OBJECTIVES The aims of this study were to: 1) assess the feasibility of left ventricular (LV) vortex flow analysis using contrast echocardiography (CE); and 2) characterize and quantify LV vortex flow in normal subjects and patients with LV systolic dysfunction. BACKGROUND Vortices that form during LV filling have specific geometry and anatomical locations that are critical determinants of di...

BACKGROUND Qualitative and quantitative flow hemodynamic indexes have been shown to reflect right ventricular (RV) afterload and function in pulmonary hypertension (PH). We aimed to quantify flow hemodynamic formations in pulmonary arteries using 4-dimensional flow cardiac magnetic resonance imaging and the spatial velocity derivatives helicity and vorticity in a heterogeneous PH population. ...

RECEIVED : Shortened title : Acoustic probing of a vorticity eld. Abstract It is generally known that vorticity is characterized by rapid change and inter-mittency. However, this intermittency has generally been described in terms of probability density functions in a statistical framework. The present report introduces a new methodology which couples an advanced experimental design which utili...

Two aspects of vorticity associated with cold pools are addressed. First, tilting of horizontal vortex tubes by the updraft at a gust front has been proposed as a means of getting near-ground rotation and hence a tornado. Theory and a numerical simulation are used to show that this mechanism will not work because warm air parcels approaching the gust front decelerate in strong adverse pressure ...

We derive the conditions for the stability of strips or filaments of vorticity on the surface of a sphere. We find that the spherical results are surprisingly different from the planar ones, owing to the nature of the spherical geometry. Strips of vorticity on the surface of a sphere show a greater tendency to roll-up into vortices than do strips on a planar surface. The results are obtained by...

A large fraction of the rain received by continental India is produced by cyclonic vortices with outer radii of about 1,000 km that are contained within the larger scale South Asian monsoon flow. The more intense occurrences of these vortices are called monsoon depressions; these consist of bottom-heavy columns of relative vorticity that propagate to the northwest in time-mean low-level eastwar...

On 20–22 July 2012, a severe rainstorm occurred in the Sichuan basin of Southwest China and Beijing area North China. This was related to activities Tibetan Plateau vortex (TPV) (SWCV). By using radiosonde, satellite brightness temperature, NCEP_FNL data, we investigated helicity characteristics nearly vortexes their effect on convection. Results showed that (1) strong precipitation mainly inte...

Measurements made from the Dynamics Explorer-2 satellite in November 1981 through January 1982 and November 1982 through January 1983 have been analyzed to determine the divergence and vertical component of vorticity of the high-latitude n utral wind field in the upper thermosphere for quiet (Kp <3) and active (3+ < Kp <6) geomagnetic conditions and for both northern (winter) and southern (summ...

new structural, metamorphic, finite strain and kinematic vorticity data for granitic gneiss and metavolcano-sedimentary rocks of thetanumaharea in the arabian shield in saudi arabia reveal a history of deformation reflecting different tectonic regimes. kinematic analysis shows their relationship to the nappe contacts between the granitic gneiss and metavolcano-sedimentary rocks and explains the...