Showing 7 results for Nabipour
Volume 3, Issue 2 (9-2014)
Abstract
Cone snails of the genus Conus are highly regarded for their medicinal compounds derived from their toxins. In order to examine the venom apparatus structure, 12 specimens of C. textile were collected from the coastal zone of Gheshm Island and fixed in Bouin's for 48 hours and transferred to laboratory in ethanol. After breaking of shellfish, the venom apparatus were isolated and their different parts (after molding and cutting) were stained by HE and HEG and photographed by Nikon microscope. The stereomicroscope observation showed that the venom apparatus consisted of (1) toxin production part (venom duct), (2) toxin transmission part (venom bulb), and (3) injection part (radula and proposcis). Photographs of sections showed that the venom bulb was completely muscular, consisting of longitudinal and transverse muscle fibers, and in their middle part a channel with epithelial cells was observed. Venom duct walls composed of 3 parts including the outer layer of muscle an inner layer of columnar epithelial cells with basal nucleus and the inner lumens which filled by the granules. HEG stained slides showed a much sharper cytoplasmic and nuclear implementation, particularly granules containing toxins were easily countable and measurable. Although the onventional HE staining method clearly showed different parts of the gland, but HEG method in addition to distinguishing different sections of tissue, seemed to be a suitable technique for studying the role of different parts of the organ in producing conotoxin in the form of secretory granules.
Volume 3, Issue 2 (6-2015)
Abstract
Aim: Health locus of control includes the degree of a person's belief in the fact that his/her health is controlled by internal or external factors. The aim of this study was to determine the status of health locus of control and its related factors among Iranian pilgrims.
Methods: This cross-sectional study was performed on 600 pilgrims of the holy shrines in Tehran in 2015. People aged over 15 years who had come for pilgrimage to the shrines entered the study by convenient sampling and after consent. The A form of the Multi-dimensional Health Locus of Control scale was used. This form consists of Internal Health Locus of Control (IHLC), Powerful others (PHLC) and Chance External Locus of Control (CHLC). The relation of between age, gender, education, income, marital status and location of residence on each construct was evaluated by t-test, ANOVA and linear regression through SPSS21.
Findings: Among the total pilgrims, 302 were females (50.3%). The mean age of the participants was 33.15±11.06 years. The highest and lowest averages were associated with the internal locus of control (25.60±3.34) and the chance locus of control (18.20±5.13), respectively. There was a significant relationship between educational level and IHLC; between income and education level with CHLC; and between marital status and age with PHLC.
Conclusion: According to our results, most people think that they control their health or life events themselves. People with a higher internal locus of control score have more tendency to practice health promotion and disease prevention and seek health through visiting holy sites and appealing to God.
Mojtaba Nabipour, Amir Hossein Behravesh, Behnam Akhoundi,
Volume 17, Issue 1 (3-2017)
Abstract
This paper presents an experimental study on the effects of printing parameters on the tensile strength of the polymer-metal composites printed via Fused Deposition Modeling (FDM) technique .In the recent years, 3D printer systems have been widely employed in various industries. FDM is one of the most widely used 3D printer systems worldwide due to its simplicity and lower cost. Although extensive research works have been carried out in the area of 3D printing, less efforts have been reported in developing new materials and their use in FDM process. The materials utilized in this study consisted of Cu particles in ABS polymeric matrix with a constant 25 wt.% of metal powder. The filament production line was implemented to accustom with the manufacturing process. The printing variables were selected as nozzle (orifice) diameter, layer height, fill pattern and nozzle temperature that were examined in three levels. Taguchi method was employed to find the optimal FDM process parameters. The main effect, signal-to- noise ratio and analysis of variance were employed to analyze the process parameters in order to achieve optimum tensile strength of the composite material specimens. Finally, the specimens were produce at the optimized parameters to confirm the tests and method.
Mostafa Nabipour, Seyed Ali Akbar Salehi Neyshabouri, Seyed Hossein Mohajeri, Amir Reza Zarrati, Mohammad Zabetian Toroghi,
Volume 17, Issue 8 (10-2017)
Abstract
In compound channels, in addition to shear flow originated from the bed (boundary layer flow), other forces are generated by momentum transform between the main channel and the floodplain (free shear layer). Due to such special type of momentum transport, a complicated three-dimensional flow structure forms in a compound channel. Previous studies showed that in a compound channel, secondary currents are enhanced for shallow overbank flow and consequently the complexity of flow structure increases. However, this complexity has not be described properly. To explore turbulent structure of a shallow overbank flow, flow field is measured in a compound channel with vertical walls using Particle Image Velocimetry. The results show that in the main channel, the maximum amount of streamwise velocity occurs below the floodplain level. Whereas in previous studies in compound channels with inclined transitional wall, turbulence intensities profiles in the main channel showed two different trends at lower and higher elevations of the floodplain invert, in the present study three different increasing or decreasing trends were observed for Reynolds shear stress and longitudinal turbulence intensity profiles and four different trends was observed for vertical turbulence intensity. Bed shear velocity was approximately constant in the floodplain but it increased near the interaction zone.
Mostafa Nabipour, Ali Akbar Salehi Neyshabouri, Reza Sadeghi Dodaran, Amir Reza Zarrati, Hossein Mohajeri, Mohammad Zabetian,
Volume 18, Issue 1 (3-2018)
Abstract
One of the practical and useful techniques for the flow field measurement in open channels is Acoustic Doppler Velocimeter (ADV). Presence of ADV probe and its holding system against flow disturb natural flow pattern which can change turbulent flow structure. Thus, the error of the Acoustic Doppler Velocimeter is consist of its intrinsic error and the presence of ADV against flow. To have better understating about this effect, in this paper, flow field in an open-channel is measured using Particle Image Velocimetry (PIV) technique and side-looking ADV probe. The results show that sreamwise velocity obtained from both methods are in good agreement and on average, there is 5 percent difference, while vertical and lateral components of velocity are considerably different. Also, comparison of sreamwise and lateral turbulence intensities and the Reynolds shear stress shows lower differences for measured points near the water surface and the differences increase approaching to the bed.
Volume 21, Issue 155 (12-2024)
Abstract
The juice industry is seeking cost-effective Pulsed Electric Fields (PEF) reactor systems to treat bulk fluid. The paper discusses the development of a helix-shaped glass chamber (HSGC) for PEF treatment in the juice industry. PEF treatment is a non-thermal technology used for the preservation and processing of fruit juices. The HSGC design aims to improve the efficiency and effectiveness of PEF treatment by enhancing the distribution of electric fields within the chamber. The PEF treatment is believed to be biochemical and physical parameters. The traditional designs don't have good attributes for uniformity of PEF treatment and long fluid residence time. The developed HSGC was successfully applied on mango juice samples, and variation of chemical parameters including viscosity and conductivity, including microbial inactivation of microorganisms (Escherichia coli), was explored. The results are compared with the new values of the juice condition. The simulation results indicate that the juice fluid remains at a normal temperature range of 20-25°C. The results were encouraging and discussed, suggesting that HSGC is a viable option for processing sour mango juice with a significant amount of microbial inactivation without adversely affecting the physical and biochemical parameters. In addition, it is effective for long-term preservation of fruit juices and liquids. The residence time in the treatment chamber, the intensity, and uniformity of PEF treatment affect the variation in chemical. The results demonstrate the feasibility and advantages of using the helix-shaped chamber for PEF treatment, offering potential benefits for juice quality and shelf life. Overall, the paper provides valuable insights into the development of innovative technologies for the juice industry.
Volume 23, Issue 2 (5-2023)
Abstract
In order to estimate the amount of flood damage, knowledge of flow characteristics such as speed and flow rate is very important. Nowadays, the use of large-scale particle image velocimetry method is used to estimate flow parameters and flow field in laboratory and field scale. But image processing in relation to important environmental parameters has not been well investigated. To be more precise, the effect of environmental parameters such as; The position of the camera, the speed coefficient, and the sensitivity of the probe window have not been measured. The basis of this research is based on image processing methods, through which flow rate and flow field are calculated. In this study, the capabilities of this method have been accurately measured on a laboratory scale in relation to effective environmental parameters. In this regard, the investigation window of this study shows that the window of 20 pixels provides better results in different depths. In relation to the position of the camera, the studies showed that the placement of the camera obliquely provides the desired results. Regarding the speed coefficient, the studies show that the coefficient between 0.85 and 0.9 provides the best results. The results of the research in laboratory conditions based on the depths of 12.5, 15.5 and 18.5 cm indicate that by using the large-scale particle surface velocimeter system, according to the selection of the optimal conditions, the selection of the appropriate computing network ; camera position; Selection of the search window optimization; hydraulic specifications as well as the appropriate selection of the speed coefficient; It estimates the values of flow rate and flow speed with optimal accuracy. The relative error values of discharge and flow velocity in this research based on the LSPIV method for depths of 12.5, 15.5 and 18.5 cm are equal to 6.5,3.1 and 2.1 percent.
