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Dalvi M.,Islamic Azad University at Ardestan | Hamdami N.,Isfahan University of Technology
Journal of Agricultural Science and Technology | Year: 2011

Information on the thermophysical properties of the Iranian ultrafiltrated (UF) white cheese is very limited. In this research, those thermal properties determined experimentally were thermal conductivity, specific heat, density and water activity. The thermal conductivity and specific heat of Iranian ultrafiltrated white cheese (IUFWC) ranged from 0.447 to 0.480 W m-1 °C-1 and from 3.871 to 4.005 kJ kg-1 °C-1 for temperatures varying from 1°C to 23°C and from 1°C to 40°C, respectively. Both thermal conductivity and specific heat increased with moisture content and temperature. A three-step model predicting thermal conductivity as a function of cheese composition and temperature was developed based on the parallel and Maxwell models. The effective thermal conductivity predicted by the model developed was in good agreement with the experimental data. The modeling of density and water activity using non-linear regression concepts showed that density was highly affected by salt concentration and temperature; water activity was also strongly dependent on salt concentration and moisture content.


Hekmatpanah M.,Islamic Azad University at Ardestan
World Academy of Science, Engineering and Technology | Year: 2011

The manufacturing is currently being used as a continuous quality improvement tool, providing a planning, implementing, monitoring and evaluating framework for the quality improvement measures on a sustainable basis. An causeand-effect diagram, also known as a Ishikawa diagram or fishbone diagram, is often used in quality management in manufacturing Industries. Fishbone diagram (also known as Ishikawa diagram) was created with the goal of identifying and grouping the causes which generate a quality problem. Gradually, the method has been used also to group in categories the causes of other types of problems which an organization confronts with. This made Fishbone diagram become a very useful instrument in risk identification stage. In this paper, with using the six sigma technique and cause-and-effect diagram is used to demonstrate how to relate potential causes of a major presenting problem in Sepahan oil company. For this purpose, the four liter production line of the company has been selected for investigation. The findings imply that the application of cause-and-effect diagram has reduced the scraps from 50000 to 5000 ppm and has resulted in a 0.92% decrease of the oil waste.


Emadi J.,Islamic Azad University at Ardestan | Hashemi S.H.,Arak University
World Academy of Science, Engineering and Technology | Year: 2011

The use of fiber reinforced plastics (FRP) in repairing and strengthening RC beams has been researched in recent years. In particular, attaching unidirectional FRP to the tension face of RC beams has provided an increase in stiffness and load capacity of the structure. However, due to the brittle nature of unidirectional FRP, the ductility of the beam decreases. Consequently, the safety of the structure is compromised due to the reduction in ductility. The purpose of this research is to investigate the behavior of high strength reinforced concrete beams strengthened with FRP sheets. The major test variables were included the different layouts of CFRP sheets and tensile reinforcement ratio. More particularly, the change in strength and ductility of the beams as the number of FRP layers and tensile reinforcement bar ratio are altered is investigated. Six underreinforced concrete beams were fabricated and tested to failure. With the exception of the control beam, one or four layers of CFRP were applied to the specimens.


Nasri M.,Islamic Azad University at Ardestan | Sardoo F.S.,Jiroft University
World Academy of Science, Engineering and Technology | Year: 2011

Flood is a natural demolishing phenomenon, forecast of which is of high importance. Estimation of rainfall-runoff and flood is a difficult task due to influence of different factors. So far, different methods have been proposed to analyze such phenomena. This study was conducted in the basin of Sheikh Bahaei Dam in Isfahan Province to prioritize areas influencing the flood peak discharge or in other words, to specify areas with highest flood potential. HEC-HMS hydrological model was used to simulate the flow in the hydrological units of the area. The results showed that areas near the output point of the basin play the highest role in flood development and should be placed in the first priority of watershed management. The results can remarkably contribute to the monitoring system of the area.


Hekmatpanah M.,Islamic Azad University at Ardestan
World Academy of Science, Engineering and Technology | Year: 2011

Since the beginning of human history, human activities have caused many changes in the environment. Today, a particular attention should be paid to gaining knowledge about water quality of wetlands which are pristine natural environments rich in genetic reserves. If qualitative conditions of industrial areas (in terms of both physicochemical and biological conditions) are not addressed properly, they could cause disruption in natural ecosystems, especially in rivers. With regards to the quality of water resources, determination of pollutant sources plays a pivotal role in engineering projects as well as designing water quality control systems. Thus, using different methods such as flow duration curves, dischargepollution load model and frequency analysis by HYFA software package, risk of various industrial pollutants in international and ecologically important Gavkhoni wetland is analyzed. In this study, a station located at Varzaneh City is used as the last station on Zayanderud River, from where the river water is discharged into the wetland. Results showed that elements' concentrations often exceeded the allowed level and river water can endanger regional ecosystem. In addition, if the river discharge is managed on Q25 basis, this basis can lower concentrations of elements, keeping them within the normal level.

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