Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Institution
-
- University of Nebraska - Lincoln (3584)
- Selected Works (2697)
- Missouri University of Science and Technology (2142)
- Utah State University (1868)
- Old Dominion University (1590)
-
- TÜBİTAK (1338)
- Syracuse University (889)
- California Polytechnic State University, San Luis Obispo (879)
- University of Kentucky (847)
- Air Force Institute of Technology (813)
- University of Central Florida (608)
- Portland State University (567)
- William & Mary (552)
- University of Tennessee, Knoxville (543)
- City University of New York (CUNY) (536)
- University of Nevada, Las Vegas (536)
- Technological University Dublin (527)
- University of Texas Rio Grande Valley (506)
- Wright State University (472)
- University of South Carolina (448)
- Brigham Young University (408)
- Michigan Technological University (401)
- University of New Mexico (386)
- Chapman University (351)
- SelectedWorks (327)
- Virginia Commonwealth University (327)
- Cleveland State University (307)
- Florida Institute of Technology (295)
- University of Arkansas, Fayetteville (263)
- University of Dayton (260)
- Keyword
-
- Physics (871)
- Department of Physics (245)
- Optics (184)
- Spectroscopy (177)
- Gravitational waves (162)
-
- Scattering (151)
- Graphene (147)
- Galaxies (133)
- Plasma (133)
- Thin films (133)
- Simulation (130)
- Nanoparticles (124)
- Electron (123)
- Polarization (123)
- Superconductivity (119)
- Radiation (109)
- Pure sciences (105)
- Condensed matter (102)
- Ionization (102)
- Quantum physics (99)
- Photoluminescence (98)
- CMS (96)
- Laser (95)
- Semiconductors (95)
- Cosmology (89)
- Energy (89)
- Ionosphere (88)
- Magnetism (87)
- Thermodynamics (87)
- Temperature (86)
- Publication Year
- Publication
-
- Physics Faculty Publications (1883)
- Physics Faculty Research & Creative Works (1742)
- Turkish Journal of Physics (1338)
- Faculty Publications (1155)
- Theses and Dissertations (1078)
-
- Physics (898)
- Physics and Astronomy Faculty Publications (772)
- Electronic Theses and Dissertations (680)
- All Physics Faculty Publications (652)
- Physics - All Scholarship (553)
- Physics Faculty Publications and Presentations (498)
- Doctoral Dissertations (495)
- Physics and Astronomy Faculty Publications and Presentations (451)
- Articles (393)
- Physics Publications (378)
- Department of Physics and Astronomy: Faculty Publications (371)
- Kenneth Bloom Publications (368)
- Masters Theses (365)
- Dissertations, Theses, and Masters Projects (361)
- Publications and Research (313)
- Mathematics, Physics, and Computer Science Faculty Articles and Research (311)
- Peter Dowben Publications (284)
- David Sellmyer Publications (278)
- Aerospace, Physics, and Space Science Faculty Publications (275)
- International Building Physics Conference 2018 (255)
- Physics & Astronomy ETDs (246)
- Dissertations (245)
- Anthony F. Starace Publications (229)
- Electrical and Computer Engineering Faculty Publications (192)
- Robert Katz Publications (191)
- Publication Type
Articles 31951 - 31980 of 36559
Full-Text Articles in Physical Sciences and Mathematics
Organization Of Sequences Of Bifurcations Of Periodic Orbits, D. A. Sadovskii, J. A. Shaw, John B. Delos
Organization Of Sequences Of Bifurcations Of Periodic Orbits, D. A. Sadovskii, J. A. Shaw, John B. Delos
Arts & Sciences Articles
Numerical calculations have shown that bifurcations of periodic orbits of Hamiltonian systems often occur in organized groups. Normal-form theory provides an explanation.
Trajectory Mapping And Applications To Data From The Upper Atmosphere Research Satellite, Gary A. Morris, Mark R. Schoeberl, Lynn C. Sparling, Paul A. Newman, Leslie R. Lait, Lee Elson, Joe Waters, Robert A. Suttie, Aidan Roche, Jack Kumer, James M. Russell Iii
Trajectory Mapping And Applications To Data From The Upper Atmosphere Research Satellite, Gary A. Morris, Mark R. Schoeberl, Lynn C. Sparling, Paul A. Newman, Leslie R. Lait, Lee Elson, Joe Waters, Robert A. Suttie, Aidan Roche, Jack Kumer, James M. Russell Iii
Gary A. Morris
The problem of creating synoptic maps from asynoptically gathered trace gas data has prompted the development of a number of schemes. Most notable among these schemes are the Kalman filter, the Salby-Fourier technique, and constituent reconstruction. This paper explores a new technique called "trajectory mapping." Trajectory mapping creates synoptic maps from asynoptically gathered data by advecting measurements backward or forward in time using analyzed wind fields. A significant portion of this work is devoted to an analysis of errors in synoptic trajectory maps associated with the calculation of individual parcel trajectories. In particular, we have considered (1) calculational errors; (2) …
Trajectory Mapping And Applications To Data From The Upper Atmosphere Research Satellite, Gary A. Morris, Mark R. Schoeberl, Lynn C. Sparling, Paul A. Newman, Leslie R. Lait, Lee Elson, Joe Waters, Robert A. Suttie, Aidan Roche, Jack Kumer, James M. Russell Iii
Trajectory Mapping And Applications To Data From The Upper Atmosphere Research Satellite, Gary A. Morris, Mark R. Schoeberl, Lynn C. Sparling, Paul A. Newman, Leslie R. Lait, Lee Elson, Joe Waters, Robert A. Suttie, Aidan Roche, Jack Kumer, James M. Russell Iii
Physics and Astronomy Faculty Publications
The problem of creating synoptic maps from asynoptically gathered trace gas data has prompted the development of a number of schemes. Most notable among these schemes are the Kalman filter, the Salby-Fourier technique, and constituent reconstruction. This paper explores a new technique called "trajectory mapping." Trajectory mapping creates synoptic maps from asynoptically gathered data by advecting measurements backward or forward in time using analyzed wind fields. A significant portion of this work is devoted to an analysis of errors in synoptic trajectory maps associated with the calculation of individual parcel trajectories. In particular, we have considered (1) calculational errors; (2) …
Mercury Surface-Plasmon Dispersion: Experiment And Theory, Bong-Ok Kim, Geunseop Lee, E. Ward Plummer, Peter A. Dowben, A. Liebsch
Mercury Surface-Plasmon Dispersion: Experiment And Theory, Bong-Ok Kim, Geunseop Lee, E. Ward Plummer, Peter A. Dowben, A. Liebsch
Peter Dowben Publications
Momentum-resolved inelastic electron spectroscopy has been utilized to measure the surface-plasmon dispersion and damping for thick Hg films grown onto a Cu(100) substrate. Hg has been investigated since it offers an opportunity to examine the effects of the crystal potential on the surface-plasmon dispersion, and to correlate the measurements on a surface with those for collective excitations in clusters. The effects of the electronic band structure of Hg can be seen in the energy and width of the surface plasmon as a function of momentum transfer q∥. Dynamical response calculations were performed for a semi-infinite electron gas where several important …
Polarized Light Emission In Kev He²⁺ + Na(3s) Collisions, S. Schippers, P. Boduch, J. Van Buchem, F. W. Bliek, R. Hoekstra, R. Morgenstem, Ronald E. Olson
Polarized Light Emission In Kev He²⁺ + Na(3s) Collisions, S. Schippers, P. Boduch, J. Van Buchem, F. W. Bliek, R. Hoekstra, R. Morgenstem, Ronald E. Olson
Physics Faculty Research & Creative Works
We investigated l- and m-distributions of He u (n = 4) states formed during 213.3 keV amu'1 He2+ + Na(3s) collisions by measuring profiles and the linear polarization of the He u (4→ 3) emission. We found that at these energies capture into He+(4f) dominates over capture into other He+(4i) states. Over the indicated energy range the polarization of the4He u (4 → 3) photon emission increases from 0.2 to 0.3 indicating a strong alignment of the captured projectile charge cloud along the intemuclear axis. Due to the non-zero nuclear spin the polarization is up to 10% lower when using3He2+ …
Electron Emission From Foils Induced By Heavy-Ion Collisions, R. A. Sparrow, Ronald E. Olson, D. Schneider
Electron Emission From Foils Induced By Heavy-Ion Collisions, R. A. Sparrow, Ronald E. Olson, D. Schneider
Physics Faculty Research & Creative Works
Absolute double differential yield per ion has been calculated for forward and backward electron emission produced by collisions of highly charged uranium ions with carbon foils of varying thicknesses. A Monte Carlo method has been developed which employs multiple ionization of the carbon and subsequent energy and angular straggling of freed electrons through the foil. A comparison with experimental double differential electron emission yields shows general agreement. Calculated total electron emission is in agreement with experiment at 44 fig cm-2 as well as the results of Rothard et el. In addition, the radial distribution of energy deposited by the electrons …
Polarized Light Emission In Kev He ²⁺+Na(3s) Collisions, S. Schippers, P. Boduch, J. Van Buchem, F. W. Bliek, R. Hoekstra, R. Morgenstern, Ronald E. Olson
Polarized Light Emission In Kev He ²⁺+Na(3s) Collisions, S. Schippers, P. Boduch, J. Van Buchem, F. W. Bliek, R. Hoekstra, R. Morgenstern, Ronald E. Olson
Physics Faculty Research & Creative Works
We investigated l- and m-distributions of He Pi (n=4) states formed during 2-13.3 keV amu -1 He 2++Na(3s) collisions by measuring profiles and the linear polarization of the He Pi (4 to 3) emission. We found that at these energies capture into He +(4f) dominates over capture into other He +(4l) states. Over the indicated energy range the polarization of the 4He Pi (4 to 3) photon emission increases from 0.2 to 0.3 indicating a strong alignment of the captured projectile charge cloud along the internuclear axis. Due to the non-zero nuclear spin the polarization is up to 10% lower …
Phononic Band Structure In A Mass Chain, Samantha Parmley, Tom Zobrist, Terry Clough, Anthony Perez-Miller, Mark Makela, Roger Yu
Phononic Band Structure In A Mass Chain, Samantha Parmley, Tom Zobrist, Terry Clough, Anthony Perez-Miller, Mark Makela, Roger Yu
All Faculty Scholarship for the College of the Sciences
The vibrational properties of a finite one‐dimensional string‐mass chain are studied experimentally and theoretically. In the experiment both normal mode analysis and pulse analysis are used to obtain the eigenfrequencies of the string‐mass chain. The theoretical predictions are made based upon the numerical solution to the wave equation. The phononic band structure for a periodically massed string as well as Anderson localized gap modes for a disordered system are found. The theoretical and experimental results match satisfactorily well.
Combination Effects Of Irradiation And Chemical Doping On High Temperature Superconductors, Russell J. Fedewa
Combination Effects Of Irradiation And Chemical Doping On High Temperature Superconductors, Russell J. Fedewa
Honors Theses
The goal of this project is to investigate some methods that improve the critical transport current in high temperature superconductors. A superconductor is a material which can allow an electrical current to flow through it with no resistance. This makes them ideal for a wide variety of applications. Most of the present use is in science or medicine, and show promise in computer circuitry materials and electromagnetic trains. This experiment explores a means of increasing the critical current, the maximum amount of electric current that can pass, and which at present is too low to permit the use of superconductors …
Magnetic Properties Of Nanostructured Cosm/Feco Films, I.A. Al-Omari, David J. Sellmyer
Magnetic Properties Of Nanostructured Cosm/Feco Films, I.A. Al-Omari, David J. Sellmyer
David Sellmyer Publications
Co80Sm29/Fe65Co35 bilayer and multilayer films with Cr underlayers and overlayers have been fabricated and studied. All the samples prepared have in-plane anisotropy and the hysteresis loops were simple single loops for tFeCo≤300 Å indicating that the two phases are strongly exchange coupled. The magnetization of these samples is found to increase with increasing FeCo layer thickness for a fixed CoSm layer thickness. The coercivity, anisotropy constant, and anisotropy field for films with fixed CoSm layer thickness were found to decrease with increasing FeCo layer thickness. The magnetization squareness values of the …
Origin Of The 〈11/20〉 Atomic Short-Range Order In Au-Rich Au-Fe Alloys, M. F. Ling, J. B. Staunton, Duane D. Johnson, F. J. Pinski
Origin Of The 〈11/20〉 Atomic Short-Range Order In Au-Rich Au-Fe Alloys, M. F. Ling, J. B. Staunton, Duane D. Johnson, F. J. Pinski
Duane D. Johnson
We have calculated the atomic short-range order (ASRO) and paramagnetic susceptibility in high-temperature, chemically disordered Au75Fe25 and Au90Fe10, using a density-functional-based, electronic-structure method. For both alloys, we obtain 〈11/20〉-type ASRO, in excellent agreement with experiments performed on samples that have been fast quenched from high temperature. We also identify the underlying electronic mechanism responsible for this unusual ordering behavior. During annealing at high temperatures, we suggest that aligning local moments via an external magnetic field will produce interesting AuFe alloys with 〈100〉-type ASRO.
Single-Layer-Coated Surfaces With Linearized Reflectance Versus Angle Of Incidence: Application To Passive And Active Silicon Rotation Sensors, R. M.A. Azzam, M. M. K. Howlader, T. Y. Georgiou
Single-Layer-Coated Surfaces With Linearized Reflectance Versus Angle Of Incidence: Application To Passive And Active Silicon Rotation Sensors, R. M.A. Azzam, M. M. K. Howlader, T. Y. Georgiou
Electrical Engineering Faculty Publications
A transparent or absorbing substrate can be coated with a transparent thin film to produce a linear reflectanceversus- angle-of-incidence response over a certain range of angles. Linearization at and near normal incidence is a special case that leads to a maximally flat response for p-polarized, s-polarized, or unpolarized light. For midrange and high-range linearization with moderate and high slopes, respectively, the best results are obtained when the incident light is s polarized. Application to a Si substrate that is coated with a SiO2 film leads to novel passive and active reflection rotation sensors. Experimental results and an error analysis …
Naturalness And Superpartner Masses Or When To Give Up On Weak Scale Supersymmetry, Greg W. Anderson, Diego Castano
Naturalness And Superpartner Masses Or When To Give Up On Weak Scale Supersymmetry, Greg W. Anderson, Diego Castano
Chemistry and Physics Faculty Articles
Superpartner masses cannot be arbitrarily heavy if supersymmetric extensions of the standard model explain the stability of the gauge hierarchy. This ancient and hallowed motivation for weak scale supersymmetry is often quoted, yet no reliable determination of this upper limit on superpartner masses exists. In this paper we compute upper bounds on superpartner masses in the minimal supersymmetric model, and we identify which values of the superpartner masses correspond to the most natural explanation of the hierarchy stability. We compare the most natural value of these masses and their upper limits to the physics reach of current and future colliders. …
Depletion Width And Capacitance Transient Formulas For Deep Traps Of High-Concentration, David C. Look, J. R. Sizelove
Depletion Width And Capacitance Transient Formulas For Deep Traps Of High-Concentration, David C. Look, J. R. Sizelove
Physics Faculty Publications
We derive expressions for the depletion width and capacitance transient applicable to traps which may be deep and of high concentration. The new results are compared with those obtained from the commonly used formulas, and also from an exact analysis. Experimental deep level transient spectroscopic data for EL2 in GaAs are in good agreement.
Transient Wave Mixing And Recording Kinetics In Photorefractive Barium Titanate: A Nonlinear Coupled Mode Approach, Partha P. Banerjee, John M. Jarem
Transient Wave Mixing And Recording Kinetics In Photorefractive Barium Titanate: A Nonlinear Coupled Mode Approach, Partha P. Banerjee, John M. Jarem
Electrical and Computer Engineering Faculty Publications
By using rigorous coupled-wave diffraction theory along with a time-dependent nonlinear formulation, we analyze two- and multiplewave coupling and the grating kinetics in BaTi03 with different boundary interfaces. Efffects of electrostatic and optical anisotropy have been included in the analysis. Significant mode conversion to higher orders is observed only when the boundary interfaces are highly mismatched.
Instability Of The R³Xs¹ Vacuum In Low-Energy Effective String Theory, Mariano Cadoni, Marco Cavaglia
Instability Of The R³Xs¹ Vacuum In Low-Energy Effective String Theory, Mariano Cadoni, Marco Cavaglia
Physics Faculty Research & Creative Works
We present and discuss a Euclidean solution of the low-energy effective string action that can be interpreted as a semiclassical decay process of the ground state of the theory.
Coulomb Gap At Finite Temperatures, Masoud Sarvestani, Michael Schreiber, Thomas Vojta
Coulomb Gap At Finite Temperatures, Masoud Sarvestani, Michael Schreiber, Thomas Vojta
Physics Faculty Research & Creative Works
The Coulomb glass, a model of interacting localized electrons in a random potential, exhibits a soft gap, the Coulomb gap, in the single-particle density of states (DOS) g(ε,T) close to the chemical potential µ. In this paper we investigate the Coulomb gap at finite temperatures T by means of a Monte Carlo method. We find that the Coulomb gap fills with increasing temperature. In contrast to previous results the temperature dependence is, however, much stronger than g(µ,T)~TD-1 as predicted analytically. It can be described by power laws with the exponents 1.75 ± 0.1 for the two-dimensional model and 2.7 …
Comparison Of Time-Domain Reflectometry Performance Factors For Several Dielectric Geometries: Theory And Experiments, S. V. Maheshwarla, R. Venkatasubramanian, Robert F. Boehm
Comparison Of Time-Domain Reflectometry Performance Factors For Several Dielectric Geometries: Theory And Experiments, S. V. Maheshwarla, R. Venkatasubramanian, Robert F. Boehm
Electrical & Computer Engineering Faculty Research
We propose three nontraditional dielectric geometries and present an experimental and theoretical analysis and comparison of time domain reflectometry (TDR) performances for them. The traditional geometry (the probes inserted in material of essentially infinite extent) is compared to three nontraditional geometries where the probes are affixed outside of a core sample, inside of a bore, or flat on the surface of a semi-infinite solid. Our derivation relates the velocity of electromagnetic wave propagation to the complex permittivities and permeabilities of the media and the geometry for the three nontraditional configurations. Experimental results for air, styrofoam, dry sand, wet sand of …
Ionization-Excitation Of Helium By Fast Charged Particles, L. Nagy, J. Wang, Jack C. Straton, James H. Mcguire
Ionization-Excitation Of Helium By Fast Charged Particles, L. Nagy, J. Wang, Jack C. Straton, James H. Mcguire
Physics Faculty Publications and Presentations
Probabilities and cross sections for ionization plus excitation in helium produced by fast heavy-particle impact have been evaluated. In these calculations, contributions from shake-off, time ordering, and independent interactions of the frozen-target electrons with the projectile are included. A comparison is made to recent experimental observations for the ratio of excitation-ionization to single-ionization total cross sections. A comparison is also made to calculations of excitation-ionization by fast electron impact.
Origins And Effects Of Thermal Processes On Near-Field Optical Probes, Andres H. La Rosa, B. I. Yakobson, H. D. Hallen
Origins And Effects Of Thermal Processes On Near-Field Optical Probes, Andres H. La Rosa, B. I. Yakobson, H. D. Hallen
Physics Faculty Publications and Presentations
An aluminum-coated tapered fiber probe, as used in near-field scanning optical microscopy (NSOM), is heated by the light coupled into it. This can destroy the probe or may modify the sample, which can be problematic or used as a tool. To study these thermal effects, we couple modulated visible light of various power through probes. Simultaneously coupled infrared light senses the thermal effects. We report their magnitude, their spatial and temporal scales, and real-time probe damage observations.Amodel describes the experimental data, the mechanisms for induced IR variation, and their relative importance.
Guest Editorial: Special Section On Photorefractive Nonlinear Optics, Partha P. Banerjee
Guest Editorial: Special Section On Photorefractive Nonlinear Optics, Partha P. Banerjee
Electrical and Computer Engineering Faculty Publications
Hand in hand with experimental work in photorefractives, there is a lot of activity in modeling photorefractive materials and experimental observations in the open literature. This special section contains a paper by Banerjee and Jarem, who use a rigorous coupled wave theory to analyze two- and multiple-wave mixing photorefractive barium titanate, modeled through the Kukhtarev equations.
Broadband Dynamic, Holographically Self-Recorded, And Static Hexagonal Scattering Patterns In Photorefractive Knbo3:Fe, Nickolai Kukhtarev, Tatiana V. Kukhtareva, John Caulfield, Partha P. Banerjee, Hsueh-Ling Yu, Lambertus Hesselink
Broadband Dynamic, Holographically Self-Recorded, And Static Hexagonal Scattering Patterns In Photorefractive Knbo3:Fe, Nickolai Kukhtarev, Tatiana V. Kukhtareva, John Caulfield, Partha P. Banerjee, Hsueh-Ling Yu, Lambertus Hesselink
Electrical and Computer Engineering Faculty Publications
We have observed and explained three types of hexagon pattern formation in photo refractive crystal KNb03:Fe. These are:
- Dynamic (laser induced)
- Semipermanent (holographically stored)
- Permanent (induced by a static domain grid) over a wide wavelength range
A New Photopolymer Recording Material For Holographic Applications: Photochemical And Holographic Studies Towards An Optimized System, Suzanne Martin
A New Photopolymer Recording Material For Holographic Applications: Photochemical And Holographic Studies Towards An Optimized System, Suzanne Martin
Doctoral
Photopolymer materials are a practical alternative to high resolution silver halide photographic emulsions for the recording of holograms and high spatial frequency holographic gratings. The new holographic recording material reported in this thesis consists of a green sensitive dye (erythrosine B), an electron donor (triethanolamine), and a monomer mixture (acrylamide and methylene bisacrylamide) in a polyvinyl alcohol binder. ON illumination with light of the appropriate wavelength the dye absorbs a photon and the excited triplet state of the dye reacts with the electron donor to produce free radicals. These free radicals may then initiate local polymerization of the monomer. The …
Laser Oriented K-36 For Time-Reversal Symmetry Measurements, A. R. Young, W. S. Anderson, F. P. Calaprice, G. D. Cates, Gordon L. Jones, D. A. Krieger, R. B. Vogelaar
Laser Oriented K-36 For Time-Reversal Symmetry Measurements, A. R. Young, W. S. Anderson, F. P. Calaprice, G. D. Cates, Gordon L. Jones, D. A. Krieger, R. B. Vogelaar
Articles
We have produced very large nuclear alignments in radioactive K-36 (half-life 0.34 sec) through laser optical pumping techniques. The K-36 was created through (p,n) reactions using a 50 nA, 22 MeV proton beam, and a 3.3 atmosphere Ar-36 target. Measurements were made with the target cell at room temperature, when direct optical pumping produces nuclear orientation in the K-36, and at elevated temperatures 160 degrees C and 180 degrees C) where the K-36 is oriented through a combination of direct optical pumping and spin exchange. The fraction of the maximal nuclear alignment for the 180 degrees C data was determined …
College Physics Students' Conceptual Understanding Of Area And Volume, And Relationships Between These Concepts And Students' Understanding Of Physics Concepts, Jiang Yu
Dissertations
Concepts such as area and volume are foundational ideas for many concepts introduced in introductory science courses. At the college level, most instructors typically assume that incoming students have already developed an understanding of these underpinning ideas. However, doubt has surfaced in recent years about students' depth of understanding and mastery of these fundamental concepts. Because deficiencies in understanding basic concepts may relate to the learning of subsequent concepts, instructors have expressed concerns about students' understanding of fundamental ideas and if the failure to understand these ideas hinders students' subsequent progress.
This study was designed to (a) investigate the nature …
Structure And Interaction Energies Of Kr Atoms Adsorbed On Graphitic Amorphous Carbon, Sang -Joon Lee
Structure And Interaction Energies Of Kr Atoms Adsorbed On Graphitic Amorphous Carbon, Sang -Joon Lee
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The physisorption of Kr on graphitic amorphous carbon (g-C) has been investigated using a statistical approach. The interaction energy calculation process (i) established a structural model of g-C and (ii) determined the adsorbate-adsorbate and the adsorbate-substrate interaction potentials on g-C.
The structural model of g-C was divided into three regions. For the interaction potential between a Kr atom and a carbon atom the short and medium range order of g-C was described with a discrete medium model based on three ring clusters using ring statistics from Beeman's continuous random network C1120 model of g-C. For the intermediate distance region, Beeman's …
All‐Optical Light Modulation In Bacteriorhodopsin Films, F. J. Aranda, R. Garimella, N. F. Mccarthy, D. Narayana Rao, D.V.G.L.N. Rao, Z. Chen, J. A. Akkar, D. L. Kaplan
All‐Optical Light Modulation In Bacteriorhodopsin Films, F. J. Aranda, R. Garimella, N. F. Mccarthy, D. Narayana Rao, D.V.G.L.N. Rao, Z. Chen, J. A. Akkar, D. L. Kaplan
Physics Faculty Publications
We report a convenient method to obtain all‐optical light modulation in bacteriorhodopsin films using a degenerate four‐wave mixing geometry. Chemically stabilized films of bacteriorhodopsin in a polymer matrix for which the lifetime of the excited M state is tens of seconds were used to demonstrate all‐optical light intensity modulation. The films are observed to be stable over a period of 4 years. Due to the sensitivity of the films, small intensities of order microwatt/ cm2 are required in the modulation experiments. Furthermore the fast photochemical transition from M to B permit reasonably fast modulation speeds independent of the slow …
Numerical Results For The Ground-State Interface In A Random Medium, Alan Middleton
Numerical Results For The Ground-State Interface In A Random Medium, Alan Middleton
Physics - All Scholarship
The problem of determining the ground state of a $d$-dimensional interface embedded in a $(d+1)$-dimensional random medium is treated numerically. Using a minimum-cut algorithm, the exact ground states can be found for a number of problems for which other numerical methods are inexact and slow. In particular, results are presented for the roughness exponents and ground-state energy fluctuations in a random bond Ising model. It is found that the roughness exponent $\zeta = 0.41 \pm 0.01, 0.22 \pm 0.01$, with the related energy exponent being $\theta = 0.84 \pm 0.03, 1.45 \pm 0.04$, in $d = 2, 3$, respectively. These …
Method And Apparatus For Generating Laser Plasma X-Rays, Donald P. Umstadter, Jonathan Workman, Anatoly Maksimchuk, Xinbing Liu
Method And Apparatus For Generating Laser Plasma X-Rays, Donald P. Umstadter, Jonathan Workman, Anatoly Maksimchuk, Xinbing Liu
Donald Umstadter Publications
The present information provides a system and an apparatus to produce x-rays from plasmas by focusing an intense, short duration optical pulse from a laser onto a target. The concentrated energy contained in the focused laser beam ionizes the target material, raising it to a temperature at which ions are produced in a chain reaction ionization, and x-rays are emitted when ions become de-excited (their electrons change energy level) or free electrons recombine with the ions in the plasma. The method comprises controlling pulse time duration of x-rays emitted from a plasma-forming target generating a beam of one or more …
Weak Electron Scattering For The 3he-3h Transition And The Weak Nuclear Form Factors, Michael A. Barnett
Weak Electron Scattering For The 3he-3h Transition And The Weak Nuclear Form Factors, Michael A. Barnett
FIU Electronic Theses and Dissertations
We calculate the differential cross section for weak electron scattering reaction, e + 3He-' 3H + ve, for energies from 100 MeV to 6 GeV as a function of outgoing nucleus angle from 0 to n/2 radians. We find that the differential cross section at low [q2] increases with electron energy from 0.1 GeV to 6.0 GeV, such that the peak value at 6.0 GeV is approximately 3.2 x 10-40 cm 2 / ster, a factor of 10 larger than the peak value at 0.1 GeV. We also find that the width of the peak …