Physical Sciences and Mathematics Commons^™

Multiple Representations And Epistemic Games In Introductory Physics Exam Solutions, Adrienne L. Traxler, Jonathan V. Mahadeo, Daryl Mcpadden, Eric Brewe

Physics Faculty Publications

Previous analysis of common exam questions in introductory physics at Florida International University has revealed differences in the number and type of epistemic games played by students in their solutions. Separated by course format (lecture/lab, lecture/lab/recitation, or inquiry-based), student work also shows varying use of multiple representational tools. Here we examine representation use in more detail to establish a descriptive picture of representation use across multiple instructors and course formats. We then compare these profiles with the epistemic games played by students, asking whether the same epistemic game shows the same pattern of representational tools across course types. We find …

Room-Temperature In-Situ Nanostructure Synthesis Using Electron Beam Irradiation, Mark H. Rümmeli

Special Session 5: Carbon and Oxide Based Nanostructured Materials (2014)

No abstract provided.

Silicon Carbide-Based One-Dimensional Nanostructures Growth: Towards Electronics And Biology Perspectives, Laurence Latu-Romain

Special Session 5: Carbon and Oxide Based Nanostructured Materials (2014)

No abstract provided.

Synthesis And Characterization: Low-Dimensional Carbon Nanomaterials On 3c-Sic/Si, John J. Boeckl, Weijie Lu, Hong Huang, Casey Strope, Li Wang, Neeraj Mishra, Francesca Iacopi

Special Session 5: Carbon and Oxide Based Nanostructured Materials (2014)

No abstract provided.

Field Emission Cathodes Made From Laser Cut Cnt Fibers And Films, Steven B. Fairchild, John Bulmer, Martin Sparkes, John J. Boeckl, Gregory Kozlowski

Special Session 5: Carbon and Oxide Based Nanostructured Materials (2014)

No abstract provided.

H(D)-Induced Nanotunnels Opening At Sic Sub-Surface And Graphene/Sic Grains Etching As A Path To Pahs' Formation In The Universe, Patrick Soukiassian

Special Session 5: Carbon and Oxide Based Nanostructured Materials (2014)

No abstract provided.

Si/Sige Bicmos Microsystems For Microwave And Millimeter-Wave Sensing And Communications, Hermann Schumacher

Physics Seminars

Since the early 1990’s, Silicon-Germanium heterojunction bipolar transistors revolutionized the way we build microwave and millimeter wave systems. Rivaling the once-dominant group III-V semiconductor devices in terms of speed, SiGe technologies also harness the maturity, yield and resulting complexity of Silicon based technology. The presentation will discuss this trend using examples from the author’s research in recent years.

The first example will show how a very inexpensive and „old“ SiGe HBT technology (0.8 μm feature size) was used to implement efficient impulse radio ultra-wideband (IUWB) sensors for vital sign detection and object tracking.

The second example, taken from a recently …

The Higgs Boson: Window On The Big Bang, Jim Brau

Physics Colloquiums

University of Oregon professor James Brau, Ph.D., guides you through the universe of particle physics. Find out about the Large Hadron Collider and the world’s biggest scientific experiment. Understand “dark matter” and “dark energy.” Consider what today’s collider experiments may reveal in the future about the structure, behavior, and history of the universe.

Special Session 8 Introduction: Fundamentals To Applications In 2d Materials, Gregory Kozlowski, Patrick Soukiassian, John J. Boeckl

Special Session 8: Fundamentals to Applications in 2D Materials

Provides an overview of the 2015 Special Session 8 meeting as part of the 11th International Conference on Diffusion in Solids and Liquids, Munich, Germany, June 22-26, 2015.

The Look-Locker Method In Magnetic Resonance Imaging: A Brief, Personal History, David C. Look

Physics Faculty Publications

The “Look-Locker” method of measuring nuclear spin-lattice relaxation times in a single sweep was invented by David C. Look and Donald R. Locker in 1970 and in the last twenty years has become widely used in magnetic resonance imaging. This article is a brief history of the invention from the remembrances of David Look.

Model Of Deep Nonvolcanic Tremor Part I: Ambient And Triggered Tremor, Naum I. Gershenzon, Gust Bambakidis

Physics Faculty Publications

There is evidence of triggering of tremor by seismic waves emanating from distant large earthquakes. The frequency content of triggered and ambient tremor are largely identical, suggesting that tremor does not depend directly on the nature of the source. We show here that the model of plate dynamics developed earlier by us is an appropriate tool for describing the onset of tremor. In the framework of this model, tremor is an internal response of a fault to failure triggered by external disturbances. The model predicts generation of radiation in a frequency range defined by the fault parameters. Other specific features …

Influence Of Small Scale Heterogeneity On Co2 Trapping Processes In Deep Saline Aquifers, Naum I. Gershenzon, Mohamadreza Soltanian, Robert W. Ritzi, David F. Dominic

Physics Faculty Publications

The physical mechanism of CO₂ trapping in porous media by capillary trapping (pore scale) incorporates a number of related processes, i.e. residual trapping, trapping due to hysteresis of the relative permeability, and trapping due to hysteresis of the capillary pressure. Additionally CO₂ may be trapped in heterogeneous media due to difference in capillary pressure entry points for different materials (facies scale). The amount of CO₂ trapped by these processes depends upon a complex system of non-linear and hysteretic relationships including how relative permeability and capillary pressure vary with brine and CO₂ saturation, and upon the spatial …

Surface Effects On Critical Dimensions Of Ferromagnetic Nanoparticles, Vartika Chaudhary

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This work studies surface effects on the critical dimensions of ferromagnetic nanoparticles. Iron nanoparticles with different mean diameters from 5.9 nm to 21.4 nm used in this research were prepared by thermal decomposition of iron pentacarbonyl in the presence of oleic acid/octyl ether at Cambridge University, United Kingdom. Heating response of these ferromagnetic nanoparticles suspended in water were measured experimentally during which same amount of iron nanoparticles and di-ionized water were irradiated by an alternating magnetic field and the increase in temperature of these samples was measured. Heating performance of nanoparticles was described in terms of Specific Absorption Rate (SAR) …

Thermal Properties Of Magnetic Nanoparticles In External Ac Magnetic Field, Anna Beata Lukawska

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This work studies thermal properties of magnetic nanoparticles in an external ac magnetic field. Dried iron and cobalt nanoparticles were prepared by thermal decomposition of iron pentacarbonyl (Fe(CO)5) and dicobalt octacarbonyl (Co2(CO)8), triscobalt nona(carbonyl)chloride (Co3(CO)9Cl), or tetracaobalt dodecacarbonyl (Co4(CO)12) [1]. The samples had different mean diameters: 5.6 - 21.4 nm for iron and 6.5 - 19.4 nm for cobalt. Each sample was exposed to ac magnetic field and the increase in temperature of the sample was measured. Results were analyzed to find the critical diameters for the transitions from multi-domain to single-domain and from single-domain to superparamagnetic regime. The nanoparticles …

Thin Film Growth Of Dielectric Materials By Pulsed Laser Deposition, Jason Christopher Anders

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Thin films of Sr_yCa_1-yZr_1-xTi_xO₃ (SCZT) with x = 0.8, y = 0.01, CaHf_1-xTi_xO₃ (CHT) with x = 0.8, and _xBiScO₃ - (1-x) BaTiO₃ with x = 0.36 (BSBT(36/64)) showing a high permittivity are useful both in capacitor applications. These dielectric thin films with a SrRuO₃ (SRO) conductive bottom electrodes were prepared by using pulsed laser deposition on <100< La_0.3Sr_0.7Al_0.65Ta_0.35O₃ (LSAT) single crystal substrates. In a search of optimal conditions to achieve epitaxially grown SCZT, CHT, …

Ultraviolet Rayleigh Scatter Imaging For Spatial Temperature Profiles In Atmospheric Microdischarges, James E. Caplinger

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Spatially resolved temperature measurements within a microdischarge in atmospheric pressure air have been conducted using Rayleigh scattering of a pulsed ultraviolet laser. Scattering intensity images were used to generate a radial profile of translational temperature, with the analysis based on the ideal gas inverse relationship of temperature and gas density. Rayleigh scattering results were compared to standard optical emission spectral analyses of N2(C3Πu - B3Πg) bands, where the calculated rotational temperatures from emission were in reasonable agreement with the Rayleigh translational temperature profiles.

Curie Temperature Measurement Of Ferromagnetic Nanoparticles By Using Calorimetry, Xing Zhao

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This Thesis studies the relationship between diameter (size) of ferromagnetic nanoparticles and Curie temperature. Iron nanoparticles with different diameters from 5.9 nm to 21.4 nm were prepared by thermal decomposition of iron pentacarbonyl in the presence of oleic acid/octyl ether at Cambridge University, United Kingdom. Heating response of these ferromagnetic nanoparticles suspended in water were measured experimentally during which the same amount of iron nanoparticles and di-ionized water were subjected to an alternating magnetic field and the increase in temperature of these samples was measured. Heating performance of nanoparticles was described by Specific Absorption Rate (SAR). Heating and cooling rate …

Chemical Analysis Of Exhaled Breath By Means Of Terahertz Rotational Spectroscopy, Tianle Guo

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Terahertz spectroscopy, due to the high sensitivity and specificity that it affords, has been incorporated in many fields to aid in the chemical analysis of gases. One potential application is to detect bio-markers in human breath for early diagnosis. Our current aim of our research is to establish a relationship between several chemicals and the glucose levels from human exhaled breath. 20 chemical including Acetone, Carbon monoxide (CO), Methanol were studied. Volunteers' breath samples were processed through a pre-concentration system before being injected into the spectrometer. Initially, a commercial preconcentration system, Entech 7100A, was used. However, due to the limitations …