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All-sky view of the 1998 Leonids shower. 156 meteors were captured in this 4-hour image.. In astronomy, the zenithal hourly rate (ZHR) of a meteor shower is the number of meteors a single observer would see in an hour of peak activity if the radiant was at the zenith, assuming the seeing conditions are perfect [1] (when and where stars with apparent magnitudes up to 6.5 are visible to the ...
Gas blending is the process of mixing gases for a specific purpose where the composition of the resulting mixture is defined, and therefore, controlled. A wide range of applications include scientific and industrial processes, food production and storage and breathing gases.
This is related to an activity rate which is a similar calculation used in activity-based costing. A pre-determined overhead rate is normally the term when using a single, plant-wide base to calculate and apply overhead. Overhead is then applied by multiplying the pre-determined overhead rate by the actual driver units. Any difference between ...
The hazard ratio is the effect on this hazard rate of a difference, such as group membership (for example, treatment or control, male or female), as estimated by regression models that treat the logarithm of the HR as a function of a baseline hazard () and a linear combination of explanatory variables:
Short rate models are often classified as endogenous and exogenous. Endogenous short rate models are short rate models where the term structure of interest rates, or of zero-coupon bond prices (,), is an output of the model, so it is "inside the model" (endogenous) and is determined by the model parameters. Exogenous short rate models are ...
The equation for head loss in pipes, also referred to as slope, S, expressed in "feet per foot of length" vs. in 'psi per foot of length' as described above, with the inside pipe diameter, d, being entered in feet vs. inches, and the flow rate, Q, being entered in cubic feet per second, cfs, vs. gallons per minute, gpm, appears very similar.
Overtime rate is a calculation of hours worked by a worker that exceed those hours defined for a standard workweek. This rate can have different meanings in different countries and jurisdictions, depending on how that jurisdiction's labor law defines overtime. In many jurisdictions, additional pay is mandated for certain classes of workers when ...
Blended value propositions are founded on the notion that value cannot be bifurcated, and is inherently made up of more than one measurement of performance. For example, under a blended value proposition, a for-profit business would consider their social and environmental impact on society alongside their financial performance measurement.