Universitatii street

Oradea, Romania

Universitatii street

Oradea, Romania
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Hortolomei M.,Grigore T. Popa University of Medicine and Pharmacy | Hortolomei M.,Universitatii Street | Popovici I.,Grigore T. Popa University of Medicine and Pharmacy | Popovici I.,Universitatii Street | And 2 more authors.
Farmacia | Year: 2012

The objective of the present paper was to study the influence of some formulation factors - such as the surfactant: co-surfactant ratio and the proportion of hydrophilic: lipophilic phase-on the conditions of formulation, preparation and physicochemical characteristics of avocado oil dermal microemulsions obtained with sucrose esters. In the first phase of the study we prepared three series of formulations where the proportion of surfactant: co-surfactant (sucrose laurate: Transcutol) (SL: TC) varied as follows: 1: 1, 1: 3 and 3: 1, respectively. In the second phase of the study we selected and prepared five microemulsion formulations labeled F1-F5, in which the SL:TC (1: 1) percentage was constant, along the dilution line 70, while the hydrophilic: lipophilic phase ratio varied in the following proportions: 1: 5, 1: 2, 1: 1, 2: 1 and 5: 1, respectively. The microemulsions were characterized by the determination of the following parameters: electrical conductivity, rheological behaviour, pH, transepidermal water loss coefficient. The data obtained demonstrated that: the analyzed formulations belong to the Newtonian fluid flow category; electrical conductivity increased directly proportional to the percentage of hydrophilic phase in the formula and the pH was in the near-physiological range; F3-F5 formulations containing > 15% hydrophilic phase in the formulation had a strong moisturizing effect. The microemulsions were well tolerated on the skin and no irritant effect was recorded.


Lupu C.,Polytechnic University of Bucharest | Bandici L.,University of Oradea | Bandici L.,Universitatii Street
Journal of Electrical and Electronics Engineering | Year: 2012

Systems with inverse model represent one of the successful solutions for the real-time control of the nonlinear processes. The use of these structures imposes solving some specific problems, like determination of static characteristic of the process, construction of inverse model or robust control law design. The paper proposes a structure and the correspondent methods of designing and implementation of inverse model command for control of a multivariable process with nonlinear characteristics. The applicability of the method is proved using a real-time structure with RST control algorithms. In the end, its software implementation and the obtained results are also shown.


Popovici O.,University of Oradea | Popovici O.,Universitatii street | Hoble D.A.,University of Oradea | Hoble D.A.,Universitatii street
Journal of Electrical and Electronics Engineering | Year: 2012

The reversible fuel cell can be used to produce hydrogen. The hydrogen is further the chemical energy source to produce electrical energy using the fuel cell. The ambient temperature will influence the parameters of the hydrogen fuel cell.


Leuca T.,University of Oradea | Leuca T.,Universitatii street | Palade P.A.,University of Oradea | Palade P.A.,Universitatii street | And 2 more authors.
Journal of Electrical and Electronics Engineering | Year: 2011

The paper presents a study of electromagnetic field processing of semi-manufactured wood in RF structures at 13.56 MHz. The staggeredthrough- field applicator is used and the advantages of this applicator for the semi-manufactured wood processing are highlighted. The benefits over conventional heating and drying methods of RF heating are discussed, and also the advantages over microwave heating for this specific application are mentioned. The experimental results, assisted with numerical modelling allow the establishment of optimum parameters for RF wood drying.


Palade P.A.,University of Oradea | Palade P.A.,Universitatii Street | Leuca T.,University of Oradea | Leuca T.,Universitatii Street | And 2 more authors.
Journal of Electrical and Electronics Engineering | Year: 2011

The paper presents a study of electromagnetic field processing of semi-manufactured wood in microwave structures. Water presents a support for high frequency electromagnetic field conversion into heat. This characteristic presents an important advantage in the drying process. A multimode applicator is used and the advantages of this applicator for the semi-manufactured wood processing are highlighted. The benefits over conventional heating and drying methods of microwave heating are discussed, and also the advantages over RF heating for this specific application are mentioned. The numerical and experimental results allow the establishment of optimum temperature for drying wood in a high frequency electromagnetic field. A multi-physics analysis is performed.


Palade P.A.,University of Oradea | Palade P.A.,Universitatii Street | Leuca T.,University of Oradea | Leuca T.,Universitatii Street
Journal of Electrical and Electronics Engineering | Year: 2011

The paper presents a study of an empty multimode microwave resonant cavity. In the first part, we present a Matlab GUI (Graphical User Interface) that calculates the possible modes and the corresponding resonant frequency inside an empty cavity that is also being displayed and the modes number variation with the cavity dimensions is discussed. Using the electric and magnetic field components for a rectangular empty cavity, we developed a Matlab GUI that can plot the field inside the cavity at a given observation plane, in the three directions, for a specific mode and resonant frequency. Even if an empty cavity is not used in a real heating application, the study and the developed GUI still have an importance from a academic point of view, given the reader/user an inside an how microwave cavities operate and a better understanding. The dissipated power distribution and its uniformity is also discussed, considering the fact that it is proportional with the electric field. Cavity size is one important factor in improving energy deposition uniformity. While the paper discuses only the rectangular cavity for the sake of ease of analysis, the same principles apply to other geometries as well.

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