Search found 876 matches

by krenshala
Sat Nov 04, 2017 1:28 pm
Forum: General
Topic: Diamond Is A Semiconductors Best Friend
Replies: 3
Views: 123

Re: Diamond Is A Semiconductors Best Friend

I see Johan's tongue is as sharp as ever. ;)
by krenshala
Fri Oct 27, 2017 12:31 pm
Forum: General
Topic: Diamond Is A Semiconductors Best Friend
Replies: 3
Views: 123

Re: Diamond Is A Semiconductors Best Friend

The descriptions in the article remind me of some of the descriptions Johan Prinn (am I remembering his name correctly?) gave for the work he was doing.
by krenshala
Thu Oct 26, 2017 9:20 pm
Forum: News
Topic: SpaceX News
Replies: 1930
Views: 180368

Re: SpaceX News

delta v = v_e * ln( wet mass / dry mass ) If we assume the lower (sea level) Isp of 330s for the raptors, and a 100 metric ton dry mass, then you would need 3020 metric tons of fuel to result in a delta v of 11126.31 m/s. If you change the Isp to the vacuum value (375s) and ignore the presence of a...
by krenshala
Fri Oct 20, 2017 12:12 pm
Forum: News
Topic: SpaceX News
Replies: 1930
Views: 180368

Re: SpaceX News

Even if flight time is bumped up to 1 or 2 hours to mitigate G stresses on the passengers, that would still be significantly better than aircraft for flights traveling more than 1/3 of the way around the globe, and possibly for some shorter distances.
by krenshala
Wed Oct 18, 2017 1:03 pm
Forum: News
Topic: SpaceX News
Replies: 1930
Views: 180368

Re: SpaceX News

Elon just finished an AMA over at Reddit ... perhaps a little tipsy while doing so. Skimming through the top level questions and responses and found this gem from Musk: The advantage of getting somewhere in 30 mins by rocket instead of 15 hours by plane will be negatively affected if "but also...
by krenshala
Fri Oct 13, 2017 9:48 pm
Forum: General
Topic: 2014 only the hottest year on the cooked books...
Replies: 62
Views: 6970

Re: 2014 only the hottest year on the cooked books...

Yes, it is currently spring in the Southern Hemisphere as of ~20 September.
by krenshala
Fri Oct 06, 2017 8:57 pm
Forum: News
Topic: EMC2 news
Replies: 279
Views: 37808

Re: EMC2 news

I am well aware that many people with computer science degrees are highly concerned about code efficiency. My point here is that while it may be desirable, it isn't essential for this purpose that the code be efficient. What is essential is that it gets the physics right, and if you accomplish that...
by krenshala
Wed Oct 04, 2017 10:58 pm
Forum: General
Topic: Skynet is coming.
Replies: 721
Views: 72763

Re: Skynet is coming.

ladajo wrote:The Germans had an HS 293 TV variant. I also think they had another weapon which used TV guidance, however I will have to dig.


It appears the Hs 293D had TV guidance, though the wiki page said it (and the wire-guided variant) did not reach operational status before the end of the war.
by krenshala
Wed Oct 04, 2017 5:40 pm
Forum: News
Topic: Neumann Drive
Replies: 4
Views: 285

Re: Neumann Drive

Checking the website, they list a number of different fuel types they have tried. I think I most enjoy the ones that didn't work. e.g., Bismuth . Bismuth was a material we had high hopes for. It has been used as propellant in other electric spacedrives, notably in the work done by Massey on Bismuth-...
by krenshala
Wed Oct 04, 2017 1:50 pm
Forum: General
Topic: Skynet is coming.
Replies: 721
Views: 72763

Re: Skynet is coming.

ladajo wrote:Germans had them first.

The V2, or something else? I'm guessing you are not referring to the V2 in this case.
by krenshala
Sat Sep 09, 2017 3:12 pm
Forum: General
Topic: Jerry Pournelle RIP
Replies: 7
Views: 339

Re: Jerry Pournelle RIP

Tom Ligon wrote:He will be missed, but he will not be forgotten anytime soon.


I cannot agree more with this, and with ladajo. That sucks.
by krenshala
Wed Aug 09, 2017 12:52 pm
Forum: News
Topic: Army discovers new energy source
Replies: 10
Views: 1012

Re: Army discovers new energy source

I wonder if this would be something where combining thermal-to-electric, in addition to the fuel-cell nature, would be worthwhile. The article states its an exothermic reaction, and one part says not a catalyst (which implies O2 is getting bound up in the Al powder) but another part mentions recombi...
by krenshala
Thu Aug 03, 2017 3:26 pm
Forum: News
Topic: LENR Is Real
Replies: 1764
Views: 143803

Re: LENR Is Real

To my mind the sudden declaration of a second, previously unspoken of, pump is directly equivalent to teh device having a second, previously unspoken of, power source. Fishy.
by krenshala
Thu Aug 03, 2017 12:29 pm
Forum: News
Topic: SpaceX News
Replies: 1930
Views: 180368

Re: SpaceX News

Is that sonic issue even with the (water) sound suppression system going?

Go to advanced search