One of the promising and exciting avenues for developing effective and efficient dielectric materials with high energy density and low cost is the recent approach of introducing inorganic nanoparticles into polymer matrices to form dielectric polymer composites, which finds application in the electrical energy storage, electronic and power device productions.

Identification of radioactive waste is a process first hand regarding the effectiveness and cost management. Radioactive sources and hazardous substances are widely used in agriculture, industry, medicine, and various research fields in our country. Their safe identification and treatment is a current problem for Kosovo, while this problem is given special attention on a global scale. This is in the national interest because in increased risk, degradation of the physical integrity of resources, and loss of control. This scientific paper occupies an important place in modern methods of treatment of this waste

Simulation of welding temperature fields during TIG arc the welding process of Cr-Mo steel bar (ASTM A304) was studied. The results of Simulation models of welding processes help to predict welding parameters effects on the temperature field during and after welding and by this, the failure rate could be estimated and minimized. This paper presents the welding profile model, assembled from 100 mm by 50 mm by 20 mm thick, a Double-Sided Half V-Groove Weld Joint, moving heat source was employed to methodically examine welding temperature fields and transformation in the single-pass butt-welded joint. Unfortunately, the precision of the model rests on many parameters, which cannot be precisely dictated. To resolve this proposition, a calibration process was made by using a Datalogger type K thermocouple – 3 channel–LU-MTM-380SD during the welding process on Cr-Mo steel bar. The obtained Experimental results were used as input to run the simulation. Depending on weld joint profile, temperature fields were discovered to vary with distance from the weld centerline which altered the yield stress of weld metal. To realize this goal, a pattern of the 3D model of heat transfer with a moving heat source during welding was simulated in Autodesk Inventor Simulation CFD 2018 Application Software. The results shown that the welding temperature fields have a higher value at the welding center line and decreased towards the edges of the bar. An indication that simulation is a veritable tool to access likely consequence of the welding process at both welded and non-welded portions of steel bar before real machine structural development.

In this research, the raw material Grevillea robusta is used for the production of pulp and paper through ethanol-alkali pulping processes. Grevillea robusta is available in all parts of the southwestern, particularly Jimma, Bonga Ethiopia. The raw material of Grevillea robusta was characterized after pre-treatment. The central composite design, response surface methodology was used for the data analysis, and four independent variables such as temperature, ethanol concentration, active alkali and pulping time were considered for the optimization process. Independent variables were ranged from 120ºC-200ºC, 30 min-230 min, 5 % -25 %, and 15 % - 75 % for a factor such as a temperature, pulping time, active alkali, and ethanol concentration during the experiment. In this analysis, four responses (dependent variable) of pulp were also analyzed, such as pulp yield, brightness, whiteness, and kappa number. The pulp and paper produced have been characterized by standard methods. Besides, there were four dependent variables obtained within the range of 34.68%-58.31%, 45.56%-72.49 %, 15.78%-37.18 %, and 11.2-18.9 for pulp yield, brightness, whiteness, and kappa. The dependent variable was significantly affected by all independent variables and its p-value was less than 0.05. The optimized process variable was 159.73ºC, 41.17 %, 16.79 %, and 132.26 minutes for temperature, ethanol concentration, active alkali, and pulping time. Optimized results for pulp yield, brightness, whiteness, and kappa number were 57.79 %, 71.30 %, 28.46 %, and 18.48 respectively. The desirability of the optimized outcomes was 0.8511.

Experience builds and proves the worth of the individual in the field of engineering as a profession. The work centered on the design, fabrication, and testing of electrically operated amusement park train with a remote control unit and electromechanical system. Materials used in the fabrication were sourced locally. The machine design incorporates base frame and bearing/shaft housing as a unit, variable electric motor, 5hp(12rpm), coach, lever arm and remote control switch. The design takes care of the speed of the coach with respect to the speed of variable electric motor. The coach is of rectangular form made with an angular bar which is supported by four tyres at the chassis tilted at an angle. Performance evaluation was carried out on the amusement park train and the results showed that the amusement park train has an efficiency of 67.67%. The amusement park train is a viable design, very strong, and efficient. The machine is cheap to install, operate, and maintain. The maintenance does not require special training and spare parts are cheap to obtain. The amusement park train is simple and can be easily operated by the passenger on the coach.

Farraday’s magnetic balance is the well-known device which allow to obtain Curie temperature. This temperature is crucial parameter for describing properties of soft magnetic alloys and allow to show their potential field of application. In this research main scope is on Fe-based amorphous material. In this group is still potential in improvement of their properties, e.g. manufacturability, lowering coercivity, decreasing cost of production in context of application in power generation and conversion as well as electronic. This work includes not only research done on magnetic balance, but also ones conducted on x-ray diffractometry. Alloy was produced by arc melting and injection under protective atmosphere of argon. Results are promising and are presented and discussed in this paper.