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

Digital Commons Network™

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

2013

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 7501 - 7530 of 130290

Full-Text Articles in Entire DC Network

Liquid Chromatography -- Tandem Mass Spectrometry Techniques For Drugs Of Abuse As Applied To Bacterial And Forensic Toxicology, Stephanie Marie Martindale Dec 2013

Liquid Chromatography -- Tandem Mass Spectrometry Techniques For Drugs Of Abuse As Applied To Bacterial And Forensic Toxicology, Stephanie Marie Martindale

Graduate Theses, Dissertations, and Problem Reports (ETD)

The ability of bacterial species to transform complex chemical substances has been well documented. Some of these species are native to the human gastrointestinal tract and play an active role in the postmortem decomposition process. These species have potential to cause biotransformations that affect compound-to-metabolite ratios within the human body, especially after death. Postmortem changes such as these have rarely been evaluated or taken into consideration but they have potential to supply valuable information, especially concerning compound identification and confirmation.;The purpose of this research was to investigate the effects of Escherichia coli, Bacteroides fragilis, and Clostridium perfringens on drugs of …

Go to article

Numerical And Experimental Study On The Ability Of Dynamic Roughness To Alter The Development Of A Leading Edge Vortex, Christopher D. Griffin Dec 2013

Numerical And Experimental Study On The Ability Of Dynamic Roughness To Alter The Development Of A Leading Edge Vortex, Christopher D. Griffin

Graduate Theses, Dissertations, and Problem Reports (ETD)

Dynamic stall is an unsteady aerodynamic phenomenon garnering much research interest because it occurs in a variety of applications. For example, dynamic stall is known to occur on helicopter rotor blades, wind turbines, high maneuvering military aircraft, and flapping wings. Dynamic stall occurs when an aerodynamic lifting device, such as an airfoil, wing, or turbomachine blade, undergoes a rapid pitching motion. It also occurs on lifting devices that are impulsively started at high angles of attack. Dynamic stall can "delay" aerodynamic stall to angles of attack that are significantly beyond the static stall angle of attack.;During dynamic stall a large …

Go to article

Modeling An Adaptive System With Complex Queuing Networks And Simulation, Jesse C. Musgrove Dec 2013

Modeling An Adaptive System With Complex Queuing Networks And Simulation, Jesse C. Musgrove

Graduate Theses, Dissertations, and Problem Reports (ETD)

An adaptive system differs from a non-adaptive system in that an adaptive system uses a specific process to identify and implement adaptations to system parameters during run time in an effort to increase system performance.;In order to develop an adaptive system one of the most important aspects is the ability to accurately predict and manage system behavior. If an unexpected event has occurred, accurate prediction of system behavior is needed in order to determine whether or not the system is able to continually meet expectations and/or requirements. When considering any possible adaptations to the system, one must be able to …

Go to article

Human Metrology For Person Classification And Recognition, Deng Cao Dec 2013

Human Metrology For Person Classification And Recognition, Deng Cao

Graduate Theses, Dissertations, and Problem Reports (ETD)

Human metrological features generally refers to geometric measurements extracted from humans, such as height, chest circumference or foot length. Human metrology provides an important soft biometric that can be used in challenging situations, such as person classification and recognition at a distance, where hard biometric traits such as fingerprints and iris information cannot easily be acquired. In this work, we first study the question of predictability and correlation in human metrology. We show that partial or available measurements can be used to predict other missing measurements. We then investigate the use of human metrology for the prediction of other soft …

Go to article

Classification And Mapping Of Recreation And Ecotourism Areas In West Virginia, Ishwar Dhami Dec 2013

Classification And Mapping Of Recreation And Ecotourism Areas In West Virginia, Ishwar Dhami

Graduate Theses, Dissertations, and Problem Reports (ETD)

Travel and tourism are recognized as the largest and fastest growing economic sector in the world. Different recreational and tourism sites can provide different types of activities based on their unique characteristics. Like any other form of tourism, the growth of ecotourism is dependent on the flow of visitors and therefore, marketing for a destination requires identifying various characteristics of the destination and preferences of stakeholders. The main aim of this dissertation is to classify and map recreation and ecotourism areas in West Virginia. The dissertation is presented in the form of three essays. The first essay classifies and maps …

Go to article

Altered Hemodynamic Control In The Skeletal Muscle Microcirculation In The Metabolic Syndrome: The Emergence Of A New Attractor, Joshua Thomas Butcher Dec 2013

Altered Hemodynamic Control In The Skeletal Muscle Microcirculation In The Metabolic Syndrome: The Emergence Of A New Attractor, Joshua Thomas Butcher

Graduate Theses, Dissertations, and Problem Reports (ETD)

Peripheral vascular disease is a pathological disease state whereby the peripheral vascular system becomes progressively limited in its ability to adequately perfuse extremities despite increases in metabolic demand. One of the primary risk factors for development of peripheral disease is the Metabolic Syndrome. It is the presentation of three simultaneous comorbidities, with obesity being the most common denominator in most metabolic syndrome patients, but also including a pro-inflammatory state, pro-oxidant state, pro-thrombotic state, increased blood pressure, atherogenic dyslipidemia, or insulin resistance. Currently, the population of the United States is approximately 75% overweight, obese, or extremely obese and the prevalence of …

Go to article

Science Teaching Efficacy Beliefs And The Lived Experience Of Preservice Elementary Teachers, Karen A. Kettler Dec 2013

Science Teaching Efficacy Beliefs And The Lived Experience Of Preservice Elementary Teachers, Karen A. Kettler

Graduate Theses, Dissertations, and Problem Reports (ETD)

The current study utilized a mixed methods approach to examine the science teaching efficacy beliefs (STEB) of preservice elementary teachers as they participated in a Science Methods course. The following questions were addressed using quantitative survey data and qualitative interviews: What are the STEB of preservice elementary teachers as they progress through a Science Methods course?; How do the STEB of preservice elementary teachers with higher and lower personal science teaching efficacy (PSTE) beliefs change as they progress through a Science Methods course?; What is the nature of the lived experiences of preservice elementary teachers with higher and lower PSTE …

Go to article

Amine Nucleophilic Addition To Nitro-Alkene As A New Reaction Mode For The Synthesis Of N-Heterocycles, Lekh Nath Sharma Gautam Dec 2013

Amine Nucleophilic Addition To Nitro-Alkene As A New Reaction Mode For The Synthesis Of N-Heterocycles, Lekh Nath Sharma Gautam

Graduate Theses, Dissertations, and Problem Reports (ETD)

Amine Nucleophilic Addition to Nitro-alkene as a New Reaction Mode for the Synthesis of N-heterocycles: An efficient stereoselective synthesis of polycyclic lactams has been developed using Michael addition of conjugated amino-esters to nitro-alkenes. Using acyclic and cyclic aminoesters, this method provided a promising approach to the synthesis of bicyclic and tricyclic lactam core (5,5; 6,5; 5,5,5; 5,6,5; 6,5,5; 6,6,5 etc) in moderate to excellent yield (up to 95%) and excellent diastereoselectivities (up to 99:1 dr). The key steps in this asymmetric synthesis include a heteroatom Michael-Michael addition followed by reductive amidation to gamma-lactams. Lactam cores are biologically active broad spectrum …

Go to article

Development Of A 16s Rrna Gene Sequence As A Biomarker Specific To The Gastrointestinal Tract And Feces Of Swine Based On Suppressive Subtractive Hybridization, Autumn Sayre Dec 2013

Development Of A 16s Rrna Gene Sequence As A Biomarker Specific To The Gastrointestinal Tract And Feces Of Swine Based On Suppressive Subtractive Hybridization, Autumn Sayre

Graduate Theses, Dissertations, and Problem Reports (ETD)

Fecal contamination of water bodies causes environmental issues and human health risks. Swine are a major contributor of fecal inputs to environmental waters due to their importance in American agriculture. Water quality currently is regulated using fecal coliforms, which have natural reservoirs in the environment and may not correlate with pathogens. In recent years there has been a shift towards microbial source tracking (MST). MST employs microbiological, genotypic, phenotypic and chemical methods to determine the source of fecal pollution in water bodies. Previous studies aimed at developing swine fecal biomarkers have had limited success. The overall objective of this research …

Go to article

A Critical Spatial Econometric Counter Analysis Of The Impact Of New Toxic Facilities On Local Wages, Clinton E. Davis Dec 2013

A Critical Spatial Econometric Counter Analysis Of The Impact Of New Toxic Facilities On Local Wages, Clinton E. Davis

Graduate Theses, Dissertations, and Problem Reports (ETD)

Hegemonic assumptions and industry claims regarding the benefits of new toxic industrial facilities on local wages are tested and challenged. Analysis is performed by applying GIScience and Spatial Econometric methods within a critical framework. A call is made to develop more broadly the practice of Counter Analysis, which is presented as an analogue of Counter-Mapping that repurposes Spatial Analytic methods for the pursuit of critical research agendas.

Go to article

The Impact Of Service Learning On Leadership Skills Of Students Who Are Gifted And Talented In The Middle School, Patricia Anne Coon Dec 2013

The Impact Of Service Learning On Leadership Skills Of Students Who Are Gifted And Talented In The Middle School, Patricia Anne Coon

Graduate Theses, Dissertations, and Problem Reports (ETD)

This investigation relates to the impact of service learning on leadership skills of students who are gifted in the middle school while the students plan the project in-school and execute their goals out-of-school for their yearlong service learning project called Community Problem-Solving, or CmPS. Based on surveys, observations, and interviews from 25 students identified as gifted in the middle school, this study describes the student responses and observations from the researcher and teacher of the gifted. Findings show that most of the students in the study felt that their yearlong service learning project positively impacted their leadership skills. The data …

Go to article

American Grail: Contemporary Federal Budget Reform, Velda Frisco Dec 2013

American Grail: Contemporary Federal Budget Reform, Velda Frisco

Graduate Theses, Dissertations, and Problem Reports (ETD)

Federal budget reforms initiated by the executive branch of government have been unsustainable. A commonality of these failed reforms is that they lack the support of Congress. The objective of this research is to determine whether the Program Assessment Rating Tool (PART), the most recent executive-initiated budget reform, was supported by Congress. The scope of this research includes an exploration of historic budget reforms, initiated from 1921 through 2008, to provide insight into previous reform sustainability.;Budget reforms provide context from which to view the power struggle between the executive and legislative branches of government; the tension of separate institutions sharing …

Go to article

Continuities On Subspaces, Timothy James Glatzer Dec 2013

Continuities On Subspaces, Timothy James Glatzer

Graduate Theses, Dissertations, and Problem Reports (ETD)

We define a generalized continuity by declaring that for any family S of subsets of a topological space X, a function f : X → Y is S -continuous if for each S∈ S , the function f ↾ S : S → Y is continuous. This is easily seen to generalize such well known concepts as separate continuity and linear continuity. Using this definition as a way to unify several disparate results, we attempt to create a theory of S -continuity. As a part of this program, we give constructions for S -continuous functions for several natural classes S …

Go to article

Influence Of Weight Loss On Metabolic And Mitochondrial Function In The Mature Horse, Jennie L. Zambito Dec 2013

Influence Of Weight Loss On Metabolic And Mitochondrial Function In The Mature Horse, Jennie L. Zambito

Graduate Theses, Dissertations, and Problem Reports (ETD)

Obesity causes a multitude of metabolic issues in the horse, yet stepwise alterations in glucose and lipid metabolism, mitochondrial capacity and oxidant status during weight loss have yet to be analyzed. Skeletal muscle contains subsarcolemmal (SSM) and interfibrillar (IFM) mitochondria, which respond differently to physiological stimuli, impacting tissue and whole body oxidant status. We hypothesized that 8 light-type horses would display improvements in skeletal muscle mitochondrial subpopulation function and decreases in circulating oxidant status markers during weight loss from an obese (7 to 8) to moderate (5) body condition score (BCS). Additionally, we hypothesized improvements in morphometric measurements, circulating metabolic …

Go to article

Compositional Techniques In Hodie By Ralph Vaughan Williams, Ah Reum Han Dec 2013

Compositional Techniques In Hodie By Ralph Vaughan Williams, Ah Reum Han

Graduate Theses, Dissertations, and Problem Reports (ETD)

Hodie (This day) is Vaughan Williams's last large choral work. It is important because Vaughan Williams used not only complicated and innovative compositional techniques but also the largest instrumentation among his choral-orchestral compositions. It gives a challenging opportunity for composers who wish to learn innovative compositional techniques for vocal or choral-orchestral music. This research project will present Vaughan Williams's compositional techniques in a major choral-orchestral composition consisting of multiple movements. First, unification as a compositional method to link multiple movements by using recurring musical themes will be examined. Secondly, the treatment of biblical and non-biblical texts will be studied. Therefore, …

Go to article

Exploring A Prefigurative Culture In The Immigrant Family: A Look At The Sociolinguistic Impact Of Children On The Immigrant Parent, Melissa Katherine Mcintosh Dec 2013

Exploring A Prefigurative Culture In The Immigrant Family: A Look At The Sociolinguistic Impact Of Children On The Immigrant Parent, Melissa Katherine Mcintosh

Graduate Theses, Dissertations, and Problem Reports (ETD)

According to the U.S. Census Bureau (2010), 12.9% of the population in the United States is that of immigrants. With this increase in recent immigration, the population of limited English speakers has also increased which includes both children and adults. While much research has been done in terms of how bilingualism and biculturalism have impacted the children within immigrant families, very few studies have focused on the parents and how the children's English language learning and acculturation have impacted their own English learning and acculturation. This study was intended to fill that lack of research by exploring the sociolinguistic impact …

Go to article

Emotion Regulation And Cardiovascular Response To Emotion Provocation: Reappraisal Versus Suppression, Casey E. Cavanagh Dec 2013

Emotion Regulation And Cardiovascular Response To Emotion Provocation: Reappraisal Versus Suppression, Casey E. Cavanagh

Graduate Theses, Dissertations, and Problem Reports (ETD)

Emotion regulation is a process through which individuals alter the subjective, behavioral and physiological responses to emotional experiences. Within the emotion regulation model, reappraisal and suppression are two strategies that have been studied extensively. However, this research has largely ignored the effects of individual differences in emotion regulation when examining reappraisal and suppression. The purpose of this study was to examine individual differences in reappraisal and suppression (e.g., one's preferred emotion regulation strategy) as well as examining the effects of instructional use of reappraisal and suppression. In the present study, participants, classified as habitual reappraisers and habitual suppressors, engaged in …

Go to article

American Indian Adolescents Access To And Involvement In In-School Extracurricular Activities In Relation To Substance Use Frequency And Risk Behaviors, Elizabeth A. Jones Dec 2013

American Indian Adolescents Access To And Involvement In In-School Extracurricular Activities In Relation To Substance Use Frequency And Risk Behaviors, Elizabeth A. Jones

Graduate Theses, Dissertations, and Problem Reports (ETD)

This thesis looks at the protective benefits that involvement in adult-led in-school extracurricular activities had on the use of drugs and alcohol by 8th, 10th, and 12th grade American Indian adolescents in Arizona. This population has been chosen because they have a history of oppression, substance abuse, and prejudice. These adolescents represent an extremely at-risk population due to historical trauma and the present-day responses to this trauma. The researcher used data previously collected by the Arizona Youth Survey in 2010 and looked at it through the lens of Hirschi's Social Control Theory and the protective model of resilience. Hirschi's theory …

Go to article

A Versatile Method Of Resolution Enhancement For Tactile Sensor Array Used As Synthetic Skin: Modeling And Implementation, Karen Flores De Jesus Dec 2013

A Versatile Method Of Resolution Enhancement For Tactile Sensor Array Used As Synthetic Skin: Modeling And Implementation, Karen Flores De Jesus

Graduate Theses, Dissertations, and Problem Reports (ETD)

Tactile sensors are one of the major devices that enable robotic systems to interact with the surrounding environment. In particular, modern assistive robotic systems need to carry out many human-like activities. Thus, it is desired to have sensor arrays that can acquire different environmental information just like human skin. In the past two decades, various types of tactile sensor arrays have been developed to acquire different physical properties, such as temperature, force, and geometric shapes. However, though the measurement of a single sensor can be accurate, the planar resolution is limited due to fabrication difficulties. This research aims to propose …

Go to article

Differences In Interpersonal Problems Among Bereaved Vs. Non-Bereaved College Students: The Impact Of Loneliness And Social Inhibition, Adam M. Moller Dec 2013

Differences In Interpersonal Problems Among Bereaved Vs. Non-Bereaved College Students: The Impact Of Loneliness And Social Inhibition, Adam M. Moller

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study explored the differences in loneliness and social inhibition between parentally bereaved and non-bereaved college students. Participants from West Virginia and Montana State universities were recruited through flyers, newspaper advertisements, and Craigslist.com. Those who volunteered were directed to a website to complete an online survey that included basic demographic information, the UCLA Loneliness Scale, and the Socially Inhibited subscale of the Inventory of Interpersonal Problems-64. Bereavement status (bereaved vs. non-bereaved) and gender of participant (male vs. female) were the independent variables in the study. Loneliness and social inhibition were the dependent variables. A MANOVA was conducted to explore the …

Go to article

Characterizing Peripheral Cellular And Humoral Immune Responses To Haemonchus Contortus In Sheep, Jesica Rae Jacobs Dec 2013

Characterizing Peripheral Cellular And Humoral Immune Responses To Haemonchus Contortus In Sheep, Jesica Rae Jacobs

Graduate Theses, Dissertations, and Problem Reports (ETD)

Gastrointestinal nematode parasitism is the most widely reported health concern among sheep producers worldwide. The most concerning of which is Haemonchus contortus; a blood-sucking nematode found in the abomasum of sheep. Worldwide anthelminthic resistance has prompted exploration of alternative methods of parasite control. Many studies have shown St. Croix hair sheep posses an immunologically mediated resistance to H. contortus infection, however no studies have utilized a true parasite naive animal for immune characterization. In this study, development of peripheral immune response was characterized in parasite resistant St. Croix lambs and parasite susceptible Suffolk crossbred Lambs. Lambs were separated into three …

Go to article

Integrated Marketing Communications (Imc) Variables That Influence Perceived Return On Investment (Roi) In Higher Education: Chief Marketing Officers' Perceptions, Adrienne L. King Dec 2013

Integrated Marketing Communications (Imc) Variables That Influence Perceived Return On Investment (Roi) In Higher Education: Chief Marketing Officers' Perceptions, Adrienne L. King

Graduate Theses, Dissertations, and Problem Reports (ETD)

This study examines the relationship of the level of Integrated Marketing Communications (IMC) implementation, level of open systems and change in state appropriations on perceived return on investment (ROI) in U.S. public higher education institutions (HEIs). Designed to provide HEI leaders with data to more accurately determine the best IMC resource allocations, the analysis represents the responses of 40 Chief Marketing Officers (CMOs) at HEIs with high and very high research activity, as defined by the Carnegie Classification, and Council for the Advancement and Support of Education (CASE) memberships.;Building on previous research from the corporate industry indicating four stages of …

Go to article

Mixing Biometric Data For Generating Joint Identities And Preserving Privacy, Asem A. Othman Dec 2013

Mixing Biometric Data For Generating Joint Identities And Preserving Privacy, Asem A. Othman

Graduate Theses, Dissertations, and Problem Reports (ETD)

Biometrics is the science of automatically recognizing individuals by utilizing biological traits such as fingerprints, face, iris and voice. A classical biometric system digitizes the human body and uses this digitized identity for human recognition. In this work, we introduce the concept of mixing biometrics. Mixing biometrics refers to the process of generating a new biometric image by fusing images of different fingers, different faces, or different irises. The resultant mixed image can be used directly in the feature extraction and matching stages of an existing biometric system. In this regard, we design and systematically evaluate novel methods for generating …

Go to article

A Correlational Study To Evaluate The Effectiveness Of Behavior-Based Safety In An Offshore Oil Production Facility, Zinga Martine Branco Dec 2013

A Correlational Study To Evaluate The Effectiveness Of Behavior-Based Safety In An Offshore Oil Production Facility, Zinga Martine Branco

Graduate Theses, Dissertations, and Problem Reports (ETD)

For many countries, oil production constitutes a large part of their economic resources. It is also one of the most hazardous activities with high incident rates. Workplace safety has remained a challenge for these industries which strive to operate injury free. Behavior-Based Safety (BBS) is used as a safety intervention approach to minimize the frequency and severity of workplace incidents and injuries. Many companies assume BBS is effective in reducing injuries and losses. However, only anecdotal evidence is usually presented to support the effectiveness of BBS in decreasing incident rates.;This study explores the relationship between Behavior-Based Safety (BBS) outcomes and …

Go to article

Effectiveness Of Continuous Glucose Monitoring In Children, Adolescents And Young Adults With Poorly Controlled Type 1 Diabetes, Kevin R. Lewis Dec 2013

Effectiveness Of Continuous Glucose Monitoring In Children, Adolescents And Young Adults With Poorly Controlled Type 1 Diabetes, Kevin R. Lewis

Graduate Theses, Dissertations, and Problem Reports (ETD)

Background: Type 1 diabetes is the second most common chronic illness seen in children. Children, adolescents and young adults with type 1 diabetes are provided care in programs with diabetes educators, nurses, nurse practitioners, physicians, dietitians, and many other specialists. Even though children, adolescents and young adults receive care from many providers, their diabetes is often not in good control. In the last 10 years a new device called a continuous glucose monitor has been developed for use with people with diabetes. This new device documents the blood sugar levels in people with diabetes between finger stick blood sugar tests.;Objectives: …

Go to article

Relationships Between Recreational User Perceptions And The Biological Condition Of West Virginia Watersheds, Jennie M. Franks Dec 2013

Relationships Between Recreational User Perceptions And The Biological Condition Of West Virginia Watersheds, Jennie M. Franks

Graduate Theses, Dissertations, and Problem Reports (ETD)

Limitations in bioassessments of stream condition should be recognized and a need exists to broaden our approach to identify and solve knowledge gaps in scientific data. Combining collection methods based upon biological data and social perceptions may provide an effective way to identify gaps and involve local stakeholders in river conservation strategies. Our research objectives were to: 1- describe recreational users and their perceptions of water quality; 2- quantify relationships between recreational user perceptions and biological condition; 3- examine if perceptions vary spatially across watersheds; and 4- determine if recreational users' values and perceptions can be used to complement bioassessment …

Go to article

Folding Solid-Membrane Wing Structure For A Micro Air Vehicle, Joe D. Allen Jr. Dec 2013

Folding Solid-Membrane Wing Structure For A Micro Air Vehicle, Joe D. Allen Jr.

Graduate Theses, Dissertations, and Problem Reports (ETD)

The design of a solid-membrane folding wing for use on a tube launched micro air vehicle (MAV), and experimental wind tunnel results of the wing integrated on an engineering MAV model are presented herein. Due to the sizing and performance requirements of the MAV, the wing must provide sufficient wing area while minimizing its stowed footprint. Many current available methods for folding the wing for such a MAV sacrifice aerodynamic efficiency or are cost prohibitive. The solid-membrane wing design presented blends elements of a solid semi-rigid wing with those of a membrane wing. This provides the aerodynamic efficiency of a …

Go to article

Three Essays On Crime, Hernan Botero Degiovanni Dec 2013

Three Essays On Crime, Hernan Botero Degiovanni

Graduate Theses, Dissertations, and Problem Reports (ETD)

In this dissertation, I use the tools of economics to analyze two forms of crime --- property and violent crime --- in order to investigate three specific incentives that induce them. First, I develop a property crime model with secondary markets for stolen durable goods where agents can be thieves who steal durable goods to consume or exchange them for a profit, and non-thieves who can also demand stolen durable goods in the secondary market. The results indicate that the government must focus their resources to capture thieves on the streets in order to minimize their number in the economy. …

Go to article

Using A Three-Dimensional Model To Understand Age Differences In The Framing Effect, Tara E. Karns Dec 2013

Using A Three-Dimensional Model To Understand Age Differences In The Framing Effect, Tara E. Karns

Graduate Theses, Dissertations, and Problem Reports (ETD)

The present study used a between-subjects design with three instruction conditions to investigate susceptibility to the framing effect among younger, middle-aged, and older adults. Participants were instructed to pay attention to the facts and numbers, to use their gut feelings, or to use their previous experiences to respond to two decision-making scenarios pertaining to treatment for lung cancer and a vaccination for a flu virus. Results revealed that, overall, the framing effect was present in the lung cancer scenario, but not the flu scenario. Instruction condition and age did not affect susceptibility to the framing effect; however, a frame by …

Go to article

Aerodynamic Parameter Identification Of A Venus Lander, Robert A. Sykes Dec 2013

Aerodynamic Parameter Identification Of A Venus Lander, Robert A. Sykes

Graduate Theses, Dissertations, and Problem Reports (ETD)

An analysis was conducted to identify the parameters of an aerodynamic model for a Venus lander based on experimental free-flight data. The experimental free-flight data were collected in the NASA Langley 20-ft Vertical Spin Tunnel with a 25-percent Froude-scaled model. The experimental data were classified based on the wind tunnel run type: runs where the lander model was unperturbed over the course of the run, and runs were the model was perturbed (principally in pitch, yaw, and roll) by the wind tunnel operator. The perturbations allow for data to be obtained at higher wind angles and rotation rates than those …

Go to article

First Prev Next Last