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Launhardt’S Early Contributions To The Spatial Monopoly Model, Yeung-Nan Shieh Jan 2008

Launhardt’S Early Contributions To The Spatial Monopoly Model, Yeung-Nan Shieh

Faculty Publications

No abstract provided.

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Singlet Oxygen Chemistry In Water. 2. Photoexcited Sensitizer Quenching By O2 At The Water−Porous Glass Interface, Jovan Giaimuccio, Matibur Zamadar, David Aebisher, Gerald J. Meyer, Alexander Greer Jan 2008

Singlet Oxygen Chemistry In Water. 2. Photoexcited Sensitizer Quenching By O2 At The Water−Porous Glass Interface, Jovan Giaimuccio, Matibur Zamadar, David Aebisher, Gerald J. Meyer, Alexander Greer

Faculty Publications

Insight into the O2 quenching mechanism of a photosensitizer (static or dynamic) would be useful for the design of heterogeneous systems to control the mode of generation of 1O2 in water. Here, we describe the use of a photosensitizer, meso-tetra(N-methyl-4-pyridyl)porphine (1), which was adsorbed onto porous Vycor glass (PVG). A maximum loading of 1.1 × 10−6 mol 1 per g PVG was achieved. Less than 1% of the PVG surface was covered with photosensitizer 1, and the penetration of 1 reaches a depth of 0.32 mm along all faces of the glass. Time-resolved measurements …

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Singlet Oxygen Chemistry In Water:  A Porous Vycor Glasssupported Photosensitizer, David Aebisher, Nikolay S. Azar, Matibur Zamadar, Naveen Gandra, Harry D. Gafney, Roumei Gao, Alexander Greer Jan 2008

Singlet Oxygen Chemistry In Water:  A Porous Vycor Glasssupported Photosensitizer, David Aebisher, Nikolay S. Azar, Matibur Zamadar, Naveen Gandra, Harry D. Gafney, Roumei Gao, Alexander Greer

Faculty Publications

Singlet molecular oxygen [1O2 (1Δg)] is generated cleanly in aqueous solution upon irradiation of a heterogeneous complex, meso-tetra(N-methyl-4-pyridyl)porphine (1) adsorbed onto porous Vycor glass (PVG). The cationic photosensitizer 1 tightly binds onto PVG and gives a stable material, which does not dissociate 1 into the surrounding aqueous phase. The production of 1O2 was measured by monitoring the time-resolved 1O2 (1Δg) phosphorescence at 1270 nm. Indirect analysis of 1O2 generation was also carried out with the photooxidation oftrans-2-methyl-2-pentenoate anion, which afforded the corresponding hydroperoxide. Sensitizer-1-impregnated PVG gives rise to a new singlet …

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The Alien Invasion, Ediberto Román Jan 2008

The Alien Invasion, Ediberto Román

Faculty Publications

Bill Gates, founder of Microsoft, repeatedly complains about strict immigration policies' impact on the ability for businesses to hire skilled workers. In terms of other sectors of the economy, an American Farm Bureau Federation study notes that "if agriculture's access to migrant labor were cut off, as much as $5- 9 billion in annual production of... commodities.., would be lost in the short term. Over the longer term, this annual loss would increase to $6.5-12 billion as the shock worked its way through the sector." Preeminent economist John Kenneth Galbraith effectively responded to those who have advocated for closed borders …

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Hypogene Calcitization: Evaporite Diagenesis In The Western Delaware Basin, Kevin W. Stafford, Dana Ulmer-Scholle, Laura Rosales-Lagarde Jan 2008

Hypogene Calcitization: Evaporite Diagenesis In The Western Delaware Basin, Kevin W. Stafford, Dana Ulmer-Scholle, Laura Rosales-Lagarde

Faculty Publications

Evaporite calcitization within the Castile Formation of the Delaware Basin is more widespread and diverse than originally recognized. Coupled field and GIS studies have identified more than 1000 individual occurrences of calcitization within the Castile Formation outcrop area, which includes both calcitized masses (limestone buttes) and laterally extensive calcitized horizons (limestone sheets). Both limestone buttes and sheets commonly contain a central brecciated zone that we attribute to hypogene dissolution. Lithologic fabric of calcitized zones ranges from little alteration of original varved laminae to fabrics showing extensive laminae distortion as well as extensive vuggy and open cavernous porosity. Calcitization is most …

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Hypogene Speleogenesis Within The Central Basin Platform: Karst Porosity In The Yates Field, Pecos County, Texas, U.S.A., Kevin W. Stafford, Fred H. Behnken, Jesse G. White Jan 2008

Hypogene Speleogenesis Within The Central Basin Platform: Karst Porosity In The Yates Field, Pecos County, Texas, U.S.A., Kevin W. Stafford, Fred H. Behnken, Jesse G. White

Faculty Publications

The Yates Unit Oil Field is located on the southeastern tip of the Central Basin Platform in eastern Pecos County, Texas. It produces from Middle Permian strata, primarily the upper San Andres Formation. Locally, the productive upper San Andres Formation is comprised of successively vertically stacked progradational shelf carbonates. Stratigraphically overlying the Yates Field reservoir, the Toborg Field produces from the uppermost Triassic and Cretaceous units. Both fields are bounded on the north and east sides by the Pecos River, which has remained entrenched in its current location since the early Tertiary. As mapped, the top of the San Andres …

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Castile Evaporite Karst Potential Map Of The Gypsum Plain, Eddy County, New Mexico And Culberson County, Texas: A Gis Methodological Comparison, Kevin W. Stafford, Laura Rosales-Lagarde, Penelope J. Boston Jan 2008

Castile Evaporite Karst Potential Map Of The Gypsum Plain, Eddy County, New Mexico And Culberson County, Texas: A Gis Methodological Comparison, Kevin W. Stafford, Laura Rosales-Lagarde, Penelope J. Boston

Faculty Publications

Castile Formation gypsum crops out over ,1,800 km2 in the western Delaware Basin where it forms the majority of the Gypsum Plain. Karst development is well recognized in the Gypsum Plain (i.e., filled and open sinkholes with associated caves); however, the spatial occurrence has been poorly known. In order to evaluate the extent and distribution of karst development within the Castile portion of the Gypsum Plain, combined field and Geographic Information System (GIS) studies were conducted, which enable a first approximation of regional speleogenesis and delineate karst-related natural resources for management. Field studies included physical mapping of 50, 1-km2 sites, …

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Using Data Mining For Forecasting Data Management Needs, Qingyu Zhang, Richard S. Segall Jan 2008

Using Data Mining For Forecasting Data Management Needs, Qingyu Zhang, Richard S. Segall

Faculty Publications

This chapter illustrates the use of data mining as a computational intelligence methodology for forecasting data management needs. Specifically, this chapter discusses the use of data mining with multidimensional databases for determining data management needs for the selected biotechnology data of forest cover data (63,377 rows and 54 attributes) and human lung cancer data set (12,600 rows of transcript sequences and 156 columns of gene types). The data mining is performed using four selected software of SAS® Enterprise MinerTM, Megaputer PolyAnalyst® 5.0, NeuralWare Predict®, and Bio- Discovery GeneSight®. The analysis and results will be used to enhance the intelligence capabilities …

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The Mysteriously Reappearing Cause Of Action: The Court’S Expanded Concept Of Intentional Gender And Race Discrimination In Federally Funded Programs, Derek W. Black Jan 2008

The Mysteriously Reappearing Cause Of Action: The Court’S Expanded Concept Of Intentional Gender And Race Discrimination In Federally Funded Programs, Derek W. Black

Faculty Publications

This Article addresses whether a cause of action exists under federal statutes to challenge gender and racial inequity in federally funded programs. The question has widespread ramifications because Congress appropriates funds to millions of programs that are subject to these statutes. The Court has held that the only cause of action that exists under these statutes is for intentional discrimination, but in a series of recent cases the Court has developed a framework that broadens the concept of intentional discrimination. Unfortunately, lower courts have focused on older and narrower interpretations of intentional discrimination without accounting for the more complex nuances …

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A Study Of Consumers' Post Discharge Finances: Struggle, Stasis, Or Fresh Start?, Lois R. Lupica, Jay L. Zagorsky Ph.D. Jan 2008

A Study Of Consumers' Post Discharge Finances: Struggle, Stasis, Or Fresh Start?, Lois R. Lupica, Jay L. Zagorsky Ph.D.

Faculty Publications

The postwar U.S. has experienced an extremely sharp rise in consumer bankruptcies. What happens to these consumers financially after filing for bankruptcy? Do filers catch up with their non-filing peers, stay a constant distance behind or fall further behind over time? This question is investigated empirically using a new set of financial and bankruptcy data obtained from a large national random survey of bankruptcy filers and non-filers. Along some simple financial dimensions, such as car ownership, bankruptcy filers are not disadvantaged compared to non-filers. Along more complex indicators, such as total income and net worth, filers catch up over time …

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Law And Governance In The 21st Century Regulatory State, Jason M. Solomon Jan 2008

Law And Governance In The 21st Century Regulatory State, Jason M. Solomon

Faculty Publications

No abstract provided.

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Understanding Big Bang In Loop Quantum Cosmology: Recent Advances, Parampreet Singh Jan 2008

Understanding Big Bang In Loop Quantum Cosmology: Recent Advances, Parampreet Singh

Faculty Publications

We discuss the way non-perturbative quantization of cosmological spacetimes in loop quantum cosmology provides insights on the physics of Planck scale and the resolution of big bang singularity. In recent years, rigorous examination of mathematical and physical aspects of the quantum theory, have singled out a consistent quantization which is physically viable and various early ideas have been shown to be inconsistent. These include 'physical effects' originating from modifications to inverse scale factors in the flat models. The singularity resolution is understood to originate from the non-local nature of curvature in the quantum theory and the underlying polymer representation. Based …

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A General Framework For Extending Means To Higher Orders, Jimmie Lawson, Yongdo Lim Jan 2008

A General Framework For Extending Means To Higher Orders, Jimmie Lawson, Yongdo Lim

Faculty Publications

Although there is an extensive literature on various means of two positive operators and their applications, these means do not typically readily extend to means of three and more operators. It has been an open problem to define and prove the existence of these higher order means in a general setting. In this paper we lay the foundations for such a theory by showing how higher order means can be inductively defined and established in general metric spaces, in particular, in convex metric spaces. We consider uniqueness properties and preservation properties of these extensions, properties which provide validation to our …

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On Radicals Of Module Coalgebras, Yuqun Chen, Siu Hung Ng, Kar Ping Shum Jan 2008

On Radicals Of Module Coalgebras, Yuqun Chen, Siu Hung Ng, Kar Ping Shum

Faculty Publications

We introduce the notion of an idempotent radical class of module coalgebras over a bialgebra B. We prove that if R is an idempotent radical class of B-module coalgebras, then every B-module coalgebra contains a unique maximal B-submodule coalgebra in R. Moreover, a B-module coalgebra C is a member of R if, and only if, D B is in R for every simple subcoalgebra D of C. The collection of B-cocleft coalgebras and the collection of H-projective module coalgebras over a Hopf algebra H are idempotent radical classes. As applications, we use these idempotent radical classes to give another proofs …

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Instabilities Of Diffuse Interfaces, N. Bessonov, J. Pojman, G. Viner, V. Volpert, B. Zoltowski Jan 2008

Instabilities Of Diffuse Interfaces, N. Bessonov, J. Pojman, G. Viner, V. Volpert, B. Zoltowski

Faculty Publications

Composition gradients in miscible liquids can create volume forces resulting in various interfacial phenomena. Experimental observations of these phenomena are related to some difficulties because they are transient, sufficiently weak and can be hidden by gravity driven flows. As a consequence, the question about their existence and about adequate mathematical models is not yet completely elucidated. In this work we present some experimental evidences of interfacial phenomena in miscible liquids and numerical simulations of miscible drops and diffuse interfaces. © 2008 EDP Sciences.

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Bipartite Toughness And The K-Factors In Bipartite Graphs, Guizhen Liu, Jianbo Quan, Jonathan Z. Sun, Rui Xu Jan 2008

Bipartite Toughness And The K-Factors In Bipartite Graphs, Guizhen Liu, Jianbo Quan, Jonathan Z. Sun, Rui Xu

Faculty Publications

We define a new invariant tB(G) in bipartite graphs that is analogous to the toughness t(G) and we give sufficient conditions in term of tB(G) for the existence of k-factors in bipartite graphs. We also show that these results are sharp.

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Unified Dynamical Symmetries In The Symplectic Extension Of The Interacting Vector Boson Model, A. I. Georgieva, H. G. Ganev, J. P. Draayer, V. P. Garistov Jan 2008

Unified Dynamical Symmetries In The Symplectic Extension Of The Interacting Vector Boson Model, A. I. Georgieva, H. G. Ganev, J. P. Draayer, V. P. Garistov

Faculty Publications

The algebraic Interacting Vector Boson Model (IVBM) is extended by exploiting three new subgroup chains in the reduction of its highest symplectic dynamical symmetry group Sp(12, R) to the physical angular momentum subgroup SO(3). The corresponding exactly solvable limiting cases are applied to achieve a description of complex nuclear collective spectra of even-even nuclei in the rare earth and actinide regions up to states of very high angular momentum. First we exploit two reductions in which collective modes can be mixed, and obtain successful descriptions of both positive and negative parity band conflgurations. The structure of band-head conflgurations, whose importance …

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Holography From Loop Quantum Gravity, Rodolfo Gambini, Jorge Pullin Jan 2008

Holography From Loop Quantum Gravity, Rodolfo Gambini, Jorge Pullin

Faculty Publications

We show that holography follows directly from the basic structure of spherically symmetric loop quantum gravity. The result is not dependent on detailed assumptions about the dynamics of the theory being considered. It ties strongly the amount of information contained in a region of space to the tight mathematical underpinnings of loop quantum geometry. © 2008 World Scientific Publishing Company.

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How Are Preferences Revealed?, John Beshears, James J. Choi, David Laibson, Brigitte C. Madrian Jan 2008

How Are Preferences Revealed?, John Beshears, James J. Choi, David Laibson, Brigitte C. Madrian

Faculty Publications

Revealed preferences are tastes that rationalize an economic agent's observed actions. Normative preferences represent the agent's actual interests. It sometimes makes sense to assume that revealed preferences are identical to normative preferences. But there are many cases where this assumption is violated. We identify five factors that increase the likelihood of a disparity between revealed preferences and normative preferences: passive choice, complexity, limited personal experience, third-party marketing, and intertemporal choice. We then discuss six approaches that jointly contribute to the identification of normative preferences: structural estimation, active decisions, asymptotic choice, aggregated revealed preferences, reported preferences, and informed preferences. Each …

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Effects Of Friendship In Transactions In An Emerging Market: Empirical Evidence From Brazil, Wesley Mendes-Da-Silva, Thaís Fernanda Salves De Brito, Rubens Famá, Jonathan T. Liljegren Jan 2008

Effects Of Friendship In Transactions In An Emerging Market: Empirical Evidence From Brazil, Wesley Mendes-Da-Silva, Thaís Fernanda Salves De Brito, Rubens Famá, Jonathan T. Liljegren

Faculty Publications

This paper considers the inclusion of human behavioral aspects and implications of cognitive psychology and anthropology in decisions relating to the emerging field of behavioral finance. The formulated hypotheses were tested using 400 questionnaires, answered by students enrolled in MBA programs. The principal results suggest that individuals involved in transactions among friends or among strangers assume different behaviors—friends agree about the price attributed to an asset, while strangers show the propensity to bargain.

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Promoting Supportive Relationships In Youth Programs: A Self-Determination Theory Perspective, Mat D. Duerden, Ann Gillard Jan 2008

Promoting Supportive Relationships In Youth Programs: A Self-Determination Theory Perspective, Mat D. Duerden, Ann Gillard

Faculty Publications

Although research suggests that positive contact with nonparental adults is developmentally beneficial for youth; many adolescents do not have access to such relationships. It is important that adults structure existing relationships to optimize positive youth development. Relationships with adults, who support youth’s needs for autonomy, relatedness, and competence, provide youth with scaffolding as they navigate their way through adolescence. Self-Determination Theory offers a straight-forward approach to understanding the elements of contexts that best promote the development of supportive relationships. The purpose of this paper is to review the literature concerning youth-adult relationships, including their associated prevalence and developmental benefits across …

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Time Reversal, Brian E. Anderson, Michele Griffa, Paul A. Johnson, Carene Larmat, Timothy J. Ulrich Jan 2008

Time Reversal, Brian E. Anderson, Michele Griffa, Paul A. Johnson, Carene Larmat, Timothy J. Ulrich

Faculty Publications

This article provides an historical overview of Time Reversal (TR), introduces its basic physics, addresses advantages and limitations, and describes some applications of this very active research area of acoustics. In the Geophysics Group at the Los Alamos National Laboratory, we conduct studies of TR of elastic waves in solids. Our work includes application of TR to nondestructive evaluation of materials, as well as to earthquake source characterization, and ground-based nuclear explosion monitoring. We emphasize the term elastic waves here to underscore that we include both compression and shear waves, in contrast to purely acoustic waves that are only compressional.

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Adapting Adtrees For High Arity Features, Irene Langkilde-Geary, Robert Van Dam, Dan A. Ventura Jan 2008

Adapting Adtrees For High Arity Features, Irene Langkilde-Geary, Robert Van Dam, Dan A. Ventura

Faculty Publications

ADtrees, a data structure useful for caching sufficient statistics, have been successfully adapted to grow lazily when memory is limited and to update sequentially with an incrementally updated dataset. For low arity symbolic features, ADtrees trade a slight increase in query time for a reduction in overall tree size. Unfortunately, for high arity features, the same technique can often result in a very large increase in query time and a nearly negligible tree size reduction. In the dynamic (lazy) version of the tree, both query time and tree size can increase for some applications. Here we present two modifications to …

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Sentiment Regression: Using Real-Valued Scores To Summarize Overall Document Sentiment, Adam Drake, Eric K. Ringger, Dan A. Ventura Jan 2008

Sentiment Regression: Using Real-Valued Scores To Summarize Overall Document Sentiment, Adam Drake, Eric K. Ringger, Dan A. Ventura

Faculty Publications

In this paper, we consider a sentiment regression problem: summarizing the overall sentiment of a review with a real-valued score. Empirical results on a set of labeled reviews show that real-valued sentiment modeling is feasible, as several algorithms improve upon baseline performance. We also analyze performance as the granularity of the classification problem moves from two-class (positive vs. negative) towards infinite-class (real-valued).

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A Reductio Ad Absurdum Experiment In Sufficiency For Evaluating (Computational) Creative Systems, Dan A. Ventura Jan 2008

A Reductio Ad Absurdum Experiment In Sufficiency For Evaluating (Computational) Creative Systems, Dan A. Ventura

Faculty Publications

We consider a combination of two recent proposals for characterizing computational creativity and explore the sufficiency of the resultant framework. We do this in the form of a gedanken experiment designed to expose the nature of the framework, what it has to say about computational creativity, how it might be improved and what questions this raises.

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Determining The Refractive Index In The Extreme Ultraviolet Using Kramers-Kronig On Thin-Film Scandium Oxide Transmission Data, David D. Allred, Jacqualine J. Butterfield Jan 2008

Determining The Refractive Index In The Extreme Ultraviolet Using Kramers-Kronig On Thin-Film Scandium Oxide Transmission Data, David D. Allred, Jacqualine J. Butterfield

Faculty Publications

Whereas the real part of the refractive index is dependent on both transmittance and reflectance, the imaginary part can be determined from transmittance data alone. It is possible to use Kramers-Kronig analysis to calculate the real part if the imaginary part is known over a sufficiently broad range. We show that the delta calculated from reflection and transmission data without taking into account roughness may underestimate the real part of the refractive index of the scandium oxide samples we are studying by up to 40% near 270 eV.

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Enhancing Special Educators' Knowledge And Understanding Of Hiv/Aids, Mary Anne Prater, Nancy M. Sileo, Thomas W. Sileo Jan 2008

Enhancing Special Educators' Knowledge And Understanding Of Hiv/Aids, Mary Anne Prater, Nancy M. Sileo, Thomas W. Sileo

Faculty Publications

HIV/AIDS continues to spread among children, youth, and young adults across all racial, ethnic, and cultural populations, including those with disabilities. This article considers information on HIV/AIDS such as individuals' health-risk behaviors, environmental circumstances, and perceptions that may contribute to HIV-infection; how disability characteristics, and cultural traits and values impact school-based HIV/AIDS prevention programs; and, culturally competent instructional considerations that acknowledge these variables.

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Nanoscale Characterization Of Thin Film Coatings Using Annular Dark Field Scanning Transmission Electron Microscopy, Guillermo Acosta, Richard Vanfleet, David D. Allred Jan 2008

Nanoscale Characterization Of Thin Film Coatings Using Annular Dark Field Scanning Transmission Electron Microscopy, Guillermo Acosta, Richard Vanfleet, David D. Allred

Faculty Publications

When considering the optical performance of thin films in the Extreme Ultraviolet (EUV), developing an accurate physical description of a thin film coating is necessary to be able to successfully model optical performance. With the short wavelengths of the EUV, film interfaces and sample roughness warrant special attention and care. The surfaces of thin film samples are routinely measured by Atomic Force Microscopy, from which roughness can be determined. However, characterizing the quality of interfaces below the surface is much more challenging. In a recent study of scandium oxide thin films, High Resolution Transmission Electron Microscopy and Annular Dark Field …

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Utilizing Phrase-Similarity Measures For Detecting And Clustering Informative Rss News Articles, Yiu-Kai D. Ng, Maria Soledad Pera Jan 2008

Utilizing Phrase-Similarity Measures For Detecting And Clustering Informative Rss News Articles, Yiu-Kai D. Ng, Maria Soledad Pera

Faculty Publications

As the number of RSS news feeds continue to increase over the Internet, it becomes necessary to minimize the workload of the user who is otherwise required to scan through huge numbers of news articles to find related articles of interest, which is a tedious and often an impossible task. In order to solve this problem, we present a novel approach, called InFRSS, which consists of a correlation-based phrase matching (CPM) model and a fuzzy compatibility clustering (FCC) model. CPM can detect RSS news articles containing phrases that are the same as well as semantically alike, and dictate the degrees …

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Socially Rational Models For Autonomous Agents, Wynn C. Stirling, James K. Archibald, Matthew S. Nokleby Jan 2008

Socially Rational Models For Autonomous Agents, Wynn C. Stirling, James K. Archibald, Matthew S. Nokleby

Faculty Publications

Autonomous multi-agent systems that are to coordinate must be designed according to models that accommodate such complex social behavior as compromise, negotiation, and altruism. In contrast to individually rational models, where each agent seeks to maximize its own welfare without regard for others, socially rational agents have interests beyond themselves. Such models require a new type of utility function a social utility to ensure three desirable properties: (a) conditional preferences agents may adjust their preferences to account for the preferences of others; (b) endogeny group preferences are determined internally by interactions between individual agents; (c) framing invariance reformulations of the …

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