Determination of Blood Vessel Parameters by Pulse Wave

A pulse wave is a complex joint motion of blood and vessel walls described by a nonlinear system of differential equations of hydrodynamics and elasticity theory with a mobile boundary. Even an approximate solution to such a problem is currently not possible without significant simplifications, reducing the problem to almost uninteresting cases. Therefore, to mathematically describe the practically important changes in the pulse wave between the norm and pathology and to identify the main physical parameters that characterize the pathology, it is necessary to build a phenomenological model, the parameters of which are determined from comparison with the experiment.The results obtained indicate that the pulse wave transformation in the cuff area is significantly nonlinear in pressure. Attention is also drawn to the effect of a decrease in the elastic modulus with an increase in the diameter of the vessel.

Application of a new scale-aware three-dimensional subgrid mixing parameterization on the simulations of tropical cyclone

<p>A new scale-adaptive three-dimensional (3D) turbulent kinetic energy (TKE) subgrid mixing scheme is developed using the Advanced Research version of the Weather Research and Forecasting Model (WRF-ARW) to address the gray-zone problem in the parameterization of subgrid turbulent mixing. This scheme is based on the full 3D TKE prognostic equation and combines the horizontal and vertical subgrid turbulent mixing into a single energetically consistent framework.</p><p>A series of real tropical cyclone(TC) simulations with varying horizontal resolutions from 9km to 1km are carried out to compare the performance of the 3D mixing scheme and the conventional 1D planetary boundary layer (PBL) schemes to the observations, including conventional ones such as radiosonde and surface synoptic observations, as well as intensive ones obtained during the landfall of TC, such as mobile boundary layer wind profiler and Dual-pol Doppler Radar. This study aims to determine if the new scheme performs appropriate on TC simulation, and to evaluate the sensitivity of TC simulation to boundary layer schemes.</p>

From Frozen Conflict to Mobile Boundary: Youth Perceptions of Territoriality in War-Time Ukraine

Scholarly and media sources have often described the conflict in Ukraine’s east as a potential “frozen conflict” similar to other such conflicts in the post-Soviet space. My interviews with young Ukrainian citizens reveal that many imagine not a stalemate but rather a continuous repositioning of the border between Ukraine and Russia. I use the term “mobile boundary” to describe the widespread belief within my sample that the Ukraine-Russia boundary may move back and forth within Ukrainian territory. Some interviewees express their willingness, at least in theory, to surrender the contested territories of Donetsk and Luhansk, but it is their fear of Russian encroachment beyond those territories that provides the rationalization for continued military defense of the Donbas.