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PITTETD 檢索結果共 4141 筆,本頁資料從第 13 筆到第 24 筆

Chronic recordings from micromachined neural electrode arrays often fail a few weeks after implantation primarily due to the formation of an astro-glial sheath around the implant. We propose a drug delivery system, from conducting polymer (CP) coatings on the electrode sites, to modulate the inflammatory implant-host tissue reaction. In this study, polypyrrole (PPy) bas....

By Reecha Wadhwa-Bioengineering-University of Pittsburgh-masters-2007-01-31
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Although in its infancy, leveraging high strength fiber reinforced polymer (FRP) materials for retrofit of steel structures has been the focus of recent investigations. Studies include the application of FRP to steel for flexural and fatigue or fracture retrofit as well as improving steel member stability. The research presented in this thesis attempts to introduce the ....

By Elizabeth Jean Abraham-Civil and Environmental Engineering-University of Pittsburgh-masters-2007-01-31
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Water supplies in many regions of the world are contaminated by the carcinogenic metalloid arsenic (As). Though the U.S. Environmental Protection Agency (EPA) recently reduced the Maximum Contaminant Level (MCL) from 50 Ýg/L to 10 Ýg/L, water in some developing countries are far from this standard. Therefore, highly efficient, sustainable technologies that require low....

By Chantal Blake-Civil and Environmental Engineering-University of Pittsburgh-masters-2007-01-31
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An experimental study of two commercially available offset mechanical reinforcement bar splice systems is presented. The two splice systems, the BarSplice Double Barrel Zap Screwlok© and the Lenton QuickWedge©, were evaluated in four series of tests with reinforcement bar sizes ranging from #4 to #6. The tests were as follows: Direct Tension which tested the splice in....

By Keith Lynn Coogler-Civil and Environmental Engineering-University of Pittsburgh-masters-2007-01-31
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Four 10 (254 mm) deep, 6 (152 mm) wide and 186 (4730 mm) long concrete beams having three #4 longitudinal steel reinforcing bars as primary flexural reinforcement, were retrofitted with steel fiber-reinforced polymer (SFRP). A commercially available 4.75 in. (121 mm) wide, 0.048 in. (1.2 mm) thick unidirectional steel fiber reinforced strip system was used along with a ....

By Patrick Lucien Minnaugh-Civil and Environmental Engineering-University of Pittsburgh-masters-2007-01-31
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The use of liquid hydrogen as a fuel in both ground and in space requires low-cost multi-point sensing of hydrogen gas for leak detection well below the 4% explosion limit of hydrogen. In this thesis, we demonstrate an agile multi-functional active fiber optical hydrogen sensor for all temperature operations. Fiber-optical hydrogen sensors offer a number of advantages o....

By Matrika Bhattarai-Electrical Engineering-University of Pittsburgh-masters-2007-01-31
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As silicon CMOS circuit technology is scaled above the GHz range, semiconductor industries face increasingly difficult challenges in implementing high speed metal interconnects. Metal trances are limited in density-speed performance due to the skin effect, electrical conductivity, and cross talk. Optical based interconnects have much higher available bandwidth by virtue....

By Zhuo Chen-Electrical Engineering-University of Pittsburgh-masters-2007-01-31
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ZrO2-3mol%Y2O3 powders were pressed uniaxially using loads of 51 MPa and isothermal sintered at 1275OC. Measurements of the pore size, grain size and pore distribution indicated that contrary to the assumption of the phenomenological models of sintering, pore elimination was involved in densification and coarsening during the intermediate stage sintering. SEM imaging sh....

By Tiandan Chen-Materials Science and Engineering-University of Pittsburgh-masters-2007-01-31
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This thesis presents a new determination of $Lambda_{QCD}$ from Next-to-Leading Order QCD fits to the $Q^2$ dependence of neutrino-iron structure functions. This is the first measurement of $Lambda_{QCD}$ which uses a theoretical model that fully accounts for heavy quark production. Compared with previous neutrino measurements, the result has improved understanding of t....

By Voica A. Radescu-Physics-University of Pittsburgh-doctoral-2007-01-31
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The conformal algebra of an n-dimensional affine space with a metric of arbitrary signature (p, q) with p + q = n is considered. The case of broken conformal invariance is studied, by considering the subalgebra of the enveloping algebra of the conformal algebra that commutes with the squared-mass operator. This algebra, denoted R, is generated by the generators of the P....

By Daniela Mihai-Mathematics-University of Pittsburgh-doctoral-2007-01-31
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In cases of craniosynostosis, defined as the premature fusion of the cranial sutures, there is a need to inhibit bone formation in small calvarial defects to avoid the occurrence of postoperative resynostosis. Similarly, reconstruction of bone in the craniofacial skeleton following injury or tumor resection necessitates controlled bone regeneration to avoid bone overgro....

By Gregory M. Cooper-Bioengineering-University of Pittsburgh-doctoral-2007-01-31
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Scaffolds composed of extracellular matrix (ECM) and derived from various species and various organs have been shown to promote constructive, site-specific tissue remodeling in pre-clinical studies and clinical use, including musculoskeletal, urogenital, dermal, cardiovascular, and neural applications. Despite extensive study, the mechanisms of the remodeling process ar....

By Thomas Wayne Gilbert-Bioengineering-University of Pittsburgh-doctoral-2007-01-31
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