Physical Sciences and Mathematics Commons^™

The Virginia Wetlands Report Vol. 12, No. 2, Virginia Institute Of Marine Science

Virginia Wetlands Reports

• Brown Pelican. Julie G. Bradshaw
• Spot. Lyle Varnell
• Fish Lesions, Pfiesteria and the Chesapeake Bay
• GIS as a Tool for Planning and Evaluating Wetland Mitigation Compensation Sites. Marcia Berman
• Wetlands Mitigation Banks: Creating Big Wetlands to Compensate for many Small Losses. Carl Hershner
• Wetlands Protection and Restoration Goals
• Peat: Use Through the Centuries. Pam Mason
• Does my erosion control structure affect my neighbor’s shoreline? William Roberts

Hybrid Probabilistic Programs, Alex Dekhtyar, V. S. Subrahmanian

Computer Science and Software Engineering

The precise probability of a compound event (e.g. e₁ V e₂, e₁ Ʌ e₂) depends upon the known relationships (e.g. independence, mutual exclusion, ignorance of any relationship, etc.) between the primitive events that constitute the compound event. To date, most research on probabilistic logic programming [20, 24, 25, 26] has assumed that we are ignorant of the relationship between primitive events. Likewise, most research in AI (e.g. Bayesian approaches) has assumed that primitive events are independent. In this paper, we propose a hybrid probabilistic logic programming language in which the user can explicitly associate, …

Sontrac-A Low Background, Large Area Solar Neutron Spectrometer, C B. Wunderer, D Holslin, John R. Macri, Mark L. Mcconnell, James M. Ryan

Space Science Center

SONTRAC will measure 20-250 MeV neutrons from solar flares using scintillator fibers viewed by CCD cameras to track neutron-proton scatters. SONTRAC can also be used to track gamma rays above 20 MeV. Veto shields are used to reject all charged particles. Gamma-ray and neutron events have very different track densities, allowing discrimination between the two. Double neutron-proton scatters allow unambiguous determination of the incident neutron energy and direction. Therefore, SONTRAC is capable of rejecting almost all background except neutrons from the solar direction. SONTRAC would have detected the June 15, 1991 flare with 42σ for 20-100 MeV neutrons, having an …

Metastable States In Classical And Quantum Systems, Mark Makela, Samantha Parmley, Roger Yu

All Faculty Scholarship for the College of the Sciences

The classical vibrational metastable states in a one-dimensional two-mass system are investigated experimentally and theoretically via the transmission of a coherent wave packet propagating through the system. The Fourier transform of the vibrational signal recorded in between the masses reveals resonant excitations by the coherent wave packet. The time-resolved spectrum indicates that the lifetime of a metastable state of higher frequency is longer than that of lower frequency, which is in contrast with the quantum mechanical double-barrier system. This study, which is easily accessible to physics majors, also demonstrates quantum resonant tunneling in a very simple classical way.

Detection Of Volcanic Ash Clouds From Nimbus 7/Total Ozone Mapping Spectrometer, C. J. Seftor, N. C. Hsu, J. R. Herman, P. K. Bhartia, O. Torres, William I. Rose, David J. Schneider, N. Krotkov

Department of Geological and Mining Engineering and Sciences Publications

Measured radiances from the Version 7 reprocessing of the Nimbus 7/total ozone mapping spectrometer (TOMS) 340- and 380-nm channels are used to detect absorbing particulates injected into the atmosphere after the El Chichon eruption on April 4, 1982. It is shown that while the single-channel reflectivity determined from the 380-nm channel is able to detect clouds and haze composed of nonabsorbing aerosols, the spectral contrast between the 340- and 380-nm channels is sensitive to absorbing particulates such as volcanic ash, desert dust, or smoke from biomass burning. In this paper the spectral contrast between these two channels is used to …

Simulations Of The Atlantic Ocean With A Free Surface Sigma Coordinate Ocean Model, Tal Ezer, George L. Mellor

CCPO Publications

A sigma coordinate, free surface numerical model with turbulence dynamics has been implemented for the Atlantic Ocean and the Greenland Sea, from 80°S to 80°N. It is driven at the surface by monthly mean sea surface temperature and wind stress climatologies and is executed for 30 years. This is the first time that a model of this type, previously used mostly for coastal and regional simulations, has been implemented for the entire Atlantic Ocean and run for a long period of time. The model horizontal circulation, thermohaline overturning circulation, and meridional heat fluxes are described; the results are compared with …

Circulation, Vol. 4, No. 4, Center For Coastal Physical Oceanography, Old Dominion University

CCPO Circulation

Summer 1997 issue of CCPO Circulation featuring article "HF Radar: Is It Ready for Prime Time"

Bern Porter International: Volume 1 Number 1 (Summer, 1997), Bern Porter, Sheila Holtz, Natasha Bernstein

Newsletters

A Literary Newspaper

Featuring the Bern Porter International mission statement with an introduction to the Institute of Advanced Thinking and Porter's literary philosophy.

Mail Server Installation And Integration, Tim Lewis

Honors Capstone Projects and Theses

No abstract provided.

Calculation Of Heavy Ion Inactivation And Mutation Rates In Radial Dose Model Of Track Structure, Francis A. Cucinotta, John W. Wilson, Mark R. Shavers, Robert Katz

Robert Katz Publications

In the track structure model, the inactivation cross section is found by summing an inactivation probability over all impact parameters from the ion to the sensitive sites within the cell nucleus. The inactivation probability is evaluated by using the dose response of the system to gamma rays and the radial dose of the ions and may be equal to unity at small impact parameters. We apply the track structure model to recent data with heavy ion beams irradiating biological samples of E. Coli, Bacillus Subtilis spores, and Chinese hamster (V79) cells. Heavy ions have observed cross sections for inactivation that …

39. Shu Kambara, Otto Vogl, Seiichi Nakahama

Otto Vogl

No abstract provided.

An Analysis Of Tropical Transport: Influence Of The Quasi-Biennial Oscillation, Eugene C. Cordero, S. Randolph Kawa, Mark R. Schoeberl

Faculty Publications, Meteorology and Climate Science

An analysis of over 4 years of Upper Atmosphere Research Satellite (UARS) measurements of CH₄, HF, O₃, and zonal wind are used to study the influence of the quasi-biennial oscillation (QBO) on constituent transport in the tropics. At the equator, spectral analysis of the Halogen Occultation Experiment (HALOE) and Microwave Limb Sounder (MLS) observations reveals QBO signals in constituent and temperature fields at altitudes between 20 and 45 km. Between these altitudes, the location of the maximum QBO amplitude roughly corresponds with the location of the largest vertical gradient in the constituent field. Thus, at 40 …

What Kind Of Thing Is A Number?: A Talk With Reuben Hersh, Reuben Hersh

Humanistic Mathematics Network Journal

No abstract provided.

Math Lingo Vs. Plain English: Multiple Entendre, Stephen I. Brown

Humanistic Mathematics Network Journal

No abstract provided.

Abe Shenitzer At 75, Hardy Grant

Humanistic Mathematics Network Journal

No abstract provided.

A Brief Tribute To Π, J. D. Phillips

Humanistic Mathematics Network Journal

No abstract provided.

Reminiscences Of Paul Erdös (1913-1996), Melvin Henriksen

Humanistic Mathematics Network Journal

No abstract provided.

Sand Songs: The Formal Languages Of Warlpiri Iconography, James V. Rauff

Humanistic Mathematics Network Journal

No abstract provided.

Book Review: The Crest Of The Peacock: Non-European Roots Of Mathematics,By George Gheverghese Joseph, Bernadette Anne Berken

Humanistic Mathematics Network Journal

No abstract provided.

Illumination And Geometry In Islamic Art, Salma Marani

Humanistic Mathematics Network Journal

No abstract provided.

Al-Khawarizmi's Algebra: The First Paradigm In Algebra, Murad Jurdak

Humanistic Mathematics Network Journal

No abstract provided.

See-Duction: How Scientists And Artists Are Creating A Third Way Of Knowing, Howard Levine

Humanistic Mathematics Network Journal

No abstract provided.

Curriculum Development Via Literary And Musical Forms, Joel K. Haack

Humanistic Mathematics Network Journal

No abstract provided.

Algebra Anyone?, Leslie Jones, Ted Panitz, Walter Burlage

Humanistic Mathematics Network Journal

No abstract provided.

Mathematical Rebuses, Arthur V. Johnson Ii

Humanistic Mathematics Network Journal

No abstract provided.

The First Cams Project: A Humanistic Endeavor, Barbara A. Wainwright, Homer W. Austin

Humanistic Mathematics Network Journal

No abstract provided.

Book Reviews: Uncommon Sense, By Alan Cromer, And The Physics Of Immortality, By Frank J. Tipler, Harald M. Ness

Humanistic Mathematics Network Journal

No abstract provided.

On-Line File Caching, Neal E. Young

Computer Science Technical Reports

Consider the following file caching problem: in response to a sequence of requests for files, where each file has a specified size and retrieval cost, maintain a cache of files of total size at most some specified k so as to minimize the total retrieval cost. Specifically, when a requested file is not in the cache, bring it into the cache, pay the retrieval cost, and choose files to remove from the cache so that the total size of files in the cache is at most k. This problem generalizes previous paging and caching problems by allowing objects of arbitrary …

Santa Clara Magazine, Volume 39 Number 2, Summer 1997, Santa Clara University

Santa Clara Magazine

6 - THE BEST TEST SCORE MONEY CAN BUY If you can afford it, taking a cram course can make a difference. But does a higher score indicate the breadth of your knowledge or just the thickness of your wallet? By Jeff Brazil '85

12 - THE FUTURE OF HISTORY MAJORS Studying the past can lead to present-day success. By Kathryn Bold '81

16 - BITTER HARVEST Researchers witness the impact of civil war, famine, and Islamic militants on life in a Sudanese village. By Susan Frey

Fixpunktsemantik Logischer Programme, Pascal Hitzler

Computer Science and Engineering Faculty Publications

No abstract provided.