Peak phase

So you see that refocusing of 13C is always complicated by the fact that the optimal refocusing time is different for a CH, CH2, or CH3 group. Of course, we can exploit these differences to get spectral editing (making peak phase—up, down, or missing—tells us about... 

These are common after myocardial infarction. Their particular significance is that the R-wave (ECG) of an ectopic beat, developing during the early or peak phases of the T-wave of a normal beat, may precipitate ventricular tachycardia or fibrillation (the R-on-T phenomenon). About 80% of patients with myocardial infarction who proceed to ventricular fibrillation have preceding ventricular premature beats. Lignocaine (lidocaine) is effective in suppression of ectopic ventricular beats but is not often used as its addition increases overall risk. 

Figure 3.16 shows that some expulsion does occur prior to the peak phase of oil generation. During this early expulsion stage the edges of thick source rock layers and the thin source rock layers are depleted (Leythaeuser et al., 1987). 

The hydrocarbons expelled from the mature source rocks in separate phase, may initially occur in a very finely dispersed state. At depths corresponding to the peak phase of hydrocarbon expulsion in actively filling and subsiding basins, the hydrodynamic condition is characterized by the intermediate or the deep subsystem of burial-induced groundwater flow. Initially, the very finely dispersed hydrocarbons will move along with the burial-induced groundwater... 

Fig. 20 to the same distribution for the fields produced in the second-harmonic generation process shown in Fig. 13. The differences are clearly visible. The distribution for the downconverted held from the beginning develops a two-peak phase structure, which is a consequence of the two-fold rotational symmetry of the Q function for the signal mode. It is known [57,67] that for fc-photon downconversion the Q function has fc-fold rotational symmetry and the phase distribution has k peaks, at least at the initial stages of the evolution. From Fig. 20 it is also clear that when the intensity of the signal mode reaches its...

Likewise, the reverse ROE-TOCSY steps would produce a similar signal, but the conclusion would be wrong in either case. Since TOCSY transfer retains signal phase, its involvement in crosspeak generation is not obvious and can lead to drastically incorrect conclusions. Furthermore, if TOCSY and ROE transfers occur simultaneously between two spins, the ROE peak may be reduced in magnitude or even cancelled owing to opposite peak phases. The various transfer pathways that may occur during ROESY are summarised in Table 8.5. 

PLA PEG 1000 365 RT 29.4 Tg increase, small enthalpic relaxation peak, phase separation 92... 

To use this table to determine the electrical component of the minimum approach distance, the employer must determine the peak phase-to-ground transient overvoltage and select a gap from the table that corresponds to that voltage as a withstand voltage rather than a critical sparkover voltage. To calculate the electrical component of the minimum approach distance for voltages between 5 and 72.5 kilovolts, use the following procedure ... 

Multiply the phase-to-ground voltage by the square root of 2 to convert the rms value of the voltage to the peak phase-to-ground voltage. 

The cardiac AP, illustrated in Fig. 1 for a ventricular myocyte, is conventionally composed of four phases. A rapid upstroke (phase 0) is followed by a brief peak (phase 1) followed by a sustained plateau (phase 2). A rapid repolarisation (phase 3) begins after several hundred milliseconds have elapsed and this is followed by... 

For Colombia, three distinct peaks of El attacks can be observed, i.e. 1991-1992 (medium peak), 1999-2002 (medium to high), and 2005-2007 (low-medium). It is worthwhile to note that annual attacks after the third peak generally remained at higher levels than before the first peak, indicating that the situation is still fragile. The first peak is predominantly attributable to the petroleum sector and attacks on the Cano Limon pipeline. The second peak phase was targeted towards transmission lines in the energy sector, and to a lesser extent this was also the case for the third peak. In Iraq,... 

TABLE 77.2 Peak Phase-Averaged Velocities and Turbulent Shear Stresses Measured within the Hinge Region of Different Bileaflet Valve Designs... 

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