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 441-460 of 1845
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A Study on the Prediction of Stability Behaviour for Flexible Rotor in Journal Bearings
(Universitatea "Dunărea de Jos" din Galaţi, 2007)The influence of the labyrinth seals on the dynamic behaviour of a flexible rotor in journal bearings is investigated. In particular a code which makes possible the determination of the stiffness and damping coefficients ... -
A Comparation of Standardized Methods for Lubrication Failure Determination
(Universitatea "Dunărea de Jos" din Galaţi, 2007)Lubricants are used to prevent wear between moving parts and to resist to high pressure between them. There are standardized testing methods that determinate the wear of the contact pair pieces and the pressure that leads ... -
Durabilyty of Friction Pairs With Functionality in Abrasive Randomly Particles
(Universitatea "Dunărea de Jos" din Galaţi, 2007)It is shown that the abrasive particles, which penetrate in the convergent joint of friction pairs, can damage the superficial layer of surfaces. The wear caused by individual particle depends on having both a satisfactory ... -
Neural Networks Based Study of Friction Coefficient Variation in Sliding Bearings
(Universitatea "Dunărea de Jos" din Galaţi, 2007)The paper presents the possibility of using the neural networks approach for the analysis of friction coefficient evolution in case of sliding bearings. Several non-metallic bearing materials are investigated, both with ... -
The Level of Confidence for a Ship Hull Girder
(Universitatea "Dunărea de Jos" din Galaţi, 2007)Structural estimation consists in a set of activities done to certificate security and reliability of an existing ship for its residual service life. Depending on ship’s type and damages, there are alternatively evaluation ... -
Study on the Specific Effects of Corrosion processes on Ancient Bronze Artefacts
(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
(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
(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 ... -
Grain Refinement in Aluminum Alloys by Acoustic Cavitation Phenomena
(Universitatea "Dunărea de Jos" din Galați, 2007)In this article, ultrasonic method of transmitting forced vibrations to solidifying aluminum-alloy melts is presented. In the presence of well developed cavitation situations, a fine and homogeneous microstructure has ... -
Steel Flow Control of Continuous Casted Slabs Using Submerged Entry Nozzle Exchange System for Tundish
(Universitatea "Dunărea de Jos" din Galați, 2007)In the steel making process, the continuous casting of molten steel is a very important step which involves hi-tech facilities. The flow control is a very important issue that influences the quality of the final products. ... -
Experimental Researches on the Constitutive Equation of Concrete Steel with Superior Characteristics
(Universitatea "Dunărea de Jos" din Galați, 2007)The plastic deformation behavior is defined by the function of the deformation strength according to the strain, strain rate and temperature as the factor of the deformation process. The behavior law establishes by the ... -
Austenitic Stainless Steels Corrosion Properties Modified by Silicon Alloying
(Universitatea "Dunărea de Jos" din Galați, 2007)In the present paper there are presented results concerning comparative corrosion resistance of some austenitic stainless steels, with or without silicon content. The silicon content is varying in the range of 1-5 %, in ... -
Structure-Properties Corelation in Sintered Hard Alloys with High Toughness and Strength
(Universitatea "Dunărea de Jos" din Galați, 2007)The researches effectuated until now in the field of sintered hard alloys based on metallic carbides have the aim to improve them properties through modifications of existing technologies and by creating other news ones, ... -
Structure and Corrosive Firmness of Composition Materials on the Basis of Copper and Molybdenum got Method Electron-Beam TechnologyB
(Universitatea "Dunărea de Jos" din Galați, 2007) -
Studies Concerning Energetic Consumption of Some Heating Equipments with Resistors
(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 ... -
Behaviour at Nitriding in Fluidized Layer of Austenitic Stainless Steels at the Temperature
(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 ... -
Analysis of Steructural Components Exiting in Steel Making Slag Sampled from Steel Making-Continuous casting Flow Sheet
(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 ... -
Multifunctional ZnO-Based thin Films by SOL-GEL Method
(Universitatea "Dunărea de Jos" din Galați, 2007)The paper presents the crystalline structure, morphology, optical transmittance, electrical properties and room temperature photoreduction-ozone oxidation properties of some Al-doped ZnO thin films prepared by sol-gel ... -
The Monitoring of Chattering in Cold Rolling Mill System with Stands for Thin Strip
(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 ... -
Manufacture of Stud Link Chain Cable Made of Grade U1 and U2 Steel
(Universitatea "Dunărea de Jos" din Galați, 2007)We have analyzed the fabrication technology of the link chain cable made of grade U1 and U2 steel from TREFO S.A. Galati and we had in view during the experiments several rolling programs. The main characteristics of a ...
