Căutare Scientific papers - Annals of "Dunarea de Jos" University of Galati - Analele științifice ale Universității "Dunărea de Jos" din Galați după Data publicării

Afișează articolele 401-420 of 1845

    • Granularly unbind Materials for Casting Composite Moulds 

      Mărginean, Ioan; Târcolea, Mihai; Mirea, Vasile; Cocolas, Sorin-Adrian (Universitatea "Dunărea de Jos" din Galați, 2007)
      This paper present some partial result based on this idea (of pollution prevention) the domain of making composite-casting moulds (in time of casting, solidifying, and alloy cooling). Casting process impose temporary or ...

    • Reduction Rate of Remanent Stress in Thermal Spraying Depositions by Shot Peening 

      Teodoru, Leonard; Mihăilescu, Valentin (Universitatea "Dunărea de Jos" din Galați, 2007)
      Thermal electric-arc spraying coatings are widely utilized both to get new parts ant to repair the used ones. Just like with the other thermal spraying procedures, the other thermal spraying procedures, the thickness of ...

    • X-Ray Diffraction Residual Stress Measurements for Quality Control Testing 

      Gheorghieș, Constantin; Cantaragiu, Alina-Mihaela; Stasi, Iuliana Valentina (Universitatea "Dunărea de Jos" din Galați, 2007)
      This paper present the primary difficulties which are associated with the obtaining and interpreting surface X-ray diffraction residual stress results: the surface stresses may be identical for the shoot peening, nitriding ...

    • New Welding Techology-The Cold Welding on Cogged Surfaces 

      Georgescu, Bogdan; Georgescu, Valeriu (Universitatea "Dunărea de Jos" din Galați, 2007)
      Welding by cold pressing on cogged surfaces, produces the joint of a component made from an easy deformable metal by pressing on the cogged surface of a harder metal component. Different welds between aluminium (the ...

    • Some Results of Researches to Develop the Proper Recycling Methods of Technological Residues from Secondary Aluminum Industry 

      Roman, Maria; Teodorescu, Romanița; Firescu, Lucia; Crișan, Aurel; Mărginean, Ioan; Cocolaș, Adrian (Universitatea "Dunărea de Jos" din Galați, 2007)
      The objective of the research is to identify new suitable process to use residual waste (like aluminium secondary dross, salt slag or fly ashes) in concrete products according with sustainable industry concepts. The paper ...

    • Study and Researche Regarding Binaring Sistem with TIOBIS - β – NAFTOL 

      Mitoșeriu, Olga; Constantinescu, Stela; Orac, Lucica (Universitatea "Dunărea de Jos" din Galați, 2007)
      This paper presents the results for contribution of determining the manganese from waters and steel. Manganese, due to its properties, cannot be found but in acid waters and usually associated with iron. In small amounts, ...

    • Studies Concerning Energetic Consumption of Some Heating Equipments with Resistors 

      Minea, Alina; Carabet, Roxana (Universitatea "Dunărea de Jos" din Galați, 2007)
      In order to increase the resistance of aluminium alloys a complex heat treatment is usually performed. Therefore, we must consider the reaction time between aluminium alloys and furnace atmosphera. These atmospheres ...

    • Study of Heat Treatment Influence on Aluminum-Based Alloy ATN-Si10Cu4 

      Vasilescu, Elisabeta; Boiciuc, Simona (Universitatea "Dunărea de Jos" din Galați, 2007)
      This work presents the experimental results concerning the behavior on heat treatment of on aluminum based alloy. The laboratory level experiments achieved on samples of ATN-Si10Cu4 (4145 series) alloy illustrate the ...

    • Hydrogen production by Steam reforming of Renewable Raw Materials 

      Matei, Vasile; Mihai, Oana; Jugaru, Traian; Movileanu, Daniela; Borcea, Anca; Matei, Dorina (Universitatea "Dunărea de Jos" din Galați, 2007)
      The paper is based on study of steam reforming of renewable raw materials (bioethanol, biomethane) in stainless steel fixed bed reactor. The β-alumina catalysts with nickel has been synthesized and tested supported. The ...

    • The Monitoring of Chattering in Cold Rolling Mill System with Stands for Thin Strip 

      Dragomir, Ștefan; Dragomir, Georgeta; Spânu, Constantin (Universitatea "Dunărea de Jos" din Galați, 2007)
      Each system (stand – driving) and the continuous rolling line to which it belongs have its own functional and energetically parameters. To reduce any faults of the strip surface it is also necessary to check (eventually ...

    • Improvement of Steel Sheet Corrosion Resistance by Thermic Coverage Method with Zinc-Aluminium Alloys 

      Vlad, Maria; Olga, Mitoșeriu; Constantinescu, Stela; Stratulat, Emil (Universitatea "Dunărea de Jos" din Galați, 2007)
      The paper presents the main physico-chemical characteristics (viscosity and superficial tension of zinc-aluminium liquid alloy in view of carry out protected layers on steel sheet with very good properties by thermal ...

    • The Action of the Ultrasonic Vibration Over the Diffusion Process in Gases and Liquids 

      Ciurea, Aurel; Bordei, Marian (Universitatea "Dunărea de Jos" din Galați, 2007)
      Among the new method of studying the properties of the substance and the influence over the most various physical and chemical processes, used in different industrial domains, the main place is occupied by the usage of ...

    • Semi-Planetary Rolling and Changes of Fine Structure and Microstructure 

      Gheorghieș, C.; Cănănău, N.; Alexandru, P.; Petrea, I. (Universitatea "Dunărea de Jos" din Galați, 2007)
      The strain intensity in the proximity of planetary cylinder, in the case of semi-planetary rolling is greater than in the proximity of the massive cylinder. This fact leads at the variation of the microstructure and fine ...

    • Study of Tribocorrosion Processes by Electrochemical Techniques 

      Benea, Lidia; Drăgan, Viorel (Universitatea "Dunărea de Jos" din Galați, 2007)
      Tribocorrosion is defined as the chemical-electrochemical-mechanical process leading to a degradation of materials in sliding, rolling or erosion contacts immersed in a corrosive environment. That degradation results ...

    • Study on the Specific Effects of Corrosion processes on Ancient Bronze Artefacts 

      Sandu, Ion; Quaranta, Marta; Bejinariu, Costică; Sandu, Ioan Gabriel; Luca, Dorin; Sandu, Andrei Victor (Universitatea "Dunărea de Jos" din Galați, 2007)
      The paper presents the cases of the corrosion processes which take place on starting from the usage period when the primary patina is being formed and when the secondary patina starts, than continuing with the archaeological ...

    • Modelling and Prediction in Failure Processes by Mechanical Stresses in Corrosive Environment 

      Palaghian, Liviu; Thompson, Mioara; Băicean, Svetlana; Bucșă, Sorin (Universitatea "Dunărea de Jos" din Galați, 2007)
      The complex interaction effect of mechanical stress- mechanical systems and aggressive environment, leads, at dramatic decreasing of their durability and reliability. The analyze of physical-chemical processes such as: ...

    • Recycling Possibilities of Metallurgical Slag 

      Cioroi, Maria; Nistor (Cristea), Licuța (Universitatea "Dunărea de Jos" din Galați, 2007)
      The target of the current metallurgical industry is to recycle and utilize all their by-products. Slags are the important wastes and by-products of metallurgical industry, which have been treated, recycled and used ...

    • A study of Electric Properties of Fiber Fabric Based Filled Epoxy Composites 

      Andrei, Gabriel; Cîrciumaru, Adrian; Bîrsan, Iulian; Dima, Dumitru (Universitatea "Dunărea de Jos" din Galați, 2007)
      Electric and magnetic properties of laminate carbon fiber fabric based epoxy composites are investigated through experimental techniques. Various concentrations of powder fillers were used in order to change the basic ...

    • Values of the Solutal Marangoni Number in Very Dilute Fe-C-O Solutions at 1873K 

      Niță, Petre Stelian (Universitatea "Dunărea de Jos" din Galați, 2007)
      Low carbon, aluminum killed steels are well represented by the adequate part of the Fe-C-O system, where are available useful experimental data, regarding the surface tension and viscosity. The reference dynamic ...

    • Two-Way Shape memory Effect in a Cu-13wt. %Al-4 wt.%Ni Shape Memory alloy by the Thermo-Mechanical Cycling Method 

      Gurău, Carmela; Gurău, Gheorghe; Alexandru, Petrică (Universitatea "Dunărea de Jos" din Galați, 2007)
      A Cu - 13 % wt Al 4% wt Ni polycrystalline shape memory alloy has studied with a thermo mechanical cycling method. The two – way shape memory effect (TWSME) was obtained bending the alloy around a cylinder mold and by ...