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2009

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Articles 1651 - 1680 of 7616

Full-Text Articles in Physical Sciences and Mathematics

Local Time For Gaussian Processes As An Element Of Sobolev Space, Alexey Rudenko Aug 2009

Local Time For Gaussian Processes As An Element Of Sobolev Space, Alexey Rudenko

Communications on Stochastic Analysis

No abstract provided.

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Generating Functions Of Jacobi Polynomials, Izumi Kubo Aug 2009

Generating Functions Of Jacobi Polynomials, Izumi Kubo

Communications on Stochastic Analysis

No abstract provided.

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Unbounded Positive Solutions Of Nonlinear Parabolic Itô Equations, Pao-Liu Chow Aug 2009

Unbounded Positive Solutions Of Nonlinear Parabolic Itô Equations, Pao-Liu Chow

Communications on Stochastic Analysis

No abstract provided.

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Representations Of The Gegenbauer Oscillator Algebra And The Overcompleteness Of Sequences Of Nonlinear Coherent States, Abdessatar Barhoumi Aug 2009

Representations Of The Gegenbauer Oscillator Algebra And The Overcompleteness Of Sequences Of Nonlinear Coherent States, Abdessatar Barhoumi

Communications on Stochastic Analysis

No abstract provided.

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Markovian Properties Of The Pauli-Fierz Model, Ameur Dhahri Aug 2009

Markovian Properties Of The Pauli-Fierz Model, Ameur Dhahri

Communications on Stochastic Analysis

No abstract provided.

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Summer/Fall 2009, Nsu Oceanographic Center Aug 2009

Summer/Fall 2009, Nsu Oceanographic Center

Currents

No abstract provided.

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Sfa Weather Station-August 2009, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University Aug 2009

Sfa Weather Station-August 2009, Arthur Temple College Of Forestry And Agriculture, Stephen F. Austin State University

Weather Station Data

No abstract provided.

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Magnetoelectric Effect At The Srruo3/Batio3 (001) Interface: An Ab Initio Study, Manish K. Niranjan, John D. Burton, Julian P. Velev, Sitaram Jaswal, Evgeny Y. Tsymbal Aug 2009

Magnetoelectric Effect At The Srruo3/Batio3 (001) Interface: An Ab Initio Study, Manish K. Niranjan, John D. Burton, Julian P. Velev, Sitaram Jaswal, Evgeny Y. Tsymbal

Evgeny Tsymbal Publications

Ferromagnet/ferroelectric interface materials have emerged as structures with strong magnetoelectric coupling that may exist due to unconventional physical mechanisms. Here we present a first-principles study of the magnetoelectric effect at the ferromagnet/ferroelectric SrRuO3 /BaTiO3 (001) interface. We find that the exchange splitting of the spin-polarized band structure, and therefore the magnetization, at the interface can be altered substantially by reversal of the ferroelectric polarization in the BaTiO3. These magnetoelectric effects originate from the screening of polarization charges at the SrRuO3 /BaTiO3 interface and are consistent with the Stoner model for itinerant magnetism.

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From The Editor, James Manasco Aug 2009

From The Editor, James Manasco

Sci-Tech News

No abstract provided.

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Alignment Update, Gloria Zamora Aug 2009

Alignment Update, Gloria Zamora

Sci-Tech News

A report from SLA's President on progress with the Association's ongoing attempt to understand the changing environment of the information profession, and how it affects our Association.

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Continuing Education Webinar: Toxnet And Beyond Aug 2009

Continuing Education Webinar: Toxnet And Beyond

Sci-Tech News

No abstract provided.

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Safety Intelligence And Legal Machine Language: Do We Need Three Laws Of Robotics?, Chien Hsun Chen, Y. H. Weng, C. T. Sun Aug 2009

Safety Intelligence And Legal Machine Language: Do We Need Three Laws Of Robotics?, Chien Hsun Chen, Y. H. Weng, C. T. Sun

Chien Hsun Chen

In this chapter we will describe a legal framework for Next Generation Robots (NGRs) that has safety as its central focus. The framework is offered in response to the current lack of clarity regarding robot safety guidelines, despite the development and impending release of tens of thousands of robots into workplaces and homes around the world. We also describe our proposal for a safety intelligence (SI) concept that addresses issues associated with open texture risk for robots that will have a relatively high level of autonomy in their interactions with humans. Whereas Isaac Asimov’s Three Laws of Robotics are frequently …

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Diels−Alder Cycloaddition Strategy For Kinetic Resolution Of Chiral Pyrazolidinones, Mukund P. Sibi, Keisuke Kawashima, Levi M. Stanley Aug 2009

Diels−Alder Cycloaddition Strategy For Kinetic Resolution Of Chiral Pyrazolidinones, Mukund P. Sibi, Keisuke Kawashima, Levi M. Stanley

Levi M. Stanley

A rare example of the application of a catalytic, enantioselective Diels−Alder cycloaddition to affect a kinetic resolution has been developed. Chiral pyrazolidinones are resolved with high selectivity through a process that utilizes a relay of stereochemical information from a permanent chiral center to a fluxional chiral center to enhance the inherent selectivity of the chiral Lewis acid catalyst.

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An Empirical Investigation Of Filter Attribute Selection Techniques For Software Quality Classification, Kehan Gao, Taghi M. Khoshgoftaar, Huanjing Wang Aug 2009

An Empirical Investigation Of Filter Attribute Selection Techniques For Software Quality Classification, Kehan Gao, Taghi M. Khoshgoftaar, Huanjing Wang

Dr. Huanjing Wang

Attribute selection is an important activity in data preprocessing for software quality modeling and other data mining problems. The software quality models have been used to improve the fault detection process. Finding faulty components in a software system during early stages of software development process can lead to a more reliable final product and can reduce development and maintenance costs. It has been shown in some studies that prediction accuracy of the models improves when irrelevant and redundant features are removed from the original data set. In this study, we investigated four filter attribute selection techniques, Automatic Hybrid Search (AHS), …

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A Switch In Retrograde Signaling From Survival To Stress In Rapid Onset Neurodegeneration, Jennifer Ross, Erika L.F Holzbaur, Robert G. Kalb, Karen E. Wallace, Ram Dixit, Goo-Bo Jeong, Eran Perlson Aug 2009

A Switch In Retrograde Signaling From Survival To Stress In Rapid Onset Neurodegeneration, Jennifer Ross, Erika L.F Holzbaur, Robert G. Kalb, Karen E. Wallace, Ram Dixit, Goo-Bo Jeong, Eran Perlson

Jennifer Ross

Retrograde axonal transport of cellular signals driven by dynein is vital for neuronal survival. Mouse models with defects in the retrograde transport machinery, including the Loa mouse (point mutation in dynein) and the Tgdynamitin mouse (overexpression of dynamitin), exhibit mild neurodegenerative disease. Transport defects have also been observed in more rapidly progressive neurodegeneration, such as that observed in the SOD1G93A transgenic mouse model for familial amyotrophic lateral sclerosis (ALS). Here, we test the hypothesis that alterations in retrograde signaling lead to neurodegeneration. In vivo, in vitro, and live-cell imaging motility assays show misregulation of transport and inhibition of retrograde signaling …

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An Economical Model With Allee Effect, Rafael Luís, Saber Elaydi, Henrique Oliveira Aug 2009

An Economical Model With Allee Effect, Rafael Luís, Saber Elaydi, Henrique Oliveira

Mathematics Faculty Research

The Marx model for the profit rate r depending on the exploitation rate e and on the organic composition of the capital k is studied using a dynamical approach. Supposing both e(t) and k(t) are continuous functions of time we derive a law for r(t) in the long term. Depending upon the hypothesis set on the growth of k(t) and e(t) in the long term, r(t) can fall to zero or remain constant. This last case contradicts the classical hypothesis of Marx …

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Rogers-Ramanujan Computer Searches, James Mclaughlin, Andrew Sills, Peter Zimmer Aug 2009

Rogers-Ramanujan Computer Searches, James Mclaughlin, Andrew Sills, Peter Zimmer

Department of Mathematical Sciences Faculty Publications

We describe three computer searches (in PARI/GP, Maple, and Mathematica, respectively) which led to the discovery of a number of identities of Rogers–Ramanujan type and identities of false theta functions.

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Indiana Wildlife Disease News, Vol 4, Issue 3 -- August 2009, Joe N. Caudill, Dean Zimmerman Aug 2009

Indiana Wildlife Disease News, Vol 4, Issue 3 -- August 2009, Joe N. Caudill, Dean Zimmerman

Indiana Wildlife Disease News

White-nose syndrome in bats
Indiana DNR Protocol for Dead Bats
ProMED-mail - the Program for Monitoring Emerging Diseases
14th International Congress on Infectious Diseases
Bird Banders are Invited to Participate in a Research Study
Meetings Planned to Discuss Bovine TB
Mark Reiter to Lead DNR Fish and Wildlife Division
Midwest Wildlife Disease Update: Epizootic Hemorrhagic Disease Wide Spread In 2007; Rate of Chronic Wasting Disease Up in Wisconsin Deer; Anaplasmosis- A New Tick Disease Surfaces In WI; Susceptibilities of Nonhuman Primates to Chronic Wasting Disease;

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Semantic And Visual Encoding Of Diagrams, Gabriel A. Weaver Aug 2009

Semantic And Visual Encoding Of Diagrams, Gabriel A. Weaver

Computer Science Technical Reports

Constructed geometric diagrams capture a dynamic relationship between text and image that played a central role in ancient science and mathematics. Euclid, Theodosius, Ptolemy, Archimedes and others constructed diagrams to geometrically model optics, astronomy, cartography, and hydrostatics. Each derived geometric properties from their models and interpreted their results with respect to the model's underlying semantics. Although diagram construction is a dynamic process, the media in which these works were published (manuscripts and books) forced scholars to either view a snapshot of that process (a static image) or manually perform the entire construction. Mainstream approaches to digitization represent constructed diagrams as …

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A Clustering Approach For Optimizing Beam Angles In Imrt Planning, Gino J. Lim, Allen Holder, Josh Reese Aug 2009

A Clustering Approach For Optimizing Beam Angles In Imrt Planning, Gino J. Lim, Allen Holder, Josh Reese

Mathematical Sciences Technical Reports (MSTR)

In this paper we introduce a p-median problem based clustering heuristic for selecting efficient beam angles for intensity-modulated radiation therapy. The essence of the method described here is the clustering of beam angles according to probability that an angle will be observed in the final solution and similarities among different angles and the selection of a representative angle from each of the p resulting cluster cells. We conduct experiments using several combinations of modeling parameters to find the conditions where the heuristic best performs. We found a combination of such parameters that outperformed all other parameters on three of the …

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Rephasing Ion Packets In The Orbitrap Mass Analyzer To Improve Resolution And Peak Shape, Richard H. Perry, Qizhi Hu, Gary A. Salazar, R. Graham Cooks, Robert J. Noll Aug 2009

Rephasing Ion Packets In The Orbitrap Mass Analyzer To Improve Resolution And Peak Shape, Richard H. Perry, Qizhi Hu, Gary A. Salazar, R. Graham Cooks, Robert J. Noll

Chemistry and Physics Faculty Articles

A method is described to improve resolution and peak shape in the Orbitrap under certain experimental conditions. In these experiments, an asymmetric anharmonic axial potential was first produced in the Orbitrap by detuning the voltage on the compensator electrode, which results in broad and multiply split mass spectral peaks. An AC waveform applied to the outer electrode, 180° out of phase with ion axial motion and resonant with the frequency of ion axial motion, caused ions of a given m/z to be de-excited to the equator (z = 0) and then immediately re-excited. This process, termed “rephasing,” leaves the …

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Some Implications Of The Wp-Bailey Tree, James Mclaughlin, Peter Zimmer Aug 2009

Some Implications Of The Wp-Bailey Tree, James Mclaughlin, Peter Zimmer

Mathematics Faculty Publications

We consider a special case of a WP-Bailey chain of George Andrews, and use it to derive a number of curious transformations of basic hypergeometric series. We also derive two new WP-Bailey pairs, and use them to derive some new transformations for basic hypergeometric series. Finally, we briefly consider the implications of WP-Bailey pairs (αn(a, k), βn(a, k)), in which αn(a, k) is independent of k, for generalizations of identities of the Rogers-Ramanujan type.

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Continuous Profiles Of Electromagnetic Wave Velocity And Water Content In Glaciers: An Example From Bench Glacier, Alaska, Usa, John H. Bradford, Joshua Nichols, T. Dylan Mikesell, Joel T. Harper Aug 2009

Continuous Profiles Of Electromagnetic Wave Velocity And Water Content In Glaciers: An Example From Bench Glacier, Alaska, Usa, John H. Bradford, Joshua Nichols, T. Dylan Mikesell, Joel T. Harper

Geosciences Faculty Publications

We conducted two-dimensional continuous multi-offset georadar surveys on Bench Glacier, south-central Alaska, USA, to measure the distribution of englacial water. We acquired data with a multi channel 25 MHz radar system using transmitter-receiver offsets ranging from 5 to 150 m. We towed the radar system at 5-10 kmh-1 with a snow machine with transmitter/receiver positions established by geodetic-grade kinematic deferentially corrected GPS (nominal 0.5 m trace spacing). For radar velocity analyses, we employed reflection tomography in the pre-stack depth-migrated domain to attain an estimated 2% velocity uncertainty when averaged over three to five wavelengths. We estimated water content from …

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Sci-Tech Candidates For Chair-Elect And Secretary, Ann E. Koopman Aug 2009

Sci-Tech Candidates For Chair-Elect And Secretary, Ann E. Koopman

Sci-Tech News

No abstract provided.

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Factoring Polynomials And Groebner Bases, Genhua (Yinhua) Guan Aug 2009

Factoring Polynomials And Groebner Bases, Genhua (Yinhua) Guan

All Dissertations

Factoring polynomials is a central problem in computational algebra and number theory and is a basic routine in most
computer algebra systems (e.g. Maple, Mathematica, Magma, etc). It has been extensively studied
in the last few decades by many mathematicians and computer scientists. The main approaches include Berlekamp's method
(1967) based on the kernel of Frobenius map, Niederreiter's method (1993) via an ordinary differential equation,
Zassenhaus's modular approach (1969), Lenstra, Lenstra and Lovasz's lattice reduction (1982), and Gao's method via a partial differential equation (2003). These methods and their recent improvements due to van Hoeij (2002) and
Lecerf et al …

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A Study Of Client-Based Caching For Parallel I/O, Bradley Settlemyer Aug 2009

A Study Of Client-Based Caching For Parallel I/O, Bradley Settlemyer

All Dissertations

The trend in parallel computing toward large-scale cluster computers running thousands of cooperating processes per application has led to an I/O bottleneck that has only gotten more severe as the the number of processing cores per CPU has increased. Current parallel file systems are able to provide high bandwidth file access for large contiguous file region accesses; however, applications repeatedly accessing small file regions on unaligned file region boundaries continue to experience poor I/O throughput due to the high overhead associated with accessing parallel file system data.
In this dissertation we demonstrate how client-side file data caching can improve parallel …

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Hydrothermal Crystal Growth Of Tetravalent And Pentavalent Metal Oxides, James Mann Aug 2009

Hydrothermal Crystal Growth Of Tetravalent And Pentavalent Metal Oxides, James Mann

All Dissertations

Over the past two hundred years synthetic growth of crystals has become vital to the technological advancement of our society. A variety of crystal growth techniques have been developed during this time, with each having its own nuances. These differences have enabled the growth of a wide spectrum of crystalline materials that can be used for many applications which include solid state lasers, semiconductors, and communication devices. Despite these techniques there are entire classes of materials which have thus far proved quite difficult to prepare as single crystals. In particular, crystal growth of the tetravalent and pentavalent metal oxides has …

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Synthesis And Characterization Of Magnetic Solids Containing Periodic Arrays Of Transition Metal Oxide Nanostructures, Wendy Queen Aug 2009

Synthesis And Characterization Of Magnetic Solids Containing Periodic Arrays Of Transition Metal Oxide Nanostructures, Wendy Queen

All Dissertations

The ultimate goal of the research presented in this dissertation was to explore new systems containing low–dimensional magnetic nanostructures in hopes of finding new extended solids exhibiting novel magnetic properties due to the confined magnetic lattices. The scope of this research is threefold: 1) to explore new solids containing low–dimensional magnetic nanostructures in the A–M–X–O system, where A is an alkali or alkalinendash;earth metal cation, M is a first–row transition metal cation, and X is P, As, or V, 2) to characterize these new materials and, through chemical substitution, fine tune (and optimize) magnetic and electronic properties of solids that …

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Variations On Graph Products And Vertex Partitions, Jobby Jacob Aug 2009

Variations On Graph Products And Vertex Partitions, Jobby Jacob

All Dissertations

In this thesis we investigate two graph products called double vertex graphs and complete double vertex graphs, and two vertex partitions called dominator partitions and rankings.
We introduce a new graph product called the complete double vertex graph and study its properties. The complete double vertex graph is a natural extension of the Cartesian product and a generalization of the double vertex graph.
We establish many properties of complete double vertex graphs, including results involving the chromatic number of a complete double vertex graph and the characterization of planar complete double vertex graphs. We also investigate the important problem of …

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Integer-Valued Time Series And Renewal Processes, Yunwei Cui Aug 2009

Integer-Valued Time Series And Renewal Processes, Yunwei Cui

All Dissertations

This research proposes a new but simple model for stationary time series of integer counts. Previous work in the area has focused on mixture and thinning methods and links to classical time series autoregressive moving-average difference equations; in contrast, our methods use a renewal process to generate a correlated sequence of Bernoulli trials. By superpositioning independent copies of such processes, stationary series with binomial, Poisson, geometric, or any other discrete marginal distribution can be readily constructed. The model class proposed is parsimonious, non-Markov, and readily generates series with either short or long memory autocovariances. The model can be fitted with …

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