Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Graduate Theses, Dissertations, and Problem Reports (ETD)

Discipline
Keyword
Publication Year
File Type

Articles 4021 - 4050 of 5166

Full-Text Articles in Entire DC Network

Hybrid Neural Networks Models For A Membrane Reactor, Mohammed Al-Yemni Dec 2003

Hybrid Neural Networks Models For A Membrane Reactor, Mohammed Al-Yemni

Graduate Theses, Dissertations, and Problem Reports (ETD)

Artificial neural networks (ANN) have become an established discipline and have gained extensive interest within chemical engineering. In recent years, research effort has focused on the use of "hybrid artificial neural networks" (HANN) models that combine both the deterministic and the ANN elements. Several methods have been proposed for combining ANN with first principle relations. In this thesis, a new hybrid scheme, which is similar to that developed by Kasprow for a space-independent and time-dependent fed-batch microbial reactor, was developed for a space-dependent steady-state enzymatic reactor. This scheme combines ANN with mass balances and assumed rate expressions. It was shown …

Go to article

Numerical Analysis Of Source-Water Dynamics For Stream-Bounded Alluvial Aquifers, Sarah E. Webb Dec 2003

Numerical Analysis Of Source-Water Dynamics For Stream-Bounded Alluvial Aquifers, Sarah E. Webb

Graduate Theses, Dissertations, and Problem Reports (ETD)

Alluvial aquifers bounded by streams are water supply sources for numerous communities in the Ohio Valley, West Virginia. Groundwater flow models are tools for estimation of source areas, however, existing analytical solutions apply only in settings involving a single stream boundary. A series of numerical experiments was devised for wells near multiple surface sources examining the controlling aspects of well-location and boundary condition interaction on source areas. Local-scale models were constructed representing an alluvial aquifer bounded by a tributary intersecting a large river. Aquifer behavior was examined in response to variations in pumping well location and tributary gradient. Flow within …

Go to article

Model Predictive Control Design For Load Frequency Control Problem, Nedzad Atic Dec 2003

Model Predictive Control Design For Load Frequency Control Problem, Nedzad Atic

Graduate Theses, Dissertations, and Problem Reports (ETD)

Load Frequency Control (LFC) is a mechanism by which power generation and power demand are balanced.;Model Predictive Control (MPC) has been widely accepted as a viable control strategy in the process industry. It is a model based control strategy where an optimization procedure is performed in every sampling interval over a prediction horizon, yielding an optimal control action. The optimization criterion, or objective function, is chosen in such a way as to satisfy the controlled system dynamics and constraints, penalize system output deviation from the desired trajectory, and minimize control efforts. Furthermore, a possibility to incorporate economic objectives into the …

Go to article

Brook Trout (Salvelinus Fontinalis) Movement And Habitat Use In A Headwater Stream Of The Central Appalachian Mountains Of West Virginia, Marisa Nel Logan Dec 2003

Brook Trout (Salvelinus Fontinalis) Movement And Habitat Use In A Headwater Stream Of The Central Appalachian Mountains Of West Virginia, Marisa Nel Logan

Graduate Theses, Dissertations, and Problem Reports (ETD)

Brook trout (Salvelinus fontinalis) are the only salmonid native to the Appalachians. They are a resilient species, populating small, low productive streams. Although such streams have historically been abundant in the Appalachians, brook trout populations have been threatened due to habitat degradation such as logging and acidification of waters. The objective of this study was to evaluate brook trout habitat use, home range, and movement patterns in an Appalachian headwater stream during spring and more specifically high flow events. I implanted brook trout with radio tags and tracked their movement for approximately 30 days during late spring 2002 and early …

Go to article

Soil Characterization, Classification, And Biomass Accumulation In The Otter Creek Wilderness, Jamie Schnably Dec 2003

Soil Characterization, Classification, And Biomass Accumulation In The Otter Creek Wilderness, Jamie Schnably

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study evaluated soils of the Otter Creek Wilderness in the Monongahela National Forest. Thirteen sites were sampled and analyzed according to landscape position: three terrace soils (T), four ridgetop soils (R), three sideslope soils with argillic horizons (SSA), and three sideslope soils with cambic horizons (SSC). At each site, one pedon was described and sampled, and biomass data were collected. Standard chemical and physical properties, clay mineralogy, extractable sulfate and sulfated adsorption capacity were analyzed. The SSA soils had the highest pH, the most diverse vegetation, and the highest base saturation. These soils had a low risk for acid …

Go to article

Cerulean Warbler Relative Abundance And Frequency Of Occurrence Relative To Large-Scale Edge, Scott B. Bosworth Dec 2003

Cerulean Warbler Relative Abundance And Frequency Of Occurrence Relative To Large-Scale Edge, Scott B. Bosworth

Graduate Theses, Dissertations, and Problem Reports (ETD)

Cerulean Warblers (Dendroica cerulea) were studied in southwestern West Virginia where the coal mining technique of mountaintop mining/valley fill (MTMVF) continues to perforate large contiguous tracts of deciduous forest. My study objectives were to (1) quantify abundance and probability of occurrence of Cerulean Warblers relative to distance from large-scale edge (defined as reclaimed MTMVF sites) and (2) relate habitat structure and landscape characteristics to the species' probability of occurrence. Cerulean Warbler abundance increased significantly (P < 0.10) with distance from reclaimed mine edge. However, percent occurrence relative to distance from mine edge was not significant, suggesting a degree of tolerance to the large-scale edge created by MTMVF. Abundance was significantly greater on ridges than bottomlands. Percent occurrence did not differ among the three slope positions but followed a trend similar to abundance. Consequently, disturbances such as MTMVF in which ridges are removed may have a greater impact on populations compared to other sources of fragmentation where ridges are not disturbed. Other habitat structure analyses suggest good indicators of Cerulean Warbler presence are the more productive sites on northwest to east facing slopes and low sapling density. Similarly, Cerulean Warbler abundance was positively associated with more productive sites and snag density. Important landscape characteristics positively associated with abundance were large blocks of mature deciduous forest and low edge density. Mountaintop mining/valley fill alters the spatial configuration of forested habitats in southwestern West Virginia, thus creating less suitable habitat and edge effects that negatively affect Cerulean Warbler abundance, occurrence, and distribution in the reclaimed mine landscape.

Go to article

Population Level Dynamics Of Grasshopper Sparrow Populations Breeding On Reclaimed Mountaintop Mines In West Virginia, Frank K. Ammer Dec 2003

Population Level Dynamics Of Grasshopper Sparrow Populations Breeding On Reclaimed Mountaintop Mines In West Virginia, Frank K. Ammer

Graduate Theses, Dissertations, and Problem Reports (ETD)

During 2001 and 2002, I surveyed three mountaintop mining/valley fill (MTMVF) complexes in southern West Virginia to determine vegetation characteristics important to nest site selection and to estimate nest success for Grasshopper Sparrow populations inhabiting these complexes. I also performed genetic analyses to assess overall population structure, mating system, parentage, kinship, and gender of individuals comprising these populations. A total of 415 grasshopper sparrows were captured and systematic searches of study plots produced 75 active nests. Nest survival for 2001--2002 breeding season (33%) is comparable to survival rates previously reported in the literature. Nest survival rates decreased with increased reclamation …

Go to article

Temporal Control And Response Strength In A Free -Operant Psychophysical Procedure, Lori M. Lieving Dec 2003

Temporal Control And Response Strength In A Free -Operant Psychophysical Procedure, Lori M. Lieving

Graduate Theses, Dissertations, and Problem Reports (ETD)

The purpose of the present experiments was to examine the relation between timing and response strength. Pigeons responded on a two-component multiple schedule consisting of the free-operant psychophysical procedure, in which trials lasted 50 s. During the first 25 s of each trial, responding on the left key was reinforced according to a variable interval (VI) schedule of reinforcement. During the second 25 s of each trial, responding on the right key was reinforced according to a VI schedule of reinforcement. In Experiment 1, responding in one component was maintained by a VI 30-s schedule (rich component) and responding in …

Go to article

Designing A Scalable Dynamic Load -Balancing Algorithm For Pipelined Single Program Multiple Data Applications On A Non-Dedicated Heterogeneous Network Of Workstations, Ashraf Osman Dec 2003

Designing A Scalable Dynamic Load -Balancing Algorithm For Pipelined Single Program Multiple Data Applications On A Non-Dedicated Heterogeneous Network Of Workstations, Ashraf Osman

Graduate Theses, Dissertations, and Problem Reports (ETD)

Dynamic load balancing strategies have been shown to be the most critical part of an efficient implementation of various applications on large distributed computing systems. The need for dynamic load balancing strategies increases when the underlying hardware is a non-dedicated heterogeneous network of workstations (HNOW). This research focuses on the single program multiple data (SPMD) programming model as it has been extensively used in parallel programming for its simplicity and scalability in terms of computational power and memory size.;This dissertation formally defines and addresses the problem of designing a scalable dynamic load-balancing algorithm for pipelined SPMD applications on non-dedicated HNOW. …

Go to article

Investigation Of Initiation Of Reverse Transcription In Retroviruses Using Vectors With Two Primer -Binding Sites, Yegor A. Voronin Dec 2003

Investigation Of Initiation Of Reverse Transcription In Retroviruses Using Vectors With Two Primer -Binding Sites, Yegor A. Voronin

Graduate Theses, Dissertations, and Problem Reports (ETD)

Initiation of reverse transcription in retroviruses occurs on a specific place in viral genome, called primer-binding site (PBS). Cellular tRNA is annealed to the complementary PBS and is used as a primer. We constructed murine leukemia virus (MLV)-based vectors containing two PBSs, one in normal position and another in the middle of the vector. Green fluorescence protein (GFP) gene was inserted between the two PBSs. The internal PBS was derived from a spleen necrosis virus (SNV), which uses the same tRNA-Pro as a primer. We have shown that the internal PBS was functional for initiation of reverse transcription. Replication of …

Go to article

Gender Stereotypes In Children's Television Commercials And The Effects On Consumer Purchasing Behavior, Joanne G. Asztalos Dec 2003

Gender Stereotypes In Children's Television Commercials And The Effects On Consumer Purchasing Behavior, Joanne G. Asztalos

Graduate Theses, Dissertations, and Problem Reports (ETD)

This research presents an exploratory investigation on the extent of gender stereotypes portrayed in children's television commercials and the effects on consumer purchasing behavior. The author conducted two studies including a content analysis of viewing 75 children's television commercials, 25 boy, 25 girl, 25 neutral, and documenting evidence of roles, traits, activities, products, speaking parts and settings. Qualitative focus groups were then conducted to correlate the documented gender stereotypes with purchasing behaviors among children between the ages of 6--12. Major findings for this research revealed that there are many gender stereotypes in children's television commercials including the issue that male …

Go to article

Real-Time Measurement Of Oxides Of Nitrogen From Heavy-Duty Diesel Engines, Aparna Aravelli Dec 2003

Real-Time Measurement Of Oxides Of Nitrogen From Heavy-Duty Diesel Engines, Aparna Aravelli

Graduate Theses, Dissertations, and Problem Reports (ETD)

New emissions regulations and performance requirements imposed on modern diesel engines encourage the development of improved tools for emissions measurements. This study investigated one of the improved tools for NOx emissions measurement. Objectives of this thesis included measurement, comparison and prediction of NOx emissions from heavy-duty diesel engines using two different NOx analyzers. Steady state and transient tests were conducted on six heavy-duty diesel engines in the WVU Engine and Emissions Research Center (EERC). NOx emissions were measured using a conventional Rosemount NOx analyzer and a Cambustion fast response NOx analyzer. The Rosemount analyzer sampled dilute emissions whereas the fast …

Go to article

Generalized Nowhere Zero Flow, Jingjing Chen Dec 2003

Generalized Nowhere Zero Flow, Jingjing Chen

Graduate Theses, Dissertations, and Problem Reports (ETD)

Let G be an undirected graph, A be an (additive) abelian group and A* = A - {lcub}0{rcub}. A graph G is A-connected if G has an orientation D(G) such that for every function b : V(G ) A satisfying Sv∈VG b(v) = 0, there is a function f : E(G) A* such that at each vertex v ∈ V(G), ∂f(v), the net flow out from v, equals b( v). An A-nowhere-zero-flow (abbreviated as A-NZF) in G is a function f : E(G) A* such that at each vertex v ∈ V(G), ∂f(v) = 0.;In this paper, we investigate the …

Go to article

Crack Detection Technique For Reinforced Concrete Bridge Decks, Indumathi Chera Dec 2003

Crack Detection Technique For Reinforced Concrete Bridge Decks, Indumathi Chera

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study describes the instrumentation and test results of a reinforced concrete bridge deck constructed on 3-span continuous steel girders. The instrumented bridge is located in Evansville, West Virginia at the intersection of US Route 50 East and WV 92 South. An instrumentation system is developed and implemented specifically to measure and monitor the growth of cracks along the wheel path. The system consists of 30 crack-meters embedded in concrete over the bottom layer of the reinforcement. The crack-meter readings are automatically collected every 20 minutes together with the readings from other sensors that were placed in concrete and on …

Go to article

Simplified Live-Load Moment Distribution Factors For Simple Span Slab On I-Girder Bridges, Wesley D. Hevener Dec 2003

Simplified Live-Load Moment Distribution Factors For Simple Span Slab On I-Girder Bridges, Wesley D. Hevener

Graduate Theses, Dissertations, and Problem Reports (ETD)

The primary goal of this effort is to identify and assess various methods of computing live load distribution factors and to use the results of laboratory and field tests to compare these methods. It is further a goal of this work to use these methods to perform a parametric study over a wide range of typical slab on steel I-girder bridges to assess the accuracy of both the AASHTO Standard and AASHTO LRFD specifications and to propose an empirical model that correlates better with the analytical results within the range of parameters that are to be studied.;These studies include: (1) …

Go to article

Laboratory Experiments In Thermal Sciences, Christopher K. Jackson Dec 2003

Laboratory Experiments In Thermal Sciences, Christopher K. Jackson

Graduate Theses, Dissertations, and Problem Reports (ETD)

Study of the basic sciences (chemistry, biology, physics, etc.) requires experimental verification to support the theory developed in the classroom. Engineering solutions are the same in their need for verification. In an academic environment this verification comes in the form of laboratory courses. The link to applications is equally important as the demonstration of theory. This is especially true for engineering disciplines due to the nature of tasks engineers are expected to successfully complete in industry. It is vital for the engineer's career that he/she can successfully apply the background theory learned in university study to real world applications.;The Department …

Go to article

Characterization Of New Particulate Mmc Materials And Bolted Joints Through Applicable Astm Standards, Vinu Zacharia Mathew Dec 2003

Characterization Of New Particulate Mmc Materials And Bolted Joints Through Applicable Astm Standards, Vinu Zacharia Mathew

Graduate Theses, Dissertations, and Problem Reports (ETD)

Particulate reinforced metal matrix composites (PRMMC) comprise a new class of materials whose properties can be adjusted to suit a particular application. The main purpose of producing PRMMC is to achieve lightweight materials with added properties like high stiffness, high ultimate strength and hardness.;In this study we deal with PRMMC manufactured by a novel technology involving the pressure less infiltration of aluminum into a mass of ceramic reinforcement particles. Basic tests like tension test, three point bending test, hardness tests and coefficient of thermal expansion are conducted according to the ASTM standards in order to characterize the material. All these …

Go to article

Long-Term Performance Of Pot Hardware In Continuous Galvanizing Lines, Venkatesh Parthasarathy Dec 2003

Long-Term Performance Of Pot Hardware In Continuous Galvanizing Lines, Venkatesh Parthasarathy

Graduate Theses, Dissertations, and Problem Reports (ETD)

Preliminary comparative wearing tests were conducted on wearguard bearing system against CF3M (casting version of 316L steel), with tungsten carbide laser clad coating, at 30% and 50% production line tension. Tests were also conducted on Stellite 6 against Tribaloy T 400 at 50% production line tension. For each test, periodic measurements of wearing rate, surface microstructure and surface hardness were carried out. An unique dross build-up setup which consists of two sleeves counter rotating against each other was designed to simulate the dross build-up in production line. The chemical composition of the dross material formed and change in sleeve microstructures …

Go to article

Finite Element Damage Modeling Of Plain Weave Fabrics, Kaarthik K. Sikkil Dec 2003

Finite Element Damage Modeling Of Plain Weave Fabrics, Kaarthik K. Sikkil

Graduate Theses, Dissertations, and Problem Reports (ETD)

Plain weave fabrics are used as reinforcements in composites in order to obtain improved inter-laminar properties. But these advantages are at the cost of reduced stiffness and strength in the in-plane directions. Therefore, it is important to study the mechanical behavior of such composites. In this work, the geometrical model needed for finite element discretization of the plain weave fabrics are developed for three configurations---single lamina, iso-phase, and out-of-phase. Next, a procedure to determine the longitudinal elastic modulus under tensile loading is presented. Then, a meso level damage model is used for predicting the inelastic tensile behavior of the fabrics. …

Go to article

One-Dimensional Transient Numerical Modeling Of A Micro-Power Generation System, Emre Tatli Dec 2003

One-Dimensional Transient Numerical Modeling Of A Micro-Power Generation System, Emre Tatli

Graduate Theses, Dissertations, and Problem Reports (ETD)

Two core modules of a more comprehensive model for analyzing the flow of fluids in a hybrid system including a fuel cell are developed. First part consists of a new procedure for scaling turbomachinery maps. In the last few decades, the sizes of turbomachinery have been getting smaller and smaller for various purposes. New designs have pushed the limits of power generation to be in more compact sizes, which lead to smaller compressors and turbines. For new designs, it is important to know how the turbomachinery in the system will behave at certain conditions. But it is not practical to …

Go to article

Architecture-Level Risk Assessment Tool Based On Uml Specification, Tianjian Wang Dec 2003

Architecture-Level Risk Assessment Tool Based On Uml Specification, Tianjian Wang

Graduate Theses, Dissertations, and Problem Reports (ETD)

Most faults in software systems are likely to be found in only a few of components [1]. The early identification of these components allows the project management to focus on remedial actions, such as redesigning the critical components that are likely to cause field failures or optimally allocating resources on implementation and testing [2]. This thesis presents a prototype tool called Architecture-level Risk Assessment Tool (ARAT) to demonstrate the process of risk assessment. The final result of this process is to distinguish those potentially high risk components in the software system. ARAT is built on the risk assessment methodology [3]. …

Go to article

Plant-Wide Energy Assessment Using A Systems Approach, Rajkumar Selvaraj Dec 2003

Plant-Wide Energy Assessment Using A Systems Approach, Rajkumar Selvaraj

Graduate Theses, Dissertations, and Problem Reports (ETD)

Energy plays a central role in the operation of the industrialized U.S. economy. Industry is historically the largest consuming sector of the economy with more than 60 percent of the energy consumed for manufacturing. The U.S. chemical industry is the world's largest producer of chemicals producing over 25 percent of the total production worldwide. In a chemical industry, the energy is used to supply heat and power for manufacturing processes and for energy feedstock. Due to the energy intensive nature of chemical industries, energy assessments performed could yield huge savings in energy and cost.;The aim of this research is to …

Go to article

Spline Based Controller For Nonlinear Systems, Ali Karimi Dec 2003

Spline Based Controller For Nonlinear Systems, Ali Karimi

Graduate Theses, Dissertations, and Problem Reports (ETD)

The objective of this thesis is to apply spline theory to implement controllers for nonlinear systems. Two different systems, forced Duffing oscillators and power systems, are investigated. The spline method is used to mimic the controller which drives a state of the Duffing system toward a desired path. The spline-based nonlinear controller has piecewise polynomial segments with different order of polynomials on each segment. Controller efforts for different order of polynomial interpolants and power spectral densities of the controller signals are compared with the exact feedback linearizaton method.;The first objective for power systems is to design nonlinear excitation controllers for …

Go to article

Analysis Of A Curved Buoyant Jet In An Enclosure Using Les, Allen E. Badeau Jr. Dec 2003

Analysis Of A Curved Buoyant Jet In An Enclosure Using Les, Allen E. Badeau Jr.

Graduate Theses, Dissertations, and Problem Reports (ETD)

The objective of this study is to investigate curved buoyant jets in an enclosure using Large Eddy Simulation (LES) methods with an Implicit Turbulent Model (ITM). To accomplish this goal, a numerical solver was written, named DREAMRTM, which is capable of solving three dimensional, transient flows using an accurate monotonic and non-oscillatory upwinding scheme. The three-dimensional Navier-Stokes equations are solved in Cartesian coordinates, with the control volume approach being implemented on a staggered grid. The numerical scheme uses a fractional time step method, with the overall spatial and temporal accuracy being second order.;In ITM simulations, there is no explicit subgrid-scale …

Go to article

Reaction Engineering Study Of Natural Gas Hydrate Formation In Special Packed -Bed Reactors By Controlling The Boundary Layer Surfaces Of The Gas -Liquid -Solid Phases, Budhijanto Budhijanto Dec 2003

Reaction Engineering Study Of Natural Gas Hydrate Formation In Special Packed -Bed Reactors By Controlling The Boundary Layer Surfaces Of The Gas -Liquid -Solid Phases, Budhijanto Budhijanto

Graduate Theses, Dissertations, and Problem Reports (ETD)

Natural gas hydrates (NGH) are crystalline compounds that consist of water and natural gas (NG) molecules. By hydrogen bonds, water molecules form a regular lattice structure containing many cavities. NG molecules occupy the cavities, and therefore stabilize the cavities. NGH are considered to be one of the most potential alternative world energy resources. The applications of NGH in other fields, such as NG purification, storage, and transportation, are also possible. To obtain the full benefits of all the possible applications of NGH, a full understanding of the kinetics of NGH formation is needed.;Strictly speaking, the experimental works of reproducible intrinsic …

Go to article

Evaluation Of Regulated Emissions From Heavy-Duty Diesel Vehicles In The South Coast Air Basin, Thomas M. Buffamonte Aug 2003

Evaluation Of Regulated Emissions From Heavy-Duty Diesel Vehicles In The South Coast Air Basin, Thomas M. Buffamonte

Graduate Theses, Dissertations, and Problem Reports (ETD)

It is important to know how heavy-duty diesel vehicles affect the air quality in the United States. Twenty-five heavy-duty diesel vehicles in the CRC E55/59 Phase I study were tested on the Urban Dynamometer Driving Schedule (UDDS), AC50/80 and the Heavy Heavy-Duty Diesel Truck (HHDDT) Schedule using the West Virginia University Transportable Emissions Laboratory (TransLab). Every vehicle in the CRC E55/59 Phase I study was tested at 30,000 lbs. (Unladen) and 56,000 lbs. (Laden) on the HHDDT, except for one tanker truck that was tested at 45,000 lbs (Laden). Also, the first thirteen vehicles in the study were tested on …

Go to article

Hydrology Of The Beaver Creek Watershed Using The Tr-20 Model And The Hec-Hms Program, Vijayalakshmi Tummala Aug 2003

Hydrology Of The Beaver Creek Watershed Using The Tr-20 Model And The Hec-Hms Program, Vijayalakshmi Tummala

Graduate Theses, Dissertations, and Problem Reports (ETD)

The proposed alignment of the Appalachian Corridor H section from Davis to Bismarck passes through Beaver Creek watershed, Tucker County, West Virginia, which was heavily affected by the historical mining, deteriorating the water quality conditions of the Beaver Creek. To improve the water quality of Beaver Creek, identification of the sources of impaired waters and the conveyance of these flows into passive treatment facilities for remediation has been proposed. To aid in the design of these treatment facilities, a baseline hydrology description through the hydrologic modeling of the watershed with the aid of rainfall-runoff models was proposed. The watershed modeling …

Go to article

Acoustic Emission Evaluation Of Frp Composite Specimens In Tension And Bending, Ryan Edward Arnold Aug 2003

Acoustic Emission Evaluation Of Frp Composite Specimens In Tension And Bending, Ryan Edward Arnold

Graduate Theses, Dissertations, and Problem Reports (ETD)

Fiber Reinforced Polymer composites are relatively new to the bridge construction industry. One of the challenges to greater usage is the lack of a nondestructive method to accurately evaluate them. Nondestructive evaluation of FRP composite structures using Acoustic Emissions was conducted. Seven tension specimens and fifteen bending specimens from three different FRP manufacturers were tested. The hand-laid tension specimens produced at WVU were tested following ASTM D3039. The bending specimens were tested according to ASTM D790.;AE parameters were analyzed, and connections were found between them and the loading quarter of the specimens along with the damage zone of the specimens. …

Go to article

Assessment Of Students' Motivation To Use Computer Tools In A Web -Enhanced Counseling Course, Ying-Ying Kuo Aug 2003

Assessment Of Students' Motivation To Use Computer Tools In A Web -Enhanced Counseling Course, Ying-Ying Kuo

Graduate Theses, Dissertations, and Problem Reports (ETD)

Increasing numbers of professional counseling educators recognize the importance of information technology in counselor education, but the majority of members in the counseling community still lack interest in using computer tools for their professional development. How to motivate them to acquire these necessary skills is a problem in counselor education. This study provided a motivating web-based instructional (WBI) design for a web-enhanced course and examined counseling students' motivation to use computer tools in the course. It focused on four research questions that examined (1) how students' use of computers changed; (2) the impact of web-based instructional (WBI) features on their …

Go to article

Locomotive Emissions Effects Due To Engine Configuration, Nicholas P. Amandus Aug 2003

Locomotive Emissions Effects Due To Engine Configuration, Nicholas P. Amandus

Graduate Theses, Dissertations, and Problem Reports (ETD)

There are two studies reported in this document. The first study tested a General Electric C39-8 (Norfolk Southern Engine Number 8678) locomotive and a General Electric D8-40C (Norfolk Southern Engine Number 8692) locomotive, which were equipped with General Electric Model 7FDL16L6 diesel engines with mechanically controlled fuel injection. The objective of this study was to determine if a mechanically fuel injected diesel locomotive engine could be made to meet the EPA Tier 0 emissions limits without a substantial loss in fuel economy by retarding the injection timing and installing a more efficient turbocharger. The first locomotive was equipped with a …

Go to article

First Prev Next Last