Original Article
Chemical Engineering
Kim Lo Han
Abstract
Network methods are one of the most widely used groundwater modeling tools that have become widespread and popular over the last two decades. In this research, with a new approach to network methods, these methods are introduced as a numerical model to simulate the movement of groundwater. With the development ...
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Network methods are one of the most widely used groundwater modeling tools that have become widespread and popular over the last two decades. In this research, with a new approach to network methods, these methods are introduced as a numerical model to simulate the movement of groundwater. With the development of this network model, a non-systematic model has been proposed to solve the flow in an arbitrary network. Although many of these problems occur on the surface of the earth, these pollutants enter groundwater after penetrating the earth. After joining the groundwater, these pollutants are transferred by moving groundwater and reach rivers, lakes and wells. On the other hand, the limited groundwater has made the groundwater increasingly important as a source of human drinking water. One of the first steps required to estimate the behavior of groundwater is to find a mathematical model that the application of these models in turn requires the collection of information. By using experimental systems, the cause of errors caused by human error or human ignorance can be greatly reduced and eliminated. For this reason, many studies have been done on issues such as maintenance of a wellhead, design of drinking water supply systems, estimation of movement and transfer of pollutants in the aquifer, etc., and mathematical models for these problems have been presented.
Original Article
Chemical Engineering
Martin Zbuzant
Abstract
According to international standards, sulfur in fuels used in the transportation industry, as one of the most important polluting industries, should be reduced to around 10 ppmw, while many refineries around the world produce sulfur fuels with more than 1000 ppmw. One of the new and cost-effective methods ...
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According to international standards, sulfur in fuels used in the transportation industry, as one of the most important polluting industries, should be reduced to around 10 ppmw, while many refineries around the world produce sulfur fuels with more than 1000 ppmw. One of the new and cost-effective methods of reducing sulfur among all existing methods is photocatalytic oxidation methods. Another advantage of designed catalysts is that while they are used in the desulfurization process, the oxidation and adsorption processes take place rather than in separate steps (which in turn increases cost and time), due to the structural properties of this. The catalyst of both phases takes place simultaneously and simultaneously during one phase. In reactor experiments, the oxidative desulfurization (ODS) process of model diesel fuel, including the resistant compound of d-benzothiophene in n-shop solvent with 100 ppmw sulfur, was performed under mild operating conditions such as ambient temperature and pressure without hydrogen and the effect of operating parameters such as catalyst mass. Amount and concentration of H2O2 oxidant, type and amount of light radiation, amount of dopant and type of catalyst on the percentage of conversion of sulfur compounds and in other words on the efficiency of the study process and showed that increasing the amount of catalyst, amount and concentration of auxiliary oxidant and the amount of dopant to Certain will increase the efficiency and more than that will reduce the efficiency of the desulfurization process.
Original Article
Chemical Engineering
Frank Rebout
Abstract
There are many ways to reduce the coefficient of friction as a result of pressure drop in internal flows and thrust force in external flows. For example, film suction, injection of gas bubbles in the boundary layer, use of magnetic fluid, etc., which are mostly intermediate fluids. Polymers are among ...
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There are many ways to reduce the coefficient of friction as a result of pressure drop in internal flows and thrust force in external flows. For example, film suction, injection of gas bubbles in the boundary layer, use of magnetic fluid, etc., which are mostly intermediate fluids. Polymers are among the materials that can be used as intermediate fluids. Due to their ring structure and chain structure, polymer particles stretch and elongate when they are inside the stream. This stretching first absorbs energy from the fluid and does not allow this energy to be used to produce vortices. Second, stretching the polymer chain like a wall prevents the growth of vortices. The higher the molecular mass of the polymer, the greater the drop loss and the lower the critical concentration due to the heavier the polymer. As the concentration of polymer in water increases, the drop curve in terms of discharge towards the horizontal axis of Shifa and gets closer to it. In other words, the friction drops decreases. Percentage drop for 100gr per cubic meter of water is 4.54%, 200gr per cubic meter is 12.78%, 300gr per cubic meter is 27%, 400gr per cubic meter is 30.7% and 500gr per cubic meter is 39.4%, the maximum amount of reduction is.
Original Article
Medicine
Ebrahim Ghaibi; Mohammad Reza Soltani Manesh; Hadis Jafari Dezfouli; Farzaneh Zarif; Zahra Jafari; Zahra Gilani
Abstract
AbstractThe purpose of the present study was to compare marital satisfaction, emotional divorce and religious commitment among nurses and staff of public hospitals in Ahvaz. The sample consisted of nine nurses and staff of public hospitals in the community who were selected by the available sampling ...
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AbstractThe purpose of the present study was to compare marital satisfaction, emotional divorce and religious commitment among nurses and staff of public hospitals in Ahvaz. The sample consisted of nine nurses and staff of public hospitals in the community who were selected by the available sampling method. The tools used in this study were Alason's Marital Satisfaction Questionnaire, Emotional Divorce of Razghi et al. and Barati's religious commitment. This research is comparative. The findings showed that employees have more marital satisfaction than nurses, given the average of the two groups. Due to the average of the two groups of nurses and public hospitals employees, they are in the same way in terms of emotional divorce. Given the average of the two groups of nurses, they have a higher religious commitment than employees.
Original Article
Chemistry
Seyedeh Shahrzad Moayeripour
Abstract
Environmental impact assessment is considered as a tool for environmental planning and management of development projects. There are several methods of environmental impact assessment. To choose the right method for each project, one should pay attention to a set of conditions and characteristics such ...
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Environmental impact assessment is considered as a tool for environmental planning and management of development projects. There are several methods of environmental impact assessment. To choose the right method for each project, one should pay attention to a set of conditions and characteristics such as method specifications, environment characteristics, and the nature of the project. The purpose of environmental impact assessment is to identify and systematically value the potential effects of projects, programs, plans, policies and laws on the physical, chemical, biological, cultural, economic and social components of the environment. The first goal of environmental impact assessment is to encourage planners and decision makers to look at and pay attention to the environment and ultimately succeed in taking actions that are compatible with the environment. Environmental impact assessment is actually a process that includes detection, prediction, assessment and mitigation of biophysical, social and other similar effects from developments proposed by decision makers and commissions. This process is designed to ensure that the impacts of the developments are well understood and accounted for before they are implemented. This assessment causes all the effects and environmental consequences to be considered by weight or other economic and social effects during the implementation of development plans. If this stage is done well, its profit will be determined in the same planning stage.