Digital Commons Network^™

Analysis Of Cooling And Heating Of Water With Flat-Plate Solar Radiators, Igor Balen, Vladimir Soldo, David Kennedy

Conference Papers

Extensive analysis of flat-plate radiative panels operation using average hourly weather data for a maritime climate region was performed. The panels are integrated in the space ventilation system with air-cooling by means of a cold-water coil. Their primary function is to prepare sufficient quantity of cold water, integrating radiative and convective cooling, that is collected in the cold-water tank during the nighttime operation. That cold water is used for cooling of the air during daytime. By small modification during daytime, solar panels could be turned into collectors and used to produce the hot water that is collected in a separate …

Feat Monochromator User's Guide, Gary A. Bishop

Fuel Efficiency Automobile Test Publications

No abstract provided.

Infra-Red Divergences In 2+1 Dimensional Gauge Theories, Zakaria Mazumder

School of Engineering, Computing and Mathematics Theses

Quantum field theories generally exhibit divergences. Ultra-violet divergences are treated through the renormalisation programme. Infra-red divergences, which accompany massless particles, are a characteristic of unbroken gauge theories and make it difficult to extract physical predictions. In this thesis we analyse various approaches to the infra-red problem and apply them to 2+1 dimensional gauge theories. These are useful as toy models, are related to the high temperature limit and are important in condensed matter physics. After briefly reviewing various responses to the infra-red problem in 3H-1 dimensions, we begin our study of gauge theories in 2+1 dimensions by performing a one …

Analytical Investigations In Magnetic Recording, Stephen J. C. Brown

School of Engineering, Computing and Mathematics Theses

The Fourier method is used to provide new analytic solutions for idealized mathematical models of double-element shielded magnetoresistive (MR) recording heads. The general two-dimensional model allows analysis of various recording head configurations; a single pole head, a ring head, a dual stripe head and a differential head. The analysis accommodates both longitudinal recording (with no soft magnetic underlayer present) and perpendicular recording (in the presence of a soft underlayer). Typical field, spectral response function and output voltage pulse plots for double-element MR heads are given and compared to published, approximate solutions. The integrals arising in the determination of the Fourier …

Hot Glass, Dick Anderson

Illinois Wesleyan University Magazine, 2002-2017

When Raymond Berger ’70 decided to leave a thriving merchandising career to launch his own company, all he needed was a great idea. He found it in the Czech Republic.

Searching For Greater Variety In Strategic Thinking, Brendan O'Rourke, Martyn Pitt

Conference papers

This paper proposes a use of the discursive approach to explicate variety in ways of strategic thinking. Such an explication of variety is both useful managerially in increasing awareness of greater discursive resources and also theoretically in critiquing views of strategic thinking as homogenous and organizationally contained. Ways of strategic thinking have been investigated using a variety of approaches including expertise perspectives (Voss, Greene et al. 1983), cognitive mapping (Eden, Jones et al. (1979); Huff (1990) ) and upper echelon theory (Hambrick 1998). More recently the linguistic turn in organizational sciences (Alvesson and Kärreman 2000), and the study of strategy …

Wavelet-Based Multi-Carrier Code Division Multiple Access Systems, Ali Muayyadi

School of Engineering, Computing and Mathematics Theses

This thesis proposes a wavelet-based multicarrier CDMA system that uses wavelet basis instead of DFT basis to deal with the problem of inter-channel interference (ICI) and spectral bandwidth efficiency. The theoretical analysis shows that the proposed system has lower side lobe components and higher bandwidth efficiency. The simulation further shows that the wavelet-based multi-carrier CDMA system gives lower ICI and better BER performance than that using DFT basis under multipath fading channel. Moreover the proposed system is more robust against narrow band interference signal. This thesis exploits the wavelet correlation properties to perform timing synchronisation in multicarrier CDMA systems. This …

A Procedural Model For Integrating Physical And Cyberspaces In Architecture, Peter Anders

School of Engineering, Computing and Mathematics Theses

This dissertation articiilates opportunities offered by architectural computation, in particular the digital simulation of space known as virtual reality (VR) and its networked, social variant cyberspace. The thesis will argue that VR/cyberspace has exacerbated differences between architecture's materialist and idealist practices, widening the gap that separates them. In an effort to bridge this gap it presents a procedural model for how VR and cyberspace may be integrated within the practice and product of architecture. The dissertation presents important developments in architectural computation that disclose concepts and values that contrast with orthodox practice. Virtual reality and cyberspace, the foci of this …

Closed-Loop Controlled Total Intra Venous Anaesthesia, Chao Dong

School of Engineering, Computing and Mathematics Theses

Anaesthesia is important for both surgery and intensive care and intravenous anaesthetics are widely used to provide rapid onset, stable maintenance, and rapid recovery compared with inhaled anaesthetics. The aim of the project on which this thesis is based was to investigate a reliable and safe methodology for delivering total intravenous anaesthesia using closed-loop control technology and bispectral analysis of human electroencephalogram (EEG) waveform. In comparison with Target Controlled Infusion (TCI), drug effect is measured during drug infusion in closed loop anaesthesia (CLAN). This may provide superior safety, better patient care, and better quality of anaesthesia whilst relieving the clinician …

A Five-Channel, Single Detector, Emission Remote Sensor (Presentation), Mitchell J. Williams, Donald H. Stedman, Gary A. Bishop, Richard W. Quine

Fuel Efficiency Automobile Test Publications

No abstract provided.

A Framework To Utilise Urban Bus Data For Advanced Data Analysis, Markus Hofmann, Brendan Tierney, Margaret M. O'Mahony

Conference papers

Most urban bus operators collect detailed data on their respective transportation networks using electronic fare collection systems. However, contrary to the opinion of other service industries that this data is a valuable resource, many bus operators have tended not to fully utilise these resources. International experience suggests using innovative technologies and methodologies such as data warehousing, Online Analytical Processing (OLAP), and data mining, to derive the maximum benefit from this data. Still bus operators tend not to keep the full range of data in a form, which is easy to access or utilise, and therefore, are not able to apply …

2003 : Part-Time Programmes, Dublin Institute Of Technology

DIT Publications

Book containing information and full list of part - time courses for 2003 entry.

2003/2004 academic calendar.

Faculty structure and key contacts at DIT.

Adsorption And Reaction Of Benzaldehyde On Porous Glass Studied By Ftir And Tpd, Steven Michael Badger Ii

Dissertations and Theses @ UNI

Benzaldehyde was dosed onto porous borosilicate glass in order to better understand the catalytic behavior of the surface of the porous glass. 18,000 L of benzaldehyde was dosed onto the porous glass at approximately 50 K and heated to a temperature of 470 K. The reactions that occurred were studied using FTIR spectroscopy and Temperature Programmed Desorption (TPD). The FTIR spectrum of the porous glass confirmed the presence of isolated surface hydroxyl groups (Si-OH), seen in the spectrum at 3750 cm1 , and the presence of isolated boron-OH groups, seen in the spectrum at 3700 cm1 . Neighboring surface hydroxyl …

The Effects Of Student Manipulated Lewis Structure Models On Chemistry Achievement According To Cognitive Level, Kimberly M. Ross

Dissertations and Theses @ UNI

The purpose of this study was to determine if there was a correlation between teaching method or cognitive development and achievement in a unit on Lewis electron dot structures. Forty-six students were taught a unit on Lewis electron dot structures using the traditional paper and pencil method. Thirty-eight students were taught the same unit using a manipulative model instead of the traditional method. Both groups of students were given pre and post-tests on Lewis electron dot structures and their gains after instruction were measured. The Group Assessment of Logical Thinking measured student's cognitive level. Students were categorized as concrete, transitional …

Breaking The Stereotypes: Influences And Characteristics Of Academically Talented Women, Joy Leigh Daggs

Dissertations and Theses @ UNI

I was in fifth grade when I heard the word "gifted" for the first time. I had little idea what it meant, but once I was identified that way, my life as a student began to change. I was suddenly expected to perform at my highest level with very little room for error. I learned about the expectations of my performance from my peers, teachers, and parents. They sent me very clear messages about how I was to perform as an academically talented woman. My experience has shaped my research interest for this thesis. In this thesis, I will explore …

Teacher Perceptions Of Iowa Workshop Model Aspects Fostering Use Of Project Wet, Marcene Seavey

Dissertations and Theses @ UNI

State partners of national environmental education (EE) programs contribute to professional development in EE through their program delivery. This study describes teacher perceptions of individual elements of EE workshops provided by one such program, Iowa Project WET. The study found that educators associate three types of workshop activities with successful classroom integration of Project WET activities: ( a) Experiencing activities first-hand, (b) interacting with other educators, and (c) learning about the Project WET Activity and Curriculum Guide. Almost 90% of survey respondents integrate some of the activities they experience during the workshop into their classrooms. Some of these teachers also …

Modeling Fracture In Laminated Automotive Glazing Impacted By Spherical Featureless Headform, Lokeswarappa R. Dharani, S. R. Mettu, S. Zhao, S. D. Barbat, L. Chai

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Laminated glass consisting of two soda lime glass plies adhered by a polyvinyl butyral interlayer (PVB) is used for automotive glazing. This paper describes the application of a dynamic, nonlinear finite element method to investigate the failure modes of a laminated glass subjected to low-velocity impact with a spherical head form. Crack type, crack location and crack initiation time are evaluated using the maximum principal stress and J-integral criterion. Failure occurred due to flexural stresses and not bearing stresses. the first crack always initiated at the center of the outer impacted ply and PVB interface, and later on the exterior …

Multidimensional, Time-Accurate Cfd Simulation Of Adsorption/Desorption In A Carbon Canister, Xingyan Bai, Kakkattukuzhy M. Isaac, D. Klein, R. Banerjee, J. Edson, W. Breig, L. Oliver

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Computational fluid dynamics simulations of fixed-bed adiabatic adsorption/desorption processes are presented in this paper. Linear driving force model is used for heat and mass transfer rates. a two-dimensional cylindrical canister and three-dimensional automotive production canister geometry are used to study the adsorption/desorption processes of carbon dioxide in helium carrier gas on Norit B4 activated carbon. the two-dimensional results compare well with the results of Hwang et al. [1]. Computational results as breakthrough curve, adsorption amount and temperature profiles are provided. Results show that non-adiabatic model should be used to fully utilize the activated carbon bed capacity prior to breakthrough. Copyright …

Million City Traveling Salesman Problem Solution By Divide And Conquer Clustering With Adaptive Resonance Neural Networks, Samuel A. Mulder, Donald C. Wunsch

Electrical and Computer Engineering Faculty Research & Creative Works

The Traveling Salesman Problem (TSP) is a very hard optimization problem in the field of operations research. It has been shown to be NP-complete and is an often-used benchmark for new optimization techniques. One of the main challenges with this problem is that standard, non-AI heuristic approaches such as the Lin-Kernighan algorithm (LK) and the chained LK variant are currently very effective and in wide use for the common fully connected, Euclidean variant that is considered here. This paper presents an algorithm that uses adaptive resonance theory (ART) in combination with a variation of the Lin-Kernighan local optimization algorithm to …

Welcome To The Special Issue: The Best Of The Best, Donald C. Wunsch, Mike Hasselmo, De Liang Wang, Ganesh K. Venayagamoorthy

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

A Preliminary Study Of Sustainable Eco-Industrial Partnerships In The State Of Iowa, Kathleen L. Hennings

Dissertations and Theses @ UNI

The proliferation of industry around the globe, coupled with concerns about the dwindling supply of raw materials, has fostered the emergence of a new manufacturing ideology. In contrast to the linear manufacturing model, raw material in and finished product out, precision manufacturing takes waste material in and provides a new product out. Companies in this study who participated in precision manufacturing were identified as partners when one company sold or traded a waste product to a separate company who used the waste in their primary production. This study was initiated to determine the factors present in successful waste exchange partnerships …

Parents, Educators, Law Enforcement, And Participation In Delinquent Behavior: Gender Socialization And Views Of Life Changes, Jolie Marie Imler

Dissertations and Theses @ UNI

The task of the proposed research is to determine the extent parents, educators, law enforcement, and participation in delinquent behavior influence responses of youth toward their hopefulness for the future and likelihood of attending college and whether the relationships differ by gender. Using gender socialization, social capital, and labeling theories as theoretical backgrounds, it is anticipated that contradictory socialization patterns, gendered access to social capital, and labels influence the resources and responses of female juveniles when considering hopefulness for the future and the likelihood of attending college. The proposed study will use secondary data comprised of youth either adjudicated delinquent …

High Precision Wavelength Measurements Of Qed-Sensitive Forbidden Transitions In Highly Charged Argon Ions, I. Draganić, J. R. Crespo López-Urrutia, Robert D. Dubois, S. Fritzsche, V. M. Shabaev, R. Soria Orts, I. I. Tupitsyn, Y. Zou, J. Ullrich

Physics Faculty Research & Creative Works

We present the results of an experimental study of magnetic dipole ([Formula presented]) transitions in highly charged argon ions (ArX, ArXI, ArXIV, ArXV) in the visible spectral range using an electron beam ion trap. their wavelengths were determined with, for highly charged ions, unprecedented accuracy up to the sub-ppm level and compared with theoretical calculations. the QED contributions, calculated in this Letter, are found to be 4 orders of magnitude larger than the experimental error and are absolutely indispensable to bring theory and experiment to a good agreement. This method shows great potential for the study of QED effects in …

Postcollisional Decay In Ne Multiple Ionization By H2+ Ions In Breakup Collisions, M. M. Sant'anna, H. Luna, Antonio C. Santos, C. Mcgrath, M. B. Shah, E. G. Cavalcanti, G. M. Sigaud, E. C. Montenegro

Physics Faculty Research & Creative Works

We measured the Ne^q+ charge-state yield distribution for Ne atoms multiply ionized by 1-MeV/amu H₂⁺ in coincidence with the final state of the projectile, for both breakup and Non breakup channels. Measurements with 1-MeV H⁺ projectiles were also performed. While the H₂⁺ Non breakup channel produces results similar to equal-velocity proton or electron projectiles, the breakup channels lead to a charge-state yield distribution very close to the known Ne 2s^-1 post collisional decay distribution, measured through photoionization [T. A. Carlson, W. E. Hunt, and M. O. Krause, Phys. Rev. 151, 41 (1966)]. This …

Target Z Dependence And Additivity Of Cross Sections For Electron Loss By 6-Mev/Amu [Formula Presented] Projectiles, R. L. Watson, Yong Peng, V. Horvat, G. J. Kim, Ronald E. Olson

Physics Faculty Research & Creative Works

The dependence of electron loss by 6-MeV/amu Xe¹⁸⁺ on target atomic number was investigated by measuring single-collision cross sections for loss of one to eight electrons in targets of the noble gases He, Ne, Ar, Kr, and Xe. the total-electron-loss cross sections were found to increase linearly with target atomic number, but an abrupt slope change was observed to occur between Ne and Kr. Calculated total-loss cross sections obtained using the n-body classical trajectory Monte Carlo method were in good agreement with the measurements. the dependence of the individual cross sections on the number of electrons lost was reasonably …

Detecting And Representing Relevant Web Deltas In Whoweda, Sanjay Kumar Madria, Wee Keong Ng, Sourav S. Bhowmick

Computer Science Faculty Research & Creative Works

In this paper, we present a mechanism for detecting and representing changes, given the old and new versions of a set of interlinked Web documents, retrieved in response to a user''s query. In particular, we show how to detect and represent Web deltas, i.e., changes in the Web documents that are relevant to a user''s query in the context of our Web warehousing system called WHOWEDA (Warehouse of Web Data). In WHOWEDA, Web information is materialized views stored in Web tables in the form of Web tuples. These Web tuples, represented as directed graphs, can be manipulated using a set …

Cooperative Cleaning For Distributed Autonomous Robot Systems Using Fuzzy Cognitive Maps, H. Subramanian, Cihan H. Dagli

Engineering Management and Systems Engineering Faculty Research & Creative Works

Cooperative Autonomous Cleaning is a simple challenge that can be implemented with the help of Fuzzy Cognitive Maps (FCM) by simulating the actual thinking process of the human. The human mind organizes its thoughts in priorities and this feature could be exploited well if a priori knowledge of the system exists. This technique has been attempted here for a DARS.

An Intelligent Early Warning System For Software Quality Improvement And Project Management, Xiaoqing Frank Liu, Gautam Kane, Monu Bambroo

Computer Science Faculty Research & Creative Works

One of the main reasons behind unfruitful software development projects is that it is often too late to correct the problems by the time they are detected. It clearly indicates the need for early warning about the potential risks. In this paper, we discuss an intelligent software early warning system based on fuzzy logic using an integrated set of software metrics. It helps to assess risks associated with being behind schedule, over budget, and poor quality in software development and maintenance from multiple perspectives. It handles incomplete, inaccurate, and imprecise information, and resolve conflicts in an uncertain environment in its …

Query-Based Learning For Aerospace Applications, Donald C. Wunsch, Emad W. Saad, J. J. Choi, J. L. Vian

Electrical and Computer Engineering Faculty Research & Creative Works

Models of real-world applications often include a large number of parameters with a wide dynamic range, which contributes to the difficulties of neural network training. Creating the training data set for such applications becomes costly, if not impossible. In order to overcome the challenge, one can employ an active learning technique known as query-based learning (QBL) to add performance-critical data to the training set during the learning phase, thereby efficiently improving the overall learning/generalization. The performance-critical data can be obtained using an inverse mapping called network inversion (discrete network inversion and continuous network inversion) followed by oracle query. This paper …

Statistical Simulation Models For Rayleigh And Rician Fading, Chengshan Xiao, Y. Rosa Zheng, N. C. Beaulieu

Electrical and Computer Engineering Faculty Research & Creative Works

New simulation models are proposed for Rayleigh and Rician fading channels. First, the statistical properties of Clarke's fading model with a finite number of sinusoids are analyzed. An improved Clarke's model is then proposed for the simulation of Rayleigh fading channels. Based on this improved Rayleigh fading model, a novel simulation model is proposed for Rician fading channels. The new Rician fading model employs a zero-mean stochastic sinusoid as the specular (line-of-sight) component, in contrast to all existing Rician fading simulators that utilize a non-zero mean deterministic specular component. The statistical properties of the proposed Rician fading model are analyzed …