Considering the advantages of steel surface hardening, when less expensive low-and medium-carbon steels can be surface hardened without the problems of distortion and cracking associated with the through hardening of thick sections, we developed some research entailing the increase in environmental performance of iron powders carburizing process using methane as carrier. Apart of studies on optimal working parameters and methods, our research addresses improvements in environmental performance of process by selecting powders suppliers, reducing raw materials and energy consumptions, considering products life cycle analysis. A comparison is also performed among the characteristics of three series of research for obtaining ecological steels for automotive industry.
This paper presents aplying a multi-criteria decision methods to evaluate an optimum photovoltaic module for the construction of a solar park. In this work, seven number of alternative of photovoltaic modules and four criteria for selection is used for the optimal solution. The result from the research demonstrate which of the analyzed PV modules is the most convenient to be used for construction of a solar park.
Abstract. The treatments of the hardened parts at low temperatures have like main goal the reducing of the amount of retained austenite through its transformation to martensite under the action of the strong contractions which occur in cryogenic environments. In the case of sintered steels such researches were achieved on a small scale. The paper presents results of research regarding the cooling in medium of dry ice and respectively of liquid nitrogen, for the three groups of sintered steels with structural carbon content of 0.54%, 0.75% and 0.92% sintered at 1150 0 C for 60 min and oil quenched.
Human resources are the only ones capable of producing and reproducing all the other resources available to an organization. People are the active resources of the organization because their potential contributes to increasing organizational efficiency and effectiveness. The authors make a bibliographic research on human resource management and the new methods used in it. Following the results obtained, a conceptual model for efficient human resource management is proposed, developing both an architecture and a graphical application interface. The application is used internally and emphasizes the tasks of each employee and his / her personality on motivation and opinion.
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