Open Access. Powered by Scholars. Published by Universities.®

Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

145,766 Full-Text Articles 167,546 Authors 56,080,941 Downloads 300 Institutions

All Articles in Engineering

Faceted Search

145,766 full-text articles. Page 4189 of 4199.

Investigation On Effectiveness Of A Prefabricated Vertical Drain During Cyclic Loading, Buddhima Indraratna, Jing Ni, Cholachat Rujikiatkamjorn 2010 University of Wollongong

Investigation On Effectiveness Of A Prefabricated Vertical Drain During Cyclic Loading, Buddhima Indraratna, Jing Ni, Cholachat Rujikiatkamjorn

Faculty of Engineering - Papers (Archive)

The effectiveness of prefabricated vertical drains (PVDs) in enhancing the stability of soft soils during cyclic loading was investigated using triaxial cyclic loading tests. Both undrained and with PVD tests were employed to study the associated excess pore pressure and accumulated strain under the repeated loading condition. The loading frequency and cyclic stress ratio have been chosen to be the variables which influence the performance of soft clays. The experimental results illustrate that with PVDs, the excess pore water pressure generation during cyclic loading decreases significantly. It is found that the excess pore water pressure build up depends on both ...


Soft Soils Improved By Prefabricated Vertical Drains: Performance And Prediction, Buddhima Indraratna, Cholachat Rujikiatkamjorn, V Wijeyakulasuriya, G McIntosh, R Kelly 2010 University of Wollongong

Soft Soils Improved By Prefabricated Vertical Drains: Performance And Prediction, Buddhima Indraratna, Cholachat Rujikiatkamjorn, V Wijeyakulasuriya, G Mcintosh, R Kelly

Faculty of Engineering - Papers (Archive)

The use of prefabricated vertical drains with preloading is now common practice and is proving to be one of the most effective ground improvement techniques known. The factors affecting its performance, such as the smear zone, the drain influence zone, and drain unsaturation, are discussed in this paper. In order to evaluate these effects a large scale consolidation test was conducted and it was found that the proposed Cavity Expansion Theory could be used to predict the characteristics of the smear zone based on the soil properties available. Moreover, the procedure for converting an equivalent 2-D plane strain multi-drain analysis ...


A Study Of The Continous Cooling Behaviour And Effect Of Preheat And Interpass Temperature On The Haz Of High Strength Quenched And Tempered Steel, Lenka Kuzmikova, Mark Callaghan, Nathan Larkin, Robert Scott, Robert De Jong, Huijun Li, John Norrish 2010 University of Wollongong

A Study Of The Continous Cooling Behaviour And Effect Of Preheat And Interpass Temperature On The Haz Of High Strength Quenched And Tempered Steel, Lenka Kuzmikova, Mark Callaghan, Nathan Larkin, Robert Scott, Robert De Jong, Huijun Li, John Norrish

Faculty of Engineering - Papers (Archive)

In this study, the continuous cooling phase transformation behaviour of a quenched and tempered armour steel was investigated. A continuous cooling transformation diagram was constructed providing valuable information for predicting microstructural evolution and mechanical properties at different cooling rates during actual welding fabrication. Welding trials were carried out utilising flux-cored arc welding technique in combination with an austenitic stainless steel consumable. The effect of various preheat and interpass temperatures on cooling rate and consequently on the heat affected zone microstructure and mechanical properties of multipass welds were investigated.


Recent Advances In The Application Of Vertical Drains And Vacuum Preloading In Soft Soil Stabilisation, Buddhima Indraratna 2010 University of Wollongong

Recent Advances In The Application Of Vertical Drains And Vacuum Preloading In Soft Soil Stabilisation, Buddhima Indraratna

Faculty of Engineering - Papers (Archive)

Much of the world's essential infrastructure is built along congested coastal belts that are composed of highly compressible and weak soils up to significant depths. Soft alluvial and marine clay deposits have very low bearing capacity and excessive settlement characteristics, with obvious design and maintenance implications on all structures and large commercial buildings, as well as port and transport infrastructure. Stabilising these soft soils before commencing construction is essential for both long term and short term stability. Pre-construction consolidation of soft soils through the application of a surcharge load alone often takes too long, apart from which, the load ...


Effect Of Microstructural Morphology On The Mechanical Properties Of Titanium Alloys, A Dehghan-Manshadi, Mark H. Reid, R J. Dippenaar 2010 University of Wollongong

Effect Of Microstructural Morphology On The Mechanical Properties Of Titanium Alloys, A Dehghan-Manshadi, Mark H. Reid, R J. Dippenaar

Faculty of Engineering - Papers (Archive)

Different morphologies of α+β microstructures were obtained in a commercial Ti-6Al-4V alloy by cooling at different rates from the single β-phase region into the two phase region. The effect of such morphologies on mechanical properties was studied using hot compression tests in a Gleeble thermomechanical simulator. A variety of complex morphologies could be obtained since the cooling rate has a significant influence on the β to α phase transformation and the resulting morphological development. While most of the β phase transformed to colonies of α at high cooling rates, it was possible to obtain a complex mixture of a ...


A Study Of The Strength Of Lime Treated Soft Clays, Martin D. Liu, Stephen Pemberton, Buddhima Indraratna 2010 University of Wollongong

A Study Of The Strength Of Lime Treated Soft Clays, Martin D. Liu, Stephen Pemberton, Buddhima Indraratna

Faculty of Engineering - Papers (Archive)

In this paper, a comprehensive study of the strength of lime treated soft clays is made. There are three major factors that affect the strength of the soils; they are the lime content, curing time, and curing temperature. The variations of soil strengths with the three factors are analysed and quantified via proposed empirical equations. These equations are verified against experimental data. Finally, a general strength criterion, unifying the influence of all the three factors into a single equation, is proposed. The capacity of the general equation is also demonstrated. It is seen that the proposed strength equations can provide ...


Performance Of A Prb For The Remediation Of Acidic Groundwater In Acid Sulfate Soil Terrain, Buddhima Indraratna, Gyanendra Regmi, Long Nghiem, A. Golab 2010 University of Wollongong

Performance Of A Prb For The Remediation Of Acidic Groundwater In Acid Sulfate Soil Terrain, Buddhima Indraratna, Gyanendra Regmi, Long Nghiem, A. Golab

Faculty of Engineering - Papers (Archive)

Contaminated groundwater resulting from pyrite oxidation of acid sulfate soils (ASSs) is a major environmental problem in coastal Australia. A column test was carried out for an extended period with recycled concrete to study the efficiency of the reactive materials for neutralizing acidic groundwater. Results show that the actual acid neutralization capacity of the recycled concrete could decrease to less than 50% of the theoretical value due to armoring effects. Nevertheless, the performance is good as a spot treatment in ASS Terrain using a near-zero cost waste product. Based on the test results and site characterization, a permeable reactive barrier ...


Internal Erosional Behaviour Of Lignosulfonate Treated Dispersive Clay, J S. Vinod, Buddhima Indraratna, M A. A Mahamud 2010 University of Wollongong

Internal Erosional Behaviour Of Lignosulfonate Treated Dispersive Clay, J S. Vinod, Buddhima Indraratna, M A. A Mahamud

Faculty of Engineering - Papers (Archive)

Internal erosional behaviour of lignosulfonate treated dispersive clay has been studied using the Process Simulation Apparatus for Internal Crack Erosion (PSAICE) designed and built at UOW. Effectiveness of lignosulfonate treated dispersive clay on the erosion resistance has been investigated and its advantage over traditional admixtures is presented. Test results show that the hydraulic shear stress increases with increase in the amount of lignosulfonate. In addition, the micro-chemical analysis has been carried out using FTIR. Based on the Fourier Transform Infrared (FTIR) Spectroscopy results a stabilization mechanism has been proposed for lignosulfonate treated dispersive soil.


Adding Value To Physics Laboratories For Pre-Service Teachers, Lorna Jarrett, George J. Takacs, Brian Ferry 2010 University of Wollongong

Adding Value To Physics Laboratories For Pre-Service Teachers, Lorna Jarrett, George J. Takacs, Brian Ferry

Faculty of Engineering - Papers (Archive)

This project focussed on first-year physics laboratories for pre-service teachers. It aimed to make laboratories more aligned to future teachers’ needs; contributing to their confidence with apparatus, conceptual understanding and effectiveness as communicators. However, our approach is also relevant to mainstream science laboratories. First, we flagged links with practical investigations in the NSW High School year 11 / 12 physics syllabus in the lab manual. Second, we incorporated qualitative multiple-choice questions at strategic points based on the Peer Instruction work of Mazur (1996), Crouch and Mazur (2001) and Cox and Junkin III (2002). Finally we employed principles of Cognitive Load Theory ...


Transferring Advanced Physics Research Tools To Education: How To Teach Simulation Tools Used In Radiation Physics Research To University Students, Susanna Guatelli, Catherine Anne Layton, Dean L. Cutajar, Anatoly B. Rosenfeld 2010 University of Wollongong

Transferring Advanced Physics Research Tools To Education: How To Teach Simulation Tools Used In Radiation Physics Research To University Students, Susanna Guatelli, Catherine Anne Layton, Dean L. Cutajar, Anatoly B. Rosenfeld

Faculty of Engineering - Papers (Archive)

At the Centre of Medical Radiation Physics (CMRP), School of Engineering Physics, Faculty of Engineering, at the University of Wollongong (UOW), we are implementing a hands-on computing laboratory, commencing in autumn 2010, to teach scientific computing methods and modern, advanced research tools for radiation physics to postgraduate and undergraduate students. Engaging undergraduates and postgraduates together in work with a tool widely used in research laboratories is a unique development, and represents the articulation of the University’s commitment to the enhancement of the teaching/research nexus, and to the development of learning communities. The object of the laboratory is to ...


Buoyancy-Driven Flows In Pipelines - Effect On Hydrostatic Test Measurements, Ajit Godbole, Paul Cooper, Phillip Venton, John Hough 2010 University of Wollongong

Buoyancy-Driven Flows In Pipelines - Effect On Hydrostatic Test Measurements, Ajit Godbole, Paul Cooper, Phillip Venton, John Hough

Faculty of Engineering - Papers (Archive)

No abstract provided.


A Polynomial Chaos-Based Kalman Filter Approach For Parameter Estimation Of Mechanical Systems, Emmanuel D. Blanchard, Corina Sandu, Adrian Sandu 2010 Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA

A Polynomial Chaos-Based Kalman Filter Approach For Parameter Estimation Of Mechanical Systems, Emmanuel D. Blanchard, Corina Sandu, Adrian Sandu

Faculty of Engineering - Papers (Archive)

Mechanical systems operate under parametric and external excitation uncertainties. The polynomial chaos approach has been shown to be more efficient than Monte Carlo for quantifying the effects of such uncertainties on the system response. Many uncertain parameters cannot be measured accurately, especially in real time applications. Information about them is obtained via parameter estimation techniques. Parameter estimation for large systems is a difficult problem, and the solution approaches are computationally expensive. This paper proposes a new computational approach for parameter estimation based on the extended Kalman filter (EKF) and the polynomial chaos theory for parameter estimation. The error covariances needed ...


Designing A Landslide Database; Lessons From Australian Examples, C. Mazengarb, P. Flentje, Anthony Miner, M. Osuchowski 2010 Mineral Resources Tasmania

Designing A Landslide Database; Lessons From Australian Examples, C. Mazengarb, P. Flentje, Anthony Miner, M. Osuchowski

Faculty of Engineering - Papers (Archive)

The Australian Geomechanics Society 2007 Landslide Risk Management Guidelines stress the importance of developing inventories of landslides in order to underpin better land management decisions and facilitate landslide research . In the absence of a definitive (and published) data model for the inventory a number of landslide databases have been created in Australia to serve a range of purposes, all of which pre-date the guidelines. We outline a project undertaken to develop a website linking four disparate landslide databases together using network service oriented interoperability concepts and technology. From this project we have learned a number of important lessons. Digital landslide ...


Geotechnical Analysis Of Slopes And Landslides: Achievements And Challenges, R. Chowdhury, P. Flentje 2010 University of Wollongong

Geotechnical Analysis Of Slopes And Landslides: Achievements And Challenges, R. Chowdhury, P. Flentje

Faculty of Engineering - Papers (Archive)

PRIMARY OBJECTIVES

Design Safe Slopes, Understand Performance of Slopes and Earth Dams, Quantify Landslide Susceptibility, Hazard and Risk, Landslide Risk Management, Reduction of Disaster Risk

ESSENTAIL INFORMATION

REGIONAL---Geology, Topography, Urbanisation, Landslide History, Triggering Factors(Rainfall ,Earthquakes etc)

SITE-SPECIFIC----Soil and Rock Types, Discontinuities ,Pore Water Pressures, Shear Strength Parameters, Unsaturated Zones, Observed Slope Movements, Quality of Data

IMPORTANT STEPS

Identify Failure Mechanisms, Develop Geotechnical Models, Parameter Variability, Systematic Uncertainties, Assess Stability/Reliability/Hazard /Risk, Validate with Respect to Observed Data


Periodic And Continuous Landslide Monitoring To Assess Landslide Frequency – Selected Australian Examples, P. Flentje, R. Chowdhury, Anthony Miner, C. Mazengarb 2010 University of Wollongong

Periodic And Continuous Landslide Monitoring To Assess Landslide Frequency – Selected Australian Examples, P. Flentje, R. Chowdhury, Anthony Miner, C. Mazengarb

Faculty of Engineering - Papers (Archive)

Landslide frequency is one of the major challenges that must be managed when undertaking a landslide risk assessment. Important issues to be considered when assessing landslide frequency include recognition of the landslide types and processes, landslide volume and magnitudes of displacement. Landslide frequency assessments must also recognize anthropogenic factors (in place and or proposed) such as any remedial measures (subsurface drainage and or retaining structures) as such works will be designed to have significant effects in reducing the frequency of landsliding at any site. Periodic and or continuous monitoring will certainly be of benefit in such assessments, but will only ...


A Comparative Study Of Various Data Mining Techniques As Applied To The Modeling Of Landslide Susceptibility On The Bellarine Peninsula, Victoria, Australia, Anthony Miner, P. Vamplew, D. J. Windle, P. Flentje, P. Warner 2010 University of Ballarat

A Comparative Study Of Various Data Mining Techniques As Applied To The Modeling Of Landslide Susceptibility On The Bellarine Peninsula, Victoria, Australia, Anthony Miner, P. Vamplew, D. J. Windle, P. Flentje, P. Warner

Faculty of Engineering - Papers (Archive)

Numerous techniques exist for modeling landslide susceptibility including heuristic, statistical and deterministic analyses. More recently, knowledge-based techniques have been explored including data mining approaches whereby key data sets are assessed to establish inter-relationships with the primary training set, in our case, landslides. This paper analyses a study area of approximately 800 km2 on the Bellarine Peninsula in Victoria, Australia where landslides are restricted mainly to the coastal fringes and as such, form a ‘rare data set’ for the overall region. This paucity of training data presents problems for traditional susceptibility methods and, as a result, a series of trials using ...


Landslide Recognition Using Lidar Derived Digital Elevation Models-Lessons Learnt From Selected Australian Examples, Anthony Miner, P. Flentje, C. Mazengarb, D. J. Windle 2010 AS Miner Geotechnical, Australia

Landslide Recognition Using Lidar Derived Digital Elevation Models-Lessons Learnt From Selected Australian Examples, Anthony Miner, P. Flentje, C. Mazengarb, D. J. Windle

Faculty of Engineering - Papers (Archive)

The increasing use of LiDAR or airborne laser scanning (ALS) data throughout the world has facilitated widespread access to high resolution current digital elevation models (DEM). Such high resolution DEM’s have proved to be particularly useful in the recognition of landslides and erosion. This is an increasingly important issue in Australia given the publication of the recent Australian Geomechanics Society’s guidelines for landslide risk management which emphasizes the need for improved regional and local landslide inventories. This paper presents recent examples of landslide recognition using such DEM’s from around Australia. Insight is provided into the overall landslide ...


Sorption Of Steroidal Hormones By Electrodialysis Membranes, Laura J. Banasiak, Andrea I. Schafer 2010 University of Wollongong

Sorption Of Steroidal Hormones By Electrodialysis Membranes, Laura J. Banasiak, Andrea I. Schafer

Faculty of Engineering - Papers (Archive)

The mechanisms of sorption of four steroidal hormones – estradiol, estrone, progesterone and testosterone – to electrodialysis (ED) membranes were investigated as a function of solution pH and presence of humic acid (HA). Hormone-membrane partition coefficients (log KAEM/CEM) determined through sorption isotherm experiments suggested that hormone sorption was due to hydrogen bonding and cation–π interactions between hormone and membrane functional groups. Progesterone sorption at pH 7 (922 μg/cm3) during ED was greater than estrone sorption (591 μg/cm3) due to its greater cation-exchange membrane (CEM) bonding affinity. Estrone sorption at pH 11 (487 μg/cm3) was reduced due to ...


Kinetics Of Decarburization Reaction In Oxygen Steelmaking Process, Neslihan Dogan, Geoffrey A. Brooks, Muhammad A. Rhamdhani 2010 University of Wollongong

Kinetics Of Decarburization Reaction In Oxygen Steelmaking Process, Neslihan Dogan, Geoffrey A. Brooks, Muhammad A. Rhamdhani

Faculty of Engineering - Papers (Archive)

The steelmaking process is complex since it involves simultaneous multi-phase (solidgas- liquid) interactions, chemical reactions, heat and mass transfer and complex flow patterns at high temperatures. The transient nature of the process also adds more complexities and the severe operating conditions inhibit the direct measurement and observation of the process. This difficulty can be addressed by developing models, which make it possible to describe the complicated nature of the process itself and to understand the interconnection of important process variables. A global model of oxygen steelmaking focusing on the overall decarburization of the process and including the new bloated droplet ...


Liquid Iron Wetting Of Calcium Aluminates, Brian J. Monaghan, Michael Chapman, Sharon A. Nightingale 2010 University of Wollongong

Liquid Iron Wetting Of Calcium Aluminates, Brian J. Monaghan, Michael Chapman, Sharon A. Nightingale

Faculty of Engineering - Papers (Archive)

An investigation has been carried out to assess the wetting behaviour of liquid iron carbon alloys on alumina, CA6 (CaO · 6Al2O3), CA2 (CaO · 2Al2O3) and CA (CaO · Al2O3). The melt compositions studied were 2 and 5 mass% [C] over a temperature range of 1 450 to 1 550°C. It was found that the systems studied were in general non-wetting, and that the contact angle dropped from approximately 140° to 110° as the calcium content of the substrates increased. The data for alumina were in good agreement with the literature. These data have been used to assess whether capillary phenomena ...


Digital Commons powered by bepress