NEW TECHNIQUES APPLIED IN ECONOMICS. ARTIFICIAL NEURAL NETWORK

The present paper has the objective to inform the public regarding the use of new techniques for the modeling, simulate and forecast of system from different field of activity. One of those techniques is Artificial Neural Network, one of the artificial inartificial neural network, economics, simulate, artificial intelligence

Tribological properties of solid lubricant nanocomposite coatings on base of tungsten disulphide nanoparticles

Tungsten disulphide (WS2) and molybdenum disulphide (MoS2), which belong to the family of transition metal dichalcogenides, are well known for their solid lubricating behavior. Thin films of WS2 and MoS2 exhibit extremely low coefficient of friction in dry enviroments, and are typically applied by sputter deposition, pulsed laser ablation, evaporation or chemical vapor deposition, which are essentially either line- of-sight or high temperature processes. In this paper we have investigated the tribological properties of embedded solid lubricant coatings from WS2 nanoparticles and compared them to monolithic and alloy films of the same constituents. The WS2/metal (Ti, W) nanocomposite were deposited on alloy substrate by magnetron sputtering. The patterning methods were used to create two component coatings in which WS2 were embedded in a Ti matrix. Coatings were deposited using sputter deposition, and co-deposition of WS2 and Ti was used to deposit the alloy coatings. A pin-on-disk (POD) test was used to examine the frictional behavior and mechanical stability of the coatings, and was carried out in both low and high humidity conditions. The morphology and microstructure of the coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). The tribological properties of WS2/metal (Ti, W) nanocomposite coatings were investigated using a POD tribometer in ambient air and in humidity conditions. XRD and SEM was used to examine morphology of the wear track after the POD test. The nanoparticles WS2 can decrease the friction coefficient of lubricant obviously. However the results showed that their friction reductions have not obvious difference by the POD tribometer. The WS2/Ti nanocomposite coating showed lower frictions coefficient and higher wear resistance as compared to the pure WS2 coating, which were caused by the microstructure of the composite coating that serve as perfect intermediate lubricants between the contact surfaces. The analyses of surfaces composition coating conducted by XRD and SEM images showed that nanoparticles form a protective film (WO3) allowing an increase the load capacity of friction (rubbed) pairs. The main advantage of the nanoparticles is ascribed to the release and furnishing of the nanoparticles from the valley onto the rubbing metal surface and their confinement at the interface. Coatings of WS2 alone were found to perform well under low-humidity conditions, but poorly under high- humidity. Alloying of WS2 with Ti was found to provide some improvement under high humidity. The patterned film, which consisted of columns of WS2 embedded in a Ti film was found to exhibit friction and wear properties superior to either Ti or WS2 alone. The coating investigated here have potential applications for cutting tools and metal forming dies that will enhance tool life and reduce the energy expended due to friction forces; as well is used in various tribological fields such as seals, bearings or electrical motor brushes and, also for applications needing excellent lubrication and wear-reducing properties

Education 4.0. Between Generation Z and Industry 4.0 needs

The objective of the paper is to briefly find a connections or disconnection between Generation Z needs and wishes and Industry 4.0 needs from its specialists based on Education 4.0 implementations. The method used is secondary qualitative analysis, from information selected from information and hypothesis elaborated by the most known sources in terms of validity and recognition. The findings reveal nine trend that could be added to education principles to develop a just and self-sustaining form for education instead of knowledge. In conclusion we found that the Generation Z has a high expertise of Technology use that can be an advantage for organizations that embrace new technologies. Also, Generation Z needs flexible working hours, a minimum independence and autonomy and an encouraging working environment

Entrepreneurship Trends. How the Future Looks Like

The fast-pacing development of disruptive technologies like Industry 4.0, AI, chat-GPT, etc., state the scene for new entrepreneurial trends. Present paper uses qualitative analysis method to achieve the objective of determining Entrepreneurship Trends. Scrolling through the information reported by different organizations and experts we find thirteen trends that presently influences the entrepreneurs’ behaviors and are a base of how the future of entrepreneurship could look like

The Contribution of Forests from Counties Located in Romania’s West Plain to The Area’s Long Lasting Development

The present paper reunites in an objective synthesis data from forest management plans realized in the West Plain during 1995-2008. The study focused on stands situated around cities and in their construction perimeter in order to emphasise their contribution to the area’s long lasting development. The paper’s importance derives from the fact that urban areas are in a continuous development that will incorporate heavily nearby forests. As such, through their functions, forests contribute to the long lasting development of the entire metropolitan area to which they belong. All forests from the West Plain were divided in stand elements (species of a certain age that belong to a forest’s composition). The study has taken into account all stand elements from the area that belongs to the forest category from around cities. The large number of these stand elements (2107) offers a solid base for the different realized analyses. The paper’s results show that from the entire surface of forests with recreation functions located in the West Plain, 4.670 ha are occupied by Forests from around counties, cities and villages as well as forests located in their construction perimeter. The most widespread species from this type of stand is pedunculate oak (Quercus robur L.), which occupies 2072 ha. Forests from around cities from the West Plain are situated at altitudes between 80 and 400 m. The soils are predominantly common alvisol, while Arum-Pulmonaria is the most widespread flora. In the context of the long lasting development of urban areas with implications on nearby forests, the results and discussions of this article represent a first step towards knowing these forests and towards properly managing them in order to successfully fulfil their protection and recreational purposes

SUSTAINABLE NUCLEAR DEVELOPMENT IN ROMANIA

The paper presents the development of the nuclear power sector in Romania from the perspective of sustainable development. The current state is analysed and the expected future development is investigated. The implementation of ALFRED LFR demonstrator in Romania (reference site: nuclear platform Mioveni) is approached from the point of view of the current stage of RDI and implementation and the contribution to sustainable development in Romania and Europe