Search for: spatiotemporal-analysis
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    Delay-based passenger car equivalent at signalized intersections in Iran

    , Article Promet - Traffic - Traffico ; Volume 29, Issue 2 , 2017 , Pages 135-142 ; 03535320 (ISSN) Nassiri, H ; Tabatabaie, S ; Sahebi, S ; Sharif University of Technology
    Faculty of Transport and Traffic Engineering  2017
    Due to their different sizes and operational characteristics, vehicles other than passenger cars have a different influence on traffic operations especially at intersections. The passenger car equivalent (PCE) is the parameter that shows how many passenger cars must be substituted for a specific heavy vehicle to represent its influence on traffic operation. PCE is commonly estimated using headway-based methods that consider the excess headway utilized by heavy vehicles. In this research, the PCE was estimated based on the delay parameter at three signalized intersections in Tehran, Iran. The data collected were traffic volume, travel time for each movement, signalization, and geometric... 

    The millennium-old hydrogeology textbook the Extraction of Hidden Waters by the Persian mathematician and engineer Abubakr Mohammad Karaji (953 CE-1029 CE)

    , Article Hydrology and Earth System Sciences ; Volume 24, Issue 2 , 2020 , Pages 761-769 Ataie Ashtiani, B ; Simmons, C. T ; Sharif University of Technology
    Copernicus GmbH  2020
    We revisit and shed light on the millennium-old hydrogeology textbook The Extraction of Hidden Waters by the Persian mathematician and engineer Karaji. Despite the nature of the understanding and conceptualization of the world by the people of that time, ground-breaking ideas and descriptions of hydrological and hydrogeological perceptions such as components of hydrological cycle, groundwater quality and even driving factors for groundwater flow were presented in the book. Although some of these ideas may have been presented elsewhere, to the best of our knowledge, this is the first time that a whole book was focused on different aspects of hydrology and hydrogeology. More importantly, we... 

    Ranking locations for hydrogen production using hybrid wind-solar: a case study

    , Article Sustainability (Switzerland) ; Volume 13, Issue 8 , 2021 ; 20711050 (ISSN) Almutairi, K ; Mostafaeipour, A ; Jahanshahi, E ; Jooyandeh, E ; Himri, Y ; Jahangiri, M ; Issakhov, A ; Chowdhury, S ; Hosseini Dehshiri, J ; Hosseini Dehshiri, S ; Techato, K ; Sharif University of Technology
    MDPI  2021
    Observing the growing energy demand of modern societies, many countries have rec-ognized energy security as a looming problem and renewable energies as a solution to this issue. Renewable hydrogen production is an excellent method for the storage and transfer of energy generated by intermittent renewable sources such as wind and solar so that they can be used at a place and time of our choosing. In this study, the suitability of 15 cities in Fars province, Iran, for renewable hydrogen production was investigated and compared by the use of multiple multi-criteria decision-making methods including ARAS, SAW, CODAS, and TOPSIS. The obtained rankings were aggregated by rank averaging, Borda... 

    Contribution of the Middle Eastern dust source areas to PM10 levels in urban receptors: Case study of Tehran, Iran

    , Article Atmospheric Environment ; Volume 75 , 2013 , Pages 287-295 ; 13522310 (ISSN) Givehchi, R ; Arhami, M ; Tajrishy, M ; Sharif University of Technology
    The origins and evolution of the Middle Eastern dust storms which frequently impact the residents of this arid region were studied. A methodology was adapted and developed to identify the desert regions of potential dust sources and determine their contributions to PM10 concentrations in the highly-populated receptor city of Tehran, Iran. Initially, the episodes of regional dust intrusion and the resulting amounts of increase in the particulate concentrations during these episodes were determined using a statistical analyzing methodology. The dust episodes were also inspected with the aerosol index information from the Ozone Monitoring Instrument (OMI). The Hybrid Single-Particle Lagrangian... 

    Seismic responses of arch dams due to non-uniform ground motions

    , Article Scientia Iranica ; Volume 19, Issue 6 , December , 2012 , Pages 1431-1436 ; 10263098 (ISSN) Ghaemian, M ; Sohrabi Gilani, M ; Sharif University of Technology
    In the present paper, spatially variation input effects on seismic responses of arch dams have been studied. Recorded ground accelerations at the dam foundation interface of Pacoima dam during January 13, 2001 were used for the purpose of this investigation. A numerical finite element model was developed for dynamic analysis of the dam reservoir system. The modified version of NSAD-DRI finite element program was used for the analysis and the ground acceleration time histories were interpolated at all dam foundation interface nodal points. Total and pseudo static displacements as well as developed stresses due to uniform and non uniform excitations are obtained. The results reveal that... 

    Experimental investigation of transition on a plunging airfoil

    , Article Scientia Iranica ; Volume 17, Issue 6 B , NOVEMBER-DECEMBER , 2010 , Pages 468-479 ; 10263098 (ISSN) Soltani, M. R ; Rasi Marzabadi, F ; Sharif University of Technology
    Extensive tests were carried out on a section of a wind turbine blade. The effect of reduced frequency on the boundary layer transition point of the model oscillating in plunge has been investigated. The spatial-temporal progressions of the transition point and the state of the unsteady boundary layer were measured using multiple hot-film sensors. The measurements showed that reduced frequency highly affects variations of the transition point and results in a hysteresis loop in the dynamic transition locations. The dominated frequencies of the boundary layer are found to be a function of the reduced frequency and mean angle of attack  

    Effect of a standing baffle on the flow structure in a rectangular open channel

    , Article Journal of Hydraulic Research ; Volume 48, Issue 3 , Jun , 2010 , Pages 400-404 ; 00221686 (ISSN) Jamshidnia, H ; Takeda, Y ; Firoozabadi, B ; Sharif University of Technology
    The effect of an intermediate standing baffle on the flow structure in a rectangular open channel has been investigated by a three-dimensional acoustic Doppler velocimeter. Investigation of time-averaged velocity profiles at different streamwise positions reveals that the approach flow is fully developed upstream of the baffle. By analysing the space-averaged power spectra of streamwise velocity, a peak structure was observed in the upstream baffle region. Downstream of the baffle this peak structure has been alleviated by the baffle. The same analysis for the vertical component indicates the existence of a peak structure both up- and downstream of the baffle. Consequently, a baffle affects... 

    Mapping 123 million neonatal, infant and child deaths between 2000 and 2017

    , Article Nature ; Volume 574, Issue 7778 , 2019 , Pages 353-358 ; 00280836 (ISSN) Burstein, R ; Henry, N. J ; Collison, M. L ; Marczak, L. B ; Sligar, A ; Watson, S ; Marquez, N ; Abbasalizad Farhangi, M ; Abbasi, M ; Abd-Allah, F ; Abdoli, A ; Abdollahi, M ; Abdollahpour, I ; Abdulkader, R. S ; Abrigo, M. R. M ; Acharya, D ; Adebayo, O. M ; Adekanmbi, V ; Adham, D ; Afshari, M ; Aghaali, M ; Ahmadi, K ; Ahmadi, M ; Ahmadpour, E ; Ahmed, R ; Akal, C. G ; Akinyemi, J. O ; Alahdab, F ; Alam, N ; Alamene, G. M ; Alene, K. A ; Alijanzadeh, M ; Alinia, C ; Alipour, V ; Aljunid, S. M ; Almalki, M. J ; Al-Mekhlafi, H. M ; Altirkawi, K ; Alvis-Guzman, N ; Amegah, A. K ; Amini, S ; Amit, A. M. L ; Anbari, Z ; Androudi, S ; Anjomshoa, M ; Ansari, F ; Antonio, C. A. T ; Arabloo, J ; Arefi, Z ; Aremu, O ; Armoon, B ; Arora, A ; Artaman, A ; Asadi, A ; Asadi Aliabadi, M ; Ashraf Ganjouei, A ; Assadi, R ; Ataeinia, B ; Atre, S. R ; Quintanilla, B. P. A ; Ayanore, M. A ; Azari, S ; Babaee, E ; Babazadeh, A ; Badawi, A ; Bagheri, S ; Bagherzadeh, M ; Baheiraei, N ; Balouchi, A ; Barac, A ; Bassat, Q ; Baune, B. T ; Bayati, M ; Bedi, N ; Beghi, E ; Behzadifar, M ; Behzadifar, M ; Belay, Y. B ; Bell, B ; Bell, M. L ; Berbada, D. A ; Bernstein, R. S ; Bhattacharjee, N. V ; Bhattarai, S ; Bhutta, Z. A ; Bijani, A ; Bohlouli, S ; Breitborde, N. J. K ; Britton, G ; Browne, A. J ; Nagaraja, S. B ; Busse, R ; Butt, Z. A ; Car, J ; Cárdenas, R ; Castañeda Orjuela, C. A ; Cerin, E ; Chanie, W. F ; Chatterjee, P ; Chu, D. T ; Cooper, C ; Costa, V. M ; Dalal, K ; Dandona, L ; Dandona, R ; Daoud, F ; Daryani, A ; Das Gupta, R ; Davis, I ; Davis Weaver, N ; Davitoiu, D. V ; De Neve, J. W ; Demeke, F. M ; Demoz, G. T ; Deribe, K ; Desai, R ; Deshpande, A ; Desyibelew, H. D ; Dey, S ; Dharmaratne, S. D ; Dhimal, M ; Diaz, D ; Doshmangir, L ; Duraes, A. R ; Dwyer Lindgren, L ; Earl, L ; Ebrahimi, R ; Ebrahimpour, S ; Effiong, A ; Eftekhari, A ; Ehsani Chimeh, E ; El Sayed, I ; El Sayed Zaki, M ; El Tantawi, M ; El-Khatib, Z ; Emamian, M. H ; Enany, S ; Eskandarieh, S ; Eyawo, O ; Ezalarab, M ; Faramarzi, M ; Fareed, M ; Faridnia, R ; Faro, A ; Fazaeli, A.A ; Fazlzadeh, M ; Fentahun, N ; Fereshtehnejad, S. M ; Fernandes, J. C ; Filip, I ; Fischer, F ; Foigt, N. A ; Foroutan, M ; Francis, J. M ; Fukumoto, T ; Fullman, N ; Gallus, S ; Gebre, D. G ; Gebrehiwot, T. T ; Gebremeskel, G. G ; Gessner, B. D ; Geta, B ; Gething, P. W ; Ghadimi, R ; Ghadiri, K ; Ghajarzadeh, M ; Ghashghaee, A ; Gill, P. S ; Gill, T. K ; Golding, N ; Gomes, N. G. M ; Gona, P. N ; Gopalani, S. V ; Gorini, G ; Goulart, B. N. G ; Graetz, N ; Greaves, F ; Green, M. S ; Guo, Y ; Haj-Mirzaian, A ; Haj-Mirzaian, A ; Hall, B. J ; Hamidi, S ; Haririan, H ; Haro, J. M ; Hasankhani, M ; Hasanpoor, E ; Hasanzadeh, A ; Hassankhani, H ; Hassen, H. Y ; Hegazy, M. I ; Hendrie, D ; Heydarpour, F ; Hird, T. R ; Hoang, C. L ; Hollerich, G ; Rad, E. H ; Hoseini Ghahfarokhi, M ; Hossain, N ; Hosseini, M ; Hosseinzadeh, M ; Hostiuc, M ; Hostiuc, S ; Househ, M ; Hsairi, M ; Ilesanmi, O. S ; Imani-Nasab, M. H ; Iqbal, U ; Irvani, S. S. N ; Islam, N ; Islam, S. M. S ; Jürisson, M ; Balalami, N. J ; Jalali, A ; Javidnia, J ; Jayatilleke, A. U ; Jenabi, E ; Ji, J. S ; Jobanputra, Y. B ; Johnson, K ; Jonas, J. B ; Shushtari, Z. J ; Jozwiak, J. J ; Kabir, A ; Kahsay, A ; Kalani, H ; Kalhor, R ; Karami, M ; Karki, S ; Kasaeian, A ; Kassebaum, N. J ; Keiyoro, P. N ; Kemp, G. R ; Khabiri, R ; Khader, Y. S ; Khafaie, M. A ; Khan, E. A ; Khan, J ; Khan, M. S ; Khang, Y. H ; Khatab, K ; Khater, A ; Khater, M. M ; Khatony, A ; Khazaei, M ; Khazaei, S ; Khazaei Pool, M ; Khubchandani, J ; Kianipour, N ; Kim, Y. J ; Kimokoti, R. W ; Kinyoki, D. K ; Kisa, A ; Kisa, S ; Kolola, T ; Kosen, S ; Koul, P. A ; Koyanagi, A ; Kraemer, M. U. G ; Krishan, K ; Krohn, K. J ; Kugbey, N ; Kumar, G. A ; Kumar, M ; Kumar, P ; Kuupiel, D ; Lacey, B ; Lad, S. D ; Lami, F. H ; Larsson, A. O ; Lee, P. H ; Leili, M ; Levine, A. J ; Li, S ; Lim, L. L ; Listl, S ; Longbottom, J ; Lopez, J. C. F ; Lorkowski, S ; Magdeldin, S ; Abd El Razek, H. M ; Abd El Razek, M. M ; Majeed, A ; Maleki, A ; Malekzadeh, R ; Malta, D. C ; Mamun, A. A ; Manafi, N ; Manda, A. L ; Mansourian, M ; Martins-Melo, F. R ; Masaka, A ; Massenburg, B. B ; Maulik, P. K ; Mayala, B. K ; Mazidi, M ; McKee, M ; Mehrotra, R ; Mehta, K. M ; Meles, G. G ; Mendoza, W ; Menezes, R. G ; Meretoja, A ; Meretoja, T. J ; Mestrovic, T ; Miller, T. R ; Miller-Petrie, M. K ; Mills, E. J ; Milne, G. J ; Mini, G. K ; Mir, S. M ; Mirjalali, H ; Mirrakhimov, E. M ; Mohamadi, E ; Mohammad, D. K ; Darwesh, A. M ; Mezerji, N. M. G ; Mohammed, A. S ; Mohammed, S ; Mokdad, A. H ; Molokhia, M ; Monasta, L ; Moodley, Y ; Moosazadeh, M ; Moradi, G ; Moradi, M ; Moradi, Y ; Moradi Lakeh, M ; Moradinazar, M ; Moraga, P ; Morawska, L ; Mosapour, A ; Mousavi, S. M ; Mueller, U. O ; Muluneh, A. G ; Mustafa, G ; Nabavizadeh, B ; Naderi, M ; Nagarajan, A. J ; Nahvijou, A ; Najafi, F ; Nangia, V ; Ndwandwe, D. E ; Neamati, N ; Negoi, I ; Negoi, R. I ; Ngunjiri, J. W ; Thi Nguyen, H. L ; Nguyen, L. H ; Nguyen, S. H ; Nielsen, K. R ; Ningrum, D. N. A ; Nirayo, Y. L ; Nixon, M. R ; Nnaji, C. A ; Nojomi, M ; Noroozi, M ; Nosratnejad, S ; Noubiap, J. J ; Motlagh, S. N ; Ofori Asenso, R ; Ogbo, F. A ; Oladimeji, K. E ; Olagunju, A. T ; Olfatifar, M ; Olum, S ; Olusanya, B. O ; Oluwasanu, M. M ; Onwujekwe, O. E ; Oren, E ; Ortega Altamirano, D. D. V ; Ortiz, A ; Osarenotor, O ; Osei, F. B ; Osgood-Zimmerman, A. E ; Otstavnov, S. S ; Owolabi, M. O ; Mahesh, P. A ; Pagheh, A.S ; Pakhale, S ; Panda Jonas, S ; Pandey, A ; Park, E. K ; Parsian, H ; Pashaei, T ; Patel, S. K ; Pepito, V. C. F ; Pereira, A ; Perkins, S ; Pickering, B. V ; Pilgrim, T ; Pirestani, M ; Piroozi, B ; Pirsaheb, M ; Plana Ripoll, O ; Pourjafar, H ; Puri, P ; Qorbani, M ; Quintana, H ; Rabiee, M ; Sharif University of Technology
    Nature Publishing Group  2019
    Since 2000, many countries have achieved considerable success in improving child survival, but localized progress remains unclear. To inform efforts towards United Nations Sustainable Development Goal 3.2—to end preventable child deaths by 2030—we need consistently estimated data at the subnational level regarding child mortality rates and trends. Here we quantified, for the period 2000–2017, the subnational variation in mortality rates and number of deaths of neonates, infants and children under 5 years of age within 99 low- and middle-income countries using a geostatistical survival model. We estimated that 32% of children under 5 in these countries lived in districts that had attained... 

    An innovative executive and financial mechanism for energy conservation in new and existing buildings in Iran

    , Article International Journal of Environmental Science and Technology ; Volume 17, Issue 10 , 2020 , Pages 4217-4232 Abbasizade, F ; Abbaspour, M ; Soltanieh, M ; Kani, A ; Sharif University of Technology
    Springer  2020
    One of the most effective measures for building energy conservation is the implementation of energy codes. The building energy codes introduction in Iran started two decades after the first oil crisis in the early 1970s by establishing the building energy conservation regulation called Issue 19. Nowadays, due to some financial and executive barriers, the implementation of Issue 19 is faced with some difficulties. The most critical obstacle is the low price of energy carriers, which lead to high subsidies of energy and the reluctance of the building owners to implement the regulation. The main goal of this paper is the introduction of an innovative financial and executive mechanism for... 

    Planning for groundwater sustainable use: A case study in Nishapur Plain, Iran

    , Article Agricultural Water Management ; Volume 229 , 2020 Abrishamchi, A ; Khakbazan Fard, F ; Taghavi, A ; Sharif University of Technology
    Elsevier B.V  2020
    In Iran, due to arid and semi-arid climate, groundwater resources play an essential role in food production, as well as domestic and industrial water supply. In recent years, increasing population, scarcity of surface water resources, and effects of worldwide and regional climate change have resulted in over-exploitation and unsustainability of these resources in the country. The present study aims to estimate groundwater sustainable yield, examine effects of spatial and temporal scale, and propose a plan for groundwater sustainable use in Nishapur Plain, in the north-east of Iran. In investigating the effects of spatial scale, the area of the plain is divided into several zones, with... 

    A probabilistic framework for water budget estimation in low runoff regions: A case study of the central Basin of Iran

    , Article Journal of Hydrology ; Volume 586 , 2020 Soltani, S. S ; Ataie Ashtiani, B ; Danesh Yazdi, M ; Simmons, C. T ; Sharif University of Technology
    Elsevier B.V  2020
    Utilizing ground-based measurements to obtain water budget components, especially in large scale basins, is challenging due to the limitation in the spatiotemporal availability of in-situ data. In this paper, we propose a probabilistic framework for estimating water budgets in low runoff regions using remote sensing products. By studying water budgets in the Central Basin of Iran (CBI) over 8 years period (2009–2016), we investigate the locations and time scales at which the water budget calculated from satellite products provides most closure. To this end, we use precipitation from the Tropical Rainfall Measuring Mission (TRMM), evapotranspiration from the Water Productivity Open Access... 

    Revisiting bathymetry dynamics in Lake Urmia using extensive field data and high-resolution satellite imagery

    , Article Journal of Hydrology ; Volume 603 , 2021 ; 00221694 (ISSN) Danesh Yazdi, M ; Bayati, M ; Tajrishy, M ; Chehrenegar, B ; Sharif University of Technology
    Elsevier B.V  2021
    Bathymetric mapping for an accurate estimation of stored water volume in drying lakes is a key information for an effective monitoring of their recession or restoration status. Extraction of bathymetry in shallow saline lakes using remote sensing techniques has always been challenging due to the complex influences imposed by the physical properties of substrate and the spatial variability of salinity. In this study, we developed a machine learning-based model to quantify the implicit, non-linear relationship between water depth and surface reflectance by leveraging extensive in-situ data and high-resolution satellite imagery. We trained and tested the learning model in the hyper-saline Lake... 

    Spatial-temporal assessment and redesign of groundwater quality monitoring network: A case study

    , Article Environmental Monitoring and Assessment ; Volume 172, Issue 1-4 , January , 2011 , Pages 263-273 ; 01676369 (ISSN) Owlia, R. R ; Abrishamchi, A ; Tajrishy, M ; Sharif University of Technology
    Assessment of groundwater quality monitoring networks requires methods to determine the potential efficiency and cost-effectiveness of the current monitoring programs. To this end, the concept of entropy has been considered as a promising method in previous studies since it quantitatively measures the information produced by a network. In this study, the measure of transinformation in the discrete entropy theory and the transinformation- distance (T-D) curves, which are used frequently by other researchers, are used to quantify the efficiency of a monitoring network. This paper introduces a new approach to decrease dispersion in results by performing cluster analysis that uses fuzzy... 

    Magnitude, symmetry and attenuation of upper body accelerations during walking in women: The role of age, fall history and walking surface

    , Article Maturitas ; Volume 139 , 2020 , Pages 49-56 Soleimanifar, M ; Mazaheri, M ; van Schooten, K. S ; Asgari, M ; Mosallanezhad, Z ; Salavati, M ; Sedaghat Nejad, E ; Parnianpour, M ; Sharif University of Technology
    Elsevier Ireland Ltd  2020
    Objectives: The present experiment examined the role of age and fall history in upper body accelerations when walking on an even and on an uneven surface. Study design: An observational cross-sectional study. Main outcome measures: The magnitude (root mean square [RMS]), symmetry (harmonic ratio) and attenuation (attenuation coefficient) of upper body accelerations were quantified as primary outcomes; gait spatiotemporal parameters were measured as secondary outcomes. Methods: Twenty young adults (mean ± SD age: 29.00 ± 4.51 yrs), 20 older non-fallers (66.60 ± 5.43 yrs) and 20 older fallers (68.55 ± 4.86 yrs) walked on an even and on an uneven surface, while wearing four accelerometers... 

    Mapping the spatiotemporal variability of salinity in the hypersaline Lake Urmia using Sentinel-2 and Landsat-8 imagery

    , Article Journal of Hydrology ; Volume 595 , 2021 ; 00221694 (ISSN) Bayati, M ; Danesh Yazdi, M ; Sharif University of Technology
    Elsevier B.V  2021
    The spatiotemporal dynamic of salinity concentration (SC) in saline lakes is strongly dependent on the rate of water flow into the lake, water circulation, wind speed, evaporation rate, and the phenomenon of salt precipitation and dissolution. Although in-situ observations most reliably quantify water quality metrics, the spatiotemporal distribution of such data are typically limited and cannot be readily extrapolated for either long-term projections or extensive areas. Alternatively, remotely sensed imagery has facilitated less expensive and a stronger ability to estimate water quality over a wide range of spatiotemporal resolutions. This study introduces an adaptive learning model that... 

    A state-of-the-art model for spatial and stochastic oil spill risk assessment: A case study of oil spill from a shipwreck

    , Article Environment International ; Volume 126 , 2019 , Pages 309-320 ; 01604120 (ISSN) Amir Heidari, P ; Arneborg, L ; Lindgren, J. F ; Lindhe, A ; Rosén, L ; Raie, M ; Axell, L ; Hassellöv, I. M ; Sharif University of Technology
    Elsevier Ltd  2019
    Oil spills are serious environmental issues that potentially can cause adverse effects on marine ecosystems. In some marine areas, like the Baltic Sea, there is a large number of wrecks from the first half of the 20th century, and recent monitoring and field work have revealed release of oil from some of these wrecks. The risk posed by a wreck is governed by its condition, hazardous substances contained in the wreck and the state of the surrounding environment. Therefore, there is a need for a common standard method for estimating the risks associated with different wrecks. In this work a state-of-the-art model is presented for spatial and stochastic risk assessment of oil spills from... 

    Spatiotemporal description of BTEX volatile organic compounds in a middle eastern megacity: tehran study of exposure prediction for environmental health research (Tehran SEPEHR)

    , Article Environmental Pollution ; Volume 226 , 2017 , Pages 219-229 ; 02697491 (ISSN) Amini, H ; Hosseini, V ; Schindler, C ; Hassankhany, H ; Yunesian, M ; Henderson, S. B ; Künzli, N ; Sharif University of Technology
    The spatiotemporal variability of ambient volatile organic compounds (VOCs) in Tehran, Iran, is not well understood. Here we present the design, methods, and results of the Tehran Study of Exposure Prediction for Environmental Health Research (Tehran SEPEHR) on ambient concentrations of benzene, toluene, ethylbenzene, p-xylene, m-xylene, o-xylene (BTEX), and total BTEX. To date, this is the largest study of its kind in a low- and middle-income country and one of the largest globally. We measured BTEX concentrations at five reference sites and 174 distributed sites identified by a cluster analytic method. Samples were taken over 25 consecutive 2-weeks at five reference sites (to be used for...