Recursos de colección

OhioLINK DRC (219.754 recursos)

Ohio campuses are treasure troves of knowledge, but valuable resources are often hidden. The Ohio Digital Resource Commons (DRC) provides a robust, statewide platform for saving, discovering and sharing—free of charge—the instructional, research, historic and creative materials produced by the University System of Ohio and Ohio's private colleges.

University of Akron ETDs

Mostrando recursos 1 - 20 de 820

  1. Defining and Measuring Robustness in Wireless Sensor Communication for Telemedicine

    Bhattarai, Sudha
    Wireless sensor network is useful in a wide range of applications. Motes are used as a media for communication in wireless networks. A robust network is a stable network that can endure various noise factors present in the system. Dropped packets during mote communication are an important parameter to determine the robustness of the system. This can be further explained as properties that are insensitive to small fluctuation from the actual assumption on which they depend. We propose mote technology as a potential source for wireless communication of medical signals in body area networks. In order to determine if the...

  2. Tracking Storms through Time: Event Deposition and Biologic Response in Storr…#8482;s Lake, San Salvador Island, Bahamas

    Sipahioglu, Sara M.
    Because of its position within the southwestern Atlantic Ocean, San Salvador Island, Bahamas has been the site of many hurricane strikes throughout its history. As such, it remains an effective setting in which to examine hurricane intensity in the Late Holocene. The lakes along the island…#8482;s margin provide a depositional archive recording the paleotempestites from these storm events. Storrs Lake is a shallow (66µS) lake located along the eastern side of the island and is separated from the ocean by Holocene dunes. It, like other lakes on San Salvador, is constantly recording climatic changes, vegetation shifts and the history of...

  3. Theoretical Modeling of the Nanostructure Formation in Soft Condensed Matter Using Atomic Force Microscopy

    Paramonov, Pavel B.
    A novel nanolithography technique is developed for nanoscale patterning of polymers: atomic force microscope assisted electrostatic nanolithography (AFMEN). In AFMEN, nanostructures are generated by mass transport of polymeric material within an initially uniform, planar film. The combination of localized softening of attolitres of polymer, a strongly non-uniform electric field to polarize and manipulate the soften dielectric, and single-step process methodology using conventional atomic force microscopy (AFM), establishes a new paradigm for polymer nanolithography. We develop a basic theoretical understanding of the processes associated with AFMEN and present modeling of the relevant phenomena. The analysis of polymer heating indicates that the...

  4. Anionic Synthesis of Well-defined Functionalized and Star-branched Polymers

    Ocampo, Manuela
    Novel methods for the synthesis of chain-end and in-chain functionalized polymers, as well as star polymers, were developed using anionic polymerization techniques. A new mechanism for the reaction of polymeric organolithium compounds with thiiranes has been found. The reaction of poly(styryl)lithium and poly(butadienyl)lithium with propylene sulfide and ethylene sulfide was investigated in hydrocarbon solution for the preparation of thiol-functional polymers. It was found by MALDI-TOF mass spectral analysis of the reaction products that the reaction proceeded by attack of the anion on the methylene carbon atom of the thiirane ring followed by ring opening to form the thiol-functionalized polymer. The...

  5. Simulations of Shearing Rheology of Thermotropic Liquid Crystalline Polymers

    Chen, Hongyan
    The simulations present a first attempt to describe the rheological properties of the liquid crystalline polymers (LCPs), using recently developed thermodynamic theory of weakly viscoelastic nematodynamics. In this theory the complicated rheological properties of nematic LCPs are modeled by a set of quasi-linear anisotropic viscoelastic constitutive equations (CE)with anisotropy described by director, whose viscoelastic evolution is coupled with the evolution of director. Although this theory has been developed for relatively small viscoelastic effects, it is still possible to compare the simulations with experimental data. A new mathematical tool, algebra of nematic operators, is helpful in operations with this multi-parametric theory....

  6. The Life and Career of Fashion Designer, George Stavropoulos

    Bland, Kasey Dawn
    George Stavropoulos, a New York fashion designer, built a multi-million dollar business on his signature, floating chiffon dresses. His self-titled label produced eveningwear and daytime styles for the wholesale, ready-to-wear market, from 1961 to1991. While he was known for his use of chiffon, Stavropoulos also created notable designs in lace, lamé, suede, and taffeta. Stavropoulos, born in Greece, believed in classic design and found inspiration in the simplicity of ancient Greek sculpture. Renowned for his innovative draping techniques, Stavropoulos created every piece in his collection and produced the entire line in his 57th Street atelier. For each spring and fall...

  7. Study of Amine Impregnated on Silica Support for CO2 Capture

    Tanthana, Jak
    The rapid increase in CO2 emission in recent years has become a major concern because of its potential link to global climate change. Among CO2 contributors, coal-fire power plant accounts for more than 30% of total CO2 emission worldwideThree major approaches for capture of CO2 are proposed: postcombustion, oxyfuel and precombustion. Each has distinct advantages and disadvantages. Postcombustion utilizing amine based absorption process by far is the most fundamentally established and can be retrofitted to existing coal-fire power plants around the globe. Limited by high heat of reaction, the amine absorption process requires a significant amount of energy during solvent regeneration. Large physical facility foot print and corrosive...

  8. Moderation of the Relation Between Distress and Help-Seeking Intentions: An Application of Hope Theory

    Uffelman, Rachel Anne
    Theories of psychological help-seeking consistently suggest that personal traits influence the process of help-seeking. Research on help-seeking intentions indicates that positive attitude toward help-seeking and having sought help in the past are also related to greater intentions to seek help in the future. The role of distress in predicting help-seeking intentions is somewhat less clear, with research inconsistently supporting the relation between heightened distress and intentions to seek psychological help. The present research attempted to clarify the relation between distress and help-seeking intentions by introducing hope as defined by Hope Theory (Snyder et al., 1991) as a personal trait that may...

  9. Design, Control, and Implementation of a Three Link Articulated Robot Arm

    Dentler, Donald Richard, II
    Robots have become commonplace in the manufacturing environment, allowing tasks ranging from the most repetitive to the most complex to be automated. As technology advances, robotics evolves to be both more precise and practical. The purpose of this research is to study the behavior of a robotic system through the use of a three link articulated robotic arm. An in depth description of the various actuators, controllers, and drivers is included. The arm will be designed following the physical principals governing static and dynamic requirements of motion. The design process includes both examining structural requirements and control implementation. Component selection must...

  10. Hydrogeology of a Modified Wetland, Liberty Park, Twinsburg, Ohio

    Dzirasah, Bernard
    The hydrogeology of a degraded, invasive species dominated, wetland in Liberty Park, Twinsburg, Ohio, located within the glaciated Allegheny Plateau region was investigated. This wetland, along with Pond Brook, the major stream draining the park, has been selected for a comprehensive restoration. Recent hydrologic modifications such as ditching, dredging, and channelization of Pond Brook adversely affected the hydrology of the natural riparian wetlands. Fifteen shallow monitoring wells were installed in the 39-acre wetland cell. Continuous water-level data loggers with an interface for data-downloading to a host computer were installed in Pond Brook and five monitoring wells in the degraded wetland. The...

  11. Investigating the Existence of Trauma-Specific Growth: A Comparison of Two Populations

    Warbel, Amanda L.
    Posttraumatic growth (PTG) is defined as, �€�positive psychological change experienced as a result of the struggle with highly challenging life circumstances�€� (Tedeschi & Calhoun, 2004, p. 1). These positive psychological changes are thought to occur as the result of the rebuilding and restructuring of an individual�€™s core assumptions about the world and self that occur when a person experiences a traumatic event. In the current study, two specific trauma types, sexual assault and breast cancer diagnosis, were examined to see how these differing types of trauma may influence which core cognitive schemas are challenged as the result of experiencing the...

  12. Examining the Mechanisisms by which Situational and Individual Difference Variables Relate to Workplace Deviance: The Mediating Role of Goal Self-Concordance

    Chandler, Megan M.
    The purpose of this study was to examine whether variables derived from the self-concordance model mediate the influence of individual and situational variables on workplace deviance. Results revealed that none of the situational and individual level antecedents predicted goal-self-concordance, when operationalized as a difference score. However, when the self-concordance components (i.e., intrinsic and extrinsic motivation) were examined separately, the personality trait of other referenced goals and personal mastery predicted extrinsic motivation and intrinsic motivation, respectively. Additionally, self-concordance (and its components) did not predict goal attainment measured four weeks later, and goal attainment did not predict need satisfaction. Extrinsic motivation was...

  13. Cement Augmentation Enhanced Pullout Strength Of Fatigue Loaded Bone Screws

    Raikar, Sajal Vijay
    Cement augmentation of bone screws have shown to improve implant anchorage in fixation of fractured bones. With internal fracture fixation, early mobilization is necessary to avoid possible complications due to bone mineral loss, thromboembolism and abnormal cardiopulmonary activities. The effect of fatigue loading on cement augmentation strength has not been previously studied. The objective of this study was to determine the effect of short-term repetitive loading on the pullout strength of uncemented and cement augmented bone screws in osteoporotic, osteopenic and normal bones. Standard pullout tests were conducted in eight paired specimens to evaluate fixation strengths of uncemented and cement...

  14. E-Patients and Caregivers Coping with Cystic Fibrosis: The Relationship Between Relational Satisfaction and Attitudes Toward Groups, Loneliness, and Social Support Online

    Barber, Jennifer S.
    This study contributes to the growing focus on online support groups and computer mediated communication by examining a unique population of individuals inflicted with, or caring for someone inflicted with, the genetic disorder of Cystic Fibrosis. Although significant advances have been made in the treatment of this disease over the last 30 years, recent findings have found that face-to-face interactions between individuals with the disease should be avoided. With this understanding, the current study focuses on this population in an online social support group environment. The theoretical framework was drawn from Schutzs' (1966) Interpersonal Needs Theory, as applied to the...

  15. "But Are We Really Friends?": Online Social Networking and Community in Undergraduate Students

    Hoffman, Phil R.
    This study investigates the use of online social networking web sites by undergraduate students as it relates to their sense of community on college campuses. Using a case study method, an audit trail was created to study how undergraduates perceived online social networking web sites like Facebook.com as it relates to their sense of shared values and norms of behavior, extended relationships of caring, and sense of obligation to the greater good of that community. Six undergraduate students were interviewed on three separate occasions to develop deep understanding of how the participants viewed themselves, their campus community, and the relationship...

  16. Nonlinear Flow Behavior of Entangled DNA Fluids

    Boukany, Pouyan E.
    Understanding the nonlinear flow behavior of entangled fluids including shear thinning (related to stress plateau) or transient stress overshoot upon startup shear remains a fundamental challenge in polymer rheology. For more than five decades, a conventional rheometric measurement was carried out to investigate the nature of these nonlinear viscoelastic properties in entangled fluids by treating them as liquids that could deform homogenously. Recent particle-tracking-velocimetric (PTV) measurements based on 1,4 polybutadiene (PBD) solutions has found that shear inhomogeneity occurs after stress overshoot when sheared on time scale faster than terminal relaxation time (γ̇appτ > 1.0). Because of experimental difficulties such...

  17. A Three Sector, Integrated Approach To Economic Growth Modeling: Production, Human Capital, and Health Education

    Tucker, Joseph James
    The intent of this thesis is to model the interactions and interpret the ramifications of time invested in health education on the economy of a developing country. By constructing a three-sector economy, consisting of production, production education, and health education and by employing a Hamiltonian maximization technique, the aim of this thesis is to determine daily, non-leisure time allotments that encourage economic growth as well as delineate the time allotments that permit economic stagnation. This thesis presents an integrated approach to economic growth modeling by utilizing non-linear output modeling, incorporating logistic equation based technological, life-span, and productivity growth equations, and...

  18. Pet Bereavement and Families: A Qualitative View

    Petrich, Deirdre K.
    The purpose of this study was to explore the loss of a companion animal/pet family member within the context of a family. In order to better understand the nature of bereavement upon the loss of a pet family member it was essential to first grasp the nature of attachment to the companion animal. Five families were selected to participate in this qualitative research study which examined the nature of attachment to the family member pet and the loss that was experienced when that pet family member passed away. These families were all unique in that they had all lost their...

  19. Simulations of the Tip of a Single-Walled Carbon Nanotube Interacting with a Graphite Substrate Through van der Waals Forces

    Mykrantz, Andrew Stuart
    Potential applications for carbon nanotubes (CNTs) include their use in atomic force microscopy and in adhesives. However, further analysis is needed. We present the modeling and analysis of the tip of a single-walled CNT interacting with a graphite substrate. The tip of the CNT is modeled as a chain of rigid links connected by torsional springs. The tip interacts with the substrate through van der Waals forces. We study a static version of the problem in which the substrate is fixed at various distances below the top link. Steady-state solutions are found using minimization techniques. Much work was done on...

  20. Modeling, Simulations, and Parametric Studies of the Dip Coating Process with the Effect of Solvent Evaporation Rate and Bulk Reaction Rate

    Jittavanich, Kotchanun
    In this paper we study the dip coating problem. We present a thin film model based on the lubrication approximation that includes an evaporation effect of the solvent and the bulk reaction effect of erbium oxide to determine the thickness of the coatings. We solve the problem numerically with the modified two-step Lax-Wendroff scheme [1]. While the two main mechanisms influencing the final film thickness are the solvent evaporation rate and the erbium oxide reaction, we also study how the dynamic viscosity, the angle of the inclined substrate, the characteristic depth of the solution thickness, the initial profile of the...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.