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Physiology And Lateralization Of Swallowing: A Comparison Between Young And Old Adults., Stephanie Kay Daniels Jan 2001

Physiology And Lateralization Of Swallowing: A Comparison Between Young And Old Adults., Stephanie Kay Daniels

LSU Historical Dissertations and Theses

Age-related changes in discrete swallows have been well researched, but few studies have investigated sequential swallowing with little emphasis on age-related changes. It is also unclear whether the cortical representation of swallowing is lateralized to one hemisphere or is bilaterally represented. As such, the aims of this research were to examine deglutitive biomechanics of sequential straw swallowing (Experiment I), and study swallowing lateralization using a dual task paradigm in healthy, young and old adults (Experiment II). Thirty-eight right-handed men (young = 20, old = 18) were studied. Experiment I: Videofluoroscopic swallow samples of two 10-second straw drinking trials were obtained. …

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Professional Culture And Efficacy Correlates Of Organizational Effectiveness In Cooperative Extension Services., Rebecca Elaine White Jan 2001

Professional Culture And Efficacy Correlates Of Organizational Effectiveness In Cooperative Extension Services., Rebecca Elaine White

LSU Historical Dissertations and Theses

Several important lines of inquiry have been developed during the past fifty years to study the complex nature of educational organizations. In particular, theorists, researchers, and educational policy makers have become increasingly concerned about the effectiveness of educational institutions. Recently, significant research and policy maker attention has been focused on issues of effectiveness of higher education. The Cooperative Extension Services as ancillary outreach units of state land grant universities are no exception and the extant literature has been focused primarily on outcomes as organizational effectiveness measures. This study addresses the need to develop more comprehensive conceptual frameworks for studying perceived …

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Performativity And Performance: Representing The Tattooed Body., Mindy Elaine Fenske Jan 2001

Performativity And Performance: Representing The Tattooed Body., Mindy Elaine Fenske

LSU Historical Dissertations and Theses

In this study I examine visual representations of tattooed bodies in three arenas of cultural production: tattoo conventions, advertising, and neo-tribal books. Through the methodological lens of genealogies of performance, I analyze these texts' construction of the tattooed body as classed, gendered, and exotic. I argue that contemporary representations of the tattooed body resist and reproduce discursive power regimes by surrogating prior cultural performances and representations of performance. I argue that contemporary visual representations of the tattooed body succeed in resisting discursive authority when they performatively cite multiple and transgressive authorities. I additionally indicate that the body in representation transgresses …

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Teacher Efficacy, Administrator Efficacy, School Culture, And Leadership Density., Roy Wade Smith Jan 2001

Teacher Efficacy, Administrator Efficacy, School Culture, And Leadership Density., Roy Wade Smith

LSU Historical Dissertations and Theses

This study examined new means for conceptualizing leadership in schools from a non-centrist perspective. Specifically, leadership in schools was conceived of, and studied as, an organizational construct rather than a set of personal attributes associated with positional authority. This non-centrist view of leadership is termed leadership density (Sergiovanni, 1987; Ellett, 1996), and is metaphorically represented in the study by characteristics of a small jazz combo. The primary focus of the study was the development of a new conceptual model of leadership, grounded within the small jazz combo metaphor. In an attempt to understand leadership from this new perspective, linkages between …

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The Across-Shelf Distribution Of Larval, Postlarval And Juvenile Fishes Collected At Oil And Gas Platforms And A Coastal Jetty Off Louisiana West Of The Mississippi River Delta., Frank Joseph Hernandez Jr Jan 2001

The Across-Shelf Distribution Of Larval, Postlarval And Juvenile Fishes Collected At Oil And Gas Platforms And A Coastal Jetty Off Louisiana West Of The Mississippi River Delta., Frank Joseph Hernandez Jr

LSU Historical Dissertations and Theses

A cross-shelf transect of three petroleum platforms and a coastal rock jetty (another hard-substrate, artificial habitat) in the northcentral Gulf were sampled to examine the role that oil and gas platforms (hard substrate habitat) may play in the early life history stages of reef-dependent and reef-associated fishes. The ichthyoplankton and juvenile fish assemblages were sampled at Green Canyon 18 (GC 18; 230 m depth, shelf slope); Grand Isle 94 (GI 94; 60 m depth, mid-shelf); and South Timbalier 54 (ST 54; 20 m depth, inner shelf) with passive plankton nets and light-traps and at a coastal rock jetty (Belle Pass; …

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Effect Of Chromium, Dried Brewers Yeast, And Mannan Oligosaccharides On Sow Productivity And Growth Performance Of Weanling Pigs., Frederick Masson Lemieux Jr Jan 2001

Effect Of Chromium, Dried Brewers Yeast, And Mannan Oligosaccharides On Sow Productivity And Growth Performance Of Weanling Pigs., Frederick Masson Lemieux Jr

LSU Historical Dissertations and Theses

Five experiments were conducted to evaluate the effects of mannan oligosaccharides (Bio-Mos) on growth performance, carcass characteristics, and pork quality of pigs. The first two experiments evaluated 0.20 and 0.30% Bio-Mos. The data indicated that the 0.20% level of Bio-Mos was more effective, and this level was used in the remainder of the experiments. Interactive effects of Bio-Mos and excess dietary Zn were evaluated in Exp. 2 and 3 and Trial 2 of Exp. 4. In Trial 1 of Exp. 4, Bio-Mos was fed with and without an antibiotic. In addition to the weanling pig experiments, 0.30% Bio-Mos was fed …

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Framing And Counterframing Of The Middle East Peace Process In The Arab -Israeli Press: A Comparative Analysis Of "Assafir" And "The Jerusalem Post"., Houda Hanna El-Koussa Jan 2001

Framing And Counterframing Of The Middle East Peace Process In The Arab -Israeli Press: A Comparative Analysis Of "Assafir" And "The Jerusalem Post"., Houda Hanna El-Koussa

LSU Historical Dissertations and Theses

The Arabs and Israelis have been negotiating peace for the past ten years; however, the conflict still ignites with no apparent hope for any near resolution. Understanding the rhetorical construction of the peace reality may help in managing this conflict. This study examines the symbolic construction of the peace process in the Arab and Israeli press. It comparatively studies how the Arab and Israeli press, through language choice, define peace, elucidate its implications, and judge actors and actions involved in the peace process. This study identifies the metaphors used and the dominant rival frames constructed in two conflicting newspapers, Assafir …

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An Inquiry Into The Influence Of Taped Books On The Oral Reading Performance Of Struggling Third-Grade Readers., Dolores Doga Harris Jan 2001

An Inquiry Into The Influence Of Taped Books On The Oral Reading Performance Of Struggling Third-Grade Readers., Dolores Doga Harris

LSU Historical Dissertations and Theses

The purpose of the nine-week study was to explore, using taped book intervention, the oral reading fluency of six struggling third-grade readers. The low-income, inner city, African American students were selected using teacher recommendations, standardized test scores, and the school system's Grade Level Indicators of Essential Knowledge---Grade 3 English Language Arts. Procedures used in the study were observing, collecting field notes, reviewing documents, conducting open-ended interviews, prioritizing book selection interests, and making assessments. Pre- and post-intervention assessments included the following: (1) oral reading rate---the Gray Oral Reading Test-3 (GORT-3), two-minute timed readings, and Corduroy benchmark probes; (2) word recognition---Slosson Oral …

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English Immersion Program In Korea: Student Progress After Four Months Of Implementation., Jaiwon Jung Jan 2001

English Immersion Program In Korea: Student Progress After Four Months Of Implementation., Jaiwon Jung

LSU Historical Dissertations and Theses

In Korea, efforts to teach a non-native language, such as English, to Korean students usually result in native speakers acquiring limited language abilities. As a result, the teaching of English has little effect upon making native speakers fluent in a non-native language. Many foreign language instructors in Korea attempt to find new teaching methods to improve the performance of students in foreign language proficiency. Among the various innovative approaches of the 20th century, research has shown that the immersion approach may be one of the most effective means. Thus this dissertation introduces the innovative immersion teaching methods for Korean school …

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Essays On Semiparametric Estimation., Kang-Sun Lee Jan 2001

Essays On Semiparametric Estimation., Kang-Sun Lee

LSU Historical Dissertations and Theses

This dissertation is primary concerned on the study of semiparametric estimation approaches. In the respect of the usage of econometric analysis that is evaluating theoretical relationship, the semiparametric analysis is useful to get the flexibility of functional form. The kernel-type nonparametric methods are used for semiparametric approaches in this dissertation. The first essay focuses upon performance of various bandwidth selectors in the local linear regression method. The results indicate that the variable bandwidth selector is superior to constant bandwidth selector in the more skewed data set or complicated functional form. LSCV bandwidth selector fit well in the simple functional form. …

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The Relationship Between Water Vapor And Hurricane Track Using The Goes-8 Satellite., Melvin Francis Martin Jr Jan 2001

The Relationship Between Water Vapor And Hurricane Track Using The Goes-8 Satellite., Melvin Francis Martin Jr

LSU Historical Dissertations and Theses

Hurricanes are one of nature's most destructive forces. Hurricane intensity, track, and speed of motion are possibly the most important features to forecast in order to reduce the risk to life and property. This research uses the Geostationary Operational Environmental Satellite (GOES) water vapor channel to investigate the relationship between water vapor and hurricane track. GOES 8 satellite data was collected at the Louisiana State University Earth Scan Laboratory for 30 Atlantic Basin tropical cyclones for the 1998, 1999, and 2000 hurricane seasons. GOES 8 water vapor channel radiance temperatures were smoothed and contoured at 1°Celsius intervals to display a …

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Systematics Of Neotropical Satyrine Butterflies (Nymphalidae: Satyrinae: Euptychiina) Based On Larval Morphology And Dna Sequence Data And The Evolution Of Life History Traits., Debra Lynne Murray Jan 2001

Systematics Of Neotropical Satyrine Butterflies (Nymphalidae: Satyrinae: Euptychiina) Based On Larval Morphology And Dna Sequence Data And The Evolution Of Life History Traits., Debra Lynne Murray

LSU Historical Dissertations and Theses

Although satyrine butterflies (Lepidoptera: Nymphalidae: Satyrinae) are highly diverse and found worldwide in most terrestrial habitats, they have received little attention from systematists. This research focuses on one of the largest satyrine groups, the euptychiines, found from central United States to Argentina, with the greatest diversity in the Amazon. The subtribe Euptychiina has a troubled taxonomic history. Most genera were erected without diagnoses and placed within the subtribe without being examined. Before this project was initiated, little was known of their basic biology and morphology. Therefore, considerable attention was given to this area in my research. I describe the larvae …

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Ways Of Incorporating Photographic Images In Learning And Assessing High School Biology: A Study Of Visual Perception And Visual Cognition., Brenda Chaumont Nixon Jan 2001

Ways Of Incorporating Photographic Images In Learning And Assessing High School Biology: A Study Of Visual Perception And Visual Cognition., Brenda Chaumont Nixon

LSU Historical Dissertations and Theses

This study evaluated the cognitive benefits and costs of incorporating biology-textbook and student-generated photographic images into the learning and assessment processes within a 10th grade biology classroom. The study implemented Wandersee's (2000) 20-Q Model of Image-Based Biology Test-Item Design (20-Q Model) to explore the use of photographic images to assess students' understanding of complex biological processes. A thorough review of the students' textbook using ScaleMaster R with PC Interface was also conducted. The photographs, diagrams, and other representations found in the textbook were measured to determine the percentage of each graphic depicted in the book and comparisons were made to …

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A Dynamic Econometric Model For The United States Rice Market., Sung Chul No Jan 2001

A Dynamic Econometric Model For The United States Rice Market., Sung Chul No

LSU Historical Dissertations and Theses

Over the past two decades, developments in time series analysis have brought new approaches for combining structural characteristics of market models with stochastic processes that better represent available data. One line of research is the works of Zellner and Palm, which is known as structural econometric and time series analysis (SEMTSA). The other approach is the structural vector autoregressive model (SVAR), which is an economic-theory enhancement to the standard VAR approach. Empirical evaluations of how well these approaches may work in explaining the dynamics of commodity markets are lacking. The current study provides an empirical evaluation of these two approaches …

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Measurement Of Bottom Quark Production In Two -Photon Collisions., Sepehr Saremi Jan 2001

Measurement Of Bottom Quark Production In Two -Photon Collisions., Sepehr Saremi

LSU Historical Dissertations and Theses

The cross section for bottom quark production in two-photon collisions, sigma( e+e- → e+e- bb¯X), is measured for the first time. The measurement is performed with the L3 detector at the Large Electron Positron (LEP) collider at the European Center for Nuclear and Particle Physics (CERN). The data corresponds to 410 pb-1 taken at center-of-mass energies from 189 GeV to 202 GeV. Hadrons containing a bottom quark are identified by detecting electrons or muons from their semi-leptonic decays. The measured cross section is in excess of the Next to Leading Order QCD prediction by a factor of three.

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Physicochemical, Functional And Spectroscopic Analysis Of Crawfish Chitin And Chitosan As Affected By Process Modification., Sandeep Kumar Rout Jan 2001

Physicochemical, Functional And Spectroscopic Analysis Of Crawfish Chitin And Chitosan As Affected By Process Modification., Sandeep Kumar Rout

LSU Historical Dissertations and Theses

Traditional isolation of chitin from crawfish shells involves three sequential steps: demineralization (DM, removing calcium carbonate/phosphate), deproteinization (DP), and decolorization (DC, removing mainly astaxanthin). The first two steps can be reversed (i.e., DMP or DPM). Chitin is converted to chitosan by deacetylation (DA). Isolation steps may be shortened, depending on intended applications of chitosan. The first study investigated effects of (1) reversing sequence and (2) eliminating DP and DC steps on physicochemical and functional properties of chitosan and conversion efficiency of chitin. Twelve different processes: DM, DP, DPM, DMP, DPMC, DMPC, DMA, DMCA, DPMA, DMPA, DPMCA, DMPCA were investigated. DA …

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The Call From The Stranger On A Journey Home: Curriculum As Creative Transformation Of Selfhood., Hongyu Wang Jan 2001

The Call From The Stranger On A Journey Home: Curriculum As Creative Transformation Of Selfhood., Hongyu Wang

LSU Historical Dissertations and Theses

Both utilizing and problematizing the notions of stranger, home, journey, and self through cross-cultural inquiry, gender analysis, psychoanalysis, and autobiography, this study attempts to draw a new picture of the human self and a new vision of curriculum. It draws upon the works of three great thinkers: Michel Foucault, a French philosopher; Confucius, an ancient Chinese sage; and Julia Kristeva, a French psychoanalyst. Traveling through a contradictory yet generative space provided by the Foucaultian subject, the Confucian self, and the Kristevian subject, this study intends to address the issues of differences, connections, and creativity in depicting a new landscape of …

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Louisiana Agriculture Winter, 2001, Lsu Agcenter Jan 2001

Louisiana Agriculture Winter, 2001, Lsu Agcenter

Louisiana Agriculture

No abstract provided.

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Fermi-Surface Measurements On The Low-Carrier Density Ferromagnet (Formula Presented) And (Formula Presented), Donavan Hall, D. P. Young, Z. Fisk, T. P. Murphy, E. C. Palm, A. Teklu, R. G. Goodrich Jan 2001

Fermi-Surface Measurements On The Low-Carrier Density Ferromagnet (Formula Presented) And (Formula Presented), Donavan Hall, D. P. Young, Z. Fisk, T. P. Murphy, E. C. Palm, A. Teklu, R. G. Goodrich

Faculty Publications

Recently it has been discovered that weak ferromagnetism of a dilute three-dimensional electron gas develops on the energy scale of the Fermi temperature in some of the hexaborides; that is, the Curie temperature approximately equals the Fermi temperature. We report the results of de Haas–van Alphen experiments on two concentrations of La-doped (formula presented) as well as Ca-deficient (formula presented) and Sr-deficient (formula presented) The results show that a Fermi surface exists in each case and that there are significant electron-electron interactions in the low-density electron gas. © 2001 The American Physical Society.

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Kondo Effect To Heavy Fermions Studied Using The De Haas-Van Alphen Effect, N. Harrison, R. G. Goodrich, A. Teklu, L. Balicas, J. S. Brooks, D. Young, Z. Fisk, J. C. Cooley, J. L. Smith Jan 2001

Kondo Effect To Heavy Fermions Studied Using The De Haas-Van Alphen Effect, N. Harrison, R. G. Goodrich, A. Teklu, L. Balicas, J. S. Brooks, D. Young, Z. Fisk, J. C. Cooley, J. L. Smith

Faculty Publications

In this paper, we briefly review some recent de Haas-van Alphen experiments on two contrasting types of heavy fermion/Kondo systems for varying concentrations x of the impurity ion, Ce or U. In both systems the Fermi surface is observed to vary continuously with x: in CexLa1-xB6, the Ce ions behave as Kondo impurities while in UxTh1-xBe13 they do not. In both systems, the f electrons are also found to contribute only partially to the Fermi surface volume, therefore raising questions concerning the applicability of Fermi liquid theory.

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Magnetic Polarons And The Metal-Semiconductor Transitions In (Formula Presented) And Euo: Raman Scattering Studies, C. S. Snow, S. L. Cooper, D. P. Young, Z. Fisk, Arnaud Comment, Jean Philippe Ansermet Jan 2001

Magnetic Polarons And The Metal-Semiconductor Transitions In (Formula Presented) And Euo: Raman Scattering Studies, C. S. Snow, S. L. Cooper, D. P. Young, Z. Fisk, Arnaud Comment, Jean Philippe Ansermet

Faculty Publications

We present inelastic light scattering measurements of EuO and (formula presented) (formula presented) 0.005, 0.01, 0.03, and 0.05) as functions of doping, B isotope, magnetic field, and temperature. Our results reveal a variety of distinct regimes as a function of decreasing T: (a) a paramagnetic semimetal regime, which is characterized by a collision-dominated electronic scattering response whose scattering rate (formula presented) decreases with decreasing temperature; (b) a spin-disorder scattering regime, which is characterized by a collision-dominated electronic scattering response whose scattering rate (formula presented) scales with the magnetic susceptibility; (c) a magnetic polaron regime, in which the development of an …

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Influence Of Variety On Wheat Yield Performance And Maturity (Research Report #113), H. J. Mascagni Jr., Steve Harrison Jan 2001

Influence Of Variety On Wheat Yield Performance And Maturity (Research Report #113), H. J. Mascagni Jr., Steve Harrison

LSU AgCenter Research Reports

Wheat, a cool-season crop, is often used in double-cropping systems. The objective of this research was to evaluate yield performance and dates of maturity for wheat varieties with a wide range of maturity.

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Measurement Of Electron-Neutrino Electron Elastic Scattering, L. B. Auerbach, R. L. Burman, D. O. Caldwell, E. D. Church, J. B. Donahue, A. Fazely, G. T. Garvey, R. M. Gunasingha, R. Imlay, W. C. Louis, R. Majkic, A. Malik, W. Metcalf, G. B. Mills, V. Sandberg, D. Smith, I. Stancu, M. Sung, R. Tayloe, G. J. Vandalen, W. Vemon, N. Wadia, D. H. White, S. Yellin Jan 2001

Measurement Of Electron-Neutrino Electron Elastic Scattering, L. B. Auerbach, R. L. Burman, D. O. Caldwell, E. D. Church, J. B. Donahue, A. Fazely, G. T. Garvey, R. M. Gunasingha, R. Imlay, W. C. Louis, R. Majkic, A. Malik, W. Metcalf, G. B. Mills, V. Sandberg, D. Smith, I. Stancu, M. Sung, R. Tayloe, G. J. Vandalen, W. Vemon, N. Wadia, D. H. White, S. Yellin

Faculty Publications

The cross section for the elastic scattering reaction νe+e-→νe+e- was measured by the Liquid Scintillator Neutrino Detector using a μ+ decay-at-rest νe beam at the Los Alamos Neutron Science Center. The standard model of electroweak physics predicts a large destructive interference between the charge current and neutral current channels for this reaction. The measured cross section, σνe+e-= [10.1± 1.1(stat) ±1.0(syst)]×Eνe (MeV)× 10-45 cm2, agrees well with standard model expectations. The measured value of the interference parameter, I= -1.01±0.13(stat)±0.12(syst), is in good agreement with the standard model expectation of ISM= -1.09. Limits are placed on neutrino flavor-changing neutral currents. An upper …

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Measurement Of Electron-Neutrino Electron Elastic Scattering, L. B. Auerbach, R. L. Burman, D. O. Caldwell, E. D. Church, J. B. Donahue, A. Fazely, G. T. Garvey, R. M. Gunasingha, R. Imlay, W. C. Louis, R. Majkic, A. Malik, W. Metcalf, G. B. Mills, V. Sandberg, D. Smith, I. Stancu, M. Sung, R. Tayloe, G. J. Vandalen, W. Vernon, N. Wadia, D. H. White, S. Yellin Jan 2001

Measurement Of Electron-Neutrino Electron Elastic Scattering, L. B. Auerbach, R. L. Burman, D. O. Caldwell, E. D. Church, J. B. Donahue, A. Fazely, G. T. Garvey, R. M. Gunasingha, R. Imlay, W. C. Louis, R. Majkic, A. Malik, W. Metcalf, G. B. Mills, V. Sandberg, D. Smith, I. Stancu, M. Sung, R. Tayloe, G. J. Vandalen, W. Vernon, N. Wadia, D. H. White, S. Yellin

Faculty Publications

The cross section for the elastic scattering reaction (Formula presented) was measured by the Liquid Scintillator Neutrino Detector using a (Formula presented) decay-at-rest (Formula presented) beam at the Los Alamos Neutron Science Center. The standard model of electroweak physics predicts a large destructive interference between the charge current and neutral current channels for this reaction. The measured cross section, (Formula presented) agrees well with standard model expectations. The measured value of the interference parameter, (Formula presented) is in good agreement with the standard model expectation of (Formula presented) Limits are placed on neutrino flavor-changing neutral currents. An upper limit on …

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Measurements Of Charged Current Reactions Of Ve On 12C, L. B. Auerbach, R. L. Burman, D. O. Caldwell, E. D. Church, J. B. Donahue, A. Fazely, G. T. Garvey, R. M. Gunasingha, R. Imlay, W. C. Louis, R. Majkic, A. Malik, W. Metcalf, G. B. Mills, V. Sandberg, D. Smith, I. Stancu, M. Sung, R. Tayloe, G. J. Vandalen, W. Vernon, N. Wadia, D. H. White, S. Yellin Jan 2001

Measurements Of Charged Current Reactions Of Ve On 12C, L. B. Auerbach, R. L. Burman, D. O. Caldwell, E. D. Church, J. B. Donahue, A. Fazely, G. T. Garvey, R. M. Gunasingha, R. Imlay, W. C. Louis, R. Majkic, A. Malik, W. Metcalf, G. B. Mills, V. Sandberg, D. Smith, I. Stancu, M. Sung, R. Tayloe, G. J. Vandalen, W. Vernon, N. Wadia, D. H. White, S. Yellin

Faculty Publications

Charged current reactions of ve on 12C have been studied using a μ+ decay-at-rest ve beam at the Los Alamos Neutron Science Center. The cross section for the exclusive reaction 12C(ve,e-)12Ng.s. was measured to be (8.9 ± 0.3 ± 0.9) × 10-42 cm2. The observed energy dependence of the cross section and angular distribution of the outgoing electron agree well with theoretical expectations. Measurements are also presented for inclusive transitions to 12N excited states, 12C(ve ,e-)12N* and compared with theoretical expectations. The measured cross section, (4.3 ± 0.4 ± 0.6) × 10-42 cm2, is somewhat lower than previous measurements and …

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Evidence For Neutrino Oscillations From The Observation Of [Formula Presented] Appearance In A [Formula Presented] Beam, A. Aguilar, L. B. Auerbach, R. L. Burman, D. O. Caldwell, E. D. Church, A. K. Cochran, J. B. Donahue, A. Fazely, G. T. Garvey, R. M. Gunasingha, R. Imlay, W. C. Louis, R. Majkic, A. Malik, W. Metcalf, G. B. Mills, V. Sandberg, D. Smith, I. Stancu, M. Sung, R. Tayloe, G. J. Vandalen, W. Vernon, N. Wadia, D. H. White, S. Yellin Jan 2001

Evidence For Neutrino Oscillations From The Observation Of [Formula Presented] Appearance In A [Formula Presented] Beam, A. Aguilar, L. B. Auerbach, R. L. Burman, D. O. Caldwell, E. D. Church, A. K. Cochran, J. B. Donahue, A. Fazely, G. T. Garvey, R. M. Gunasingha, R. Imlay, W. C. Louis, R. Majkic, A. Malik, W. Metcalf, G. B. Mills, V. Sandberg, D. Smith, I. Stancu, M. Sung, R. Tayloe, G. J. Vandalen, W. Vernon, N. Wadia, D. H. White, S. Yellin

Faculty Publications

A search for (Formula presented) oscillations was conducted by the Liquid Scintillator Neutrino Detector at the Los Alamos Neutron Science Center using (Formula presented) from (Formula presented) decay at rest. A total excess of (Formula presented) events consistent with (Formula presented) scattering was observed above the expected background. This excess corresponds to an oscillation probability of (Formula presented) which is consistent with an earlier analysis. In conjunction with other known limits on neutrino oscillations, the LSND data suggest that neutrino oscillations occur in the (Formula presented) range, indicating a neutrino mass greater than (Formula presented) © 2001 The American Physical …

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Thermodynamics Of D-Wave Superconductors In A Magnetic Field, I. Vekhter, P. J. Hirschfeld, E. J. Nicol Jan 2001

Thermodynamics Of D-Wave Superconductors In A Magnetic Field, I. Vekhter, P. J. Hirschfeld, E. J. Nicol

Faculty Publications

We investigate the thermodynamic properties of a two-dimensional d-wave superconductor in the vortex state using a semiclassical approach, and argue that such an approach is valid for the analysis of the experimental data on high-temperature superconductors. We develop a formalism where the spatial average of a physical quantity is written as an integral over the probability density of the Doppler shift, and evaluate this probability density for several model cases. The approach is then used to analyze the behavior of the specific heat and the nuclear magnetic resonance (NMR) spin-lattice relaxation rate in a magnetic field. We compare our results …

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Time-Frequency Representations Of High Order Harmonics, Mette B. Gaarde Jan 2001

Time-Frequency Representations Of High Order Harmonics, Mette B. Gaarde

Faculty Publications

We calculate time-frequency representations (TFRs) of high-order short pulse harmonics generated in the interaction between neon atoms and an intense laser field, including macroscopic effects of propagation and phase matching in the non-linear medium. The phase structure of the harmonics is often complicated and the TFR can help to resolve the different components of this structure. The harmonic pulses exhibit an overall negative chirp, which can be attributed in part to the intensity dependence of the harmonic dipole phase. In some cases, the harmonic field separates in the time-frequency domain and clearly exhibits two different chirps. We also compute an …

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Polymer Processing In Microgravity: An Overview, James Patton Downey, John A. Pojman Jan 2001

Polymer Processing In Microgravity: An Overview, James Patton Downey, John A. Pojman

Faculty Publications

Understanding how polymer processing can be different in microgravity requires an understanding of how gravity can affect polymer reactions and processes. We review here the fundamentals of buoyancy-driven (Rayleigh-Bénard) and surface-tension driven (Marangoni) convection. We consider the polymer processes that are affected by convection and review polymer experiments that demonstrate convective effects in 1 g and microgravity.

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Phylogeny Of The Celastraceae Inferred From Phytochrome B Gene Sequence And Morphology, Mark P. Simmons, Curtis C. Clevinger, Vincent Savolainen, Robert H. Archer, Sarah Mathews, Jeff J. Doyle Jan 2001

Phylogeny Of The Celastraceae Inferred From Phytochrome B Gene Sequence And Morphology, Mark P. Simmons, Curtis C. Clevinger, Vincent Savolainen, Robert H. Archer, Sarah Mathews, Jeff J. Doyle

Faculty Publications

Phylogenetic relationships within Celastraceae were inferred using a simultaneous analysis of 61 morphological characters and 1123 base pairs of phytochrome B exon 1 from the nuclear genome. No gaps were interred, and the gene tree topology suggests that the primers were specific to a single locus that did not duplicate among the lineages sampled. This region of phytochrome B was most useful for examining relationships among closely related genera. Fifty-one species from 38 genera of Celastraceae were sampled. The Celastraceae sensu lato (including Hippocrateaceae) were resolved as a monophyletic group. Loesener's subfamilies and tribes of Celastraceae were not supported. The …

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