The problem with mechanical impacting is that that's how you got the dust in the first place, meteorite impacts. If you impact hard enough to leave a decent size crater you generate enough dust to cover the surface up again. As for your portable anti tank weapon, that's based on a hollow charge, it's exactly the wrong type of explosive. You want something that sets free a large amount of gas to push the regolith out of the way, not something that's build to concentrate all its energy in a very fast chunk of liquefied copper that burns through steal but just gets absorbed in the dust. A sodium azide charge might do the trick (the stuff they use in car air bags), a nice bang that doesn't deposit a lot of energy in the material and makes more dust.
Not enough sugar in the coffee this morning? The issues of drilling on the moon are nothing you've ever seen on earth, and none are related to the lower gravity.
A few facts (I know, you don't bother with them):
Your surface temperature fluctuates from -220 C to + 110 C, with 150 C difference being a good guess for most locations. There are no lubricants that will work over that range, and none that work at -220 C.
You have no atmosphere to cool your drill motor, or blow the highly abrasive regolith dust off your seals and bearings.
You can't drill using the standard slurry approach to move your debris out of the hole.
Your nearest spare parts are 300,000 miles away, and there's no one to loosen that lug nut.
You have a very limited power supply from solar cells, and any dust you allow to get on the cells you will not be able to remove.
For an easy challenge, try digging a hole in the middle of the Antarctic plateau, middle of winter, with a golf cart full of supplies, and a 5 kW generator for power. Remotely controlled.
Two problems, the regolith is about the the consistency of flour (somewhere in the 50 micron particle size). So you basically are trying to drill a hole in a flour silo, without being able to us the walls for support. It's also highly abrasive, and you're drilling dry, with the bits at rather low temperature (enhancing the brittleness of the drill bit).
And what your you using to blast with? I'm sorry, but your leaf blower doesn't work very efficiently at 10^-12 torr. You could use something similar to the ascend rockets they used on the lunar module (that set off the dust clouds that set of the "fake, fake" cries), but the regolith is several feet deep, so you need one hell of a blast there. You're actually better off to coat large areas with a very thin layer of binder, and keep the dust down that way.
will do, in the meantime, your homework assignment
crater (krtr)
1. A bowl-shaped depression at the top of a volcano or at the mouth of a geyser. Volcanic craters can form because of magma explosions in which a large amount of lava is thrown out from a volcano, leaving a hole, or because the roof of rock over an underground magma pool collapses after the magma has flowed away.
2. A shallow, bowl-shaped depression in a surface, formed by an explosion or by the impact of a body, such as a meteorite.
creator
1. Creator - terms referring to the Judeo-Christian God
Almighty, Divine, God Almighty, Godhead, Lord, Maker, Jehovah
Blessed Trinity, Holy Trinity, Sacred Trinity, Trinity - the union of the Father and Son and Holy Ghost in one Godhead
hypostasis of Christ, hypostasis - any of the three persons of the Godhead constituting the Trinity especially the person of Christ in which divine and human natures are united
I don't know if to mod this funny for a typo so reversing the meaning of the post, off-topic for bringing ID into the discussion, or flamebait for the blasphemy of suggesting the existence of multiple creators.
People who have a voice in their parents basement are not nearly as scary as people having a voice in the street. Let them have their internet, makes it easier to document their deeds and to nap those few they rather not have heard (like those that would take up the rocks).
We can always hope that the broadcasters will kill this model, since it takes away their content presentation monopoly. How long until every TV show would be available as "seinfeld - original feed, 30 min" and as "Seinfeld - commercial free, 22 min".
Comcast is a major US cable TV and ISP company. (In)famous for breaking P2P protocols by inserting termination bits into the stream, and currently under investigation by the FCC (the US licensing body for broadcast technology)
Can you imagine the legal liability of running a hospital on FOSS software?
Trial lawyer: "the day my client's husband died, did you run your hospital computers on some free software you downloaded from the internet?"
Hospital administrator: "yes, but"
Trial lawyer: "thank you, that's all, no further questions"
A big selling point for commercial software is that you have someone else to blame when things go wrong. You claim "due diligence" in having selected the best money can buy (what might not have been the best you could have gotten for free, but juries are not filled with CS Ph.D.s).
where's the set of boot floppies with different emm.386 configurations to get all those early PC games going? I remember Ultima Underworld being my favorite game but also the one that taught me most about dos memory allocations.
Not to mention cutting notches in the C64 5.25" floppies to make them work dual sided (saved 50 cents a floppy).
And if you'd read the rest of the paper you'd find that he's got some decent arguments to back up his claims that even a working quantum computer is not the end of all, since it might run into limitations that might (or might not) be a true physical limit to computing. Or as they used to say, 42.
If he's really making a pressure vessel with substantial pressure resistance out of the soda bottle using carbon fiber - he's most likely cheating. Stretching a thin PET bottle is easily possible. Just "wrapping" it with carbon fiber doesn't do anything for your vessel, since the fibers would immediately go out of alignment and your thin inner shell blows. What he most likely is doing is forming a PET mandrel out of his cola bottle, then apply a carbon fiber - epoxy coat around it. Depending on his technique (use a nice filament winder if you got one) you can make the equivalent of a scuba tank easily using that approach.
The problem is, as mention in several other posts, that you can only stretch a pressure vessel that far without loosing a lot of stability, even if it's a well designed carbon fiber reinforced outer shell (you don't really want kevlar for this, kevlar is good for bullet proof wests that need to take impact, but not as good for pure tensile applications). So you balance extra drag from a fat vessel against extra propulsion medium. As for reaching space with a pure "stored physical energy" device, you'd need a long blow time in a rather cold environment, while at the same time your medium is cooling due to expansion/evaporation. Unless he's got his hand on a plutonium battery to keep the whole shebang warmed with reasonable weight penalty I don't think it will go very far in the best of cases. I can't wait for the/. headline about the nuclear powered pop rocket.
Converting electricity into hydrogen is a very efficient process, 80%+ theoretical, 50%+ practical. So if your solar cell works at 40%, you can generate hydrogen with 20% efficiency today. This does not take into account the energy used to make the solar cells, many solar cells have trouble breaking even on their lifetime energy balance. Making pure silicone wavers is a high temperature high energy process, irrelevant for computer chips with a cm^2 in area, but very important for solar cells made by the m^2. So a cell that can do 15% without the need of semiconductor technology would have a future under that aspect.
They solved the issue of privacy by declaring all domestic satellite images classified information. "In the interest of national security we can not disclose the methods of gathering the information, which incidentally means you cannot see the evidence against you since it would tell you how sensitive our systems are." That should take care of that civil liberty stuff too.
World annual oil consumption is something like 27 billion barrels. 1.8% of that is about 500,000,000 barrels, or 50,000,000 tons, or some 100 supertankers full. Seems rather impressive to me.
I remember having a card game of military aircraft in the mid 70's which had an Osprey prototype in it. The didn't actually field it until 30 years later. Without an actual military threat to force deployment, prime defense contractors take their time in development. That's where the money is, not in the (usually short) production run that follows.
So, let me get this straight, I remove the propellers that use energy and give the sub maneuverability and I use less energy? Brilliant concept, like a car that only uses a small battery to run the stereo but has no engine to waste gasoline. I just let the traffic push it along.
I think I take a solar powered version that charges during the day and dives at night.
Slashdot Mirror
The big advantage of a publicly funded TV program - the producers are less likely to cave in to advertiser's interests.
The IRS does not waterboard (yet)
The problem with mechanical impacting is that that's how you got the dust in the first place, meteorite impacts. If you impact hard enough to leave a decent size crater you generate enough dust to cover the surface up again. As for your portable anti tank weapon, that's based on a hollow charge, it's exactly the wrong type of explosive. You want something that sets free a large amount of gas to push the regolith out of the way, not something that's build to concentrate all its energy in a very fast chunk of liquefied copper that burns through steal but just gets absorbed in the dust. A sodium azide charge might do the trick (the stuff they use in car air bags), a nice bang that doesn't deposit a lot of energy in the material and makes more dust.
Not enough sugar in the coffee this morning? The issues of drilling on the moon are nothing you've ever seen on earth, and none are related to the lower gravity. A few facts (I know, you don't bother with them): Your surface temperature fluctuates from -220 C to + 110 C, with 150 C difference being a good guess for most locations. There are no lubricants that will work over that range, and none that work at -220 C. You have no atmosphere to cool your drill motor, or blow the highly abrasive regolith dust off your seals and bearings. You can't drill using the standard slurry approach to move your debris out of the hole. Your nearest spare parts are 300,000 miles away, and there's no one to loosen that lug nut. You have a very limited power supply from solar cells, and any dust you allow to get on the cells you will not be able to remove. For an easy challenge, try digging a hole in the middle of the Antarctic plateau, middle of winter, with a golf cart full of supplies, and a 5 kW generator for power. Remotely controlled.
Two problems, the regolith is about the the consistency of flour (somewhere in the 50 micron particle size). So you basically are trying to drill a hole in a flour silo, without being able to us the walls for support. It's also highly abrasive, and you're drilling dry, with the bits at rather low temperature (enhancing the brittleness of the drill bit).
And what your you using to blast with? I'm sorry, but your leaf blower doesn't work very efficiently at 10^-12 torr. You could use something similar to the ascend rockets they used on the lunar module (that set off the dust clouds that set of the "fake, fake" cries), but the regolith is several feet deep, so you need one hell of a blast there. You're actually better off to coat large areas with a very thin layer of binder, and keep the dust down that way.
will do, in the meantime, your homework assignment crater (krtr) 1. A bowl-shaped depression at the top of a volcano or at the mouth of a geyser. Volcanic craters can form because of magma explosions in which a large amount of lava is thrown out from a volcano, leaving a hole, or because the roof of rock over an underground magma pool collapses after the magma has flowed away. 2. A shallow, bowl-shaped depression in a surface, formed by an explosion or by the impact of a body, such as a meteorite. creator 1. Creator - terms referring to the Judeo-Christian God Almighty, Divine, God Almighty, Godhead, Lord, Maker, Jehovah Blessed Trinity, Holy Trinity, Sacred Trinity, Trinity - the union of the Father and Son and Holy Ghost in one Godhead hypostasis of Christ, hypostasis - any of the three persons of the Godhead constituting the Trinity especially the person of Christ in which divine and human natures are united
I don't know if to mod this funny for a typo so reversing the meaning of the post, off-topic for bringing ID into the discussion, or flamebait for the blasphemy of suggesting the existence of multiple creators.
People who have a voice in their parents basement are not nearly as scary as people having a voice in the street. Let them have their internet, makes it easier to document their deeds and to nap those few they rather not have heard (like those that would take up the rocks).
and if you'd used alt 148 for ö you'd won the price.
We can always hope that the broadcasters will kill this model, since it takes away their content presentation monopoly. How long until every TV show would be available as "seinfeld - original feed, 30 min" and as "Seinfeld - commercial free, 22 min".
Comcast is a major US cable TV and ISP company. (In)famous for breaking P2P protocols by inserting termination bits into the stream, and currently under investigation by the FCC (the US licensing body for broadcast technology)
Can you imagine the legal liability of running a hospital on FOSS software? Trial lawyer: "the day my client's husband died, did you run your hospital computers on some free software you downloaded from the internet?" Hospital administrator: "yes, but" Trial lawyer: "thank you, that's all, no further questions" A big selling point for commercial software is that you have someone else to blame when things go wrong. You claim "due diligence" in having selected the best money can buy (what might not have been the best you could have gotten for free, but juries are not filled with CS Ph.D.s).
I'm sure the same guys that gave the parent an insightful will mod you troll. But unfortunately you're also right.
Dos 6.22 was released 1994, while ultima underworld came out in 1992. Just in time to acquire another obsolete skill.
where's the set of boot floppies with different emm.386 configurations to get all those early PC games going? I remember Ultima Underworld being my favorite game but also the one that taught me most about dos memory allocations. Not to mention cutting notches in the C64 5.25" floppies to make them work dual sided (saved 50 cents a floppy).
And if you'd read the rest of the paper you'd find that he's got some decent arguments to back up his claims that even a working quantum computer is not the end of all, since it might run into limitations that might (or might not) be a true physical limit to computing. Or as they used to say, 42.
If he's really making a pressure vessel with substantial pressure resistance out of the soda bottle using carbon fiber - he's most likely cheating. Stretching a thin PET bottle is easily possible. Just "wrapping" it with carbon fiber doesn't do anything for your vessel, since the fibers would immediately go out of alignment and your thin inner shell blows. What he most likely is doing is forming a PET mandrel out of his cola bottle, then apply a carbon fiber - epoxy coat around it. Depending on his technique (use a nice filament winder if you got one) you can make the equivalent of a scuba tank easily using that approach. The problem is, as mention in several other posts, that you can only stretch a pressure vessel that far without loosing a lot of stability, even if it's a well designed carbon fiber reinforced outer shell (you don't really want kevlar for this, kevlar is good for bullet proof wests that need to take impact, but not as good for pure tensile applications). So you balance extra drag from a fat vessel against extra propulsion medium. As for reaching space with a pure "stored physical energy" device, you'd need a long blow time in a rather cold environment, while at the same time your medium is cooling due to expansion/evaporation. Unless he's got his hand on a plutonium battery to keep the whole shebang warmed with reasonable weight penalty I don't think it will go very far in the best of cases. I can't wait for the /. headline about the nuclear powered pop rocket.
Converting electricity into hydrogen is a very efficient process, 80%+ theoretical, 50%+ practical. So if your solar cell works at 40%, you can generate hydrogen with 20% efficiency today.
This does not take into account the energy used to make the solar cells, many solar cells have trouble breaking even on their lifetime energy balance. Making pure silicone wavers is a high temperature high energy process, irrelevant for computer chips with a cm^2 in area, but very important for solar cells made by the m^2.
So a cell that can do 15% without the need of semiconductor technology would have a future under that aspect.
They solved the issue of privacy by declaring all domestic satellite images classified information.
"In the interest of national security we can not disclose the methods of gathering the information, which incidentally means you cannot see the evidence against you since it would tell you how sensitive our systems are."
That should take care of that civil liberty stuff too.
I stand corrected. Please substitute an insignificant coal train 1,000,000 cars long instead.
World annual oil consumption is something like 27 billion barrels. 1.8% of that is about 500,000,000 barrels, or 50,000,000 tons, or some 100 supertankers full. Seems rather impressive to me.
I remember having a card game of military aircraft in the mid 70's which had an Osprey prototype in it. The didn't actually field it until 30 years later. Without an actual military threat to force deployment, prime defense contractors take their time in development. That's where the money is, not in the (usually short) production run that follows.
So, let me get this straight, I remove the propellers that use energy and give the sub maneuverability and I use less energy? Brilliant concept, like a car that only uses a small battery to run the stereo but has no engine to waste gasoline. I just let the traffic push it along. I think I take a solar powered version that charges during the day and dives at night.
This AI read Tom Clancy.