Magnetic toys

Industrial uses include automotive, small, close fitting parts in machinery, hardware, speaker magnets, toys, and sporting goods. Specific industrial applications include ... 

Figure 13 Snapshots of a portable NMR system serving as a science toy and an education tool. H NMR experiments in water performed (A) at the author s home, and (B and C) in a class room at University of Fukui. A 1 T permanent magnet was used, and the H resonance frequency was 42.6 MHz.

Considering any of these paradigms, a minimal goal for toy models would be to manipulate the quantum dynamics of a small number of spin levels , and that requires a known and controlled composition of the wavefunction, sufficient isolation and a method for coherent manipulation. As illustrated in Figure 2.13, the first few magnetic states of the system are labelled and thus assigned qubit values. The rest of the spectrum is outside of the computational basis, so one needs to ensure that these levels are not populated during the coherent manipulation. 

Cellulose acetate (CA) and Cellulose acetate butyrate (CAB) are, contrary to the polymers mentioned so far, not fully synthetic, but derivates of vegetable cellulose. They are strong, tough and well processable materials, used in many household- and technical applications, such as hammer heads, magnetic tape, toys etc. CAB has a higher form stability than CA, and is used in automotive accessories and in pipes. 

Small pieces find many diverse applications, for example in toys, door latches, display boards, TV tube correction magnets, etc., and the plastic composite variety is best known as a refrigerator door seal (Fig. 9.59(c)). 

For example, you can take some of your favorite toys or figurines. Add peel and stick magnets to the back of them. You can also laminate your drawings and turn them into magnets as well. 

In the vector formalism of Figure A6-2, the effect of chemical shifts (differences in Lar-mor frequencies) is represented by the rotation of a vector in the xy plane from a position on the y axis (not shown) to one ahead of it. The coordinate system is rotating around the z axis at the reference frequency coj., so that the frequency of the magnetization vector moves away from the axis at a rate Aco = (w — tOy), subtending an angle of (Aco)r with the y axis. For simplicity, we will drop the A and refer both to the frequency of the nucleus and its difference from the reference frequency as co, as in eq. A6-2 (corresponding actually to the special case of o)r — 0). In the product operator formalism, the effect of chemical shifts is represented by the operation of the Hamiltonian term HP on magnetization, illustrated for the three Cartesian coordinates by the expressions... 

Question 5.1. Place a toy ship into a bathtub. Does the water level rise now the toy ship or does sink Is the force of gravity shielded by the surrounding liquid, for instance similar as the magnetic field in nuclear magnetic resonance (shielding effect) In nuclear magnetic resonance, the field is not really shielded, but rather overlaid. 

The Mn-Mn separation in DyMn2 is exactly at its critical value. In consequence, it was shown by neutron diffraction (Ritter et al. 1991) that below the Curie temperature of Jc=45K only one out of four (of the crystallographic equivalent) Mn atoms possess a magnetic moment (fiua = 1-4/4b). These spins are ferromagnetically ordered. The Dy sublattice forms a spin-canted FM structure with /toy = 8.8/tB. The Mn atoms that... 

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