# Engineering Commons™

## All Articles in Engineering

135,039 full-text articles. Page 3553 of 3785.

Constraint-Related Reinterpretation Of Fundamental Physical Equations Can Serve As A Built-In Regularization, 2010 University of Texas at El Paso

#### Constraint-Related Reinterpretation Of Fundamental Physical Equations Can Serve As A Built-In Regularization, Vladik Kreinovich, Juan Ferret, Martine Ceberio

##### Departmental Technical Reports (CS)

Many traditional physical problems are known to be ill-defined: a tiny change in the initial condition can lead to drastic changes in the resulting solutions. To solve this problem, practitioners regularize these problem, i.e., impose explicit constraints on possible solutions (e.g., constraints on the squares of gradients). Applying the Lagrange multiplier techniques to the corresponding constrained optimization problems is equivalent to adding terms proportional to squares of gradients to the corresponding optimized functionals. It turns out that many optimized functionals of fundamental physics already have such squares-of-gradients terms. We therefore propose to re-interpret these equations -- by claiming that ...

Towards An Efficient Bisection Of Ellipsoids, 2010 University of Texas at El Paso

#### Towards An Efficient Bisection Of Ellipsoids, Paden Portillo, Martine Ceberio, Vladik Kreinovich

##### Departmental Technical Reports (CS)

Constraints are often represented as ellipsoids. One of the main advantages of such constrains is that, in contrast to boxes, over which optimization of even quadratic functions is NP-hard, optimization of a quadratic function over an ellipsoid is feasible. Sometimes, the area described by constrains is too large, so it is reasonable to bisect this area (one or several times) and solve the optimization problem for all the sub-areas. Bisecting a box, we still get a box, but bisecting an ellipsoid, we do not get an ellipsoid. Usually, this problem is solved by enclosing the half-ellipsoid in a larger ellipsoid ...

Modular Electronic Load, 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.

2010 Western Michigan University

#### Pattern Recognition For Fault Detection, Classification, And Localization In Electrical Power Systems, Qais Hashim Alsafasfeh

##### Dissertations

The longer it takes to identify and repair a fault, the more damage may result in the electrical power system, especially in periods of peak loads, which could lead to the collapse of the system, causing the power outage to extend for a longer period and larger parts of the electrical network. Reducing the outage time and immediate restoration of service can be achieved if the fault type and location are determined in a timely and precise manner.

An integrated algorithm that is based on generating unique signatures from the electric current signal to detect, classify, and localize a fault ...

Integration Of Microfluidics With Surface Plasmon Resonance, 2010 California Polytechnic State University - San Luis Obispo

#### Integration Of Microfluidics With Surface Plasmon Resonance, Scott B. Fratzke

##### Master's Theses and Project Reports

This thesis successfully integrates laminate microfluidic devices with an analytic Surface Plasmon Resonance (SPR) instrument. Integration was accomplished at low-cost using materials such as polydimethylsiloxane (PDMS), Poly(methyl methacrylate) (PMMA), Tygon tubing, and a 3-way stopcock. The main components of this thesis are the design and fabrication of the low-cost, in-house fluidics that can integrate with upstream microfluidics and the validation of the in-house fluidics using the Biosensing Instruments BI-2000 SPR instrument. The low-cost fluidics was designed and fabricated “in-house” using a novel investment casting technique that required the use of laser cutting technology to make a master cast, and ...

"Picasso" Interface For Horizon Simulation Framework, 2010 California Polytechnic State University - San Luis Obispo

#### "Picasso" Interface For Horizon Simulation Framework, Brian E. Kirkpatrick

##### Master's Theses and Project Reports

The Horizon Simulation Framework, or HSF, is a modeling and simulation framework compiled from C/C++ source code into a command line program. Picasso is an interface designed to control the input files to Horizon by providing visual tools to create and manipulate the XML files used to define an HSF system of assets, their environment, and other simulation parameters. Picasso also supports the visualization of Horizon output in several different forms, and import mechanics from online space object catalogues.

Improved Compression Of Network Coding Vectors Using Erasure Decoding And List Decoding, 2010 Iowa State University

#### Improved Compression Of Network Coding Vectors Using Erasure Decoding And List Decoding, Shizheng Li, Aditya Ramamoorthy

##### Electrical and Computer Engineering Publications

Practical random network coding based schemes for multicast include a header in each packet that records the transformation between the sources and the terminal. The header introduces an overhead that can be significant in certain scenarios. In previous work, parity check matrices of error control codes along with error decoding were used to reduce this overhead. In this work we propose novel packet formats that allow us to use erasure decoding and list decoding. Both schemes have a smaller overhead compared to the error decoding based scheme, when the number of sources combined in a packet is not too small.

2010 Boise State University

#### Differentially Encoded Quadrature Phase Shift Key Communication And Real-Time Implementation, Robert Walton Conant

##### Boise State University Theses and Dissertations

Robust communication methods are integral to advances in modern technology. Software defined radios (SDRs) have been the chief instruments of communication for the last three decades. Upcoming generations of wireless networks and phone systems depend on successful implementations of increasingly sophisticated software defined modulation methods. The challenges presented by encoding, modulation, signal conditioning, timing, and decision algorithms are non-trivial. Adapting to the impacts of wired and wireless channels adds further complexity.

While not comprehensive on the subject of communications, this text serves to introduce the practical concepts of binary communications, modulation methods, the digital signal processor (DSP), and software defined ...

2010 Boise State University

#### A Reconfigurable Pattern Matching Hardware Implementation Using On-Chip Ram-Based Fsm, Indrawati Gauba

##### Boise State University Theses and Dissertations

The use of synthesizable reconfigurable IP cores has increasingly become a trend in System on Chip (SOC) designs. Such domain-special cores are being used for their flexibility and powerful functionality. The market introduction of multi-featured platform FPGAs equipped with on-chip memory and embedded processor blocks has further extended the possibility of utilizing dynamic reconfiguration to improve overall system adaptability to meet varying product requirements. A dynamically reconfigurable Finite State Machine (FSM) can be implemented using on-chip memory and an embedded processor. Since FSMs are the vital part of sequential hardware designs, the reconfiguration can be achieved in all designs containing ...

2010 Boise State University

#### Hardware Implementation Of Real-Time Operating System’S Thread Context Switch, Deepak Kumar Gauba

##### Boise State University Theses and Dissertations

Increasingly, embedded real-time applications use multi-threading. The benefits of multi-threading include greater throughput, improved responsiveness, and ease of development and maintenance. However, there are costs and pitfalls associated with multi-threading.

In some of hard real-time applications, with very precise timing requirements, multi-threading itself becomes an overhead cost mainly due to scheduling and contextswitching components of the real-time operating system (RTOS). Different scheduling algorithms have been suggested to improve the overall system performance. However, context-switching still consumes much of the processor’s time and becomes a major overhead cost especially for hard real-time embedded systems.

A typical RTOS context switch consumes ...

2010 Clemson University

#### Surface Characterization And Electrochemical Behavior Of Colloidal Particles, Cinta Pepin

##### All Theses

There is an ongoing interest in research focused on developing polymeric organic-light-emitting-devices (OLED) to replace inorganic devices. Compared to inorganic devices, OLEDs could present better properties such as higher efficiency, lower cost and simpler device fabrication. In an attempt to get a device with high efficiency, the hole transporting group and the electron transporting group were combined into a polymer to make an individual 'particle device'. The idea was to create a polymer particle containing both charge transporting moieties via emulsion polymerization. In this presentation, different techniques will be described that were used to determine the stability and the surface ...

Ultrasonic Attenuation Estimation Of The Pregnant Cervix: A Preliminary Report, 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 ...

2010 Clemson University

#### Fabrication Of Fluorescent Nanoparticle-Polymer Composites For Photoactive-Based Materials, Brett Ellerbrock

##### All Theses

Nanocomposites of nanoparticles dispersed throughout a polymer matrix have been studied to great length to improve the overall polymer properties. These enhancements are observed in the thermal, physical, and/or optical characteristics. Being able to harness nanoparticles in such a way may help improve fiber technology into the 21st century.
This work was geared toward synthesizing rare earth doped lanthanum fluoride (LaF3) nanoparticles because good separation in the absorption and emission bands of the material and it fluoresces in the visible to near-infrared range. Terbium ions were added to a LaF3 crystal because of their distinct visible green ...

2010 Clemson University

#### Hemocompatibility And Endothelialization Of Elastin And Collagen Scaffolds: The Role Of Plasma Proteins, Shear Stress And Integrins, Nithya Swaminathan

##### All Theses

Cardiovascular diseases are the leading cause of death worldwide as reported by the World Health Organization. Biomaterials have been extensively used in blood-contacting applications as heart valves, stents, grafts and catheters. However failure due to thrombosis hinders the long term patency and potential of these devices. Purified elastin scaffolds derived from porcine arteries as potential vascular graft materials are being investigated in our laboratory. In this study, we investigated the influence of factors such as shear stress and the presence of plasma proteins on the platelet response, and endothelial cell retention on purified elastin scaffolds to evaluate their hemocompatibility.

Elastin ...

Anaerobic Bio-Oxidation Of Vinyl Chloride And Ethene, 2010 Clemson University

#### Anaerobic Bio-Oxidation Of Vinyl Chloride And Ethene, Anthony Reid

##### All Theses

Tetrachloroethene and trichloroethene are among the most prevalent groundwater contaminants found at hazardous waste sites throughout the United States. Since implementing some of the common treatment methods to remediate these hazardous waste sites would exceed hundreds of billions of dollars, there is considerable interest in reducing costs while achieving remediation regulations. Under anaerobic conditions, these compounds can undergo reduction reactions known as reductive dechlorination. This occurs when an electron donor provides the reducing equivalents needed to replace the chlorine atoms with hydrogen atoms. The daughter products from higher chlorinated ethenes are ethene and ethane which can be used to document ...

2010 Clemson University

#### Automation Of Non-Destructive Testing Techiniques Used For Finding Defects, Bhanu Singh

##### All Theses

This master thesis focuses on the automation and fusion of non-destructive testing methods. The research includes the fusion of non-destructive testing methods done with infrared micro-bolometer and ultrasonic transducers. A control system which utilized mechanical, electrical, electronic systems and computer aided technologies was developed. Conveyor belt system, PLC (programmable logic controller), XYZ mechanism and different sensors were utilized to automate the process of capturing images and a communication link was set up between thermal camera and system that controls the ultrasonic testing apparatus, to integrate the two techniques. The test results from the thermal camera were utilized in ultrasonic testing ...

2010 Clemson University

#### Sensor Based Nitrogen Management For Cotton Production In Coastal Plain Soils, Wesley Porter

##### All Theses

The main objective of this four year study was to develop, refine, and employ sensor-based algorithims to determine the mid season nitrogen requirements for production of irrigated and dryland cotton (Gossypium hirsutum L.) in Coastal Plains soils. The secondary objective of the project was to develop and test equipment for variable rate application of nitrogen to commerical cotton fields utilizing the developed algorithim. Two different production fields at Clemson's Edisto Research and Education Center near Blackville, SC were used. One field, equiped with an overhead irrigation system, was used during the 2007 and 2010 production seasons to develop the ...

2010 Clemson University

#### The Use Of A-Flute, B-Flute, Ac-Flute, And Bc-Flute Corrugated Paperboard As A Cushioning Material, Alicia Campbell

##### All Theses

Corrugated paperboard, often referred to as cardboard by those outside the
industry, is most often associated with the typical shipping box. Research has proven that cushioning is another possible packaging application for corrugated paperboard.
Corrugate is easily accessed, obtained from a renewable resource, and easily recycled all of which appeal to the increased interest in the use of sustainable materials. Most research related to corrugate as a cushioning material has been performed using
single-wall, C-flute corrugated paperboard.
The purpose of this research was to create cushion curves for A-flute, B-flute,
AC-flute, and BC-flute corrugated paperboard using the stress energy method ...

2010 Clemson University

#### Induction Assisted Thermography For Inspection Of Micro Defects On Sheet Metals, Sree Pamidi

##### All Theses

The work focuses on Induction assisted Thermography as a non-contact and non-destructive method of Inspecting micro defects on sheet metals used for making automotive body panels. Induction heating as a source of excitation to elevate the temperatures of sheet metals for uniform heating and detect ability of the defect is the main objective of the study.
Experiments are done on sheet metal samples with defects using excitation techniques like Pulse and Electromagnetic Induction. The thermal images obtained from the infrared camera are used to quantitatively analyze the detect ability of defects on sheet metals. The limitations of using Pulse technique ...

2010 Clemson University

#### Detecting Piecewise Linear Networks Using Reversible Jump Markov Chain Monte Carlo, Akshay Apte

##### All Theses

This work proposes a piecewise linear network model to approximate structures observed in an image. An energy function is used to capture the characteristics of the structure. The energy function consists of two parts: the prior energy term and the data energy term. The prior energy term is calculated using prior information about the structures of interest. The data energy term is calculated using observations made from the image. The energy function is minimized using Reversible Jump Markov Chain Monte Carlo (RJMCMC) to get the approximate centerline of the structure. The algorithm was tested on a database of \$150\$ images ...