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Book I, Otto Vogl: Papers And Patents, 1948-1970, Jane C. Vogl

Emeritus Faculty Author Gallery

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Centers Of Polymer Science: Introduction, Otto Vogl

Emeritus Faculty Author Gallery

Centers of Polymer Science describes polymer research activities taking place in Europe, Asia, and Australia primarily during the years between 1980 and 2000. This series of articles shows and records the activity in Polymer Science in this part of polymer history.

E-Government And Inter-Organizational Collaboration In Mexico: Survey Results, Luis F. Luna-Reyes, J. Ramon Gil-Garcia

National Center for Digital Government

From executive summary: This document summarizes the responses to questionnaires completed by participants from inter-organizational information technology (IT) projects in the Mexican federal government. The questionnaire was undertaken as part of a research project on e-government and inter-organizational collaboration funded by the National Council of Science and Technology (CONACYT) and conducted jointly by researchers from the Business School of the Universidad de las Américas in Puebla, México, the Centro de Investigación y Docencia Económicas in Mexico City, and the National Center for Digital Government at the University of Massachusetts in Amherst. The responses reflect the opinions of 282 government officials …

Open Source Software Collaboration: Foundational Concepts And An Empirical Analysis, Charles M. Schweik, Robert English, Sandra Haire

National Center for Digital Government

This paper has three primary goals. First, we provide an overview on some foundational concepts – “peer-production,” “user-centric innovation,” “crowdsourcing,” “task granularity,” and yes, open source and open content – for they are key elements of Internet-based collaboration we see today. Second, through this discussion on foundational concepts, we hope to make it clear why people interested in collaborative public management and administration should care about open source and open source-like collaboration. After this argument is made, we provide a very condensed summary of where we are to date on open source collaboration research. The goal of that research is …

Book Ii, Otto Vogl: Papers And Patents, 1970-1977, Jane C. Vogl

Emeritus Faculty Author Gallery

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Book Iii, Otto Vogl: Publications, 1977-1979, Jane C. Vogl

Emeritus Faculty Author Gallery

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Semiinfiniate Flags. Ii. Local And Global Intersection Cohomology Of Quasimaps' Spaces, Boris Feigin, Michael Finkelberg, Alexander Kuznetsov, Ivan Mirkoviæ

Mathematics and Statistics Department Faculty Publication Series

No abstract provided.

Book Iv, Otto Vogl: Publications, 1979-1981, Jane C. Vogl

Emeritus Faculty Author Gallery

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Book V, Otto Vogl: Publications, 1981-1984, Jane C. Vogl

Emeritus Faculty Author Gallery

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Autonomous Geometric Precision Error Estimation In Low-Level Computer Vision Tasks, Andrés Corrada-Emmanuel, Howard Schultz

Computer Science Department Faculty Publication Series

Errors in map-making tasks using computer vision are sparse. We demonstrate this by considering the construction of digital elevation models that employ stereo matching algorithms to triangulate real-world points. This sparsity, coupled with a geometric theory of errors recently developed by the authors, allows for autonomous agents to calculate their own precision independently of ground truth. We connect these developments with recent advances in the mathematics of sparse signal reconstruction or compressed sensing. The theory presented here extends the autonomy of 3-D model reconstructions discovered in the 1990s to their errors.

Book Vi, Otto Vogl: Publications, 1984-1986, Jane C. Vogl

Emeritus Faculty Author Gallery

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Book Vii, Otto Vogl: Publications, 1987-1989, Jane C. Vogl

Emeritus Faculty Author Gallery

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Book Viii, Otto Vogl: Publications, 1989-1992, Jane C. Vogl

Emeritus Faculty Author Gallery

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Development And Assessment Of Role-Play Scenarios For Teaching Rcr, Michael C. Loui, Bradley J. Brummel, C. K. Gunsalus, Kerri L. Kristich

Ethics in Science and Engineering National Clearinghouse

No abstract provided.

Book Ix, Otto Vogl: Publications, 1993-1995, Jane C. Vogl

Emeritus Faculty Author Gallery

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

The New Middle-Class, Technology And Modernity In Seelampur, Sreela Sarkar

National Center for Digital Government

From introduction: My paper studies a globally acclaimed experiment in computer literacy and cultural capital in Seelampur, located on the Delhi-Uttar Pradesh state border. In late 2003, Datamation, a prominent private, Delhi based Information Technology firm, with partial funding from UNESCO and the Delhi state government, established computer literacy and e-commerce development projects in Zaffarabad in Seelampur. Seelampur is a diverse community but like the rest of the area, Zaffarabad is largely a settlement of informal working class Muslims. State violence and dominant middle-class interests have historically colluded to create Seelampur. During the National Emergency years in 1975-1977, residents of …

Book X, Otto Vogl: Publications, 1996-1998, Jane C. Vogl

Emeritus Faculty Author Gallery

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Data Management And Whistle-Blowing, Michael C. Loui

Ethics in Science and Engineering National Clearinghouse

No abstract provided.

Globular Cluster Evolution In M87 And Fundamental Plane Ellipticals, Chigurupati Murali, Martin D. Weinberg

Astronomy Department Faculty Publication Series

The globular cluster population in M87 has decreased measurably through dynamical evolution caused by relaxation, binary heating and time-dependent tidal perturbation. For fundamental plane ellipticals in general, cluster populations evolve more rapidly in smaller galaxies because of the higher mass density. A simple evolutionary model reproduces the observed trend in specific frequency with luminosity for an initially constant relationship. Fits of theoretically evolved populations to M87 cluster data from McLaughlin et al. (1994) show the following: 1) dynamical effects drive evolution in the initial mass and space distributions and can account for the large core in the spatial profile as …

Book Xi, Otto Vogl: Publications, 1999-2000, Jane C. Vogl

Emeritus Faculty Author Gallery

Books I-XII include citations to Otto Vogl's publications and patents. Printed versions of these twelve volumes are also available in the Integrated Sciences and Engineering Library of the University of Massachusetts in Amherst. MA, Lederle Graduate Research Center. The printed volumes include the full reprints of all cited publications.

Who Was Who In Polymer Science: Faculty Of The Polymer Science & Engineering Department At The University Of Massachusetts Amherst, Otto Vogl

Emeritus Faculty Author Gallery

Richards S. Stein

Otto Vogl

Robert W. Lenz

MacKnight, William

Karasz, Frank. E.

Farris, Richard

MacCarthy, Thomas

Hsu, Shaw Lin

Evolution Of The Mass Function Of The Galactic Globular Cluster System, E. Vesperini

Astronomy Department Faculty Publication Series

We investigate the evolution of the mass function of the Galactic globular cluster system (GCMF) taking into account the effects of stellar evolution, two-body relaxation, disk shocking and dynamical friction on the evolution of individual globular clusters.We have adopted a log-normal initial GCMF and we have studied in detail the dependence on the initial dispersion and mean value of the GCMF of the fraction of the initial number of clusters surviving after one Hubble time, of the final GCMF, and of the difference between the properties of the GCMF of clusters closer to the Galactic center and of those in …

Effect Of The Milkyway On Magellanic Cloud Structure, Martin D. Weinberg

Astronomy Department Faculty Publication Series

A combination of analytic models and n-body simulations implies that the structural evolution of the Large Magellanic Cloud (LMC) is dominated by its dynamical interaction with the Milky Way. Although expected at some level, the scope of the involvement has significant observational consequences. First, LMC disk orbits are torqued out of the disk plane, thickening the disk and populating a spheroid. The torque results from direct forcing by the Milky Way tide and, indirectly, from the drag between the LMC disk and its halo resulting from the induced precession of the LMC disk. The latter is a newly reported mechanism …

The Effect Of The Galactic Spheroid On Globular Cluster Evolution, Chigurupati Murali, Martin D. Weinberg

Astronomy Department Faculty Publication Series

We study the combined effects of relaxation, tidal heating and binary heating on globular cluster evolution, exploring the physical consequences of external effects and examining evolutionary trends in the MilkyWay population. Our analysis demonstrates that heating on circular and low-eccentricity orbits can dominate cluster evolution. The results also predict rapid evolution on eccentric orbits either due to strong relaxation caused by the high densities needed for tidal limitation or due to efficient bulge shocking of low density clusters. The combination of effects leads to strong evolution of the population as a whole. For example, within the solar circle, tidally-limited 105M⊙ …

The 2mass Color-Magnitude Diagram Of The Center Of The Sagittarius Dwarf Galaxy: Photometric Measurements Of A Surprisingly High Mean Metallicity, Andrew A. Cole

Astronomy Department Faculty Publication Series

We present the Two Micron All Sky Survey (2MASS) (J−K, K) color-magnitude diagram for the region within 1◦ of the center of the Sagittarius dwarf spheroidal galaxy. Using the slope of the red giant branch (RGB), we determine a mean metallicity for the main stellar population of [Fe/H] = −0.5 ±0.2. The Sagittarius RGB possesses a blue tail that overlaps with the foreground Milky Way giant branch, and suggests that ∼ 1/3 of the RGB is more metal-poor than [Fe/H] ~−1. Direct comparison to the Large Magellanic Cloud confirms the metal-rich nature of the bulk of the Sagittarius population. Our …

Pre-Peak Ram Pressure Stripping In The Virgo Cluster Spiral Galaxy Ngc 4501, B. Vollmer, M. Soida, A. Chung, J. H. Van Gorkom, K. Otmianowska-Mazur, R. Beck, M. Urbanik, J.D. P. Kenney

Astronomy Department Faculty Publication Series

VIVA HI observations of the Virgo spiral galaxy NGC 4501 are presented. The HI disk is sharply truncated to the southwest, well within the stellar disk. A region of low surface-density gas, which is more extended than the main HI disk, is discovered northeast of the galaxy center. These data are compared to existing 6 cm polarized radio continuum emission, Hα, and optical broad band images. We observe a coincidence between the western HI and polarized emission edges, on the one hand, and a faint Hα emission ridge, on the other. The polarized emission maxima are located within the gaps …

Autonomous Estimates Of Horizontal Decorrelation Lengths For Digital Elevation Models, Andres Corrada-Emmanuel, Howard Schultz

Computer Science Department Faculty Publication Series

The precision errors in a collection of digital elevation models (DEMs) can be estimated in the presence of large but sparse correlations even when no ground truth is known. We demonstrate this by considering the problem of how to estimate the horizontal decorrelation length of DEMs produced by an automatic photogrammetric process that relies on the epipolar constraint equations. The procedure is based on a set of autonomous elevation difference equations recently proposed by us. In this paper we show that these equations can only estimate the precision errors of DEMs. The accuracy errors are unknowable since there is no …

Local Torsion On Elliptic Curves And The Deformation Theory Of Galois Representations, C David, T Weston

Mathematics and Statistics Department Faculty Publication Series

No abstract provided.

Dipole And Quadrupole Solitons In Optically-Induced Two-Dimensional Defocusing Photonic Lattices, H Susanto, Kjh Law, Pg Kevrekidis, L Tang, C Lou, X Wang, Z Chen

Mathematics and Statistics Department Faculty Publication Series

We demonstrate a possibility to generate localized states in effectively one-dimensional Bose-Einstein condensates with a negative scattering length in the form of a dark soliton in the presence of an optical lattice (OL) and/or a parabolic magnetic trap. We connect such structures with twisted localized modes (TLMs) that were previously found in the discrete nonlinear Schrödinger equation. Families of these structures are found as functions of the OL strength, tightness of the magnetic trap and chemical potential, and their stability regions are identified. Stable bound states of two TLMs are also found. In the case when the TLMs are unstable, …

Dark Solitons In External Potentials, De Pelinovsky, Pg Kevrekidis

Mathematics and Statistics Department Faculty Publication Series

We consider the persistence and stability of dark solitons in the Gross–Pitaevskii (GP) equation with a small decaying potential. We show that families of black solitons with zero speed originate from extremal points of an appropriately defined effective potential and persist for sufficiently small strength of the potential. We prove that families at the maximum points are generally unstable with exactly one real positive eigenvalue, while families at the minimum points are generally unstable with exactly two complex-conjugated eigenvalues with positive real part. This mechanism of destabilization of the black soliton is confirmed in numerical approximations of eigenvalues of the …