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1999

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Interaction Between Karst, Water And Agriculture Over The Climatic Gradient Of Israel, Amos Frumkin Jan 1999

Interaction Between Karst, Water And Agriculture Over The Climatic Gradient Of Israel, Amos Frumkin

International Journal of Speleology

The dry climate of Israel and the karstic nature of its rocks have always imposed human innovation for utilisation of water resources and agriculture. Large perennial karst springs are available only in the lowlands, but sophisticated water supply systems were built both in the lowland and highland regions. Marl layers interbedded within carbonates give rise to local perched springs and allow terrace construction. Deforestation has taken place for some 4000 years, causing intense soil erosion, but terraces have reduced this impact.

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Agricultural Use And Water Quality At Karstic Cuban Western Plain, Juan Reynerio Fagundo Castillo, Patricia González Hernandez Jan 1999

Agricultural Use And Water Quality At Karstic Cuban Western Plain, Juan Reynerio Fagundo Castillo, Patricia González Hernandez

International Journal of Speleology

In the paper some results of studies on the karstic aquifers of the western plain of Cuba are presented and discussed. The intensive exploitation of these aquifers for agriculture use and drinking water supply induces an increase of marine water intrusion, water salinisation and a progressive increase of chemical corrosion with a greater dissolution of carbonates. During the period of study (1983-1998) a trend in the deterioration of water quality was observed by means of a chronological series of hydrochloride content.

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Unusual Behavior From A Red-Bellied Woodpecker: Infanticide, Brood Reduction, Or Interspecific Competition?, Eric F. Zuelke Jan 1999

Unusual Behavior From A Red-Bellied Woodpecker: Infanticide, Brood Reduction, Or Interspecific Competition?, Eric F. Zuelke

Delaware Ornithologist

No abstract provided.

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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 …

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Sediment And Particulate Organic Carbon Transport Dynamics In The Barataria Basin, Louisiana., John Gregory Booth Jan 1999

Sediment And Particulate Organic Carbon Transport Dynamics In The Barataria Basin, Louisiana., John Gregory Booth

LSU Historical Dissertations and Theses

The transport of sediment and particulate organic carbon (POC) in the Barataria Basin was examined using techniques from the fields of geochemistry, remote sensing and environmental modeling. Monthly (deposition) and decadal (burial) rates of sediment and POC transport were quantified from bottom sediment samples. Sediment and POC deposition rates, based on 7Be inventories, ranged from -1.6E3 to 1.42E4 g m-2 yr-1 and 122 to 1066 g C m-2 yr-1, respectively. Sediment and POC burial rates, based on excess 210Pb down-core distributions, ranged from 3.8E2 to 2.0E3 g m-2 yr-1 and 27 to 37 g C in 2 yr-1, respectively. Deposition …

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High School Biology Students' Participation In A Year-Long Sequence Of Analogical Activities: The Relationship Of Development Of Analogical Thought To Student Learning And Classroom Interactions., Marcella Wichser Hackney Jan 1999

High School Biology Students' Participation In A Year-Long Sequence Of Analogical Activities: The Relationship Of Development Of Analogical Thought To Student Learning And Classroom Interactions., Marcella Wichser Hackney

LSU Historical Dissertations and Theses

This research explored development of analogical thought through high school biology students' participation in a year-long sequence of analogical activities. Analogizing involves: selecting a familiar analog; mapping similarities and differences between the analog and less familiar target; making inferences from the analogy; evaluating validity of the inferences; and ultimately, understanding the biological target (Holyoak & Thagard, 1995). This investigation considered: student development of independence in learning through analogical thought, student learning of biology, the relationship between development of students' analogical thinking and students' learning of biology, and the quality of student interactions in the classroom. This researcher, as teacher participant, …

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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. …

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Design Of Work-Rest Schedules For Vdt Operators., Rana Balci Jan 1999

Design Of Work-Rest Schedules For Vdt Operators., Rana Balci

LSU Historical Dissertations and Theses

The number of musculoskeletal and psychological discomforts is increasing as a result of continuing growth of VDT work. Although ergonomic improvements in workstation design can be applied, an effective work-rest schedule is an economical way to reduce these problems. The objective of this research was to determine an effective work-rest schedule for VDT operators. In addition to a discomfort questionnaire, performance and electromyography measurements from trapezius and flexor carpi radialis were used. Three different work-rest schedules were applied: 60-minute work/10-minute rest, 30-minute work/5-minute rest, and for the third schedule, the subjects received four breaks from VDT work each hour additional …

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Nonaxisymmetric Equilibrium Models For Gaseous Galaxy Disks., Paul Fisher Jan 1999

Nonaxisymmetric Equilibrium Models For Gaseous Galaxy Disks., Paul Fisher

LSU Historical Dissertations and Theses

Three-dimensional hydrodynamic simulations show that, in the absence of self-gravity, an axisymmetric, gaseous galaxy disk whose angular momentum vector is initially tipped at an angle i0 to the symmetry axis of a fixed spheroidal dark matter halo potential does not settle to the equatorial plane of the halo. Instead, the disk settles to a plane that is tipped at an angle a = arctan [ q2 tan i0] to the equatorial plane of the halo, where q is the axis ratio of the halo equipotential surfaces. The equilibrium configuration to which the disk settles appears to be flat but it …

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Barium In Water And Foraminiferal Shells: Indicator Of Oceanographic Conditions In The Gulf Of Mexico Since The Late Pleistocene., Thomas Peter Buerkert Jan 1999

Barium In Water And Foraminiferal Shells: Indicator Of Oceanographic Conditions In The Gulf Of Mexico Since The Late Pleistocene., Thomas Peter Buerkert

LSU Historical Dissertations and Theses

The Gulf of Mexico offers an appropriate setting for studying the chemical dynamics at the continent-ocean interface. In addition, its sediments preserve the climatic records of the past. This study employs Ba as a tracer to examine several aspects of modern Gulf oceanographic processes and seeks to unravel Gulf paleoceanography using Ba/Ca ratios from fossil foraminiferal shells. Comparison of dissolved Ba in the Mississippi and Atchafalaya River mixing zones suggests different Ba distributions can occur as a result of hydrodynamic and morphologic variability. Rapid Ba desorption from suspended material occurs near the Mississippi River, while Ba input from the shallow …

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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 …

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Precursors For Chemical And Photochemical Vapor Deposition Of Copper Metal., Alicia Marie James Jan 1999

Precursors For Chemical And Photochemical Vapor Deposition Of Copper Metal., Alicia Marie James

LSU Historical Dissertations and Theses

The colorless square-planar cluster [CuN(SiMe3)2] 4, which contains four Cu(I) ions with four bridging amide groups, was studied as a precursor for chemical and photochemical vapor deposition of Cu metal. The cluster phosphoresces in CH2Cl2 solution and in the solid state at room temperature. Its electronic spectrum in CH 2Cl2 consists of two intense bands which are assigned to symmetry-allowed 3d → 4p transitions; the phosphorescence is also likely to be metal-centered. Solid [CuN(SiMe3)2]4 luminesces with approximately the same spectrum as that of the CH2Cl2 solutions. At 77 K, the solid-state luminescence red-shifts slightly. The emission lifetime in glassy Et2O …

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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 …

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Interactions On Minerals And Organic Materials Along The Salinity Gradient In Barataria Basin, Louisiana., Jessica Anne Kastler Jan 1999

Interactions On Minerals And Organic Materials Along The Salinity Gradient In Barataria Basin, Louisiana., Jessica Anne Kastler

LSU Historical Dissertations and Theses

Changes in the associations among mineral and organic materials in estuaries may control the nature and quantity of organic material (OM) preserved in sediment deposits or cycled in the water column. Estuarine sediment-OM attachments were examined using descriptive analyses and experiments to assess their response to salinity changes and the bioavailability of sedimentary OM. Desorption experiments compared the amount of organic carbon extracted from sediment in rinses of different salinity. Uptake experiments monitored changes in carbon and bacteria concentrations to compare the bioavailability of dissolved and sedimentary OM. Clay mineralogy, surface area and elemental analysis of suspended and deposited sediment …

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Holding Back The Waters: Land Development And The Origins Of Levees On The Mississippi, 1720-1845., Jeffrey Alan Owens Jan 1999

Holding Back The Waters: Land Development And The Origins Of Levees On The Mississippi, 1720-1845., Jeffrey Alan Owens

LSU Historical Dissertations and Theses

Man's efforts to control flooding on the Mississippi began about 280 years ago, but the first 130 years has been neglected in scholarly literature. In spite of abundant primary sources, most histories of flood control on the Mississippi revolve around hydraulic engineering and the contributions of state and federal levee bureaucracies---factors which had almost no impact on the creation of the levee system. Engineers did install the first levee at New Orleans and levees on their own plantations in the 1720s, but the extension of the levee line thereafter was almost entirely the work of private land developers supervised at …

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How Does Undergraduate College Biology Students' Level Of Understanding, In Regard To The Role Of The Seed Plant Root System, Relate To Their Level Of Understanding Of Photosynthesis?, James Gicheha Njeng'ere Jan 1999

How Does Undergraduate College Biology Students' Level Of Understanding, In Regard To The Role Of The Seed Plant Root System, Relate To Their Level Of Understanding Of Photosynthesis?, James Gicheha Njeng'ere

LSU Historical Dissertations and Theses

This research study investigated how undergraduate college biology students' level of understanding of the role of the seed plant root system relates to their level of understanding of photosynthesis. This research was conducted with 65 undergraduate non-majors biology who had completed 1 year of biology at Louisiana State University in Baton Rouge and Southeastern Louisiana University in Hammond. A root probe instrument was developed from some scientifically acceptable propositional statements about the root system, the process of photosynthesis, as well as the holistic nature of the tree. These were derived from research reviews of the science education and the arboriculture …

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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 …

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Women's Voices In Education: Two Jamaican Life Histories., Ethel L. King-Mckenzie Jan 1999

Women's Voices In Education: Two Jamaican Life Histories., Ethel L. King-Mckenzie

LSU Historical Dissertations and Theses

The main purpose of this study is to recover the marginalized voices of women educators in Jamaica by turning their oral life histories into text. It was not possible to interview all women educators in Jamaica so I have used the life histories of two women who were the 'first' women to take positions in educational leadership in two spheres that were once male dominated. Both women have made it to the zenith of the education profession. These women relate their life experiences and the meanings they give to their work as educators. Women have always played important roles in …

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Effects Of Low-Oxygen Atmosphere On The Growth And Development Of Arabidopsis Thaliana (L.) Heynh., Katrina Maria Ramonell Jan 1999

Effects Of Low-Oxygen Atmosphere On The Growth And Development Of Arabidopsis Thaliana (L.) Heynh., Katrina Maria Ramonell

LSU Historical Dissertations and Theses

Interest in the improvement of crop productivity through repression of photorespiration led to experimental growth of plants in low O2 and the surprising finding that reproduction is inhibited under these conditions. Using Arabidopsis thaliana (L.) Heynh. cv. Columbia, studies were undertaken to understand the mechanism behind oxygen control of plant development. The hypothesis that developmental changes observed in low O 2 are due to repression of the plant hormones ethylene and brassinolide (which require O2 for biosynthesis) was tested. Arabidopsis was grown for 35 days in Sun bags in one of five altered O 2 atmospheres (210, 160, 100, 50, …

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A Description And Analysis Of The Scholarly Response Paper As An Academic Genre: Determining How Linguistic, Social, And Psychological Variables Affect Its Success/Failure And The Professional Credibility Of Its Author., Lynna Dunn Peneguy Jan 1999

A Description And Analysis Of The Scholarly Response Paper As An Academic Genre: Determining How Linguistic, Social, And Psychological Variables Affect Its Success/Failure And The Professional Credibility Of Its Author., Lynna Dunn Peneguy

LSU Historical Dissertations and Theses

The study of various documents and genres within professional discourse communities can provide valuable insight into what does or does not constitute successful written communication within such groups. The primary purpose of the current study was to examine scholarly response papers published in five different "English" journals in order to (1) define and describe the scholarly response paper and (2) explore various theories/rules/studies which could be used to gauge its success: in this case, Grice's Maxims, studies of semantic (denotative and evaluative) verb force, Lakoff's Rules of Politeness, and studies of language intensity. Findings showed that the primary purpose of …

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Behavior Of Bensulfuron-Methyl As Affected By Soil Factors And Rice Management Aspects., Randall Otto Wilde Jan 1999

Behavior Of Bensulfuron-Methyl As Affected By Soil Factors And Rice Management Aspects., Randall Otto Wilde

LSU Historical Dissertations and Theses

Multi-source regression models describing the control of alligatorweed with bensulfuron-methyl as influenced by rate and temperature were developed under field conditions. Temperature models describing the activity of bensulfuron-methyl at 21 to 84 g ai/ha on alligatorweed were linear 7 days after treatment (DAT) and quadratic 14 and 28 DAT. At 7 and 14 DAT, a minimum average temperature of 14 C was required for bensulfuron-methyl activity on alligatorweed. The temperatures for optimal alligatorweed control with bensulfuron-methyl at 14 DAT ranged from 21 to 24 C with rates of 21 to 84 g/ha. Temperatures for optimal alligatorweed control with bensulfuron-methyl at …

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Spatial Modeling Of Coastal Landscapes: Methodological And Scientific Applications., Mary Louise White Jan 1999

Spatial Modeling Of Coastal Landscapes: Methodological And Scientific Applications., Mary Louise White

LSU Historical Dissertations and Theses

A number of issues related to landscape scale ecological modeling of the wetlands of southern Louisiana are examined in this study. First, using geostatistical methods, a new contour map of the wetland habitats in the Terrebonne basin of southern Louisiana is constructed from data collected in 1994. This map is proposed as the best field verified habitat map of the Terrebonne basin and contains statistical confidence intervals associated with the habitat contours. Second, the problem of how to evaluate the success of a landscape model prediction is investigated. The multiple resolution goodness of fit parameter Ft(k) is evaluated in detail …

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Spectrum Of Solar Neutrinos Above 6.5 Mev., Robert Ellis Sanford Jr Jan 1999

Spectrum Of Solar Neutrinos Above 6.5 Mev., Robert Ellis Sanford Jr

LSU Historical Dissertations and Theses

The spectrum of recoil electrons from solar neutrino scattering above 6.5 MeV has been measured using the first 504 days of Super-Kamiokande detector data. The scattering rate is found to be 13.56 +/- 0.42(stat. ) +/- 0.29(syst.) events/day/22.5kton, which is a factor of 0.474 +/- 0.015(stat.) +/- 0.010( syst.) of the expected rate. The measured spectrum and the expected spectra from 8B and HeP Neutrino scattering are compared using a chi2 minimization process to find the best-fit match between the measured neutrino rates and a linear combination of the expected rates from 8B and HeP neutrinos. Using only the 8B …

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Life Events, Social Support, And Blood Pressure Control In Low -Income Hypertensive Patients., Steven Christopher Ames Jan 1999

Life Events, Social Support, And Blood Pressure Control In Low -Income Hypertensive Patients., Steven Christopher Ames

LSU Historical Dissertations and Theses

This study examined whether minor, chronic, and major stressors predicted poor blood pressure control in low-income hypertensives, and whether social support served as a moderator of this relation. Additionally, whether the construct of social support served as an independent predictor of poor blood pressure control was also examined. Participants included 231 patients randomly recruited from primary care medicine clinics at a public medical center. The sample included in this study was selected from an existing data set. The existing data set consisted of 432 patients randomly chosen on consecutive days from a family practice and an internal medicine medical clinic …

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Parameter Estimation For The Finite Fourier Distribution In Civil Engineering Application., Ching-Nien Tsai Jan 1999

Parameter Estimation For The Finite Fourier Distribution In Civil Engineering Application., Ching-Nien Tsai

LSU Historical Dissertations and Theses

A solution to a one dimensional diffusion equation applicable to a finite interval was adapted to be a probability distribution function. This distribution function can accommodate various shapes of distribution such as those similar to the uniform, single-modal, and bi-modal distributions. This distribution is bounded at both boundaries. It was named the finite Fourier distribution (FFD) to recognize the form of the distribution. The FFD was extended to include a linear combination of the FFD termed two-component FFD. Monte Carlo simulation technique was used to evaluate four parameter estimation techniques, Method of Maximum Likelihood Estimator (MLE), Method of Moments (MOM), …

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The Laser Optogalvanic Effect In Radio Frequency Plasma: Applications In Analytical Chemistry., Xuan Yao Jan 1999

The Laser Optogalvanic Effect In Radio Frequency Plasma: Applications In Analytical Chemistry., Xuan Yao

LSU Historical Dissertations and Theses

The laser optogalvanic effect (LOGE) is the change of electrical impedance of a plasma produced by resonant absorption of laser radiation. Selected excitations can be used to detect specific species by tuning the laser to an appropriate wavelength. For optimum utilization of LOGE as a detection tool, one must understand the temporal profile of the LOGE signal in terms of the various processes occurring in the plasma. In this work, the characteristics of the LOGE signal and the potential applications of laser optogalvanic spectroscopy (LOGS) have been investigated. First, by analyzing the LOGE signal profiles of the neon excitations 1s2,4→2p1,3, …

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Apples And Regional Change: Life And Economy In Tsugaru, Japan., Ann D. Brucklacher Jan 1999

Apples And Regional Change: Life And Economy In Tsugaru, Japan., Ann D. Brucklacher

LSU Historical Dissertations and Theses

In this dissertation, I examine aspects of Japan's rural and agricultural restructuring using Aomori Prefecture's apple industry as a focal point. Though using multiple spatial scales, I concentrate most on changes in agriculture and economy in the Tsugaru region, Aomori's main apple-growing region. A historical overview of Tsugaru and its apple industry provides the background necessary for understanding today's circumstances. Archival and ethnographic methods examine modern-day changes and document the views of individual farmers and their families. Located at the northwestern-most tip of Japan's main island, the Tsugaru region was historically one of Japan's most remote and impoverished regions. The …

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On The Numerical Solution Of The Cylindrical Poisson Equation For Isolated Self -Gravitating Systems., Howard Saul Cohl Jan 1999

On The Numerical Solution Of The Cylindrical Poisson Equation For Isolated Self -Gravitating Systems., Howard Saul Cohl

LSU Historical Dissertations and Theses

This dissertation addresses the need for an accurate and efficient technique which solves the Poisson equation for arbitrarily complex, isolated, self-gravitating fluid systems. Generally speaking, a potential solver is composed of two distinct pieces: a boundary solver and an interior solver. The boundary solver computes the potential, phi(xB) on a surface which bounds some finite volume of space, V, and contains an isolated mass-density distribution, rho(x). Given rho(x) and phi(xB), the interior solver computes the potential phi(x) everywhere within V. Herein, we describe the development of a numerical technique which efficiently solves Poisson's equation in cylindrical coordinates on massively parallel …

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The Formation Of Short Period Binary Star Systems From Stable, Self-Gravitating, Gaseous Bars., John E. Cazes Jr Jan 1999

The Formation Of Short Period Binary Star Systems From Stable, Self-Gravitating, Gaseous Bars., John E. Cazes Jr

LSU Historical Dissertations and Theses

Although we have a general understanding of how stars form, and there. are accepted theories that explain the formation of long-period binaries, we do not yet understand how short period binaries form. Here we present simulations that clearly demonstrate how such systems may form naturally from dense interstellar gas clouds. First, we present two models of compressible, self-gravitating fluid configurations with bar-like structures and supersonic internal motions. Both models have been constructed via dynamical simulations that have started from initially axisymmetric, rapidly rotating polytropes that were known to be dynamically unstable toward the development of a bar-like or two-armed spiral …

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The Role Of Trait And State Anxiety In Semantic Network Organization Of Information Related To Current Concerns., Gretchen Joan Diefenbach Jan 1999

The Role Of Trait And State Anxiety In Semantic Network Organization Of Information Related To Current Concerns., Gretchen Joan Diefenbach

LSU Historical Dissertations and Theses

In the first study of this report empirically-derived cognitive networks were established for high trait test anxious participants ( n = 28) and low trait test anxious participants (n = 25) during periods of both high and low exam stress. Cognitive networks were created using the Pathfinder algorithm, which transforms pair-wise word similarity ratings into an associative network. Information included in the networks pertained to the following word categories: testing situations, positive performance evaluation, and negative performance evaluation. Contrary to predictions, there was no effect of either trait or state test anxiety on semantic network organization. These findings fail to …

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