Transilvania University of Brașov is a public institution of higher education in Brașov, Romania. It has sixteen faculties, a total of 25,000 students and 800 teachers. The University offers 103 days license areas, 12 areas for Distance Education, and 5 areas for higher reduced frequency, as well as 17 graduate programs and 14 doctoral programs. Wikipedia.
Postelnicu A.,Transilvania University of Brasov
International Journal of Heat and Mass Transfer | Year: 2012
The present paper is focused on the analysis of heat and mass transfer in boundary-layer free convection over an inclined flat plate embedded in a fluid saturated porous medium in the presence of thermophoresis. The governing equations are transformed into a set of coupled differential equations, which are solved numerically using the local non-similarity method. A comparison between the results given by this method and the local similarity method is also presented. For various values of the problem parameters, graphs of thermophoretic wall velocity, Nusselt number and concentration profiles in the boundary layer are presented. Variation of the dimensional thermophoretic wall velocity along the plate for different angles of inclination are presented in a physical relevant case. © 2011 Elsevier Ltd. All rights reserved.
Postelnicu A.,Transilvania University of Brasov
International Journal of Heat and Mass Transfer | Year: 2010
In this paper there is studied the effect of a horizontal pressure gradient on the onset of Darcy-Bénard convection in a fluid-saturated porous layer heated from below, when the fluid and solid phases are not in local equilibrium. In the context of a linearized stability analysis, the problem is transformed into an eigenvalue equation. The problem, when cast in dimensionless form, contains three parameters (the pressure gradient, the porosity-scaled conductivity ratio and the scaled inter-phase heat transfer coefficient). This problem is solved numerically by using two methods: Galerkin approach and the numerical solver dsolve from Maple and comparisons between these methods are performed. Critical values of Rayleigh number, wave number and frequency are obtained for various values of the problem parameters. © 2009 Elsevier Ltd. All rights reserved.
Falup-Pecurariu C.,Transilvania University of Brasov
Journal of Neural Transmission | Year: 2013
Fatigue is a frequently encountered non-motor symptom in Parkinson's disease (PD). Being a subjective definition, with no biological markers, it is difficult to describe. Its definition is influenced by the background and culture of the patient. Subtypes of fatigue are peripheral fatigue and mental fatigue. The co-existence of other non-motor symptoms in PD complicates its assessment. Fatigue could be present before, at the time of diagnosis of PD in untreated patients or during the course of the disease. Scales that can be used for evaluation include generic one for a holistic manner and those specifically designed for PD. A scale designed for fatigue should differentiate between PD patients with fatigue and those without fatigue. The next step is to choose between unidimensional which evaluate one dimension and multidimensional scales. We present the main scales which can be used for fatigue assessment and their properties. The scales are presented with some psychometric properties in non-PD population and those properties through validation in PD population. Scales have some properties which could be recommended for screening and/or rating of severity of fatigue in PD. © 2013 Springer-Verlag Wien.
Visa M.,Transilvania University of Brasov
Applied Surface Science | Year: 2012
Used as adsorbent, alkali fly ash represents a low cost solution for advanced wastewater treatment. The alkali treatment raises sustainability issues therefore, in this research we aim to replace alkali fly ash with washed fly ash (FAw). For improving the adsorption capacity of washed fly ash, bentonite powder (B) was added, as a natural adsorbent with a composition almost identical to the fly ash. The new adsorbent was characterized by AFM, XRD, FTIR, SEM, EDS and the surface energy was evaluated by contact angle measurements. For understanding the complex adsorption process on this mixed substrate, preliminary tests were developed on synthetic wastewaters containing a single pollutant system (heavy metal), binary (two-heavy metals) and ternary (dye and two heavy metals) systems. Experiments were done on synthetic wastewaters containing methylene blue, cadmium and copper, using FAw, B and their powder mixtures. The pseudo-second order kinetics could well model all the processes, indicating a good adsorbent material which can be used for the pollutants removal from wastewater. After adsorption the substrates loaded with pollutants, annealed at 500 °C can be reused for padding in stone blocks. © 2012 Elsevier B.V.
Talaba D.,Transilvania University of Brasov
Robotics and Computer-Integrated Manufacturing | Year: 2012
Typical kinematic and dynamic analysis of mechanisms considers the joints just as theoretical constraints. Nevertheless, for some particular kinematic joints (e.g. spherical joints) the physical realization takes the shape of distinct components that are attached to the adjacent bodies. While a spherical joint allows three theoretic relative rotations, except the self rotation of the shaft the other two rotations have a reduced range because of constructive limitations. In this paper we propose a function named angular capacity to represent the range of the physically permitted motion in a spherical joint. A graphical representation of the angular capacity is also proposed to intuitively illustrate the relative motion range and the constructive parameters that influence it are identified. Angular capacity of a spherical joint is defined as a constructive feature of the joint assembly - out of the mechanism context - but also as a motion range demanded by the mechanism from the spherical joint. For the first case general relations have been proposed for the constructive angular capacity calculation and useful consideration has been made for the embodiment design of the spherical joints. For the latter, a complete methodology and relationships for mechanisms with two degrees of mobility are proposed as well. Finally, the suspension-steering mechanism of the passenger cars is presented as a use case. © 2012 Elsevier Ltd.