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Optimization of composite pressure vessels with metal liner by adaptive response surface method
Abbas Vafaeesefat 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.11
This paper presents a new strategy to optimize composite pressure vessels with metallic liners using an adaptive response surface method. Finite analysis is used to evaluate the fitness function and constraints. To reduce the computation time, the proposed algorithm creates the response surface (RS) model to find the optimum design. To improve the accuracy of the RS model, the design domain is iteratively reduced and new sample points are added to the RS model. In this way, the accuracy of the RS model is improved close to the optimum point. The genetic algorithm is used to find the reduced design domain and to generate new sample points. The optimization algorithm is first applied to a highly nonlinear function to evaluate its efficiency. It is then used to find the optimal design for a composite pressure vessel with a metallic liner.
Abbas Shokri,Amir Eskandarloo,Maruf Noruzi-Gangachin,Samira Khajeh 대한치과보존학회 2015 Restorative Dentistry & Endodontics Vol.40 No.1
Objectives: This study aimed to compare the accuracy of conventional intraoral (CI) radiography, photostimulable phosphor (PSP) radiography, cone beam computed tomography (CBCT) and multidetector computed tomography (MDCT) for detection of strip and root perforations in endodontically treated teeth. Materials and Methods: Mesial and distal roots of 72 recently extracted molar were endodontically prepared. Perforations were created in 0.2, 0.3, or 0.4 mm diameter around the furcation of 48 roots (strip perforation) and at the external surface of 48 roots (root perforation); 48 roots were not perforated (control group). After root obturation, intraoral radiography, CBCT and MDCT were taken. Discontinuity in the root structure was interpreted as perforation. Two observers examined the images. Data were analyzed using Stata software and Chi-square test. Results: The sensitivity and specificity of CI, PSP, CBCT and MDCT in detection of strip perforations were 81.25% and 93.75%, 85.42% and 91.67%, 97.92% and 85.42%, and 72.92% and 87.50%, respectively. For diagnosis of root perforation, the sensitivity and specificity were 87.50% and 93.75%, 89.58% and 91.67%, 97.92% and 85.42%, and 81.25% and 87.50%, respectively. For detection of strip perforation, the difference between CBCT and all other methods including CI, PSP and MDCT was significant (p < 0.05). For detection of root perforation, only the difference between CBCT and MDCT was significant, and for all the other methods no statistically significant difference was observed. Conclusions: If it is not possible to diagnose the root perforations by periapical radiographs, CBCT is the best radiographic technique while MDCT is not recommended.
Abbas Najati,G. Zamani Eskandani,박춘길 대한수학회 2009 대한수학회보 Vol.46 No.1
In this paper, we investigate homomorphisms in proper JCQ^{*}-triples and derivations on proper JCQ^{*}-triples associated to the following Pexiderized functional equation [f(x+y+z) = f_{0}(x)+ f_{1}(y)+f_{2}(z)]. This is applied to investigate homomorphisms and derivations in proper JCQ^{*}-triples. In this paper, we investigate homomorphisms in proper JCQ^{*}-triples and derivations on proper JCQ^{*}-triples associated to the following Pexiderized functional equation [f(x+y+z) = f_{0}(x)+ f_{1}(y)+f_{2}(z)]. This is applied to investigate homomorphisms and derivations in proper JCQ^{*}-triples.
Abbas, Mohamed,Torati, Sri Ramulu,Rao, B. Parvatheeswara,Abdel-Hamed, M.O.,Kim, CheolGi Elsevier 2015 JOURNAL OF ALLOYS AND COMPOUNDS Vol.644 No.-
<P><B>Abstract</B></P> <P>Monodisperse Mn<I> <SUB>x</SUB> </I>Zn<SUB>1−</SUB> <I> <SUB>x</SUB> </I>Fe<SUB>2</SUB>O<SUB>4</SUB> (<I>x</I> =0.2, 0.5 and 0.8) nanoparticles have been synthesized using two different routes namely sonochemical and polyol methods, and the shape and size along with physiochemical properties of the nanoparticles were compared in detail. In both the routes, the synthesis was performed in a single reaction without the use of any surfactant and deoxygenated conditions. The reaction kinetics and surface adsorption characteristics of nanoparticles were observed by thermogravimetric analysis and Fourier transform infrared spectroscopy measurements. X-ray diffraction patterns confirmed the formation of a pure ferrite phase with cubic spinel structure, and the patterns further clearly indicate that the sonochemical method produces highly crystalline particles without any post calcination reaction, comparing with the polyol process. Transmission electron microscopy results reveal that the nanoparticles synthesized by polyol method are mostly aggregated and spherical in nature whereas the nanoparticles produced by sonochemical method are monodisperse large particles with cubic like shapes. The overall studies demonstrated that the sonochemical method is facile, reliable, rapid and very attractive for the aqueous synthesis of highly crystalline and high magnetic moment (84.5emu/g) monodisperse superparamagnetic Mn–Zn ferrite nanoparticles which considered as potential materials for various applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mn–Zn ferrite NPs were synthesized by two different methods are polyol and sonochemical. </LI> <LI> The sonochemical method produced NPs with high crystallinity than polyol method. </LI> <LI> The ferrite samples synthesized by sonochemical method showed high magnetization values and superparamagnetic properties. </LI> <LI> XRD, TEM, EDS, TGA, FTIR, and VSM techniques used to characterize the samples. </LI> </UL> </P>
Abbas, Muhammad A.,Basit, Muhammad A.,Park, Tae Joo,Bang, Jin Ho The Royal Society of Chemistry 2015 Physical chemistry chemical physics Vol.17 No.15
<P>Despite the potential of PbS quantum dots (QDs) as sensitizers for quantum-dot-sensitized solar cells (QDSSCs), achieving a high photocurrent density over 30 mA cm<SUP>−2</SUP> remains a challenging task in PbS-sensitized solar cells. In contrast to previous attempts, where Hg<SUP>2+</SUP>-doping or multi-step post-treatment is necessary, we are capable of achieving a high photocurrent exceeding 30 mA cm<SUP>−2</SUP> simply by manipulating the successive ionic layer adsorption and reaction (SILAR) method. We show that controlling temperature at which SILAR is performed is critical to obtain a higher and more uniform coverage of PbS QDs over a mesoporous TiO<SUB>2</SUB> film. The deposition of a CdS inter-layer between TiO<SUB>2</SUB> and PbS is found to be an effective means of ensuring high photocurrent and stability. Not only does this modification improve the light absorption capability of the photoanode, but it also has a significant effect on charge recombination and electron injection efficiency at the PbS/TiO<SUB>2</SUB> interface according to our in-depth study using electrochemical impedance spectroscopy (EIS). The implication of subtle changes in the interfacial events <I>via</I> modified SILAR conditions for PbS-sensitized solar cells is discussed.</P> <P>Graphic Abstract</P><P>The performance of PbS-sensitized solar cells is significantly improved by controlling successive ionic layer adsorption and reaction. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cp00941c'> </P>
Jordan θ-derivations on Lie triple systems
Abbas Najati 대한수학회 2009 대한수학회보 Vol.46 No.3
In this paper we prove that every Jordan θ-derivation on a Lie triple system is a θ-derivation. Specially, we conclude that every Jordan derivation on a Lie triple system is a derivation. In this paper we prove that every Jordan θ-derivation on a Lie triple system is a θ-derivation. Specially, we conclude that every Jordan derivation on a Lie triple system is a derivation.
Hyers-Ulam-Rassias Stability of a Cubic Functional Equation
Abbas Najati 대한수학회 2007 대한수학회보 Vol.44 No.4
In this paper, we will nd out the general solution and in-vestigate the generalized HyersUlamRassias stability problem for thefollowing cubic functional equation3f(x + 3 y) + f(3x y) = 15 f(x + y) + 15 f(x y) + 80 f(y):The concept of Hyers-Ulam-Rassias stability originated from Th. M.Rassias’ stability theorem that appeared in his paper: On the stabilityof the linear mapping in Banach spaces, Proc. Amer. Math. Soc.72(1978), 297--300.