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Flexible roll forming is a modern process for producing profiles with changing cross section. One of the important defects in this process is the web warping of product that causes failure to obtain dimensional and geometrical tolerances. In this paper, mechanism of web warping occurrence was investigated by finite element simulation in ABAQUS/CAE software. Results of simulation indicated that inadequate longitudinal strain in the edge of profile’s flange in transition zone is the reason of profile’s web warping. Furthermore, the effect of geometric parameters of product such as flange length, bend angle, radius of transition zone and thickness on the web warping were determined. Analysis of variance showed flange length and bend angle are recognized as the most effective factors on warping of profiles with specific thickness. An equation for prediction of warping was proposed in terms of geometrical parameters of product. In order to verify the finite element model, the longitudinal strain of deformed strip edge was obtained from simulations and compared with the experimental results of other researchers. A good agreement between them confirmed the accuracy of the finite element model.

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In this paper, the result of a numerical study on the natural convection in an inclined T shap cavity filled with Water-Cu nanofluid with the presence of a constant magnetic field was investigated. A heat source embedded on the bottom wall of enclosure, the upper wall is cold and the other walls are adiabatic. Discretization of the governing equations are achieved through a finite volume method and solved with SIMPLE algorithm. The Hartmann number has been varied from 0 to 80 and the cavity has been twisted under the angles between 0 to 90 degrees. The findings of study show that the effect magnetic field on the average Nusselt number is higher in high Reyleigh number. In Ra=105, the increase in nanofluid, to the Hartman number 20, contributes to decrease of the average number and in the Hartman number 40 and more, causes the average Nusselt number to increase. In Ra=106 , the increase in nanofluid, to the Hartman number 20, contributes to increase of the average number and in the Hartman number 40 and more, causes the average Nusselt number to decrease. The results also indicate that, the maximum heat transfer, in Ra=105 and Ra=106 accurse at 67.5° angle. the minimum heat transfer, in Ra=105 and Ra=106 accurse at 0° and 22.5° angle respectively.

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This paper concerns with a similarity solution for mixed-convection boundary layer copper-water nanofluid flow over a horizontal flat plate. Appropriate similarity variables are used to convert the Governing PDEs to ODEs and the resultant equations with the nanofluid properties relations are discretized and solved simultaneously using finite-difference Keller-Box method. The effects of change in plate temperature, the volume fraction of nanoparticles, and the mixed-convection parameter, on friction coefficient, Nusselt number and velocity and temperature profiles are investigated. The results show that, the Nusselt number increases as the mixed-convection parameter and the volume fraction of nanoparticles increases. This enhancement is about 10 percent for the nanofluid with 4% volume fraction of nanoparticles, compared with the pure water. In this range, moreover, the friction coefficient parameter increases about 20 percent. However, the lower the mixed-convection parameter is, the effect of nanoparticles on the friction coefficient increment is more. The results also illustrate that the effect of the surface temperature on the increment of Nusselt number and on the reduction of friction coefficient is more considerable in higher mixed-convection parameter and volume fraction of nanoparticles. Also by increasing surface temperature, the temperature of nanofluid decreases at any surface distance.

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The propose of  this study was to investigate the production of biodegradable edible film............

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In this paper, cold roll forming process of a high strength steel pipe using four types of flower pattern including circular, edge, double radius and reverse bending is simulated with finite element method in MSC Marc Mentat software. Due to importance of quality of final pipe and in order to achieve the desired geometry in high strength steel pipes, selecting the appropriate flower pattern to design the pipe roll forming production line is considered. Using finite element simulation results, deformation of sheet in this process is studied and effect of flower pattern type on geometry of final product, which includes curvature distribution, spring back and thickness distribution of pipe, is investigated. Results show that implementing reverse bending flower pattern, leads to reduction in deviation from mean curvature at edge of the sheet up to about 65 percent. Thickness distribution analysis shows that circular and edge flower patterns cause upsetting and thinning of edge of the sheet up to 0.2 millimeters, respectively. But, use of double radius and reverse bending patterns cause average thickness of edge to be well adjusted to reach 2.8 millimeters. Also, circular flower pattern has the lowest value of spring back in terms of variation of mean relative curvature of 0.69 percent and edge deviation of 0.15 millimeters. To validate the finite element simulation, experimental tests were designed and conducted using one forming stand. By comparing resultant data of experimental tests with simulation results, validity of finite element simulation confirmed.

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The tube spinning process is one of the forming processes to fabricate conical seamless tubes. This process is done warm or cold, with or without mandrel. In this article, the possibility of forming of an Al-6061 conical tube by hot die-less spinning process has been investigated. An estimation of tangential force and required power can be obtained by analytical methods. So, the ideal work and upper bound methods have been utilized to derive equations for calculation of tangential force and required power of forming. An identical result was acquired for the two methods. The proposed equations can be used in design stage of the process. Furthermore, final thickness and initial length of the tube have been calculated by using of geometrical relations and constant volume law. The proposed formulation has been compared by experimental results. The final thickness and initial length of the tube are in good agreement with experimental results. An error of 0.5% and 5.5% were observed for final thickness and initial length, respectively. The obtained equation for the final thickness is a cosine function of the conical angle. Hence, it predicts higher final thickness in comparison with the sheet spinning process.

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Objective: Cryptorchidism is the most common deficiency of the male reproductive system and most prevalent endocrine disease of boys at birth. Insufficient prenatal anti-Müllerian hormone (AMH) secretion from Sertoli cells of the testis is one of its causes. The role of this hormone and inhibin B in fertility has recently been proven. AMH is a known indicator of Sertoli cell function. The aim of this study was to assess the relationship between anti-Müllerian hormone, inhibin B, testosterone, and semen parameters in post-pubertal cryptorchidism patients. Methods: We gathered the data of this cross-sectional study from blood and semen samples of 20 patients who had a history of unilateral cryptorchidism. Patients, 20-40 years of age, referred to the Urology Ward of Shariati Hospital, Tehran, Iran. Serum levels of AMH, inhibin B and testosterone were analyzed by enzyme-linked immunosorbent assay. Semen analysis was performed by means of a computer aided semen analysis system 6.5.0. Pearson’s correlation test was used to evaluate the relationships between variables. Result: Significant positive relationships were existed between total sperm motility and sperm concentration (r=0.086; p<0.01), total motility and fast progressive motility (r=0.97; p<0.01), sperm concentration and fast progressive motility (r=0.9; p<0.01), white blood cell count and sperm concentration (r=0.63; p<0.05), white blood cell count and sperm motility (r=0.66; p<0.05), white blood cell count and sperm fast progressive motility (r=0.77; p<0.01), and testosterone levels and serum AMH (r=0.6; p<0.01). Conclusion: Cryptorchidism patients in this study had lower serum concentrations of AMH, inhibin B and testosterone than the normal limits. Despite the positive correlation between serum testosterone and AMH, none of the investigated hormones showed any significant relationship with semen parameters.

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In recent years, attention to the land spatial planning approach in country with a holistic approach in the framework of spatial development has caused the creation of coordinator institutions and their duties determination in the ultra-provincial level to be considered in the post-fourth development program to coordinate the inter-provincial developmental and civil affairs in the spatial planning perspective. This directive specifies the duty and position of spatial planning studies in the country provinces of macro-regions and regional proceedings will be achieved after carrying out the spatial planning studies and paying attention to their operational approach. According to the spatial planning zooning approved by the Council of Ministers in 2010, Qom province is located in the South Alborz Region and in the vicinity of Tehran, Alborz, Qazvin, Zanjan, Markazi and Semnan. Due to its geographical location in the vicinity of Tehran province as one of the most populated provinces of country in one hand and being located in the north of Isfahan province on the other hand, Qom province can be a suitable goal to make the inter-provincial coordination of Macro-Regional South Alborz, i.e. a place for attracting the tended investments to these regions, especially Tehran. To obtain this purpose, the effective factors in the spatial planning executive approach of Qom province were studied as a case study to answer the researcher questions. In this study, the research data has been collected by using an analytical-descriptive method and a documentary method and Delphi technique. Data analysis has been carried out by cross-impact matrix and Mic Mac software and effective factors in the spatial planning executive approach of Qom province have been identified. The most important factors include: Qom political-religious centrality, proximity to the capital and the existence of desert areas. And very effective factors which have a high capacity to become the key factors including the factors such as the role of inter-provincial interactions, the existence of a special economical region of Salafchegan and the province position in the country east-west corridor have been identified and according to their effectiveness, suitable solutions have been proposed to executive approach.

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