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Analysis of Airborne Particulate Matter Toxicity and its Origin
, M.Sc. Thesis Sharif University of Technology ; Erhami, Mohammad (Supervisor)
Abstract
Epidemiological studies have shown a positive association between particulate matters exposure and adverse health effects. However, the insufficient knowledge about the influences of components or characteristics of these particles on their health effects and toxicity leads into inefficient control practices for reducing particulates health effects. So, relationship between particles toxicity and their emission sources and components is a valuable criterion in particle emission control strategies. Moreover, as people spend most of their time in indoor environment, investigating the main sources and components of particulate toxicity in indoor environment and finding the influence of outdoor...
Nonlinear robust control of air handling units to improve the indoor air quality & CO2 concentration: A comparison between H∞ & decoupled sliding mode controls
, Article Applied Thermal Engineering ; Volume 160 , 2019 ; 13594311 (ISSN) ; Moradi, H ; Alasty, A ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
Air-handling units (AHUs) are the installations responsible for the control of temperature and humidity inside a space using the heating, cooling, humidifier and drying air components. In this research, a multivariable nonlinear dynamic model of the AHU with one zone in the VAV (variable air volume) system for working in the summer is considered. The indoor temperature, relative humidity and carbon dioxide concentration are controlled via manipulation of the valve positions of the air flow rate, cold water flow rate and fresh air percent. Due to the complexity and nonlinearity of AHU model and also the existence of various operating points and uncertainty, model uncertainties are included....
On the operating rooms ventilation system
, Article 12th International Conference on Indoor Air Quality and Climate 2011 ; Volume 4 , 2011 , Pages 3194-3199 ; 9781627482721 (ISBN) ; Ahmadi, G ; Saidi, M. H ; Sharif University of Technology
Abstract
Surgical site infection (SSI) is one of the important infectious problems in hospitals. It is well known that appropriate ventilation strategy is most effective way to control bacteria-carrying airborne particles responsible for SSI. With considerable improvement in the computational capacity of computers, computational fluid dynamics (CFD) technique has been widely used to study the indoor airflow and contaminant dispersion over the enclosures. In this research, the effect of inlet air velocity on the ultra-clean ventilation system performance is investigated Eulerian-Lagrangian numerical approach. The results show that surgical wound contamination may be highly affected by inlet velocity....
Numerical investigation of the swirling air diffuser: Parametric study and optimization
, Article Energy and Buildings ; Volume 43, Issue 6 , June , 2011 , Pages 1329-1333 ; 03787788 (ISSN) ; Saidi, M. H ; Mohebbian, A ; Sharif University of Technology
2011
Abstract
During the recent decade, high induction diffusers have become more appealing in applications which require relatively high ventilation airflow rates, such as clean rooms. In this research, the effect of geometric parameters on the performance of a specific type of swirling air diffuser is investigated numerically. The results show that although the diffuser slots geometry, namely their angle and aspect ratio, is impressive on the diffuser performance, it is not as important as the swirling blade angle and the performance is almost constant in a wide range of slots specifications. The results also demonstrate that the diffuser performance and the resultant indoor airflow distribution highly...
The effect of source motion on contaminant distribution in the cleanrooms
, Article Energy and Buildings ; Volume 43, Issue 4 , April , 2011 , Pages 966-970 ; 03787788 (ISSN) ; Sajadi, B ; Molaeimanesh, G. R ; Sharif University of Technology
2011
Abstract
In the recent decades, cleanrooms have found growing applications in broad range of industries such as pharmacy and microelectronics. Concerns about negative effects of the contaminant exposure on the human health and product quality motivate many researchers towards understanding of the airflow and contaminant distribution though these environments. With an improvement in computational capacity of the computers, computational fluid dynamics (CFD) technique has become a powerful tool to study the engineering problems including indoor air quality (IAQ). In this research, indoor airflow in a full-scale cleanroom is investigated numerically using Eulerian-Eulerian approach. To evaluate the...
A new approach to exergy analyses of a hybrid desiccant cooling system compares to a vapor compression system
, Article Applied Mechanics and Materials, 29 July 2011 through 31 July 2011 ; Volume 110-116 , July , 2012 , Pages 2163-2169 ; 16609336 (ISSN) ; 9783037852620 (ISBN) ; Yau, Y. H ; Mahlia, T. M. I ; Saidi, M. H ; Sharif University of Technology
Abstract
In the recent researches HVAC with a based desiccant dehumidifier with a low ambient impact is more efficient in comparison to the traditional systems. Hybrid desiccant cooling systems can be used to control indoor air quality in buildings. This paper presents an integrated energy, entropy and exergy analysis of a hybrid desiccant cooling system compare to a compression system based on first and second laws of thermodynamic. The main objective is the use of a method called exergy costing applied to a conventional compression system that has been chosen to provide the proper conditioned air for a building in hot and humid condition. By applying the same method for the equivalent hybrid...
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 ; 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
Abstract
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...
Characterization of PAHs and metals in indoor/outdoor PM10 /PM2.5 /PM1 in a retirement home and a school dormitory
,
Article
Science of the Total Environment
;
Volume 527-528
,
September
,
2015
,
Pages 100-110
;
00489697 (ISSN)
; Naddafi, K
; Faridi, S
; Nabizadeh, R
; Sowlat, M. H
; Momeniha, F
; Gholampour, A
; Arhami, M
; Kashani, H
; Zare, A
; Niazi, S
; Rastkari, N
; Nazmara, S
; Ghani, M
; Yunesian, M
;
Sharif University of Technology
Elsevier
2015
Abstract
In the present work, we investigated the characteristics of polycyclic aromatic hydrocarbons (PAHs) and metal(loid)s in indoor/outdoor PM10 , PM2.5 , and PM1 in a retirement home and a school dormitory in Tehran from May 2012 to May 2013. The results indicated that the annual levels of indoor and outdoor PM10 and PM2.5 were much higher than the guidelines issued by the World Health Organization (WHO). The most abundant detected metal(loid)s in PM were Si, Fe, Zn, Al, and Pb. We found higher percentages of metal(loid)s in smaller size fractions of PM. Additionally, the results showed that the total PAHs (ΣPAHs) bound to PM were...
Short-term effects of particle size fractions on circulating biomarkers of inflammation in a panel of elderly subjects and healthy young adults
, Article Environmental Pollution ; Volume 223 , 2017 , Pages 695-704 ; 02697491 (ISSN) ; Naddafi, K ; Kashani, H ; Faridi, S ; Kunzli, N ; Nabizadeh, R ; Momeniha, F ; Gholampour, A ; Arhami, M ; Zare, A ; Pourpak, Z ; Hoseini, M ; Yunesian, M ; Sharif University of Technology
Abstract
Systemic inflammation biomarkers have been associated with risk of cardiovascular morbidity and mortality. We aimed to clarify associations of acute exposure to particulate matter (PM10(PM < 10 μm), PM2.5-10(PM 2.5–10 μm), PM2.5(PM < 2.5 μm), PM1-2.5(PM 1–2.5 μm), and PM1 (PM < 1 μm)) with systemic inflammation using panels of elderly subjects and healthy young adults. We followed a panel of 44 nonsmoking elderly subjects living in a retirement home and a panel of 40 healthy young adults living in a school dormitory in Tehran city, Iran from May 2012 to May 2013. Blood biomarkers were measured one every 7–8 weeks and included white blood cells (WBC), high sensitive C-reactive protein...
Association of biomarkers of systemic inflammation with organic components and source tracers in quasi-ultrafine particles
, Article Environmental Health Perspectives ; Volume 118, Issue 6 , 2010 , Pages 756-762 ; 00916765 (ISSN) ; Staimer, N ; Tjoa, T ; Arhami, M ; Polidori, A ; Gillen, D. L ; Kleinman, M. T ; Schauer, J. J ; Sioutas, C ; Sharif University of Technology
2010
Abstract
Background: Evidence is needed regarding the air pollutant components and their sources responsible for associations between particle mass concentrations and human cardiovascular outcomes. We previously found associations between circulating biomarkers of inflammation and mass concentrations of quasi-ultrafine particles ≤ 0.25 μm in aerodynamic diameter (PM0.25) in a panel cohort study of 60 elderly subjects with coronary artery disease living in the Los Angeles Basin.Objectives: We reassessed biomarker associations with PM0.25 using new particle composition data.Methods: Weekly biomarkers of inflammation were plasma interleukin-6 (IL-6) and soluble tumor necrosis factor-α receptor II...
Influence of indoor air conditions on radon concentration in a detached house
, Article Journal of Environmental Radioactivity ; Volume 116 , February , 2013 , Pages 166-173 ; 0265931X (ISSN) ; Mahmoudi, J ; Ghanbari, M ; Sharif University of Technology
2013
Abstract
Radon is released from soil and building materials and can accumulate in residential buildings. Breathing radon and radon progeny for extended periods hazardous to health and can lead to lung cancer. Indoor air conditions and ventilation systems strongly influence indoor radon concentrations. This paper focuses on effects of air change rate, indoor temperature and relative humidity on indoor radon concentrations in a one family detached house in Stockholm, Sweden.In this study a heat recovery ventilation system unit was used to control the ventilation rate and a continuous radon monitor (CRM) was used to measure radon levels. FLUENT, a computational fluid dynamics (CFD) software package was...