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Development Of A Web-Based Mass Transfer Processes Laboratory: System Development And Implementation, Yusong Li, Eugene J. Leboef, P. K. Basu, Louis Hampton Turnver Iv

Department of Civil and Environmental Engineering: Faculty Publications

A web-based environment is utilized as a means to introduce advanced mass transfer processes concepts in environmental engineering and science courses. System development and implementation is presented, including detailed descriptions of the techniques employed to link software written in high level computer languages such as C++ and FORTRAN to an internet-based, user-friendly graphical user interface for both program input and output.

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Building Services Engineering

No abstract provided.

Joint Buffer Management And Scheduling For Input Queued Switches, Dequan Liu

Dissertations

Input queued (IQ) switches are highly scalable and they have been the focus of many studies from academia and industry. Many scheduling algorithms have been proposed for IQ switches. However, they do not consider the buffer space requirement inside an IQ switch that may render the scheduling algorithms inefficient in practical applications.

In this dissertation, the Queue Length Proportional (QLP) algorithm is proposed for IQ switches. QLP considers both the buffer management and the scheduling mechanism to obtain the optimal allocation region for both bandwidth and buffer space according to real traffic load. In addition, this dissertation introduces the Queue …

Numerical And Experimental Investigation Of Dry Particle Coating, Ajit Mujumdar

Dissertations

Dry particle coating is an emerging field in the industries that deal with particulate products and powder processing. Compared to the widely reported experimental studies of the dry particle coating, the theoretical modeling of such processes is found to be less comprehensive. The work presented in this thesis is an attempt to fill this gap.

The first part of the dissertation aims at the numerical investigation of the hybridization system (Nara Machinery, Tokyo, Japan). The flow behavior of different materials processed in this device is analyzed using three-dimensional Discrete Element Method (DEM) as well as the computational fluid dynamics (CFD) …

Study Of Vapor/Gas Permeation Using Thin Immobilized Liquid Membrane, Gordana Obuskovic

Dissertations

To improve liquid membrane selectivity and stability for removal of vapor and gases from a gas stream, a thin immobilized liquid membrane (ILM) has been studied. Low vapor pressure liquid solvent/solutions were immobilized in part of the micropores of a hydrophilic, hydrophobic or ceramic hollow fiber substrate. To prepare such thin ILMs, three approaches were used: evaporation of the a volatile solvent; acrylic acid-grafted hollow fibers providing a thin hydrophilic layer; pressurization technique.

For removal of volatile organic compound (VOC), a thin ILM of silicone oil incorporated in the micropores of a hydrophobic hollow fiber with a silicone rubber coating …

Robust And Efficient Video/Image Transmission, Xi Min Zhang

Dissertations

The Internet has become a primary medium for information transmission. The unreliability of channel conditions, limited channel bandwidth and explosive growth of information transmission requests, however, hinder its further development. Hence, research on robust and efficient delivery of video/image content is demanding nowadays.

Three aspects of this task, error burst correction, efficient rate allocation and random error protection are investigated in this dissertation. A novel technique, called successive packing, is proposed for combating multi-dimensional (M-D) bursts of errors. A new concept of basis interleaving array is introduced. By combining different basis arrays, effective M-D interleaving can be realized. It has …

The Development Of A Biodegradable Scaffold For A Tissue Engineered Heart Valve, Thomas Adam Alheidt

Theses

In the current state of medical technology, there exists the need for a quality medical device to replace a failing heart valve. Presently, mechanical valves as well as donor tissue valves, either from humans or animals are used to replace failing heart valves. These valves although they can operate in the heart satisfactorily are not equal to the body replacing its own valve. Tissue Engineering in simple terms is the field of helping the body replace its own failing organ. In scientific terms, Tissue Engineering is a relatively young field, a majority of the major advancements have come in the …

Characterization And Corrosion Of Bcc-Tantalum Coating Deposited On Aluminum And Steel Substrate By Dc Magnetron Sputtering, Chirag Joshi

Theses

Tantalum is one of the most versatile highly refractory corrosion-resistant metals. Tantalum coating can be used as an effective corrosion barrier if it is continuous, free from defects and it adheres well to the substrate. A DC magnetron sputtering technique was used to deposit tantalum on aluminum and steel. X-ray diffraction measurements revealed that the tantalum films produced by sputtering had two crystallographic structures: a body centered cubic α-phase and a metastable tetragonal β-phase. Tough and ductile alpha phase tantalum is preferred over the hard and brittle beta phase tantalum, as a protective coating. Alpha phase coatings were successfully deposited …

Implementation Of A Two-Dimensional Discrete Element Method To Describe Granular Materials Composed Of Elliptical Cohesionless Particles, Juan Jose Martinez Alvez

Theses

This work is aimed at developing a discrete element simulation that models the contact between elliptical grains or particles in granular materials. The goal is to implement an algorithm to carry out collision detection between ellipses as well as ellipsoidal objects. The practical issue here is that the real shape of macroscopic grains can be approximated better using elliptical curves than using spherical curves. In addition, the simulation model will also be valid for spheres, since these objects are special cases of ellipsoids.

An accurate contact detection algorithm was investigated by means of two different formulations. The first formulation determines …

Numerical Study Of Pneumatic Conveying Of Powders, Muhammad Mushahid Rafique Quereshi

Theses

The dense phase mode may be advantageous over the dilute phase mode, for some pneumatic conveying problems, because it causes less erosion of the pipeline, less attrition of the material, requires less dust collection and is effective even for smaller pipe diameters. The objective of this study is to numerically determine the parameters that govern the formation slugs in dense phase conveying. The distributed Lagrange multiplier/fictitious domain method (Glowinski et al. 1998 and Singh et al. 2000) is used to perform direct simulations of the motion of solid and gas phases in pipes with rectangular cross-sections. In this approach the …

Electrohydrodynamical Manipulation Of Particles Based On Dielectrophoresis, Oleksii Vasylyschuk

Theses

The movement of matter in a non-uniform electric field, termed dielectrophoresis, is of interest to scientists of various branches: physics, chemistry, engineering, and life science. To chemists and physicists it is a science of many varied phenomena. To engineers it is a source of new and useful techniques for separating materials or improving materials’ behavior. To ecologists it provides a major means of minimizing pollution. To life scientists it offers new ways to study and manipulate cells and their subparticles, and to help unravel the nature of living systems.

The purpose of this thesis is to concentrate on some aspects …

Vlsi Design Of Stability Routing Protocol For Sensors In Wireless Mobile Ad-Hoc Networks, Vishnu M. Mandava

Theses

This thesis gives a detailed description of the Application specific integrated circuit (ASIC) design of Stability routing protocol for sensors in mobile ad-hoc networks. The Stability routing protocol is based on the signal strength and position components during data transmission while considering sensors in an ad-hoc network. A general ad-hoc network has unpredictable and variable mobility patterns therefore the signal strength criteria is adopted for routing. Signal strength criteria has been proved to be efficient for communication between the mobile nodes without any data loss. In this thesis an architecture for a processor implementing stability routing protocol for effective communication …

Computer Simulation Of Automotive Disc Brake Noise, Vadims Milovs

Theses

Disc brake noise continues to be a major concern throughout the automotive industry despite efforts to reduce its occurrence. Many articles are written on this subject, but there still is no agreement on what exactly causes disc brake noise and what part of the braking system is responsible for it.

The goal of current research was to build a simplified but inclusive mathematical model of a disc brake system and investigate it using Matlab software. The twodimensional model including damping, Stribeck effect and stick-slip friction was built.

The model is unique in a way that all the similar models have …

The Design And Performance Of Special Purpose Middleware: A Sensor Networks Case Study, Venkita Subramonian, Guoliang Xing, Christopher Gill, Ron Cytron

All Computer Science and Engineering Research

General purpose middleware has been shown to be effective in meeting diverse functional requirements for a wide range of distributed systems. Advanced middleware projects have also supported a single quality-of-service dimension such as real-time, fault tolerance, or small memory footprint. However, there is limited experience supporting multiple quality-of-service dimensions in mid-dleware to meet the needs of special purpose applications. Even though general purpose middleware can cover an entire spectrum of applications by supporting the union of all features required by each application, this approach breaks down for distributed real-time and embedded systems. In particular, features from one dimension such as …

Recapturing And Conveying The Excitement Of Engineering Through Practice, Innovation And Integration, Marshall M. Lih

Teaching Entrepreneurship to Engineering Students

No abstract provided.

Technological Innovation: An Option In The Ms In Technology Program, James R. Gray

Teaching Entrepreneurship to Engineering Students

The Technological Innovation (TI) option of the Masters of Science in Technology program emphasizes the research, development and technical management of the technological innovation process within the technology-based organization. It is structured to aid the industrial and engineering professional that is responsible for the design and development of technical processes and products. This option includes the technical management of innovation processes, research and development, information technologies, and process technologies. Participants in this option come from a wide range of technological disciplines and draw on an extensive array of theoretical and applied knowledge. This paper presents the development and implementation of …

Tools And Metrics For Evaluating Modular Product Concepts Based On Strategic Objectives, Matthew Bailey Strong

Theses and Dissertations

The design of modular products has recently become the focus of significant research in the area of design theory and methodology. This focus is the result of increased awareness of the potential power of modularity to achieve certain product objectives. However, there continues to be a gap between the results of academic research and industrial application. The refinement, consolidation, and extension of this academic research would help design teams who are charged with developing modular products to use these academic findings in real world, industrial applications. The research presented in this document focuses on developing design tools, based on past …

Ultrasonic Technique For Investigation Of The Effect Of Grid-Generated Turbulence On Sound Wave Propagation, Tatiana A. Andreeva, William W. Durgin

Office of the Provost Scholarship

This paper concerns an experimental study of the effects of the grid-generated turbulence on the propagation of acoustical waves in a wind tunnel. Turbulence effects are investigated using ultrasound time-of-flight method, employing counter-propagating ultrasonic pulses. Turbulence effects are an important source of error in the active probing of the atmosphere using sound sources. The emphasis is on the propagation time fluctuations and their interpretation using theoretical analysis of Kolmogorov.

Winter/Spring 2003, 90.9 Wmpg Fm

WMPG Program Guides

Newspaper format

Unusual Luminescence Lines In Gan, M. A. Reshchikov, D. Huang, F. Yun, P. Visconti, L. He, H. Morkoç, J. Jasinski, Z. Liliental-Weber, R. J. Molnar, S. S. Park, K. Y. Lee

Electrical and Computer Engineering Publications

A series of sharp intense peaks was observed in the low-temperature photoluminescence spectrum of unintentionally doped GaN in the photon energy range between 3.0 and 3.46 eV. We attributed the majority of these peaks to excitons bound to unidentified structural and surface defects. Most of the structural- and surface-related peaks (at 3.21, 3.32, 3.34, 3.35, 3.38, and 3.42 eV) were observed in Ga polar films. In N polar GaN, we often observed the 3.45 eV peak attributed to excitons bound to the inversion domain interfaces.

Mass Transfer Coefficients For Laminar Longitudinal Flow In Hollow-Fibre Contactors, Ashok S. Sangani, Sangkyun Koo

Biomedical and Chemical Engineering - All Scholarship

We consider the problem of predicting the rate of mass transfer to a fluid flowing parallel to the axes of randomly placed aligned tubes, a model of hollow-fibre contactors. The analysis is carried out for the limiting cases of short contactors, for which the concentration boundary layers remain thin compared with the radius of the tubes, and for the fully developed case corresponding to very long tubes. Numerical simulations for random arrays are carried out for N randomly placed tubes within a unit cell of a periodic array. It is shown that the mass transfer coefficient for the fully developed …

Design, Fabrication, And Characterization Of An Alternating Phase Shifting Mask For Duv Lithography, Andrew C. Estroff

Journal of the Microelectronic Engineering Conference

The goal of this project is to design, fabricate, and characterize alternating phase shift masks for 248nm DUV lithography. The characterization of the masks was to include etch depth and sidewall angle measurements via atomic force microscopy (AFM). Etch times were to be varied in order to induce phase changes of 900, 1800, and 270°; one binary chrome on glass mask was also supposed to be fabricated to show the enhancements offered in processing by the phase shifting masks. The measurements of the etch profiles should not only be useful in determining the achieved phase shift and their correlation to …

Process Metrology For Ultrathin Gate Dielectrics, Julien Buisson

Journal of the Microelectronic Engineering Conference

One of the major challenges is to be able to grow and accurately measure such thicknesses of gate oxides. In addition, the gate oxide thickness may change during the polysilicon deposition, which is important to measure from the device point of view. The use of variable angle spectroscopic ellipsometer (VASE) has been shown to provide a technique for directly measuring the thickness of the oxide underneath polysilicon. The objective of this study Is to use VASE (energy range from 0.78 eV to 6 eV, which corresponds to wavelengths from 200 to 1600 nm) to measure ultra thin silicon dioxide layers …

Santa Clara Magazine, Volume 45 Number 3, Winter 2003, Santa Clara University

Santa Clara Magazine

10 - ACADEMIC EXCELLENCE AT SCU By Paul Locatelli, S.J. ln an adaptation of his convocation address, SCU 's president describes the University's goal to educate "the whole person."

12 - 'BECKHAM' BOOSTS SCU SOCCER By Victoria Hendel De La O. References to SCU in the hit movie have brought international attention to the women's soccer program.

14 - SEEKING SOLUTIONS Experts vi sit campus to discuss the issue of clergy abuse and work on a book about the topic.

18 - UNEARTHING THE PAST By Connie Skipitares. SCU archaeologists, anthropologists, and students probe a site near campus to learn …

Almeria-Mars: A Web Based Robotic Simulation, John Travis Ian Wood

Theses Digitization Project

This project discusses the concepton of a web-based simulation. In particular, it will deal with the development of a robotic Mars Pathfinder simulation delivered via the World Wide Web.

Military Leadership: A Context Specific Review, Leonard Wong, Paul Bliese, Dennis Mcgurk

United States Army: Publications

The purpose of this article is to review the literature on military leadership and highlight research opportunities for leadership scholars. The review uses a context specific approach and turns to a simplified version of Hunt’s (Hunt, J. G. (1991). Leadership: A new synthesis. Newbury Park, California: Sage) extended multilevel leadership model as a template to examine the many facets of military leadership. The military leadership literature is stratified into the systems, organizational, and direct levels of leadership with an examination of studies on the critical tasks and individual capabilities required at each level. Additionally, studies on organizational culture and effectiveness …

The Prevalence And Severity Of Coronary Artery Calcification On Coronary Artery Computed Tomography In Black And White Subjects, Timothy C. Lee, Patrick G. O’Malley, Irwin Feuerstein, Allen J. Taylor

United States Army: Publications

OBJECTIVES We studied the relationship between coronary artery calcium (CAC) and race in asymptomatic, active-duty personnel in the Prospective Army Coronary Calcium (PACC) project.
BACKGROUND Valid cardiovascular risk assessments in black Americans using coronary artery computed tomography (coronary CT) require the generalizability of population-based CAC score distributions derived from primarily white patient populations.
METHODS Among 1,000 consecutive participants (mean age, 42 ± 2 years; range, 40 to 45 years), 999 participants underwent coronary CT and indicated a specific racial affiliation. This included white, non-Hispanic in 699 (69.9%) participants and black, non-Hispanic in 194 (19.4%) participants. Univariate associations between race and …

Rodent Sperm Analysis In Field-Based Ecological Risk Assessment: Pilot Study At Ravenna Army Ammunition Plant, Ravenna, Ohio, Lawrence V. Tannenbaum, Matthew Bazar, Melanie S. Hawkins, Barney W. Cornaby, Elizabeth A. Ferguson, L. Chantelle Carroll, Patrick F. Ryan

United States Army: Publications

Ecological risk assessment (ERA) guidance recommends that field-truthing efforts proceed when modeled hazard quotients (HQs) suggest that toxicological effects are occurring to site receptors. To date, no field methods have been proposed by the regulatory community that can lead to definitive determinations of acceptable or unacceptable risk for birds and mammals, the two terrestrial classes of receptors that are commonly assessed using the HQ method. This paper describes rodent sperm analysis (RSA) as a viable method to be applied in the field at sites with historical contamination. RSA is capable of detecting biological differences that bear on reproduction, a highly …

Retrieval Of Subpixel Snow-Covered Area And Grain Size From Imaging Spectrometer Data, Thomas H. Painter, Jeff Dozier, Dar A. Roberts, Robert E. Davis, Robert O. Green

United States Army: Publications

We describe and validate an automated model that retrieves subpixel snow-covered area and effective grain size from Airborne Visible/ Infrared Imaging Spectrometer (AVIRIS) data. The model analyzes multiple endmember spectral mixtures with a spectral library of snow, vegetation, rock, and soil. We derive snow spectral endmembers of varying grain size from a radiative transfer model; spectra for vegetation, rock, and soil were collected in the field and laboratory. For three AVIRIS images of Mammoth Mountain, California that span common snow conditions for winter through spring, we validate the estimates of snow-covered area with fine-resolution aerial photographs and validate the estimates …

Transformation Of 2-Line Ferrihydrite To 6-Line Ferrihydrite Under Oxic And Anoxic Conditions, Ravi K. Kukkadapu, John M. Zachara, James K. Fredrickson, Steven C. Smith, Alice C. Dohnalkova, Colleen K. Russel

United States Department of Energy: Publications

Mineralogical transformations of 2-line ferrihydrite were studied under oxic and Fe³⁺-reducing conditions to establish the role, if any, of 6-line ferrihydrite (“well” organized ferrihydrite) in the reaction pathway and as a final product. In oxic experiments, concentrated suspensions (0.42 mol/L Fe³⁺ in 0.1 mol/L NaClO₄) of freshly synthesized 2-line ferrihydrite, with and without 3% Ni2+, were aged at an initial pH = 7.2 (unbuffered and unadjusted) and 25°C for more than three years. X-ray diffraction, transmission electron microscopy, and Mössbauer spectroscopy measurements were performed on the solids after different aging periods. The primary mineralogical products …