Patients with primary orthostatic tremor (OT) experience a disabling sense of unsteadiness but rarely fall. In order to study the relationship between the development of subjective unsteadiness, objective unsteadiness and tremor, we recorded standing under four conditions (eyes open or closed, feet together or apart) in six patients with OT. Subjective unsteadiness was indicated by the patients...

A new method to measure shock wave unsteadiness is presented. Time-resolved visualizations of the flow field under investigation are obtained using a high-speed schlieren optical system and the motion of the shock wave is determined by means of digital image processing. Information on the shock's unsteadiness is subsequently derived with Fourier analysis. A sample study on shock unsteadiness in...

In vitro gliding assays, in which microtubules are observed to glide over surfaces coated with motor proteins, are important tools for studying the biophysics of motility. Gliding assays with axonemal dyneins have the unusual feature that the microtubules exhibit large variations in gliding speed despite measures taken to eliminate unsteadiness. Because axonemal dynein gliding assays are usuall...

Global-stability theory is used to predict the onset of flow unsteadiness based on steady solutions of the Reynolds Averaged Navier–Stokes equations. The stability problem is formulated for compressible flow at moderately-high Reynolds numbers, using a turbulence model to provide closure for the averaged Reynolds stresses. The approach provides an efficient method for predicting the occurrence ...

The effect of spatial inhomogeneity sea waves on the accuracy determining level surface is studied. Based data direct wave measurements, variability statistical characteristics scales smaller than size area illuminated by radar was analyzed. case considered when radio sounding carried out at low angles incidence located a spacecraft. It shown that displacement distribution median elevations, wh...

Hypersonic leading-edge separation is studied toward understanding the varying shock-related unsteadiness with freestream Reynolds number ( $$1.66 \times 10^5 \le \text{Re}_D 5.85 10^5$$ ) in newly constructed hypersonic Ludwieg tunnel (HLT) at a design Mach of $$M_\infty =6.0$$ . An axisymmetric flat-face cylinder base body diameter $$D=35$$ mm fitted axial protrusions different fineness $$d/D...