Engineering Commons^™

Fact Sheet: Study Of Long-Term Augmentation Options For The Water Supply Of The Colorado System, Black & Veatch, Ch2m Hill

Navigating the Future of the Colorado River (Martz Summer Conference, June 8-10)

1 page.

"March 2008"

Material submitted by Les Lampe, Colorado River Water Consultants, for "Augmentation Options" program, Session 3: Mapping a New Course, Panel F: Some Policy Options and Solutions.

Colorado River Water Consultants is a project-specific partnership of engineering firms Black & Veatch and CH2MHill.

Position Preference And Diffusion Path Of An Oxygen Ion In Apatite-Type Lanthanum Silicate La9.33si6o26: A Density Functional Study, Ting Liao, Taizo Sasaki, Shigeru Suehara, Ziqi Sun

Australian Institute for Innovative Materials - Papers

Using density functional theory, we investigated the position preference and diffusion mechanisms of interstitial oxygen ions in lanthanum silicate La_9.33Si₆O₂₆, which is an apatite-structured oxide and a promising candidate electrolyte material for solid oxide fuel cells. The reported lanthanum vacancies were explicitly taken into account by theoretically determining their arrangement with a supercell model. The most stable structures and the formation energies of oxygen interstitials were determined for each charged state. It was found that the double-negatively charged state is stable over a wide range of the Fermi level, and that the excess oxygen …

Study On Solidification During Twin-Roll Casting Of Magnesium Alloy, Yucheng Zhang, X Cheng, D Wei, Xiaolin Wang, Z Jiang

Faculty of Engineering - Papers (Archive)

The process of vertical twin-roll casting including pouring, solidifying, roiling and cooling can be accomplished In a very short time. Some Important process parameters In roll casting that are difficult to be obtained experimentally may be acquired by employing numerical simulation. In this paper, a numerical simulation has been conducted based on a 20 finite element model of vertical twin-roil ab1p casting coupling temperature, flow, and thermal stress. The Influences of key process parameters Including submerged nozzle depth and nozzle spray angle have been studied. The distribution of thermal stress was obtained and Its effect on the cracks In the …

A Comparison Study Of The Numerical Integration Methods In The Trajectory Tracking Application Of Redundant Robot Manipulators, Emre Sariyildiz, Hakan Temeltas

Faculty of Engineering and Information Sciences - Papers: Part A

Differential kinematic has a wide range application area in robot kinematics. The main advantage of the differential kinematic is that it can be easily implemented any kind of mechanisms. In differential kinematic method, Jacobian is used as a mapping operator in the velocity space. The joint velocities are required to be integrated to obtain the pose of the robot manipulator. This integration can be evaluated by using numerical integration methods, since the inverse kinematic equations are highly complex and nonlinear. Thus, the performances of the numerical integration methods affect the trajectory tracking application. This paper compares the performances of numerical …

Feasibility Study Of Microgrid Application In Langkawi And Socotra Islands, Ahmed Haidar

Faculty of Engineering and Information Sciences - Papers: Part A

Alternative Energy is becoming a popular and an essential energy resource in the current century. This paper investigates the effect of using a hybrid microgrid system in Langkawi and Socotra Islands. Configuration of the optimal hybrid system is selected based on the best components and its sizing with appropriate operation strategy to provide a cheap efficient, reliable and cost effective system. The total net present cost for the two Islands has been determined using HOMER program based on the Island’s data. This finding will help to install sources of renewable energy in places that will ensure low cost and performance …

Skin Dosimetry Of Thyroid Radioiodine With Moskin Detector: A Phantom Study, K Chuamsaamarkkee, I Fuduli, D Cutajar, C Lian, S Harvey, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part A

Radioiodine treatment is administered radioactive iodine to treat the thyroid cancer or to ablate a thyroid remnant. However, due to the risk of radiation, there is a possibility that the patient will experience side effects. Skin dose is an important parameter for quantifying patient dose. The aim of this study is to use a MOSFET detector for real time skin dosimetry. At the Centre for Medical Radiation Physics (CMRP), University of Wollongong, a new type of MOSFET detector called MOSkin is being developed to measure the skin dose, with real-time read out. This paper discusses the pre-clinical characterization the MOSkin …

Study On Oxidation Of Stainless Steels During Hot Rolling, Z Y. Jiang, D B. Wei, K Tieu, J X. Huang, A W. Zhang, X Shi, S H. Jiao

Faculty of Engineering and Information Sciences - Papers: Part A

The oxidation of stainless steels 304 and 304L during hot rolling is studied in this paper. Results show the oxide scale thickness decreases significantly with an increase of reduction, and the oxide scales of both 304 and 304L stainless steels were found more deformable than the steel substrate. Surface roughness shows a complicated transfer during the hot rolling process due to the complexity of oxide scale characteristics. Also, surface roughness decreases with an increase of reduction. The friction coefficient increases with reduction in all cases, and the increase is more significant in the case of the 304 stainless steel than …

A Comparison Study Of Ellipsoid Fitting For Pose Normalization Of Hippocampal Shapes, Luping Zhou, Oliver Salvado

Faculty of Engineering and Information Sciences - Papers: Part A

Pose normalization is an important step to establish shape correspondence for group comparison of anatomical structures. The most basic and widely used way is ellipsoid fitting, which provides three principal axes for shape alignment, and is often solved by least square fitting. In this paper, it is recognized that the deformation caused by neuro-degenerative diseases is usually locally irregular, behaving like the outliers to the majority of the anatomical surfaces. Therefore we hypothesize that the distance function in L1-norm may perform better than that in L2-norm for hippocampal surface fitting, and thus conduct a study to compare the influence of …

Experimental Study Of High-Strength Concrete Columns Confined With Different Types Of Mesh Under Eccentric And Concentric Loads, Muhammad N. S Hadi, Hua Zhao

Faculty of Engineering - Papers (Archive)

A new idea is investigated in this study to reduce the cover spalling of high-strength concrete columns: installing relatively cheap materials such as household fly screen and wire mesh in the formwork of RC columns. Three materials were chosen in this study: fiberglass fly mesh (FGFM), standard aluminum fly mesh (SAFM), and 12:7 x 12:7 galvanized steel wire mesh (S12.7 WM). A total of 16 cylindricalspecimens with a length of 925 mm and a diameter of 205 mm were cast and tested under concentric, eccentric, and pure bending loading. The testing results showed that S12.7 WM significantly improved the load-carrying …

Neutron Diffraction Study Of The Magnetic Order In Ndmn2ge1.6si0.4, Jianli Wang, Stewart J. Campbell, John M. Cadogan, A J Studer, Rong Zeng, S. X. Dou

Faculty of Engineering - Papers (Archive)

Here we report a detailed investigation of NdMn₂Ge_1.6Si_0.4; this forms part of our investigation of the magnetic order across the NdMn₂Ge_2−xSi_x (x = 0–2.0) series by magnetometry, x-ray diffraction and neutron diffraction over the temperature range 6–465 K. On decreasing the temperature from 465 K, NdMn₂Ge_1.6Si_0.4 exhibits four magnetic transitions: (i) from paramagnetism to intralayer antiferromagnetism AFl at T^Intra_N ~ 430 K; (ii) AFl to canted ferromagnetism Fmc at T^Inter_C ~ 330 K; (iii) Fmc to conical magnetic ordering …

The Work Pattern Of Care Workers In Residential Aged Care Facilities In Australia: A Time And Motion Study, Siyu Qian, Ping Yu, Zhenyu Zhang

Faculty of Engineering and Information Sciences - Papers: Part A

Abstract of paper presented at the 2011 Health Informatics Conference, Brisbane Australia.

Enterprise Soa Implementation Readiness: A Case Study In Malaysia, Mahshitah Abdul Manan, Peter Hyland

Faculty of Engineering and Information Sciences - Papers: Part A

Many vendors have acclaimed Service Oriented Architecture (SOA) as a better way to design and build enterprise-wide software. While these claims may be true in the private sector, there is scant evidence in the literature for the same success in the public sector. The adoption of SOA as the dominant development paradigm within an organisation often requires significant organisational changes, which are difficult to achieve in the public sector, with its strict hierarchies and departmental independence. Indeed, many government departments are not ready to adopt this new paradigm. However, the literature does not provide a suitable SOA readiness framework for …

A Comparative Study Of Three Inverse Kinematic Methods Of Serial Industrial Robot Manipulators In The Screw Theory Framework, Emre Sariyildiz, Eray Cakiray, Hakan Temeltas

Faculty of Engineering and Information Sciences - Papers: Part B

In this paper, we compare three inverse kinematic formulation methods for the serial industrial robot manipulators. All formulation methods are based on screw theory. Screw theory is an effective way to establish a global description of rigid body and avoids singularities due to the use of the local coordinates. In these three formulation methods, the first one is based on quaternion algebra, the second one is based on dual-quaternions, and the last one that is called exponential mapping method is based on matrix algebra. Compared with the matrix algebra, quaternion algebra based solutions are more computationally efficient and they need …

Experimental Study On The Effectiveness Of Prefabricated Vertical Drains Under Cyclic Loading, Cholachat Rujikiatkamjorn, Buddhima Indraratna, Guanghui Meng

Faculty of Engineering - Papers (Archive)

This study is an attempt to investigate the effectiveness of a prefabricated vertical drain (PVD) installed in remoulded soft clay, where a large-scale cyclic triaxial process simulation rig was employed to simulate cyclic loading representing a track environment. The experimental data show that PVD successfully prevents excessive accumulation of pore water pressure during cyclic loading, and their dissipation continues to occur after the load is removed. The findings of this study have direct significance to rail track environments, e.g. in coastal Australia, where PVD installation beneath rail tracks constructed on low-lying estuarine soils has been recently adopted.