2011-09-28, 16:35 | Link #161 | |
Rawrrr!
Join Date: Mar 2008
Location: CH aka Chocaholic Heaven
Age: 40
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Quote:
The whole point of the shaped charge design was to add inert reaction mass around the nuclear device, shaped in order to maximise propulsion efficiency.
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2011-09-28, 17:42 | Link #162 | |
Asuki-tan Kairin ↓
Join Date: Feb 2004
Location: Fürth (GER)
Age: 43
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Hm, maybe you miss something here... a thermonuclear device creates first and foremost heat and not pressure. The pressure is an indirect result of stuff that is expanding because of the tremendous heat. If you want to burn the nuclear fuel very efficiently/clean you have to burn it as hot as possible. The problem is, that inert mass needs to withstand the heat of the plasma. Even if the inert mass was large enough - so that not all of it was turned into plasma almost immediatly (and which can hardly be directed once it turned into plasma) it would be just too heavy to be carried as "propellant". The plasma will expand rather evenly in all directions (at least in vacuum and zero gravity). So increasing the power output of the charge when keeping the mass constant, means to lose the shaping effect.
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2011-09-28, 18:57 | Link #163 | |||
Rawrrr!
Join Date: Mar 2008
Location: CH aka Chocaholic Heaven
Age: 40
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Things that were devised by the very same breed of scientist that those who worked on the Orion project. Quote:
-radiations, ranging over the whole electromagnetic spectrum and further, and which distribution (IR, X-rays, neutrons) are tinkered with in multiple weapon designs. -pressure: the shockwave propagated in an atmospheric, liquid or solid environment by the expansion of the bomb's vaporized mass. Now, if a multistage nuclear device can hold itself during the preliminary explosions, why would't a reaction mass, shaped appropriately, fare similarly? I refer you to the wikipedia entry: Quote:
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Last edited by JMvS; 2011-09-28 at 19:21. |
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2011-09-29, 01:41 | Link #164 | |
Asuki-tan Kairin ↓
Join Date: Feb 2004
Location: Fürth (GER)
Age: 43
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Quote:
This however is more important for the way the fuel reacts internally. The result is the same, at the end the wohle device is vaporized. The heat/radiation (most of the radiation is transformed into heat because of particle interaction) will be way more significant then the actual shockwave created. So, since there is only a plasma shockwave, most of the energy of the explosion will be wasted in heat. If the device does not burn that clean, there would be more non-plasma matter in the shockwave, when those hit the absorbers it might actually provide more porpulsion even though the nuclear fuel is used less efficiently. However, in order to reduce the percentage of isotopes with longer half life times in the fallout you'ld try to burn the nucelar fuel as efficient as possible. Shaped thin plasma is imo inefficient for propulsion (especially in space). The effect of a thermonuclear device in space is primarily heat/radiation generation, there is no medium to transport shockwaves other than the selfgenerated plasma, that thins out rapidly when it is dispenses over a vast area. The thermobaric effect that adds to the plasma shockwave when the device is used in an atmosphere (air expands rapidly because of the vast/sudden heating) won't work in space. I mentioned in my first post about this, that it is not impossible to design such a shaped charge that can be used for propulsion... what I tried to say is that you cannot make it very clean/efficient because that would actually reduce the propulsion. To use dirty/inefficient shaped charges that generates lots of dangerous fallout would be good for propulsion and hence is ridiculous. And the part about the shaped reaction mass in the wikipedia article is just theory. The reaction mass that stays stable long enough to be shaped like that (Hohlladung) doesn't exist when the device is burning very clean/hot/efficient. It does exist when the device is rather dirty.
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Last edited by Jinto; 2011-09-29 at 02:16. |
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2011-09-29, 08:07 | Link #165 | |||
Rawrrr!
Join Date: Mar 2008
Location: CH aka Chocaholic Heaven
Age: 40
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Quote:
The point of the orion design is that of a pulsed reaction propulsion: the bombs would be launched at very short intervals, exploding at very short range behind the pusher plate. And actually, the smallest yields achievable were sought after, in order to increase their frequency. Quote:
Quote:
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Last edited by JMvS; 2011-09-29 at 08:57. |
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2011-09-29, 08:12 | Link #166 | |
Obey the Darkly Cute ...
Author
Join Date: Dec 2005
Location: On the whole, I'd rather be in Kyoto ...
Age: 66
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But there was a "request for proposal" sent out in the 80s for "a spherical device with sensors that could contain explosive pressures of <insert values for something equaling nuclear blast here>" --- reading the RFP, it was easy to see they were wanting something that would let them circumvent the air and underground testing bans.
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2011-09-29, 09:53 | Link #167 | |
NYAAAAHAAANNNNN~
Join Date: Nov 2007
Age: 35
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That is one hell of a ludicrous proposal.
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2011-09-29, 12:19 | Link #168 | ||
Asuki-tan Kairin ↓
Join Date: Feb 2004
Location: Fürth (GER)
Age: 43
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Hm, I see that work in theory, but I wouldn't bet my life on it. Quote:
Actually, in theory you could have the sensors looking from very far away at what is happening. Imagine a long pipe or rather a long conrete wall with a long but very thin bore hole, place a sensor device at its end... sometimes it is enough to know the situation in one tiny part of the whole system... to estimate what is going on in the entire thing.
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Last edited by Jinto; 2011-09-29 at 16:13. Reason: beim Namen der Zeitschrift hab ich mich wohl getäuscht... lang, lang ists her ^^' |
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2011-09-29, 13:17 | Link #169 | |
Obey the Darkly Cute ...
Author
Join Date: Dec 2005
Location: On the whole, I'd rather be in Kyoto ...
Age: 66
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More weeping for the pathetic excuse in the US we call the "telco/wireless" infrastructure
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(looks at my 2GB/month cap at $30USD added to total bill and just rolls his eyes... and then multiplies it by the 5 lines we have and gets grumpy since there's no "shared data option" in the "family plans"
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2011-09-29, 13:54 | Link #170 |
Gamilas Falls
Join Date: Feb 2008
Location: Republic of California
Age: 46
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A technical questionm someone posed to me today. What about all the reactants exhaust from our rockets and spacecraft? Could those cause us problems in the future? Not so much about those used in the atmosphere, but those used in space. Everything stays up there, like the explelled fuel used my the moon shots or course corrections,m or pushes to get out of Earth orbit by our probes.
Is there any danger to the stuff? Running into it? Reentry? That sort of thing.
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2011-09-29, 14:10 | Link #171 |
Not Enough Sleep
Join Date: Nov 2003
Location: R'lyeh
Age: 48
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http://www.slate.com/articles/techno...our_job_5.html
Katz is working on something he calls "quantitative legal prediction." Thousands of patent cases are filed every year in the United States. There's a good chance, then, that MicroWidget's case against you shares some similarities with a bunch of those other cases. What if you could analyze the key features of MicroWidget's claim, and then see how thousands of comparable cases fared? "Lawyers will be able to say to their clients, 'Here's what we think your chances are—and based on 10,000 cases that are just like yours, here's what the computer thinks your chances are,' " Katz explains. There is no machine that does this today, but it's coming. In the last piece, I examined the technology that's encroaching on journalism—computers are getting so skillful with language that they can now write stories all by themselves. But journalists are small fry; if you want to go after a profession that relies heavily on language, the deep-pocketed legal world is a fatter target. In the last few years, the law has seen a rush of technological innovation, all stemming from computers' increasing capacity to decipher and understand written documents. Many law firms now use "e-discovery" tools that can scan large caches of evidence in search of interesting facts and figures. Firms also have software to draft legal documents in a fraction of the time a human would take. And a few services on the horizon might do even more—negotiate the terms of a contract, for instance, or determine whether or not you should sue. Automation will bring legal services to the masses. Many people who ought to hire an attorney to handle business or personal disputes can't afford to do so. Software could potentially step in when you want to fight your mortgage lender, draw up contracts to start a small business, or sue for child-support payments. While legal automation will be a boon for those who can't afford representation, it's bad news for lawyers. The industry is already in a slump, and law school is no longer seen as a sure path to riches. Because software will allow fewer lawyers to do a lot more work, it's sure to drive down both price and demand.
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2011-09-29, 21:48 | Link #172 | |
Obey the Darkly Cute ...
Author
Join Date: Dec 2005
Location: On the whole, I'd rather be in Kyoto ...
Age: 66
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2011-09-30, 00:44 | Link #173 | |
NYAAAAHAAANNNNN~
Join Date: Nov 2007
Age: 35
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2011-09-30, 01:42 | Link #175 | |
NYAAAAHAAANNNNN~
Join Date: Nov 2007
Age: 35
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Quote:
Propellant is supposed to leave matter behind due to Newton's First and Third Laws, the force generated by the spewing of propellant moves the object in its desired direction. Fuel is a different thing, it powers something that generates a force to move something forward. So in the context of rockets using oxygen-hydrogen boosters, the fuels of oxygen and hydrogen are mixed and ignited to generate the propellant steam/water, which has the sufficient mass to generate a force, which is then used to drive an object in its direction desired. I am confused. "Matter-based propellants" sounds funny.
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2011-09-30, 01:54 | Link #176 | |
Asuki-tan Kairin ↓
Join Date: Feb 2004
Location: Fürth (GER)
Age: 43
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Quote:
Btw. in todays applied technology the inertia of matter is utilized to get an impulse for propulsion in space. If it were converted to pure energy the propulsion would be very inefficient (simple example - what produces more recoil [propulsion]: a) shooting a bullet with Ekin = 4 kJ or b) shooting a laser beam that releases energy in the form of light at E = 4kJ).
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Last edited by Jinto; 2011-09-30 at 03:03. |
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2011-09-30, 02:47 | Link #178 |
Obey the Darkly Cute ...
Author
Join Date: Dec 2005
Location: On the whole, I'd rather be in Kyoto ...
Age: 66
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Think of most rockets as unregulated diesel engined 18-wheeler heavy transport spewing crud, ash, soot, bits of metal, etc. Now think of total mass-energy conversion with hardly any residue... or solar sails... or laser sails... or rail guns... or space elevators... or back to closer reality, at least a much more efficient burn with lowered residue.
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2011-09-30, 07:28 | Link #179 | |
NYAAAAHAAANNNNN~
Join Date: Nov 2007
Age: 35
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2011-10-01, 18:43 | Link #180 | |
blinded by blood
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