Abstract We present the new (for Mach numbers М = 3 and 3.5) generalizing from 2 to 4) results of experimental investigations on effect small angles attack laminar-turbulent transition in supersonic boundary layer a swept wing with leading-edge slip angle 72°. The angle-of-attack variation has strong Reynolds number. number decreases increase measurements were carried out by means constant-temp...

Background: This study assessed the application value of 64-slice spiral computed tomography angiography (CTA) in a follow-up evaluation of patients receiving coronary stent implantation. Materials and Methods: A total of 468 patients who underwent percutaneous coronary intervention (PCI) at our hospital between January 2013 and October 2016 were selected for this study. Coronary angiography an...

Samples from Cellulose triacetate (CTA) sheets were irradiated with electron beam in the dose range 10–200 kGy. Non-isothermal studies were carried out using thermogravimetric analysis (TGA) to obtain the activation energy of thermal decomposition for CTA polymer. The CTA samples decompose in one main break down stage. The results indicate that the irradiation by electron beam in the dose range...

The ability of a thermal anemometry system to accurately measure unsteady fluid velocity depends on the electrical control system as well as the thermal properties of the sensor. The present work is a numerical study of the thermal transient response of a hot-wire. A conventional constant temperature anemometer with an ideal feedback amplifier as well as a pulse width modulated system were used...

Sonic anemometers are capable of measuring the wind speed in all three dimensions at high frequencies (10–50 Hz), and are relied upon to estimate eddy-covariance-based fluxes of mass and energy over a wide variety of surfaces and ecosystems. In this study, wind-velocity measurement errors from a three-dimensional sonic anemometer with a nonorthogonal transducer orientation were estimated for ov...

Abstract Experimental results on laminar-to-turbulent transition in a separated laminar boundary layer formed over flat plate an adverse pressure gradient are provided. Experiments have been performed for range of Reynolds numbers (1.4 − 2.4 · 10 5 ) and two freestream turbulence levels ( Tu =3.6 5.3%). The measurements mean fluctuating velocity profiles carried out at inlet to the test section...

Realistic specifications of the roughness length and zero-plane displacement are crucial in the boundarylayer parametrisation that plays an important role in numerical mesoscale models (Abdella and Mcfarlane 1996). Martano (2000) proposed a method for estimating the surface roughness length (z0) and the displacement height (d) from single-level sonic anemometer data. This method reduces the pro...

springs are the  mechanical parts which have many application in industries. static and dynamic forces cause relaxation in these parts so that they lose some of their free length and reaction force. springs constant are very important in airplane and vailway industry since constant and variable forces are applied to them in period time, therefore it is necessary to avoid decreasing in spring co...

The parametrizations of meteorological variables provided by the Monin–Obukhov similarity theory (MOST) is major importance for pollutant dispersion assessment. However, complex flow pattern that characterizes urban areas limits applicability MOST. In this work, performance different existing standard deviation vertical wind velocity were tested in city Rome. Results compared with experimental ...