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2002

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A Factorization Approach For Solving The Hamilton-Jacobi Equations In Nonlinear Optimal Control, Mohammad Dikko Aliyu Jan 2002

A Factorization Approach For Solving The Hamilton-Jacobi Equations In Nonlinear Optimal Control, Mohammad Dikko Aliyu

LSU Doctoral Dissertations

The Hamilton-Jacobi equation (HJE) arose early in the last century in the study of the calculus of variation, classical mechanics and Hamiltonian systems. Recently, there has been a renewed interest in HJEs arising in various analysis and synthesis problems in systems theory. The HJE despite providing a necessary and sufficient condition for an optimal control, is very difficult to solve for general nonlinear systems, and therefore its application remained limited to linear systems. Yet, the HJE has been studied extensively in the literature from diverse areas of science and engineering, varying from mathematical physics, to mechanics, control theory, and to …

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Nutrient Profile, Functional Properties, And Microstructure Of Dried Waste Milk Products For Use As A Potential Animal Feed, Ronald I. Thompson Jan 2002

Nutrient Profile, Functional Properties, And Microstructure Of Dried Waste Milk Products For Use As A Potential Animal Feed, Ronald I. Thompson

LSU Doctoral Dissertations

A study was conducted to determine the feasibility of concentrating the wastewater of a butter/powder factory for use as an animal feed. Two concentrated products were evaluated: recovered milk product (RMP), which is the direct factory waste stream; and formulated recovered milk product (FRMP), which is a product made by combining RMP and separator de-sludge in a 3:1 ratio. Three pilot scale dryer systems were used to concentrate the product: a spray dryer, a roller dryer, and a pulse combustion dryer. Dried samples were analyzed for fat, moisture, protein, ash, nitrates, chloride, pH, calcium, phosphorus, sodium and amino acids. Values …

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Dynamic Modeling And Analysis Of Oscillatory Bioreactors, Yongchun Zhang Jan 2002

Dynamic Modeling And Analysis Of Oscillatory Bioreactors, Yongchun Zhang

LSU Doctoral Dissertations

Dynamic modeling of bioreactors is a challenging problem. The complexity of first principle models also make model validation and analysis very difficult and model-based controller design practically intractable. This thesis has focused on finding an effective tool for model dynamic analysis, construction of low-dimension model and simple and effective controller design. The validity of a biochemical reactor model often is evaluated by comparing transient responses to experimental data. Dynamic simulation can be rather inefficient and ineffective for analyzing bioreactor model. Bifurcation analysis is found to be a powerful tool for obtaining a more efficient and complete characterization of the model …

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The Culture Of Crime: Representations Of The Criminal In Eighteen-Century England, Daniel Gonzalez Jan 2002

The Culture Of Crime: Representations Of The Criminal In Eighteen-Century England, Daniel Gonzalez

LSU Doctoral Dissertations

This dissertation explores how literary criminal narratives reflected public anxieties over the increasing commercialization of England during the early eighteenth century. It accounts for the popularity of the criminal in literature as well as public concerns about commercialization and the individuality it encouraged, revealing how these concerns were expressed in the most popular form of criminal narrative in this era, the criminal biography. Chapters on the criminal narratives of John Bunyan, Daniel Defoe and John Gay reveal how the criminal narrative functioned as a means of critiquing a developing commercial society in England. Bunyan first employs the formula of the …

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Markov Models To Estimate And Describe Survival Time And Experience In Cohorts With High Euthanasia Frequency, Giselle Louise Hosgood Jan 2002

Markov Models To Estimate And Describe Survival Time And Experience In Cohorts With High Euthanasia Frequency, Giselle Louise Hosgood

LSU Doctoral Dissertations

Unique to survival analysis of veterinary clinical data is classification of observations from euthanized animals. The first study highlighted limitations of Kaplan-Meier product limit analysis (KM) of veterinary clinical data. Three data sets with different outcome proportions (alive, lost-to-follow-up, dead due to disease, dead due to other, euthanized due to disease, euthanized due to other) were used. Different classifications of observations from euthanized animals caused inconsistent conclusions of significant differences between strata within data sets. At times, ranking of median survival time estimates for strata was reversed. The KM was found inappropriate to evaluate observations from euthanized animals. This finding, …

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Virtual Auctions, Han Chooi Louis Tan Jan 2002

Virtual Auctions, Han Chooi Louis Tan

Student Works (2000-2009)

Virtual Auctions is about developing an e-auction system for online auctioning off general merchandise to bidders in specialized auctions such as travel auction, computer auction, car auction, etc. The system will allow bidders to do online registration and bidding, which could be for auctioning off many interesting, bizarre and exciting items such as watches, antiques etc. In the development of this system, there are several stages involved, which we will see in the following chapters of this report. Firstly there will be an Introduction chapter where the objectives and scope of this project is determined. Also there is a part …

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Sistem Pengurusan Pelajar (Student Administation System-Sas), Mohd Jumari Masdianilavati Jan 2002

Sistem Pengurusan Pelajar (Student Administation System-Sas), Mohd Jumari Masdianilavati

Student Works (2000-2009)

Sistem Pengurusan Pelajar berasaskan web untuk pelajar Fakulti Sains Komputer dan Teknologi Maklumat merupakan aplikasi berasaskan web untuk kegunaan kakitangan dan pelajar FSKTM. Projek tesis ini diharapkan dapat membantu operasi, pengurusan dan pentadbiran fakulti. Ia juga diharapkan untuk meneruskan perkembangan maklumat di kalangan komuniti di mana ianya akan memudahkan akses dan capaian kembali maklumat dan juga pencarian maklumat. Dengan internet, maklumat boleh disebarkan dengan cepat, efektif dan efisyen mengatasi rintangan geografi. Tapak web FSKTM telah dibangunkan untuk membekalkan tapak web yang dinamik dengan fungsian untuk melaksanakan pengemaskinian secara atas talian di samping membekalkan maklumat yang diperlukan dan terkini dengan cara …

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Sistem Informasi Tajaan Pengajian (Sitp), Awangku Kasumajaya Awangku Fadzillah Jan 2002

Sistem Informasi Tajaan Pengajian (Sitp), Awangku Kasumajaya Awangku Fadzillah

Student Works (2000-2009)

Projek Ilmiah pada dasarnya adalah ditarifkan sebagai penyediaan projek tesis tahun akhir bagi pelajar Fakulti Sains Komputer Dan Teknologi Maklumat bagi tujuan memenuhi keperluan pengijazahan Sarjana Muda Sains Komputer. Matlamat utama projek ilmiah adalah untuk pelajar mengaplikasikan segala konsep dan skil yang telah dipelajari untuk menghasilkan projek yang benar-benar bermutu tinggi. Bagi tujuan ini saya telah memilih untuk membangunkan sistem yang berasaskan web iaitu Sistem Informasi Tajaan Pengajian (SITP). Sistem SITP ini dibangunkan secara projek berkumpulan. Seramai 3 orang pelajar akan membangunkan projek ini berdasarkan kepada submodul yang telah ditetapkan iaitu permohonan pinjman atas talian, penasihat pelajaR, FAQS, penyemakan penyata …

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A New Optimal Nonlinear Control Method And Its Application To Missile Guidance Law Design, Ming Xin, S. N. Balakrishnan Jan 2002

A New Optimal Nonlinear Control Method And Its Application To Missile Guidance Law Design, Ming Xin, S. N. Balakrishnan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

In this paper, a new nonlinear control synthesis technique (q-D approximation) is discussed. By adding perturbations to the cost function this approach achieves a suboptimal solution to the Hamilton-Jacobi- Bellman (HJB) equation. By manipulating the perturbation terms both asymptotic stability and optimality properties are obtained. An application to the design of missile guidance law is presented and is compared with a similar technique (State Dependent Riccati Equation technique) used in problems of this class. © 2002 by the author(s).

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State Dependent Riccati Equation Based Spacecraft Attitude Control, Ming Xin, S. N. Balakrishnan Jan 2002

State Dependent Riccati Equation Based Spacecraft Attitude Control, Ming Xin, S. N. Balakrishnan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

We present a new optimal control approach to the robust spacecraft attitude control in the framework of State Dependent Riccati Equation (SDRE) technique. To treat this highly nonlinear control system, we formulate it as a nonlinear optimal regulator problem. SDRE technique was well applied to this class of attitude control problem. We also synthesize a neural network based extra controller to achieve the robustness in the presence of the parameter uncertainties. A general spacecraft attitude regulation problem was studied to show the effectiveness of SDRE approach and robust extra control design. © 2002. Published by the American Institute of Aeronautics …

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Accuracy And Efficiency In Fem Modeling Of Turbofan Acoustic Radiation, Eivind Listerud, Walter Eversman Jan 2002

Accuracy And Efficiency In Fem Modeling Of Turbofan Acoustic Radiation, Eivind Listerud, Walter Eversman

Mechanical and Aerospace Engineering Faculty Research & Creative Works

It is shown that there is an increase in efficiency of acoustic radiation finite element modeling with the incorporation of cubic rather than quadratic serendipity elements. Cubic serendipity elements produce a given level of accuracy for acoustic pressure using a coarser mesh than required using quadratic elements, thus decreasing the CPU time needed for accurate modeling. These elements have been applied to the near field inlet and aft acoustic radiation models for a turbofan engine with the result of considerable reduction in the dimensionality of the problem without sacrificing accuracy. Visual observations of the gain in computational efficiency is supported …

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Cfd Simulations Of Critical Components In Fuel Filling Systems, R. Banerjee, X. Bai, D. Pugh, Kakkattukuzhy M. Isaac, D. Klein, J. Edson, W. Breig, L. Oliver Jan 2002

Cfd Simulations Of Critical Components In Fuel Filling Systems, R. Banerjee, X. Bai, D. Pugh, Kakkattukuzhy M. Isaac, D. Klein, J. Edson, W. Breig, L. Oliver

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A comprehensive study is reported on the dynamics of critical components in the refueling process for passenger cars and light trucks. Nozzle, filler pipe, recirculation tube, tank, and canister are investigated. CFD simulations are conducted for flow rates of 4 liters/min (lpm) to 80 lpm for gasoline and up to 120 lpm for diesel fuel. Tank pressure, identified as a critical parameter controlling flow performance, is measured and utilized as a boundary condition. Flow simulation in a carbon canister, accomplished by treating the adsorbing carbon as a porous medium, indicates pressure drops which are in good agreement with published experimental …

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Proper Orthogonal Decomposition Based Optimal Control Design Of Heat Equation With Discrete Actuators Using Neural Networks, Radhakant Padhi, S. N. Balakrishnan Jan 2002

Proper Orthogonal Decomposition Based Optimal Control Design Of Heat Equation With Discrete Actuators Using Neural Networks, Radhakant Padhi, S. N. Balakrishnan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A new method is presented for the optimal control design of one-dimensional heat equation with the actuators being concentrated at discrete points in the spatial domain. This systematic methodology incorporates the advanced concept of proper orthogonal decomposition for the model reduction of distributed parameter systems. After deigning a set of problem-oriented basis functions an analogous optimal control problem in the lumped domain is formulated. The optimal control problem is then solved in the time domain, in a state feedback sense, following the philosophy of adaptive critic neural networks. The control solution is then mapped back to the spatial domain using …

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A Quantitative Similarity Metric For Design-By-Analogy, Daniel A. Mcadams, Kristin L. Wood Jan 2002

A Quantitative Similarity Metric For Design-By-Analogy, Daniel A. Mcadams, Kristin L. Wood

Mechanical and Aerospace Engineering Faculty Research & Creative Works

During the design and development of new products, design engineers use many techniques to generate and define new and "good" concepts. Inherent in this search for solutions is the conscious and unconscious reliance on prior experience and knowledge, or design-by-analogy. In this paper, a quantitative metric for design-by-analogy is developed. This metric is based on the functional similarity of products. By using this product-similarity metric, designers are able to formalize and quantify design-by-analogy techniques during concept and layout design. The methods, as developed in this paper, allow a designer with limited experience to develop sophisticated solutions that enhance the overall …

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A Functional Basis For Engineering Design: Reconciling And Evolving Previous Efforts, Julie Hirtz, Robert B. Stone, Daniel A. Mcadams, Simon Szykman, Kristin L. Wood Jan 2002

A Functional Basis For Engineering Design: Reconciling And Evolving Previous Efforts, Julie Hirtz, Robert B. Stone, Daniel A. Mcadams, Simon Szykman, Kristin L. Wood

Mechanical and Aerospace Engineering Faculty Research & Creative Works

In engineering design, all products and artifacts have some intended reason behind their existence: the product or artifact function. Functional modeling provides an abstract, yet direct, method for understanding and representing an overall product or artifact function. Functional modeling also strategically guides design activities such as problem decomposition, physical modeling, product architecting, concept generation, and team organization. A formal function representation is needed to support functional modeling, and a standardized set of function-related terminology leads to repeatable and meaningful results from such a representation. We refer to this representation as a functional basis; in this paper, we seek to reconcile …

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Ethnography And The Idealized Accounts Of Science In Law, David S. Caudill Jan 2002

Ethnography And The Idealized Accounts Of Science In Law, David S. Caudill

San Diego Law Review

n Part I, I confirm the idealizations of science in law and their implications for legal scholarship and practice. In Part II, I describe the ethnographic method used by science studies scholars, with reference to my own ethnographic analysis of interviews with three neuroscientists. I conclude Part II by identifying various social aspects of science that comprise a complex picture of scientific activity. In Part ill, I discuss the implications of ethnomethodology for trial practice, including deposition analysis, Daubert-type hearings, cross-examination techniques, and drafting jury instructions. Part IV addresses anticipated criticisms of my arguments.

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The Purloined Personality: Consumer Profiling In Financial Services Jan 2002

The Purloined Personality: Consumer Profiling In Financial Services

San Diego Law Review

Although almost every sector of the U.S. economy practices consumer profiling,perhaps the most substantive challenge to consumer privacy is found in the activities surrounding the use and disclosure of consumer transaction data by the financial services industry. For that reason, this Comment focuses exclusively on consumer profiling in the context of the financial services sector, defined as banks, credit card issuers, brokerages, and insurance companies.

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Sistem Informasi Tajaan Pengajian (Sitp) Untuk Kegunaan Hal-Ehwal Pelajar Um, Zainal Abidin Zainul Azhar Jan 2002

Sistem Informasi Tajaan Pengajian (Sitp) Untuk Kegunaan Hal-Ehwal Pelajar Um, Zainal Abidin Zainul Azhar

Student Works (2000-2009)

Pandangan Pertama SITP, Sistem Informasi Tajaan Pengajian (SITP) adalah sebuah sistem atas talian yang akan dibangunkan untuk Bahagian Hal-Ehwal Pelajar Universiti Malaya. Sistem in akan; • merapatkan jurang komunikasi antara HEP dengan para pelajar • menjadi sumber pencarian maklumat berkaitan dengan penajaan pengajian • memudahkan segala urusan pelajar berkaitan dengan penajaan pengajian • memudahkan urusan Sahagian Hai-Ehwal Pelajar disamping menghasilkan operasian lebih efektif Laporan ini akan memberi pengenalan kepada projek pembangunan sistem ini dari aspek • penyelidikan • analisa • rekabentuk Sistem ini akan dibangunkan oleh tiga pelajar tahun akhir FSKTM jurusan Kejuruteran Perisian sebagai projek tesis (WXES3181) tahun akhir …

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Experimental Implementation Of Adaptive-Critic Based Infinite Time Optimal Neurocontrol For A Heat Diffusion System, Prashant Prabhat, S. N. Balakrishnan, Dwight C. Look Jan 2002

Experimental Implementation Of Adaptive-Critic Based Infinite Time Optimal Neurocontrol For A Heat Diffusion System, Prashant Prabhat, S. N. Balakrishnan, Dwight C. Look

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Recently the synthesis methodology for the infinite time optimal neuro-controllers for PDE systems in the framework of adaptive-critic design has been developed. In this paper, first we model an experimental setup representing one dimensional heat diffusion problems. Then we synthesize and implement an adaptive-critic based neuro-controller for online temperature profile control of the experimental setup.

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Motion Based Event Recognition Using Hmm, Gu Xu, Yu-Fei Ma, Hong-Jiang Zhang, Shiqiang Yang Jan 2002

Motion Based Event Recognition Using Hmm, Gu Xu, Yu-Fei Ma, Hong-Jiang Zhang, Shiqiang Yang

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Motion is an important cue for video understanding and is widely used in many semantic video analyses. We present a new motion representation scheme in which motion in a video is represented by the responses of frames to a set of motion filters. Each of these filters is designed to be most responsive to a type of dominant motion. Then we employ hidden Markov models (HMMs) to characterize the motion patterns based on these features and thus classify basketball video into 16 events. The evaluation by human satisfaction rate to classification result is 75%, demonstrating effectiveness of the proposed approach …

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Proper Orthogonal Decomposition Based Feedback Optimal Control Synthesis Of Distributed Parameter Systems Using Neural Networks, Radhakant Padhi, S. N. Balakrishnan Jan 2002

Proper Orthogonal Decomposition Based Feedback Optimal Control Synthesis Of Distributed Parameter Systems Using Neural Networks, Radhakant Padhi, S. N. Balakrishnan

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A new method for optimal control design of distributed parameter systems is presented in this paper. The concept of proper orthogonal decomposition is used for the model reduction of distributed parameter systems to form a reduced order lumped parameter problem. The optimal control problem is then solved in the time domain, in a state feedback sense, following the philosophy of ''adaptive critic'' neural networks. The control solution is then mapped back to the spatial domain using the same basis functions. Numerical simulation results are presented for a linear and nonlinear one-dimensional heat equation problem in an infinite time regulator framework.

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Nursing Students' Knowledge, Observation Of Environmental Risk Factors And Compliance With Recommended Precautions For The Prevention Of Transmission Of Infectious Diseases By Needlestick Injury, Cynthia Ann Logan Jan 2002

Nursing Students' Knowledge, Observation Of Environmental Risk Factors And Compliance With Recommended Precautions For The Prevention Of Transmission Of Infectious Diseases By Needlestick Injury, Cynthia Ann Logan

LSU Doctoral Dissertations

The primary purpose of this study was to determine the relationships between selected institutional and personal demographic factors, knowledge, observation of environmental risk factors, and the degree of nursing student compliance with standard and transmission-based precautions for the prevention of transmission of infectious diseases. A four part, 89 item questionnaire was administered to students enrolled in clinical courses at three associate degree and four baccalaureate nursing programs in order to measure knowledge, compliance, environmental risk factors, and demographics. Useable data was collected from 710 nursing students enrolled in clinical courses. The typical respondent was female, between the ages of 20 …

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Three-Dimensional Micromachined On-Chip Inductors For High Frequency Applications, Nimit Chomnawang Jan 2002

Three-Dimensional Micromachined On-Chip Inductors For High Frequency Applications, Nimit Chomnawang

LSU Doctoral Dissertations

Demands for wireless communication are ever-escalating for consumer and military communication applications. The requirements of portability, more functionality and lower cost have been driving forces toward smaller, more sophisticated and flexible wireless devices with lower power consumption. To meet these requirements, monolithically integrated passive inductors with high Q-factors and high self-resonant frequencies are desirable. Q-factor and self-resonant frequency of an inductor are significantly degraded at high frequencies due to conductor ohmic loss, magnetically induced eddy current in the conductive substrate, and lower self-resonant frequency from capacitance between conductive substrate and conductors.
In this dissertation, novel three-dimensional arch-like solenoid and dome-shaped …

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Apparatus For Comminution Of Solid Materials Using A Processor-Controlled Liquid Jet, Marian Mazurkiewicz Jan 2002

Apparatus For Comminution Of Solid Materials Using A Processor-Controlled Liquid Jet, Marian Mazurkiewicz

Mining Engineering Faculty Research & Creative Works

The present invention is directed to a tire comminution apparatus that is of simple construction and that can be operated without excessive maintenance. According to the present invention, a vehicle tire of any size or composition can be comminuted with essentially the same comminution apparatus. The comminution apparatus includes a freely moving lance with a nozzle for transforming a liquid into a high velocity liquid jet. The lance is positioned and controlled such that the liquid jet impacts the tire thereby separating it into its component parts. The comminution apparatus may be computer controlled.

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Graphite Platelet Nanostructures, Marian Mazurkiewicz Jan 2002

Graphite Platelet Nanostructures, Marian Mazurkiewicz

Mining Engineering Faculty Research & Creative Works

Separated graphite nanostructures are formed of thin graphite platelets having an aspect ratio of at least 1,500:1. The platelets have an angular geometric structure and may be fully independent from an original graphite particle, or partially attached to the particle. The graphite platelets have an average thickness in the range of 1-100 nm. The graphite nanostructures are created from synthetic or natural graphite using a high-pressure mill. Fluid jets of the high-pressure flaking mill cause fluid to enter the tip of cracks in the graphite particles, which creates tension at the tip. This tension causes the cracks to propagate along …

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The Causes Of Armature Surface Fracturing Within Helical Flux-Compression Generators, Jason Baird, Paul Nicholas Worsey Jan 2002

The Causes Of Armature Surface Fracturing Within Helical Flux-Compression Generators, Jason Baird, Paul Nicholas Worsey

Mining Engineering Faculty Research & Creative Works

Aluminum and copper tubes filled with explosive were tested during this study of high strain rate effects, as an adjunct to helical flux-compression generator research at the University of Missouri-Rolla, directly affecting the understanding of flux cutoff and high strain-rate changes in generator armatures. Longitudinal cracks characteristically developed in the outer surface of armatures at a smaller expansion ratio than predicted. These cracks occurred within two diameters of the detonator end of the armature but did not extend when the tubing expanded under explosive pressurization. Such cracks appear to cause magnetic flux cutoff, and flux losses seriously affect energy conversion …

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Sistem Inventori Perkakasan Sekolah: Kajian Kes Di Sekolah Menengah Kebangsaan Tengku Ampuan Jemaah Pelabuhan Kelang, Amiruddin Asfalela Jan 2002

Sistem Inventori Perkakasan Sekolah: Kajian Kes Di Sekolah Menengah Kebangsaan Tengku Ampuan Jemaah Pelabuhan Kelang, Amiruddin Asfalela

Student Works (2000-2009)

Perkembangan teknologi dan industri komputer yang semakin pesat, kini menjadi medan utama untuk setiap pihak bersaing. Penyediaan aspek mudah dan pantas menjadi pilihan utama dalam menghasilkan kerja yang mempunyai produktiviti yang berkualiti serta hasil kerja yang terbaik. Perkembangan yang positif ini membantu meningkatkan mutu pengurusan termasuk pengurusan inventori. Sistem Inventori Perkakasan Sekolah yang dibangunkan ini bertujuan untuk membantu kakitangan yang bertugas dalam melicinkan tugas-tugasnya dan membantu mengatasi masalah yang dihadapi ketika kaedah manual digunakan. Sistem ini direkabentuk untuk memenuhi segala keperluan yang wujud dalam aliran suatu inventori. Penyediaan suatu sistem kerja yang lebih produktif membantu kakitangan dalam mengendalikan keluar masuk …

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Student Marks Management System (Smms), Chee Choong Tan Jan 2002

Student Marks Management System (Smms), Chee Choong Tan

Student Works (2000-2009)

Today, information technology has provided into almost every industry in the country. Institutions and Universities today are moving towards paperless environment and computerized their current systems to ensure smoother operations in the daily running operation. Student Marks Management System (SMMS) is introduced as to give a new impulse for the Institution and Universities to gain competitive advantages. SMMS is a web-based system develops with the objectives to computerized the current students' marks management system that are using in FSKTM. Besides, SMMS also defines the current problems that are facing by the user to ensure the proposed system will overcome these …

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Agglomerated Lubricant, Mary R. Reidmeyer Jan 2002

Agglomerated Lubricant, Mary R. Reidmeyer

Materials Science and Engineering Faculty Research & Creative Works

A lubricant for use in lubricating the shot sleeve of a machine for die casting molten metals is in the form of agglomerated particles. The particles have an inorganic high pressure lubricant agglomerated, with a binder material and with an organic material. The solid lubricant is resistant to dusting, caking and breakage, can be fed through an automatic dispensing machine, and combines inorganic and organic materials to achieve excellent lubrication properties. The product has low flash and low smoke release into the environment.

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Hydrothermal Deposition And Characterization Of Heteroepitaxial Batio₃ Films On Srtio₃ And Laalo₃ Single Crystals, Emin Ciftci, M. N. Rahaman, Frank D. Blum Jan 2002

Hydrothermal Deposition And Characterization Of Heteroepitaxial Batio₃ Films On Srtio₃ And Laalo₃ Single Crystals, Emin Ciftci, M. N. Rahaman, Frank D. Blum

Materials Science and Engineering Faculty Research & Creative Works

Heteroepitaxial BaTiO3 thin films were deposited in an aqueous solution under hydrothermal conditions on single crystal substrates of (100) SrTiO3 and (012) LaAlO3. The reactants consisted of fine TiO2 particles in a strongly alkaline solution of Ba(OH)2 at a temperature of 150°C. The growth of the films was studied by atomic force microscopy, high resolution scanning electron microscopy, and X-ray diffraction. The formation of the films occurred by nucleation of {001} faceted islands followed by three-dimensional growth of the islands to cover the substrate. Repeated hydrothermal treatment improved the film thickness and the surface coverage …

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