Pulsed performance

Apart from the gradient itself, the degree of suppression is related to the efficiency of excitation by the selective pulse and thus the choice of selective pulse is important with, for example, hyperbolic secant pulses perform better than sine pulses." If the solvent Ti is very short and on the order of the time for the dephasing procedure, then some (unwanted) z-magnetization will be re-established prior to the excitation pulse. One method of circumventing this... 

Figure 3.7. Excitation trajectories as a function of resonance offset for (a) a 90° pulse and (b) a 180° pulse. The offset moves from zero (on-resonance) to - -yB Hz in steps of 0.2yB] (as in Fig. 3.6). The 90° pulse has a degree of offset-compensation as judged by its ability to generate transverse magnetisation over a wide frequency bandwidth. In contrast the 180° pulse performs rather poorly away from resonance, leaving the vector far from the target South Pole and with a considerable transverse component.

Figure 4. Pulse performed on concrete at different stages of loading.

NCPO.05-1 Medical compact, reliable, sterilized, good pulse performance... 

Model-based predictions of battery performance and longevity are required to provide depletion indicators for batteries such as RRT (recommended replacement time), typically based on discharge voltage or resistance, to allow patients to schedule a replacement surgery before batteries reach EOS (end of service). Electrical characteristics of primary batteries used in medical applications have been modeled in a variety of ways including empirically or thermodynamics-based voltage curve models [16,17], equivalent circuit models [18,19], resistance models [11,20], and more recently physics-based comprehensive models [17, 21-23] that can be used to predict pulse performance [24],... 

FIGURE 24.10 High-rate pulse performance at IOC discharge rate for VRLA cyUndrical units, (a) 25°C. (b) 20°C. The upper curves are pulsed, the lower curves... 

We should have gained an appreciation for the way in which the magnetic moments are snapped into new orientations in a rapid crisp manner in such a high field that the RF pulses perform sudden precise operations. Thus the various sine and cosine terms are also very precise even though they... 

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