Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Engineering (367)
- Social and Behavioral Sciences (282)
- Physical Sciences and Mathematics (237)
- Medicine and Health Sciences (193)
- Life Sciences (172)
-
- Arts and Humanities (128)
- Psychology (122)
- Education (85)
- Mechanical Engineering (80)
- Electrical and Computer Engineering (58)
- Civil and Environmental Engineering (54)
- Computer Engineering (53)
- Computer Sciences (53)
- Music (49)
- Aerospace Engineering (44)
- Environmental Sciences (44)
- Chemical Engineering (42)
- Chemistry (41)
- Dentistry (39)
- Physics (39)
- Communication (38)
- Earth Sciences (37)
- Operations Research, Systems Engineering and Industrial Engineering (37)
- Civil Engineering (34)
- Neuroscience and Neurobiology (34)
- Nursing (34)
- Astrophysics and Astronomy (31)
- Music Performance (31)
- Business (30)
- Clinical Psychology (29)
- Keyword
-
- Mechanical engineering (270)
- Computer science (173)
- Electrical engineering (168)
- Civil engineering (124)
- Clinical psychology (80)
-
- Aerospace engineering (77)
- Industrial engineering (69)
- Forestry (61)
- Chemical engineering (58)
- Ecology (56)
- Economics (52)
- Environmental engineering (52)
- Behavioral psychology (51)
- Machine Learning (48)
- Petroleum engineering (48)
- Dentistry (47)
- Educational psychology (44)
- Materials science (43)
- Mining engineering (43)
- Energy (41)
- Automotive engineering (40)
- Geology (40)
- Molecular biology (40)
- Aquatic sciences (39)
- Educational technology (38)
- Animal sciences (36)
- Curriculum development (36)
- Developmental psychology (36)
- Environmental science (36)
- Public health (36)
- Publication Year
- File Type
Articles 4471 - 4500 of 5173
Full-Text Articles in Entire DC Network
An Assessment Of Assertion Skills Among Adults With Mild Mental Retardation., Vicki Ann Lumley
An Assessment Of Assertion Skills Among Adults With Mild Mental Retardation., Vicki Ann Lumley
Graduate Theses, Dissertations, and Problem Reports (ETD)
Although assertion is a topic that has been the focus of a great deal of research, little attention has been paid to assertive behavior and individuals with mental retardation. The purpose of the current study was to assess the assertion skills of adults with mild mental retardation using comparison samples of high assertive and low assertive college students. Indirect assessment measures (i.e., self-report), direct behavioral measures (i.e., role-play assessment), and social validity ratings (i.e., ratings of interpersonal attractiveness provided by blind raters) were used, and the results compared. Self-report assessment was found to be an acceptable method of evaluating assertion …
The Effectiveness Of Residential Facilities For The Treatment Of Disruptive Behavior Disorders., Michelle Colette Hainesworth
The Effectiveness Of Residential Facilities For The Treatment Of Disruptive Behavior Disorders., Michelle Colette Hainesworth
Graduate Theses, Dissertations, and Problem Reports (ETD)
Disruptive Behavior Disorders (DBDs) consist of four categories of syndromes known as Attention Deficit Hyperactivity Disorder (ADHD), Oppositional Defiant Disorder (ODD), Conduct Disorder (CD), and DBD Not Otherwise Specified (NOS). They are the most prevalent disorders in children and adolescents and the most common reason for referral to residential treatment centers (RTC). However, little research exists concerning RTCs efficacy in treating disruptive behavior. The following study attempted to take a comprehensive approach in that it evaluated the effectiveness of an RTC, including the specific treatments that contributed to a positive outcome. The study also took the investigation a step further …
Student Achievement And School Condition: Examining The Relationship In West Virginia's High Schools., Lyn G. Guy
Student Achievement And School Condition: Examining The Relationship In West Virginia's High Schools., Lyn G. Guy
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to determine what relationship, if any, existed between building condition and student achievement in West Virginia's high schools. Since every West Virginia school district was required to submit a Comprehensive Education Facility Plan (CEFP) for the next ten years to the State School Building Authority in January of 2000, the research used the facility evaluation instruments that were a part of this document. Building condition comprised the three facility evaluations that are part of the CEFP as well as the age of the building, the density of the student population, and the size of …
An Investigation Of Teachers' Temperament And Students' Perceptions Of Teachers: Communication Behavior And Students' Attitudes Toward Teachers., Kristin Marie Valencic
An Investigation Of Teachers' Temperament And Students' Perceptions Of Teachers: Communication Behavior And Students' Attitudes Toward Teachers., Kristin Marie Valencic
Graduate Theses, Dissertations, and Problem Reports (ETD)
This study examined relationships among the way teachers communicate in the classroom, teachers temperaments, and perceptions of teachers by students. Specifically, the first goal was to determine to what extent a teacher's levels of extraversion, neuroticism, and psychoticism can predict students perceptions of task attraction, immediacy, assertiveness, responsiveness, and credibility. The second goal was to determine the relationships between teacher temperament and teacher evaluations, affective learning, and cognitive learning. Self-report surveys of 52 teachers and 1242 students across seven disciplines at West Virginia University were collected. Instructors received measures of extraversion, neuroticism, and psychoticism. Teachers were asked to rate themselves …
The Job Satisfaction Level Of Chinese And Indian-Born Engineering Faculty At A Research I University., Susan Mary Madhavan
The Job Satisfaction Level Of Chinese And Indian-Born Engineering Faculty At A Research I University., Susan Mary Madhavan
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to assess the job satisfaction level of Engineering faculty from India, Taiwan, and the People's Republic of China at a Research I University. Analysis was based on how academic rank, country of origin, or gender affected their level of job satisfaction and their degree of adjustment to the department, the college or the university as a whole. The following factors were assessed: teaching, research, recognition, workload, physical surroundings, reward systems, administration, collegiality and service. Structured interviews were conducted and taped of twenty faculty members at the study institution, detailing the above factors. An overall …
The Effects Of Framing On Older And Younger Adults' Medical Decision-Making., Deborah Rettig Mckee
The Effects Of Framing On Older And Younger Adults' Medical Decision-Making., Deborah Rettig Mckee
Graduate Theses, Dissertations, and Problem Reports (ETD)
This 2 phase study was designed to explore age-related differences in medical treatment choices due to a framing effect (survival and mortality wording affecting the choice made) and due to the influence of physician recommendations. One hundred and thirty-seven older adults and 166 younger adults completed two medical treatment questionnaires, a demographic questionnaire, and a brief math quiz. In phase 1, the medical treatment questionnaire presented options for treatment of cancer (surgery and radiation) in mortality and survival wording. In phase 2, the treatment options were presented with and without a physician recommendation. Both older and younger adults made different …
A Study Of The Effects Of The Posse Technique On The Perceptions Of Pre-Service Teachers In Teaching Learning Disabled Students., Kim H. Rotruck
A Study Of The Effects Of The Posse Technique On The Perceptions Of Pre-Service Teachers In Teaching Learning Disabled Students., Kim H. Rotruck
Graduate Theses, Dissertations, and Problem Reports (ETD)
This study seeks to establish a benchmark on the perceptions of pre-service teachers (interns) in order to understand the factors influencing successful teaching of disabled students in the general education classroom. With the extensive body of research that indicates general educators request more training to teach disabled students, this study begins with four interns and generates information about the effects of a specific technique designed for teaching learning disabled students and observes the interns' perceptions as they teach learning disabled students. This technique predicts, organizes, searches, summarizes, and evaluates expository text (POSSE), which is characteristic of many effective reading techniques. …
The Institutional Production Of Literary Value: Studies Of African-American Popular Music Lyrics And The Avant-Garde., Carl Silvio
The Institutional Production Of Literary Value: Studies Of African-American Popular Music Lyrics And The Avant-Garde., Carl Silvio
Graduate Theses, Dissertations, and Problem Reports (ETD)
Recent decades have witnessed series of debates over the nature of the texts studied by literary studies. Some argue that the literary text is first and foremost defined by its aesthetic value, while others claim that the discipline should regard its object as a social document which reveals information about the society that produced it and exerts an ideological effect upon its cultural context. These debates, between what are usually termed “traditional†and “cultural studies†approaches to literature reveal a central contradiction that has divided the discourse of aesthetic value since its formulation in the Eighteenth century. The question of …
Improving Medication Adherence For Children With Asthma: Objective Monitoring And Feedback As An Intervention For Inhaled Corticosteroid Use., Scott Allen Spaulding
Improving Medication Adherence For Children With Asthma: Objective Monitoring And Feedback As An Intervention For Inhaled Corticosteroid Use., Scott Allen Spaulding
Graduate Theses, Dissertations, and Problem Reports (ETD)
Nonadherence to asthma medication is a persistent problem. Contingency management has been used to improve pediatric compliance to inhaled corticosteroids. But token systems require time and attention to design and maintain, creating a challenge for busy outpatient clinics. The purpose of the present study was to evaluate the effectiveness of an intervention that might more easily be implemented by medical staff and parents: objective monitoring of medication use and feedback regarding errors in technique and compliance as an intervention to improve children's adherence to inhaled corticosteroids. Pediatric patients diagnosed with bronchial asthma for at least 6 months, receiving long-term corticosteroid …
Psychophysiological Responses Of Older Adults To An Anxiety -Evoking Stimulus, Angela W. Lau
Psychophysiological Responses Of Older Adults To An Anxiety -Evoking Stimulus, Angela W. Lau
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to clarify the relation between anxiety and physiological responses in older adults as compared to younger adults. Heart rate (HR), skin conductance level (SCL), skin conductance response (SCR), systolic blood pressure (SBP), and diastolic blood pressure (DBP) were obtained before, during, and after exposure to a Stroop color-word naming task and a snake video from 46 female younger adults (age 18--30) and 28 female older adults (age 65--80) who were designated as either snake fearful or snake nonfearful. No significant group differences were observed on physiological measures to baseline one or during the snake …
Prognostic Factors For Treatment Outcome In Young Children With Autism, Susannah Grimm Poe
Prognostic Factors For Treatment Outcome In Young Children With Autism, Susannah Grimm Poe
Graduate Theses, Dissertations, and Problem Reports (ETD)
Over the past decade, systematic applications of Applied Behavior Analysis (ABA) have proven an effective means of improving the prognosis for many young children with autism. But in every study indicating that a number of participants have experienced good outcomes from these interventions, there remain a sizeable number of participants who have not had the same success. This study was undertaken to examine the differences between the parental rankings for each of eight characteristics across three points in time for children with autism to determine who succeeds with this kind of treatment and who does not. These parental reports were …
Improving The Simulation Of A Waterflooding Recovery Process Using Artificial Neural Networks, Edison Gil
Improving The Simulation Of A Waterflooding Recovery Process Using Artificial Neural Networks, Edison Gil
Graduate Theses, Dissertations, and Problem Reports (ETD)
The waterflood performance of the dual five-spot pilot project in the Stringtown oil field, situated in West Virginia, has been studied. A numerical simulator, called BOAST98, was used for the simulation purposes, after developing a reservoir description.;The producing horizon in the field is the Upper Devonian Gordon sandstone, which is characterized by severe heterogeneity due to the depositional environment. Using available core and log data and geological analysis, a reservoir characterization study was done. A preliminary reservoir description based on log porosity-core permeability correlation was improved by developing Artificial Neural Networks (A.N.N.), which incorporates geophysical well log information. These A.N.N.'s …
Improving Commercial Vehicle Crash Data Quality In West Virginia, Kris Sean Gillespie
Improving Commercial Vehicle Crash Data Quality In West Virginia, Kris Sean Gillespie
Graduate Theses, Dissertations, and Problem Reports (ETD)
The purpose of this study was to identify methods to improve commercial carrier crash data in West Virginia including coal trucks. All organizations and agencies involved with commercial carrier safety need ready access to basic data describing the crash-involved operator, vehicle, and environment. Such data are necessary to any programmatic or engineering countermeasures. The basic approach used to accomplish the research objectives involved a series of regional meetings where law enforcement personnel expressed their opinions about ways to improve commercial vehicle crash data quality. These results were then weighted and prioritized. The top five solutions generated at these meetings were: …
Optimization Of A Roll Over Protective Structure (Rops) Using Nonlinear Finite Element Analysis, Adam Michael Gillispie
Optimization Of A Roll Over Protective Structure (Rops) Using Nonlinear Finite Element Analysis, Adam Michael Gillispie
Graduate Theses, Dissertations, and Problem Reports (ETD)
The use of a conventional Roll Over Protective Structure CROPS) on farm tractors over the years has saved numerous lives and prevented countless injuries. By removing the ROPS, the tractor operators place themselves in unwarranted danger.;This led the National Institute for Occupational Safety and Health (NIOSH) and West Virginia University Mechanical and Aerospace Engineering to the development of a deployable ROPS, which could remain down to aid in required housing space for the tractor and prevent debris from striking the tractor operator while being driven.;This research effort focuses on the application of computer-aided design and analysis to structurally optimize the …
Predicting A Detailed Permeability Profile From Minipermeameter Measurements And Well Log Data, Shawn D. Nines
Predicting A Detailed Permeability Profile From Minipermeameter Measurements And Well Log Data, Shawn D. Nines
Graduate Theses, Dissertations, and Problem Reports (ETD)
Permeability, along with the porosity, comprises one of the two most important properties in petroleum engineering with respect producing hydrocarbon fluids.;It is standard practice in the petroleum industry to determine permeability in one of two ways. These are pressure transient testing and core analysis. Both methods are expensive in their own ways. This research focuses on a way to minimize or limit the need for both of these testing procedures.;The purpose of this research was to utilize well log data, mainly gamma ray and density, Minipermeameter values, and basic information such as depth and spatial coordinates to predict permeability in …
Alexander Von Humboldt And Nineteenth-Century Ideas On The Origin Of American Indians, Michael Anthony Wadyko
Alexander Von Humboldt And Nineteenth-Century Ideas On The Origin Of American Indians, Michael Anthony Wadyko
Graduate Theses, Dissertations, and Problem Reports (ETD)
This dissertation revolves around Alexander von Humboldt's research on Indian origins. Humboldt conducted investigations on Indians during his precedent-setting scientific expedition to Meso- and South America during the years 1799--1804. Officially sponsored by the Spanish crown, the main purposes for this expedition were twofold: to examine, evaluate, and discredit Buffon's "degeneracy" claims about America and its inhabitants, and to gather empirical evidence on geography, climate, flora, fauna, and the indigenous cultures. From these results Humboldt published three major works about the expedition, particularly a thirty-volume work condensed to two volumes, Vues de Cordilleres et monuments des peuples d' Amerique.;From this …
Development Of A Membrane Resistance Based Modeling Framework For Comparison Of Ultrafiltration Processes, David Albert Masciola
Development Of A Membrane Resistance Based Modeling Framework For Comparison Of Ultrafiltration Processes, David Albert Masciola
Graduate Theses, Dissertations, and Problem Reports (ETD)
A parametric study was conducted to develop a more general modeling framework as a basis for comparison of ultrafiltration membrane modules and separation processes. Discrete experiments were performed to examine the effects of operating parameters on permeate flux behavior in the tubular and high-shear rotary ultrafiltration (HSRUF) systems using a synthetic metal working (MW) fluid as a surrogate feed stream due to its relevance in industrial process and treatment applications. The conventional thin-film model was successfully applied to permeate flux data collected at low feed oil concentrations; however, model predictions at high concentrations were physically meaningless due to the formation …
Assessing Computer -Mediated Communication Discourse Of A Traumatic Brain Injury Survivor, Cheryl L. Fickey Prichard
Assessing Computer -Mediated Communication Discourse Of A Traumatic Brain Injury Survivor, Cheryl L. Fickey Prichard
Graduate Theses, Dissertations, and Problem Reports (ETD)
Speech-language pathologists and audiologists have begun using computer technology for information storage and retrieval and as one means of providing clinical services to communication-disordered patients. The purpose of this study is to develop a protocol to assess the written communication of brain-injured clients whose communication therapy milieu includes interactions with the world outside the treatment room through computer-mediated communication (CMC).;A panel of experts reviewed a series of discourse analysis procedures and rated their perceptions of validity, reliability, and ease-of use for the procedures as means of evaluating CMC discourse. The Computer-Mediated Communication Evaluation Protocol (CMC-EP) was developed based on the …
Teacher Videotaping As A Method Of Self -Assessing Questioning Skills In Secondary Public Schools, Stephen Alan Alberts Ii
Teacher Videotaping As A Method Of Self -Assessing Questioning Skills In Secondary Public Schools, Stephen Alan Alberts Ii
Graduate Theses, Dissertations, and Problem Reports (ETD)
Primarily this action research project was designed to hone my ability to Socratically question students by reflecting on my teaching through the lens of a videocamera---while reconciling my own paradigm with as many outside assessment devices as possible. The paramount consideration of my questioning/framing references was to incite students to think critically (see Pedagogical Skills Honed in chapter seven). The higher priorities of the outside assessors, on the other hand, were more political than instructional in nature (see Reconciling Multiple Assessments in chapter seven).;Scrutinizing and improving my questioning skills (the focus of the research) led to the epiphany that the …
Formal Specification Of Requirements For Analytical Redundancy-Based Fault -Tolerant Flight Control Systems, Diego Del Gobbo
Formal Specification Of Requirements For Analytical Redundancy-Based Fault -Tolerant Flight Control Systems, Diego Del Gobbo
Graduate Theses, Dissertations, and Problem Reports (ETD)
Flight control systems are undergoing a rapid process of automation. The use of Fly-By-Wire digital flight control systems in commercial aviation (Airbus 320 and Boeing FBW-B777) is a clear sign of this trend. The increased automation goes in parallel with an increased complexity of flight control systems with obvious consequences on reliability and safety. Flight control systems must meet strict fault-tolerance requirements. The standard solution to achieving fault tolerance capability relies on multi-string architectures. On the other hand, multi-string architectures further increase the complexity of the system inducing a reduction of overall reliability.;In the past two decades a variety of …
Voltage Collapse Prediction For Interconnected Power Systems, Amer S. Al-Hinai
Voltage Collapse Prediction For Interconnected Power Systems, Amer S. Al-Hinai
Graduate Theses, Dissertations, and Problem Reports (ETD)
A steady state analysis is applied to study the voltage collapse problem. The modal analysis method is used to investigate the stability of the power system. Q-V curves are used to confirm the obtained results by modal analysis method and to predict the stability margin or distance to voltage collapse based on reactive power load demand. The load characteristics are considered in this research. Different voltage dependent loads are proposed in order to be used instead of the constant load model. The effect of induction machine load is considered in this study. The load is connected to several selected buses.;The …
Design, Construction, And Evaluation Of Coal Extraction Pilot Plant To Manufacture Coal-Based Carbon Pitch, Brian Wayne Bland
Design, Construction, And Evaluation Of Coal Extraction Pilot Plant To Manufacture Coal-Based Carbon Pitch, Brian Wayne Bland
Graduate Theses, Dissertations, and Problem Reports (ETD)
A solvent extraction technique for removing mineral matter, including the inorganic sulfur, from coal has been developed by the Department of Chemical Engineering at WVU. The extraction is preformed at mild conditions (202°C and atmospheric pressure) using the solvent N-Methyl-2-Pyrrolidone (NMP). Laboratory results have shown that this technique yields a clean coal product containing less than 1 percent ash and virtually no inorganic sulfur.;This research was conducted for further process design and economic development of an industrial-scale extraction process.;This research reported the possibility of production scale processing by constructing a pilot plant. The pilot plant was used to explore the …
Evaluation Of Opacity, Particulate Matter, And Carbon Monoxide From Heavy-Duty Diesel Transient Chassis Tests, Ronald Page Jarrett
Evaluation Of Opacity, Particulate Matter, And Carbon Monoxide From Heavy-Duty Diesel Transient Chassis Tests, Ronald Page Jarrett
Graduate Theses, Dissertations, and Problem Reports (ETD)
Opacity and emission data were collected from heavy-duty diesel engines exercised through snap-acceleration tests and transient chassis dynamometer tests. Emission data were gathered using the West Virginia University (WVU) Transportable Heavy Duty Vehicle Emission Testing Laboratories (THDVETL) and opacity data were collected from two opacity meters; the Wager 650CP full flow opacity meter and the Bosch RT 100 partial flow opacimeter. Results showed that the Bosch peak opacity readings were consistently higher than the Wager peak opacity readings, and both meters showed little correlation with filter-captured particulate matter (PM). It was also observed that the snap-acceleration test did not identify …
Parallelization Of Ecg Template-Based Abnormality Detection, Sherry Lea Kratsas
Parallelization Of Ecg Template-Based Abnormality Detection, Sherry Lea Kratsas
Graduate Theses, Dissertations, and Problem Reports (ETD)
In order to develop techniques to predict cardiac arrest, long-term study of electrocardiogram (ECG) data needs to be done to detect changes in electrical activity of diseased hearts. In the past, limitations of computing power and storage space restricted the duration of long-term studies to several days. However, with today's technological advancement, data collection can be extended to months or years. The goal of this thesis research is to evaluate several alternatives for distributing the analysis of ECG data over multiple processors. Parallel algorithms utilizing Correlation Waveform Analysis (CWA) were implemented to compare individual heartbeats and form heartbeat templates. The …
Development And Evaluation Of Glass Fiber-Reinforced Composite/Wood Railroad Crossties, Krit Laosiriphong
Development And Evaluation Of Glass Fiber-Reinforced Composite/Wood Railroad Crossties, Krit Laosiriphong
Graduate Theses, Dissertations, and Problem Reports (ETD)
Railroad crossties are strengthened by wrapping glass fiber reinforced composites (GFRC). In addition, durability of crossties has been found to have enhanced by reinforcing them with GFRC wraps. In order to reduce the cost, GFRC wraps are not used to wrap the entire length of a crosstie, but only in the region that holds steel plates. The objective of this research is to select compatible adhesive between creosote treated wood and glass fabric, and study the performance of wrapped wooden crossties.;Five primer/resin combinations (Resorcinol Formaldehyde group) were screened for strength and durability of treated wood crossties. To evaluate stiffness and …
Approaches To Creating Anonymous Patient Database, Shijun Shen
Approaches To Creating Anonymous Patient Database, Shijun Shen
Graduate Theses, Dissertations, and Problem Reports (ETD)
Health care providers, health plans and health care clearinghouses collect patient medical data derived from their normal operations every day. These patient data can greatly benefit the health care organization if data mining techniques are applied upon these data sets. However, individual identifiable patient information needs to be protected in accordance with Health Insurance Portability and Accountability Act (HIPAA), and the quality of patient data also needs to be ensured in order for data mining tasks achieve accurate results. This thesis describes a patient data transformation system which transforms patient data into high quality and anonymous patient records that is …
Hazardous Materials Database, Veena Vadiala
Hazardous Materials Database, Veena Vadiala
Graduate Theses, Dissertations, and Problem Reports (ETD)
Handling and disposal of a retired object can be a major component of its Life Cycle Cost. Often, during dismantling of a retired object many hazardous materials are released. Disposal of hazardous materials also need to comply with various federal regulations. Agencies like Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA) set these safety regulations. It is possible to apply generic exposure and release controls to protect workers from hazardous materials. For the most cost effective hazard controls it is necessary first to identify the materials and their properties of primary concern. There is a need …
Diversity Of Ectomycorrhizal Fungi On Two Reclaimed Surface Mines Differing In Soil Properties, Betsy S. Kurnik
Diversity Of Ectomycorrhizal Fungi On Two Reclaimed Surface Mines Differing In Soil Properties, Betsy S. Kurnik
Graduate Theses, Dissertations, and Problem Reports (ETD)
I analyzed community structure of ectomycorrhizal fungi on white pine (Pinus strobus) on two reclaimed surface mines in eastern Ohio. One site was acidic and metal-stressed, the other was alkaline. Completely different community composition was found on the two sites by PCR/ITS/RFLP analyses of field collected mycorrhizae. However, Shannon-Wiener index values indicated that the two communities were equally diverse. A population of isolates of one species common to both sites was obtained from trap cultures planted with white pine. The identity of this species as Wilcoxina mikolae was established through DNA sequencing of the ITS region. The W. mikolae populations …
Evaluation Of Maternal Serum Triple Screen As An Identifier Of Trisomy 21 Pregnancy, Jonnie Ann Lane
Evaluation Of Maternal Serum Triple Screen As An Identifier Of Trisomy 21 Pregnancy, Jonnie Ann Lane
Graduate Theses, Dissertations, and Problem Reports (ETD)
Maternal serum triple screen is used to identify women less than 35 years of age who are at an increased risk of having a fetus with Down syndrome. The screen identifies 5% of women tested as being at an increased risk but only 2--3% of these women actually have a fetus with chromosome abnormalities, indicating a high false positive rate. Medical records for 900 cases referred for maternal serum triple screen and maternal age were reviewed. The percentages of abnormal karyotypes in the two populations were not significantly different from each other or the expected value. While 3% of all …
Synthesis And Characterization Of Metal Oxide Nanoparticles, Heidi Jo Magnone
Synthesis And Characterization Of Metal Oxide Nanoparticles, Heidi Jo Magnone
Graduate Theses, Dissertations, and Problem Reports (ETD)
Nanoparticles of CuO, Co3O4 and Mn5O 8 were prepared via sol-gel chemical routes. Thermal treatments of the gels were used to obtain particles of different sizes, as determined by the widths of the Bragg lines in x-ray diffraction. To prepare CuO nanoparticles, a Cu(OH)2 gel was first produced by reacting copper nitrate with sodium hydroxide, followed by annealing the gel at temperatures between 160°C to 1,000°C to produce particles in the 6 to 36 nm range. Nanoparticles of Co3O4 in the size range of 9 to 45 nm were prepared in an analogous manner by reacting cobalt nitrate and sodium …