Search found 2784 matches

by Giorgio
Wed Mar 03, 2010 11:50 am
Forum: News
Topic: Water on the moon
Replies: 23
Views: 4692

One perfectly good use for the oxygen: reaction mass. At the same specific impulse in an ion engine, oxygen (single electron removal) requires 1/16th the current as hydrogen to produce the same thrust, though the drive voltage will need to be 16 times that of hydrogen. (603kA, 187kV vs 9.6MA, 11.7k...
by Giorgio
Wed Mar 03, 2010 11:32 am
Forum: General
Topic: VASIMR
Replies: 127
Views: 16417

It takes energy to raise the temperature of an object. It doesn't matter if you are pumping the heat or just injecting it (you do get some help when pumping it). That energy has to come from the plant making the heat. That's obvious, the trick is in balancing the system with enough new technologies...
by Giorgio
Wed Mar 03, 2010 10:29 am
Forum: General
Topic: VASIMR
Replies: 127
Views: 16417

You have heat left from the first cycle (power plant) that you just use as a source to power a second/third /fourth power plant each one reducing the amount of heat that must be radiated as waste. You don't understand Carnot. Maximum efficiency is : 1 - Tc/Th I think I do understand pretty well Car...
by Giorgio
Tue Mar 02, 2010 12:35 pm
Forum: General
Topic: Earth's magnetic reversals, and risks..
Replies: 31
Views: 3891

The dinosaurs were done in by external events (asteroid). Their demise is rather irrelevant. Scientific hypotesis range from asteroid to vulcanic activity. For what I know up to today there is no relevant proof for one or the other. I read recently that it actually was proven (crater found, even). ...
by Giorgio
Tue Mar 02, 2010 11:47 am
Forum: General
Topic: Earth's magnetic reversals, and risks..
Replies: 31
Views: 3891

The dinosaurs were done in by external events (asteroid). Their demise is rather irrelevant. Scientific hypotesis range from asteroid to vulcanic activity. For what I know up to today there is no relevant proof for one or the other. Successful is as simple as "can breed fast enough for its populati...
by Giorgio
Tue Mar 02, 2010 11:35 am
Forum: General
Topic: VASIMR
Replies: 127
Views: 16417

The reactor is small. It is the radiators that are the problem. True, even if recent advancments in metamaterias and new understandings in the working of "highly mismatched alloys" might soon greatly reduce the need for radiators thanks to new generations of Peltier-Seebeck cells. http://www.scienc...
by Giorgio
Tue Mar 02, 2010 8:43 am
Forum: General
Topic: Earth's magnetic reversals, and risks..
Replies: 31
Views: 3891

We have been sucesfull in doing what? Surviving? Numerical survival is irrelevant. You are trivialising life itself. Animals are not "alive" that are not sentient. "Life" is a sentient act. The main difference between humans and the rest of the animals of this world is that humans are driven by "gr...
by Giorgio
Tue Mar 02, 2010 7:28 am
Forum: General
Topic: Earth's magnetic reversals, and risks..
Replies: 31
Views: 3891

We have been successfully in doing what? Surviving? Just for the love of making an example, ants and mosquitos have been on this planet from much before than our race, and will be probably on this planet much after our departure. Thats easy...The true measure of a species success is the number of B...
by Giorgio
Mon Mar 01, 2010 2:13 pm
Forum: General
Topic: Earth's magnetic reversals, and risks..
Replies: 31
Views: 3891

Due to the size of the universe this type of planetarty extinction events are probably at the order of the day, and I think that no one will relly care if humanity ceases to exist from one day to the other (humanity apart that is). After all, until now, we have not been that succesfull race we beli...
by Giorgio
Mon Mar 01, 2010 8:52 am
Forum: General
Topic: Earth's magnetic reversals, and risks..
Replies: 31
Views: 3891

True, the more quick the timescale of the event, the less the survivors will be. If the timescale is quick enough than humanity will simply cease to exist and (if the conditions will permit it) something new will come out from the mud of this planet. Due to the size of the universe this type of plan...
by Giorgio
Mon Mar 01, 2010 8:05 am
Forum: General
Topic: Earth's magnetic reversals, and risks..
Replies: 31
Views: 3891

The individual who dies will learn from his death but "will not" be able to apply that knowledge a second time.
The others that survive will.

Like it or not, this is the way that species evolve.
by Giorgio
Mon Mar 01, 2010 8:02 am
Forum: News
Topic: Polywell FOIA
Replies: 475
Views: 115024

I second KitemanSA offer too.
by Giorgio
Mon Mar 01, 2010 7:13 am
Forum: General
Topic: VASIMR
Replies: 127
Views: 16417

Where are we going to get a 200MW (megawatt) space nuclear reactor? Won't that be freakishly huge? The reactor is small. It is the radiators that are the problem. True, even if recent advancments in metamaterias and new understandings in the working of "highly mismatched alloys" might soon greatly ...
by Giorgio
Mon Mar 01, 2010 6:59 am
Forum: General
Topic: Bill Gates & the Traveling Wave Reactor at TED
Replies: 7
Views: 3183

Even if we will have a cheap fusion solution the travelling wave reactor will be a good middle term solution to burn most of the spent nuclear fuel that is available today.
by Giorgio
Fri Feb 26, 2010 7:01 am
Forum: News
Topic: LPP fusion experiments getting ten times more neutrons
Replies: 57
Views: 22380

IMHO, this answer is giving no clues, neither positive nor negative.