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1999

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Articles 2611 - 2640 of 6179

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Activation Entropy, Activation Energy, And Magnetic Viscosity, Ralph Skomski, Roger D. Kirby, David J. Sellmyer Apr 1999

Activation Entropy, Activation Energy, And Magnetic Viscosity, Ralph Skomski, Roger D. Kirby, David J. Sellmyer

Roger Kirby Publications

Starting from an exact quantum-statistical description, the influence of the shape of the energy landscape on the magnetic viscosity is investigated. Magnetic phase-space analysis based on Kramers’ escape-rate theory of chemical reaction kinetics theory shows that the activation entropy associated with thermally activated hopping modifies the magnetic viscosity by reducing the attempt-frequency prefactor compared to an earlier prediction by Brown [W. F. Brown, Phys. Rev. 130, 1677 (1963)]. Energetic contributions are analyzed in terms of a model applicable to a range of coherent and noncoherent magnetization processes, and in the long-time limit deviations from the linear logarithmic magnetic-viscosity law are …

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Dielectric Tensor For Magneto-Optic Nimnsb, Xiang Gao, John A. Woollam, Roger D. Kirby, David J. Sellmyer, C. T. Tanaka, J. Nowak, Jagadeesh S. Moodera Apr 1999

Dielectric Tensor For Magneto-Optic Nimnsb, Xiang Gao, John A. Woollam, Roger D. Kirby, David J. Sellmyer, C. T. Tanaka, J. Nowak, Jagadeesh S. Moodera

Department of Physics and Astronomy: Faculty Publications

The diagonal component ɛxx and off-diagonal component ɛxy of the complex dielectric tensor for the ferromagnetic compound NiMnSb are determined using ex situ spectroscopic ellipsometry and magneto-optic analysis over the spectral range from 0.7 to 6.2 eV. The effects of the overcoat on the raw data are removed by the analysis. First, the complex ɛxx of thin-film NiMnSb were determined by ex situ spectroscopic ellipsometry; then ɛxy was determined by analyzing Kerr rotation and ellipticity data using the determined ɛxy data. Lorentz oscillators were used to model peaks seen in the ɛxx spectra. The …

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Effects Of Layer Thickness On Orientation Distribution And Magnetic Properties Of Cocrta/Cr Films, Z.S. Shan, H. Zeng, C.X. Zhu, M. Azarisooreh, K. Honardoost Apr 1999

Effects Of Layer Thickness On Orientation Distribution And Magnetic Properties Of Cocrta/Cr Films, Z.S. Shan, H. Zeng, C.X. Zhu, M. Azarisooreh, K. Honardoost

David Sellmyer Publications

Evolution of orientation distribution of Co(110) crystal planes was determined by x-ray rocking curves. It has been found that: (i) The full-width at half maximum W of the Co(110) rocking curve decreases with both increasing Cr underlayer thickness dcr, and increasing CoCrTa magnetic layer thickness dco, especially in the thin layer regime. (ii) For the thin dcoregime, the interlayer diffusion between the Cr underlayer and the magnetic layer affects the rocking curves and magnetic properties significantly. (iii) Film magnetic properties, e.g., a significant jump in coercivity with increasing magnetic layer thickness in the thin …

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Student Scholarship Day 1999, Grand Valley State University Apr 1999

Student Scholarship Day 1999, Grand Valley State University

Student Scholars Day Archives

No abstract provided.

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Cwu Faculty Senate Minutes - 04/14/1999, Marsha Brandt Apr 1999

Cwu Faculty Senate Minutes - 04/14/1999, Marsha Brandt

Faculty Senate Minutes

These are the official Central Washington University Faculty Senate Minutes for the 04/14/1999 regular meeting.

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April 14, 1999 Cal Poly Report, Public Affairs Office Apr 1999

April 14, 1999 Cal Poly Report, Public Affairs Office

Cal Poly Report

No abstract provided.

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The Winonan, Winona State University Apr 1999

The Winonan, Winona State University

The Winonan - 1990s

No abstract provided.

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The Pan American (1999-04-14), Javier J. Mancha Apr 1999

The Pan American (1999-04-14), Javier J. Mancha

UTPA Archives - The Pan American Newspaper

47th Year, No. 60

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Daily Eastern News: April 14, 1999, Eastern Illinois University Apr 1999

Daily Eastern News: April 14, 1999, Eastern Illinois University

April

No abstract provided.

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Minimum Area, The Flux Tube, And Thomas Precession, Ken Williams Apr 1999

Minimum Area, The Flux Tube, And Thomas Precession, Ken Williams

Research, Publications & Creative Work

Quark confinement in Buchmüller’s picture of a rotating flux tube is reconsidered in the context of a minimum area evaluation of the Wilson loop. The question is asked whether the resulting spin independent dynamics is consistent with Thomas precessional spin dependence leading from electric confinement. The answer appears to be in the negative; self-consistency of the picture found in the literature is examined and explained in simple classical terms, with illustrations.

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Matthew Dearing Of Geneseo, Ill. Goldwater Scholarship Awarded To Iwu Physics Major, Bob Aaron Apr 1999

Matthew Dearing Of Geneseo, Ill. Goldwater Scholarship Awarded To Iwu Physics Major, Bob Aaron

News and Events (Discontinued Series)

No abstract provided.

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The Missouri Miner, April 14, 1999 Apr 1999

The Missouri Miner, April 14, 1999

The Missouri Miner Newspaper

No abstract provided.

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Academic Senate - Agenda, 4/13/1999, Academic Senate Apr 1999

Academic Senate - Agenda, 4/13/1999, Academic Senate

Academic Senate Agendas

No abstract provided.

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Otter Realm, April 13, 1999, Vol. 4 No. 12, California State University, Monterey Bay Apr 1999

Otter Realm, April 13, 1999, Vol. 4 No. 12, California State University, Monterey Bay

The Otter Realm

President Smith asked to Resign -- CFA Declares Right to Strike -- A Packed House and a Boisterous Crowd attends the First President's Symposium -- Graduate Almanac: Nikki Sannicolas -- Master's Student Wins New American Fellowship -- Money -- Earth Day Activities and History -- Elusive Shrimp Found Again in Fort Ord Vernal Pools -- Women in Law Enforcement -- Julian Bond Choice For Keynote Speaker -- Beat Era Revisited: Poetry and Acoustic Music at the BBC -- Golf is a Game of Ups and Downs

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Research Conference Iwu's 10th Annual John Wesley Powell Student Research Conference, Sherry Wallace Apr 1999

Research Conference Iwu's 10th Annual John Wesley Powell Student Research Conference, Sherry Wallace

News and Events (Discontinued Series)

No abstract provided.

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Daily Eastern News: April 13, 1999, Eastern Illinois University Apr 1999

Daily Eastern News: April 13, 1999, Eastern Illinois University

April

No abstract provided.

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The Bg News April 13, 1999, Bowling Green State University Apr 1999

The Bg News April 13, 1999, Bowling Green State University

BG News (Student Newspaper)

The BGSU campus student newspaper. April 13, 1999. Volume 82-Issue 133.

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The Pan American (1999-04-13), Javier J. Mancha Apr 1999

The Pan American (1999-04-13), Javier J. Mancha

UTPA Archives - The Pan American Newspaper

47th Year, No. 59

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The Art At The University Of Alaska Anchorage : An Inventory. Part Ii: Donated And Purchased Art, N/A N/A Apr 1999

The Art At The University Of Alaska Anchorage : An Inventory. Part Ii: Donated And Purchased Art, N/A N/A

Documents

An inventory of artworks owned by the University of Alaska Anchorage, done in 1998-1999. Part 1: Donated and purchased art.

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The Parthenon, April 13, 1999, Marshall University Apr 1999

The Parthenon, April 13, 1999, Marshall University

The Parthenon

No abstract provided.

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Monitor Newsletter April 12, 1999, Bowling Green State University Apr 1999

Monitor Newsletter April 12, 1999, Bowling Green State University

Monitor

Official Publication of Bowling Green State University for Faculty and Staff

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The Molecular Ism In Low Surface Brightness Disk Galaxies, J. Christopher Mihos, Stacy S. Mcgaugh Apr 1999

The Molecular Ism In Low Surface Brightness Disk Galaxies, J. Christopher Mihos, Stacy S. Mcgaugh

Faculty Scholarship

We present models for the interstellar medium in disk galaxies. In particular, we investigate whether the ISM in low surface brightness galaxies can support a significant fraction of molecular gas given their low metallicity and surface density. It is found that the abundance and line brightness of CO in LSB galaxies is small and typically below current observational limits. Still, depending on physical details of the ISM, the fraction of gas in the form of molecular hydrogen can be significant in the inner few kilo-parsecs of a low surface brightness galaxy. This molecular gas would be at temperatures of ∼ …

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The Weekly Challenger, April 10, 1999, The Weekly Challenger, Et Al Apr 1999

The Weekly Challenger, April 10, 1999, The Weekly Challenger, Et Al

Weekly Challenger Newspaper Collection

The April 10, 1999, issue of The Weekly Challenger.

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A Reanalysis Of The Ultraviolet Extinction From Interstellar Dust In The Large Magellanic Cloud, K. A. Misselt, Geoffrey C. Clayton, Karl D. Gordon Apr 1999

A Reanalysis Of The Ultraviolet Extinction From Interstellar Dust In The Large Magellanic Cloud, K. A. Misselt, Geoffrey C. Clayton, Karl D. Gordon

Faculty Publications

We have reanalyzed the Large Magellanic Cloud's (LMC) ultraviolet (UV) extinction using data from the IUE final archive. Our new analysis takes advantage of the improved signal-to-noise ratio of the IUE NEWSIPS reduction, the exclusion of stars with very low reddening, the careful selection of well-matched comparison stars, and an analysis of the effects of Galactic foreground dust. Differences between the average extinction curves of the 30 Dor region and the rest of the LMC are reduced compared with previous studies. We find that there is a group of stars with very weak 2175 Å bumps that lie in or …

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Airport Bird Threat In North America From Large Flocking Birds (Geese) (As Viewed By An Engine Manufacturer)--Part 1, Thomas Alge Apr 1999

Airport Bird Threat In North America From Large Flocking Birds (Geese) (As Viewed By An Engine Manufacturer)--Part 1, Thomas Alge

Bird Strike Committee-USA/Canada Joint Annual Meeting: 1st (1999)

In worldwide aviation operations, bird collisions with aircraft and ingestions into engine inlets present safety hazards and financial loss through equipment damage, loss of service and disruption to operations. The problem is encountered by all types of aircraft, both military and commercial. Modern aircraft engines have achieved a high level of reliability while manufacturers and users continually strive to further improve the safety record. A major safety concern today includes common-cause events which involve significant power loss on more than one engine. These are externally-inflicted occurrences, with the most frequent being encounters with flocks of birds. Most frequently these encounters …

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Newscast, April 9, 1999, Illinois State University, College Of Applied Science And Technology Apr 1999

Newscast, April 9, 1999, Illinois State University, College Of Applied Science And Technology

newsCAST

Newsletter of the Illinois State University College of Applied Science and Technology

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Utb-Tsc Academic Senate Minutes 1999-04-09, University Of Texas At Brownsville And Texas Southmost College. Faculty Senate. Apr 1999

Utb-Tsc Academic Senate Minutes 1999-04-09, University Of Texas At Brownsville And Texas Southmost College. Faculty Senate.

UTB/TSC Faculty Senate Minutes

No abstract provided.

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College Voice Vol. 22 No. 18, Connecticut College Apr 1999

College Voice Vol. 22 No. 18, Connecticut College

1998-1999

No abstract provided.

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K-Inflation, Christian Armendariz-Picon, T. Damour, V. Mukhanov Apr 1999

K-Inflation, Christian Armendariz-Picon, T. Damour, V. Mukhanov

Physics - All Scholarship

It is shown that a large class of higher-order (i.e. non-quadratic) scalar kinetic terms can, without the help of potential terms, drive an inflationary evolution starting from rather generic initial conditions. In many models, this kinetically driven inflation (or "k-inflation" for short) rolls slowly from a high-curvature initial phase, down to a low-curvature phase and can exit inflation to end up being radiation-dominated, in a naturally graceful manner. We hope that this novel inflation mechanism might be useful in suggesting new ways of reconciling the string dilaton with inflation

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Daily Eastern News: April 09, 1999, Eastern Illinois University Apr 1999

Daily Eastern News: April 09, 1999, Eastern Illinois University

April

No abstract provided.

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