Engineering Commons^™

Optical Ring Resonator And Other Photonic Devices (May 2008), Eric F. Wong

Journal of the Microelectronic Engineering Conference

This project aimed to design, simulate, fabricate and test optical ring resonators and other wave guide devices. The computational technique used to simulate our devices was beam propagation method (BPM) in RSOFT CAD software. These devices were developed to be fabricated on 4” silicon-oninsulator (SOl) wafers and fabricated in toe Rochester Institute of Technology fabrications laboratory.

Unbalanced Mach-Zehnder Electro-Optic Modulator And Waveguide Components, Konstantin Yurchenko

Journal of the Microelectronic Engineering Conference

Design and fabrication of waveguide structures on silicon-on-insulator (SOl) such as couplers and S-bends as components of Mach-Zehnder modulator (MZI) are presented here. These basic devices are important for processing light signals using silicon. Beam propagation method (BPM) was used to obtain dimensions of discussed structures for future manufacturing. During the design of the interferometer it was found that parameters of only either of branches could be altered to induce desired interference effect at the output of MZI. Hence, the device was dubbed unbalanced MZI. Since coupling separation was a factor that determines coupling length, it was chosen to be …

Collecting And Storing Wireless Power From A Rf Source, Justin D. Blair

Journal of the Microelectronic Engineering Conference

This study involved transferring power wirelessly through inductive coupling. The goal was to create a receiver device capable of powering a rectifying circuit and charging a capacitor while being at least 20 mm away from the transmitter device. This device should also be capable of receiving power when separated by non-conductive mediums other than air. The study was successful at transmitting power through an RF transmitter into an RF receiver at voltage ranges of 1V — 14V and ranges of 0cm — 20cm. It was able to charge an 80 nF capacitor to 8.39 V and had a fall time …

An Assessment Of The Use Of Structural Deformation As A Method Of Determining Area Of Fire Origin, Andrew T. Tinsley, David J. Icove

Safety, Security and Emergency Management Faculty and Staff Scholarship

Current methodologies of origin investigation have yet to include the structural deformations seen in steel buildings as a viable indicator of the area of origin of a given fire. As many steel structures are of relatively large size, it is often difficult to determine the area of origin using the typical dig and sift methods advocated in NFPA 921, especially if the extent of the fire was large and there were no witnesses as to the origin of the fire. As has been investigated for years, the performance of steel is highly affected by the application of heat. The science …

A Microstrip Printed Dipole Solar Antenna Using Polycrystalline Silicon Solar Cells, S. Shynu, Maria Roo Ons, Giuseppe Ruvio, Max Ammann, Sarah Mccormack, Brian Norton

Conference papers

A novel printed dipole solar antenna design with an integrated balun is proposed for the first time with high efficiency polycrystalline silicon solar cells is presented in this paper. The optimum orientation of the silver DC bus bars of the solar cell is determined in order to achieve best antenna performance. Good solar antenna performance similar to that of ordinary printed dipoles with PEC reflectors is achieved.

Predictive Control Of A Munition Using Low-Speed Linear Theory, Nathan Slegers

Faculty Publications - Biomedical, Mechanical, and Civil Engineering

"Modified linear theory provides reasonable impact predictions at high speeds. However, for typical small UAS mission speeds, less than 20-m/s impact errors were substantial due to large angles of attack and pitch rates. Low-speed linear theory was developed by including higher-order terms involving w and q that modified linear theory neglects. As a result, the angle of attack, pitch, and yaw predictions are significantly improved, leading to accurate impact predictions even at very low speeds. A predictive control scheme was developed to reduce dispersion using control surfaces near the tail. The predictive controller uses low-speed linear theory to rapidly predict …

The Role Of Diffusive Transport On Low And Intermediate Temperature Hydrocarbon Oxidation: Numerical Simulations Using The Wang-Mou Mechanism, Howard Pearlman, Michael R. Foster

Faculty Publications - Biomedical, Mechanical, and Civil Engineering

The spatio-temporal temperature and species concentration distributions associated with low and intermediate temperature hydrocarbon oxidation are computed using a global thermo kinetic scheme augmented with diffusive transport. The scheme used for the computations was proposed by Wang and Mou and is extended to include diffusion of species and heat. The conservation equations for species and energy are then derived and solved for a one-dimensional and an axisymmetric, spherical domain for temperatures ranging from 540 to 660 Kat subatmospheric pressures. The predictions are then used to develop ignition diagrams for different Lewis ( Le) numbers. Increasing Le is found to promote …

Extracting, Representing And Mining Semantic Metadata From Text: Facilitating Knowledge Discovery In Biomedicine, Cartic Ramakrishnan

Browse all Theses and Dissertations

The information access paradigm offered by most contemporary text information systems is a search-and-sift paradigm where users have to manually glean and aggregate relevant information from the large number of documents that are typically returned in response to keyword queries. Expecting the users to glean and aggregate information has lead to several inadequacies in these information systems. Owing to the size of many text databases, search-and-sift is a very tedious often requiring repeated keyword searches refining or generalizing queries terms. A more serious limitation arises from the lack of automated mechanisms to aggregate content across different documents to discover new …

Development Of A Knowledge Management Strategy For Academic Staff, Leslie Whyte

Dissertations

We are living in a knowledge society. Knowing what we know and managing it better to know more is considered the key enabler to sustainable economic growth. 70 to 80 percent of economic growth is directly attributed to new or better knowledge. With information communication technologies (ICT) readily facilitating the globalisation of economic activity, the key competitive advantage of this era is the ability to create, use and disseminate knowledge effectively. Although traditionally creators, guardians and disseminators of knowledge, universities and institutions need to also adapt to the challenges the knowledge society can bring and evolve their roles in education, …

Work In Progress: Rfid Sports Timing System, James Johnston

Capstone Research Projects

Timing plays a critical role in most sporting events. RFID-based timing solutions offer a high level of automation. Current timing solutions are high in cost and frequently do not offer live results to spectators. Existing RFID hardware is evaluated for suitability in a new timing solution. An architecture for an open source timing solution is then evaluated. The new solution offers a novel combination of features making ownership feasible for smaller sporting events.

Tractor Test 1920: New Holland Tt 75a, Nebraska Tractor Test Lab

Nebraska Tractor Tests

ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …

Effect Of Carbon Black On The Mechanical Performances Of Magnetorheological Elastomers, Lin Chen

Articles

Several magnetorheological elastomer (MRE) samples, with different weight percentages of carbon black, were fabricated under a constant magnetic field. Their microstructures were observed by using an environmental scanning electron microscope (SEM), and their mechanical performance including magnetorheological (MR) effect, damping ratio and tensile strength were measured with a dynamic mechanical analyzer (DMA) system and an electronic tensile machine. The experimental results demonstrate that carbon black plays a significant role in improving the mechanical performance of MR elastomers. Besides the merits of high MR effect and good tensile strength, the damping ratio of such materials is much reduced. This is expected …

Investigation Of Asphalt Pavement Analyzer Testing Program In Nebraska, Minki Hong, Yong-Rak Kim

Mid-America Transportation Center: Final Reports and Technical Briefs

The asphalt pavement analyzer (APA) has been widely used to evaluate hot-mix asphalt (HMA) rutting potential in mix design and quality control – quality assurance (QC-QA) applications, because the APA testing and its data analyses are relatively simple, rapid, and easy. However, as demonstrated in many studies and also experienced by the state of Nebraska, the APA testing is in question due to its high testing variability and a lack of sufficient correlation with actual filed performance. The primary objective of this research was to find critical materials and/or mixture design factors affecting APA test results so as to eventually …

Influence Of Fiber Manufacturing Tolerances On The Spectral Response Of A Bend Loss Based All-Fiber Edge Filter, Pengfei Wang, Gerald Farrell, Yuliya Semenova, Ginu Rajan

Articles

It is shown that manufacturing tolerances of the fiber parameters bend radius and NA significantly influence the fiber bend loss performance and spectral response of a fiber-based edge filter. A theoretical model, validated by experimental results, is used to determine the changes in key spectral parameters for an edge filter, resulting from changes within their manufacturing tolerance range, for both the bend radius and NA. Finally is shown that bend-radius tuning during fabrication of such filters is a means of mitigating the effect of manufacturing variations.

The Role Of Multihaem Cytochromes In The Respiration Of Nitrite In Escherichia Coli And Fe(Iii) In Shewanella Oneidensis, Thomas A. Clarke, Tracey Holley, Robert S. Hartshorne, James K. Fredrickson, John M. Zachara, Liang Shi, David J. Richardson

United States Department of Energy: Publications

The periplasmic nitrite reductase system from Escherichia coli and the extracellular Fe (III) reductase system from Shewanella oneidensis contain multihaem c-type cytochromes as electron carriers and terminal reductases. The position and orientation of the haem cofactors in multihaem cytochromes from different bacteria often show significant conservation despite different arrangements of the polypeptide chain. We propose that the decahaem cytochromes of the iron reductase system MtrA, MtrC and OmcA comprise pentahaem ‘modules’ similar to the electron donor protein, NrfB, from E. coli. To demonstrate this, we have isolated and characterized the N-terminal pentahaem module of MtrA by preparing a …

Significant Redistribution Of Ce 4D Oscillator Strength Observed In Photoionization Of Endohedral Ce@C+82 Ions, A. M. Müller, S. Schippers, M. Habibi, D. A. Esteves, J. C. Wang, R. A. Phaneuf, A. L. D. Kilcoyne, A. Aguilar, L. Dunsch

United States Department of Energy: Publications

Mass-selected beams of atomic Ce^q+ ions (q = 2, 3, 4), of C⁺₈₂ and of endohedral Ce@C⁺₈₂ ions were employed to study photoionization of free and encaged cerium atoms. The Ce 4d inner-shell contributions to single and double ionization of the endohedral Ce@C⁺₈₂ fullerene have been extracted from the data and compared with expectations based on theory and the experiments with atomic Ce ions. Dramatic reduction and redistribution of the ionization contributions to 4d photoabsorption is observed. More than half of the Ce 4d oscillator strength appears to be …

Engineering Microbial Fuels Cells: Recent Patents And New Directions, Justin C. Biffinger, Bradley R. Ringeisen

United States Navy: Publications

Fundamental research into how microbes generate electricity within microbial fuel cells (MFCs) has far outweighed the practical application and large scale development of microbial energy harvesting devices. MFCs are considered alternatives to standard commercial polymer electrolyte membrane (PEM) fuel cell technology because the fuel supply does not need to be purified, ambient operating temperatures are maintained with biologically compatible materials, and the biological catalyst is self-regenerating. The generation of electricity during wastewater treatment using MFCs may profoundly affect the approach to anaerobic treatment technologies used in wastewater treatment as a result of developing this energy harvesting technology. However, the materials …

Me-Em 2008 Annual Report, Department Of Mechanical Engineering-Engineering Mechanics, Michigan Technological University

Department of Mechanical and Aerospace Engineering Annual Reports

Table of Contents

• Engineering Education
• Students
• Alumni
• Resources
• Graduates
• Publications
• ME-EM Community

Quarter-Wave Metal Plate Solar Antenna, S. Shynu, Max Ammann, Brian Norton

Articles

A novel design of a quarter-wave shorted trapezoidal metal plate solar antenna using high efficiency polycrystalline silicon solar cells is presented. Using the DC conductive parts of the cell as RF antenna elements as well as choosing the radiating element to be a small base trapezoid, better coupling between the feed and shorting plates is ensured and 40.3% size reduction compared to a conventional shorted quarter-wave patch is obtained. The trapezoidal radiating element covers merely 2.7% of the total available illumination area of the solar cell, leaving its efficiency essentially unaffected. The proposed design strategy has been verified by an …

Reduced Order Modeling Methods For Turbomachinery Design, Jeffrey M. Brown

Browse all Theses and Dissertations

Design of structural components is constrained by both iteration time and prediction uncertainty. Iteration time refers to the computation time each simulation requires and controls how much design space can be explored given a fixed period. A comprehensive search of the space leads to more optimum designs. Prediction uncertainty refers to both irreducible uncertainties, such as those caused by material scatter, and reducible uncertainty, such as physics-based model error. In the presence of uncertainty, conservative safety factors and design margins are used to ensure reliability, but these negatively impact component weight and design life. This research investigates three areas to …

บทบรรณาธิการ, ประมวล สุธีจารุวัฒน

Journal of Transportation and Logistics (TRANSLOG)

No abstract provided.

ประวัติผลงาน สถาบันการขนส่ง จุฬาลงกณ์มหาวิทยาลัย, สุนันทา เจริญปัญญายิ่ง, วรรณภา บุญนิ่ม

Journal of Transportation and Logistics (TRANSLOG)

No abstract provided.

Improving Supply Chain Performance By Adopting Performance Measument Models, Taweesak Theppitak

Journal of Transportation and Logistics (TRANSLOG)

Nowadays, dynamic changes arc significantly driving forces to companies to re-focusing on utilizing of people and research based on organizational objectives. Organisations need to provide a performance measurement system (PMS) to evaluate the resource utilisation so that they can strategically manage and properly control to achieve their objectives and goals. PM's role is dominantly increasing and it is growing in its scope and importance. However, the literature on performance measurement (PM) has changed over the past few decades. Due to limitation of traditional PMS that focusing on financial measures (ROI. cash flow), modern PMS focusing on non-financial measures such as …

Csi ผลกระทบต่อการขนส่งสินค้าทางตู้คอนเทนเนอร์ของประเทศไทย, สุนันทา เจริญปัญญายิ่ง

Journal of Transportation and Logistics (TRANSLOG)

No abstract provided.

University Of Texas At Tyler Catalog, 2008 - 2010, University Of Texas At Tyler

Catalogs

No abstract provided.

Community-Of-Interest (Coi) Model-Based Languages Enabling Composable Net-Centric Services, Andreas Tolk, Saikou Y. Diallo

Computational Modeling & Simulation Engineering Faculty Publications

Net-centric services shall be designed to collaborate with other services used within the supported Community of Interest (COI). This requires that such services not only be integratable on the technical level and interoperable on the implementation level, but also that they are composable in the sense that they are semantically and pragmatically consistent and able to exchange information in a consistent and unambiguous way.

In order to support Command-and-Control with Composable Net-centric Services, the human-machine interoperation must be supported as well as the machine-machine interoperation. This paper shows that techniques of computer linguistic can support the human-machine interface by structuring …

The Role Of Diffusive Transport On Low And Intermediate Temperature Hydrocarbon Oxidation: Closed Reactor Experiments Using Equimolar N-Butane + Oxygen Premixtures At Reduced-Gravity, Howard Pearlman, Michael R. Foster

Faculty Publications - Biomedical, Mechanical, and Civil Engineering

Experiments were conducted in a closed, spherical reactor aboard NASA's KC-135 reduced-gravity aircraft using an equimolar n-C4H10 + 0 2 premixture ( Le = 1.3) at subatmospheric · pressures to compliment model predictions and further explore the reactive-diffusive structure of cool flames and ignitions. The pressure and radial temperature histories were recorded and analyzed for different initial conditions. In addition, the visible light emission from excited formaldehyde was recorded using an intensified video camera and was observed to be radially symmetric in all cases. Unexpectedly, however, the measured temperature distributions during (and after the passage of) the cool flames and …

A Stochastic Simulation Procedure For Selecting Herbicides With Minimum Environmental Impact, Ben D. Giudice, Arash Massoudieh, Xinjiang Huang, Thomas M. Young

Faculty Publications - Biomedical, Mechanical, and Civil Engineering

A mathematical environmental transport model of roadside applied herbicides at the site scale (∼100 m) was stochastically applied using a Monte-Carlo technique to simulate the concentrations of 33 herbicides in stormwater runoff. Field surveys, laboratory sorption data, and literature data were used to generate probability distribution functions for model input parameters to allow extrapolation of the model to the regional scale. Predicted concentrations were compared to EPA acute toxicity end points for aquatic organisms to determine the frequency of potentially toxic outcomes. Results are presented for three geographical regions in California and two highway geometries. For a given herbicide, frequencies …

Scheduling Maintenance Activities During Planned Outages At Nuclear Power Plants, Alan Mckendall, James Noble, Cerry Klein

Faculty & Staff Scholarship

In order to maintain high production rates, electric power as well as manufacturing plants shut down so that maintenance activities can be performed on machines/equipment. These planned shut downs (outages) usually occur at least once a year and are more frequent for plants with older machines/equipment. The major costs associated with outages are cost of materials, labor cost, and loss of production cost. Due to high cost incurred from loss of production, the objective is to schedule maintenance activities such that outage duration is minimized. Since the resources required to perform maintenance activities are very limited, the problem of scheduling …

Improved Tabu Search Heuristics For The Dynamic Space Allocation Problem, Alan Mckendall

Faculty & Staff Scholarship

The dynamic space allocation problem(DSAP) presented in this paper considers the task of assigning items(resources) to locations during a multi-period planning horizon such that the cost of rearranging the items is minimized. Three tabu search heuristics are presented for this problem. The first heuristic is a simple basic tabu search heuristic. The second heuristic adds diversification and intensification strategies to the first, and the third heuristic is a probabilistic tabu search heuristic. To test the performances of the heuristics, a set of test problems from the literature is used in the analysis. The results show that the tabu search heuristics …