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Ask an expertMachine-Hour Capacity. The first step in understanding production capacity is to calculate the machine-hour capacity of the factory or manufacturing plant. For example, say that a plant has 50 machines and workers can use the machines from 6 a.m. Until 10 p.m., or for 16 hours a day. The daily plant capacity in hours is 16 hours multiplied by 50.
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Levels were taken to prepare cross sections for road construction. Levels were obtained at the road centreline, and at 20m left and right of the centreline. The following table shows the cross section reduced levels obtained at two locations 20 metres apart, at Chainage 320.00m and at Chainage 340.00m. Position 20m Left Centreline 20m Right Formation Design RL Ch. 320.00m RL 29.95 m RL 30.41 m RL 33.46 m RL 32.50 m Ch. 340.00m RL 30.28 m RL 31.42 m EL 31.57 m RL 33.00 m The design formation width is 10 metres, and the batter slopes are 1 vertical to 2 horizontal. The formation design RL for each chainage is shown in the table. a. Compute the cross-section area of fill at Chainage 320.00. b. Compute the cross-section area of fill at Chainage 340.00. c. Calculate the volume of fill required between these two cross-sections. Surveying road area calculation
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Analytical instruments are used to detect, quantify and qualify almost everything imaginable. Detection of energy or matter requires a baseline reading (no analyte) and a signal generated by the analyte of interest. Baselines are not perfectly flat-they have mild deviations known as 'noise.' Limits of detection generally require the analyte signal to be from three to 10 times greater than the 'noise' fluctuations.
- Any change in chemical or equipment parameters requires recalculation of baseline noise and limits of detection. Some machines require substantial warm-up time before they give an even baseline. Wait until conditions are stable before you figure your limits of detection.
- Researchers are often tempted to use the absolute limit of detection for the limit of quantification. It gives them more data and makes it seem as if they have a more sensitive protocol-but isn't good science. Be conservative and honest for more robust data and a more solid reputation.
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Establish a baseline. Run the analytical instrument in the absence of the analyte to determine the baseline value of the detector. Stable baselines should not drift up or down.
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Examine the baseline and determine an average value. Use the instrument's integration capability or draw a line through your best-guess at what the average value is between up and down noise. Note the value of the average on the readout scale (y-axis value).
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Determine the noise. Measure 10 peaks above the average value for your baseline. Add the values together and divide by 10. This is your average noise value. Note: Some instruments have 'system' peaks that are predictable and much higher (or lower) than baseline--if you can predict the system peak, it doesn't count in determining noise.
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Add a standard of known value. Introduce an energy of known value (a sound, light, or electrical input for energy analysis instruments) or a chemical quantity of known value. Start with a high concentration of the standard so you get a good peak in the readout. Note the value (concentration or strength) of the standard and the value of the peak height. Measure from the top of the peak to the baseline.
Determine absolute limit of detection. Reduce the concentration or intensity of the standard. Input a smaller signal or concentration until the analyte peak is about three times the height of your average noise peak. This intensity or concentration is the absolute limit of detection.
Determine the quantification limit of detection. Increase your input intensity or concentration to the point the peak height is 10 times the average noise peak. This is the lowest concentration for which you can reasonably state the concentration or intensity of the analyte.
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