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Mohammad Hosein Nili,Banafsheh Zahraie,Hosein Taghaddos 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.26 No.4
Effective bridge maintenance reduces bridge operation costs and extends its service life. The possibility of storing bridge life-cycle data in a 3D parametric model of the bridge through Bridge Information Modeling (BrIM) provides new opportunities to enhance current practices of bridge maintenance management. This study develops a Decision Support System (DSS), namely BrDSS, which employs BrIM and an efficient optimization model for bridge maintenance planning. The BrIM model in BrDSS extracts basic data of elements required for the optimization process and visualizes the inspection data and the optimization results to the user to help in decision makings. In the optimization module of the DSS, the specifically formulated Genetic Algorithm (GA) eliminates the chances of producing infeasible solutions for faster convergence. The practicality of the presented DSS was explored by utilizing the DSS in the maintenance planning of a bridge under operation in the southwest of Iran.
Ali Madadi,Mohammad Jafar Kermani,Mahdi Nili-Ahmadabadi 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
An inverse design algorithm, called the ball-spine (BS) algorithm, is developed for the design of axial flow compressor blades. Thisalgorithm has been previously applied to the design of 2D sharp leading edge airfoils. In the present study, the BS algorithm is extendedto the design of blunt leading edge compressor blade sections. The algorithm receives a target pressure loading and an initial guess for itsgeometry. Through the design procedure, the geometry is evolved until the target pressure is achieved. The accuracy of the method isassessed against two airfoils, namely, NACA65-410 (with the initial guess for geometry as a flat-plate-airfoil) and NACA65-610 (withthe initial guess for geometry as NACA65-410). The method is shown to be efficient and accurate, and can capture the target geometry inapproximately 50 evolutions. As an application, a new airfoil with 5% more lift than NACA65-610 is designed, for which NACA65-610geometry is used as the initial guess.
Development and Microstructural Characterization of a New Wrought High Entropy Superalloy
Ahad Shafiee,Mahmoud Nili‑Ahmadabadi,Hyoung Seop Kim,Mohammad Jahazi 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.5
In this study, a newly developed γ′ precipitation hardened high entropy superalloy (designated as HES-A1 hereafter) wasproduced and its microstructural features were characterized. The new alloy composition is based on the major elementsof conventional IN718 alloy, however other elements were added or removed to minimize possible presence of δ (or γʺ)phase and increase the volume fraction of very fine γ′ precipitates instead. Broadening the hot working window, lowerdensity, and avoiding the use of expensive elements were other considerations taken into account in the design of the newalloy. CALPHAD (CALculation of PHAse Diagrams) and PhaComp methods were used for the prediction of phases andtheir evolutions. The microstructure of the HES-A1 alloy in as-cast, homogenized, hot rolled, annealed and aged conditionswere characterized using optical, scanning, and transmission electron microscopes as well as X-ray diffraction technique. The as-cast microstructure of HES-A1 contained 5.5% of Laves phase, which was reduced to less than 0.3% through thedevelopment of a homogenization treatment. Hot rolling with reductions up to 36% at 1015 °C did not produce any cracking,indicating a good forming potential for the new alloy. The application of double aging treatment, similar to the one forIN718 alloy, showed no presence of γʺ or formation of δ phase in the microstructure. HES-A1 has been designed with ahigher Al/(Ti + Nb) ratio and higher proportion of Al + Ti + Nb so that it could be mainly strengthened by γ′ precipitation. The average size of monomodal γ′ precipitates was smaller than that observed in conventional alloys after similar treatments.
A Novel Approach for Energy Harvesting from Feedback Fluidic Oscillator
Masoud Alikhassi,Mahdi Nili-Ahmadabadi,Reza Tikani,Mohammad Hassan Karimi 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.4
Piezoelectric patches are widely used on a micro scale energy harvesting due to their simplicity and high flexibility. In this study a fluidic oscillator was used to effectively convert the kinetic energy of a fluid into the strain energy of the piezoelectric structure. The relationship between the input velocity and the frequency of fluid fluctuations in the fluidic oscillator was obtained and different positions for the piezoelectric beam and the effect of the input velocity on the output voltage was examined. The optimum electrical resistance was finally calculated for the maximum harvested power and the pressure drop caused by the fluidic oscillator and piezoelectric beam was investigated. The results indicated when the free end of the beam was inside the main chamber of oscillator, the beam fluctuates with its natural frequency so that the fluid oscillations frequency is close to the natural frequency at different velocity. However, when the free end of the beam was outside the main chamber, the voltage and power were maximized at the frequency of fluid oscillation equal to the natural frequency of the piezoelectric beam.
방사선과 수은에 의해 유도된 Eisenia fetida 체강세포의 DNA 손상 및 수복 평가
류태호 ( Tae Ho Ryu ),모하마드닐리 ( Mohammad Nili ),안광국 ( Kwang Guk An ),김진규 ( Jin Kyu Kim ) 한국환경생물학회 2011 환경생물 : 환경생물학회지 Vol.29 No.1
The single cell gel electrophoresis (SCGE) assay is a microelectrophoretic technique for assessments of DNA damage at the level of the individual eukaryotic cell. The SCGE assay, due to its simplicity, sensitivity and need of a few cells, has advantages compared to other genomic damage assays such as sister chromatid exchange, chromosomal aberration and micronucleus test. In this study, investigated were the levels of DNA damage and the repair kinetics in the coelomocytes of Eisenia fetida treated with HgCl2 and ionizing radiation by means of the SCGE assay. For detecting DNA damage and repair in coelomocytes, earthworms (E. fetida) were irradiated with six doses of γ-rays (0, 2.5, 5, 10, 20 and 50 Gy) and in vivo exposed to mercuric chloride at 0, 80 and 160 mg kg-1 for 48 hours. Then the Olive tail moments were measured during 0~12 hours after irradiation and 0~72 hours after Hg treatment. The results showed that the more the oxidative stress was induced by mercury and radiation, the longer the repair time was required. Also, the results suggest that the SCGE assay may be used as an important tool for comparison of the sensitivity of different species to oxidative stresses.
염화수은(2)과 이온화 방사선 처리에 따른 토양 내 환형동물의 DNA 손상 측정
류태호 ( Tae Ho Ryu ),모하마드닐리 ( Mohammad Nili ),안광국 ( Kwang Guk An ),김진규 ( Jin Kyu Kim ) 한국환경생물학회 2010 환경생물 : 환경생물학회지 Vol.28 No.4
Soil pollution by heavy metals has become a significant environmental concern due to a variety of human activities. Specially toxicity caused by excessive mercury exposure is now being recognized as a widespread environmental problem and is continuing to attract a great deal of public concerns. The earthworms are very important animals that aerate the soil with their burrowing action and enrich the soil by decomposing organic matters. Especially the earthworm Eisenia fetida is routinely used in ecotoxicological studies. The levels of DNA damage in earthworms treated with HgCl2 and ionizing radiation were investigated in this study. Genotoxic effects were evaluated in the earthworm`s coelomocytes using the comet assay (Single Cell Gel Electrophoresis; SCGE). The results showed that the mercury chloride and radiation were responsible for the genotoxic effects on earthworms. The level of DNA damage significantly increased after the treatment of mercury chloride combined with ionizing radiation. The combined treatment of HgCl2 and ionizing radiation had a greater genotoxicity. This study is amenable to further study such as enzyme activation assay.