In order to ensure a sustainable development, it was necessary to develop technologies for capturing, storing and transforming the energy produced by renewable sources into electricity. In this sense, they have been designed and put into operation a number of facilities for obtaining green energy. Even if, over time these have been optimized to increase the efficiency of electricity production, they had disadvantages in terms of environmental impact. Besides being occupied by large areas of land or represented high accident risks, conventional facilities for generating electricity from renewable energy sources had high costs of production, transport, installation and maintenance. Following the advanced research in the field of energy and environmental protection, a vertically-developed complex installation has been developed, at the laboratory level, that captures and transforms solar radiation, wind power and wave energy into electricity. This has been adapted for coastal areas and it can be the source of electricity in disadvantaged areas. Exploitation of the complex system is continuous, with high efficiency, regardless the weather conditions. At the same time, the vertical development of the complex involves the setting up of some small areas, with an insignificant impact on the aquatic environment.

Biodegradable materials represent a new class of medical materials used for specific applications. These materials tend to replace biomaterials in case of short time implantation situations. Among magnesium and iron based biodegradable alloys a new class, based on zinc, of degradable alloys have many applications because the degradation rate is situated between the rates of Mg and Fe alloys. In this article are presented preliminary results of obtaining a ZnMg alloy through classical melting operation. Also structural (scanning electron microscopy) and chemical (X-ray dispersive energy spectroscopy) analyze results are presented for melted and heat treatment by homogenization states of material.

In this paper is described the present situation in Kosovo concerning the radioactive waste management and namely the waste inventory, classification, interim storage and final disposal considering IAEA documents on this topics. There are more than 100 sealed radioactive sources out of use, including radioactive lightning, other than radioactive waste generated in nuclear medicine departments of hospitals. As result of the necessary information lack for most radioactive sources, were used different methods to identify the type of radionuclide and its activity. Using the IAEA waste classification scheme is carried out the determination of the appropriate methods for safe management of the different group of waste, including its interim storage and final disposal.

A study of the magnetocaloric effect (MCE) of Barium-Strontium-Ferrites BaO•SrO•xFe2O3 and BaO•SrO•xFe3O4 (x=5.6, 5.8, 6) is reported in this article. Using hematite of analytical grade and magnetite from Cox’s Bazar beach sand mineral as ferrite contents, the hexaferrites were synthesized and their magnetic properties and MCE were systematically studied. The results indicate that the samples are strongly ferromagnetic and have high Curie temperature. All the samples are of second-ordered phase and exhibit large magnetic entropy changes. Among all the samples BaO•SrO•5.8Fe2O3 and BaO•SrO•5.8Fe3O4 exhibit the maximum entropy changes at the temperatures near and below the Curie temperature.

In this investigation, detailed microstructural studies were performed to determine their influence on process parameters used in additive manufacturing of AlSi10Mg alloy. As-built specimen orientations and energy densities were the variable process parameters used to evaluate their influence on the resulting microstructures. Microstructures were characterized using a light microscope attached with a software for detailed analysis. Results revealed optimal microstructures for specimens produced with 45.4 J/mm3 global energy density showing cellular-dendritic microstructures. Specimens with global energy density of 37.1 J/mm3 produced an undesirable microstructure with relatively large melt pool boundaries

The aim of this manuscript to study the influence of Bismuth (Bi) addition on the microstructure, melting temperature and undercooling of Sn-0.7Cu solder alloys. In this study, several Bi composition were chosen which is 0 wt.%, 0.25 wt.%, 0.5 wt.%, 1.0 wt.% and 2.0 wt%. The result indicated that with addition of Bi element, it can refine the ß-Sn and reduce the size of primary Cu6Sn5. The melting temperature of Sn-0.7Cu solder alloy was observed by DSC result and found there is no significant changes of melting temperature by Bi additions. However, with Bi addition, it will reduce the undercooling of the Sn-0.7Cu solder alloys