Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering

Management of construction materials crushing activities

2024-01-19T09:05:38+02:00

In this paper, the author presents aspects often encountered on construction sites related to management and organization activities when mobile crushers with hammers are used. Cases of good practice are detailed (with aspects of maintenance and selection of appropriate work technology) so that the work is executed on the required deadline, with increased efficiency, and the life span of the technological equipment is maximized. Also, the theme of the work is of interest to specialists in the field of site organization and management.

Management activities for construction of a dike

2024-01-19T09:08:25+02:00

The dike is an engineering construction and is a component part of the hydrotechnical arrangements. A case study regarding the management of the construction activities of a dike is described in this paper. Alternative mechanization options are presented, and their selection criteria were to fit into the execution period and financial efficiency. In this sense, a calculation of premeasurements, required construction machines, number of hours of their operation, specific fuel consumption, working days for each activity is presented.

Analysis of a power supply solution using renewable sources

2024-01-19T09:11:06+02:00

This paper aims to determine a solution for the power supply (off-grid solution) using a photovoltaic cell equipment designed based on the analysis of the factors that influence the annual performance of the photovoltaic modules.
The solution is based on the advantage in making solar panels that can be sized according to the application, to provide the values imposed by voltage and current. In this application, there will be used cell panels with 24V voltage in vacuum and 4A current in short circuit, that is, 96W theoretical power. The connection of the cells will be done following an efficiency analysis.

Parametric modelling for tower crane with tilting boom

2024-01-19T09:14:16+02:00

This paperwork shows a constructive solution for a tower crane with tilting boom assembly. The 3D model of this assembly is optimized on the basis of a Technical Calculation Method Summary Sheet. For modelling of 3D assembly Inventor 2020 design soft was used. With this soft we have the possibility to create products within a much shorter time period, therefore high productivity.

The influence of the car fleet on air quality

2024-01-19T09:19:35+02:00

The present work highlighted the influence of road traffic on the concentration of particulate matter in an area of Braila municipality. For this work, an area in the municipality of Braila was chosen which included both a street with heavy road traffic and a residential complex of houses with moderate road traffic.

Determination of pcb types and concentrations in industrial transformer oil samples

2024-01-19T09:23:30+02:00

This paper aims to present how the types and concentrations of PCBs contained in a sample of oil from high voltage industrial transformers can be determined. The chromatographic method (GC-ECD) was applied to determine the PCB concentrations in the collected oil sample. For the implementation of the GC-ECD method, an Agilent - 7890 gas chromatograph was used, equipped with a μECD detector (ionizing source: Ni63, A = 15 mCi) capable of ionizing and identifying the concentrations of chlorinated organic substances in the analyzed samples. The experimental program started by collecting an oil sample from an industrial transformer from the company ELEROM S.A., Neamt county, Romania and temporarily stored, for final disposal, in the dedicated storage facilities of the company SetCar S.A. Braila, Romania. The high PCB content in the oils from high-voltage industrial electrical equipment classifies them as hazardous waste with a negative impact on environmental factors and human health and must be managed according to the laws in force.