Sharif Digital Repository

Scale formation is an unpleasant phenomenon that occurs when the mixed fluids are incompatible. The scales damage the reservoir, wellbore and the surface facilities. They reduce the effective fluid path and increase the pressure drop of the system; so it is necessary to study the precipitation thermodynamics of scale formation, and present a trustable method for banning the scales from precipitation. In this project, it has been tried to study the value of precipitated scale due to the mixing of two incompatible waters (Civand and Sea Water). The results of which are compared with the results of a geochemical software named PHREEQC. Then, the performance of hydro chloridric acid as a scale... 

When increased emissions are combined with a carbon tax or emissions trading system, the result is a supply chain with increased costs attributable to the emission generated on the different parts of supply chain. Most traditional supply chain design models do not take emissions and carbon costs into account. Hence, there is a need to incorporate emission costs into a supply chain optimization model to see how the optimal supply chain configuration may be affected by the additional expenses. This thesis presents a mathematical programming model for the design of green supply chains. The costs of carbon dioxide equivalent emissions were incorporated in the objective function, along with the... 

While intrusion detection systems (IDSs) are widely used, large number of alerts as well as high rate of false positive events make such a security mechanism insufficient. Accordingly, a track of recent security research, focused on alert correlation. This thesis proposes a Hidden Markov Model (HMM) based correlation method of intrusion alerts which have been fired from different IDS sensors across an enterprise. We used HMM to predict the next attack class of the intruder that is also known as plan recognition. Our method has two advantages. Firstly, it does not require any usage or modeling of network topology, system vulnerabilities, and system configurations. Secondly, as we perform high... 

Among disasters, outbreaks of pandemics account for excessive human and material damages,including a significant number of deaths. During any pandemic and once an or a set of effective vaccines have been identified/produced, governments all around the world enter a crucial phase when a crucial demand for an effective global vaccination campaign arises to vaccinate the population to stop/avoid the disease, knowing that the vaccines are not immediately available and may even become available with considerable delays (i.e., delivery and validation delays). Therefore, such phase of a pandemic is very crucial to identify and produce effective vaccines as well as to globally and equitably... 

A sustainable supply chain requires constant sustainable changes in the design and performance of its steps. The main characteristic of sustainability is the consideration of social, environmental and economic criteria in strategic and operational decisions. Due to the great importance of the sustainability in transportation network, proper planning and careful design for this issue in recent years has been considered and welcomed by relevant researchers. In this research we want to provide an integrated frame work for transportation network design toward sustainability. In this regard, we also use 3D printing technology as our innovation in operations. Our main issue is the Inventory... 

One of the key challenges and issues in proper supply chain planning is that decision-making in one area affects other areas, and one-dimensional optimization of goals leads to inefficiency in other goals. One of the problems in this field is the realization of a multi-objective model of simultaneous economic and environmental planning in the supply chain. Accordingly, this study aimed to present a multi-objective model of simultaneous economic and environmental programming in the supply chain based on the goal programming of aggregator algorithms. This study is practical in terms of purpose and it is descriptive and developmental in terms of research method. In this way, using two models of... 

Policies affect supply chain management in oil, gas and petrochemical industries. In this study, structural equation modeling was used to evaluate the relationship between variables in AMOS software. The findings also indicated that international policies affect different aspects of supply chain management in the following order: product realization management (coordination), customer delivery management (partnership), planning management (planning) and resource management (implementation). Finally, suggestions were made on how to find financing such as bank loans, prioritizing payments in the light of their criticality, as well as on the creation. This study aimed to investigate the impact... 

Background: Sustainability is one of the most controversial issues in companies’ supply chain these days. Moreover, growing environmental, social, and ethical concerns have scrambled up the push of organizations to adopt sustainable business enforcement into their operations.Purpose: The aim of the study was to examine the current status of sustainability of supply chains and how it is measured. The goal of this study is to answer the research question: How organizations measure their sustainable supply chain performance with Key Performance Indicators? Method: To comprehensively answer the research question, a qualitative research approach was chosen, and the primary empirical data was... 

Organizations in the oil and gas industry often deal with a variety of logistic challenges. These organizations need to utilize innovative technologies like machine learning and other IT-based technologies to reduce costs and help achieve a lower-emissions environment. These industries involve a global supply chain comprised of domestic and international transportation, inventory control, materials handling, import/export facilitation, and information technology. Currently, in these industries, a classic model for executing supply-chain management techniques is considered. However, companies can optimize their supply chains to generate more productivity for better financial returns. Applying... 

Today the environmental management with an emphasis on environmental protection has become one of the most important issues of our customers, governments, industry and competitors and the global and international pressures require the organizations to produce environmentally friendly products and services. This challenge led to the creation of a new concept known as green supply chain management in business areas which is a combination of environmental and supply chain thinking. The aim of this study was to evaluate the performance of green supply chain management using SCOR model and offered suggestions for its improvement and the hypothesis of the proper performance of supply chain... 

Environmental management with emphasis on protecting environment is today one of the most important problems for customers, governments, employees and competitors, and international and global pressures has required organizations to produce environmentally consistent products and services. This challenge has resulted in emergence of a new concept namely green supply change management in the realm of business which is a combination of environmental thinking and supply chain, which will be followed by competitive advantages for firms. This approach has widely attracted the attention of industries, governments and institutions relevant to environment. The aim of this study is to identify main... 

Logistics activities and matters related to supply chain management play an important role in the success of supply chain in today’s competitive business environment. The success of an organization depends on the proper functioning of the whole supply chain organization. SCOR model as a reference model for supply chain management is a suitable framework to manage all aspects of the supply chain and enables the creation of an appropriate and efficient structure in supply chains. In this thesis the Procurement department of a petrochemical company is examined and the current state of the supply chain is explained and then based on the SCOR model, in 4 areas: Performance (indices), Processes,... 

Today competitive business environment has emerged manufacturers and suppliers to take into account specific requirements of customers and end users. Therefore, customers have more important roles in present contexts than what they already had. This significant change led into drastic alteration in the decision-making approaches involved in raw material supply, manufacturing processes, and final product delivery. One of the most influencing decisions in this regard is decoupling point determination in a supply chain. The key role of this point is due to the fact that this pint location affects almost all decisions being made in different stages of the chain. This thesis addresses factors... 

With the decline in oil discoveries during the last decades, it is believed that enhanced oil recovery (EOR) technologies will play a key role to meet the energy demand in coming years. Polymer flooding has been commonly used worldwide as one of the EOR processes. Literature reviews show that the active water-soluble polymers have a number of limitations related to their surface absorption, undesirable plugging, polymer concentration limitation,expensive, and low thermal, mechanical, bacterial, and salt tolerance. Up to now, five different polymer categories (i.e. polyacrylamide, hydrolyzed polyacrylamide, acrylamidebased resistant copolymers, associative copolymers, and thermoassociative... 

Among the equipment used in supermarkets, refrigeration systems should be the focus of energy efficiency initiatives; Because they are the biggest consumers of energy and refrigerant with significant maintenance costs. Fault detection and diagnosis (FDD) can provide considerable potential for energy savings as well as reduced maintenance costs. Although there have been numerous investigations of FDD for HVAC systems, there has been very little research on the application of FDD for supermarket refrigeration systems. Therefore, this thesis focuses on the application of FDD to these systems and helps to fill these research gaps. The studied system is a commercial refrigerator system on a... 

Iran has many fossil fuels resources and today due to several reasons such as the environmental effects caused by burning these fuels, the depletion of fossil resources and energy security, the pattern of fuel production and consumption has changed.In recent years biofuels received the attention of researchers all over the world due to the sustainability of energy supply and their positive environmental effects. The agricultural wastes and Residues may be used to produce biofuels. Qazvin province, with its high potential of agriculture, can provide many sources of agricultural waste and residues for the production of biofuels. In this research, the aim is to optimize the biofuels supply... 

The importance of optimizing the extraction process of available resources increases each day due to the increasing energy consumption and the lack of energy resources. Oil and gas are one of the most important sources of energy. Although existing oil and gas resources are thought to be sufficient to meet the growing energy demand for the next few decades, given the non-renewable nature of these resources and the growing demand for oil and gas, it will become much harder to meet the future energy demand. Many existing oil fields are now in the process of maturing, and the discovery of large new oil fields is rare. As a result, new technologies must be used in the future to meet this demand,... 

The Oil and gas industry is one of the most important industries in the world. It has great role in Iran’s economy also. Regarding complexities of new companies, there is room for more cooperation and coordination within the industry and with other actors. Oil and gas niches have close interdependency with financial sector. The new encrypted currencies play great role in new financial models. Blockchain technology can help the oil and gas industry by using its appropriate features. Blockchain is a system of recording information in a way that makes it difficult or impossible to change, hack, or cheat the system. The supply chain of oil and gas industry in Iran includes upstream, midstream... 

Clean and Renewable energies are one of the most important part of global policy. In order to reduce greenhouse gas emissions mostly from fossil fuels, many countries have introduced biofuels to avoid depletion of fossil fuels and decrease the pollution. In Iran, large dependency on crude oil and natural gas resources cause barriers for utilization of biofuels. The country has plenty of biomass resources that may guide national decision makers toward biofuels.In this study, biomass supply chain to produce biofuel is studied to reach sustainability. The model enables us to depict the optimal path to reach the economic, environmental, and social sustainability through the whole supply chain.... 

Localization of a neutron point source using a designed computer program namely “MCMC-MATURE” is performed. The computer program analyses several detector responses in some certain media by Markov Chain Monte Carlo (MCMC) method and a new iteration algorithm. Identification of the possible regions of source position would be found by analyzing the initial fluxes generated by mesh tally of MCNPX computer code. The designed computer program is capable to generate the flux between detectors. “Regular-Sequential”, “Irregular-Sequential” and “Non-Sequential” are three methods used for sampling the generated random number in two dimensions. Each sample multiplied by a sampling function and lead to...