Motional Leg

From the expression in Eq. (19) most forms of equivalent circuit models of piezoelectric elements may be found. The Van Dyke circuit [14] is the simplest, using discrete electrical components combined to approximate the piezoelectric element s behavior. I tis used to represent the electrical irrqtedance about one resonance of a freely suspended piezoelectric element, using a shunt capacitor in parallel with an inductor, resistor, and capacitor placed in series to represent the motional or resonance behavior of the element. A multivibrator Van Dyke model may be formed by adding additional motional legs, each representing another resonance. Since it lacks any explicit treatment of the output force and velocity, it is not especially useful beyond electrical characterization (see... 

When dextromethorphan is administered with the monoamine oxidase inhibitors (see Chap. 31), patients may experience hypotension, fever, nausea, jerking motions to the leg, and coma... 

Properly designed process equipment, taking Into account all the marine vessel motions, Is essential to ensure process quality specifications are met and onstream time 1s maximized. The motions of tankers and semisubmerslbles are most severe and consequently the design of the process equipment for these applications has received the most attention. However, the technology can be utilized to Improve the performance of process equipment on structures such as guyed towers and tension leg platforms which only move 1n one plane and generally with lower amplitudes. 

Temporary circulation pumps are often necessary, as permanently installed pumps may be unsuitable or unable to provide the velocity necessary for flushing and cleaning work. Typically the water velocity necessary is 6 to 9 ft/sec (2 to 3 m/sec). Once in motion, debris velocity is virtually independent of particle size, but is clearly a function of water velocity. Relatively high velocities are needed to lift particles up from horizontal pipe surfaces and dirt pockets (dirt collection points at the base of riser pipes), and especially to overcome problems of particle retardation when moving from the horizontal through a vertically upward bend. Special provisions may need to be made to ensure the cleaning of dead-leg areas,... 

The 1970s saw the introduction of a very popular series of three television motion pictures, followed by a television series on the same theme The Six Million Dollar Man. The motion pictures and series starred Lee Majors as a test pilot whose airplane crashed, resulting in the loss of both legs, an arm, and an eye. Majors s character, Steve Austin, was rebuilt by a skilled physician named Dr. Rudy Wells using advanced biomedical body parts at a cost of 6 million (hence the name). In a follow-up series, Lindsay Wagner played Austin s counterpart, Jaime Sommers, in The Bionic Woman. Sommers was seriously injured in a parachute jump and, like Austin, is provided with a number of engineered body parts that give her extraordinary physical powers. 

Light-driven unidirectional molecular rotary motors based on photoisomerization around a C=C bond51 have been successfully immobilized on nanoparticle gold surfaces by two thiol-functionalized legs to yield an azimuthal rotary motor (compound 1 in Fig. 17.2).52 Repetitive and unidirectional 360-degree rotary motion of the rotor moiety with respect to the surface-immobilized stator part was observed to occur on... 

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