Frequency plots

Figure 4.5 Cumulative frequency plot and determination of mean and standard deviation graphically...

Figure 9-10. Map of response frequencies plotted against bearing stiffness.

Method III is called a "Histogram Plot" while Methods I n are called "Frequency Plot" and "Cumulative Frequency Plot", respectively. There is one important point which needs to be emphasized. That is ... 

If we were using the frequency plot method to present this data, we would think that the curve was just assymmetiical and that the distribution was not log-normal. Yet, it is obvious from 5.8.3. that it is log-normal. 

Figure 18. Phase angle vs. frequency plots from mild steel at different immersion times in (a) natural oiffield-produced water and (b) the same water with added SRB nutrients. (Reprinted from Ref. 36 with permission from NACE International.)...

A typical testing procedure involves several steps. First, the selected number and size of sieves are stacked upon one another, with the largest openings (inversely related to mesh per inch) being at the top of the stack, and beneath that a pan to collect the particles finer than the smallest sieve. The known amount of powder to be analyzed is then placed on the top sieve and the set is vibrated in a mechanical device for a predetermined time period. The results are obtained by weighing the amount of material retained on each sieve and on the collecting pan. The suction method uses one sieve at a time and examines the amount retained on the screen. In both methods the data are expressed as frequency or cumulative frequency plots, respectively. 

Nyquist plot Bode plot Nyquist plot is a frequency parametric plot of the magnitude and the argument of the open-loop transfer function in polar coordinates. Bode plot is magnitude vs. frequency and phase angle vs. frequency plotted individually. 

Fig. 10.3. Example of attenuation-frequency plot of electromagnetic interference filters as a function of...

These ten results represent a sample from a much larger population of data as, in theory, the analyst could have made measurements on many more samples taken from the tub of low-fat spread. Owing to the presence of random errors (see Section 6.3.3), there will always be differences between the results from replicate measurements. To get a clearer picture of how the results from replicate measurements are distributed, it is useful to plot the data. Figure 6.1 shows a frequency plot or histogram of the data. The horizontal axis is divided into bins , each representing a range of results, while the vertical axis shows the frequency with which results occur in each of the ranges (bins). 

Figure 6.1 Frequency plot (histogram) of the data shown in Table 6.1.

Figure 6.2 shows a frequency plot for a much larger sample of data (1000 data points) which was simulated from the data set shown in Table 6.1, using a computer program. 

Frequency factor, 14 278 Frequency plots, in particle size measurement, 18 137 Frequency-shift flowmeters, 11 673 Frescolat MGA, 24 525 Frescolat ML, 24 525 Freshening, of silicone rubber, 22 580 Fresh food products, packaging of,... 

As AD is made smaller, a histogram becomes a frequency distribution curve (Fig. 4.1) that may be used to characterize droplet size distribution if samples are sufficiently large. In addition to the frequency plot, a cumulative distribution plot has also been used to represent droplet size distribution. In this graphical representation (Fig. 4.2), a percentage of the total number, total surface area, total volume, or total mass of droplets below a given size is plotted vs. droplet size. Therefore, it is essentially a plot of the integral of the frequency curve. 

Figure 3.5 Relationship of response frequency plot to response surface.

Figure 21.1 Cumulative frequency plot illustration 25th, 75th percentiles, and the interquartile range. estimate of the population variance. Population means and variances are by convention denoted by the Greek letters p and o2, respectively, while the corresponding sample parameters are denoted by X and s2.

Fig. 7—Cumulative frequency plot of nifedipine-Eudragit microspheres as a function of methylene chloride solution viscosity.

Fig. 9—Cumulative frequency plot of nifedipine-Eudragit microspheres as a function of the initial nifedipine concentration. Microspheres were prepared using 1 1 of 0.8% PVA and 25 g of Eudragit RS RL mixture (1 1) in 80 ml of methylene chloride stirred at 400 rev/min.

Fig. 7.66. Simulated imaginary-impedance-frequency plot. (Reprinted from K. Chan-drasekaran and J. O M. Bockris, Electrochim. Acta 32 1398, copyright 1987, Fig. 10, with permission from Elsevier Science.)...

The average pore radius of a catalyst particle is the average of the dominant pore radii as observed from the frequency plot of the catalyst. 

Frequency plots of the 001/002 ratio of 249 Paleozoic shale (Weaver,1965) and 149 soil illites (White, 1962) indicate that well-ordered 10A 2M illites have a K20 content on the order of 9—10%. Mehra and Jackson (1959) have presented data which suggest that the completely contracted illite layers in illites have 10% K20. It seems likely that well-organized 10A illite layers contain 9—10% K20 and values less than this indicate the presence of non-illite layers or interlayer cations other than potassium. 

The ideality in surfactant-surfactant interactions found in the cmc plots is reflected in the composite v, CH2 band frequencies plotted in Figure 14. The solid... 

The mixing performance-frequency plot does not resemble the diaphragm displacement-frequency characteristics of the PZT piezoelectric ceramic [22]. 

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