In recent years, composite materials such as carbon-fibre-reinforced plastic (CFRP) have been widely used in medical devices, industries, marine and aerospace applications due to their high resistance-to-weight ratio toughness, corrosion resistance, and other novel properties. The machining of these composite materials using conventional machines results in poor precision and surface finishing due to excess heat generation at the tool-material contact zone. The drawbacks of the conventional machining process can be overcome with the adoption of a novel cutting technique using pressurized water, which can dissipate the heat generated by the impact of abrasive particles against the material in order to eliminate the poor precision and surface finishing caused by overheating. In this experimental study, the performance of surface quality (roughness and kerf angle) of CFRP machining using an abrasive water jet technique has been studied for a wide range of cutting parameters, such as water pressure and cutting speed.

This study deals with an integrated solar combined cycle systems (ISCCS) simulation. The ISCCS presents a cogeneration of the Parabolic Trough Solar collector (PTC) system and the Rankine power cycle. The PTC system is employed to ensure stable thermal energy which is required to operate a steam turbine (with three stages), which is designed to produce enough electrical power (medium scale). The performance of the ISCCS is simulated and evaluated by using the TRNSYS software. This system is being considered for installation in Irbid, Jordan, and a comparison study is being conducted to determine the performance of the ISCCSmedium scale during the winter and summer seasons. The results show that the ISCRCS system's efficiency is 14.3% in winter (January 1) and 21.2% in summer (August 1), with 4.48 MW of electrical power produced in winter (January 1) and 4.05 MW produced in summer (August 1).

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One of the most challenging tasks in machining hard materials is to achieve super high precision with excellent surface finish. The reasons can be addressed due to its properties including high work hardening and poor machinability. Abrasive water jet (AWJ) machining is a multi-operational activity which is proven technology for generating high precision components. The carried-out work mainly intended to showcase the technical parameters which are prime importance in commercial and domestic applications. There parameters include water pressure, traverse speed, abrasive feed rate. These parameters were analyzed with respect to kerf taper and surface roughness on X5CrNi18-10 steel. In the present work key parameters such as traverse speed and outlet pressure were varied from 100 -200 mm /min and 100 -200 MPa, respectively. Apart from these two parameters abrasive feed rate was also varied in the range 360 -540 g/min. Our data from experimental procedures indicate that kerf taper and surface roughness were greatly deflect by variations in the three major parameters; traverse speed, water pressure, and abrasive feed rate. To ensure better comparison of work optimization of process parameter was also carried out. In this optimization response surface methodology and central composite design method was enabled. In addition, all the needed mathematical models were enabled and set of desired contour graphs for tested surface quality are systematically represented. Finally, the kerf taper angle behaviors were also carried out using ANOVA analysis powered by MINITAB 19.