snorri
Legendary Member
- Location
- East coast, up a bit.
An early symptom of iron deficiency in your diet.
How do I make the robot see me?
- Thread starter MossCommuter
- Start date
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Nope - At the Earth's surface the total intensity varies from 24,000 nanotesla (nT) to 66,000 nT - linkie
The magnetic field typically produced by rare-earth magnets can be in excess of 1.4 Teslas, whereas ferrite or ceramic magnets typically exhibit fields of 0.5 to 1 Tesla
So the magnetic fields associated with the little magnets we get in toys are typically several million times more intense than the one generated by the Earth
but not as intense as Magnatom's work beastie.B.
cyberknght, I wasn't getting at you personally. However, the stuff in that quote is complete and utter mumbo jumbo. Just look at the language that the writer uses, it doesn't make any sense at all.
Bio Negative Magnetic energy
Positive [Bio-South] energy
proper energy to support normalization of health
the field emitted will have a 7-14% aggregate of bio south positive energy
As someone whos job it is to work with very strong magnetic fields and to ensure safety within those fields (this includes static fields, time varying fields and strong radiofrequency pulses), that all of the above statements make absolutely no sense whatsoever, and don't actually describe anything that actually exists. The people who write these depend on the fact that most of the public are not scientists and don't have the time to investigate what these statements actually mean. Why do they use statements like this? Because there is no underlying science to their claims, and the people who write these don't themselves understand science.
Have a look here.
Bio Negative Magnetic energy
Positive [Bio-South] energy
proper energy to support normalization of health
the field emitted will have a 7-14% aggregate of bio south positive energy
As someone whos job it is to work with very strong magnetic fields and to ensure safety within those fields (this includes static fields, time varying fields and strong radiofrequency pulses), that all of the above statements make absolutely no sense whatsoever, and don't actually describe anything that actually exists. The people who write these depend on the fact that most of the public are not scientists and don't have the time to investigate what these statements actually mean. Why do they use statements like this? Because there is no underlying science to their claims, and the people who write these don't themselves understand science.
Have a look here.
So the magnetic fields associated with the little magnets we get in toys are typically several million times more intense than the one generated by the Earth
B.
Aye, but the toy magnets magnetic fields do drop off rather quickly with distance.
There are some great demonstrations you can do to show just how strong the magnetic field is in MRI scanners. The best and safest trick doesn't involve a ferromagnetic material at all (i.e. it isn't attracted to a magnetic field). The good old Aluminuim disk trick. Can anyone work out what happens to such a disk when placed at the edge of a strong field?
The good old Aluminuim disk trick. Can anyone work out what happens to such a disk when placed at the edge of a strong field?
Does it turn into a great big chocolate cake?
No help for this issue - but some lights near me have loop detectors in the ground that are sensitive enough for bikes. The other good thing is that they're not on the road, but on the pavement next to the crossing (toucan). So you just cycle up to the crossing (or take a pushchair or wheelchair) and it pushes the button for you.
Aye, but the toy magnets magnetic fields do drop off rather quickly with distance.
There are some great demonstrations you can do to show just how strong the magnetic field is in MRI scanners. The best and safest trick doesn't involve a ferromagnetic material at all (i.e. it isn't attracted to a magnetic field). The good old Aluminuim disk trick. Can anyone work out what happens to such a disk when placed at the edge of a strong field?
A guess here based on the need for a disk, it being at the edge of a field and watching Professor Eric Laithwaite on the telly when a child.
Assuming that the disk is held at it's axis, does it spin?
Sorry, the fact it is a disk is an unintentional red herring. It's just what we use for demonstration purposes.
A clue, aluminum is a conductor....
Sorry, the fact it is a disk is an unintentional red herring. It's just what we use for demonstration purposes.
A clue, aluminum is a conductor....
aaah but magnetic fields dont go thru aluminium... which is how maglev works.......
surely it doesnt induce a current? I'd have expected it to have 'flown' clean away tbh...
( oh , i was nearly right - ish , after checking via google
)
HLaB
Marie Attoinette Fan
I can't get the link to work but I'd agree with what it suggests; a heavier steel frame bike helps but the positioning is the key to getting it to detect. My old work in Dublin had a inductive loop controling the triggering of the car park exit and you quickly (and safely) got to find out which position you needed to take to get it to detect.
aaah but magnetic fields dont go thru aluminium... which is how maglev works.......
surely it doesnt induce a current? I'd have expected it to have 'flown' clean away tbh...
( oh , i was nearly right - ish , after checking via google
Moving aluminium through a magnetic field induces a current in it. This in itself produces a magnetic field that opposes the main field. Thus it is a bit like trying to push a N and N poles of magnets tgether. They oppose each other. Thus if I place a disk on it edge and it starts falling it will fall very slowly due to this effect. It's a nice safe way to demonstrate the field!
Anyway this is a tad off topic!
Moving aluminium through a magnetic field induces a current in it. This in itself produces a magnetic field that opposes the main field. Thus it is a bit like trying to push a N and N poles of magnets tgether. They oppose each other. Thus if I place a disk on it edge and it starts falling it will fall very slowly due to this effect. It's a nice safe way to demonstrate the field!
Anyway this is a tad off topic!
useful info though, does that mean aluminium frames can track stand really well if you go near the induction loops
..(i guess mri is a static field then? apparently you can heat the aluminium if the field oscillates)
useful info though, does that mean aluminium frames can track stand really well if you go near the induction loops
(i guess mri is a static field then? apparently you can heat the aluminium if the field oscillates)
Mmmm. With a strong enough magnetic field you could levitate. Now that would be a cool trick.
There are changing magnetic fields in MRI as well as the static field. Induced currents leading to burns is always something we need to watch out for!
(It is very rare and with the correct procedures doesn't happen. MRI is very very safe!!)
hackbike 666
Guest
I have a real problem with these lights again...They wouldn't change for me this morning and I ended up arguing with a motorist because he wanted me to push the ped crossing button on the left...I told him it wouldn't work and that I would need to to push the button on the other lights...Am I the thick one was he right or was I right?
The Infra Red? Detector is fitted underneatheth the nearest right hand signal....Im taking an LED lenser tommorow to flash at it and see if that works...They really are the worst lights going but generally during the day they 'see' me.
I would have thought after they rebuilt the bridge at Angel Lane Stratford they would have sorted these blasted lights out...The other new set at the top of the bridge seem to be on a timer and not this hi tech crap that doesn't work...
I take it these are Newham Council lights so perhaps I should report them....
