Objective(s): The partial volume effect (PVE) of single-photon emission computed tomography (SPECT) on corpus striatum imaging is caused by the underestimation of specific binding ratio (SBR). A large ROI (region of interest) set using the Southampton method is independent of PVE for SBR. The present study aimed to determine the optimal ROI size with contrast and SBR for striatum images and val...

This paper analyzes the effect of fluid flow characteristics on convection heat transfer for mini-helically coiled tubes (HCT) using supercritical carbon dioxide (CO2) as a natural refrigerant. Two experimental cases have studied in this work at different diameters with coil pitches analyzing resistance. In first case, inner tube diameter, diameter and pitch were 5 mm, 200 mm 10 respectively, w...

We evaluated the blood pressure-lowering activity, tolerability, and safety of losartan in 112 hypertensive (sitting diastolic blood pressure, 90 to 115 mm Hg) patients with chronic renal insufficiency including mild renal insufficiency (30 to 60 mL/min per 1.73 m2; n=51), moderate to severe renal insufficiency (10 to 29 mL/min per 1.73 m2; n=33), or hemodialysis (n=28). After a 3-week placebo ...

background: narcotic addiction is one of the most important problems in human communities that unfortunately it's prevalence has been increased in our country inconveniently. opium has various effects on the parts of body. many studies has been performed about these effects, but opium effect on common bile duct has allocated only small quantity. materials and methods: this study is a cross-sect...

AIMS Structural and functional left ventricular alterations can occur in heart failure (HF), referred to as left ventricular reverse remodelling (LVRR). This study aimed to define novel predictors of LVRR besides well-known effects of medical and device therapy. METHODS AND RESULTS From echographic database, we included 295 patients with both left ventricular ejection fraction (LVEF) ≤45% and...

In this research, biodiversity was investigated in the species diversity level. The objective of this research was to study of Norway Maple (Acer platanoides L.) dispersion and biodiversity of associated woody species in the Shafaroud forests, Gilan (IRAN). In this regard, a 0.5 ha lozenge sample plot was selected with considering presence of Norway Maple in each site. In each plot, geographic ...

Degradation is a common problem for polymer matrix composites (PMCs) under low thermal cycling conditions. This paper investigates the effects of low thermal cycling on total mass loss (TML) and surface degradation of PMCs. Unnotched and open-hole specimens were weighed before and after low thermal cycling. The total mass loss and surface degradation of the specimens were studied over 250 cycle...

the purpose of this study was to determine the influence of platform switching on stress distribution of two different implant systems using three-dimensional (3d) finite element models.six 3d finite element models were created to replicate two different implant systems with peri-implant bone tissue, in which six different implant-abutment configurations were represented: model xive-a: 3.8-mm-d...

this study was conducted to evaluate different nutrient solutions effects on agria potato mini-tubers production under aeroponic system. the experiment was conducted in the laboratory and greenhouse of ardabil sabalan behparvar company in 2013. four recommended nutrient solutions including: lommen and struik (1992), kang and han (2005), otazu (2010) and hoagland and arnon (1950) were used in a ...