Original Article
Studies in Social Science
Alireza Bozorgian
Abstract
The high capacity of gas hydrate in natural gas storage makes it attractive to use it for storage and transportation of natural gas and other gases as a competitor to liquefaction and condensation methods. Since the 1960s, when gas hydrate was introduced as a disturbing factor in gas pipelines, the idea ...
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The high capacity of gas hydrate in natural gas storage makes it attractive to use it for storage and transportation of natural gas and other gases as a competitor to liquefaction and condensation methods. Since the 1960s, when gas hydrate was introduced as a disturbing factor in gas pipelines, the idea of natural gas transfer by hydrate has been on the minds of many scientists. Because the hydrate transport temperature is higher than the liquefied natural gas (LNG) transport temperature, gaseous hydrate can be easily transported; Therefore, the technology of building hydraulic vessels will be much less complex than that of LNG vessels, and hydrogen production facilities can be designed much easier than LNG facilities. But the main problem is the smaller volume of gas transferred. According to studies in this field, each cubic meter of hydrate contains 175 cubic meters of gas. However, in LNG technology, the volume reduction reaches one hundred percent, and this issue is very important in the economics of gas transmission projects, especially long distances. Nevertheless, there is still great hope that hydrate will be used as a completely economical solution for gas transmission. In this regard, British Petroleum, in collaboration with other scientific centers such as the University of Gwasen, is building a small industrial unit that can produce 100 kg of hydrate per day.
Original Article
Studies in Social Science
Masoud Bagherisadr; Alireza Bozorgian
Abstract
In general, a gas hydrate is a combination of gas and water. For example, a group of mineral compounds are called solid hydrates. These are ionic solids that ions are surrounded by water molecules and make crystalline solids. In any case, in the gas industry, hydrates are a combination of a small molecule ...
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In general, a gas hydrate is a combination of gas and water. For example, a group of mineral compounds are called solid hydrates. These are ionic solids that ions are surrounded by water molecules and make crystalline solids. In any case, in the gas industry, hydrates are a combination of a small molecule of gas and water. During the nineteenth century, hydrates remained an unknown and controversial topic. Early efforts were focused on understanding what compounds make up hydrates and under what conditions they form. During this period, many the constituents of hydrates were discovered. But it was not until the twentieth century that the industrial importance of gaseous hydrates proved. In the oil industry, the term gas hydrate refers to compounds that are usually gaseous at room temperature. These include methane, ethane, carbon dioxide, hydrogen sulfide, etc., and this leads to the term hydrogen and at the same time one of the most common misconceptions about these compounds. Obstruction does not cause much of a problem during normal pipeline operation. However, our unforeseen problems such as pump failure or obstruction problems in the transmission cause hydration and thus blockage of pipelines. It takes several weeks to remove these contractions. The purpose of this work is to investigate the phenomenon of hydrate decomposition in pipelines. A model has been discovered that is similar to the decomposition of hydrates in pipelines. The purpose of this work is to develop an optimal strategy for dehydration in pipelines with bilateral contraction.
Original Article
Studies in Social Science
Yosra Raziani; Sheno Raziani
Abstract
Today, the number of obese people is increasing, and this problem, which in the recent past was considered a problem of developed and industrialized countries. It is now on the rise all over the world, including in developing countries, where food shortages are often the main nutritional problem. In ...
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Today, the number of obese people is increasing, and this problem, which in the recent past was considered a problem of developed and industrialized countries. It is now on the rise all over the world, including in developing countries, where food shortages are often the main nutritional problem. In addition, reducing the age of obesity and its prevalence in children and adolescents is also very important, because obesity at this age has a greater impact on health. In many cases, adult obesity begins in childhood, and effective prevention depends on how to deal with and control childhood obesity. Obesity in childhood and adolescence, especially during the second decade of life, is a strong predictor of adult obesity. The prevalence of obesity among children and adolescents is increasing in many countries around the world, even in countries where malnutrition due to malnutrition is still a public health problem. Accordingly, there is a close relationship between childhood obesity and the increased risk of adult obesity and the resulting physical problems. Today, overweight and obesity is a chronic disease that has become a health problem. It is one of the most serious public health challenges of the 21st century. According to the World Health Organization, 30% of the Middle East population is overweight. Today, overweight in children has become an epidemic, and in the age group of 6-12 years, overweight has more than doubled in the last decade.
Original Article
Studies in Social Science
Rozita Kaviani
Abstract
< p>Underground gas reserves in the form of hydrates are a huge source of energy that researchers are looking for ways to extract. The amount of hydrate gas reserves is estimated at more than 1016 cubic meters, which is more than the discovered sources of other fossil fuels, if only 15% of this ...
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< p>Underground gas reserves in the form of hydrates are a huge source of energy that researchers are looking for ways to extract. The amount of hydrate gas reserves is estimated at more than 1016 cubic meters, which is more than the discovered sources of other fossil fuels, if only 15% of this gas is extracted. But due to problems such as the slow rate of hydrate formation and the high pressure of its formation, his idea remained in the laboratory. After the discovery of hydrate self-preservation, this idea was raised more seriously and a lot of research was done on the use of hydrate for gas storage and transmission. High gas pressure is the most important negative factor in mass production of hydrates for gas storage and transport. The results showed that using these materials, methane hydrate is formed in much more suitable conditions than temperature and pressure. While the equilibrium pressure of methane hydrate formation at 293 ° K is about 34 MPa, with the addition of tetra-hydro-furan at a concentration of 2.5 mol%, this pressure is reduced to about 2.49 MPa, which shows a decrease of 92.6%. Also, at a pressure of 5 MPa, the equilibrium temperature of methane hydrate is about 278 degrees Kelvin, while at the same pressure, the fuzzy equilibrium temperature of a 6 mol solution of tetra-hydro-furan was about 306 degrees Kelvin.
Original Article
Studies in Social Science
Rohollah Mohammadian
Abstract
Drilling mud is one of the most important components of rotary drilling, without which drilling is almost impossible. Drilling mud has many functions and applications, including cleaning the bottom of wells and transporting drilled debris to the ground, drying and lubrication of drilling tools such as ...
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Drilling mud is one of the most important components of rotary drilling, without which drilling is almost impossible. Drilling mud has many functions and applications, including cleaning the bottom of wells and transporting drilled debris to the ground, drying and lubrication of drilling tools such as drills, weight pipes and maintenance drilling pipes. From the wall of the well and create an impenetrable layer for the wall to prevent the entry of pressurized floors into the well to prevent the deposition of particles and weight-increasing materials of the drilling mud, while the drilling mud is stationary. Separation of drilled material after reaching the ground level Weight reduction of weight pipes, drill pipes and wall pipes according to Archimedes' law pointed to the hydraulic power of mud pumps to the drill. In this project, the goal is optimal hydraulic design for drilling mud. Due to the fact that in the optimal hydraulic design of drilling mud, the maximum hydraulic power and pump outlet pressure and well geometry are among the limitations, so the only parameters that can be used in the design are adjusting the pump outlet rate and size and number of drill nozzles. In this research, it was tried to design the optimal output rate as well as the number and size of drill nozzles to reduce the pressure drop and increase the hydraulic power of the pump.
Original Article
Studies in Social Science
Frank Rebout; Rozita Kaviani
Abstract
Nowadays, scientists in physics, materials, etc. have come to the conclusion that if materials can be prepared in smaller proportions, the bonds that a small material makes with its surrounding phases are much stronger than larger scales. Nanocomposites were produced. In this type of composite material, ...
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Nowadays, scientists in physics, materials, etc. have come to the conclusion that if materials can be prepared in smaller proportions, the bonds that a small material makes with its surrounding phases are much stronger than larger scales. Nanocomposites were produced. In this type of composite material, at least one of the phases of the composite material is in nanometer dimensions. In the discussion of nanomaterials, nanocomposites have a special place. These materials have two or more nanometer components. The presence of particles and fibers in the structure usually creates strength in the substrate. In fact, when particles or fibers are distributed within a substrate, the forces applied to the composite are uniformly transmitted to the particles or fibers. Particles or fibers that are distributed within a substrate are called fillers. Properties such as strength, hardness, physiological properties, and porosity change with the distribution of fillers within the substrate. The substrate can hold the particles apart in such a way that crack growth is delayed. In other words, with proper distribution of fillers in the background material, the crack growth path in the background becomes longer and therefore crack growth is delayed. In addition, the components of nanocomposites have better properties due to the surface interaction between the substrate and the filler. The type and amount of these interactions play an important role in the various properties of nanocomposites such as solubility, optical properties, electrical and mechanical properties.
Original Article
Studies in Social Science
Amarjit Singh; Abhijeet Mishra
Abstract
Rickshaw pullers are one of the basic wellsprings of public transportation in metropolitan zonesthat furnish us with last mile availability. Other than fulfilling the expanding need for a powerfulmethods for intra-metropolitan versatility, rickshaws have thrived in Indian urban communitieson account ...
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Rickshaw pullers are one of the basic wellsprings of public transportation in metropolitan zonesthat furnish us with last mile availability. Other than fulfilling the expanding need for a powerfulmethods for intra-metropolitan versatility, rickshaws have thrived in Indian urban communitieson account of the migration of provincial rural populaces without critical training and capital intourban areas looking for occupations, for whom rickshaw pulling is the best accessible alternativebecause of its simplicity of passage. An extensive extent of metropolitan poor are reliant onrickshaws as a significant wellspring of work in India. This work is an endeavor to comprehendthe patterns constantly in migration of rickshaw pullers in Delhi. The examination center aroundthe financial status of rickshaw pullers in Delhi and back home, the spot of having a place andthe explanations behind migration and how has migration achieved an adjustment in their lives inthe event that it has by any stretch of the imagination. The investigation needs in survey,interviews, interactions alongside auxiliary wellsprings of information, for example, governmentrecords if any accessible. The investigation was completed in various areas in Delhi, forexample, metro stations, commercial centers and so forth. In this examination both qualitativejust as quantitative information has been utilized for itemized investigation of the did exercises.
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