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3 Magnetic flux in a ferromagnetic body In a ferromagnetic medium with uniform permeability m, the magnetic field vector H is derivable from the magnetic potential Fm by D H ¼ À Á Fm : (1:46) Inside a ferromagnetic medium with uniform magnetization M, the magnetic field H is derived from Eq. 49) vanishes, resulting in r2 Fm ¼ 0: (1:50) Magnetic potential Fm in the above equations plays the same role as electric potential Fe, satisfying the Laplace equation. 1 Comparison of thermophysical behavior where A is the cross-section of the circuit line.

25. Both models predict well the experimental results. 3 Magnetic composities More-compact actuators are highly desirable in a number of applications. This demands even more-compact electric motor and electromagnet systems as sources of driving high-density power where both stator magnets and moving rotors are made of soft and hard magnets with the requirement of high magnetic properties. 3 Composites for sensors and actuators 47 low coercivity Hc at use frequencies f. Those of a permanent magnet are high remanent flux Br or equivalently high Bs, high coercivity Hc, and high magnetic energy (BH)max.

There are two types of biosensing for the pair analyte/recognition element: (i) bio-affinity recognition, and (ii) biometabolic recognition (Dewa and Ko, 1994). 2 MEMS and BioMEMS Electrode Si3N4/SiO2 Piezoelectric actuator Silicon Flow in Fig. 12 Flow out A micro-pump based on a monomorph piezoelectric actuator. receptor–ligand and antibody–antigen. In the latter, the analyte and any reactants are changed to other product molecules; examples are enzyme– substrate reaction, and the metabolism of molecules with micro-organisms.

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