Showing 13 results for Avami
Volume 0, Issue 0 (Articles accepted at the time of publication 2024)
Abstract
Gemination is a prevalent process in Shahmirzadi, a language of the Northwestern branch of Modern Iranian language family spoken in Shahmirzad (Semnan province). This paper presents examples of gemination in verbs, nouns, and adjectives in Shahmirzadi which occur morpheme-internally and externally. Data was gathered from 5 illiterate to Master’s level female and male middle aged and older Shamirzadi native speakers and analyzed within the framework of OT. We observed that gemination is the result of synchronic as well as diachronic assimilation in Shahmirzadi and that progressive and regressive assimilation patterns are themselves the result of two different constraint-rankings of manner and place of articulation and reciprocal-assimilation emerges out of these two rankings.
Volume 2, Issue 7 (Autumn 2021)
Abstract
Every business owner knows that profitability is delivering what customers want. In the sports industry, to stimulate the desire for sports and create a sense of sportsmanship, it is necessary to pay attention to the desires of society. The purpose of this study is to identify the influential factors of the sense of desire for sports in Iranian society, which is among qualitative research and in terms of purpose, fundamentals and terms of strategy; Qualitative research is an exploratory type, and in terms of research method, it uses the technique of fundamental theory. The statistical population of the study was 16 managers, specialists and experts. In-depth and semi-structured interviews were conducted purposely using the snowball method. Findings showed that the development of public sports, emphasis on health-oriented sports, the need to pay attention to educational sports, and economic and cultural factors are the main categories of the final model of the present study.
Volume 13, Issue 54 (8-2015)
Abstract
The research aimed at mathematical modeling, kinetics and energy consumption of a hot air dryer with air recycle (0, 50%, and 75%). A hot-air dryer capable of recycling the exhaust air was used. The experimental data were fitted to standard thin-layer drying models in MATLAB 2007. The best model was selected according to the coefficient of correlation (R2), chi-square (c2) and root mean squares error (RMSE). These indices showed that the Midilli et al. model has the best fit for explaining the experimental data. The required energy was minimum at 0.5 m/s and 60˚C for 0%, 50% and 75% recycled air levels and was maximum at 1.5 m/s and 40˚C for all recycling levels. The hot-air recirculating system also reduced energy requirements and increased the drying time for aloe vera.
Mohammad Hossein Aliee, Ramin Roshandel, Akram Avami,
Volume 17, Issue 3 (5-2017)
Abstract
In today’s world, using of biogas is increasing due to its methane content, renewability, and low price. Solid oxide fuel cell is one of the best energy conversion technologies, in order to use biogas and it has a high potential to integrate with the gas turbine. In this paper, solid oxide fuel cell-gas turbine hybrid system, which is fed by biogas is modeled with respect to energy and economic aspects. Maximization of electrical energy efficiency and minimization of total investment cost are objective functions, which are considered to find the optimal design variables of the hybrid system. First, each component of the hybrid system is modeled and validated individually. Then, in order to optimize the hybrid system, multi objective optimization via NSGAII is implemented and optimal values of design parameters of the hybrid system were calculated. Optimal point is obtained using Euclidian non-dimensionalization and LINMAP decision making method in Pareto front. So, optimal design values are 66 percent and 175227.4 $, which are electrical energy efficiency and total investment cost, respectively. In optimal point Levelized unit cost is 6.3 cent per kWh. Finally, in order to determine the effect of design parameters on the objective functions, sensitivity of each design parameters were analyzed using Sobol's sensitivity analysis method. Results show that compressor pressure ratio has the maximum effect on electrical energy efficiency. Furthermore, turbine isentropic efficiency and fuel cell current have the maximum effect on the total investment cost.
Mohamad MirghAvami, Hadi Sotoude, Seyed Farshid Chini, Alireza Riasi,
Volume 17, Issue 12 (2-2018)
Abstract
Small scale hydraulic power plants equipped with very low head (VLH) axial turbines can be considered as a novel approach to extract energy from rivers and canals. In this study, design process and numerical simulation of a prototype of a VLH turbine is done. The selected turbine generates 450 kW power at the head of 2.6 m. In order to generate the turbine geometry using MATLAB and X-Foil, a computational code has been developed. The design process to generate finalized geometrical data of the runner blades contains a primary hydrodynamic design using Euler equation in turbomachinery, a classical approach for axial turbomachinery design and selection of hydrofoils with appropriate lift coefficient. Using the geometry and structured mesh generated by Turbo Grid for discretization of governing equations, the numerical simulation was accomplished by ANSYS CFX. Simulation results of different opening angles of the runner blades are presented for the turbine system including runner and guide vanes. Also, cavitation possibility is studied in various opening angles and discharges. The results demonstrate that the hydraulic efficiency of the VLH turbine is approximately 89% where the opening angle of the runner blades is at the design point. Moreover, cavitation does not occur at the design point. However, at flow rates larger than the nominal flow rate, and at opening angles larger than the design point cavitation at the leading edge is possible
Volume 17, Issue 98 (April 2020)
Abstract
Background: Sesame is one of the most consumed oilseeds that despite being rich in mineral salts, contains some anti-nutritional compounds that are limiting nutrients to the body. Therefore, the aim of this study was to investigate some of the antinutritional compounds (oxalate and phytate) and heavy metals (lead and cadmium) in sesame oil, raw and peeled sesame seed (Sesamum indicum L.) of two varieties; Dashtestan 2 and Darab 14; Cultivated in Iran.
Material and methods: Sesame seed samples were collected from Seed and Plant Certification and Registration Institute in Karaj, iran. Oxalate and phytate were determined using High Performance Liquid Chromatography (HPLC) methods and Pb, Cd, Ca, Mg, Fe, Zn and Mn were determined using atomic absorption spectrophotometry (AAS).
Results: The lead content of all samples is higher than the maximum permissible level and their cadmium content is below the maximum permissible standard in Iran. The Darab variety contains more phytic acid and the Dashtestan variety has higher oxalic acid content. Most of the minerals in the samples are calcium. The oil extracted from the raw sesame seeds lacks phytic acid and contains about 2.5 mg/Kg oxalic acid.
Conclusion: The raw sesame seeds have some anti-nutritional compounds that significantly reduces by peeling, while the amount of these compounds in sesame oil is much lower than the standard Iranian and Codex. Therefore, it is better to evaluate its quality before using raw sesame seeds.
Volume 18, Issue 121 (March 2022)
Abstract
Recent epidemiological studies have indicated the anticancer activity of an isothiocyanate compound named sulforaphane that exists in cruciferous vegetables. Broccoli sprouts are popular because of containing far more anticancer, antioxidant, glucosinolate, and polyphenolic compounds than in mature broccoli. The main objective of this research was to produce a vegetable smoothie based on broccoli sprouts as a nutritious, health-enhancing snacking-drink. Broccoli sprouts were added at six different levels (0%, 2.5%, 5%, 7.5%, 10%, 12.5%, 15%) to a green smoothie made with carrots, apples, spinach, avocado, orange, lime, Stevia, and Gellan gum. Physicochemical, rheological, and sensory properties, along with levels of the bioactive compounds (Phenolic, antioxidant capacity, Chlorophyll), were studied during storage for 14 days at 5°C. The results showed that the addition of 15% broccoli sprout to the smoothie increased synergistically the phenolic compounds content and antioxidant activity by 38% and 24%, respectively. All of the treatments showed viscoelastic behavior. A pseudoplastic behavior with a flow index of less than 1. Sensory evaluation of the smoothie samples indicated the highest overall acceptance for smoothie samples containing 12.5% of broccoli sprout and using the higher levels negatively affected the sensory properties. As a result, a green smoothie containing 12.5% broccoli sprouts could be introduced as a health-promoting snacking-drink.
S. GhAvami Gargari, H. Ghaebi, M. Rahimi,
Volume 19, Issue 3 (March 2019)
Abstract
In this paper, a novel multi-generation system based on gas turbine-modular helium reactor cycle is presented. Integrated system consists of a Gas turbine-modular helium reactor cycle as a base cycle and from the combination of subsystems, hydrogen production, absorption refrigeration cycle, and desalination system. Thermodynamic comprehensive modeling (energy and exergy) was done on the suggested system. The effect of various system parameters, such as turbine inlet temperature, compressor pressure ratio, carbon dioxide to methane molar ratio, vapor generator temperature, and mass flow rate of the desalination system have been evaluated on the overall performance of the system. Also, optimization of the overall system using single and multi-objective optimization method has been investigated in terms of energy and exergy compared to the base case. The results showed that the maximum net power output and the energy efficiency and exergy of the overall system in compressor pressure ratio between 2.3-2.45 were 275 MW, 72.05%, and 49.35%, respectively, and with increasing turbine inlet temperature, heat production rate and energy and exergy efficiencies of overall system increases and the cooling production rate and freshwater decreases. In addition, the optimal point of the mass flow ratio of the desalination system for the energy and exergy efficiencies of overall system is 2.857. According to the results obtained in the multi-objective optimization method, the energy and exergy efficiencies of overall system were 74.41% and 50.21%, respectively, and exergy destruction has been reduced to 0.74% compared to base case.
Y. Hojjat, B. GhAvami Namin,
Volume 19, Issue 11 (November 2019)
Abstract
The aim of this research is to design and fabricate an actuator, which operates based on reaction forces between current carrying stator coils and magnetic arrays (Halbach arrays) connected to the mover, in order to move a motion stage for positioning objects. Thus, according to the initial and intended position of the mover, current commutation in stator coils is changed in a way that required force for transporting the mover to the desired position is provided. In this research, the integration of two perpendicular synchronous linear motors is utilized in order to create the planar motion. The stator consists of two sets of rectangular coils, which are placed perpendicular to each other. Mover consists of four Halbach arrays, which two Halbach arrays are used for x-axis motion and the other two arrays are used for y-axis motion. First, the analytic relationship between the applied magnetic force and current commutation was introduced. Then, the design parameters such as mover dimensions and stator workspace were determined. Concerning these parameters, dimensions of cubic magnets for Halbach array fabrication were obtained and with respect to array dimensions, the dimensions and number of turns for stator coils were determined. Using these design parameters and commutation equations, the planar motion of the actuator was simulated. The simulation results showed good agreement with the analytical results. Experimental tests were conducted in order to investigate the positioning capabilities and 2 dimensional motion. The precision of the fabricated actuator is 5mm and the minimum response time of actuator is 0.5sec. The minimum position error occurs at 25mm position that is due to the closeness to motor magnetic period.
Volume 20, Issue 142 (December 2023)
Abstract
Considering the high perishability, quality reduction, and nutritional value of the fish during the storage period, the aim study is to investigate the edible coating based on chicken feet gelatin/green walnut skin extract to preserve the physical characteristics, color, and texture properties of Oncorhynchus mykiss fillet during storage in the refrigerator. After extracting gelatin and green walnut skin extract, the coating solution were prepared. The fillets were coated by immersion method. Physical characteristics (moisture), color indices (L*, a*, and b*) as well as textural properties (hardness, springiness, and Cohesiveness) of the fillets were evaluated during 12 days of storage (on days 0, 4, 8, and 12). Variance analysis was performed by Minitab software (version 18). The mean data comparison by Tukey's test is at a 95% confidence level. The results showed significant moisture retention of coated fillets (p<0.05). The L* and a* index of fillets decreased during 12 days of storage. While, the b* index was increased in all samples (p<0.05). The evaluation of the texture of the fillets showed a decrease in hardness and Cohesiveness, but springiness was increased (p<0.05). The coat had significantly higher hardness, Cohesiveness, and lower springiness than the control sample (p<0.05). Increasing the concentration of green walnut skin extract from 500 to 1000 ppm increased the quality of fillets (p<0.05). In general, It can be concluded that edible coating based on chicken leg gelatin/green walnut skin extract effective to increase shelf- life aquaculture industry.
Volume 21, Issue 156 (February 2025)
Abstract
Current research, has evaluated the efficiency of the membrane process in degumming and neutralization of crude rapeseed oil. Crude rapeseed oil miscellas were prepared using hexane solvent with 20:80 and 30:70 ratios. In order to degumming, the micella passed through the membrane after adding 0.3% of 85% (w/w) phosphoric acid, under three pressure levels of 2, 3, and 4bar and two flow speed of 0.5 and 1m/s; Then, for neutralization, after adding NaOH aqueous solution in two concentrations of 10% and 30% (w/v) the micella passed through the membrane, under the previous conditions, as well as three temperature levels of 30, 40 and 500C. The results showed that for 20:80 micella, the flux gradually decreased with the passage of time and reached a stable state after about 20 minutes. Surveying the simultaneous effect of conditions throught the neutralization process for 20:80 micella, revealed that the highest flux corresponds to 400C, 4bar, 1.0m/s. Surveying the simultaneous effect of temperature, pressure and flow rate throught the neutralization process for 30:70 micella, has also revealed that the highest flux corresponds to 500C, 2bar, and 1.0m/s. The results of the physicochemical tests also revealed that there is no significant difference in the levels of phosphorus and phosphates in both membrane filtration and conventional rifining methods (p<0.01); But acidity reduction for membrane filtration method was significantly higher than that of classical refining method (p<0.01). The reduction of peroxide index was also significantly higher for classic refining method than membrane filtration method (p<0.01). In terms of color, the results showed that the membrane filtration method was not able to reduce the yellow color in crude oil, while the classic refining method significantly reduced the yellow color (p<0.01). The red color index for the classic method also had a significant decrease compared to the membrane method (p<0.01).
Volume 22, Issue 1 (1-2020)
Abstract
Ghee, a nutritional dairy product in Iranian culture, can be easily produced on a small scale. This study was undertaken to analyze fatty acids and volatile compounds of collected ghee samples from different ghee production sites of Iran (Ilam, Kermanshah and Hamedan) using HeadSpace Solid Phase MicroExtraction (HS-SPME) technique. According to the results, palmitic and oleic acids were the dominant fatty acids in all the samples investigated. Further, it might be concluded that compounds such as dodecane, acetone, butyric acid, hexanoic acid, 2-pentanone, 2-heptanone, and 2-undecanone, which are present and might have accumulated as the results of oxidative, hydrolytic, or microbial activities, contribute to the flavor of ghee. Lactones, which are produced at high temperatures, were not collected in any sample except the Hamedan sample (< 1%). Low thermal processing in the ghee production prevented the formation of off-flavor volatile compounds. The qualitative and quantitative parameters determined in this study might be useful in assessing the quality of the ghee and may help the industry to improve its commercial production.
Volume 24, Issue 2 (Summer 2021)
Abstract
Background: Regarding to chronic nature of epilepsy, side effects and resistance to chemical drugs, and with the objective to access to more effective treatment procedures, herbal medicine have received remarkable interest. The aim of this study was to determine the anticonvulsant effects of hydro-alcoholic extract of Cichorium intybus leaves on PTZ-induced seizure in male mice.
Methods: In this experimental study, 56 albino male mice weighing 20-25 g were divided randomly into seven groups. All groups were injected intraperitoneally. The negative and positive control groups received saline (10 ml/1000g) and Phenobarbital (40mg/kg) respectively. Treatment groups received hydro – alcoholic extract of Cichorium intybus leaves at doses of 100, 300, 500, 800 and 1000 mg/kg. All injections were carried out 45 minutes prior to the experiment. In order to provoke convulsion, after 45 minutes pentylenetetrazol (PTZ) was injected (80 mg/kg) to all groups and initiation time of myoclonic and tonic-clonic seizures and percent of 24 h death were measured.
Results: The results indicated that the extract delayed the initiation time of myoclonic and tonic-clonic seizures in comparison with control group. The delay was significant at doses of 1000 and 800 mg/kg (P < 0.001) and 500 mg/kg (P < 0.01) for myoclonic seizure and 1000, 800 and 500 mg/kg (P < 0.001) and 300 mg/kg (P < 0.05) for tonic-clonic seizure. Also, the extract decreased the 24 h death.
Conclusion: It seems the hydro-alcoholic extract of Cichorium intybus have decremental effect on PTZ-induced seizure.
