Physical Sciences and Mathematics Commons^™

Split-Step Approach To Electromagnetic Propagation Through Atmospheric Turbulence Using The Modified Von Karman Spectrum And Planar Apertures, Monish Ranjan Chatterjee, Fathi H.A. Mohamed

Electrical and Computer Engineering Faculty Publications

The impact of atmospheric phase turbulence on Gaussian beam propagation along propagation paths of varying lengths is examined using multiple random phase screens. The work is motivated by research involving generation and encryption of acousto-optic chaos, and the interest in examining propagation of such chaotic waves through atmospheric turbulence. A phase screen technique is used to simulate perturbations to the refractive index of the medium through the propagation path. A power spectral density based on the modified von Karman spectrum model for turbulence is used to describe the random phase behavior of the medium.

In recent work, results for the …

Improved Performance Of Analog And Digital Acousto-Optic Modulation With Feedback Under Profiled Beam Propagation For Secure Communication Using Chaos, Fares S. Almehmadi, Monish Ranjan Chatterjee

Electrical and Computer Engineering Faculty Publications

Using intensity feedback, the closed-loop behavior of an acousto-optic hybrid device under profiled beam propagation has been recently shown to exhibit wider chaotic bands potentially leading to an increase in both the dynamic range and sensitivity to key parameters that characterize the encryption. In this work, a detailed examination is carried out vis-à-vis the robustness of the encryption/decryption process relative to parameter mismatch for both analog and pulse code modulation signals, and bit error rate (BER) curves are used to examine the impact of additive white noise.

The simulations with profiled input beams are shown to produce a stronger encryption …

Review: The Wilderness Writings Of Howard Zahniser, Jillian M. Slater

Marian Library Faculty Publications

No abstract provided.

Discovery Of Thienoquinolone Derivatives As Selective And Atp Non-Competitive Cdk5/P25 Inhibitors By Structure-Based Virtual Screening, Arindam Chatterjee, Stephen J. Cutler, Robert J. Doerksen, Ikhlas A. Khan, John S. Williamson

Office for Research Publications and Presentations

Calpain mediated cleavage of CDK5 natural precursor p35 causes a stable complex formation of CDK5/p25, which leads to hyperphosphorylation of tau. Thus inhibition of this complex is a viable target for numerous acute and chronic neurodegenerative diseases involving tau protein, including Alzheimer’s disease. Since CDK5 has the highest sequence homology with its mitotic counterpart CDK2, our primary goal was to design selective CDK5/p25 inhibitors targeting neurodegeneration. A novel structure-based virtual screening protocol comprised of e-pharmacophore models and virtual screening workflow was used to identify nine compounds from a commercial database containing 2.84 million compounds. An ATP non-competitive and selective thieno[3,2- …

Sustainability Research Through The Lens Of Environmental Ethics, Daniel Clifford Fouke, Sukh Sidhu, Robert J. Brecha

Physics Faculty Publications

Two core courses in the curriculum of the University of Dayton’s Sustainability, Energy, and the Environment minor, Sustainability Research I and II, were developed out of the frustration one author, Daniel Fouke, experienced while teaching a traditional course on environmental ethics for the Department of Philosophy. The often-overwhelming nature of environmental problems tended to demoralize both the instructor and the students. Seeking a way to integrate ethical analysis of complex problems with the search for solutions, two courses were proposed that would be team-taught by a philosopher and a scientist or an engineer.

Development of the courses was initially funded …

2014 (Fall), University Of Dayton. Department Of Mathematics

Colloquia

Abstracts of the talks given at the 2014 Fall Colloquium.

Exhibition Handlist, Kathleen M. Webb

Supplemental Media: Catalogue, Handlist, Lectures, Events and More

In preparing for Imprints and Impressions, we ran across many interesting words that have fallen out of the general lexicon. With this booklet, we have brought one back: handlist. Dean Kathleen Webb ran across it in a 1944 booklet from the J. Pierpont Morgan Library in New York City. Though the word no longer appears in most new dictionaries, it’s still in the Oxford English Dictionary:

A list of a particular type or category of things, presented in a readily consultable form; esp. a list of the books or manuscripts in a particular place, on a particular subject, etc.; …

Capacity Planning With Financial And Operational Hedging In Low‐Cost Countries, Lijian Chen, Shanling Li, Letian Wang

MIS/OM/DS Faculty Publications

The authors of this paper outline a capacity planning problem in which a risk-averse firm reserves capacities with potential suppliers that are located in multiple low-cost countries. While demand is uncertain, the firm also faces multi-country foreign currency exposures. This study develops a mean-variance model that maximizes the firm’s optimal utility and derives optimal utility and optimal decisions in capacity and financial hedging size. The authors show that when demand and exchange rate risks are perfectly correlated, a risk- averse firm, by using financial hedging, will achieve the same optimal utility as a risk-neutral firm. In this paper as well, …

Seeing Human Weight From A Single Rgb-D Image, Tam Nguyen, Jiashi Feng, Shuicheng Yan

Computer Science Faculty Publications

Human weight estimation is useful in a variety of potential applications, e.g., targeted advertisement, entertainment scenarios and forensic science. However, estimating weight only from color cues is particularly challenging since these cues are quite sensitive to lighting and imaging conditions. In this article, we propose a novel weight estimator based on a single RGB-D image, which utilizes the visual color cues and depth information. Our main contributions are three-fold.

First, we construct the W8-RGBD dataset including RGB-D images of different people with ground truth weight.

Second, the novel sideview shape feature and the feature fusion model are proposed to facilitate …

Modeling Of Power Spectral Density Of Modified Von Karman Atmospheric Phase Turbulence And Acousto-Optic Chaos Using Scattered Intensity Profiles Over Discrete Time Intervals, Monish Ranjan Chatterjee, Fathi H.A. Mohamed

Electrical and Computer Engineering Faculty Publications

In recent research, propagation of plane electromagnetic (EM) waves through a turbulent medium with modified von Karman phase characteristics was modeled and numerically simulated using transverse planar apertures representing narrow phase turbulence along the propagation path.

The case for extended turbulence was also studied by repeating the planar phase screens multiple times over the propagation path and incorporating diffractive effects via a split-step algorithm. The goal of the research reported here is to examine two random phenomena: (a) atmospheric turbulence due to von Karman-type phase fluctuations, and (b) chaos generated in an acousto-optic (A-O) Bragg cell under hybrid feedback. The …

Realization Of Negative Index In Second-Order Dispersive Metamaterials Using Standard Dispersion Models For Electromagnetic Parameters, Tarig A. Algadey, Monish Ranjan Chatterjee

Electrical and Computer Engineering Faculty Publications

In recent work, electromagnetic propagation velocities for plane waves in dispersive metamaterials were calculated assuming frequency dispersion up to the second order. The three velocities were expressed in terms of dispersive coefficients under certain simplifying constraints. Frequency domains were found to exist around resonances where group and phase velocities are in opposition, implying possible negative index behavior.

In this paper, we incorporate in the derived equations physical models (including Debye, Lorentz and Condon) for material dispersion in permittivity, permeability and chirality in order to further examine the consequences of second-order dispersion leading to negative index for practical cases, and also …

Numerical Investigation Of The Nonlinear Dynamics Of A Hybrid Acousto-Optic Bragg Cell With A Variable Feedback Gain, Monish Ranjan Chatterjee, Hao Zhou

Electrical and Computer Engineering Faculty Publications

Since around 1979, the operation of an acousto-optic Bragg cell under positive first-order feedback via amplification and delay in the loop has been studied extensively by several groups [1-3]. In recent work, the analysis of the nonlinear dynamics (NLD) of the system was extended to include bistable maps and Lyapunov exponents, and application of the chaos for signal encryption and decryption for uniform plane waves. The present work originated with the problem of a variable photodetector aperture opening relative to the first-order light. This potentially complex problem is simplified by assuming instead a variable feedback gain ( β ~ (t)), …

Heat Release Of Polyurethanes Containing Potential Flame Retardants Based On Boron And Phosphorus Chemistries, Vladimir Benin, Bastien Gardelle, Alexander Morgan

Chemistry Faculty Publications

Using a polyurethane of methylene diphenyl isocyanate and 1,3-propane diol, several new non-halogenated aromatic boron and phosphorus flame retardants were evaluated for heat release reduction potential using the pyrolysis combustion flow calorimeter (PCFC). The polyurethanes were prepared in the presence of the potential flame retardants via solvent mixing and copolymerization methods, and were then analyzed via spectroscopic methods to determine if the flame retardant was still present in the final product. PCFC testing on the resulting products showed that the flame retardant molecule can have different effects on heat release depending upon how it is mixed into the polyurethane. Some …

Information Encryption, Transmission, And Retrieval Via Chaotic Modulation In A Hybrid Acousto-Optic Bragg Cell Under Profiled Beam Illumination, Monish Ranjan Chatterjee, Fares S. Almehmadi

Electrical and Computer Engineering Faculty Publications

In recent work, the propagation of a profiled optical beam through an open-loop acousto-optic Bragg cell was examined using a transfer function formalism. The device was also studied under closed-loop via intensity feedback, and shown to exhibit more extended chaotic band responses, thereby potentially increasing the dynamic range and parameter sensitivities of any applied signal and the device operation respectively.

In this paper, simple low- to mid-RF signals (periodic waveforms and low BW audio) are transmitted through the closed-loop system and the resulting encryption and recovery at the receiver are examined especially from the perspective of overall robustness of the …

Nonlocal And Quantum-Tunneling Contributions To Harmonic Generation In Nanostructures: Electron-Cloud-Screening Effects, Michael Scalora, Maria Antonietta Vincenti, Domenico De Ceglia, Joseph W. Haus

Electrical and Computer Engineering Faculty Publications

Our theoretical examination of second- and third-harmonic generation from metal-based nanostructures predicts that nonlocal and quantum-tunneling phenomena can significantly exceed expectations based solely on local, classical electromagnetism. Mindful that the diameter of typical transition-metal atoms is approximately 3 Å, we adopt a theoretical model that treats nanometer-size features and/or subnanometer-size gaps or spacers by taking into account (i) the limits imposed by atomic size to fulfill the requirements of continuum electrodynamics, (ii) spillage of the nearly free electron cloud into the surrounding vacuum, and (iii) the increased probability of quantum tunneling as objects are placed in close proximity.

Our approach …

2014 (Summer), University Of Dayton. Department Of Mathematics

Colloquia

Abstracts of the talks given at the 2014 Colloquium.

Structure Preserving Large Imagery Reconstruction, Ju Shen, Jianjun Yang, Sami Taha Abu Sneineh, Bryson Payne, Markus Hitz

Computer Science Faculty Publications

With the explosive growth of web-based cameras and mobile devices, billions of photographs are uploaded to the internet. We can trivially collect a huge number of photo streams for various goals, such as image clustering, 3D scene reconstruction, and other big data applications. However, such tasks are not easy due to the fact the retrieved photos can have large variations in their view perspectives, resolutions, lighting, noises, and distortions. Furthermore, with the occlusion of unexpected objects like people, vehicles, it is even more challenging to find feature correspondences and reconstruct realistic scenes. In this paper, we propose a structure-based image …

Determination Of Corrosion Inhibitor Lubricity Improver In Jet Fuel By Liquid Chromatography-Electrospray Ionization Mass Spectrometry, David W. Johnson, Milissa Flake, Ryan Adams

Chemistry Faculty Publications

Military jet fuel (JP-8) is very similar to commercial jet fuel (Jet A) except for the presence of three additives, fuel system icing inhibitor, corrosion inhibitor–lubricity improver (CI-LI), and antistatic additive, which are added to improve characteristics of JP-8. Of particular interest is the CI-LI additive; the most common active ingredient is a dimer of linoleic acid. This article focuses on quantification of the active ingredient in the CI-LI additive by liquid chromatography–mass spectrometry (LC–MS). This method will allow the determination of CI-LI content in military jet fuel samples.

A Small Molecule That Binds And Inhibits The Etv1 Transcription Factor Oncoprotein, Marius C. Pop, Nicolas Stransky, Colin W. Garvie, Jean-Philippe Theurillat, Emily C. Hartman, Timothy A. Lewis, Cheng Zhong, Elizabeth K. Culyba, Fallon Lin, Douglas S. Daniels, Raymond Pagliarini, Lucienne Ronco, Angela N. Koehler, Levi A. Garraway

Chemistry Faculty Publications

Members of the ETS transcription factor family have been implicated in several cancers, where they are often dysregulated by genomic derangement. ETS variant 1 (ETV1) is an ETS factor gene that undergoes chromosomal translocation in prostate cancers and Ewing's sarcomas, amplification in melanomas, and lineage dysregulation in gastrointestinal stromal tumors. Pharmacologic perturbation of ETV1 would be appealing in these cancers; however, oncogenic transcription factors are often deemed “undruggable” by conventional methods. Here, we used small-molecule microarray (SMM) screens to identify and characterize drug-like compounds that modulate the biological function of ETV1. We identified the 1,3,5-triazine small molecule BRD32048 as a …

Research Exercise: Ud Iet Dayton Most Metro Chef Ten Question Interview

Stander Symposium Projects

Dayton Most Metro (DMM) is an online regional magazine which has created a ten question interview with local chefs. Currently 20 chef interviews have been completed and uploaded onto the website. DMM’s goal is to add to the amount of interviews posted online this spring 2014, but has run out of the manpower required to do so. The goal behind incorporating the Dayton IET 323 team is to aid DMM in accomplishing its goal. Our team will be conducting interviews with a minimum of eight Dayton area chefs which will be featured on the Dayton Most Metro site. In the …

A Look At Ohio's Past: A Focus On Ordovician And Silurian Period Fossils Found In The Dayton Area

Stander Symposium Projects

Ohio has a rich geologic history involving the Paleozoic era, specifically the Ordovician and Silurian periods of time for the southwestern part of the state. Ohio was once covered with tropical seas, the evidence for which are the marine fossils found in the limestones, dolomites, and shale rocks in the area. This research project involves a comparison of fossils and geological history of Clifton Gorge, Germantown MetroPark and other parks in the Dayton area. This project also includes a guide for educators on how to engage students through the connection of real world experiences at the high school level using …

Can They Ever Feel At Home?: Saudi Student Experiences In Residence Halls

Stander Symposium Projects

Saudi students are choosing to pursue higher education at institutions in the United States at an accelerated rate. As a result, it is essential that administration develop ways to better serve this population. The residence halls at American institutions provide a unique challenge for Saudi students because of certain elements of their culture including religion, gender dynamics, and more. Currently, there is a lack of research on this particular topic. In a one hour semi-structured interviews, participants reflected on their experience in the residence halls as well as provided suggestions for future programming and physical space. Information collected through this …

Related Self-Motives? Examining The Association Between Self-Verification And Self-Handicapping

Stander Symposium Projects

This research examines the association between self-verification and self-handicapping. Self-verification theory states that people tend to seek information verifying how individuals see themselves. Individuals seek verifying feedback about traits or attributes when they are certain about that attribute, regardless of whether the attribute is positive or negative. However, when individuals are uncertain about a particular trait, they tend to engage in a self-presentational strategy called self-handicapping. Self-handicapping is a self-protecting behavior that mitigates the effect of a potential failure that would otherwise be perceived as threatening to one’s sense of self by providing pre-emptive excuses for poor performances. Using data …

Research Exercise: Reading Interventions In Relation To The Ohio Third Grade Guarantee

Stander Symposium Projects

Reading is one of the most critical skills that students learn in their first few years of education. A strong foundation in reading at the early childhood level can promote success in the rest of schooling and beyond. This is especially true for children of poverty; reading abilities and the strong education that follows provide students with opportunities to break the poverty cycle. The importance of reading achievement is a political dimension, as demonstrated by Ohio’s Third Grade Reading Guarantee. This legislation, which has many implications in education, requires that all third grade students who do not pass the Reading …

The Impact Of Exogenous Macro Economic Events On Flyer Fund Stock And Sector Returns

Stander Symposium Projects

A number of academic studies have shown that markets can be "shocked" by macro economic events. A sudden rise in inflation, interest rates, oil prices, just to name a few, can have a material effect on stock prices. In the study we use Bloomberg's Market Factor Model to determine the impact on stock and sector returns for the U.D. Flyer Fund. The Market Factor Model can identify response functions i.e. Betas between S&P 500 stocks and an exogenous variable like interest rates. We will study the impact of rising market volatility (VIX), rising interest rates (10 Yr T-Note) and oil …

Unfamiliar Territory: A Phenomological Study Of International Students Enrolled In A Large Urban Community College

Stander Symposium Projects

International students are choosing community colleges for reasons of affordability, easy access, and as a good place to start their education, especially if English is their second language. There is a deficiency of research surrounding this student population despite an increase in enrollment. With little representation of the ICCS in current literature and with institutions recognizing their value more than ever, an understanding of their experience is needed. This qualitative study sought to explore and understand the shared experience of the international college student enrolled in a large Midwestern urban community college. The method of data collection included personal interviews …

A Social Justice Learning And Living Community Service Project

Stander Symposium Projects

Through a Social Justice Living and Learning Community Project, researchers were given the opportunity to feed numerous families across the Dayton area. They worked with Food bank Inc. to help sort and repackage donated food to give to families in need. The Food bank provides food for approximately 70,000 different people annually.

Application Of A Cobalt Porphyrin And Catalyst In Microbial Fuel Cells

Stander Symposium Projects

A microbial fuel cell (MFC) is a renewable energy device in which microorganisms consume organic matters to generate electricity. These devices have potential utility in wastewater treatment facilities to dually clean the water and generate part of the electricity needed for water treatment. The last decade has seen tremendous advancement in MFC technology, but many challenges remain, particularly with improving performance and efficiency of cathodes. The cathode reduces oxygen to water and traditionally has utilized precious metals as the primary catalytic compound. In these studies, the precious metal in the cathode has been replaced with alternative catalysts, cobalt porphyrins. Porphyrins …

Community Residential Energy Reduction

Stander Symposium Projects

This research evaluates the effectiveness of residential energy reduction programs aimed at cost effective, collective action. One of these energy reduction programs is Dropoly.com, an online game developed by the University of Dayton that aims to connect neighbors and allow them to compete against one another. The guiding question behind the research addresses how to reduce energy consumption in a community. My research presumes that effective community engagement is a central factor in achieving success and evaluates a variety of energy reduction programs based on certain criteria. The chosen criteria assess the programs’ effectiveness by focusing on different means of …

Examining Acculturative Stressors Of The International Student: Following Study Abroad Students In South Korea And Morocco

Stander Symposium Projects

International students, particularly students studying abroad for a limited period of time, face certain challenges in entering and adjusting to a new cultural environment. This research focuses on different barriers to adjustment including language, differences in nonverbal communication, discrimination and academic pressure. By comparing and contrasting the perspectives of various students with the researcher’s experience, this research provides insight into the lived experience of international students and the researcher through on-site fieldwork and interviews conducted over a year on university campuses in South Korea and Morocco. It also discusses the results of the undertaken research and offers suggestions for resolving …