Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Physical Sciences and Mathematics (1402)
- Chemistry (456)
- Engineering (432)
- Education (195)
- Applied Mathematics (188)
-
- Social and Behavioral Sciences (146)
- Computer Sciences (145)
- Oceanography and Atmospheric Sciences and Meteorology (135)
- Environmental Sciences (115)
- Physics (112)
- Earth Sciences (109)
- Civil and Environmental Engineering (108)
- Chemical Engineering (103)
- Arts and Humanities (94)
- Life Sciences (86)
- Electrical and Computer Engineering (83)
- Mathematics (75)
- Mechanical Engineering (66)
- Business (61)
- Music (58)
- Psychology (57)
- Engineering Science and Materials (48)
- Petroleum Engineering (45)
- Human Resources Management (44)
- Analytical Chemistry (38)
- Curriculum and Instruction (37)
- Quantum Physics (36)
- Physical Chemistry (34)
- Organic Chemistry (31)
- Astrophysics and Astronomy (29)
- Keyword
-
- Louisiana (25)
- Machine learning (25)
- Optimization (22)
- Microfluidics (21)
- Nanoparticles (21)
-
- Synthesis (20)
- Molecular dynamics (17)
- Gulf of Mexico (14)
- Machine Learning (14)
- Modeling (14)
- Gravitational waves (13)
- Mass spectrometry (13)
- Simulation (13)
- GUMBOS (12)
- LIGO (12)
- Quantum (12)
- Retention (12)
- Catalysis (11)
- Fluorescence (11)
- Knot theory (11)
- Optics (11)
- Spectroscopy (11)
- Wetlands (11)
- Atomic force microscopy (10)
- Capillary electrophoresis (10)
- Hurricane (10)
- Intermetallics (10)
- NMR (10)
- Remote sensing (10)
- Cancer (9)
Articles 1891 - 1920 of 2327
Full-Text Articles in Entire DC Network
Using Time-Lapse And Stroboscopic Photography To Enhance Student Understanding Of Plant Growth, Structure, And Pollination: An Inquiry-Based Study, Louis John Schultz
Using Time-Lapse And Stroboscopic Photography To Enhance Student Understanding Of Plant Growth, Structure, And Pollination: An Inquiry-Based Study, Louis John Schultz
LSU Doctoral Dissertations
This study was designed to evaluate the effects of allowing students to generate their own images in a science class as opposed to using pre-existing images. The participants in the study were 7th grade science students enrolled in a small, rural, Louisiana school. A mixed methods design was used so that call available data was collected and analyzed. The lessons used in the study were based on plant structure, growth, and propagation which fit into the mandated 7th grade science curriculum. The students were involved in the taking of still, time-lapse, and stroboscopic images throughout the study. Although an analysis …
Developing/Testing A New Approach For Assessing Rapid Visual Identification Of Hematological Cells Using Principles Of Visual Cognition: A Health Science Education Study, Deborah Elizabeth Fox
Developing/Testing A New Approach For Assessing Rapid Visual Identification Of Hematological Cells Using Principles Of Visual Cognition: A Health Science Education Study, Deborah Elizabeth Fox
LSU Doctoral Dissertations
The purpose of this study was the development and testing of a novel method for assessment of white blood cell (WBC) identification skills used in the field of Clinical Laboratory Sciences (CLS). A dual format exam was administered to both novices (students) and experts (laboratory professionals). Format 1 was similar to current assessment formats, simply presenting a series of single WBC images for identification. Format 2 applied principles of visual cognition, grouping WBCs for identification by patient and presenting multiple example images from the patient before requesting identification of individual cells. This novel exam format was intended to: (a) provide …
Backward Stochastic Navier-Stokes Equations In Two Dimensions, Hong Yin
Backward Stochastic Navier-Stokes Equations In Two Dimensions, Hong Yin
LSU Doctoral Dissertations
There are two parts in this dissertation. The backward stochastic Lorenz system is studied in the first part. Suitable a priori estimates for adapted solutions of the backward stochastic Lorenz system are obtained. The existence and uniqueness of solutions is shown by the use of suitable truncations and approximations. The continuity of the adapted solutions with respect to the terminal data is also established. The backward stochastic Navier-Stokes equations (BSNSEs, for short) corresponding to incompressible fluid flow in a bounded domain $G$ are studied in the second part. Suitable a priori estimates for adapted solutions of the BSNSEs are obtained …
Computing And Analyzing Gravitational Radiation In Black Hole Simulations Using A New Multi-Block Approach To Numerical Relativity, Ernst Nils Dorband
Computing And Analyzing Gravitational Radiation In Black Hole Simulations Using A New Multi-Block Approach To Numerical Relativity, Ernst Nils Dorband
LSU Doctoral Dissertations
Numerical simulations of Kerr black holes are presented and the excitation of quasinormal modes is studied in detail. Issues concerning the extraction of gravitational waves from numerical space-times and analyzing them in a systematic way are discussed. A new multi-block infrastructure for solving first order symmetric hyperbolic time dependent partial differential equations is developed and implemented in a way that stability is guaranteed for arbitrary high order accurate numerical schemes. Multi-block methods make use of several coordinate patches to cover a computational domain. This provides efficient, flexible and very accurate numerical schemes. Using this code, three dimensional simulations of perturbed …
Exploring The Quark-Gluon Content Of Hadrons: From Mesons To Nuclear Matters, Hrayr Hamlet Matevosyan
Exploring The Quark-Gluon Content Of Hadrons: From Mesons To Nuclear Matters, Hrayr Hamlet Matevosyan
LSU Doctoral Dissertations
Even though Quantum Chromodynamics (QCD) was formulated over three decades ago, it poses enormous challenges for describing the properties of hadrons from the underlying quark-gluon degrees of freedom. Moreover, the problem of describing the nuclear force from its quark-gluon origin is still open. While a direct solution of QCD to describe the hadrons and nuclear force is not possible at this time, we explore a variety of developed approaches ranging from phenomenology to first principle calculations at one or other level of approximation in linking the nuclear force to QCD. The Dyson Schwinger formulation (DSE) of coupled integral equations for …
Environmental Equity In Southeast Louisiana: Oil, People, Policy, And The Geography Of Industrial Hazards, Scott Allan Hemmerling
Environmental Equity In Southeast Louisiana: Oil, People, Policy, And The Geography Of Industrial Hazards, Scott Allan Hemmerling
LSU Doctoral Dissertations
This dissertation explores issues and concepts underlying the creation of Louisiana’s rural-industrial petrochemical complex as they relate to environmental equity and industrial development’s deleterious consequences. Cumulative hazards models examine the distribution of technological hazards associated with petroleum extraction and processing and explores how this varies among different socioeconomic groups in three coastal Louisiana parishes. Considerable onshore oil extraction occurs in Jefferson Parish. Lafourche Parish is the primary land-based supply center for the majority of the offshore oil activity in the Gulf of Mexico. The refineries of Saint Bernard Parish represent the endpoint of the flow of raw product and the …
Synthesis And Functionalizations Of Tetrapyrrole Derivatives, Lijuan Jiao
Synthesis And Functionalizations Of Tetrapyrrole Derivatives, Lijuan Jiao
LSU Doctoral Dissertations
Chapter 1 of this Dissertation presents a brief overview of the history of tetrapyrrole derivatives and of their fundamental properties. Overviews of porphyrins, benzoporphyrins, chlorins and porphycenes are presented. Work presented in Chapter 2 through Chapter 4 mainly focuses on the syntheses and functionalization of chromophore-extended porphyrin derivatives. Several new synthetic routes for the syntheses and functionalizations of extended porphyrins either at the β-position or at the meso-position of porphyrin are developed. From these improved synthetic routes, the regio-selective syntheses of porphyrin derivatives are described. Chapter 2 mainly focuses on the syntheses of β,β'-fused methylenepropanoporphyrins and related porphyrin dimers. Chapter …
Epistemological Congruency In Community College Classrooms: Effects Of Epistemological Beliefs On Students Experiences, Cheryl Fruge
Epistemological Congruency In Community College Classrooms: Effects Of Epistemological Beliefs On Students Experiences, Cheryl Fruge
LSU Doctoral Dissertations
The purpose of this mixed method study was to explore epistemological beliefs of students as well as those of their instructors to determine how epistemological congruence or incongruence shapes students’ experiences. The term, “epistemological congruency” is introduced to conceptualize the similarities or differences between students’ and teachers’ epistemological beliefs. Further, the study considers how students’ grades, integration into the academic community, and intentions to persist are related to epistemological congruency between teacher and student. Students and faculty at a community college in the Southeastern United States participated in the study. The theoretical framework for this study is based on Tinto’s …
Predicting Water Quality Effects On Bay Anchovy (Anchoa Mitchilli) Growth And Production In Chesapeake Bay: Linking Water Quality And Individual-Based Fish Models, Aaron Thomas Adamack
Predicting Water Quality Effects On Bay Anchovy (Anchoa Mitchilli) Growth And Production In Chesapeake Bay: Linking Water Quality And Individual-Based Fish Models, Aaron Thomas Adamack
LSU Doctoral Dissertations
Water quality in the Chesapeake Bay and the Patuxent River has decreased since the 1950s due to an increase in nutrient loadings. Increased nutrient loads have caused an increase in the extent and duration of hypoxic conditions. Restoration via large-scale reductions in nutrient loadings is now underway. How reducing nutrient loadings will affect water quality is well predicted; however the effect on fish is generally unknown as most water quality models do not include trophic levels higher than zooplankton. I combined two water quality models with bay anchovy models (Anchoa mitchilli) to examine the effects of changes in nutrient loadings …
The Sociomoral Atmosphere Rating Template (Smart): An Investigation Of Reliability And Validity, Richard Sean Durham
The Sociomoral Atmosphere Rating Template (Smart): An Investigation Of Reliability And Validity, Richard Sean Durham
LSU Doctoral Dissertations
This study describes the development of the Sociomoral Atmosphere Rating Template (SMART), an instrument designed to rate the sociomoral atmosphere in early childhood classrooms, and an investigation of the instrument's reliability and validity. Results indicate that individuals can be trained to reliably use the SMART and that the measure is internally consistent. In addition to its face validity, results indicate that the SMART has convergent validity when compared to the Early Childhood Environmental Rating Scale - Revised (Harms, Clifford, & Cryer, 1998) and the Teacher Interaction Scale (Arnett, 1989). Comparisons at the subscale level suggest discriminant validity. Implications and plans …
Watershed-Scale Patterns Of Seaward Migration In Lentipes Concolor, A Hawaiian Stream Goby, Mark Gordon Mcrae
Watershed-Scale Patterns Of Seaward Migration In Lentipes Concolor, A Hawaiian Stream Goby, Mark Gordon Mcrae
LSU Doctoral Dissertations
The native stream fishes of the Hawaiian Islands are uniquely adapted to colonize and thrive in lotic habitats in this extremely isolated archipelago. Chapter 1 of this dissertation introduces the five native fishes of Hawaii's streams and describes the variety of lotic habitats they occupy. All five species have amphidromous life cycles, and, as such, their larvae must migrate to the ocean soon after hatching. Of the five species, Lentipes concolor is able to scale Hawaii’s highest waterfalls during the migration back into fresh water, and therefore inhabits the widest variety of stream types. Adult L. concolor are found a …
Flow And Distribution Of Water In Fractional Wettability Unsaturated Porous Media, Zaydoun Turkey Abusalem
Flow And Distribution Of Water In Fractional Wettability Unsaturated Porous Media, Zaydoun Turkey Abusalem
LSU Doctoral Dissertations
In recent years, interest in fluid flow and transport in the unsaturated zone has gained more attention, due to growing concerns that the quality of the subsurface environment is adversely affected by agricultural, industrial, and municipal activities. The wettability properties (e.g., water repellency) of soil in the unsaturated zone play an important role in determining fluid movement and ultimate distributions. A number of studies have shown that preferential flow and spatially variable moisture content is likely to occur in water repellant soils. Development of appropriate constitutive relations for numerical modeling becomes even more difficult in systems that contain water repellant …
Knowledge-Based Methods For Automatic Extraction Of Domain-Specific Ontologies, Janardhana R. Punuru
Knowledge-Based Methods For Automatic Extraction Of Domain-Specific Ontologies, Janardhana R. Punuru
LSU Doctoral Dissertations
Semantic web technology aims at developing methodologies for representing large amount of knowledge in web accessible form. The semantics of knowledge should be easy to interpret and understand by computer programs, so that sharing and utilizing knowledge across the Web would be possible. Domain specific ontologies form the basis for knowledge representation in the semantic web. Research on automated development of ontologies from texts has become increasingly important because manual construction of ontologies is labor intensive and costly, and, at the same time, large amount of texts for individual domains is already available in electronic form. However, automatic extraction of …
Computer Model Of Hybrid Compensator Of Fast Varying Loads, Veronica Bohorquez
Computer Model Of Hybrid Compensator Of Fast Varying Loads, Veronica Bohorquez
LSU Doctoral Dissertations
A computer model of the hybrid compensator of fast varying loads was developed in this dissertation. The computer model was implemented in MFC Visual C++ compiler version 6.0. The classification of fast varying loads and effects of their operation in distribution systems were described in this dissertation. The power properties of fast varying loads were expressed in terms of the Currents' Physical Components Theory. Therefore, the Currents' Physical Components Theory was applied to systems with non-periodic voltages and currents. The supply current of the fast varying loads was decomposed into the useful and the useless components using an algorithm based …
The Effects Of 3-Dimensional Cadd Modeling Software On The Development Of The Spatial Ability Of Ninth Grade Technology Discovery Students, K. Lynn Basham
The Effects Of 3-Dimensional Cadd Modeling Software On The Development Of The Spatial Ability Of Ninth Grade Technology Discovery Students, K. Lynn Basham
LSU Doctoral Dissertations
The purpose of this quantitative study was to determine if there is a difference in the development of spatial abilities of ninth grade Technology Discovery students in Mississippi as measured by the Purdue Visualization of Rotations Test. Students experienced one of three differing instructional methods utilizing Pro/Desktop® 3-D CADD solid modeling software. Participants were students in Mississippi schools operating on a 4 x 4 block schedule during either fall or spring semesters during the 2005-2006 school year, and a control group of students whose schools did not offer CADD. Instructional material designed by the researcher was used for two instructional …
Application-Specific Reliable Data Transfer In Wireless Sensor Networks, Damayanti Datta
Application-Specific Reliable Data Transfer In Wireless Sensor Networks, Damayanti Datta
LSU Doctoral Dissertations
A wireless sensor network (WSN) is a collection of sensor nodes and base stations connected via wireless medium. It sends data collected from the nodes to the base stations for generating information. The size and low cost of the sensor nodes as well as the WSN's ability to connect without wired links are its key advantages which enable it to be deployed in hostile or inaccessible environments at low cost. However, WSNs suffer from high data loss due to the inherent weaknesses in a wireless transmission medium, transmission problems in hostile environments due to human interference, etc. and node failures …
Oil Bypassing By Water Invasion To Wells: Mechanisms And Remediation, Juan Carlos Hernandez
Oil Bypassing By Water Invasion To Wells: Mechanisms And Remediation, Juan Carlos Hernandez
LSU Doctoral Dissertations
This study addresses oil bypassing caused by water invasion to wells in edge and bottom water-drive oil reservoirs – a significant problem worldwide. It is shown that the amount of by-passed (not recovered) oil is significant and could be predicted analytically and reduced by modifying well’s completion. A large statistical sample from the population of possible reservoir-well systems with edge and bottom-water has been created theoretically using several databases of actual reservoirs properties worldwide. Dimensional analysis allowed converting reservoir properties distributions into dimensionless group distributions. Then, the amount of by-passed oil was correlated with the dimensionless groups using designed experiments …
Chemical Differences Of Atherosclerotic Plaques In Native And Bypass Human Coronary Arteries And Diseased And Non-Diseased Human Aortas, Samuel Jean Washington
Chemical Differences Of Atherosclerotic Plaques In Native And Bypass Human Coronary Arteries And Diseased And Non-Diseased Human Aortas, Samuel Jean Washington
LSU Doctoral Dissertations
ABSTRACT Cardiovascular disease, primarily atherosclerosis involves a number of distinct processes that are associated with plaque development. The use of differential gel electrophoresis to determine differences between proteins produced in native and bypass coronary arteries from the same heart has been studied. The analytical techniques presented in this study to characterize plaque samples include two dimensional gel electrophoresis, sodium dodecylsulfate polyacrylamide gel electrophoresis, mass spectrometry, differential gel electrophoresis, and high performance liquid chromatography. An overview of the stages involved in atherosclerosis and the theories implicated in the manifestation of atherosclerosis was presented. A design study using the Box Behnken method …
Wind Loads For Petrochemical Structures, Samuel Amoroso
Wind Loads For Petrochemical Structures, Samuel Amoroso
LSU Doctoral Dissertations
Techniques currently available to practicing engineers for estimating wind loads for petrochemical structures have little theoretical or experimental basis. This dissertation research is an effort to expand the understanding of wind effects on petrochemical and other, similar structures. Petrochemical structures introduce geometric scales into wind tunnel model simulations below what are common for enclosed structures. Wind tunnel experiments were performed to help determine whether this will introduce problems in achieving dynamic similarity between models and prototypes. The experiments did not reveal any clear indication that petrochemical structures cannot be modeled in wind tunnels at scales similar to those used for …
Interactions Of The Triaquatricarbonylrhenium(I) Cation With Nucleotides And Other N-Donor Ligands, Kristie Marie Adams
Interactions Of The Triaquatricarbonylrhenium(I) Cation With Nucleotides And Other N-Donor Ligands, Kristie Marie Adams
LSU Doctoral Dissertations
Transition metal centers possessing an octahedral geometry are useful for understanding the natural role of metal ions in biology. Complexes based on such metals might improve upon the widely used square planar Pt(II) anticancer drug cisplatin, cis-[Pt(NH3)2Cl2]. The octahedral triaquatricarbonylrhenium(I) cation, fac-[Re(CO)3(H2O)3]+, has been shown to possess anticancer activity. Furthermore, Re(I) complexes containing unstable rhenium isotopes have found utility as radiodiagnostic and radiotherapeutic agents. Thus, this work focuses on elucidating the fundamental coordination chemistry of fac-[Re(CO)3(H2O)3]+ …
Effects Of Capping On Biodegradation Of Organic Contaminants In Sediments, Eun Ju Lee
Effects Of Capping On Biodegradation Of Organic Contaminants In Sediments, Eun Ju Lee
LSU Doctoral Dissertations
Sediment capping remains an effective remediation technique for contaminated sediments due to its capability to contain contaminants and provide a sound habitat for indigenous biota. This research investigated the effect of capping on biodegradation of organic contaminants in Anacostia River sediments using both experimental and modeling techniques. 14C–Phenanthrene mineralization was monitored under various redox conditions in Anacostia River sediments. Mineralization of 14C–phenanthrene was strongly linked to sulfate reduction, which was the more energetic process than any other anaerobic condition in Anacostia sediments. Sulfate is a more promising terminal electron acceptor for intrinsic degradation in Anacostia River and other PAH contaminated …
Improving High School Physical Science Students' Understanding Of The Electromagnetic Spectrum: A Modified Diagram Approach, James Edward Quebedeaux
Improving High School Physical Science Students' Understanding Of The Electromagnetic Spectrum: A Modified Diagram Approach, James Edward Quebedeaux
LSU Doctoral Dissertations
The focus of this study was to identify major conceptual difficulties that selected public high school physical science students encounter in understanding a standard electromagnetic spectrum diagram. A research-driven, modified version of that standard diagram was used in this study to determine the value added to student understanding of electromagnetic waves. A content analysis was performed on electromagnetic spectrum diagrams found in US textbooks from the 1950s through the present. A class of public high school physical science students participated in a study consisting of four activities conducted during a three-week unit. Students were given a pre- and post-achievement test …
Using Power Spectra To Look For Anisotropies In Ultra-High Energy Cosmic Ray Distributions, Megan Alicia Mcewen
Using Power Spectra To Look For Anisotropies In Ultra-High Energy Cosmic Ray Distributions, Megan Alicia Mcewen
LSU Doctoral Dissertations
The origins and compositions of ultra-high energy cosmic rays (UHECR) remains a mystery to this day. The Pierre Auger Observatory (PAO) is being constructed now in the hopes that it will help solve this mystery by detecting more UHECR than any previous experiment. In this dissertation, I will discuss this experiment, and analyze the data collected so far by comparing it with simulated data from possible source distributions. In these simulations, I will track antiprotons, along with other possible cosmic ray primaries, through various models of galactic and extragalactic magnetic fields. Once they reach a certain distance, I will record …
Fabrication Of Dna Microarrays On Poly (Methylmethacrylate) Substrates For Biomolecular Reporting, Catherine N. Situma
Fabrication Of Dna Microarrays On Poly (Methylmethacrylate) Substrates For Biomolecular Reporting, Catherine N. Situma
LSU Doctoral Dissertations
DNA microarrays require the use of substrates with well-established surface modification / probe attachment chemistries. Glass/quartz have been widely adopted as typical support materials since their surface modification chemistries which involve the use of siloxane –based chemistries have been widely studied however; these chemistry is susceptible to hydrolytic cleavage especially at high or low pH values. Recently, polymers have been sought as alternative microarray support materials but their surface modification strategies are not well characterized compared to glass. This report will entail surface photo-modification of PMMA polymer substrates by UV irradiation which produces functional scaffolds of carboxylic groups that allow …
The Disciples Of Light: A Way Of Seeing And The Educational Transfer Of Ideas Linking Spirituality And Art Among Southern Painters In The Hensche-Hawthorne Tradition, Barbara Naron Faulkner
The Disciples Of Light: A Way Of Seeing And The Educational Transfer Of Ideas Linking Spirituality And Art Among Southern Painters In The Hensche-Hawthorne Tradition, Barbara Naron Faulkner
LSU Doctoral Dissertations
This study examines the role of artistic education in shaping artistic beliefs and personal philosophy. Its central focus is the origins of a common belief among artists that artmaking or aesthetic response to art can be a form of spiritual activity or experience leading to spiritual insight. The primary data for this study is a series of in-depth oral history interviews with seven painters who studied with Henry Hensche at The Cape School of Art in Provincetown, MA, a school of American plein air painting that is linked with Impressionism. Charles W. Hawthorne, a painter who was a protégé of …
A Comparison Of Individual-Based And Matrix Projection Models To Applied To Fish Population And Community Dynamics, Shaye Ellen Sable
A Comparison Of Individual-Based And Matrix Projection Models To Applied To Fish Population And Community Dynamics, Shaye Ellen Sable
LSU Doctoral Dissertations
Matrix projection models and individual-based models (IBM) are commonly used for the analysis and management of fish populations. Matrix models break down the population into age or stage classes, while IBMs track individuals. I perform a series of quantitative comparisons between the predictions of the two modeling approaches using the IBM as the standard of comparison to demonstrate when individual variation, species interactions, and spatial heterogeneity adversely affect matrix model performance. I first evaluate the matrix approach for predicting yellow perch population responses when perch are involved in size-specific predator-prey interactions with walleye. I created density-dependent and stochastic age-structured and …
Sign Ambiguities Of Gaussian Sums, Heon Kim
Sign Ambiguities Of Gaussian Sums, Heon Kim
LSU Doctoral Dissertations
In 1934, two kinds of multiplicative relations, extit{norm and Davenport-Hasse} relations, between Gaussian sums, were known. In 1964, H. Hasse conjectured that the norm and Davenport-Hasse relations are the only multiplicative relations connecting the Gaussian sums over $mathbb F_p$. However, in 1966, K. Yamamoto provided a simple counterexample disproving the conjecture when Gaussian sums are considered as numbers. This counterexample was a new type of multiplicative relation, called a {it sign ambiguity} (see Definition ef{defi:of_sign_ambi}), involving a $pm$ sign not connected to elementary properties of Gauss sums. In Chapter $5$, we provide an explicit product formula giving an infinite class …
Population Ecology Of Pseudacteon Tricuspis Borgmeier (Diptera: Phoridae), An Introduced Parasitoid Of The Red Imported Fire Ant Solenopsis Invicta Buren (Hymenoptera: Formicidae) In Louisiana, Donald Charles Henne
Population Ecology Of Pseudacteon Tricuspis Borgmeier (Diptera: Phoridae), An Introduced Parasitoid Of The Red Imported Fire Ant Solenopsis Invicta Buren (Hymenoptera: Formicidae) In Louisiana, Donald Charles Henne
LSU Doctoral Dissertations
Aspects of the population ecology of a parasitoid (Pseudacteon tricuspis) of the red imported fire ant (Solenopsis invicta) in Louisiana were studied. The spatio-temporal abundance patterns, dispersal, population spread, aggregation, direct mutual interference and functional response characteristics of this parasitoid were studied to address deficiencies in our knowledge about phorid flies, particularly Pseudacteon parasitoids. This endoparasitoid was discovered to manipulate host ant behavior in ways that benefit its own survival. Laboratory experiments to gain insights into behavioral and functional responses revealed that fly aggregations were density-dependent and interference was not significant when 1-3 females were simultaneously confined with hosts, although …
Locally Derived Nonpoint Loading Estimates For The Boeuf River/Bayou Lafourche Watershed, Emerald Purser Roider
Locally Derived Nonpoint Loading Estimates For The Boeuf River/Bayou Lafourche Watershed, Emerald Purser Roider
LSU Doctoral Dissertations
There is currently a great demand for data and models that can be used to quantify nonpoint source pollutant loads from different land-use types. The Louisiana Department of Environmental Quality (LDEQ) is in the process of implementing management programs for impacted water bodies based on the Total Maximum Daily Load (TMDL) of a pollutant. Pollutants of concern include total suspended solids (TSS), nitrogen, and phosphorus. One of the key parameters in determining the TMDL of a water body is the nonpoint source pollutant load from different land-use types. To date, such load estimates in Louisiana are lacking. The primary objective …
Factors Influencing The Spatial Distribution Of Natural Resource-Based Industries: The Softwood Lumber Industry In The United States South, Francisco Xavier Aguilar
Factors Influencing The Spatial Distribution Of Natural Resource-Based Industries: The Softwood Lumber Industry In The United States South, Francisco Xavier Aguilar
LSU Doctoral Dissertations
Expanding on the Theory of Location, New Economic Geography, and Porter's Theory of Clusters this dissertation attempts to identify key factors influencing the location of firms in a resource-based industry. The softwood lumber industry in the United States is used as a case study to test several hypotheses concerning these theories. Two U.S. regions, the West and the South, were selected for analysis because they account for over 70 percent of U.S lumber manufacturing capacity. A multi-disciplinary research approach involved three-stages. First, self-reported preferences were analyzed using common factor and conjoint analyses for preferences for location attributes. Surveys were sent …