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    Reconfiguring a set of coverage-providing facilities under travel time uncertainty

    , Article Socio-Economic Planning Sciences ; Volume 62 , 2018 , Pages 1-12 ; 00380121 (ISSN) Berman, O ; Hajizadeh, I ; Krass, D ; Rahimi Vahed, A ; Sharif University of Technology
    Elsevier Ltd  2018
    We study networks of facilities that must provide coverage under conditions of uncertainty with respect to travel times and customer demand. We model this uncertainty through a set of scenarios. Since opening new facilities and/or closing existing ones is often quite expensive, we focus on optimal re-configuration of the network, that is finding a facility set that achieves desired thresholds with respect to expected and minimal coverage, while retaining as many of the existing facilities as possible. We illustrate our model with an example of Toronto Fire Service. We demonstrate that relocating just a few facilities can have the same effect as opening a similar number of new ones. We... 

    The effect of collaboration with top-funded scholars on scientific production

    , Article Science and Public Policy ; Volume 47, Issue 2 , April , 2020 , Pages 219-234 Mirnezami, S. R ; Beaudry, C ; Tahmooresnejad, L ; Sharif University of Technology
    Oxford University Press  2020
    The theoretical model developed in this article predicts that collaboration with top-funded scientists positively affects the number of scientific publications of an individual scientist. Having combined data on funding and publication of Quebec scientists, this article empirically tests the theoretical predictions. This article examines numerous definitions of top-funded scientists as those in the top 10 per cent, or top 5 per cent in terms of total funding, funding from the public sector, and funding from the private sector. The results show that collaborating with such top-funded scientists has a positive effect on a scientist's number of publications, hence confirming our theoretical... 

    Effects of turbulent models and baffle position on the hydrodynamics of settling tanks

    , Article Scientia Iranica ; Volume 13, Issue 3 , 2006 , Pages 255-260 ; 10263098 (ISSN) Tamayol, A ; Firoozabadi, B ; Sharif University of Technology
    Sharif University of Technology  2006
    In this paper, the numerical results of hydrodynamic modeling of primary settling tanks are presented. The flow field is assumed to be incompressible and non-buoyant. The effects of two different types of turbulence model, standard κ - ε and RNG, are compared with each other. The effects of an inlet baffle on the hydrodynamics of settling tanks are also studied. Results are obtained for the primary settling tank of the city of Sarnia, Ontario, Canada. The effects of the existence and position of another interior baffle in the settling tanks are also studied. Results in the different parts are compared with experimental and numerical data and showed good agreement. Comparison between two... 

    A hybrid algorithm for prediction of varying heart rate motion in computer-assisted beating heart surgery

    , Article Journal of Medical Systems ; Volume 42, Issue 10 , 2018 ; 01485598 (ISSN) Mansouri, S ; Farahmand, F ; Vossoughi, G ; Alizadeh Ghavidel, A ; Sharif University of Technology
    Springer New York LLC  2018
    An essential requirement for performing robotic assisted surgery on a freely beating heart is a prediction algorithm which can estimate the future trajectory of the heart in the varying heart rate (HR) conditions of real surgery with a high accuracy. In this study, a hybrid amplitude modulation- (AM) and autoregressive- (AR) based algorithm was developed to enable estimating the global and local oscillations of the beating heart, raised from its major and minor physiological activities. The AM model was equipped with an estimator of the heartbeat frequency to compensate for the HR variations. The RMS of the prediction errors of the hybrid algorithm was in the range of 165–361 μm for the... 

    Technical assessment of ground-source, air-source, and hybrid heat pumps for single-family buildings in cold climates

    , Article 25 June 2016 through 29 June 2016 ; Volume 122 , 2016 , Pages 270-280 ; 00012505 (ISSN) ; 9781939200464 (ISBN) Eslami Nejad, P ; Hakkaki Fard, A. M ; Aidoun, Z ; Ouzzane, M ; Sharif University of Technology
    Amer. Soc. Heating, Ref. Air-Conditoning Eng. Inc 
    This paper discusses a technical comparison of a directexpansion ground-source heat pump (DX-GSHP) and an airsource heat pump (ASHP). To lower the ground heat exchanger size for cost reduction purposes, the system performance of a hybrid system is also evaluated using a supplementary air evaporator combined with the DX-GSHP. Detailed screening models previously developed for ASHPs and DX-GHSPs are first used to compare the seasonal performance of these two options for a residential building in the cold-climate city of Montreal, Canada. Then, the model is adopted for performance evaluation of the hybrid system. Additionally, different parameters including borehole total length and heat pump... 

    Evaluation of refrigerant mixtures in three different cold-climate residential air-source heat pumps

    , Article ASHRAE Transactions, 25 June 2016 through 29 June 2016 ; Volume 122 , 2016 , Pages 63-70 ; 00012505 (ISSN) ; 9781939200464 (ISBN) Hakkaki Fard, A ; Aidoun, Z ; Eslami Nejad, P ; Sharif University of Technology
    Amer. Soc. Heating, Ref. Air-Conditoning Eng. Inc  2016
    This paper addresses the challenge of improving the performance of heat pumps (HPs) in cold-climate conditions by applying refrigerant mixtures. The potential benefits of implementing R-32/CO2 zeotropic refrigerant mixtures in three different residential air-source HPs for cold climates are studied. The cases considered are conventional residential HP, HP with a variable mixture control system, and HP with a variable compressor speed. The seasonal performance of a heating system with these air-source HPs, supplemented with an auxiliary electric heater, is studied in the cold-climate city of Montreal, Canada. To this aim, a detailed screening HP model previously developed is modified and... 

    Combined UV-C/H2O2-VUV processes for the treatment of an actual slaughterhouse wastewater

    , Article Journal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes ; Volume 52, Issue 5 , 2017 , Pages 314-325 ; 03601234 (ISSN) Vaezzadeh Naderi, K ; Bustillo Lecompte, C. F ; Mehrvar, M ; Abdekhodaie, M. J ; Sharif University of Technology
    Taylor and Francis Inc  2017
    In this study, a three-factor, three-level Box-Behnken design with response surface methodology were used to maximize the TOC removal and minimize the H2O2 residual in the effluent of the combined UV-C/H2O2-VUV system for the treatment of an actual slaughterhouse wastewater (SWW) collected from one of the meat processing plants in Ontario, Canada. The irradiation time and the initial concentrations of total organic carbon (TOCo) and hydrogen peroxide (H2O2o) were the three predictors, as independent variables, studied in the design of experiments. The multiple response approach was used to obtain desirability response surfaces at the optimum factor settings. Subsequently, the optimum... 

    Sensitivity of a real-time freeway crash prediction model to calibration optimality

    , Article European Transport Research Review ; Volume 4, Issue 3 , September , 2012 , Pages 167-174 ; 18670717 (ISSN) Samimi, A ; Hellinga, B ; Sharif University of Technology
    Background: Real-time crash prediction models are often structured as general log-linear categorical models which must be calibrated using an extensive database. However, there is no method to optimally select the number of categories and the values that define the boundaries between categories when representing continuous measures as categorical variables within the log-linear model. This raises the question of how important the calibration is to the safety impacts estimated when using the crash prediction model. In this paper, we examined the impact that the process used to calibrate the crash prediction model has on estimates of safety impacts of a variable speed limit system. Methods:... 

    Parametric study of buried steel and high density polyethylene gas pipelines due to oblique-reverse faulting

    , Article Canadian Journal of Civil Engineering ; Volume 42, Issue 3 , 2015 , Pages 178-189 ; 03151468 (ISSN) Rahimzadeh Rofooei, F ; Hojat Jalali, H ; Khajeh Ahmad Attari, N ; Kenarangi, H ; Samadian, M ; Sharif University of Technology
    National Research Council of Canada  2015
    A numerical study is carried out on buried steel and high density polyethylene (HDPE) pipelines subjected to oblique-reverse faulting. The components of the oblique-reverse offset along the horizontal and normal directions in the fault plane are determined using well-known empirical equations. The numerical model is validated using the experimental results and detailed finite element model of a 114.3 mm (4==) steel gas pipe subjected to a reverse fault offset up to 0.6 m along the faulting direction. Different parameters such as the pipe material, the burial depth to the pipe diameter ratio (H/D), the pipe diameter to wall thickness ratio (D/t), and the fault–pipe crossing angle are... 

    The Oswestry Disability Index, the Roland-Morris Disability Questionnaire, and the Quebec Back Pain Disability Scale: Translation and validation studies of the Iranian versions

    , Article Spine ; Volume 31, Issue 14 , 2006 , Pages E454-E459 ; 03622436 (ISSN) Mousavi, S.J ; Parnianpour, M ; Mehdian, H ; Montazeri, A ; Mobini, B ; Sharif University of Technology
    STUDY DESIGN. Cross-cultural translation and psychometric testing were performed. OBJECTIVES. To cross-culturally translate the Oswestry Disability Index (ODI), Roland-Morris Disability Questionnaire (RDQ), and Quebec Back Pain Disability Scale (QDS) into Persian, and then investigate the psychometric properties of the Persian versions produced. SUMMARY OF BACKGROUND DATA. To the authors' knowledge, there is no validated instrument to measure functional status in Persian-speaking patients with low back pain (LBP) in Iran. To our knowledge, the widely used back-specific measures, the ODI, RDQ, and QDS, have not been translated and validated for Persian-speaking patients with LBP. METHODS. The... 

    A systematic review of land use regression models for volatile organic compounds

    , Article Atmospheric Environment ; Volume 171 , 2017 , Pages 1-16 ; 13522310 (ISSN) Amini, H ; Yunesian, M ; Hosseini, V ; Schindler, C ; Henderson, S. B ; Künzli, N ; Sharif University of Technology
    Various aspects of land use regression (LUR) models for volatile organic compounds (VOCs) were systematically reviewed. Sixteen studies were identified published between 2002 and 2017. Of these, six were conducted in Canada, five in the USA, two in Spain, and one each in Germany, Italy, and Iran. They were developed for 14 different individual VOCs or groupings: benzene; toluene; ethylbenzene; m-xylene; p-xylene; (m/p)-xylene; o-xylene; total BTEX; 1,3-butadiene; formaldehyde; n-hexane; total hydro carbons; styrene; and acrolein. The models were based on measurements ranging from 22 sites in El Paso (USA) to 179 sites in Tehran (Iran). Only four studies in Rome (Italy), Sabadell (Spain),... 

    The global, regional, and national burden of oesophageal cancer and its attributable risk factors in 195 countries and territories, 1990-2017: A systematic analysis for the Global Burden of Disease Study 2017

    , Article The Lancet Gastroenterology and Hepatology ; Volume 5, Issue 6 , June , 2020 , Pages 582-597 Kamangar, F ; Nasrollahzadeh, D ; Safiri, S ; Sepanlou, S. G ; Fitzmaurice, C ; Ikuta, K. S ; Bisignano, C ; Islami, F ; Roshandel, G ; Lim, S. S ; Abolhassani, H ; Abu Gharbieh, E ; Adedoyin, R. A ; Advani, S. M ; Ahmed, M. B ; Aichour, M. T. E ; Akinyemiju, T ; Akunna, C. J ; Alahdab, F ; Alipour, V ; Almasi Hashiani, A ; Almulhim, A. M ; Anber, N. H ; Ansari Moghaddam, A ; Arabloo, J ; Arab Zozani, M ; Awedew, A. F ; Badawi, A ; Berfield, K. S. S ; Berhe, K ; Bhattacharyya, K ; Biondi, A ; Bjørge, T ; Borzì, A. M ; Bosetti, C ; Carreras, G ; Carvalho, F ; Castro, C ; Chu, D. T ; Costa, V. M ; Dagnew, B ; Gela, J. D ; Daryani, A ; Demeke, F. M ; Demoz, G. T ; Dianatinasab, M ; Elbarazi, I ; Emamian, M. H ; Etemadi, A ; Faris, P. S ; Fernandes, E ; Filip, I ; Fischer, F ; Gad, M. M ; Gallus, S ; Gebre, A. K ; Gebrehiwot, T. T ; Gebremeskel, G. G ; Gebresillassie, B. M ; Ghasemi Kebria, F ; Ghashghaee, A ; Ghith, N ; Golechha, M ; Gorini, G ; Gupta, R ; Hafezi Nejad, N ; Haj Mirzaian, A ; Harvey, J. D ; Hashemian, M ; Hassen, H. Y ; Hay, S. I ; Henok, A ; Hoang, C. L ; Hosgood, H. D ; Househ, M ; Ilesanmi, O. S ; Ilic, M.D ; Irvani, S. S. N ; Jain, C ; James, S. L ; Jee, S. H ; Jha, R. P ; Joukar, F ; Kabir, A ; Kasaeian, A ; Kassaw, M. W ; Kaur, S ; Kengne, A. P ; Kerboua, E ; Khader, Y. S ; Khalilov, R ; Khan, E. A ; Khoja, A. T ; Kocarnik, J. M ; Komaki, H ; Kumar, V ; La Vecchia, C ; Lasrado, S ; Li, B ; Lopez, A. D ; Majeed, A ; Manafi, N ; Manda, A. L ; Mansour Ghanaei, F ; Mathur, M. R ; Mehta, V ; Mehta, D ; Mendoza, W ; Mithra, P ; Mohammad, K. A ; Mohammadian Hafshejani, A ; Mohammadpourhodki, R ; Mohammed, J. A ; Mohebi, F ; Mokdad, A. H ; Monasta, L ; Moosavi, D ; Moosazadeh, M ; Moradi, G ; Moradpour, F ; Moradzadeh, R ; Naik, G ; Negoi, I ; Nggada, H. A ; Nguyen, H. L. T ; Nikbakhsh, R ; Nixon, M. R ; Olagunju, A. T ; Olagunju, T. O ; Padubidri, J. R ; Pakshir, K ; Patel, S ; Pathak, M ; Pham, H. Q ; Pourshams, A ; Rabiee, N ; Rabiee, M ; Radfar, A ; Rafiei, A ; Ramezanzadeh, K ; Rath, G. K ; Rathi, P ; Rawaf, S ; Rawaf, D. L ; Rezaei, N ; Roro, E. M ; Saad, A. M ; Salimzadeh, H ; Samy, A. M ; Sartorius, B ; Sarveazad, A ; Sekerija, M ; Sha, F ; Shamsizadeh, M ; Sheikhbahaei, S ; Shirkoohi, R ; Malleshappa, S. K. S ; Singh, J. A ; Sinha, D. N ; Smarandache, C. G ; Soshnikov, S ; Suleria, H. A. R ; Tadesse, D. B ; Tesfay, B. E ; Thakur, B ; Traini, E ; Tran, K. B ; Tran, B. X ; Ullah, I ; Vacante, M ; Veisani, Y ; Vujcic, I. S ; Weldesamuel, G. T ; Xu, R ; Yazdi Feyzabadi, V ; Yuce, D ; Zadnik, V ; Zaidi, Z ; Zhang, Z. J ; Malekzadeh, R ; Naghavi, M ; GBD 2017 Oesophageal Cancer Collaborators ; Sharif University of Technology
    Elsevier Ltd  2020
    Background Oesophageal cancer is a common and often fatal cancer that has two main histological subtypes: oesophageal squamous cell carcinoma and oesophageal adenocarcinoma. Updated statistics on the incidence and mortality of oesophageal cancer, and on the disability-adjusted life-years (DALYs) caused by the disease, can assist policy makers in allocating resources for prevention, treatment, and care of oesophageal cancer. We report the latest estimates of these statistics for 195 countries and territories between 1990 and 2017, by age, sex, and Socio-demographic Index (SDI), using data from the Global Burden of Diseases, Injuries, and Risk Factors Study 2017 (GBD). Methods We used data...