Cornelia Revnic - Academia.edu (original) (raw)

Papers by Cornelia Revnic

Studia Universitatis Babeş-Bolyai, Dec 1, 2022

A free convection problem for bidisperse porous media is considered. The numerical solutions are ... more A free convection problem for bidisperse porous media is considered. The numerical solutions are obtained using an algorithm based on an nonuniform grid. Results for some values of the governing parameters when Rayleigh number is equal to 10 4 are provided.

Meccanica, 2009

Laminar two-dimensional stagnation flow of a viscous and electrically conducting fluid obliquely ... more Laminar two-dimensional stagnation flow of a viscous and electrically conducting fluid obliquely impinging on a flat plate in the presence of a uniform applied magnetic field is formulated as a similarity solution of the Navier-Stokes equations. The relative importance of this flow is measured by the dimensionless strain rate and magnetohydrodynamic parameters γ and M. The viscous problem is reduced to a coupled pair of ordinary differential equations governed by γ and M. It is found that the parameter M causes a shift in the position of the point of zero skin friction along the wall.

The Navier-Stokes and energy equations for the steady laminar incompressible flow past a row of c... more The Navier-Stokes and energy equations for the steady laminar incompressible flow past a row of circular cylinders at constant temperature are solved numerically. Prime attention was focused on how heat transfer characteristics are affected by variation of Reynolds number. The study was limited to Reynolds number ranging from 1 to 100 and the Prandtl number has been fixed to a

The Open Transport Phenomena Journal, 2009

Steady natural convection flow in an inclined square cavity filled with a porous medium has been ... more Steady natural convection flow in an inclined square cavity filled with a porous medium has been investigated. It is assumed that the cavity is heated on one wall and cooled from an adjacent wall, while the other two walls are adiabatic. The governing dimensionless partial differential equations have been solved numerically for the stream function, isotherms, and the local and average Nusselt numbers using a central finite-difference method and Richardson extrapolation. Effects of the various parameters on the flow and heat transfer characteristics have been investigated, namely: Rayleigh numbers 10, 100, and 1000, and the inclined angle of the cavity from 0 o to 315 0 . Special attention is given to the understanding of the effects of the inclination on the heat transfer rates on the heated and cooled walls as well as the flow configurations. It is found that the streamlines, isotherms and the average Nusselt numbers are affected significantly by the inclination of the cavity and the Rayleigh number. Results could be obtained for angles of inclination for Rayleigh numbers up to 100 but for a Rayleigh number of 1000 solutions could not be obtained for all angles of inclination.

IFMBE Proceedings, 2009

This paper presents a numerical study of a diffusive free convection in a rectangular cavity fill... more This paper presents a numerical study of a diffusive free convection in a rectangular cavity filled with a porous medium. It is assumed that the left vertical wall is subject to a mixed boundary condition (Robin) and the right vertical wall is kept at a constant concentration, while the horizontal walls are adiabatic. The governing mass conservation, Darcy law and

Methodologies, Tools and New Developments for E-Learning, 2012

2010 Fourth International Conference on Digital Society, 2010

This paper presents a Java framework for analyzing, processing and understanding wound images, to... more This paper presents a Java framework for analyzing, processing and understanding wound images, to be used in teaching, learning and research activities. We intend to promote e-learning technologies in medical, pharmaceutical and health care domains. Using Java and XML technologies, we build models for various categories of wounds, due to various etiologies. Based on color and texture analysis, we identify the main barriers to wound healing, such as tissue nonviable, infection, inflammation, moisture imbalance, or edge non-advancing. This framework provides the infrastructure for preparing e-learning scenarios based on practice and real world experiences. We make experiments for wound healing simulation using various treatments and compare the results with experimental observations. Our experiments are supported by XML based databases containing knowledge extracted from previous wound healing experiences and from medical experts' knowledge. Also, we rely on new paradigms of the Artificial Intelligence for creating e-learning scenarios to be used in a context of active learning, for wound image understanding. To implement the e-learning tools, we use Java technologies for dynamic processes and XML technologies for dynamic content. Our approach to e-learning is so called blended learning, which combines traditional face-to-face and Web-based on-line learning, with focus on principles of active learning.

2010 Fourth UKSim European Symposium on Computer Modeling and Simulation, 2010

This paper presents a Java framework for analyzing, processing and understanding wound images, to... more This paper presents a Java framework for analyzing, processing and understanding wound images, to be used in teaching, learning and research activities. We intend to promote e-learning technologies in medical, pharmaceutical and health care domains. Using Java and XML technologies, we build models for various categories of wounds, due to various etiologies. Based on color and texture analysis, we identify the main barriers to wound healing, such as tissue non-viable, infection, inflammation, moisture imbalance, or edge non-advancing. This framework provides the infrastructure for preparing e-learning scenarios based on practice and real world experiences. We make experiments for wound healing simulation using various treatments and compare the results with experimental observations. Our experiments are supported by XML based databases containing knowledge extracted from previous wound healing experiences and from medical experts' knowledge. Also, we rely on new paradigms of the Artificial Intelligence for creating e-learning scenarios to be used in a context of active learning, for wound image understanding. To implement the e-learning tools, we use Java technologies for dynamic processes and XML technologies for dynamic content. Our approach to e-learning is so called blended learning, which combines traditional face-to-face and Web-based on-line learning, with focus on principles of active learning.

2009 IEEE/ACS International Conference on Computer Systems and Applications, 2009

This paper presents a Java framework for analyzing, processing and understanding wound images, to... more This paper presents a Java framework for analyzing, processing and understanding wound images, to be used in teaching, learning and research activities. We intend to promote e-learning technologies in medical, pharmaceutical and health care domains. Using Java and XML technologies, we build models for various categories of wounds, due to various etiologies. Based on color and texture analysis, we identify

International Journal of Thermal Sciences, 2012

ABSTRACT The steady mixed convection flow near an axisymmetric stagnation point on a stretching o... more ABSTRACT The steady mixed convection flow near an axisymmetric stagnation point on a stretching or shrinking vertical cylinder is considered. The equations for the fluid flow and temperature fields reduce to similarity form that involves a Reynolds number R, a mixed convection parameter λ, a parameter γ representing the motion of the cylinder and the Prandtl number σ. Numerical solutions of the similarity equations are obtained for representative values of these parameters, which show the existence of critical values λc = λc (R,γ,σ) with the existence of dual solutions in the opposing (λ < 0) case. The variation of the skin friction coefficient f″(1) and heat flux θ′(1) with λ and R when σ = 1.0 are shown graphically. Also variations of λc with R, and γ are determined again in the case when σ = 1.0. It is found that in the aiding flow (λ > 0) case solutions are possible for all λ and the asymptotic solution in the limit λ → ∞ is obtained. The nature of the solution in the asymptotic limit of large values of R is also treated in the cases when λ is of O (1) and when λ is of O (R).

International Journal of Heat and Mass Transfer, 2009

A numerical investigation of the steady magnetohydrodynamics free convection in a rectangular cav... more A numerical investigation of the steady magnetohydrodynamics free convection in a rectangular cavity filled with a fluid-saturated porous medium and with internal heat generation has been performed. A uniform magnetic field, inclined at an angle c with respect to the horizontal plane, is externally imposed. The values of the governing parameters are the inclined angle c = 0, p/6, p/4 and p/2, Hartmann number Ha = 0, 1, 5, 10 and 50, Rayleigh number Ra = 10, 100, 10 3 and 10 5 , and the aspect ratio a = 0.01, 0.2, 0.5 and 1 (square cavity). It is shown that the intensity of the core convection is considerably affected by the considered parameters. It is also found that the local Nusselt number Nu Y decreases on the bottom wall as c increases (magnetic field changes its direction from the horizontal to the vertical direction) and vice versa for the top wall of the cavity. The reported results are in good agreement with the available published work in the literature.

International Journal of Heat and Mass Transfer, 2011

... al. [21], Alchaar et al. [22], Chamkha and Al-Naser [23], Mahmud et al. [24], Hossain et al. ... more ... al. [21], Alchaar et al. [22], Chamkha and Al-Naser [23], Mahmud et al. [24], Hossain et al. [25] and Ece and Büyük [26], Zeng et al. [27], Mahdy et al. [28], Ramambason and Vasseur [29], Postelnicu [30], Nield [31], etc. However ...

International Journal of Heat and Mass Transfer, 2009

In this paper we investigate theoretically the unsteady boundary layer flow and heat transfer ove... more In this paper we investigate theoretically the unsteady boundary layer flow and heat transfer over a permeable shrinking sheet with non-uniform heat source. The nondimensional governing equations have been solved numerically using the bvp4c function from Matlab for different values of the pertinent parameters;

Pharmacology & Pharmacy, 2014

The reimbursement model for pharmaceutical care remains a barrier to successful widespread implem... more The reimbursement model for pharmaceutical care remains a barrier to successful widespread implementation of pharmacist-provided services. In some instances, community pharmacists have been successful in obtaining direct compensation for services from patients; however, evidence suggests that lack of patient demand for pharmacist-services may ultimately undermine the campaign for widespread third-party payment. The purpose of this study is to conduct a secondary analysis of data indicating consumer/patients' rationale for not purchasing pharmacist-provided disease management services when offered the opportunity to do so in community pharmacies. Our review of the data indicates that while financial concerns are clearly important in consumer demand for pharmacist-provided services, other considerations exist. The consumer/patient belief that pharmacist-provided services are duplicative or that these services are not needed are significant barriers to overcome. Intensive education and marketing campaigns are needed to sway consumer opinion on the value of pharmacist-provided services.

Studia Universitatis Babeş-Bolyai, Dec 1, 2022

A free convection problem for bidisperse porous media is considered. The numerical solutions are ... more A free convection problem for bidisperse porous media is considered. The numerical solutions are obtained using an algorithm based on an nonuniform grid. Results for some values of the governing parameters when Rayleigh number is equal to 10 4 are provided.

Meccanica, 2009

Laminar two-dimensional stagnation flow of a viscous and electrically conducting fluid obliquely ... more Laminar two-dimensional stagnation flow of a viscous and electrically conducting fluid obliquely impinging on a flat plate in the presence of a uniform applied magnetic field is formulated as a similarity solution of the Navier-Stokes equations. The relative importance of this flow is measured by the dimensionless strain rate and magnetohydrodynamic parameters γ and M. The viscous problem is reduced to a coupled pair of ordinary differential equations governed by γ and M. It is found that the parameter M causes a shift in the position of the point of zero skin friction along the wall.

The Navier-Stokes and energy equations for the steady laminar incompressible flow past a row of c... more The Navier-Stokes and energy equations for the steady laminar incompressible flow past a row of circular cylinders at constant temperature are solved numerically. Prime attention was focused on how heat transfer characteristics are affected by variation of Reynolds number. The study was limited to Reynolds number ranging from 1 to 100 and the Prandtl number has been fixed to a

The Open Transport Phenomena Journal, 2009

Steady natural convection flow in an inclined square cavity filled with a porous medium has been ... more Steady natural convection flow in an inclined square cavity filled with a porous medium has been investigated. It is assumed that the cavity is heated on one wall and cooled from an adjacent wall, while the other two walls are adiabatic. The governing dimensionless partial differential equations have been solved numerically for the stream function, isotherms, and the local and average Nusselt numbers using a central finite-difference method and Richardson extrapolation. Effects of the various parameters on the flow and heat transfer characteristics have been investigated, namely: Rayleigh numbers 10, 100, and 1000, and the inclined angle of the cavity from 0 o to 315 0 . Special attention is given to the understanding of the effects of the inclination on the heat transfer rates on the heated and cooled walls as well as the flow configurations. It is found that the streamlines, isotherms and the average Nusselt numbers are affected significantly by the inclination of the cavity and the Rayleigh number. Results could be obtained for angles of inclination for Rayleigh numbers up to 100 but for a Rayleigh number of 1000 solutions could not be obtained for all angles of inclination.

IFMBE Proceedings, 2009

This paper presents a numerical study of a diffusive free convection in a rectangular cavity fill... more This paper presents a numerical study of a diffusive free convection in a rectangular cavity filled with a porous medium. It is assumed that the left vertical wall is subject to a mixed boundary condition (Robin) and the right vertical wall is kept at a constant concentration, while the horizontal walls are adiabatic. The governing mass conservation, Darcy law and

Methodologies, Tools and New Developments for E-Learning, 2012

2010 Fourth International Conference on Digital Society, 2010

This paper presents a Java framework for analyzing, processing and understanding wound images, to... more This paper presents a Java framework for analyzing, processing and understanding wound images, to be used in teaching, learning and research activities. We intend to promote e-learning technologies in medical, pharmaceutical and health care domains. Using Java and XML technologies, we build models for various categories of wounds, due to various etiologies. Based on color and texture analysis, we identify the main barriers to wound healing, such as tissue nonviable, infection, inflammation, moisture imbalance, or edge non-advancing. This framework provides the infrastructure for preparing e-learning scenarios based on practice and real world experiences. We make experiments for wound healing simulation using various treatments and compare the results with experimental observations. Our experiments are supported by XML based databases containing knowledge extracted from previous wound healing experiences and from medical experts' knowledge. Also, we rely on new paradigms of the Artificial Intelligence for creating e-learning scenarios to be used in a context of active learning, for wound image understanding. To implement the e-learning tools, we use Java technologies for dynamic processes and XML technologies for dynamic content. Our approach to e-learning is so called blended learning, which combines traditional face-to-face and Web-based on-line learning, with focus on principles of active learning.

2010 Fourth UKSim European Symposium on Computer Modeling and Simulation, 2010

This paper presents a Java framework for analyzing, processing and understanding wound images, to... more This paper presents a Java framework for analyzing, processing and understanding wound images, to be used in teaching, learning and research activities. We intend to promote e-learning technologies in medical, pharmaceutical and health care domains. Using Java and XML technologies, we build models for various categories of wounds, due to various etiologies. Based on color and texture analysis, we identify the main barriers to wound healing, such as tissue non-viable, infection, inflammation, moisture imbalance, or edge non-advancing. This framework provides the infrastructure for preparing e-learning scenarios based on practice and real world experiences. We make experiments for wound healing simulation using various treatments and compare the results with experimental observations. Our experiments are supported by XML based databases containing knowledge extracted from previous wound healing experiences and from medical experts' knowledge. Also, we rely on new paradigms of the Artificial Intelligence for creating e-learning scenarios to be used in a context of active learning, for wound image understanding. To implement the e-learning tools, we use Java technologies for dynamic processes and XML technologies for dynamic content. Our approach to e-learning is so called blended learning, which combines traditional face-to-face and Web-based on-line learning, with focus on principles of active learning.

2009 IEEE/ACS International Conference on Computer Systems and Applications, 2009

This paper presents a Java framework for analyzing, processing and understanding wound images, to... more This paper presents a Java framework for analyzing, processing and understanding wound images, to be used in teaching, learning and research activities. We intend to promote e-learning technologies in medical, pharmaceutical and health care domains. Using Java and XML technologies, we build models for various categories of wounds, due to various etiologies. Based on color and texture analysis, we identify

International Journal of Thermal Sciences, 2012

ABSTRACT The steady mixed convection flow near an axisymmetric stagnation point on a stretching o... more ABSTRACT The steady mixed convection flow near an axisymmetric stagnation point on a stretching or shrinking vertical cylinder is considered. The equations for the fluid flow and temperature fields reduce to similarity form that involves a Reynolds number R, a mixed convection parameter λ, a parameter γ representing the motion of the cylinder and the Prandtl number σ. Numerical solutions of the similarity equations are obtained for representative values of these parameters, which show the existence of critical values λc = λc (R,γ,σ) with the existence of dual solutions in the opposing (λ < 0) case. The variation of the skin friction coefficient f″(1) and heat flux θ′(1) with λ and R when σ = 1.0 are shown graphically. Also variations of λc with R, and γ are determined again in the case when σ = 1.0. It is found that in the aiding flow (λ > 0) case solutions are possible for all λ and the asymptotic solution in the limit λ → ∞ is obtained. The nature of the solution in the asymptotic limit of large values of R is also treated in the cases when λ is of O (1) and when λ is of O (R).

International Journal of Heat and Mass Transfer, 2009

A numerical investigation of the steady magnetohydrodynamics free convection in a rectangular cav... more A numerical investigation of the steady magnetohydrodynamics free convection in a rectangular cavity filled with a fluid-saturated porous medium and with internal heat generation has been performed. A uniform magnetic field, inclined at an angle c with respect to the horizontal plane, is externally imposed. The values of the governing parameters are the inclined angle c = 0, p/6, p/4 and p/2, Hartmann number Ha = 0, 1, 5, 10 and 50, Rayleigh number Ra = 10, 100, 10 3 and 10 5 , and the aspect ratio a = 0.01, 0.2, 0.5 and 1 (square cavity). It is shown that the intensity of the core convection is considerably affected by the considered parameters. It is also found that the local Nusselt number Nu Y decreases on the bottom wall as c increases (magnetic field changes its direction from the horizontal to the vertical direction) and vice versa for the top wall of the cavity. The reported results are in good agreement with the available published work in the literature.

International Journal of Heat and Mass Transfer, 2011

... al. [21], Alchaar et al. [22], Chamkha and Al-Naser [23], Mahmud et al. [24], Hossain et al. ... more ... al. [21], Alchaar et al. [22], Chamkha and Al-Naser [23], Mahmud et al. [24], Hossain et al. [25] and Ece and Büyük [26], Zeng et al. [27], Mahdy et al. [28], Ramambason and Vasseur [29], Postelnicu [30], Nield [31], etc. However ...

International Journal of Heat and Mass Transfer, 2009

In this paper we investigate theoretically the unsteady boundary layer flow and heat transfer ove... more In this paper we investigate theoretically the unsteady boundary layer flow and heat transfer over a permeable shrinking sheet with non-uniform heat source. The nondimensional governing equations have been solved numerically using the bvp4c function from Matlab for different values of the pertinent parameters;

Pharmacology & Pharmacy, 2014

The reimbursement model for pharmaceutical care remains a barrier to successful widespread implem... more The reimbursement model for pharmaceutical care remains a barrier to successful widespread implementation of pharmacist-provided services. In some instances, community pharmacists have been successful in obtaining direct compensation for services from patients; however, evidence suggests that lack of patient demand for pharmacist-services may ultimately undermine the campaign for widespread third-party payment. The purpose of this study is to conduct a secondary analysis of data indicating consumer/patients' rationale for not purchasing pharmacist-provided disease management services when offered the opportunity to do so in community pharmacies. Our review of the data indicates that while financial concerns are clearly important in consumer demand for pharmacist-provided services, other considerations exist. The consumer/patient belief that pharmacist-provided services are duplicative or that these services are not needed are significant barriers to overcome. Intensive education and marketing campaigns are needed to sway consumer opinion on the value of pharmacist-provided services.