Physical Sciences and Mathematics Commons^™

Project-Based Collaborative Innovation For The Igeneration, James Gerry, Carl Heine

Carl Heine

Social media provides powerful opportunities to create new learning communities. Online, project-based activities reach today's iGen students in ways they learn best, maximizing interaction and individualization through the use of free Web technologies such as CoolHub.IMSA. Discover ways to use networing tools to transform teaching and learning at your school.

Topological Data Analysis Of Biological Aggregation Models, Chad M. Topaz, Lori Ziegelmeier, Tom Halverson

Chad M. Topaz

Detection And Counting Of Micro Scale Particles And Pollen Using A Multi-Aperture Coulter Counter, Ashish Jagtiani, Jiang Zhe, Jun Hu, Joan Carletta

Dr. Jiang Zhe

We demonstrate a high throughput, all-electronic Coulter-type sensor with four sensing microapertures to detect and count micro-scale particles. Four particle samples are utilized for this study: polymethacrylate particles 40 µm and 20 µm in diameter, Juniper Scopulorum (Rocky Mountain Juniper) pollen and Cottonwood pollen particles. The two types of pollen particles are roughly 20 µm in diameter. The particles are mixed with deionized water and forced to pass through the microapertures. Voltage pulses across all four apertures are recorded and analysed. Results demonstrate that the sensor can detect and count particles through its four sensing apertures simultaneously. Thus, the counting …

Welcome To The Machine: Privacy And Workplace Implications Of Predictive Analytics, Robert Sprague

Robert Sprague

Inhomogeneous Spin-Dependent Spatial Distribution Of Excitons In An Integrated Magnetic-Multiple Quantum Wells System., Ahmed Abdelrahman, Hansoon Kang, Mikhail Vasiliev, Kamal Alameh, Yong Lee

Mikhail Vasiliev

We report on the observation of an inhomogeneous spin-dependent spatial distribution of heavy-hole excitons generated by a localized inhomogeneous magnetic weak eld. An exciton energy splitting is observed between the spin-up and spin-down states with an energy gap as a function of the magnetic field

Annealing Behaviour And Crystal Structure Of Rf-Sputtered Bi-Substituted Dysprosium Iron-Garnet Films Having Excess Co-Sputtered Bi-Oxide Content, Mikhail Vasiliev, Mohammad Nur-E-Alam, Kamal Alameh, P Premchander, Yong Lee, V Kotov, Y Lee

Mikhail Vasiliev

We investigate the magneto-optic properties, crystal structure and annealing behaviour of nano-composite media with record-high magneto-optic quality exceeding the levels reported so far in sputtered iron-garnet films. Bi-substituted dysprosium–gallium iron-garnet films having excess bismuth oxide content are deposited using RF co-sputtering, and a range of garnet materials are crystallized using conventional oven-annealing processes. We report, for the first time ever, the results of optimization of thermal processing regimes for various high-performance magneto-optic iron-garnet compositions synthesized and describe the evolution of the optical and magneto-optical properties of garnet-Bi-oxide composite-material films occurring during the annealing processes. The crystallization temperature boundaries of the …

Magnetic Micro-Trapping Of Excitons In Multiple Quantum Wells System Using Local Field Minima, Ahmed Abdelrahman, Hansoon Kang, Mikhail Vasiliev, Kamal Alameh

Mikhail Vasiliev

We propose a simple method to create a local magnetic field minima for the magnetic trapping and confining of excitons. We observe an enhanced spatially resolved photoluminescence of the optically active heavy-hole excitons concentrated at the confining region in a multiple quantum wells system. We draw the attention to consider the proposed trapping mechanism as an approach to reach the Bose-Einstein condensate limit of excitons.

Highly Bismuth-Substituted, Record-Performance Magneto-Optic Garnet Materials With Low Coercivity For Applications In Integrated Optics, Photonic Crystals, Imaging And Sensing, Mohammad Nur E Alam, Mikhail Vasiliev, Viacheslav A Kotov, Kamal Alameh

Mikhail Vasiliev

We report on the fabrication of radio frequency (RF) sputtered Bi-substituted lutetium iron garnet films doped with aluminum and the results of adjusting the properties of these films by means of co-sputtering deposition using an additional bismuth oxide target. Very attractive optical, magnetic and magneto-optical properties are achieved in these new magneto-optic materials. The high-performance magnetically-soft thin-film engineered materials synthesized have a wide range of potential applications in next-generation integrated optics, magneto-photonics and magnetic field sensors.

A New Laboratory For Mm-/Sub-Mm-Wave Characterization Of Cosmic Dust Analogs, Thushara Perera, Lunjun Liu, '17

Thushara A. Perera

No abstract provided.

Detection And Quantification Of Lead And Copper In Firearm Harvested Ground Venison Intended For Human Consumption, Given Harper, Manori Perera, Christopher Crown, '17

Given Harper

No abstract provided.

A Computational Study Of Icart's Function, Andrew Shallue, Thomas Simmons, '15

Andrew Shallue

No abstract provided.

Delving Deeper In To Space: Observing Areas Surrounded By Interstellar Dust, Thushara Perera, Rebecca Roesner, Beatrice Koka, '16, Ryan Schonert, '16

Thushara A. Perera

No abstract provided.

A Novel Peptide Inhibitor Of The Polymerization Of Deoxygenated Sickle Cell Hemoglobin, Brian Brennan, Timothy Broederdorf, '15

Brian B. Brennan

No abstract provided.

Developing Scientific Literacy In Introductory Laboratory Courses: A Model For Course Design And Assessment, Benjamin Surpless, Bushey Michelle, Mark Halx

Benjamin E Surpless

Although science educators at all levels have focused on teaching students scientific literacy for nearly five decades, studies indicate that the average student remains far from scientifically literate. To address this issue at the local level, faculty at Trinity University, in San Antonio, Texas, significantly revised the curriculum of an existing introductory physical geology laboratory course. The course, which satisfies general education requirements at Trinity, was revised to provide students learning opportunities in a scientific process context as part of a new science literacy initiative. This effort was spurred by general dissatisfaction with the existing curricular structure of the course …

Modern Strain Localization In The Central Walker Lane, Western United States: Implications For The Evolution Of Intraplate Deformation In Transtensional Settings, Benjamin Surpless

Benjamin E Surpless

Approximately 25% of the differential motion between the Pacific and North American plates occurs in the Walker Lane, a zone of dextral motion within the western margin of the Basin and Range province. At the latitude of Lake Tahoe, the central Walker Lane has been considered a zone of transtension, with strain accommodated by dip-slip, strike-slip, and oblique-slip faults. Geologic data indicate that extension and strike-slip motion are partitioned across the central Walker Lane, with dip-slip motion resulting in E–W to ESE–WNW extension along the present-day western margin of the central Walker Lane since approximately 15 Ma, and dextral strike-slip …

Volcanism And Tectonics: An Exploration Of Volcanoes And Volcanic Deposits Using Google Earth, Benjamin Surpless

Benjamin E Surpless

No abstract provided.

Analytical Models For Atomic Friction, Yalin Dong, Ajay Vadakkepatt, Ashlie Martini

Dr. Yalin Dong

In this methods article, we describe application of Prandtl–Tomlinson models and their extensions to interpret dry atomic-scale friction. The goal is to provide a practical overview of how to use these models to study frictional phenomena. We begin with the fundamental equations and build on them step-by-step—from the simple quasistatic one-spring, one-mass model for predicting transitions between friction regimes to the two-dimensional and multi-atom models for describing the effect of contact area. The intention is to bridge the gap between theoretical analysis, numerical implementation, and predicted physical phenomena. In the process, we provide an introductory manual with example computer programs …

Attitudes And Perspectives Of Front-Line Workers In Environmental Policy: A Case Study Of Ohio Epa And Wisconsin Dnr, Sara Rinfret, Michelle Pautz

Michelle Pautz

This research is an effort to focus on frontline regulators with the Ohio Environmental Protection Agency and Wisconsin Department of Natural Resources. An online survey was conducted of frontline regulators in these agencies to explore their knowledge, attitudes, and perspectives on policy implementation. More specifically, we endeavor to answer how frontline workers implement environmental policy. To analyze these data, we use two categorizations of factors (knowledge and attitudes, and contextual factors) offered by May and Winter (2009) to examine what influences the decision making of frontline regulators in their regulatory interactions. We find that despite common presumptions of adversarialism in …

Zwitteration Of Dextran: A Facile Route To Integrate Antifouling, Switchability And Optical Transparency Into Natural Polymers, Bin Cao, Linlin Li, Haiyan Wu, Qiong Tang, Bingbing Sun, He Dong, Jiang Zhe, Gang Cheng

Dr. Jiang Zhe

This communication reports a facile method for zwitteration of dextran with carboxybetaine (CB), which integrates superior antifouling properties, switchability between zwitterionic and cationic forms, as well as enhanced optical transparency into one polysaccharide material. This study provides a new avenue for generating multifunctional zwitterionic CB materials in situ.

Water-Smart Growth: Integrating Water Management And Land Use Planning, Enjie Li

Enjie Li

Water and urban growth are inextricably interconnected, particularly in arid regions. Urban growth and water management have generated multi-dimensional conflicts. Growing cities that seek to quench their continuously increasing thirst with limited available water resources often have adverse impacts on the environment or region from which the water is drawn. Given that land use planning is an effective tool to control and manage urban growth and it has direct influence on urban water management, a holistic land-water planning approach is needed to cope with rapid growth and water scarcity in the arid western United States. However, this land-water planning approach …

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 …

Challenges Associated With Space Weather Analysis And Prediction, John Lanicci

John M Lanicci

The term “space weather” is typically used to describe environmental conditions in the region extending from the sun’s surface, through the interplanetary medium, to the earth’s magnetic field and upper atmosphere, with a focus on those conditions that can affect the earth, its technological systems, and population. Space weather conditions are monitored continuously by a number of agencies around the world. These agencies use both satellite- and ground-based measurements to build analyses and employ predictive models that form the basis for impacts-based products dealing with myriad users in satellite operations, the utility industry, aviation, and satellite-based communications, to name a …

Leukoaraiosis Predicts Poor 90-Day Outcome After Acute Large Cerebral Artery Occlusion, Nils Henninger, Eugene Lin, Stephen Baker, Ajay Wakhloo, Deepak Takhtani, Majaz Moonis

Nils Henninger

BACKGROUND: To date limited information regarding outcome-modifying factors in patients with acute intracranial large artery occlusion (ILAO) in the anterior circulation is available. Leukoaraiosis (LA) is a common finding among patients with ischemic stroke and has been associated with poor post-stroke outcomes but its association with ILAO remains poorly characterized. This study sought to clarify the contribution of baseline LA and other common risk factors to 90-day outcome (modified Rankin Scale, mRS) after stroke due to acute anterior circulation ILAO. METHODS: We retrospectively analyzed 1,153 consecutive patients with imaging-confirmed ischemic stroke during a 4-year period (2007-2010) at a single academic …

Neurological And Cardiovascular Outcomes After Cardiac Arrest At Six Regional Interventional Cardiology Centers In The United States 2007-2011, David Seder, Nainesh Patel, J Mcpherson, P Mcmullen, K Kern, B Unger, J Browning, Sudip Nanda, M Hacobian, M Kelley, N Nielsen, M Mooney

Nainesh C Patel MD

No abstract provided.

Geriatric Experience Following Cardiac Arrest At Six Interventional Cardiology Centers In The United States 2007-2011, David Seder, Nainesh Patel, John Mcpherson, Paul Mcmullen, Karl Kern, Barbara Unger, J Browning, Sudip Nanda, Melkon Hacobian, Michael Kelley, Niklas Nielsen, Michael Mooney

Nainesh C Patel MD

No abstract provided.

The Large Intracellular Loop Of Hzip4 Is An Intrinsically Disordered Zinc Binding Domain, Robert Dempski, Elizabeth Bafaro, Sagar Antala, Tuong-Vi Nguyen, Stephen Dzul, Brian Doyon, Timothy Stemmler

Robert E. Dempski

The human (h) ZIP4 transporter is a plasma membrane protein which functions to increase the cytosolic concentration of zinc. hZIP4 transports zinc into intestinal cells and therefore has a central role in the absorption of dietary zinc. hZIP4 has eight transmembrane domains and encodes a large intracellular loop between transmembrane domains III and IV, M3M4. Previously, it has been postulated that this domain regulates hZIP4 levels in the plasma membrane in a zinc-dependent manner. The objective of this research was to examine the zinc binding properties of the large intracellular loop of hZIP4. Therefore, we have recombinantly expressed and purified …

Crowdsourced Earthquake Early Warning, Sarah Minson, Benjamin Brooks, Craig Glennie, Jessica Murray, John Langbein, Susan Owen, Thomas Heaton, Robert Iannucci, Darren Hauser

Robert A Iannucci

Earthquake early warning (EEW) can reduce harm to people and infrastructure from earthquakes and tsunamis, but it has not been implemented in most high earthquake-risk regions because of prohibitive cost. Common consumer devices such as smartphones contain low-cost versions of the sensors used in EEW. Although less accurate than scientific-grade instruments, these sensors are globally ubiquitous. Through controlled tests of consumer devices, simulation of an Mw (moment magnitude) 7 earthquake on California’s Hayward fault, and real data from the Mw 9 Tohoku-oki earthquake, we demonstrate that EEW could be achieved via crowdsourcing.

Total Positivity For A Class Of Non-Exchangeable Copulas, Roy Cerqueti, Claudio Lupi

Claudio Lupi

Theory Identity: A Machine-Learning Approach, Kai Larsen, Dirk Hovorka, Jevin West, James Birt, James Pfaff, Trevor Chambers, Zebula Sampedro, Nick Zager, Bruce Vanstone

Bruce Vanstone

Theory identity is a fundamental problem for researchers seeking to determine theory quality, create theory ontologies and taxonomies, or perform focused theory-specific reviews and meta-analyses. We demonstrate a novel machine-learning approach to theory identification based on citation data and article features. The multi-disciplinary ecosystem of articles which cite a theory's originating paper is created and refined into the network of papers predicted to contribute to, and thus identify, a specific theory. We provide a 'proof-of-concept' for a highly-cited theory. Implications for crossdisciplinary theory integration and the identification of theories for a rapidly expanding scientific literature are discussed.

Isolation Of Thymol From Carom Seeds, Ram Mohan, Leonard Onsen

Ram S. Mohan

A simple protocol for the isolation and characterization of thymol from Trachyspermum ammi, commonly known as Bishop’s weed or carom seed, is reported. Carom seeds are commonly used in Indian cooking as a digestive aid, to treat stomach pain, and for their carminative properties. The protocol, developed as an experiment for introductory organic chemistry laboratories, provides instruction in natural product isolation, chromatographic techniques, acid-base concepts and NMR spectroscopy.