Re:Easiest way
on
Portable Hubs?
·
· Score: 1, Flamebait
Seriously, somebody else posted a link to a genuine battery-powered hub. You should check that out.
Yeah, I did. You're a total spanner. They took a standard hub and connected a battery to it, just like I was suggesting. It's a smaller one, and so it doesn't last as long. But if you'd actually read my posting, you'd note that I only gave a car battery as an example. You're a total div, you know that?
I just checked maplins- a 12 volt 6 ampere hour lead-acid battery weighs 1.6 kg. Heavy, but not outrageous. That would last 4 hours or more, which is plenty. And there's plenty lighter than that.
You're off by a factor of 15 with your weight.
A car battery on the other hand is good for a week-long party.
Get a 12 volt battery and an inverter (that's a 12 volt DC to 120 volt AC converter) and then plug it in!
Or, more simply, I just checked out my Netgear MR314 (wireless router, but has 4 wired ethernet ports). It has a DC 12 volt power supply on it (rated at 1.2 amps), so in principle you can run it off a (car?) battery directly. Car batteries come in different sizes, are rated at ~60-200 ampere hours, so you can size your battery on portability basis and on how long you want it to last.
If you do use a car battery, check the voltage before you connect it, 12.5 volts or so should be OK, but car batteries are only around 12 volts, I've seen them go as high as 13.5 volts (particularly while charging), that could fry your router. So you could connect it up to your car, but it might not be a good idea to leave the engine running in that case.
They've done it in an adult. That means that they can inject genes into a patch of skin, and that patch of skin can do an extremely wide variety of things.
For example, it can turn colour depending on the level of insulin, or temperature, or it can produce insulin, or growth hormone (if you are lacking in it). Or it could produce antibiotics, or other chemicals; vitamins for example.
You've missed the point. The aim of the experiment isn't to make a small patch of fur on a mouse go green, that's pretty useless. The real aim of the experiment is to inject a set of genes into a live animal, so that cells take up the genes and grow.
They only used the flourescent marker to show that they'd successfully pushed the genes into the cells. It's not at all easy to push genes into a grown animal, the cell walls tend to not let any proteins in. In this case, they've apparently succeeded quite well.
Getting genes into an adult animal is a very important step forward. Some diseases may be curable with this kind of technique, for example, type-1 diabetes; which kills millions of people, might be tackled by treating a small area of skin to produce insulin at the right times.
This was genetic engineering wayyy after gestation. They took a piece of fully grown skin and treated it, then transplanted it onto a mouse.
There are practical problems about going near an animal that weighs tonnes and never forgets with sharp pointy instruments, but that's another question, and easily answered one at that.
For example, if they embed advertising in the track- it could pay for itself that way. Ok, sure you could strip it out, but a lot of people may be quite happy to not do that for the added benefit of not paying cash for stuff, legally. Those that don't care- well, you're not going to be getting money from those vultures anyway.
People have been predicting the death of the music industry for decades. It's still doing very well. Don't forget- the music industry really is only a money lending industry. They just need to come up with new business models for selling their existing products; or branch out into new products.
but I think it was like a physicist trying to answer: "Why is it I can hold a hot steel ball that is 2000 degrees without getting burned?"
Yeah, it's dead like that, except he wasn't holding it, it wasn't a steel ball, and he wore gloves.
The answer is "You can't".
Oh? And you've tried this I take it?
I mean come on. There's lots going on here:
a) what's the heat conductivity of lava? Not nearly as high as a steel ball.
b) the leaves and the food are going to steam. Steam forms a good insulating layer, meaning little heat will reach the food. In an oven this steam is removed by vents.
c) the heat capacity of the food is likely to be higher than the rock. Don't forget that water has one of the higher heat capacities, and food is usually mostly water by weight.
The US, between immigration and a rebounding birth-rate, will outstrip the population of Europe before 2050, if current trends hold. But net usage should be around 99% by then throughout the developed world.
Yeah, but you're still never going to be in majority in the world ever again. India and China are coming online, and boy are they going to be online;-)
It's probably a reference to oil running out or something. The idea of an industrial society destroying itself by using up the stuff that keeps it going.
Or it could be a refence to biological aging.
Or maybe the guy hates computers and loves torturing them.
However, by far the most likely reason is that the artist thought it was a cool-sounding idea and it would be likely to bring him cheap advertising. Well, it worked.;-)
Well, assume every final position is won or lost or drawn. That means that every position that leads to one of the final position- the player that makes the last move will pick the best move they can- win if they can, or draw. Otherwise they will lose. That's called perfect play.
So you can assign win/draw/lose to every move that leads to one of these positions, and so on.
By induction, every position is won, drawn or lost for each player, if they play perfectly. Geddit?
Of course if one player plays perfectly, and the other doesn't then the perfect player can often snatch victory or a draw from the jaws of defeat, cos the imperfect player often makes an inferior move. And, usually both are imperfect.
My gut feel is that he might get 32 levels if he's very lucky, peak-peak. I don't think it matters how many bits the scanner resolves to, the spatial accuracy is what matters.
The accuracy of the scanners head is what counts, and that isn't going to be good enough for what he wants to do, he needs a much higher resolution scanner.
I don't think the problem is Nyquist. The big problem is how many dots represent the amplitude... From the image it looks like about 5 or 10. That corresponds to around 4 bits resolution... not exactly 'HiFi'.
Perhaps a little more if he can process the shading (a sort of inverse smoothing); but I doubt he'd ever get more than 8 bits resolution. This compares rather unfavourably with CD quality (around 16 bits), or even mp3!
Theoretically you could get a mono signal out of even a stereo recording. I'd probably try partially filling the tracks to a constant depth with some sort of white material, then scanning it at very high resolution.
Probably work. It might be a bit destructive though. Alternatively it would help a lot if he lit it with different colours from different directions. He'd be able to see the grooves more easily that way.
Also, I'm assuming that the record is usually cut with a V-shaped cutter. If so, the width of the groove would give you the l-r signal and the position of the center of the track would give you the l+r signal. All in all, it looks doable; it's limited by the scanner resolution only I think.
Everyone is dissing the guy, but he came up with a really neat trick IMHO.
The USA take responsibility for launches by Americans from any point in the world, not just America. You need a launch license if you are American.
Launching for Baikonur must be about the easiest license to get though, since the Russians have already shown that the chances of landing on someone is miniscule from there; and that's what they're interested in ensuring. Otherwise under international law the US government is financially responsible for any losses.
Yes. Re:Doesn't this just slow down the wardriving
on
Wireless Camouflage?
·
· Score: 4, Insightful
The packets that announce an AP consume a tiny fraction of your available bandwidth. There should not be a noticable drop in bandwidth.
That's probably its achilles heal. If you measure which AP point has the most traffic, you've blown past any illusion of security this gives you.
you add in VPN as step 6a) you are down to about 56k speeds right?
Well... I personally was getting 80 kilobyte/s speeds yesterday, so... no. But it's mainly processor dependent, and I'm not running anything particularly special, 650 Mhz pentium. What the heck are you running VPN on? A P100???
so do i mount the directional antenna on my head and make sure i always look north?
If you want to! You'll look silly, and it won't help, but you can if you want to;-)
Hint: directional antennas can be multiple fixed antennas that are electrically switched to form a 'phased array'. Similar to what the military use for their radar systems on aircraft.
Think about it. You plug a wifi card into your laptop and start surfing. Battery life cuts from 4 hours to 2.
Nah. I haven't seen any degradation of battery life at all.
but it averages 100 microwatts/sec regardless of whether it's in use or not.
Ok;-) My laptop powersupply is in rated at 48 watts, who cares about a few hundred microwatts? The phone issue is very different, batteries are much smaller in a phone. My laptop battery is about the same size or bigger than a cell phone;-)
What you say makes good sense for a cell phone though.
I highly doubt that an 802.11 mesh will ever provide that much bandwidth - especially once things start relaying in many directions at once.
Ok, first you gotta realise that 802.11b (even) by access standards is fast!
With a contention ratio of 50, and giving each user 576K you get:
11,000,000 / 576000 * 50 = 954 users
That's on a single connection, within say 100m of some user.
So even 11b can allow enormous numbers of people 'broadband' capabilities.
Secondly, that's with current technology only- a more advanced technology would allow multiple networks on the same frequency by using directional aerials- this can multiply up the usage maybe 20 times. Then there's the fact that even 11b allows atleast 3 different channels (in practice). We're talking thousands of people, potentially,in little old 1b land alone.
Anyway this could work for dense areas but screws over the people living in the country - worse still, it's not dependable.
Yes, this is the issue. WiFi is basically line of sight, or 100m range. However that's a regulatory issue, mostly. The only reason that WiFi is so restricted is due to power limits. If the users were allowed to shout louder, they would be able to go further, and then country people would be in range of each other anyway (chances are).
What if you need to make an emergency call and nobody is within range?
Cell phone? Who says WiFi is for emergency calls anyway?
Slashdot Mirror
Yeah, I did. You're a total spanner. They took a standard hub and connected a battery to it, just like I was suggesting. It's a smaller one, and so it doesn't last as long. But if you'd actually read my posting, you'd note that I only gave a car battery as an example. You're a total div, you know that?
You're off by a factor of 15 with your weight.
A car battery on the other hand is good for a week-long party.
Or, more simply, I just checked out my Netgear MR314 (wireless router, but has 4 wired ethernet ports). It has a DC 12 volt power supply on it (rated at 1.2 amps), so in principle you can run it off a (car?) battery directly. Car batteries come in different sizes, are rated at ~60-200 ampere hours, so you can size your battery on portability basis and on how long you want it to last.
If you do use a car battery, check the voltage before you connect it, 12.5 volts or so should be OK, but car batteries are only around 12 volts, I've seen them go as high as 13.5 volts (particularly while charging), that could fry your router. So you could connect it up to your car, but it might not be a good idea to leave the engine running in that case.
For example, it can turn colour depending on the level of insulin, or temperature, or it can produce insulin, or growth hormone (if you are lacking in it). Or it could produce antibiotics, or other chemicals; vitamins for example.
They only used the flourescent marker to show that they'd successfully pushed the genes into the cells. It's not at all easy to push genes into a grown animal, the cell walls tend to not let any proteins in. In this case, they've apparently succeeded quite well.
Getting genes into an adult animal is a very important step forward. Some diseases may be curable with this kind of technique, for example, type-1 diabetes; which kills millions of people, might be tackled by treating a small area of skin to produce insulin at the right times.
True. But so's doing untried procedures on humans.
There are practical problems about going near an animal that weighs tonnes and never forgets with sharp pointy instruments, but that's another question, and easily answered one at that.
For example, if they embed advertising in the track- it could pay for itself that way. Ok, sure you could strip it out, but a lot of people may be quite happy to not do that for the added benefit of not paying cash for stuff, legally. Those that don't care- well, you're not going to be getting money from those vultures anyway.
People have been predicting the death of the music industry for decades. It's still doing very well. Don't forget- the music industry really is only a money lending industry. They just need to come up with new business models for selling their existing products; or branch out into new products.
Good job you're not prone to that trait then!
but I think it was like a physicist trying to answer: "Why is it I can hold a hot steel ball that is 2000 degrees without getting burned?"
Yeah, it's dead like that, except he wasn't holding it, it wasn't a steel ball, and he wore gloves.
The answer is "You can't".
Oh? And you've tried this I take it?
I mean come on. There's lots going on here:
a) what's the heat conductivity of lava? Not nearly as high as a steel ball.
b) the leaves and the food are going to steam. Steam forms a good insulating layer, meaning little heat will reach the food. In an oven this steam is removed by vents.
c) the heat capacity of the food is likely to be higher than the rock. Don't forget that water has one of the higher heat capacities, and food is usually mostly water by weight.
If they've got any sense they'll do a cleanroom implementation of the problem areas.
I would ;-)
Yeah, but you're still never going to be in majority in the world ever again. India and China are coming online, and boy are they going to be online ;-)
Yeah, but you're forgetting that rocket science isn't rocket science anymore ;-)
Or it could be a refence to biological aging.
Or maybe the guy hates computers and loves torturing them.
However, by far the most likely reason is that the artist thought it was a cool-sounding idea and it would be likely to bring him cheap advertising. Well, it worked. ;-)
So you can assign win/draw/lose to every move that leads to one of these positions, and so on.
By induction, every position is won, drawn or lost for each player, if they play perfectly. Geddit?
Of course if one player plays perfectly, and the other doesn't then the perfect player can often snatch victory or a draw from the jaws of defeat, cos the imperfect player often makes an inferior move. And, usually both are imperfect.
The accuracy of the scanners head is what counts, and that isn't going to be good enough for what he wants to do, he needs a much higher resolution scanner.
Perhaps a little more if he can process the shading (a sort of inverse smoothing); but I doubt he'd ever get more than 8 bits resolution. This compares rather unfavourably with CD quality (around 16 bits), or even mp3!
Probably work. It might be a bit destructive though. Alternatively it would help a lot if he lit it with different colours from different directions. He'd be able to see the grooves more easily that way.
Also, I'm assuming that the record is usually cut with a V-shaped cutter. If so, the width of the groove would give you the l-r signal and the position of the center of the track would give you the l+r signal. All in all, it looks doable; it's limited by the scanner resolution only I think.
Everyone is dissing the guy, but he came up with a really neat trick IMHO.
Launching for Baikonur must be about the easiest license to get though, since the Russians have already shown that the chances of landing on someone is miniscule from there; and that's what they're interested in ensuring. Otherwise under international law the US government is financially responsible for any losses.
That's probably its achilles heal. If you measure which AP point has the most traffic, you've blown past any illusion of security this gives you.
Well... I personally was getting 80 kilobyte/s speeds yesterday, so... no. But it's mainly processor dependent, and I'm not running anything particularly special, 650 Mhz pentium. What the heck are you running VPN on? A P100???
"A billion here, a billion there, sooner or later it adds up to real money."
If you want to! You'll look silly, and it won't help, but you can if you want to ;-)
Hint: directional antennas can be multiple fixed antennas that are electrically switched to form a 'phased array'. Similar to what the military use for their radar systems on aircraft.
Nah. I haven't seen any degradation of battery life at all.
but it averages 100 microwatts/sec regardless of whether it's in use or not.
Ok ;-) My laptop powersupply is in rated at 48 watts, who cares about a few hundred microwatts? The phone issue is very different, batteries are much smaller in a phone. My laptop battery is about the same size or bigger than a cell phone ;-)
What you say makes good sense for a cell phone though.
Ok, first you gotta realise that 802.11b (even) by access standards is fast!
With a contention ratio of 50, and giving each user 576K you get:
11,000,000 / 576000 * 50 = 954 users
That's on a single connection, within say 100m of some user.
So even 11b can allow enormous numbers of people 'broadband' capabilities.
Secondly, that's with current technology only- a more advanced technology would allow multiple networks on the same frequency by using directional aerials- this can multiply up the usage maybe 20 times. Then there's the fact that even 11b allows atleast 3 different channels (in practice). We're talking thousands of people, potentially,in little old 1b land alone.
Anyway this could work for dense areas but screws over the people living in the country - worse still, it's not dependable.
Yes, this is the issue. WiFi is basically line of sight, or 100m range. However that's a regulatory issue, mostly. The only reason that WiFi is so restricted is due to power limits. If the users were allowed to shout louder, they would be able to go further, and then country people would be in range of each other anyway (chances are).
What if you need to make an emergency call and nobody is within range?
Cell phone? Who says WiFi is for emergency calls anyway?