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Articles 143221 - 143250 of 302619

Full-Text Articles in Physical Sciences and Mathematics

(U-Th)/He Chronologic Constraints On Secondary Fe-Oxide Mineralization In Southwestern New Mexico, Mike Channer, Alexis Ault Apr 2015

(U-Th)/He Chronologic Constraints On Secondary Fe-Oxide Mineralization In Southwestern New Mexico, Mike Channer, Alexis Ault

Mike Channer

Temporal constraints on fluid flow, mineralization, and brittle deformation are important for understanding a variety of upper-crustal processes. However, limited radioisotopic methods exist to directly date these processes. Hematite commonly co-precipitates with economically valuable mineral phases in hydrothermal ore deposits, such as copper, uranium, gold, and other rare-earth elements, and occurs in fracture systems and faults. Hematite is amenable to (U-Th)/He dating, and we will apply this method to two case studies in the Rio Grande rift, New Mexico. First, a suite of millimeter-thick hematite- and turgite-coated fracture surfaces cross-cut an ~54-60 Ma porphyritic rhyolite near Lordsburg in southwest New …

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Observations Of Mesospheric Gravity Waves Over The Andes, Jonathan Pugmire Apr 2015

Observations Of Mesospheric Gravity Waves Over The Andes, Jonathan Pugmire

Jonathan Pugmire

Focusing on data from an imager and the SABER instrument aboard the TIMED satellite temperature variances are determined to quantify small-scale gravity waves. IDL software was used to extract all the temperature profile measurements that were measured by SABER within a limited geographical area, centered on our ground-based optical imager at Cerro Pachon, Chile (30.3°S, 70.7°S). Large-scale tidal waves, with wavenumbers 0-6, were removed from each profile revealing the gravity wave perturbations. Temperature variances reveal possible increased wave activity due to mountain waves. Mountain waves in the mesosphere are a relatively unexplored field in aeronomy. They are generated predominantly in …

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Data In The Sciences At Colby College, A Case Study, Susan Westerberg Cole Apr 2015

Data In The Sciences At Colby College, A Case Study, Susan Westerberg Cole

Susan Westerberg Cole

A sabbatical project looked at the research data needs of science faculty at a small liberal arts college in order to determine potential library support services. I concluded that support needs to come from multiple campus units. This study highlighted the value of personal interviews to discover actual needs that had been unanticipated.

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Reagent Pencils: A New Technique For Solvent-Free Deposition Of Reagents Onto Paper-Based Microfluidic Devices, Haydn T. Mitchell, Isabelle C. Noxon, Cory A. Chaplan, Samantha J. Carlton, Cheyenne H. Liu, Kirsten A. Ganaja, Nathaniel W. Martinez, Chad Immoos, Philip Costanzo, Andres W. Martinez Apr 2015

Reagent Pencils: A New Technique For Solvent-Free Deposition Of Reagents Onto Paper-Based Microfluidic Devices, Haydn T. Mitchell, Isabelle C. Noxon, Cory A. Chaplan, Samantha J. Carlton, Cheyenne H. Liu, Kirsten A. Ganaja, Nathaniel W. Martinez, Chad Immoos, Philip Costanzo, Andres W. Martinez

Chemistry and Biochemistry

Custom-made pencils containing reagents dispersed in a solid matrix were developed to enable rapid and solvent-free deposition of reagents onto membrane-based fluidic devices. The technique is as simple as drawing with the reagent pencils on a device. When aqueous samples are added to the device, the reagents dissolve from the pencil matrix and become available to react with analytes in the sample. Colorimetric glucose assays conducted on devices prepared using reagent pencils had comparable accuracy and precision to assays conducted on conventional devices prepared with reagents deposited from solution. Most importantly, sensitive reagents, such as enzymes, are stable in the …

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Observation Of Interlayer Phonon Modes In Van Der Waals Heterostructures, C. H. Lui, Zhipeng Ye, Chao Ji, Kuan-Chang Chiu, Cheng-Tse Chou, Trond I. Andersen, Casie Means-Shively, Heidi Anderson, Jenn-Ming Wu, Tim Kidd, Yi-Hsien Lee, Rui He Apr 2015

Observation Of Interlayer Phonon Modes In Van Der Waals Heterostructures, C. H. Lui, Zhipeng Ye, Chao Ji, Kuan-Chang Chiu, Cheng-Tse Chou, Trond I. Andersen, Casie Means-Shively, Heidi Anderson, Jenn-Ming Wu, Tim Kidd, Yi-Hsien Lee, Rui He

Faculty Publications

We have investigated the vibrational properties of van der Waals heterostructures of monolayer transition metal dichalcogenides (TMDs), specifically MoS2/WSe2 and MoSe2/MoS2 heterobilayers and twisted MoS2 bilayers, by means of ultralow-frequency Raman spectroscopy. We discovered Raman features (at 30–40 cm−1) that arise from the layer-breathing mode (LBM) vibration between the two incommensurate TMD monolayers in these structures. The LBM Raman intensity correlates strongly with the suppression of photoluminescence that arises from interlayer charge transfer. The LBM is generated only in bilayer areas with direct layer-layer contact and an atomically clean interface. Its frequency also …

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Structure Of Local Quantum Operations And Classical Communication: Finite Versus Infinite Rounds, Scott M. Cohen Apr 2015

Structure Of Local Quantum Operations And Classical Communication: Finite Versus Infinite Rounds, Scott M. Cohen

Physics Faculty Publications and Presentations

Every measurement that can be implemented by local quantum operations and classical communication (LOCC) using an infinite number of rounds is the limit of a sequence of measurements, where each measurement in the sequence requires only a finite number of rounds. This rather obvious and well-known fact is nonetheless of interest as it shows that these infinite-round measurements can be approximated arbitrarily closely simply by using more and more rounds of communication. Here we demonstrate the perhaps less obvious result that (at least) for bipartite systems, the reverse relationship also holds. Specifically, we show that every finite-round bipartite LOCC measurement …

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Factors That Affect Student Performance Among Ohio Leed Schools: An Examination Of Leed Credit Categories, Ieq Credits And School Typology, Ryan P. Thombs Apr 2015

Factors That Affect Student Performance Among Ohio Leed Schools: An Examination Of Leed Credit Categories, Ieq Credits And School Typology, Ryan P. Thombs

Undergraduate Distinction Papers

This investigation examines the impact that LEED certification had on educational outcomes of K-12 school buildings in the state of Ohio during the 2012-13 academic year. The study focused on three goals. First, the overall credit categories of LEED were tested to determine whether or not they have an impact on educational outcomes, which were measured by the student performance index (SPI). The literature has generally shown that indoor environmental quality has a significant impact on academic performance. Second, the credits that are within the Indoor Environmental Quality (IEQ) category were tested to determine which individual credits had an impact …

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Calibration Of Muon Detector For Coincidence Cathodoluminescence Experiments, Kenneth Zia, Jr Dennison Apr 2015

Calibration Of Muon Detector For Coincidence Cathodoluminescence Experiments, Kenneth Zia, Jr Dennison

Presentations

A muon scintillation detector has been calibrated by measuring the magnitude and angular dependence of high energy cosmic background radiation events. Optimizing dark current as a function of voltage across the photomultiplier tube (PMT) detector was essential for accurate counting of current pulses as narrow as the counts in the PMT. Measurements of the crosssection zenith angle were also optimized by sweeping the detector across the horizon and from the zenith to nadir angle. The detector is now operating within proper Poisson distribution statistics for counting particle experiments, and is ready for the next step in determining coincidence between the …

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Electron Penetration Range For Every Body, Anne Starley, Lisa Montierth Phillipps, Jr Dennison Apr 2015

Electron Penetration Range For Every Body, Anne Starley, Lisa Montierth Phillipps, Jr Dennison

Presentations

The penetration range of an electron into diverse materials can be estimated using an approximation fit as a function of a single parameter, N y, which describes the effective number of valence electrons. This fit is found using the Continuous-Slow Down-Approximation (CSDA), which simplifies the process of estimating an expected penetration range of a given material by applying some of the material’s key characteristics. Using the CSDA, a simple composite analytical formula is created which estimates the range or maximum penetration depth of incident electrons. This formula generates an approximation to the range using the parameter, Nv . The range …

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Architectural Strategy For Digital Platforms: Technological And Organizational Perspectives, Jason Woodard, Joel West Apr 2015

Architectural Strategy For Digital Platforms: Technological And Organizational Perspectives, Jason Woodard, Joel West

C. Jason Woodard

different spatial queries such as kNN query, range query and CNN query. A comprehensive experimental study has been conducted to

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On Empirical Validation Of Compactness Measures For Electoral Redistricting And Its Significance For Application Of Models In The Social Science, Christine Chou, Steven O. Kimbrough, Frederic H. Murphy, John Sullivan-Fedock, C. Jason Woodard Apr 2015

On Empirical Validation Of Compactness Measures For Electoral Redistricting And Its Significance For Application Of Models In The Social Science, Christine Chou, Steven O. Kimbrough, Frederic H. Murphy, John Sullivan-Fedock, C. Jason Woodard

C. Jason Woodard

Use of optimization models in science and policy applications is often problematic because the best available models are very inaccurate representations of the originating problems. Such is the case with electoral districting models, for which there exist no generally accepted measures of compactness, in spite of many proposals and much analytical study. This article reports on an experimental investigation of subjective judgments of compactness for electoral districts. The experiment draws on a unique database of 116 distinct, legally valid districting plans for the Philadelphia City Council, discovered with evolutionary computation. Subjects in the experiment displayed, in the aggregate, remarkable agreement …

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Microblogging For Engaged Teaching And Learning, Thomas Menkhoff, Kok Siew Benjamin Gan, Charles Jason Woodard, Yue Wah Chay Apr 2015

Microblogging For Engaged Teaching And Learning, Thomas Menkhoff, Kok Siew Benjamin Gan, Charles Jason Woodard, Yue Wah Chay

C. Jason Woodard

In this paper, we report how we put a newly developed Twitter application to work in the context of a Knowledge Management course taught at the Singapore Management University (SMU) allowing students to post and view relevant tweets in an organized manner for the benefit of collaborative class discussions and learning. Innovative elements of the ongoing project include the explorative usage of social media such as Twitter in the higher education context, student participation in providing initial evidence and qualitative feedback that tweeting is pedagogically meaningful and a newly built-in feature which can resolve tweeting challenges which occurred in class …

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Architectural Control And Value Migration In Platform Industries, C. Jason Woodard Apr 2015

Architectural Control And Value Migration In Platform Industries, C. Jason Woodard

C. Jason Woodard

carry some pre-computation information of each region. We also propose multiple client-side algorithms to facilitate the processing of

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Feature Aligned 3d Mesh Morphing, Sabin Timalsena Apr 2015

Feature Aligned 3d Mesh Morphing, Sabin Timalsena

Research Horizons Day Posters

No abstract provided.

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Using Earth Observations To Map And Model The Spread Of Invasive Asiatic Bush Honeysuckle On The Cumberland Plateau, Daryl Ann Winstead, Brandie Stringer, Michael Logsdon Apr 2015

Using Earth Observations To Map And Model The Spread Of Invasive Asiatic Bush Honeysuckle On The Cumberland Plateau, Daryl Ann Winstead, Brandie Stringer, Michael Logsdon

Research Horizons Day Posters

No abstract provided.

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Retrospective Case Study And Potential Solutions In Regard To The Object Oriented Design Of Charger Through Various Modeling And Analyses, Jesse Moore Apr 2015

Retrospective Case Study And Potential Solutions In Regard To The Object Oriented Design Of Charger Through Various Modeling And Analyses, Jesse Moore

Research Horizons Day Posters

No abstract provided.

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Poincaré Disc: Hear The Whole Mind Sing, Laura Moss, John T. Shrontz Apr 2015

Poincaré Disc: Hear The Whole Mind Sing, Laura Moss, John T. Shrontz

Research Horizons Day Posters

No abstract provided.

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The Phytotoxic Virulence Factor Bcsnod 1 From Botrytis Cinerea, Gnana Sreekar Nidadavolu, Hana Mcfeeters Apr 2015

The Phytotoxic Virulence Factor Bcsnod 1 From Botrytis Cinerea, Gnana Sreekar Nidadavolu, Hana Mcfeeters

Research Horizons Day Posters

No abstract provided.

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Characterizing The Tgf-Lightning Relationship Using Entln, Kareem Omar Apr 2015

Characterizing The Tgf-Lightning Relationship Using Entln, Kareem Omar

Research Horizons Day Posters

No abstract provided.

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Impact Of Desert Dust And Biomass Burning On The Radiative Budget Of The Sahel, Christopher E. Phillips Apr 2015

Impact Of Desert Dust And Biomass Burning On The Radiative Budget Of The Sahel, Christopher E. Phillips

Research Horizons Day Posters

No abstract provided.

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Synthesis And Characterization Study Of Biomimetic Tetradentate Ni Complexes, Nirupama Singh Apr 2015

Synthesis And Characterization Study Of Biomimetic Tetradentate Ni Complexes, Nirupama Singh

Research Horizons Day Posters

No abstract provided.

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Active Site Mimics Of Nickel Superoxide Dismutase, Victoria Grace Snider Apr 2015

Active Site Mimics Of Nickel Superoxide Dismutase, Victoria Grace Snider

Research Horizons Day Posters

No abstract provided.

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Detection Of Power Outages And Recovery Following Disaster Events: The Chilean Earthquake Of 1 April 2014, Tony Cole Apr 2015

Detection Of Power Outages And Recovery Following Disaster Events: The Chilean Earthquake Of 1 April 2014, Tony Cole

Research Horizons Day Posters

No abstract provided.

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High Mannose Binding Lectins - A New Class Of Attractive Antifungals, Tyler Hays Jones Apr 2015

High Mannose Binding Lectins - A New Class Of Attractive Antifungals, Tyler Hays Jones

Research Horizons Day Posters

No abstract provided.

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Analyzing Panama Water Resources Using Radar Topography And Gps, Tim Klug Apr 2015

Analyzing Panama Water Resources Using Radar Topography And Gps, Tim Klug

Research Horizons Day Posters

No abstract provided.

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River Discharge As Affected By Precipitation, Temperature And Soil Characteristics, Susan Kotikot, Kelly Hodgskins Apr 2015

River Discharge As Affected By Precipitation, Temperature And Soil Characteristics, Susan Kotikot, Kelly Hodgskins

Research Horizons Day Posters

No abstract provided.

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Directionally Bounded Utility And The Executive Pay Puzzle, Edoh Y. Amiran, Daniel Andreas Hagen Apr 2015

Directionally Bounded Utility And The Executive Pay Puzzle, Edoh Y. Amiran, Daniel Andreas Hagen

Mathematics Faculty Publications

The pay of CEOs and other top executives has risen disproportionately relative to other earnings. We provide a supply-side explanation based on utility theory using directionally bounded utility functions. As overall income levels have grown, the amount of compensation required to induce top executives to sacrifice a quiet life has risen. We show that directionally bounded utility functions predict a general rise in compensation for stress. More importantly, such utility functions can be used to explain why the CEO pay ratio has risen at an increasing rate, something which other approaches have difficulty explaining.

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Tech In (And Outside) The Classroom: An Aquatic Science Pathway, Rudolph A. Rosen Apr 2015

Tech In (And Outside) The Classroom: An Aquatic Science Pathway, Rudolph A. Rosen

Water Resources Science and Technology Conference Papers and Abstracts

No abstract provided.

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Multivariate Statistical Methodologies Applied In Biomedical Raman Spectroscopy: Assessing The Validity Of Partial Least Squares Regression Using Simulated Model Datasets., Mark Keating Apr 2015

Multivariate Statistical Methodologies Applied In Biomedical Raman Spectroscopy: Assessing The Validity Of Partial Least Squares Regression Using Simulated Model Datasets., Mark Keating

Articles

Raman spectroscopy is fast becoming a valuable analytical tool in a number of biomedical scenarios, most notably disease diagnostics. Importantly, the technique has also shown increasing promise in the assessment of drug interactions on a cellular and subcellular level, particularly when coupled with multivariate statistical analysis. However, an important consideration, both with Raman spectroscopy and the associated statistical methodologies, is the accuracy of these techniques and more specifically the sensitivities which can be achieved and ultimately the limits of detection of the various methods. The purpose of this study is thus the construction of a model simulated data set with …

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Chaotic Scattering In General Relativity, Taylor Hugh Morgan, David Neilsen Apr 2015

Chaotic Scattering In General Relativity, Taylor Hugh Morgan, David Neilsen

Journal of Undergraduate Research

I. Introduction Our research is on the gravitational three-body problem where there are three star-like objects with the only acting force on the objects being gravity. Since the discovery of gravity, many physicists and mathematicians have looked for an analytic solution to the three-body problem including Poincare, Euler, Lagrange, and Jacobi. We now know that there is in fact no analytic solution to this problem. Due to the advent of high performance computing we have discovered much about the chaotic nature1 of this problem and its sensitivity to initial perturbations. For our research we have extended the scope of the …

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