objective: ionizing radiation produces free radicals which induce dna damage and cell death. origanum vulgare leaf extract (ovle) is a natural compound and its capability of scavenging free radicals and its antioxidant activity have been demonstrated by many researchers. in this study, using micronucleus assay, radioprotective effect of ovle against clastogenic and cytotoxic effect of gamma irr...

Due to temperature increase during bone drilling, bone necrosis is likely to occur. To minimize bone tissue damage during drilling, a detailed in vitro experimental study by using fresh calf cortical bones has been performed with various combined drilling parameters, such as: drilling environment, drill diameter, drill speed, drill force, feed-rate and drill coating. Bone temperatures at the dr...

biodiesel fuel, which is produced by transesterification reaction between alcohol and vegetable oil/animal fat is proposed as a clean alternative to petro diesel fuel. today, one of the new technologies to produce biodiesel is using ultrasonic energy that makes production faster, with improved quality and less expensive. various factors that affect the design of ultrasonic reactors are ratio of...

introduction: the low regeneration of bone in defective bones causes therapeutic problems. various strategies to assess the healing of bone defects have been used which they include histological and histo-chemical analysis in an invasive study. the purpose of this study was to determine the ultrasonic parameters of bone as a promising noninvasive technology for assessing bone repair process. ma...

The critical heat flux occurring during upflow of boiling water in vertical smooth and porous-coated tubes were investigated experimentally. experiments performed at low pressures from 0.11-0.7 MPa mass fluxes 100-400 kg/m2s, with inlet subcoolings 1-70 K. carried out four test sections, two which porous coated by sintering. each the cases, smooth, had same geometries (L/D = 28.3, L/D 38.75) to...

Abstract The undrained shear strength (Su) and cohesion (Cu) of cohesive soils are frequently determined using an unconfined compression test. However, the test results heavily dependent on specimen size. This causes uncertainty in geotechnical analyses, constitutive models, designs by overestimating or underestimating soils. Therefore, study aims to assess effect height-to-diameter ratio compr...