Digital Commons Network^™

Lorentz Violation And Alpha-Decay, Brett David Altschul

Faculty Publications

Relating the effective Lorentz violation coefficients for composite particles to the coefficients for their constituent fields is a challenging problem. We calculate the Lorentz violation coefficients relevant to the dynamics of an α particle in terms of proton and neutron coefficients. The α-particle coefficients would lead to anisotropies in the α decays of nuclei, and because the decay process involves quantum tunneling, the effects of any Lorentz violations could be exponentially enhanced.

An Infrared Imaging Method For High-Throughput Combinatorial Investigation Of Hydrogenation-Dehydrogenation And New Phase Formation Of Thin Films, H. Oguchi, Jason R. Hattrick-Simpers, I. Takeuchi, E. J. Heilweil, L. A. Bendersky

Faculty Publications

We have developed an infrared imaging setup enabling in situ infrared images to be acquired, and expanded on capabilities of an infrared imaging as a high-throughput screening technique, determination of a critical thickness of a Pd capping layer which significantly blocks infrared emission from below, enhancement of sensitivity to hydrogenation and dehydrogenation by normalizing raw infrared intensity of a Mg thin film to an inert reference, rapid and systematic screening of hydrogenation and dehydrogenation properties of a Mg–Ni composition spread covered by a thickness gradient Pd capping layer, and detection of formation of a Mg₂Si phase in a …

Detrital-Zircon Geochronology Of The Metasedimentary Rocks Of North-Western Graham Land, David L. Barbeau Jr, Justin T. Davis, Kendra E. Murray, Victor Valencia, George E. Gehrels, Khandaker M. Zahid, David J. Gombosi

Faculty Publications

Metasedimentary rocks constitute an important but comparatively poorly understood part of the Antarctic Peninsula. Herein we report single-grain U-Pb detrital-zircon ages from samples of the Trinity Peninsula and Botany Bay Groups of north-western Graham Land. All studied samples are dominated by a large and narrowly defined population of late Palaeozoic zircons. Significant early–middle Palaeozoic and minor Neoproterozoic and Mesoproterozoic sub-populations constitute the majority of pre-Carboniferous grains. These detrital-zircon age populations are consistent with sediment derivation entirely from western Gondwana sources. Despite the clear Gondwana signatures, our data suggest that the Trinity Peninsula Group province was either a parautochthonous peri-Gondwanan terrane …

A Remote Sensing And Gis-Assisted Spatial Decision Support System For Hazardous Waste Site Monitoring, John R. Jensen, Michael E. Hodgson, Maria Garcia-Quijano, Jungho Im, Jason A. Tullis

Faculty Publications

Humans produce large amounts of waste that must be processed or stored so that it does not contaminate the environment. When hazardous wastes are stored, waste site monitoring is typically conducted in situ which can lead to a serious time lag between the onset of a problem and detection. A Remote Sensing and GIS-assisted Spatial Decision Support System for Hazardous Waste Site Monitoring was developed to improve hazardous waste site management. The system was designed to be recursive, flexible, and integrative. It is recursive because the system is implemented iteratively until the risk assessment subsystem determines that an event is …

Legal Holes, Noa Ben-Asher

Faculty Publications

(Excerpt)

In the years that followed the events of September 11, 2001, a debate crystallized between those who think that “legal grey and black holes”—which I call simply “legal holes”—are necessary and integral to U.S. law and those who think that they are dangerous and should be abolished. Legal black holes “arise when statutes or legal rules ‘either explicitly exempt[] the executive from the requirements of the rule of law or explicitly exclude[] judicial review of executive action.’” Grey holes, in contrast, “arise when ‘there are some legal constraints on executive action . . . but the[y] are so insubstantial …

Representation Reinforcement: A Legislative Solution To A Legislative Process Problem, Anita S. Krishnakumar

Faculty Publications

One of the most valuable—and disturbing—insights offered by public choice theory has been the recognition that wealthy, well-organized interests with narrow, intense preferences often dominate the legislative process while diffuse, unorganized interests go under-represented. Responding to this insight, legal scholars in the fields of statutory interpretation and administrative law have suggested that the solution to the problem of representational inequality lies with the courts. Indeed, over the past two decades, scholars in these fields have offered up a host of John Hart Ely-inspired representation reinforcing "canons of construction," designed to encourage judges to use their role as statutory interpreters to …

Sample Size Calculation For Finding Unseen Species, Hongmei Zhang, Hal Stern

Faculty Publications

Estimation of the number of species extant in a geographic region has been discussed in the statistical literature for more than sixty years. The focus of this work is on the use of pilot data to design future studies in this context. A Dirichlet-multinomial probability model for species frequency data is used to obtain a posterior distribution on the number of species and to learn about the distribution of species frequencies. A geometric distribution is proposed as the prior distribution for the number of species. Simulations demonstrate that this prior distribution can handle a wide range of species frequency distributions …

The Effect Of Copt Crystallinity And Grain Texturing On Properties Of Exchange-Coupled Fe/Copt Systems, H. Oguchi, A. Zambano, M. Yu, Jason R. Hattrick-Simpers, D. Banerjee, Y. Liu, Z. L. Wang, J. P. Liu, S. E. Lofland, D. Josell, I. Takeuchi

Faculty Publications

The effect of the crystallinity and the grain texturing of CoPt hard layers on exchange coupled Fe/CoPt soft/hard magnetic systems was studied using gradient thickness multilayer thin films. We have studied the hard layer structures by transmission electron microscopy and x-ray diffraction, and characterized the exchange coupling interaction through magnetization loops obtained by the magneto-optical Kerr effect measurement. We found that exchange coupling strongly depends on the crystalline characteristics of the CoPt hard layer. There is correlation between the mixture of different grain orientations of the CoPt hard layer and coupling efficiency. In particular, interlayer coupling is enhanced when there …

Polymer Composite And Nanocomposite Dielectric Materials For Pulse Power Energy Storage, P. Barber, S. Balasubramanian, Y. Anguchamy, S. Gong, A. Wibowo, H. Gao, Harry J. Ploehn, Hans-Conrad Zur Loye

Faculty Publications

This review summarizes the current state of polymer composites used as dielectric materials for energy storage. The particular focus is on materials: polymers serving as the matrix, inorganic fillers used to increase the effective dielectric constant, and various recent investigations of functionalization of metal oxide fillers to improve compatibility with polymers. We review the recent literature focused on the dielectric characterization of composites, specifically the measurement of dielectric permittivity and breakdown field strength. Special attention is given to the analysis of the energy density of polymer composite materials and how the functionalization of the inorganic filler affects the energy density …

Integration Of Modified Universal Soil Loss Equation (Musle) Into A Gis Framework To Assess Soil Erosion Risk, Yanli Zhang, J. Degroote, Calvin Wolter, Ramanathan Sugumaran

Faculty Publications

Soil erosion is an important economic and environmental concern throughout the world. In order to assess soil erosion risk and conserve water and soil resources, soil erosion modeling at the watershed scale is urgently needed. This study integrated the Modified Universal Soil Loss Equation (MUSLE) in a Geographic Information System (GIS) framework in the form of a tool called ArcMUSLE, an extension of ArcGIS® software, to assist soil and water conservation agencies in soil erosion risk assessment and prioritization of critical areas for soil erosion control practices. With widely available spatial data, this tool can be applied to determine curve …

The Planetary Nebula Spectrograph Elliptical Galaxy Survey: The Dark Matter In Ngc 4494, N. R. Napolitano, Aaron J. Romanowsky, L. Coccato, M. Capaccioli, N. G. Douglas, E. Noordermeer, O. Gerhard, M. Arnaboldi, F. De Lorenzi, K. Kuijken, M. R. Merrifield, E. O'Sullivan, A. Cortesi, P. Das, K. C. Freeman

Faculty Publications

We present new Planetary Nebula Spectrograph observations of the ordinary elliptical galaxy NGC 4494, resulting in positions and velocities of 255 planetary nebulae out to seven effective radii (25 kpc). We also present new wide-field surface photometry from MMT/Megacam, and long-slit stellar kinematics from VLT/FORS2. The spatial and kinematical distributions of the planetary nebulae agree with the field stars in the region of overlap. The mean rotation is relatively low, with a possible kinematic axis twist outside 1Re. The velocity dispersion profile declines with radius, though not very steeply, down to ∼70 km s−1 at the last data point. We …

Probing The 2d Kinematic Structure Of Early-Type Galaxies Out To 3 Effective Radii, R. N. Proctor, D. A. Forbes, J. P. Brodie, Aaron J. Romanowsky, J. Strader, M. Spolaor, J. T. Mendel, L. Spitler

Faculty Publications

We detail an innovative new technique for measuring the two-dimensional (2D) velocity moments (rotation velocity, velocity dispersion and Gauss–Hermite coefficients h3 and h4) of the stellar populations of galaxy haloes using spectra from Keck DEIMOS (Deep Imaging Multi-Object Spectrograph) multi-object spectroscopic observations. The data are used to reconstruct 2D rotation velocity maps. Here we present data for five nearby early-type galaxies to ∼three effective radii. We provide significant insights into the global kinematic structure of these galaxies, and challenge the accepted morphological classification in several cases. We show that between one and three effective radii the velocity dispersion declines very …

El Análisis De La Consigna Argumentativa En La Calidad Del Discurso Y En El Aprendizaje De Las Ciencias Naturales, Sandra Gilabert Medina, Merce Garcia-Mila Palaudarias, Mark Felton

Faculty Publications

En los últimos años nuestras aulas de ciencias han incorporado la argumentación como una herramienta para promover la construcción de conocimiento. Un aspecto generalmente olvidado en dichas intervenciones, así como en las investigaciones de las cuales derivan, es el análisis del impacto que el objetivo de la argumentación tiene en la actividad argumentativa desplegada en las aulas. En el discurso argumentativo distinguimos dos tipos de actividad: la oposición y la deliberación. En la actividad de oposición el objetivo es mantener el punto de vista y debilitar las alternativas, mientras que en la actividad de deliberación el objetivo es consensuar un …

Conceptualizing Aggression, Noah Weisbord

Faculty Publications

The special working group tasked by the International Criminal Court’s Assembly of States Parties to define the supreme international crime, the crime of aggression, has produced a breakthrough draft definition.

This paper analyzes the key concepts that make up the emerging definition of the crime of aggression by developing and applying a future-oriented methodology that brings together scenario planning and grounded theory. It proposes modifications and interpretations of the constituent concepts of the crime of aggression intended to make the definition sociologically relevant today and in the foreseeable future.

Comment On "Generation Of Cold Low Divergent Atomic Beam Of Indium By Laser Ablation", A. Denning, A. Booth, S. Lee, M. Amonson, Scott D. Bergeson

Faculty Publications

We present measurements of the velocity distribution of calcium atoms in an atomic beam generated using a dual-stage laser back-ablation apparatus. Distributions are measured using a velocity selective Doppler time-of-flight technique. They are Boltzmann-like with rms velocities corresponding to temperatures above the melting point for calcium. Contrary to a recent report in the literature, this method does not generate a subthermal atomic beam.

Tpack Development In Science Teaching: Measuring The Tpack Confidence Of Inservice Science Teachers, Charles R. Graham, Nicolette Burgoyne, Pamela Cantrell, Leigh Smith, Larry St. Clair, Ron Harris

Faculty Publications

Knowledge related to the effective use of educational technologies has become widely recognized as an important aspect of an educator’s knowledge-base for the 21st Century (ISTE, 2008; National Council for Accreditation of Teacher Education, 1997; Partnership for 21st Century Skills, 2003). Early in the history of educational technology, educators were taught in technology classes that focused primarily on technology skills independent from the pedagogical or content courses (Graham, Culatta, Pratt, & West, 2004; Hargrave & Hsu, 2000; Willis & Mehlinger, 1996). Educators soon recognized that technology skills alone did not serve them well because one could know how to operate …

The Malina Oceanographic Expedition: How Do Changes In Ice Cover, Permafrost And Uv Radiation Impact On Biodiversity And Biogeochemical Fluxes In The Arctic Ocean?, Phillippe Massicotte, Rainer Amon, David Antoine, Philippe Archambault, Sergio Balzano, Simon Bélanger, Ronald Benner, Dominique Boeuf, Annick Bricaud, Flavienne Bruyant, Gwenaëlle Chaillou, Malik Malik, Bruno Charrière, Jing Chen, Hervé Claustre, Pierre Coupel, Nicole Delsaut, David Doxaran, Et. Al.

Faculty Publications

The MALINA oceanographic campaign was conducted during summer 2009 to investigate the carbon stocks and the processes controlling the carbon fluxes in the Mackenzie River estuary and the Beaufort Sea. During the campaign, an extensive suite of physical, chemical and biological variables was measured across seven shelf–basin transects (south-north) to capture the meridional gradient between the estuary and the open ocean. Key variables such as temperature, absolute salinity, radiance, irradiance, nutrient concentrations, chlorophyll-a concentration, bacteria, phytoplankton and zooplankton abundance and taxonomy, and carbon stocks and fluxes were routinely measured onboard the Canadian research icebreaker CCGS Amundsen and from a barge …

Religion And Academic Achievement Among Adolescents, Benjamin Mckune, John P. Hoffmann

Faculty Publications

In this article, we examine the association between religiosity and academic achievement among adolescents. Recent research demonstrates a positive association between religiosity and academic success. However, some studies show that this association is due to family and community factors; for example, variation in levels of family capital among religious affiliates could explain it. Yet whether religious factors affect academic achievement among adolescents might also be due to the concordance or discordance of religiosity between parents and their children. Using data for two years from the National Longitudinal Study of Adolescent Health, we examine the associationbetween adolescents‘ religiosity, parents‘ religiosity, and …

Measurement And Simulation Of Laser-Induced Fluorescence From Nonequilibrium Ultracold Neutral Plasmas, A. Denning, Scott D. Bergeson, F. Robicheaux

Faculty Publications

We report measurements and simulations of laser-induced fluorescence in ultracold neutral plasmas. We focus on the earliest times, when the plasma equilibrium is evolving and before the plasma expands. In the simulation, the ions interact via the Yukawa potential in a small cell with wrapped boundary conditions. We solve the optical Bloch equation for each ion in the simulation as a function of time. Both the simulation and experiment show the initial increase in ion fluorescence, disorder-induced heating, and coherent oscillation of the rms ion velocity. Detailed modeling of the fluorescence signal makes it possible to use fluorescence spectroscopy to …

Author Entropy Vs. File Size In The Gnome Suite Of Applications, Jason R. Casebolt, Daniel P. Delorey, Charles D. Knutson, Jonathan Krein, Alexander C. Maclean

Faculty Publications

We present the results of a study in which author entropy was used to characterize author contributions per file. Our analysis reveals three patterns: banding in the data, uneven distribution of data across bands, and file size dependent distributions within bands. Our re- sults suggest that when two authors contribute to a file, large files are more likely to have a dominant author than smaller files.

Psoda: Open Source Phylogenetic Search And Dna Analysis, Mark J. Clement, Quinn O. Snell, Kenneth Sundberg

Faculty Publications

PSODA is an open source (GPL v2) sequence analysis package that implements sequence alignment using biochemical properties, phylogeny search with parsimony or maximum likelihood criteria and selection detection using biochemical properties (TreeSAAP ). PSODA is compatible with PAUP and the search algorithms are competitive with those in PAUP. PSODA also adds a basic scripting language to the PAUP block, making it possible to easily create advanced meta-searches. Because PSODA is open-source, we have also been able to easily add in advanced search techniques and characterize the benefits of various optimizations. PSODA is available for Macintosh OS X, Windows, and Linux.

Insights From Research On Distance Education Learners, Learning, And Learner Support, Richard E. West

Faculty Publications

This article reviews the key ideas related to increasing student learning and support described in selected chapters from the second edition of the Handbook of Distance Education (Moore 2007). These chapters described research findings related to the impact of distance education on learners in general (student autonomy, cognition, social learning, and satisfaction), as well as specific subgroups of distance students and instructors (K-12, female, and disabled students as well as academic advising and library services). This article concludes with brief recommendations for future research in each of these areas.

Personal Epistemologies And The Learning Paradox In Teacher Education: A Neglected Dilemma, Elana Joram, Carmen Montecinos

Faculty Publications

In this chapter, we discuss the role that personal epistemologies play in teacher education, particularly with respect to the potential problems and roadblocks they may present. We suggest that epistemological beliefs govern the kind of knowledge that preservice teachers consider to be legitimate and worthwhile learning in their programs, regulate the ways in which they make choices among competing knowledge claims and justify their own choices. A body of research has examined epistemic cognition as a dimension of the cognitive growth that occurs during the college years (e.g., Baxter- Magolda, 2002; King & Kitchener, 2002; Perry, 1970), and recently, the …

A Working Conference On Students With Disabilities In Stem Coursework And Careers, Audrey C. Rule, Greg P. Stefanich, Charlotte W. Haselhuhn, Belinda Peiffer

Faculty Publications

Background: Few teachers and special education specialists are aware of the materials and resources available to support science; technology; engineering; and mathematics instruction for the scattered and isolated 3000 students with sensory and motor disabilities in Iowa's K-12 schools. Additionally; faculty at many community colleges and regent institutions are not aware of possible accommodations for their students with disabilities who have interests in pursuing STEM careers. Unfortunately; this often leads to discouragement and lack of success for students with motor or sensory disabilities. This conference brings together experts and conference attendees involved in instruction; support; or transitions for these students …

Hardware Accelerated Sequence Alignment With Traceback, Scott Lloyd, Quinn O. Snell

Faculty Publications

Biological sequence alignment is an essential tool used in molecular biology and biomedical applications. The growing volume of genetic data and the complexity of sequence alignment present a challenge in obtaining alignment results in a timely manner. Known methods to accelerate alignment on reconfigurable hardware only address sequence comparison, limit the sequence length, or exhibit memory and I/O bottlenecks. A space-efficient, global sequence alignment algorithm and architecture is presented that accelerates the forward scan and traceback in hardware without memory and I/O limitations. With 256 processing elements in FPGA technology, a performance gain over 300 times that of a desktop …

Effective Medium Theory, Rough Surfaces, And Moth’S Eyes, David D. Allred, Zephne Larsen, Joseph Muhlestein, R. Steven Turley, Anthony Willey

Faculty Publications

Optics in the extreme ultraviolet (XUV) have important applications in microelectronics, microscopy, space physics, and in imaging plasmas. Because of the short wavelengths involved in these applications, it is critical to account for interfacial roughness to accurately predict the reflection and absorption of XUV optics. This paper examines two possible effects of roughness on optical absorption, non-specular reflection and enhanced transmission and compares these to measured experimental data on a rough Y2O3 thin film.

Diagramming Tpack In Practice: Using An Elaborated Model Of The Tpack Framework To Analyze And Depict Teacher Knowledge, Suzy Cox, Charles R. Graham

Faculty Publications

The introduction of the TPACK model by Mishra and Koehler (2006) has had a profound impact on the field of educational technology. It has inspired teachers, teacher educators, and educational technologists to reevaluate their knowledge and use of technology in the classroom. While Koehler, Mishra, and others have attempted to define and measure TPACK, the framework is not yet fully understood (Angeli & Valanides, 2009). Thus far, the explanations of technological pedagogical content knowledge and its associated constructs that have been provided are not clear enough for researchers to agree on what is and is not an example of each …

An Examination Of Family Communication Within The Core And Balance Model Of Family Leisure Functioning, Kevin M. Smith, Patti A. Freeman, Ramon B. Zabriskie

Faculty Publications

The purpose of this study was to examine family communication within the core and balance model of family leisure functioning. The study was conducted from a youth perspective of family leisure and family functioning. The sample consisted of youth (N= 95) aged 11 – 17 from 25 different states in the United States. Path analyses indicated that family communication mediated a positive relationship between family leisure variables and family functioning variables. Implications and recommendations are discussed. The addition of communication in the Core and Balance Model is recommended.

Spin Dynamics For Wave Packets In Rashba Systems, Bailey C. Hsu, Jean F. Van Huele

Faculty Publications

We explore spin dynamics for localized wave packets in Rashba systems using spin quantum propagators. We derive exact (one-dimensional) and approximate (two-dimensional) analytic expressions for the propagators and apply them to Gaussian wave packets to obtain localized solutions of systems manifesting Rashba interactions. We observe and describe the evolution of the wave packets. We identify characteristic structures in the wave-packet evolution and look for features with specific spintronics applications such as spin separation and spin accumulation. We discuss the relative importance of those features as a function of the Rashba coupling strength α and the width of the wave packet …

Understanding Generalist Function, F. Matthew Mihelic

Faculty Publications

A major concern in dealing with multi-agent complex adaptive systems is the understanding of how such systems build order in the midst of an otherwise chaotic universe. The ordering principles of such systems that are found at the biological level can be applied to better understanding human organizations, and can also be used to develop or modify highly complex intelligent agent software systems for greater efficacy. This paper describes the theoretical mechanism of how huge multi-agent complex adaptive systems overcome the exponential increases in entropy that would otherwise cause system collapse, through the use of agents that function to maintain …