Difference tests, value

The insulation resistance thus measured at different intervals during the process of heating up will represent the insulation resistance of the windings at that temperature. Before plotting the curves, these test values must be collected to one reference temperature, say, 40°C, to maintain coherence in the test results. 

For LT units 2% of its capacitance value For HT units The two test values should be corrected to the same reference of dielectric temperature, say, 20°C or as agreed. The difference between tbe two test values should be less than an amount corresponding to either breakdown of an element or operation of an internal fuse. 

EN 779 1993 in principle contains two different test methods. The filter is tested both with untreated outdoor air and with the addition of synthetic dust. In the first case, the filter s dust spot efficiency is determined, i.e., its capacity to clean normal outdoor air. In the second case, the filter s arrestance is measured, i.e., its capacity to separate synthetic dust. The average value for dust spot efficiency or arrestance during the course of the test is used for classification of the filter. 

The chromatogram of the test sample for plate number determination normally is not a Gaussian-shaped peak, which means that all three equations result in different N values. Therefore, it is important to specify which method is used for the calculation of plate number. If the method used deviates from the normal practice, it must be justified. This is especially true for a column manufacturer. 

An apparatus for testing enamel with acid and alkaline liquids (and their vapours) was later proposed in an attempt to standardise corrosion ratings on an international basis. After surveying enamel properties and their relationship with resistance to liquids of different pH values, the concept of modifying the resistance by including specific elements in the glass structure has been outlined. ... 

A less accurate but more colorful way to measure pH uses a universal indicator, which is a mixture of acid-base indicators that shows changes in color at different pH values (Figure 13.5, p. 359). A similar principle is used with pH paper. Strips of this paper are coated with a mixture of pH-sensitive dyes these strips are widely used to test the pH of biological fluids,... 

In this test for transparent plastics, the loss of optical effects is measured when a specimen is exposed to the action of a special abrading wheel. In one type of test the amount of material lost by a specimen is determined when the specimen is exposed to falling abrasive particles or to the action of an abrasive belt. In another test, the loss of gloss due to the dropping of loose abrasive on the specimen is measured. The results produced by the different tests may be of value for research and development work when it is desired to improve a material with respect to one of the test methods. The variables that enter into tests of this type are... 

FIGURE 26.20 The log a v speed function of the previous chart is combined with the friction master curves for a natural rubber (NR) and a styrene-butadiene rubber (SBR) gum compound on glass showing the limited range of friction values (and their position on the log a-iv axis for different testing conditions) which are obtained when the sliding speed is increased. 

On many occasions the file has provided Information about effects of drugs of which the user was previously unaware. Undoubtedly this has helped the care of some patients. We are aware of several cases In which prolonged workups of unusual test values were avoided because of the simple explanations provided by the file. We expect to expand the application of the file by Introducing It In a revised form Into several hospitals for online Interpretation of data. Also, discussions have been held with several different Institutions overseas to set up national centers for dissemination of Information and to provide a better monitoring of foreign language publications to augment the content of the file. 

The total activity of the enzymatic mixture was determined from the percentage reduction of viscosity [12] during the depolymerization of solutions, buffered at different pH values, containing 1 % (w/v) of the polygalacturonic acid or 0.5% (w/v) of pectin. A Cannon-Fenske viscosimeter, (ASTM series n° 150) kept at the constant temperature of 25 °C, was used to carry out the tests. 

Ideally, the design team is responsible for making concurrent analyses of the actual test data as the data become available The team s understanding of the anticipated relations can be established by requiring the team scientists to make real time predictions of two kinds during the course of the experiment One kind occurs within a test condition In this case the data obtained to date from a particular test condition are used to predict the measurement values to be expected at a specified future date, say a week or month later for the same test condition A second kind of prediction involves across test conditions In this case the data obtained at one test condition are used to predict the measurement values for a different test condition at future specified dates ... 

Correlations Among the Different Test Methods. Comparative studies revealed that the test results from different apparatus are not highly correlated, and often the effectiveness rank is not correlated [594]. The effect of the settling time and oil/water ratio are important in determining the final effectiveness value. Energy is important only to the extent that, when high energy is applied... 

The disadvantage of both tests is that the user obtains only a small set of test data compared to the certification measurements that lead to the certified value and its uncertainty. But this is a fact of life in the world of the routine, rather than research, laboratory. Therefore the user of the data is always forced to compare differently obtained values and uncertainties. 

The Cochran-Mantel-Haenszel (CMH) test contains three different tests for association. The following table describes each test and shows where the / -value can be found in your pvalue data set. 

In clinical trial analyses you may want to test the mean for a single population to determine if that value differs from a hypothesized value. For example, let s say that you have the lab test value LDL and you want to know if the change-from-baseline value is significantly different from zero. There are several ways to perform this test in SAS. If you assume the change from baseline for LDL, ldl change, is normally distributed, you can run a one-sample t-test in SAS like this ... 

Other methods of determining the hardness of a material include a variety of "penetration" tests that yield hardness values measured in scales known as the Brinell, Rockwell (B or C), and scleroscope scales. These scales provide reliable hardness values for most materials, including ceramics, glass, metals and alloys, and wood (see Table 21). Unfortunately, as can be seen in the table, the various tests provide somewhat different hardness values for the same materials. 

As a quantification of the amount of nonlinearity, we see that when we compare the values of the nonlinearity measure between Tables 67-1 and 67-3, they differ. This indicates that the test is sensitive to the distribution of the data. Furthermore, the disparity increases as the amount of curvature increases. Thus this test, as it stands, is not completely satisfactory since the test value does not depend solely on the amount of nonlinearity, but also on the data distribution. 

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