Well test analyses that include the first and second derivative of pressure plotted on a semilog scale can help detect radial flow. Plots of pressure data from short transient tests often fail to ...

👉 Learn how to find the derivative of exponential and logarithmic expressions. The derivative of a function, y = f(x), is the measure of the rate of change of the function, y, with respect to the ...

One of the alleged "green shoots" perking up the economy was that unemployment was getting worse more slowly. Economic and financial journalists have been calling this the "second derivative" argument ...