|Aim & Scope||Editorial Board||Call for Paper|| Instruction for Authors|
|Contact Us||Open Access|| Indexing & Archiving|
|Help & Support||Downloads|| Paper Submission|
|S.No.||Article Title & Authors (Volume 11, Issue 4, August - 2018)||Page Nos.||Status|
|1.||Evaluation of Machining Strategies for the Manufacture of Dental Prostheses in Zirconia using the CAD/CAM Technology
Gustavo Freitas, Ivan de Lima e Silva Penz, Fabio Pinto da Silva and Wilson Kindlein Junior
International Journal of Advances in Engineering & Technology (IJAET), Volume 11 Issue 4, pp. 122-128, August 2018.
The continuous use of the CAD/CAM technology in dentistry has offered new possibilities of materials and procedures for the manufacture of dental prosthesis. The present study aimed to evaluate the CNC machining of dental zirconia copings, as well as the surface quality of the workpieces. Two different milling sequences combined with two distinct cutting strategies were analysed. After establishing the best combination of strategy and machining sequence and prioritizing the surface finishing and the machining time of each sample, the tests were performed using varied feed rates. The combined use of the machining sequence, the strategies and the milling parameters had a strong effect on the final finishing and the productivity of the workpieces. The parameters used proved to be effective with the use of 3D offset strategy. The recommended feed rate for roughing and finishing surfaces was 1600 mm/min.
|2.||Optimization of Dual-use System Architecture using Sequential Quadratic Programming Method
Yasuo Otani and Naohiko Kohtake
International Journal of Advances in Engineering & Technology (IJAET), Volume 11 Issue 4, pp. 129-138, August 2018.
For large and complex systems, such as space applications, there exist several cases wherein civilian and defence stakeholders enable interoperability and data sharing with each asset. For this reason, there is concern that both stakeholders are hesitant to architect a dual-use system. This study aimed at optimization by searching for points where a compromise can be reached when developing a civilian and defence dual-use system. Specifically, we modelled the relationship of information sharing between civilian and defence stakeholders, and then performed calculations in the dual-use space situational awareness system by using the sequential quadratic programming (SQP) method. We focused on the relative changes in the risk and profit of each player in the dual-use system. To find a compromise between profit and risk, we formulated an information sharing model by defining appropriate preconditions. Consequently, by defining profit and risk as prerequisites, we were able to converge to a point where both sides reached a compromise. The result of this study provides a quantitative optimal solution that can determine how much information should be provided mutually when constructing a dual-use system. In other words, we established a quantitative validation method to derive a compromise between conflicted profit relationships in a dual-use system.
|3.||The Application of Fe3O4 / Ethylene Glycol as Nanofluid for Cooling Systems in Petroleum Industries
Leqaa Sadeq Jaffar and Tahseen A.AL-Hatab
International Journal of Advances in Engineering & Technology (IJAET), Volume 11 Issue 4, pp. 139-146, August 2018.
The promising technology that used for the improvement thermal performance for heat transfer processes is using nanofluids as a good choice to replace the conventional fluids. The heat exchangers are the wide range application equipment that used for different industrial applications and therefore, the properties and the behavior of the fluid media are the main control parameters in equipment design of the heat exchangers. Natural convection heat transfer of ferrite nanofluid in rectangular cavity has been investigated experimentally in this work. The cavity is subjected at constant wall temperature, the upper side is maintained at cold temperature and lower side is maintained at hot temperature, then it is filled with nanofluid consist of an ethylene glycol (EG) as a base fluid and ferrite a nanoparticles. The flow feature are incompressible, laminar, Newtonian nanofluid at arrange of Rayleigh number between (The volume fraction of nanoparticales in the base fluid considered between (0-0.2). Results showed that increase in Nusselt number with increasing of volume fraction of nanofluid and Rayleigh number. Viscosity(u) and heat transfer enhancement thermal, conductivity(k) increase when the volume fraction of nanoparticles increased.