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Pipe Flow – A Tutorial For Electrical Engineers, William Ahlgren 2011 California Polytechnic State University - San Luis Obispo

Pipe Flow – A Tutorial For Electrical Engineers, William Ahlgren

Electrical Engineering

Energy is transported over long distances primarily by electric power transmission lines and by pipelines carrying gas or liquid fuel. Electric power engineers need to compare these two energy transmission methods, but often lack knowledge of fluid mechanics pre‐requisite to understanding pipeline transmission. This article provides a focused tutorial to provide the necessary background in the fluid mechanics of pipe flow.


Building A Visual Front-End For Audio-Visual Automatic Speech Recognition In Vehicle Environments, Robert Hursig, Jane Zhang 2011 California Polytechnic State University - San Luis Obispo

Building A Visual Front-End For Audio-Visual Automatic Speech Recognition In Vehicle Environments, Robert Hursig, Jane Zhang

Electrical Engineering

Automatic speech recognition (ASR) holds the promise of providing a natural, efficient, and safer means for communication between humans and computers and can profoundly change the way we live. Since its invention in the 1950s, ASR has witnessed considerable research activities and in recent years is finding its way into practical applications as evidenced by more and more consumer devices such as PDAs and mobile phones adding ASR features. While mainstream ASR has focused almost exclusively on the acoustic signal, the performance of these systems degrades considerably in the real-world in the presence of noise. One way to overcome this ...


Graphene V2o5 Nh2o Xerogel Composite Cathodes For Lithium Ion Batteries, Guodong Du, Kuok Hau Seng, Zaiping Guo, Jun Liu, Wenxian Li, D Z. Jia, Christopher D. Cook, Z Liu, Hua-Kun Liu 2011 University of Wollongong

Graphene V2o5 Nh2o Xerogel Composite Cathodes For Lithium Ion Batteries, Guodong Du, Kuok Hau Seng, Zaiping Guo, Jun Liu, Wenxian Li, D Z. Jia, Christopher D. Cook, Z Liu, Hua-Kun Liu

Faculty of Engineering - Papers (Archive)

A layer structured V2O5·nH2O xerogel was synthesized via a simple green hydrothermal technique by dissolving commercial V2O5 powder in de-ionized water and hydrogen peroxide. Graphene–V2O5·nH2O xerogel composites were then prepared by mixing and filtration of as-prepared V2O5·nH2O xerogel and graphene in the desired ratio. The method is a cost effective and energy saving way to prepare nanostructured composites. Structure and morphology were investigated by X-ray diffraction, thermogravimetric analysis, field emission scanning electron microscopy, and transmission ...


Transverse Current Response In Armchair Graphene Ribbons, Junfeng Liu, Zhongshui Ma, Chao Zhang 2011 Peking University, Beijing, China

Transverse Current Response In Armchair Graphene Ribbons, Junfeng Liu, Zhongshui Ma, Chao Zhang

Faculty of Engineering - Papers (Archive)

We demonstrate that the direction of transverse current in graphene nanoribbons under a magnetic field can be tuned with a gate voltage. It is shown that for armchair ribbons there exist extra energy regions where the direction of the Hall current can be switched between positive and negative values. The directional change of the Hall current coincides with the special points where the two lowest energy bands in the spectrum become degenerate (band crossing points). The number of such degenerate points depends on the width of the ribbons. The dependence of the sign reversal on the gate voltage provides a ...


Enhancement Of The Capacitance In Tio2 Nanotubes Through Controlled Introduction Of Oxygen Vacancies, Maryam Salari, Konstantin K. Konstantinov, Hua-Kun Liu 2011 University of Wollongong

Enhancement Of The Capacitance In Tio2 Nanotubes Through Controlled Introduction Of Oxygen Vacancies, Maryam Salari, Konstantin K. Konstantinov, Hua-Kun Liu

Faculty of Engineering - Papers (Archive)

The many applications of high energy storage devices have forged an increasing interest in research areas related to electrochemical capacitors. Here, in this work, we present a facile method for the fabrication of self-organized titania nanotubes grown by anodic oxidation of titanium foil with different subsequent heat-treatment regimes for use as binder-free working electrodes in supercapacitor applications. The capacitance of these highly ordered titania nanotubes, when exposed to a reductive atmosphere during annealing, was determined to be well above 900 µF cm−2, confirming that the capacitance contribution was pseudocapacitive in nature. The behaviour of oxygen depleted titania in the ...


Slope Hazard Assessment On A Coast Road In New South Wales, Australia, M. Hendrickx, R A. Wilson, A T. Moon, I E. Stewart, Phillip N. Flentje 2011 Coffey Geosciences Pty Ltd

Slope Hazard Assessment On A Coast Road In New South Wales, Australia, M. Hendrickx, R A. Wilson, A T. Moon, I E. Stewart, Phillip N. Flentje

Faculty of Engineering - Papers (Archive)

Lawrence Hargrave Drive was constructed in 1878 and has experienced a continuance of slope failures including rock falls, debris flows and embankment collapses. In 2003 a section of the road was closed for safety reasons. An Alliance between the state government and private industry was formed to develop an engineering solution to reduce the risk to ‘acceptable’ levels. Assessment of slope hazards was completed with the aid of geological mapping, interpretation of aerial photographs, archived government reports, historical photo and newspaper collections and a GIS based landslide inventory. Historical photographs provided important evidence on erosion rates and the size, nature ...


Simulation Of Water And Contaminant Transport Through Vadose Zone - Redistribution System, Thidarat Bunsri, Muttucumaru Sivakumar, Dharmappa Hagare 2011 King Mongkut's University of Technology Thonburi

Simulation Of Water And Contaminant Transport Through Vadose Zone - Redistribution System, Thidarat Bunsri, Muttucumaru Sivakumar, Dharmappa Hagare

Faculty of Engineering - Papers (Archive)

Movement of water in vadose zone, mainly focusing on infiltration and percolation that involves percolation of water under gravity from soil surface and redistribution which is the capillary rise of water movement upwards, is presented. In the global hydrologic cycle, 76% of the precipitating water enters the soil via percolation-infiltration, which leads to the downward movement of water (L’vovich 1974). The water used by natural processes, can move downwards due to infiltration and lift from groundwater table during natural redistribution process. The forecasting of water movement in unsaturated infiltration redistribution system is linked between soil hydraulic properties and hydrologic ...


A Change Analysis Tool For Service-Based Business Processes, Yi Wang, Jian Yang, Weiliang Zhao 2011 University Of Technology Sydney

A Change Analysis Tool For Service-Based Business Processes, Yi Wang, Jian Yang, Weiliang Zhao

Faculty of Engineering - Papers (Archive)

Change management is critical and challenging in the context of service-oriented computing paradigm when multiple services are supported by a single business process [1]. The complex dependencies between services and business processes have not been carefully investigated in the existing work. In particular, it is still lacking of an effective tool to support change impact analysis for coupled services and business processes. In this demo, we present a tool: Service Change Analyzer (SCA) for enabling impact analysis when a change happens. The SCA is built up based on our previous work for change analysis, in which a service-oriented business process ...


A Numerical Study To Evaluate Dynamic Responses Of Voided Concrete Railway Sleepers To Impact Loading, Sakdirat Kaewunruen, Alexander Remennikov, Akira Aikawa 2011 RailCorp

A Numerical Study To Evaluate Dynamic Responses Of Voided Concrete Railway Sleepers To Impact Loading, Sakdirat Kaewunruen, Alexander Remennikov, Akira Aikawa

Faculty of Engineering - Papers (Archive)

The prestressed concrete railway sleepers (or railroad ties), which are installed in railway track systems as the crosstie beam support, are designed to carry and transfer the wheel loads from the rails to the ground. It is well known that railway tracks are subject to impact loading conditions, which are attributable to the train operations with either wheel or rail abnormalities such as flat wheels, dipped rails, etc. These loads are of very high magnitude but short duration. In many cases, it has been reported from the fields that concrete sleepers are lacking of support due to mud pumping or ...


Comprehensive Model Of Oxygen Steelmaking Part 1: Model Development And Validation, Neslihan Dogan, Geoffrey A. Brooks, Akbar Rhamdhani 2011 University of Wollongong

Comprehensive Model Of Oxygen Steelmaking Part 1: Model Development And Validation, Neslihan Dogan, Geoffrey A. Brooks, Akbar Rhamdhani

Faculty of Engineering - Papers (Archive)

A comprehensive model of oxygen steelmaking that includes the kinetics of scrap melting, flux dissolution, slag chemistry, temperature profile of the system, formation and residence of metal droplets in the emulsion, and kinetics of decarburization reaction in different reaction zones was developed. This paper discussed the development and the application of the model into an industrial practice. The results from the model were consistent with the plant data from the study of Cicutti et al. The model suggested that 45% of the total carbon was removed via emulsified metal droplets and the remaining was removed from the impact zone during ...


Geo-Environmental Approaches For The Remediation Of Acid Sulphate Soil In Low-Lying Floodplains, Buddhima Indraratna, Gyanendra Regmi, Long Nghiem, Alexandra N. Golab 2011 University of Wollongong

Geo-Environmental Approaches For The Remediation Of Acid Sulphate Soil In Low-Lying Floodplains, Buddhima Indraratna, Gyanendra Regmi, Long Nghiem, Alexandra N. Golab

Faculty of Engineering - Papers (Archive)

Acidity generated from the oxidation of pyrite and other sulphidic compounds that exist at shallow depths in acid sulphate soils (ASS) presents a challenging environmental problem in coastal Australia. The generated acidic groundwater can adversely impact coastal ecosystems, aquaculture and agriculture. Groundwater manipulation using weirs and modified floodgates in creeks and flood mitigation drains in ASS-affected farmland, which has been practiced for over a decade for preventing pyrite oxidation, is not effective in low-lying floodplains due to the high risk of flooding. In this paper, the authors present an overview of their experience in coastal Australia, a critical evaluation of ...


Non-Destructive Assessment Of Rail Track Condition Using Ground Penetrating Radar, L J. Su, Buddhima Indraratna, C Rujikiatkamjorn 2011 University of Wollongong

Non-Destructive Assessment Of Rail Track Condition Using Ground Penetrating Radar, L J. Su, Buddhima Indraratna, C Rujikiatkamjorn

Faculty of Engineering - Papers (Archive)

Ground penetrating radar (GPR) can be used to locate interfaces and underground utilities, and evaluate ballast fouling conditions, moisture content and subgrade conditions depending on frequencies of antenna and data processing techniques. In Australia, trial testing on railway sections has been conducted by the railway industry. However, in these trials, testing is only conducted on actual tracks where the relationship between track conditions and the GPR response has not yet been established. In this paper, a full scale model rail track designed and constructed at the University of Wollongong is used to investigate factors that infl uence the GPR data ...


Proposal Of A Methodology For Bridge Condition Assessment, Maria Rashidi, Peter Gibson 2011 University of Wollongong

Proposal Of A Methodology For Bridge Condition Assessment, Maria Rashidi, Peter Gibson

Faculty of Engineering - Papers (Archive)

Due to the substantial role of bridges in transportation networks and in accordance with the limited funding for bridge management, remediation strategies have to be prioritised. A conservative bridge assessment will result in unnecessary actions, such as costly bridge strengthening or repairs. On the other hand, any bridge maintenance negligence and delayed actions may lead to heavy future costs or degraded assets. The accuracy of decisions developed by any manager or bridge engineer relies on the accuracy of the bridge condition assessment which emanates from visual inspection. Many bridge rating systems are based on a very subjective procedure and are ...


The Influence Of Copper Content Of Welding Wires On The Fume Formation Rates In Gas Metal Arc Welding Of Steel, N Bothma, B J. Monaghan, J Norrish 2011 University of Wollongong

The Influence Of Copper Content Of Welding Wires On The Fume Formation Rates In Gas Metal Arc Welding Of Steel, N Bothma, B J. Monaghan, J Norrish

Faculty of Engineering - Papers (Archive)

Increases in Fume Formation Rates (FFR) of welding wires have been attributed to the fact that wires are copper coated. Instability during the welding process can have an influence on the FFR. The University of Wollongong has developed an auto control mechanism that will minimise the influence of the instability and this could be applied to more accurately determine the FFR of welding wires in the "drop-spray" mode of transfer.


One-Dimensional Multiferroic Bismuth Ferrite Fibers Obtained By Electrospinning Techniques, Avinash Baji, Yiu-Wing Mai, Qian Li, Shing-Chung Wong, Yun Liu, Qiwen Yao 2011 (CAMT)The University of Sydney, Sydney, NSW

One-Dimensional Multiferroic Bismuth Ferrite Fibers Obtained By Electrospinning Techniques, Avinash Baji, Yiu-Wing Mai, Qian Li, Shing-Chung Wong, Yun Liu, Qiwen Yao

Faculty of Engineering - Papers (Archive)

We report the fabrication of novel multiferroic nanostructured bismuth ferrite (BiFeO3) fibers using the sol–gel based electrospinning technique. Phase pure BiFeO3 fibers were prepared by thermally annealing the electrospun BiFeO3/polyvinylpyrrolidone composite fibers in air for 1 h at 600 °C. The x-ray diffraction pattern of the fibers (BiFeO3) obtained showed that their crystalline structures were rhombohedral perovskite structures. Both scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images revealed that the BiFeO3 fibers were composed of fine grained microstructures. The grains were self-assembled and self-organized to yield dense and continuous fibrous structures ...


Development And Validation Of Calibration Methods For Discrete Element Modelling, Andrew Grima, Peter W. Wypych 2011 University of Wollongong

Development And Validation Of Calibration Methods For Discrete Element Modelling, Andrew Grima, Peter W. Wypych

Faculty of Engineering - Papers (Archive)

Discrete element method (DEM) is proving to be a reliable and increasingly used tool to study and predict the behaviour of granular materials. Numerous particlescale mechanisms influence the bulk behaviour and flow of bulk materials. It is important that the relevant measurable input parameters for discrete element models bemeasured by laboratory equipment or determined by physical calibration experiments for rational results. This paper describes some of the bench-scale experiments that have been developed to calibrate the DEM simulations to reflect actual dynamic behaviour. Relevant parameters such as static and rolling coefficients of friction, coefficient of restitution and interparticle cohesion forces ...


Roadside Rest Area Wastewater Treatment System: Performance Evaluation And Improvement, Adam Kiss, Faisal I. Hai, Long Nghiem 2011 University of Wollongong

Roadside Rest Area Wastewater Treatment System: Performance Evaluation And Improvement, Adam Kiss, Faisal I. Hai, Long Nghiem

Faculty of Engineering - Papers (Archive)

The performance of a decentralised sewage treatment plant located at a rest area servicing a major freeway was investigated. Long term monitoring and rigorous analyses undertaken in this study revealed several unique and challenging issues associated with such scarcely studied systems. Data collected over a six month period showed that the raw wastewater strength was well above typical household wastewater characteristics, with the average BOD5, COD, TOC, TN and TP values of 880, 4900, 350, 238 and 8 mg/L, respectively. The system performance was considerably lower than that expected of a typical wastewater treatment unit. Several shortcomings in ...


Comparing Extreme Programming And Waterfall Project Results, Feng Ji, Todd Sedano 2011 Carnegie Mellon University

Comparing Extreme Programming And Waterfall Project Results, Feng Ji, Todd Sedano

Silicon Valley Campus

Waterfall and Extreme Programming are two software project methods used for project management. Although there are a number of opinions comparing the two methods regarding how they should be applied, none have used project data to clearly conclude which one is better. In this paper, we present the results of a controlled empirical study conducted at Carnegie Mellon University in Silicon Valley to learn about the effective transition from traditional development to agile development. We conducted a comparison research against these two approaches. Multiple teams were assigned a project; some used Waterfall development, others used Extreme Programming. The purpose of ...


Contextualized Mobile Support For Learning By Doing In The Real World, Ray Bareiss, Natalie Linnell, Martin Griss 2011 Carnegie Mellon University

Contextualized Mobile Support For Learning By Doing In The Real World, Ray Bareiss, Natalie Linnell, Martin Griss

Silicon Valley Campus

This research addresses the use of mobile devices with both embedded and external sensors to provide contextualized help, advice, and remediation to learners engaged in real-world learn-by-doing tasks. This work is situated within the context of learning a complex procedure, in particular emergency responders learning to conduct urban search and rescue operations. Research issues include the design and delivery of contextualized performance support and the inferring of learner actions and intentions from sensor data to ensure that the right support is delivered just in time, as it is relevant to what the learner is doing.


Motivating Technical Writing Through Study Of The Environment, J. Linsdell, Thalia Anagnos 2011 San Jose State University

Motivating Technical Writing Through Study Of The Environment, J. Linsdell, Thalia Anagnos

Faculty Publications

No abstract provided.


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