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Introduction to a Framework for Assessing Tourism Potential
Hoda Karimipour,Yadollah Karimipour,Zeinab Yegane Kia 한국문화관광학회 2010 문화관광연구 Vol.12 No.2
As site selection is one of the most important stages in tourism development planning, this study provides the prospect of improved information for achieving this aim, observing the sustainable development regulations. In fact, the main aim of this research is to introduce a framework for assessing the tourism potential of the regions and, ultimately, selection of sites for establishing tourist complexes. This site selection process has been designed in two stages and uses micro and macro scales. In the first stage of the process, which includes site selection at the macro scale level, a number of criteria have been proposed, by which the selection of one city from among several cities would be possible for tourism investment. These criteria have been introduced using AHP (Analytic Hierarchy Process) method. In the second stage of site selection, which entails the selection of location at the micro scale level, the introduced criteria help the users in selection of the best location for establishing tourist complexes on a smaller scale, across a city.
Masoud Karimipour,Sara Mashhoun,Mohsen Mollaei,Mehdi Molaei,Nima Taghavinia 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.4
TiO2 nanotubes were synthesized using a modified autoclave-free thermal method from as-prepared initial powders. The size of initial powders (IP) was found to be critical in determining the morphology and crystal structure of the final product. Oleylamine (OA) was used as the polymer agent in the preparation of initial powders with different mol ratios of OA/Ti: 1, 5, and 10. X-ray diffraction analysis depicted that the increase of mole ratio up to 10 resulted in smaller nanoparticles with the sizes of about 8 nm. It was also deliberated that low temperature thermally treated IP showed the characteristic diffraction pattern of titanate phase of nanotubes. Scanning electron microscope images showed nanorods, short nanotubes, and single-phase long and uniform nanofibers produced from initial powders. SEM cross-section of the anode cell of TiO2 nanofibers demonstrated the presence of uniformly closed net long fibers in the cell. Open circuit voltage measurements of the nanofiber cell demonstrated a several hundreds of seconds in the electron transport decay, which was significantly higher than that of the nanoparticles. IMPS/IMVS measurements of the nanofibers and nanotube solar cells showed electron transport enhancement and long life time compared to their nanoparticle counterparts.
Red Florescent Ag2S-CdS Hybrid Nanoparticles Prepared by a One Pot and Rapid Microwave Method
Masoud Karimipour,Mehdi Molaei 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.2
In this work, Ag2S-CdS hybrid composite with novel luminescenceproperty was synthesized using a one pot and rapid microwave method. Structural analysis by means of XRD and TEM obtained the formationof the composite. Optical spectroscopy by means of UV-Vis andPhotoluminescence measurements revealed that the functionalcomposite has an intensive red light emission at 657 nm with a largestocks shift of about 150 nm. The quantum efficiency of the preparedhybrid material in red region is 10% which is comparable with theefficiency of pure CdS (11%) with green emission.
Two rectangular elements based on analytical functions
Rezaiee-Pajand, Mohammad,Karimipour, Arash Techno-Press 2020 Advances in computational design Vol.5 No.2
To achieve appropriate stresses, two new rectangular elements are presented in this study. For reaching this aim, a complementary energy functional is used within an element for the analysis of plane problems. In this energy form, the Airy stress function will be used as a functional variable. Besides, some basic analytical solutions are found for the stress functions. These trial functions are matched with each element number of degrees of freedom, which leads to a number of equations with the anonymous constants. Subsequently, according to the principle of minimum complementary energy, the unknown constants can be expressed in terms of displacements. This system can be rewritten in terms of the nodal displacement. In this way, two new hybrid-rectangular triangular elements are formulated, which have 16 and 40 degrees of freedom. To validate the outcomes, extensive numerical studies are performed. All findings clearly demonstrate accuracies of structural displacements, as well as, stresses.
Easy function for solving linear elasticity problems
Mohammad Rezaiee-Pajand,Arash Karimipour 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.81 No.3
It is well known that after finding the displacement in the structural mechanics, strain and stress can be obtained in the straight-forward process. The main purpose of this paper is to unify the displacement functions for solving the solid body. By performing mathematical operations, three sets of these key relationships are found in this paper. All of them are written in the Cartesian Coordinates and in terms of a simple function. Both analytical and numerical approaches are utilized to validate the correctness of the presented formulations. Since all required conditions for the bodies with self-equilibrated loadings are satisfied accurately, the authors’ relations can solve these kinds of problems. This fact is studied in-depth by solving some numerical examples. It is found that a very simple function can be used for each formulation instead of ten different and complex displacement potentials defined by previous studies.
M. Molaei,H. Hasheminejad,M. Karimipour 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.1
In this work, photoluminescence (PL) properties of CdTe and CdTe@CdS core-shellquantum dots (QDs) were investigated. CdTe and CdTe@CdS QDs were synthesizedusing a microwave activated method. CdS shell grown using a microwave activatedmethod which was based on the heat sensitivity of Na2S2O3. X-ray diffraction (XRD)analysis demonstrated cubic crystalline structure for both of the synthesized QDs, butfor CdTe@CdS QDs, XRD diffraction peaks shifted to the longer angle. Sizes of CdTeand CdTe@CdS QDs were obtained as about 2.5 and 3.5 nm from transmission electronmicroscopy (TEM) images. UV-Vis and PL spectra showed that in this method both ofthe absorption and emission of CdTe QDs shifted from near blue to near red. By thegrowth of CdS shell around CdTe QDs, a red shift was observed in absorption and PLspectra. PL QY was obtained as about 23% and 38% for CdTe and CdTe@CdS core-shellQDs, respectively. Increase in the thickness of the CdS shell was possible only by the increase in the microwave irradiation timein the CdS shell growth step. Growth of the CdS shell around CdTe core, resulted in the red shift in band edge and PL spectra tothe longer wavelengths.
A mathematical model for smart functionally graded beam integrated with shape memory alloy actuators
H. Sepiani,F. Ebrahimi,H. Karimipour 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.12
This paper presents a theoretical study of the thermally driven behavior of a shape memory alloy (SMA)/FGM actuator under arbitrary loading and boundary conditions by developing an integrated mathematical model. The model studied is established on the geometric parameters of the three-dimensional laminated composite box beam as an actuator that consists of a functionally graded core integrated with SMA actuator layers with a uniform rectangular cross section. The constitutive equation and linear phase transformation kinetics relations of SMA layers based on Tanaka and Nagaki model are coupled with the governing equation of the actuator to predict the stress history and to model the thermo-mechanical behavior of the smart shape memory alloy/FGM beam. Based on the classical laminated beam theory, the explicit solution to the structural response of the structure, including axial and lateral deflections of the structure, is investigated. As an example, a cantilever box beam subjected to a transverse concentrated load is solved numerically. It is found that the changes in the actuator's responses during the phase transformation due to the strain recovery are significant.
A simple one Step Thermochemical Approach for Synthesis of ZnS:Mn Nanocrystals (NCs)
Molaei, Mehdi,Lotfiani, Ahmad,Karimimaskon, Fatemeh,Karimipour, Masoud,Khanzadeh, Mohammd The Institute of Electronics and Information Engin 2014 Journal of semiconductor technology and science Vol.14 No.1
In this work we have synthesized ZnS:Mn nanocrystals (NCs) using a simple one step thermochemical method. $Zn(NO_3)_2$ and $Na_2S_2O_3$ were used as the precursors and $Mn(NO_3)_2$ was the source of impurity. Thioglycolic acid (TGA) was used as the capping agent and the catalyst of the reaction. The structure and optical property of the NCs were characterized by means of X- ray diffraction (XRD), HRTEM, UV-visible optical spectroscopy and photoluminescence (PL). X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses demonstrated cubic phase ZnS:Mn NCs with an average size around 3 nm. Synthesized NCs exhibited band gap of about 4 eV. Photoluminescence spectra showed a yellow-orange emission with a peak located at 585 nm, demonstrating the Mn incorporation inside the ZnS particles.