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PITTETD 檢索結果共 4141 筆,本頁資料從第 25 筆到第 36 筆

Myoblast transplantation has been investigated as a treatment for Duchenne Muscular Dystrophy and injured myocardial tissue. Multiple groups have isolated an early myogenic precursor population, termed muscle-derived stem cells (MDSCs) that have a superior ability to regenerate dystrophin-positive myofibers and improve cardiac function following an ischemic event as com....

By Kenneth Urish-Bioengineering-University of Pittsburgh-doctoral-2007-01-31
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The detrimental results of whole-body vibration (WBV) and their effect on humans in the seated position have been documented. Although wheelchair users are subjected to WBV little research has been conducted to assess these vibrations or attempt to reduce them. Sixteen able bodied subjects tested two powered wheelchairs: a Quickie S-626 and an Invacare 3G Torque SP. Ea....

By Erik Jason Wolf-Bioengineering-University of Pittsburgh-doctoral-2007-01-31
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This thesis concentrates on the reduction of field (both main field B0 and RF field B1) inhomogeneity in MRI, especially at high B0 field. B0 and B1 field inhomogeneity are major hindrances in high B0 field MRI applications. B1 inhomogeneity will lead to spatially varying signal intensity in the MR images. B0 inhomogeneity produces blurring, distortion and signal loss a....

By Zhenghui Zhang-Bioengineering-University of Pittsburgh-doctoral-2007-01-31
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Dense metal membranes have been identified as a promising technology for post-gasifier forward water-gas shift membrane reactors. Unfortunately, the impurities present in the gasifier effluent streams, such as H2S, can have adverse effects on the mechanical and chemical stability of potential metal membranes in the form of corrosion or catalyst deactivation, respectivel....

By Bryan David Morreale-Chemical Engineering-University of Pittsburgh-doctoral-2007-01-31
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DEVELOPMENT OF A PARACORPOREAL RESPIRATORY ASSIST LUNG Robert G. Svitek, PhD University of Pittsburgh, 2006 A Paracorporeal Respiratory Assist Lung (PRAL) was developed for supplemental gas exchange to allow the native lungs of acute lung failure patients time to heal. The device consisted of a rotating annular microporous hollow fiber membrane bundle. The rotation augm....

By Robert G. Svitek-Chemical Engineering-University of Pittsburgh-doctoral-2007-01-31
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CO2 is known to be an environmentally benign solvent. However, its feeble solvent power inhibits its wide use in industrial applications. The ultimate goal of this research is to design and optimize polymers that are highly soluble in CO2. Molecular modeling methods have been used to analyze the results from experiments and make predictions. We have employed ab initio q....

By Yang Wang-Chemical Engineering-University of Pittsburgh-doctoral-2007-01-31
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Collections of several hundred, thousands, or even millions of small devices scattered or placed throughout an area monitoring the environment called sensor networks have several useful applications. Until recently, the economic cost of development, manufacture, and deployment limited the use of sensor networks to military and government applications. Recent advances in....

By Peter Joseph Hawrylak-Electrical Engineering-University of Pittsburgh-doctoral-2007-01-31
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As the need to support high speed data exchange in modern communication networks grows rapidly, effective and fair sharing of the network resources becomes very important. Todays communication networks typically involve a large number of users that share the same network resources but may have different, and often competing, objectives. Advanced network protocols that a....

By Ismet Sahin-Electrical Engineering-University of Pittsburgh-doctoral-2007-01-31
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Cyber intrusions have become a serious problem with growing frequency and complexity. Current Intrusion Detection/Prevention Systems (IDS/IPS) are deficient in speed and/or accuracy. Expert systems are one functionally effective IDS/IPS method. However, they are in general computationally intensive and too slow for real time requirements. This poor performance prohibits....

By Ying Yu-Electrical Engineering-University of Pittsburgh-doctoral-2007-01-31
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Since 1990 many countries have started a deregulation process in the electricity wholesale market with a view to gaining in efficiency, lowering prices and encouraging investments. In most of the markets these objectives have been accomplished, but at the same time, prices have shown high volatility. This is mainly due to certain unique characteristics of electricity as....

By Claudio Ruibal-Industrial Engineering-University of Pittsburgh-doctoral-2007-01-31
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A yield strength anomaly has been observed in intermetallic L10-ordered FePd alloys between about 300-700K. However, previous work did not provide clear explanations regarding the microstructural or mechanistic origins for this observation. FePd and ×-TiAl have the same crystal sturtucre. YSA was studied intensively in ×-TiAl system and its origin was related for the....

By Amal Abdulla Al Ghaferi-Materials Science and Engineering-University of Pittsburgh-doctoral-2007-01-31
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Pneumatic transport of solids is widely used due to many of its advantages. Many studies have been carried out to explore the details of the transport of solids with pneumatic conveying with the aim to develop enhanced operations. The flow pattern seen in pneumatic conveying can vary widely depending on the gas velocity, the solid feed rate and the characteristics of th....

By Jae Bum Pahk-Mechanical Engineering-University of Pittsburgh-doctoral-2007-01-31
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