Monfared V.,Islamic Azad University at Zanjan |
Daneshmand S.,Islamic Azad University at Majlesi |
Kovove Materialy | Year: 2015
Principal purpose of this research is to study the effect of atomic number and atomic weight on behavior of time-dependent inelastic deformation in metals. For achieving this purpose, analytical and semi-analytical methods are used for analyzing the behavior of the deformations. The elements such as silver, aluminum and nickel are selected for validation of the presented method and obtained results. The effect of other important parameters is investigated for predicting time-dependent behavior of creeping metals. As a result, we can control creep behavior in metals in order to prevent creep rupture. Finally, good agreement is found between presented method and available experimental results. © 2015, Slovenska Akademia Vied. All rights reserved.
Moradi M.H.,BualiSina University |
Asadi M.,ACECR |
Faridi H.,Hamedan University of Technology
International Review on Modelling and Simulations | Year: 2011
Major parts of the peak loads in Iran are related to residential sectors. Thus, implementing a consumption management program for residential areas can decrease the peak load considerably. However, one method of achieving this goal is to use smart load controllers but the consumer satisfaction in residential sectors is also very important in implementing this system. In order to achieve this goal, a load control system was designed by considering Iran's social structure. © 2011 Praise Worthy Prize S.r.l. - All rights reserved.
Hadipour A.,ACECR |
Hoseini Mazinani M.,Islamic Azad University at Tehran |
Mehrafarin A.,Institute of Medicinal Plants
Journal of Medicinal Plants | Year: 2013
Background: Nitrogen is one of the very effective elements in increasing the phytochemical and agronomical yield of medicinal plants. Therefore it is necessary to examine the effect of nitrogen on essential oil and dry matter production of lavender. Objective: This research was carried out to evaluate changes of essential oil content and dry matter of lavender under different nitrogen treatments for reduces of nitrogen fertilizer uses. Methods: The study was conducted at the research field of Islamic Azad University (IAU), Shahr-e-Rey branch, on basis of Randomized Complete Block Design (RCBD) with 4 replication and 7 treatments. The treatments were spraying of 0, 1.5, 3, 4.5, 6 and 7.5 percent N and 180 kg ha-1 nitrogen as urea. Different traits including plant height, stem diameter, branch number, leaves and stems dry weight, foliage dry and fresh weight, essential oil content and composition were recorded. Results: Effect of treatments on all of the plant traits (p<0.01), essential oil content and linalool (p<0.05) were statistically significant differences. The highest amount of plant height and number of stems was observed in spraying of 4.5 percent nitrogen per hectare. Also, the maximum stem diameter, shoot fresh weight, stem, leaves and shoot dry weight, and essential oil content, linalool and 1,8-cineole was obtained in soil treated with 180 kg of nitrogen per hectare. The foliar application of 4.5% of N ha-1 and 180 kg N ha-1 treatments hadn't significantly effect on shoot dry weight and essential oil content. Conclusion: The results showed that nitrogen spraying at appropriate concentration could be improved growth and essential oil content, and also, reduced nitrogen using, contamination, and cost production.
Mohamadian M.,Tarbiat Modares University |
Abrishamifar A.,Iran University of Science and Technology |
Shahrdad M.,ACECR |
Arefian M.,ACECR |
7th Power Electronics, Drive Systems and Technologies Conference, PEDSTC 2016 | Year: 2016
Today there are numerous companies in Iran manufacturing Uninterruptible Power Supplies (UPS). However, in medium and high power range they manufacture online double conversion transformer based UPSs, with thyristor controlled rectifier. In this paper the power topology, control algorithm and experimental results of the first commercial active front end 30 KVA transformerless UPS in Iran is presented. © 2016 IEEE.
Mehdikhani Karimabad H.,Razavi Hospital |
Shabestari M.,Razavi Hospital |
Baharvand H.,Royan Institute for Stem Cell Biology and Technology |
Baharvand H.,University of Tehran |
And 17 more authors.
Acta Cardiologica | Year: 2011
Background Early clinical studies have suggested that administration of granulocyte-colony stimulating factor (G-CSF) may improve the clinical condition of patients suffering from myocardial infarction (MI). This prospective, randomized, double-blind, placebo-controlled single-centre trial aims to assess the safety and clinical efficacy of G-CSF administration in patients with subacute MI and impaired LV function undergoing delayed primary percutaneous coronary intervention (PCI). Methods A total of 16 patients (13 men, mean age 51 years) with subacute ST-segment elevation MI and a left ventricular (LV) ejection fraction (EF) of less than 45% at baseline who underwent late revascularization, were included in the study. Patients were randomized in a double-blind fashion to receive either G-CSF (at a dose of 10 μg/kg body weight) or placebo for five consecutive days. End points consisted of assessment of safety parameters as well as changes of global and regional myocardial function from baseline until six months following PCI. Results G-CSF administration resulted in a significant mobilization of different cell populations (four-fold increase in WBC count and a six-fold increase in CD34+ cells). G-CSF treatment was well tolerated in most patients and no major adverse cardiac events or severe G-CSF-related side eff ects were identified during hospitalization and at follow-up. No significant differences were observed between the G-CSF and placebo groups regarding global and regional myocardial function parameters. Conclusion G-CSF administration is safe, but not effective, in improving impaired LV functional parameters in patients with subacute MI who had an impaired baseline EF of less than 45%.
Akbari K.,ACECR |
Akbari K.,Mälardalen University |
Mahmoudi J.,Mälardalen University |
Ghanbari M.,Sharif University of Technology
Journal of Environmental Radioactivity | Year: 2013
Radon is released from soil and building materials and can accumulate in residential buildings. Breathing radon and radon progeny for extended periods hazardous to health and can lead to lung cancer. Indoor air conditions and ventilation systems strongly influence indoor radon concentrations. This paper focuses on effects of air change rate, indoor temperature and relative humidity on indoor radon concentrations in a one family detached house in Stockholm, Sweden.In this study a heat recovery ventilation system unit was used to control the ventilation rate and a continuous radon monitor (CRM) was used to measure radon levels. FLUENT, a computational fluid dynamics (CFD) software package was used to simulate radon entry into the building and air change rate, indoor temperature and relative humidity effects using a numerical approach.The results from analytical solution, measurements and numerical simulations showed that air change rate, indoor temperature and moisture had significant effects on indoor radon concentration. Increasing air change rate reduces radon level and for a specific air change rate (in this work Ach = 0.5) there was a range of temperature and relative humidity that minimized radon levels. In this case study minimum radon levels were obtained at temperatures between 20 and 22 °C and a relative humidity of 50-60%. © 2012 Elsevier Ltd.
Azizpour M.J.,ACECR |
World Academy of Science, Engineering and Technology | Year: 2010
In this paper, the wear of high speed steel hobs during hobbing has been studied. The wear mechanisms are strongly influenced by the choice of cutting speed. At moderate and high cutting speeds three major wear mechanisms were identified: abrasion, mild adhesive and severe adhesive. The microstructure and wear behavior of two high speed steel grades (M2 and ASP30) has been compared. In contrast, a variation in chemical composition or microstructure of HSS tool material generally did not change the dominant wear mechanism. However, the tool material properties determine the resistance against the operating wear mechanism and consequently the tool life. The metallographic analysis and wear measurement at the tip of hob teeth included scanning electron microscopy and stereoscope microscopy. Roughness profilometery is used for measuring the gear surface roughness.
Dastpak M.,Ferdowsi University of Mashhad |
Matin M.M.,Ferdowsi University of Mashhad |
Farshchian M.,Ferdowsi University of Mashhad |
Arsenijevic Y.,University of Lausanne |
And 7 more authors.
Molecular Biotechnology | Year: 2014
Applications of genetic constructs with multiple promoters, which are fused with reporter genes and simultaneous monitoring of various events in cells, have gained special attention in recent years. Lentiviral vectors, with their distinctive characteristics, have been considered to monitor the developmental changes of cells in vitro. In this study, we constructed a novel lentiviral vector (FUM-M), containing two germ cell-specific promoters (Stra8 and c-kit), fused with ZsGreen and DsRed2 reporter genes, and evaluated its efficiency in different cells following treatments with retinoic acid and DMSO. Several cell lines (P19, GC-1 spg and HEK293T) were transduced with this vector, and functional capabilities of the promoters were verified by flow cytometry and quantitative RT-PCR. Our results indicate that FUM-M shows dynamic behavior in the presence and absence of extrinsic factors. A correlation was also observed between the function of promoters, present in the lentiviral construct and the endogenous level of the Stra8 and c-kit mRNAs in the cells. In conclusion, we recommend this strategy, which needs further optimization of the constructs, as a beneficial and practical way to screen chemical inducers involved in cellular differentiation toward germ-like cells. © 2014, Springer Science+Business Media New York.
Jalali Azizpour M.,Babol Noshirvani University of Technology |
Norouzi S.,Babol Noshirvani University of Technology |
Sajedipour D.,ACECR |
Mohammadi Majd H.,ACECR
World Academy of Science, Engineering and Technology | Year: 2011
In this paper, the residual stress of thermal spray coatings in gas turbine component by curvature method has been studied. The samples and shaft were coated by hard WC-12Co cermets using high velocity oxy fuel (HVOF) after preparation in same conditions. The curvature of coated samples was measured by using of coordinate measurement machine (CMM). The metallurgical and Tribological studies has been made on the coated shaft using optical microscopy and scanning electron microscopy (SEM).
PubMed | ACECR
Type: | Journal: Journal of environmental radioactivity | Year: 2012
Radon is released from soil and building materials and can accumulate in residential buildings. Breathing radon and radon progeny for extended periods hazardous to health and can lead to lung cancer. Indoor air conditions and ventilation systems strongly influence indoor radon concentrations. This paper focuses on effects of air change rate, indoor temperature and relative humidity on indoor radon concentrations in a one family detached house in Stockholm, Sweden. In this study a heat recovery ventilation system unit was used to control the ventilation rate and a continuous radon monitor (CRM) was used to measure radon levels. FLUENT, a computational fluid dynamics (CFD) software package was used to simulate radon entry into the building and air change rate, indoor temperature and relative humidity effects using a numerical approach. The results from analytical solution, measurements and numerical simulations showed that air change rate, indoor temperature and moisture had significant effects on indoor radon concentration. Increasing air change rate reduces radon level and for a specific air change rate (in this work Ach = 0.5) there was a range of temperature and relative humidity that minimized radon levels. In this case study minimum radon levels were obtained at temperatures between 20 and 22 C and a relative humidity of 50-60%.