Engineering Commons^™

Enhanced Stability Of A Dewetting Thin Liquid Film In A Single-Frequency Vibration Field, Mikhail Khenner

Mathematics Faculty Publications

Dynamics of a thin dewetting liquid film on a vertically oscillating substrate is considered. We assume moderate vibration frequency and large (compared to the mean film thickness) vibration amplitude. Using the lubrication approximation and the averaging method, we formulate the coupled sets of equations governing the pulsatile and the averaged fluid flows in the film, and then derive the nonlinear amplitude equation for the averaged film thickness. We show that there exists a window in the frequency-amplitude domain where the parametric and shear-flow instabilities of the pulsatile flow do not emerge. As a consequence, in this window the averaged description …

Enhanced Stability Of A Dewetting Thin Liquid Film In A Single-Frequency Vibration Field, Sergey Shklyaev, Mikhail Khenner, Alexei Alabuzhev

Mathematics Faculty Publications

Dynamics of a thin dewetting liquid film on a vertically oscillating substrate is considered. We assume moderate vibration frequency and large (compared to the mean film thickness) vibration amplitude. Using the lubrication approximation and the averaging method, we formulate the coupled sets of equations governing the pulsatile and the averaged fluid flows in the film, and then derive the nonlinear amplitude equation for the averaged film thickness. We show that there exists a window in the frequency-amplitude domain where the parametric and shear-flow instabilities of the pulsatile flow do not emerge. As a consequence, in this window the averaged description …

The Videoconferencing Classroom: What Do Students Think?, Dr. Anthony Mark Doggett

Architectural and Manufacturing Sciences Faculty Publications

The advantages of video conferencing in educational institutions are well documented. Scholarly literature has indicated that videoconferencing technology reduces time and costs between remote locations, fill gaps in teaching services, increases training productivity, enables meetings that would not be possible due to prohibitive travel costs, and improves access to learning (Martin, 2005; Rose, Furner, Hall, Montgomery, Katsavras, & Clarke, 2000; Townes-Young & Ewing, 2005; West, 1999). However, there are few studies that analyze the effectiveness of videoconferencing from the student’s perspective. Videoconferencing technology is often touted as a method to connect with previously inaccessible student populations, but does it adequately …

Enhanced Stability Of A Dewetting Thin Liquid Film In A Single-Frequency Vibration Field, Sergey Shklyaev, Mikhail Khenner, Alexei Alabuzhev

Mathematics Faculty Publications

Dynamics of a thin dewetting liquid film on a vertically oscillating substrate is considered. We assume moderate vibration frequency and large (compared to the mean film thickness) vibration amplitude. Using the lubrication approximation and the averaging method, we formulate the coupled sets of equations governing the pulsatile and the averaged fluid flows in the film, and then derive the nonlinear amplitude equation for the averaged film thickness. We show that there exists a window in the frequency-amplitude domain where the parametric and shear-flow instabilities of the pulsatile flow do not emerge. As a consequence, in this window the averaged description …

Morphologies And Kinetics Of A Dewetting Ultrathin Solid Film, Mikhail Khenner

Mathematics Faculty Publications

The surface evolution model based on geometric partial differential equation is used to numerically study the kinetics of dewetting and dynamic morphologies for the localized pinhole defect in the surface of the ultrathin solid film with the strongly anisotropic surface energy. Depending on parameters such as the initial depth and width of the pinole, the strength of the attractive substrate potential and the strength of the surface energy anisotropy, the pinhole may either extend to the substrate and thus rupture the film, or evolve to the quasiequilibrium shape while the rest of the film surface undergoes phase separation into a …

Pseudomonas Aeruginosa Infection Of The Auricular Cartilage Caused By “High Ear Piercing”: A Case Report And Review Of The Literature, Henry H. Rowshan, Karen Keith, Dale Baur, Peter Skidmore

United States Army: Publications

Piercing of various parts of the body has gained tremendous popularity among adolescent and adult populations in recent years. There are no exact statistical reports on the number of body piercings being performed in the United States. One study among 481 college students in New York revealed that 42% of men and 60% of women had body piercing. In the past, the majority of complications of ear piercing were associated with the lobule. Torn ear lobes, localized infection, hypertrophic scars, allergic contact dermatitis, and keloid formations were among the most common, with no significant morbidity. However, “high ear piercing,” defined …

Communication Of Medical Information Using Agents, John Mcgrory, Jane Grimson, Frank Clarke, Peter Gaffney

Conference Papers

Agents are self-contained software entities which act faithfully and autonomously on behalf of a body of knowledge. They can operate in a standalone capacity, or as part of a social group collaborating and

coordinating activities with other software agents. To access their knowledge, agents are interfaced with

using message passing communication. The principle behind medical communications is to provide a means

for exchanging information and knowledge from one computerised location to another, whilst preserving its

true meaning and understanding between the listener and sender. Agent communication is similar to medical

communications, but must provide an additional framework element to allow …

The Challenges Of Using Service Learning In Construction Management Curricula, Casey Cline, Michael Kroth

Construction Management Faculty Publications and Presentations

The use of experiential learning as a pedagogical mechanism to facilitate the learning of skills taught in the classroom has become common in college curricula. Service learning and community engagement models are frequently used to combine academic skills with "real-world" experience to foster understanding, and to largely broaden the perspective of the learner. Service-learning and community engagement are both commonly used in construction management (CM) curricula to allow the CM learner to develop a greater understanding of construction materials, processes, and management techniques presented in CM coursework. CM educators, in an effort to formalize the experiential learning process into course …

Cost Of Manufacturing: Experiment To Establish Process-Specific Cost Functions For A Deviation Based Cost Formulation, Parikshit Rajendra Deshmukh

Graduate Research Papers

In the present day global competition, there is incredible pressure on manufacturing unit of a company to reduce the cost of manufacturing, so that company can offer products at low cost. Cost of manufacturing is essential to determine final cost of the product. The cost depends on the type of manufacturing techniques used and the desired level of tolerance, it varies with the tolerance. To formulate the detail cost of manufacturing all the geometric tolerance given has to be evaluated including material, dimensions and machining operations. It is vital to the survival of any business to forecast more effectively the …

Santa Clara Magazine, Volume 50 Number 3, Winter 2008, Santa Clara University

Santa Clara Magazine

12 - ONE GOLD...AND A HOST OF MEMORIES By Ann Killion. A Beijing Olympic scrapbook.

16 - GOD AND WOMAN AT YALE By Steven Boyd Saum. For more than 300 years, the role of Yale University’s chaplain has never been filled by a woman, a layperson, or a Catholic—until now. Meet Sharon M. K. Kugler ’81.

20 - WITH RENEWED VIGOR AND ZEAL By Michael G. Boughton, S.J. How six decrees define the mission of the Society of Jesus in the years to come.

22 - LIBERTY AND THE PURSUIT By Michael S. Malone ’75, MBA ’77. Without meaning to, …

Open-Loop Velocity Planning To Mitigate The Stiction Effect In Pushing Positioning, Laine Mears, Thomas Kurfess

Publications

No abstract provided.

Extended Nonnegative Tensor Factorisation Models For Musical Sound Source Separation, Derry Fitzgerald, Matt Cranitch, Eugene Coyle

Articles

Recently, shift-invariant tensor factorisation algorithms have been proposed for the purposes of sound souce separation of pitched musical instruments. However, in practice, existing alogorithsm require the use of log-frequency spectrograms to allow shift invariance in frequency which causes problems when attempting to resynthesise the separated sources. Further, it is difficult to impose harmonicity constraints on the recovered basis functions. This paper proposes a new additive synthesis-based approach which allows the use of linear-frequency spectrograms as well as imposing strict harmonic constraints, resulting in an improved model. Futher, these additional constraints allow the addition of a source filter model to the …

Musical Source Separation Using Generalised Non-Negative Tensor Factorisation Models, Eugene Coyle, Derry Fitzgerald, Matt Cranitch

Conference papers

A shift-invariant non-negative tensor factorisation algorithm for musical source separation is proposed which generalises previous work by allowing each source to have its own parameters rather a fixed set of parameters for all sources. This allows independent control of the number of allowable notes, number of harmonics and shifts in time for each source. This increased flexibility allows the incorporation of further information about the sources and results in improved separation and resynthesis of the separated sources.

Time And Pitch Scale Modification: A Real-Time Framework And Tutorial, Dan Barry, David Dorran, Eugene Coyle

Conference papers

A framework is presented which is designed to address the issues related to the real-time implementation of time-scale and pitch scale modification algorithms. This framework can be used as the basis for the developments of applications which allow for a seamless real-time transition between continually varying time scale and pitch-scale parameters which arise as a result of manual or automatic intervention.

The Annotation Of Traditional Irish Dance Music Using Matt2 And Tansey, Bryan Duggan, Brendan O'Shea, Mikel Gainza, Padraig Cunningham

Conference papers

Current estimates put the canon of traditional Irish dance tunes at least 7,000 compositions. Given this diversity, a common problem faced by musicians and ethnomusicologists is identifying tunes from recordings. This is evident even in the number of commercial recordings whose title is gan aimn (without name). This work attempts to solve this problem by developing a Content Based Music Information Retrieval (CBMIR) System adapted to the characteristics of traditional Irish music. A system is presented called MATT2 (Machine Annotation of Traditional Tunes) whose primary goal is to annotate recordings of traditional Irish dance music with useful meta-data including tune …

Linear Prediction: The Problem, Its Solution And Application To Speech, Alan O'Cinneide, David Dorran, Mikel Gainza

Conference papers

Linear prediction is a signal processing technique that is used extensively in the analysis of speech signals and, as it is so heavily referred to in speech processing literature, a certain level of familiarity with the topic is typically required by all speech processing engineers. This paper aims to provide a well-rounded introduction to linear prediction, and so doing, facilitate the understanding of the technique. Linear prediction and its mathematical derivation will be described, with a specific focus on applying the technique to speech signals. It is noted, however, that although progress in linear prediction has been driven primarily by …

Metadata Visualisation Techniques For Emotional Speech Corpora, Charlie Cullen, Brian Vaughan, Spyros Kousidis

Conference papers

Our research in emotional speech analysis has led to the construction of dedicated high quality, online corpora of natural emotional speech assets. Once obtained, the annotation and analysis of these assets was necessary in order to develop a database of both analysis data and metadata relating to each speech act. With annotation complete, the means by which this data may be presented to the user online for analysis, retrieval and organization is the current focus of our investigations. Building on an initial web interface developed in Ruby on Rails, we are now working towards a visually driven GUI built on …

Development Of A Construction Sub-Sector Embodied Energy Hybrid Analysis, Adolf Acquaye, Aidan P. Duffy, Biswajit Basu

Working papers

Embodied energy analysis is used to evaluate the total energy consumed by any product during all the stages leading up to its manufacture and delivery and can also be used to determine the energy-related environmental impacts such as CO2 emissions of buildings and other built infrastructure. In the wake of increase global awareness on climate change and the strong link between global warming and CO2 emissions, the role of new and improved analytical models to evaluate the energy embodied in products and its associated environmental impacts therefore takes an important role in environmental research studies. The development of a new …

Experimental And Numerical Investigation Of Wire Waveguides For Therapeutic Ultrasound Angioplasty, Declan Noone (Thesis)

Other resources

Therapeutic ultrasound angioplasty is an emerging minimally invasive cardiovascular procedure for disrupting atherosclerotic lesions using small diameter wire waveguides. The lesions are damaged through a combination of direct ablation, pressure waves, cavitation and acoustic streaming caused by distal-tip displacements at ultrasonic frequencies. Numerical and experimental methods are used to investigate the outputs of the wire waveguides during ultrasonic activation. A commercially available generator and acoustic horn are used in combination with Nickel-Titanium (NiTi) wire waveguides in this study. A laser sensor is used to measure the frequency and amplitude output of the distal tip of the wire waveguide, and this …

Group Delay Performance Of Ultra Wideband Monopole Antennas For Communication Applications, Patrick Mcevoy, Matthias John, Sergio Curto, Max Ammann

Conference papers

While limited in dimensions, the shape of small ultra wideband (UWB) antennas can significantly impact on the required gain pattern stablity and the inherent impulse spreading throughout the bandwidth. The comparative gain performance of a square monopole and two Bezier-spline shaped monopoles (optimised for low insertion losses on small groundplanes) as portable UWB device antennas solutions are reported. By measuring the transmission group delay for the three geometries in paired combinations, the time-domain spreading due to each individual antenna is solved numerically with a system of equations.

Uwb Vivaldi Antenna Based On A Spline Geometry With Frequency Band-Notch, Matthias John, Max Ammann, Patrick Mcevoy

Conference papers

A printed UWB Vivaldi antenna is presented in this paper. Its geometry is based on a novel spline shape and optimised by an efficient global optimisation algorithm. A U-shaped slot is introduced into the geometry to notch out the 5.1 GHz to 5.8 GHz WLAN band. This can be used to mitigate interference between WLAN and UWB systems.

On Surface Currents In A Polycrystalline Solar Cell Acting As Ground Plane For Microstrip Patch Antennas, Maria Roo Ons, S. Shynu, Max Ammann, Sarah Mccormack, Brian Norton

Conference papers

The integration of communication devices with photovoltaic (PV) technology leads to the development of autonomous communication systems distinguished by immunity to grid breakdowns and eco-friendliness.

Rfid: An Ideal Technology For Ubiquitous Computing?, Ciaran O'Driscoll, Daniel Maccormac, Mark Deegan, Fredrick Mtenzi, Brendan O'Shea

Conference papers

This paper presents a review of RFID based approaches used for the development of smart spaces and smart objects. We explore approaches that enable RFID technology to make the transition from the recognized applications such as retail to ubiquitous computing, in which computers and technology fade into the background of day to day life. In this paper we present the case for the use of RFID technology as a key technology of ubiquitous computing due to its ability to embed itself in everday objects and spaces. Frameworks to support the operation of RFID-based smart objects and spaces are discussed and …

Simulation And Parametric Analyses Of A Tubular Solid Oxide Fuel Cell Stack Using Aspen Plus, Wayne Doherty, Anthony Reynolds, David Kennedy

Other resources

In the context of climate change and increasing energy conversion efficiency solid oxide fuel cells (SOFCs) are likely to play an important role in the production of electricity. The tubular SOFC configuration is considered to be the most advanced and is approaching commercialisation. A major advantage of SOFCs over other types of fuel cells is that they can utilise a wide spectrum of fuels (natural gas, coal and biomass syn-gas). This is due to its high operating temperature, which also makes them suitable for integration with gas turbines and for cogeneration. A R&D project is underway to develop a computer …

Power Amplifier Principles And Modern Design Techniques, Vladimir I. Prodanov, Mihai Banu

Electrical Engineering

No abstract provided.

Characteristics Of Urban Arterial Crashes Relative To Proximity To Intersections And Injury Severity, Abhishek Das, Anurag Pande, Mohamed Abdel-Aty, Joseph B. Santos

Civil and Environmental Engineering

Intersections of an urban arterial corridor may influence crashes that occur even beyond their physical area. This study examines the effect of the gradual change in the distance of intersection influence on crash characteristics that explain injury severity outcomes of arterial crashes. The approach adopted involves simultaneous estimation of two variables: an ordinal variable representing crash-injury severity and a binary variable representing crash location (intersection versus segment crashes). The dichotomy in crash location is based on the threshold distance of intersection influence. Five sets of bivariate simultaneous models were estimated by using five threshold distances of influence varying from 0 …

Discovering Indirect Associations In Crash Data Through Probe Attributes, Anurag Pande, Mohamed Abdel-Aty

Civil and Environmental Engineering

Association analysis is a popular data-mining technique for detecting dependencies in transaction databases. The algorithms for discovery of association rules attempt to find the products that tend to sell together. For this purpose, one can treat crashes as individual transactions and crash characteristics as the "products" part of that transaction to discover patterns of the crash characteristics that tend to coexist. The a priori algorithm to search for association rules employs the lower bound on intersection (i.e., joint) frequency of two crash characteristics to ensure that only significant patterns are discovered. Hence, remarkable associations relating crash characteristics that have joint …

Simulated Effects Of Dynamic Row Spacing On Energy And Water Conservation In Semi-Arid Central California Greenhouses, A. Moya, T. Mehlitz, Ilhami Yildiz, S. F. Kelly, C. Hardin

BioResource and Agricultural Engineering

Considerable effort is expended to conserve energy and water in current greenhouse systems, and look for alternative energy sources, especially passive heating and cooling strategies. Proper environmental management systems can significantly change the energy and moisture dynamics of greenhouse production systems. In this study, specifically, influences of dynamic row spacing on energy and water conservation were investigated. A dynamic computer simulation model was used to compare different row spacings, plant heights, and leaf dimensions to draw a conclusion about energy and water conservation. The results showed that using smaller spacings between cucumber crop rows (for instance, 0.5 m instead of …

Simulated Performance Of A Renewable Energy Technology – Heat Pump Systems In Semi-Arid California Greenhouses, C. Hardin, T. Mehlitz, Ilhami Yildiz, S. F. Kelly

BioResource and Agricultural Engineering

In addition to the labor, energy and water consumption are the two main cost drivers in current greenhouse systems. Consequently, considerable effort is expended to conserve energy and water, and look for alternative energy sources, especially environmentally friendly renewable energy sources and technologies. Greenhouses in hot and arid regions also require large quantities of water for irrigation. Using proper technologies and environmental management systems can significantly change the energy and moisture dynamics of greenhouse production systems. This study aims to focus on reducing natural gas, electricity, and water consumption in semi-arid California greenhouses introducing renewable energy heat pump technologies to …

Simulated Effects Of Various Environmental Management Practices On Water Consumption In Open And Confined Greenhouse Systems, Ilhami Yildiz, D. P. Stombaugh

BioResource and Agricultural Engineering

The objective of this study was to evaluate the effects of relative humidity, light management, minimum ventilation rates, CO₂ enrichment and canopy size on water consumption in three different greenhouse systems (conventional, open heat pump, and confined heat pump) in winter, spring, and summer months. Using different relative humidity set points resulted in almost the same relative humidity regimes within the confined greenhouse system, resulting in similar transpiration rates. No difference was observed in transpiration rates in the open system in winter either, because the inside relative humidity levels never reached the 70% and 80% set points. Some differences …