Abstract: We present a novel solution to the problems caused by the current single-frequency phase difference method’s constrained measurement range and the low measurement accuracy in ultrasonic wind ...
Abstract: The unconditionally stable (US) Chebyshev (CS) finite-difference time-domain (FDTD) method is extended for solving the problems of long-time simulation or harmonic resonance using a ...
Background Difference-in-differences is a method commonly used in population health research. It is based on assumptions that are well-known and well-understood in the classic textbook example of two ...
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