http://arthra.ugal.ro/handle/20.500.14043/25898 Sun, 12 Apr 2026 11:38:34 GMT 2026-04-12T11:38:34Z http://arthra.ugal.ro/handle/20.500.14043/25924 Air Quality Monitoring in Galați. Case Study Balint, Lucica; Rîpă, Minodora; Balint, Simion Ioan; Niță, Petre Stelian; Năstase, Gina This paper presents information referring to the variation of aerosols concentration in a central area in Galati. For a period of time of november2005 to november 2006, there have been made correlations between aerosols concentrations and the predominant wind directions (E~W, N~NE~S-SW). The results of the measurements are specific only for a point in time, being influenced by random variables (traffic intensity, temperature, pressure, wind speed, humidity etc.). The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science ISSN 1453 – 083X. N0. 2 – 2006 Sun, 01 Jan 2006 00:00:00 GMT http://arthra.ugal.ro/handle/20.500.14043/25924 2006-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/25923 Behavior of Welded Joints from Some Stainless Austenite Steel Eypes During Nitriding Process Dima, Ovidiu Researches made on welded and nitrided samples from stainless austenite steel types show that nitriding thermo chemical treatment can be applied also for welded joints. As a result of the treatment, a diffusion layer with austenite dendritic layer was obtained, max hardness of 500 HV005- The layer's depth depends on the finishing degree of the structure. The finer the dendritic structure is the slower the diffusion process and smaller the layer depth. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science Sun, 01 Jan 2006 00:00:00 GMT http://arthra.ugal.ro/handle/20.500.14043/25923 2006-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/25922 Hardened Aluminium with Discontinuous Copper Threads Potecașu, octavian; Potecașu, Florentina; Alexandru, Petrică The paper presents the influence of the quantity of discontinuous reinforced threads on the mechanical characteristics of some samples obtained through deformation from composite material with metallic matrix. As a raw material for obtaining the matrix it was used aluminum powder and as a reinforcing phase, short and long copper threads with different volumetric percentages. The products have been plastically deformed at a final diameter of 3mm. The presence of the copper threads dispersed in the aluminum matrix in quantities of up to 16% copper (volumetric percentages), determines the hardening of the composite material. Above this limit the increase in the quantity of copper is no longer justified as it begins fragilizing the aluminum matrix. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science ISSN 1453 – 083X. N0. 2 – 2006 Sun, 01 Jan 2006 00:00:00 GMT http://arthra.ugal.ro/handle/20.500.14043/25922 2006-01-01T00:00:00Z http://arthra.ugal.ro/handle/20.500.14043/25921 Some Issues Concerning Gear Wheels Fabrication by Sintering Olevschi, Alexandru Powder metallurgy appeared in the XVIII century as result of industrial market demand for electric bulbs filaments made of wolfram. Nowadays powder metallurgy is applied in such fields as: automotive industry (cylindrical or conical gear wheels), fine mechanics (components for calculation devices), toys production industry, electrical engineering (field poles for electrical fittings), machine building industry (filters, gear wheels, levers). In this work some applications of metallic powders in the fabrication of gear wheels are presented. As well the possibilities for their utilization in conical gear wheels of precessional planetary transmissions are described. The Annals of "Dunarea de Jos" University of Galati Fascicle IX Metallurgy and Materials Science ISSN 1453 – 083X. N0. 2 – 2006 Sun, 01 Jan 2006 00:00:00 GMT http://arthra.ugal.ro/handle/20.500.14043/25921 2006-01-01T00:00:00Z