Baha A. Marouf, Thamir A. Al‐Khayat and Ali K. Mehdi
The radiological consequences on the population of a borax accidentin 1994 in the Tammuz 2 nuclear reactor have been postulated. Doseequivalents resulting from the atmospheric…
Abstract
The radiological consequences on the population of a borax accident in 1994 in the Tammuz 2 nuclear reactor have been postulated. Dose equivalents resulting from the atmospheric release of radionuclides during the accident have been estimated for distances ranging from the exclusion zone to 100km from the reactor. Gamma submersion, beta submersion doses from the plume, inhalation doses and surface exposure doses have been estimated for various exposure times. Dose equivalents estimated for the site boundary for an exposure time of 24 hours were 1.42 − 10mSv. Accordingly, it seemed that the consequences of the accident on the population living around Tuwaitha site could only take the form of stochastic radiation, such as the induction of cancers, and heredity.
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Kumari Amrita Tripathi and Saumya Singh
This paper aims to study the impediments and difficulties that prevent Indian women from becoming entrepreneurs.
Abstract
Purpose
This paper aims to study the impediments and difficulties that prevent Indian women from becoming entrepreneurs.
Design/methodology/approach
Data were obtained through a survey involving 15 experts. Based on the feedback provided by the experts, ten relevant barriers in the context of Indian micro small and medium enterprises (MSMEs) were chosen. A structured questionnaire was used to gather data. These ten barriers create obstruction for Indian women as entrepreneurs. These barriers were ranked, and causal relationships among them established using interpretive structural modeling and Matrice d’Impacts croises-multiplication appliqúean classment (cross-impact matrix multiplication applied to classification) (ISM–MICMAC) approach.
Findings
This study identifies, on the basis of extant literature and experts’ opinion, ten barriers to female entrepreneurship. These barriers were ranked, and causal relationships among them established using the ISM–MICMAC approach. On the basis of ranking, women can move forward in MSMEs after removing these obstacles and it will have good results.
Research limitations/implications
In this research, with literature reviews and experts opinion, ten barriers have been identified for women’s entrepreneurship and have been used to build the model.
Practical implications
To bring Indian women forward in the field of entrepreneurship, both the society and the government should work together, and efforts should be made to overcome the obstacles coming in the way of entrepreneurs.
Social implications
Female entrepreneurship in India faces many problems including negative attitude of authorities and society toward women. The society and authorities have no format or model for Indian women to move forward in the entrepreneurship sector.
Originality/value
This study seeks to identify, on the basis of a thorough review of literature and expert opinion, major barriers to female entrepreneurship in the context of Indian MSMEs.
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Manar Hamid Jasim, Ali Mohammad Ali Al-Araji, Bashar Dheyaa Hussein Al-Kasob and Mehdi Ranjbar
In the article, analytical model of first-order shear deformation (FSDT) beams made of jute–epoxy is presented to study the low-velocity impact response.
Abstract
Purpose
In the article, analytical model of first-order shear deformation (FSDT) beams made of jute–epoxy is presented to study the low-velocity impact response.
Design/methodology/approach
The nonlinear Hertz contact law is applied to identify the contact between projectile and beam. The energy method, Lagrange's equations and Ritz method are applied to derive the nonlinear governing equation of the beam and impactor-associated boundary condition. The motion equations are then solved simultaneously by the Runge–Kutta fourth-order method.
Findings
Also, a comparison is performed to validate the model predictions. The contact force and beam indentation histories of the jute–epoxy simply supported beam under spherical impactor with different radius and initial velocity are investigated in detail. It is found that in response to impactor radius increase, the utilization of the contact force law has resulted in a same increasing trend of peak contact force, impact duration and beam indentation, while in response to impactor initial velocity increase, the maximum contact force and beam indentation increase while impact time has vice versa trend.
Originality/value
This paper fulfills an identified need to study how jute–epoxy beam behavior with simply supported boundary conditions under low-velocity impact can be enabled.
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Aurang Zaib, Rizwan Ul Haq, Ali J. Chamkha and Mohammad Mehdi Rashidi
The purpose of this paper is to present an inclusive study of the mixed convective flow involving micropolar fluid holding kerosene/water-based TiO2 nanoparticle towards a…
Abstract
Purpose
The purpose of this paper is to present an inclusive study of the mixed convective flow involving micropolar fluid holding kerosene/water-based TiO2 nanoparticle towards a vertical Riga surface with partial slip. The outcomes are confined for opposing and assisting flows.
Design/methodology/approach
Similarity equations are acquired and then worked out numerically by the Keller box technique.
Findings
Impacts of significant parameters on microrotation velocity, temperature distribution, velocity profile together with the Nusselt number and the skin friction are argued with the help of graphs. Two solutions are achieved in opposing flow, while the solution is unique in assisting flow. It is also monitored that the separation of boundary layer delays because of micropolar parameter and accelerates because of volume fraction.
Originality/value
The authors trust that all these results are new and significant for researchers.
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Ali Mostafaeipour, Sajjad Sadeghi, Mehdi Jahangiri, Omid Nematollahi and Ali Rezaeian Sabbagh
Wind as a major source of renewable energy has received tremendous attentions due to its unique features to reduce carbon emission and also to keep the environment safe…
Abstract
Purpose
Wind as a major source of renewable energy has received tremendous attentions due to its unique features to reduce carbon emission and also to keep the environment safe. Nevertheless, to use wind energy properly, the environmental circumstances and geographical location related to wind intensity should be considered as a priority. Different factors may affect the selection of a suitable location for developments of wind power plants; thus, these factors should be considered concurrently to identify the optimum location of wind plants.
Design/methodology/approach
In this study, first, basic data envelopment analysis (DEA) was used, then dual DEA was used and, finally, Anderson Petersen (AP) model of dual DEA was selected to prioritize cities or decision-making units (DMUs). Numerical Taxonomy (NT) method was also used to assess the validity of AP dual model in DEA. The prescribed approach was applied for five cities in East Azerbaijan province of Iran.
Findings
The results indicate that wind power as a renewable energy can be harnessed in few cities, and the ranking by DEA illustrated that the city of Tabriz is the first priority.
Practical implications
Low environmental degradation effects in comparison to other methods and the ability to utilization at a widespread level include the benefits of using wind energy in the generation of electricity. In this regard, the study of relevant potentials and finding suitable locations for the deployment of wind energy utilization equipment are essential. Using DEA method helps us to choose optimal locations according to different criteria.
Social implications
Wind energy is justifiable in reducing social costs in comparison with fossil fuel plants, which includes negative effects, and its electricity can be used as a sustainable energy in the country's economic, social and cultural development.
Originality/value
For identifying the most proper location for development of wind power plants in Iran, DEA is applied for the first time to prioritize the suitable locations for installations of wind turbines among five different cities in the East Azerbaijan region. A number of crucial factors including land price, distance to power, rate of natural hazards, wind speed and topography are considered for location optimization of wind turbines for the first time. Also, to validate the results of DEA method, NT method is used to assess the validity of AP dual model in DEA.
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Mehdi Dadkhah, Mehran Masdari, Mohammad Ali Vaziri and Mojtaba Tahani
In this paper, experimental and numerical results of a lambda wing have been compared. The purpose of this paper is to study the behaviour of lambda wings using a CFD tool and to…
Abstract
Purpose
In this paper, experimental and numerical results of a lambda wing have been compared. The purpose of this paper is to study the behaviour of lambda wings using a CFD tool and to consider different numerical models to obtain the most accurate results. As far as the consideration of numerical methods is concerned, the main focus is on the evaluation of computational methods for an accurate prediction of contingent leading edge vortices’ path and the flow separation occurring because of the burst of these vortices on the wing.
Design/methodology/approach
Experimental tests are performed in a closed-circuit wind tunnel at the Reynolds number of 6 × 105 and angles of attack (AOA) ranging from 0 to 10 degrees. Investigated turbulence models in this study are Reynolds Averaged Navior–Stokes (RANS) models in a steady state. To compare the accuracy of the turbulence models with respect to experimental results, sensitivity study of these models has been plotted in bar charts.
Findings
The results illustrate that the leading edge vortex on this lambda wing is unstable and disappears soon. The effect of this disappearance is obvious by an increase in local drag coefficient in the junction of inner and outer wings. Streamlines on the upper surface of the wing show that at AOA higher than 8 degrees, the absence of an intense leading edge vortex leads to a local flow separation on the outer wing and a reverse in the flow.
Research limitations/implications
Results obtained from the behaviour study of transition (TSS) turbulence model are more compatible with experimental findings. This model predicts the drag coefficient of the wing with the highest accuracy. Of all considered turbulence models, the Spalart model was not able to accurately predict the non-linearity of drag and pitching moment coefficients. Except for the TSS turbulence model, all other models are unable to predict the aerodynamic coefficients corresponding to AOA higher than 10 degrees.
Practical implications
The presented results in this paper include lift, drag and pitching moment coefficients in various AOA and also the distribution of aerodynamic coefficients along the span.
Originality/value
The presented results include lift, drag and pitching moment coefficients in various AOA and also aerodynamic coefficients distribution along the span.
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Mahyar Ashouri, Mohammad Mehdi Zarei and Ali Moosavi
The purpose of this paper is to investigate the effects of geometrical parameters, eccentricity and perforated fins on natural convection heat transfer in a finned horizontal…
Abstract
Purpose
The purpose of this paper is to investigate the effects of geometrical parameters, eccentricity and perforated fins on natural convection heat transfer in a finned horizontal annulus using three-dimensional lattice Boltzmann flux solver.
Design/methodology/approach
Three-dimensional lattice Boltzmann flux solver is used in the present study for simulating conjugate heat transfer within an annulus. D3Q15 and D3Q7 models are used to solve the fluid flow and temperature field, respectively. The finite volume method is used to discretize mass, momentum and energy equations. The Chapman–Enskog expansion analysis is used to establish the connection between the lattice Boltzmann equation local solution and macroscopic fluxes. To improve the accuracy of the lattice Boltzmann method for curved boundaries, lattice Boltzmann equation local solution at each cell interface is considered to be independent of each other.
Findings
It is found that the maximum heat transfer rate occurs at low fin spacing especially by increasing the fin height and decreasing the internal-cylindrical distance. The effect of inner cylinder eccentricity is not much considerable (up to 5.2% enhancement) while the impact of fin eccentricity is more remarkable. Negative fin eccentricity further enhances the heat transfer rate compared to a positive fin eccentricity and the maximum heat transfer enhancement of 91.7% is obtained. The influence of using perforated fins is more considerable at low fin spacing although some heat transfer enhancements are observed at higher fin spacing.
Originality/value
The originality of this paper is to study three-dimensional natural convection in a finned-horizontal annulus using three-dimensional lattice Boltzmann flux solver, as well as to apply symmetry and periodic boundary conditions and to analyze the effect of eccentric annular fins (for the first time for air) and perforated annular fins (for the first time so far) on the heat transfer rate.
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Marjan Goodarzi, Saeed Javid, Ali Sajadifar, Mehdi Nojoomizadeh, Seyed Hossein Motaharipour, Quang-Vu Bach and Arash Karimipour
With respect to two new subjects, i.e. nanofluids and microchannels, in heat transfer systems and modern techniques used for building them, this paper aims to study on effect of…
Abstract
Purpose
With respect to two new subjects, i.e. nanofluids and microchannels, in heat transfer systems and modern techniques used for building them, this paper aims to study on effect of using aluminum oxide nanoparticles in non-Newtonian fluid of aqueous solution of carboxy-methyl cellulose in microtube and through application of different slip coefficients to achieve various qualities on surface of microtube.
Design/methodology/approach
Simultaneously, the effect of presence of nanoparticles and phenomenon of slip and temperature jump has been explored in non-Newtonian nanofluid in this essay. The assumption of homogeneity of nanofluid and fixed temperature of wall in microtube has been used in modeling processes.
Findings
The results have been presented as diagrams of velocity, temperature and Nusselt Number and the investigations have indicated that addition of nanoparticles to the base fluid and increase in microtube slip coefficient might improve rate of heat transfer in microtube.
Originality/value
The flow of non-Newtonian nanofluid of aqueous solution of carboxy methyl cellulose-aluminum oxide has been determined in a microtube for the first time.
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Ali Sadik Gafer Qanber, Raed Salman Saeed Alhusseini, Bashar Dheyaa Hussein Al-Kasob, Manar Hamid Jasim and Mehdi Ranjbar
The main objective of this article is to develop a theoretical formulation for predicting the response of CNTs reinforced beam under multiple impactors with general boundary…
Abstract
Purpose
The main objective of this article is to develop a theoretical formulation for predicting the response of CNTs reinforced beam under multiple impactors with general boundary conditions, using first-order shear deformation beam theory.
Design/methodology/approach
The rule of mixtures is implemented to derive the material properties of the beam. The nonlinear Hertz contact law is applied for simulation between impactors and the surface of the beam. A combination of approaches includes energy method, Ritz method and generalized Lagrange equations are used to extract the matrix form of equations of motion. The time-domain solution is obtained using implementing the well-known Runge Kutta 4th order method.
Findings
After examining the accuracy of the present method, the effects of the number of impactors include one impactor, and three impactors in various CNTs volume fraction are studied for CNTs reinforced beam with clamped-clamped, clamped-free and simply supported boundary conditions under the low-velocity impact. The most important finding of this article is that contact force and beam indentation at the middle of the beam in the case of one impactor are greater than those reported in the case of three impactors.
Originality/value
This article fulfills an identified need to study how CNTs reinforced beam behaviour with general boundary conditions under multiple low-velocity impacts can be enabled.
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Ali Mazaherinezhad, Aram Mahmood Ahmed, Marwan Yassin Ghafour, Omed Hassan Ahmed, Saqib Ali and Mehdi Hosseinzadeh
Knowledge management (KM) implementation is the ideal solution for enhancing employee’s abilities like mental health and performance. This study aims at testing the impact of KM…
Abstract
Purpose
Knowledge management (KM) implementation is the ideal solution for enhancing employee’s abilities like mental health and performance. This study aims at testing the impact of KM mechanism on personnel’s mental health at the Iran University of Medical Sciences.
Design/methodology/approach
The study is a descriptive, correlational and applied one. The library and field studies have been used to collect data through the questionnaire. The proposed model and the data have been analyzed using Smart PLS software. A questionnaire has been conducted by an arbitrary sampling method.
Findings
The results have shown that the main factors of KM have a direct, meaningful positive impact on innovation. Besides, the critical parameters of KM success, strategy and process have a significant and direct positive effect on the tendency for knowledge-sharing behavior. Further, the direct relationship of the trend for knowledge-sharing behavior with the mental health of employees has positively been confirmed. The results have also indicated that psychological empowerment has a positive and significant effect on the mental health of employees.
Research limitations/implications
This study has investigated the four parameters (i.e. key factors for KM success, KM strategy, KM processes and psychological empowerment) impacting the knowledge-sharing intention, conduct of the people and the mental health of the employees. Scholars can investigate other personal and organizational parameters such as probable backgrounds of the knowledge-sharing intention, conduct and the mental health of the employees.
Practical implications
These findings will be essential in the understanding of the interplay among various signals in theory and the understanding of patients’ choices in the electronic health (e-health) community in practice. The results have implications for existing health management and e-health literature. The present paper will help policymakers, healthcare executives and project managers to effectively set their operations and make them maintainable, prevent unpredicted obstacles and better allocate their resources. Overall, the result of this paper will guide researchers who are working in the field of e-health.
Originality/value
The findings can develop robust knowledge-sharing platforms and offer insightful suggestions for management practitioners in emerging markets.