Unsteady State Denudation

Fluvial Landscape Response Time: How Plausible Is Steady-state Denudation?

Whether or not steady-state topography and denudation are probable states depends on the timescale of system response to tectonic and climatic perturbations relative to the frequency of those perturbations. This paper presents analytical derivations of algebraic relations for the response time of detachment-limited fluvial bedrock channel systems both to tectonic and climatic perturbations. Det...

Unsteady-State Modeling of the Fluidized Bed Polyethylene Reactor

Unsteady-State Behavior of Naturally Fractured Reservoirs

A simplified model was employed to develop mathematically equations that describe the unsteadystate behavior of naturally fractured reservoirs, The analysis resulted in an equation of flow of radial symmetry whose solution, for the infinite case, is identical in form and function to that describing the unsteady-state behavior of homogeneous reservoirs. Accepting the assumed model, for all pract...

Unsteady-State Aerodynamic Performance of MEMS Wings

The unsteady-state aerodynamic performance results of various MEMS-fabricated titanium-alloy wing designs are presented. These wing are tested in a high-quality low-speed wind tunnel with velocity uniformity of 0.5%.. For the first time, we have identified the importance of spanwise stiffness effect in generating the leading edge vortices. These vortices, generated around each wing, cause a low...

State-space representation of the unsteady aerodynamics of flapping flight

State-space representation of the unsteady aerodynamics of flapping flight" (2014). ARTICLE INFO ABSTRACT Article history: A state-space formulation for the aerodynamics of flapping flight is presented. The Duhamel's principle, applied in linear unsteady flows, is extended to non-conventional lift curves to capture the LEV contribution. The aspect ratio effects on the empirical formulae used to...