XPost: sci.electronics.design   
   From: nospam@de-ster.demon.nl   
      
   Bill Sloman  wrote:   
      
   > On 20/02/2026 7:41 am, J. J. Lodder wrote:   
   > > wBill Sloman  wrote:   
   > >   
   > >> On 20/02/2026 12:13 am, J. J. Lodder wrote:   
   > >>> Bill Sloman  wrote:   
   > >>>   
   > >>>> On 19/02/2026 9:56 pm, J. J. Lodder wrote:   
   > >>>>> Bill Sloman  wrote:   
   > >>>>>   
   > >>>>>> On 19/02/2026 7:49 am, Ross Finlayson wrote:   
   > >>>>>>> On 02/18/2026 12:43 PM, Python wrote:   
   > >>>>>>>> Le 18/02/2026 à 20:13, Ross Finlayson a écrit :   
   > >>>>>>>> ..   
   > >>>>>>>>> and, you know, magnetic monopoles, is widely employed   
   > >>>>>>>>> in medical imaging and the like.   
   > >>>>>>>>   
   > >>>>>>>> No.   
   > >>>>>>>   
   > >>>>>>> Resonance imaging (NMR) is a thoroughly different mechanism   
   > >>>>>>> than Roentgen rays.   
   > >>>>>>   
   > >>>>>> But as the name implies, it's nuclei of the atoms involved that   
   > >>>>>> exhibit the resonance. It's a remarkably low energy effect, and you   
   > >>>>>> need remarkably high magnetic fields to get it to give you a   
   > >>>>>> detectable signal.   
   > >>>>>   
   > >>>>> Nevertheless, it is easily demonstrated in the kitchen   
   > >>>>> with some simple electronics.   
   > >>>>   
   > >>>> Sort of.   
   > >>>>   
   > >>>> https://en.wikipedia.org/wiki/Nuclear_magnetic_resonance   
   > >>>>   
   > >>>> There are lots of different ways to exploit nuclear magnetic resonance.   
   > >>>> The earth's magnetic field is high enough to let you devise experiments   
   > >>>> that can demonstrate the effect on a kitchen table.   
   > >>>   
   > >>> Nothing 'sort of'.   
   > >>> You -can- easily demonstrate the effect on the kitchen table.   
   > >>> (at audio frequencies)  Wikipedia is right here.   
   > >>   
   > >> Yes, but we were talking about medical imaging, not nuclear magnetic   
   > >> resonance in general, and your assertion is the irrelevance here, as the   
   > >> text you snipped pointed out.   
   > >   
   > > Which 'we' dear Bill?   
   >   
   > If you can't work that out, you aren't worth talking to.   
   >   
   > > I replied to your   
   > > ===   
   > >>>>> But as the name implies, it's nuclei of the atoms involved that   
   > >>>>> exhibit the resonance. It's a remarkably low energy effect, and you   
   > >>>>> need remarkably high magnetic fields to get it to give you a   
   > >>>>> detectable signal.   
   > > ===   
   > > which is just plain wrong.   
   >   
   > In your ever-so-authoritative opinion.   
   >   
   > > As a matter of fact, zero to ultra-low frequency NMR   
   > > is a flourishing research field these days,   
   >   
   > It's cheap to do, so lots of graduate students get stuck with studying   
   > it. The results of their research don't seem to get published in   
   > high-impact journals.   
      
      
   It is an interesing field of research,   
   because with all external fields screened out   
   you can investigate the spin-spin couplings. [1]   
   (among other things)   
      
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