PURPOSE Spontaneous venous pulsation is one of the clinical signs with which to rule out elevated intracranial pressure and papilledema. More subtle pulsatile retinal movements are difficult to observe because of eye movements. Recording a fundus movie and aligning (registering) the images helps, but the images still contain distracting microsaccadic distortions and noise. The authors hypothesi...

In this study, in order to increase the heat transfer rate in concentric double-pipe heat exchangers by an active method, a rotating ball valve was mounted downstream of the outer pipe end and used as a pulse generator. In the experimental set-up, hot water (40-70 °C) was passed through the inner pipe with fixed mass flow rate (Reynolds number ≈ 10,200) while cold water was passed through the a...

the linear adiabatic pulsation-periods of mira variable stars have been derived. approximately 2701[1]models were calculated for m = 0.7 mθ to 2 mθ stars with radii from 180 rθ to 340 rθ and luminosities from 2800 lθ to 10,000 lθ. the chemical composition of all models is (x,z) = (0.7,0.02). from the result of this study, linear relations on luminosity-period-mass relationship and luminosity-pe...

We reexamine the RRd mass determination using both new and previously existing linear pulsation models. Our conclusion is that the weight of evidence remains strongly with the" canonical" values (0.55 M (:) for Oosterhoff I clusters and 0.65 M 0 for Oosterhoff II clusters), unless the Population II metal opacities turn out to be very high. Subject headings: stars: interiors stars: pulsation sta...

To what extent can pulsational instabilities resolve the mass-loss problem of massive stars? How important is pulsation in structuring and modulating the winds of these stars? What role does pulsation play in redistributing angular momentum in massive stars? Although I cannot offer answers to these questions, I hope at the very least to explain how they come to be asked.

A clearance gap (CG) between guide vanes (GVs) and facing plates exists at both ends of a Francis turbine allows the opening angle to be adjusted for varying operating conditions. Leakage flow is induced through this due pressure difference two sides vanes. While some research works have used qualitative approaches visualize predict strength leakage vortex (LV), paper presents method quantifyin...

Introduction Diffusion weighted (DW) imaging is highly sensitive for bulk motion, which frequently occurs in vivo, such as in the lower brain areas, where the parenchyma pulsates rhythmically due to cardiac activity. It is known that for partial-Fourier (PF) imaging, the emergence of pulsation artefacts in DW images depends critically on the image reconstruction method. Specifically, it has bee...

In view of the recent investigations on the effect of temperature changes on biological processes (Crozier, 1924-25, a, b; Crozier and Federighi, 1924-25; Crozier and Sfier, 1924-25, a, b; Glaser, 1924-25) it became of interest to reexamine the relation between temperature and the rate of pulsation of the contractile vacuole of Paramecium. Kanitz (1907) found in four different species of Infuso...

BACKGROUND Radial artery wall might be damaged after cannulation for cardiac catheterization. We investigated structural changes of the radial artery wall after catheterization to understand whether these might predict radial pulsation loss or occlusion and local pain or functional impairment of the upper extremity. METHODS AND RESULTS Ninety patients underwent transradial coronary angiograph...

OBJECT Analysis of waveform data in previous studies suggests that the pulsatile movement of CSF may play a role in attenuating strong arterial pulsations entering the cranium, and its effectiveness in attenuating these pulsations may be altered by changes in intracranial pressure (ICP). These findings were obtained in studies performed in canines with normal anatomy of the CSF spaces. How then...