http://arthra.ugal.ro/handle/20.500.14043/24704 Tue, 21 Apr 2026 14:05:05 GMT 2026-04-21T14:05:05Z http://arthra.ugal.ro/handle/20.500.14043/24726 Humidity Determination in Concrete by Using the Dielectric Method Ionescu, Ștefania The presence of humidity in the building envelope elements decays their structural and technological properties, favours heat losses and, in time, also the deterioration and degradation of the building. In order to avoid of these aspects it is necessary to know and to mantain under control the level of humidity at the construction materials, in the process of making as well as during their exploitation; it is also necessary to be familiar with the transport phenomena of the humidity in the respective materialş, thirdly it is also obligatory to monitor the spacetemporary movement of the humidity front. This article analyses an electric-dielectric method, which besides the fact that it shows, measures and monitorises the level of humidity in the construction elements, also helps to appreciate the efficiency of some surface protection systems in concordance with the german guide regarding the protection and repairing of the concrete elements. The Annals of ''Dunarea de Jos'' University of Galati Fascicle XIV MECHANICAL ENGINEERING, ISSN 1224 - 5615 Sat, 01 Jan 2011 00:00:00 GMT http://arthra.ugal.ro/handle/20.500.14043/24726 2011-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/24725 Optimazation of Ultrasonic Flow Meters for Crude Oil Metering and Export Yeboah, Kuma; Nedelcuț, Florin Ultrasonic flow meters, as all velocity or inference type devices, require an adequate flow stream conditioning in order to assure an accurate performance. Typical flow conditioning consists of straightening the upstream and downstream of the measuring section. The upstream section usually contains a tube bundle, which allows the upstream section to be reduced in length. This tube bundle serves to eliminate any swirl in the flow stream before reaching the meter, presenting a symmetrical velocity profile to the turbine rotor. Some ultrasonic flow meters may produce a non-uniform pulse output, which can prove a wide span of repeatability. For such cases where is a need to correct the velocity flow profiles which affect the robustness of the integration method, this research work tries to develop a mathematical modeling and simulation in MATLAB and Microsoft Excel, with the purpose to combine the individual acoustic path measurements into a full volumetric flow rate measurement procedure. The relationship between velocity and viscosity, using Reynolds Number, was calculated in Microsoft Excel. The Nusselt Number was then used to plot fluid mean temperature and wall temperature diagrams in Microsoft Excel. The Annals of ''Dunarea de Jos'' University of Galati : Fascicle XIV : MECHANICAL ENGINEERING, ISSN 1224 - 5615 Sun, 01 Jan 2012 00:00:00 GMT http://arthra.ugal.ro/handle/20.500.14043/24725 2012-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/24724 Energy Dissipation Device Using Fluid Dampers Șcheaua, Fănel; Nedelcuț, Florin This scientific paper presents a solution that is adequate for the seismic isolation of small and medium size buildings and bridges. Comprising two seismic isolating devices, the described arrangement is suitable for dissipating an increased level of energy induced to infrastructure by the seism. As other hybrid arrangements, this one uses viscous dampers in order to limit the distance of induced movement of the infrastructure. The internal design of the fluid damper is analyzed using CFD software, to ensure a proper dissipation of the seismic action and to limit its destructive effects. The Annals of ''Dunarea de Jos'' University of Galati : Fascicle XIV : MECHANICAL ENGINEERING, ISSN 1224 - 5615 Sun, 01 Jan 2012 00:00:00 GMT http://arthra.ugal.ro/handle/20.500.14043/24724 2012-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/24723 Influence of structure Mass on the Behavior of Seismic Energy Hidraulic Dissipation Devices Șcheaua, Fănel; Gavril, Axinti Since many solutions exist today in the field of structure isolation against the destructive action of earthquakes, the authors present a simple solution that can provide complete protection against shock and vibration both as a result of road traffic and seismic actions. The proposed solution is represented by hydraulic energy dissipation device, as a passive system for structural isolation. Based on a case study, is highlighted the evolution of involved parameters in device operation according to isolated structure mass. The Annals of ''Dunarea de Jos'' University of Galati : Fascicle XIV : MECHANICAL ENGINEERING, ISSN 1224 - 5615 Sun, 01 Jan 2012 00:00:00 GMT http://arthra.ugal.ro/handle/20.500.14043/24723 2012-01-01T00:00:00Z