Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Engineering (555)
- Physical Sciences and Mathematics (501)
- Social and Behavioral Sciences (459)
- Life Sciences (301)
- Medicine and Health Sciences (292)
-
- Arts and Humanities (196)
- Psychology (175)
- Education (152)
- Chemistry (128)
- Mechanical Engineering (112)
- Environmental Sciences (92)
- Earth Sciences (90)
- Chemical Engineering (85)
- Civil and Environmental Engineering (82)
- Computer Sciences (79)
- Electrical and Computer Engineering (74)
- Materials Science and Engineering (70)
- Physics (67)
- Public Health (62)
- Computer Engineering (55)
- Operations Research, Systems Engineering and Industrial Engineering (54)
- Communication (52)
- Music (52)
- Analytical Chemistry (51)
- Geology (51)
- Nursing (50)
- Rehabilitation and Therapy (50)
- Sociology (49)
- Aerospace Engineering (47)
- Civil Engineering (47)
- Keyword
-
- Mechanical engineering (318)
- Electrical engineering (210)
- Civil engineering (148)
- Clinical psychology (133)
- Computer science (123)
-
- Chemical engineering (122)
- Ecology (79)
- Forestry (77)
- Higher education (77)
- Petroleum engineering (76)
- Aerospace engineering (74)
- Materials science (74)
- Industrial engineering (72)
- Public health (71)
- Behavioral psychology (66)
- Environmental engineering (66)
- Mining engineering (65)
- Environmental science (64)
- Educational psychology (63)
- Developmental psychology (62)
- Educational technology (62)
- Aquatic sciences (60)
- Social psychology (59)
- Machine Learning (58)
- Geology (57)
- Energy (56)
- Animal sciences (52)
- Kinesiology (52)
- Physical education (50)
- Biomedical engineering (49)
- Publication Year
- File Type
Articles 7081 - 7110 of 7646
Full-Text Articles in Entire DC Network
The Effect Of Teacher Immediacy, Affinity -Seeking, And Misbehaviors On Instructional Outcomes., Katherine S. Thweatt
The Effect Of Teacher Immediacy, Affinity -Seeking, And Misbehaviors On Instructional Outcomes., Katherine S. Thweatt
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to investigate the mediating effect of teacher immediacy and affinity-seeking on misbehaviors and credibility and affective learning. Participants were undergraduate students enrolled in large-lecture courses at a large mid-Atlantic university. Teacher immediacy, affinity-seeking, and misbehaviors were manipulated in scenarios. Participants were exposed to one scenario and asked to complete credibility and affective learning measures in relation to the teacher in the scenario. The results of the study revealed that significant main effects were present for teacher immediacy, affinity-seeking, and misbehaviors. The significance level was set at .05. While significant interaction effects were present, the …
The Connection Between The Current Penetration-Based National Ambient Air Quality Standard And Dose Can Be Considered Questionable., Michael T. Berakis
The Connection Between The Current Penetration-Based National Ambient Air Quality Standard And Dose Can Be Considered Questionable., Michael T. Berakis
Graduate Theses, Dissertations, and Problem Reports (ETD)
This research examined the bias between penetration (as PM2.5) and deposition (as deposited submicrometer particulate DSP) due to the variability of ambient air particle size distributions. A size mobility particle analyzer and portable dust monitor were used to measure count and mass data at three locations in Morgantown West Virginia It was found that over 50% of the median diameters are less than 1µm. A correlation between deposition and penetration was found even though the PM 2.5 criterion is not a good indication of dose. This was due to a lack of variability in the measured distributions. Further research is …
Backcalculation Of Pavement Layers Moduli Using Three-Dimensional Nonlinear Explicit Finite Element Analysis., Gergis W. William
Backcalculation Of Pavement Layers Moduli Using Three-Dimensional Nonlinear Explicit Finite Element Analysis., Gergis W. William
Graduate Theses, Dissertations, and Problem Reports (ETD)
After reviewing the existing literature on FWD testing and backcalculation algorithms, a new backcalculation approach based on Three Dimensional Finite Element Modeling (3D FEM) was developed. This approach accounts for the transient dynamic nature of FWD load, the three dimensional geometry of the pavement structure, and the friction and bonding characteristics of pavement layers interfaces. The 3D FEM backcalculation approach was used to backcalculate the layers moduli of flexible, rigid, and composite pavement sites located in West Virginia. The layers moduli of each site were also evaluated using three widely used backcalculation algorithms: MODULUS, EVERCALC, and MODCOMP. Comparison of their …
The Familial Contexts Of Ego-Resiliency In Pre-Schoolers., Sherry J. Burchett
The Familial Contexts Of Ego-Resiliency In Pre-Schoolers., Sherry J. Burchett
Graduate Theses, Dissertations, and Problem Reports (ETD)
This study explored the familial contexts of ego-resiliency. Ego-resiliency is the extent that an individual can modify his impulse expression to meet the demands of changing situations. Sixty mothers of children aged 3 to 6 years along with the children’s teachers were used. Mothers completed the Family Environment Scale and the Hollingshead Index of Social Status. Teachers completed the “Common Language” Child Q-Set to measure ego-resiliency in the child. No sex differences existed in the mean r-value for ego-resiliency. Younger children had higher ego-resiliency levels on the Cohesion, Independence, Active-Recreational Orientation, Moral Religious Emphasis, and Control subscales. Families high in …
The Effect Of The Electrode Composition On Electron Transfer Through An Electroactive Monolayer., Kwansik Yoon
The Effect Of The Electrode Composition On Electron Transfer Through An Electroactive Monolayer., Kwansik Yoon
Graduate Theses, Dissertations, and Problem Reports (ETD)
This thesis describes the development of methods for determining the rate constants between a single type of an electroactive self-assembled monolayer on four metals: Au, Pt, Ag, and Hg. Marcus density-of-states theory predicts that the standard rate constant is proportional to the density of states (DOS) of the metal. The DOS increases by a factor of ten for the four metals above. Tafel plots are obtained from which the standard rate constant and the reorganization energy are extracted. Within experimental uncertainty, the standard rate constant is the same on Au, Pt, and Ag. Surprisingly, the reorganization energy is half as …
Does Culture Translate: Can We Make The Words Our Own?, Kathleen C. Gallivan
Does Culture Translate: Can We Make The Words Our Own?, Kathleen C. Gallivan
Graduate Theses, Dissertations, and Problem Reports (ETD)
A collaborative effort between the Departments of Theatre and Foreign Languages, the study, using ethnographic techniques, documents the process of developing cultural awareness of a young group of actors as they rehearsed a post Spanish Civil War play. Analysis of data collected over five weeks through interviews, a demographic questionnaire, and observations by both the thesis director and the researcher reveal that with motivation and a little guidance students will connect, and further, understand another culture. These findings are significant since the use of theatre in this fashion offers a means to motivate students and peak interest in target culture, …
Comparing Moral Values In Gotthold Ephraim Lessing's "Miss Sara Sampson" And Nathaniel Hawthorne's "The Scarlet Letter"., Karsten Dieter Kleine
Comparing Moral Values In Gotthold Ephraim Lessing's "Miss Sara Sampson" And Nathaniel Hawthorne's "The Scarlet Letter"., Karsten Dieter Kleine
Graduate Theses, Dissertations, and Problem Reports (ETD)
This thesis examines the impact of rigid moral codes on women by comparing two works, Lessing’s Miss Sara Sampson, (1775), and Hawthorne’s The Scarlet Letter, (1850). Although the works were written in different centuries and continents, they share a common theme: the clash between patriarchal control and women’s quest for self-determination. In each work, a beautiful young woman violates the social code by becoming involved in an illicit love affair, and because of this transgression and her refusal to renounce her love, is severely punished. Also in each work, the father-daughter relationship is highlighted and can be seen to symbolize …
The Effects Of Teaching In A Professional Development School And The National Council Of Teachers Of Mathematics Professional Standards., Laora Dauberman Brizendine
The Effects Of Teaching In A Professional Development School And The National Council Of Teachers Of Mathematics Professional Standards., Laora Dauberman Brizendine
Graduate Theses, Dissertations, and Problem Reports (ETD)
The National Council of Teachers of Mathematics' (NCTM) Professional Standards for Teaching Mathematics presents a vision of what necessary components should be included in teaching mathematics to support the reforms presented in the Curriculum and Evaluation Standards . The six Professional Standards offer insight, guidance, and vignettes explaining how a mathematics teacher at the K–12 levels can and should guide their students in the attainment of mathematical power. The Holmes Group, a consortium of Deans from Colleges of Education within large research universities in the United States, has as its primary goal to reform teacher education programs as well as …
A Qualitative Study Of Five West Virginia K-12 Ruralnet Project Teachers Merging The Internet Into Their Instruction And How The Internet Affects Professional Practice., David A. Falvo
Graduate Theses, Dissertations, and Problem Reports (ETD)
This qualitative study explores the day-to-day classroom work of five West Virginia K–12 RuralNet Project teachers, highlighting the drama of integrating technology into learning and showing how these teachers build and refine relationships to foster their sense of professionalism, through the use of technology. This study shows how teachers use the Internet as an instructional resource and as a tool for connecting to other people within and outside of the learning community. The participants of this study began to learn new technology skills during the summer of 1995. Today, they are integrating Internet technology into their daily teaching and planning …
Association Of Late Embryonic Mortality In Beef Cows With Concentrations Of Estradiol-17beta And Prostaglandin F(2)Alpha., Phillip J. Bridges
Association Of Late Embryonic Mortality In Beef Cows With Concentrations Of Estradiol-17beta And Prostaglandin F(2)Alpha., Phillip J. Bridges
Graduate Theses, Dissertations, and Problem Reports (ETD)
The relationship of luteal function and embryonic survival to concentrations of estradiol-17β or prostaglandin (PG) F2α was evaluated after induction of replacement corpora lutea (CL) in lutectomized beef cows maintained on flurogestone acetate (FGA). On day 26 of pregnancy the CL was enucleated, and the ovary contralateral to the gravid uterine horn was removed. Pregnancy was maintained initially by the administration of FGA (6 mg, s.c.) every 12 h, beginning 12 h before lutectomy. Between days 28 and 31, when a follicle had grown to 10 mm in diameter, cows were treated with hCG (1000 IU, i.m.) to induce formation …
The Physiological Effects Of A 12-Week Program Of Progressive Low-Impact Aerobic Dance On Adults With Mental Retardation., David John Cluphf
The Physiological Effects Of A 12-Week Program Of Progressive Low-Impact Aerobic Dance On Adults With Mental Retardation., David John Cluphf
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of the study was to evaluate the physiological effects of a 12 week program of low-impact aerobic dance on adults with mental retardation. Twenty-seven participants were involved in the study and were non-randomly divided into an experimental group (N = 15; 8 male, 7 female) that participated in the exercise program, and a control group (N = 12; 7 male, 5 female) which went about their normal daily activities. The exercise program consisted of a 12-week, progressive, low-impact program of aerobic dance. Each participant underwent a series of field tests to evaluate physical fitness. The tests included the …
The Effect Of Argon Laser Irradiation On Etched And Pumiced Human Enamel: An In Vitro Study., John Robert Schouten
The Effect Of Argon Laser Irradiation On Etched And Pumiced Human Enamel: An In Vitro Study., John Robert Schouten
Graduate Theses, Dissertations, and Problem Reports (ETD)
Decalcification around orthodontic appliances is an ongoing problem during orthodontic treatment. Argon laser irradiation has been shown to decrease the solubility of enamel. The objective of this study was to determine the effects of argon laser irradiation on the solubility of etched and pumiced enamel. Twelve human third molar teeth were sliced into six 1mm sections, one section from each tooth was randomly assigned to one of 6 groups: I. No treatment, II. Argon laser irradiation at 120 J/cm2, III. Pumiced enamel, IV Pumiced enamel and laser irradiation, V. Pumiced and etched enamel, VI. Pumiced and etched enamel plus laser …
Willingness To Pay For Industrial Recruitment: A Look At Local Decision-Maker Activity Versus Citizen Preference, Beth Ann Loy
Willingness To Pay For Industrial Recruitment: A Look At Local Decision-Maker Activity Versus Citizen Preference, Beth Ann Loy
Graduate Theses, Dissertations, and Problem Reports (ETD)
Academic research in the area of economic development policy is overwhelmingly critical of industrial recruitment, recommending instead that resources be directed towards strategies such as business retention and expansion, fostering local entrepreneurship, and amenity development. This research moves beyond criticizing industrial recruitment policy and explores one potential reason, a high discount rate, for practitioners' reliance on recruitment over other available local development techniques. The research also investigates developer's probability of success for industrial recruitment as well as alternative development strategies and examines whether economic developer use of incentive packages to recruit local businesses is a rational decision, i.e., supported by …
Real-Time Multimedia-Based Education Through The Internet, Abhay Arun Bakshi
Real-Time Multimedia-Based Education Through The Internet, Abhay Arun Bakshi
Graduate Theses, Dissertations, and Problem Reports (ETD)
The rapid advances in computer and communications technologies are challenging the American education systems to provide increased educational opportunities beyond the traditional geographic boundaries at a reasonable cost. Many educational institutions are answering this challenge by developing distance education programs. Distance education provides effective learning environment. An important requirement for effective distance education is the availability of continuous interactivity and immediate feedback. Over the Internet, synchronous sharing of multimedia content introduces unacceptable delays as network bandwidth is limited. In this thesis, the issue of Internet bandwidth is minimized and a novel system is developed for distance education using multimedia course …
Investigation Of A Paleocatena Across A Late Pennsylvanian Landscape Comprised Of Organic And Mineral Paleosols, Nick Fedorko Iii
Investigation Of A Paleocatena Across A Late Pennsylvanian Landscape Comprised Of Organic And Mineral Paleosols, Nick Fedorko Iii
Graduate Theses, Dissertations, and Problem Reports (ETD)
Exposures of the Pittsburgh coal bed, its seatearth, and correlative rocks at six sites along a 79 mile-long traverse from Morgantown, West Virginia south to near Burnsville, West Virginia comprise a paleocatena of organic and mineral paleosols formed on a coeval landscape. Northern sites were poorly drained leading to weakly developed Inceptisol profiles in the seatearth followed by thick accumulations of organic matter. More highly evolved profiles developed at the better drained sites to the south contain: highly leached, kaolinitic A horizons; slickensided horizons; subsurface accumulation of iron oxide; strong soil structure; in-situ clay production and translocation; and redoximorphic concentrations …
Desire For Thinness And Desire For Health In Eighteen And Nineteen-Year-Old Females, Monica Gene Andis
Desire For Thinness And Desire For Health In Eighteen And Nineteen-Year-Old Females, Monica Gene Andis
Graduate Theses, Dissertations, and Problem Reports (ETD)
Desire for thinness and desire for health were surveyed among eighteen and nineteen year old female adolescents in north-central West Virginia to determine the incidence of these motivations within this population and their relationship to unnecessary weight loss concerns, and dieting behaviors. Variables derived from body image satisfaction, self-esteem, socioeconomic status, religiosity, and food management behavior were examined for their ability to predict desire for thinness and health in subjects.;Using the statistical process of discriminate analysis, 51.6% of 345 subjects were correctly classified into groups desiring thinness and/or health. Only weight perception accuracy and food management group were found to …
Computational Modeling Of Brittle Impact Erosion Mechanisms, Shanmuga Sundaram Balasubramaniyam
Computational Modeling Of Brittle Impact Erosion Mechanisms, Shanmuga Sundaram Balasubramaniyam
Graduate Theses, Dissertations, and Problem Reports (ETD)
Materials are subjected to an erosion-corrosion environment in a wide range of applications today. Elevated temperatures promote the formation of oxide layers in jet engines. In fluidized bed boilers, the bed materials and piping of slurries and caustic materials cause erosion and corrosion. The process of erosion-corrosion may result in material loss and damage. Proper analytical modeling of the erosion-corrosion processes validated by experiments is needed to estimate the extent of damage in the material.;Empirical relations are available in the literature for predicting the amount of material loss due to erosion. These are obtained by conducting large number of experiments. …
Impedance Effects Of Metallic Ground Plane On The Ctha Antenna, Tao Guan
Impedance Effects Of Metallic Ground Plane On The Ctha Antenna, Tao Guan
Graduate Theses, Dissertations, and Problem Reports (ETD)
As with the fast-paced development of the communication industry, antennas have become an indispensable part of daily life. However, everyone may have experienced the malfunction of a communication system or radio due to a nearby human body or building or automobile. Then comes the question of how adjacent objects influence the antenna. This thesis has concentrated on the study of these effects on the impedance of the CTHA (contrawound toroidal helical antenna).;The results of this study indicate the CTHA's input impedance changes as a damped sinusoid function of the distance between it and the metallic ground plane. For equivalent distances …
Development Of A Heavy-Duty Vehicle Chassis Dynamometer Test Route, James Joseph Daley
Development Of A Heavy-Duty Vehicle Chassis Dynamometer Test Route, James Joseph Daley
Graduate Theses, Dissertations, and Problem Reports (ETD)
A heavy duty vehicle chassis dynamometer driving route, titled "City-Suburban Heavy Vehicle Route" (CSHVR) was developed. Data for designing the CSHVR were collected using a Campbell Scientific 21x. Procedures were developed to reduce statistically the speed and time data into representative speed vs. time cycles. Criteria for producing the speed vs. time cycles included average vehicle speed, standard deviation of vehicle speed and total cruise time. The speed vs. time cycle was converted into a speed vs. distance route with free acceleration ramps. Using this method, the CSHVR was developed. Testing of the CSHVR was completed using the West Virginia …
Determination And Analysis Of Natural Gas Vehicle Tailpipe Emissions Based On Continuous Cvs Measurement, Jingang Fu
Determination And Analysis Of Natural Gas Vehicle Tailpipe Emissions Based On Continuous Cvs Measurement, Jingang Fu
Graduate Theses, Dissertations, and Problem Reports (ETD)
Code of Federal Regulations Title 40 (CFR-40) specified a formula for calculating constant Dilution Factor (DF) to account for background pollutants in Constant Volume Sampler (CVS) emissions measurement system. However, it is recognized that the DF is dynamically changing due to the CVS mechanism. Based on the continuous measurement data obtained from natural gas vehicle emissions testing, a new approach was used in this study to calculate instantaneous DF of the CVS system during the test cycle. Using the instantaneous DF improves the accuracy of mass emission measurements, especially when the exhaust pollutant concentrations were approaching that in the ambient …
Determination Of Resistance Across Development Section Return Stoppings, James Robert Gandy
Determination Of Resistance Across Development Section Return Stoppings, James Robert Gandy
Graduate Theses, Dissertations, and Problem Reports (ETD)
This thesis describes a ventilation engineering study to determine the resistance across return stoppings on continuous miner development sections. By determining the resistance across return stoppings, one equivalent resistance branch can be created to model leakage across a return stopping line on a development section. This thesis evaluates four types of return stoppings to determine which construction techniques and materials provide the highest resistance, thus allowing minimal leakage from the intake to return entry.;The first phase of the thesis outlines the data gathering process including; station locations, equipment requirements and techniques. Second, the data is used to create a model …
Rheological Properties Of Candle Filter Deposits At Elevated Temperatures And Pressures, Brian Robert Jordan
Rheological Properties Of Candle Filter Deposits At Elevated Temperatures And Pressures, Brian Robert Jordan
Graduate Theses, Dissertations, and Problem Reports (ETD)
In order to improve the performance of hot gas ceramic candle filters, the theological properties of two types of filter deposits were studied. Black powder from the IGCC (Integrated Gasification Combined Cycle) provided consistent data when sampled from two different sources. This powder's mechanical properties were independent of elevated temperature conditions, suggesting that the particle adhesion process is controlled by the theological properties of the powder. Per US DOE request an apparatus was built to more accurately simulate candle filtration, and it was used to show that the process was unaffected by elevated inlet pressure conditions. The system was modeled …
Productive Performance And Fertility Of Broiler Breeders Maintained In Commercial Colony Cages And On The Conventional Floors, Kitogho J. Mwashighadi
Productive Performance And Fertility Of Broiler Breeders Maintained In Commercial Colony Cages And On The Conventional Floors, Kitogho J. Mwashighadi
Graduate Theses, Dissertations, and Problem Reports (ETD)
A trial with four replicates was conducted to compare performance and fertility of naturally mated broiler breeders maintained on litter floor versus their counterparts maintained in two tiered colony cages. Cage maintained hens with restricted feeding weighed less (P 0.05) was found in egg weights among treatments. No difference (P > 0.01) was found in feed conversion ratio per dozen eggs produced by hens maintained in cages and those on the conventional floors. A higher (P < 0.05) hen-day production was observed from 29 to 35 weeks of age in broilers maintained in cages than those on the conventional floors, but after this period no difference (P > 0.05) occurred. There were more (P < 0.05) eggs collected with cracks from cages than from the litter floors. The fertility rate was different (P 0.05) difference in mortality rate occurred between hens maintained on the fitter floors versus those in cages. When the breeders were 41 weeks of age, eggs from each treatment group were randomly collected, weighed, and incubated. Offspring from these treatments were randomly allocated to litter floor pens. Progeny were spaced at 23 CM.2 and were reared to 42 days. There was no significant (P > 0.05) difference in growth rate and feed conversion ratio in offspring from hens maintained on the litter floors versus …
Velocity Profile In Confined Elliptic Fractures, Stephen Ronald Pack Jr.
Velocity Profile In Confined Elliptic Fractures, Stephen Ronald Pack Jr.
Graduate Theses, Dissertations, and Problem Reports (ETD)
The primary objective of this research is to determine the friction inside a smooth fracture and to incorporate the effect of friction on a fluid transient inside a tapered-elliptical-confined fracture. In order to do so, the non-uniform velocity profile in an elliptic fracture with laminar flow of both Newtonian and non-Newtonian fluids was calculated. A transient flow computer program is presented using the method of characteristics, to show the frictional effects on acoustic damping. However for flow inside a hydraulic fracture, the 3D velocity profile is highly non-uniform, and the use of Vav creates an error as Vmax >> Vav. The …
Computer-Controlled Autonomous Model Car: A Mechatronics Project, Aparna Sachidanand
Computer-Controlled Autonomous Model Car: A Mechatronics Project, Aparna Sachidanand
Graduate Theses, Dissertations, and Problem Reports (ETD)
Mechatronics is a synthesis of mechanical engineering and electronic engineering, and computer engineering, distinct areas that overlap in the design of systems. It represents the interdisciplinary nature of design and development of today's products.;The current research focuses on the design, construction and testing of a computer controlled autonomous model car which can exhibit intelligent behavior such as timed course execution, obstacle detection, and response to sensor inputs. The car is intended as a mechatronics design project that will be integrated into an existing one-semester mechanical engineering undergraduate instrumentation course.;The car was designed around a microprocessor board (Tern Analog Drive) controlled …
Investigation Of The Formation Of Residual Ash On Candle Filters, Sharath J. Simha
Investigation Of The Formation Of Residual Ash On Candle Filters, Sharath J. Simha
Graduate Theses, Dissertations, and Problem Reports (ETD)
When coal undergoes combustion, not all the carbon in the coal may be consumed. This is due to improper mixing of reactants, proximity of cold surfaces and the desire to operate combustors at lower temperatures. Depending on the type of coal and the operating conditions of the combustor, there may be about 4--6% of unburned carbon in the refuse. This unburned carbon is carried along in the flow of gases and ash. If the combustion gas products are to pass through a high temperature gas filtration system, ash and unburned carbon are deposited on the wall of a candle filter. …
Computational Models Of Particle Size Effects On Brittle Oxide Scale Erosion, Ravi S. Tangirala
Computational Models Of Particle Size Effects On Brittle Oxide Scale Erosion, Ravi S. Tangirala
Graduate Theses, Dissertations, and Problem Reports (ETD)
Metals and alloys designed for machines at elevated temperatures have microstructures and chemistries optimized to provide strength and resistance to oxidation. The majority of the commercial high temperatures metal or alloys intended to use at temperatures below 850°C or so rely on the formation of a continuous surface layer of essentially oxide scale for further oxidation resistance. Erosion of these machine parts by the small solid particle entrained in the liquid or gaseous working environment is a serious problem in many industrial applications. Numerous experiments have been conducted to obtain empirical relations for predicting material loss during erosion and to …
Prediction Of Turbulent Mixing At The Interface Of Density Stratified, Shear Flows Using Cfd, Matthew Robert Umbel
Prediction Of Turbulent Mixing At The Interface Of Density Stratified, Shear Flows Using Cfd, Matthew Robert Umbel
Graduate Theses, Dissertations, and Problem Reports (ETD)
Numerical simulations were performed involving stratified, shear flows that have been investigated experimentally. One set of simulations dealt with a homogeneous shear flow involving miscible fluids. The other set of simulations dealt with a developing shear layer involving immiscible fluids. The re-fueling of a compensated fuel/ballast tank, which is partially characterized by a shear layer, was also simulated. In all the simulations a single fluid, scalar transport multiphase model and the k-epsilon turbulence model were used. In the simulations involving miscible fluids an interfacial thickness relationship given by delta/H∼(Ri*)--2.1 and an entrainment relationship given by E∼(Ri*)--1.1 were predicted. These relationships …
Pseudospectral Techniques For Non -Smooth Evolutionary Problems, Chris Palmer Guenther
Pseudospectral Techniques For Non -Smooth Evolutionary Problems, Chris Palmer Guenther
Graduate Theses, Dissertations, and Problem Reports (ETD)
A pseudospectral approach is used to solve non-smooth evolutionary problems using Fourier collocation and Chebyshev collocation. It is well known that pseudospectral methods for smooth problems can offer superior accuracy over finite difference and finite element methods.;This paper explores the use of pseudospectral methods for non-smooth evolutionary problems in the area of hyperbolic heat transfer. Boundary and initial conditions are considered which cause instantaneous jumps, in the temperature and flux, prior to the propagation of a thermal wave into the medium. There is a considerable amount of literature that has investigated hyperbolic heat transfer under similar conditions, the common problems …
Semi-Automated Modeling Approaches To Route Selection In Gis, Binfei Chen
Semi-Automated Modeling Approaches To Route Selection In Gis, Binfei Chen
Graduate Theses, Dissertations, and Problem Reports (ETD)
As an alternative to traditional graphical intuitive approaches (GIA), a semi-automated modeling approach (SMA) can more efficiently identify linear routes by using powerful iterative and automated methods. In this research, two case studies were investigated to examine critical issues relating to the accuracy and effectiveness of raster-defined algorithmic approaches to linear route location. The results illustrate that different shortest-path algorithms do not necessarily result in markedly different linear routes. However, differing results can occur when using different neighboring-cell links in the cell-based route network construction. Cell-based algorithmic approaches in both Arc/Info and IDRISI software generate very similar results which are …