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2001

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Molding Large Area Plastic Parts Covered With Harms., Mircea Stefan Despa Jan 2001

Molding Large Area Plastic Parts Covered With Harms., Mircea Stefan Despa

LSU Historical Dissertations and Theses

Injection molding and hot embossing proved to be suitable for use to reproduce layouts of micropatterns manufactured by LIGA. The research work was based on two commercially available machines. Preliminary experiments with both machines indicated that several modifications and additions were necessary to adapt the injection machine and the embossing press for microreplication. For the injection machine, a mold geometry was designed to ensure minimal pressure loss upstream from the entrance into the mold cavity, and optimal shape for molding and demolding. For the hot embossing press, a vacuum chamber was designed containing the embossing sandwich, with the temperatures of …

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Factors Affecting Community Structure Of Mangroves Associated With Point Bars And Islands In A Costa Rican Estuary., Patricia Delgado-Sanchez Jan 2001

Factors Affecting Community Structure Of Mangroves Associated With Point Bars And Islands In A Costa Rican Estuary., Patricia Delgado-Sanchez

LSU Historical Dissertations and Theses

A conceptual model of relationships between mangrove community structure and their physico-chemical environment is developed for point bars and islands in the Tempisque-Bebedero estuarine system, Pacific coast, Costa Rica. The model identifies key variables whose relationships to mangrove forest structure are the focus of extended field and mesocosm studies. Point bars and islands are very dynamic features constantly modified by hydrology and sediment dynamics. In the Tempisque-Bebedero system, they are additionally modified by extensive agricultural activities. High riverine sediment loads, associated with irrigation and seasonal wind-driven resuspension, result in significantly higher sediment deposition in lower intertidal zones; upper intertidal zones …

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Active Control Of Thermoacoustical Instabilities., Daniel Ulises Campos-Delgado Jan 2001

Active Control Of Thermoacoustical Instabilities., Daniel Ulises Campos-Delgado

LSU Historical Dissertations and Theses

This dissertation presents some advances in active control of thermoacoustic instabilities in combustion chambers. Large-size gaseous and liquid fueled swirl stabilized combustors were used during the studies. Active control was implemented using different types of actuators. Proportional (loudspeakers and fuel valves) and discrete actuators (open-close automotive fuel injectors) were investigated. Acoustic and fuel modulation control were successfully applied. In large-scale combustors, flame stabilization techniques such as swirl add three dimensional characteristics to the flow. Moreover, the induced turbulence creates highly nonlinear interactions in the system. Thus, in order to capture these characteristics nonlinear partial differential equations have to be used. …

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Electronic Communication Channels In Franchise Organizations., Michael Hebert Dickey Jan 2001

Electronic Communication Channels In Franchise Organizations., Michael Hebert Dickey

LSU Historical Dissertations and Theses

The virtual organization has emerged as a result of the availability of information technology. One business model well suited to the virtual form is franchising. Since the success of franchise organizations is highly dependent on communication effectiveness, these organizations are beginning to adopt technology---namely, private corporate networks called intranets and extranets---to support electronic communication. This research study examines the effects of electronic communication channels on communication patterns within franchise organizations. First, the study addresses how electronic communication channels affect communication frequency within the franchise organization. Second, the effect of electronic communication channels on strategic outcomes, specifically, innovation, franchisee satisfaction, and …

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A Performer's Guide To Theatrical Elements In Selected Trombone Literature., Cason Austin Duke Jan 2001

A Performer's Guide To Theatrical Elements In Selected Trombone Literature., Cason Austin Duke

LSU Historical Dissertations and Theses

In the last forty years, many new solo and chamber pieces have been written for the trombone which involve elements of a theatrical nature, including lighting, make-up, costume, stage direction, dialogue/narration, sound effects, props, and audience interaction. It is difficult for a trombonist searching for music to discern a piece's theatrical nature by its listing in most catalogs. This document has attempted to solve that problem by gathering pieces that share these elements into an annotated collection. Nearly 200 pieces were discovered through contacts made with individual trombonists, composers, and publishers around the world. Of these, over sixty were acquired …

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Glyphosate- And Glufosinate -Resistant Technologies: Weed Management And Off-Target Crop Response., Jeffrey Mark Ellis Jan 2001

Glyphosate- And Glufosinate -Resistant Technologies: Weed Management And Off-Target Crop Response., Jeffrey Mark Ellis

LSU Historical Dissertations and Theses

Utility of preemergence soil-applied herbicides at full and half label rates were evaluated in glyphosate-resistant soybean. In most instances, differences in early season weed density and height were not noted when rates were reduced. None of the herbicides provided complete weed control, but some delayed weed growth providing an extra 3 to 7 days before the first postemergence glyphosate application was needed. Based on weed control and soybean yield, use of glyphosate alone was as effective as when preemergence herbicides were followed by glyphosate. In another study, barnyardgrass control with glyphosate at 0.84 and 1.12 kg ai/ha was not antagonized …

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Subthreshold Photoionization In Molecular Dopant/Perturber Systems., Cherice Marie Evans Jan 2001

Subthreshold Photoionization In Molecular Dopant/Perturber Systems., Cherice Marie Evans

LSU Historical Dissertations and Theses

The use of atomic and molecular Rydberg states to investigate dopant/perturber interactions is a well established research area. In this Dissertation, photoionization spectroscopy is used to probe the interactions between various dopants (D = CH3I, C2H5I and C6H6) and perturbers (P = Ar, N2, CO2, CF4, c-C4F8 and SF6) in a static gas-phase system. One overall goal is a better understanding of the nature of dopant/perturber interactions in the gas phase which, in turn, can lead to a better understanding of solvation in the condensed phase. Two separate perturber effects are investigated in this work: the perturber-induced energy shift of …

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Language And Power In A Louisiana Murder Trial: Discourse Features In Witness Testimony., Kara Lynn Gibson Jan 2001

Language And Power In A Louisiana Murder Trial: Discourse Features In Witness Testimony., Kara Lynn Gibson

LSU Historical Dissertations and Theses

The literature concerning language, law, and power has traditionally focused on the linguistic strategies legal professionals employ for the purpose of controlling the speech of their clients and/or witnesses. However, newer research, stemming from gender-based theories of how power and/or powerlessness is manifest in language, promotes linguistic analyses from the perspective of the disempowered as opposed to the empowered, Such studies claim that speakers' election or avoidance of certain discourse features (e.g., hedges, hypercorrect forms, polite address forms, overlap, quotatives and gestures, etc.) and responses-types (e.g., declarative-context questions, copy responses, fragmented versus narrative responses, etc.) reflects their perceived power as …

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Synthetic Peptides: Design, Structure And Biological Function., Lars Gustav Johan Hammarstrom Jan 2001

Synthetic Peptides: Design, Structure And Biological Function., Lars Gustav Johan Hammarstrom

LSU Historical Dissertations and Theses

The synthesis of a series of polyfunctional Calpha,C alpha-disubstituted glycines is described. The lysine-like amino acid analog, Api, was prepared by regioselective hydrolysis of a triBoced hydantoin, followed by Nalpha-protection to yield the first orthogonally protected ionizable Calpha,Calpha-disubstituted amino acid which is alicyclic. The synthesis of three orthogonally protected tetrafunctional amino acids, Bap, Bglu, and Basp was envisioned by alkylation of the organic synthon ethyl nitroacetate. Subsequent regioselective modification should allow for the isolation of the first tetrafunctional amino acid derivatives suitable for solid-phase synthesis. These amino acids are designed to induce peptide secondary structure by salt-bridge stabilization. A series …

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Synthesis, Isolation, And Characterization Of Novel Organic Electronic Architectures., Taiya Sprull Fabre Jan 2001

Synthesis, Isolation, And Characterization Of Novel Organic Electronic Architectures., Taiya Sprull Fabre

LSU Historical Dissertations and Theses

Interest in the fullerenes is due, in large part, to the fact that they represent the third major form of carbon, following graphite and diamond. We have investigated synthetic methods towards the creation of new carbon molecules derived from the fullerenes. The sought-after dimeric carbon fullerene derivative, C122, was successfully synthesized and isolated for the first time in modest yield from a complex reaction mixture. The all-carbon molecular allotrope was prepared via the new reaction of C60 with atomic carbon in solution. Atomic carbon was produced via the known thermolytic decomposition of diazotetrazole. Future work that could emanate from these …

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The Influence Of Agricultural Policy On Economic Integration Among Central American Countries: A Game Theoretic Analysis., Jorge Luis Icabalceta Mairena Jan 2001

The Influence Of Agricultural Policy On Economic Integration Among Central American Countries: A Game Theoretic Analysis., Jorge Luis Icabalceta Mairena

LSU Historical Dissertations and Theses

The influence of eight commodity groups on international economic integration in five Central American countries are analyzed. The commodity groups are rice, beans, corn, sorghum, bananas, coffee, sugar, and beef. The countries are Costa Rica, El Salvador, Guatemala, Honduras, and Nicaragua. A game theory framework is used to find a Nash equilibrium solution to a set of trade negotiation scenarios. The payoffs of the Political Preference Function (PPF) are used for the trade liberalization scenarios under analysis. These PPF payoffs are estimated using the MISS model. The nominal protection coefficient (NPC) is used as the main criterion for trade liberalization. …

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X -Ray Absorption Fine Structure (Exafs And Xanes) And Microscopic Investigations Of Supramolecular Systems., Pierre Nicolas Floriano Jan 2001

X -Ray Absorption Fine Structure (Exafs And Xanes) And Microscopic Investigations Of Supramolecular Systems., Pierre Nicolas Floriano

LSU Historical Dissertations and Theses

Self-assembled monolayers of n-alkanethiols, CH3-(CH 2)x-SH, on Au, Ag, and Cu have been studied with Grazing incidence EXAFS (GIXAFS) at the sulfur K-edge. Characterization of the bonding of self-assembled monolayers is of great interest because of their ability to tailor physical and chemical properties of surfaces. For both pentanethiol and decanethiol monolayers on Ag and Cu, the three-fold hollow site is found to be the most probable sulfur binding site. However, observations for octadecanethiol indicate that the three-fold-hollow site is not the exclusive binding site. In addition, the possible existence of disulfide bonds on the metal surface (adsorbed dialkyldisulfides) is …

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"Good Friday": A Guide To The Chamber Opera Of Luigi Zaninelli., Maryann Kyle Jan 2001

"Good Friday": A Guide To The Chamber Opera Of Luigi Zaninelli., Maryann Kyle

LSU Historical Dissertations and Theses

Compositions by Mississippi composer Luigi Zaninelli, born in Raritan, New Jersey, on March 30, 1932, have recently reached seven and one-half million copies sold by music publisher Shawnee Press. Although Zaninelli's chorus, band, vocal, and orchestra compositions have received international acclaim, he has only recently begun to compose operatic works. The composer began to explore the world of opera at the urging of his former teacher, the famed Italian-American composer Gian Carlo Menotti. Zaninelli's three operas, Snow White-The Opera (1996), Mr. Sebastian (1997), and Good Friday (1998) represent his first forays into this complex musical idiom. It is the object …

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Analysis Of Hydrocarbon Materials By Use Of Nonpolar Matrices In Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry (Maldi-Ms)., Stephen Francis Macha Jan 2001

Analysis Of Hydrocarbon Materials By Use Of Nonpolar Matrices In Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry (Maldi-Ms)., Stephen Francis Macha

LSU Historical Dissertations and Theses

In this study, polyaromatic hydrocarbon compounds including anthracene, pyrene, acenaphthene and perylene were investigated as nonpolar matrices in matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) for the analysis of selected nonpolar analytes. First, the influence of matrix and the analyte ionization potentials on a charge-transfer ionization mechanism were determined. Results of these studies demonstrated that formation of radical molecular cations in MALDI-MS depends on the ionization energy difference between the matrix and the analyte. Charge-transfer ionization occurs only when the ionization potential of the matrix is higher than that of the analyte. Next, nonpolar matrices were investigated for the analysis of …

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Benthic Foraminifera In Two Stressed Environments Of The Northern Gulf Of Mexico., Emil Platon Jan 2001

Benthic Foraminifera In Two Stressed Environments Of The Northern Gulf Of Mexico., Emil Platon

LSU Historical Dissertations and Theses

This is a study of Foraminifera from two stressed environments of the northern Gulf of Mexico: one of coastal seasonal hypoxia, the other of hydrocarbon seeps in bathyal depths---oxygen depletion being the common stressor. Many species of benthic Foraminifera survive the extreme oxygen depletion of Louisiana shelf waters in spring and summer. The dominant species are infaunal and have an adaptive tolerance to near anoxia or anoxia. A census of foraminiferal species present in dated sediment core samples reveals significant changes in the composition of the Louisiana-shelf benthic foraminiferal community in the past century. Agglutinated and porcelaneous orders living in …

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Self -Directed Learning And Learner -Control Sequencing: An Examination Of The Relationship Between Two Instructional Delivery Systems And The Acquisition And Application Of Subject Matter For Teacher Candidates., Martha Ellen Ratcliff Jan 2001

Self -Directed Learning And Learner -Control Sequencing: An Examination Of The Relationship Between Two Instructional Delivery Systems And The Acquisition And Application Of Subject Matter For Teacher Candidates., Martha Ellen Ratcliff

LSU Historical Dissertations and Theses

The purpose of this study is to examine the relationship between different instructional delivery systems (learner-control versus instructor-control) and the acquisition and application of subject matter by teacher candidates. Further, self-directed teaming and student ability are utilized to predict student outcomes. Prior technology ability and student ability and learner-controlled sequencing events during a Web-based lesson are also analyzed for predicting student outcomes. Finally, teaming and assessment time of subjects in the learner-control group are measured. Undergraduate and graduate students (N = 99) enrolled in an undergraduate language arts course participated in the study. Subjects in the learner-control group teamed about …

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Shell Model Description Of Normal Parity Bands In Heavy Deformed Nuclei., Gabriela Popa Jan 2001

Shell Model Description Of Normal Parity Bands In Heavy Deformed Nuclei., Gabriela Popa

LSU Historical Dissertations and Theses

The low-energy spectra and electromagnetic transition strengths in 160,162,164Dy, 156,158,160Gd, and 168Er are described in the framework of the pseudo-SU(3) model. The Hamiltonian includes spherical single-particle energies, the Quadrupole-quadrupole interaction, and proton and neutron pairing terms with the strengths of these interaction fixed from systematics. The strengths of an additional four rotor-like terms that are included in the Hamiltonian, which do not mix SU(3) representations and induce only small changes in the spectra, were allowed to vary and a consistent set of these parameters was found. Proton and neutron degrees of freedom are considered explicitly by building the basis states …

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Worldly Rites: The Social And Political Significance Of Religious Services In Louisiana, 1803--1865., Julia Huston Nguyen Jan 2001

Worldly Rites: The Social And Political Significance Of Religious Services In Louisiana, 1803--1865., Julia Huston Nguyen

LSU Historical Dissertations and Theses

In antebellum and Civil War Louisiana, religious rituals contained more than spiritual meaning. They also carried social and political significance that can illustrate a great deal about that society. Sabbath services, holidays, revivals, baptisms, weddings, and funerals all reflected the values that Louisianans believed to be important. By looking at religion and the ways that residents of Louisiana experienced it, not only on a daily basis but also during the major milestones of life, one can come to a greater understanding of the ways in which they structured their society and interacted with it. Through an examination of Louisiana religion, …

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Synthesis Of Phosphonopeptides And Alpha, Alpha-Dialkylated Amino Acid-Rich Peptides., Sheila Denise Rushing Jan 2001

Synthesis Of Phosphonopeptides And Alpha, Alpha-Dialkylated Amino Acid-Rich Peptides., Sheila Denise Rushing

LSU Historical Dissertations and Theses

Peptides and peptide analogs are central to the understanding of biological and biochemical phenomena as well as in the development of new pharmaceutical agents. This research encompasses two classes of peptide mimetics: phosphonopeptides and short, amphipathic peptides rich in alpha,alpha-disubstituted amino acids (alphaalphaAA). The focus of the first part of the peptide analog project was on the preparation of sterically-hindered phosphonamide and thiophosphonamide dipeptides. Conditions were developed, based on our P(III) synthetic approach, for the preparation of the phosphonamide dipeptides, Cbz-CyhGly psi [P (O) (OpNb) NH] Trp-NH2 and Cbz-CyhGly psi [P (O) (OpNb) NH] Trp-OMe, which were previously unattainable by …

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Middle School Students' Understanding Of The Natural History Of The Earth And Life On Earth As A Function Of Deep Time., Azalie Cecile Pulling Jan 2001

Middle School Students' Understanding Of The Natural History Of The Earth And Life On Earth As A Function Of Deep Time., Azalie Cecile Pulling

LSU Historical Dissertations and Theses

The purpose of this study was to use deep time, that is geologic time as a mechanism to explore middle school students' understanding of the natural history of the earth and the evolution of life on earth. Geologic time is a logical precursor to middle school students' understanding of biological evolution. This exploratory, mixed model study used qualitative and quantitative methods in each stage of the research to explore sixth grade students, understanding of geologic time, their worldviews (e.g., conceptual ecology), and conceptual change. The study included fifty-nine students in the large group study and four case studies. The primary …

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Campus Responsibility For Alcohol -Related Injuries: A Law And Policy Analysis., Nathan Mccain Roberts Jan 2001

Campus Responsibility For Alcohol -Related Injuries: A Law And Policy Analysis., Nathan Mccain Roberts

LSU Historical Dissertations and Theses

The purpose of this study was to explore the evolution of the legal concept of legal liability of higher education institutions for alcohol-related injuries using a theoretical framework provided by tort law. The analysis was designed to provide a greater understanding of how and why the law concerning this concept has evolved. In addition to a legal analysis, interviews were conducted with student affairs administrators at institutions participating in the Robert Wood Johnson Foundation "A Matter of Degree: Reducing High-Risk Drinking Among College Students" program. Particular attention was given to the influences identified by the student affairs administrators as catalysts …

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Women And The Law Of Property Under Louisiana Civil Law, 1782--1835., Sara Jane Brooks Sundberg Jan 2001

Women And The Law Of Property Under Louisiana Civil Law, 1782--1835., Sara Jane Brooks Sundberg

LSU Historical Dissertations and Theses

This dissertation explores the influence of Louisiana civil law on women's property ownership between 1782 and 1835. Louisiana civil law offered women significant advantages over the predominant common law tradition found in most early American states. Louisiana civil law, unlike common law, allowed a married woman to retain her legal identity, her personal property and her right to monetary rewards from her labors within the family. A woman in early Louisiana owned half the property accumulated during marriage and she inherited her half of the property at the dissolution of the marriage. She also owned and could administer separate property. …

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Systemic And Colonic Hemodynamic And Vasomotor Responses To Adenosine Triphosphate In Horses., Joanne Tetens Jan 2001

Systemic And Colonic Hemodynamic And Vasomotor Responses To Adenosine Triphosphate In Horses., Joanne Tetens

LSU Historical Dissertations and Theses

Clinically healthy horses were instrumented to measure hemodynamic, metabolic, hematologic, and serum biochemical variables and monitor clinical signs during and after IV infusion of ATP-MgCl2. Conscious horses were administered ATP-MgCl2 (0.05 mg ATP/kg body weight/min; 0.05 mg/kg/min increments; maximum rate-1.0 mg/kg/min), which caused a rate-dependent increase in cardiac output, decrease in systemic vascular resistance, and mild pulmonary hypertension. The maximal safe infusion rate was 0.3 mg ATP/kg body weight/min. Anesthetized horses administered ATP-MgCl2 (0.1 to 1 mg/kg/min; 0.1 mg/kg/min increments) developed a rate-dependent decrease in systemic and colonic vascular resistance via vasodilatation. In conscious horses administered lowdose endotoxin, ATP-MgCl2 (dose-100 …

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Medical Image Set Compression Using Wavelet And Lifting Combined With New Scanning Techniques., Rahman Tashakkori Jan 2001

Medical Image Set Compression Using Wavelet And Lifting Combined With New Scanning Techniques., Rahman Tashakkori

LSU Historical Dissertations and Theses

Today, hospitals are desirous of better methods for replacing their traditional film-based medical imaging. A major problem associated with a "film-less hospital" is the amount of digital image data that is generated and stored. Image compression must be used to reduce the storage size. This dissertation presents several techniques involving wavelet analysis, lifting, image prediction and image scanning to achieve an efficient diagnostically lossless compression for sets of medical images. This dissertation experimentally determines the optimal wavelet basis for medical images. Then, presents a new wavelet based prediction method for prediction of the intermediate images in a similar set of …

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Red Morningglory (Ipomoea Coccinea L.) And Sugarcane Response To Soil-Applied Herbicides., Blaine Joseph Viator Jan 2001

Red Morningglory (Ipomoea Coccinea L.) And Sugarcane Response To Soil-Applied Herbicides., Blaine Joseph Viator

LSU Historical Dissertations and Theses

Laboratory and greenhouse studies were conducted to determine if reported red morningglory (Ipomoea coccinea L.) control failures with atrazine in sugarcane are due to triazine-resistant mutants. Terminal fluorescence of leaf material from locations with and without a history of atrazine use increased after treatment with atrazine, indicating electron transport inhibition and hence, triazine susceptibility. Postemergence (POST) application of atrazine controlled plants from all populations at least 99%, supporting findings of the fluorescence assay. A field study was conducted to evaluate red morningglory control and sugarcane injury with herbicides applied at layby. At 45 days after treatment (DAT), control with sulfentrazone …

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Center Vortices In Confinement., Viorel-Andrei Alexandru Jan 2001

Center Vortices In Confinement., Viorel-Andrei Alexandru

LSU Historical Dissertations and Theses

The confinement property of quarks is still one of the puzzles of today's physics. Although QCD is believed to accurately describe the interaction between quarks, due to the peculiar nature of the theory we are still unable to prove that it confines the quarks. Most analytical efforts in QCD are based on perturbative techniques which are useless in studying confinement. Lattice gauge theory enables us to get non-perturbative results. We use lattice techniques to investigate one of the proposed mechanisms of quark confinement, namely the center vortex idea. We first present a cursory introduction to lattice theory and the methods …

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School Culture, Teacher Efficacy, And Decision -Making In Demonstrably Effective And Ineffective Schools., Jacquline Jeanine Bobbett Jan 2001

School Culture, Teacher Efficacy, And Decision -Making In Demonstrably Effective And Ineffective Schools., Jacquline Jeanine Bobbett

LSU Historical Dissertations and Theses

The purpose for this study was fourfold. First, a conceptual model was developed to help understand teacher perceptions of the schools' professional culture, teachers' self-efficacy beliefs, participation in decision making and linkages to school effectiveness. Second, an original measure of teachers' self-efficacy beliefs about their own teaching effectiveness was developed and tested. Third, characteristics of the measures (quantitative and qualitative) were reported. Fourth differences in the mediating variables related to school effectiveness were examined. A stratified sample made up of 1,057 total school faculty in 41 elementary schools representing the uppermost and lower most quartiles of poverty in a southern …

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A Study Of The Measurement And Sources Of Teachers' Self And Collective Efficacy Beliefs In Professional Learning Environments., Amy Marie Barrilleaux Dellinger Jan 2001

A Study Of The Measurement And Sources Of Teachers' Self And Collective Efficacy Beliefs In Professional Learning Environments., Amy Marie Barrilleaux Dellinger

LSU Historical Dissertations and Theses

This study examined relationships between sources of efficacy information available in teachers' professional learning environments and teacher self-, work-group collective and faculty collective efficacy beliefs. An argument is presented that teachers' individual and collective efficacy beliefs are vital factors that mediate linkages between professional learning and meaningful change in schools. School professional learning environments are hypothesized to provide efficacy information that may serve to enhance teachers' beliefs in their abilities to accomplish tasks that are linked to effective teaching and learning. Social cognitive theory and triadic reciprocal causation provided the framework for this research. Self-efficacy theory, a sub-theory of social …

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Teacher Education Reform And Accountability: A Study Of The Louisiana Blue Ribbon Commission On Teacher Quality., Patricia Ann Davis Exner Jan 2001

Teacher Education Reform And Accountability: A Study Of The Louisiana Blue Ribbon Commission On Teacher Quality., Patricia Ann Davis Exner

LSU Historical Dissertations and Theses

This study describes Louisiana's 1999--2000 Blue Ribbon Commission on Teacher Quality, focusing primarily on Commission proceedings and the evolution of its recommendations within a context of standards-based teacher education reform history. Employing case study methodology contextualized in historical and ethnographic narrative, this nine month study examined policy recommendations for Louisiana's teacher education programs that resulted from Commission meetings. Aims of the study included describing the development of these recommendations, their relation to national teacher education reform movements, and their potential impact on university teacher preparation programs. The research provides not only documentation of Commission proceedings of some historical value, but …

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Surface Modification And Characterization Of Pmma Used In The Construction Of Microelectromechanical Systems., Alyssa Catharyn Henry Jan 2001

Surface Modification And Characterization Of Pmma Used In The Construction Of Microelectromechanical Systems., Alyssa Catharyn Henry

LSU Historical Dissertations and Theses

Poly(methyl methacrylate), PMMA, is a standard photoresist and is also a popular material out of which microelectromechanical systems are made. Described within is the characterization of the bulk and surface properties of commercial PMMA sheets and their relevance to PMMA as a photoresist. The surface chemical modification and characterization of commercial PMMA sheets is discussed; these modifications and their chemical properties have direct pertinence to the use of PMMA as a substrate for the fabrication of microelectromechanical devices. The molecular masses of pristine and irradiated PMMAs were determined by means of gel-permeation chromatography (GPC) and it was found that the …

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