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2012

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Articles 301 - 330 of 8516

Full-Text Articles in Physical Sciences and Mathematics

On The Geometrıc Interpretatıons Of The Kleın-Gordon Equatıon And Solution Of The Equation By Homotopy Perturbation Method, Hasan Bulut, H. M. Başkonuş Dec 2012

On The Geometrıc Interpretatıons Of The Kleın-Gordon Equatıon And Solution Of The Equation By Homotopy Perturbation Method, Hasan Bulut, H. M. Başkonuş

Applications and Applied Mathematics: An International Journal (AAM)

This paper is organized in the following ways: In the first part, we obtained the Klein Gordon Equation (KGE) in the Galilean space. In the second part, we applied Homotopy Perturbation Method (HPM) to this differential equation. In the third part, we gave two examples for the Klein Gordon equation. Finally, We compared the numerical results of this differential equation with their exact results. We also showed that approach used is easy and highly accurate.

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An Approximate Analytical Algorithm For Solving The Multispecies Lotka-Volterra Equations, Abdolsaeed Alavi, Asghar Ghorbani Dec 2012

An Approximate Analytical Algorithm For Solving The Multispecies Lotka-Volterra Equations, Abdolsaeed Alavi, Asghar Ghorbani

Applications and Applied Mathematics: An International Journal (AAM)

In this paper, a new efficient method called the parametric iteration method (PIM) is applied to accurately solve the multispecies Lotka–Volterra equations (MLVEs). Some cases of MLVEs are highlighted in order to show the simplicity and efficiency of the method. The results obtained in this work demonstrate that the present algorithm is a powerful analytic tool for the solution of MLVEs.

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Two Reliable Methods For Solving The Modified Improved Kadomtsev-Petviashvili Equation, N. Taghizadeh, S. R. Moosavi Noori Dec 2012

Two Reliable Methods For Solving The Modified Improved Kadomtsev-Petviashvili Equation, N. Taghizadeh, S. R. Moosavi Noori

Applications and Applied Mathematics: An International Journal (AAM)

In this paper, the tanh-coth method and the extended (G'/G)-expansion method are used to construct exact solutions of the nonlinear Modified Improved Kadomtsev-Petviashvili (MIKP) equation. These methods transform nonlinear partial differential equation to ordinary differential equation and can be applied to nonintegrable equation as well as integrable ones. It has been shown that the two methods are direct, effective and can be used for many other nonlinear evolution equations in mathematical physics.

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A Constructive Proof Of Fundamental Theory For Fuzzy Variable Linear Programming Problems, A. Ebrahimnejad Dec 2012

A Constructive Proof Of Fundamental Theory For Fuzzy Variable Linear Programming Problems, A. Ebrahimnejad

Applications and Applied Mathematics: An International Journal (AAM)

Two existing methods for solving fuzzy variable linear programming problems based on ranking functions are the fuzzy primal simplex method proposed by Mahdavi-Amiri et al. (2009) and the fuzzy dual simplex method proposed by Mahdavi-Amiri and Nasseri (2007). In this paper, we prove that in the absence of degeneracy these fuzzy methods stop in a finite number of iterations. Moreover, we generalize the fundamental theorem of linear programming in a crisp environment to a fuzzy one. Finally, we illustrate our proof using a numerical example.

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Engaging The Community Through An Undergraduate Biomedical Physics Course, Grace Van Ness, Ralf Widenhorn Dec 2012

Engaging The Community Through An Undergraduate Biomedical Physics Course, Grace Van Ness, Ralf Widenhorn

Physics Faculty Publications and Presentations

We report on the development of an undergraduate biomedical physics course at Portland State University, motivated by both student interest and the desire of the university?s Physics Department to provide an interdisciplinary intermediate-level physics course. The course was developed through the community engagement of physicians, clinical researchers, and basic science researchers. Class meetings were a combination of regular and guest lectures, hands-on exercises, web-based activities, class discussions, and a student poster information session for patrons at a local science museum. The course inspired students to engage in research projects in biomedical physics that enhance their understanding of science and education …

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A Representation For Positive Functionals Of A Brownian Motion And An Application, P Sundar, Ming Tao Dec 2012

A Representation For Positive Functionals Of A Brownian Motion And An Application, P Sundar, Ming Tao

Communications on Stochastic Analysis

No abstract provided.

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Lattice Modules Over Rings Of Bounded Random Variables, Karl-Theodor Eisele, Sonia Taieb Dec 2012

Lattice Modules Over Rings Of Bounded Random Variables, Karl-Theodor Eisele, Sonia Taieb

Communications on Stochastic Analysis

No abstract provided.

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Spectral Multipliers For The Dunkl Laplacian, Sallam Hassani, Mohamed Sifi Dec 2012

Spectral Multipliers For The Dunkl Laplacian, Sallam Hassani, Mohamed Sifi

Communications on Stochastic Analysis

No abstract provided.

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Bose-Einstein Condensation: A Transition To Chaos Result, Stefania Ugolini Dec 2012

Bose-Einstein Condensation: A Transition To Chaos Result, Stefania Ugolini

Communications on Stochastic Analysis

No abstract provided.

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The Feynman Integrand For The Charged Particle In A Constant Magnetic Field As White Noise Distribution, Wolfgang Bock, Martin Grothaus, Sebastian Jung Dec 2012

The Feynman Integrand For The Charged Particle In A Constant Magnetic Field As White Noise Distribution, Wolfgang Bock, Martin Grothaus, Sebastian Jung

Communications on Stochastic Analysis

No abstract provided.

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Cauchy Problem And Integral Representation Associated To The Power Of The Qwn-Euler Operator, Aymen Ettaieb, Habib Ouerdiane, Hafedh Rguigui Dec 2012

Cauchy Problem And Integral Representation Associated To The Power Of The Qwn-Euler Operator, Aymen Ettaieb, Habib Ouerdiane, Hafedh Rguigui

Communications on Stochastic Analysis

No abstract provided.

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Generalized Field Operator Associated To The Fractional Lévy Processes, Mounir Dahwathi, Souheyl Jendoubi, Habib Ouerdiane, Anis Riahi Dec 2012

Generalized Field Operator Associated To The Fractional Lévy Processes, Mounir Dahwathi, Souheyl Jendoubi, Habib Ouerdiane, Anis Riahi

Communications on Stochastic Analysis

No abstract provided.

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Numerical Methods For Optimal Insurance Demand Under Marked Point Processes Shocks, Mohamed Mnif Dec 2012

Numerical Methods For Optimal Insurance Demand Under Marked Point Processes Shocks, Mohamed Mnif

Communications on Stochastic Analysis

No abstract provided.

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Impact Of Large Mammal Herbivory On The Federally Threatened Plant, Scutellaria Montana Chapm (Large-Flowered Skullcap) At A Millitary Training Site, Catoosa County, Georgia, Andrea Renee Benson Dec 2012

Impact Of Large Mammal Herbivory On The Federally Threatened Plant, Scutellaria Montana Chapm (Large-Flowered Skullcap) At A Millitary Training Site, Catoosa County, Georgia, Andrea Renee Benson

Masters Theses and Doctoral Dissertations

Scutellaria montana Chapm. (Large-flowered skullcap) is a federally listed species endemic to a few counties in northwestern Georgia and southeastern Tennessee. A large population of this species is housed within the Tennessee Army National Guard Volunteer Training Site (VTS) in Catoosa County, GA. To investigate the impacts of large mammal herbivores on this species at the VTS, an exclosure experiment was conducted in the field during 2011 and 2012. Results indicate that deer are not negatively impacting S. montana at the individual or population levels, but and after the second season, it was apparent that the white PVC pipe used …

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Volatile Memory Message Carving: A "Per Process Basis" Approach, Aisha Ibrahim Ali-Gombe Dec 2012

Volatile Memory Message Carving: A "Per Process Basis" Approach, Aisha Ibrahim Ali-Gombe

LSU New Orleans Theses and Dissertations

The pace at which data and information transfer and storage has shifted from PCs to mobile devices is of great concern to the digital forensics community. Android is fast becoming the operating system of choice for these hand-held devices, hence the need to develop better forensic techniques for data recovery cannot be over-emphasized. This thesis analyzes the volatile memory for Motorola Android devices with a shift from traditional physical memory extraction to carving residues of data on a “per process basis”. Each Android application runs in a separate process within its own Dalvik Virtual Machine (JVM) instance, thus, the proposed …

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Conservation Needs Of Nearshore Seabirds In The Southeastern U.S. Addressed Through Habitat Use Surveys And Assessments Of Health And Mercury Concentrations, Lisa Eggert Dec 2012

Conservation Needs Of Nearshore Seabirds In The Southeastern U.S. Addressed Through Habitat Use Surveys And Assessments Of Health And Mercury Concentrations, Lisa Eggert

All Dissertations

Seabirds encounter a range of natural and anthropogenic stressors in the nearshore environment and are ideal candidate species for long-term monitoring of changes to coastal systems. The mitigation of threats to nearshore seabirds requires management of essential coastal habitat and monitoring population health and trends. In this dissertation, I first evaluated intertidal habitat use for a suite of coastal species as it relates to management practices at a seabird nesting island in South Carolina. Specifically, my objectives were (1) to determine intertidal areas of high bird abundance, (2) to examine course-scale habitat characteristics and human use of intertidal areas associated …

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Effects Of Tracking Students In A Secondary Mathematics Classroom, Nicole Seyfried Dec 2012

Effects Of Tracking Students In A Secondary Mathematics Classroom, Nicole Seyfried

Mathematics Graduate Theses

This paper evaluates current research on the effect of grouping students of comparable abilities, a process known as tracking, in a secondary mathematics classroom. The research explores questions regarding the advantages and the disadvantages of tracking students by ability; the manner in which tracking affects the achievement of students in homogeneous and heterogeneous settings, and the ways tracking affects the achievement gap. In addition, this paper answers the question of how tracking affects students’ self- concept and self-esteem. Lastly, it examines changes in teacher attitude with respect to each track level and the impact of ability grouping on classroom structure …

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Aspects Of General Relativity In 1+1 Dimensions, Richard D. Mellinger Jr Dec 2012

Aspects Of General Relativity In 1+1 Dimensions, Richard D. Mellinger Jr

Physics

What would be the properties of a universe with only one spatial dimension and one time dimension? General relativity in 1+1 dimensions is unique since the two curvature terms in the Einstein field equations cancel. This makes the Einstein field equations algebraic rather than differential equations. This special feature can make 1+1 dimensionality attractive as an instructional tool to simplify the mathematics that many beginners find opaque. We explore the implications and features of the Einstein field equations in 1+1 dimensions and find they provide a surprisingly rich and interesting model. We then study an alternate theory and its implications …

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Building An Alpha Spectrometer For The Cuore Collaboration, David J. Miller Dec 2012

Building An Alpha Spectrometer For The Cuore Collaboration, David J. Miller

Physics

This paper will give the reader a brief introduction to the Standard Model, Neutrinoless Double Beta Decay (0νββ), and the CUORE experiment under construction at Gran Sasso National Lab in Assergi, Italy. The remainder of the paper will describe the process of creating a working alpha spectrometry system using silicon detectors and NIM and CAMAC electronics. Extensive details of the troubleshooting and calibration period are presented as a way for the reader to better understand the concepts involved in alpha spectroscopy and to not repeat mistakes made in this development process.

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Communication Of Recycling Through Labeling And Packaging, Serena Mistry Dec 2012

Communication Of Recycling Through Labeling And Packaging, Serena Mistry

Graphic Communication

Recycling has become a more prevalent practice in the last few decades. However, the labeling system on today’s packaging is not always clear in indicating whether something is recyclable. Recently, there has been a great deal of attention directed at a new system, known as the How2Recycle label, an innovative labeling system expected to launch in the next few years. As the population continues to grow at unprecedented levels and more strain is placed on the global environment, recycling becomes more crucial. In the United States, the lack of a standard system for recycling on labeling and packaging deters people …

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Preface Dec 2012

Preface

Communications on Stochastic Analysis

No abstract provided.

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Clark-Ocone Formula By The S-Transform On The Poisson White Noise Space, Yuh-Jia Lee, Nicolas Privault, Hsin-Hung Shih Dec 2012

Clark-Ocone Formula By The S-Transform On The Poisson White Noise Space, Yuh-Jia Lee, Nicolas Privault, Hsin-Hung Shih

Communications on Stochastic Analysis

No abstract provided.

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Lieb-Thirring Bound For Schrödinger Operators With Bernstein Functions Of The Laplacian, Fumio Hiroshima, József Lorinczi Dec 2012

Lieb-Thirring Bound For Schrödinger Operators With Bernstein Functions Of The Laplacian, Fumio Hiroshima, József Lorinczi

Communications on Stochastic Analysis

No abstract provided.

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Backward Stochastic Differential Equations With Respect To General Filtrations And Applications To Insider Finance, Bernt Øksendal, Tusheng Zhang Dec 2012

Backward Stochastic Differential Equations With Respect To General Filtrations And Applications To Insider Finance, Bernt Øksendal, Tusheng Zhang

Communications on Stochastic Analysis

No abstract provided.

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The Itô Formula For A New Stochastic Integral, Hui-Hsiung Kuo, Anuwat Sae-Tang, Benedykt Szozda Dec 2012

The Itô Formula For A New Stochastic Integral, Hui-Hsiung Kuo, Anuwat Sae-Tang, Benedykt Szozda

Communications on Stochastic Analysis

No abstract provided.

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Logistic Curves, Extraction Costs And Peak Oil, Robert J. Brecha Dec 2012

Logistic Curves, Extraction Costs And Peak Oil, Robert J. Brecha

Physics Faculty Publications

Debates about the possibility of a near-term maximum in world oil production have become increasingly prominent over the past decade, with the focus often being on the quantification of geologically available and technologically recoverable amounts of oil in the ground. Economically, the important parameter is not a physical limit to resources in the ground, but whether market price signals and costs of extraction will indicate the efficiency of extracting conventional or nonconventional resources as opposed to making substitutions over time for other fuels and technologies. We present a hybrid approach to the peak-oil question with two models in which the …

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Synergy And Its Limits In Managing Information Technology Professionals, Thomas W. Ferratt, Jayesh Prasad, Harvey Enns Dec 2012

Synergy And Its Limits In Managing Information Technology Professionals, Thomas W. Ferratt, Jayesh Prasad, Harvey Enns

MIS/OM/DS Faculty Publications

We examine the effects of human resource management (HRM) practices (e.g., career development, social support, compensation, and security) on IT professionals‟ job search behavior. Job search is a relatively novel dependent variable in studies of voluntary withdrawal behavior, in general, and for IT professionals, in particular. From a universalistic perspective, HRM practices individually and in combination exhibit independently additive effects on job search behavior. Our study contrasts this perspective with configurational theory, hypothesizing that proposed idealtype configurations of HRM practices have synergistic effects on job search behavior. We contribute to the IT and broader HRM literature by theoretically explicating and …

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Height And Light: Optical Profilometry Characterization For Conservation Of Abraded Plastics, Sarah Lavin Dec 2012

Height And Light: Optical Profilometry Characterization For Conservation Of Abraded Plastics, Sarah Lavin

Intersections Fall 2020

This project aims to understand how surface polishing affects different materials in the context of art conservation. These materials include both those used in the creation and preservation of art objects, and those used to house and display them in a museum. Conservators at SBE Conservation and Cooper Hewitt have been working on two series of art objects, Still Life #46 and Still Life #54 by Tom Wesselman, for the past 6 years. The two sculptures are identical with the difference being that those from the Still Life #46 series were backlit while the others were not. Working with conservators …

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Is The Fluorescence Quantum Yield Of Tryptophan Independent Of Excitation Wavelength?, Nadia Abbass, Luis A. Ortiz-Rodríguez, Carlos E. Crespo-Hernández Dec 2012

Is The Fluorescence Quantum Yield Of Tryptophan Independent Of Excitation Wavelength?, Nadia Abbass, Luis A. Ortiz-Rodríguez, Carlos E. Crespo-Hernández

Intersections Fall 2020

Tryptophan is a fluorescent amino acid that is commonly used as a probe in protein structure-dynamics studies. It is also widely used as a convenient standard for measurements of fluorescence quantum yields of organic and bioorganic molecules. Literature values of the fluorescence quantum yield range from 0.13 to 0.15 upon excitation of tryptophan at 270 nm in aqueous solution. Even though the fluorescence quantum yield of tryptophan is known with a high degree of accuracy upon excitation at 270 nm (i.e., ca. ± 0.02), this value is being used indiscriminately in the literature for the determination of the fluorescence quantum …

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Thermalization And Initial State-Recurrence In Discrete Kdv-Like Lattices, Garrett Taylor Nieddu Dec 2012

Thermalization And Initial State-Recurrence In Discrete Kdv-Like Lattices, Garrett Taylor Nieddu

Theses, Dissertations and Culminating Projects

Three discretizations of the Korteweg de-Vries equation are studied; convergence rate, initial state-recurrence, and the energy distribution of the three schemes are all considered. For each discrete scheme over 300 lattices with varying grid sizes were investigated, and the solutions were compared with other lattices from the same scheme, as well as solutions from the other two. It is found that the two schemes that are least accurate display the best recurrence at intermediate grid sizes, away from convergence. This is a notable result because the best recurrence is expected to be found in the most accurate, and converged lattices. …

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