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2001

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Articles 661 - 690 of 3030

Full-Text Articles in Physical Sciences and Mathematics

Ascent And Decompression Of Viscous Vesicular Magma In A Volcanic Conduit, Helene Massol, Claude Jaupart, Darrell Pepper Aug 2001

Ascent And Decompression Of Viscous Vesicular Magma In A Volcanic Conduit, Helene Massol, Claude Jaupart, Darrell Pepper

Mechanical Engineering Faculty Research

During eruption, lava domes and flows may become unstable and generate dangerous explosions. Fossil lava-filled eruption conduits and ancient lava flows are often characterized by complex internal variations of gas content. These observations indicate a need for accurate predictions of the distribution of gas content and bubble pressure in an eruption conduit. Bubbly magma behaves as a compressible viscous liquid involving three different pressures: those of the gas and magma phases, and that of the exterior. To solve for these three different pressures, one must account for expansion in all directions and hence for both horizontal and vertical velocity components. …

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Statistics And Supermetallicity: The Metallicity Of Ngc 6791, B. J. Taylor Aug 2001

Statistics And Supermetallicity: The Metallicity Of Ngc 6791, B. J. Taylor

Faculty Publications

For the old galactic cluster NGC 6791, Peterson & Green (1998a) and Chaboyer et al. (1999) have found that [Fe/H] approximately + 0.4 dex. A second look at that conclusion is taken in this paper. Zero-point problems are reviewed for a high-dispersion analysis done by Peterson & Green, and it is found that accidental errors have not been determined rigorously for the results of that analysis. It is also noted that in a color-magnitude analysis performed by Chaboyer et al., the important metallicity range between 0.0 and + 0.3 dex is not explored and hence is not ruled out. Moreover, …

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Experimental Diatom Dissolution And The Quantification Of Microfossil Preservation In Sediments, D. B. Ryves, S. Juggins, Sherilyn C. Fritz, R. W. Battarbee Aug 2001

Experimental Diatom Dissolution And The Quantification Of Microfossil Preservation In Sediments, D. B. Ryves, S. Juggins, Sherilyn C. Fritz, R. W. Battarbee

Department of Earth and Atmospheric Sciences: Faculty Publications

Four laboratory experiments on fresh, modern diatoms collected from lakes in the Northern Great Plains of North America were carried out to assess the effects of dissolution on diatom abundance and composition. Marked differences in mean dissolution susceptibility exist between species, despite sometimes significant intra- specific variation between heterovalves. Twenty-four taxa were ranked according to susceptibility to dissolution using an exponential decay model of valve abundance. This dissolution ranking was used to derive two weighted indices of sample preservation. A third index (F) was based on a simple binary classification of valve morphology into dissolved and pristine categories, …

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New And Export Productivity Regulation By Si And Fe In The Equatorial Pacific Ocean, Fei Chai Aug 2001

New And Export Productivity Regulation By Si And Fe In The Equatorial Pacific Ocean, Fei Chai

University of Maine Office of Research Administration: Grant Reports

To identify and quantify the principal processes that control the partitioning of carbon among oceanic reservoirs and between the ocean and atmosphere on focal and regional scales, with a view towards synthesis and prediction on a global scale, is a specific goal of the U.S. JGOFS Synthesis and Modeling Project. As a contribution towards achieving this goal, Drs. Barber, Peng, Chai and Dugdale will develop an ecosystem model for the equatorial Pacific Ocean, with a focus on how silicate and iron affect new and export productivity and the partitioning of carbon between the atmosphere, surface ocean and deep ocean. The …

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Oral History Interview With Glenn Henry, Philip L. Frana Aug 2001

Oral History Interview With Glenn Henry, Philip L. Frana

Philip L Frana

Glenn Henry begins by briefly outlining his education and early work career prior to joining IBM. The majority of the interview focuses on Henry's work as a software systems engineer and manager at IBM in the 1970s. Henry was centrally involved in the software development and hardware definitions for IBM's early Midrange Series computers. He had managerial roles at IBM San Jose and IBM Boca Raton before leading a large team at the home of IBM Midrange Series hardware and software development, IBM Rochester. He details the ...

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Search For Heavy Particles Decaying Into Electron-Positron Pairs In Pp̅ Collisions, V. M. Abazov, Gregory R. Snow, D0 Collaboration Aug 2001

Search For Heavy Particles Decaying Into Electron-Positron Pairs In Pp̅ Collisions, V. M. Abazov, Gregory R. Snow, D0 Collaboration

Gregory Snow Publications

We present results of searches for technirho (ρT), techniomega (ωT), and Z ′ particles, using the decay channels ρT, ωT, Z ′ → ℯ+ℯ-. The search is based on 124.8 pb-1 of data collected by the D0 detector at the Fermilab Tevatron during 1992–1996. In the absence of a signal, we set 95% C.L. upper limits on the cross sections for the processes pp̅ → ρT, ωT, Z ′ → ℯ+ℯ- as a function of the mass of the decaying …

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Emersion Stress In Intertidal Seaweeds: Role Of Active Oxygen, Ian R. Davison Aug 2001

Emersion Stress In Intertidal Seaweeds: Role Of Active Oxygen, Ian R. Davison

University of Maine Office of Research Administration: Grant Reports

The study will examine stress-tolerance in two major groups of perennial intertidal macroalgae, the red and brown seaweeds. The research will test the hypothesis that active oxygen is involved in emersion stress of intertidal seaweeds. Damage due to active oxygen will be determined in stress-tolerant and stress- susceptible species exposed to emersion stress by measuring the peroxidation of membrane lipids. Plants will be grown in laboratory culture under conditions that increase their ability to withstand emersion stress. If the research hypothesis is correct, increases in stress tolerance should be associated with increased levels of antioxidants and/or protective enzymes. The proposed …

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Yang-Lee Edge Singularities From Experimental High Field Magnetization Data, Christian Binek Aug 2001

Yang-Lee Edge Singularities From Experimental High Field Magnetization Data, Christian Binek

Christian Binek Publications

The isothermal magnetization m(H) of the metamagnet FeCl2 is measured in axial magnetic fields 0≤µ0Ha≤12 T at temperatures 34≤T≤53 K above the Néel temperature, where the system is essentially a two-dimensional Ising ferromagnet. The analysis of the data indicates experimental accessibility of the critical exponent µ of the Yang-Lee edge singularities. They manifest themselves in divergences of the density functions g(θ), which quantify the distribution of the zeros of the partition function on the Lee-Yang unit circle in the complex plane. In accordance with the hypothesis of universality, a critical exponent close to the theoretical prediction for the two-dimensional Ising …

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Hyper-Polynomial Hierarchies And The Polynomial Jump, Stephen Fenner, Steven Homer, Randall J. Pruim, Marcus Schaefer Aug 2001

Hyper-Polynomial Hierarchies And The Polynomial Jump, Stephen Fenner, Steven Homer, Randall J. Pruim, Marcus Schaefer

University Faculty Publications and Creative Works

Assuming that the polynomial hierarchy (PH) does not collapse, we show the existence of ascending sequences of ptime Turing degrees of length ω1/CK in PSPACE such that successors are polynomial jumps of their predecessors. Moreover these ptime degrees are all uniformly hard for PH. This is analogous to the hyperarithmetic hierarchy, which is defined similarly but with the (computable) Turing degrees. The lack of uniform least upper bounds for ascending sequences of ptime degrees causes the limit levels of our hyper-polynomial hierarchy to be inherently non-canonical. This problem is investigated in depth, and various possible structures for hyper-polynomial hierarchies are …

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Heavy‐Element Diffusion In Metal‐Poor Stars, Brian Chaboyer, W. H. Fenton, Jenica E. Nelan, D. J. Patnaude, Francesca E. Simon Aug 2001

Heavy‐Element Diffusion In Metal‐Poor Stars, Brian Chaboyer, W. H. Fenton, Jenica E. Nelan, D. J. Patnaude, Francesca E. Simon

Dartmouth Scholarship

Stellar evolution models that include the effect of helium and heavy-element diffusion have been calculated for initial iron abundances of [Fe/H] = -2.3, -2.1, -1.9, and -1.7. These models were calculated for a large variety of masses and three separate mixing lengths, α = 1.50, 1.75, and 2.00 (with α = 1.75 being the solar calibrated mixing length). The change in the surface iron abundance for stars of different masses was determined for the ages of 11, 13, and 15 Gyr. Iron settles out of the surface convection zone on the main sequence ; this iron is dredged back up …

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Electronic Commerce Application Development: A Comparison Of User And It Professional Perspectives, Douglas Havelka, Deepak Khazanchi Aug 2001

Electronic Commerce Application Development: A Comparison Of User And It Professional Perspectives, Douglas Havelka, Deepak Khazanchi

Information Systems and Quantitative Analysis Faculty Proceedings & Presentations

Based on the theory of reasoned action and previous research identifying differences in beliefs between IS specialists and IS users, this paper outlines a proposed study to investigate differences/similarities in beliefs of users and developers in the context of electronic commerce application development projects. The authors are currently in the process of collecting data to address research question posed in this proposal.

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Movement Of Rainbow And Brown Trout In Relation To Water Quality And Food Availability In Lake Ogallala, Nebraska, Corey M. Huxoll Aug 2001

Movement Of Rainbow And Brown Trout In Relation To Water Quality And Food Availability In Lake Ogallala, Nebraska, Corey M. Huxoll

School of Natural Resources: Dissertations, Theses, and Student Research

No abstract provided.

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Water Current, Volume 33, No. 4. August 2001 Aug 2001

Water Current, Volume 33, No. 4. August 2001

Water Current Newsletter

• About 50 Attend June’s Summer Tour of Urban Water and Natural Resources Challenge by Steve Ress

• From the Director

• Meet the Faculty

• Inventorying Nebraska’s Irrigation Acres

• Taking a Look at TMDLs in Nebraska by Patrick O’Brien

• Water News Briefs

• Water Quality Funding Measure Passes by Roy Frederick

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Reversible Melting And Crystallization Of Short And Long Flexible Chain Molecules By Temperature-Modulated Calorimetry, Jeongihm Pak Aug 2001

Reversible Melting And Crystallization Of Short And Long Flexible Chain Molecules By Temperature-Modulated Calorimetry, Jeongihm Pak

Doctoral Dissertations

Melting and crystallization of linear, flexible molecules of different lengths was studied by temperature-modulated differential scanning calorimetry, TMDSC. Various techniques for TMDSC with single and multifrequency modulations have been analyzed to optimize the conditions for the present study. The finally chosen method involved a quasi-isothermal mode with a temperature amplitude of 0.5 K and a period of 60 s (frequency = 0.167 Hz). The interpretation of the reversible and irreversible melting was developed by comparison of a variety of different modes of analysis (sinusoidal, sawtooth, and complex sawtooth). The analyzed molecules ranged from n-paraffins, oligomeric fractions of polyethylene and poly(oxyethylene) …

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Plan Management For The Cottesloe Reef Fish Habitat Protection Area., Fisheries Western Australia Aug 2001

Plan Management For The Cottesloe Reef Fish Habitat Protection Area., Fisheries Western Australia

Fisheries management papers

This document is the final Plan of Management for the Cottesloe Reef FHPA. The significant contribution made by the CMPG and members of the community in the preparation of this plan is acknowledged and appreciated by the Department of Fisheries. The overall objective of the Plan of Management is to promote and encourage protection of the Cottesloe Reef aquatic habitat and involve the community in its management. It is anticipated that the establishment of the Cottesloe Reef FHPA will provide a framework, through regulations and education, to manage human activities that have, or may have, a destructive impact on the …

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A Five Year Management Strategy For Recreational Fishing In The Gascoyne Region Of Western Australia. Final Report Of The Gascoyne Recreational Fishing Working Group., Gascoyne Recreational Fishing Working Group. Aug 2001

A Five Year Management Strategy For Recreational Fishing In The Gascoyne Region Of Western Australia. Final Report Of The Gascoyne Recreational Fishing Working Group., Gascoyne Recreational Fishing Working Group.

Fisheries management papers

The recommendations contained within this paper were reached after careful consideration of the public submissions provided in response to the working group’s discussion paper A Quality Future for Recreational Fishing in the Gascoyne (Fisheries Management Paper 124). The working group would like to thank everyone who forwarded submissions on the discussion paper and attended public meetings to provide input. The wide variety of comments and views expressed reflect the diverse nature of the recreational fishing sector. I believe this range of views was also well represented by the various members of the working group.

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Puerto Rican Karst - A Vital Resource, Ariel E. Lugo, Leopoldo Miranda Castro, Abel Vale, Tania Del Mar López, Enrique Hernández Prieto, Andrés García Martinó, Alberto R. Puente Rolón, Adrianne G. Tossas, Donald A. Mcfarlane, Tom Miller, Armando Rodríguez, Joyce Lundberg, John Thomlinson, José Colón, Johannes H. Schellekens, Olga Ramos, Eileen Helmer Aug 2001

Puerto Rican Karst - A Vital Resource, Ariel E. Lugo, Leopoldo Miranda Castro, Abel Vale, Tania Del Mar López, Enrique Hernández Prieto, Andrés García Martinó, Alberto R. Puente Rolón, Adrianne G. Tossas, Donald A. Mcfarlane, Tom Miller, Armando Rodríguez, Joyce Lundberg, John Thomlinson, José Colón, Johannes H. Schellekens, Olga Ramos, Eileen Helmer

WM Keck Science Faculty Papers

The limestone region of Puerto Rico covers about 27.5 percent of the island's surface and is subdivided into the northern, southern, and dispersed limestone areas. All limestone areas have karst features. The karst belt is that part of the northern limestone with the most spectacular surficial karst landforms. It covers 142,544 ha or 65 percent of the northern limestone. The karst belt is the focus of this publication, although reference is made to all limestone regions. The northern limestone contains Puerto Rico's most extensive freshwater aquifer, largest continuous expanse of mature forest, and largest coastal wetland, estuary, and underground cave …

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Nuclear Magnetic Resonance And Humanistic Mathematics: A Farewell, Linley Erin Hall Aug 2001

Nuclear Magnetic Resonance And Humanistic Mathematics: A Farewell, Linley Erin Hall

Humanistic Mathematics Network Journal

No abstract provided.

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"Stairway To Seven", Lawrence Mark Lesser Aug 2001

"Stairway To Seven", Lawrence Mark Lesser

Humanistic Mathematics Network Journal

No abstract provided.

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On The Preparation Of High School Mathematics Teachers, Edna Maura Zuffi Aug 2001

On The Preparation Of High School Mathematics Teachers, Edna Maura Zuffi

Humanistic Mathematics Network Journal

In this paper I discuss some results got in 1997/98 with Brazilian mathematics school teachers. The research was done to investigate their mathematical language as related to the concept of function. A dichotomy was detected between “formal” and “practical” language they used to express their own conceptions of function, as well as to teach their students this subject. Also, I found teachers’ conceptual images “shrinking” as soon as they were far from their colleges or universities programs.

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To Myself, Abba Kovner Aug 2001

To Myself, Abba Kovner

Humanistic Mathematics Network Journal

No abstract provided.

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Fivefolded Asymmetrical Hand: A Poetic Essay, S. Robert Wilson Aug 2001

Fivefolded Asymmetrical Hand: A Poetic Essay, S. Robert Wilson

Humanistic Mathematics Network Journal

No abstract provided.

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Galactic Hippodrome, Arnold L. Trindade Aug 2001

Galactic Hippodrome, Arnold L. Trindade

Humanistic Mathematics Network Journal

No abstract provided.

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The Natural Role Of Mathematics In The Sciences: How Maharishi's Vedic Science Answers The Question Of The Unreasonable Effectiveness Of Mathematics In The Sciences, Catherine A. Gorini Aug 2001

The Natural Role Of Mathematics In The Sciences: How Maharishi's Vedic Science Answers The Question Of The Unreasonable Effectiveness Of Mathematics In The Sciences, Catherine A. Gorini

Humanistic Mathematics Network Journal

Mathematicians and scientists have for a long time tried to understand why mathematics, a subjective creation of the human intellect, is so effective in the sciences, which study the objective, physical world. Satisfactory reasons have not been found because there has not been a comprehensive understanding of the relationship between the subjective and the objective aspects of life. In this paper we will see that Maharishi’s Vedic Science, by explaining the link between the subjective realm where mathematics is located and the objective world that science examines, can resolve this problem in a natural way.

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Using Guided Inquiry In Teaching Mathematical Subjects, Stephanos Gialamas, Abour Cherif, Sarah Keller, Ann Hansen Aug 2001

Using Guided Inquiry In Teaching Mathematical Subjects, Stephanos Gialamas, Abour Cherif, Sarah Keller, Ann Hansen

Humanistic Mathematics Network Journal

No abstract provided.

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What Does It Mean To Understand Mathematics?, Emam Hoosain Aug 2001

What Does It Mean To Understand Mathematics?, Emam Hoosain

Humanistic Mathematics Network Journal

No abstract provided.

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The Pythagorean Theorem And Area: Postulates Into Theorems, Paul A. Kennedy, Kenneth Evans Aug 2001

The Pythagorean Theorem And Area: Postulates Into Theorems, Paul A. Kennedy, Kenneth Evans

Humanistic Mathematics Network Journal

No abstract provided.

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A Hypnotist Teaches Math: The Effect Of Person Centered Math Support Classes On At-Risk Community College Students, Ron Bell Aug 2001

A Hypnotist Teaches Math: The Effect Of Person Centered Math Support Classes On At-Risk Community College Students, Ron Bell

Humanistic Mathematics Network Journal

The same elements which make Ericksonian hypnosis a highly effective therapeutic tool are found to be at work in an algebra support class called Math Success Orientation. Interpersonal dynamics of Carl Rogers’ person centered approach to counseling are also part of the philosophy of the class which has a four semester track record of improving both grades and attitude in at risk, math avoidant community college students. The article relates the history of the course with illustrations of how the elements of Person Centered Mathematics operate in the classroom. An appendix demonstrates the effect of the class on student grades

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Mathematics And Cultural Diversity In The Curriculum, Rick Gillman Aug 2001

Mathematics And Cultural Diversity In The Curriculum, Rick Gillman

Humanistic Mathematics Network Journal

No abstract provided.

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A Sabbatical Experience: Nurturing A Partnership, R. Michael Krach Aug 2001

A Sabbatical Experience: Nurturing A Partnership, R. Michael Krach

Humanistic Mathematics Network Journal

No abstract provided.

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