The flow field or multidimensional velocity distribution of the coolant in fuel rod bundles reactor core pressurized water reactors (PWRs) is an important parameter that revealed through experimental investigations. This paper presents two-dimensional (2D) profile measurement using a two-element ultrasonic transducer with both elements acting as transceiver. size minimized for compactness, lead...

. Vibro-acoustography (VA) is an acoustic image modality based on the response of tissue under excitation of two ultrasound beams with different-frequencies. The aim of this paper is to provide a quantitative analysis with experimental measurements of the difference-frequency (DF) pressure generated in VA. This analysis considered the radiation force , the induced acoustic emission, and nonline...

The genesis of gallop sounds was investigated in 12 patients by simultaneous measurement of external apexcardiographic (ACG) and left ventricular (LV) pressure, dP/dt, and sound using infinite time constant piezo-resistive pressure transducers with identical sensitivity and frequency responses. Absolute intensity of internal and external sound was quantified. The external transducer was applied...

In this paper we determine the ability to obtain values of the first normal stress difference, N1, at relative high shear rates (1.0–100.0 s−1) in slit-die for several polymer melts of varying degrees of fluid elasticity using hole pressure data and the Higashitani–Pritchard–Baird (PHB) quation. Accurate measurements of the hole pressure, Ph, which is defined as the difference between the press...

objective: for many years in herbal medicine the antihypertensive and lowering blood lipid properties of achillea wilhelmsii (a. wilhelmsii) have been suggested. in the present study the impacts of the plant extract on rabbit’s blood pressure and heart rate have been investigated. materials and methods: twelve nwz rabbits weighed 2-3 kg were randomly divided into two groups of 6 rabbits. the te...

objective(s) calcium-channel blockers have an important role in the treatment of several cardiovascular disorders. derivatives of 1, 4-dihydropyridine are one of the most potent calcium antagonists. in this study four novel ', 4-dihydropyridine calcium channel blockers were synthesized and their hypotensive properties were investigated in male rats. materials and methods four 1, 4-dihydrop...

Histotripsy is a therapy that focuses short-duration, high-amplitude pulses of ultrasound to incite a localized cavitation cloud that mechanically breaks down tissue. To investigate the mechanism of cloud formation, high-speed photography was used to observe clouds generated during single histotripsy pulses. Pulses of 5-20 cycles duration were applied to a transparent tissue phantom by a 1-MHz ...

Differential pressure transducers can be used to monitor the suspended-sediment concentration in a water column. Suspended sediments with densities greater than water increase the fluid density, which is determined by measuring the fluid pressure change between two depths. Lewis and Rasmussen (1999) used a densimetric technique under controlled conditions to determine suspended-sediment concent...