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Factors Affecting Asulam Activity On Sugarcane (Saccharum Sp.) Cultivars And Johnsongrass (Sorghum Halepense)., Stacey Alan Bruff Jan 1994

Factors Affecting Asulam Activity On Sugarcane (Saccharum Sp.) Cultivars And Johnsongrass (Sorghum Halepense)., Stacey Alan Bruff

LSU Historical Dissertations and Theses

Studies were conducted to evaluate several factors that may account for the variability in johnsongrass (Sorghum halepense (L.) Pers.) control and sugarcane (Saccharum sp.) cultivar sensitivity observed with postemergence application of asulam, methyl ((4-aminophenyl)sulfonyl) carbamate, herbicide. Johnsongrass at boot stage to 70% seedhead emergence was exposed to simulated rainfall (1.3 cm of water in 15 min) 0, 3, 6, 12, 24, and 48 h after application of asulam at 3.7 kg/ha. Predicted critical rainfree period at which greatest johnsongrass control (65 to 80%) was obtained ranged from 8 to 20 h after treatment, dependent on johnsongrass growth stage and environmental …

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Personal And Occupational Mobility Characteristics Of Selected Dislocated Newspaper Workers., Jackie Lamar Benton Jan 1994

Personal And Occupational Mobility Characteristics Of Selected Dislocated Newspaper Workers., Jackie Lamar Benton

LSU Historical Dissertations and Theses

The purpose of this study was to describe the personal and occupational mobility characteristics of selected dislocated newspaper workers and the residual effect of their separation and unemployment. Objectives of the descriptive study focused on: (a) demographic characteristics, (b) employment history, (c) occupational mobility, (d) economic and emotional impact, (e) attitudes and perceptions, and (f) education and training. A defined population of 132 dislocated newspaper workers was surveyed six and 18 months after departure from the industry. The researcher-designed survey instrument had 41 items (six months) and 43 items (18 months). Sixty-four dislocated newspaper workers responded at six months, and …

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Second Order Neural Networks., Sanjoy Das Jan 1994

Second Order Neural Networks., Sanjoy Das

LSU Historical Dissertations and Theses

In this dissertation, a feedback neural network model has been proposed. This network uses a second order method of convergence based on the Newton-Raphson method. This neural network has both discrete as well as continuous versions. When used as an associative memory, the proposed model has been called the polynomial neural network (PNN). The memories of this network can be located anywhere in an n dimensional space rather than being confined to the corners of the latter. A method for storing memories has been proposed. This is a single step method unlike the currently known computationally intensive iterative methods. An …

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Neogene Extension And Regional Rotation Of The Central Mojave Desert, California., Timothy Michael Ross Jan 1994

Neogene Extension And Regional Rotation Of The Central Mojave Desert, California., Timothy Michael Ross

LSU Historical Dissertations and Theses

The southwest Cady Mountains of San Bernardino County, California, contain key relationships which allow separation of the timing of early Miocene detachment-style extension and vertical-axis clockwise rotation in the Mojave Desert. The rock succession consists of a pre-Tertiary granitic basement overlain by three successive volcanic and volcaniclastic units of early to middle Miocene age referred to informally as the formation of Poe, the formation of Troy Peak and the "Barstow Formation". Deposition of the volcanic upper Oligocene/lower Miocene formation of Poe was accompanied by extension and tilting, facilitated by faults which do not cut the unconformably overlying formation of Troy …

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Agricultural Terracing In The Fiji Islands. (Volumes I And Ii)., Robert Thomas Kuhlken Jan 1994

Agricultural Terracing In The Fiji Islands. (Volumes I And Ii)., Robert Thomas Kuhlken

LSU Historical Dissertations and Theses

Agricultural terraces form a distinctive element in the cultural landscape of Fiji. These skillfully fashioned earthworks were developed for the irrigated cultivation of one specific cultigen--taro (Colocasia esculenta), a long domesticated edible aroid. Constructing pondfields on slopes represents an intensification of production, with taro yields responding favorably to higher levels of labor input. In Fiji, irrigated terraces on the leeward side of larger islands also served to overcome seasonal conditions of drought or soil moisture deficits. Nearly all of these intensive agrosystems have been abandoned. But the carefully sculpted hillsides endure, and serve as poignant reminders of past travail. Taro …

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Use Of Uncertainty Methodology In Identification And Classification Of Soils Based Upon Cpt., Zhongjie Zhang Jan 1994

Use Of Uncertainty Methodology In Identification And Classification Of Soils Based Upon Cpt., Zhongjie Zhang

LSU Historical Dissertations and Theses

The current Cone Penetration Test (CPT) soil engineering classifications have two kinds of uncertainties: randomness and fuzziness. Research indicates that possible solutions to these uncertainties can only be worked out through modeling them. Therefore, a systematic investigation is performed and some preparative tasks are done in advance. First, an efficient soil classification index, U, is defined and several CPT soil classification charts are simplified accordingly. Second, a moving window approach based upon an Intraclass Correlation Coefficient (ICC) to determine normal soil behavior units is adopted so that a correlation between soil types and soil behavior units can be established. Based …

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New Teacher Attrition: The Case Of Louisiana., Carl Daniel Frantz Jan 1994

New Teacher Attrition: The Case Of Louisiana., Carl Daniel Frantz

LSU Historical Dissertations and Theses

This study explores district public policies and approaches in Louisiana that are likely to be effective in retaining new public classroom teachers. It does this by looking both at reasons for, and solutions to, new teacher attrition. It employs a combination of quantitative and qualitative methodologies. These include quantitative analysis of the teacher attrition experience in Louisiana parish school districts as well as relationships of district, teacher and student variables to new teacher attrition rates. The qualitative analysis uses information from teachers and administrators in one rural and one non rural set of school districts with widely differing new teacher …

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Inference For Unreplicated Factorial And Fractional Factorial Designs., William J. Kasperski Jan 1994

Inference For Unreplicated Factorial And Fractional Factorial Designs., William J. Kasperski

LSU Historical Dissertations and Theses

The ability to determine which factors significantly affect a product or process can help to improve its quality. Usually there are many factors to be considered initially, but a limited amount of time and money, so it is important to screen the numerous factors with a limited number of experimental trials. In this situation, unreplicated factorial and fractional factorial designs are often used, but because these experiments are unreplicated they do not possess a formal estimate of the experimental error variance. Several methods have been proposed by Daniel, Box and Meyer, Benski, Lenth, and Schneider, Kasperski, and Weissfeld to determine …

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Modeling Of Vdt Workstation System Risk Factors., Hongzheng Lu Jan 1994

Modeling Of Vdt Workstation System Risk Factors., Hongzheng Lu

LSU Historical Dissertations and Theses

The objectives of this research were to determine the most important risk factors in VDT workstations associated with physical symptoms and to investigate the interrelationship among these risk factors. A conceptual model was first developed to describe the interrelationship among the basic components in a VDT workstation system and their possible health effects. A research model was then proposed to describe the hypothesized relationships among the following categories of variables: demographic, task, workstation design, work environment, psychosocial factors, work posture, psychological stress, musculoskeletal symptoms, visual symptoms, and general physical symptoms. A method which consisted of a questionnaire, measurement and posture …

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Biochemical Oxygen Demand Removal Reaction Rate Constants In Microbial Rock Plant Filter Treatment Systems., Bhaskar Kura Jan 1994

Biochemical Oxygen Demand Removal Reaction Rate Constants In Microbial Rock Plant Filter Treatment Systems., Bhaskar Kura

LSU Historical Dissertations and Theses

Microbial Rock Plant Filters (MRPFs) are capable of treating municipal wastewaters, particularly for the removal of biochemical oxygen demand (BOD) in an economic manner. There is no consensus on proper design for these treatment systems due to the limited performance data available on these recently developed systems (Reed, 1993). Variability of the BOD removal reaction rate constant is an important observation which has bearing on the design of these systems. Variability of BOD removal reaction rate constant along the filter length was modeled as a function of the variable microbial activity. The microbial activity was estimated using a modified fluorescein …

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Temporal And Synoptic Analyses Of Heavy Rainfall In The Southeastern United States., Barry David Keim Jan 1994

Temporal And Synoptic Analyses Of Heavy Rainfall In The Southeastern United States., Barry David Keim

LSU Historical Dissertations and Theses

The abundance of recent heavy rainstorms in the southeastern United States has raised concerns that excessive rainstorms may be increasing in frequency and magnitude across the region. For this reason, the heavy rainfall climatology was examined to determine whether long-term trends exist within the historic climate record. In addition, the synoptic conditions leading to these events were examined. The synoptic weather patterns that generated storm events over a 75 mm (3 inches) threshold were classified using an all-inclusive manual weather typing system. Heavy rainfall events in the region were generated primarily by frontal weather systems (79 percent) followed by tropical …

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Studies On The Diffusive Transport Of Hydrophobic Organic Chemicals In Bed Sediments., Gregory John Thoma Jan 1994

Studies On The Diffusive Transport Of Hydrophobic Organic Chemicals In Bed Sediments., Gregory John Thoma

LSU Historical Dissertations and Theses

Hydrophobic chemicals have accumulated in sediments for most of the last century as the result of industrial and municipal discharges as well as urban and agricultural runoff to surface waters. Beginning with the Clean Water Act, these pollutant sources have been significantly reduced resulting in the sediments becoming a source of pollutants to the overlying water ecosystem. It is therefore important to determine the rate at which the contaminants associated with the sediment are released to the water. Removal or isolation of sediment-associated contaminants is often desirable. One option for isolation of contaminated sediments from the aquatic ecosystem is capping, …

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Latitudinal Gradients In Temperate And Tropical Seasonal Forests., Martin Francis Quigley Jan 1994

Latitudinal Gradients In Temperate And Tropical Seasonal Forests., Martin Francis Quigley

LSU Historical Dissertations and Theses

In an analysis of latitudinally replicated one hectare samples, nine seasonal forests of the temperate and tropical Americas were found to be very similar in biomass, stratification and patterns of spatial dispersion, regardless of taxonomic composition or relative stem density. Neither basal area nor relative size class distributions of trees differed significantly among latitudes from the equator to 40$\sp\circ$ north. While overall plant density was greater in tropical forests, the numbers and composition within individual strata--shrub layer, subcanopy, canopy, and liana--interacted independently and significantly with latitude. Understory populations were denser and more speciose at middle latitudes, in forests frequently affected …

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Quantitative Models For The Transition To Just-In-Time Purchasing., Pamela Lynne Anders Jan 1994

Quantitative Models For The Transition To Just-In-Time Purchasing., Pamela Lynne Anders

LSU Historical Dissertations and Theses

Purchasing is a critical, external element of the Just-In-time (JIT) production system. JIT purchasing calls for small delivery quantities which arrive on time, with the quality and quantity required. Economic order quantity models which are adjusted for multiple deliveries or consider the cooperation between the purchaser and the supplier have been published in the literature. The JIT philosophy emphasizes both of these elements. We provide a model for single sourcing which incorporates multiple deliveries and cooperation for the case where there is a single reliable supplier. We call this perfect coordination. The transition to JIT, currently occurring in many companies …

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The Production And Characterization Of Alginate Produced By Pseudomonas Syringae., Richard David Ashby Jan 1994

The Production And Characterization Of Alginate Produced By Pseudomonas Syringae., Richard David Ashby

LSU Historical Dissertations and Theses

Alginate has many industrial uses because of its unique colloidal behavior, and its ability to thicken, stabilize, emulsify, suspend, form films, and produce gels. Currently, all commercial alginate comes from brown algae, where it exists naturally as a structural material. Many different types of brown algae produce alginate but it can only be obtained in sufficient quantity and quality from a limited number of species. On the basis of location, at least half of the world's resources of this polymer are potentially at risk due either to political instability or industrial pollution. Bacteria provide a potentially unlimited alternate source for …

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Political Songsters For The Presidential Campaign Of 1860., Cheryl T. Taranto Jan 1994

Political Songsters For The Presidential Campaign Of 1860., Cheryl T. Taranto

LSU Historical Dissertations and Theses

Songsters, collections of song texts usually containing no music, proliferated in the nineteenth century for various purposes. They provided a quick and inexpensive means of disseminating popular song texts, not only for pure musical entertainment, but also for political purposes, such as temperance, abolition, and campaigns for national office. This study explores how texts contained in 1860 presidential campaign songsters were used as a means of getting political messages across, the popular tunes of the time that were used as vehicles for the lyrics, and the role of songsters in the activities leading up to the election. Songsters were produced …

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Theoretical And Experimental Modeling Of Removing Contaminants From Soils By An Electric Field., Akram Nimer Alshawabkeh Jan 1994

Theoretical And Experimental Modeling Of Removing Contaminants From Soils By An Electric Field., Akram Nimer Alshawabkeh

LSU Historical Dissertations and Theses

A mathematical model is formulated for multicomponent transport of reactive species under an electric field. A set on differential and algebraic equations is developed for transport of fluid, charge, and species in a saturated soil under coupled hydraulic, electric, and chemical potential gradients. An iterative scheme is chosen in solution of a system of differential and algebraic equations. Six differential equations and four algebraic equations are used to model transport of $Pb\sp{2+}$, $H\sp+$, $OH\sp-$, $NO3\sp-$, the associated chemical reactions, electric potential and the hydraulic head across the electrodes. Finite Element Method is used in space discretization. Finite difference technique is …

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Permethrin Resistance In The Soybean Looper, Pseudoplusia Includens (Walker): Geographic Variation, Mechanisms, Inheritance, And Host Plant Effects., James Donald Thomas Jr Jan 1994

Permethrin Resistance In The Soybean Looper, Pseudoplusia Includens (Walker): Geographic Variation, Mechanisms, Inheritance, And Host Plant Effects., James Donald Thomas Jr

LSU Historical Dissertations and Theses

Field strains of soybean looper, Pseudoplusia includens (Walker), from Louisiana, Texas, and Puerto Rico were tested for permethrin synergism by piperonyl butoxide (PB) and S,S,S tributylphosphorotrithioate (DEF). Resistance was completely suppressed by 10 $\mu$g PB/larva in strains from Louisiana with 2.7 to 14.1-fold resistance. The Texas strain was 14.8-fold resistant and permethrin toxicity was increased 8.6-fold by PB. The Puerto Rico strain was highly resistant to permethrin (426.6-fold) and PB increased permethrin toxicity only 4.6 and 7.5-fold, respectively, at 10 and 20 $\mu$g/larva. No significant synergism resulted from DEF treatment in any of the strains tested. In field trials, efficacy …

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Promoter Analysis Of A Rice Seed Storage Protein Glutelin Gene And Expression Of Bean 7s Seed Storage Protein Beta-Phaseolin In Transgenic Rice Plants., Zhenwei Zheng Jan 1994

Promoter Analysis Of A Rice Seed Storage Protein Glutelin Gene And Expression Of Bean 7s Seed Storage Protein Beta-Phaseolin In Transgenic Rice Plants., Zhenwei Zheng

LSU Historical Dissertations and Theses

It was demonstrated, using a homologous transgenic rice system, $5\sp\prime$ distal and proximal cis-acting transcriptional regulatory elements were required for developmental control of a rice seed storage protein glutelin (Gt1) gene. The functional importance of proximal elements in the context of the 1.8 kb promoter was demonstrated by single substitution mutations in the TATA box ($-$28/$-$23), AACA motif ($-$73/$-$61), and protein-binding Boxes I ($-$103/$-$86), II ($-$124/$-$110), III ($-$175/$-$158), and IV ($-$200/$-$217). A simultaneous mutation of five protein-binding sites ($-$410/$-$86) essentially eliminated the activity of the 1.8 kb promoter. To understand the function of the $5\sp\prime$ distal cis-acting upstream sequence, eighteen …

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The Studies Of Rigid Pvc Compounds: Morphology, Rheology, And Fusion Mechanism., Cheng-Ho Chen Jan 1994

The Studies Of Rigid Pvc Compounds: Morphology, Rheology, And Fusion Mechanism., Cheng-Ho Chen

LSU Historical Dissertations and Theses

Morphological analyses of PVC, PVC/CPE, and PVC/CPE/OPE compounds were examined by scanning electron microscopy, transmission electron microscopy, and scanning-transmission electron microscopy. A correlation has also been established between the morphological analyses and the IZOD impact strength of PVC compounds. PVC compounds were prepared in a Haake Torque Rheometer using various blending conditions. The fusion level of processed compounds was evaluated by DSC thermal analysis and capillary rheological analysis, based on the heat of fusion and entrance pressure drop, respectively. S-shaped fusion curves were obtained. The effects of temperature, rotor speed, and totalized torque on the fusion level of PVC compounds …

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An Improved Method For The Numerical Simulation Of Multiple Droplet Combustion., Ming-Sheng Chia Jan 1994

An Improved Method For The Numerical Simulation Of Multiple Droplet Combustion., Ming-Sheng Chia

LSU Historical Dissertations and Theses

An improved numerical method suitable for multidroplet calculations has been developed. With this improved method the combustion of droplets in a linear array can be simulated much more efficiently. The improved method is first applied to a viscous flow heat transfer model. In this model, momentum and heat transfer results are obtained for a linear array of an arbitrary number of solid spheres at any Reynolds number. The accuracy, flexibility and efficiency of the new method is shown in this model. The method is then used to include liquid-phase motion and a finite-rate, one-step chemical reaction in the gas phase. …

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Application Of Optimum Solutions Of A Diffusion Model To Evaluate The Effects Of Extractives In Wood Drying., Yong Chen Jan 1994

Application Of Optimum Solutions Of A Diffusion Model To Evaluate The Effects Of Extractives In Wood Drying., Yong Chen

LSU Historical Dissertations and Theses

This study evaluates the influence of extractives on moisture diffusivity, and thereby the drying behavior of wood. Extractives are minor chemical components of wood, and their effect on moisture diffusion is sensitive to experimental and calculation errors. A series of studies designed to accurately determine the proper solutions of a diffusion model was done; then studies to determine the effect of extractives in a wood drying system were undertaken. The drying curves derived from the optimum diffusion coefficients gave better prediction of experimental drying data than those derived from traditional approximate methods; therefore, optimum methods were applied in the study …

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Sedimentation Processes In Selected Coastal Wetlands From The Gulf Of Mexico And Northern Europe., John Charles Callaway Jan 1994

Sedimentation Processes In Selected Coastal Wetlands From The Gulf Of Mexico And Northern Europe., John Charles Callaway

LSU Historical Dissertations and Theses

Sediment cores were collected from coastal wetlands from the Gulf coast of North America and northern Europe to study accretion rates and heavy metal accumulation. There was a significant decrease in vertical accretion rates from low to high marsh for Gulf coast samples. Contrary to previous results, these low tidal range sites did not have negative accretion balances. Northern European samples demonstrated the utility of Chernobyl $\sp{137}$Cs as a sediment marker. There were large differences in sediment characteristics and accretion rates between Polish and western European samples. Vertical accretion rates based on $\sp{210}$Pb were lower than $\sp{137}$Cs rates for most …

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A Multi-Faceted Software Reusability Model: The Quintet Web., Youngsuck Cho Jan 1994

A Multi-Faceted Software Reusability Model: The Quintet Web., Youngsuck Cho

LSU Historical Dissertations and Theses

Over the past decade, problems in software development and maintenance have increased rapidly. The size of software has grown explosively, complexity of software applications has increased, the nature of software applications has become more critical, and large quantities of software to be maintained have accumulated. During the same time, the productivity of individual software engineers has not improved proportionally. Software reusability is widely believed to be a key to help overcome the ongoing software crisis by improving software productivity and quality. However, the promise of software reusability has not yet been fulfilled. We present a multi-faceted software reusability model, a …

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The Development Of Bridge Inspection Strategies Based On A Statistical Analysis Of Deterioration In Underwater Structures., Mark Deymond Fugler Jan 1994

The Development Of Bridge Inspection Strategies Based On A Statistical Analysis Of Deterioration In Underwater Structures., Mark Deymond Fugler

LSU Historical Dissertations and Theses

A comprehensive statistical analysis was performed on the condition data generated by a statewide underwater inspection of bridges in Louisiana. The research defined pertinent underwater structural decay characteristics and established a method for establishing a bridge's propensity for underwater deterioration based upon those relevant factors. The inspection results were reviewed to ascertain the impact of human-bias on the consistency in the bridge condition ratings. Using a set of importance factors obtained through a questionnaire submitted to a group of inspectors, the fuzzy set theory was employed to assist in the removal of data incongruities. A combination of pure fuzzy set …

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Statistical Process Control Using On-Line Sensors., Wu-Shong Jwo Jan 1994

Statistical Process Control Using On-Line Sensors., Wu-Shong Jwo

LSU Historical Dissertations and Theses

The traditional control chart method of SPC is a popular tool for monitoring a production process. The method involves randomly drawing a sample of finished items from the process at every equal-time interval to check the product quality and assess the process condition. Because of recent technological advances in computer automation, many kinds of on-line inspection and monitoring equipment, such as sensors, have been developed. This research proposes a two-phase method to monitor the production process during manufacturing operations. Basically, this method is a combination of an on-line sensor and a control-chart method. In the first phase, if the total …

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Reactor Analysis Of Chemical Vapor Deposition Of Titanium Dioxide And Copper Thin Films., Wing-Cheong Gilbert Lai Jan 1994

Reactor Analysis Of Chemical Vapor Deposition Of Titanium Dioxide And Copper Thin Films., Wing-Cheong Gilbert Lai

LSU Historical Dissertations and Theses

A set of reactor models for chemical vapor deposition (CVD) of titanium dioxide films from titanium tetraisopropoxide (TTIP) in a vertical cold-wall CVD reactor has been developed. The effects of the carrier gas on the deposition of TiO$\sb2$ films were examined. The reaction mechanism proposed by the earlier workers in our group was used for the reactor modeling (Siefering and Griffin, 1990a; 1990b). The kinetic parameters were estimated from the reactor models at three levels of approximation; i.e., a lumped parameter (LP) model, a one-dimensional stagnation point flow reactor (1-D SPFR) model, and a full 2-D SPFR model. The 2-D …

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Control Of One Percent Yield Offset In Reaction Injection Molding., Samuel Mills Peebles Jan 1994

Control Of One Percent Yield Offset In Reaction Injection Molding., Samuel Mills Peebles

LSU Historical Dissertations and Theses

Reaction Injection Molding produces parts that must meet property specifications to be useful. For example a car bumper must have a high impact strength to prevent the car from being damaged during a collision. This research presents a control algorithm that can be implemented to control the part properties of reaction injection molded parts. The part property need not be measurable on line if the property is affected by the reaction conditions within the mold. This is an important feature of the algorithm since many important properties, such as yield strength, cannot be measured without destroying the part. The algorithm …

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The Effects Of Computer-Intensive Algebra On Students' Understanding Of The Function Concept., Brian Richard O'Callaghan Jan 1994

The Effects Of Computer-Intensive Algebra On Students' Understanding Of The Function Concept., Brian Richard O'Callaghan

LSU Historical Dissertations and Theses

The purpose of this study is to examine the effects of the Computer-Intensive Algebra (CIA) and traditional algebra (TA) curricula on students' understanding of the function concept. CIA was developed recently in an effort to address some of the deficiencies in TA, namely, its over-emphasis of procedural skills and lack of attention to concepts and problem solving (Fey, 1992; Kieran, 1990). The major features of this innovative curriculum are (a) a problem solving approach based on the modelling and exploration of realistic problem situations, (b) an emphasis on conceptual knowledge, and (c) the extensive use of technology. This study hypothesizes …

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Study Of Asphalt And Polymer-Modified Asphalt: Microstructure, Compatibility And Reinforcement Effect., Zhaoyao Qiu Jan 1994

Study Of Asphalt And Polymer-Modified Asphalt: Microstructure, Compatibility And Reinforcement Effect., Zhaoyao Qiu

LSU Historical Dissertations and Theses

Eight asphalt samples with grades ranging from 10 to 30 from four different sources were examined using NMR, FTIR, differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and constant stress rheometry (CSR). The crystallization process of asphalt is very time dependent. Slow heating or annealing before analysis in order to experimentally realize a close-to-equilibrium state is necessary in order to study the system with more thermodynamic rigor. The DSC method developed in this research shows a possible application in asphalt identification with respect to crude and manufacture source. Dynamic mechanic analysis shows in asphalts only those segments primarily composed of …

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