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University of Massachusetts Amherst

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2004

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Articles 1 - 30 of 112

Full-Text Articles in Physical Sciences and Mathematics

Evidence For Correlated Titanium And Deuterium Depletion In The Galactic Ism, Jason X. Prochaska, Todd M. Tripp, Christopher Howk Dec 2004

Evidence For Correlated Titanium And Deuterium Depletion In The Galactic Ism, Jason X. Prochaska, Todd M. Tripp, Christopher Howk

Astronomy Department Faculty Publication Series

Current measurements indicate that the deuterium abundance in diffuse interstellar gas varies spatially by a factor of ~4 among sightlines extending beyond the Local Bubble. One plausible explanation for the scatter is the variable depletion of D onto dust grains. To test this scenario, we have obtained high signal-to-noise, high resolution profiles of the refractory ion Ti II along seven Galactic sightlines with D/H ranging from 0.65 to 2.1 × 10−5. These measurements, acquired with the recently upgraded Keck/HIRES spectrometer, indicate a correlation between Ti/H and D/H at the > 95% c.l. Therefore, our observations support the interpretation that D/H scatter …

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My Life With Polymer Science: Scientific And Personal Memoirs, Otto Vogl Dec 2004

My Life With Polymer Science: Scientific And Personal Memoirs, Otto Vogl

Emeritus Faculty Author Gallery

My "life story" will begin with my formative years, my childhood and student days at the University of Vienna, including my dissertation. It will be followed by my teaching appointment as an Instructor at the II. Chemical Institute of the University of Vienna. The urge to see other lands, learn other languages and scientific methods led to the Wandering Years that brought me to the United States. After three years spent as a Research Associate at the University of Michigan and at Princeton University I spent more than 13 years in an industrial career at the Du Pont Company in …

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Pictures From My Life With Polymer Science: Album 1, Otto Vogl Nov 2004

Pictures From My Life With Polymer Science: Album 1, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.

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Pictures From My Life With Polymer Science: Album 2, Otto Vogl Oct 2004

Pictures From My Life With Polymer Science: Album 2, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.

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Pictures From My Life With Polymer Science: Album 3, Otto Vogl Sep 2004

Pictures From My Life With Polymer Science: Album 3, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.

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Sign Detection In Natural Images With Conditional Random Fields, Jerod Weinman Sep 2004

Sign Detection In Natural Images With Conditional Random Fields, Jerod Weinman

Computer Science Department Faculty Publication Series

Traditional generative Markov random fields for segmenting images model the image data and corresponding labels jointly, which requires extensive independence assumptions for tractability. We present the conditional random field for an application in sign detection, using typical scale and orientation selective texture filters and a nonlinear texture operator based on the grating cell. The resulting model captures dependencies between neighboring image region labels in a data-dependent way that escapes the difficult problem of modeling image formation, instead focusing effort and computation on the labeling task. We compare the results of training the model with pseudo-likelihood against an approximation of the …

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Parallel Dynamics And Computational Complexity Of Network Growth Models, Benjamin Machta, Jonathan Machta Aug 2004

Parallel Dynamics And Computational Complexity Of Network Growth Models, Benjamin Machta, Jonathan Machta

Physics Department Faculty Publication Series

No abstract provided.

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Pictures From My Life With Polymer Science: Album 4, Otto Vogl Aug 2004

Pictures From My Life With Polymer Science: Album 4, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.

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Pictures From My Life With Polymer Science: Album 5, Otto Vogl Jul 2004

Pictures From My Life With Polymer Science: Album 5, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.

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Pictures From My Life With Polymer Science: Album 6, Otto Vogl Jun 2004

Pictures From My Life With Polymer Science: Album 6, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.

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Pictures From My Life With Polymer Science: Album 7, Otto Vogl May 2004

Pictures From My Life With Polymer Science: Album 7, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.

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Pictures From My Life With Polymer Science: Album 8, Otto Vogl Apr 2004

Pictures From My Life With Polymer Science: Album 8, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.

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Pictures From My Life With Polymer Science: Album 9, Otto Vogl Mar 2004

Pictures From My Life With Polymer Science: Album 9, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.

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Is Necessity The Mother Of Innovation? The Adoption And Use Of Web Technologies Among Congressional Offices, Kevin M. Esterling, David M.J. Lazer, Michael Neblo Feb 2004

Is Necessity The Mother Of Innovation? The Adoption And Use Of Web Technologies Among Congressional Offices, Kevin M. Esterling, David M.J. Lazer, Michael Neblo

National Center for Digital Government

From first paragraph: Communication between legislator and constituents is fundamental to effective democratic representation, and devising the institutional means for citizen/legislator communication stands as one of the core and persistent problems in the practice of democracy. A legislator needs information about the preferences, ideals, norms, and beliefs of her constituents in order to do her job well. Similarly, citizens need information about the actions and decisions of their representative in order to maintain appropriate accountability. But as national problems become more complex, and as the political process grows more and more dominated by experts and organized groups, it is becoming …

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Pictures From My Life With Polymer Science: Album 10, Otto Vogl Feb 2004

Pictures From My Life With Polymer Science: Album 10, Otto Vogl

Emeritus Faculty Author Gallery

No abstract provided.

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An Introduction To The Thermodynamic And Macrostate Levels Of Nonequivalent Ensembles, H Touchette, Rs Ellis, B Turkington Jan 2004

An Introduction To The Thermodynamic And Macrostate Levels Of Nonequivalent Ensembles, H Touchette, Rs Ellis, B Turkington

Mathematics and Statistics Department Faculty Publication Series

This short paper presents a nontechnical introduction to the problem of nonequivalent microcanonical and canonical ensembles. Both the thermodynamic and the macrostate levels of definition of nonequivalent ensembles are introduced. The many relationships that exist between these two levels are also explained in simple physical terms.

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Thermodynamic Versus Statistical Nonequivalence Of Ensembles For The Mean-Field Blume-Emery-Griffiths Model, Rs Ellis, H Touchette, B Turkington Jan 2004

Thermodynamic Versus Statistical Nonequivalence Of Ensembles For The Mean-Field Blume-Emery-Griffiths Model, Rs Ellis, H Touchette, B Turkington

Mathematics and Statistics Department Faculty Publication Series

We illustrate a novel characterization of nonequivalent statistical mechanical ensembles using the mean-field Blume–Emery–Griffiths (BEG) model as a test model. The novel characterization takes effect at the level of the microcanonical and canonical equilibrium distributions of states. For this reason it may be viewed as a statistical characterization of nonequivalent ensembles which extends and complements the common thermodynamic characterization of nonequivalent ensembles based on nonconcave anomalies of the microcanonical entropy. By computing numerically both the microcanonical and canonical sets of equilibrium distributions of states of the BEG model, we show that for values of the mean energy where the microcanonical …

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Rich Example Of Geometrically Induced Nonlinearity: From Rotobreathers And Kinks To Moving Localized Modes And Resonant Energy Transfer, Pg Kevrekidis, Et. Al Jan 2004

Rich Example Of Geometrically Induced Nonlinearity: From Rotobreathers And Kinks To Moving Localized Modes And Resonant Energy Transfer, Pg Kevrekidis, Et. Al

Mathematics and Statistics Department Faculty Publication Series

We present an experimentally realizable, simple mechanical system with linear interactions whose geometric nature leads to nontrivial, nonlinear dynamical equations. The equations of motion are derived and their ground state structures are analyzed. Selective “static” features of the model are examined in the context of nonlinear waves including rotobreathers and kinklike solitary waves. We also explore “dynamic” features of the model concerning the resonant transfer of energy and the role of moving intrinsic localized modes in the process.

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8th Bratislava International Conference On Modified Polymers: Modpol2003, Otto Vogl, Maria Omastova Jan 2004

8th Bratislava International Conference On Modified Polymers: Modpol2003, Otto Vogl, Maria Omastova

Emeritus Faculty Author Gallery

No abstract provided.

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A. Cover Page, Title Page, Table Of Contents, And Forward, Otto Vogl Jan 2004

A. Cover Page, Title Page, Table Of Contents, And Forward, Otto Vogl

Emeritus Faculty Author Gallery

The History of the Pacific Polymer Federation (PPF) describes the background and pursuit that was needed to create the PPF and bring it to a functioning organization. It includes a general description, as well as edited Pacific Polymer Newsletters and articles that have been written in Polymer News describing additional PPF activities and the Pacific Polymer Conferences.

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B. The Signing Of The Constitution Of The Pacific Polymer Federation, Otto Vogl Jan 2004

B. The Signing Of The Constitution Of The Pacific Polymer Federation, Otto Vogl

Emeritus Faculty Author Gallery

The Constitution of the Pacific Polymer Federation was signed on October 19, 1987 in Tokyo, Japan at the Inter-national House in Roppongi, Tokyo by the Chairman of the ACS Division of Polymer Chemistry, S, R. Eby, and the Chair-man of the Foreign Affairs Committee, O. Vogl; by the President of the Society of Polymer Science Japan, M. Takayanagi; Chairman and Vice President for International Affairs, A. Abe. For the Polymer Division of the Royal Aus-tralian Institute of Chemistry, Chairman D.J.T. Hill and Chair-man of the International Committee, J.H. O'Donnell signed the Constitution.

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C. Pacific Polymer Federation Presidents, Otto Vogl Jan 2004

C. Pacific Polymer Federation Presidents, Otto Vogl

Emeritus Faculty Author Gallery

Names and photographs of the presidents of the Pacific Polymer Federation.

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E. President Of The Pacific Polymer Federation, Otto Vogl Jan 2004

E. President Of The Pacific Polymer Federation, Otto Vogl

Emeritus Faculty Author Gallery

A history of the first president of the Pacific Polymer Federation.

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D. Founding Of The Pacific Polymer Federation, Otto Vogl Jan 2004

D. Founding Of The Pacific Polymer Federation, Otto Vogl

Emeritus Faculty Author Gallery

An account of the process which led to the founding of the Pacific Polymer Federation and a copy of the Constitution of the Pacific Polymer Federation.

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F. Growth Of The Pacific Polymer Federation, Otto Vogl Jan 2004

F. Growth Of The Pacific Polymer Federation, Otto Vogl

Emeritus Faculty Author Gallery

Describes the growth and development of the Pacific Polymer Federation,

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G. Excerpts Of Pacific Polymer Federation Newsletters, Otto Vogl Jan 2004

G. Excerpts Of Pacific Polymer Federation Newsletters, Otto Vogl

Emeritus Faculty Author Gallery

Excerpts of Pacific Polymer Federation Newsletters 1-13, 1989-2003. Covers the presidencies of Otto Vogl, Takeo Saegusa, Joseph Salamone, Chung Yup Kim, Fosong Wang, Takeshi Ogawa, and Supawan Tantayanon.

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H. Pacific Polymer Federation Conference Reports, Otto Vogl Jan 2004

H. Pacific Polymer Federation Conference Reports, Otto Vogl

Emeritus Faculty Author Gallery

Reports of the first through the sixth Pacific Polymer Federation Conferences, held biennially 1989-1999. Also includes reporting on the Pacific Polymer Federation.

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Department Of Physics Newsletter: Spring 2004, Bob Krotkov, Gerry Peterson, Monroe Rabin, Hajime Sakai Jan 2004

Department Of Physics Newsletter: Spring 2004, Bob Krotkov, Gerry Peterson, Monroe Rabin, Hajime Sakai

Physics Newsletters

No abstract provided.

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Long Distance Chiral Corrections In Beta Meson Amplitudes, Jj Sanz-Cillero, Jf Donoghue, A Ross Jan 2004

Long Distance Chiral Corrections In Beta Meson Amplitudes, Jj Sanz-Cillero, Jf Donoghue, A Ross

Physics Department Faculty Publication Series

We discuss the chiral corrections to fB and BB with particular emphasis on determining the portion of the correction that arises from long distance physics. For very small pion and kaon masses all of the usual corrections are truly long distance, while for larger masses the long distance portion decreases. These chiral corrections have been used to extrapolate lattice calculations towards the physical region of lighter masses. We show in particular that the chiral extrapolation is better behaved if only the long distance portion of the correction is used. We also display the long distance portions of the infrared enhanced …

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Weather And Climate, Rob Snyder Jan 2004

Weather And Climate, Rob Snyder

Science and Engineering Saturday Seminars

No abstract provided.

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