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Zehtab, Behnam,Tarighat, Amir Techno-Press 2016 Advances in concrete construction Vol.4 No.4
Porous materials such as concrete could be subjected to aggressive ions transport. Durability of cement paste is extremely depended on water and ions penetration into its interior sections. These ions transport could lead different damages depending on reactivity of ions, their concentrations and diffusion coefficients. In this paper, chloride diffusion process in cement hydrates is simulated at atomistic scale using molecular dynamics. Most important phase of cement hydrates is calcium silicate hydrate (C-S-H). Tobermorite, one of the most famous crystal analogues of C-S-H, is used as substrate in the simulation model. To conduct simulation, a nanopore is considered in the middle of simulation cell to place water molecules and aggressive ions. Different chloride salts are considered in models to find out which one is better for calculation of the transport properties. Diffusion coefficients of water molecules and chloride ions are calculated and validated with existing analytical and experimental works. There are relatively good agreements among simulation outputs and experimental results.
Effective Work Function of Screen Printable Graphene-Decorated Conductive Nanocomposites
N. Bakhshizadeh,R. S. Tarighat,S. Sivoththaman 한국전기전자재료학회 2020 Transactions on Electrical and Electronic Material Vol.21 No.6
Printable electrodes will play an important role in future fl exible electronics in photovoltaic, displays, and sensor devices. Novel materials such as nanocomposites can be attractive as electrode materials in such devices. Work function is an important parameter in the design of device structures for optimal performance. However, defi nition of work function of nanocomposite materials is complicated due to their non-homogeneity compared to single phase materials. In this study, an effective work function of a novel screen-printable graphene-decorated nanocomposite is presented. Two methods were used to determine the eff ective work function. The fi rst method relies on the tunneling current in a conductor–insulator–conductor structure with the nanocomposite functioning as one of the conductors, while the second method measures the work function of the nanocomposite at the interface with vacuum using ultraviolet photoemission spectroscopy. Values measured using the two methods are in a fairly good agreement. The diff erence is believed to be due to the heterogeneous nature of this nanocomposite which invites for the defi nition of an eff ective value for the work function, which will be a key parameter in the design of practical devices with nanocomposite electrodes.
Numerical and analytical study of aeroelastic characteristics of wind turbine composite blades
Ahmad Reza Ghasemi,Arezu Jahanshir,Mohammad Hassan Tarighat 한국풍공학회 2014 한국풍공학회지 Vol.18 No.2
Aeroelasticity is the main source of instability in structures which are subjected to aerodynamic forces. One of the major reasons of instability is the coupling of bending and torsional vibration of the flexible bodies, which is known as flutter. The presented investigation aims to study the aeroelastic stability of composite blades of wind turbine. Geometry, layup, and loading of the turbine blades made of laminated composites were calculated and evaluated. To study the flutter phenomenon of the blades, two numerical and analytical methods were selected. The finite element method (FEM), and JAR-23 standard were used to perform the numerical studies. In the analytical method, two degree freedom flutter and Lagrange\'s equations were employed to study the flutter phenomena analytically and estimate the flutter speed.
Numerical and analytical study of aeroelastic characteristics of wind turbine composite blades
Ghasemi, Ahmad Reza,Jahanshir, Arezu,Tarighat, Mohammad Hassan Techno-Press 2014 Wind and Structures, An International Journal (WAS Vol.18 No.2
Aeroelasticity is the main source of instability in structures which are subjected to aerodynamic forces. One of the major reasons of instability is the coupling of bending and torsional vibration of the flexible bodies, which is known as flutter. The presented investigation aims to study the aeroelastic stability of composite blades of wind turbine. Geometry, layup, and loading of the turbine blades made of laminated composites were calculated and evaluated. To study the flutter phenomenon of the blades, two numerical and analytical methods were selected. The finite element method (FEM), and JAR-23 standard were used to perform the numerical studies. In the analytical method, two degree freedom flutter and Lagrange's equations were employed to study the flutter phenomena analytically and estimate the flutter speed.
Monireh Dahri,Atefeh Sarafan Sadeghi,Naseh Pahlavani,Elyas Nattagh-Eshtivani,Mazyar Hashemilar,Mohammad Asghari-Jafarabadi,Hanieh Barghchi,Ali Tarighat-Esfanjani 한국임상영양학회 2023 Clinical Nutrition Research Vol.12 No.4
Migraine is a common neurological disease correlated with oxidative stress and lipid profile disorders. The present study was designed to determine the effects of Coenzyme Q10 (Co-Q10) supplementation on oxidative status and lipid profile in migraine individuals. This clinical trial was conducted on 84 females aged 18–50 years, diagnosed for episodic migraine according to the International Headache Society. Subjects were randomized to receive either Co-Q10 supplement (400 mg/day) or placebo for 12 weeks. Lipid profile and oxidative stress indices including malondialdehyde (MDA) and total antioxidant capacity (TAC) were measured before and after intervention in both groups. Also, anthropometric indices, dietary intakes, and clinical features were collected. Data analysis was conducted using SPSS version 16. Seventy seven of the participants, with mean age of 33.70 ± 7.75 years, completed the study. After 12-week intervention, Co-Q10 led to a significant decrease in MDA levels compared to placebo (p = 0.009), with no effect on TAC levels (p = 0.106). A significant increase in serum Co-Q10 concentration and high-density lipoprotein cholesterol (HDL-C) level in Co-Q10 group was observed, but no significant differences were found in other lipid profile variables (low-density lipoprotein cholesterol, triglycerides and total cholesterol). Among anthropometric variables, Co-Q10 only caused a significant reduction in body fat percentage (BFP), but we did not find any significant changes in others. A 12-week Co-Q10 supplementation led to significant improvement in clinical features, BFP, and HDL-C level among migraine individuals.