Theoretical investigation on the encapsulation of atomic hydrogen into heterofullerene nanocages

Masoud Bezi Javan,Masoud Darvish Ganji 한국물리학회 2013 Current Applied Physics Vol.13 No.7

We have investigated the structural and electronic configurations of the H@X-doped C60 fullerene (X = B,Si, P, O, S) as the novel materials for quantum bit (qubit) application by using density functional theory with the generalized-gradient approximation. Our results show that incorporated hydrogen atom exhibits significantly different interaction strengths and the calculated binding energies follow the hierarchy H@C59O < H@C59Si < H@C60 < H@C59B < H@C59S < H@C59P. In the considered complexes the binding energy is negative and the incorporated 1H atom resides at the center of heterofullerene nanocages. The obtained results also reveal that for the H@C59P complex the binding energy is four times higher than that of the traditional H@C60 fullerene, thus the H@C59P seems to be a promising material for the solid state quantum computers. Furthermore, the electronic and magnetic structures of the considered complexes at their ground state are discussed within the context.

Auto-combustion preparation and characterization of BaFe12O19 nanostructures by using maleic acid as fuel

Masoud Salavati-Niasari,Faezeh Soofivand,Masoud Salavati-Niasari,Samira Bagheri 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-

In this paper, barrium hexaferrite nanoparticles have been successfully synthesized via sol–gel auto combustion method based on the reaction between Ba(NO3)2 and Fe(NO3)3 in water, in present of maleic acid as capping agent and fuel. Also, various polymers used to obtaining pure phase barrium hexaferrite. The products were characterized by X-ray diffraction, scanning electron microscopy, X-ray energy dispersive spectroscopy analysis. To investigate the effects of amount of maleic acid and the kind of polymer on the morphology of products and finding optimal condition, several experiments were carried out. It was found that the phase and morphology of products could be influenced by these parameters. Vibrating sample magnetometer (VSM) was used to study the magnetism properties of BaFe12O19 samples.

Non stationary vibration and super harmonic resonances of nonlinear viscoelastic nano resonators

Mir Masoud Seyyed Fakhrabadi,Masoud Ajri,Abbas Rastgoo 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.70 No.5

This paper analyzes the non-stationary vibration and super-harmonic resonances in nonlinear dynamic motion of viscoelastic nano-resonators. For this purpose, a new coupled size-dependent model is developed for a plate-shape nano-resonator made of nonlinear viscoelastic material based on modified coupled stress theory. The virtual work induced by viscous forces obtained in the framework of the Leaderman integral for the size-independent and size-dependent stress tensors. With incorporating the size-dependent potential energy, kinetic energy, and an external excitation force work based on Hamilton’s principle, the viscous work equation is balanced. The resulting size-dependent viscoelastically coupled equations are solved using the expansion theory, Galerkin method and the fourth-order Runge–Kutta technique. The Hilbert–Huang transform is performed to examine the effects of the viscoelastic parameter and initial excitation values on the nanosystem free vibration. Furthermore, the secondary resonance due to the super-harmonic motions are examined in the form of frequency response, force response, Poincare map, phase portrait and fast Fourier transforms. The results show that the vibration of viscoelastic nanosystem is non-stationary at higher excitation values unlike the elastic ones. In addition, ignoring the small-size effects shifts the secondary resonance, significantly.

Resonant CLL Non-Inverting Buck-Boost Converter

Masoud Jabbari,Saead Sharifi,Ghazanfar Shahgholian 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.1

This paper presents a resonant non-inverting buck-boost converter in which all switches operate under ZCS conditions. In a symmetric configuration, a CLL resonant tank along with an inverter arm and a rectifying diode are employed. The diode is turned off at ZCS and hence the problem of its reverse recovery is obviated also. As a result switching losses and EMI are reduced and switching frequency can be increased. The converter can work at DCM and CCM depend on the switching frequency and the load-current. Experimental results from a 200W/200KHz laboratory prototype verify operation of the proposed converter and the presented theoretical analysis.

The Evolution of the E-Business Value Cycle Through Value Co-Creation during the COVID-19 Pandemic: An Empirical Study from Iran

Masoud TAHERINIA,Khaled NAWASER,Ali SHARIATNEJAD,Abdullah SAEDI,Mojtaba MOSHTAGHI 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.10

The present study aims to evolve the value cycle of e-business through value co-creation during the Coronavirus pandemic. The population of the study is experts consisting of university professors in the fields of marketing management, e-commerce, and managers of organizations and companies in Iran. Using the snowball sampling method, 50 of them were selected as the sample. This study employs the factor analysis method and structural equation modeling (SEM) approach for identification of the factors. The findings of this study reveal that 10 factors affect the evolution of the value chain into the value cycle, including customer relationship management, e-literacy, value co-creation, e-readiness, and integrated value creation, the logic of service dominance, shared value creation, virtual culture, e-trust, and network economics. Despite the difficulties that COVID-19 has created for businesses worldwide, the evolution of the e-business value cycle through value co-creation in the Coronavirus pandemic can be considered as a positive aspect of the pandemic. In fact, with more pandemics and more customers turning to e-businesses due to the co-creation of customer value, e-businesses can cover their weaknesses and improve their strengths by engaging customers and receiving their feedback, thus transforming their value chain into the value cycle.

Formal Instruction and the Acquisition of Linguistic Features

Masoud Rahimi Domakani 아시아영어교육학회 2008 The Journal of Asia TEFL Vol.5 No.2

A Damage Mitigation Measure for Steel Structures under Blast Loading

Masoud Mirtaheri,Ehsan Sharei,Anahita Norouzi 한국강구조학회 2011 International Journal of Steel Structures Vol.11 No.3

The number of explosive attacks on civilian buildings has recently increased and the pattern of damage inflicted on structures when an explosion takes place remains quite difficult to predict. This paper performs a 3-dimensional dynamic response and damage analysis on steel frame structure, subjected to blast loads created by explosive devices. In this study, advantages of using polymer cables as a means of damage mitigation are investigated. Results from this study shows that synthetic fiber ropes as bracing for steel structures reduce the horizontal displacements of structure caused by air blast pressure. The contribution of fiber ropes in structural stability is also presented.

An integrated approach for structural health monitoring using an in-house built fiber optic system and non-parametric data analysis

Masoud Malekzadeh,Necati Catbas,Mustafa Gul,권일범 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.14 No.5

Multivariate statistics based damage detection algorithms employed in conjunction with novel sensing technologies are attracting more attention for long term Structural Health Monitoring of civil infrastructure. In this study, two practical data driven methods are investigated utilizing strain data captured from a 4-span bridge model by Fiber Bragg Grating (FBG) sensors as part of a bridge health monitoring study. The most common and critical bridge damage scenarios were simulated on the representative bridge model equipped with FBG sensors. A high speed FBG interrogator system is developed by the authors to collect the strain responses under moving vehicle loads using FBG sensors. Two data driven methods, Moving Principal Component Analysis (MPCA) and Moving Cross Correlation Analysis (MCCA), are coded and implemented to handle and process the large amount of data. The efficiency of the SHM system with FBG sensors, MPCA and MCCA methods for detecting and localizing damage is explored with several experiments. Based on the findings presented in this paper, the MPCA and MCCA coupled with FBG sensors can be deemed to deliver promising results to detect both local and global damage implemented on the bridge structure.

Improving the behavior of buckling restrained braces through obtaining optimum steel core length

Masoud Mirtaheri,Saeed Sehat,Meissam Nazeryan 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.65 No.4

Concentric braced frames are commonly used in steel structures to withstand lateral forces. One of the drawbacks of these systems is the possibility that the braces are buckled under compressive loads, which leads to sudden reduction of the bearing capacity of the structure. To overcome this deficiency, the idea of the Buckling Restrained Brace (BRB) has been proposed in recent years. The length of a BRB steel core can have a significant effect on its overall behavior, since it directly influences the energy dissipation capability of the member. In this study, numerical methods have been utilized for investigation of the optimum length of BRB steel cores. For this purpose, BRBs with different lengths placed into several two-dimensional framing systems with various heights were considered. Then, the Response History Analysis (RHA) was performed, and finally, the optimum steel core length of BRBs and its effect on the responses of the overall system were investigated. The results show that the shortest length where failure does not occur is the best length that can be proposed as the optimum steel core length of BRBs. This length can be obtained through a formula which has been derived and verified in this study by both analytical and numerical methods.

Recent progress in microneme-based vaccines development against Toxoplasma gondii

Masoud Foroutan,Leila Zaki,Fatemeh Ghaffarifar 대한백신학회 2018 Clinical and Experimental Vaccine Research Vol.7 No.2

Toxoplasmosis is a cosmopolitan zoonotic disease, which infect several warm-blooded mammals. More than one-third of the human population are seropositive worldwide. Due to the high seroprevalence of Toxoplasma gondii infection worldwide, the resulting clinical, mental, and economical complications, as well as incapability of current drugs in the elimination of parasites within tissue cysts, the development of a vaccine against T. gondii would be critical. In the past decades, valuable advances have been achieved in order to identification of vaccine candidates against T. gondii infection. Microneme proteins (MICs) secreted by the micronemes play a critical role in the initial stages of host cell invasion by parasites. In this review, we have summarized the recent progress for MIC-based vaccines development, such as DNA vaccines, recombinant protein vaccines, vaccines based on live-attenuated vectors, and prime-boost strategy in different mouse models. In conclusion, the use of live-attenuated vectors as vehicles to deliver and express the target gene and prime-boost regimens showed excellent outcomes in the development of vaccines against toxoplasmosis, which need more attention in the future studies.