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Jalili, Sina,Zamani, Jamal,Shariyat, M.,Jalili, N.,Ajdari, M.A.B.,Jafari, M. Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.5
In this article, stability of composite conical shells subjected to dynamic external pressure is investigated by numerical and experimental methods. In experimental tests, cross-ply glass woven fabrics were selected for manufacturing of specimens. Hand-layup method was employed for fabricating the glass-epoxy composite shells. A test-setup that includes pressure vessel and data acquisition system was designed. Also, numerical analyses are performed. In these analyses, effect of actual geometrical imperfections of experimental specimens on the numerical results is investigated. For introducing the imperfections to the numerical models, linear eigen-value buckling analyses were employed. The buckling modes are multiplied by very small numbers that are derived from measurement of actual specimens. Finally, results are compared together while a good agreement between results of imperfect numerical analyses and experimental tests is observed.
Sina Jalili,Jamal Zamani,M. Shariyat,N. Jalili,M.A.B. Ajdari,M. Jafari 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.5
In this article, stability of composite conical shells subjected to dynamic external pressure is investigated by numerical and experimental methods. In experimental tests, cross-ply glass woven fabrics were selected for manufacturing of specimens. Hand-layup method was employed for fabricating the glassepoxy composite shells. A test-setup that includes pressure vessel and data acquisition system was designed. Also, numerical analyses are performed. In these analyses, effect of actual geometrical imperfections of experimental specimens on the numerical results is investigated. For introducing the imperfections to the numerical models, linear eigen-value buckling analyses were employed. The buckling modes are multiplied by very small numbers that are derived from measurement of actual specimens. Finally, results are compared together while a good agreement between results of imperfect numerical analyses and experimental tests is observed.
Jalili-Kharaajoo Mahdi,Mohammadi-Milasi Rasoul Institute of Control 2005 International Journal of Control, Automation, and Vol.3 No.S
A novel neuro controller based simple neuro-structure with modified error function is introduced in this paper. This controller consists of two independent controllers, known as the voltage regulator and the angular controller. The voltage regulator is used to modify terminal voltage for the purpose of tracking a reference voltage. The angular controller is utilized to guarantee the stability of the system. In this structure each neuron uses a linear hard limit activation function that depends on the controlled variable and its derivatives. There is no need for parameter identification or any off-line training data. Two proposed controllers are merged by a smooth switch to build a complete controller. The effectiveness of the proposed novel control action is demonstrated through some computer simulations on a Single-Machine Infinite-Bus (SMIB) power system.
Zahra Jalili,Mohammad Reza Salmani Bishak,Mohammad Ali Motafakker Azad,Behzad Salmani,Jaafar Haghighat 세종대학교 경제통합연구소 2019 Journal of Economic Integration Vol.34 No.3
This study reassesses the resource-economic growth nexus by incorporating several channels. Panel time series techniques are used to analyze panel time series data from 1980 to 2015 in 31 oil-rich countries. The results show that oil rent augments economic growth; thus, oil rent is conducive for, rather than an impediment to, economic growth. The role of governance in economic growth is significant in the examined countries. Financial development is an unimportant channel in the resource-growth nexus because it is often unable to mobilize oil rent from the government to the private sector in oil-rich countries. Globalization is advantageous for countries as it promotes economic growth. Finally, war exerts a significant negative effect on growth in the long term.
Mahdi Jalili-Kharaajoo,Rasoul Mohammadi-Milasi 대한전기학회 2005 International Journal of Control, Automation, and Vol.3 No.2
A novel neuro controller based simple neuro-structure with modified error function is introduced in this paper. This controller consists of two independent controllers, known as the voltage regulator and the angular controller. The voltage regulator is used to modify terminal voltage for the purpose of tracking a reference voltage. The angular controller is utilized to guarantee the stability of the system. In this structure each neuron uses a linear hard limit activation function that depends on the controlled variable and its derivatives. There is no need for parameter identification or any off-line training data. Two proposed controllers are merged by a smooth switch to build a complete controller. The effectiveness of the proposed novel control action is demonstrated through some computer simulations on a Single-Machine Infinite-Bus (SMIB) power system.
Optimum design of truss structures under frequency constraints using hybrid CSS-MBLS algorithm
Shahin Jalili,Siamak Talatahari 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.5
Optimum design of truss structures under frequency constraints is a complicated highly non-linear optimization problem with nonconvexsolution space. In this paper, a hybrid Charged System Search (CSS) algorithm with Migration-based Local Search (MBLS)is proposed for resolving this problem. The CSS algorithm as a developed metaheuristic optimization algorithm is inspired by thegoverning laws of electrostatics in physics and the governing laws of motion from the Newtonian mechanics. In the proposed hybridCSS-MBLS algorithm, the convergence speed of the standard CSS algorithm is enhanced by the MBLS mechanism. Numericalresults obtained from some design examples reveal the successfulness and effectiveness of the proposed algorithm in solving trussoptimum design problem under frequency constraints.
Genistein improve nicotine toxicity on male mice pancreas
Mohammad Reza Salahshoor,Fatemeh Mirzaei,Shiva Roshankhah,Parnian Jalili,Cyrus Jalili 대한해부학회 2019 Anatomy & Cell Biology Vol.52 No.2
Nicotine is the most toxic factor of tobacco. Genistein is a phytoestrogen and antioxidant that has numerous health benefits. The aim of this study is to evaluate the effects of genistein against toxic properties of nicotine to the pancreas of mice. For this purpose, 48 male mice were randomly assigned into six groups (n=8): normal control, nicotine control (2.5mg/kg), genistein (25 and 50 mg/kg), and nicotine+genistein (25 and 50 mg/kg) treated groups. Various doses of genistein and genistein+nicotine were administered intraperitoneally to animals for 4 weeks. The weight of pancreas, total antioxidant capacity and nitrite oxide of serum, insulin levels, and the number and diameter of islets of Langerhans were investigated. Nicotine administration reduced significantly total antioxidant capacity, insulin, pancreas weight, and the number and diameter of islets of Langerhans and increased nitrite oxide in serum compared to the control normal group (P<0.05). Conversely, genistein and genistein+nicotine increased significantly insulin, total antioxidant capacity, and the number and diameter islets of Langerhans and decreased serum nitrite oxide compared to the nicotine control group. It seems that the genistein can improve pancreas damage following the nicotine administration.
Kim, Hyunsoo,Jalili, Rouhollah,Spinks, Geoffrey M.,Wallace, Gordon G.,Kim, Seon Jeong Elsevier 2017 Composites science and technology Vol.149 No.-
<P><B>Abstract</B></P> <P>Carbon fibers are well-known reinforcing elements in advanced composites, but these materials remain expensive partly due to the complex processing methods used to form high strength and high modulus fibers. Graphene is seen as an alternative precursor for the formation of high strength carbon-based fibers. Here it is shown that the strength and modulus of graphene-based fibers are enhanced by incorporating a polyacrylonitrile (PAN) binder, surface coating with polydopamine (PDA) and through appropriate pyrolysis heat treatments. Fiber samples were prepared by a wet-spinning method such that the composition of liquid-crystalline graphene oxide (LCGO) and PAN could be varied over the full range. The maximum fiber mechanical strength (220 MPa) and modulus (19 GPa) occurred at a composition of LCGO (80 wt%) and PAN (20 wt%). The mechanical strength was further significantly increased to 526 MPa through pyrolysis of the LCGO/PAN fiber at 800 °C in a nitrogen atmosphere which caused carbonization of PAN. In addition, surface treatment of the LCGO/PAN fiber with PDA before carbonization improved the mechanical strength by an additional 40%.</P>
Radmand, Fereshteh,Jalili, Aref The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.6
This paper presents a new high step-up dc/dc converter for renewable energy systems in which a high voltage gain is provided by using a coupled inductor. The operation of the proposed converter is based on a charging capacitor with a single power switch in its structure. A passive clamp circuit composed of capacitors and diodes is employed in the proposed converter for lowering the voltage stress on the power switch as well as increasing the voltage gain of the converter. Since the voltage stress is low in the provided topology, a switch with a small ON-state resistance can be used. As a result, the losses are decreased and the efficiency is increased. The operating principle and steady-states analyses are discussed in detail. To confirm the viability and accurate performance of the proposed high step-up dc-dc converter, several simulation and experimental results obtained through PSCAD/EMTDC software and a built prototype are provided.