Scientific papers - Annals of "Dunarea de Jos" University of Galati - Analele științifice ale Universității "Dunărea de Jos" din Galați: Recent submissions

Afișează articolele 141-160 of 1845

    • Severe Plastic Deformation an Advanced Method for Nanostructuring Shape Memory Alloys 

      Gurău, Gheorghe; Gurău, Carmela; Tănase, Dinel; Drugescu, Elena (Universitatea "Dunărea de Jos" din Galați, 2007)
      Severe plastic deformation (SPD) is an advanced plastic deformation. In this process nanostructuring metals and alloys may be produced. Nanostructured shape memory alloys are associate with a very high strength, toughness, ...

    • Analysis of Steructural Components Exiting in Steel Making Slag Sampled from Steel Making-Continuous casting Flow Sheet 

      Preda, Adriana; Ivan, Ion; Zăman, Florin (Universitatea "Dunărea de Jos" din Galați, 2007)
      Hereby paper work aims to identify and analyze the structural constituents from the steel making shop slag. Therefore, slag specimens sampled from different stages of steel making-continuous casting flow sheet in Mittal ...

    • Behaviour at Nitriding in Fluidized Layer of Austenitic Stainless Steels at the Temperature 

      Dima, Ovidiu (Universitatea "Dunărea de Jos" din Galați, 2007)
      Nitriding at low temperatures, 450-500oC of austenic stainless steels lead to the obtaining of the tough layers over 1000 HV005 but having thicknesses of tenths of microns. Moreover, nitriding at 500ºC has determined the ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 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 ...

    • 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 ...

    • 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, ...

    • 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 ...

    • Prediction of Buckling and Postbuckling Behaviour of Composite Ship Panels 

      Chirică, Ionel; Beznea, Elena Felicia; Chirică, Raluca; Boazu, Doina (Universitatea "Dunărea de Jos" din Galați, 2007)
      The behavior of ship plating normally depends on a variety of influential factors, namely geometric/material properties, loading characteristics, initial imperfections, boundary conditions and deterioration arising from ...

    • Electric and Electromagnetic Properties of Fiber Fabric Based Filled Epoxy Composites 

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

    • Electromagnetic Strip Mills' Driving Rollers Metallisation Advanced Technics 

      Motoiu, Petra; Dumitrescu, Daniela; Fratila, Cornel; Trusca, Dacia (Universitatea "Dunărea de Jos" din Galați, 2007)
      The continuous increase of the applications of thermal sprayed coatings together with the demand for layers having always more and more enhanced performances and properties stimulates the research activity toward ...

    • Structural and Tribological Aspects on Ti(C,O,N) Magnetron Reactive Sputtered Thin-Films 

      Munteanu, Daniel; Olteanu, Camelia; Ionescu, Cristian; Munteanu, Alexandru; Vaz, Filipe; Cunha, Luis (Universitatea "Dunărea de Jos" din Galați, 2007)
      Magnetron sputtering is a flexible technique and allows producing a significant amount of types of coatings. Within the frame of present work, Ti-C-O-N thin films were deposited onto high-speed steel (AISI M2), substrates ...

    • Basic Mathematical Modeling of the Environmental Processes in the Lower Danube Region [I] 

      Munteanu, Viorel; Costea, Ovidiu (Universitatea "Dunărea de Jos" din Galați, 2007)
      In most environmental pollution problems, the pollutant is released to the environment by the, almost always, turbulent flow of a carrier fluid. The pollutant mixes with the surrounding fluid (air or water) and undergoes ...

    • The Influence of Cold Rolling on the Microstructure for Drawing Steels 

      Potecașu, Florentina; Potecașu, octavian; Drugescu, Elena; Alexandru, Petrică; Istrate, Miltiade; Hanganu, Doru (Universitatea "Dunărea de Jos" din Galați, 2007)
      The paper presents the structural changes that appeared in steel for deep drawing, as a result of cold rolling and of recrystallization thermal treatment. The research was conducted on samples taken from the rolled strap, ...

    • Experimental Investigation of Fatigue of Thin-Walled Welded Structures of Commercial Vehicle Frames 

      Fokilidis, Athanassios; Savaidis, Georgios (Universitatea "Dunărea de Jos" din Galați, 2007)
      The fatigue behavior of bus frame components consisting of thin-walled tube beams joined together by fillet welding has been investigated. Numerical analysis by means of finite elements and experimental stress analysis ...

    • Mechanical Resistance as a Function of Local Properties 

      Chiriță, George; Ștefănescu, Ioan; Soares, Delfim; Silva, Filipe (Universitatea "Dunărea de Jos" din Galați, 2007)
      The present study makes an estimation of an automotive engine piston mechanical properties and fatigue life based on some characteristics of metallurgical microstructure. Because it is intended to assess the properties ...