Recent studies of rat mesenteric arteries using a wire myograph detected decreased Ca2+ and acetylcholine-induced relaxation responses. Preliminary experiments indicated the reduced responses were associated with the tungsten wire used in the myograph system. Compared with earlier observations, arteries mounted on aged 28-microm tungsten wire showed decreased maximal Ca2+-induced relaxation res...

In this paper the feasibility of fabricating controlled porous skeleton of pure tungsten at low temperature by addition of submicron particles to tungsten powder (surface activated sintering) has been studied and the best parameters for subsequent infiltration of Cu were acquired. The effects of addition of submicron particles and sintering temperature on porous as well as infiltrated samples w...

Aim: The aim of this study is to find an optimum material to protect garment for protection against 99Tcm radionuclide.Materials and Methods: Monte Carlo simulation code was applied to investigate radiation attenuation of 13 shielding materials including: Ba, gray Sn, white Sn, Sb, Bi, Bi2O3, BaSO4, Sn/W, Sb/W, Pb and W with thicknesses of 0.5 and 1 mm to determine an optimum protective garment...

Field Ion Microscopy (FIM) and Scanning Tunneling Microscopy (STM) have found a wide application in nanotechnology. These microscopes use a metallic nanotip for image acquisition. Resolution of FIM and STM images depends largely on the radius of nanotip apex; the smaller the radius the higher the resolution. In this research, for tungsten nanotip fabrication, electrochemical etching of tungsten...

Significant direct and scatter radiation doses to patient and physician may result from routine interventional radiology practice. A lead-free disposable tungsten antimony shielding pad was tested in phantom patients during simulated diagnostic angiography procedures. Although the exact risk of low doses of ionizing radiation is unknown, dramatic dose reductions can be seen with routine use of ...

This contribution presents numerical simulations of two recent High Energy Density (HED) physics experiments carried out at the GSI HHT experimental area using the SIS18 uranium beam. In one experiment, a solid lead target has been used while in the other case, a solid tungsten target has been considered. Our simulations show that with the existing beam parameters, one can achieve critical temp...

these Newsletters as he is the Technical Consultant to ITIA and has contributed no less than 11 articles, beginning in 2003. This time, together with his colleague Matthias Weil of the Vienna University of Technology, he has been prompted by the spectacular colours of tungsten oxides to delve deeper into the science behind the phenomena. Tungsten trioxide (WO3) as a fine yellow powder (right) a...

Friction stir welding and tungsten inert gas welding techniques were employed to weld armor grade aluminum alloy to investigate the effect of welding processes on tensile behavior of weld joints. Tensile tests, Vicker microhardness tests and optical microscopy were performed on developed weld joints and base metal. Welding process influenced tensile behavior and microstructure of weld joints. F...

The decrease in particle size may offer new properties to drugs. In this study, we investigated the size reduction influence of the acetaminophen (C(8)H(9)O(2)N) particles by mechanical activation using a dry ball mill. The activated samples with the average size of 1 microm were then investigated in different time periods with the infrared (IR), inductively coupled plasma (ICP), atomic force m...