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The Upper Limit For Ch4 In The Protostellar Disk Toward Hl Tauri, E L. Gibb, T Rettig, Sean D. Brittain, R Haywood, Theodore Simon, C Kulesa Jul 2004

The Upper Limit For Ch4 In The Protostellar Disk Toward Hl Tauri, E L. Gibb, T Rettig, Sean D. Brittain, R Haywood, Theodore Simon, C Kulesa

Publications

We used high-resolution infrared spectra of the heavily embedded T Tauri star HL Tau to search for evidence of absorption due to the R0, R1, and R2 gas-phase CH4 ν3 lines near 3.3 μm. From this, we report a 3 σ upper limit of 1.3 × 1015 cm-2 for the CH4 gas column density toward HL Tau. Our results are compared to those found for CO gas toward this source and to the recent model for chemistry in the inner (10 AU) disks around T Tauri stars by Markwick et al. We find that the upper limit of methane ice+gas …

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Clemson A&M College Class Of 1939 Reunion Program 2004, Clemson University Jun 2004

Clemson A&M College Class Of 1939 Reunion Program 2004, Clemson University

Reunion Programs

No abstract provided.

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Classroom Exercises For Grid Services, Amy Apon, Jens Mache, Yuriko Yara, Kurt Landrus May 2004

Classroom Exercises For Grid Services, Amy Apon, Jens Mache, Yuriko Yara, Kurt Landrus

Presentations

No abstract provided.

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Clemson Commencement Program, May 2004, Clemson University May 2004

Clemson Commencement Program, May 2004, Clemson University

Clemson Commencement Programs

No abstract provided.

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Interstellar H3+ Line Absorption Toward Lkhα 101, Sean D. Brittain, Theodore Simon, Craig Kulesa, Terrence W. Rettig May 2004

Interstellar H3+ Line Absorption Toward Lkhα 101, Sean D. Brittain, Theodore Simon, Craig Kulesa, Terrence W. Rettig

Publications

We present a detection of three lines of the H+3 ion in the near-infrared spectrum of the Herbig Be star LkHalpha 101. H+3 is the principal initiator of gas-phase chemistry in interstellar clouds and can be used to constrain the ionization rate or the path length through interstellar material along the line of sight. Essentially all of the observed H+3 column of (2.2+/-0.3)×1014 cm-2 toward LkHalpha 101 originates in the same dense, dark cloud; less than 1 mag of the ~11 total magnitudes of visual extinction is attributable to diffuse material. Constraints on the density [1×104cm-3

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Structural Geology And Aquifer Characterization Of Glassy Mountain, South Carolina Piedmont, Cameron M. Warlick May 2004

Structural Geology And Aquifer Characterization Of Glassy Mountain, South Carolina Piedmont, Cameron M. Warlick

All Dissertations

Lithologies and structures of the Inner Piedmont geological province were mapped in detail in the vicinity of a major, new residential development on Glassy Mountain, which is located north of Greenville, South Carolina, within the Saluda 7.5-minute quadrangle. Three principal lithostratigraphic units are recognized within the study area: the Henderson Gneiss, Upper Mill Spring unit, and Poor Mountain Formation. The contact between the Henderson Gneiss and the overlying Upper Mill Spring-Poor Mountain sequence is the Seneca Thrust. The contact between the Upper Mill Spring unit and the overlying Poor Mountain Formation is also a thrust fault. Fold vergence and thrust …

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Beryllium Abundances In F And G Dwarfs In Praesepe And Other Young Clusters From Keck Hires Observations, Ann Merchant Boesgaard, Eric Armengaud, Jeremy R. King Apr 2004

Beryllium Abundances In F And G Dwarfs In Praesepe And Other Young Clusters From Keck Hires Observations, Ann Merchant Boesgaard, Eric Armengaud, Jeremy R. King

Publications

The study of both Be and Li gives useful clues about stellar internal structure. Of particular interest is the study of these light elements in open clusters, which have a known age and metallicity. In this paper we present a study of Be abundances in 10 F-type stars in Praesepe and a comprehensive discussion about Be abundances in other open clusters: Hyades, Pleiades, Per, Coma, and UMa. We have made observations of the doublet of Be ii around 3130 A˚ in Praesepe stars, using the Keck I telescope and the High Resolution Echelle Spectrometer (HIRES). Beryllium abundances were derived from …

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Clemson Trustees Minutes, 2004 April 9, Clemson University Board Of Trustees Apr 2004

Clemson Trustees Minutes, 2004 April 9, Clemson University Board Of Trustees

Minutes

Minutes of the Meeting of The Clemson University Board of Trustees. Madren Center Board Room, Clemson SC.

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Oxygen In Open Cluster Dwarfs: Pleiades And M34, Simon C. Schuler, Jeremy R. King, L M. Hobbs, Marc H. Pinsonneault Feb 2004

Oxygen In Open Cluster Dwarfs: Pleiades And M34, Simon C. Schuler, Jeremy R. King, L M. Hobbs, Marc H. Pinsonneault

Publications

We analyze the high-excitation O I lambda7774 triplet in high-resolution, moderate signal-to-noise ratio spectra of 15 Pleiades and eight M34 open cluster dwarfs over the effective temperature range of 5048-6172 K. Relative O abundances have been derived using model atmospheres interpolated from four different sets of ATLAS9 grids. In contrast to existing non-LTE (NLTE) predictions, a dramatic increase in the O I triplet abundance with decreasing temperature is seen for both clusters, regardless of the atmospheric model. S I abundances of three Pleiades stars derived from the high-excitation lambda6053 feature mimic the O I abundance behavior. O abundances have also …

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Clemson Graduate School Catalog, 2004-2005, Clemson University Jan 2004

Clemson Graduate School Catalog, 2004-2005, Clemson University

Clemson Graduate Announcements

No abstract provided.

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President's Report Card To Board Of Trustees, 2004-04, Clemson University Jan 2004

President's Report Card To Board Of Trustees, 2004-04, Clemson University

President's Reports to the Board of Trustees

No abstract provided.

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President's Report Card To Board Of Trustees, 2004-10, Clemson University Jan 2004

President's Report Card To Board Of Trustees, 2004-10, Clemson University

President's Reports to the Board of Trustees

No abstract provided.

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President's Report Card To Board Of Trustees, 2004-07, Clemson University Jan 2004

President's Report Card To Board Of Trustees, 2004-07, Clemson University

President's Reports to the Board of Trustees

No abstract provided.

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The Host Of Grb 030323 At Z=3.372: A Very High Column Density Dla System With A Low Metallicity, P. M. Vreeswijk, S. L. Ellison, C. Ledoux, R. A. M. J. Wijers, J. P. U. Fymbo, P. Møller, A. Henden, J. Hjorth, G. Masi Jan 2004

The Host Of Grb 030323 At Z=3.372: A Very High Column Density Dla System With A Low Metallicity, P. M. Vreeswijk, S. L. Ellison, C. Ledoux, R. A. M. J. Wijers, J. P. U. Fymbo, P. Møller, A. Henden, J. Hjorth, G. Masi

Publications

We present photometry and spectroscopy of the afterglow of GRB 030323. VLT spectra of the afterglow show damped Lyα(DLA) absorption and low- and high-ionization lines at a redshift z =3.3718 ±0.0005. The inferred neutral hy-drogen column density, log N(H i) =21.90±0.07, is larger than any (GRB- or QSO-) DLA H  column density inferred directly from Lyαin absorption. From the afterglow photometry, we derive a conservative upper limit to the host-galaxy extinction: AV <0.5 mag. The iron abundance is [Fe/H] =−1.47 ±0.11, while the metallicity of the gas as measured from sulphur is [S/H] =−1.26 ±0.20. We derive an upper limit on the H2 molecular fraction of 2N(H2)/(2N(H2) +N(H i)) <∼10−6.In the Lyαtrough, a Lyαemission line is detected, which corresponds to a star-formation rate (not corrected for dust extinction) of roughly 1 Myr−1. All these results are consistent with the host galaxy of GRB 030323 consisting of a low metallicity gas with a low dust content. We detect fine-structure lines of silicon, Si*, which have never been clearly detected in QSO-DLAs; this suggests that these lines are produced in the vicinity of the GRB explosion site. Under the assumption that these fine-structure levels are populated by particle collisions, we estimate the H  volume density to be nH i =102−104 cm−3.HST/ACS imaging 4 months after the burst shows an extended AB(F606W) =28.0 ±0.3 mag object at a distance of 0.14 (1 kpc) from the early afterglow location, which presumably is the host galaxy of GRB 030323.

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Faculty Senate Minutes, 2004 Meetings, Clemson University Jan 2004

Faculty Senate Minutes, 2004 Meetings, Clemson University

Faculty Senate Minutes

No abstract provided.

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A Multi-Objective Decision-Making Framework For Transportation Investments, Mashrur Chowdhury, Pulin Tan Jan 2004

A Multi-Objective Decision-Making Framework For Transportation Investments, Mashrur Chowdhury, Pulin Tan

Publications

This paper presents a framework based on multi-objective optimization that can be used to generate and analyze the most desirable transportation investment options based on their objectives and constraints. The framework, which is based on the surrogate worth trade-off analysis, could be applied to both discrete or continuous decision-problem scenarios. In a discrete problem, a predefined set of alternatives is available, whereas continuous problems are not characterized by a predefined set of alternatives. This framework was applied with the data generated for a Capital Beltway Corridor investment study. The multi-objective decision-making framework was found to be adaptable to this typical …

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Clemson Catalog, 2004-2005, Volume 79, Clemson University Jan 2004

Clemson Catalog, 2004-2005, Volume 79, Clemson University

Clemson Catalog (undergraduate announcements)

No abstract provided.

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Clemson Commencement Program, December 2003, Clemson University Dec 2003

Clemson Commencement Program, December 2003, Clemson University

Clemson Commencement Programs

No abstract provided.

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The Tiger Vol. 97 Issue 8 2003-10-31, Clemson University Oct 2003

The Tiger Vol. 97 Issue 8 2003-10-31, Clemson University

Tiger Newspapers

No abstract provided.

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The Tiger Best Of Clemson 2003-10-10, Clemson University Oct 2003

The Tiger Best Of Clemson 2003-10-10, Clemson University

Tiger Newspapers

No abstract provided.

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The Tiger Vol. 97 Issue 5 2003-09-26, Clemson University Sep 2003

The Tiger Vol. 97 Issue 5 2003-09-26, Clemson University

Tiger Newspapers

No abstract provided.

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Supernova Reverse Shocks: Sic Growth And Isotopic Composition, Ethan A-N. Deneault, Donald D. Clayton, Alexander Heger Sep 2003

Supernova Reverse Shocks: Sic Growth And Isotopic Composition, Ethan A-N. Deneault, Donald D. Clayton, Alexander Heger

Publications

We present new mechanisms by which the isotopic compositions of X-type grains of presolar SiC are altered by reverse shocks in Type II supernovae. We address three epochs of reverse shocks: pressure wave from the H envelope near t ¼ 106 s, reverse shock from the presupernova wind near 108–109 s, and reverse shock from the interstellar medium near 1010 s. Using one-dimensional hydrodynamics we show that the first creates a dense shell of Si and C atoms near 106 s in which the SiC surely condenses. The second reverse shock causes precondensed grains to move rapidly forward through decelerated …

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Clemson Commencement Program, August 2003, Clemson University Aug 2003

Clemson Commencement Program, August 2003, Clemson University

Clemson Commencement Programs

No abstract provided.

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A Parallel Implementation Of The Glowinski-Pironneau Algorithm For The Modified Stokes Problem, Lawrence Kelly Waters Aug 2003

A Parallel Implementation Of The Glowinski-Pironneau Algorithm For The Modified Stokes Problem, Lawrence Kelly Waters

All Dissertations

In this dissertation we consider a parallel implementation of the Glowinski-Pironneau algorithm for the modified Stokes problem. In particular, we motivate this effort by demonstrating the occurrence of the modified Stokes problem in the time dependent viscoelastic Oldroyd flow setting using Saramito's splitting. We then present an analysis of the Glowinski-Pironneau pressure decomposition for the modified Stokes problem - including numerical error estimates. Next we discuss our parallel finite element method implementation of the pressure decomposition approach. Finally, we present numerical results including errors and performance measures. These measures are also compared with results for a coupled velocity-pressure modified Stokes …

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Clemson Trustees Minutes, 2003 May 16, Clemson University Board Of Trustees May 2003

Clemson Trustees Minutes, 2003 May 16, Clemson University Board Of Trustees

Minutes

Minutes of the Teleconference of The Clemson University Board of Trustees. President's Conference Room, Clemson University, Clemson, SC.

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Clemson Commencement Program, May 2003, Clemson University May 2003

Clemson Commencement Program, May 2003, Clemson University

Clemson Commencement Programs

No abstract provided.

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The Tiger Vol. 96 Issue 21 2003-04-11, Clemson University Apr 2003

The Tiger Vol. 96 Issue 21 2003-04-11, Clemson University

Tiger Newspapers

No abstract provided.

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Ampnet - A Highly Available Cluster Interconnection Network, Amy Apon, Larry Bilbur Apr 2003

Ampnet - A Highly Available Cluster Interconnection Network, Amy Apon, Larry Bilbur

Publications

No abstract provided.

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The Tiger Vol. 96 Issue 15 2003-02-14, Clemson University Feb 2003

The Tiger Vol. 96 Issue 15 2003-02-14, Clemson University

Tiger Newspapers

No abstract provided.

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The Tiger Vol. 96 Issue 14 2003-02-07, Clemson University Feb 2003

The Tiger Vol. 96 Issue 14 2003-02-07, Clemson University

Tiger Newspapers

No abstract provided.

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