Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Louisiana State University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 34741 - 34770 of 45177

Full-Text Articles in Entire DC Network

Close-Limit Approximation To Neutron Star Collisions, Gabrielle D. Allen, Jorge A. Pullin Jan 1999

Close-Limit Approximation To Neutron Star Collisions, Gabrielle D. Allen, Jorge A. Pullin

Faculty Publications

We develop a close-limit approximation to the head-on collision of two neutron stars similar to that used to treat the merger of black hole binaries. This approximation can serve as a useful benchmark test for future fully non-linear studies. For neutron star binaries, the close-limit approximation involves assuming that the merged object can be approximated as a perturbed, stable neutron star during the ring-down phase of the coalescence. We introduce a prescription for the construction of initial data sets, discuss the physical plausibility of the various assumptions involved, and briefly investigate the character of the gravitational radiation produced during the …

Go to article

Inspiraling Black Holes: The Close Limit, Gaurav Khanna, John Baker, Reinaldo J. Gleiser, Pablo Laguna, Carlos O. Nicasio, Hans Peter Nollert, Richard Price, Jorge Pullin Jan 1999

Inspiraling Black Holes: The Close Limit, Gaurav Khanna, John Baker, Reinaldo J. Gleiser, Pablo Laguna, Carlos O. Nicasio, Hans Peter Nollert, Richard Price, Jorge Pullin

Faculty Publications

We calculate an estimate of the gravitational radiation emitted when two equal mass black holes coalesce at the end of their binary inspiral, using several approximations based on considering the holes close to each other. A shortcoming of our method is that it is limited to models forming final holes with slow rotation, but our results clearly suggest a trend for larger angular momenta. We find that about 1% of the mass energy of the pair will emerge as gravitational waves during the final stages of the collision and that a negligible fraction of the angular momentum will be radiated. …

Go to article

Collision Of Boosted Black Holes: Second Order Close Limit Calculations, Carlos O. Nicasio, Reinaldo J. Gleiser, Richard H. Price, Jorge Pullin Jan 1999

Collision Of Boosted Black Holes: Second Order Close Limit Calculations, Carlos O. Nicasio, Reinaldo J. Gleiser, Richard H. Price, Jorge Pullin

Faculty Publications

We study the head-on collision of black holes starting from unsymmetrized, Brill-Lindquist type data for black holes with non-vanishing initial linear momentum. Evolution of the initial data is carried out with the “close limit approximation,” in which small initial separation and momentum are assumed, and second-order perturbation theory is used. We find agreement that is remarkably good, and that in some ways improves with increasing momentum. This work extends a previous study in which second order perturbation calculations were used for momentarily stationary initial data, and another study in which linearized perturbation theory was used for initially moving holes. In …

Go to article

An Overview Of Canonical Quantum Gravity, Jorge Pullin Jan 1999

An Overview Of Canonical Quantum Gravity, Jorge Pullin

Faculty Publications

This paper presents a brief review of current results on the canonical quantization of general relativity using Ashtekar's variables and loop quantization.

Go to article

The Close Limit Of Colliding Black Holes: An Update, Jorge Pullin Jan 1999

The Close Limit Of Colliding Black Holes: An Update, Jorge Pullin

Faculty Publications

This is the writeup of the talk I gave at the Yukawa International Symposium at Kyoto, Japan on June 29, 1999. The talk summarizes the present status of the close limit approximation for colliding black holes.

Go to article

Role Of Negative Ion Resonances In Electron Scattering From Atoms And Molecules, S. J. Buckman, D. T. Alle, M. J. Brennan, P. D. Burrow, J. C. Gibson, R. J. Gulley, M. Jacka, D. S. Newman, A. R.P. Rau, J. P. Sullivan, K. W. Trantham D Jan 1999

Role Of Negative Ion Resonances In Electron Scattering From Atoms And Molecules, S. J. Buckman, D. T. Alle, M. J. Brennan, P. D. Burrow, J. C. Gibson, R. J. Gulley, M. Jacka, D. S. Newman, A. R.P. Rau, J. P. Sullivan, K. W. Trantham D

Faculty Publications

Transient negative ions (resonances) formed during the collision of an electron with an atom or molecule have been extensively studied for over thirty years. The continued interest in these states, both experimentally and theoretically, stems from the profound effects that they can have on electron scattering cross sections and the role that electron-electron correlations play in their formation and quasi-stability. A selective discussion of examples of such resonances, involving one, two and three excited electrons is given for a wide range of atomic and molecular systems. © CSIRO 1999.

Go to article

Ranking Political Science Departments: Do Publications Matter?, James C. Garand, Krisfy L. Graddy Jan 1999

Ranking Political Science Departments: Do Publications Matter?, James C. Garand, Krisfy L. Graddy

Faculty Publications

No abstract provided.

Go to article

Physicochemical Influences On Parasites Of Age-0 Largemouth Bass In The Atchafalaya River Basin, Louisiana, Randy C. Landry, William E. Kelso Jan 1999

Physicochemical Influences On Parasites Of Age-0 Largemouth Bass In The Atchafalaya River Basin, Louisiana, Randy C. Landry, William E. Kelso

Faculty Publications

We investigated prevalence and intensity patterns of nine parasite taxa in 244 age-0 largemouth bass (Micropterus salmoides) collected from lake (high dissolved oxygen levels), riverine (high current velocities), and swamp (hypoxic canals and bayous) sites (N=6) in the Atchafalaya River Basin during the 1996 flood pulse. Ectoparasites were dominated by monogenetic trematodes (prevalence=100%; median intensities 27–91 per host) and glochidia (prevalence > 96% at all sites, median intensities 47–148 per host), whereas Posthodiplostomum minimum (Trematoda), Caecincola spp. (Trematoda; C. parvulus and perhaps C. latostoma), Neoechinorhynchus cylindratus (Acanthocephala), and Proteocephalus ambloplitis (Cestoda) accounted for 94.6% of bass endoparasites. Overall, lake sites supported …

Go to article

Bird Communities In Two Types Of Anthropogenic Successional Vegetation In Central Amazonia, Sérgio Henrique Borges, Philip C. Stouffer Jan 1999

Bird Communities In Two Types Of Anthropogenic Successional Vegetation In Central Amazonia, Sérgio Henrique Borges, Philip C. Stouffer

Faculty Publications

When primary forest in central Amazonia is cut and abandoned, the plant succession is dominated by Cecropia spp., whereas when it is cut and burned for pastures, the regrowth vegetation is dominated by Vismia spp. The bird communities of these two regrowth forest types were sampled at six sites (9-13 years old) using mist-nets and observations. Bird species richness was similar between the two forest types. Cecropia regrowth, however, was richer for strictly forest bird species than was Vismia regrowth. Mixed-flock species and ant-following birds were significantly more abundant in the Cecropia second growth, whereas nonforest insectivores and omnivores were …

Go to article

Certification In Honduras: Perspectives Of Wood Product Manufacturers, Consumers, Ngos And Government Forest Policymakers, Richard P. Vlosky, Juan Antonio Aguirre, Edna Carolina Soihet Montes, Lucie K. Ozanne, Gabriela Silva Jan 1999

Certification In Honduras: Perspectives Of Wood Product Manufacturers, Consumers, Ngos And Government Forest Policymakers, Richard P. Vlosky, Juan Antonio Aguirre, Edna Carolina Soihet Montes, Lucie K. Ozanne, Gabriela Silva

Faculty Publications

Although research has been conducted that examines certification issues from stakeholder perspectives in temperate forest regions, very little has been done in tropical supplier countries. This study identifies key certification issues in Honduras, a Central American producer and exporter of forest products. Five stakeholder groups were studied: primary wood products manufacturers, secondary manufacturers, government forestry policymakers, non-governmental organizations and consumers. Results indicate that there a general lack of awareness about certification, an increasing willingness-to-pay for certification as one moves from the forest to the consumer, the need for transparency in the process, and the belief that certification should be conducted …

Go to article

Sweetpotato Clone Tolerance To Weed Interference, Don R. La Bonte, Howard F. Harrison, Carl E. Motsenbocker Jan 1999

Sweetpotato Clone Tolerance To Weed Interference, Don R. La Bonte, Howard F. Harrison, Carl E. Motsenbocker

Faculty Publications

Field experiments were conducted to assess how sweetpotato [Ipomoea batatas (L.) Lam.] clones interfere with weeds and how clones tolerate weed interference. Eleven clones with architecturally different canopies were evaluated for yield, canopy surface area and dry mass, weed dry mass, and light interception at ground level. A 2-fold difference in ground area covered by canopy surface area was observed among the eleven clones 42 days after planting, and a 3-fold difference in canopy dry mass at harvest. Yields were reduced from 14% to 68% by weed interference. The yields of high-yielding clones, 'Beauregard', 'Excel', L87-125, 'Regal', 'Centennial', and W-274, …

Go to article

Effects Of 4 X 4 Block Scheduling On Student Discipline, Faculty Collegiality, And Obstacles To Teaching In Louisiana High Schools., Mary Helen Smith Mccoy Jan 1999

Effects Of 4 X 4 Block Scheduling On Student Discipline, Faculty Collegiality, And Obstacles To Teaching In Louisiana High Schools., Mary Helen Smith Mccoy

LSU Historical Dissertations and Theses

During the last decade, the allocation of time emerged as an important reform initiative in secondary schools. For nearly a century, secondary school students attended approximately six to seven classes daily. In the early 1990s, more flexible scheduling configurations were proposed, including block scheduling. One block scheduling format, known as 4 x 4, allows students to attend four classes daily for 90-minute blocks of time. Block scheduling advocates claimed benefits for students, teachers, instructional innovation, and school climate, but provided little empirical base for these claims. The present study examined the effects of 4 x 4 block scheduling on four …

Go to article

Single And Combined Effects Of Nematode Communities And Pythium Arrhenomanes On The Growth And Yield Of Sugarcane In Louisiana., Jason Payton Bond Jan 1999

Single And Combined Effects Of Nematode Communities And Pythium Arrhenomanes On The Growth And Yield Of Sugarcane In Louisiana., Jason Payton Bond

LSU Historical Dissertations and Theses

A survey conducted from May 1995 through August 1998 revealed diverse nematode communities in sugarcane fields in Louisiana. High populations of Mesocriconema, Paratrichodorus, Pratylenchus, and Tylenchorhynchus were widespread in nine sugarcane production parishes. Comparisons of plant cane and ratoon sugarcane crops indicated that nematode community levels increase significantly in successive ratoon crops. Greenhouse experiments evaluated the susceptibility of sugarcane cultivars to a nematode community comprised of Mesocriconema xenolax, Paratrichodorus minor, and Tylenchorhynchus annulatus. Across years (1995 and 1996) and cultivars (CP 65--357, CP 70--321, LCP 82--89, HoCP 85--845, and LCP 86--454), plant height, shoot length, top and root dry weight, …

Go to article

Path Analysis Of Psychosocial Models Of Binge Eating In Obesity., Leslie Garl Womble Jan 1999

Path Analysis Of Psychosocial Models Of Binge Eating In Obesity., Leslie Garl Womble

LSU Historical Dissertations and Theses

The purpose of this study was to test a cross-sectional psychosocial etiological model of binge eating in obesity using path analysis. Depression, dietary restraint, self-esteem, weight cycling, history of teasing, body dissatisfaction, concern for physical appearance, negative perception of physical appearance, media exposure, and social pressure to maintain a thin ideal were 'state' social learning constructs that were tested as correlates of binge eating. Personality variables such as neuroticism, extraversion, agreeableness, and conscientiousness were stable 'trait' variables that were tested as correlates. The study sample was 808 adults, including 444 women with a mean age of 33.35 (SD = 13.60) …

Go to article

Parental Participation In A Title I Family Literacy Program: Results From A Mixed -Model Study., Karen Boudreaux Jan 1999

Parental Participation In A Title I Family Literacy Program: Results From A Mixed -Model Study., Karen Boudreaux

LSU Historical Dissertations and Theses

A family literacy, Title I program was studied to determine the attitudes and beliefs which affect parental participation in a family literacy program. The theoretical framework of cultural capitol assumed that parents who chose to participate in a family literacy program possess different components in their cultural capitol than parents who choose not to participate. There were 3 Hypotheses and 6 Study Questions which guided this parallel mixed model study with dominant (qualitative)-less dominant (quantitative) design. A Title I Family Literacy Program located in a large, urban, public school system was the study site. The sample size consisted of 40 …

Go to article

Minor-Equivalence For Infinite Graphs, Bogdan Oporowski Jan 1999

Minor-Equivalence For Infinite Graphs, Bogdan Oporowski

Faculty Publications

Two graphs are minor-equivalent if each is isomorphic to a minor of the other. In this paper, we give structural characterizations of the minor equivalence classes of the infinite full grid GZ×L and of the infinite half-grid GZ×N. A corollary of these results states that every minor of GZ×z that has a minor isomorphic to GZ×N is minor-equivalent to one of GZ×Z or GZ×N. © 1999 Elsevier Science B.V. All rights reserved.

Go to article

Characterization Of A Simian Hemorrhagic Fever Virus Large Envelope Glycoprotein Gene And Its Product., Xiaochun Wang Jan 1999

Characterization Of A Simian Hemorrhagic Fever Virus Large Envelope Glycoprotein Gene And Its Product., Xiaochun Wang

LSU Historical Dissertations and Theses

The goal of this project was to determine the genome organization, replication strategy and identification of the large envelope glycoprotein (GL) gene of simian hemorrhagic fever virus (SHFV). This virus is the fourth member of the new virus family Arteriviridae. The 3' end of the RNA genome from the prototype isolate of SHFV was cloned and sequenced. This 6,314 nucleotide (nt) sequence consisted of nine complete overlapping open reading frame (ORFs 2, 2a, 3, 4, 5, 6, 7, 8, and 9). At the 5' end of this sequence is a partial ORF, ORF 1b, and the 3' end is a …

Go to article

An Empirical Test Of A Structural Model Of The Dispositional Antecedents Of Motivation To Improve Work Through Learning., Sharon Smith Naquin Jan 1999

An Empirical Test Of A Structural Model Of The Dispositional Antecedents Of Motivation To Improve Work Through Learning., Sharon Smith Naquin

LSU Historical Dissertations and Theses

The development and success of employee training programs necessitates employer awareness of the individual differences of their employees that contribute to their motivation to improve work through learning. And, because of the potential benefits associated with employees who are highly trained, employee motivation to improve work through learning should be a chief concern within organizations. Therefore, a better understanding of the relationship between personality type, affectivity, values, level of work commitment and motivation will provide organizations with valuable insights that will enhance training efforts and contribute to the competitiveness and success of organizations. The purpose of this study was to …

Go to article

Expecting Women: Constructing The Pregnant Woman In Twentieth Century United States And British Dramatic Representation., Amelia Lynn Cuomo Jan 1999

Expecting Women: Constructing The Pregnant Woman In Twentieth Century United States And British Dramatic Representation., Amelia Lynn Cuomo

LSU Historical Dissertations and Theses

Pregnancy and issues surrounding pregnancy such as paternity and legitimacy have been presented in Western Drama since its inception. Pregnancy in the modern era, however, has become a complex issue. Abortion, birth control, and the advent of new reproductive technologies (such as in vitro fertilization) alter understandings of reproduction. This study explores twentieth century British and U.S. dramatic representations of the pregnant woman and analyzes how pregnant women are constructed in drama. The dissertation is divided into five chapters. Chapter One explores four plays by male playwrights: Harley Granville Barker's Waste, Eugene O'Neill's "Abortion," and Sidney Kingsley's Men in White …

Go to article

You Can't Imagine This Life. Diaries And Letters Of A Southern-Jewish Grande Dame, Josephine Joel Heyman, 1901-1993., Cynthia Betty Levy Jan 1999

You Can't Imagine This Life. Diaries And Letters Of A Southern-Jewish Grande Dame, Josephine Joel Heyman, 1901-1993., Cynthia Betty Levy

LSU Historical Dissertations and Theses

Josephine "Jo" Joel Heyman (1901--1993) provides an intimate and touching record of twentieth century upper-middle-class Atlanta-Jewish life through her teenage and young adult diaries and letters. Through her autobiographical writings, this twentieth century Southern-Jewish woman's regional, ethnic, and gender identities are revealed. Mrs. Heyman, an influential civic leader in Atlanta, Georgia, graduated Phi Beta Kappa from Smith College. She began writing diaries as a child to express her private feelings and thoughts, and as a young adult she wrote letters from college to her future fiance. The backdrop of her personal story is the story of the Southern-Jewish community, which …

Go to article

Analysis Of Non-Linear Formation Fracture Resistance Tests Obtained During Oil Well Drilling Operations., Gursat Altun Jan 1999

Analysis Of Non-Linear Formation Fracture Resistance Tests Obtained During Oil Well Drilling Operations., Gursat Altun

LSU Historical Dissertations and Theses

A leak-off test (LOT), commonly known as formation pressure integrity test (PIT), is a verification method to estimate the fracture pressure of exposed formations. After cementing each casing string, a LOT is run to verify that the casing, cement, and formation below the casing seat can withstand the wellbore pressure required to drill safely to the next casing setting depth. Fracture pressure determined from the test is used as the maximum pressure that may be imposed on that formation. Critical drilling decisions for mud weights, casing setting depths, and well control techniques are based upon the result of a LOT. …

Go to article

Avoidance-Avoidance Conflict, Situational Formality, And Personality As Causes Of Interpersonal Equivocation., Richard Steven Bello Jan 1999

Avoidance-Avoidance Conflict, Situational Formality, And Personality As Causes Of Interpersonal Equivocation., Richard Steven Bello

LSU Historical Dissertations and Theses

This study explores the causes of a widespread and important communication phenomenon, interpersonal equivocation. Literature is reviewed which shows clearly that a sufficient cause of interpersonal equivocation is situational avoidance-avoidance conflict, but also which suggests the possibility of additional situational (formality of social setting) and trait (self-monitoring) precursors of equivocation. Using a questionnaire technique, participants were asked to imagine themselves in three different interpersonal situations, which were manipulated to vary the level of situational formality. In addition, in each situation, they were asked to respond to a question from their hypothetical conversational partner. These questions were designed to manipulate the …

Go to article

The Values-Ethical Dimension: Do Bsw Students In State-Supported And Religiously Affiliated Programs Differ?, Wade Milton Tyler Jan 1999

The Values-Ethical Dimension: Do Bsw Students In State-Supported And Religiously Affiliated Programs Differ?, Wade Milton Tyler

LSU Historical Dissertations and Theses

Although an important aspect of any baccalaureate social work program is the inculcation of social work values, there has not been an abundance of studies in this area. Many of those that exist have been criticized for their methodology in measuring values. It is appropriate to examine that which has been termed the "fulcrum" of social work practice relative to the educational processes which purport to put that fulcrum in place. The purpose of this study was to compare BSW students in religiously-affiliated institutions of higher education with those in state-supported institutions on three dimensions: adherence to social work values, …

Go to article

Weierstrass Pairs And Minimum Distance Of Goppa Codes., Gretchen L. Matthews Jan 1999

Weierstrass Pairs And Minimum Distance Of Goppa Codes., Gretchen L. Matthews

LSU Historical Dissertations and Theses

We prove that elements of the Weierstrass gap set of a pair of points may be used to define a geometric Goppa code that has minimum distance greater than the usual lower bound. We determine the Weierstrass gap set of a pair of any two Weierstrass points on a Hermitian curve and use this to increase the lower bound on the minimum distance of certain codes defined using a linear combination of the two points. In particular, we obtain some two-point codes on a Hermitian curve that have better parameters than the one-point code on this curve with the same …

Go to article

Inequalities Between Pythagoras Numbers And Algebraic Ranks In Witt Rings Of Fields., Sidney Taylor Hawkins Jan 1999

Inequalities Between Pythagoras Numbers And Algebraic Ranks In Witt Rings Of Fields., Sidney Taylor Hawkins

LSU Historical Dissertations and Theses

This dissertation establishes new lower bounds for the algebraic ranks of certain Witt classes of quadratic forms. Let K denote a field of characteristic different from 2 and let q be a quadratic form over K. The form q is said to be algebraic when q is Witt equivalent to the trace form qL∣K of some finite algebraic field extension L∣K . When q is algebraic, the algebraic rank of q is defined to be the degree of the minimal extension L∣K whose trace form is Witt equivalent to q. It is an important, unsolved problem to find reasonable bounds …

Go to article

On Biodata Construct Validity, Criterion-Related Validity, And Adverse Impact., Michelle Ann Dean Jan 1999

On Biodata Construct Validity, Criterion-Related Validity, And Adverse Impact., Michelle Ann Dean

LSU Historical Dissertations and Theses

This study examined the personnel selection technique of biographical information (biodata) in terms of theory, criterion-related validity, and adverse impact. First, the construct validity of biodata was examined to determine if biodata theory was useful in explaining biodata's strong criterion validity. Items from an existing biodata inventory were mapped onto construct domains drawn from Mumford, Stokes, and Owens' (1990) ecology model. Relationships between subjects' biodata responses and training performance was examined for consistency with the model's predictions in an organizational sample. The ecology model did not fit the data well. Follow up exploratory analyses did yield good fit when the …

Go to article

Ernest Renan And The Question Of Race., Jane Victoria Dagon Jan 1999

Ernest Renan And The Question Of Race., Jane Victoria Dagon

LSU Historical Dissertations and Theses

Racism in France can be traced back to the 1560's when the nobles claimed to be of a separate race in order to obtain special rights and privileges. Soon after in the seventeenth century, scientists started to classify humans according to physical features. With the increase in travel, the slave trade, the fear of the unknown and the fear of contamination, these factors along with physiognomy and phrenology encouraged "biological racism." During the second half of the nineteenth century, Ernest Renan (1823--1892) denounces biological racism and the existence of the so-called "pure races." He is also the first dramatist to …

Go to article

Metals Release From Freshwater And Estuarine Sediments In Thin-Disk Leaching Columns., Tommy Eldridge Myers Jan 1999

Metals Release From Freshwater And Estuarine Sediments In Thin-Disk Leaching Columns., Tommy Eldridge Myers

LSU Historical Dissertations and Theses

Column leaching tests were conducted on two freshwater sediments and two estuarine sediments. Leachate samples were analyzed for total organic carbon (TOC), cadmium, chromium, copper, iron, manganese, lead, nickel, and zinc. Metal and TOC elution curves for freshwater sediments were fundamentally different from estuarine sediment elution curves. The difference was due to colloid-facilitated transport of metals and TOC in estuarine sediments that was caused by salt washout during leaching with distilled-deionized water. Metals and TOC concentrations in freshwater sediment leachates tended to monotonically decrease from initial pore water concentrations. Leaching of metals and TOC from freshwater sediments was modeled with …

Go to article

Situational Frequency And Retrieval: The Effect Of Revelation On The Judgments For Occurrence Of Events., Craig Barton Neely Jan 1999

Situational Frequency And Retrieval: The Effect Of Revelation On The Judgments For Occurrence Of Events., Craig Barton Neely

LSU Historical Dissertations and Theses

Only one prior experiment has examined the effect of revelation on situational frequency judgments (Exp. 3, Greene, 1996). In the current study, three experiments examined the effect of revelation on frequency estimation. Experiment 1A and 1B replicated and extended the study done by Greene (1996) by increasing the frequencies of study items from one to eight in both a random (1A) and blocked (1B) design. Experiment 2 examined the relation between the frequency of study items and the degree of distortion of the items revealed at test. A significant effect of revelation was found across frequencies for the three revealed …

Go to article

An Evaluation Of Noncontingent Reinforcement Effects As A Function Of Baseline Reinforcement Schedules., Joel Eric Ringdahl Jan 1999

An Evaluation Of Noncontingent Reinforcement Effects As A Function Of Baseline Reinforcement Schedules., Joel Eric Ringdahl

LSU Historical Dissertations and Theses

An evaluation of fixed-time (FT) schedules and extinction was conducted with children who had mild to severe developmental disabilities. The principal research question was: Does the similarity between baseline (i.e., response-dependent) and FT reinforcement rates make behavior resistant to change? During Phase I for each of 13 participants, a reinforcer assessment was conducted. Those individuals for whom a reinforcement effect was demonstrated continued to Phase II. During Phase II, the effects of FT schedules with either similar or dissimilar reinforcer rates (relative to a response-dependent baseline) and extinction were assessed for each participant. Results suggested that both extinction and FT …

Go to article

First Prev Next Last