Regularity analysis

Total acid number (TAN) is a measure of the amount of acid or acid-like material in the oil sample. Because new oils contain additives that affect the TAN number, it is important to compare used oil samples with new, unused, oil of the same type. Regular analysis at specific intervals is important to this evaluation. 

Most matrix reference materials are regarded stable for their application within a certain time frame see also Section 2.2. They are usually produced in large batches designed to ensure that the same material is available for a number of years as well as to spread the high cost of production over as many units as is possible. The stability is closely monitored from initial production by the producer lot numbers or even individual unit numbers are allocated and the producers closely monitor, by regular analysis, the condition and quality of their reference materials over time. Because of such careful control, and to minimize waste, the tendency has been for producers to give a usable life from receipt to the customer, commonly 12-24 months. However, the producers can give this shelf life expectancy only for unopened units. 

One way to use a CuSum chart to understand such changes is to plot a regular analysis of a reference material (which does not have to be a certified reference material, rather a material which is the same and stable over time) and note any obvious changes to the system on the chart. The quality assurance manager can then evaluate any effects due to the changes and take... 

To determine the total moisture, either an analysis sample can be prepared from the moisture sample, or the regular analysis sample can be used for this purpose, provided that the moisture analysis is performed on the analysis sample within a prescribed time after the air-dry sample is prepared. When separate analysis samples are used for moisture and for the other determinations that are... 

Storage blanks (40 mL vials with analyte-free water) are placed in cold storage with samples for VOC analysis. Regular analysis of storage blanks enables laboratories to detect whether sample cross-contamination may have taken place in cold storage. 

Because many heavy metals are toxic to man, animals and plants, it is necessary to monitor continually potable water, river water and trade and sewage effluents to check that the metal levels are below the predefined safe limits. In this way, water quality is preserved and the health of the population is safeguarded. It is because of the public health aspects that toxic limits for metals in surface waters have been introduced and those set by the European Economic Community are displayed in Table 1. It can be seen that all limits are at the trace level and in order to comply with these directives there will be a need for the regular analysis of raw and potable waters for these metals. This is the function of quality-control water laboratories. 

The identification of chemical finishes on fabrics can serve several purposes. Often a fabric with an unknown finish needs to be analyzed for forensic or competitive reasons. Fabrics that do not perform as expected need to be analyzed to determine if the correct finish was applied in the proper concentration. Regular analysis of production fabrics forms a basis for process improvement through application of statistical process control methods. 

Banks, M.I. and M.B. Sachs (1991). Regularity analysis in a compartmental model of chopper units in the anteroventral cochlear nucleus. /. Neurophysiol. 65,606-629. 

Once control methods have been established their performance should be monitored. For example, the performance of the ventilation system should be monitored by regular analysis of the plant atmosphere. Personal proteetive equipment should be inspected regularly to ensure it is in good condition and being properly used. 

In the regular analysis and reinforcement of the ring beam, the beam is simplified to a multilinear beam for modeling. The required assumptions are ... 

Ngan, H. Y. T. Pang, G. K. H. 2009. Regularity analysis for patterned texture inspection. IEEE Transactions on Automation Science and Engineering 6(1), 131-144. 

Regular analysis and reporting of burden of disease and injury and... 

Reference materials with certified At and Ct values are now available from Scripps Institution of Oceanography. These materials are prepared from sterilized natural seawater, and are certified by titration against coulometrically standardized acid (At) and by manometric measurement of the CO2 released on acidification (Ct)- Regular analysis of these certified reference materials allows the analyst to check for bias and drift in the analytical technique. The use of certified reference materials in At and Ct analysis is discussed in detail in DOE (1994). 

The regularity analysis of the membrane is done in the perpendicular direction of the flux. For example, in case of a fluid flowing vertically (from top to bottom of the image), the analysis would be done horizontally, scanning the differences of pore distribution along the horizontal. The membrane should be regular in this sense because (independent of flux direction) the pore distribution should be the same. The results are expressed in terms of covariance and, in order to make the results comparative, the covariance is always calculated as normalized values (0-1). The covariance is calculated using Equation (3.2) [39] ... 

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