It is my understanding that our DNA has repair mechanisms that will fix some of these radiation-induced errors, but that these repair mechanisms are quite slow, so total dose is not as important as how quickly it is received.
The parent here is correct, except that density over time is also important. I suggest brushing up on radiation safety before you work with any more of that ionizing radiation;)
Except the shock cone of say, an SR-71 Blackbird, originate at the nose and inlet cones of the aircraft, and these are specifically designed to keep the shockwaves ahead of the engines, and thus keep the airflow in the engines subsonic.
What you are saying is mostly correct, except that this wall of sound is what happens when "sound" starts to behave non-linearly. When you try to push air faster than a certain speed, molecules begin to pile up, density increases, heat increases, and it stops behaving like air in the way we are used to. You don't need a sound source for this. The energy you are pumping into that shockwave will be plenty loud.
I think some artillery create shock waves that can be felt before the cannon can be heard.
Well, it does, actually. If you intercept a signal, you absorb part of it, so you are changing the electromagnetic field. If you are changing the electromagnetic field, you can be tracked (in principle). Of course you're not going to track a portable radio for reasons of practicality, but that's an issue of scale, and not something fundamentally inherent to the theory.
In some circles it goes by the name of radar:)
Actually, "out of Earth's gravity well" would truly be the "edge of space", i.e., infinitely far away. As I understand, the biggest problem in getting to space is to spend as little time as possible in the deepest part of the well, because, going straight up, maintaining that altitude costs a lot of power. But if the structure is self-supporting, then you can hoist up your fuel and payload using more efficient means, since you don't have to actively maintain your altitude. It's called "gravity drag". I'm not really up on the numbers, but the first 10% costs you a helluva lot more fuel than the "last" 10%, for most values of $destination.
Well this is closer to "universality", which is a concept in field theory and condensed matter physics, in which the "atomic" characteristics of a system are largely irrelevant to its macroscopic properties, save for specifying a few parameters like viscosity or resistivity. Unlike your differential equation example, the equations for both are very different and non-trivial. When you start enumerating differential equations starting from the simplest you can write down, the harmonic oscillator, heat equation, diffusion equation and so forth pop out right away. You'll be writing for a long time before 11D supergravity equations of motion pop out.
Many women are interested in using technology, they just don't want to dive in to quite the same depth. Or they may not be interested in the way most men approach it.
Or... and I'm going out on a limb here... many women don't want men telling them what they want. "Just don't want to dive into quite the same depth"? Dear lord.
AFAIK, this is essentially the script paradigm of AI, which is fine to augment intelligence (we do it all the time), but without learning, it is quite expensive, and susceptible to the Chinese Room argument.
It's all about cross section, which roughly depends on the incoming particle's energy being close to the energy of a bound state in the atoms of the material that is to absorb the radiation. The density contributes an overall factor to the calculation.
Also, led is nasty when charged particles are involved (electrons, probably protons), because they will rapidly decelerate and create brehmstrahlung, so you've traded a charged particle which is easy to deflect with an X ray, which is not easy to reflect. My wife uses plexiglass shields in her lab for this reason, because it gracefully absorbs beta radiation.
Fortunately not everyone shares your view. The world we live in is the way it is (for better or for worse) because it has historical context. We don't live from one moment to the next wondering where our next meal is going to come from. We plan, we dream, we reflect.
How? As soon as Apple releases a EU version with replaceable batteries, your point will become moot. They did the same thing with Windows XP, and it's not like Microsoft has any competition that needs protection.
Heh... I knew who Roger Penrose was long before I heard of Richard Dawkins, and I suspect that I'll forget who Richard Dawkins soon enough. But I'm biased for being a physicist.
Slashdot Mirror
It is my understanding that our DNA has repair mechanisms that will fix some of these radiation-induced errors, but that these repair mechanisms are quite slow, so total dose is not as important as how quickly it is received. The parent here is correct, except that density over time is also important. I suggest brushing up on radiation safety before you work with any more of that ionizing radiation ;)
Except the shock cone of say, an SR-71 Blackbird, originate at the nose and inlet cones of the aircraft, and these are specifically designed to keep the shockwaves ahead of the engines, and thus keep the airflow in the engines subsonic. What you are saying is mostly correct, except that this wall of sound is what happens when "sound" starts to behave non-linearly. When you try to push air faster than a certain speed, molecules begin to pile up, density increases, heat increases, and it stops behaving like air in the way we are used to. You don't need a sound source for this. The energy you are pumping into that shockwave will be plenty loud. I think some artillery create shock waves that can be felt before the cannon can be heard.
Aeroloft is apparently quite widely used and is derived from aerogel.
Well, it does, actually. If you intercept a signal, you absorb part of it, so you are changing the electromagnetic field. If you are changing the electromagnetic field, you can be tracked (in principle). Of course you're not going to track a portable radio for reasons of practicality, but that's an issue of scale, and not something fundamentally inherent to the theory. In some circles it goes by the name of radar :)
Maxwell's demon anyone?
Plus it makes red wine taste great!
Actually, "out of Earth's gravity well" would truly be the "edge of space", i.e., infinitely far away. As I understand, the biggest problem in getting to space is to spend as little time as possible in the deepest part of the well, because, going straight up, maintaining that altitude costs a lot of power. But if the structure is self-supporting, then you can hoist up your fuel and payload using more efficient means, since you don't have to actively maintain your altitude. It's called "gravity drag". I'm not really up on the numbers, but the first 10% costs you a helluva lot more fuel than the "last" 10%, for most values of $destination.
Well this is closer to "universality", which is a concept in field theory and condensed matter physics, in which the "atomic" characteristics of a system are largely irrelevant to its macroscopic properties, save for specifying a few parameters like viscosity or resistivity. Unlike your differential equation example, the equations for both are very different and non-trivial. When you start enumerating differential equations starting from the simplest you can write down, the harmonic oscillator, heat equation, diffusion equation and so forth pop out right away. You'll be writing for a long time before 11D supergravity equations of motion pop out.
From context I gather that the author of the book *review* is a man.
Or... and I'm going out on a limb here... many women don't want men telling them what they want. "Just don't want to dive into quite the same depth"? Dear lord.
Weird. I plugged my KRZR into my monitor and it charged just fine. Only later did I install drivers to get mass storage to work.
You'd have to watch for atomic scale foxes, which will tunnel right through to your chickens.
AFAIK, this is essentially the script paradigm of AI, which is fine to augment intelligence (we do it all the time), but without learning, it is quite expensive, and susceptible to the Chinese Room argument.
Or libel.
It's all about cross section, which roughly depends on the incoming particle's energy being close to the energy of a bound state in the atoms of the material that is to absorb the radiation. The density contributes an overall factor to the calculation. Also, led is nasty when charged particles are involved (electrons, probably protons), because they will rapidly decelerate and create brehmstrahlung, so you've traded a charged particle which is easy to deflect with an X ray, which is not easy to reflect. My wife uses plexiglass shields in her lab for this reason, because it gracefully absorbs beta radiation.
Though the general trend of technology is constant progress forward, in certain cases the ancients were able to teach us a thing or two.
Including hyperspace travel and kick-ass plot devices!
Fortunately not everyone shares your view. The world we live in is the way it is (for better or for worse) because it has historical context. We don't live from one moment to the next wondering where our next meal is going to come from. We plan, we dream, we reflect.
http://blogs.lifestyle.aol.ca/2008/06/20/obecalp-placebo-meds-for-kids/ Start them off young!
Certainly the Year of Linux!
New Democratic Party, isn't it? We're not American, or did I not get the memo?
How? As soon as Apple releases a EU version with replaceable batteries, your point will become moot. They did the same thing with Windows XP, and it's not like Microsoft has any competition that needs protection.
There is no magical singularity where the laws of physics break down. There doesn't need to be.
Whatever helps you sleep at night, dude.
Heh... I knew who Roger Penrose was long before I heard of Richard Dawkins, and I suspect that I'll forget who Richard Dawkins soon enough. But I'm biased for being a physicist.
This isn't exactly my field, but I thought the no-hair theorem guaranteed this result. I guess the tricky part is in the transient phase.
Perhaps the target market is those folks whom still run their finger along underneath the words?
Those people are blind, you insensitive clod!