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Full-Text Articles in Social and Behavioral Sciences

The Social And Behavioral Implications Of Location-Based Services, Katina Michael, M.G. Michael Nov 2011

The Social And Behavioral Implications Of Location-Based Services, Katina Michael, M.G. Michael

Associate Professor Katina Michael

The social and behavioral implications of location-based services (LBS) are only now beginning to come to light in advanced markets where the services have been adopted by just a little over half the market (Microsoft 2011). Depending on one’s definition of what constitutes location-based services, statistics on the level of adoption differ considerably. While it is helpful to provide as broad a list of applications as possible in what constitutes LBS (e.g. everything from in-vehicle navigation systems to downloading a map using a computer), it can also cloud the real picture forming behind this emerging technology. Emerging not ...


Reliability Analysis Of Strain-Softening Slopes, Robin N. Chowdhury, Gautam Bhattacharya Jan 2011

Reliability Analysis Of Strain-Softening Slopes, Robin N. Chowdhury, Gautam Bhattacharya

Faculty of Engineering and Information Sciences - Papers: Part A

Slope reliability must be considered in the context of a variety of factors which control or influence stability or the balance between disturbing and resisting forces. The problems of slope stability are varied, ranging from fi rst-time failures to reactivated landslides and from minor, localized slope movements to catastrophic events. Reliability analysis within a probabilistic framework offers a very powerful tool for taking into consideration the variability of key geotechnical parameters as well as other uncertainties. In this paper, the progressive decrease in shear strength along potential slip surfaces is considered in terms of a residual factor treated as one ...


Effect Of Magnetostatic Field On Microstructure Of 5005 Aluminum Alloy Sheet By Roll-Casting, Jintao Li, Guangming Xu, Jianzhong Cui Jan 2011

Effect Of Magnetostatic Field On Microstructure Of 5005 Aluminum Alloy Sheet By Roll-Casting, Jintao Li, Guangming Xu, Jianzhong Cui

Faculty of Engineering and Information Sciences - Papers: Part A

The roll-casting technology of 5000 series aluminum alloy is one of the difficulties at present. Roll-casting technology was employed in this paper and high quality 5005 aluminum alloy sheets were fabricated successfully under different conditions. The solidification of melt in roll-casting process is the rapid directional solidification. The effect of magnetostatic field on microstructure of 5005 aluminum alloy sheet by roll-casting has been investigated and analyzed. The results indicate that imposing magnetostatic field can refine the grains of 5005 aluminum alloy.


Fuzzy Universal Hashing And Approximate Authentication, Rei Safavi-Naini, Joseph Tonien Jan 2011

Fuzzy Universal Hashing And Approximate Authentication, Rei Safavi-Naini, Joseph Tonien

Faculty of Engineering and Information Sciences - Papers: Part A

No abstract provided.


Influence Of Angular Orientation Of The Embedded Highly Birefringent Fiber On Pmd Changes Under Axial Stress, Daniel Budaszewski, Piotr Lesiak, Robert Plaga, Ginu Rajan, Yuliya Semenova, Gerald Farrell, Anna Boczkowska, Andrzej Domanski, Tomasz Wolinski Jan 2011

Influence Of Angular Orientation Of The Embedded Highly Birefringent Fiber On Pmd Changes Under Axial Stress, Daniel Budaszewski, Piotr Lesiak, Robert Plaga, Ginu Rajan, Yuliya Semenova, Gerald Farrell, Anna Boczkowska, Andrzej Domanski, Tomasz Wolinski

Faculty of Engineering and Information Sciences - Papers: Part A

In the paper we present results of the research on polarization mode dispersion changes inside the polarimetric optical fiber sensors based on highly birefringent optical fibers embedded into composite materials with different angular orientations of the optical axes. Based on measurements made for different types of highly birefringent optical fiber sensors we have shown that strain sensitivities after lamination process are different in comparison to the data obtained before lamination. Our results indicate that polarization mode dispersion in side-hole highly birefringent fibers under axial stress strongly depends on fiber orientation in the composite material suggesting that orientation of the polarization ...


Novel Features Of Ars Selection In Budding Yeast Lachancea Kluyveri, Ivan Liachko, Emi Tanaka, Katherine A. Cox, Shau Chee C. Chung, Lu Yang, Arael Seher, Lindsay Hallas, Eugene Cha, Gina Kang, Heather Pace, Jasmine Barrow, Maki Inada, Bik Kwoon Tye, Uri Keich Jan 2011

Novel Features Of Ars Selection In Budding Yeast Lachancea Kluyveri, Ivan Liachko, Emi Tanaka, Katherine A. Cox, Shau Chee C. Chung, Lu Yang, Arael Seher, Lindsay Hallas, Eugene Cha, Gina Kang, Heather Pace, Jasmine Barrow, Maki Inada, Bik Kwoon Tye, Uri Keich

Faculty of Engineering and Information Sciences - Papers: Part A

Background: The characterization of DNA replication origins in yeast has shed much light on the mechanisms of initiation of DNA replication. However, very little is known about the evolution of origins or the evolution of mechanisms through which origins are recognized by the initiation machinery. This lack of understanding is largely due to the vast evolutionary distances between model organisms in which origins have been examined.Results: In this study we have isolated and characterized autonomously replicating sequences (ARSs) in Lachancea kluyveri - a pre-whole genome duplication (WGD) budding yeast. Through a combination of experimental work and rigorous computational analysis, we ...


Value Co-Creation With Customers Through Design Toolkits: The Importance Of Preference Fit And Psychological Ownership, Tingru Cui, Hua Ye, Hock Hai Teo Jan 2011

Value Co-Creation With Customers Through Design Toolkits: The Importance Of Preference Fit And Psychological Ownership, Tingru Cui, Hua Ye, Hock Hai Teo

Faculty of Engineering and Information Sciences - Papers: Part A

The information technologies increasingly enable companies to set up websites for customers to design and purchase their own individualized products. Although customer co-design offer benefits for both suppliers and customers, how to manage the co-design process, especially the central interface features of design toolkit have emerged as a contentious issue among researchers and practitioners. This paper focuses on the effects of both utilitarian and psychological customer-design product value (i.e., perceived preference fit and psychological ownership) on customers' purchase decision. Based on the self-determination theory, we propose that the effectiveness of the value increment mechanisms is influenced by three leading ...


Large Area Microfabrication Of Electroactive Polymeric Structures Based On Near-Field Electrospinning, R Lameiro, Vitor Sencadas, Senentxu Lanceros-Méndez, J H. Correia, P M. Mendes Jan 2011

Large Area Microfabrication Of Electroactive Polymeric Structures Based On Near-Field Electrospinning, R Lameiro, Vitor Sencadas, Senentxu Lanceros-Méndez, J H. Correia, P M. Mendes

Faculty of Engineering and Information Sciences - Papers: Part A

The use of electroactive polymeric materials for sensing and actuating applications is very attractive due to important properties like low operating voltage, low form factor, or high mechanical flexibility. However, its use has been conditioned by the lack of available processing methods for such materials. The deposition of thin layers is very easy by conventional techniques; however obtaining patterned layers is not a trivial task. This paper presents a methodology suitable to fabricate electroactive polymeric microstructures on large area devices. Structures ranging from ∼1, 5 mm to ∼100 μm width, with a thickness of ∼12 μm, were obtained.


Tailoring The Morphology And Crystallinity Of Poly(L-Lactide Acid) Electrospun Membranes, Clarisse Ribeiro, Vitor Sencadas, Carlos M. Costa, J L. Gomez Ribelles, Senentxu Lanceros-Méndez Jan 2011

Tailoring The Morphology And Crystallinity Of Poly(L-Lactide Acid) Electrospun Membranes, Clarisse Ribeiro, Vitor Sencadas, Carlos M. Costa, J L. Gomez Ribelles, Senentxu Lanceros-Méndez

Faculty of Engineering and Information Sciences - Papers: Part A

Biodegradable poly(L-lactic acid) (PLLA) microfibers were prepared by electrospinning by varying the applied potential, solution flow rate and collector conditions. PLLA fibers with smoothly oriented and random morphologies were obtained and characterized by scanning electron microscopy. The optimum fiber orientation was obtained at 1000 rpm using a 20.3 cm diameter collecting drum, while for higher and lower drum rotation speeds, the rapid random motion of the jets resulted in a random fiber distribution. The deformation of the jet with rapid solidification during electrospinning often results in a metastable phase. PLLA electrospun fibers are amorphous but contain numerous crystal ...


Effect Of The Carbon Nanotube Surface Characteristics On The Conductivity And Dielectric Constant Of Carbon Nanotube/Poly(Vinylidene Fluoride) Composites, S A. Carabineiro, Manuel F. Pereira, J Nunes-Pereira, Cristina Caparrós, Vitor Sencadas, Senentxu Lanceros-Méndez Jan 2011

Effect Of The Carbon Nanotube Surface Characteristics On The Conductivity And Dielectric Constant Of Carbon Nanotube/Poly(Vinylidene Fluoride) Composites, S A. Carabineiro, Manuel F. Pereira, J Nunes-Pereira, Cristina Caparrós, Vitor Sencadas, Senentxu Lanceros-Méndez

Faculty of Engineering and Information Sciences - Papers: Part A

Commercial multi-walled carbon nanotubes (CNT) were functionalized by oxidation with HNO3, to introduce oxygen-containing surface groups, and by thermal treatments at different temperatures for their selective removal. The obtained samples were characterized by adsorption of N2 at -196°C, temperature-programmed desorption and determination of pH at the point of zero charge. CNT/poly(vinylidene fluoride) composites were prepared using the above CNT samples, with different filler fractions up to 1 wt%. It was found that oxidation reduced composite conductivity for a given concentration, shifted the percolation threshold to higher concentrations, and had no significant effect in the dielectric response.


Multiplicity Of Solutions For Quasilinear Elliptic Equations With Critical Exponential Growth, Yanqin Fang, Jihui Zhang Jan 2011

Multiplicity Of Solutions For Quasilinear Elliptic Equations With Critical Exponential Growth, Yanqin Fang, Jihui Zhang

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper we consider a system of N-Laplacian elliptic equa- tions with critical exponential growth. The existence and multiplicity re- sults of solutions are obtained by a limit index method and Trudinger- Moser inequality.


Network Neighbor Effects On Customer Churn In Cell Phone Networks, Pavel N. Krivitsky, Pedro Ferreira, Rahul Telang Jan 2011

Network Neighbor Effects On Customer Churn In Cell Phone Networks, Pavel N. Krivitsky, Pedro Ferreira, Rahul Telang

Faculty of Engineering and Information Sciences - Papers: Part A

No abstract provided.


Statistical Requirements For Reporting Nutrition Research, Marijka Batterham Jan 2011

Statistical Requirements For Reporting Nutrition Research, Marijka Batterham

Faculty of Engineering and Information Sciences - Papers: Part A

No abstract provided.


A Singularity Free Trajectory Tracking Method For The Cooperative Working Of Multi-Arm Robots Using Screw Theory, Emre Sariyildiz, Hakan Temeltas Jan 2011

A Singularity Free Trajectory Tracking Method For The Cooperative Working Of Multi-Arm Robots Using Screw Theory, Emre Sariyildiz, Hakan Temeltas

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper we present a singularity free trajectory tracking method for the cooperative working of multi-arm robot manipulators. It is based on an inverse kinematic transformation which determines the manipulator's joint angles corresponding to the end-effector trajectory given in the task space. The kinematic problem of multi-arm robot system is solved by using screw theory and quaternion algebra. 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. Dual-quaternion is the most compact and efficient dual operator to express screw displacement. Inverse kinematic ...


A Comparison Study Of The Numerical Integration Methods In The Trajectory Tracking Application Of Redundant Robot Manipulators, Emre Sariyildiz, Hakan Temeltas Jan 2011

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 ...


Geotechnical Properties Of Reconstituted Dredged Mud, Dhanya Ganesalingam, Arul Arulrajah, Jayantha Ameratunga, Peter Boyle, Nagaratnam Sivakugan Jan 2011

Geotechnical Properties Of Reconstituted Dredged Mud, Dhanya Ganesalingam, Arul Arulrajah, Jayantha Ameratunga, Peter Boyle, Nagaratnam Sivakugan

Faculty of Engineering and Information Sciences - Papers: Part A

In the present study, laboratory tests were undertaken in order to assess the index properties and consolidation characteristics of dredged mud which is excavated during the maintenance dredging works carried out in Port of Brisbane, Queensland, Australia. These dredged spoils are reused as the fill materials in the major land reclamation project currently undertaken adjacent to the port for expanding the port facitlites. In the laboratory, index properties of dredged mud such as, particle size distuibution, Atterberg limits and specifc gravity were determined. Oedometer tests were conducted to calculate the consolidation properties of dredged mud. Laboratory resuls for consolidation properties ...


Methods For Generating Complex Networks With Selected Structural Properties For Simulations: A Review And Tutorial For Neuroscientists, Brenton Prettejohn, Matthew Berryman, Mark Mcdonnell Jan 2011

Methods For Generating Complex Networks With Selected Structural Properties For Simulations: A Review And Tutorial For Neuroscientists, Brenton Prettejohn, Matthew Berryman, Mark Mcdonnell

Faculty of Engineering and Information Sciences - Papers: Part A

Many simulations of networks in computational neuroscience assume completely homogenous random networks of the Erdös–Rényi type, or regular networks, despite it being recognized for some time that anatomical brain networks are more complex in their connectivity and can, for example, exhibit the “scale-free” and “small-world” properties. We review the most well known algorithms for constructing networks with given non-homogeneous statistical properties and provide simple pseudo-code for reproducing such networks in software simulations. We also review some useful mathematical results and approximations associated with the statistics that describe these network models, including degree distribution, average path length, and clustering coefficient ...


Concrete Digital Computation: What Does It Take For A Physical System To Compute?, Nir Fresco Jan 2011

Concrete Digital Computation: What Does It Take For A Physical System To Compute?, Nir Fresco

Faculty of Engineering and Information Sciences - Papers: Part A

This paper deals with the question: what are the key requirements for a physical system to perform digital computation? Time and again cognitive scientists are quick to employ the notion of computation simpliciter when asserting basically that cognitive activities are computational. They employ this notion as if there was or is a consensus on just what it takes for a physical system to perform computation, and in particular digital computation. Some cognitive scientists in referring to digital computation simply adhere to Turing's notion of computability. Classical computability theory studies what functions on the natural numbers are computable and what ...


Learning-Based Prostate Localization For Image Guided Radiation Therapy, Luping Zhou, Shu Liao, Wei Li, Dinggang Shen Jan 2011

Learning-Based Prostate Localization For Image Guided Radiation Therapy, Luping Zhou, Shu Liao, Wei Li, Dinggang Shen

Faculty of Engineering and Information Sciences - Papers: Part A

Accurate prostate localization is the key to the success of radiotherapy. It remains a difficult problem for CT images due to the low image contrast, the prostate motion, and the uncertain presence of rectum gas. In this paper, a learning based framework is proposed to improve the accuracy of prostate detection in CT. It adaptively determines distinctive feature types at distinctive image regions, thus filtering out features that are salient in image appearance, but irrelevant to prostate localization. Furthermore, an image similarity function is learned to make the image appearance distance consistent with the underlying prostate alignment. The efficacy of ...


Hierarchical Anatomical Brain Networks For Mci Prediction: Revisiting Volumetric Measures, Luping Zhou, Yaping Wang, Yang Li, Pew-Thian Yap, Dinggang Shen, Alzheimers Disease Neuroimaging Initiative (Adni) Jan 2011

Hierarchical Anatomical Brain Networks For Mci Prediction: Revisiting Volumetric Measures, Luping Zhou, Yaping Wang, Yang Li, Pew-Thian Yap, Dinggang Shen, Alzheimers Disease Neuroimaging Initiative (Adni)

Faculty of Engineering and Information Sciences - Papers: Part A

Owning to its clinical accessibility, T1-weighted MRI (Magnetic Resonance Imaging) has been extensively studied in the past decades for prediction of Alzheimer's disease (AD) and mild cognitive impairment (MCI). The volumes of gray matter (GM), white matter (WM) and cerebrospinal fluid (CSF) are the most commonly used measurements, resulting in many successful applications. It has been widely observed that disease-induced structural changes may not occur at isolated spots, but in several inter-related regions. Therefore, for better characterization of brain pathology, we propose in this paper a means to extract inter-regional correlation based features from local volumetric measurements. Specifically, our ...


The Work Pattern Of Care Workers In Residential Aged Care Facilities In Australia: A Time And Motion Study, Siyu Qian, Ping Yu, Zhenyu Zhang Jan 2011

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.


Can Australia High Speed Rail Overcome It's Bumpy History?, Philip Laird Jan 2011

Can Australia High Speed Rail Overcome It's Bumpy History?, Philip Laird

Faculty of Engineering and Information Sciences - Papers: Part A

The Australian Government has released an "implementation" study for high speed rail (or HSR) on the east coast with a further study to follow. The proposal looks at corridors between Melbourne, Sydney and Brisbane. It includes the option of three-hour travel times between Sydney and Melbourne, with tickets costing around $100. With the projected price of the project starting at around $60 billion, and Australia's chequered history with HSR, it is not unreasonable to ask whether the project will commence. In this case, would Sydney to Newcastle take preference over Sydney to Melbourne?


Cracking Bin Laden's Computer Code: Unlikely, Jennifer Seberry Jan 2011

Cracking Bin Laden's Computer Code: Unlikely, Jennifer Seberry

Faculty of Engineering and Information Sciences - Papers: Part A

It has been reported that Osama bin Laden's hard drives have been seized, hard drives that could conceivably contain information regarding the membership, funding and future plans of al-Qaeda. Information of this type would help anti-terrorism agencies enormously. The hard drives were recovered from bin Laden's compound in the Pakistani city of Abbottabad and are said to be encrypted with a encryption method known as AES-256. AES-256 is the current world standard for data encryption and is used by the likes of Wikileaks and the US Government to encrypt sensitive information.


On-Chip Stimulated Brillouin Scattering, Ravi Pant, Christopher Poulton, Duk-Yong Choi, Hannah Mcfarlane, Samuel Hile, Enbang Li, Luc Thevenaz, Barry Luther-Davies, Stephen J. Madden, Benjamin J. Eggleton Jan 2011

On-Chip Stimulated Brillouin Scattering, Ravi Pant, Christopher Poulton, Duk-Yong Choi, Hannah Mcfarlane, Samuel Hile, Enbang Li, Luc Thevenaz, Barry Luther-Davies, Stephen J. Madden, Benjamin J. Eggleton

Faculty of Engineering and Information Sciences - Papers: Part A

We demonstrate on-chip stimulated Brillouin scattering (SBS) in an As2S3 chalcogenide rib waveguide. SBS was characterized in a 7cm long waveguide with a cross-section 4μm x 850nm using the backscattered signal and pump-probe technique. The measured Brillouin shift and its full-width at half-maximum (FWHM) linewidth were ~7.7 GHz and 34 MHz, respectively. Probe vs. pump power measurements at the Brillouin shift were used to obtain the gain coefficient from an exponential fit. The Brillouin gain coefficient obtained was 0.715 x 10−9 m/W. A probe gain of 16 dB was obtained for a CW pump power of ...


Octave Spanning Supercontinuum In An As2s3 Taper Using Ultralow Pump Pulse Energy, Darren D. Hudson, Stephen A. Dekker, Eric C. Magi, Alexander C. Judge, Stuart D. Jackson, Enbang Li, J S. Sanghera, L B. Shaw, I D. Aggarwal, Benjamin J. Eggleton Jan 2011

Octave Spanning Supercontinuum In An As2s3 Taper Using Ultralow Pump Pulse Energy, Darren D. Hudson, Stephen A. Dekker, Eric C. Magi, Alexander C. Judge, Stuart D. Jackson, Enbang Li, J S. Sanghera, L B. Shaw, I D. Aggarwal, Benjamin J. Eggleton

Faculty of Engineering and Information Sciences - Papers: Part A

An octave spanning spectrum is generated in an As2S3 taper via 77 pJ pulses from an ultrafast fiber laser. Using a previously developed tapering method, we construct a 1.3 μm taper that has a zero-dispersion wavelength around 1.4 μm . The low two-photon absorption of sulfide-based chalcogenide fiber allows for higher input powers than previous efforts in selenium-based chalcogenide tapered fibers. This higher power handling capability combined with input pulse chirp compensation allows an octave spanning spectrum to be generated directly from the taper using the unamplified laser output.


Post-Weld Atmospheric Contamination Of Gas Tungsten Arc Deposited Welds In Commercially Pure And Ti-6al-4v Titanium Alloys, Nicholas Hoye, Huijun Li, John Norrish, Rian Dippenaar Jan 2011

Post-Weld Atmospheric Contamination Of Gas Tungsten Arc Deposited Welds In Commercially Pure And Ti-6al-4v Titanium Alloys, Nicholas Hoye, Huijun Li, John Norrish, Rian Dippenaar

Faculty of Engineering and Information Sciences - Papers: Part A

Titanium alloys are known to exhibit unique weldability issues, particularly atmospheric contamination from interstitial species such as oxygen. The prevention of such impurities from entering the weld region and surrounding heat affected zones is critical for engineering applications as these species are seen to dramatically alter the microstructure and so mechanical properties of the material. Of greatest concern is embrittlement of the weld region. During this study, the influence of inert shielding gas on atmospheric contamination by interstitial species, namely hydrogen, carbon, nitrogen and oxygen, was investigated as a function of post-weld gas shielding temperature. Gas tungsten arc welding (GTAW ...


Research To Establish A Systematic Approach To Safe Welding Procedure Development Using Austenitic Filler Material For Fabrication Of High Strength Steel, Lenka Kuzmikova, John Norrish, Huijun Li, Mark Callaghan Jan 2011

Research To Establish A Systematic Approach To Safe Welding Procedure Development Using Austenitic Filler Material For Fabrication Of High Strength Steel, Lenka Kuzmikova, John Norrish, Huijun Li, Mark Callaghan

Faculty of Engineering and Information Sciences - Papers: Part A

High strength, thermo-mechanically treated steels often require very careful control of welding procedures to ensure freedom from hydrogen assisted cold cracking (HACC) in the weld metal and heat affected zone (HAZ) whilst avoiding undue loss of heat affected zone strength. In practice this leads to restricted operating envelopes and the requirement for rigorous procedure management. An alternative approach is the use of austenitic welding consumables but whilst this may be expected to expand the process parameter envelope its use is often restricted by adherence to procedures previously developed for ferritic consumables. The current paper describes the research undertaken to establish ...


Mechanics Of Cold Rolling Of Thin Strip, Zhengyi Jiang Jan 2011

Mechanics Of Cold Rolling Of Thin Strip, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part A

Cold rolled thin strip has a wide application in electronic and instrument industries, and its production has always been of major interest to the manufacturers and researchers in the area of metal plasticity. Thin strip rolling involves significant metal plasticity to produce a desired product. Iwamoto (2004), Stoughton & Yoon (2004) and Hub et al. (2004) were interested in dealing with the plastic defonnation and plastic yielding of steel, and its micromechanics. With the need for higher quality and productivity in cold strip mill, mathematical models of cold rolling of a strip with a desired shape and dimension, both for mill ...


An Adaptive Design Approach For Geothermal Plant With Changing Resource Characteristics, M Imroz Sohel, Mathieu Sellier, Susan Krumdieck Jan 2011

An Adaptive Design Approach For Geothermal Plant With Changing Resource Characteristics, M Imroz Sohel, Mathieu Sellier, Susan Krumdieck

Faculty of Engineering and Information Sciences - Papers: Part A

Geothermal power plants are designed for optimal utilization of geothermal resource. However, geothermal fields typically undergo significant changes in resource characteristics such as pressure, temperature and steam quality over their life span. With appropriate reservoir modelling it is possible to predict the future resource characteristics of a geothermal field to a reasonable degree of accuracy. We propose a new adaptive design approach that would allow geothermal power plants to take into account the change of resource characteristics that occur over a 30-40 years time horizon based on the results of reservoir modelling. Currently, it is difficult and expensive to modify ...


Robust And Intelligent Control Methods To Improve The Performance Of A Unified Power Flow Controller, C Benachaiba, Ahmed M. Haidar, M L. Doumbia Jan 2011

Robust And Intelligent Control Methods To Improve The Performance Of A Unified Power Flow Controller, C Benachaiba, Ahmed M. Haidar, M L. Doumbia

Faculty of Engineering and Information Sciences - Papers: Part A

The important factor disturbing the modern power systems today is load flow control. The Unified Power Flow Controller (UPFC) is an effective way for controlling the power flow and can provide damping capability during transient conditions. The UPFC is controlled conventionally using PI controller. This paper presents two robust controllers to improve the performance of the UPFC. The first is a RST controller based on the principle of pole placement and the second is an intelligent controller based on the principle of fuzzy logic optimized by Genetic Algorithm (GA).