USC > CEC > Events for May 2008

Events for May 2008

Friday, May 2

Biomedical Engineering Seminar Series, 2 pm, Faculty Lounge (SWGN)

Speaker:
Prof. Mohamed Sharawy, Director of Anatomy in the Department of Oral Biology and Professor of Oral and Maxillofacial Surgery, Medical College of Georgia

Title:
Bioengineering of Jaw Bone by the use of Polymers, Cells, Local Growth Factors and Dental Implants

Abstract:
The advances in the fields of tissue engineering and molecular biology have made it possible to rehabilitate patients who suffer from loss of large part of their upper or lower jaws due to post extraction atrophy, trauma with avulsion, surgical excision of tumors or cysts and osteomyelitis. To bioengineer a jaw one needs a combination of framework of polymers and /or autogenic or allogenic bone grafts, stem or osteoprogenitor cells, appropriate local growth factors and dental implants. Several experiments will be presented that will demonstrate the feasibility of employing the bioengineering approach to the reconstruction of jaw structure and function. For example: the use of combination of porous blocks of polymer ,demineralized freeze dried bone and dental implants in the reconstruction of atrophied ridges will be presented. The successful use of titanium reinforced membranes and PRP in the regeneration of mandible critical size defects followed by dental implants is another experiment. The use of polymeric micro spheres as a carrier of stem cells and local growth factors will be briefly discussed.

Bio:
Dr. Mohamed Sharawy received his bachelor of Dental Surgery with Honor (B.D.S.) in 1962 and oral surgery training in 1965 from Cairo University, School of Dentistry, Cairo, Egypt. He received his Ph.D. degree in Anatomical Sciences from the School of Medicine and Dentistry, University of Rochester, Rochester, N.Y. in 1970. He is currently Professor and Director of Anatomy in the Department of Oral Biology and Professor of Oral and Maxillofacial Surgery, Department of Oral and Maxillofacial Surgery at the Medical College of Georgia, Augusta, Georgia. Dr. Sharawy is Program Director at the MCG Dental Research Center and is also a Professor of Anatomy at the MCG School of Medicine and School of Graduate Studies. Dr. Sharawy is co-editor and contributor to Orban's textbook of Oral Histology, author of the Companion of Applied Anatomy and contributor to several symposia and books of oral implantology and TMJ. He has published over one hundred and eighty research papers. Dr. Sharawy is currently president of the Anatomical Board, State of Georgia and was recently elected to the Board of Governors, American Academy of Implant Dentistry Research Foundation.

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Monday, May 5

EE Seminar, 10 am, 3D05 (SWGN)

Massood Tabib-Azar, Electrical Eng and Comp Sci Department, Case Western Reserve University

ABSTRACT:
Electronics with integrated energy harvesting devices, sensors and actuators are becoming pervasive embedded systems in monitoring health, conditioning for sports, improving energy efficiency of combustion engines and improving the overall quality of life. In this talk I will discuss three examples from my research in the development and applications of microsystems in prosthesis, in engine efficiency and in sensing. These seemingly disparate applications have many important elements in common such as interfacing with harsh environments (biological as well as industrial), low power requirements, etc. I will also discuss nanotechnologies that offer some unique solutions such as type II photovoltaic cells for energy harvesting and nano-texturing for efficient electrodes-tissue interfacing. A specific example involving impedance-matched electrodes to efficiently transduce extracellular electrical activities will be discussed. These micro-machined electrode arrays on compliant silicon cantilever beams were coated with carbon nanotubes to provide a large interface with bi-lipid membranes and produced signals an order of magnitude better than the un-coated electrodes. The compliant slightly hydrophobic beams interacted with the membranes through van der Waals forces and attached themselves to the bi-lipid membranes producing very large interfacial capacitance resulting in an excellent cell transduction.

ME Seminar, 2 pm, A228 (300 Main)

Dr. Jinju Chen, Newcastle University, Newcastle Upon Tyne, UK, "Assessment of fracture toughness and adhesion of thin coated systems by nanoindentation"

ABSTRACT:
With the development of complex coating stacks (e.g. multilayered coated systems) and the presence of variable crack patterns, the difficulty of generating a solution by stress analysis based models is dramatically increased. Therefore, there is an urgent need for the development of models to deal with complex coatings and varied cracking patterns. The most successful models in this respect are energy-based.

Several energy based models have been developed to assess coating toughness in this work. The first model (Wt-dp method) is based on the analysis of the excursion in the load-displacement (P-δ ) curve which is associated with indentation induced fracture. Compared to a literature model based on extrapolating P-δ curve, this approach removes the influence on fracture dissipated energy from plastic deformation of the substrate. However, it is often observed that fracture may not result in an excursion in the P-δ curve, which requires a different modelling approach. Therefore, an alternative model (Wirr-Wp model) developed to address this problem.

Adhesion failure is another long-existing problem which is a particular concern in coated systems. Here, another energy based method is proposed to estimate the adhesion of coatings.

Selected publications:
1. Assessment of the toughness of thin coatings using nanoindentation under displacement control, J. Chen and S.J. Bull, Thin Solid Films, 494 (2006) 1-7
2. Indentation fracture and toughness assessment for thin optical coatings on glass, J. Chen and S.J. Bull, J. Phys. D: Applied Physics, 40 (2007) 5401-5417
3. Assessment of the adhesion of ceramic coatings, J. Chen and S. J. Bull, Proc CIMTEC 2006, Acireale, June 5-9, 2006, Advances in Science and Technology, 45 (2006) 1299-1308

BIO:
Dr. Jinju Chen obtained her first degree in Central South University and her Ph.D in Materials Engineering in Newcastle University in 2006. Since 2006, she has worked as Research Associate with Prof. S. J. Bull in Newcastle University.

She has presented her work in more than 15 international conferences such as MRS, MS&T, Gordon Conference (GRC). She has more than 16 publications in nanomechanics field. Among which, the following article has been selected as highlights of the year 2007 in J. Phys. D: J. Chen and S J Bull, Indentation fracture and toughness assessment for thin optical coatings on glass, J. Phys. D: Appl. Phys. 40 (18), 5401-5417 (2007).

Everyone is welcome to attend.

Wednesday, May 7

Photos Wanted

Please submit photos of students and faculty at the College - especially graduating students, for presentation during Saturday, May 10th's reception here at the College. E-mail photos to cyndy@engr.sc.edu

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