of Cluj Napoca, Romania
of Cluj Napoca, Romania

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Borbas L.,Budapest University of Technology and Economics | Szava J.,Stejerisului str.1 | Galfi B.-P.,Transilvania University of Brasov | Kakucs A.,Sapientia University of Cluj Napoca
Transactions of Famena | Year: 2012

In literature, one can usually find experimental investigations into global mechanical behaviour of soft-wood specimens, but properties of their individual components, (namely the properties of the late-wood and the early-wood parts) are rarely presented. Therefore, information on the moisture content and on the density is presented here. In fact, the ratio of the early- and late-wood parts in the cross-sectional area represents a significant influential factor, especially in the case of soft-wood components. Based on previous experimental data bases, the authors offer an original and simple analytical method for establishing Poisson's ratios for new, untested soft-wood specimens.

Strnad G.,Petru Maior University of Targu-Mures | Jakab-Farkas L.,Sapientia University Of Cluj Napoca | Papp S.,Sapientia University Of Cluj Napoca | Fekete A.-Z.,Petru Maior University of Targu-Mures | And 2 more authors.
Applied Mechanics and Materials | Year: 2014

The paper presents the research work carried out in order to optimize the technology and a reactive magnetron sputtering system used for the deposition of hard, multielemental, multiphase coatings. On the basis of a model of the dynamic pressure developed and validated by us, regulatory structures for dynamic pressure inside the deposition chamber were designed and implemented. By using this optimization, extensive experiments involving nanostructured (Ti, Al, Si)N coatings, with a thickness of approx. 2 μm, were carried out. Using TEM microscopy, SAED and Vickers microhardness characterizations the results of deposition system optimization on the microstructure and microhardness of thin films was investigated. © (2014) Trans Tech Publications, Switzerland.

Vlad C.,Transilvania University of Brasov | Pasztor J.,Sapientia University of Cluj Napoca | Forgo Z.,Sapientia University of Cluj Napoca | Bratucu G.,Transilvania University of Brasov
Bulletin of the Transilvania University of Brasov, Series II: Forestry, Wood Industry, Agricultural Food Engineering | Year: 2013

Preparing the germination bed represents an essential work for growing and developing plants in vegetable farming. The machinery used can have a positive or negative influence on improving or degrading the soil's physio-mechanic characteristics and on the quality of the work, therefore choosing them requires a lot of attention. These aspects are a result of studying the kinematics and work process of the complex aggregate that is used during this stage.

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