Performance and reliability of medical X-ray sources for imaging humans are crucial from ethical, clinical and economic perspectives. This overview will treat the aspects to consider for investment of equipment for medical X-ray imaging. Recent X-ray tubes deliver enhanced reliability and unprecedented performance. But, metric for benchmarking has to change. Modern terms for product comparison ...

INTRODUCTION Tip cells are specialized endothelial cells that lead the migration of sprouting vessels and mediate anastomosis formation during vascular development in vertebrates (Geudens and Gerhardt, 2011; Herwig et al., 2011). Signaling through Vascular endothelial growth factor receptor (VEGFR), a receptor tyrosine kinase (RTK), is involved in selecting tip cells and in guiding their direct...

The technological process for manufacturing seamless steel tubes in the Sisak Rolling Mill includes the heating of the charge for processing in the hearth-rotating furnace. Description of the furnace and its operation can be found in literature 1 . In the process currently applied for producing the tubes with the outer diameter of 168.3–356.6 mm the temperature is between 1280 and 1300 °C 2 . T...

in order to evaluate the effectiveness of the iranian made charcoal tubes in the field , 60 local made and 60 imported ones (skc type) were randomly selected and placed side by side for sampling aromatic hydrocarbons (including benzene, toluene, xylene) in workers breathing zone in a paint factory. the results indicated that there were no statistically significant differences between the mean c...

ultraviolet waves, because of their short wavelength, have a high energy and considerable damaging effects on surfaces. protection against ultraviolet radiations is one of the finishing treatments done on surfaces exposed to sunlight. the importance of this issue in relation to human health, due to complications such as skin burns and cancer, is doubled. up to now, different materials such as z...