1. Lumping Africa and America together is ludicrously disingenuous. The socioeconomic problems driving the AIDS epidemic in Africa are completely different from those in North America. In developed countries, the MSM demographic is still by far the most at-risk group for HIV infection, and where most of the education effort to prevent the spread needs to be focused.
2. Reading comprehension?
CDC estimates MSM represent approximately 2% of the US population, but accounted for more than 50% of all new HIV infections annually from 2006 to 2009 –56% in 2006 (27,000), 58% in 2007 (32,300), 56% in 2008 (26,900) and 61% (29,300) in 2009.
Gay and bisexual men remain the population most heavily affected by HIV in the United States. CDC estimates MSM represent approximately 2% of the US population, but accounted for more than 50% of all new HIV infections annually from 2006 to 2009 –56% in 2006 (27,000), 58% in 2007 (32,300), 56% in 2008 (26,900) and 61% (29,300) in 2009.
It's a student competition. They exist to give students an opportunity to learn on "real" projects, not to create world changing technology. The only reason for biofuel at all is to create an extra challenge, and because "green" is popular.
There is a legal principle... I don't remember the latin, but a rough translation is 'the law is not stupid.' Legal decisions are made by judges, not bureaucrats or computers blindly following the rules. That's the essence of a common law system: the legal system is based on an understanding that reality is too complex to legislate completely, and judges have the authority to interpret how law is applied to reality as necessary. A literal interpretation is best if possible, but judges have leeway. Precedent then exists to ensure that the law, as actually applied, is consistent.
So, I suspect that if you try just sitting in the passenger seat and get into an accident, the judge will determine that: 1. You're still the operator. 2. You're an idiot.
And you'll probably get charged with dangerous driving too.
Unfortunately the hypothesis of the GP is based on displacement, and at the partial pressures you're working with it's going to be very sensitive to total pressure. Making that experiment work correctly would require very, very careful pressure control, and you'd probably have to replicate it a few dozen times to get data for various altitude levels. Otherwise it's a useless experiment.
So not something you can test 'without too much trouble,' if you want your result to have any actual meaning.
Unfortunately, those kinds of interior detail are chosen by the airline, not Boeing. Although I have to say, the bathrooms on the 777 are quite spacious, for an airplane.
It's very nice if you can run a company and just worry about your products, but unfortunately most senior management can't. The board and the shareholders hold them to stock price and quarterly earnings, and if they don't make the expectations they're likely to be replaced by the board.
Steve Jobs was a bit of an unusual case, because the man had a brand unlike almost any other corporate executive in the United States. Think about how he took most of Apple's engineering staff off of MacBook upgrades and OS X development to create the iPhone. It worked, and created Apple its most profitable product line ever. But what other person, at what other large company, has the political capital to sacrifice development of an existing profitable product line for an unknown?
That's why Apple was so successful under Jobs' tenure: he had the resources of a huge organization, but the political capital amongst employees, the board and the shareholders to make the kinds of decisions that usually only small companies (with small expectations) can manage. It takes technical talent to create great products, but it also takes a management that's willing to let the talent do that. It's unlikely that Apple will be able to continue in the same vein for long, now that Jobs is gone. His successors may be great, but they'll never be Jobs.
Light propagates at c in free space, but interference caused by interactions can make it appear to propagate slower. You should encounter this in any reasonable course on EM or optics. The idea that we've been measuring the speed of light wrong due to some hitherto unknown interaction isn't a completely ludicrous one, given how much less neutrinos like to interact.
The GP is almost certainly wrong, but not for the reasons you mention.
No, it just means there would be some hitherto unknown absorption and re-emission process. That induces phase shifts which creates an interference pattern which looks like the original bundle of photons travelling at a slower velocity.
The bigger issue is that the stress-energy tensor relates to the Ricci tensor by a term that includes c, and the Gravity Probe B experiment measured the Ricci tensor directly to an extremely high degree of accuracy. I'm sure there are other ways of measuring c, but that's the first that comes to mind. Had we got the speed of light wrong, it would have been found before now.
"Bathyscaphe" is just another word for a very deep sea submarine. Here is how DSV Alvin's ballast works:
The 4 sets of steel weights that are added to the submersible before each dive are known as "fixed buoyancy points." Once on the bottom, the pilot "drops" a predetermined amount of weight (1, 2, or 3 sets) in an attempt to achieve neutral buoyancy. Each of these weight sets provide a 208-lb. "step" in buoyancy.
This is where the variable ballast system comes into play. Unlike the main ballast, the tanks of the variable ballast system are independent of the outside pressure, which, at 2500m (8250ft) equals 3695psi (pounds per square inch) or 230 atmospheres (pressure at the surface is 14.7 psi or 1 atmosphere). The pilot can "fine-tune" the submersible to achieve and maintain neutral buoyancy during the dive by adjusting the amount of water in the variable ballast tanks. The amount of water in the variable ballast can be adjusted in 1-lb. increments to allow for buoyancy corrections between the 208-lb. "steps" of the steel weights. In particular, as the dive progresses, the submersible gets colder and "shrinks"; therefore, although it weighs the same, the "smaller" submersible displaces less water and becomes negatively buoyant. Removing water from the variable ballast tanks corrects this displacement and allows the submersible to remain neutral.
To leave the bottom at the end of the dive, the pilot releases the remaining sets of steel weights. This causes the submersible to become positively buoyant; it floats upward. As the submersible nears the surface, the pilot can "blow" air into the main ballast tanks to "add" buoyancy and aid in the ascent.
As a general rule ultra-deep sea submarines don't use the kind of air-vented ballast tanks you're thinking of because the pressure is too great at the bottom. You put an ordinary pressure cylinder on board and instead of air rushing out, the water will rush in when you open the valve on the bottom. You try to put enough pressure in the tank to overcome that and it'll explode on the surface. So you build the tank strong enough to resist the pressure and it's so massive that you have to quadruple the size of the submarine with fixed floatation just to overcome the weight of all that extra metal.
It just makes no sense to design a deep sea submarine that way, and there's no mention in any of the linked articles that this Chinese sub is designed to operate in that manner. It likely works just like Alvin and the Trieste.
Not in any practical sense. Weight is critically important in aviation, and kerosene has an order of magnitude higher specific energy than the best batteries.
The cynical answer is the company that makes the x-ray backscatter machines has friends in Washington.
The non-cynical answer is that having just a single supplier for a mandated piece of equipment is both risky and expensive. If the x-ray backscatter machine was banned, the millimeter wave machine's makers could charge whatever they liked.
The correct answer is probably somewhere in between.
Chain of custody. Evidence tampering isn't something that was suddenly invented after computers became popular, in case you never watched the OJ Simpson trial. Credibility of evidence is something trial lawyers know a lot about.
Pi is better for uber math nerds, physicists and EE geeks because there are lots of circumstances where you deal with the integer multiples of Pi, including odd multiples. The only people who like 'tau' are the math/science groupies online who worship, not practice, and think that Fermat's Last Theorem was an important problem.
Load on the grid shows up as mechanical resistance to the big spinning generators that control the frequency. If there is more load than generated supply, the generators slow and the frequency drops; more supply than load and the turbines spin the generators faster. Maintaining a balance of power is done by keeping the frequency at 60Hz.
That was easy enough when all power came from big generators, with predictable loads. But if you mandate photovoltaics and wind and other forms of power which vary in output, then things are a lot harder. The wind dies and a major wind farm drops a few hundred megawatts? The big generators can't respond quickly enough to keep frequency within its regulated range, so power companies have to install very expensive systems that can react faster.
Utilities are often legally mandated to buy power from renewable sources, but those renewable sources aren't held to any of the grid stability requirements. This ends up shifting an enormous burden of cost onto the utilities, who aren't happy with it. Loosening the grid frequency requirements is a way to make renewable but unreliable power less expensive.
You're telling me that an Internet denizen who's only been exposed to this idea for 5 minutes doesn't know more than the engineers who have been running the system for decades?
The US operates three separate power grids: the east interconnect, the west interconnect and ERCOT. They're only connected by DC links and are not phase locked.
Slashdot Mirror
1. Lumping Africa and America together is ludicrously disingenuous. The socioeconomic problems driving the AIDS epidemic in Africa are completely different from those in North America. In developed countries, the MSM demographic is still by far the most at-risk group for HIV infection, and where most of the education effort to prevent the spread needs to be focused.
2. Reading comprehension?
CDC estimates MSM represent approximately 2% of the US population, but accounted for more than 50% of all new HIV infections annually from 2006 to 2009 –56% in 2006 (27,000), 58% in 2007 (32,300), 56% in 2008 (26,900) and 61% (29,300) in 2009.
That is factually wrong.
Gay and bisexual men remain the population most heavily affected by HIV in the United States. CDC estimates MSM represent approximately 2% of the US population, but accounted for more than 50% of all new HIV infections annually from 2006 to 2009 –56% in 2006 (27,000), 58% in 2007 (32,300), 56% in 2008 (26,900) and 61% (29,300) in 2009.
Source
It's a student competition. They exist to give students an opportunity to learn on "real" projects, not to create world changing technology. The only reason for biofuel at all is to create an extra challenge, and because "green" is popular.
There is a legal principle... I don't remember the latin, but a rough translation is 'the law is not stupid.' Legal decisions are made by judges, not bureaucrats or computers blindly following the rules. That's the essence of a common law system: the legal system is based on an understanding that reality is too complex to legislate completely, and judges have the authority to interpret how law is applied to reality as necessary. A literal interpretation is best if possible, but judges have leeway. Precedent then exists to ensure that the law, as actually applied, is consistent.
So, I suspect that if you try just sitting in the passenger seat and get into an accident, the judge will determine that:
1. You're still the operator.
2. You're an idiot.
And you'll probably get charged with dangerous driving too.
Except, that's a pretty standard diagnostic test. Well, they use dobutamine instead of coke, but it has the same effect on your heart.
In all seriousness it has already been done. You can generate music based on a Thue-Morse sequence, which is repetition free: http://reglos.de/musinum/
Regardless, the GP was correct: water vapor is in fact a significant greenhouse gas.
Unfortunately the hypothesis of the GP is based on displacement, and at the partial pressures you're working with it's going to be very sensitive to total pressure. Making that experiment work correctly would require very, very careful pressure control, and you'd probably have to replicate it a few dozen times to get data for various altitude levels. Otherwise it's a useless experiment.
So not something you can test 'without too much trouble,' if you want your result to have any actual meaning.
Unfortunately, those kinds of interior detail are chosen by the airline, not Boeing. Although I have to say, the bathrooms on the 777 are quite spacious, for an airplane.
It's very nice if you can run a company and just worry about your products, but unfortunately most senior management can't. The board and the shareholders hold them to stock price and quarterly earnings, and if they don't make the expectations they're likely to be replaced by the board.
Steve Jobs was a bit of an unusual case, because the man had a brand unlike almost any other corporate executive in the United States. Think about how he took most of Apple's engineering staff off of MacBook upgrades and OS X development to create the iPhone. It worked, and created Apple its most profitable product line ever. But what other person, at what other large company, has the political capital to sacrifice development of an existing profitable product line for an unknown?
That's why Apple was so successful under Jobs' tenure: he had the resources of a huge organization, but the political capital amongst employees, the board and the shareholders to make the kinds of decisions that usually only small companies (with small expectations) can manage. It takes technical talent to create great products, but it also takes a management that's willing to let the talent do that. It's unlikely that Apple will be able to continue in the same vein for long, now that Jobs is gone. His successors may be great, but they'll never be Jobs.
I remember when Windows 2000 was released, everybody was harping on about its supposed "65,000 bugs."
Light propagates at c in free space, but interference caused by interactions can make it appear to propagate slower. You should encounter this in any reasonable course on EM or optics. The idea that we've been measuring the speed of light wrong due to some hitherto unknown interaction isn't a completely ludicrous one, given how much less neutrinos like to interact.
The GP is almost certainly wrong, but not for the reasons you mention.
No, it just means there would be some hitherto unknown absorption and re-emission process. That induces phase shifts which creates an interference pattern which looks like the original bundle of photons travelling at a slower velocity.
The bigger issue is that the stress-energy tensor relates to the Ricci tensor by a term that includes c, and the Gravity Probe B experiment measured the Ricci tensor directly to an extremely high degree of accuracy. I'm sure there are other ways of measuring c, but that's the first that comes to mind. Had we got the speed of light wrong, it would have been found before now.
You're trying to argue that gravity falls up. It's a nice attempt, but ultimately moot, because employee owned companies do exist.
http://en.wikipedia.org/wiki/List_of_employee-owned_companies
Perhaps you should consider that the challenges you mention are not insurmountable.
"Bathyscaphe" is just another word for a very deep sea submarine. Here is how DSV Alvin's ballast works:
The 4 sets of steel weights that are added to the submersible before each dive are known as "fixed buoyancy points." Once on the bottom, the pilot "drops" a predetermined amount of weight (1, 2, or 3 sets) in an attempt to achieve neutral buoyancy. Each of these weight sets provide a 208-lb. "step" in buoyancy.
This is where the variable ballast system comes into play. Unlike the main ballast, the tanks of the variable ballast system are independent of the outside pressure, which, at 2500m (8250ft) equals 3695psi (pounds per square inch) or 230 atmospheres (pressure at the surface is 14.7 psi or 1 atmosphere). The pilot can "fine-tune" the submersible to achieve and maintain neutral buoyancy during the dive by adjusting the amount of water in the variable ballast tanks. The amount of water in the variable ballast can be adjusted in 1-lb. increments to allow for buoyancy corrections between the 208-lb. "steps" of the steel weights. In particular, as the dive progresses, the submersible gets colder and "shrinks"; therefore, although it weighs the same, the "smaller" submersible displaces less water and becomes negatively buoyant. Removing water from the variable ballast tanks corrects this displacement and allows the submersible to remain neutral.
To leave the bottom at the end of the dive, the pilot releases the remaining sets of steel weights. This causes the submersible to become positively buoyant; it floats upward. As the submersible nears the surface, the pilot can "blow" air into the main ballast tanks to "add" buoyancy and aid in the ascent.
http://www.marinetech.org/nine_degrees/expedition.php?phase=log&date=942912000&base=expo942864462&picnum=0#ballast
As a general rule ultra-deep sea submarines don't use the kind of air-vented ballast tanks you're thinking of because the pressure is too great at the bottom. You put an ordinary pressure cylinder on board and instead of air rushing out, the water will rush in when you open the valve on the bottom. You try to put enough pressure in the tank to overcome that and it'll explode on the surface. So you build the tank strong enough to resist the pressure and it's so massive that you have to quadruple the size of the submarine with fixed floatation just to overcome the weight of all that extra metal.
It just makes no sense to design a deep sea submarine that way, and there's no mention in any of the linked articles that this Chinese sub is designed to operate in that manner. It likely works just like Alvin and the Trieste.
Except, the Trieste could. It wasn't fast: only 4hp with a maximum speed of 1 knot, but it still could.
Not in any practical sense. Weight is critically important in aviation, and kerosene has an order of magnitude higher specific energy than the best batteries.
http://en.wikipedia.org/wiki/Energy_density#Energy_densities_ignoring_external_components
The cynical answer is the company that makes the x-ray backscatter machines has friends in Washington.
The non-cynical answer is that having just a single supplier for a mandated piece of equipment is both risky and expensive. If the x-ray backscatter machine was banned, the millimeter wave machine's makers could charge whatever they liked.
The correct answer is probably somewhere in between.
Chain of custody. Evidence tampering isn't something that was suddenly invented after computers became popular, in case you never watched the OJ Simpson trial. Credibility of evidence is something trial lawyers know a lot about.
Don't be an idiot. If the TSA were having measurable successes like those, the leaders would be on TV regularly extolling their successes.
With political incentives like they are, absence of evidence is evidence of absence.
Pi is better for uber math nerds, physicists and EE geeks because there are lots of circumstances where you deal with the integer multiples of Pi, including odd multiples. The only people who like 'tau' are the math/science groupies online who worship, not practice, and think that Fermat's Last Theorem was an important problem.
No, a real geek would have done it from a TI-85.
Load on the grid shows up as mechanical resistance to the big spinning generators that control the frequency. If there is more load than generated supply, the generators slow and the frequency drops; more supply than load and the turbines spin the generators faster. Maintaining a balance of power is done by keeping the frequency at 60Hz.
That was easy enough when all power came from big generators, with predictable loads. But if you mandate photovoltaics and wind and other forms of power which vary in output, then things are a lot harder. The wind dies and a major wind farm drops a few hundred megawatts? The big generators can't respond quickly enough to keep frequency within its regulated range, so power companies have to install very expensive systems that can react faster.
Utilities are often legally mandated to buy power from renewable sources, but those renewable sources aren't held to any of the grid stability requirements. This ends up shifting an enormous burden of cost onto the utilities, who aren't happy with it. Loosening the grid frequency requirements is a way to make renewable but unreliable power less expensive.
You're telling me that an Internet denizen who's only been exposed to this idea for 5 minutes doesn't know more than the engineers who have been running the system for decades?
That goes against everything /. stands for!
The US operates three separate power grids: the east interconnect, the west interconnect and ERCOT. They're only connected by DC links and are not phase locked.