Digital Commons Network^™

A Buffered Advection/Dispersion Lake Water Quality Transport Framework For Modeling Lake Gaston Pipeline Intake Water Withdrawal, Lloyd Ashton Gatling

Civil & Environmental Engineering Theses & Dissertations

Water quality response to reservoir water withdrawal is investigated in Pea Hill Arm of Lake Gaston, a non-tidal reservoir tributary, where the point of water withdrawal is in an upstream tributary and influences the direction of tributary flow causing longitudinal velocity null flow conditions to occur. The study also focuses on control of withdrawal rate and timing to optimize both quality of water remaining in the tributary and quantity of water that can be safely withdrawn.

Research was conducted assuming steady state conditions and later under spatial and temporal variability experienced in the reservoir with main lake pool elevation fluctuations …

Process Flow Optimization Studies Through Discrete Event Simulation, Milind Chokshi

Electrical & Computer Engineering Theses & Dissertations

Computer-aided simulation has begun to emerge as a powerful tool for numerical analysis of the behavior and anticipated performance of industrial systems and their optimization. Applications include materials handling, storage and controls systems, prediction of manufacturing efficiencies, and production optimization. Simulations are used to test baseline models and subsequently analyze new production concepts, operating strategies, and planned procedures prior to costly implementation.

The study of process flows in a manufacturing environment is difficult due to its inherent stochastic nature. Breakdown of the sub-systems and failures of machines is a random process and needs to be solved based on concepts of …

Curvilinear Interface Methodology For Finite-Element Applications, Ollie James Rose

Mechanical & Aerospace Engineering Theses & Dissertations

Recent trends in design and manufacturing suggest a tendency toward multiple centers of specialty which results in a need for improved integration methodology for dissimilar finite element or CFD meshes. Since a typical finite element or CFD analysis requires about 50% of an engineers effort to be devoted to modeling and input, there is a need to advance the state-of-the-art in modeling, methodology. These two trends indicate a need to for the capability to combine independently-modeled configurations in an automated and robust way without the need for global remodeling. One approach to addressing this need is the development of interfacing …

Diffusion Problems In Wound Healing And A Scattering Approach To Immune System Interactions, Julia Suzanne Arnold

Mathematics & Statistics Theses & Dissertations

A theoretical model for the existence of a Critical Size Defect (CSD) in certain animals is the focus of the majority of this dissertation. Adam [1] recently developed a one-dimensional model of this phenomenon, and chapters I–V address the exist the CSD in a two-dimensional model and a three-dimensional model. The two dimensional (or 1-d circular) model is the more appropriate for a study of CSD's. In that model we assume a circular wound of uniform depth and develop a time-independent form of the diffusion equation relevant to the study of the CSD phenomenon. It transpires that the range of …

Photodegradation Of Pcbs In Natural Waters, Adriana R. Nicolaescu

Masters Theses

PCBs are widely distributed in the environment and they are biologically refractory and toxic compounds. There is great interest in understanding their fate in the environment, and also for finding safe and effective degradation methods.

This study is concerned with the photodegradation of four PCB congeners: PCB 5, PCB 18, PCB 77, PCB 128 in natural waters. Natural waters contain humic substances which can greatly influence the environmental fate of the PCBs. The different degradation of the four congeners was studied in standardized systems and in humic acid or nitrate solutions, under environmental conditions. DMDE and Methoxyclor (whose environmental half-lifetimes …

Wavelength Modulation Spectroscopy Of Water Vapor And Line Center Stabilization At 1.462 Μm For Lidar Applications, Colleen Marie Fitzgerald

Electrical & Computer Engineering Theses & Dissertations

Wavelength modulation spectroscopy was employed to investigate water vapor absorption lines in the 1.462 µm wavelength region using an external-cavity diode laser. These measurements were necessary in the development of a lidar (light detection and ranging) instrument for differential absorption measurement of the concentration and movement of water vapor in the Earth's atmosphere. Differential absorption measurements require that the laser frequency remain stable throughout the duration of the measurement. To ensure this stability, the laser output wavelength is monitored and a feedback control loop set up to minimize laser line drift. Three lines were investigated in the 1.462 µm region. …

Theory Of Sic Schottky Barrier Conduction And Model Analysis For Diode Breakdown With And Without Screw Dislocations, Lifeng Zheng

Electrical & Computer Engineering Theses & Dissertations

Silicon Carbide is a very promising candidate for applications in high-power, high-temperature, and high-radiation conditions under which conventional semiconductors cannot perform adequately. However, the SiC processing technology has not yet reached maturity. There is also limited knowledge of its physical and chemical characteristics, and its device behavior is not well understood. The aim of this thesis is to analyze two specific problems in the SiC area. The first issue involves the large discrepancy between experimental I - V characteristics of SiC Schottky diodes and their theoretical values. The observed data, especially at low voltages, is found to be orders of …

A Grateful Response To Comments On Framing Environmental Policy Instrument Choice, Kenneth R. Richards

Duke Environmental Law & Policy Forum

No abstract provided.

The Unenvisaged Case, Interpretive Progression, And The Justiciability Of Title Vii Same-Sex Sexual Harassment Claims, Ronald Turner

Duke Journal of Gender Law & Policy

No abstract provided.

The Interplay Between The Surface Band Structure And Possible Surface Reconstructions Of Mo(112), T. Mcavoy, Jun Zhang, C. Waldfried, D.N. Mcilroy, Peter A. Dowben, O. Zeybek, T. Bertrams, S.D. Barrett

Peter Dowben Publications

The experimental band structure of Mo(112) and the effects by temperature and adsorbate are presented. A surface resonance, identified as crossing the Fermi level at about 1/3 from Γ̅ to Χ̅ of surface Brillouin zone, was observed to be very sensitive to both contamination and temperature. We find evidence of adsorbate and temperature induced reconstruction of the Mo(112) surface. Examination of low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM) data provides evidence for an adsorbate induced reconstruction of the Mo(112) surface with periodicities consistent with the Fermi level crossingThe experimental band structure of Mo(112) and the effects by temperature …

สัมภาษณ์ : นายชาตรี ช่วยประสิทธิ์ อธิบดีกรมส่งเสริมคุณภาพสิ่งแวดล้อม การปรับโครงการกรมส่งเสริมคุณภาพสิ่งแวดล้อม เป็นกรมส่งเสริมเทคโนโลยีและสิ่งแวดล้อม, ชัยรัตน์ วงศ์กิจรุ่งเรือง, ชญานิน อรุณมาศ

Thai Environment

No abstract provided.

ประเทศไทย กับกฎหมาย ระหว่างประเทศ, พรชัย ด่านวิวัฒน์

Thai Environment

เนื่องจากสิ่งแวดล้อมเป็นหัวข้อหนึ่งที่มีการกล่าวถึงกันอย่างกว้างขวาง และปัจจุบันก็มีการรณรงค์เกี่ยวกับ การรักษาคุณภาพสิ่งแวดล้อมกันอย่างมาก ทั้งในกรุงเทพมหานครและในต่างจังหวัด ดังจะเห็นได้จากการที่กรุงเทพมหานครพยายามขอความร่วมมือในการลดมลพิษในถนนบางสายในกรุงเทพมหานครบางช่วงระยะเวลา โดยให้รถยนต์ที่มีคนนั่งน้อยกว่าสองคนหลีกเลี่ยงไปใช้เส้นทางอื่นแทน ซึ่งผลการทดลองปรากฏว่าน่าพอใจ หรือการ ที่มีการเดินขบวนต่อต้านการวางท่อก๊าซธรรมชาติจากแหล่งยาดานาในสหภาพพม่าเข้ามายังประเทศไทย รวมทั้ง การวางท่อก๊าซธรรมชาติจากพื้นที่พัฒนาร่วมไทย-มาเลเซีย เข้ามายังฝั่งไทยแล้วออกไปยังประเทศมาเลเซีย จึงน่าที่จะศึกษากันในเบื้องต้นว่ากฎหมายระหว่างประเทศได้วางหลักวางเกณฑ์อย่างไรในเรื่องสิ่งแวดล้อมไว้บ้าง นอกเหนือไปจากหลักเกณฑ์ที่จะพบได้จากกฎหมายภายในของแต่ละประเทศ ซึ่งในกรณีของไทยก็ได้แก่ พระราชบัญญัติส่งเสริมและรักษาคุณภาพสิ่งแวดล้อมแห่งชาติ พ.ศ. 2535 รวมทั้งพระราชบัญญัติอื่นๆ ที่มี บทบัญญัติในเรื่องสิ่งแวดล้อม อาทิ พระราชบัญญัติเดินเรือในน่านน้ำไทย พ.ศ. 2456 อย่างไรก็ดี เพื่อให้บทความนี้กระชับและเพื่อเป็นพื้นฐานสำหรับบางท่านที่สนใจเรื่องกฎหมายสิ่งแวดล้อม ระหว่างประเทศ บทความนี้จะกล่าวถึงความหมายและขอบเขตของกฎหมายสิ่งแวดล้อมในตอนที่ 2 จากนั้น จะกล่าวถึงบ่อเกิดหรือแหล่งที่มาของกฎหมายสิ่งแวดล้อมระหว่างประเทศในตอนที่ 3 ส่วนตอนที่ 4 จะกล่าวถึงหลัก กฎหมายสิ่งแวดล้อมระหว่างประเทศ ในส่วนที่ 5 จะกล่าวถึงแนวโน้มของการทำเรื่องกฎหมายสิ่งแวดล้อมมาเป็น เครื่องมือในการกีดกันทางการค้าระหว่างประเทศ สำหรับตอนที่ 6 ซึ่งเป็นบทส่งท้ายจะกล่าวถึงผลกระทบของ ประเทศไทยจากกฎหมายสิ่งแวดล้อมระหว่างประเทศ

สถานการณ์ด้านมลพิษ ของประเทศไทย ปี 2542, กรมควบคุมมลพิษ

Thai Environment

No abstract provided.

ถังรองรับมูลฝอยสาธารณะ กับ การคัดแยกมูลฝอย, กัลยา สุนทรวงศ์สกุล

Thai Environment

No abstract provided.

ข่าวสิ่งแวดล้อม

Thai Environment

No abstract provided.

แนะนำโครงการของสถาบันวิจัยสภาวะแวดล้อม : โครงการฝึกอบรม การประเมินผลกระทบสิ่งแวดล้อม (Environmental Impact Assessment : Eia), พักตร์วิมล เพียรล้ำเลิศ

Thai Environment

No abstract provided.

Sedimentology, Palynology, And Sea Level Fluctuations Recorded From Two Pennsylvanian Cores From Northwestern Missouri, Elizabeth J. Morris, Francisca Oboh-Ikuenobe

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Two cores from Buchanan and Andrew Counties in the Forest City Basin, northwestern Missouri, yielded approximately 1,200 feet of sedimentary rock deposited during the Pennsylvanian Period (approximately 300 million years ago), a period characterized by rapid fluctuations in sea level. The cores were logged from the Excello Formation in the Upper Desmoinesian Series upward to the Iatan Formation at the top of the Missourian Series. Lithofacies were identified from rock composition, grain size, color, bedding thickness, sedimentary structures, and fossils. Petrographic thin sections were taken from selected rock types and the results were used to complement the visual descriptions. Limestones …

Development Of Leadership Skills: Experience And Timing, Michael D. Mumford, Michelle A. Marks, American Institutes For Research, Stephen J. Zaccaro, Roni Reiter-Palmon

Psychology Faculty Publications

To develop organizational leaders we need to understand how requisite skills are acquired over the course of people's careers. In this article, a cross-sectional design was used to assess differences in leadership skills across six grade levels of officers in the U.S. Army. Increased levels of knowledge, problem-solving skills, systems skills, and social skills were found at higher grade levels. Certain skills and experiences, however, were found to be particularly important at certain phases of leaders' careers. These findings are used to propose an organization-based model of skill development. Implications of this model for leader development programs are discussed.

Nova Quarterly: The University Of Texas At El Paso, The University Of Texas At El Paso University Communications

NOVA

Spring 2000, Vol. 36, No. 3.; No. 141

Educating the Next Generation

Water Resources Review - Spring 2000 Vol 13 No 1, Annis Water Resources Institute

AWRI Reviews

No abstract provided.

Thermal Degradation Of Cross-Linked Polyisoprene And Polychloroprene, David D. Jiang, Galina F. Levchik, Sergei V. Levchik, Caroline Dick, John J. Liggat, C.E. Snape, Charles A. Wilkie

Chemistry Faculty Research and Publications

Polyisoprene and polychloroprene have been cross-linked either in solution or in solid state using free radical initiators. In the comparable experimental conditions higher cross-linking density was observed in the solid state process. Independent of the cross-linking method, polychloroprene tended to give a higher gel content and cross-link density than does polyisoprene. Infrared characterization of the cross-linked materials showed cis-trans isomerization occurred in the polyisoprene initiated by benzoyl peroxide, whereas no isomerization was found in the samples initiated by dicumyl peroxide. Polyisoprene does not cross-link by heating in a thermal analyzer, whereas polychloroprene easily undergoes cross-linking in such conditions. Infrared …

Circulation, Vol. 7, No. 2, Center For Coastal Physical Oceanography, Old Dominion University, Bettina Fach

CCPO Circulation

Spring 2000 issue of CCPO Circulation featuring article "Cruising the Southern Ocean" by Bettina Fach

Aku Newsletter : April 2000, Volume 1, Issue 2, Aga Khan University

The Aga Khan University Newsletters

No abstract provided.

Multivariate Analysis Of Risk Factors Associated With Genital Ulcer Disease Among Incarcerated Males In Sindh, S Akhtar, S P. Luby, M H. Rahbar

Community Health Sciences

Objective: To evaluate the potential risk behaviors associated with the lifetime risk of self reported genital ulcer disease (GUD) among prison inmates.SETTING: Prison inmates from 14 prisons of Sindh Province.Methods: A cross-sectional study was conducted on 3395 prison inmates during July to December, 1994. A questionnaire was used to assess the lifetime risk of self-reported GUD (whether or not the subject was ever affected with GUD up to present age) and to investigate demographic markers and risk behaviors for their possible association with lifetime risk of GUD using logistic regression analysis.Results: The reported lifetime risk of GUD in the study …

2000 April, Office Of Communications & Marketing, Morehead State University.

Morehead State Press Release Archive, 1961 to the Present

Morehead State University press releases for April of 2000.

Honors Program Newsletter, Spring 2000, Illinois State University, Honors Program

Honors Program Newsletter

Honors Program Newsletter

Improving Co-Generation Plant Performance Using Computer Modeling Software: A Parametric Study, Gerald R. Munyan

Mechanical & Aerospace Engineering Theses & Dissertations

The desire to optimize plant performance continues to direct the goals of design and plant engineers associated with larger thermal systems. With the increasing availability of software designed for modeling thermal systems, the task of improving plant performance continues to develop. The ability to model a facility using a commercially available software package allows the design engineer and plant engineer to investigate the effects of variations in plant conditions or components on overall plant operations.

An analysis of the Kirk Lumber Company's co-generating facility was performed using the modeling program PROSIM written by the consulting engineering firm Endat Oy, of …

An Integrated Engineering-Computation Framework For Collaborative Engineering: An Application In Project Management, Hisham Mohamed El-Sayed Abdelsalam

Mechanical & Aerospace Engineering Theses & Dissertations

Today's engineering applications suffer from a severe integration problem. Engineering, the entire process, consists of a myriad of individual, often complex, tasks. Most computer tools support particular tasks in engineering, but the output of one tool is different from the others'. Thus, the users must re-enter the relevant information in the format required by another tool. Moreover, usually in the development process of a new product/process, several teams of engineers with different backgrounds/responsibilities are involved, for example mechanical engineers, cost estimators, manufacturing engineers, quality engineers, and project manager. Engineers need a tool(s) to share technical and managerial information and to …

Managerial Decisions: A Discursive Analysis, Teresa Ann Mcconville

Plymouth Business School Theses

Decision making activity is at the heart of organisations and, as an essential managerial function, it has been the subject of an immense body of literature. As the majority of research has been undertaken within the disciplines of economics and psychology, studies have tended to emphasise economic rationality as the basis for cognitive reasoning, decision processes and judgement and as the analytic paradigm. However, in the face of new problems, and in times of profound change, conventional forms of thought may be problematic in themselves. This project suggests and assesses a Foucaultian framework as an alternative approach to the study …

A Systematic Study Of The Correlations Between Meteorite Impacts And Soot Formation, Susanna L. Widicus '00

Honors Projects

A massive extinction of more than 50 percent of existing life forms on Earth occurred 65 million years (Ma) ago. This event is marked in the geological record by the Cretaceous-Tertiary (KT) boundary and corresponds to the Chicxulub meteorite impact in the Yucatan Peninsula. Since 1985, large quantities ofreduced elemental carbon in the form of characteristic spheroidal clusters of soot have been found in twelve KT boundary sites from across the globe. Because ofthe wide geographic distribution ofthese sites, the data was interpreted to indicate that deposition ofsoot was a global phenomenon. The source of this global soot layer is …