Magnetism coupling

As stated above the SQUID amplifier demands a low inductance Eddy current probe in order to be able to amplify signals up to 1 MHz. Low inductance Eddy current probes can be obtained by reducing the number of turns and by loosing the magnetic coupling between the tums. So magnetic cores should be avoided as well as tight wounded tums. For this purpose planar coils are the best... 

Pumps for Leakage Prevention. When leakage to atmosphere must be contained to essentially 2ero, magnetically coupled or canned motor sealless pumps can be used. These pumps do not have rotating seals between the pumped Hquid and the atmosphere. 

Fig. 13. Magnetically coupled pump, where the outer and inner drives are magnets. A pumped Hquid provides lubrication to bearings of the inner (driven)...

Once the component values have been calculated, the physical construction of the transformer and the PCB layout become critical for the effectiveness of the filter stage. Magnetic coupling due to stray inductive pick-up of high-frequency noise by the traces and components can circumvent the filter all together. Added to this is the fact that the common-mode filter choke looks more and more capacitive above its self-resonance frequency. The net result is the designer needs to be concerned about the high-frequency behavior of the filter typically above 20 to 40 MHz. 

Band L, Bencini A, Benelli C, Gatteschi D, Zanchini C (1982) Spectral-Structural Correlations in High-Spin Cobalt(II) Complexes. 52 37-86 Band L, Bertini I, Luchinat C (1990) The H NMR Parameters of Magnetically Coupled Dimers-The Fe2S2 Proteins as an Example. 72 113-136 Baran EJ, see MuUer A (1976) 26 81-139... 

Contact shifts give information on the electronic structure of the iron atoms, particularly on the valence distribution and on the magnetic coupling within polymetallic systems. The magnetic coupling scheme, which is considered later, fully accounts for the variety of observed hyperfine shifts and the temperature dependence. Thus, through the analysis of the hyperfine shifts, NMR provides detailed information on the metal site(s) of iron-sulfur proteins, and, thanks to the progress in NMR spectroscopy, also the solution structure 23, 24 ). 

Polymetallic systems are magnetically coupled. The magnetic coupling in the simple Heisenberg model can be described by the following Hamiltonian (38-40) ... 

As mentioned previously, in [FegS4] + clusters, the three Fe(III) ions are not completely equivalent. NMR spectroscopy may allow one to locate the iron with the lowest reduction potential, as being the one characterized by the weakest magnetic couplings with the other two irons. However, this is true only if the energetic contributions due to other factors, such as electrostatic effects or solvent accessibility 93), are less important than those due to the magnetic coupling of the... 

Band, L., Bertini, /., Luchinat, C. The HNMR Parameters of Magnetically Coupled Dimers — The FcjSj Proteins as an Example. Vol. 72, pp. 113-136. 

The interplay between magnetic coupling and ST in 2,2 -bipyrimidine (bpym)-bridged iron(ll) dinuclear compounds has been studied by magnetic susceptibility and Fe Mossbauer spectroscopy [24]. The molecular stmctures of [Fe(bpym) (NCS)2]2(bpym) and [[Fe(bt)(NCS)2]2(bpym) (bt = 2,2 -bithiazoline) are shown in Fig. 8.12. The magnetic behavior in the form of XmT versus Tplots, being the... 

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