In particular, when measuring time-frequency parameters, traditional methods require more time for measurement, if the frequency value has to be measured more accurately.
PSDs are plotted in pT/√Hz versus measurement time and frequency in Hz.
The work activities were examined using the following measurements: activity time, frequency, duration, and the switch between two consecutive activities.
That means that we should think about other strategies to increase role security and therapeutic commitment, find out the optimal measurement times and frequencies, and create long-term trials to monitor role security, therapeutic commitment and in the end screening and brief interventions against hazardous and harmful alcohol consumption.
The commonly used measurements are activity time, frequency, duration and the switch between two consecutive activities.
In a typical DOT system three measurement schemes are used for measurements: time domain, frequency domain, and continuous wave (cw).
A simple method is to average frequency over a number of cycles, in a time period referred to as frequency measurement time (FMT) by using a zero-crossing method.
This method requires a large measurement time especially for wide band frequency measurements; therefore such methods cannot guarantee reliable results in open area.
Under the constraint of total experimental cost, sample size, measurement times, and measurement frequency are obtained by minimizing the asymptotic variance of the estimated 100pth percentile of the product's lifetime distribution.
The measurement time was about 1 min using the surface resonance frequency, whereas measurements at 3 mm depth resulted in considerable longer acquisition times (about 5 min).
