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Augusta, GA, United States

Sichuga D.,Augusta Technical College | Bellaiche L.,University of Arkansas
Physical Review Letters | Year: 2011

The temperature-versus-misfit-strain phase diagram of Pb(Zr,Ti)O 3 ultrathin films under open-circuit electrical boundary conditions is simulated via the use of an effective Hamiltonian. Two novel phases, both exhibiting dipolar nanodomains and oxygen octahedral tilting, are discovered. The interplay between dipolar, antiferrodistortive, alloying, and strain degrees of freedom induces several striking features in these two phases, such as the chemical pinning of domain walls, the enhancement of oxygen octahedral tilting near the domain walls, and the existence of dipolar waves and cylindrical dipolar chiral bubbles. © 2011 American Physical Society.

Kendoush A.A.,Augusta Technical College
Journal of Heat Transfer | Year: 2013

A mathematical method is described for the analytical solution of the convective heat transfer rates from a rotating isothermal and porous disk in a uniform flow field. By applying the appropriate velocity component of the fluid in the energy equation, a similarity solution was derived showing an increase in the rates of heat transfer with increasing rotational Reynolds number and with decreasing flow Reynolds number. Effects of natural convection and viscous dissipation were assumed negligible. Copyright © 2013 by ASME.

Sichuga D.,Augusta Technical College | Bellaiche L.,University of Arkansas
Journal of Physics Condensed Matter | Year: 2014

Pb(Zr,Ti)O3 ultrathin films under open-circuit electrical boundary conditions and subjected to an electric field rotating in the () plane are investigated via the use of an effective Hamiltonian, for different magnitudes of this field. Varying the direction and magnitude of the electric field leads to specific reorganization of dipoles into original configuration states, whose microstructures and macroscopic properties are revealed. In particular, a novel (direction of the electric field - versus - magnitude of the electric field) phase diagram is reported here. The field-induced correlation between the polar distortions and the oxygen octahedral tilting is also discussed. © 2014 IOP Publishing Ltd.

Agency: NSF | Branch: Standard Grant | Program: | Phase: ADVANCED TECH EDUCATION PROG | Award Amount: 198.87K | Year: 2016

In the world of today, business and industry are increasingly using computer applications and simulations to analyze industrial processes and components that improve process efficiency and safety and reduce operating cost. This Virtual Industrial Process Simulator Lab project at Augusta Technical College in Georgia is designed to enhance the education and instruction of engineering technology students utilizing 3D Virtual Simulation so that graduates of the programs can perform technical functions and assume greater responsibilities immediately upon hire. Utilizing this emerging technology to model industrial processes in a virtual instructional environment is unique to technical education. Students will thus have the technical knowledge and skills to be highly qualified and better prepared engineering technicians for industry and manufacturing as the computer based virtual simulation technology helps students to learn to adapt quickly to industrial process and equipment changes that meet the needs of industry. The inclusion of virtual simulation instruction in the engineering technology programs at Augusta Technical College will attract new students into technical programs and will be utilized in local outreach efforts with high school science, technology, engineering, and mathematics (STEM) programs to increase enrollment. The college has a long history of increasing diversity in engineering technology programs and will continue and expand that impact in this project. A comprehensive evaluation is being developed to research and evaluate the success of the project and its deliverables, as well as the sharing of best practices. Project results will be disseminated widely so that other engineering technology programs around the country can build on these efforts to graduate technicians with the skills required in the jobs of today and tomorrow.

The four objectives of the project are: (1) increasing and deepening the technical knowledge and skill level of engineering technology students through 3D Virtual Simulation instructional methods; (2) developing curriculum to utilize 3D simulations effectively; (3) providing professional development for engineering technology faculty so that they can incorporate Virtual Simulation into their courses; and (4) increasing the number of graduates who are better prepared for technical responsibilities and functioning as engineering technicians in industry. The project will be incorporated into the Mechanical Engineering Technology and Electrical and Computer Engineering Technology programs at the college that are accredited by the Engineering Technology Accreditation Commission of ABET. Through collaborative efforts with industry partners, the engineering technology programs have obtained simulation software, 3D modeling, and technical computer support which has allowed the institution to implement a Virtual Simulation Pilot Lab (VSPL). Although many suppliers have developed 3D virtual simulation equipment models of industrial equipment, no single supplier has synchronized these models into a single Computer Aided Design (CAD) program formatted to replicate industrial processes and their components; so graduates must be familiar with a range of CAD technologies to allow them to function quickly and adapt as needed. The project will also provide comprehensive faculty professional development to prepare faculty to use instructional methods not found in other associate degree curriculums. Collaborative efforts with local industries and software suppliers will result in long term technical support, faculty training, and the provision for the latest technical advancements in software to facilitate the means to bring 3D modeling and simulation to the classroom. The college is one of only four colleges in Georgia to be a part of the NSF Science Technology Engineering and Mathematics (STEM) Equity Pipeline Project to increase diversity in the STEM workforce and has also been supported through Predominately Black Institutions (PBI) Program at the Department of Education to improve the educational outcomes of African American male students. This project builds on those initiatives to increase advanced STEM opportunities for a diverse group of graduates for technical positions.

Sichuga D.,Augusta Technical College | Bellaiche L.,University of Arkansas
Physical Review B - Condensed Matter and Materials Physics | Year: 2012

The multidomain structure evolution in Pb(Zr,Ti)O 3 ultrathin films subject to an electric field applied along the pseudocubic [111] direction is investigated via the use of an effective Hamiltonian. Varying the magnitude of this electric field (that possesses both in-plane and out-of-plane components) leads to the formation of five different states, whose microstructures and properties are revealed here. Such variation also makes the polarization changing not only in magnitude but also in direction. The field-induced correlation between the polar distortions and the oxygen octahedral tilting is also discussed as an important factor affecting the polarization. © 2012 American Physical Society.

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