Then I'd [say] someone isn't doing everything they could be doing. You shouldn't need all things manually controlled. They should be spending just as much time on ECUs and such as they do on everything else.
Formula 1 used to allow automated launch control, traction control, etc. The FIA (the ruling body) outlawed all that and returned control to the drivers. The new KERS system and DRS system are manually controlled, as is the brake bias (front to back only), fuel mapping, etc. The driver is still changing the gears in theory, although the super-fast seamless shift trannies are doing all the work. The FIA has decided that allowing too much automation takes away from the sport and is too costly (they've instituted some cost-cutting measures, some of which have backfired).
Imperial units do not use a fixed base.... inches are measured in base 12, nails are measured in base 16, hands are measured in base 4, palms are measured in base 3, feet are measured in base 3, yards are measured in base 22, chains are measured in base 10, furlongs are measured in base 8, miles are measured in base 3.
You keep using that word. I do not think it means what you think it means. The base of a counting system represents the number of symbols used in each digit place, not the grouping of units. A foot is indeed 12 inches, but that doesn't mean you count from 0 to B inches, which is what base 12 would imply.
"From 1986-1994, the base currency unit was shifted three times to adjust for inflation in the final years of the Brazilian military dictatorship era. A 1967 cruzeiro was, in 1994, worth less than one trillionth of a US cent, after adjusting for multiple devaluations and note changes. In that same year, inflation reached a record 2075.8%. A new currency called real was adopted in 1994, and hyperinflation was eventually brought under control. The real was also the currency in use until 1942; 1 (current) real is the equivalent of 2,750,000,000,000,000,000 of Brazil's first currency (called réis in Portuguese)."
You can get awfully ill if your or someone else's gut flora makes it into your stomach (or eye,...). Just because astronauts seem sterile on the outside after a few weeks it doesn't mean they're sterile inside. Add microgravity to that, and the odds of ingesting feces go way up.
Constant-speed props work very well on aircraft that have engines with narrow power/efficiency bands. Constant speed props are verboten on Light Sport Aircraft, so they're limited to 'real' light aircraft.
That is not necessarily true, and has not been scientifically proven. There is some evidence of a radiation-induced hormesis effect, particularly in very high background radiation areas - see this paragraph for an example of this paradox in action in Iran. Most countries follow the Linear, No Threshold and ALARP/ALARA principles, but there is no proof that LNT appropriate. It's nearly impossible to prove that such low levels of exposure are correlated to detrimental effects. LNT are the law of the land by decree (based on taking the most conservative route), not by science.
You are correct that the 4 hour charge time requires the high power wall connector. It seems that the charge rate can be set, since "Breaker rating will determine charge time. The Roadster can draw 80% of the Breaker Amperage." 80% of breaker rating is the law in the US for continuous draw, so it seems that the unit can be set to draw current based on the breaker upstream of it. From the Tesla site (same page you quoted):
So if your whole house feed is 100A, install a 50A breaker and expect a 6 hour full charge. Overnight that shouldn't be a big issue, right?
Interestingly, the amount of charge delivered varies with charge speed (efficiency and all that) - at 70A 280 Ah is delivered, at 64A=268.8 Ah, 56A=263.2Ah, 48A=240Ah, and 40A=240Ah. The 4 hour charge 'burns' 16.6% more power than the slower 5 or 6 hour charge. For every 6 fast 4 hour charges, you could have 7 5 or 6 hour ones for the same $$$.
The safest and most effective way to deal with nuclear waste in storage pools is to not have huge quantities of it to begin with - burnit! if it's so hot that it has to be cooled, it's hot enough to use as fuel. IFRs and other 'burner' technologies can reduce the waste's quantity by a factor of 100 and storage requirements by thousands of years.
Wild turkey can and do fly. They can't land worth a darn, though. I was turkey hunting once when one came in for a landing nearby - it was as if God had let slip a feathered bowling ball into the woods. That bird must've crashed through 50 feet of small trees and underbrush before rolling to a stop.
Thanks for the reply. The stations I mentioned are not trans-oceanic - they go from the Washington/Oregon border to southern California, a distance of 1,362-kilometers or 846 miles over dry land. There seem to be lots of DC interties in the works around the world, including those that are strung on poles. Have a look at the last entries in this table - there seem to be an awful lot of them under construction. These enormous installations fall into your "...really big, obscene cases where DC really starts to pull ahead."
I agree wrt the safety aspects of AC vs DC and that under the desk isn't a good place for HVDC. In an enclosed rack, however...?
I agree that the OP was talking about wiring in the lab and I pulled in transmission. His assertion that "Direct current requires larger gauge wiring than AC power, which increases material costs considerably. In general, DC power is economical only if the wiring between the computers and the DC source is less than 35 feet in length. More than that, AC power becomes more economical" is not true for distances over 35 feet (assuming the same voltage) - that was the case I was addressing. Transmission distances are waaaay over 35 feet, and DC wins. The insulation I spoke of wasn't on the conductor, rather on each and every transmission tower. Also, it seems that he assumes that (as you said) the DC voltages would be lower than the mains. I don't see why that must or should be the case, since as you pointed out current (and therefore wire size) must increase if you decrease the voltage for a given power level.
Thank you for your reply. I wasn't talking about house wiring, rather AC transmission vs DC transmission. The cost of insulators on every support point that must withstand 1.4x the RMS voltage are going to be larger, heavier, and more costly. The skin effect is alive and well at 60 Hz, and for large conductors and large distances can be non-negligible. For very long distances or for routes that span grids, the phase of the two systems at either end can be difficult to manage for AC.
I understand Joule heating of conductors, and I understand the historical bonuses of AC. Note that I compared apples to apples - DC V = AC Vrms, DC I = AC Irms. For a given power level, DC is the better choice. I've also had the privilege of touring the massive DC conversion/transmission station at Celilo which pushes 3,100 Amperes at +/-500 kV to SoCal, part of the Pacific Intertie.
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Then I'd [say] someone isn't doing everything they could be doing. You shouldn't need all things manually controlled. They should be spending just as much time on ECUs and such as they do on everything else.
Formula 1 used to allow automated launch control, traction control, etc. The FIA (the ruling body) outlawed all that and returned control to the drivers. The new KERS system and DRS system are manually controlled, as is the brake bias (front to back only), fuel mapping, etc. The driver is still changing the gears in theory, although the super-fast seamless shift trannies are doing all the work. The FIA has decided that allowing too much automation takes away from the sport and is too costly (they've instituted some cost-cutting measures, some of which have backfired).
I've started seeing 500ml bottles of soft drinks appearing on local shelves. That's 16.9 fl oz to us 'mericans.
Imperial units do not use a fixed base. ... inches are measured in base 12, nails are measured in base 16, hands are measured in base 4, palms are measured in base 3, feet are measured in base 3, yards are measured in base 22, chains are measured in base 10, furlongs are measured in base 8, miles are measured in base 3.
You keep using that word. I do not think it means what you think it means. The base of a counting system represents the number of symbols used in each digit place, not the grouping of units. A foot is indeed 12 inches, but that doesn't mean you count from 0 to B inches, which is what base 12 would imply.
Neutron != neutrino.
Uh, you didn't count all the revaluations and hyperinflation around 1994. From the article:
"From 1986-1994, the base currency unit was shifted three times to adjust for inflation in the final years of the Brazilian military dictatorship era. A 1967 cruzeiro was, in 1994, worth less than one trillionth of a US cent, after adjusting for multiple devaluations and note changes. In that same year, inflation reached a record 2075.8%. A new currency called real was adopted in 1994, and hyperinflation was eventually brought under control. The real was also the currency in use until 1942; 1 (current) real is the equivalent of 2,750,000,000,000,000,000 of Brazil's first currency (called réis in Portuguese)."
You can get awfully ill if your or someone else's gut flora makes it into your stomach (or eye, ...). Just because astronauts seem sterile on the outside after a few weeks it doesn't mean they're sterile inside. Add microgravity to that, and the odds of ingesting feces go way up.
You are horribly naive if you think that's all there is to it. Zip code is _not_ sufficient to determine one's tax jurisdiction(s), and you must take into account the many classification(s) of the item (likely by barcode) to determine the correct tax rate. In Virginia, for example, there are different rates for eligible food items, medicine, and extra fees for prepaid wireless services. There are also tax holidays that forego sales tax on certain items at certain times (school supplies in August, Hurricane preparedness items in May, etc).
Determining the _correct_ tax rate is extremely convoluted, rules-based, and dynamic. That's what there are companies that do it.
Don't forget that Picard and Anij had a slow-motion fling in ST:Insurrection.
Constant-speed props work very well on aircraft that have engines with narrow power/efficiency bands. Constant speed props are verboten on Light Sport Aircraft, so they're limited to 'real' light aircraft.
What's funny is that I've seen food-grade paper printed with faux news stories so that it resembles newsprint!
There's a third set of pics, one of which shows boxes of batteries in the control room.
Well, pretty much any radioactivity is harmful.
That is not necessarily true, and has not been scientifically proven. There is some evidence of a radiation-induced hormesis effect, particularly in very high background radiation areas - see this paragraph for an example of this paradox in action in Iran. Most countries follow the Linear, No Threshold and ALARP/ALARA principles, but there is no proof that LNT appropriate. It's nearly impossible to prove that such low levels of exposure are correlated to detrimental effects. LNT are the law of the land by decree (based on taking the most conservative route), not by science.
Hey, didn't you know, you can get high from smoking banana peals
I've never known a banana to ring out with a mellifluous tone, and even if one did I doubt it would get me high.
You are correct that the 4 hour charge time requires the high power wall connector. It seems that the charge rate can be set, since "Breaker rating will determine charge time. The Roadster can draw 80% of the Breaker Amperage." 80% of breaker rating is the law in the US for continuous draw, so it seems that the unit can be set to draw current based on the breaker upstream of it. From the Tesla site (same page you quoted):
Breaker Rating (Amps) Draw (Amps) Approximate Charge Time (hours)
90 70 4
80 64 4.2
70 56 4.7
60 48 5
50 40 6
So if your whole house feed is 100A, install a 50A breaker and expect a 6 hour full charge. Overnight that shouldn't be a big issue, right?
Interestingly, the amount of charge delivered varies with charge speed (efficiency and all that) - at 70A 280 Ah is delivered, at 64A=268.8 Ah, 56A=263.2Ah, 48A=240Ah, and 40A=240Ah. The 4 hour charge 'burns' 16.6% more power than the slower 5 or 6 hour charge. For every 6 fast 4 hour charges, you could have 7 5 or 6 hour ones for the same $$$.
Hydrogen does not burn blue, it can not make any light whatsoever.
"Can not" is a strong statement to make in science. There are 4 lines in the Balmer Series in the visible part of the EM spectrum for hydrogen.
From wikipedia: Flammability limits: between 4.0%v/v and 75.0%v/v H2 in air @ STP, explosive limits: 18.3 %v/v to 59 %v/v H2 in air at STP.
The safest and most effective way to deal with nuclear waste in storage pools is to not have huge quantities of it to begin with - burn it! if it's so hot that it has to be cooled, it's hot enough to use as fuel. IFRs and other 'burner' technologies can reduce the waste's quantity by a factor of 100 and storage requirements by thousands of years.
Hold you shovel there, HotTuna. I'm not a Mac fanboy, I'm a smart wife fanboy.
Oh, turkeys can't fly either...
Wild turkey can and do fly. They can't land worth a darn, though. I was turkey hunting once when one came in for a landing nearby - it was as if God had let slip a feathered bowling ball into the woods. That bird must've crashed through 50 feet of small trees and underbrush before rolling to a stop.
If your wife can't get used to a Mac in 6 months, I'd replace the wife.
Thanks for the reply. The stations I mentioned are not trans-oceanic - they go from the Washington/Oregon border to southern California, a distance of 1,362-kilometers or 846 miles over dry land. There seem to be lots of DC interties in the works around the world, including those that are strung on poles. Have a look at the last entries in this table - there seem to be an awful lot of them under construction. These enormous installations fall into your "...really big, obscene cases where DC really starts to pull ahead."
I agree wrt the safety aspects of AC vs DC and that under the desk isn't a good place for HVDC. In an enclosed rack, however...?
Anorexic or perhaps alliterative, but not dyslexic.
I agree that the OP was talking about wiring in the lab and I pulled in transmission. His assertion that "Direct current requires larger gauge wiring than AC power, which increases material costs considerably. In general, DC power is economical only if the wiring between the computers and the DC source is less than 35 feet in length. More than that, AC power becomes more economical" is not true for distances over 35 feet (assuming the same voltage) - that was the case I was addressing. Transmission distances are waaaay over 35 feet, and DC wins. The insulation I spoke of wasn't on the conductor, rather on each and every transmission tower. Also, it seems that he assumes that (as you said) the DC voltages would be lower than the mains. I don't see why that must or should be the case, since as you pointed out current (and therefore wire size) must increase if you decrease the voltage for a given power level.
For a massive scale HVDC installation, see http://en.wikipedia.org/wiki/Pacific_DC_Intertie and http://en.wikipedia.org/wiki/Celilo_Converter_Station . 3,100 Megawatts (3,100 Amperes at +/-500 kV). Impressive!
Thank you for your reply. I wasn't talking about house wiring, rather AC transmission vs DC transmission. The cost of insulators on every support point that must withstand 1.4x the RMS voltage are going to be larger, heavier, and more costly. The skin effect is alive and well at 60 Hz, and for large conductors and large distances can be non-negligible. For very long distances or for routes that span grids, the phase of the two systems at either end can be difficult to manage for AC.
I understand Joule heating of conductors, and I understand the historical bonuses of AC. Note that I compared apples to apples - DC V = AC Vrms, DC I = AC Irms. For a given power level, DC is the better choice. I've also had the privilege of touring the massive DC conversion/transmission station at Celilo which pushes 3,100 Amperes at +/-500 kV to SoCal, part of the Pacific Intertie.