Physical Sciences and Mathematics Commons^™

Changes In The Adsorbate Dipole Layer With Changing D-Filling Of The Metal (Ii) (Co, Ni, Cu) Phthalocyanines On Au(111), Jie Xiao, Peter A. Dowben

Peter Dowben Publications

In combined photoemission and inverse photoemission spectroscopy studies, we observe changes in the metal phthalocyanine molecular orbital offsets with respect to the conducting gold substrate Fermi level, with the changing d-electron filling of the metal (II) (Co, Ni, Cu) phthalocyanines. The implication is that the interfacial dipole layer depends upon the choice of metal (Co, Ni, Cu) centers within the metal (II) phthalocyanines adsorbed on Au(111).

Review Of Information Technology And Moral Philosophy, Keith Miller, Bethany Spielman

Computer Science Faculty Works

No abstract provided.

Faculty Colloquium Examines “Applied Modal Logic”, Heather Lindquist ’09

News and Events

No abstract provided.

Icodes Global Services (Gs): A Single Load-Planning Capability, Jens G. Pohl

Collaborative Agent Design (CAD) Research Center

Over the past decade the Collaborative Agent Design Research Center (CADRC) at California Polytechnic State University (Cal Poly, San Luis Obispo) and its commercial arm CDM Technologies, Inc. (CDM) have developed a suite of information-centric software tools in support of military deployment and distribution processes. All of these tools feature agents that are capable of reasoning about data in the context provided by an internal information model. Together they represent an evolving suite of adaptive Knowledge Management Enterprise Services (KMES) that can be readily configured into a net-centric, Service-Oriented Architecture (SOA) based planning and decision-support toolset for a particular application …

Stable Higher-Charge Discrete Vortices In Hexagonal Optical Lattices, Kjh Law, Pg Kevrekidis, Tj Alexander, W Krolikowski, Ys Kivshar

Panos Kevrekidis

We show that double-charge discrete optical vortices may be completely stable in hexagonal photonic lattices where single-charge vortices always exhibit dynamical instabilities. Even when unstable the double-charge vortices typically have a much weaker instability than the single-charge vortices, and thus their breakup occurs at longer propagation distances.

Global Methane Emissions From Wetlands, Rice Paddies, And Lakes, Qianlai Zhuang, John M. Melack, Sergey Zimov, Katey Marion Walter, Christopher Lee Butenhoff, M. A. K. Khalil

Physics Faculty Publications and Presentations

The current concentration of atmospheric methane is 1774±1.8 parts per billion, and it accounts for 18% of total greenhouse gas radiative forcing [Forster et al., 2007]. Atmospheric methane is 22 times more effective, on a per-unit-mass basis, than carbon dioxide in absorbing long-wave radiation on a 100-year time horizon, and it plays an important role in atmospheric ozone chemistry (e.g., in the presence of nitrous oxides, tropospheric methane oxidation will lead to the formation of ozone). Wetlands are a large source of atmospheric methane, Arctic lakes have recently been recognized as a major source [e.g., Walter et al., 2006], and …

Displacement Estimation Based On Model Calibration In Weak Feedback Optical Self-Mixing System, L. Wei, Jiangtao Xi, J. Chicharo

Professor Joe F. Chicharo

This paper presents a novel method to estimate displacement of a moving object based on model calibration in a weak feedback laser diode self-mixing system. A hybrid genetic algorithm is employed to locate the global minimum for the cost function which is constructed as the discrepancy between theoretically calculated system output and the experimental data. In turn, displacement measurement is achieved by identifying the optimal parameters for the system model. The proposed method is tested by both simulation and experimental setup with measuring accuracy better than 25nm.

Carbon-Centric Computing: It Solutions For Climate Change, Aditya K. Ghose, Helen M. Hasan, T. Spedding

Professor Aditya K. Ghose

IT has a role to play in the current debate on climate change. The current discourse on IT and climate change views IT in a negative light, as a polluter. What remains unrecognized is the critical role of IT as a source of solutions to the climate change problem. We live in a massive, inter-connected Planet Earth Supply Chain. IT provides a range of tools to model, manage and optimize this supply chain. The University of Wollongong Carbon-Centric Computing Initiative (CCCI) seeks to seed a program of research that addresses the climate change problem with a range of computing technologies …

Acceptance Angle Effects On The Beam Attenuation In The Ocean, Emmanuel Boss, Wayne H. Slade, M. Behrenfeld, G. Dall'olmo

Marine Sciences Faculty Scholarship

The beam attenuation serves as a proxy for particulate matter and is a key parameter in visibility algorithms for the aquatic environment. It is well known, however, that the beam attenuation is a function of the acceptance angle of the transmissometer used to measure it. Here we compare eight different transmissometers with four different acceptance angles using four different deployment strategies and sites, and find that their mean attenuation values differ markedly and in a consistent way with instrument acceptance angle: smaller acceptance angles provide higher beam attenuation values. This difference is due to variations in scattered light collected with …

Light-Regulated Sampling Of Protein Kinase Activity (I), Collaborative Project

Dyson College- Seidenberg School of CSIS : Collaborative Projects and Presentations

This entry adheres to the use of the quad chart template to provide a succint description only of the current research project undertaken by the participants. It provides for the following information

1. Participants and Affiliation
2. Overall Project goals
3. Illustrative picture
4. Specific research/artistic/pedagogic foci.

Colorimetric And Ratiometric Sensors For Manganese (Ii), Collaborative Project

Dyson College- Seidenberg School of CSIS : Collaborative Projects and Presentations

This entry adheres to the use of quad chart template to provide a succint description only of the current research project undertaken by the participants. It provides for the following information:

1. Participants and Affiliations
2. Overall Project Goals
3. Illustrative picture
4. Specific research/artistic/pedagogic foci

True-Time Delay Steering Of Phased Array Radars Using Slow Light, Mark Bashkansky, Zachary Dutton, Armen Gulian, David Walker, Fredrik Fatemi, Michael Steiner

Mathematics, Physics, and Computer Science Faculty Articles and Research

Application of slow light linear delay to squint-free (true-time delay) steering of phased array radar antennae is discussed. Theoretical analysis is provided on true-time delay radar requirements, including delay precision, amplitude precision, and bandwidth. We also discuss an improvement to the slow light technique based on stimulated Brillouin scattering by using a Faraday rotator mirror that provides temporally stable, linear (with pump power) delay, applicable to practical implementations. Future directions are considered.

Restoration Of Seagrass Habitat In Tampa Bay Using Large Manatee Grass (Syringodium Filiforme) Sod Units And A Discussion Of Planting Site Sediment Elevation Dynamics, Roger Johansson, Walt Avery, K. B. Hennenfent, J. J. Pacowta

Reports

The final project monitoring results show that the manatee grass transplanting effort was completed successfully. First, the donor site monitoring indicated that disturbances caused by harvesting were fully mitigated within the two year study period. Second, about 1300m2 of manatee grass were established in an area previously devoid of this species. Third, at the end of the study period the per unit area above ground biomass of the restored manatee grass in several of the planting plots was similar to, or may have exceeded the biomass of the donor grass at the time of harvest. Finally, several of the restored …

Marine Spatial Data Infrastructure (Msdi) Challenges And Opportunities: The Cuban Experience, Hilario Calderon, Lee Alexander

Center for Coastal and Ocean Mapping

This paper describes the challenges and opportunities associated with implementing MSDI in Cuba. More specifically, a case example is provided on how Cuba’s National System of Protected Areas (SAMP) could become a component of an overall MSDI.

Chevkinite-Group Minerals From Granulite-Facies Metamorphic Rocks And Associated Pegmatites Of East Antarctica And South India, H. E. Belkin, R. Macdonald, Edward S. Grew

Earth Science Faculty Scholarship

Electron microprobe data are presented for chevkinite-group minerals from granulite-facies rocks and associated pegmatities of the Napier Complex and Mawson Station charnockite in East Antarctica and from the Eastern Ghats, South India. Their compositions conform to the general formula for this group, viz. A(4)BC(2)D(2)Si(4)O(22) where, in the analysed specimens A = (rare-earth elements (REE), Ca, Y, Th), B = Fe(2+) Mg, C = (Al, Mg, Ti, Fe(2+), Fe(3+), Zr) and D = Ti and plot within the perrierite field oftlic total Fe (as FeO) (wt.%) vs. CaO (wt.%) discriminator diagram of Macdonald and Belkin (2002). In contrast to most chevkinite-group …

Second-Order Analysis Of Polyhedral Systems In Finite And Infinite Dimensions With Applications To Robust Stability Of Variational Inequalities, René Henrion, Boris S. Mordukhovich, Nguyen Mau Nam

Mathematics Research Reports

This paper concerns second-order analysis for a remarkable class of variational systems in finite-dimensional and infinite-dimensional spaces, which is particularly important for the study of optimization and equilibrium problems with equilibrium constraints. Systems of this type are described via variational inequalities over polyhedral convex sets and allow us to provide a comprehensive local analysis by using appropriate generalized differentiation of the normal cone mappings for such sets. In this paper we efficiently compute the required coderivatives of the normal cone mappings exclusively via the initial data of polyhedral sets in reflexive Banach spaces. This provides the main tools of second-order …

Scintillation Index Of Modified Bessel–Gaussian Beams Propagating In Turbulent Media, Halil T. Eyyuboglu, Yahya Baykal, Emre Sermutlu, Olga Korotkova, Yangjian Cai

Physics Articles and Papers

The scintillation index is formulated for modified Bessel-Gaussian beams propagating in weakly turbulent media. Numerical calculations applied directly to the derived triple integral show that, for off-axis positions, the modified Bessel-Gaussian beams of higher than zero order scintillate less than Gaussian beams at large input beam sizes and low beam orders with the increasing width parameter initially contributing positively to this phenomenon of less scintillation. As the beam order exceeds two, this advantage is diminished. The modified Bessel-Gaussian beam of order zero is a special case, however, exhibiting lowest scintillation at small input beam sizes. When considered against the propagation …

Ghost Imaging With Twisted Gaussian Schell-Model Beam, Yangjian Cai, Qiang Lin, Olga Korotkova

Physics Articles and Papers

Based on the classical optical coherence theory, ghost imaging with twisted Gaussian Schell-model (GSM) beams is analyzed. It is found that the twist phase of the GSM beam has strong influence on ghost imaging. As the absolute value of the twist factor increases, the ghost image disappears gradually, but its visibility increases. This phenomenon is caused by the fact that the twist phase enhances the transverse spatial coherence of the twisted GSM beam on propagation.

Fluorescent Excitation Of Balmer Lines In Gaseous Nebulae: Case D, V. Luridiana, S. Simón-Díaz, M. Cerviño, R. M. González Delgado, R. L. Porter, Gary J. Ferland

Physics and Astronomy Faculty Publications

Nonionizing stellar continua are a potential source of photons for continuum pumping in the hydrogen Lyman transitions. In the environments where these transitions are optically thick, de-excitation occurs through higher series lines. As a result, the emitted flux in the affected lines has a fluorescent contribution in addition to the usual recombination one; in particular, Balmer emissivities are systematically enhanced above case B predictions. The effectiveness of such a mechanism in H II regions and the adequacy of photoionization models as a tool to study it are the two main focuses of this work. We find that photoionization models of …

Small-Volume U-Pb Zircon Geochronology By Laser Ablation-Multicollector-Icp-Ms, Scott Johnston, George Gehrels, Victor Valencia, Joaquin Ruiz

Physics

U–Pb zircon geochronology is hampered by problems acquiring meaningful geologic ages on zoned grains that retain isotope signatures from multiple growth or thermal events. We present a new method using laser ablation-multicollector-inductively coupled plasma-mass spectrometry to overcome complications associated with intricately zoned zircon crystals through in situ sampling of zircon volumes as small as 12–14 µm in diameter by 4–5 µm in depth (< 3 ng of zircon). Using Channeltron multipliers to monitor Pb intensities in conjunction with a total ion counting method and errors calculated as function of the number of counts, the small-volume technique reproduced published ages on eight Mesoproterozoic–Cretaceous secondary zircon standards precise and accurate within 2%, and an age not, vert, similar 1 Ma too young on a Oligocene-aged grain. Two initial applications of the small-volume technique — the detrital zircon provenance of fine-grained mudstones and shales and the creation of zircon U–Pb age maps to investigate the detrital and metamorphic history of a granulite-facies paragneiss — demonstrate the utility of this technique to a variety of geologic problems and confirm the viability of laser ablation-multicollector-inductively coupled plasma-mass spectrometry as a tool for high spatial resolution U–Pb geochronology.

The Discovery Of Magnetotactic/Magnetosensitive Bacteria, Richard B. Frankel

Physics

No abstract provided.

A Critical Centre-Stable Manifold For The Cubic Focusing Schroedinger Equation In Three Dimensions, Marius Beceanu

Mathematics and Statistics Faculty Scholarship

Consider the H^{1/2}-critical Schroedinger equation with a cubic nonlinearity in R^3, i \partial_t \psi + \Delta \psi + |\psi|^2 \psi = 0. It admits an eight-dimensional manifold of periodic solutions called solitons e^{i(\Gamma + vx - t|v|^2 + \alpha^2 t)} \phi(x-2tv-D, \alpha), where \phi(x, \alpha) is a positive ground state solution of the semilinear elliptic equation -\Delta \phi + \alpha^2\phi = \phi^3. We prove that in the neighborhood of the soliton manifold there exists a H^{1/2} real analytic manifold N of asymptotically stable solutions of the Schroedinger equation, meaning they are the sum of a moving soliton and a dispersive …

Planning For A Bull Market For Wetlands, Fred P. Bosselman

All Faculty Scholarship

Until recently, wetlands had value in the marketplace only as targets for destruction. Today, wetlands often have market value for uses that do not require that they be dredged and filled. Such opportunities include: 1. Carbon storage offsets for greenhouse gas emissions; 2. Mitigation banks for destruction of other wetlands; 3. Conservation banks for wildlife protection; 4. Tradable water quality protection rights; 5. Sites for growing algae or other biofuel crops. These new uses have valid public benefits, but most laws and ordinances were not written with these possibilities in mind. Planners and lawyers need to think about ways to …

Modeling The Magnetic Pickup Of An Electric Guitar, Nicholas G. Horton, Thomas R. Moore

Student-Faculty Collaborative Research Publications

The magnetic pickup of an electric guitar uses electromagnetic induction to convert the motion of a ferromagnetic guitar string into an electrical signal. Although the magnetic pickup is often cited as an everyday application of Faraday's law, few sources mention the distortion that the pickup generates when converting string motion into an electric signal, and even fewer attempt to analyze and explain this distortion. By modeling the magnet and ferromagnetic wire as surfaces with magnetic charge, an intuitive model that accurately predicts the output of a magnetic guitar pickup can be constructed. More
importantly, this model can be understood and …

A Proper Orthogonal Decomposition Approach To Approximate Balanced Truncation Of Infinite Dimensional Linear Systems, John R. Singler, Belinda A. Batten

Mathematics and Statistics Faculty Research & Creative Works

We extend a method for approximate balanced reduced order model derivation for finite dimensional linear systems developed by Rowley (Int. J. Bifur. Chaos Appl. Sci. Eng. 15(3) (2005), pp. 997-1013) to infinite dimensional systems. The algorithm is related to standard balanced truncation, but includes aspects of the proper orthogonal decomposition in its computational approach. The method can be also applied to nonlinear systems. Numerical results are presented for a convection diffusion system.

Chebyshev Optimized Approximate Deconvolution Models Of Turbulence, Iuliana Stanculescu, William Layton

Mathematics Faculty Articles

If the Navier–Stokes equations are averaged with a local, spacial convolution type filter,ϕ¯¯¯=gδ∗ϕ, the resulting system is not closed due to the filtered nonlinear termuu¯¯¯¯. An approximate deconvolution operator DD is a bounded linear operator which satisfies

u=D(u¯¯)+O(δα), Turn MathJaxon

where δδ is the filter width and α⩾2α⩾2. Using a deconvolution operator as an approximate filter inverse, yields the closure

uu¯¯¯¯=D(u¯¯)D(u¯¯)¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯+O(δα). Turn MathJaxon

The residual stress of this model (and related models) depends directly on the deconvolution error,u−D(u¯¯). This report derives deconvolution operators yielding an effective turbulence model, which minimize the deconvolution error for velocity fields with finite kinetic energy. …

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

Weather Station Data

No abstract provided.

A Deep Xmm-Newton Observation Of The Quasar 3c 287, G. Salvesen, J. M. Miller, E. Cackett, A. Siemiginowska

Physics and Astronomy Faculty Research Publications

We report on an XMM-Newton observation of the z = 1.055 quasar and Gigahertz Peaked Spectrum (GPS) source 3C 287. Our 62.3 ks observation provides an exceptional X-ray view of a prominent member of this important subclass of active galactic nuclei (AGNs). The X-ray spectra of 3C 287 are consistent with a simple absorbed power law with a spectral index of Γ = 1.72 ± 0.02. Our fits imply a bolometric luminosity of L = 5.8 ± 0.2 × 10⁴⁵ erg s^-1 over the 0.3-10.0 keV band; this gives a mass lower limit of M _{BH min} >= …

Grb060602b = Swift J1749.4-2807: An Unusual Transiently Accreting Neutron-Star X-Ray Binary, R. Wijnands, E. Rol, E. Cackett, R. L. C. Starling, R. A. Remillard

Physics and Astronomy Faculty Research Publications

We present an analysis of the Swift Burst Alert Telescope (BAT) and X-ray telescope (XRT) data of GRB060602B, which is most likely an accreting neutron star in a binary system and not a gamma-ray burst. Our analysis shows that the BAT burst spectrum is consistent with a thermonuclear flash (type I X-ray burst) from the surface of an accreting neutron star in a binary system. The X-ray binary nature is further confirmed by the report of a detection of a faint point source at the position of the XRT counterpart of the burst in archival XMM-Newton data approximately six year …

Wavelet Reconstruction Of Nonuniformly Sampled Signals, Leming Qu, Partha S. Routh, Phil D. Anno

Mathematics Faculty Publications and Presentations

For the reconstruction of a nonuniformly sampled signal based on its noisy observations, we propose a level dependent l₁ penalized wavelet reconstruction method. The LARS/Lasso algorithm is applied to solve the Lasso problem. The data adaptive choice of the regularization parameters is based on the AIC and the degrees of freedom is estimated by the number of nonzero elements in the Lasso solution. Simulation results conducted on some commonly used 1_D test signals illustrate that the proposed method possesses good empirical properties.