Physical Sciences and Mathematics Commons^™

Search For Exchange-Antisymmetric Two-Photon States, D. Demille, D. Budker, N. Derr, Edward Deveney

Physics Faculty Publications

Atomic two-photon J = 0↔J^′ = 1 transitions are forbidden for photons of the same energy. This selection rule is related to the fact that photons obey Bose-Einstein statistics. We have searched for small violations of this selection rule by studying transitions in atomic Ba. We set a limit on the probability v that photons are in exchange-antisymmetric states: v<1.2×10^-7.

Front Matter

Journal of the Minnesota Academy of Science

No abstract provided.

Symposia

Journal of the Minnesota Academy of Science

Abstracts from the Symposia Papers given at the 67^th Annual Meeting for the Journal of the Minnesota Academy of Science.

Winchell Papers

Journal of the Minnesota Academy of Science

Abstracts from the Winchell Papers given at the 67^th Annual Meeting for the Journal of the Minnesota Academy of Science.

Winchell Posters

Journal of the Minnesota Academy of Science

Abstracts from the Winchell Posters given at the 67^th Annual Meeting for the Journal of the Minnesota Academy of Science.

Supplement To "On Translations Of Quadratic Residues", Bruce Brandt

Journal of the Minnesota Academy of Science

Let n and k be arbitrary positive integers. We will tend to be concerned with small k and with n which are several times k!. I stated two conditions on (n, k) in a previous paper; in this paper I restate them and further explore them. In particular, it is proven that if n is the least number satisfying Condition 1 for a certain k, then the least number for k + l must be at least 2n + l. Condition 1 and Condition 2 are rephrased graph-theoretically. A heuristic explanation for why the quadratic. residues tend to satisfy Condition …

Effect Of Human Disturbance On Small Mammal Communities In Itasca State Park, Minnesota, Nancy L. Staus, Kathleen Conforti, Leslie N. Clapper, Jennifer A. Longhenry, C. C. Schoenbauer, Michael S. Rentz, John R. Tester

Journal of the Minnesota Academy of Science

We determined effects of different levels of human disturbance on small mammal richness and relative abundance from live-trapping data obtained in Itasca State Park in northwestern Minnesota. We developed a quantitative measure of human disturbance based on disturbance units and trapped small mammals on three study sites, each reflecting a different level of disturbance. Our data revealed that small mammal diversity decreased with increasing human disturbance. Amount of ground cover and litter depth also appeared to be important in explaining differences in the demographic patterns of small mammals among sites.

Colder By The Lake? The Lake Effect On Static Air Temperatures In Duluth, Minnesota 1961-1990, Graham A. Tobin, Gordon L. Levine, Jacqueline H. Alexander

Journal of the Minnesota Academy of Science

To test the impact of Lake Superior on local climates, daily temperature data were collected from two weather stations in Duluth, Minnesota for the period 1961 through 1990. The broad goal of the research was to ascertain to what extent climate conditions differed between lakeside and inland locations. Temperature data were standardized to local lake-level to control for altitudinal differences between weather stations. These data were then analyzed at two temporal scales, annual and seasonal, with the focus on mean high and mean low temperatures. Results indicated that the moderating effect of the lake indeed was apparent especially in raising …

Sextic Number Fields With Discriminant -J2A3B, John W. Jones, David P. Roberts

Mathematics Publications

. Complete lists of number fields, of given degree n and unramified outside a given finite set S of primes, are both of intrinsic interest and useful in some applications. For degrees n ≤ 5 and S = {∞, 2, 3}, the complete lists have appeared previously; there are in total 85 such fields. Here we give the complete list for n = 6 and S = {∞, 2, 3}, finding in particular exactly 398 such fields. We use a three-pronged approach to obtain this classification: an exhaustive computer search, sextic twinning, and class field theory. Also we completely identify …

Stability Of A Semilinear Cauchy Problem, Yi Liu, Yi Li, Yinbin Deng

Mathematics and Statistics Faculty Publications

A report of progress in linear and nonlinear partial differential equations, microlocal analysis, singular partial differential operators, spectral analysis and hyperfunction theory. The papers aretaken from a conference on partial differential equations and their applications, held in Wuhan.

On The Exactness Of An S-Shaped Bifurcation Curve, Philip Korman, Yi Li

Mathematics and Statistics Faculty Publications

For a class of two-point boundary value problems we prove exactness of an S-shaped bifurcation curve. Our result applies to a problem from combustion theory, which involves nonlinearities like for .

Evolved, Single, Slowly Rotating . . . But Magnetically Active The G8-Giant Hr 1362 = Ek Eridani Revisited, Klaus G. Strassmeier, Kazimierz Stępień, Gregory W. Henry, Douglas S. Hall

Information Systems and Engineering Management Research Publications

We rediscuss the unusual case of the slowly rotating late-type giant HR 1362, which exhibits a very unusual high level of magnetic activity. New BVRI photometry from two robotic telescopes from 1991 through 1998 together with previously published photometric data gives a very precise photometric period of 306.9±0.4 days. With the aid of high-resolution (R=120,000) optical spectra and the Hipparcos parallax we redetermine the absolute parameters of HR 1362 and find it to be a single G8IV-III star of 14 L and a mass of 1.85 M with Teff=5125 K, log g=3.25, and solar abundances. Lithium is not significantly different …

The Visual Orbit Of Ι Pegasi, Andrew F. Boden, Christopher D. Koresko, Gerard T. Van Belle, Mark M. Colavita, Philip J. Dumont, Joseph Gubler, Shrinivas R. Kulkarni, Benjamin F. Lane, Dasia Mobley, Michael Shao, James K. Wallace, The Pti Collaboration, Gregory W. Henry

Information Systems and Engineering Management Research Publications

We have determined the visual orbit for the spectroscopic binary ι Pegasi with interferometric visibility data obtained by the Palomar Testbed Interferometer in 1997. ι Peg is a double-lined binary system whose minimum masses and spectral typing suggests the possibility of eclipses. Our orbital and component diameter determinations do not favor the eclipse hypothesis: the limb-to-limb separation of the two components is 0.151±0.069 mas at conjunction. Our conclusion that the ι Peg system does not eclipse is supported by high-precision photometric observations. The physical parameters implied by our visual orbit and the spectroscopic orbit of Fekel & Tomkin are in …

Hd 62454 And Hd 68192: Two New Γ Doradus Variables, Anthony B. Kaye, Gregory W. Henry, Francis C. Fekel, Richard O. Gray, Eloy Rodríguez, Susana Martín, Douglas R. Gies, William G. Bagnuolo, Douglas S. Hall

Information Systems and Engineering Management Research Publications

We present multilongitude, multicolor photometry and simultaneous high-resolution, high signal-to-noise spectroscopy of the newly discovered γ Doradus variables HD 62454 and HD 68192. From combined Johnson and Strömgren data, we are able to identify five independent periods in HD 62454 and two stable periods in HD 68192. The data presented are sufficient to rule out all physically meaningful types of variations, with the one exception of the high-order, low-degree, nonradial gravity-mode pulsations that are believed to be at work in γ Doradus stars. We also find that HD 62454 is a double-lined spectroscopic binary and we present an orbital solution.

Bargaining With Deadlines, Tuomas Sandholm, Nir Vulkan

All Computer Science and Engineering Research

This paper analyzes automated distributive negotiation where agents have firm deadlines that are private information. The agents are allowed to make and accept offers in any order in continuous time. We show that the only sequential equilibrum outcome is the one where the agents wait until the first deadline, at which point that agent concedes everything to the other. This holds for pure and mixed strategies. So, interestingly, rational agents can never agree to a nontrivial split because offers signal enough weakness of bargaining power (early deadline) so that the recipient should never accept. Similarly, the offerer knows that it …

Constructing Speculative Demand Functions In Equilibrium Markets, Tuomas Sandholm, Fredrik Ygge

All Computer Science and Engineering Research

In computational markets utilizing algorithms that establish a general equilibrium, competitive behavior is usually assumed: each agent makes its demand (supply) decisions so as to maximize its utility (profit) assuming that it has no impact on market prices. However, there is a potential gain from strategic behavior via speculating about others because an agent does affect the market prices, which affect the supply/demand decisions of others, which again affect the market prices that the agent faces. Determining the optimal strategy when the speculator has perfect knowledge about the other agents is a well known problem which has been studied in …

Chemistry Reform Takes Root In University Settingeforms In Mathematics And Science, Thomas Pentecost

Peer Reviewed Articles

Which of the following scenarios is more attractive?

(1) You arrive for chemistry class and listen and watch an

instructor work problems about gas laws for fifty minutes.

(2) You arrive for class and you and a few other classmates anake

data about the relationship between pressure and volume and develop

the gas laws based on data.

Table Of Contents Volume 10, Number One, Winter 1999, Risk Editorial Board

RISK: Health, Safety & Environment (1990-2002)

Table of contents for the journal RISK: Health, Safety & Environment (ISSN: 1073-8673)

The Role Of Trust In The North Blackforest: An Evaluation Of A Citizen Panel Project, Ragnar E. Löfstedt

RISK: Health, Safety & Environment (1990-2002)

Dr. Löfstedt explores the effectiveness of a public participation project conducted in Germany, designed to involve citizens in the siting of municipal waste disposal plants.

Expert And Lay Mental Models Of Ecosystems: Inferences For Risk Communication, Jeffrey K. Lazo, Jason Kinnell, Toby Bussa, Ann Fisher, Nathan Collamer

RISK: Health, Safety & Environment (1990-2002)

The authors evaluate a mental modeling approach to studying differences between lay and expert comprehension of ecosystems.

Designing An Analytic Deliberative Process For Environmental Health Policy Making In The U.S. Nuclear Weapons Complex, Seth Tuler, Thomas Webler

RISK: Health, Safety & Environment (1990-2002)

Using a National Research Council Report as a centerpiece, Drs. Tuler and Webler evaluate the effectiveness of a conceptual approach to risk policy-making.

Review Of: Federal Judge's Desk Reference To Environmental Economics (John A. Baden, Ed.; Pacific Research Institute 1998), Edward J. Hendrick Jr.

RISK: Health, Safety & Environment (1990-2002)

Review of the book: Federal Judge's Desk Reference to Environmental Economics (John A. Baden, ed.; Pacific Research Institute 1998). Dedication, forward, glossary, section introductions. LC 98-9206; ISBN 0-936488-84-0. [324 pp. paper. 755 Sansone Street, Ste. 450, San Francisco, CA. 94111. http:// www.pacificserch.org].

Oceanographic Center Catalog 1999-2000, Nova Southeastern University

Halmos College of Natural Sciences and Oceanography Course Catalogs

No abstract provided.

New Weighing Matrices And Orthogonal Designs Constructed Using Two Sequences With Zero Autocorrelation Function - A Review, C. Koukouvinos, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

The book, Orthogonal Designs: Quadratic Forms and Hadamard Matrices, Marcel Dekker, New York-Basel, 1979, by A. V. Geramita and Jennifer Seberry, has now been out of print for almost two decades. Many of the results on weighing matrices presented therein have been greatly improved. Here we review the theory, restate some results which are no longer available and expand on the existence of many new weighing matrices and orthogonal designs of order 2n where n is odd. We give a number of new constructions for orthogonal designs. Then using number theory, linear algebra and computer searches we find new weighing …

Crypto Topics And Applications Ii, Jennifer Seberry, C. Charnes, J. Pieprzyk, R. Safavi-Naini

Faculty of Informatics - Papers (Archive)

In this chapter we continue our exposition of the crypto topics which was begun in the previous chapter. This chapter covers: Secret Sharing, Threshold Cryptography, Signature Schemes, and finally Quantum Key Distribution and Quantum Cryptography. As in the previous chapter, we have focused only on the essentials of each topic. We have included in the bibliography sufficient items which can be consulted for further details.

Crypto Topics And Applications I, Jennifer Seberry, C. Charnes, J. Pieprzyk, R. Safavi-Naini

Faculty of Informatics - Papers (Archive)

In this chapter we discuss four related areas of cryptology, namely: Authentication, Hashing, Message Authentication Codes (MACs), and Digital Signatures. These topics represent currently active and growing research topics in cryptology. Due to space limitations, we concentrate only on the essential aspects of each topic. The bibliography is intended to supplement our survey. We have included sufficiently many items to provide the interested reader with an overall view of the current state of knowledge in the above areas.

Gasturbnlab Pse Design, Sanford Fleeter, Elias N. Houstis, John R. Rice, Chem Zhou

Department of Computer Science Technical Reports

No abstract provided.

A Framework For Building Collaborative Network Agents, Ladislau Bölöni, Dan C. Marinescu

Department of Computer Science Technical Reports

No abstract provided.

Computer-Assisted Kinematic Tolerance Analysis Of A Gear Selector Mechanism With The Configuration Space Method, Elisha P. Sacks, Leo Joskowicz, Ralf Schultheiss, Uwe Hinze

Department of Computer Science Technical Reports

No abstract provided.

The Stable Manifold Theorem For Stochastic Differential Equations, Salah-Eldin A. Mohammed, Michael K. R. Scheutzow

Articles and Preprints

We formulate and prove a local stable manifold theorem for stochastic differential equations (SDEs) that are driven by spatial Kunita-type semimartingales with stationary ergodic increments. Both Stratonovich and Itô-type equations are treated. Starting with the existence of a stochastic flow for a SDE, we introduce the notion of a hyperbolic stationary trajectory. We prove the existence of invariant random stable and unstable manifolds in the neighborhood of the hyperbolic stationary solution. For Stratonovich SDEs, the stable and unstable manifolds are dynamically characterized using forward and backward solutions of the anticipating SDE. The proof of the stable manifold theorem is based …