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2015

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The Bacterial Colonization Of Commonly Used Dental Implant Occluding Materials., Brandon G. Katz Dec 2015

The Bacterial Colonization Of Commonly Used Dental Implant Occluding Materials., Brandon G. Katz

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Title: The Bacterial Colonization of Commonly Used Dental Implant Occluding Materials.  Purpose: To determine the bacterial communities inhabiting commonly used materials intended to block/occlude the screw access channel of dental implant crowns/restorations. To aid in the prevention of peri-implantitis, a material that harbors less pathogenic red and orange complex microbes would be potentially beneficial when microleakage is occurring. A superior material for the purpose of the occlusion of screw access channels in implant-supported prostheses is a material that may provide a surface to which bacteria may not colonize. The choice of an occluding material that is less favorable for bacterial …

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An In Vivo Assessment Of The Effects Of Using Different Implant Abutment Occluding Materials On Implant Microleakage And The Peri-Implant Microbiome, Caroline Rubino Dec 2015

An In Vivo Assessment Of The Effects Of Using Different Implant Abutment Occluding Materials On Implant Microleakage And The Peri-Implant Microbiome, Caroline Rubino

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Microleakage may be a factor in the progression of peri-implant pathology. Microleakage in implant dentistry refers to the passage of bacteria, fluids, molecules or ions between the abutment-implant interface to and from the surrounding periodontal tissues. This creates a zone of inflammation and reservoir of bacteria at the implant-abutment interface. Bone loss typically occurs within the first year of abutment connection and then stabilizes. It has not yet been definitively proven that the occurrence of microleakage cannot contribute to future bone loss or impede the treatment of peri-implant disease. Therefore, strategies to reduce or eliminate microleakage are sought out. Recent …

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Living The Past: Bergson, Proust, Deleuze And Nietzsche On Memory And The Self, Danae Mcleod Dec 2015

Living The Past: Bergson, Proust, Deleuze And Nietzsche On Memory And The Self, Danae Mcleod

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Memory is not of the past, it is of the present and it is of the future. This insight, developed by Henri Bergson in Matter and Memory is the subject of this dissertation. Focusing on the figural representations in Matter and Memory, I argue that Bergson presents a dynamic conception of memory that can be read as destabilizing fixed notions of the human subject. I closely examine the implications of Bergson’s positive account of memory, demonstrating that his account is primarily oriented toward showing how memory is useful for action in the present. I continue to develop this dynamic model …

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Numerical Study Of Periodic Adiabatic Rapid Passage Sequences, He Zhang Dec 2015

Numerical Study Of Periodic Adiabatic Rapid Passage Sequences, He Zhang

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Laser cooling refers to the techniques that cool atomic and molecular samples down to near absolute zero through the interaction with laser fields. Atoms absorb a photon and the transferred momentum generates force to lower the atom's velocity. The Doppler shift is associated with the motion of the atom, in which a moving atom always observes a slightly different frequency than the laser at rest. Based on the two-level system theory, this thesis studied the process of multiple sequences of adiabatic rapid passage by simulating the process of the interaction between optical forces and helium atoms. By studying the force …

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Folk Couture: A Fashion Exhibition At The American Folk Art Museum, Alexis Carreno Dec 2015

Folk Couture: A Fashion Exhibition At The American Folk Art Museum, Alexis Carreno

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

This dissertation describes the conceptual framework and the materialization of the exhibition I guest-curated at the American Folk Art Museum, Folk Couture: Fashion and Folk Art. Based on the tradition of artists using fashion to produce artworks, (for instance, Sylvie Fleury’s installation Poison, which commented upon issues of consumerism); couturiers appropriating images from art to create garments (such as Yves Saint Laurent’s Mondrian Dress, in which the designer replicated a painting made by the Russian constructivist artist), and collaborations between fashion designers and artists (for example, designer Marc Jacobs’s and artist Yayoi Kusama’s collaboration for Louis Vuitton), thirteen New York …

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The Power Of Advocacy In Bridging The Ideological Divide: The Campaign For Human Rights And Corporate Responsibility In The Cocoa Industry 2001-2014, Robin Ann Deluca-Acconi Dec 2015

The Power Of Advocacy In Bridging The Ideological Divide: The Campaign For Human Rights And Corporate Responsibility In The Cocoa Industry 2001-2014, Robin Ann Deluca-Acconi

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

A cornerstone of social work’s mission is to advocate for practices that create social justice. This study encourages social workers to broaden their advocacy efforts into the global arena and educate them about Transnational Advocacy Networks (TANs) that are fighting for equitable globalization policies. This longitudinal case study (2001-2014) explores the public debate surrounding human rights abuses in the cocoa industry. Qualitative framing analysis is employed to explore the stakeholders’ discourse surrounding both the causes of and solutions to the Worst Forms of Child Labor (WFCL). This study analyzes press releases from human rights activists, the cocoa industry, and the …

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Lost And Found: Transgender Elders’ Journey Toward Authenticity. A Constructionist Grounded Theory Study | Lost And Found: Transgender Elders’ Journey Toward Authenticity. A Constructionist Grounded Theory Study, Donna Barbara Riley Dec 2015

Lost And Found: Transgender Elders’ Journey Toward Authenticity. A Constructionist Grounded Theory Study | Lost And Found: Transgender Elders’ Journey Toward Authenticity. A Constructionist Grounded Theory Study, Donna Barbara Riley

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

While theoretical models of transgender identity development exist, theoretical models of post-transition social identity development are limited, and theoretical models of transgender individuals transitioning in later life are absent. As such, the purpose of this study is to explore the experience of transgender individuals coming out later in life, often after decades of hiding. Their experiences give voice to the trans community to define self-fulfillment as a transgender person post-transition. Additionally, this study explores the obstacles transgender elders navigate in middle and later life. Using a semi-structured interview guide with 42 transgender elders 55 years and older, respondents constructed chronological …

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Denitrifying Bioreactors: A Solution To Groundwater Nitrate Pollution At The Forge River?, Christine Jean Gurdon Dec 2015

Denitrifying Bioreactors: A Solution To Groundwater Nitrate Pollution At The Forge River?, Christine Jean Gurdon

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Denitrifying bioreactors are an approach to remediate groundwater contaminated with nitrate. Their popularity as a remediation system has increased due to their unnecessary maintenance, low cost, and longevity. While field trials on their performance have been conducted, few have been completed in a marine coastal environment. In this study, a denitrification wall was designed to be installed and monitored along the shore of a coastal environment, namely, the Forge River, New York. Prior to the design phase, a groundwater plume of elevated nitrate-nitrite concentrations needed to be identified. Groundwater nitrate-nitrite concentrations ranged from 0.01-17.68 mg/L along Riviera Drive, a road …

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Denitrifying Bioreactors: A Solution To Groundwater Nitrate Pollution At The Forge River?, Christine Jean Gurdon Dec 2015

Denitrifying Bioreactors: A Solution To Groundwater Nitrate Pollution At The Forge River?, Christine Jean Gurdon

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Denitrifying bioreactors are an approach to remediate groundwater contaminated with nitrate. Their popularity as a remediation system has increased due to their unnecessary maintenance, low cost, and longevity. While field trials on their performance have been conducted, few have been completed in a marine coastal environment. In this study, a denitrification wall was designed to be installed and monitored along the shore of a coastal environment, namely, the Forge River, New York. Prior to the design phase, a groundwater plume of elevated nitrate-nitrite concentrations needed to be identified. Groundwater nitrate-nitrite concentrations ranged from 0.01-17.68 mg/L along Riviera Drive, a road …

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Development Of Carbon Sequestration Options By Studying Carbon Dioxide-Methane Exchange In Hydrates, Kristine Nicole Horvat Dec 2015

Development Of Carbon Sequestration Options By Studying Carbon Dioxide-Methane Exchange In Hydrates, Kristine Nicole Horvat

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Gas hydrates form naturally at high pressures (>4 MPa) and low temperatures (<4 oC) when a set number of water molecules form a cage in which small gas molecules can be entrapped as guests. It is estimated that about 700,000 trillion cubic feet (tcf) of methane (CH4) exist naturally as hydrates in marine and permafrost environments, which is more than any other natural sources combined as CH4 hydrates contain about 14 wt% CH4. However, a vast amount of gas hydrates exist in marine environments, which makes gas extraction an environmental challenge, both for potential gas losses during extraction and the potential impact of CH4 extraction on seafloor stability. From the climate change point of view, a 100 ppm increase in atmospheric carbon dioxide (CO2) levels over the past century is of urgent concern. A potential solution to both of these issues is to simultaneously exchange CH4 with CO2 in natural hydrate reserves by forming more stable CO2 hydrates. This approach would minimize disturbances to the host sediment matrix of the seafloor while sequestering CO2. Understanding hydrate growth over time is imperative to prepare for large scale CH4 extraction coupled with CO2 sequestration. In this study, we performed macroscale experiments in a 200 mL high-pressure Jerguson cell that mimicked the pressure-temperature conditions of the seafloor. A total of 13 runs were performed under varying conditions. These included the formation of CH4 hydrates, followed by a CO2 gas injection and CO2 hydrate formation followed by a CH4 gas injection. Results demonstrated that once gas hydrates formed, they show “memory effect†in subsequent charges, irrespective of the two gases injected. This was borne out by the induction time data for hydrate formation that reduced from 96 hours for CH4 and 24 hours for CO2 to instant hydrate formation in both cases upon injection of a secondary gas. During the study of CH4-CO2 exchange where CH4 hydrates were first formed and CO2 gas was injected into the system, gas chromatographic (GC) analysis of the cell indicated a pure CH4 gas phase, i.e. | all injected CO2 gas entered the hydrate phase and remained trapped in hydrate cages for several hours, though over time some CO2 did enter the gas phase. Alternatively, during the CH4-CO2 exchange study where CO2 hydrates were first formed, the injected CH4 initially entered the hydrate phase, but quickly gaseous CO2 exchanged with CH4 in hydrates to form more stable CO2 hydrates. These results are consistent with the better thermodynamic stability of CO2 hydrates, and this appears to be a promising method to sequester CO2 in natural CH4 hydrate matrices. The macroscale study described above was complemented by a microscale study to visualize hydrate growth. This first-of-its-kind in-situ study utilized the x-ray computed microtomography (CMT) technique to visualize microscale CO2, CH4, and mixed CH4-CO2 hydrate growth phenomenon in salt solutions in the presence or absence of porous media. The data showed that under the experimental conditions used, pure CH4 formed CH4 hydrates as mostly spheres, while pure CO2 hydrates were more dendritic branches. Additionally, varying ratios of mixed CH4-CO2 hydrates were also formed that had needle-like growth. In porous media, CO2 hydrates grew, consistent with known growth models in which the solution was the sediment wetting phase. When glass beads and Ottawa sand were used as a host, the system exhibited pore-filling hydrate growth, while the presence of liquid CO2 and possible CO2 hydrates in Ottawa sand initially were pore-filling that over time transformed into a grain-displacing morphology. The data appears promising to develop a method that would supplant our energy supply by extracting CH4 from naturally occurring hydrates while CO2 is sequestered in the same formations. | 303 pages

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Contention And Control: Violent Protest Policing In Democratic Argentina, Fernanda R. Page Poma Dec 2015

Contention And Control: Violent Protest Policing In Democratic Argentina, Fernanda R. Page Poma

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Beginning in 1990s, Latin American countries have witnessed a dramatic emergence in collective action by unemployed and informal workers. Yet, the rise in mobilizations was coupled with a depiction of protests as violent and dangerous by authorities and the media and was followed by high levels of police violence, control, and imprisonment of protesters. Furthermore, according to human rights groups, police were more violent and repressive at protest by marginal groups. Drawing on an original database of newspaper reports on contentious collective action events from 1997 to 2007 and qualitative data, this research looks at the case of Argentina to …

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Mobilization Lessons From Marcus Garvey And The Universal Negro Improvement Association, Kenneth Andrew Pierce Dec 2015

Mobilization Lessons From Marcus Garvey And The Universal Negro Improvement Association, Kenneth Andrew Pierce

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

This study of the Universal Negro Improvement Association (UNIA) explains the mobilization successes and failures of a major social movement organization and its leader, Marcus Garvey. The UNIA succeeded in mobilizing millions of Blacks; prior to the UNIA, Black Americans had not developed an organization that produced this level of mobilization. By 1920, Garvey was regarded by both critics and supporters as one of the most important leaders of the African diaspora. This research focuses on the roles of the UNIA’s organizational structure and the Black church in explaining why the UNIA was first highly successful and later collapsed. This …

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Meditative Aesthetic, Fiona Naomi Cashell Dec 2015

Meditative Aesthetic, Fiona Naomi Cashell

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Through the use of photography and digital media processes, my art practice explores themes relating to identity, the consciousness of self, home, environment and personal relationships. These themes are explored via an observational approach (external), or, via personal experience (internal); each approach highlighting psychological processes, the vulnerability of self and the commonality of human experience and behavior. In my most recent work, I am using a combination of photography and video, site-specific installation and mixed media applications. Areas of research I am interested in and actively utilize in my work include relational and environmental psychology, cognitive aesthetics, visual communication and …

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Mutilated Bodies And Memories Of Violence: Displacements And Contestations Of Representations Of Violence, In Contemporary Video Art And Photography In Colombia, 1993-1998., Juan Carlos Guerrero Hernandez Dec 2015

Mutilated Bodies And Memories Of Violence: Displacements And Contestations Of Representations Of Violence, In Contemporary Video Art And Photography In Colombia, 1993-1998., Juan Carlos Guerrero Hernandez

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

How do contemporary artworks address and give visibility to the wounded body without reinvigorating trauma, without repeating the spectacular and homogenizing strategies used by the media? How do artworks move beyond denunciation to aesthetically and historically name and rearticulate bodily violence? And fundamentally, how do artworks offer an historical understanding of the political historicity of contemporary violence without uncritically resorting to myth and structural trauma? We intend to answer these questions within the context of art and violence in Colombia in 1990s. In this direction, we examine four artworks produced between 1993 and 1998, by artists Alberto Baraya, Clemencia Echeverri, …

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On Using Risk-Benefit Analysis To Assess And Manage Controversial Research, Daniel Rozell Dec 2015

On Using Risk-Benefit Analysis To Assess And Manage Controversial Research, Daniel Rozell

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Science research in the twenty-first century increasingly results in powerful and rapidly disseminated technologies that raise concerns over technological risk and public safety. A common recommendation for assessing and managing controversial research is to perform a quantitative risk-benefit analysis (RBA) in order to help determine an appropriate course of action. However, these recommendations lack guidelines on how to perform such an assessment. This dissertation lays out a detailed argument why a quantitative RBA should not be used as a basis for making complex policy decisions. Rather, RBA should be regarded as a tool for exploring the impacts of technology on …

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The Merchant Of Venice: Portia As The Embodiment Of Queen Elizabeth I, Weijian Wang Dec 2015

The Merchant Of Venice: Portia As The Embodiment Of Queen Elizabeth I, Weijian Wang

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

With the large amount of research of William Shakespeare, scholars tend to look at Shakespeare as a noble literary figure who wrote the best English poems and plays ever. They, however, may lose a comprehensive understanding of the motivation for some of his best works by not considering his other social roles, such as businessman, shareholder, etc. So when we talk about The Merchant of Venice, there are always elusive questions about the main characters in the play. One question is about how Shakespeare made the audience, especially after the twentieth century, feel pity for Shylock who might have been …

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A Targeted Crispr-Cas9 Screen In Aml Cells, Sam Blake Chiappone Dec 2015

A Targeted Crispr-Cas9 Screen In Aml Cells, Sam Blake Chiappone

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

The genetic underpinnings of a cancer are key to understanding the etiology of the disease and thus to providing a cure, because any robust cure of the disease will need to target a therapeutic window, a gene or a group of genes that are different between the cancerous cells and the normal cells. The research shown in this thesis gives insight into the genetic causes of acute myelogenous leukemia in an attempt to find a therapeutic window for this disease. A genetic screen using CRISPR-Cas9 is designed and conducted in a cell line designated RN 2-5 that was determined to …

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The Roles Of Sox2 And Canonical Wnt Signaling Pathway In Fate Specification Of Tailbud Bipotential Stem Cells, Yu-Jung Tseng Dec 2015

The Roles Of Sox2 And Canonical Wnt Signaling Pathway In Fate Specification Of Tailbud Bipotential Stem Cells, Yu-Jung Tseng

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

During vertebrate development, formation of the head -to-tail body axis is shaped by a group of unspecified cells at the caudal region of the embryo. The undifferentiated tail bud stem cells are capable of adopting mesodermal or neural cell fates as the embryo develops, but the mechanism of this patterning process remains largely unknown. Our previous studies confirm that Wnt signaling is required in tail bud stem cells to repress the neural transcription factor sox2 and induce mesodermal fate. However, it is unclear if sox2 repression at the cell-autonomous level is the critical factor required for Wnt mediated mesoderm induction. …

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Bmp-2 Gene Delivery Using Electrospun Collagen/Plla Scaffold With Surface Adsorbed Transfection Complexes For Bone Formation, Xia Zhao Dec 2015

Bmp-2 Gene Delivery Using Electrospun Collagen/Plla Scaffold With Surface Adsorbed Transfection Complexes For Bone Formation, Xia Zhao

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Bone tissue engineering provides an alternative to bone grafting. Our laboratory previously developed two different types of electrospun scaffolds for bone tissue engineering, including a DNA containing PLGA/PELA scaffold for delivering genes and a collagen/PLLA scaffold for delivering cells. For this dissertation research, we firstly fabricated a DNA containing PLGA/PELA electrospun scaffold using the same method as previously developed, with the intent of delivering osteogenic growth factor genes for bone regeneration. However, the scaffold shrunk severely after being submerged into aqueous environment and failed to achieve high transfection efficiency in vitro. Subsequently, we used the collagen/PLLA scaffold (originally developed for …

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Investigations Of Silver Vanadium Oxide And Silver Vanadium Phosphorous Oxide Solubility: Impact On Battery Performance, David Charles Bock Dec 2015

Investigations Of Silver Vanadium Oxide And Silver Vanadium Phosphorous Oxide Solubility: Impact On Battery Performance, David Charles Bock

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Extended battery lifetime has increased impact with the prospect of long life applications such as electric vehicles and the integration of energy storage into the electric grid. Thus, consideration of parasitic reactions that occur over long periods of time has elevated significance. One such life limiting reaction for several battery systems is the dissolution of the cathode material into the battery electrolyte. This research investigates cathode solubility in the battery system used to power implantable cardioverter defibrillators (ICDs). The benchmark lithium/silver vanadium oxide (Ag2V4O11, SVO) system used in these devices has an unpredictable long term stability limitation attributed to cathode …

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Modified Low-Density Lipoprotein From Mycobacterium Tuberculosis Induces Foamy Macrophage Formation, Guannan Chen Dec 2015

Modified Low-Density Lipoprotein From Mycobacterium Tuberculosis Induces Foamy Macrophage Formation, Guannan Chen

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Tuberculosis (TB) is one of the major causes of mortality in the world, causing approximately 1.5 million deaths every year, among which children take a great part. However, due to the perception that children are rarely infectious or they rarely develop severe disease, children with TB have always been neglected. What is worse, diagnosis of childhood TB is difficult, making it harder to control the disease. Foamy macrophages are a key component in the pathology of TB, and the formation of foamy macrophages foresees the progression of infection to active disease. Low-density lipoprotein (LDL) is one of the major lipoproteins …

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Denitrifying Bioreactors: A Solution To Groundwater Nitrate Pollution At The Forge River?, Christine Jean Gurdon Dec 2015

Denitrifying Bioreactors: A Solution To Groundwater Nitrate Pollution At The Forge River?, Christine Jean Gurdon

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Denitrifying bioreactors are an approach to remediate groundwater contaminated with nitrate. Their popularity as a remediation system has increased due to their unnecessary maintenance, low cost, and longevity. While field trials on their performance have been conducted, few have been completed in a marine coastal environment. In this study, a denitrification wall was designed to be installed and monitored along the shore of a coastal environment, namely, the Forge River, New York. Prior to the design phase, a groundwater plume of elevated nitrate-nitrite concentrations needed to be identified. Groundwater nitrate-nitrite concentrations ranged from 0.01-17.68 mg/L along Riviera Drive, a road …

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The Secret Bank Settlement: Who Was Guilty And Who Was Not?, E Yang Dec 2015

The Secret Bank Settlement: Who Was Guilty And Who Was Not?, E Yang

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Since the subprime mortgage crisis, many banks agreed to pay huge sums to settle the government's accusations that they sold flawed mortgage securities in the 2008 crisis. The Bank of America, JP Morgan, Citi, Wells Fargo, and many other banks have paid a total of more than $130 billion for claims that they intentionally misled investors or were guilty of financial wrongdoing. Is there evidence to support this position and is it fair to assign equal blame to all the big banks? Here, we estimate the expected default rate based on loan characteristics reported by big banks and compare with …

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Co-Design Of Wireless Power Transfer And Data Links For Next Generation Passive Devices, Jinghui Jian Dec 2015

Co-Design Of Wireless Power Transfer And Data Links For Next Generation Passive Devices, Jinghui Jian

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Microsystems that harvest ambient power for their operation have been present in RFID technology and implantable medical devices (IMDs) for couple of decades. With the recent applications under the framework of the Internet of Thing (IoT) and with miniaturization of implantable devices interest in these devices has significantly grown. Two of the critical subjects in the passive devices technology are wireless power transfer (WPT) and data link. The focus of this work is on two distinct applications: design of wireless power transfer for IMDs and backscatter-based tag-to-tag (BBTT) communication system. Our goal in the design of WPT to IMDs is …

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Smart Sensing: Mixed-Signal Vlsi Implementation Of Gradient Flow Localization And Separation, Shuo Li Dec 2015

Smart Sensing: Mixed-Signal Vlsi Implementation Of Gradient Flow Localization And Separation, Shuo Li

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Acoustic source localization and separation are two crucial components in the acoustic signal processing field, which can be utilized in many applications such as smart hearing aids, tracking and surveillance devices. The small form factor of these applications urge the use of miniature sensor arrays. Nonetheless, the performance of traditional localization and separation techniques deteriorate with small-form-factor sensor arrays and they require higher sampling frequency to compensate for the performance loss, which means higher noise floor and more power consumption. Gradient flow is a technique for localization of an acoustic source using miniature microphone arrays by relating temporal and spatial …

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A New Method For Design Of Geometrically Shaped Structures For Prescribed Electromagnetic Field Distribution, Carlos Manuel Pereira Dec 2015

A New Method For Design Of Geometrically Shaped Structures For Prescribed Electromagnetic Field Distribution, Carlos Manuel Pereira

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

The contribution of this research work to the body of existing knowledge is a novel design (inverse) method to compute the distribution of fields when electromagnetic waves interact with surfaces. If given a desired distribution of electromagnetic fields (radiation pattern), the design (inverse) method developed will rapidly allow a designer to determine a unique geometric solution which will provide the desired radiation pattern, which is an inverse problem. The method developed can also be used as an analysis tool to analyze radiating or receiving structures with simple and complex non-linear geometric features. In the extensive literature search provided in this …

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Structurally Integrated, Damage Tolerant Thermal Spray Coatings: Processing Effects On Surface And System Functionalities, Andrew Vackel Dec 2015

Structurally Integrated, Damage Tolerant Thermal Spray Coatings: Processing Effects On Surface And System Functionalities, Andrew Vackel

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Thermal Spray (TS) coatings have seen extensive application as protective surfaces to enhance the service life of substrates prone to damage in their operating environment (wear, corrosion, heat etc.). With the advent of high velocity TS processes, the ability to deposit highly dense (>99%) metallic and cermet coatings has further enhanced the protective ability of these coatings. In addition to surface functionality, the influence of the coating application on the mechanical performance of a coated component is of great concern when such a component will experience either static or cyclic loading during service. Using a process mapping methodology, the …

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Defect Studies And Optimization Of Cvd Grown Boron Phosphide Films On Different Substrates, Xuejing Wang Dec 2015

Defect Studies And Optimization Of Cvd Grown Boron Phosphide Films On Different Substrates, Xuejing Wang

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Boron phosphide (BP), a light III-V indirect semiconductor compound with medium band gap of 2.0 eV, has emerged as a promising material with its applications in solid-state neutron technology and semiconductor devices in extreme conditions. Since bulk BP is unavailable, heteroepitaxial film growth is being attempted on various substrates including silicon, silicon carbide (4H, 6H, 3C polytypes), AlN and sapphire of different orientations to determine the best substrate for growing high quality thin films. By investigating the defects (e.g. twins and grain boundaries, threading dislocations, stacking faults, inclusions) present in the BP epilayer using synchrotron white beam X-ray topography (SWBXT), …

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Topical Treatment Of Actinic Keratosis And Non-Melanoma Skin Cancer With Phospho-Sulindac And Difluoromethylornithine, Yajing Sun Dec 2015

Topical Treatment Of Actinic Keratosis And Non-Melanoma Skin Cancer With Phospho-Sulindac And Difluoromethylornithine, Yajing Sun

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Actinic keratosis (AK), a cutaneous lesion resulting from the proliferation of atypical epidermal keratinocytes, has an incidence of 11%-26% and its prevalence is 58 million in the US alone. AK is a precursor to non-melanoma skin cancer (NMSC). NMSC, consisting of squamous cell and basal cell carcinomas, represents the most frequent human cancer. Current treatment for AK and NMSC is often limited by low efficacy, side effects, high cost, and undesirable cosmetic outcomes. Thus new agents for the treatment of AK are urgently needed. In an effort to develop an efficacious, safe and patient-acceptable approach to both AK and NMSC, …

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Preparation And Characterization Of Stimuli-Responsive Star-Shaped Triblock Copolymers For Gene Delivery, Tianyuan Wu Dec 2015

Preparation And Characterization Of Stimuli-Responsive Star-Shaped Triblock Copolymers For Gene Delivery, Tianyuan Wu

Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions)

Amphiphilic block copolymers with both a hydrophobic domain and a hydrophilic domain can thermodynamically self-assemble into ordered structures such as spherical micelles, worm-like micelles or vesicles in selective solvents which have great potential for biomedical applications such as drug/gene delivery. Stimuli-responsive amphiphilic block copolymers which can change morphology in response to internal or external stimulus have great potential to achieve controlled release of drugs or genes at specific sites. In this dissertation, two types of stimuli-responsive star-shaped triblock copolymers PEO-S(CKn)-PLA and PEO-(PDEAm)-PLA were synthesized and studied. Amphiphilic cationic star-shaped triblock copolymers with poly(ethylene oxide), poly(D,L-lactide), and poly(L-lysine arms) (PEO-S(CKn)-PLA) were …

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