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Physical Sciences and Mathematics Commons™

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2009

Selected Works

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Articles 31 - 60 of 405

Full-Text Articles in Physical Sciences and Mathematics

Nonlinear Optical Dynamics In Nonideal Gases Of Interacting Colloidal Nanoparticles, Ramy El-Ganainy, Demetrios N. Christodoulides, E. M. Wright, W. M. Lee, K. Dholakia Nov 2009

Nonlinear Optical Dynamics In Nonideal Gases Of Interacting Colloidal Nanoparticles, Ramy El-Ganainy, Demetrios N. Christodoulides, E. M. Wright, W. M. Lee, K. Dholakia

Ramy El-Ganainy

We show that many-body effects in stabilized nanocolloidal suspensions can have a profound effect on their optical nonlinearity. By considering the screened Coulomb repulsions between nanoparticles, we find that the nonlinear optical behavior of these colloids can range from polynomial to exponential depending on their composition and chemistry. The dynamics and stability properties of optical beams propagating in such nonideal gas environments of interacting colloidal particles are investigated. Our analysis provides a theoretical foundation for understanding the recently observed super-Kerr nonlinear optical response of such systems.

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Logically Rectangular Finite Volume Methods With Adaptive Refinement On The Sphere, Marsha Berger, Donna Calhoun, Christiane Helzel, Randall Leveque Oct 2009

Logically Rectangular Finite Volume Methods With Adaptive Refinement On The Sphere, Marsha Berger, Donna Calhoun, Christiane Helzel, Randall Leveque

Donna Calhoun

The logically rectangular finite volume grids for two-dimensional partial differential equations on a sphere and for three-dimensional problems in a spherical shell introduced recently have nearly uniform cell size, avoiding severe Courant number restrictions. We present recent results with adaptive mesh refinement using the GEOCLAW software and demonstrate well-balanced methods that exactly maintain equilibrium solutions, such as shallow water equations for an ocean at rest over arbitrary bathymetry.

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Conversion Of Vegetable And Algae Oils To Hydrocarbons Over Supported Metal Catalysts, T. Morgan, D. Grubb, E. Santillian-Jimenez, Samuel Morton, M. Crocker Oct 2009

Conversion Of Vegetable And Algae Oils To Hydrocarbons Over Supported Metal Catalysts, T. Morgan, D. Grubb, E. Santillian-Jimenez, Samuel Morton, M. Crocker

Samuel A Morton

No abstract provided.

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Measurements Of Electron Density, Temperature And Photoionization Cross Sections Of The Excited States Of Neon In A Discharge Plasma, Shaukat Mahmood, Nek Shaikh, M. Kalyar, Naveed Piracha, M. Baig Oct 2009

Measurements Of Electron Density, Temperature And Photoionization Cross Sections Of The Excited States Of Neon In A Discharge Plasma, Shaukat Mahmood, Nek Shaikh, M. Kalyar, Naveed Piracha, M. Baig

Naveed K. Piracha

In the present work emission and absorption spectroscopy have been used to determine the plasma parameters of neon in a hollow cathode discharge lamp. The excitation temperature is determined using the intensity ratio method and Boltzmann’s plot method whereas the electron density is determined from the Stark broadening of the spectral lines. The behavior of the optogalvanic signal as a function of laser energy has been studied for three transitions from the 2p53s [1/2]2 metastable state following ΔJ=ΔK=0, ±1 dipole selection rules. The saturation technique has been used to measure the photoionization cross section from three intermediate states 2p53p′ [1/2]1, …

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A Techno-Economic Analysis Of Carbon Dioxide Bio- Mitigation Using Microalgae, Samuel Morton Oct 2009

A Techno-Economic Analysis Of Carbon Dioxide Bio- Mitigation Using Microalgae, Samuel Morton

Samuel A Morton

No abstract provided.

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Green Buildings: An Asset Manager's Dream Or Nightmare?, Linda Too Oct 2009

Green Buildings: An Asset Manager's Dream Or Nightmare?, Linda Too

Linda Too

The mounting evidence on climate change has thrust the sustainability issue to the forefront of many political agendas. Current research has provided many business cases for sustainable design and construction. While commercial green buildings have been the mainstay, the green phenomenon has also spread to educational facilities. This paper provides a case study of the new Mirvac School of Sustainable Development Building at Bond University, Gold Coast, Australia. With its extensive green features, it is applying to be the first six-star rated green educational building in Australia. To this end, the management of green buildings will be a challenge for …

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Gauging The Impact Of Journals, Jerome K. Vanclay Oct 2009

Gauging The Impact Of Journals, Jerome K. Vanclay

Professor Jerome K Vanclay

Many stakeholders, including authors, editors, librarians and funding agencies, have an interest in reliable assessments of journal impact, but the provision of this service has long been dominated by a single service, the Journal Impact Factor (JIF; Garfield, 1955) provided by the ISI and Thomson Scientific. Despite several limitations (Hecht et al., 1998; Moed et al., 1999; van Leeuwen et al., 1999; Saha et al., 2003; Dong et al., 2005; Moed, 2005; Dellavalle et al., 2007), the JIF continues to be the dominant indicator of journal performance. Recently, Hirsch’s h-index (Hirsch, 2005; Bornmann and Daniel, 2007) has been suggested as …

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Indicator Groups And Faunal Richness, Jerome K. Vanclay Oct 2009

Indicator Groups And Faunal Richness, Jerome K. Vanclay

Professor Jerome K Vanclay

Species richness is a popular indicator of ecosystem vitality, but is difficult to assess. Many natural resource managers seek an efficient bioindicator, but the link between candidate indicators and the richness of other taxononic groups remains elusive. A series of faunal surveys in the Mbalmayo Forest Reserve in Cameroon suggest that it may be possible to devise faunal bioindicators. The species richness of birds, of butterflies and of termites is significantly correlated with total faunal richness across eight species groups, suggesting that these groups may have potential as bioindicators, alone or in combination. Although expensive, further research is warranted because …

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Site Index Equation For Smallholder Plantations Of Gmelina Arborea In Leyte Province, The Philippines, Jerome K. Vanclay, Jack Baynes, Edwin Cedamon Oct 2009

Site Index Equation For Smallholder Plantations Of Gmelina Arborea In Leyte Province, The Philippines, Jerome K. Vanclay, Jack Baynes, Edwin Cedamon

Professor Jerome K Vanclay

The equation SiteIndex = Height × Log(IndexYear+0.5) / Log(Age+0.5) is suggested as a robust way to classify site index of small private Gmelina arborea plantations in Leyte province in the Philippines. Estimates of site index from this equation correlate well with other indicators of site productivity, including the observed mean annual volume increment and soil depth. An alternative equation based on slope and soil depth offers an indication of potential site productivity on unforested sites where no crop trees are present.

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Managing Water Use From Forest Plantations, Jerome K. Vanclay Oct 2009

Managing Water Use From Forest Plantations, Jerome K. Vanclay

Professor Jerome K Vanclay

Tree plantations have developed a reputation for excessive water use, with age commonly used as an explanatory variable to predict water loss – but many factors have the potential to affect plantation water use, and few of these alternatives have been considered. Changes in forest cover may be correlated with other environmental changes that may affect precipitation, transpiration, and runoff, indicating that more thorough investigation is required in both field and simulation studies. Several factors influencing water use by plantations are amenable to management control, so there is scope to design and manage forest plantations deliberately for water use efficiency. …

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M.G. Michael And K. Michael (2009). "Uberveillance: Definition" In Ed. S. Butler, Fifth Edition Of The Macquarie Dictionary (Australia's National Dictionary, Sydney University), P. 1094, Susan Butler, M.G. Michael, K. Michael Oct 2009

M.G. Michael And K. Michael (2009). "Uberveillance: Definition" In Ed. S. Butler, Fifth Edition Of The Macquarie Dictionary (Australia's National Dictionary, Sydney University), P. 1094, Susan Butler, M.G. Michael, K. Michael

Professor Katina Michael

No abstract provided.

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Designing Short Term Trading Systems With Artificial Neural Networks, Bruce Vanstone, Gavin Finnie, Tobias Hahn Oct 2009

Designing Short Term Trading Systems With Artificial Neural Networks, Bruce Vanstone, Gavin Finnie, Tobias Hahn

Tobias Hahn

There is a long established history of applying Artificial Neural Networks (ANNs) to financial data sets. In this paper, the authors demonstrate the use of this methodology to develop a financially viable, short-term trading system. When developing short-term systems, the authors typically site the neural network within an already existing non-neural trading system. This paper briefly reviews an existing medium-term long-only trading system, and then works through the Vanstone and Finnie methodology to create a short-term focused ANN which will enhance this trading strategy. The initial trading strategy and the ANN enhanced trading strategy are comprehensively benchmarked both in-sample and …

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An Ontology For Autonomic License Management, Qian Zhao, Mark Perry Oct 2009

An Ontology For Autonomic License Management, Qian Zhao, Mark Perry

Mark Perry

The license agreement can be seen as the knowledge source for a license management system. As such, it may be referenced by the system each time a new process is initiated. To facilitate access, a machine readable representation of the license agreement is highly desirable, but at the same time we do not want to sacrifice too much readability of such agreements by human beings. Creating an ontology as a formal knowledge representation of licensing not only meets the representation requirements, but also offers improvements to knowledge reusability owing to the inherent sharing nature of such representations. Furthermore, the XML-based …

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A Framework For Automatic Sla Creation, Halina Kaminski, Mark Perry Oct 2009

A Framework For Automatic Sla Creation, Halina Kaminski, Mark Perry

Mark Perry

Negotiation is fundamental to business. Increased automation of business to business or business to customer interaction is demanding efficient but flexible systems that can manage the negotiation process with minimal direct human intervention. Industries that provide online services rely on Service Level Agreements as the basis for their contractual relationship. Here we look at a means for generating these with a negotiating tool (SLA Negotiation Manager) that complies with e-negotiation rules and creates the agreements from existing business objectives.

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Policy Driven Licensing Model For Component Software, Zhao Qian, Zhou Yu, Mark Perry Oct 2009

Policy Driven Licensing Model For Component Software, Zhao Qian, Zhou Yu, Mark Perry

Mark Perry

Today, it is almost inevitable that software is licensed, rather than sold outright. As a part of the licensing policy, some protection mechanisms, whether hardware, legal or code-based, are invariably built into the license. The application of such mechanisms has primarily been in the realm of off-the-shelf, packaged, consumer software. However, as component-based software gradually becomes mainstream in software development, new component-oriented licensing systems are required. This paper proposes an enterprise component licensing model for the management of software component licenses. The model provides a comprehensive license management framework allowing for extensibility and flexibility. Furthermore, we identify differences between stand-alone …

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Counting Pattern-Avoiding Permutations, Lara Pudwell Oct 2009

Counting Pattern-Avoiding Permutations, Lara Pudwell

Lara K. Pudwell

No abstract provided.

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One Million Downloads For Uow’S Research Online, Kate Mcilwain, Michael Organ, K. Michael, M. Michael Oct 2009

One Million Downloads For Uow’S Research Online, Kate Mcilwain, Michael Organ, K. Michael, M. Michael

Michael Organ

No abstract provided.

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Zincast-1: A Photochemically Active Chelator For Zn2+, Shawn Burdette, Celina Gwizdala, Daniel Kennedy Oct 2009

Zincast-1: A Photochemically Active Chelator For Zn2+, Shawn Burdette, Celina Gwizdala, Daniel Kennedy

Shawn C. Burdette

Two strategies were applied to the synthesis of ZinCast-1, a nitrobenzhydrol-based caged complex that upon photolysis exhibits a nearly 400-fold difference in binding for Zn2+.

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Experimental And Theoretical Study Of The Structures And Enthalpies Of Formation Of The Synthetic Reagents 1,3-Thiazolidine-2-Thione And 1,3-Oxazolidine-2-Thione., María Victoria Roux, Manuel Temprado, Pilar Jiménez, Concepción Foces-Foces, Rafael Notario, Archana R. Parameswar, Alexei V. Demchenko, James S. Chickos, Carol A. Deakyne, Alicia K. Ludden, Joel F. Liebman Oct 2009

Experimental And Theoretical Study Of The Structures And Enthalpies Of Formation Of The Synthetic Reagents 1,3-Thiazolidine-2-Thione And 1,3-Oxazolidine-2-Thione., María Victoria Roux, Manuel Temprado, Pilar Jiménez, Concepción Foces-Foces, Rafael Notario, Archana R. Parameswar, Alexei V. Demchenko, James S. Chickos, Carol A. Deakyne, Alicia K. Ludden, Joel F. Liebman

James Chickos

No abstract provided.

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Absolute Nitrogen Atom Density Measurements By Two-Photon Laser-Induced Fluorescence Spectroscopy In Atmospheric Pressure Dielectric Barrier Discharges Of Pure Nitrogen, Et-Touhami Es-Sebbar, Christian Sarra-Bournet, Nicolas Naudé, Françoise Massines, Nicolas Gherardi Oct 2009

Absolute Nitrogen Atom Density Measurements By Two-Photon Laser-Induced Fluorescence Spectroscopy In Atmospheric Pressure Dielectric Barrier Discharges Of Pure Nitrogen, Et-Touhami Es-Sebbar, Christian Sarra-Bournet, Nicolas Naudé, Françoise Massines, Nicolas Gherardi

Dr. Et-touhami Es-sebbar

In this paper, two-photon absorption laser induced fluorescence spectroscopy is used to follow the nitrogen atom density in flowing dielectric barrier discharges fed with pure nitrogen and operating at atmospheric pressure. Two different dielectric barrier discharge regimes are investigated: the Townsend regime, which is homogeneous although operating at atmospheric pressure, and the more common filamentary regime. In both regimes, densities as high as 3x1014 /cm3 are detected. However, the N atoms kinetic formation depends on the discharge regime. The saturation level is reached more rapidly with a filamentary discharge. For a given discharge regime, the N atom density depends strongly …

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Contributions To The Development Of The S.E.T.U.P. (Experimental And Theoretical Simulations Useful For Planetology) Project, E. Arzoumanian, C. Romanzin, M-C. Gazeau, Et. Es-Sebbar, A. Jolly, S. Perrier, Y. Benilan Oct 2009

Contributions To The Development Of The S.E.T.U.P. (Experimental And Theoretical Simulations Useful For Planetology) Project, E. Arzoumanian, C. Romanzin, M-C. Gazeau, Et. Es-Sebbar, A. Jolly, S. Perrier, Y. Benilan

Dr. Et-touhami Es-sebbar

No abstract provided.

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Multiwavelength Studies For Titan's Atmospheric Composition Analysis, Y. Benilan, Et. Es-Sebbar, N. Fray, M-C. Gazeau, A. Jolly, M. Schwell, J. Guillemin Oct 2009

Multiwavelength Studies For Titan's Atmospheric Composition Analysis, Y. Benilan, Et. Es-Sebbar, N. Fray, M-C. Gazeau, A. Jolly, M. Schwell, J. Guillemin

Dr. Et-touhami Es-sebbar

Titan's atmosphere mainly made of nitrogen and methane is rich in organic molecules. Hydrocarbons are formed from the photolytic dissociation of CH4 and nitriles are created by dissociation of N2 followed by reactions with hydrocarbons. In order to understand the physicochemical mechanisms responsible for the evolution of Titan's atmosphere, photochemical models are built. The latter need constrains for vertical profiles of organic compounds from the high thermosphere down to the low stratosphere as well as photodissociation rates. Those profiles over the entire atmosphere can be retrieved from Cassini observations, in particular by limb sounding, coupling infrared and ultraviolet spectroscopy. However, …

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Non-Smooth Solutions To Least Squares Problems, Jodi Mead Sep 2009

Non-Smooth Solutions To Least Squares Problems, Jodi Mead

Jodi Mead

In an attempt to overcome the ill-posedness or illconditioning of inverse problems, regularization methods are implemented by introducing assumptions on the solution. Common regularization methods include total variation, L-curve, Generalized Cross Validation (GCV), and the discrepancy principle. It is generally accepted that all of these approaches except total variation unnecessarily smooth solutions, mainly because the regularization operator is in an L2 norm. Alternatively, statistical approaches to ill-posed problems typically involve specifying a priori information about the parameters in the form of Bayesian inference. These approaches can be more accurate than typical regularization methods because the regularization term is weighted with …

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An Aztec 1.1mm Survey Of The Goods-N Field – Ii. Multiwavelength Identifications And Redshift Distribution, Thushara Perera, Edward Chapin, Alexandra Pope, Douglas Scott, Itziar Aretxaga, Jason Austermann, Ranga-Ram Chary, Kristen Coppin, Mark Halpern, David Hughes, James Lowenthal, Glenn Morrison, Kimberly Scott, Grant Wilson, Min Yun Sep 2009

An Aztec 1.1mm Survey Of The Goods-N Field – Ii. Multiwavelength Identifications And Redshift Distribution, Thushara Perera, Edward Chapin, Alexandra Pope, Douglas Scott, Itziar Aretxaga, Jason Austermann, Ranga-Ram Chary, Kristen Coppin, Mark Halpern, David Hughes, James Lowenthal, Glenn Morrison, Kimberly Scott, Grant Wilson, Min Yun

Thushara A. Perera

No abstract provided.

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Copula Density Estimation By Total Variation Penalized Likelihood, Leming Qu, Yi Qian, Hui Xie Sep 2009

Copula Density Estimation By Total Variation Penalized Likelihood, Leming Qu, Yi Qian, Hui Xie

Leming Qu

Copulas are full measures of dependence among random variables. They are increasingly popular among academics and practitioners in financial econometrics for modeling comovements between markets, risk factors, and other relevant variables. A copula's hidden dependence structure that couples a joint distribution with its marginals makes a parametric copula non-trivial. An approach to bivariate copula density estimation is introduced that is based on a penalized likelihood with a total variation penalty term. Adaptive choice of the amount of regularization is based on approximate Bayesian Information Criterion (BIC) type scores. Performance are evaluated through the Monte Carlo simulation.

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Problem #3468, Stan Wagon, Peter Saltzman, Joseph Devincentis Sep 2009

Problem #3468, Stan Wagon, Peter Saltzman, Joseph Devincentis

Stan Wagon, Retired

No abstract provided.

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An Integrated Service Model Approach For Enabling Soa, Liang-Jie Zhang, Jia Zhang Sep 2009

An Integrated Service Model Approach For Enabling Soa, Liang-Jie Zhang, Jia Zhang

Jia Zhang

No abstract provided.

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Open & Mobile Equipment, Timothy J. Rowley Sep 2009

Open & Mobile Equipment, Timothy J. Rowley

Timothy J Rowley

This was a "Lightning Presentation" about making cutting edge technology available to university students.

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A Pair Of Operator Summation Formulas And Their Applications, Tian-Xiao He, Leetsch C. Hsu, Dongsheng Yin Sep 2009

A Pair Of Operator Summation Formulas And Their Applications, Tian-Xiao He, Leetsch C. Hsu, Dongsheng Yin

Tian-Xiao He

Two types of symbolic summation formulas are reformulated using an extension of Mullin–Rota’s substitution rule in [R. Mullin, G.-C. Rota, On the foundations of combinatorial theory: III. Theory of binomial enumeration, in: B. Harris (Ed.), Graph Theory and its Applications, Academic Press, New York, London, 1970, pp. 167–213], and several applications involving various special formulas and identities are presented as illustrative examples.

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Student Staff: A Village Philosophy, Lisa Caughron Sep 2009

Student Staff: A Village Philosophy, Lisa Caughron

Lisa Caughron

No abstract provided.

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