This issue won't even be properly tested until the first 5-segment Ares launches some time around 2013.
They have test-fired a five-segmenter horizontally already and there is a full 5-segment test, Ares 1-X, scheduled for 1st half of 2009. That will have a dummy second stage, but it is the full 5-segment rocket.
Ares V does use the Delta engines, same as Jupiter. RS-68's.
Difference is that Jupiter uses Space Shuttle Main Engines as the first stages. More expensive than the RS-68 once you run out of the current stock NASA has. Jupiter replaces the J2-X second stage engine with an RS-68. Which you could do on the Ares as well if they wanted to.
Consider recycling the Space Shuttle Main Engines (SSME) into the new launch vehicle.
Yes, they have a number available. Three per surviving bird plus say six spares. Nine if we're generous. That's 15 to 18 engines in total. Say we strap three to an Ares V class vehicle. That stage isn't designed to be recoverable, adds way too much weight and complexity to do so. So we get 5 to 6 launches out of the current stock of engines. Then what, we need brand-new engines.
The SSME is widely regarded as one of the most complex engines in existence. To build a new one is an expensive process compared to the simpler design of the RS-68 engine that is in the current design.
The RS-68 was designed to be disposable, cheaper and simpler and there is already a production line tooled up for the RS-68 for the Delta IV.
So medium-term, ten launches of the Ares V, clearly it is better to not recycle the engines.
We are recycling the SRB systems. New nozzles and slightly different taper to the fuel package, but same segments, seals and firing systems.
Avionics and so forth are fixed for the vehicle they were designed for, but I guess the designs and systems are being evolved for the new vehicles.
Launch pads, crawlers, service structures are all being reused, as is the entire mission control facility.
And if they don't nick the robot arms from the shuttles and stick them onto the new machines, they had better have new, more capable arms.
Fusion has this strange dichotomy in it, low start temperature = more pressure needed, high start temperature = less pressure. So they aim to kickstart a reaction from multi-million degree plasma because it doesn't require an entire sun worth of gravity-induced pressure to shove the atoms together. Only about a third of a sun, which might be obtainable with earth-sized tools.
Building a giant piston to take the heat of the plasma is beyond current materials science, so they use magnetic bottles and constrictors to compress and contain the reaction inside a torus.
The fusion explosion of a hydrogen bomb is triggered by the massive heat and pressure of a fission bomb going off first. But it ain't sustainable.
Yes. And? So grabbing a huge file off of the server next to me is more efficient than a VOIP call to Tokyo. I'm not seeing the problem yet.
The problem is subtle, and I've only seen it now that I read the TFA although I've experienced it with our internet connection at work.
The sliding window mechanism of sending packets before the ACK of the previous one until you get NACK and then back off has an unpleasant side-effect. An ACK train coming back over three hops from the local P2P clients or ISP-based servers moves faster than one heading across the world over 16 hops with higher ping times. Therefore the sliding window opens more and the traffic over the three hops can dominate the link.
Now add that problem with BitTorrent clients reported earlier that try for max bandwidth. That can force the window even wider.
And once the DSLAM/switch/aggregation port is saturated with traffic, it will delay or drop packets. If those are ACKs from the other side of the world, that window closes up more. There goes the time-sensitive nature of VOIP down the toilet.
On a shared-media network like cable, it doesn't even have to be you. If two people on the same cable are P2P transferring between each other, there goes the neighborhood. They dominate the line and the chap only using Skype down the road wonders why he isn't getting the performance he needs.
I'm opposed to price-oriented non-neutral networks, your ISP charging Google for your high speed access to them. But a non-neutral network that does proper QOS by throttling bandwidth-heavy protocols that don't behave themselves on the network is acceptable. As long as the QOS only moves the throttled protocols down when needed.
Moses, despite being born a member of a tribe that was enslaved, was a member of the Egyptian Royal household and had a cushy job until he decided to give it all up and free the slaves and run away. Never made it all the way to the promised land either.
Abraham was a high end sheik in the Tigris valley before he packed up his entire household and wandered off to a new spot in the middle of a desert area.
The only odd one out of the bunch you mentioned was Jesus and that was because he and the Father chose to place him in a low place. The Messiah was expected to be a king and leader, not a humble carpenter from a small village. It was needed to show the Jews their ideas were wrong.
Re:When birds go flying at the speed of sound...
on
Supersonic Skydiving
·
· Score: 1
He is possibly correct. At high altitude, the temperature drops and the speed of sound drops off. However at very high altitudes, there is an increase in atmospheric temperature that reverses the results from the formulae. At 25 miles the temperature can be up to 18 degrees Celsius that places sound speed at 336m/s. All depends how fast the drop-off is versus his speed/acceleration and atmospheric density.
The fastest I've seen a SATA-2 to SATA-2 copy, different channels, for 700MB was 87 seconds. 680MB in 24 seconds translates to 230Mbps which is faster than any consumer drive I've seen around.
And before someone 3.0Gbps's me, that's bus bandwidth, not drive. No drive can feed close to that.
IBM System x has some excellent AMD Opteron dual cores 1 and 2U machines, normally priced better than their Intel equivalents. We run most of our infrastructure on them.
x3455, x3655, x3755, BladeCenter LS21 and BladeCenter LS41
South Africa's current problem isn't an "Olduvai"-type crisis, if such a thing even existed in the first place. It was caused by a short-sighted government who refused to let the utility expand and maintain their generating capacity and infrastructure and now got caught with their pants down.
Duncan's theory doesn't take into account the possibility of high capacity alternatives such as orbital microwave, solar-thermal and even fusion if/when it comes around. Hell, given an accurate prediction of oil death, the USA might even go and haul a comet into orbit. Expensive and difficult, but cheaper than the cost of losing a society.
Slashdot Mirror
RHEL - 5.2 - caching-nameserver-9.3.4-6.P1.el5.i386.rpm
RHEL - 5.1 - caching-nameserver-9.3.3-10.el5.i386.rpm
RHEL - 4.6 - caching-nameserver-7.3-3.noarch.rpm
RHEL - 3.9 - caching-nameserver-7.3-3_EL3.noarch.rpm
This issue won't even be properly tested until the first 5-segment Ares launches some time around 2013.
They have test-fired a five-segmenter horizontally already and there is a full 5-segment test, Ares 1-X, scheduled for 1st half of 2009. That will have a dummy second stage, but it is the full 5-segment rocket.
Ares V does use the Delta engines, same as Jupiter. RS-68's.
Difference is that Jupiter uses Space Shuttle Main Engines as the first stages. More expensive than the RS-68 once you run out of the current stock NASA has. Jupiter replaces the J2-X second stage engine with an RS-68. Which you could do on the Ares as well if they wanted to.
Consider recycling the Space Shuttle Main Engines (SSME) into the new launch vehicle.
Yes, they have a number available. Three per surviving bird plus say six spares. Nine if we're generous. That's 15 to 18 engines in total. Say we strap three to an Ares V class vehicle. That stage isn't designed to be recoverable, adds way too much weight and complexity to do so. So we get 5 to 6 launches out of the current stock of engines. Then what, we need brand-new engines.
The SSME is widely regarded as one of the most complex engines in existence. To build a new one is an expensive process compared to the simpler design of the RS-68 engine that is in the current design.
The RS-68 was designed to be disposable, cheaper and simpler and there is already a production line tooled up for the RS-68 for the Delta IV.
So medium-term, ten launches of the Ares V, clearly it is better to not recycle the engines.
We are recycling the SRB systems. New nozzles and slightly different taper to the fuel package, but same segments, seals and firing systems.
Avionics and so forth are fixed for the vehicle they were designed for, but I guess the designs and systems are being evolved for the new vehicles.
Launch pads, crawlers, service structures are all being reused, as is the entire mission control facility.
And if they don't nick the robot arms from the shuttles and stick them onto the new machines, they had better have new, more capable arms.
No steps forward and two steps back.
I suspect the paragraph about not being religious at all in the law will prove its downfall at SCOTUS.
Chew, chew, chew, chew, chew, chew, chew, spit, spit.
Fusion has this strange dichotomy in it, low start temperature = more pressure needed, high start temperature = less pressure. So they aim to kickstart a reaction from multi-million degree plasma because it doesn't require an entire sun worth of gravity-induced pressure to shove the atoms together. Only about a third of a sun, which might be obtainable with earth-sized tools.
Building a giant piston to take the heat of the plasma is beyond current materials science, so they use magnetic bottles and constrictors to compress and contain the reaction inside a torus.
The fusion explosion of a hydrogen bomb is triggered by the massive heat and pressure of a fission bomb going off first. But it ain't sustainable.
The problem is subtle, and I've only seen it now that I read the TFA although I've experienced it with our internet connection at work.
The sliding window mechanism of sending packets before the ACK of the previous one until you get NACK and then back off has an unpleasant side-effect. An ACK train coming back over three hops from the local P2P clients or ISP-based servers moves faster than one heading across the world over 16 hops with higher ping times. Therefore the sliding window opens more and the traffic over the three hops can dominate the link.
Now add that problem with BitTorrent clients reported earlier that try for max bandwidth. That can force the window even wider.
And once the DSLAM/switch/aggregation port is saturated with traffic, it will delay or drop packets. If those are ACKs from the other side of the world, that window closes up more. There goes the time-sensitive nature of VOIP down the toilet.
On a shared-media network like cable, it doesn't even have to be you. If two people on the same cable are P2P transferring between each other, there goes the neighborhood. They dominate the line and the chap only using Skype down the road wonders why he isn't getting the performance he needs.
I'm opposed to price-oriented non-neutral networks, your ISP charging Google for your high speed access to them. But a non-neutral network that does proper QOS by throttling bandwidth-heavy protocols that don't behave themselves on the network is acceptable. As long as the QOS only moves the throttled protocols down when needed.
14 day shuttle flight. Four of those weekend days. That 72 hours at double rate. 144 hours.
10 days left, 8 hours at normal rate, 16 at double rate. 320 + 80 + 144 = 544 hours.
Normal hourly rate say $50 an hour. Double that for an emergency call. $100.
$54400 or so for the work.
Then he doesn't have the right part with him, so double the cost for the next shuttle flight.
$108800. For a broken loo.
Maybe there's hope for us mutants then.
X
Moses, despite being born a member of a tribe that was enslaved, was a member of the Egyptian Royal household and had a cushy job until he decided to give it all up and free the slaves and run away. Never made it all the way to the promised land either.
Abraham was a high end sheik in the Tigris valley before he packed up his entire household and wandered off to a new spot in the middle of a desert area.
The only odd one out of the bunch you mentioned was Jesus and that was because he and the Father chose to place him in a low place. The Messiah was expected to be a king and leader, not a humble carpenter from a small village. It was needed to show the Jews their ideas were wrong.
He is possibly correct. At high altitude, the temperature drops and the speed of sound drops off. However at very high altitudes, there is an increase in atmospheric temperature that reverses the results from the formulae. At 25 miles the temperature can be up to 18 degrees Celsius that places sound speed at 336m/s. All depends how fast the drop-off is versus his speed/acceleration and atmospheric density.
Mach Calculations. Temperature v Altitude.
Easy. One/two/foor gig card. Most cameras don't care what else is on the card if it can see the pictures folder.
Brilliant.
And what's the inability to open two files, in different directories, with the same name?
Still. Now. After all these years. How is that a feature? And how difficult is it to fix?
Faulty screws = faulty propeller blades, not fasteners.
Ye olde English term.
Now I'm getting a table crashed error
This chap is not on the LHC team, or related to CERN in any way. He lives in Hawaii and runs/ran a botanical garden.
Negative credibility compared to the real safety experts at CERN that are saying he is wrong.
Now, how do you explain that you've just had radiation treatment to the mindless TSA buffoon who's found you're radioactive?
It's O'Niell, with two l's. There's another Col O'Niel with one l and he has no sense of humor.
My cursed great-great-great-great grandfather still swears at garlic and a crucifix, you insensitive clod!
And at the sun.
Mullet?
Sorry, just too tempting by half.
The fastest I've seen a SATA-2 to SATA-2 copy, different channels, for 700MB was 87 seconds. 680MB in 24 seconds translates to 230Mbps which is faster than any consumer drive I've seen around.
And before someone 3.0Gbps's me, that's bus bandwidth, not drive. No drive can feed close to that.
Trust me, trust me not, trust me, trust me not.
Oh damn, there goes my password.
Do you believe the developer? What debug code needs to send an email containing user account information?
Total power loss on the UK grid in 2005 was 1423 MW out of 63 total demand.
Hardly most of the power lost in transmission.
Sources - http://www.nationalgrid.com/uk/library/documents/sys05/default.asp?sNode=SYS&action=&Exp=Y
IBM System x has some excellent AMD Opteron dual cores 1 and 2U machines, normally priced better than their Intel equivalents. We run most of our infrastructure on them.
x3455, x3655, x3755, BladeCenter LS21 and BladeCenter LS41
South Africa's current problem isn't an "Olduvai"-type crisis, if such a thing even existed in the first place. It was caused by a short-sighted government who refused to let the utility expand and maintain their generating capacity and infrastructure and now got caught with their pants down.
Duncan's theory doesn't take into account the possibility of high capacity alternatives such as orbital microwave, solar-thermal and even fusion if/when it comes around. Hell, given an accurate prediction of oil death, the USA might even go and haul a comet into orbit. Expensive and difficult, but cheaper than the cost of losing a society.