Not true, i've read many articles on the strength required, and current carbon nanotube research is within the same order of magniture of required strength or better. We just have to learn how to make a composite cable in bulk.
Fiber materials such as graphite, alumina, and quartz have exhibited tensile strengths greater than 20 GPa... The desired strength for the space elevator is about 62 GPa... Carbon nanotube exhibits extraordinary mechanical properties: the estimated tensile strength is 200 Giga-Pascals.
I've also read about butane as a working fluid in turbines. Once again, it is closed cycle.
The main point here is the heat of vaporisation. It takes a large amount of energy to vaporise water, and that energy is wasted. It's the pressurisation of the high temp steam that does the work.
With butane, the heat of vaporisation is much lower, and so is it's thermal capacity, so you get much more high temp/pressure gas for the same energy.
Rail guns utilise the effects of high current, not voltage. Sure, you can achieve this with capacitors, but i think this application would be far better suited to an inductive storage.
So...what about if we had a large bucket of pre-entangled particles?
We could take these with us somewhere, then perform the collisions and teleport states, thus communicating a limited amount of data back at FTL speeds.
Now I realise there are current limits on how long entanglement lasts, plus all sort of quantum error correction required, but essentially it *could* be feasible, no?
For any long range ourdoor uses, 802.11b still kicks g's arse.
G needs higher SNR to work well, and it's coding scheme is more succeptible to interference. Fine for coffee shot or home access, but no good for 20km links.
Surely the easier solution is to charge the companies who are advertising their products via spam, not the elusive spammers themselves. Two good reasons are:
1) The spam obviously has to have a link back to the vendor in order to make sales. 2) If there is no demand for it, spam will stop.
3V at high currents can cause large voltages when disrupted. Essentially inductive components will produce a very large EMF when the change in current is rapid - easily enough to spark.
High currents can also cause smaller components to melt and possibly burn.
Unpolarised is fine in double-insulated equipment, but in other appliances, having unpolarised plugs is dangerous.
This is because sometimes the neutral is tied to earth, so if you swap it around, the chassis between two appliances can have the whole mains potential difference.
I agree. Look at the succes sof Counterstrike. Whilst I thought the half life/quake2 engine still looked pretty good, it arguably trailed behind new engines in terms of visual quality.
However, CS was a huge hit, not because of the graphics, but because of the great gameplay. The same can be said about a number of community driven mods.
Personally, i hate new games coming out with such high system requirements that I have to upgrade. I really dont want to have to spend $500 on video cards every six months just to keep up.
Yes, but at high speed, you need more downforce to keep the car on the road. Producing downforce also causes drag.
So yes, whilst you can get very aerodynamic things to go very fast, they wont be turning corners like that. For race car performance, you need horsepower to compensate for the drag of the wings.
Slashdot Mirror
Using an accelerometer, it is trivial to integrate the acceleration over time to get velocity, and you can then integrate that to get distance.
If you think that requires some sophisticated hardware - think again. You can integrate an analog signal with a something as simple as a capacitor.
Not true, i've read many articles on the strength required, and current carbon nanotube research is within the same order of magniture of required strength or better. We just have to learn how to make a composite cable in bulk.
From Nasa
Fiber materials such as graphite, alumina, and quartz have exhibited tensile strengths greater than 20 GPa...
The desired strength for the space elevator is about 62 GPa...
Carbon nanotube exhibits extraordinary mechanical properties: the estimated tensile strength is 200 Giga-Pascals.
Not to mention many bottles of spirits, containing around 50% ethyl alcohol.
I've also read about butane as a working fluid in turbines. Once again, it is closed cycle.
The main point here is the heat of vaporisation. It takes a large amount of energy to vaporise water, and that energy is wasted. It's the pressurisation of the high temp steam that does the work.
With butane, the heat of vaporisation is much lower, and so is it's thermal capacity, so you get much more high temp/pressure gas for the same energy.
Rail guns utilise the effects of high current, not voltage. Sure, you can achieve this with capacitors, but i think this application would be far better suited to an inductive storage.
Regardless of what energy you use, conservation of momentum always applies - you need to apply and exernal force to overcome this.
For a ship, this would be the thrusters pushing against the water.
So...what about if we had a large bucket of pre-entangled particles?
We could take these with us somewhere, then perform the collisions and teleport states, thus communicating a limited amount of data back at FTL speeds.
Now I realise there are current limits on how long entanglement lasts, plus all sort of quantum error correction required, but essentially it *could* be feasible, no?
For any long range ourdoor uses, 802.11b still kicks g's arse.
G needs higher SNR to work well, and it's coding scheme is more succeptible to interference. Fine for coffee shot or home access, but no good for 20km links.
Surely the easier solution is to charge the companies who are advertising their products via spam, not the elusive spammers themselves. Two good reasons are:
1) The spam obviously has to have a link back to the vendor in order to make sales.
2) If there is no demand for it, spam will stop.
Flash has limited read/write cycles. At this point they are more expensive than RAM, and slower than HDD, so I dont see the point.
The overhead is not that bad - headers are around 50-100 bytes out of a (generally) maximum 1500byte packet.
That puts the efficiency around 93-96% for large packets (eg file downloads).
How about drinking the coffee slower? Say half a cup straight away, then nurse it for another 2 hours?
"3 volts can arc when the curent is high enough"
It sure can.
3V at high currents can cause large voltages when disrupted. Essentially inductive components will produce a very large EMF when the change in current is rapid - easily enough to spark.
High currents can also cause smaller components to melt and possibly burn.
It's the same reason why plasic buckets of any kind are banned on oil rigs.
boom!
Oh my god. Im am suprised you cant work that one out for yourself. I pray i never have to fill up my car next to you.
If you dont know better, WHY DONT YOU READ THE WARNING SIGNS?
Unpolarised is fine in double-insulated equipment, but in other appliances, having unpolarised plugs is dangerous.
This is because sometimes the neutral is tied to earth, so if you swap it around, the chassis between two appliances can have the whole mains potential difference.
Living in a metric country like Australia, I have no problem with the celcius rating for weather.
Strangely, i find it usefull knowing that a temp of 0 degrees is literally freezing, and 100 is bloody boiling.
Your argument is ridiculous. The reference points are all arbitary, arguing one based on *your* familiarity is narrow minded.
It's actually called the *ISO* paper system. Metric has nothing to do with it.
I see it more of a protest. I have no guilty conscience, do you, AC?
I agree. Look at the succes sof Counterstrike. Whilst I thought the half life/quake2 engine still looked pretty good, it arguably trailed behind new engines in terms of visual quality.
However, CS was a huge hit, not because of the graphics, but because of the great gameplay. The same can be said about a number of community driven mods.
Personally, i hate new games coming out with such high system requirements that I have to upgrade. I really dont want to have to spend $500 on video cards every six months just to keep up.
Im sure a kangaroo crashing through your windscreen at 250mph would be an intersting adventure.
Yes, but at high speed, you need more downforce to keep the car on the road. Producing downforce also causes drag.
So yes, whilst you can get very aerodynamic things to go very fast, they wont be turning corners like that. For race car performance, you need horsepower to compensate for the drag of the wings.
All we need now is a robot that will add punctuation!
Many OS's have Halt idling built in. You havent neccesarily needed separate software since win98.
You didnt read the article, did you?