Physics Commons^™

Characterization Of Physical, Thermal And Spectroscopic Properties Of Biofield Energy Treated P-Phenylenediamine And P-Toluidine, Mahendra Kumar Trivedi, Alice Branton, Dahryn Trivedi, Gopal Nayak, Ragini Singh, Snehasis Jana

Mahendra Kumar Trivedi

Partition-Based Weighted Sum Filters For Image Restoration, Kenneth Barner, Ahmad Sarhan, Russell Hardie

Russell C. Hardie

We develop the concept of partitioning the observation space to build a general class of filters referred to as partition-based weighted sum (PWS) filters. In the general framework, each observation vector is mapped to one of M partitions comprising the observation space, and each partition has an associatedfiltering function. We focus on partitioning the observation space utilizing vector quantization and restrict the filtering function within each partition to be linear. In this formulation, a weighted sum of the observation samples forms the estimate, where the weights are allowed to be unique within eachpartition. The partitions are selected and weights tuned …

1-Butaneboronic Acid Binding To Aeromonas Proteolytica Aminopeptidase:  A Case Of Arrested Development, Carin C. De Paola, Brian Bennett, Richard C. Holz, Dagmar Ringe, Gregory A. Petsko

Richard C. Holz

Hydrolases containing two metal ions connected by a bridging ligand catalyze reactions important in carcinogensis, tissue repair, post-translational modification, control and regulation of biochemical pathways, and protein degradation. The aminopeptidase from Aeromonas proteolytica serves as a paradigm for the study of such bridged bimetallic proteases since its three-dimensional structure is known to very high resolution and its catalytic reaction is amenable to spectroscopic examination. Herein, we report the X-ray crystal structure at 1.9 Å resolution of AAP complexed with 1-butaneboronic acid (BuBA). This structure suggests that this complex represents a snapshot of the proteolytic reaction in an arrested form between …

High Electron Mobility In Free-Standing Gan Substrates, A. Saxler, David Look, Said Elhamri, J. Sizelove, D. Cull, William Mitchel, Michael Callahan, David Bliss, Lionel Bouthillette, Sheng-Qi Wang, C. Sung, Seong-Ju Park, K. Lee

Said Elhamri

High peak electron mobilities were observed in free-standing c-plane GaN substrates. Two layers, a low mobility degenerate layer and a high mobility bulk layer, were present in these samples. The carrier concentrations and mobilities for the layers were extracted using two methods: 1) magnetic field dependent Hall effect analysis and 2) a simple two carrier model with the assumption that one of the layers is degenerate. In addition, measurements were performed after etching away the degenerate layer. The mobility of the bulk layer is found to peak at nearly 8000 cm2/Vs at 60K using the magnetic field dependent Hall effect …

Deep Centers In Semi-Insulating Current Topics In Solid State Physics Fe-Doped Native Gan Substrates Grown By Hydride Vapour Phase Epitaxy, Z-Q. Fang, Bruce Claflin, David Look, Said Elhamri, H. Smith, William Mitchel, D. Hanser, E. Preble, K. Evans

Said Elhamri

Electrical properties, Fe concentration, and deep centers in semi-insulating Fe-doped GaN substrates grown by hydride vapor phase epitaxy (HVPE) were characterized by temperature-dependent Hall-effect measurements, secondary ion mass spectroscopy, and thermally stimulated current (TSC) spectroscopy, Five adjacent samples from a low-[Fe] wafer displayed very high resistivity, dominated by a center at 0,94 eV. At least six traps were observed in the samples by TSC, with trap (0.56-0.60 eV) being dominant. A metastable trap A, at similar to 0.82 eV appeared after white-light illumination at 300 K-A sample from a high-[Fe] wafer displayed a lower resistivity, dominated by a center at …

Video Feature — Banned Books And The Stuart Rose Collection, Robert Brecha, Una Cadegan, John Inglis, Paul Morman

Robert J. Brecha

A faculty panel discussion in two sessions:

Session 1:
The Index: Una Cadegan (history) looks at the current scholarship on the Index of Forbidden Books.
Galileo: Robert Brecha (physics) highlights the banning of Galileo and observational science.

Session 2:
Thomas Aquinas: John Inglis (philosophy) speaks on the banning of Thomas Aquinas's Summa Theologica, the most important book in Catholic intellectual tradition.
Descartes and the Index of Forbidden Books: Paul Morman (history, Distinguished Service Professor) highlights the book by Descartes that he was not allowed to study while a student at UD in the 1960s.

The Effects Of A Weak Alternating Magnetic Field On Glutamic Acid, Carston Work, Ben Pound

Ben Pound

There has been substantial research showing the effects of Extremely Low Frequency Electromagnetic Fields (ELF-EMF) on various properties of liquids, among the most notable being the acidity of a solution. ELF-EMFs have amplitudes typically measured on the scale of microteslas, and have frequencies comparable to the cyclotron frequency of the molecule its ionic form. It is hypothesized that the magnetic field changes the coordination of water, which in turn affects the pH of the solution. This is difficult to measure directly, but it can be measured by adding a molecule that can be detected by IR spectroscopy that is sensitive …

Nuclear War: Hiroshima, Nagasaki, And A Workable Moral Strategy For Achieving And Preserving World Peace, Raymond Wilson

Raymond Wilson

Introduction To Physics I: Laboratory Manual, Robert Coakley

Robert Coakley

No abstract provided.

Introduction To Physics Ii: Laboratory Manual, Robert Coakley

Robert Coakley

No abstract provided.

Three Bosons In One Dimension With Short-Range Interactions: Zero-Range Potentials, Nirav Mehta, James Shepard

Nirav P Mehta

We consider the three-boson problem with δ-function interactions in one spatial dimension. Three different approaches are used to calculate the phase shifts, which we interpret in the context of the effective range expansion, for the scattering of one free particle off a bound pair. We first follow a procedure outlined by McGuire in order to obtain an analytic expression for the desired S-matrix element. This result is then compared to a variational calculation in the adiabatic hyperspherical representation, and to a numerical solution to the momentum-space Faddeev equations. We find excellent agreement with the exact phase shifts, and comment on …

Secondary Electron Emission Of Annealed Graphitic Amorphous Carbon: The Role Of Evolving Bandgap, Jodie Corbridge, Jr Dennison, Neal Nickles

Jodie Corbridge Gillespie

No abstract provided.

Compatibility Of Elastomers With Refrigerant Lubricant Mixtures, Gary Hamed, R. Seiple

Gary R. Hamed

No abstract provided.

Conformal Gravity Holography In Four Dimensions, Robert Mcnees

Robert A McNees IV

We formulate four-dimensional conformal gravity with (anti–)de Sitter boundary conditions that are weaker than Starobinsky boundary conditions, allowing for an asymptotically subleading Rindler term concurrent with a recent model for gravity at large distances. We prove the consistency of the variational principle and derive the holographic response functions. One of them is the conformal gravity version of the Brown–York stress tensor, the other is a “partially massless response”. The on shell action and response functions are finite and do not require holographic renormalization. Finally, we discuss phenomenologically interesting examples, including the most general spherically symmetric solutions and rotating black hole …

Spin Transfer Of Quantum Information Between Majorana Modes And A Resonator, Alexey Kovalev

Alexey Kovalev

No abstract provided.

Terahertz And Infrared Transmission Of An Organic/Inorganic Hybrid Thermoelectronic Material, James Heyman, B. Alebachew, Z. Kaminski, M. Nguyen, N. Coates, J. Urban

James Heyman

No abstract provided.

Shaping Carbon Nanotube Forests For Field Emission, Ben Pound

Ben Pound

No abstract provided.

Writing And Peer Review For Advanced Laboratories: A Proposal, Mark Masters, Timothy Grove, Stevens Amidon

Stevens R. Amidon Dr.

No abstract provided.

Determining Microstructural Features Of A Composite From Effective Properties, Anthony Day, Andrew Mcelroy, Greg Sowa

Anthony Roy Day

No abstract provided.

Proton Transfer In Surface-Stabilized Chiral And Polar Motifs Of Croconic Acid, Axel Enders

Axel Enders

No abstract provided.

Tuning Of Magnetization In Vertical Graphenes By Plasma-Enabled Chemical Conversion Of Organic Precursors With Different Oxygen Content, Zengji Yue

Zengji Yue

Different magnetization in vertical graphenes fabricated by plasma-enabled chemical conversion of organic precursors with various oxygen atom contents and bonding energies was achieved. The graphenes grown from fat-like precursors exhibit magnetization up to 8 emu g−1, whereas the use of sugar-containing precursors results in much lower numbers. A relatively high Curie temperature exceeding 600 K was also demonstrated.

Possible Room-Temperature Ferromagnetism In Hydrogenated Carbon Nanotubes, Adam Friedman, Hyunkyung Chun, Yung Joon Jung, Don Heiman, Evan Glaser, Latika Menon

Latika Menon

We find that ferromagnetism can be induced in carbon nanotubes (CNTs) by introducing hydrogen. Multiwalled CNTs grown inside porous alumina templates contain a large density of defects resulting in significant hydrogen uptake when annealed at high temperatures. This hydrogen incorporation produces H-complex and adatom magnetism which generates a sizable ferromagnetic moment and a Curie temperature near TC=1000  K. We studied the conditions for the incorporation of hydrogen, the temperature-dependent magnetic behavior, and the dependence of the ferromagnetism on the size of the nanotubes.

Self-Assembly Of Helical Ribbons, Yevgeniya V. Zastavker, Neer Asherie, Aleksey Lomakin, Jayanti Pande, Joanne M. Donovan, Joel M. Schnur, George B. Benedek

Yevgeniya V. Zastavker

The self-assembly of helical ribbons is examined in a variety of multicomponent enantiomerically pure systems that contain a bile salt or a nonionic detergent, a phosphatidylcholine or a fatty acid, and a steroid analog of cholesterol. In almost all systems, two different pitch types of helical ribbons are observed: high pitch, with a pitch angle of 54 ± 2°, and low pitch, with a pitch angle of 11 ± 2°. Although the majority of these helices are right-handed, a small proportion of left-handed helices is observed. Additionally, a third type of helical ribbon, with a pitch angle in the range …

Ultrashort Pulse Propagation And Multi-Chromatic Ionization In Dielectrics, Jeremy Gulley

Jeremy R. Gulley

No abstract is currently available.

Viscosity Measurements On Colloidal Dispersions (Nanofluids) For Heat Transfer Applications, Jessica Townsend, Rebecca J. Christianson, D Venerus, J Buongiorno, M A. Kedzierski, Et Al.

Rebecca J. Christianson

This article reports viscosity data on a series of colloidal dispersions collected as part of the International Nanofluid Property Benchmark Exercise (INPBE). Data are reported for seven different fluids that include dispersions of metal-oxide nanoparticles in water, and in synthetic oil. These fluids, which are also referred to as nanofluids, are currently being researched for their potential to function as heat transfer fluids. In a recently published paper from the INPBE study, thermal conductivity data from more than 30 laboratories around the world were reported and analyzed. Here, we examine the influence of particle shape and concentration on the viscosity …

Viscosity Measurements On Colloidal Dispersions (Nanofluids) For Heat Transfer Applications, Jessica Townsend, Rebecca J. Christianson, D Venerus, J Buongiorno, M A. Kedzierski, Et Al.

Jessica Townsend

This article reports viscosity data on a series of colloidal dispersions collected as part of the International Nanofluid Property Benchmark Exercise (INPBE). Data are reported for seven different fluids that include dispersions of metal-oxide nanoparticles in water, and in synthetic oil. These fluids, which are also referred to as nanofluids, are currently being researched for their potential to function as heat transfer fluids. In a recently published paper from the INPBE study, thermal conductivity data from more than 30 laboratories around the world were reported and analyzed. Here, we examine the influence of particle shape and concentration on the viscosity …

Nonlinear Ultrashort Pulse Propagation And Multi-Chromatic Ionization In Bulk Dielectrics, Jeremy Gulley

Jeremy R. Gulley

No abstract is currently available.

Performance Enhancement In Organic Solar Cells Using A Grating Electrode, Hoi Lam Tam, Qingyi Yang, Gui Xin Li, F.R. Zhu

Professor ZHU, Fu Rong

Light trapping is a promising approach, e.g., by scattering the incident light to oblique angle to increase the dwell time of the light inside the devices, to improve light absorption in the active layer in organic solar cells (OSCs). In this work, the absorption enhancement in OSCs is realized using a poly(methyl methacrylate) (PMMA)/indium-tin-oxide (ITO) grating electrode. Photovoltaic properties such as external quantum efficiency and power conversion efficiency of a set of structural identical OSCs made with a planar ITO anode (control device) and a PMMA/ITO grating electrode were analyzed. The grating incorporated OSCs resulted in a ~10% increase in …

A Workable Moral Strategy For Achieving And Preserving World Peace: A Strategy That Can Create Over 500,000 American Jobs, Raymond Wilson

Raymond Wilson

Microwave Optics Research, Allen Andersen, Todd Lines

Allen Andersen

The BYU-Idaho Physics Department x-band microwave optics equipment was originally intended for use in classroom demonstrations. I evaluated this equipment for use in research. I designed and built additional equipment needed in order to perform attenuation and other experiments then used it to conduct research on the transmission properties of paper and other substances. The new equipment allowed me to create a standard experimental procedure, take reasonably accurate measurements, and reduce undesired standing wave effects. Mathematical and experimental analysis was done to determine the necessary parameters of the new equipment. The new apparatus is comparable to setups featured in published …