Digital Commons Network^™

A New General Purpose Event Horizon Finder For 3d Numerical Spacetimes, Peter Diener

Faculty Publications

I present a new general purpose event horizon finder for full 3D numerical spacetimes. It works by evolving a complete null surface backwards in time. The null surface is described as the zero-level set of a scalar function, which in principle is defined everywhere. This description of the surface allows the surface, trivially, to change topology, making this event horizon finder able to handle numerical spacetimes where two (or more) black holes merge into a single final black hole.

Small Magellanic Cloud-Type Interstellar Dust In The Milky Way, Lynne A. Valencic, Geoffrey C. Clayton, Karl D. Gordon, Tracy L. Smith

Faculty Publications

It is well known that the sight line toward HD 204827 in the cluster Trumpler 37 shows a UV extinction curve that does not follow the average Galactic extinction relation. However, when a dust component, fore-ground to the cluster, is removed, the residual extinction curve is identical to that found in the SMC within the uncertainties. The curve is very steep and has little or no 2175 A bump. The position of HD 204827 in the sky is projected onto the edge of the Cepheus IRAS bubble. In addition, HD 204827 has an IRAS bow shock, indicating that it may …

New Constraints On Ωm, Ωλ And W From An Independent Set Of 11 High-Redshift Supernovae Observed With The Hubble Space Telescope, R. A. Knop, G. Aldering, R. Amanullah, P. Astier, G. Blanc, M. S. Burns, A. Conley, S. E. Deustua, M. Doi, R. Ellis, S. Fabbro, G. Folatelli, A. S. Fruchter, G. Garavini, S. Garmond, K. Garton, R. Gibbons, G. Goldhaber, A. Goobar, D. E. Groom, D. Hardin, I. Hook, D. A. Howell, A. G. Kim, B. C. Lee, C. Lidman, J. Mendez, S. Nobili, P. E. Nugent, R. Pain, N. Panagia, C. R. Pennypacker, S. Perlmutter

Faculty Publications

We report measurements of ΩM, ΩΛ nd w from 11 supernovae (SNe) at z = 0.36-0.86 with high-quality light curves measured using WFPC2 on the Hubble Space Telescope (HST). This is an independent set of high-redshift SNe that confirms previous SN evidence for an accelerating universe. The high-quality light curves available from photometry on WFPC2 make it possible for these 11 SNe alone to provide measurements of the cosmological parameters comparable in statistical weight to the previous results. Combined with earlier Supernova Cosmology Project data, the new SNe yield a measurement of the mass density ΩM = 0.25 -0.06+0.07 (statistical) …

Faculty Senate Resolution 04-01, Louisiana State University And Agricultural & Mechanical College

LSU Faculty Senate Publications

Faculty Senate Resolution on adding an undergraduate student to the Faculty Senate general election committee, adopted on November 7, 2003.

High Throughput Virus-Induced Gene Silencing Implicates Heat Shock Protein 90 In Plant Disease Resistance, Rui Lu, Isabelle Malcuit, Peter Moffett, Maria T. Ruiz, Jack Peart, Ai Jiuan Wu, John P. Rathjen, Abdelhafid Bendahmane, Louise Day, David C. Baulcombe

Faculty Publications

Virus-induced gene silencing was used to assess the function of random Nicotiana benthamiana cDNAs in disease resistance. Out of 4992 cDNAs tested from a normalized library, there were 79 that suppressed a hypersensitive response (HR) associated with Pto-mediated resistance against Pseudomonas syringae. However, only six of these clones blocked the Pto-mediated suppression of P. syringae growth. The three clones giving the strongest loss of Pto resistance had inserts corresponding to HSP90 and also caused loss of Rx-mediated resistance against potato virus X and N-mediated tobacco mosaic virus resistance. The role of HSP90 as a cofactor of disease resistance is associated …

Heralded Two-Photon Entanglement From Probabilistic Quantum Logic Operations On Multiple Parametric Down-Conversion Sources, Todd B. Pittman, Michelle M. Donegan, Michael J. Fitch, Bryan C. Jacobs, James D. Franson, Pieter Kok, Hwang Lee, Jonathan P. Dowling

Faculty Publications

An ideal controlled-NOT gate followed by projective measurements can be used to identify specific Bell states of its two input qubits. When the input qubits are each members of independent Bell states, these projective measurements can be used to swap the post-selected entanglement onto the remaining two qubits. Here we apply this strategy to produce heralded two-photon polarization entanglement using Bell states that originate from independent parametric down-conversion sources, and a particular probabilistic controlled-NOT gate that is constructed from linear optical elements. The resulting implementation is closely related to an earlier proposal by Sliwa and Banaszek, and can be intuitively …

Pelvic Sexual Dimorphism In A Metatherian, Didelphis Virginiana: Implications For Eutherians, Robert G. Tague

Faculty Publications

Eutherians give birth to relatively large infants. Females have larger pelves than males, though males typically have larger nonpelvic bones. Pelvic dimorphism is an adaptation for parturition. Metatherian females, who give birth to markedly small infants, should not show pelvic adaptations for parturition and should have smaller pelves than males. Adult females and males of the Virginia opossum, Didelphis virginiana, are compared. Males are significantly larger than females in absolute size for 14 of 16 pelvic and 8 nonpelvic measures. Sexes did not differ significantly for lower iliac length and posterior space of midplane. However, relative lengths for females are …

Similar Gene Structure Of Two Sox9a Genes And Their Expression Patterns During Gonadal Differentiation In A Teleost Fish, Rice Field Eel (Monopterus Albus), Rongjia Zhou, Li Liu, Yiqing Guo, Hongshi Yu, Hanhua Cheng, Xiao Huang, Terrence R. Tiersch, Philippe Berta

Faculty Publications

The Sox9 gene encodes a transcription factor that is critical for testis determination and chondrogenesis in vertebrates. Mutations in human SOX9 cause campomelic dysplasia, a dominant skeletal dysmorphology syndrome often associated with male to female sex reversal. Here we show that the Sox9a gene was duplicated during evolution of the rice field eel, Monopterus albus, a freshwater fish which undergoes natural sex reversal from female to male during its life, and has a haploid genome size (0.6-0.8 pg) that is among the smallest of the vertebrates. The duplicated copies of the gene (named Sox9a1 and Sox9a2) fit within the Sox9 …

Rules And Fuzzy Rules In Text: Concept, Extraction And Usage, D. H. Kraft, M. J. Martín-Bautista, J. Chen, D. Sánchez

Faculty Publications

Several concepts and techniques have been imported from other disciplines such as Machine Learning and Artificial Intelligence to the field of textual data. In this paper, we focus on the concept of rule and the management of uncertainty in text applications. The different structures considered for the construction of the rules, the extraction of the knowledge base and the applications and usage of these rules are detailed. We include a review of the most relevant works of the different types of rules based on their representation and their application to most of the common tasks of Information Retrieval such as …

Laplace And Segal-Bargmann Transforms On Hermitian Symmetric Spaces And Orthogonal Polynomials, Mark Davidson, Gestur Ólafsson, Genkai Zhang

Faculty Publications

Let D = G/K be a complex bounded symmetric domain of tube type in a complex Jordan algebra V and let Dℝ = J ∩ D ⊂ D be its real form in a formally real Euclidean Jordan algebra J ⊂ V; Dℝ = H/L is a bounded realization of the symmetric cone in J. We consider representations of H that are gotten by the generalized Segal-Bargmann transform from a unitary G-space of holomorphic functions on D to an L2-space on DR. We prove that in the unbounded realization the inverse of the unitary part of the restriction map is …

The Remarkable Rapid X-Ray, Ultraviolet, Optical And Infrared Variability In The Black Hole Xte J1118+480, R. I. Hynes, C. A. Haswell, W. Cui, C. R. Shrader, K. O'Brien, S. Chaty, D. R. Skillman, J. Patterson, Keith Horne

Faculty Publications

The transient black-hole binary XTE J1118+480 exhibited dramatic rapid variability at all wavelengths which were suitably observed during its 2000 April-July outburst. We examine time-resolved X-ray, ultraviolet, optical and infrared data spanning the plateau phase of the outburst. We find that both X-ray and infrared bands show large amplitude variability. The ultraviolet and optical variability is more subdued, but clearly correlated with that seen in the X-rays. The ultraviolet, at least, appears to be dominated by the continuum, although the lines are also variable. Using the X-ray variations as a reference point, we find that the ultraviolet (UV) variability at …

F03rs Sgb No. 18 (Election Code), Griggs, Hebert

Student Senate Enrolled Legislation

A Bill

to amend the SG Election Code to allow for two (2) additional polling locations on the LSU A&M Campus

F02rs Sgr No. 5 (Aacc), Fisher, Gipson, Calvin

Student Senate Enrolled Legislation

A RESOLUTION

to demand that the African-American Cultural Center (AACC), Helen M. Carter House and the Agnes Morris House not be demolished, as is currently suggested by the LSU Master Plan Committee, unless facilities can be guaranteed that would conform to the reasonable guidelines set forth by their respective advisory councils and directors

Cultural Variations Of Internet Development And Use, Hong Xu, Bin Li, Silvia Barcellos Southwick, Anita Komlodi, Tracy Haidar

Faculty Publications

We are rapidly constructing a global network infrastructure for moving information across national boundaries. Is there a universal way of developing and using the Internet across different geographic areas with different culture? The first panelist in this session will discuss cultural, economic, political systems differences between United States and China in Internet development and Internet use. Second presentation will focus on cultural and social issues in adopting Internet technology in Brazil. The next two presentations will examine how cultural background affects information seeking behavior of Web users from different culture.

Quantum Noise In Gravitational-Wave Interferometers: Overview And Recent Developments, Thomas Corbitt, Nergis Mavalvala

Faculty Publications

We present an overview of quantum noise in gravitational wave interferometers. Gravitational wave detectors are extensively modified variants of a Michelson interferometer and the quantum noise couplings are strongly influenced by the interferometer configuration. We describe recent developments in the treatment of quantum noise in the complex interferometer configurations of present-day and future gravitational-wave detectors. In addition, we explore prospects for the use of squeezed light in future interferometers, including consideration of the effects of losses, and the choice of optimal readout schemes.

Writings On Slavery And The American Civil War, Janet M. Cramer

Civil War Book Review

Anglo-Abolitionist

Travel account reveals British perspective

Annotations, Cwbr_Editor

Civil War Book Review

No abstract provided.

Louisiana’S Green Industry: Evaluation Of Its Economic Contribution (Research Information Sheet #108), Roger A. Hinson, Raul Pinel, David W. Hughes

LSU AgCenter Research Information Sheets

The green industry is the production, sale and maintenance of ornamental plants and related products. The purpose of this study was to estimate the impact of the green industry on Louisiana’s economy.

Credit Card Usage Of College Students: Evidence From Louisiana State University (Research Information Sheet #107), Frances C. Lawrence, Rebecca C. Christofferson, Susan E. Nester, E. Barry Moser, Jeanette A. Tucker, Angela C. Lyons

LSU AgCenter Research Information Sheets

In recent years, there has been a dramatic growth in credit card usage among college students. How are Louisiana State University undergraduates using credit cards? Are LSU students managing credit card debt wisely? What can LSU do to offer the appropriate kinds of help to enable students to be financially literate? These are the issues addressed in this publication.

Scientific Collaboratories In Higher Education: Exploring Learning Style Preferences And Perceptions Of Technology, Diane H. Sonnenwald, Bin Li

Faculty Publications

Scientific collaboratories hold the promise of providing students access to specialized scientific instruments, data and experts, enabling learning opportunities perhaps otherwise not available. However, evaluation of scientific collaboratories in higher education has lagged behind their development. We conducted a repeated-measures study that provided data regarding social interaction learning styles and perceptions of a scientific collaboratory system from 40 university science students working face-to-face and remotely. Students with a strong competitive learning style preference or who worked with a student with a strong competitive learning style reported a slightly more positive perception of the relative advantage, compatibility and complexity of the …

Galvanized Yankees On The Upper Missouri: The Face Of Loyalty, Michele Tucker Butts

Civil War Book Review

Michele Tucker Butts is an associate professor of history at Austin Peay State University, where she teaches the history of the American West and Native American history. She has authored several articles and has contributed to both The Encyclopedia of the Great Plains and the Encyclop....

The Stand Of The Us Army At Gettysburg, Kent Gramm

Civil War Book Review

This review is also available under the following title: Gett....

Gettysburg: The Meade-Sickles Controversy, Kent Gramm

Civil War Book Review

Separate strategies

Scholar compares diverse approaches to analyzing battle

Well Posed Constraint-Preserving Boundary Conditions For The Linearized Einstein Equations, Gioel Calabrese, Jorge Pullin, Oscar Reula, Olivier Sarbach, Manuel Tiglio

Faculty Publications

In this paper we address the problem of specifying boundary conditions for Einstein's equations when linearized around Minkowski space using the generalized Einstein-Christoffel symmetric hyperbolic system of evolution equations. The boundary conditions we work out guarantee that the constraints are satisfied provided they are satisfied on the initial slice and ensures a well posed initial-boundary value formulation. We consider the case of a manifold with a non-smooth boundary, as is the usual case of the cubic boxes commonly used in numerical relativity. The techniques discussed should be applicable to more general cases, as linearizations around more complicated backgrounds, and may …

Fanatics And Fire-Eaters: Newspapers And The Coming Of The Civil War, Steve Tripp

Civil War Book Review

The power of the press

Authors inspect journalism's influence

Development And Evolution Of The Amniote Integument: Current Landscape And Future Horizon, Cheng Ming Chuong, Dominique G. Homberger

Faculty Publications

This special issue on the development and evolution of the amniote integument begins with a discussion of the adaptations to terrestrial conditions, the acquisition of water-impermeability by the reptilian integument, and the initial formation of filamentous integumentary appendages that pave the way towards avian flight. Recent feather fossils are reviewed and a definition of feathers is developed. Hierarchical models are proposed for the formation of complex structures, such as feathers. Molecular signals that alter the phenotype of integumentary appendages at different levels of the hierarchy are presented. Tissue interactions and the roles of keratins in evolution are discussed and linked …

Contributions Of Atmospheric Co And Hydrogen Uptake To Microbial Dynamics On Recent Hawaiian Volcanic Deposits, Gary M. King

Faculty Publications

A series of sites were established on Hawaiian volcanic deposits ranging from about 18 to 300 years old. Three sites occurred in areas that supported tropical rain forests; the remaining sites were in areas that supported little or no plant growth. Sites >26 years old consumed atmospheric CO and hydrogen at rates ranging from about 0.2 to 5 mg of CO m-2 day-1 and 0.1 to 4 mg of H2 m-2 day-1, respectively. Respiration, measured as CO2 production, for a subset of the sites ranged from about 40 to > 1,400 mg of CO2 m-2 day-1. CO and H2 accounted for …

From Shiloh To Savannah: The Seventh Illinois Infantry In The Civil War, B. Franklin Cooling

Civil War Book Review

Military Memoir

A newly annotated edition of Ambrose's account

Chromatin Of Endoreduplicated Pavement Cells Has Greater Range Of Movement Than That Of Diploid Guard Cells In Arabidopsis Thaliana, Naohiro Kato, Eric Lam

Faculty Publications

In the current model of chromatin organization in the interphase cell nucleus, chromosomes are organized into territories. Although constrained diffusion of chromatin in interphase cells has been confirmed in all cell types examined, little is known about chromatin dynamics in plant interphase cells. In this work, we measured for the first time interphase chromatin dynamics in plants using the green-fluorescent-protein-mediated chromatin-tagging system. Moreover, we compared the dynamics of diploid guard cells and endoreduplicated pavement cells. The movement of tagged loci in live seedlings shows constrained behavior in both types of nuclei. However, we found that the apparent confinement area for …

Predicting Severe Wildfire Years In The Florida Everglades, Brian Beckage, William J. Platt

Faculty Publications

© 2003 The Ecological Society of America. Wildfires result in important ecological benefits to many ecosystems, but have costs associated with fire fighting and property loss. Accurate, timely forecasts of the severity of upcoming wildfire seasons could facilitate wildfire management, limiting the most destructive aspects of fires, while preserving their ecological benefits. We demonstrate an approach where time series models are used to predict the severity of the wildfire season in Everglades National Park in southern Florida 3 months and 1 year beforehand. Model predictions contained all obserations within a 90% credible interval and also anticipated severe wildfire seasons. These …