Digital Commons Network^™

Prediction Of Polyphenol Oxidase Activity Using Visible Near-Infrared Hyperspectral Imaging On Mushroom (Agaricus Bisporus) Caps., Edurne Gaston, Jesus Maria Frias, Patrick J. Cullen, Colm O'Donnell, Aoife Gowen

Articles

Physical stress (i.e. bruising) during harvesting, handling and transportation triggers enzymatic discoloration of mushrooms, a common and detrimental phenomenon largely mediated by polyphenol oxidase (PPO) enzymes. Hyperspectral imaging (HSI) is a non-destructive technique that combines imaging and spectroscopy to obtain information from a sample. The objective of this study was to assess the ability of HSI to predict the activity of PPO on mushroom caps. Hyperspectral images of mushrooms subjected to various damage treatments were taken, followed by enzyme extraction and PPO activity measurement. Principal component regression (PCR) models (each with 3 PCs) built on raw reflectance and multiple scatter …

Effect Of Drying Method On The Antioxidant Capacity Of Six Larniaceae Herbs, M. Hossain, Catherine Barry-Ryan, Ana Belen Martin-Diana, N. Brunton

Articles

The present study investigated the changes in total phenols (TP), rosmarinic acid content and antioxidant capacity of six Lamiaceae herbs (rosemary, oregano, marjoram, sage, basil and thyme) after three drying treatments (air-, freeze- and vacuum oven-drying) stored for 60 days at −20 °C and compared to fresh samples. Ferric reducing antioxidant property (FRAP) and oxygen radical absorbance capacity (ORAC) were used as markers for antioxidant capacity. Air-dried samples had significantly (p < 0.05) higher TP, rosmarinic acid content and antioxidant capacity than had freeze-dried and vacuum oven-dried samples throughout the storage period. Fresh samples had the lowest values for the parameters tested. Vacuum oven-drying resulted in higher TP and FRAP values in rosemary and thyme during 60 days of storage than did freeze-drying. In ORAC assay, the difference was significantly higher only in thyme. Storage did not show any effect on the dried samples for the parameters tested.

Can We Be 'Friends'? Social Networking And Student Engagement In An Academic Environment, Mary O'Rawe

Conference papers

Students’ methods of engagement in third level education are very different to those of a decade ago (Cloete, de Villiers & Roodt 2009). There are a number of factors impacting on these changes in students’ profiles, expectations and willingness to engage. One of these factors which is addressed by the author is the way in which students now use social networking tools to engage and communicate. Popular new technologies such as wikis, blogs and podcasts are now being used for academic purposes. But what are the roles of such tools? Do they merely aid staff-student communication and student-student communication, do …

Volume 12, 2010, Ellen Hazelkorn, Nora French, Wolfgang Truetzschler

Issues

No abstract provided.

Dit Graduate Exhibition Show Of The School Of Art, Design And Printing 2010, Dublin Institute Of Technology

DIT Publications

Exhibition committee staff Kieran Corcoran Peter Jones Paul White Robert Tully Neville Knott John Short Brenda Dermody Clare Bell Brenda Duggan Annette Buckley Pat Muldowny Joe Hanly Exhibition commitee student representatives Lucy Clarke Margaret Flynn Kate Geoghegan Gavin Gogarty Fiona O'Keeffe Cian McKenna Becky O'Hara Catalogue concept and design Paul Woods - www.paultheillustrator.com Maeve Keane - www.andstudio.ie Photography by Gillian Buckley. Typeset in DIN 9pt and 24pt. Printed on 140gsm Revive 50/50 by Future Print, Dublin. DIT Graduate Exhibition 2010

A Review Of Bast Fibres And Their Composites. Part 2 - Composites, John Summerscales, Nilmini Dissanayake, Amandeep Virk, Wayne Hall

School of Engineering, Computing and Mathematics

Bast fibres are defined as those obtained from the outer cell layers of the stems of various plants. The fibres find use in textile applications and are increasingly being considered as reinforcements for polymer matrix composites as they are perceived to be "sustainable". The fibres are composed primarily of cellulose which potentially has a Young's modulus of similar to 140 GPa (being a value comparable with man-made aramid [Kevlar/Twaron] fibres). The plants which are currently attracting most interest are flax and hemp (in temperate climates) or jute and kenaf (in tropical climates). Part 2 of this review will consider the …

Context-Dependent Partitioning Of Motor Learning In Bimanual Movements, Ian S. Howard, James N. Ingram, Daniel M. Wolpert

School of Engineering, Computing and Mathematics

No abstract provided.

The Role Of Stereotype Threat In The Underrepresentation Of Minority Students In Gifted Education, M. Erin Potter

Dissertations and Theses @ UNI

Stereotype threat is a social psychological phenomenon that has been demonstrated to negatively affect performance of individuals who are members of non-Asian ethnic minority groups in terms of academic achievement. Although these effects have been documented in adults, very few studies have examined stereotype threat in K-12 students. Further, it is not clear whether stereotype threat could negatively impact students' performance on standardized tests, such as those used for screening for gifted programs. The purpose of this study was to examine whether stereotype threat could be reduced in a sample of Caucasian and African-American middle-school students who were taking a …

Improving The Instruction And Learning Of Topographic Maps Through The Use Of Geospatial Technologies, Troy Dean Schwemm

Dissertations and Theses @ UNI

Geographic information technologies (GIT) are spatially based technologies that include geographic information systems (GIS), remote sensing, and global positioning systems (GPS). Though GIT has been used in society for decades, and has grown tremendously in the last 10 years as advancements in technology have become available, its inclusion into the K-12 curriculum has not kept pace. As the educational reform movement places an ever increasing amount of pressure on schools to produce technologically literate, workforce ready graduates, school districts are scrambling to find creative, innovative ways to accomplish this task. Rather than learning passively, GIT allows students to construct their …

Turning To Community In Times Of Crisis: Globally Derived Insights On Local Community Formation, Glen Kuecker, Martin Mulligan, Yaso Nadarajah

History Faculty publications

No abstract provided.

A Novel Emulator For Discrete-Time Mimo Triply Selective Fading Channels, Fei Ren, Yahong Rosa Zheng

Electrical and Computer Engineering Faculty Research & Creative Works

Hardware implementation of discrete-time triply selective Rayleigh fading channel emulators is proposed for multiple-input multiple-output (MIMO) communications. the proposed work differs from existing ones in that it incorporates temporal correlation, intertap correlation, and spatial correlation matrices into multiple uncorrelated frequency-flat fading waveforms to obtain a triply selective fading channel. the flat fading waveforms with temporal correlation or Doppler spectrum are generated using a sum-of-sinusoid method. the intertap correlation matrix associated with multipath delay spread is computed according to the channel power delay profile and transmit/receive filters. the spatial correlation matrices are predefined inputs associated with transmit and receive antenna arrangements. …

Direct Numerical Simulation Of Hypersonic Turbulent Boundary Layers. Part 2. Effect Of Wall Temperature, L. (Lian) Duan, I. Beekman, M. P. Martín

Mechanical and Aerospace Engineering Faculty Research & Creative Works

In this paper, we perform direct numerical simulation (DNS) of turbulent boundary layers at Mach 5 with the ratio of wall-to-edge temperature T w/T ℘ from 1.0 to 5.4 (Cases M5T1 to M5T5). The influence of wall cooling on Morkovin's scaling, Walz's equation, the standard and modified strong Reynolds analogies, turbulent kinetic energy budgets, compressibility effects and near-wall coherent structures is assessed. We find that many of the scaling relations used to express adiabatic compressible boundary-layer statistics in terms of incompressible boundary layers also hold for non-adiabatic cases. Compressibility effects are enhanced by wall cooling but remain insignificant, and the …

Output Feedback Control Of A Quadrotor Uav Using Neural Networks, Travis Dierks, Sarangapani Jagannathan

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a new nonlinear controller for a quadrotor unmanned aerial vehicle (UAV) is proposed using neural networks (NNs) and output feedback. the assumption on the availability of UAV dynamics is not always practical, especially in an outdoor environment. Therefore, in this work, an NN is introduced to learn the complete dynamics of the UAV online, including uncertain nonlinear terms like aerodynamic friction and blade flapping. Although a quadrotor UAV is underactuated, a novel NN virtual control input scheme is proposed which allows all six degrees of freedom (DOF) of the UAV to be controlled using only four control …

Wikipedia2onto: Building Concept Ontology Automatically, Experimenting With Web Image Retrieval, Huan Wang, Xing Jiang, Liang-Tien Chia, Ah-Hwee Tan

Research Collection School Of Computing and Information Systems

Given its effectiveness to better understand data, ontology has been used in various domains including artificial intelligence, biomedical informatics and library science. What we have tried to promote is the use of ontology to better understand media (in particular, images) on the World Wide Web. This paper describes our preliminary attempt to construct a large-scale multi-modality ontology, called AutoMMOnto, for web image classification. Particularly, to enable the automation of text ontology construction, we take advantage of both structural and content features of Wikipedia and formalize real world objects in terms of concepts and relationships. For visual part, we train classifiers …

The New Childbirth : An Analysis Of Planned Cesarean Sections, Loren Wilbers

Dissertations and Theses @ UNI

This study examines the experience of planned cesarean section delivery as told by six mothers who have given birth utilizing this method. The rate of planned cesarean deliveries being performed in the United States has been increasing over the past two decades. The existing literature attributes this phenomenon to mothers' fear of the pain associated with vaginal birth, desires to imitate celebrities and maintain vaginal tone, and the greed of obstetricians who push for cesarean deliveries for both convenience and financial gain. The voices of mothers themselves is lacking in the existing literature. Thus, this study draws upon a qualitative, …

Imaging The Vasculature With Susceptibility Weighted Imaging: Applications And Analysis, Samuel Barnes

Wayne State University Dissertations

Modern magnetic resonance imaging sequences allow detailed non-invasive imaging of both the arteries and veins. This work is divided into four sections that examine different applications and analysis of these sequences.

Susceptibility weighted imaging (SWI) typically generates excellent negative venous contrast. Techniques to generate positive arterial contrast in SWI images without degrading the venous contrast with a single echo are examined. By using high isotropic resolution and high readout bandwidth flow losses can be minimized (generating good arterial contrast) even at the long echo times required for good venous contrast. A downsampling filter is then used to restore lost venous …

Accelerated Lattice Boltzmann Method For Colloidal Suspensions Rheology And Interface Morphology, Hassan Farhat

Wayne State University Dissertations

ABSTRACT

ACCELERATED LATTICE BOLTZMANN MODEL FOR COLLOIDAL SUSPENSIONS RHEOLOGY AND INTERFACE MORPHOLOGY

by

HASSAN FARHAT

July 2010

Advisor: Dr. Singh Trilochan

Co-Advisor: Dr. Joon Sang Lee

Major: Mechanical Engineering

Degree: Doctor of Philosophy

Colloids are ubiquitous in the food, medical, cosmetic, polymer, water purification and pharmaceutical industries. Colloids thermal, mechanical and storage properties are highly dependent on their interface morphology and their rheological behavior.

Numerical methods provide a cheap and reliable virtual laboratory for the study of colloids. However efficiency is a major concern to address when using numerical methods for practical applications.

This work introduces the main building-blocks for …

Innovative Acoustic Reflection Imaging Techniques And Application To Clinical Breast Tomography, Steve Phillip Schmidt

Wayne State University Dissertations

Conventional ultrasound techniques use beam-formed, constant sound speed ray models for fast image reconstruction. However, these techniques are inadequate for the emerging new field of ultrasound tomography (UST). We present a new technique for reconstruction of reflection images from UST data. We have extended the planar Kirchhoff migration method used in geophysics, and combined it with sound speed and attenuation data obtained from the transmission signals to create reflection ultrasound images that are corrected for refractive and attenuative effects.

The resulting techniques were applied to simulated numerical phantom data, physical phantom data and in-vivo breast data obtained with an experimental …

Buccal Granulocytic Sarcoma (Chloroma), Chieh-Yuan Cheng, Chi-Yuan Tzen, Chung-Ji Liu

Journal of Dental Sciences

A granulocytic sarcoma (GS) is an extramedullary myeloid tumor which can occur in multiple sites around the body. GS rarely occurs in the oral cavity, and most cases are found in pediatric patients. In this report, we describe the case of a 56-year-old male who suffered from right buccal swelling for 1 week. Facial computed tomography revealed a low-density mass over the right buccal area. He was also a victim of acute myeloid leukemia; he had received chemotherapy and experienced remission 6 months later. An intraoral biopsy was performed and proved the mass to be a GS. He was referred …

Evaluation Of Ten Extra-Alveolar Temporary Anchorage Device Insertion Sites By Cone Beam Volumetric Computer Tomography: A Pilot Study, Yi-Jyun Chen, Chia-Tze Kao, Tsui-Hsien Huang

Journal of Dental Sciences

Background/Purpose In order to increase the success rate of temporary anchorage devices (TADs), it is important not to cause root injury or soft-tissue inflammation. The aim of the present study was to evaluate hard- and soft-tissue thicknesses of TAD insertion sites and the perforation ratio with different lengths of TADs by cone beam volumetric computed tomography (CBCT). Materials and methods The hard- and soft-tissue thicknesses were evaluated on 10 patients (5 males and 5 females) by CBCT. The ages ranged 20-36 years. Ten regions of interest (ROIs) in extra-alveolar bone were selected and based on anchorage requirements. Soft-tissue depths were …

Teleoph: A Secure Real-Time Teleophthalmology System, Yongdong Wu, Zhou Wei, Haixia Yao, Zhigang Zhao, Lek Heng Ngoh, Robert H. Deng, Shengsheng Yu

Research Collection School Of Computing and Information Systems

Teleophthalmology (TeleOph) is an electronic counterpart of today's face-to-face, patient-to-specialist ophthalmology system. It enables one or more ophthalmologists to remotely examine a patient's condition via a confidential and authentic communication channel. Specifically, TeleOph allows a trained nonspecialist in a primary clinic to screen the patients with digital instruments (e.g., camera, ophthalmoscope). The acquired medical data are delivered to the hospital where an ophthalmologist will review the data collected and, if required, provide further consultation for the patient through a real-time secure channel established over a public Internet network. If necessary, the ophthalmologist is able to further sample the images/video of …

An Empirical Analysis Of Mobile Voice Service And Sms: A Structural Model, Youngsoo Kim, Rahul Telang, William B. Vogt, Ramayya Krishnan

Research Collection School Of Computing and Information Systems

In addition to the wireless telephony boom, a similar exponentially increasing trend in wireless data service—for example, short message service (SMS)—is visible as technology advances. We develop a structural model to examine user demand for voice service and SMS. Specifically, we measure the own- and cross-price elasticities of these services. The cross-price elasticity is of significant importance because marketing activities are critically influenced by whether the goods are substitutes or complements. The research context poses significant econometric challenges due to three-part tariffs and sequential discrete plan choice and continuous quantity choice decisions. Using detailed individual consumption data of more than …

Artifacts, Actors, And Interactions In The Cross-Project Coordination Practices Of Open-Source Communities, Cecil Eng Huang Chua, Adrian Yong Kwang Yeow

Business and Information Technology Faculty Research & Creative Works

While there has been some research on coordination in FLOSS, such research has focused on coordination within a project or within a group. The area of cross-project coordination, where shared goals are tenuous or non-existent, has been under-researched. This paper explores the question of how multiple projects working on a single piece of existing software in the FLOSS environment can coordinate. Using the Ordering Systems lens, we examine this question via a cross-case analysis of four projects performed on the open source game Jagged Alliance 2 (JA2) in the forum Bear's Pit. Our main findings are that: (1) Ongoing cross-project …

Beyond Europe: Launching Digital Radio In Canada And Australia, Brian O'Neill

Books/Book chapters

Eureka 147 was, as we have argued throughout this volume, a European technology designed within the very particular context of European public service broadcasting (see also Rudin 2006; O'Neill 2009). At the same time, the consortitum behind DAB technology had the ambition that Eureka 147 would become the world standard for digital radio. DAB was indeed the first such technological system to achieve standardisation at the European Telecommunications Standards Institute (ETSI), and be recommended as a global standard for digital terrestrial sound broadcasting by the International Telecommunications Union (ITU).

Analytical Chemistry 2.0, David Harvey

Chemistry & Biochemistry Faculty Publications

No abstract provided.

Portable, Non-Invasive Fall Risk Assessment In End Stage Renal Disease Patients On Hemodialysis, Thurmon Lockhart, Adam T. Barth, Xiaoyue Zhang, Rahul Soangra, Emaad Abdel-Rahman, John Lach

Physical Therapy Faculty Articles and Research

Patients with end stage renal diseases (ESRD) on hemodialysis (HD) have high morbidity and mortality due to multiple causes, one of which is dramatically higher fall rates than the general population. The mobility mechanisms that contribute to falls in this population must be understood if adequate interventions for fall prevention are to be achieved. This study utilizes emerging noninvasive, portable gait, posture, strength, and stability assessment technologies to extract various mobility parameters that research has shown to be predictive of fall risk in the general population. As part of an ongoing human subjects study, mobility measures such as postural and …

High Crimes, Not Misdemeanors: Deterring The Production Of Unsafe Food, Rena I. Steinzor

Faculty Scholarship

In the fall of 2008, Minnesota public health officials became alarmed by an unusually high number of illnesses and deaths caused by salmonella poisoning. Federal and state regulators and the news media eventually traced the outbreak back to products supplied by the Peanut Corporation of America (PCA). Employees shipped batches that tested positive for salmonella from a plant with a leaking roof, mold growing on ceilings and walls, rodent infestation, filthy processing receptacles, and feathers and feces in the air filtration system. Under an agreement with the Food and Drug Administration (FDA), Georgia state inspectors visited the PCA plant nine …

Ignoring The Writing On The Wall: The Role Of Enterprise Risk Management In The Economic Crisis, Michelle M. Harner

Faculty Scholarship

Enterprise risk management (ERM) targets overall corporate strategy and, when implemented correctly, can manage a corporation’s risk appetite and exposure. When ignored or underutilized, it can contribute to a corporation’s demise. In fact, many commentators point to ERM failures as contributing to the severity of the 2008 economic crisis. This essay examines the different approaches to ERM adopted by financial institutions affected by the 2008 economic crisis and how ERM contributed to the survival or failure of those firms. It then considers ERM in the broader context of corporate governance generally. This discussion reflects on ERM techniques for corporate boards …

Notions Of A Learning Society And Learning Partnership Vehicles: The Island's Project, A Case Study, Fergus Murphy

Masters

This case study focuses on the Partnership Vehicle that was jointly developed by the School of Art, Design and Printing at the DIT, and the Sherkin Island Development Society in the period 1998 to 2004, in order to construct and deliver a pilot Fine Art programme on Sherkin Island in West Cork. The pilot programme was delivered on Sherkin from 2000 to 2003, and subsequently, based on the pilot, the School of Art, Design and Printing developed a prototype Fine Art degree aimed at isolated communities. This course is currently being delivered on Sherkin. A third level-community partnership seems an …

Comparison Of In Situ And Columnar Aerosol Spectral Measurements During Texaqs-Gomaccs 2006: Testing Parameterizations For Estimating Aerosol Fine Mode Properties, Dean B. Atkinson, Paola Massoli, Norman T. O'Neill, Patricia K. Quinn, Sarah D. Brooks, Barry Lefer

Chemistry Faculty Publications and Presentations

During the 2006 Texas Air Quality Study and Gulf of Mexico Atmospheric Composition and Climate Study (TexAQS-GoMACCS 2006), the optical, chemical and microphysical properties of atmospheric aerosols were measured on multiple mobile platforms and at ground based stations. In situ measurements of the aerosol light extinction coefficient (σep) were performed by two multi-wavelength cavity ring-down (CRD) instruments, one located on board the NOAA R/V Ronald H. Brown (RHB) and the other located at the University of Houston, Moody Tower (UHMT). An AERONET sunphotometer was also located at the UHMT to measure the columnar aerosol optical depth (AOD). The σep data …