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    Multi-Criteria Appraisal of Regular Bus, Bus Rapid Transit and Metro in Tehran

    , M.Sc. Thesis Sharif University of Technology Keyvan Ekbatani, Mehdi (Author) ; Vaziri, Manuchehr (Supervisor)
    Abstract
    Viewpoints of various interest groups should be addressed in any public service appraisal. Urban public transportation development and services have diverse impacts on users, operators and the community. The impacts can be characterized by a wide range of perspectives including: efficiency, effectiveness, efficacy, economic, social and environmental dimensions. Deployment of quantitative techniques, such as multicriteria decision making methods, would facilitate such a multidimensional analysis and appraisal. The objective of the study summarized herein was to shed some light on the perceived attributes pertinent to the Tehran regular transit service appraisal. The major services include... 

    Design and Manufacture of Fluidized Bed Reactor in Pilot Scheme for Multiple Chemical Reactions at High Temperature and
    Reduction of MnO2 to MnO by CO in Fluidized Bed Reactor

    , M.Sc. Thesis Sharif University of Technology Shakeriyan, Mojtaba (Author) ; Halali, Mohammad (Supervisor) ; Hakim, Manuchehr (Supervisor)
    Abstract
    In this study designing and manufacturing of high-temperature fluidized bed reactor were performed. These reactors are based on the contact of fluid with solid particles and balancing the weight of the solid materials. In the manufactured reactor, reduction of manganese de oxide to manganese oxide was done by carbon monoxide produced from incomplete combustion. The most important parameters in the reduction rate are: bed temperature and reduction gas concentration. Materials were injected into the reactor under the pressure of 1.13 mmHg and temperature of 787 ℃ in the bed depth of 4 cm for 2 hours and then the product was removed. XRD patterns showed that the dominant phase in the product... 

    Modeling of Anaerobic Baffled Bioreactors for Industrial Wastewater Treatment

    , M.Sc. Thesis Sharif University of Technology Rajaei, Mozhdeh (Author) ; Vosoughi, Manuchehr (Supervisor) ; Borghei, Mahdi (Supervisor)
    Abstract
    Nowadays anaerobic treatment of wastewater has been gaining more and more popularity. This process is usually used for waste sludge and wastewater with high concentrations of organic pollutants. One bioreactor that uses the anaerobic process to treat wastewater is the Anaerobic Baffled Reactor (ABR). This reactor was studied in the present study. The Anaerobic Baffled Reactor is composed of a series of up flow anaerobic sludge reactors. A simple design, low process cost, low sludge production and the lack of a need for a separator of the gas and sludge are some of the important characteristics of this reactor. Furthermore, ABRs are resistant against temperature and pH and can separate... 

    A comparative appraisal of roadway accident for Asia-Pacific countries

    , Article International Journal of Engineering, Transactions A: Basics ; Volume 23, Issue 2 , 2010 , Pages 111-126 ; 17281431 (ISSN) Vaziri, M ; Sharif University of Technology
    Materials and Energy Research Center  2010
    Abstract
    This paper describes an attempt to shed some light on road safety in Asia Pacific region by characterizing and assessing its road accidents. The relevant national road accident data were extracted from centralized data sources of international agencies. Due to data incompleteness and missing values, 21 Asia Pacific countries, presenting more than half of the world's population, were selected for detailed analysis. The study database consisted of 7 variables, covering years 1980 and 1995. The univariate and multivariate statistical analyses for the selected countries showed interesting results and relations for the selected variables. Accident rates, reflecting road accident risk and... 

    A study of highway noise pollution in Tehran

    , Article Eighth International Conference on Urban Transport and the Environment for the 21st Century, URBAN TRANSPORT VIII, Seville, 13 March 2002 through 15 March 2002 ; 2002 , Pages 651-657 ; 1462608X (ISSN) Vaziri, M ; Sharif University of Technology
    2002
    Abstract
    Roadway traffic noise pollution for the Greater Tehran Metropolitan Area (GTMA) was analyzed. The study database consisted of relevant information about the noise level, traffic, roadway and meteorological characteristics. The collected noise level information at the roadway sound level meter receptor site included equivalent noise level. The equivalent noise level at reception points along the GTMA roadways was found often in breach of noise standards  

    Development of highway congestion index with fuzzy set models

    , Article Transportation Research Record ; Issue 1802 , 2002 , Pages 16-22 ; 03611981 (ISSN) Vaziri, M ; Sharif University of Technology
    National Research Council  2002
    Abstract
    Development of a highway congestion index on the basis of expert and user opinions with fuzzy set theory was attempted. Forty 1-min videotape segments showing different highway traffic flow conditions were displayed to a group of highway experts and users. They were asked to complete the relevant questionnaires on the existence and acceptability of congestion for each video segment display. Five congestion-descriptive variables of travel speed, travel rate, delay rate, travel rate ratio, and delay ratio were determined for each video segment. Information about the values of congestion-descriptive variables for the displayed videos, questionnaire responses, and fuzzy set theory were used to... 

    Modeling vehicle air pollution attributes by artificial neural network

    , Article Scientia Iranica ; Volume 8, Issue 1 , 2001 , Pages 10-15 ; 10263098 (ISSN) Vaziri, M ; Sharif University of Technology
    Sharif University of Technology  2001
    Abstract
    The municipalities of large Iranian cities require regular air pollutant emission monitoring for motor vehicles. The recorded data include information about commonly regulated air pollutants and motor vehicle characteristics which were randomly selected and studied from the Tehran database. Regression analysis was found ineffective in modeling the relationships among air pollutant, meteorological and motor vehicle characteristics. However, the artificial neural network, ANN, modeling seem to be a useful tool for prediction of air pollutants. The developed ANN models were found to be superior to the developed regression models. Application of the study approach and results could improve motor... 

    Empirical Study for Removal of Oil Contamination by Thermophilic Bacteria

    , M.Sc. Thesis Sharif University of Technology Babaeivelni, Kamel (Author) ; Vossoughi, Manuchehr (Supervisor) ; Alemzade, Iran (Supervisor)
    Abstract
    Biodegradation has always been as a proper method for treatment of oil contamination. Accordingly, several investigations have been done by mesophilic bacteria for biodegradation of hydrocarbons while few studies have been conducted about thermophilic bacteria.
    There are many factors like high growth rate of thermophilic bacteria and good resistance of enzymes secreted from thermophiles against physical and chemical variations lead to the extensive use of thermophilic bacteria for removal of oil contamination. The important factors should be optimized in order to choose a suitable method for the removal of oil contaminations. Optimal conditions for oil contamination removal by... 

    Urban water resources sustainable development: A global comparative appraisal

    , Article Iranian Journal of Science and Technology, Transaction B: Engineering ; Volume 34, Issue 1 , 2010 , Pages 93-106 ; 10286284 (ISSN) Vaziri, M ; Tolouei, R ; Sharif University of Technology
    2010
    Abstract
    The challenges of water resources sustainable development are enormous. Around the globe, the increasing use of water coupled with environmental deterioration calls for sustainable development of the limited water resources. As a significant part of the world's population still lacks access to safe water and adequate sanitation, and as global urbanization continues to increase, continuous, comprehensive, coordinated and cooperative water resources management is required for the sustainable future of urban areas. The objective of this study was to assess water resources sustainable development for selected urban areas around the world. Using centralized databases of international agencies for... 

    A transportation appraisal of mineral fuel trade for Asia

    , Article 6th International Conference on Traffic and Transportation Studies Congress 2008: Traffic and Transportation Studies Congress 2008, ICTTS 2008, Nanning, 5 August 2008 through 7 August 2008 ; Volume 322 , 2008 , Pages 320-333 ; 9780784409954 (ISBN) Vaziri, M ; Amirjamshidi, G ; Sharif University of Technology
    American Society of Civil Engineers (ASCE)  2008
    Abstract
    International trade is the backbone of our modern, commercial world, as producers in various nations try to profit from an expanded market, rather than be limited to selling within their own borders. There are many reasons that trade across national borders occurs, including lower production costs in one region versus another, specialized industries, lack or surplus of natural resources and consumer tastes. In this paper, international trade distribution is analyzed using the Asian multimodal network. This network consists of 31 countries and for the purpose of this study trade is assumed to be distributed between the capitals of the countries. The study concentrates on the Gravity model of... 

    Transportation development and globalization trends: A comparative global assessment

    , Article 1st International Symposium on Transportation and Development Innovative Best Practices 2008, TDIBP 2008, Beijing, 24 April 2008 through 26 April 2008 ; Volume 319 , 2008 , Pages X8-14 ; 9780784409619 (ISBN) Vaziri, M ; Rezaee, A ; Sharif University of Technology
    2008
    Abstract
    Globalization is shaping a new socio-economic order with profound, and still unfolding, implications for transportation development. A prerequisite for national competitiveness in the global market place is efficacious transportation when its recent technological advances have created an unprecedented rise in mobility and accessibility. Developments of efficient and effective transportation infrastructure and services are among the principal driving forces for the globalization process. Using international databanks, this paper describes an attempt to shed some light on national trends of globalization and transportation, and their relationships. Deploying a comparative macroscopic approach... 

    Traffic behavior at urban intersection stop sign and blinking red signal: The Iranian experience

    , Article Scientia Iranica ; Volume 10, Issue 2 , 2003 , Pages 131-141 ; 10263098 (ISSN) Vaziri, M ; Maher, M ; Sharif University of Technology
    Sharif University of Technology  2003
    Abstract
    In this paper, an attempt to identify and characterize minor road traffic behavior at unsignalized urban intersections in a city situated in a developing country is described. Information about the particular traffic behavior was collected using video cameras placed at 12 unsignalized intersections connecting minor to major roadways in Tehran. Stop signs and/or blinking red signals provided the stopping message at the minor approaches of the selected intersections. Relevant information about the behavior of more than 2400 vehicles was extracted from the video displays and the database records consisted of 31 variables reflecting driver, pedestrian, passenger, vehicle and intersection... 

    A Survey on Passing Sight Distance on Two-lane highways According to Road Conditions and Drivers' Behavior in Iran

    , M.Sc. Thesis Sharif University of Technology Jokar, Hadi (Author) ; Vaziri, Manouchehr (Supervisor)
    Abstract
    The main factor ensuring safety of passing maneuvers on two lane highways is known as Passing Sight Distance (PSD). The criteria presented in Iran's code and AASHTO Green book are provided by the results of researches conducted between years 1938 & 1941 in the United States. This research intends to find out whether some changes should be applied to the PSD criteria according to current vehicles' performance and driving behavior in Iran. For this purpose, about 8 hours of video films has been recorded from 3 different sites chosen from two-lane highways in Iran, resulted in 326 passing records. In the case of passing of two passenger cars The models provided by analyzing the videos show that... 

    Study of Traffic Flow Characteristics in Frontage Roads in Iran

    , M.Sc. Thesis Sharif University of Technology Poorjafari, Mohammad (Author) ; Vaziri, Manouchehr (Supervisor)
    Abstract
    Frontage roads are widely used to separate the main and the local traffic flows in multilane highways. Based on the studies conducted by Texas Transportation Institute, the delay imposed by ramp junction is considered for calculating the average speed in frontage roads in addition to the control delay caused by traffic lights. This delay and the capacity of frontage roads are analysed using gap acceptance theory. In this study, two different sections consisting of a basic section and merge area are selected along Tehran-Karaj special road as case studies and the required data are collected by video recording. After classifying and analysing the data, a wide range of macro traffic-analyses... 

    Design of an Algorithm for Automatic Incident Detection by Using Loop Detector Data Compatible to Traffic Conditions in Iran

    , M.Sc. Thesis Sharif University of Technology Asadabadi, Ali (Author) ; Vaziri, Manouchehr (Supervisor)
    Abstract
    Incidents are one of the main sources of delays and they have significant influences on road safety and congestions, air pollution and trip costs. In the time of an incident occurrence, minimizing the response time is essential for several reasons. The most important issue is providing aid for the injured. The faster the persons who are severely injured receive aid, the higher their chances are to be rescued. Also, if the rescue crews get to the incident scene faster the clearance procedure would be accomplished faster and this would result in fewer disturbances in traffic stream and lowering the probability of secondary incidents occurrence. Automatic Incident Detection, AID, has been... 

    Associating Vehicular Characteristics of Urban Fleet and Safety Factors with the Amount of Polluted Emissions

    , M.Sc. Thesis Sharif University of Technology Elahi, Hamid (Author) ; Vaziri, Manouchehr (Supervisor)
    Abstract
    One of the methods that have been used in order to mitigate the air pollution problem is the IM program in order to identify the high polluting vehicle and make them to adjust their engine in accordance to the emission standards. In Iran due to the air pollution problems the government operates a rudimentary IM program based on the idle engine test utilizing an exhaust gas analyzer which should be done annually. While IM programs usually regarded as a useful tool for soothing the air pollution, one of the criticisms about the program is that it is required for the entire fleet and it reduces the cost effectiveness of the program. This research studies the relationship between the vehicular... 

    Analysis of Sight Distance in Railroad-Highway Grade Crossings in Iran

    , M.Sc. Thesis Sharif University of Technology Ramezani, Alireza (Author) ; Vaziri, Manouchehr (Supervisor)
    Abstract
    In railway transportation network, there are spots that we have to intersect with highway network. These intersections break into two branches named grade crossing and unlevel crossing depend on their structure. Grade crossings from the view of protection are grouped into protected crossings and unprotected crossings. Protected crossings depend on their traffic control devices are categorized into active crossings and passive crossings.There are many factors that influence highway-railroad grade crossing design. Some of these factors can vary widely by drivers' behavior. These factors have been developed in models by AASHTO and its publications and shaped like we have them today. In order to... 

    Trade and Transportation Trends of Manufactured Goods in Asia-Europe-Africa

    , M.Sc. Thesis Sharif University of Technology Sohrabi, Alireza (Author) ; Vaziri, Manouchehr (Supervisor)
    Abstract
    This research aims to study the trade trends of Manufactured goods, classified chiefly by Material, identified under Code 6 in the Standard International Trade Classification, SITC, and its nine divisions. The study scope covered 125 countries throughout Asia, Europe and Africa and 9 distinct years spanning a 40-year time period between 1965 and 2005. By means of this study, determinant factors for modelling and investigation of trade flow characteristics for the mentioned items can come to be better understood. The time-series data were grouped into four categories: bilateral trade value, socio-economic, geographical and transportation variables, obtained from centralized international... 

    Transportation Study in Tourist Villages, A Case Study of Niasar

    , M.Sc. Thesis Sharif University of Technology Majdi, Omid (Author) ; Vaziri, Manouchehr (Supervisor)
    Abstract
    This study aimed to shed some light on travel behavior in tourist villages in Iran. Rural areas need efficacious transportation infrastructures and services to promote sustainable development and to avoid urban migration. By exploring the behavioural aspects of rural transportation, their transportation needs and demands can be effectively determined. Subsequently, accessibility and mobility of rural residents can be provided in a sustainable manner. In recent years, tourism has transformed lifestyle and behavior of some rural inhabitants. Utilizing secondary school students in Niasar, a simplified questionnaire was used to collect person and household data. Socio-economic, activity and trip... 

    Identification and Assessment of Nomadic Transportation and Analysis of its Supply and Demand for Mainly Herder Nomads - Case Study: Isfahan Qashqai Tribe

    , M.Sc. Thesis Sharif University of Technology Mansouri, Mehran (Author) ; Vaziri, Manouchehr (Supervisor)
    Abstract
    Although villagers and nomads are an important part of Iran's population, the growth of cities has led to neglecting them and their needs including traveling and transportation needs. The aim of this study is to recognize and to study the transportation demands in a pastoral nomadic society. For this purpose, the theory of activity-based modeling was studied. Sequential modeling was chosen which considers the daily activities of each person as a result of five sequential decisions: a) choosing daily activity pattern; b) choosing primary tour time; c) choosing primary tour mode choice; d) choosing secondary tour time; and e) choosing secondary tour mode choice. In order to conduct a survey...