But I guess (can anyone confirm) that the strain on the skin is proportional to internal pressure minus external pressure
Yes, strain and load are proportional to the pressure (force = pressure * area). The difficulty comes in due to the area being proportional to the square of the radius. This is why tires can handle 35-65 psi and scuba tanks are able to hold 3000 psi while commercial aircraft can be damaged by the relatively small (~8-9psi) cabin pressures. Aloha Airlines Flight 243 is one example and there are several more here.
The loads the skin of these Bigelow Aerospace modules must carry are very large and it isn't a trivial engineering problem to make something that is strong enough to handle the pressure but light enough to launch into space.
Assuming 14psi, the axial pressure loads in the two larger BA modules are: BA330, 22ft diameter - 760,000 lbs BA2100, 41ft diameter - 2.7 million lbs
What you stated is generally true, but the 787 is somewhat of a special case. It uses a no-bleed APU system which replaces most of the traditionally bleed-driven systems (e.g. engine start, cabin air and wing anti-icing) with electrical equivalents and probably needs a larger set of batteries and higher current (and/or voltage) wiring.
The problem with this argument is that the same reasoning that defines software as mathematics also defines *all* patentable subject matter as mathematics.
I don't think this is true at all.
Suppose two inventors decide to solve the problem of lifting heavy objects. The first devises a system of a ramp and cart with wheels to roll the object up to the desired height. The second uses a set of pulleys to achieve the same goal. These two inventors wouldn't infringe on the others' patent even though they are mathematically identical concepts (i.e. applying mechanical advantage).
Based on the references, it's a 1/26316 chance per year of a damaging earthquake. Seems fairly safe to me, especially when you consider that there's virtually no risk from tornados, hurricanes, flooding or volcanos.
How about in the desert to the west of Phoenix, AZ? It's about as safe an area as I can think of from natural disasters and Palo Verde Nuclear Generating Station is located there.
The desert around Las Vegas would also be a good place geographically, but may not be cost competitive against Hoover Dam.
Every citizen has the right to vote, but it carries the responsibility of educating yourself on the candidates/propositions. Voting without knowing what you're voting for is foolish. At best it merely deflates the value of an informed voter (random selection) and at worst you can unwittingly sway an election against your interests (likely since many ballot propositions are deceivingly worded).
Recommending that others should vote, just to "exercise their right" isn't a noble cause and doesn't help produce a more representative government. Instead, get people to learn what's on the ballot and why they should vote, preferably with minimal personal bias.
Okay... maybe the resolution isn't completely substandard, but it is certainly below average and carries the highest price tag of any of the sanely priced wifi-only models (I have no idea what Toshiba was thinking trying to get $500 for the Excite 7.7).
As far as the need for cell service on a tablet, I can now see the value a bit more clearly from your post as well as others. It still seems like it would be more expensive, but I could see where the convenience may be worth it.
This may be a bit off topic, but I really don't understand why someone would want cell service on a tablet. How often do people use tablets when they have neither wifi access nor a phone they can tether to? It seems a very limited use case to justify the expense.
I must be missing something since they seem to be relatively popular.
Back on-topic
The biggest reason I think enthusiasm is limited on the iPad mini is the lack of a high resolution display. They needed to price it comparably to the other 7" range tablets with the screen they have now. Even Apple can't get away with charging a premium with a substandard display.
I wasn't trying to imply that it's an ideal situation, but it isn't impossible one either. AT&T will activate unlocked phones as far as I can tell, but they may require some convincing to unlock a device (even after the contract has expired). If you're looking for a more accommodating provider, T-Mobile has been relatively good about supporting unlocked phones. I know this firsthand since I switched to T-Mobile primarily because of the availability of lower priced plans without the subsidy.
That's really only true for the US CDMA carriers. They don't use SIM cards and getting them to activate a device they didn't sell is very difficult and would be unlikely to be fully functional anyway. The GSM carriers (mainly AT&T and T-Mobile) have very good compatibility with the exception of the 3G HSPA+ channels, but there are several pentaband 3G phones that fully support both networks.
Microsoft is hastening the heat death of the universe! Every time someone wastes energy, they're irrevocably releasing entropy into the universe which makes that much less energy available for us to continue to survive. Entropy is the ultimate pollutant! Sure it may only seem to make small reductions in temperature gradients, but the effects add up over time and will eventually lead Earth to be a uniformly cold lump of mass completely devoid of life!
Microsoft has polluted the world with huge amounts of entropy, purely for profit. This is unacceptable. The externalities of this type of greedy, reckless behavior should be accounted for. Something must be done!
To help curtail entropy pollution and extend the Earth's habitable lifetime, I propose we cap entropy production. Anyone exceeding more than a certain amount of entropy increase per year should be fined or we can sell some sort of entropy credit. Either way, the money should be used to research entropy reduction technologies.
Well, you could use chips which were manufactured long enough ago that all of the patents have expired (basically anything pre-1992 in the US). If you wait a few more months you could use a 66MHz Pentium!!
The argument given in the article is that if it appears to react as if it can feel and express emotion, abusing it would be morally wrong similar to how being cruel to an animal is wrong. Although, the applicability of the argument is going to be one of degrees. How aware of itself and its surroundings does something have to be before we start considering it legally equivalent to an animal, to a person?
Although, I don't really agree with the premise. I think we'll handle robots in basically the same way we've handled animals. Once robots reach some minimum level of perceived consciousness, it will be prescribed rights based on how much people empathize with it (e.g. cute, bunny shaped robots will be protected, but go ahead and smash away at insect-like ones).
Maybe the next generation will be able to combine the best of both. Ubuntu for Android looks promising as it would allow the use of full desktop type software. Of course it will be limited to the computing power available on the mobile device, but that is probably sufficient for many uses.
Based on my experience with the Gran Turismo driving simulator software, the computer controlled cars would strictly hold to the optimum racing line regardless of whether you're overtaking on the inside of a sharp corner or not. Of course, it won't matter since neither car will suffer any damage from the impact.
It is over 100 degrees for a significant amount of the year. If you go for a walk at night, it is still in the high 90s. Phoenix is the 6th largest city in the US, and is located in the middle of the desert. It has no semi-cool counter culture like nearby Tucson. It is just massive sprawl.
I won't deny that summers can get very hot during the afternoon and early evening, but even now I can go hiking in the mornings and be comfortable. At 6:00am it's been ~80F and moderately humid, but this is the worst time of the year due to the monsoon moisture. Any other time of year the humidity is very low making mid-90s temps perfectly fine weather for a walk.
There's also plenty of culture available, but it is usually found in smaller pockets scattered around the valley making it a bit more difficult to find than some other places.
Would you raise your children in a city where the only place you see grass is golf courses and cemeteries?
Where were you that didn't have any parks nearby? Even most of the suburban neighborhoods on the outskirts have nice parks with grass and sports facilities.
Would you jump to move to a city with no distinctive downtown, but rather 4 million people living in uncontrolled desert sprawl, completely devastated by the housing crash? And, yes, in Phoenix, it was a crash - houses thrown up with the cheapest materials and labor, doubling in price after only 5 years, only to be devastated by the realization that the owners paid for a tiny lot in a 4 million person desert sprawl, with the closest attraction being Las Vegas?
No distinctive downtown? The Phoenix area has several. Just off the top of my head, there's Downtown Phx, Old Town Scottsdale and the Mill ave area in Tempe. Each of which has a unique sub-culture, so there's something for everybody, and they're all within a 30 min drive of each other.
As for the housing "crash", that wasn't much worse than average in well established areas. The outlying areas (Buckeye, Apache Junction, Peoria, etc.) were hit hard for sure, but those were more recent developments that were being built out during the pre-05 boom and were out-building peak demand just as the crash was starting.
The closest attraction is Vegas? Now you're just trolling. You have to drive past the @#($*&(@ Grand Canyon to get there.
Yes, but I think almost everyone is. I don't think this was a product that google developed for a target market and isn't a big part of their overall hardware strategy. What I think it is, is a solution to arguments between googlers about which radio station gets played in the office. A couple of guys got fed up with the bickering and designed the Q. They're just selling them so that they can recoup the development costs and get a few more for themselves. Also, as an added benefit they were able to experiment with making hardware locally.
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But I guess (can anyone confirm) that the strain on the skin is proportional to internal pressure minus external pressure
Yes, strain and load are proportional to the pressure (force = pressure * area). The difficulty comes in due to the area being proportional to the square of the radius. This is why tires can handle 35-65 psi and scuba tanks are able to hold 3000 psi while commercial aircraft can be damaged by the relatively small (~8-9psi) cabin pressures. Aloha Airlines Flight 243 is one example and there are several more here.
The loads the skin of these Bigelow Aerospace modules must carry are very large and it isn't a trivial engineering problem to make something that is strong enough to handle the pressure but light enough to launch into space.
Assuming 14psi, the axial pressure loads in the two larger BA modules are:
BA330, 22ft diameter - 760,000 lbs
BA2100, 41ft diameter - 2.7 million lbs
What you stated is generally true, but the 787 is somewhat of a special case. It uses a no-bleed APU system which replaces most of the traditionally bleed-driven systems (e.g. engine start, cabin air and wing anti-icing) with electrical equivalents and probably needs a larger set of batteries and higher current (and/or voltage) wiring.
The problem with this argument is that the same reasoning that defines software as mathematics also defines *all* patentable subject matter as mathematics.
I don't think this is true at all.
Suppose two inventors decide to solve the problem of lifting heavy objects. The first devises a system of a ramp and cart with wheels to roll the object up to the desired height. The second uses a set of pulleys to achieve the same goal. These two inventors wouldn't infringe on the others' patent even though they are mathematically identical concepts (i.e. applying mechanical advantage).
I just decided to settle for the compressed version. Much smaller file size and I don't think it degraded the quality appreciably.
Based on the references, it's a 1/26316 chance per year of a damaging earthquake. Seems fairly safe to me, especially when you consider that there's virtually no risk from tornados, hurricanes, flooding or volcanos.
How about in the desert to the west of Phoenix, AZ? It's about as safe an area as I can think of from natural disasters and Palo Verde Nuclear Generating Station is located there.
The desert around Las Vegas would also be a good place geographically, but may not be cost competitive against Hoover Dam.
It is if your state requires proof of citizenship/residency to issue a license.
Every citizen has the right to vote, but it carries the responsibility of educating yourself on the candidates/propositions. Voting without knowing what you're voting for is foolish. At best it merely deflates the value of an informed voter (random selection) and at worst you can unwittingly sway an election against your interests (likely since many ballot propositions are deceivingly worded).
Recommending that others should vote, just to "exercise their right" isn't a noble cause and doesn't help produce a more representative government. Instead, get people to learn what's on the ballot and why they should vote, preferably with minimal personal bias.
Okay ... maybe the resolution isn't completely substandard, but it is certainly below average and carries the highest price tag of any of the sanely priced wifi-only models (I have no idea what Toshiba was thinking trying to get $500 for the Excite 7.7).
As far as the need for cell service on a tablet, I can now see the value a bit more clearly from your post as well as others. It still seems like it would be more expensive, but I could see where the convenience may be worth it.
This may be a bit off topic, but I really don't understand why someone would want cell service on a tablet. How often do people use tablets when they have neither wifi access nor a phone they can tether to? It seems a very limited use case to justify the expense.
I must be missing something since they seem to be relatively popular.
Back on-topic
The biggest reason I think enthusiasm is limited on the iPad mini is the lack of a high resolution display. They needed to price it comparably to the other 7" range tablets with the screen they have now. Even Apple can't get away with charging a premium with a substandard display.
I wasn't trying to imply that it's an ideal situation, but it isn't impossible one either. AT&T will activate unlocked phones as far as I can tell, but they may require some convincing to unlock a device (even after the contract has expired). If you're looking for a more accommodating provider, T-Mobile has been relatively good about supporting unlocked phones. I know this firsthand since I switched to T-Mobile primarily because of the availability of lower priced plans without the subsidy.
That's really only true for the US CDMA carriers. They don't use SIM cards and getting them to activate a device they didn't sell is very difficult and would be unlikely to be fully functional anyway. The GSM carriers (mainly AT&T and T-Mobile) have very good compatibility with the exception of the 3G HSPA+ channels, but there are several pentaband 3G phones that fully support both networks.
Where's the problem!?
Microsoft is hastening the heat death of the universe! Every time someone wastes energy, they're irrevocably releasing entropy into the universe which makes that much less energy available for us to continue to survive. Entropy is the ultimate pollutant! Sure it may only seem to make small reductions in temperature gradients, but the effects add up over time and will eventually lead Earth to be a uniformly cold lump of mass completely devoid of life!
Microsoft has polluted the world with huge amounts of entropy, purely for profit. This is unacceptable. The externalities of this type of greedy, reckless behavior should be accounted for. Something must be done!
To help curtail entropy pollution and extend the Earth's habitable lifetime, I propose we cap entropy production. Anyone exceeding more than a certain amount of entropy increase per year should be fined or we can sell some sort of entropy credit. Either way, the money should be used to research entropy reduction technologies.
Sincerely,
Al Gore
Well, you could use chips which were manufactured long enough ago that all of the patents have expired (basically anything pre-1992 in the US). If you wait a few more months you could use a 66MHz Pentium!!
The argument given in the article is that if it appears to react as if it can feel and express emotion, abusing it would be morally wrong similar to how being cruel to an animal is wrong. Although, the applicability of the argument is going to be one of degrees. How aware of itself and its surroundings does something have to be before we start considering it legally equivalent to an animal, to a person?
Although, I don't really agree with the premise. I think we'll handle robots in basically the same way we've handled animals. Once robots reach some minimum level of perceived consciousness, it will be prescribed rights based on how much people empathize with it (e.g. cute, bunny shaped robots will be protected, but go ahead and smash away at insect-like ones).
Please stop trying to bring rational thought into science journalism. If you succeed, I'll lose my main source of income.
Actually, Mr. Fusion doesn't get his doctorate until 2030. You may want to check the calibration on your flux capacitor.
In fact, we all should be able to make infrasounds. The difference is that the rest of us just call it breathing at a regular pace.
Seriously though, a sound that low would require moving a huge volume of air to create a pressure wave of any significance.
Maybe the next generation will be able to combine the best of both. Ubuntu for Android looks promising as it would allow the use of full desktop type software. Of course it will be limited to the computing power available on the mobile device, but that is probably sufficient for many uses.
It may look like we'll never get past Mars right now, but forever is a long time and Extrapolating can lead to faulty conclusions.
Easy, DMLS. It'd probably cost many times more than just buying a gun, but it would be able to print a finished steel barrel, rifling included.
Based on my experience with the Gran Turismo driving simulator software, the computer controlled cars would strictly hold to the optimum racing line regardless of whether you're overtaking on the inside of a sharp corner or not. Of course, it won't matter since neither car will suffer any damage from the impact.
It is over 100 degrees for a significant amount of the year. If you go for a walk at night, it is still in the high 90s. Phoenix is the 6th largest city in the US, and is located in the middle of the desert. It has no semi-cool counter culture like nearby Tucson. It is just massive sprawl.
I won't deny that summers can get very hot during the afternoon and early evening, but even now I can go hiking in the mornings and be comfortable. At 6:00am it's been ~80F and moderately humid, but this is the worst time of the year due to the monsoon moisture. Any other time of year the humidity is very low making mid-90s temps perfectly fine weather for a walk.
There's also plenty of culture available, but it is usually found in smaller pockets scattered around the valley making it a bit more difficult to find than some other places.
Would you raise your children in a city where the only place you see grass is golf courses and cemeteries?
Where were you that didn't have any parks nearby? Even most of the suburban neighborhoods on the outskirts have nice parks with grass and sports facilities.
Would you jump to move to a city with no distinctive downtown, but rather 4 million people living in uncontrolled desert sprawl, completely devastated by the housing crash? And, yes, in Phoenix, it was a crash - houses thrown up with the cheapest materials and labor, doubling in price after only 5 years, only to be devastated by the realization that the owners paid for a tiny lot in a 4 million person desert sprawl, with the closest attraction being Las Vegas?
No distinctive downtown? The Phoenix area has several. Just off the top of my head, there's Downtown Phx, Old Town Scottsdale and the Mill ave area in Tempe. Each of which has a unique sub-culture, so there's something for everybody, and they're all within a 30 min drive of each other.
As for the housing "crash", that wasn't much worse than average in well established areas. The outlying areas (Buckeye, Apache Junction, Peoria, etc.) were hit hard for sure, but those were more recent developments that were being built out during the pre-05 boom and were out-building peak demand just as the crash was starting.
The closest attraction is Vegas? Now you're just trolling. You have to drive past the @#($*&(@ Grand Canyon to get there.
Yes, but I think almost everyone is. I don't think this was a product that google developed for a target market and isn't a big part of their overall hardware strategy. What I think it is, is a solution to arguments between googlers about which radio station gets played in the office. A couple of guys got fed up with the bickering and designed the Q. They're just selling them so that they can recoup the development costs and get a few more for themselves. Also, as an added benefit they were able to experiment with making hardware locally.
Yes, but where in the world would they find such a company?
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