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In this paper Type I FGM cylindrical shell has Nickel on its inner surface and stainless steel on its outer surface and Type II FGM cylindrical shell has stainless steel on its inner surface and nickel on its outer surface. The study is carried out based on third order shear deformation shell theory. The objective is to study the natural frequencies, the influence of constituent volume fractions and the effects of configurations of the constituent materials on the frequencies. The properties are graded in the thickness direction according to the volume fraction power-law distribution. The governing equations are obtained using energy functional with the Hamilton's principle. The boundary conditions in this cylindrical shell made of two material is Free-simply support (F-SS). Results are presented on the frequency characteristics, the influence of the constituent various volume fractions on the frequencies for a Type I, II FGM cylindrical shell. © 2011 Praise Worthy Prize S.r.l. - All rights reserved. Source


Moradivalikboni R.,Academy of Sciences of Tajikistan | Hozhiboevy Y.,Academy of Sciences of Tajikistan | Heidarnezhad Z.,Islamic Azad University at Andimeshk
Oriental Journal of Chemistry | Year: 2013

The synthesis of 2-R 5-oxo 5-H 6 -carbohydrazin 7-phenyl 1,3,4-thiadiazolo-[3,2-a] pyrimidine is described. This compound exhibits a broad spectrum of antimicrobial action and can be useful in the search for new antimicrobial drugs.Reactions of 2- R 5 - Oxo 5-H 6- EthylCarboxilate 7-phenyl -1, 3,4 - Thiadiazolo-[3,2-a] pyrimidine with hydrazine produce 2-R 5-oxo 5-H 6 -carbohydrazin 7-phenyl 1,3,4-thiadiazolo-[3,2-a] pyrimidine. The structures of the compounds obtained are set NMR, 13C, IR- spectroscopy. Source


Isvandzibaei M.R.,Islamic Azad University at Andimeshk
International Review of Mechanical Engineering | Year: 2011

In the present work, study of the vibration of thin cylindrical shells made of a functionally gradient material (FGM) composed of stainless steel and nickel is presented. Material properties are graded in the thickness direction of the shell according to volume fraction power law distribution. The objective is to study the natural frequencies, the influence of constituent volume fractions and the effects of boundary conditions on the natural frequencies of the FG cylindrical shell. The study is carried out using third order shear deformation shell theory. The analysis is carried out using Hamilton's principle. The governing equations of motion of FG cylindrical shells are derived based on shear deformation theory. Results are presented on the frequency characteristics, influence of constituent volume fractions and the effects of clampedsimply boundary conditions. © 2011 Praise Worthy Prize S.r.l. - All rights reserved. Source


Study of the vibration of thin cylindrical shells made of a functionally gradient material (FGM) composed of stainless steel and nickel is very important. The objective is to study the natural frequencies and the effects clamped-clamped boundary conditions on the natural frequencies of the functionally graded cylindrical shell. The study is carried out using third order shear deformation shell theory. The properties are graded in the thickness direction according to the volume fraction power-law distribution. The governing equations are obtained using energy functional with the Rayleigh-Ritz method. The governing equations of motion of functionally graded cylindrical shells are derived based on third order shear deformation shell theory. Results are presented on the frequencies characteristics and the effects of clamped-clamped boundary conditions on edge end functionally graded cylindrical shell. © 2011 Praise Worthy Prize S.r.l. All rights reserved. Source


Setareh M.,Islamic Azad University at Andimeshk
World Academy of Science, Engineering and Technology | Year: 2011

Machining process sometimes carried out on plastic pieces with the purpose of maintaining, completing, changing and dimensional accuracy. For machining process of plastics include milling, plane cutting head, form cutting, it is advised that tools with ability to resist against increase of temperature and perform at high speed were used to establish appropriate surface quality. An important point in machining process on plastics is their weakness in conductivity of heat resulted from friction between cutting edge and contact surface of work piece so, some changes and adjustment should be done on machining parameters such as cutting speed, advance rate and specially geometry and kind of the tools for achieving desired surface quality. In this method we seek appropriate tools for expressing surface smoothness in a desired manner. So, some experiments were done on a CNC milling tool with axial strength 18 KW and maximum axial speed of 4500 rpm. At first, empirical experiment is conducted using H.S.S tools and after that by carbide tools. Kind of Teflon piece (PTFE) and parameters such as advance rate, cutting depth and coolant material were considered as constant variables. Roughness tester was used for measuring the surface smoothness. Findings resulted from models were compared and examined that which model have higher accuracy we achieve more accurate model for expressing surface smoothness. Finally, we showed the effects of H.S.S and carbide tools on surface smoothness obtained using some models and forms. Source

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