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Newsletter 42 Issue 2 - Summer 2010 - Nuts And Bolts, Tractor Museum 2010 University of Nebraska-Lincoln

Newsletter 42 Issue 2 - Summer 2010 - Nuts And Bolts, Tractor Museum

Friends of the Larsen Tractor Museum

No abstract provided.


Measurement, Simulation, And Analysis Of The Mechanical Response Of Railroad Track, Curt J. Greisen 2010 University of Nebraska at Lincoln

Measurement, Simulation, And Analysis Of The Mechanical Response Of Railroad Track, Curt J. Greisen

Mechanical (and Materials) Engineering -- Dissertations, Theses, and Student Research

Increased railroad traffic volumes, speeds, and axle loads have created a need to better measure track quality. Previous research has indicated that the vertical track deflection provides a meaningful indicator of track integrity. The measured deflection can be related to the bending stresses in the rail as well as characterize the mechanical response of the track.

This investigation summarizes the simulation, analysis and development of a measurement system at the University of Nebraska (UNL) to measure vertical track deflection in real-time from a car moving at revenue speeds. The UNL system operates continuously over long distances and in revenue service ...


Material Modeling And Analysis For The Development Of A Realistic Blast Headform, S. G. M. Hossain 2010 University of Nebraska at Lincoln

Material Modeling And Analysis For The Development Of A Realistic Blast Headform, S. G. M. Hossain

Mechanical (and Materials) Engineering -- Dissertations, Theses, and Student Research

Blast traumatic brain injury (BTBI) has become an important topic of study because of the increase of such incidents, especially due to the recent growth of improvised explosive devices (IEDs). This thesis discusses a project in which laboratory testing of BTBI was made possible by performing blast loading on experimental models simulating the human head. Three versions of experimental models were prepared – one having a simple geometry and the other two having geometry similar to a human head. For developing the head models, three important parts of the head were considered for material modeling and analysis – the skin, skull and ...


Bottom Flange Reinforcement In Nu I-Grinders, George Morcous, Kromel E. Hanna, Maher K. Tadros 2010 University of Nebraska-Lincoln

Bottom Flange Reinforcement In Nu I-Grinders, George Morcous, Kromel E. Hanna, Maher K. Tadros

Nebraska Department of Transportation Research Reports

No abstract provided.


Development Of A Low Cost, Energy-Absorbing Bridge Rail, Dean L. Sicking, Robert W. Bielenberg, Ronald K. Faller, Karla A. Lechtenberg, Scott K. Rosenbaugh, John D. Reid 2010 University of Nebraska - Lincoln

Development Of A Low Cost, Energy-Absorbing Bridge Rail, Dean L. Sicking, Robert W. Bielenberg, Ronald K. Faller, Karla A. Lechtenberg, Scott K. Rosenbaugh, John D. Reid

Nebraska Department of Transportation Research Reports

No abstract provided.


Development Of Advanced Finite Element Material Models For Cable Barrier Wire Rope, John D. Reid, Karla A. Lechtenberg, Cody S. Stolle 2010 University of Nebraska - Lincoln

Development Of Advanced Finite Element Material Models For Cable Barrier Wire Rope, John D. Reid, Karla A. Lechtenberg, Cody S. Stolle

Nebraska Department of Transportation Research Reports

No abstract provided.


Metallurgy In The Roman Forts Of Scotland: An Archaeological Analysis, Scott S. Stetkiewicz 2010 Rhode Island College

Metallurgy In The Roman Forts Of Scotland: An Archaeological Analysis, Scott S. Stetkiewicz

Honors Projects Overview

Investigates the presence of metalworking in thirty-seven Roman forts in Scotland during the Flavian, Antonine, and Severan occupations largely through analysis of published documentation concerning relevant archaeological excavations.


Modular Electronic Load, Jason March 2010 California Polytechnic State University - San Luis Obispo

Modular Electronic Load, Jason March

Electrical Engineering

This project entails the design and development of a modular electronic load. The cost and simplicity of the design are considered such that it can be reproduced in-house to replace whenever possible resistor box for load testing of any analog circuits but more specifically power electronic circuits.

The design process as well as the hardware development is explained in details in this report. Results from hardware testing are also provided.


Immunohistochemical Mapping Of Hypoxia In Ischemic Mouse Hindlimb Skeletal Muscle, Emily Deckert 2010 California Polytechnic State University - San Luis Obispo

Immunohistochemical Mapping Of Hypoxia In Ischemic Mouse Hindlimb Skeletal Muscle, Emily Deckert

Biomedical Eng/General Eng.

The study of blood vessel growth and remodeling is a complex endeavor. Hypoxia, the lack of oxygen in a tissue, is known to stimulate angiogenesis (the growth of new blood vessels), and have little effect on arteriogenesis (the enlargement of existing blood vessels). However, the role of hypoxia in vessel function is unknown, but may be determined using the results and methods developed in this experiment.

Supplied by the bloodstream, oxygen is required by all cells and tissues to remain healthy. If the bloodstream supplying a certain tissue with blood is disrupted, the tissue becomes ischemic, often leading to hypoxia ...


Integrating Recommender Information In Social Ecosystems Decisions, Renato A C Capuruco, Luiz Fernando Capretz 2010 Western University

Integrating Recommender Information In Social Ecosystems Decisions, Renato A C Capuruco, Luiz Fernando Capretz

Electrical and Computer Engineering Publications

The exploration of online social networks whose members share mutual recommendations and interactions is a time-dependent and contextual-based process which aims to predict the social status among members, ultimately improving the network's discoverability to achieve societal gain. To address the difficulties associated with the process, this article presents an integrated recommender model whose statements are time-dependent, interaction-aware, and social context-sensitive. The originality of the proposed model stems from the integration of the predictive recommender, social networks, and interaction components. Each model is developed based on: (1) a time history and decay algorithm to consider the decreasing intensity of recommendations ...


Synthesis Of Higher-Order K-Delta-1-Sigma Modulators For Wideband Adcs, Vishal Saxena, R. Jacob Baker 2010 Boise State University

Synthesis Of Higher-Order K-Delta-1-Sigma Modulators For Wideband Adcs, Vishal Saxena, R. Jacob Baker

Electrical and Computer Engineering Faculty Publications and Presentations

As CMOS technology shrinks, the transistor speed increases enabling higher speed communications and more complex systems. These benefits come at the cost of decreasing inherent device gain, increased transistor leakage currents and device mismatches due to process variations. All of these drawbacks affect the design of high-resolution analog-to-digital converters (ADCs) in nano-CMOS processes. To move towards an ADC topology useful in nano-CMOS, the K-Delta-1-Sigma (KD1S) modulator-based ADC was proposed. This paper extends the KD1S to higher order topologies using a systematic synthesis procedure. Second and third order KD1S modulator are designed and simulated to demonstrate the synthesis method.


Indirect Compensation Techniques For Three-Stage Fully-Differential Op-Amps, Vishal Saxena, R. Jacob Baker 2010 Boise State University

Indirect Compensation Techniques For Three-Stage Fully-Differential Op-Amps, Vishal Saxena, R. Jacob Baker

Electrical and Computer Engineering Faculty Publications and Presentations

As CMOS technology continues to evolve, the
supply voltages are decreasing while at the same time the transistor threshold voltages are remaining relatively constant. Making matters worse, the inherent gain available from the nano-CMOS transistors is dropping. Traditional techniques for achieving high-gain by cascoding become less useful in nano-scale CMOS processes. Horizontal cascading (multi-stage) must be used in order to realize high-gain op-amps in low supply voltage processes. This paper discusses indirect compensation techniques for op-amps using split-length devices. A reversed-nested indirect compensated (RNIC) topology, employing double pole-zero cancellation, is illustrated for the design of three-stage op-amps. The RNIC topology ...


An Empirical Study On The Procedure To Derive Software Quality Estimation Models, Jie Xu, Danny Ho, Luiz Fernando Capretz 2010 Western University

An Empirical Study On The Procedure To Derive Software Quality Estimation Models, Jie Xu, Danny Ho, Luiz Fernando Capretz

Electrical and Computer Engineering Publications

Software quality assurance has been a heated topic for several decades. If factors that influence software quality can be identified, they may provide more insight for better software development management. More precise quality assurance can be achieved by employing resources according to accurate quality estimation at the early stages of a project. In this paper, a general procedure is proposed to derive software quality estimation models and various techniques are presented to accomplish the tasks in respective steps. Several statistical techniques together with machine learning method are utilized to verify the effectiveness of software metrics. Moreover, a neuro-fuzzy approach is ...


An Empirical Study On The Procedure To Derive Software Quality Estimation Models, Jie Xu, Danny Ho, Luiz Fernando Capretz 2010 Athos Origin China

An Empirical Study On The Procedure To Derive Software Quality Estimation Models, Jie Xu, Danny Ho, Luiz Fernando Capretz

Electrical and Computer Engineering Publications

No abstract provided.


Design And Implementation Of Signal Processing Circuitry For Implantable Sensors, Anusha Atla 2010 University of Tennessee, Knoxville

Design And Implementation Of Signal Processing Circuitry For Implantable Sensors, Anusha Atla

Masters Theses

Recent technological advancements in integrated circuits and medical technology have made real-time monitoring of physiological factors possible. One such important physiological factor to be measured is glucose. Continuous monitoring of glucose is extremely important for patients with diabetes as it helps make optimal treatment decisions. To enable continuous measurement, a chip containing the sensors and the electronic circuitry is implanted in the human body. This implanted chip provides for continuous measurement and helps reduce inconvenience caused to diabetic patients. A potentiostat forms an integral part of a sensor signal processing circuit. In this thesis the design and simulation of an ...


Behavior Of Precast Bridge Deck Joints With Small Bend Diameter U-Bars, Cheryl Elizabeth Chapman 2010 University of Tennessee - Knoxville

Behavior Of Precast Bridge Deck Joints With Small Bend Diameter U-Bars, Cheryl Elizabeth Chapman

Masters Theses

The Interstate Highway System plays a vital role in our economic development by providing a continuous corridor for transporting goods and services. Currently, there is a need for repair and expansion of the existing highways, which include all bridges along its path. Because of the high demand for the highway system, repair and expansion must occur rapidly and efficiently. In recent years, precast bridge deck systems have become an efficient way to reduce construction time during repair.

This thesis presents the experimental research of the behavior of the U-Bar joint detail used in precast bridge deck systems. This detail consists ...


Synthesis And Scintillation Of Single Crystal And Polycrystalline Rare-Earth-Activated Lutetium Aluminum Garnet, Paul A Cutler 2010 University of Tennessee, Knoxville

Synthesis And Scintillation Of Single Crystal And Polycrystalline Rare-Earth-Activated Lutetium Aluminum Garnet, Paul A Cutler

Masters Theses

Single crystals with composition Lu3Al5O12 were synthesized using Czochralski and micro-pulling-down melt growth techniques. Polycrystalline ceramics of the same composition were synthesized by vacuum annealing of powders prereacted using a citrate-nitrate combustion technique and by spark-plasma-sintering of powders prereacted using a flame-spray-pyrolysis technique. Single crystals and polycrystalline ceramics are activated with Ce3+ or Pr3+ or doubly activated with Ce3+ and Tb3+ ions. Cerium-doped Czochralski-grown single crystals were compared to cerium-terbium codoped Czochralski-grown and micro-pulling down single crystals. Cerium-terbium codoped single crystals are also compared to similarly-activated polycrystalline ceramics sintered under vacuum using combustion-synthesized prereacted powders. X-ray diffraction analysis and fluorescence ...


Energy Harvesting And Mission Effectiveness For Small Unmanned Air Vehicles, Mark J. Cutler, Timothy W. McLain, Randal W. Beard, Brian Capozzi 2010 Brigham Young University - Provo

Energy Harvesting And Mission Effectiveness For Small Unmanned Air Vehicles, Mark J. Cutler, Timothy W. Mclain, Randal W. Beard, Brian Capozzi

All Faculty Publications

This paper explores the feasibility of improving unmanned air vehicle (UAV) mission effectiveness by extracting energy from the atmosphere. Specifically, we consider an aerial surveillance mission in the vicinity of a geographic ridge. Cross winds owing over the ridge produce regions of lift on the windward side that can be exploited to increase mission duration. Mission effectiveness is quantified using the seeability metric. Simulation results are presented for several observation target placements. Results indicate that seeability and imaging persistence can be improved by exploiting ridge lift. Simulations demonstrated that targets at ranges less than four times the ridge height were ...


From Initial To Late Stages Of Epitaxial Thin Film Growth: Stm Analysis And Atomistic Or Coarsegrained Modeling, James W. Evans, Yong Han, Barış Ünal, Maozhi Li, K. J. Caspersen, Dapeng Jing, Anthony R. Layson, C. R. Stoldt, T. Duguet, Patricia A. Thiel 2010 Iowa State University

From Initial To Late Stages Of Epitaxial Thin Film Growth: Stm Analysis And Atomistic Or Coarsegrained Modeling, James W. Evans, Yong Han, Barış Ünal, Maozhi Li, K. J. Caspersen, Dapeng Jing, Anthony R. Layson, C. R. Stoldt, T. Duguet, Patricia A. Thiel

Chemistry Conference Papers, Posters and Presentations

Epitaxial thin film growth by vapor deposition or molecular beam epitaxy under ultra‐high vacuum conditions generally occurs in two stages: (i) nucleation and growth of well‐separated islands on the substrate; (ii) subsequent formation of a thicker continuous film with possible kinetic roughening. For homoepitaxial growth, two‐dimensional (2D) monolayer islands are formed during submonolayer deposition. Typically, the presence of a step‐edge barrier inhibits downward transport and leads to the formation of mounds (multilayer stacks of 2D islands) during multilayer growth. For heteroepitaxial growth, islands formed in the initial stages of deposition sometimes have a 2D monolayer structure ...


Ultrasonic Attenuation Estimation Of The Pregnant Cervix: A Preliminary Report, Barbara L. McFarlin, Timothy A. Bigelow, Y. Laybed, William D. O'Brien Jr., Michael L. Oelze, J. S. Abramowicz 2010 University of Illinois at Chicago

Ultrasonic Attenuation Estimation Of The Pregnant Cervix: A Preliminary Report, Barbara L. Mcfarlin, Timothy A. Bigelow, Y. Laybed, William D. O'Brien Jr., Michael L. Oelze, J. S. Abramowicz

Electrical and Computer Engineering Publications

Estimates of ultrasonic attenuation (the loss of energy as an ultrasonic wave propagates through tissue) have been used to evaluate the structure and function of tissues in health and disease. The purpose of this research was to develop a method to estimate ultrasonic cervical attenuation during human pregnancy using a clinical ultrasound system. Forty women underwent a cervical scan once during pregnancy with the Zonare® z.one clinical ultrasound system using a 4–9-MHz endovaginal transducer. This ultrasound system provides access to radiofrequency (RF) image data for processing and analysis. In addition, a scan of a tissue-mimicking phantom with a ...


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