Phase lag correction

Has the phase lag correction been applied when calculating the reversing... 

Comments on Methods of Phase Lag Correction In much of the practical section on MTDSC it is assumed that the calorimeter behaves ideally. In other words, the sample and sensor can respond instantaneously and there are no significant thermal lags in any part of the system including the sample. In reality, this is clearly not true and there is a... 

The simplest approach, and one that in practice is often justified, is to not carry out the phase lag correction and make the approximation as has already been mentioned above, i.e. C = CpR. In many practical cases, knowing CpK or C (= CpK/6) is not of any value. Thus, it can simply be neglected. 

Use of the phase lag correction depends on the user s analysis needs. However, the effect of the correction is not significant unless it is applied to the melting transition. 

From Equation (17-4), one will find that the phase lag is a function of the relative rotating speed lu/lu and the damping factor (See Figure 17-1.) The force direction is not the same as the maximum amplitude. Thus, for maximum benefit, the correction weight must be applied opposite to the force direction. 

With MATLAB, what you find is that the actual curves are very smooth it is quite different from hand sketching. Nevertheless, understanding the asymptotic features is important to help us check if the results are correct. This is particularly easy (and important) with the phase lag curve. 

Figure 12.2c shows the temporal variation of the instantaneous frequencies for the two modes. It is interesting to observe how the frequency of the fast mode is modulated in a fairly regular manner. With about 17 modulation cycles for fjast during the 500 s of observation time, we conclude that the frequency of the fast mode is modulated by the presence of the slow mode, indicating that the two modes interact with one another. If one compares the phase of the tubular pressure variations in Fig. 12.2a with the phase of the frequency modulation in Fig. 12.2c it appears that the maximum of ffast occurs about 60° after the maximum of Pt. It is important to note, however, that the various steps of our wavelet analysis may have introduced a certain phase lag. We are presently trying to correct for such effects in order to obtain a better understanding of the instantaneous relation between the two variables. 

If a furnace has one or more bottom zones, use the same thinking to do the temperature profiles. Before the next phase, check to see if any of the following need reconsideration (1) Is the exposure factor still applicable (2) Is the time-lag correct (3) Is the time in the furnace still correct ... 

A quantitative interpretation of results in the melt region, with or without the use of the phase lag, is often problematic. As a consequence of this, it often does not matter whether the phase correction has been applied or not... 

What type of baseline correction has been applied to the phase lag signal ... 

We note here that there is an error in the formula given in ref. 33 which we have corrected here. In order to have phase-lag of order 22, dissipation order 10 and algebraic order eight Tsitouras has chosen the set of parameters given by Table 2. In order to have phase-lag of order 18, dissipation order 14 and algebraic order eight Tsitouras has chosen the set of parameters given by Table 3. 

Johnson and Borisy first showed that the lag phase in the plot of turbidity (i.e., polymer weight concentration) versus time accounted for only 5—10% of the entire amplitude obtained upon completion of the polymerization process. By fitting the elongation phase to a single exponential process, these investigators arrived at the correct conclusion that microtubule number concentration becomes relatively stable within the first minutes... 

It is also possible to use an internal standard to correct for sample transport effects, instrumental drift and short-term noise, if a simultaneous multi-element detector is used. Simultaneous detection is necessary because the analyte and internal standard signals must be in-phase for effective correction. If a sequential instrument is used there will be a time lag between acquisition of the analyte signal and the internal standard signal, during which time short-term fluctuations in the signals will render the correction inaccurate, and could even lead to a degradation in precision. The element used as the internal standard should have similar chemical behaviour as the analyte of interest and the emission line should have similar excitation energy and should be the same species, i.e. ion or atom line, as the analyte emission line. 

The j values did not change significantly because of the short lag phase and use of the corrected zero time. (2) Theyj, values were nearly the same except for the simulations atf 7 131°C and can size211 x400. (3)Thexbh values could be separated into two distinct groups one for simulations at RTs 101 and and the other for... 

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