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- 저자 : Nematollahi (검색결과 39 건)
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Shahrzad Nematollahi1,,Mohammad Ali Mansournia,Abbas Rahimi Foroushani,Mahmood Mahmoodi,Azin Alavi,Mohammad Shekari,Kourosh Holakouie-Naieni 한국역학회 2018 Epidemiology and Health Vol.40 No.-
OBJECTIVES: Consecutive community health assessments revealed that water-pipe smoking in women and impaired growth in children were among the main health concerns in suburban communities in southern Iran. The aim of the present study was to identify the effects of water-pipe smoking during pregnancy on birth weight. METHODS: Data from a population-based prospective cohort study of 714 singleton live pregnancies in the suburbs of Bandar Abbas in southern Iran in 2016-2018 were used in this study. Data about water-pipe smoking patterns and birth weight were collected by questionnaires during and after the pregnancy. Low birth weight (LBW) was defined as a birth weight below 2,500 g. Statistical analyses were performed using generalized linear models, and the results were presented in terms of relative risk (RR) and 95% confidence intervals (CI). RESULTS: Fifty (8.2%) of the study subjects smoked water-pipe. The adjusted risk of LBW increased 2-fold in water-pipe smokers (adjusted RR [aRR], 2.09; 95% CI, 1.18 to 3.71), and by 2.0% for each 1-year increase in the duration of water-pipe smoking (aRR, 1.02; 95% CI, 0.99 to 1.05). CONCLUSIONS: Our results showed that water-pipe smoking during pregnancy was an important risk factor for LBW in this population sample from southern Iran. The introduction of regulations onto prevent water-pipe smoking and the implementation of community health action plans aiming at empowering women and increasing women’s knowledge and awareness regarding the health consequences of water-pipe smoking are proposed.
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Nematollahi, Sevil,Sokhandan-Bashir, Nemat,Rakhshandehroo, Farshad,Zamanizadeh, Hamid Reza The Korean Society of Plant Pathology 2012 Plant Pathology Journal Vol.28 No.4
Molecular characterization of Cucumber mosaic virus (CMV) was done by using samples from tomato and cucurbitaceous plants collected from different locations in the northwest region of Iran. After screening by enzyme-linked immunosorbent assay, 91 CMV-infected samples were identified. Biological properties of eight representative isolates were compared with each other revealing two distinct phenotypes on squash and tomato plants. Phylogenetic analyses based on nucleotide sequences of the coat protein (CP), movement protein (MP) and 2b of the new isolates, together with that of previously reported isolates, led to the placement of the Iranian isolates in subgroups IA and IB according to CP and MP genes, but in subgroup IA according to the 2b gene. These data suggest that reassortment may have been a major event in the evolution of CMV in Iran, and that the Iranian isolates are derived from a common recent ancestor that had passed through a bottleneck event.
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Nematollahi, Omid,Abadi, Gholamreza Bamorovat,Kim, Dae Yeon,Kim, Kyung Chun Elsevier 2018 Energy conversion and management Vol.173 No.-
<P><B>Abstract</B></P> <P>Compact-sized organic Rankine cycle (ORC) power generators require small-scale heat exchangers to achieve high power density. The objective of this study is to investigate the effect of a Brazed Metal-foam Plate Heat Exchanger (BMPHE) in an Organic Rankine Cycle (ORC) performance parameters. This evaporator is one of the first industrial full BMPHE which is composed by Nickle-foam with 25 PPI (pore per inch). In addition, a series of the experiments have been done using conventional Brazed Plate Heat Exchanger (BPHE) to make a comprehensive comparison for both cycles. Two parameters of power density and pressure gradient are introduced to make a clear comparison in addition to ORC performance parameters. Experimental data are presented for a 1-kW scroll expander and heat source temperatures between 80 and 120 °C. The results show that although the compact evaporator (BMPHE) increases the pressure drop by factors of 1.4–2.6, the overall performance of the ORC is not adversely affected, and the power density is increased by a factor of 2.5 in maximum.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel application of compact Brazed Metal-foam Plate Heat Exchanger is presented. </LI> <LI> The introduced heat exchanger is tested in an organic Rankine cycle to emphasize the size effect. </LI> <LI> The power density and pressure gradient is used for the comparison. </LI> <LI> The power density is increased by a factor of 2.5 in maximum. </LI> </UL> </P>
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A feasibility study of solar energy in South Korea
Nematollahi, Omid,Kim, Kyung Chun Elsevier 2017 RENEWABLE & SUSTAINABLE ENERGY REVIEWS Vol.77 No.-
<P><B>Abstract</B></P> <P>Through the years using renewable energies become one of the interesting issues in each country. Among the renewable energies, solar energy is more attractive. Governments planned to install more solar power plants. Feasibility study is an important step of every solar energy project. This paper investigates the feasibility of using solar energy in different regions of South Korea. For this purpose, the maximum, minimum, and average values of yearly horizontal radiation were calculated for 24 stations for a five-year period. Monthly and annual clearness indices for these stations were then calculated. The annual average horizontal radiation map and Geographic Information Systems (GIS) maps of global horizontal radiation were prepared for each month of the year. Maps were then prepared for the annual average of monthly mean clearness index for the 24 stations. Furthermore, the sunshine hours were presented for 78 stations for a three-year period. The results show that the central and southern regions of South Korea receive higher quantities of horizontal radiation, but not the northern areas.</P>
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An evaluation of wind turbine waste heat recovery using organic Rankine cycle
Nematollahi, Omid,Hajabdollahi, Zahra,Hoghooghi, Hadi,Kim, Kyung Chun Elsevier 2019 JOURNAL OF CLEANER PRODUCTION Vol.214 No.-
<P><B>Abstract</B></P> <P>Wind turbine size has increased to megawatt capacity, and the related technologies and facilities have improved, including the cooling systems. Currently, all of the heat generated by wind turbine components is wasted to the environment. This study presents a conceptual design of a novel method for waste heat recovery of a wind turbine using an organic Rankine cycle (ORC). An organic Rankine cycle is implemented to the wind turbine as a part of the cooling system. The proposed system is thermodynamically modeled to evaluate the amount of recovered energy. Seven working fluids are chosen and investigated in the simulations to estimate the working fluid effect. The results revealed that the organic Rankine cycle can be a suitable choice for cooling wind turbines while simultaneously produce the power. Both exergy and energy analysis are conducted. A maximum power of 7.1 kW is provided by the proposed system using R134 when 20 K superheat is utilized. While R600a and SE36 stand on the next place. Furthermore, a minimum of 6.25 kW power is achievable. The generated work can be used as pump driving or electricity generation. In the next step, the thermal efficiency and total annual cost are optimized simultaneously using a multi-objective optimization for R134a as best working fluid in the thermodynamic viewpoint. It is found that the ideal efficiency of the system is obtained to be 14.7% with the total price of 7050 $/year. Finally, the effects of design parameters on the efficiency are obtained.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A novel method for wind turbine cooling using organic Rankine cycles is proposed. </LI> <LI> The proposed method can produce power while is cooling the wind turbine. </LI> <LI> ORC is modeled in both energy and exergy approach with different working fluids. </LI> <LI> A multi-objective optimization is applied for economical evaluation. </LI> <LI> A 7.1 kW power is utilized through the wind turbine cooling using R134. </LI> </UL> </P>
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Behzad Nematollahi,Yen Lei Voo,Raizal Saifulnaz M. R. 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.5
Ultra-high Performance Fiber Reinforced Concrete (UHPFRC) is a new generation of cementitious based construction materialdeveloped in the mid 1990s that its unique characteristics such as high durability and impermeability, negligible shrinkage/creep andhigh impact resistance lead to almost maintenance free and direct enhancement of the life-span of a structure. UHPFRC is an ecofriendlyand environmentally green construction material which has the capacity to compete not only with conventional ReinforcedConcrete (RC) or prestressed concrete design, but it is also able to compete with conventional steel design. This paper is presented intwo parts. The first part (Part I) of this paper presents the analysis and design procedures of the precast UHPFRC cantilever retainingwalls as a sustainable alternative approach to conventional precast RC cantilever retaining walls. Further, the Environmental ImpactCalculations (EIC) of the precast UHPFRC cantilever retaining walls were compared against the conventional precast RC cantileverretaining walls as the benchmark. The second part (Part II) of this paper evaluates the reliability of the precast UHPFRC cantileverretaining walls through experimental tests on full scale UHPFRC wall specimens. The EIC results proved that cantilever retainingwalls fabricated from UHPFRC are generally more environmentally sustainable than those built of the conventional RC with respectto the reduction of CO2 emissions, Embodied Energy (EE) and Global Warming Potential (GWP). Finally, advantages of the precastUHPFRC cantilever retaining walls versus the conventional precast RC walls were presented.
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Sevil Nematollahi,Nemat Sokhandan-Bashir,Farshad Rakhshandehroo,Hamid Reza Zamanizadeh 한국식물병리학회 2012 Plant Pathology Journal Vol.28 No.4
Molecular characterization of Cucumber mosaic virus (CMV) was done by using samples from tomato and cucurbitaceous plants collected from different locations in the northwest region of Iran. After screening by enzyme-linked immunosorbent assay, 91 CMV-infected samples were identified. Biological properties of eight representative isolates were compared with each other revealing two distinct phenotypes on squash and tomato plants. Phylogenetic analyses based on nucleotide sequences of the coat protein (CP), movement protein (MP) and 2b of the new isolates, together with that of previously reported isolates, led to the placement of the Iranian isolates in subgroups IA and IB according to CP and MP genes, but in subgroup IA according to the 2b gene. These data suggest that reassortment may have been a major event in the evolution of CMV in Iran, and that the Iranian isolates are derived from a common recent ancestor that had passed through a bottleneck event.
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