Efforts to expand the science, technology, engineering and mathematics (STEM) work- force have been topics of United States policy action for more than 50 years (Hira 2010). Unfortunately, among U.S. undergraduate curricula, STEM has one highest attrition rates (Tinto 1993) with less half students in that enroll an program ultimately receiving a degree field (Hayes 2009). Naturally, high rate i...

since reusing waste tire as a cheap filler is considerably high, in this study, recycled rubber to replace nr/br is used up to 15 phr and the positive and negative aspects of the rubber powder and reclaimed rubber in the physical, dynamical and processing properties are evaluated. the results showed that in the presence of recycled rubber, the cure rate, crack growth resistance, tear strength a...

background: peritoneal dialysis is one of the most prevalent types of dialysis prescribed to the patients suffering from renal failure. studies on the factors affecting the survival of these patients have mainly used log-rank test and cox analysis. the present study aimed to investigate the risk factors affecting short- and long term survival of patients on continuous ambulatory peritoneal dial...

background the cause of death in burn patients after 48 hours of hospitalization has been reported to be bacterial infections. recently, due to the compounds accelerating the healing process and the intense reduction of treatment side effects, medicinal plants are used to cure burn wound infections. this study aims to investigate the medicinal effect of the ethanolic extract of scrophularia str...

This study evaluated the effect of preliminary irradiation on the depth of cure and Knoop hardness of a veneering composite. The composite was filled into a mold, and irradiated with different irradiation duration or irradiance. After removing the mold, the depth of cure was measured, and the Knoop hardness number at each depth was determined and statistically analyzed using Mann-Whitney U test...

A micromechanics based thermal model was developed to predict the temperature and degree of cure (DOC) distribution inside a unidirectional fiber reinforced composite during the curing process. Using the concentric cylinder assemblage (CCA) model as a representation of the composite microstructure, the effective thermodynamic properties of the composite were computed based on the fiber and matr...

PURPOSE The aim of this study was to evaluate the effect of thickness of zirconia on curing efficiency of resin cements. MATERIALS AND METHODS Four discs with 4.0 mm in diameter were prepared from non-HIP translucent zirconia blocks using a CAD/CAM system and feldspathic ceramic was layered onto discs. Thus, 4 ceramic disc samples were fabricated: (G) 0.5 mm zirconia- as a control group, (G1)...