In the field of physics, the term velocity refers to the rate at which an object changes its position, taking into account both the speed and direction. While average velocity is relatively ...

When a fluid is in motion, it must move in such a way that mass is conserved. To see how mass conservation places restrictions on the velocity field, consider the steady flow of fluid through a duct ...

Abstract: It is very important, but difficult to measure instantaneous flow rate in the unsteady flow regime, since the variation of velocity profile limits the dynamic accuracy of flowmeters.

Abstract: GNSS has become a widely accessible technique for vehicle instantaneous velocimetry. GNSS time difference carrier phase (TDCP) velocimetry can provide high-accuracy displacement increments, ...

Figure 1: Schematic characteristic timescales of Brownian motion in different regimes. Figure 2: Schematic of the experimental set-up and upconversion luminescence measurements of the NaYF ...

Instantaneous velocity refers to the rate at which an object changes its position at any given moment. It is essentially the speed and direction of an object at a specific point in time. Calculating ...