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A Study Of Synchronization Of Nonlinear Oscillators: Application To Epileptic Seizures, Daisuke Takeshita 2010 Missouri University of Science and Technology

A Study Of Synchronization Of Nonlinear Oscillators: Application To Epileptic Seizures, Daisuke Takeshita

Doctoral Dissertations

"This dissertation focuses on several problems in neuroscience from the perspective of nonlinear dynamics and stochastic processes. The first part concerns a method to visualize the idea of the power spectrum of spike trains, which has an educational value to introductory students in biophysics. The next part consists of experimental and computational work on drug-induced epileptic seizures in the rat neocortex. In the experimental part, spatiotemporal patterns of electrical activities in the rat neocortex are measured using voltage-sensitive dye imaging. Epileptic regions show well-synchronized, in-phase activity during epileptic seizures. In the computational part, a network of a Hodgkin-Huxley type neocortical ...


Theoretical Study Of Electron Impact-Ionization Of Molecules, Ola Al-Hagan 2010 Missouri University of Science and Technology

Theoretical Study Of Electron Impact-Ionization Of Molecules, Ola Al-Hagan

Doctoral Dissertations

"There has been impressive progress in the area of theoretical treatments of electron impact ionization (e,2e) of atoms and molecules in the last decade. Most recently, low to intermediate incident electron energies have been reported for molecular systems. In this dissertation, different theoretical models will be used to calculate the fully differential cross section (FDCS) for (e,2e) processes for low to intermediate incident electron energies for a variety of final state electron angles and energies for the diatomic molecules H₂ and N₂, the triatomic molecule H₂O, and the biomolecule HCOOH.

In addition, there has been a large amount ...


Three-Body Dynamics In Single Ionization Of Atomic Hydrogen By 75 Kev Proton Impact, Aaron C. LaForge 2010 Missouri University of Science and Technology

Three-Body Dynamics In Single Ionization Of Atomic Hydrogen By 75 Kev Proton Impact, Aaron C. Laforge

Doctoral Dissertations

"Doubly differential cross sections (DDCS) for single ionization of atomic hydrogen by 75 keV proton impact have been measured as a function of the projectile scattering angle and energy loss. This pure three-body collision system represents a fundamental test case for the study of the reaction dynamics in few-body systems. A comparison between theory and experiment reveals that three-body dynamics is important at all scattering angles, and that an accurate description of the role of the projectile-target nucleus interaction as well as the second order projectile-electron interaction remains a major challenge to theory. However, progress is being made in understanding ...


A Study Of The Growth And Structure Of Chromium And Iron Oxide Films On Pd(001) Using X-Ray Photoelectron Diffraction And Low Energy Electron Diffraction, Tina Dhekial-Phukan 2010 Missouri University of Science and Technology

A Study Of The Growth And Structure Of Chromium And Iron Oxide Films On Pd(001) Using X-Ray Photoelectron Diffraction And Low Energy Electron Diffraction, Tina Dhekial-Phukan

Doctoral Dissertations

"In this study, attempts were made to grow well-ordered chromium- and iron-oxide films on a Pd(001) surface, and two sample preparation techniques, the multilayer and the sequential growth techniques, were used to grow these transition metal oxide films. The study is a part of a larger project that aims to look into the interaction between metal substrates and the overlayers grown on them. Previous studies of oxide films on Ag(001) resulted in the growth of 4-fold and 3-fold symmetry oxide structures from the multilayer and sequential growth techniques respectively. The present investigation's goal was to study how ...


Unidirectional Nonlinear Pt -Symmetric Optical Structures, H. Ramezani, Tsampikos Kottos 2010 The University of Texas Rio Grande Valley

Unidirectional Nonlinear Pt -Symmetric Optical Structures, H. Ramezani, Tsampikos Kottos

Physics and Astronomy Faculty Publications and Presentations

We show that nonlinear optical structures involving a balanced gain-loss profile can act as unidirectional optical valves. This is made possible by exploiting the interplay between the fundamental symmetries of parity (P) and time (T), with optical nonlinear effects. This unidirectional dynamics is specifically demonstrated for the case of an integrable PT-symmetric nonlinear system.


Transport Studies Of Nh4no3 Doped Methyl Cellulose Electrolyte, Siti Rohana Majid, Shuhaimi N. E. A., Teo L. P., Arof A. K. 2009 University of Malaya

Transport Studies Of Nh4no3 Doped Methyl Cellulose Electrolyte, Siti Rohana Majid, Shuhaimi N. E. A., Teo L. P., Arof A. K.

Siti Rohana Majid

This work reports on the transport properties of NH4NO3 doped methyl cellulose (MC) polymer electrolyte. The polymer electrolyte films were prepared by the technique of solvent casting. The highest room temperature conductivity of MC doped with 25 wt.% NH4NO3 is 2.10 +/- 0.37 x 10(-6) S cm(-1). Conductivity-temperature relationship obeys the Vogel-Tamman-Fulcher (VTF) rule from which the glass transition temperature, T-g was evaluated. The mobility, p and number density of charge carrier, n were calculated using the Rice and Roth model. (C) 2010 Elsevier B.V. All rights reserved.


Characteristics Of Methyl Cellulose-Nh4no3-Peg Electrolyte And Application In Fuel Cells, Siti Rohana Majid, Shuhaimi N. E. A., Alias N. A., Kufian M. Z., Arof A. K. 2009 University of Malaya

Characteristics Of Methyl Cellulose-Nh4no3-Peg Electrolyte And Application In Fuel Cells, Siti Rohana Majid, Shuhaimi N. E. A., Alias N. A., Kufian M. Z., Arof A. K.

Siti Rohana Majid

We report the viability of methyl cellulose (MC) as a membrane in a polymer electrolyte membrane fuel cell (PEMFC). Methyl cellulose serves as the polymer host, ammonium nitrate (NH4NO3) as the doping salt and poly(ethylene glycol) (PEG) as plasticizer. Conductivity measurement was carried out using electrochemical impedance spectroscopy. The room temperature conductivity of pure MC film is is (3.08 +/- 0.63) x 10(-11)S cm(-1). The conductivity increased to (2.10 +/- 0.37) x 10(-6)S cm(-1) on addition of 25 wt.% NH4NO3. By adding 15 wt.% of PEG 200 to the highest conducting ...


Towards High Efficiency Solution Processable Inverted Bulk Heterojunction Polymer Solar Cells Using Modified Indium-Tin-Oxide Cathode, XH Chen, JX Yang, LY Xuan, C Laley, J Lu, F.R. Zhu, KP Loh 2009 Hong Kong Baptist University

Towards High Efficiency Solution Processable Inverted Bulk Heterojunction Polymer Solar Cells Using Modified Indium-Tin-Oxide Cathode, Xh Chen, Jx Yang, Ly Xuan, C Laley, J Lu, F.R. Zhu, Kp Loh

Professor ZHU, Fu Rong

No abstract provided.


Results From A Beam Test Of A Prototype Plt Diamond Pixel Telescope, R. Hall-Wilton, R. Loos, V. Ryjov, M. Pernicka, S. Schmied, H. Steninger, V. Halyo, B. Harrop, A. Hunt, D. Marlow, B. Sands, D. Strickland, O. Atramentov, E. Bartz, J. Doroshenko, Y. Gershtein, D. Hits, S. Schnetzer, R. Stone, P. Bulter, S. Lansley, N. Rodrigues, W. Bugg, M Hollingsworth, Stefan Spanier, W. Johns 2009 University of Tennessee - Knoxville

Results From A Beam Test Of A Prototype Plt Diamond Pixel Telescope, R. Hall-Wilton, R. Loos, V. Ryjov, M. Pernicka, S. Schmied, H. Steninger, V. Halyo, B. Harrop, A. Hunt, D. Marlow, B. Sands, D. Strickland, O. Atramentov, E. Bartz, J. Doroshenko, Y. Gershtein, D. Hits, S. Schnetzer, R. Stone, P. Bulter, S. Lansley, N. Rodrigues, W. Bugg, M Hollingsworth, Stefan Spanier, W. Johns

stefan spanier

We describe results from a beam test of a telescope consisting of three planes of single-crystal, diamond pixel detectors. This telescope is a prototype for a small-angle luminosity monitor, the Pixel Luminosity Telescope (PLT), for CMS. We recorded the pixel addresses and pulse heights of all pixels over threshold as well as the fast-or signals from all three telescope planes. We present results on the telescope performance including occupancies, pulse heights, fast-or efficiencies and particle tracking. These results show that the PLT design meets all required specifications.


Evolution Of Solitary Waves For A Perturbed Nonlinear Schrodinger Equation, Tim Marchant 2009 University of Wollongong

Evolution Of Solitary Waves For A Perturbed Nonlinear Schrodinger Equation, Tim Marchant

Tim Marchant

Soliton perturbation theory is used to determine the evolution of a solitary wave described by a perturbed nonlinear Schrödinger equation. Perturbation terms, which model wide classes of physically relevant perturbations, are considered. An analytical solution is found for the first-order correction of the evolving solitary wave. This solution for the solitary wave tail is in integral form and an explicit expression is found, for large time. Singularity theory, usually used for combustion problems, is applied to the large time expression for the solitary wave tail. Analytical results are obtained, such as the parameter regions in which qualitatively different types of ...


Relations Relevant To The One Body Reduction Of The Gravitational Two Body Problem, Eric Addison 2009 Utah State University

Relations Relevant To The One Body Reduction Of The Gravitational Two Body Problem, Eric Addison

Eric Addison

The one body reduction of the two body problem is outlined along with several important relations. It is verified that both masses in a binary system orbit around the common center of mass.


Solitons In Two-Dimensional Anti-De Sitter Space, Tonnis ter Veldhuis 2009 Macalester College

Solitons In Two-Dimensional Anti-De Sitter Space, Tonnis Ter Veldhuis

Tonnis ter Veldhuis

No abstract provided.


Characteristics Of Methyl Cellulose-Nh4no3-Peg Electrolyte And Application In Fuel Cells, Siti Rohana Majid, Shuhaimi N. E. A., Alias N. A., Kufian M. Z., Arof A. K. 2009 University of Malaya

Characteristics Of Methyl Cellulose-Nh4no3-Peg Electrolyte And Application In Fuel Cells, Siti Rohana Majid, Shuhaimi N. E. A., Alias N. A., Kufian M. Z., Arof A. K.

Siti Rohana Majid

We report the viability of methyl cellulose (MC) as a membrane in a polymer electrolyte membrane fuel cell (PEMFC). Methyl cellulose serves as the polymer host, ammonium nitrate (NH4NO3) as the doping salt and poly(ethylene glycol) (PEG) as plasticizer. Conductivity measurement was carried out using electrochemical impedance spectroscopy. The room temperature conductivity of pure MC film is is (3.08 +/- 0.63) x 10(-11)S cm(-1). The conductivity increased to (2.10 +/- 0.37) x 10(-6)S cm(-1) on addition of 25 wt.% NH4NO3. By adding 15 wt.% of PEG 200 to the highest conducting ...


The Stellar And Gaseous Contents Of The Orion Dwarf Galaxy, John Cannon, Korey Haynes, Hans Most, John Salzer, Kaitlin Haugland, Jillian Scudder, Arthur Sugden, Jacob Weindling 2009 Macalester College

The Stellar And Gaseous Contents Of The Orion Dwarf Galaxy, John Cannon, Korey Haynes, Hans Most, John Salzer, Kaitlin Haugland, Jillian Scudder, Arthur Sugden, Jacob Weindling

John Cannon

No abstract provided.


Understanding Space Weather Customers In Gps-Reliant Industries, Jennifer Meehan, G. Fisher, W. Murtagh 2009 Utah State University

Understanding Space Weather Customers In Gps-Reliant Industries, Jennifer Meehan, G. Fisher, W. Murtagh

Jennifer (Jinni) Meehan

No abstract provided.


Physics And Chemistry Of Hot-Wire Chemical Vapor Deposition From Silane: Measuring And Modeling The Silicon Epitaxy Deposition Rate, Ina Martin, Charles Teplin, James Doyle, Howard Branz, Paul Stradins 2009 Macalester College

Physics And Chemistry Of Hot-Wire Chemical Vapor Deposition From Silane: Measuring And Modeling The Silicon Epitaxy Deposition Rate, Ina Martin, Charles Teplin, James Doyle, Howard Branz, Paul Stradins

James R. Doyle

No abstract provided.


Spatially Resolved Polycyclic Aromatic Hydrocarbon Emission Features In Nearby, Low Metallicity, Star-Forming Galaxies, Korey Haynes, John Cannon, Evan Skillman, Dale Jackson, Robert Gehrz 2009 Macalester College

Spatially Resolved Polycyclic Aromatic Hydrocarbon Emission Features In Nearby, Low Metallicity, Star-Forming Galaxies, Korey Haynes, John Cannon, Evan Skillman, Dale Jackson, Robert Gehrz

John Cannon

No abstract provided.


Instantaneous Velocities Of A Two Body Orbit, Eric Addison 2009 Utah State University

Instantaneous Velocities Of A Two Body Orbit, Eric Addison

Eric Addison

This short note will derive expressions for the instantaneous velocity of the components in a two-body elliptical Keplerian orbit.


Observation Of Long-Range Near-Side Angular Correlations In Proton-Proton Collisions At The Lhc, stefan spanier 2009 University of Tennessee - Knoxville

Observation Of Long-Range Near-Side Angular Correlations In Proton-Proton Collisions At The Lhc, Stefan Spanier

stefan spanier

Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range of pseudorapidity (eta) and azimuthal angle (phi). Short-range correlations in Delta(eta), which are studied in minimum bias events, are characterized using a simple "independent cluster" parametrization in order to quantify their strength (cluster size) and their extent in eta (cluster decay width). Long-range azimuthal correlations are studied differentially as a function of charged particle multiplicity and particle transverse momentum using a 980 inverse ...


Derivation Of Initial Velocities For A Two-Body Orbit In The Barycenter Frame, Eric Addison 2009 Utah State University

Derivation Of Initial Velocities For A Two-Body Orbit In The Barycenter Frame, Eric Addison

Eric Addison

The readily available information for two body orbits generally refers to the one dimensional, reduced mass case. Information about initial conditions in the barycenter frame is not easily found. In order to derive the initial velocities required for a two-body orbit in the barycenter frame, the momentum of the reduced mass can be used.


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