Physical Sciences and Mathematics Commons^™

Invariants Of Twist-Wise Flow Equivalence, Michael C. Sullivan

Articles and Preprints

Flow equivalence of irreducible nontrivial square nonnegative integer matrices is completely determined by two computable invariants, the Parry-Sullivan number and the Bowen-Franks group. Twist-wise flow equivalence is a natural generalization that takes account of twisting in the local stable manifold of the orbits of a flow. Two new invariants in this category are established.

Morphogenesis By Symbiogenesis, Michael J. Chapman, Lynn Margulis

Lynn Margulis (1938 - 2011)

Here we review cases where initiation of morphogenesis, including the differentiation of specialized cells and tissues, has clearly evolved due to cyclical symbiont integration. For reasons of space, our examples are drawn chiefly from the plant, fungal and bacterial kingdoms. Partners live in symbioses and show unique morphological specializations that result when they directly and cyclically interact. We include here brief citations to relevant literature where plant, bacterial or fungal partners alternate independent with entirely integrated living. The independent, or at least physically unassociated stages, are correlated with the appearance of distinctive morphologies that can be traced to the simultaneous …

New Semiregular Divisible Difference Sets, James A. Davis

Department of Math & Statistics Faculty Publications

We modify and generalize the construction by McFarland (1973) in two different ways to construct new semiregular divisible difference sets (DDSs) with λ₁≠0. The parameters of the DDS fall into a family of parameters found in Jungnickel (1982), where his construction is for divisible designs. The final section uses the idea of a K-matrix to find DDSs with a nonelementary abelian forbidden subgroup.

On The Developement Of An Optical Character Recognition(Ocr) System For Printed Bangla Script., Umapada Pal Dr.

Doctoral Theses

This thesis concerns OCR development of machine printed text in an Indian lan- guage, Bangla (Bengali) which is the fourthmost popular language in the world and the secondmost popular language in India.1.1 Optical Character Recognition Optical Character Recognition (OCR) is a process of automatic computer recog- nition of characters in optically scanned and digitized pages of text. OCR is ene of the most fascinating and challenging areas of pattern recognition with various practical applications. It can contribute tremendously to the advancement of an automation process and can improve the interface between man and machine in many applications, including office automation …

Habitat Conservation Plan For Utah Prairie Dogs In Iron County, Utah, Iron County Commission, Utah Division Of Wildlife Resources

All U.S. Government Documents (Utah Regional Depository)

The Utah prairie dog is a federally threatened species that occurs only in southwestern Utah. A large proportion (65%) of the total population of Utah prairie dogs occurs in Iron County, and a high percentage (86%) of those (2,456/2,843 in 1997) occur on privately owned lands. Population growth in Iron County has averaged more than 6% over the last five years, and is expected to continue at least at the same pace, and possibly as high as 10% (Colgan 1997). The increase in both residential and commercial development in Iron County has been the greatest in Cedar City, but has …

Measurements Of The Δ(1232) Transition Form Factor And The Ratio Σn/Σp From Inelastic Electron-Proton And Electron-Deuteron Scattering, L M. Stuart, R S. Hicks, R A. Miskimen, Gerald Alvin Peterson, S H. Rokni

Gerald Alvin Peterson

Measurements of inclusive electron-scattering cross sections using hydrogen and deuterium targets in the region of the Δ(1232) resonance are reported. A global fit to these new data and previous data in the resonance region is also reported for the proton. Transition form factors have been extracted from the proton cross sections for this experiment over the four-momentum transfer squared range 1.64

First Observation Of The Cabibbo Suppressed Decay B+ → D̅0K+, M. Athanas, Kenneth A. Bloom, Cleo Collaboration

Kenneth Bloom Publications

We have observed the decay B⁺ → D̅⁰K⁺, using 3.3 X 10⁶ BB̅ pairs collected with the CLEO II detector at the Cornell Electron Storage Ring. We find the ratio of branching fractions R ≡ Ɓ(B⁺ → D̅⁰K⁺)/Ɓ(B⁺ →D̅⁰π⁺) = 0.055 ± 0.014 ± 0.005.

Multiple Media Correlation: Theory And Applications, Charles B. Owen

Dartmouth College Ph.D Dissertations

This thesis introduces multiple media correlation, a new technology for the automatic alignment of multiple media objects such as text, audio, and video. This research began with the question: what can be learned when multiple multimedia components are analyzed simultaneously? Most ongoing research in computational multimedia has focused on queries, indexing, and retrieval within a single media type. Video is compressed and searched independently of audio, text is indexed without regard to temporal relationships it may have to other media data. Multiple media correlation provides a framework for locating and exploiting correlations between multiple, potentially heterogeneous, media streams. The goal …

Fine Tuning Interface Relaxation Methods For Elliptic Differential Equations, John R. Rice, P. Tsompanopoulou, E. Vavalis

Department of Computer Science Technical Reports

No abstract provided.

Representations, Approximations, And Algorithms For Mathematical Speech Processing, Laura R. Suzuki

Theses and Dissertations

Representing speech signals such that specific characteristics of speech are included is essential in many Air Force and DoD signal processing applications. A mathematical construct called a frame is presented which captures the important time-varying characteristic of speech. Roughly speaking, frames generalize the idea of an orthogonal basis in a Hilbert space, Specific spaces applicable to speech are L₂(R) and the Hardy spaces H_p(D) for p> 1 where D is the unit disk in the complex plane. Results are given for representations in the Hardy spaces involving Carleson's inequalities (and its extensions), …

Charge-Correlation Effects In Calculations Of Atomic Short-Range Order In Metallic Alloys, F. J. Pinksi, J. B. Staunton, Duane D. Johnson

Duane D. Johnson

The “local” chemical environment that surrounds an atom directly influences its electronic charge density. These atomic charge correlations play an important role in describing the Coulomb and total energies for random substitutional alloys. Although the electronic structure may be well represented by a single-site theory, such as the coherent potential approximation, the electrostatic energy is not as well represented when these charge correlations are ignored. For metals, including the average effect from the charge correlation coming from only the nearest-neighbor shell has been shown to be sufficient to determine accurately the energy of formation. In this paper, we incorporate such …

Reactions Of Oxygen Atoms With Van Der Waals Complexes: The Effect Of Complex Formation On The Internal Energy Distribution In The Products, A B. Mccoy, Michael W. Lufaso, M Veneziani, S Atrill, R Naaman

Chemistry Faculty Research and Scholarship

Reactions of atomic oxygen with complexes containing HCl are investigated and the OH product state distributions are compared to those observed for the corresponding reactions of HCl monomers. In previous studies of reactions of O(3P) with HCl and hydrocarbon complexes, rotationally colder OH product state distributions were observed, when compared to the corresponding reactions of monomers. In contrast, we find that reactions of O(1D) with HCl clusters yield OH rotational distributions that are unaffected by the incorporation of HCl into a van der Waals complex. Quasiclassical trajectories are run on collisions of oxygen with HCl and Ar⋯HCl at 1 eV …

The Influence Of Enhanced Surface Magnetism On Finite-Size Scaling, C. Waldfried, T. Mcavoy, D. Welipitiya, Peter A. Dowben, Elio Vescovo

Peter Dowben Publications

The thickness-dependent spin-polarized electronic structure of strained ultrathin and thin films of Gd has been investigated. The surface magnetic structure dominates the magnetic ordering of the ultrathin Gd films. With decreasing thickness some bulk bands exhibit increasingly more "passive" magnetic behavior. These bulk bands resemble a paramagnet over an increasing volume of the bulk Brillouin zone with decreasing film thickness.

Solute-Solvent Pair Distribution Functions In Highly Asymmetric Additive Hard Sphere Mixtures, Douglas Henderson, Kwong-Yu Chan

Faculty Publications

Contact values for the solute-solvent pair distribution function in an additive hard sphere mixture, as computed from the Henderson-Chan (HC) formulas, are compared with the recent Monte Carlo (MC) data and formula of Matyushov and Ladanyi (ML) [J. Chem. Phys. 107, 5815 (1997)]. The agreement is found to be excellent. The negative finding of ML is due to a misprint in one of the HC publications. We find the HC formula to be superior to the ML formula when compared to our MC data [Mol. Phys. 91, 1137 (1997)] for the case where the ratio of diameters is large and …

H2 Formation On Interstellar Grains In Different Physical Regimes, Gianfranco Vidali, Ofer Biham, Itay Furman, N. Katz, Valerio Pirronello

Physics - All Scholarship

An analysis of the kinetics of H2 formation on interstellar dust grains is presented using rate equations. It is shown that semi-empirical expressions that appeared in the literature represent two different physical regimes. In particular, it is shown that the expression given by Hollenbach, Werner and Salpeter [ApJ, 163, 165 (1971)] applies when high flux, or high mobility, of H atoms on the surface of a grain, makes it very unlikely that H atoms evaporate before they meet each other and recombine. The expression of Pirronello et al.\ [ApJ, 483, L131 (1997)] -- deduced on the basis of accurate measurements …

Absolute Triply Differential (E, 2e) Cross Sections For He In The Intermediate Energy Region With Comparison To Theory, J. Röder, H. Ehrhardt, Cheng Pan, Anthony F. Starace, Igor Bray, Dmitry V. Fursa

Anthony F. Starace Publications

Absolute triply differential (e, 2e) cross section measurements are presented for He at incident energies E₀ = 32.6, 44.6, 64.6, and 104.6 eV with equal energy sharing and the θ₁₂ = π configuration. Results of distorted partial-wave calculations agree with the measurements; those of convergent close-coupling calculations agree with the relative angular distributions, and with absolute values after rescaling by consideration of the singly differential cross section.

Pion-Pion Scattering In Two Dimensions, Joseph Schechter, D. Delphenich, S. Vaidya

Physics - All Scholarship

Massive two-flavor QED_2 is known to have many similarities to the two-flavor QCD_4. Here we compare the \pi-\pi scattering amplitudes (actually an analog process in QED_2) of the two theories. The QED_2 amplitude is computed from the bosonized version of the model while the QCD_4 amplitude is computed from an effective low energy chiral Lagrangian. A number of interesting features are noted. For example, the contribution of the two-dimensional Wess-Zumino-Witten (WZW) term in QED_2 is structurally identical to the vector meson exchange contribution in QCD_4. Also it is shown that the QED_2 amplitude computed at tree level is a reasonable …

Steps Toward Determination Of The Size And Structure Of The Broad-Line Region In Active Galactic Nuclei. Xiv. Intensive Optical Spectrophotometric Observations Of Ngc 7469, S.J. Collier, Keith Horne, Shai Kaspi, Hagai Netzer, Bradley M. Peterson, I. Wanders, T. Alexander, R. Bertram, A. Comastri, C. Martin Gaskell, Yu. F. Malkov, D. Maoz, M. Mignoli, Richard William Pogge, V.I. Pronik, S.G. Sergeev, Stephanie A. Snedden, G.M. Stirpe, N.G. Bochkarev, A.N. Burenkov, A.I. Shapovalova, R.M. Wagner

C. Martin Gaskell Publications

We present results of an intensive 2 month campaign of ground-based spectrophotometric monitoring of the Seyfert 1 galaxy NGC 7469, with a temporal resolution [approximately less than]1 day. The broad Hα and Hβ emission lines respond to ~35% ultraviolet continuum variations with an amplitude of ~10% and time delays of 5.6±1.3 days and 5.4±0.8 days, respectively. We interpret this as evidence of variable Balmer line gas ~5-6 light days from the central source in this object, widely believed to be a supermassive black hole. The virial mass of the central source implied by line widths and time delays is ~10 …

Recreation Management By The Blm: A Local Perspective, Ann Morgan

Outdoor Recreation: Promise and Peril in the New West (Summer Conference, June 8-10)

10 pages.

Outdoor Recreation And Water Development: The National Recreation Lakes Study, Bruce R. Brown

Outdoor Recreation: Promise and Peril in the New West (Summer Conference, June 8-10)

12 pages.

One State’S Response To Outdoor Recreation Pressures, Laurie Mathews

Outdoor Recreation: Promise and Peril in the New West (Summer Conference, June 8-10)

5 pages.

Public Issues In Parks And Recreation Activity In The 105th Congress, Barry S. Tindall

Outdoor Recreation: Promise and Peril in the New West (Summer Conference, June 8-10)

3 pages.

The New Challenge Of Outdoor Recreation, Roz Mcclellan

Outdoor Recreation: Promise and Peril in the New West (Summer Conference, June 8-10)

5 pages.

Precise Measurements Help Gauge Pacific Northwest's Earthquake Potential, M. Meghan Miller, Herb Dragert, Elliot Endo, Jeffrey T. Freymueller, Chris Goldfinger, Harvey M. Kelsey, Eugene D. Humphreys, Daniel J. Johnson, Robert Mccaffrey, John S. Oldow, Anthony Qamar, Charles M. Rubin

Geological Sciences Faculty Scholarship

Except for the recent rumblings of a few moderate earthquakes and the eruption of Mt. St. Helen's, all has been relatively quiet on the Pacific Northwestern front. The Cascades region in the Pacific Northwest, a sporadically active earthquake and volcanic zone, still has great seismic potential [Atwater, 1987], as comparisons with other subduction zones around the world have shown [Heaton and Kanamori, 1984]. Recent tsunami propagation models [Satake, 1996] and tree ring studies suggest that the last great Cascadia earthquake occurred in the winter of 1700 A.D. and had a magnitude of −8.9. The …

Field-Level Conflict Management In Outdoor Recreation, James B. Webb

Outdoor Recreation: Promise and Peril in the New West (Summer Conference, June 8-10)

7 pages.

Fish And Wildlife Funding—Past And Future [Abstract], R. Max Peterson

Outdoor Recreation: Promise and Peril in the New West (Summer Conference, June 8-10)

1 page.

Field Level Conflict Management In Outdoor Recreation, Arden Anderson

Outdoor Recreation: Promise and Peril in the New West (Summer Conference, June 8-10)

16 pages.

Contains references.

The Limitations Of A Market-Based Outdoor Recreation Policy: Reasons For Caution, Scott Silver

Outdoor Recreation: Promise and Peril in the New West (Summer Conference, June 8-10)

13 pages (includes illustrations).

Contains references.

The User Fee Approach To Hunting And Fishing Finance: The “Teaming With Wildlife” Proposal, R. Max Peterson

Outdoor Recreation: Promise and Peril in the New West (Summer Conference, June 8-10)

18 pages (includes color illustrations).

Contains footnotes.

Market Solutions To Public Recreation Finance: The Texas State Parks Example, Donald R. Leal

Outdoor Recreation: Promise and Peril in the New West (Summer Conference, June 8-10)

11 pages.

Contains 1 page of references.