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21. Wavy channel thin film transistor architecture for area efficient, high performance and low power displays.

Author

Hanna, Amir N., Torres Sevilla, Galo A., Ghoneim, Mohamed T., Hussain, Aftab M., Bahabry, Rabab R., Syed, Ahad, and Hussain, Muhammad M.

Subjects
*THIN film transistors, *ATOMIC layer deposition, *ZINC oxide, *ORGANIC light emitting diodes, *AMORPHOUS semiconductors, *METAL oxide semiconductors
Abstract

We demonstrate a new thin film transistor (TFT) architecture that allows expansion of the device width using continuous fin features - termed as wavy channel (WC) architecture. This architecture allows expansion of transistor width in a direction perpendicular to the substrate, thus not consuming extra chip area, achieving area efficiency. The devices have shown for a 13% increase in the device width resulting in a maximum 2.5× increase in 'ON' current value of the WCTFT, when compared to planar devices consuming the same chip area, while using atomic layer deposition based zinc oxide (ZnO) as the channel material. The WCTFT devices also maintain similar 'OFF' current value, ∼100 pA, when compared to planar devices, thus not compromising on power consumption for performance which usually happens with larger width devices. This work offers an interesting opportunity to use WCTFTs as backplane circuitry for large-area high-resolution display applications. (© 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [ABSTRACT FROM AUTHOR]

Published
2014
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22. Laboratory Evaluation of Concrete Ties and Fastenings for Transit Use

Author

John A. Volpe National Transportation Systems Center (U.S.), United States. Urban Mass Transportation Administration, Hanna, Amir N., Portland Cement Association, John A. Volpe National Transportation Systems Center (U.S.), United States. Urban Mass Transportation Administration, Hanna, Amir N., and Portland Cement Association

Abstract

DOT-TSC-1442, This report was prepared as part of an ongoing research effort by the Urban Mass Transportation Administration (UMTA) to develop standard concrete ties for rapid transit use. The report describes laboratory methods for tie fabrication and presents results of tests on ties and fastenings. As a result of the laboratory testing program, preliminary specifications prepared under an earlier contract were modified and presented in a separate report.

23. Technical and Economic Feasibility Study of At-Grade Concrete Slab Track for Urban Rail Transit Systems

Author

United States. Urban Mass Transportation Administration, John A. Volpe National Transportation Systems Center (U.S.), Hanna, Amir N., Portland Cement Association, United States. Urban Mass Transportation Administration, John A. Volpe National Transportation Systems Center (U.S.), Hanna, Amir N., and Portland Cement Association

Abstract

DOT-TSC-1765, The report presents work conducted to evaluate the technical and economic feasibility of using concrete slab track systems for at-grade transit track. The functions of a rail transit track system are to guide railway vehicles and provide a safe and acceptable ride to passengers. Traditionally, a track system with cross ties and ballast has been used for at-grade construction. Such track systems utilize wood, monoblock concrete, or two-block concrete ties. These track systems undergo permanent deformation during loading due principally to consolidation and degradation of ballast that occurs during track life. Therefore, maintenance operations are required periodically to provide proper surface and alignment. Improved track systems with superior capabilities to those of conventional track provide possible solutions to problems of continuing and costly track maintenance. A slab track system consisting of a continuous concrete support, sub-base, and compacted subgrade, is one example of such improved track system. Rails are secured to the concrete support using fasteners that provide restraint to rail movements and therefore, ensure proper gage and alignment. Experience with concrete slab track systems in foreign countries has shown that such track systems result in decreased maintenance and increased reliability of service. This experience has also indicated a generally higher initial cost of slab track. This report presents a world-wide review of details and performance of slab track projects and compares features of slab track systems with those of conventional ballasted track. Methods of constructing slab track systems and a cost comparison between slab and ballasted track systems are discussed. Recommendations for future research efforts related to the development of at-grade concrete slab track systems are also presented.

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