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2018

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Articles 1651 - 1680 of 1891

Full-Text Articles in Physics

Cargo Transport By Myosin Va Molecular Motors Within Three-Dimensional In Vitro Models Of The Intracellular Actin Cytoskeletal Network, Andrew Thomas Lombardo Jan 2018

Cargo Transport By Myosin Va Molecular Motors Within Three-Dimensional In Vitro Models Of The Intracellular Actin Cytoskeletal Network, Andrew Thomas Lombardo

Graduate College Dissertations and Theses

Intracellular cargo transport involves the movement of critical cellular components (e.g. vesicles, organelles, mRNA, chromosomes) along cytoskeletal tracks by tiny molecular motors. Myosin Va motors have been demonstrated to play a vital role in the transport of cargos destined for the cell membrane by navigating their cargos through the three-dimensional actin networks of the cell. Transport of cargo through these networks presents many challenges, including directional and physical obstacles which teams of myosin Va-bound to a single cargo must overcome. Specifically, myosin Va motors are presented with numerous actin-actin intersections and dense networks of filaments which can act as a …


Some Results On A Class Of Functional Optimization Problems, David Rushing Dewhurst Jan 2018

Some Results On A Class Of Functional Optimization Problems, David Rushing Dewhurst

Graduate College Dissertations and Theses

We first describe a general class of optimization problems that describe many natu- ral, economic, and statistical phenomena. After noting the existence of a conserved quantity in a transformed coordinate system, we outline several instances of these problems in statistical physics, facility allocation, and machine learning. A dynamic description and statement of a partial inverse problem follow. When attempting to optimize the state of a system governed by the generalized equipartitioning princi- ple, it is vital to understand the nature of the governing probability distribution. We show that optimiziation for the incorrect probability distribution can have catas- trophic results, e.g., …


Compositional And Topographical Characterization Of Carbonaceous Chondritic Meteorites Moss And Murray Using Micro-Raman Spectroscopy And Sem/Eds, Aaron Stokke Jan 2018

Compositional And Topographical Characterization Of Carbonaceous Chondritic Meteorites Moss And Murray Using Micro-Raman Spectroscopy And Sem/Eds, Aaron Stokke

All Graduate Theses, Dissertations, and Other Capstone Projects

Carbonaceous chondritic meteorites are considered some of the most primitive surviving materials from the formation of our solar system. Thus, these objects can provide information about planet formation through their physical properties (such as structure, composition, and morphology) which can be characterized using microscopy and spectroscopy techniques. In this work, the analytical methods of Raman spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and optical microscopy are applied to determine the mineralogical, topographical, and elemental compositions of two carbonaceous chondritic fragments: Moss and Murray. Both samples were comprised of chondrules and matrix while Moss contained chondrule rims and Murray …


Comparative Study Of Cv3 Carbonaceous Chondrites Allende And Bali Using Micro-Raman Spectroscopy And Sem/Eds, Raka Paul Jan 2018

Comparative Study Of Cv3 Carbonaceous Chondrites Allende And Bali Using Micro-Raman Spectroscopy And Sem/Eds, Raka Paul

All Graduate Theses, Dissertations, and Other Capstone Projects

The birth of the solar system (over 4 billion years) is speculated to have happened from a nebula, swirling and compacting in localized regions to eventually form the Sun and planets. This complex process consists of numerous changes and intermediary steps, yet to be fully understood. Carbonaceous chondritic meteorites are relics of that process and therefore have potential to reveal information about the formation history. Several theories have been formulated linking their composition to planet formation. This study focusses on two carbonaceous chondritic specimens, Allende and Bali, both of the group CV and petrologic type 3. CV meteorites are abundant …


Identification Of Streptococcus Pyogenes Using Raman Spectroscopy, Ehsan Majidi Jan 2018

Identification Of Streptococcus Pyogenes Using Raman Spectroscopy, Ehsan Majidi

Wayne State University Dissertations

Despite the attention that Raman Spectroscopy has gained recently in the area of pathogen identification, the spectra analyses techniques are not well developed. In most scenarios, they rely on expert intervention to detect and assign the peaks of the spectra to specific molecular vibration. Although some investigators have used machine-learning techniques to classify pathogens, these studies are usually limited to a specific application, and the generalization of these techniques is not clear. Also, a wide range of algorithms have been developed for classification problems, however, there is less insight to applying such methods on Raman spectra. Furthermore, analyzing the Raman …


Band Filling And Temperature Effects On Electrical Conductivity In Strongly Correlated Hybridized Electron Systems, Dylan T. Meyer Jan 2018

Band Filling And Temperature Effects On Electrical Conductivity In Strongly Correlated Hybridized Electron Systems, Dylan T. Meyer

All Graduate Theses, Dissertations, and Other Capstone Projects

We investigate the effects of band filling as well as temperature change on the electrical conductivity of materials with strong interelectron interaction as well as band hybridization. This is done by use of the irreducible two-particle Green function method applied to strongly correlated electron systems described by the Periodic Anderson Model. It was found that there is a definite peak in electrical conductivity at low band occupancy when the d-energy sub-band is half filled. Conductivity was found to have a sharp drop with an increase in temperature as a result of thermal dispersion as well as a change in the …


Mid-Latitude Climatologies Of Mesospheric Temperature And Geophysical Temperature Variability Determined With The Rayleigh-Scatter Lidar At Alo-Usu, Joshua P. Herron, Vincent B. Wickwar Jan 2018

Mid-Latitude Climatologies Of Mesospheric Temperature And Geophysical Temperature Variability Determined With The Rayleigh-Scatter Lidar At Alo-Usu, Joshua P. Herron, Vincent B. Wickwar

All Physics Faculty Publications

From 1993-2004, 839 nights were observed with the Rayleigh-scatter lidar at Utah State University’s Atmospheric Lidar Observatory. They were reduced to obtain nighttime mesospheric temperatures between 45 and ~90 km, which were then combined to derive composite annual climatologies of mid-latitude temperatures and geophysical temperature variability. At 45 km, near the stratopause, there is a ~250 K temperature minimum in mid-winter and a 273 K maximum in mid-May. The variability behaves oppositely, being 7-10 K in winter and 2.5 K in summer. At 85 km, there is a 215 K temperature maximum at the end of December and a 170 …


Incorporating Electron Range Approximations Into Secondary Electron Emission Models, Gregory Wilson Jan 2018

Incorporating Electron Range Approximations Into Secondary Electron Emission Models, Gregory Wilson

Conference Proceedings

No abstract provided.


Secondary Electron Yield Measurements Of Carbon Nanotube Forests: Dependence On Morphology And Substrate, Brian Wood, Justin Christensen, Gregory Wilson, T. -C. Shen, Jr Dennison Jan 2018

Secondary Electron Yield Measurements Of Carbon Nanotube Forests: Dependence On Morphology And Substrate, Brian Wood, Justin Christensen, Gregory Wilson, T. -C. Shen, Jr Dennison

Conference Proceedings

No abstract provided.


Effects Of Sample Adhesives Acoustic Properties On Spatial Resolution Of Pulsed Electroacoustic Measurements, Zachary Gibson, Jr Dennison, Lee Pearson, Erick Griffiths, Anthony Pearson, Virginie Griseri Jan 2018

Effects Of Sample Adhesives Acoustic Properties On Spatial Resolution Of Pulsed Electroacoustic Measurements, Zachary Gibson, Jr Dennison, Lee Pearson, Erick Griffiths, Anthony Pearson, Virginie Griseri

Conference Proceedings

No abstract provided.


Time-Evolved Constant Voltage Conductivity Polymeric Materials, Brian Wood, Jr Dennison, David King Jan 2018

Time-Evolved Constant Voltage Conductivity Polymeric Materials, Brian Wood, Jr Dennison, David King

Conference Proceedings

No abstract provided.


Electron Range Computational Tool For Arbitrary Materials Over A Wide Energy Range, Gregory Wilson, Jr Dennison, Anne C. Starley Jan 2018

Electron Range Computational Tool For Arbitrary Materials Over A Wide Energy Range, Gregory Wilson, Jr Dennison, Anne C. Starley

Conference Proceedings

No abstract provided.


A Predictive Range Expression: Applications And Limitations, Gregory Wilson, Anne C. Starley, Lisa Phillipps, Jr Dennison Jan 2018

A Predictive Range Expression: Applications And Limitations, Gregory Wilson, Anne C. Starley, Lisa Phillipps, Jr Dennison

Journal Articles

No abstract provided.


Time-Evolved Constant Voltage Conductivity Measurements Of Common Spaceborne Polymeric Materials, Brian Wood, David King, Jr Dennison Jan 2018

Time-Evolved Constant Voltage Conductivity Measurements Of Common Spaceborne Polymeric Materials, Brian Wood, David King, Jr Dennison

Journal Articles

No abstract provided.


Secondary Electron Yield Measurements Of Carbon Nanotube Forests: Dependence On Morphology And Substrate, Brian Wood, Justin Christensen, Gregory Wilson, T C. Shen, Jr Dennison Jan 2018

Secondary Electron Yield Measurements Of Carbon Nanotube Forests: Dependence On Morphology And Substrate, Brian Wood, Justin Christensen, Gregory Wilson, T C. Shen, Jr Dennison

Posters

No abstract provided.


Electron Range Computational Tool For Arbitrary Materials Over A Wide Energy Range, Gregory Wilson, Anne C. Starley, Jr Dennison Jan 2018

Electron Range Computational Tool For Arbitrary Materials Over A Wide Energy Range, Gregory Wilson, Anne C. Starley, Jr Dennison

Posters

No abstract provided.


Wireless Antenna Detection Of Electrostatic Discharge Events, Allen Andersen, Jr Dennison Jan 2018

Wireless Antenna Detection Of Electrostatic Discharge Events, Allen Andersen, Jr Dennison

Posters

No abstract provided.


Wireless Antenna Detection Of Electrostatic Discharge Events, Allen Andersen, Jr Dennison Jan 2018

Wireless Antenna Detection Of Electrostatic Discharge Events, Allen Andersen, Jr Dennison

Posters

Wireless intra-spacecraft communication systems are being developed due to their potential for weight-saving and design flexibility compared to wired systems. Such systems are essentially an on-board Wi-Fi network allowing various spacecraft systems to communicate wirelessly.


Effects Of Sample Adhesives Acoustic Properties On Spatial Resolution Of Pulsed Electroacoustic Measurements, Zachary Gibson, Jr Dennison, Lee Pearson, Erick Griffiths, Anthony Pearson, Virginie Griseri Jan 2018

Effects Of Sample Adhesives Acoustic Properties On Spatial Resolution Of Pulsed Electroacoustic Measurements, Zachary Gibson, Jr Dennison, Lee Pearson, Erick Griffiths, Anthony Pearson, Virginie Griseri

Posters

No abstract provided.


Parameterization Of Secondary And Backscattered Electron Yields For Spacecraft Charging, Justin Christensen, Phil Lundgreen, Jr Dennison Jan 2018

Parameterization Of Secondary And Backscattered Electron Yields For Spacecraft Charging, Justin Christensen, Phil Lundgreen, Jr Dennison

Posters

No abstract provided.


Parameterization Of Secondary And Backscattered Electron Yields For Spacecraft Charging, Jr Dennison, Phil Lundgreen, Justin Christensen Jan 2018

Parameterization Of Secondary And Backscattered Electron Yields For Spacecraft Charging, Jr Dennison, Phil Lundgreen, Justin Christensen

Posters

No abstract provided.


Wireless Antenna Detection Of Electrostatic Discharge Events, Allen Andersen, Jr Dennison Jan 2018

Wireless Antenna Detection Of Electrostatic Discharge Events, Allen Andersen, Jr Dennison

Posters

Wireless intra-spacecraft communication systems are being developed due to their potential for weight-saving and design flexibility compared to wired systems [1,2]. Such systems are essentially an on-board Wi-Fi network allowing various spacecraft systems to communicate wirelessly.


Using Quantile-Quantile Plots To Compare Experimental Apples And Oranges In Physics Labs, Allen Andersen, Jr Dennison Jan 2018

Using Quantile-Quantile Plots To Compare Experimental Apples And Oranges In Physics Labs, Allen Andersen, Jr Dennison

Posters

No abstract provided.


Electron Yield Properties Of Low-Density Polyethylene, Jordan Lee, Jr Dennison Jan 2018

Electron Yield Properties Of Low-Density Polyethylene, Jordan Lee, Jr Dennison

Presentations

No abstract provided.


Incorporating Electron Range Approximations Into Secondary Electron Emission Models, Gregory Wilson Jan 2018

Incorporating Electron Range Approximations Into Secondary Electron Emission Models, Gregory Wilson

Presentations

No abstract provided.


Characterizing The Effects Of Radiation On Muscle Cells, Lori Caldwell, Charles Harding, Eryn Hanson, Jr Dennison, Elizabeth Vargis Jan 2018

Characterizing The Effects Of Radiation On Muscle Cells, Lori Caldwell, Charles Harding, Eryn Hanson, Jr Dennison, Elizabeth Vargis

Presentations

No abstract provided.


Characterizing The Effects Of Radiation On Muscle Cells, Lori Caldwell, Charles Harding, Eryn Hanson, Jr Dennison, Elizabeth Vargis Jan 2018

Characterizing The Effects Of Radiation On Muscle Cells, Lori Caldwell, Charles Harding, Eryn Hanson, Jr Dennison, Elizabeth Vargis

Presentations

No abstract provided.


Simulating Muscle Atrophy Due To Microgravity And Ionizing Radiation, Lori Caldwell, Eryn Hanson, Alexandra H. Nelson, Charles Harding, Jr Dennison, Elizabeth Vargis Jan 2018

Simulating Muscle Atrophy Due To Microgravity And Ionizing Radiation, Lori Caldwell, Eryn Hanson, Alexandra H. Nelson, Charles Harding, Jr Dennison, Elizabeth Vargis

Presentations

No abstract provided.


Electron Yield Of Low-Density Polyethylene, Jordan Lee, Jr Dennison Jan 2018

Electron Yield Of Low-Density Polyethylene, Jordan Lee, Jr Dennison

Presentations

No abstract provided.


Chemical Vapor Transport Synthesis Of A Selenium-Based Two-Dimensional Material, Tali̇p Serkan Kasirga Jan 2018

Chemical Vapor Transport Synthesis Of A Selenium-Based Two-Dimensional Material, Tali̇p Serkan Kasirga

Turkish Journal of Physics

Selenium-based layered materials, and in particular transition-metal diselenides (TMDSs), have intriguing properties in the monolayer limit. Materials such as MoSe$_{2}$, WSe$_{2}$, and NbSe$_{2}$ display striking features such as spin-valley coupling at the valence-band edges and offer great potential for optoelectronics applications. Although a dozen of other TMDSs have been realized or proposed, whether two-dimensional chalcogens are possible or not is still an open challenge. In this work, we show the chemical vapor transport synthesis of a novel, atomically thin selenium-based material on oxidized silicon substrates. This new member of the two-dimensional materials family has a unique Raman spectrum similar to …