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    Assessment of Greenhouse Gas Mitigation Potential from Energy System

    , M.Sc. Thesis Sharif University of Technology Talaei, Alireza (Author) ; Soltanieh, Mohammad (Supervisor) ; Saboohi, Yadollah (Supervisor)
    Globally energy system is the main source of green house gas emission. 60-90 percent of manmade CO2 is due to energy sector. Pollutants like NOx, CO, Non Methane Hydrocarbons which may cause indirect effect on climate system are mainly emitting from energy sector. Gas, Oil and Coal extraction and transmission are responsible for more than 15% of Methane emission globally. Therefore it is important to consider all types of GHGs emission as well as all sectors of energy system to assess the GHGs mitigation potential throughout the energy system. Considering the significance of energy sector in GHGs emission, in this study we developed an optimized model for Iran’s energy sector in which we ran... 

    Multi-objective optimization approach for green design of methanol plant based on CO2-efficeincy indicator

    , Article Journal of Cleaner Production ; 2014 ; ISSN: 09596526 Taghdisian, H ; Pishvaie, M. R ; Farhadi, F ; Sharif University of Technology
    The aim of the present work is to propose an eco-design method for sustainable development of methanol production by implementing a multi-objective optimization model based on CO2-efficiency. Two different approaches for the methanol production, i.e. a conventional reference methanol case (RMC) and proposed green integrated methanol case (GIMC) were compared from the view point of eco-design. Using life cycle assessment and process simulation, the environmental features as well as operational decision variables of the RMC and GIMC were assessed. Based on the inventory analysis of LCA, it was found that carbon dioxide is the major emitted pollutant from methanol production. Thus the... 

    Simulation of ventilation effects on indoor radon

    , Article Management of Environmental Quality ; Volume 24, Issue 3 , 2013 , Pages 394-407 ; 14777835 (ISSN) Akbari, K ; Mahmoudi, J ; Ghanbari, M ; Sharif University of Technology
    Purpose: The purpose of this paper is to describe the use of computational fluid dynamics (CFD) to simulate indoor radon distribution and ventilation effects. This technique was used to predict and visualize radon content and indoor air quality in a one-family detached house in Stockholm. The effects of intake fans, exhaust fans and doors on radon concentration were investigated. Design/methodology/approach: In this study a mechanically balanced ventilation system and a continuous radon monitor (CRM) were used to measure the indoor ventilation rate and radon levels. In a numerical approach, the FLUENT CFD package was used to simulate radon entry into the building and ventilation effects.... 

    A novel method for mitigation of asphaltene deposition in the wellstring

    , Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 29, Issue 2 , 2010 , Pages 131-142 ; 10219986 (ISSN) Soltani Soulgani, B ; Rashtchian, D ; Tohidi, B ; Jamialahmadi, M ; Sharif University of Technology
    Asphaltene precipitation and deposition is a serious problem in many Iranian fields. The deposited asphaltene results in partial or total blockage of the wellbore and wellstring reducing or completely seizing oil production. This paper studies the asphaltene problem and mitigation methods in wellstring systematically. It presents new approach based on the combination of thermodynamic modeling of asphaltene precipitation with hydrodynamic well modeling. The developed model is capable to determine the asphaltene precipitation and deposition interval through the wellstring. Therefore, it could study the effect of hydrodynamic parameters such as wellhead pressure, well flow-rate and tubing size... 

    Mitigation of ac voltage occurring in pipeline located closed to electric transmission lines with design of joint right of way

    , Article 5th IFAC Symposium on Power Plants and Power Systems Control 2003, 15 September 2003 through 19 September 2003 ; Volume 36, Issue 20 , 2003 , Pages 1151-1154 ; 14746670 (ISSN) Kumleh, B. P ; Varahram, M. H ; Kumleh, S. P ; Sharif University of Technology
    IFAC Secretariat  2003
    In joint-use corridors where both pipelines and AC electric transmission lines are present, a portion of the energy contained in the electromagnetic field surrounding the electric transmission lines is captured by each pipeline, resulting in induced AC voltages. In this paper a joint power line/pipeline Right ofWay is designed. Suitable single and double circuit configuration of overhead transmission line or suitable distance of buried pipelines from center electric power lines for mitigation of buried pipeline voltage due to AC Inductive Coupling is introduced and discussed. Copyright © 2003 IFAC  

    Defining mitigation strategies for recurring EPC contract risks

    , Article Construction Research Congress 2016: Old and New Construction Technologies Converge in Historic San Juan, CRC 2016, 31 May 2016 through 2 June 2016 ; 2016 , Pages 2773-2782 ; 9780784479827 (ISBN) Sadeghi, B ; Mortaheb, M. M ; Kashani, H ; Sharif University of Technology
    American Society of Civil Engineers (ASCE) 
    Engineering, procurement and construction (EPC) contracts are commonly used for the construction of oil and gas production facilities. These projects are subjected to many uncertainties. EPC contractors often assume most of the project risks. Several studies have focused on the identification and analysis of EPC project risks. However, they generally fail to define appropriate and effective risk management strategies. The objective of this study is to define efficient risk mitigation strategies that can be utilized in EPC oil and gas projects. A comprehensive review of literature was conducted to identify the risks in EPC projects. Experts' opinion were used to analyze and categorize these... 

    Isolation System for Mitigation OF VertIcal Seismic Waves Effects

    , M.Sc. Thesis Sharif University of Technology Sarraf, Samyar (Author) ; Dolatshahi, Kiarash (Supervisor) ; Rafiee Dehkharghani, Reza (Co-Advisor)
    The main goal of partake quake-attenuating in buildings is to absorb energy and to attenuate the exerted forces into structures as a result of ground motions. Notwithstanding achievements and developments in the field of dampers production, applying of dampers in structures is proportional to following complicated technology and subtle engineering. Installation and initiation of dampers depend on educated and expert crew; moreover, such attenuating systems need maintenance and repair during the useful structural life time. Therefore, nowadays civil engineering suffers from the lack of such quake-attenuating systems to be able to respond simply but applicable mechanism at the same time for... 

    Emission Mitigation Strategies for Combustion Sources

    , M.Sc. Thesis Sharif University of Technology Naseri, Kasra (Author) ; Arhami, Mohammad (Supervisor) ; Abrishamchi, Ahmad (Co-Supervisor) ; Azarmi, Farhad (Co-Supervisor)
    Scientific studies, conducted over the world, show that an immense portion of pollutants and greenhouse gases emission to the atmosphere are the direct result of the incineration of fossil fuels in industrial units. These industrial units include chemical industries, power plants, metal industry, etc. Therefore, there is a tremendous necessity to reduce the pollutants emission from these industries immediately and effectively. Meanwhile, in order to mitigate the emission to the atmosphere, there should be a meticulous estimation of pollutants emission from various sources. Hence, in a project called "standardization of emission of pollutants from diverse industrial units in Iran", the... 

    Through Silicon Via (TSV) to Transistor Noise Coupling Characterization

    , M.Sc. Thesis Sharif University of Technology Amiri, Sajjad (Author) ; Sarvari, Reza (Supervisor)
    Due to the physical limitations of the conventional 2D ICs at Giga-Scale Integration, modern technologies have been emerged. Among them, through silicon via (TSV) - based 3D ICs have been used to continue Moore’s law in the interconnect era. In these systems, dies are stacked at z-direction after wafer thinning. Electrical connections between stacked dies are done by TSVs. One important advantage of 3D integration technology is their ability to stack heterogeneous systems with different technologies on a single chip. This will not only increase interconnect density but also will reduce the delay and power consumption. However, nowadays, fabrication and optimum design of TSVs are still big... 

    Development of an Analytical Framework for Evaluation of Climate Change Mitigation Policies on Iran’s Energy Security

    , M.Sc. Thesis Sharif University of Technology Eshraghi, Hadi (Author) ; Maleki, Abbas (Supervisor)
    Climate change and energy security are key drivers for future energy policy. While energy security has been a pillar of energy policy for about a century, concern about climate change is more recent and is bound to radically change the landscape of energy policy. Policy makers are now under increasing pressure to address these twin challenges: to develop cost-effective policies that will both ensure the security of our energy system and reduce greenhouse gas emissions.
    Main Effort in this Project is to construct an integrated model of Iran’s energy system to serve as a policy analysis tool, by which policymakers are able to identify the future effects of a wide range of policies in... 

    An Investigation on the Effects of Liquefaction Induced Lateral Spreading on Deep Foundations and Development of Mitigation Measures Using 1g Shake Table Tests

    , Ph.D. Dissertation Sharif University of Technology Kavand, Ali (Author) ; Haeri, Mohsen (Supervisor) ; Rahmani, Iraj (Co-Advisor)
    Liquefaction induced lateral spreading is defined as the lateral displacement of mildly sloping grounds or those ending in free faces as a result of liquefaction in subsurface soil layers. Damages imposed by lateral spreading on pile foundations supporting different types of structures such as ports, bridges and buildings are usually observed in large earthquakes. These potential damages are of high degree of importance in southern and northern coastal areas of Iran where several ports and critical facilities are located. River banks all over the country where bridge piers exist are also among the areas prone to potential damages. Evaluation of the effects of lateral spreading on existing... 

    CFD Modeling for Mitigation of Heavy Toxic Gas Release

    , M.Sc. Thesis Sharif University of Technology Miri Ramsheh, Saeed (Author) ; Rashtchian, Davoud (Supervisor)
    The release of toxic materials causes tragic accidents every year. There are various techniques in order to mitigate the release effect of these materials such as Application of air jets, steam curtains and water curtains. In this study first, previous works are reviewed in order to select the best technique for the mitigation of heavy toxic gas release. Then CFD modeling is used to simulate this technique.
    A field situation in which chlorine gas was released upwind of water spray was simulated using the open-source software FDS (Fire Dynamic Simulator), a CFD model. Only mechanical effects of water sprays are considered; hence the effect of absorbtion is neglected. Finally tha... 

    in Partial Fulfilment of the Requirements for the Degree of Master of Engineering Faculty of Civil Engineering, Department of Water and Environmental Engineering Sharif University of Technology

    , M.Sc. Thesis Sharif University of Technology Rezaee, Ehsan (Author) ; Arhami, Mohammad (Supervisor) ; Abrishamchi, Ahmad (Co-Advisor)
    Oil and gas industries are always considered as one of the most polluting industries in the world. Many pollutants are emitted from the industry into the environment every year. Equipment’s leak and flaring off additional gases produced by various processes of oil and gas production are the main sources of waste in these industries. In order to control these hazardous wastes, it is necessary to provide effective solutions and make appropriate decisions so policymakers will be able to implement policies in order to reduce the emissions of air pollutants. In order to reduce the emissions, it is necessary to conduct the correct and reliable methods and have sufficient information about the... 

    Fake News Spreading Mitigation Via Tracing Information In Social Networks

    , M.Sc. Thesis Sharif University of Technology Rafiei, Mina (Author) ; Rabiee, Hamid Reza (Supervisor)
    Expansion of using social networks for reading and sharing news on the one hand, allows for quick and easy access to the news, but on the other hand, increases the spread of fake news and misleads many users. Therefore, identifying the fake news and attempting to mitigate its spreading on social networks is one of the major research areas in recent years. An important issue in this regard is reducing the time gap between news release time and identifying it as fake and starting to take action. Many researches has been done on detection of fake news, but since there is a trade-off between minimizing the time gap and maximizing accuracy, work on these models continues. There are also different... 

    The Effect of Fence to Dilute the Dense Gas Dispersion Using CFD Model

    , M.Sc. Thesis Sharif University of Technology Maroofi, Jooya (Author) ; Rashtchian, Davood (Supervisor)
    Release of toxic gases and hazardous materials is very dangerous for health of people that presence in near of release places. Whereas if the concentration of some toxic materials is more than a definite limit, it may cause of irreparable hurt to health of people in very short times, hence reduce the concentration of released materials can get the time for refuge in safe sites for people that presence in released site in initial times.
    In this paper with use the Computational Fluid Dynamics models the effect of fence in reduce the concentration of dense gases and delay the distribution of these gases has been studied. The two toxic gas (chlorine and methyl-isocyanate ) have been... 

    An Economic-Financial Model for Response to Earthquake in Conditions of Uncertainty with a Case Study of an Earthquake Event in a Small Town

    , M.Sc. Thesis Sharif University of Technology Bostanara, Maryam (Author) ; Eshghi, Kourosh (Supervisor)
    Annually Natural disasters make tremendous impacts on societies. Fatality rate of earthquake in Iran is almost more than all other disasters. There are numerous problems in disaster Management's of Iran and other countries. One of the disaster Management's phases is response phase which mostly depends on emergency processes, so most of papers working on this phase, plan for emergency state by using different techniques.All the studies seeking the response phase, try to reduce the loss of disaster by the use of immediate response to earthquake, pointing the disaster after occurrence. But Another point of view is to make loss reduction by precautious activities and plans. Actually, the loss... 

    Crosstalk Fault Modeling and Mitigation in System-on-Chips

    , M.Sc. Thesis Sharif University of Technology Shafaei Moghaddam, Mansour (Author) ; Miremadi, Ghassem (Supervisor)
    Use of nano-scale VLSI technologies in the fabrication of System-on-Chips (SoCs) makes reliability as one of the major issues in the design and implementation of these products. SoCs are susceptible to several fault sources such as crosstalks, cosmic particle strikes, electromagnetic interferences, and power supply disturbances. Among the mentioned fault sources, crosstalks have the major contribution in threatening the reliability of SoCs. This thesis addresses the modeling and mitigation of crosstalk faults. In this regard, two analytical models and three crosstalk reduction methods have been introduced. The proposed analytical models, which have been introduced in the fourth chapter of... 

    SEU-mitigation placement and routing algorithms and their impact in SRAM-based FPGAs

    , Article 8th International Symposium on Quality Electronic Design, ISQED 2007, San Jose, CA, 26 March 2007 through 28 March 2007 ; 2007 , Pages 380-385 ; 0769527957 (ISBN); 9780769527956 (ISBN) Zarandi, H. R ; Miremadi, S. G ; Pradhan, D. K ; Mathew, J ; Sharif University of Technology
    In this paper, we propose a new SEU-mitigative placement and routing of circuits in the FPGAs which is based on the popular VPR tool. The VPR tool is modified so that during placement and routing, decisions are taken with awareness of SEU-mitigation. Moreover, no redundancies during the placement and routing are used but the algorithms are based on the SEU avoidance. Using the modified tool, i.e., S-VPR, the role of placement and routing algorithms on the fault-tolerance of circuits implemented on FPGAs is achieved. The secondary propose of this paper is to find which of placement or routing is more suited for decreasing SEU sensibility of circuits and to find whether these SEU sensibility... 

    A new power quality enhancement method for two-phase loads

    , Article 2006 International Conference on Power Electronics, Drives and Energy Systems, PEDES '06, New Delhi, 12 December 2006 through 15 December 2006 ; 2006 ; 078039772X (ISBN); 9780780397729 (ISBN) Hojabri, H ; Mokhtari, H ; Sharif University of Technology
    This paper describes a new compensating system for the flicker and harmonics generated by a highly-varying load, e.g. a welding machine, connected between two phases of a three-phase system. The proposed system is an active filter with two-phase structure employed in a three-phase system. The system also employs simple and effective control strategies for dc-bus regulation and current control. The proposed system is a package with less switches compared to the conventional three-phase systems. It results in no increase in switch ratings, thus giving a more economic compensator. © 2006 IEEE  

    On the fair accounting of carbon emissions in the global system using an exergy cost formation concept

    , Article Journal of Cleaner Production ; Volume 280 , 2021 ; 09596526 (ISSN) Khajehpour, H ; Saboohi, Y ; Tsatsaronis, G ; Sharif University of Technology
    Elsevier Ltd  2021
    Carbon accounting is necessary for designing effective climate change mitigation policies. A proper and fair accounting method should motivate both the producers toward cleaner production methods and the consumers toward reducing the embodied emissions of their consumption. This research work proposes a new approach to map the production chain of carbon emissions in which every subsystem is responsible for the level and efficiency of its production activities and embodied emissions for providing its economic activities or final demands. The exergy cost formation concept is used to track the emissions in the production chain. The results of this accounting present the total carbon loads on...