cai. Nice work there, measuring the transformer with different resistive loads. Then reporting with a well-labeled chart (and excellent written English). Did you make sure the primary voltage was constant during your frequency sweeps? Have you tried making a circuit model of the transformer...
by Rich Feldman
Wed Oct 10, 2018 12:02 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: neutron chiller exhibit
Replies: 0
Views: 253

neutron chiller exhibit

Today I had the good fortune to visit NIST in Gaithersburg, MD, for a technical seminar. It would have taken a lot more advance planning, maybe even a letter of recommendation, to be allowed into NIST Center for Neutron Research. But there are some cool places open to badged but otherwise unescorted...
by Rich Feldman
Tue Oct 09, 2018 11:32 pm
Forum: Images du Jour
Topic: HEAS 2018 Event Photos - Comments
Replies: 11
Views: 544

Re: HEAS 2018 Event Photos - Comments

Here are a few more.
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Some folks did not go to dinner, but cooked out on Richard's front lawn.
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T.R. Leary's Bismuth crystals.
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T.Even back by the lab, out into the lawn, more goodies.
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A typical small discussion conclave, of which, there were many.
by Rich Feldman
Sun Oct 07, 2018 10:40 pm
Forum: Images du Jour
Topic: Bullitt 50th anniversary
Replies: 0
Views: 156

Bullitt 50th anniversary

Hey Richard, you showed us pictures of your fast cars. Now I can't find your phone number. bullitt.jpg . Tonight and on Tuesday, there are nationwide screenings of Bullitt movie on its 50th anniversary. 2pm and 7 pm, at least in Eastern time. Incl. Regal Virginia Center 20, a stone's throw from Texa...
by Rich Feldman
Sun Oct 07, 2018 7:23 pm
Forum: Fusion --- Past, Present, and Future
Topic: Shine - a real use for fusion, now!
Replies: 23
Views: 6435

Re: Shine - a real use for fusion, now!

Back to the nominal subject of this thread: Looks like Shine has continued its dash through the approval, funding, planning, and construction process. Here's a NYT article from January, https://www.nytimes.com/2018/01/12/business/moly-99-radioactive-isotope-wisconsin.html. Well maybe not that fast -...
by Rich Feldman
Sun Oct 07, 2018 3:37 pm
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Fusors and Maxwell's Equations
Replies: 2
Views: 385

Re: Fusors and Maxwell's Equations

Sounds like a good idea, Nicolas. I had the minor misfortune, in college, of being placed a year ahead in math with respect to physics. Divergence and curl of vector fields were just operations to remember and practice. Next year, in the context of electromagnetism, they immediately made sense. Beca...
by Rich Feldman
Sun Oct 07, 2018 6:45 am
Forum: Fusion --- Past, Present, and Future
Topic: Shine - a real use for fusion, now!
Replies: 23
Views: 6435

Re: Shine - a real use for fusion, now!

This came up again at HEAS today, consequent to discussion about Bert Hickman, electron implantation in acrylic slabs, and video from a shielded camera on the train of carts rolling through tunnel of irradiation. Andrew, once again I couldn't find the remembered video: looking down into a tank of ur...