http://arthra.ugal.ro/handle/20.500.14043/24671 2026-04-16T14:33:58Z 2026-04-16T14:33:58Z Şolea, Liviu Cătălin Ştefănescu, Ioan Zgherea, Gheorghe Creţu, Romică http://arthra.ugal.ro/handle/20.500.14043/24682 2020-09-03T13:27:39Z 2013-10-01T00:00:00Z

Some Physical Changes in Extra Virgin Rapeseed Oil after the Process Şolea, Liviu Cătălin; Ştefănescu, Ioan; Zgherea, Gheorghe; Creţu, Romică The aim of this study is the viscosity’s evolution depending on the temperature and the shear rate and the analysis at the transmittance spectra of the oxidized rapeseed oil. Rapeseed oil was oxidized at the temperatures of 110°C, 120°C, 130°C, the periods of time of oxidation being 5 to 10 hours. An increase of viscosity depending on the increase of oxidation temperature and oxidation time is to be noticed. Increasing of the oxidation temperature and the period of oxidation is the cause of the progressing color difference of the oxidized oils comparied to non-oxidized rapeseed oil.

2013-10-01T00:00:00Z Şolea, Liviu Cătălin Creţu, Romică http://arthra.ugal.ro/handle/20.500.14043/24681 2020-09-03T13:27:39Z 2013-10-01T00:00:00Z

Spectrophotometric and Rheological Studies on Oxidized Soybean Oils Şolea, Liviu Cătălin; Creţu, Romică This paper presents a rheological and spectrophotometric study of oxidized and nonoxidized soybean oils at 100, 110 and 120°C temperatures. The oxidation periods of time were 5 hours and 10 hours. Changes of the oxidized oil transmittance spectra comparing to non-oxidized oil transmittance spectra were observed, and we emphasized the color differences which appeared following the oxidation phenomena. Meanwhile, an increase of the viscosity while increasing the oxidation parameters was noted. Spectrophotometric and rheological analysis can provide information on the degree of oxidation of vegetable oils. KEYWORDS: transmittance, viscosity

2013-10-01T00:00:00Z Şcheaua, Fănel Dorel http://arthra.ugal.ro/handle/20.500.14043/24680 2020-09-03T13:27:39Z 2013-10-01T00:00:00Z

Experimental Dynamics of a Bridge Deck Isolated with Rolling Pendulum System (RPS) Şcheaua, Fănel Dorel Base isolation of building structures represents the most important technique used worldwide at this moment. An innovative isolation system is presented in this article, whose passive type operating principle is based on rolling of spherical pieces on concave surface part. The isolation system is composed of two main plates and a spherical steel piece is interposed between. Spherical part is the piece that makes disconnection between foundation and superstructure, being able to roll on a concave surface. The disconnection between foundation and superstructure is essential so that ground movements as results of seismic actions are filtered and efforts that may request the structure are much lower in value. An experiment was performed in which a scaled bridge deck structure type was isolated with four isolation systems, in order to observe the behavior of the structure during a seismic action. The experimental results obtained are presented for acceleration in time and frequency, for the three main directions of movement.

2013-10-01T00:00:00Z Potârniche, Aurora http://arthra.ugal.ro/handle/20.500.14043/24679 2020-09-03T13:27:39Z 2013-10-01T00:00:00Z

Comparative Modal Analysis of a Rigid Structure with Conservative Insulation Potârniche, Aurora This paper deals with dynamics of compact rigid structures with elastic insulation and subjected to various vibratory, shock or seismic actions. It was supposed a simple rigid model with six degrees of freedom, affected by one or both vertical symmetry planes. Modal analysis was performed for six different rigidity cases. Concluding remarks dignify the correlation between isolation characteristics and natural pulsation in terms of eigenvalues and eigenvectors.

2013-10-01T00:00:00Z