When water vapor in moist air reaches supersaturation a transonic flow system, non-equilibrium condensation forms large number of droplets which may adversely affect the operation some thermal-hydraulic equipment. For better understanding this condensing phenomenon, numerical model is applied to analyze system by using theory nucleation and droplet growth. The Benson adopted correct liquid-plan...

Ejectors are devices usually made of two convergent-divergent coaxial nozzles which are used to convert pressure energy into kinetic energy. These devices involve very complex phenomena which strongly affect their performance. Flow visualization methods are often used to provide precious information as for the nature of the flow within the ejectors and the comprehension of the physical phenomen...

background: exposures to lead above the threshold value of 50–60 μg/dl have been linked to diminished semen quality parameters. worldwide, the lead exposure has been diminished during the last years. therefore, it has become of a great concern to examine the effects of lead exposures on semen quality at low levels of exposure. objective: to evaluate the effect of low level (<20 μg/dl) blood lea...

AIM To evaluate ex vivo degradation of gutta-percha following six thermoplastic obturation techniques. METHODOLOGY Ninety human-extracted mandibular premolars were selected and divided randomly into nine groups for filling. Group 1: thermomechanical compaction for 3 s with Konne gutta-percha points (Konne Ind. e Com. de Mat. Odontol., Belo Horizonte, MG, Brazil); Group 2: thermomechanical com...