Meter readers only read the meters they know about. There is nothing to stop me climbing up the power pole outside my house and clamping my own cables on to the mains supply. I would need to know what I was doing (this guy did, and I probably do to a smaller degree) and I would have to live with the possibility of death by electrocution. Somebody might notice the connection one day, most likely a repair crew working on a different job. It would be hard to hide because they would just follow the cable.
But say I had an electric vehicle with cleverly designed arms (like the gear on the top of a tram) which could reach up to the power lines, charge up, then fold up again. I could probably get away with doing that for years in the middle of the night, especially if I had signs on my vehicle suggesting some official status.
It costs a lot of fuel. About 4km/s of velocity change to match orbits with the ISS when you return from the moon, but if you can't do that burn then you have return to Earth so you need a heat shield anyway.
So yeah, maybe the ISS is a good place to integrate a vehicle like this but the best way seems to fly it around the moon then straight to Earth.
This type of prediction is unnecessary and not very useful to air traffic controllers, particularly in Europe,
I assume you are referring to the simple example I gave above about trajectories intersecting volumes. Its actually really useful stuff though perhaps not if STCA is your whole business. OTH if your business is avoiding controlled flight into terrain then the example I gave might be more relevant.
That said my example was more intended to point out the ways in which real world coordinate systems could be better handled in OSS, and the applications which might exist in (say) games and UAVs.
Lets say you want to build UAV to fly significant distances around the world. It is going to have to fly a great circle trajectory and it will have to understand the volumes of airspace it is flying through. Airspace is a bit like the skin on a apple. It can't be treated as a simple Cartesian volume the way most simple games do it. The curvature of the Earth varies from place to place. This also affects your ground track.
So your UAV will have to follow a route through the skin of the apple, so to speak, avoiding known danger spots, sometimes by flying above or below them. To do this it will need a library which can do coordinate conversions, and that is what kinematics do.
I work in air traffic control and kinematics are a big deal for us. This is the software which takes care of coordinate systems, motion and transformations. Say you have a vehicle with a particular WGS84 coordinate. Its moving at a particular speed in a particular direction relative to true north. After one hour where will it be in three dimensions relative to its original position? How much distance will it have covered? What happens if its trajectory went within two metres of the south pole? What path in 3D will it follow if it maintains a constant altitude above the datum along the way?
Ok now say it is not allowed to fly into (say) North Korea which has a particular shape. How can you project its path forwards to determine if it goes into the air space over that country?
And so on. Its bloody complicated stuff and I reckon a lot of open source software would benefit from a library which did this. Ideal for a maths guy.
The VW DSI gearbox sits in neutral until the driver presses the accelerator. Then it waits 500ms, then it drops the clutch. By this time the driver has pressed the accelerator all the way down and is wondering why the car isn't moving. Then the clutch drops and you take off with screaming wheels. Not good.
The ICE run flat chat is quite efficient but if you want extra power to overtake or climb a hill its not there. The expected power output has to be built into the initial design, which will make it bad to drive.
My wife has bought a VW Jetta with a dual clutch DSI transmission. Effectively a manual gear box with a computer deciding when to shift. I long for a slushbox. Our old three speed corolla was a far better car.
Why dont they have the ICE drive the generator which then drives the electric motor which drives the wheels?
Its okay for trains which don't have to overtake on the highway. I suspect that design would be too inefficient to deliver the necessary bursts of power.
Well, one that had interchangeable power plant modules would make sense... going on a road trip? Take out the extended battery module, put in the ICE engine module.
I think you need to do the numbers on that one. ICE -> wheels is more efficient than ICE -> generator -> electric motor -> wheels, so you would need a bigger generator than the original ICE engine.
Imagine how bad the Tesla would be if it had to lug around a petrol engine for situations where the batteries were empty. I am sure that would cut the electric range in half, at best.
"Now, these routes have been blocked. The possibility of information leaking is almost impossible now," Salehi was quoted as saying.
I am frankly amazed that anybody would risk getting caught spying in Iran given that they were going to stone a woman to death because she may or may not have cheated on her husband after he died of natural causes. Or is it a double standard: one woman commits a sex crime and they go all mediaeval on her but one of the guys steals nuclear secrets and gets a slap on the wrist?
Or maybe they had to promise "window" apps to their leaders and will deliver apps which do indeed have "windows", just not the microsoft kind. I doubt anybody will notice the difference.
Its more the ubuntu infrastructure for me. It tries to use the Australian mirror for updates but the mirror seems incomplete so I get a lot of warnings and failed upgrades.
Has anyone given it a good testing? I've noticed a horrible trend that Canonical tends to rush their releases these days, especially today. Trying to hit the 10/10/10 deadline makes me wonder what they've left broken to meet their target date.
I tried the release candidate last weekend (most likely identical to this release) while building a system for my mum. I couldn't get X to work at all but thats on an older compaq laptop. I will upgrade two other laptops tonight. Cross fingers but I am not really worried.
Slashdot Mirror
Meter readers only read the meters they know about. There is nothing to stop me climbing up the power pole outside my house and clamping my own cables on to the mains supply. I would need to know what I was doing (this guy did, and I probably do to a smaller degree) and I would have to live with the possibility of death by electrocution. Somebody might notice the connection one day, most likely a repair crew working on a different job. It would be hard to hide because they would just follow the cable.
But say I had an electric vehicle with cleverly designed arms (like the gear on the top of a tram) which could reach up to the power lines, charge up, then fold up again. I could probably get away with doing that for years in the middle of the night, especially if I had signs on my vehicle suggesting some official status.
Why do we keep electing these fools?
Because people who are not fools have better things to do with their time.
It costs a lot of fuel. About 4km/s of velocity change to match orbits with the ISS when you return from the moon, but if you can't do that burn then you have return to Earth so you need a heat shield anyway.
So yeah, maybe the ISS is a good place to integrate a vehicle like this but the best way seems to fly it around the moon then straight to Earth.
Its solved but as far as I know all the solutions are proprietary. An OSS implementation would be handy now that games are becoming more realistic.
Since the poster is a maths guy I was hoping he could design the whole thing and (as you say) get some coders in on the software production.
This type of prediction is unnecessary and not very useful to air traffic controllers, particularly in Europe,
I assume you are referring to the simple example I gave above about trajectories intersecting volumes. Its actually really useful stuff though perhaps not if STCA is your whole business. OTH if your business is avoiding controlled flight into terrain then the example I gave might be more relevant.
That said my example was more intended to point out the ways in which real world coordinate systems could be better handled in OSS, and the applications which might exist in (say) games and UAVs.
Lets say you want to build UAV to fly significant distances around the world. It is going to have to fly a great circle trajectory and it will have to understand the volumes of airspace it is flying through. Airspace is a bit like the skin on a apple. It can't be treated as a simple Cartesian volume the way most simple games do it. The curvature of the Earth varies from place to place. This also affects your ground track.
So your UAV will have to follow a route through the skin of the apple, so to speak, avoiding known danger spots, sometimes by flying above or below them. To do this it will need a library which can do coordinate conversions, and that is what kinematics do.
I work in air traffic control and kinematics are a big deal for us. This is the software which takes care of coordinate systems, motion and transformations. Say you have a vehicle with a particular WGS84 coordinate. Its moving at a particular speed in a particular direction relative to true north. After one hour where will it be in three dimensions relative to its original position? How much distance will it have covered? What happens if its trajectory went within two metres of the south pole? What path in 3D will it follow if it maintains a constant altitude above the datum along the way?
Ok now say it is not allowed to fly into (say) North Korea which has a particular shape. How can you project its path forwards to determine if it goes into the air space over that country?
And so on. Its bloody complicated stuff and I reckon a lot of open source software would benefit from a library which did this. Ideal for a maths guy.
Well, sony already make phones and some of them run android.
0-click ordering
Its called Government.
The VW DSI gearbox sits in neutral until the driver presses the accelerator. Then it waits 500ms, then it drops the clutch. By this time the driver has pressed the accelerator all the way down and is wondering why the car isn't moving. Then the clutch drops and you take off with screaming wheels. Not good.
The ICE run flat chat is quite efficient but if you want extra power to overtake or climb a hill its not there. The expected power output has to be built into the initial design, which will make it bad to drive.
My wife has bought a VW Jetta with a dual clutch DSI transmission. Effectively a manual gear box with a computer deciding when to shift. I long for a slushbox. Our old three speed corolla was a far better car.
Why dont they have the ICE drive the generator which then drives the electric motor which drives the wheels?
Its okay for trains which don't have to overtake on the highway. I suspect that design would be too inefficient to deliver the necessary bursts of power.
Well, one that had interchangeable power plant modules would make sense... going on a road trip? Take out the extended battery module, put in the ICE engine module.
I think you need to do the numbers on that one. ICE -> wheels is more efficient than ICE -> generator -> electric motor -> wheels, so you would need a bigger generator than the original ICE engine.
Imagine how bad the Tesla would be if it had to lug around a petrol engine for situations where the batteries were empty. I am sure that would cut the electric range in half, at best.
"Now, these routes have been blocked. The possibility of information leaking is almost impossible now," Salehi was quoted as saying.
I am frankly amazed that anybody would risk getting caught spying in Iran given that they were going to stone a woman to death because she may or may not have cheated on her husband after he died of natural causes. Or is it a double standard: one woman commits a sex crime and they go all mediaeval on her but one of the guys steals nuclear secrets and gets a slap on the wrist?
I don't believe they exist.
Or maybe they had to promise "window" apps to their leaders and will deliver apps which do indeed have "windows", just not the microsoft kind. I doubt anybody will notice the difference.
With a four year life span I assume.
Its good to have a spare handy, in case the first one blows up.
You GOT to be kidding.
Its more the ubuntu infrastructure for me. It tries to use the Australian mirror for updates but the mirror seems incomplete so I get a lot of warnings and failed upgrades.
Has anyone given it a good testing? I've noticed a horrible trend that Canonical tends to rush their releases these days, especially today. Trying to hit the 10/10/10 deadline makes me wonder what they've left broken to meet their target date.
I tried the release candidate last weekend (most likely identical to this release) while building a system for my mum. I couldn't get X to work at all but thats on an older compaq laptop. I will upgrade two other laptops tonight. Cross fingers but I am not really worried.
Surely we've learnt to stop using two digits for our years?
Clearly we haven't. Now stop calling me Shirley!
Roger Roger.
Wrong article?