Digital Commons Network^™

An Improved Sin-Hyperbolic Constitutive Model For Creep Deformation And Damage, Mohammad Shafinul Haque

Open Access Theses & Dissertations

Inspection and maintenance of industrial gas turbines (IGTs) cost millions of dollars. Growing demand of obtaining higher IGT efficiency leads to higher temperature and pressure operating conditions. Long exposure of turbine components at elevated temperature and pressure

makes creep damage critically important to consider during planning, designing and operating conditions. Effective and economic maintenance requires accurate creep deformation, damage

evolution and rupture life prediction information. Creep prediction models are used to determine the state of the turbine components and to schedule the inspection, maintenance and replacement time periods. The more accurate the prediction model, the less is the overall cost …

Market Reactions To Businesses' Actions Towards People With Disabilities: Making The Business Case In The International Context, Claudia Araceli Hernández González

Open Access Theses & Dissertations

From the business point of view, people with disabilities still suffer discrimination in employment and lack of accessibility as customers. Opposing, as recipients of philanthropic efforts many individuals and firms donate resources to improve the life of people with disabilities. These actions demonstrate how the majority of the population is still fixed in a medical model of disability by trying to repair the person to conform to the social norm, instead of accepting that many disabilities do not undermine other abilities. However, there is little evidence of how these actions impact the financial performance of the organization. This study attempts …

Beneath The Kiss: Unearthing The Ideological Underpinnings Of Kay Jewelers Advertisements, Chelsea Nedlyn Hill

Open Access Theses & Dissertations

ABSTRACT

Advertising is a frequently used influential and persuasive means of communication, such as Kay Jewelers, a corporation whose advertising methods have been superficially appealing to a female audience. However, this study sought to investigate the ideological underpinnings associated with Kay Jewelers advertisements, employing an ideological criticism to argue through feminist theory that Kay Jewelers utilizes key elements of heteronormative love as a means to persuade and influence men to purchase their jewelry products. Through this underpinning of heteronormative romance, Kay Jewelers emphasizes the notion that an artifact, like a piece of jewelry, is necessary in order to properly express …

High Temperature Helical Tubular Receiver For Concentrating Solar Power System, Nazmul Hossain

Open Access Theses & Dissertations

In the field of conventional cleaner power generation technology, concentrating solar power systems have introduced remarkable opportunity. In a solar power tower, solar energy concentrated by the heliostats at a single point produces very high temperature. Falling solid particles or heat transfer fluid passing through that high temperature region absorbs heat to generate electricity. Increasing the residence time will result in more heat gain and increase efficiency. A novel design of solar receiver for both fluid and solid particle is approached in this paper which can increase residence time resulting in higher temperature gain in one cycle compared to conventional …

Design Of A High Intensity Turbulent Combustion System, Mohammad Arif Hossain

Open Access Theses & Dissertations

In order to design next generation gas turbine combustor and rocket engines, a systematic study of flame structure at high intensity turbulent flow is necessary. The fundamental study of turbulent premixed combustion has been a major research concern for decades. The work is focused on the design and development of a high intensity turbulent combustion system which can be operated at compressible (0.3 < M < 0.5), preheated (T0=500K) and premixed conditions in order to investigate the 'Thickened Flame' regime. An air-methane mixture has been used as the fuel for this study. An optically accessible backward-facing step stabilized combustor has been designed for a maximum operating pressure of 6 bar. A grid has been introduced with different blockage ratios (BR = 54%, 61% & 67%) in order to generate turbulence inside the combustor for the experiment. Optical access is provided via quartz windows on three sides of the combustion chamber. Finite Element Analysis (FEA) is done in order to verify the structural integrity of the combustor at rated conditions. In order to increase the inlet temperature of the air, a heating section was designed to use commercially available in-line heaters. Separate cooling subsystems have been designed for chamber cooling and exhaust cooling. The LabVIEW software interface has been selected as the control mechanism for the experimental setup. A 10 kHz Time Resolved Particle Image Velocimetry (TR-PIV) system and a 3 kHz Planer Laser Induced Fluorescence (PLIF) system have been integrated with the system in order to diagnose the flow field and the flame respectively. The primary understanding of the flow field inside the combustor was achieved through the use of Detached Eddy Simulation (DES) by using commercially available software package ANSYS FLUENT. Preliminary validation is done by 10 kHz TR-PIV technique. Both qualitative and quantitative analysis have been done for CFD and experiment. Major flow parameters such as average velocity, fluctuation of velocity, kinetic energy, and turbulent intensity have been calculated for two distinct Reynolds number (Re = 815 & 3500). PIV results are compared with CFD results which show significant agreement with each other.

Wind Farm Optimization Using Evolutionary Algorithms, Carlos Marco Ituarte-Villarreal

Open Access Theses & Dissertations

In recent years, the wind power industry has focused its efforts on solving the Wind Farm Layout Optimization (WFLO) problem. Wind resource assessment is a pivotal step in optimizing the wind-farm design and siting and, in determining whether a project is economically feasible or not. In the present work, three (3) different optimization methods are proposed for the solution of the WFLO: (i) A modified Viral System Algorithm applied to the optimization of the proper location of the components in a wind-farm to maximize the energy output given a stated wind environment of the site. The optimization problem is formulated …

Effect Of Cooperativeness Of The Parent On Juvenile Probation Officer Decision-Making Using A Randomized Controlled Design, Tamara Kang

Open Access Theses & Dissertations

Juvenile probation officers acknowledge the importance of gaining the parents' cooperation during supervision to ensure the best chance for rehabilitation. However, there is reason to believe that officers may attend to parental cooperativeness to inform decisions on how much to involve the parent in supervision. The importance of the parent is well accepted, but the effect of parental cooperation on officers' decisions concerning the juvenile's fate on supervision has yet to be examined. Aim 1 of this study examined the extent to which an officer's response to a first instance and second instance of noncompliance was affected by the cooperativeness …

Japanese Computational Lexicon: A Computational Dictionary Of Japanese Verb Forms, Mayumi Kobayashi

Open Access Theses & Dissertations

This paper presents two main topics: a linguistic analysis of Japanese morphological lexicon focused on verb conjugation and a computational analysis of Japanese verb conjugation in Prolog programming. Prolog is one of the computer programming languages and is used to solve a problem logically with a number of statements called "clauses," which are defining various relationships of the entities. With respect to the linguistic aspect, this paper discusses Japanese verb formation, its conjugation patterns, twelve basic forms of Japanese verbs, and a Japanese morphophonemic process called “音便 (onbin)” by investigating 304 regular verbs and 2 irregular verbs. Among the several …

Gis Approach In Vehicle Route Optimization For Residential Recyclables Collection, Karel Kus

Open Access Theses & Dissertations

This Thesis focuses on evaluation of utilization of Geographic Information Systems (GIS) for solving the residential recyclables collection routing problems.

Recyclables collection is considered as a part of reverse logistics to which a specific routing problem is connected. Rise of recycling rate in recent years, and always high transportation costs are the main drivers for looking for the new methods how to optimize routing in residential recyclables collection. Geospatial relation of data by Geographic Information Systems (GIS) software can be used to design and analyze the routing strategy. In this Thesis ArcGIS and its Network Analyst extension is used to …

Transition Metal Carbide (Tmc) Novel Materials For Novel Catalytic Applications, Svetlana Lagoykina

Open Access Theses & Dissertations

Transition metal carbides (TMC) constitute a diverse class of materials and traditionally have many technological applications. TMC became a subject of extensive research since 1973, when their platinum -like properties were discovered. They demonstrated high catalytical activity and selectivity in a variety of chemical reaction and have potential for some novel catalytic application.

This research is an effort to design new high effective, selective and stable bimetal or alkali promoted TMC catalyst. After extensive theoretical research a wide range of TMC, including bimetal and alkali promoted carbides, were synthesized by different methods. All solids were characterized by XRD and microscopy. …

Systematics Of The African River Frog Genus Amietia (Anura: Pyxicephalidae) From Eastern Democratic Republic Of The Congo, Thornton Robert Larson

Open Access Theses & Dissertations

The African river frog genus Amietia is found near rivers and other lentic water sources throughout central, eastern and southern Africa. Because the genus includes multiple morphologically conservative species, taxonomic studies of river frogs have been limited. We sampled 49 individuals of Amietia from multiple localities in and near the Albertine Rift (AR) of Burundi, Democratic Republic of the Congo and Uganda. We utilized single-gene (16S) and concatenated (12S, 16S, cytochrome b and RAG1) gene-tree analyses and coalescent species-tree analyses to construct phylogenetic trees. Two divergence dating approaches were used in BEAST, including secondary calibration points with 12S, 16S and …

Thermal Shock Studies On Carbon-Carbon Composites: Experimentation And Analysis, Alma Lucia Leanos

Open Access Theses & Dissertations

The oxidation behavior of C/C composites under thermal shock conditions in air is understood and predicted experimentally and by computational efforts. In Chapter. 1, both compressive properties and oxidation behavior of pristine and thermal shock exposed 2D C/C composite specimens were examined. Pristine test specimens were exposed to thermal shock conditions with temperatures ranging from 400°C to 1000°C in an oxidizing environment, followed by compression tests on pristine and thermal shock exposed specimens to obtain their compressive responses.

Similarly, in Chapter. 2, the influence of thermal shock conditions on both, the extent of carbon materials decomposition and the through-thickness compressive …

The Role Of P62/Imp2 In Breast Cancer Progression, Yang Li

Open Access Theses & Dissertations

Breast cancer is one of the most common types of cancer in women. In most patients with breast cancer, it is not the primary tumor that leads to death, but rather metastatic tumors. Once breast cancer spreads to other organs in the body, the disease becomes almost incurable. It is estimated that about 20% to 50% of patients diagnosed with primary breast cancer will develop metastatic disease. Considering this, it is important to understand the molecular and cellular mechanisms behind metastatic breast cancer and to identify new proteins that regulate the metastatic process. These proteins may be used as targets …

Expression And Functional Analysis Of Lipids And Glycolipids From The Mammal-Dwelling Stages Of Trypanosoma Cruzi, Felipe Gazos Lopes

Open Access Theses & Dissertations

Trypanosoma cruzi is the causative agent of the life-threatening Chagas disease, in which increased platelet aggregation related to myocarditis is observed. Platelet-activating factor (PAF) is a potent intercellular lipid mediator and second messenger that exerts its activity through a PAF-specific receptor (PAFR). Previous data from our group suggested that T. cruzi synthesizes a phospholipid with PAF-like activity. The structure of T. cruzi PAF-like molecule, however, remains elusive. Here, we have purified and structurally characterized the putative T. cruzi PAF-like molecule by electrospray ionization-tandem mass spectrometry (ESI-MS/MS). Our ESI-MS/MS data demonstrated that the T. cruzi PAF-like molecule is actually a lysophosphatidylcholine …

One Size Does Not Fit All: Looking Beyond Homeless Housing-First And Housing-Ready Approaches To Enhanced Models Of The U.S.-Mexico Border And New York City, Jacqueline Loweree

Open Access Theses & Dissertations

This study explored two "enhanced" service and housing models for homeless persons in the U.S.-Mexico border and in New York City. From data collected in both regions, this study examined the relationship between homeless recidivism and the provision of services. The results suggest that services alone have minimal impact in reducing homeless recividism. This study also reviews the relationship between homelessness and poverty. To evaluate this interconnection, a socio-historical analysis was presented reviewing the application of poverty theories from the last two centuries, to policy-driven approaches with aims to treat indigence, poverty, inequality and more contemporary homeless issues. Using the …

Health Assessment For Loved Ones: Development And Validation Of A New Instrument To Measure Well-Being In Military Spouses, Christi Luby

Open Access Theses & Dissertations

Since 2001, over 2.7 million US troops have deployed in support of the ongoing conflicts in the Middle East. Combat stress and deployments affect Service members, and consequently affect their spouses/intimate partners. In addition, these spouses often act as the social support system to other spouses experiencing traumatic events, such as death, injury, or illness of their deployed soldier. These indirect exposures to trauma may make spouses vulnerable; yet little research has focused on how the lived experiences of spouses of deployed and returning US Service members have affected their well-being. The purpose of this three-part study was to develop …

La Otra Frontera: Exiles, Engineering, And State Power In The Chiapan Borderlands, Aaron Margolis

Open Access Theses & Dissertations

This Dissertation examines the political, cultural, and economic history of the Chiapan borderlands from its political incorporation into the post-independence Mexican state in 1821 until the arrival of Guatemalan refugees in the 1980's. This history is explored through the directives, interactions, and policies of officials from Mexico City as the borderlands drifted in and out of the orbit of the priorities of the changing governments of independent Mexico.

A large part of the Dissertation examines how the post-revolutionary Mexican state re-discovered and conceptualized the borderlands as a both a threat to national security and a potential site of energy derived …

Phylogeny And Systematics Of Panaspis And Afroablepharus Skinks (Squamata: Scincidae) In The Savannas Of Sub-Saharan Africa, Maria Fernanda Medina

Open Access Theses & Dissertations

African snake-eyed skinks are relatively small lizards of the genera Panaspis and Afroablepharus. The allocation of these genera was frequently rearranged in the 20th century based on morphology, ecology and biogeography. Members of these genera occur primarily in savanna habitats throughout sub-Saharan Africa and include species that have highly conserved morphology, which poses a challenge for taxonomic studies. We sequenced two mitochondrial (16S and cyt b) and two nuclear genes (PDC and RAG1) from 91 Panaspis and Afroablepharus samples from various localities in eastern, central and southern Africa. Concatenated gene-tree and divergence dating analyses were conducted to infer phylogenies and …

Damas Y Caballeros, Guadalupe Mendez

Open Access Theses & Dissertations

Collected Poetry - Manuscript over socio - political and culturally relevant context.

On The Path To Multi-Electron Redox Chemistry With Bimetallic Systems, Nathalie Metta

Open Access Theses & Dissertations

The following study is presented in two sections, in the first, a novel digold (II) complex with semi-bridging chlorides supported by two bulky formamidinates was synthesized for the purpose of studying late-transition metal multi-electron redox chemistry. Electrochemical analysis shows one non-reversible reduction. Although the electrochemistry of this complex is restricted, the compound shows interesting electronic properties. The crystal structure reveals a geometry distortion of the Au2ï?­-Cl2 core. The coupling of an unoccupied orbital and an occupied orbital through a vibrational mode, causes a distortion in the geometry of the molecule lowering the D2h symmetry to C2h. This is an example …

A Positive Deviance Inquiry On Communicative Acts And Behaviors That Enable Working Mothers To Breastfeed, Jessica Molinar Munoz

Open Access Theses & Dissertations

The benefits of breastfeeding have been well documented for both mother and child. Breastfeeding provides optimal nutrition for an infant and includes decreased risk for numerous diseases and illnesses. However, there is evidence that when mothers return back to work from maternity leave, they often stop breastfeeding. The present research project utilizes the Positive Deviance approach to find working mothers who have successfully breastfed their children exclusively for six months and to determine what enables these mothers to continue to breastfeed past one year of birth while working full time. The purpose is to understand why some working mothers, who …

When Can The Primitive Element Be Written As A Sum Of Two Algebraic Elements Adjoined To The Field Of The Rational Numbers, Mohamad Moussa

Open Access Theses & Dissertations

Given a field F and elements \alpha and \beta not in F, then F(\alpha, \beta) is the smallest field containing \alpha,\beta, and F. A simple extension is a field extension which is generated by the adjunction of a single element. The Primitive Element Theorem says that if F is a field of characteristic 0, and \alpha and \beta are algebraic over F, then there is an element \gamma in F(\alpha ,\beta ) such that

F(\alpha ; \beta ) = F(\gamma). When can we say that \gamma=\alpha+\beta? We will introduce some situations where \gamma=\alpha+\beta is true and some when this is …

Effect Of Si Substrate Orientation On The Quality Of Cdte Selective Growth On Si(111) And Si(211) Substrates Via Closed-Space Sublimation (Css) Witout The Use Of A Mask., Aryzbe Najera

Open Access Theses & Dissertations

The material, fabrication and operation parameters for mercury cadmium telluride (HgCdTe) detectors require high sensitivity, small pixel size, low defect density, long-term thermal-cycling reliability and large area substrates. The focus of this work is on the epitaxial growth of CdTe thin films on Si(111) and Si(211) for the purpose of using the resulting material as a substrate for the subsequent growth of HgCdTe thin films. Currently, there is an interest to improve the quality of epitaxial thin films associated with the fabrication of HgCdTe infrared and X-ray imaging using the close-spaced sublimation (CSS) technique. The CSS technique is proven to …

Re-Specifying The Sacred Values Scale, Adon Lee Neria

Open Access Theses & Dissertations

An object or value becomes sacred when a person feels compelled to protect and admire it. When a person holds a Sacred Value (SV) they are less likely to accept compromises, or "taboo tradeoffs," to that value and will behave less rationally to protect it from perceived slights. Though research on SV has replicated well, there has yet to be a popularized scale measuring it. A previous attempt at developing a multidimensional scale for measuring the degree to which a person holds any value as sacred was made that resulted in a 15-item measure. Though this version demonstrated good predictive …

The Nigerian Economy And The Dutch Disease., Kenechukwu Daryl Nweke

Open Access Theses & Dissertations

Dutch Disease explains the relationship between exploitation of natural resources and the decline in the agricultural and manufacturing sectors. The dependent variable of the model shows the contraction of either the manufacturing or agricultural sector. The theory asserts that increase in revenues from natural resources will de-industrialize a nationâ??s economy by appreciating the real exchange rate, and exports on the booming commodity, which in turn makes the tradable sector less competitive.

The government of Nigeria has neglected the agriculture sector, causing the sector to be less competitive in the trade market. As a result, when economic activities in Nigeria increase …

Keep Your Head Up: Building Life Skills In Youth For Social Reintegration And Success, Olga Lizbeth Ochoa

Open Access Theses & Dissertations

There are multiple factors that contribute to a juvenile's future incarceration when facing difficult environmental circumstances: adjudication (it is like an adult criminal conviction, but generally does not subject the youth to the same direct consequences), community characteristics, the age a young person is discharged, criminal history, and gender. This research is important because it applies social science research in community-based settings to address a social concern, moves beyond theoretical research while contributing to a new orientation of an applied project, and provides a model of university-community partnerships for finding innovative strategies to address issues of social concern for local …

The End Of Celebrity, Alex O'Meara

Open Access Theses & Dissertations

A novel about a movie star who becomes involved in an act of terrorism.

Latina/O High School Students' Standpoint On Environmental Justice In A Border Community: A Phenomenological Study, Cynthia Christina Ontiveros

Open Access Theses & Dissertations

This qualitative research is a transcendental phenomenology seeking to understand Latin@ high school students’ perceptions and standpoints as they participated lessons that addressed border environmental justice issues in an underrepresented, marginalized community. Seven students from Borderland High School, enrolled in a senior level course, Environmental Science, participated in the study which focused on their experiences in an environmental justice air quality thematic unit built around the complex issues surrounding a local refinery, American Smelting and Refining Company (ASARCO). The study analyzed the meaning students made and their standpoints regarding the impact of the factory and its one-hundred year history polluting …

Receiver Function Analysis To Study Crustal Structure Of The Northern Nepal And Tibetan Plateau, Mohan Pant

Open Access Theses & Dissertations

The teleseismic P-waveform receiver function analysis is a commonly used technique in earthquake seismology to study the crustal structure beneath a broadband seismic station. To understand the structure of the Northern Nepal and Tibetan plateau different studies have used the receiver function method to estimate the Moho depth and Vp/Vs ratio. The value suggested was ~ 30 km in the south and the ~ 75 km in the north. Other studies have used teleseismic body wave data to perform the travel time residuals to model the lithosphere structure. In our study, we analyzed data from 261 seismic stations to establish …

Rare Pride Campaigns: Evaluating Participatory Communication In Conservation Efforts Throughout Indonesia, Lauren Elizabeth Perez

Open Access Theses & Dissertations

Communication scholars who study international development and social change have found that if facilitators of social change hope to find positive, lasting solutions to complex social and environmental issues, they must incorporate more participatory approaches. However, even the practitioners with the most noble intentions oftentimes fall short of facilitating truly participatory practices because their strategies are the product of linear processes for evaluating the change context. In this study, I apply Lennie and Tacchi's (2014) approach to evaluating communication for development in a case study of Pride Campaigns implemented by managers throughout Indonesia who partnered with the conservation non-governmental organization …