Search found 590 matches

by Wilfried Heil
Sat May 02, 2015 7:18 pm
Forum: Announcements and Administration Archive
Topic: Happy ULTIMATE pi day
Replies: 6
Views: 2336

Re: Happy ULTIMATE pi day

Nope. They're still waiting for April 31th.
by Wilfried Heil
Mon Sep 10, 2012 12:49 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Is there any possible replacement for platinum wire in the electrolysis process?
Replies: 10
Views: 2374

Re: Is there any possible replacement for platinum wire in the electrolysis process?

<r>> But wouldn't the carbon electrode contaminate the D2O solution and be carried by air vapor when the D20 solution bubbles ?<br/> No. The pencil mines are made of a mixture of carbon and clay. They have a tendency to flake off during electrolysis, but all of that stays in the water. You can use a...
by Wilfried Heil
Mon Sep 10, 2012 11:23 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Is there any possible replacement for platinum wire in the electrolysis process?
Replies: 10
Views: 2374

Re: Is there any possible replacement for platinum wire in the electrolysis process?

<t>Certainly. You can use carbon electrodes from a pencil or from the inside of an old AA size battery. They will produce a black slurry in the water during electrolysis, which shouldn`t matter for this purpose.<br/> <br/> You can get any number of dead batteries from the collection box in a departm...
by Wilfried Heil
Thu May 03, 2012 10:22 am
Forum: Vacuum Technology (& FAQs)
Topic: Baratron
Replies: 12
Views: 3060

Re: Baratron

<t>There is an alternative, also from MKS. The MicroPirani 925 Series is a micromachined Pirani gauge that can measure in the lower millitorr region. The advantage is that it will work from atmosphere down to fusion pressure. It has just the right pressure range for a fusor, where the working pressu...
by Wilfried Heil
Sun Jan 15, 2012 5:06 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Soundcard-MCA using Ludlum Model 3 (+NaI(Tl))
Replies: 7
Views: 2847

Re: Soundcard-MCA using Ludlum Model 3 (+NaI(Tl))

<r>Here is the manual for the Model 3, which includes a full schematic.<br/> <br/> You can pick off the pulses at pin 3 of the "accessory connector" P2. <br/> Pins 2 and 6 are GND. (See p. 33 of the manual).<br/> <br/> These are digital pulses only, useful for counting. The sound signal which goes t...
by Wilfried Heil
Mon Oct 10, 2011 7:57 pm
Forum: Announcements and Administration Archive
Topic: Fireballs over the Mekong River
Replies: 2
Views: 1400

Re: Fireballs over the Mekong River

<r>There has been a comprehensive study since 2002, coordinated by Saksit Tridech of the Ministry of Natural Resources and Environment of Thailand. Unfortunately, he died in a helicopter crash last year, shortly before the event. I don't know if any additional results from this study have been publi...
by Wilfried Heil
Sat Oct 08, 2011 8:41 pm
Forum: Announcements and Administration Archive
Topic: Deuterium on Venus
Replies: 9
Views: 2133

Re: Deuterium on Venus

Stars don't make additional deuterium, they burn it up very fast.
Practically all the deuterium in the universe is considered to be of primordial origin.
by Wilfried Heil
Fri Oct 07, 2011 7:20 pm
Forum: Announcements and Administration Archive
Topic: Deuterium on Venus
Replies: 9
Views: 2133

Deuterium on Venus

<r>There isn't much water on Venus, but that contains 120x more deuterium than the water on earth. <br/> Interesting how this can be seen and quantified from an earth observatory. - Science 1991<br/> <br/> <URL url="http://www.sciencemag.org/content/251/4993/547.full.pdf">http://www.sciencemag.org/c...
by Wilfried Heil
Fri Oct 07, 2011 5:28 pm
Forum: Announcements and Administration Archive
Topic: Fireballs over the Mekong River
Replies: 2
Views: 1400

Fireballs over the Mekong River

<t>In October 2010, Noemi and I had the opportunity to observe the Bung Fai Paya Nak (Naga fireballs) near Rattana Wapi in Northern Thailand. Small orbs of light rise from the waters in a 300 km long stretch of the Mekong near Vientiane, Laos and in the province of Nong Khai in Thailand. This phenom...