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2018

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Topological And Feature Based Identification Of Hole Boundaries In Point Cloud Data And Differentiation Between Surface And Physical Holes, Aaqif Muhtasim Dec 2018

Topological And Feature Based Identification Of Hole Boundaries In Point Cloud Data And Differentiation Between Surface And Physical Holes, Aaqif Muhtasim

Computer Science and Engineering Theses - Archive

With the advent of autonomous agents becoming prominent in everyday lives, the importance of processing the surroundings into understandable features becomes more and more important. 3D point clouds play a major role in the perception of such agents and thus having the ability to correctly decipher features from point clouds is crucial to the planning of actions that the agent would need to undertake. This thesis analyzes holes found in point clouds. Based on two approaches that center around topological data analysis and local point set features respectively. It studies how each of the methods works and how a combination …

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Generating An Adaptive Path Using Rrt Sampling And Potential Functions With Directional Nearest Neighbors, Sandeep Chahal Dec 2018

Generating An Adaptive Path Using Rrt Sampling And Potential Functions With Directional Nearest Neighbors, Sandeep Chahal

Computer Science and Engineering Theses - Archive

Planning algorithms have attained omnipresent successes in several fields including robotics, animation, manufacturing, drug design, computational biology and aerospace applications. Path Planning is an essential component for autonomous robots. The problem involves searching the configuration space and constructing a desired collision-free path that connects two states (the start and the goal) for a robot to gradually navigate from one state to another. In global path planners, the complete path is computed prior to the robot set off. Sampling based planning like Rapidly Expanding Random Trees (RRT) and Probabilistic Road Maps (PRM) used for single or multi-query planning has gained popularity …

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Text Mining On Twitter Data To Evaluate Sentiment, Srijanee Niyogi Dec 2018

Text Mining On Twitter Data To Evaluate Sentiment, Srijanee Niyogi

Computer Science and Engineering Theses - Archive

Social media platforms have been a major part of our daily lives. But with the freedom of expression there is no way one can check whether the posts/tweets/expressions are classified on which polarity. Since Twitter is one of the biggest social platforms for microblogging, hence the experiment was done on this platform. There are several topics that are popular over the internet like sports, politics, finance, technology are chosen as the source of the experiment. These tweets were collected over a span of time for more than 2 months via a cron job. Every tweet can be divided into three …

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Nonupdating Methods For The Characterization Of Nonlinear Stress-Strain And Delamination Fracture Properties Of Fiber Reinforced Composites, Bastiaan Corstiaan Van Der Vossen Dec 2018

Nonupdating Methods For The Characterization Of Nonlinear Stress-Strain And Delamination Fracture Properties Of Fiber Reinforced Composites, Bastiaan Corstiaan Van Der Vossen

Mechanical and Aerospace Engineering Dissertations - Archive

Efforts to develop strength and life prediction analysis tools for aircraft composite structures have shown a great need to understand the complexity and interaction of failure modes. Many failure models are highly sensitive to transverse nonlinear shear stress-strain and delamination fracture properties, which are notoriously hard to measure. Without proper input parameters, life predictions analyses will not be successful. The objective of this work was to accurately characterize these mechanical properties of carbon fiber reinforced polymer composites through advanced experimental methods. Full-field noncontact deformation measurements using Digital Image Correlation are used to quantify all surface strains components, enabling the design …

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Evaporative Hotspot Cooling Of Microprocessors Using Electrowetting On Dielectric (Ewod), Arvind Venkatesan Dec 2018

Evaporative Hotspot Cooling Of Microprocessors Using Electrowetting On Dielectric (Ewod), Arvind Venkatesan

Mechanical and Aerospace Engineering Dissertations - Archive

The increased use of smart devices and great strides in fabrication technologies have resulted in densely packed electronics. Combined with 3D packaging, high heat uxes have become the norm. The need for advanced thermal management solutions has risen. Most devices based on their load pro le and architecture are susceptible to non-uniformities in heat uxes. These non-uniformities with very high heat uxes are known as hotspots. Mitigation of hotspots is very important for the normal functioning and long term reliability of microprocessors. Multiple attempts have been made at developing microscale thermal solutions. Most prominent among them are microchannels and heat …

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Design Principles For Large Foil Bearings Based On Scaling Laws: Analyses And Experiment, Srikanth Honavara Prasad Dec 2018

Design Principles For Large Foil Bearings Based On Scaling Laws: Analyses And Experiment, Srikanth Honavara Prasad

Mechanical and Aerospace Engineering Dissertations - Archive

Gas foil bearings are used for supporting high speed turbomachinery systems. They are characterized by complex physical and thermal interactions between the lubricating fluid and the structural elements. Mathematically, the behavior of such systems is governed by nonlinear partial differential equations and pose substantial computational challenges. However, their potential applications in aerospace systems and power generation systems have renewed research and development efforts aimed at simplifying their design and analyses methods. Commercialization of gas foil bearings in Mega Watt scale applications necessitate the development of simple tools for estimating bearing design parameters such as load capacity, radial clearance, and support …

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Surface Roughness Formation During Tensile Plastic Deformation Of Nickel Polycrystals, Kranthi Balusu Dec 2018

Surface Roughness Formation During Tensile Plastic Deformation Of Nickel Polycrystals, Kranthi Balusu

Mechanical and Aerospace Engineering Dissertations - Archive

Understanding the formation of surface roughness could help better diagnose a metal component’s health and could potentially help in making better microstructure design decisions. Both of these, in turn, contribute to the design of efficient structural components. In this work, the research objective is to understand the relationship between the surface microstructure (i.e., grain orientations) and the surface-height changes in nickel polycrystals undergoing small amounts of tensile plastic deformation. The secondary objective is to determine the relationship between surface height and strain localization. Primarily simulations were used, along with experimental surface roughness observations, to validate the simulation results. Discrete dislocation …

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Performance Modeling And Experimental Investigations Of Rotating Detonation Engines, Andrew Ryan Mizener Dec 2018

Performance Modeling And Experimental Investigations Of Rotating Detonation Engines, Andrew Ryan Mizener

Mechanical and Aerospace Engineering Dissertations - Archive

The rotating detonation engine (RDE) is a promising propulsion concept that has the potential to offer increased thermodynamic performance in a compact package with no moving parts. A series of analytical and experimental investigations was carried out on RDEs with the joint goal of investigating swirl, torque, and a range of other design parameters of interest. The model and experimental facility were then applied to related problems with the goal of advancing the understanding of RDE applications. A flexible, low-order, semi-empirical model for a rotating detonation engine was presented. The model was formulated to be able to run broad parametric …

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Direct Numerical Simulation Of Homogeneous Isotropic Turbulence - A Methodology And Applications, Sarah Moussa Hussein Dec 2018

Direct Numerical Simulation Of Homogeneous Isotropic Turbulence - A Methodology And Applications, Sarah Moussa Hussein

Mechanical and Aerospace Engineering Dissertations - Archive

Turbulence has been a topic of scientific research for years. Characterized by unorganized chaotic motion and irregular fluctuations, it persists as one of the most challenging topics in fluid mechanics despite volumes of documented research and crucial findings. This begs the question: What is turbulence and why is it so challenging? Turbulence research studies cover a wide spectrum of branches from fundamental flow propagation to different turbulence interactions. This research project investigates the simplest class of turbulent flow studies, homogeneous isotropic turbulence. In a quest to advance the fundamental understanding of turbulence physics, a direct numerical simulation tool is developed. …

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Observation Of The Interaction Between A Transonic Shock Wave And A Wingtip Vortex||, Troy T. Bushmire Dec 2018

Observation Of The Interaction Between A Transonic Shock Wave And A Wingtip Vortex||, Troy T. Bushmire

Mechanical and Aerospace Engineering Theses - Archive

The present study observes the interaction between two fundamental phenomena in fluid mechanics: the transonic shock wave and the wingtip vortex. While these are two areas of fluid mechanics in which extensive experimental and numerical research has been conducted, there is little information on the interaction between the two. The present study numerically simulates a wing with a NACA-0012 section at Mach 0.758 and observes the interaction between the transonic shock wave and wingtip vortex for various angles of attack. The focus of the study is on the surface flow topology and the flow exterior to the boundary layer. Results …

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Reachable Set Computation And Analysis For Perturbed Linear Systems, Prabhjeet Singh Arora Dec 2018

Reachable Set Computation And Analysis For Perturbed Linear Systems, Prabhjeet Singh Arora

Mechanical and Aerospace Engineering Theses - Archive

Determination of the set of all possible states, which a system can attain, plays an important role in safety for critical application. Prior knowledge of this set for the complete run-time provides critical information about how a system may evolve, providing accurate information of all the states, which could violate constraints. The knowledge of these states, helps in estimating control input, which can control the system, such that, these states are eliminated from the reachable set. Computation of reachable set of a dynamic system for a set of initial conditions can be easily performed, provided the analytical solution of the …

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An Analytical Design Of Experiments Method For Fatigue Constrained Design Optimization Of A 3d Printed Structure, Ashish Pokharel Dec 2018

An Analytical Design Of Experiments Method For Fatigue Constrained Design Optimization Of A 3d Printed Structure, Ashish Pokharel

Mechanical and Aerospace Engineering Theses - Archive

A design of experiments approach has been used to analytically determine a low cycle fatigue (LCF) constraint for use in design optimization of 3D printed structures. In context of metal additive manufacturing, the process of melting, solidification and consolidation of metal powder introduces very high temperature gradient field within the build which in turn results in high compressive stresses at the core and tensile stresses at the outer surface of the part after it has cooled down to room temperature post build. An approach of finite element modeling in ANSYS Additive has been used to develop a residual stress profile …

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Sensor Tasking For Satellite Tracking Utilizing Observability Measures, Mitchel T. Mcdonald Dec 2018

Sensor Tasking For Satellite Tracking Utilizing Observability Measures, Mitchel T. Mcdonald

Mechanical and Aerospace Engineering Theses - Archive

In this thesis, novel observability-measure based sensor tasking methods are studied for satellite tracking applications. The tasking is performed by first computing the Hellinger Distance between ground/space based sensors and space objects, and then the measure is utilized for selecting the sensors that maximize observability. Several other measures such as the Fisher Information Gain, Largest Lyapunov Exponent, and Shannon Information Gain have also been utilized and the performance of these measures are computed against each other. The object's state estimates are obtained using nonlinear estimation techniques. The Extended Kalman Filter, Unscented Kalman Filter, and Bootstrap Particle Filter are compared within …

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Design And Development Of Flexible Mems-Based Ph Sensor For Agricultural And Biomedical Applications, Shardul Sonu Pawar Dec 2018

Design And Development Of Flexible Mems-Based Ph Sensor For Agricultural And Biomedical Applications, Shardul Sonu Pawar

Mechanical and Aerospace Engineering Theses - Archive

The purpose of this study is to demonstrate a novel method of using a flexible MEMS-based pH sensor for agricultural and biomedical applications. The first part of the thesis involves demonstration of the capability of our pH sensor for monitoring pH level change in the food product. The pH sensor we have developed consists of Iridium Oxide (IrOx) and Silver Chloride (AgCl) sensing electrodes. The sensor is designed to monitor and sustain long-term continuous usage, which makes it suitable for a wide variety of agricultural based applications. The electrochemical potential generated between IrOx and AgCl electrode is monitored and further …

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Enhancing Tensile Strength Of Fdm Parts Using Thermal Annealing And Uniaxial Pressure, Rhugdhrivya Rane Dec 2018

Enhancing Tensile Strength Of Fdm Parts Using Thermal Annealing And Uniaxial Pressure, Rhugdhrivya Rane

Mechanical and Aerospace Engineering Theses - Archive

Additive manufacturing has been a revolutionary and disruptive technological development in the field of design and manufacturing with Fused deposition modelling (FDM) being at the forefront of this technology. But it is seen that parts printed using FDM suffer from an inherent deficiency of weak tensile strength in the out of plane direction (z-direction) thus limiting their application. This issue of weak z-direction strength is due to the weak Inter-bead bond strength of adjacent polymer interfaces. The purpose of this work is to increase this Inter-Bead bond strength thus increasing the overall tensile strength of the part. In this work, …

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Inducing Vibro-Tactile Sensation At Mesoscale, Sudip Hazra Dec 2018

Inducing Vibro-Tactile Sensation At Mesoscale, Sudip Hazra

Mechanical and Aerospace Engineering Theses - Archive

Haptics, the feeling of touch, has primarily been used to provide a person a general sensation such as vibration using a joystick or cellphone. But haptics has gradually developed to a stage where it is investigated for virtual and augmented reality environments. Vibro-tactile based feedback is a modality employed to provide a more realistic and localized sensation. This research focuses primarily on providing vibro-tactile feedback at the mesoscale level on the fingertips. A research platform for mesoscale vibro-tactile feedback has been investigated and developed. The software is based on LabVIEW and could generate a number of different and distinct waveform …

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Thermodynamic And Phase-Field Analysis Of Domain Structures And Switching Kinetics Of Bismuth Ferrite Thin Films, Ryan T. Hart Dec 2018

Thermodynamic And Phase-Field Analysis Of Domain Structures And Switching Kinetics Of Bismuth Ferrite Thin Films, Ryan T. Hart

Material Science and Engineering Theses - Archive

In this study, thermodynamic analysis and phase field simulation are utilized to study the polarization, phase transitions, and phase coexistence in BFO thin films. The effect of temperature, substrate strain, and electrical bias on the phase stability and the phase transformation pathways were studied. Existing thermodynamic analysis methods are supplemented by a phase destrain model, which determines free energy minima as a function of biaxial strain and the fractions of BFO’s ferroelectric phases in a thin film. The results of this methodology are compared with phase field modeling. The phase de-strain model shows reasonable accuracy in determining boundaries at which …

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The Economic Impact Of Refugees On A Host Country, Zaid Ghaleb-Sharari-Al-Bakhit Alfayez Dec 2018

The Economic Impact Of Refugees On A Host Country, Zaid Ghaleb-Sharari-Al-Bakhit Alfayez

Public Affairs Dissertations - Archive

Refugee numbers are increasing around the world due to political instability. Host countries are encountering several issues such as socioeconomic challenges as a result of refugees. Therefore, it is essential to investigate the effects of the economic impact of refugees. The Middle East region has taken in a high number of these refugees, especially Jordan. This empirical research studies the impact for countries receiving refugees to help policy makers effectively regulate and deal with this challenge. This study analyzes the impact of refugees on the economy using Jordan as a case study. However, this research can be applied to other …

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Parent Involvement Activities That Lead To Increased Parent Participation: A Case Study, Sandra Patricia Fernandez Dec 2018

Parent Involvement Activities That Lead To Increased Parent Participation: A Case Study, Sandra Patricia Fernandez

Public Affairs Dissertations - Archive

There is sufficient evidence to suggest that parent involvement increases student success. Connecting the home to the school can offer a bridge that will lead to academic success for students. Parent involvement can lead to increased school success in terms of test scores. Research shows that parents are involved in many ways at the schools but when asked, they have varying definitions of what parent involvement means to them. The major hypothesis of this study is that when parents are offered more ways to participate at various times of the day, they are more inclined to be more involved in …

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A City In Crisis: Communication Network, Ethics, And Power In The City Of Dallas, Sana Salma Syed Dec 2018

A City In Crisis: Communication Network, Ethics, And Power In The City Of Dallas, Sana Salma Syed

Public Affairs Dissertations - Archive

The conceptual framework for this research builds on Manuel Castells’s work to find the specific network configuration of actors, interests, and values that engage in their power-making strategies to operationalize a communication network and understand the roles and powers of programmers and switchers at a local level. The study explores the role and purpose of communication networks within cities from the perspective of administrators and elected officials and their responsibility to provide communication as a public good. The research design is an organizational autoethnography of the city of Dallas that incorporates various perspectives from those who were a part of …

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The Effects Of Travel Time Delay On Vehicle Miles Traveled And Travel Mode Choice Behavior: An Empirical Analysis Of The Seattle Metropolitan Area, Reza Sardari Dec 2018

The Effects Of Travel Time Delay On Vehicle Miles Traveled And Travel Mode Choice Behavior: An Empirical Analysis Of The Seattle Metropolitan Area, Reza Sardari

Public Affairs Dissertations - Archive

Traffic congestion is a crucial factor for understanding travel behavior. The scientific evidence has shown that traffic congestion affects air quality, public health, and economic development, but empirical studies about the effects of travel time delays on travel behavior are limited. This research aims to address this gap by developing a time-related mobility measure, or “delay score,” and analyzing its impact on VMT and commuters’ mode choices within a comprehensive framework that incorporates the built environment, demographics, and residential preference/self-selection factors. In this framework, VMT per household and travel mode choice were examined using SEM and GSEM techniques, respectively. This …

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Factors Affecting Transit Ridership And The Impact Of Intelligent Transit Information Systems (Itis) - Case Study Of Dallas Area Rapid Transit (Dart), Ahmed Ismail Daqrouq Dec 2018

Factors Affecting Transit Ridership And The Impact Of Intelligent Transit Information Systems (Itis) - Case Study Of Dallas Area Rapid Transit (Dart), Ahmed Ismail Daqrouq

Public Affairs Dissertations - Archive

Transit ridership is at the heart of transportation policy making and the success of any transit system. Urban planners have been focusing on the need to reduce car dependence and promote more sustainable transportation alternatives. Automobile dependence is a concern for many reasons including congestion in urban areas, pollution, and environmental damages. Switching to more sustainable and environmentally friendly transportation modes such as public transit is likely to be an effective solution to most of these problems. As an alternative to the private car, public transit is an effective means to move large numbers of people within cities, and transit …

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Factors Affecting Transit Ridership And The Impact Of Intelligent Transit Information Systems (Itis) - Case Study Of Dallas Area Rapid Transit (Dart), Ahmed Ismail Daqrouq Dec 2018

Factors Affecting Transit Ridership And The Impact Of Intelligent Transit Information Systems (Itis) - Case Study Of Dallas Area Rapid Transit (Dart), Ahmed Ismail Daqrouq

Planning Dissertations - Archive

Transit ridership is at the heart of transportation policy making and the success of any transit system. Urban planners have been focusing on the need to reduce car dependence and promote more sustainable transportation alternatives. Automobile dependence is a concern for many reasons including congestion in urban areas, pollution, and environmental damages. Switching to more sustainable and environmentally friendly transportation modes such as public transit is likely to be an effective solution to most of these problems. As an alternative to the private car, public transit is an effective means to move large numbers of people within cities, and transit …

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Rational Design And Synthesis Of Biodegradable Polyurethane Based Biomaterials, Cancan Xu Dec 2018

Rational Design And Synthesis Of Biodegradable Polyurethane Based Biomaterials, Cancan Xu

Bioengineering Dissertations - Archive

Biodegradable polyurethanes have been applied in biomedical field since 1960s. In recent years, biodegradable polyurethanes have been widely investigated for tissue repair and regeneration because of their good mechanical properties, elasticity, biodegradability, biocompatibility and processability. Compared with some commonly used biodegradable polymers, such as poly(glycolide) (PGA), poly(lactide) (PLA), poly(ε-caprolactone) (PCL) and polyhydroxyalkanoates (PHA), the favorable aspects of biodegradable polyurethane are its mechanical, physicochemical and biological properties can be tailored by varying the three blocks in polyurethane backbone, diisocyanate, diol and chain extender. In this thesis, we focus on the development of different functional biodegradable polyurethanes to study their structure-property relationships …

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Stimuli-Responsive Nanoparticles For Treatment Of Lung Cancer, Roshni Iyer Dec 2018

Stimuli-Responsive Nanoparticles For Treatment Of Lung Cancer, Roshni Iyer

Bioengineering Dissertations - Archive

Despite extensive research and progress in anti-cancer therapeutics, an effective treatment for non-small cell lung cancer (NSCLC) remains elusive, resulting in poor 5-year patient survival rate. Towards this end, we have explored a therapeutic regimen to improve the effects of local concurrent chemo-radiation-therapy (CRT), by utilizing multifunctional stimuli-responsive nanoparticles (NPs) as drug carriers. We have also utilized lung cancer targeting strategies for site-specific drug delivery, mainly antibodies against the Ephrin-transmembrane receptor kinase (EphA2), that is over-expressed mainly on lung cancer cells, to promote the targeted delivery of drugs to only cancer cells, and eventually reduce the toxicity to healthy tissues. …

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Teacher Perceptions Of School Culture After The Change From A Semester Schedule To A Trimester Schedule: A Phenomenological Study, Joseph Showell Dec 2018

Teacher Perceptions Of School Culture After The Change From A Semester Schedule To A Trimester Schedule: A Phenomenological Study, Joseph Showell

Educational Leadership & Policy Studies Dissertations - Archive

Principals newly assigned to a campus often begin their work by talking with staff, reviewing data, and evaluating the organizational structure with which they were entrusted (Daresh & Alexander, 2015). Common areas for review include campus budget, student performance on state and federal testing, overall operating systems such as the school bell schedule, school culture, and campus operating systems for communication (Daresh & Alexander, 2015). From this review, principals design action plans that they believe best fit the needs of the campus. The effectiveness of the principals’ action plans generally is based on quantitative student performance data from state and …

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Differential Effects Of Local Identity And Global Identity On Two Important Aspects Of Consumer Behavior: Price-Quality Judgments And Creativity, Sijie Sun Dec 2018

Differential Effects Of Local Identity And Global Identity On Two Important Aspects Of Consumer Behavior: Price-Quality Judgments And Creativity, Sijie Sun

Marketing Dissertations - Archive

Globalization has substantially influenced the world economy and also individuals. As a person with a cross-cultural background, it is fascinating to observe that different identities change individuals’ behavior. My dissertation focuses on cultural psychology and creativity with a specific focus on analyzing the effect of consumers’ local or global identity influences different aspects of consumer decision-making. In the first essay, consumers often rely on price to judge a product’s quality, especially when they do not have sufficient knowledge about attributes.However, how is such a tendency affected by consumers’ local-global identity, product type(e.g., services vs. goods; hedonic vs. utilitarian), and distribution …

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Understanding The Transition: Principals' Perception Of Coaching And Mentoring During Their First-Year, Dionel Clinton Waters Dec 2018

Understanding The Transition: Principals' Perception Of Coaching And Mentoring During Their First-Year, Dionel Clinton Waters

Educational Leadership & Policy Studies Dissertations - Archive

The limited amount of literature surrounding first-year principal support has typically focused on either preparing principals to become instructional leaders or emphasizing their managerial responsibilities (Bodger, 2011). This qualitative study examines eight first-year principals' perceptions of the coaching and/or mentoring support they received during their transition into the principalship. Using the first three stages of organizational socialization (Wardlow, 2008) as an analytical framework, findings indicate that the first-year principal participants considered coaching and mentoring as two distinct approaches of leadership assistance as they transitioned into their new role. Implications for further research could include examining the perceived impact of coaching …

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Development Of Particle Platforms For Delivery Of Angiogenic Reagents To Treat Peripheral Arterial Diseases, Duong Quang Le Dec 2018

Development Of Particle Platforms For Delivery Of Angiogenic Reagents To Treat Peripheral Arterial Diseases, Duong Quang Le

Bioengineering Dissertations - Archive

Peripheral arterial disease (PAD) is a disease that one or several peripheral arteries are narrowed or blocked. PAD is an emerging disease that cost annually 10-20 billions of US dollars for health care in America. PAD patients suffer high risk of limb loss, amputations and mortalities. At 5 years, the amputation rate for PAD is 40%-70% while the 5-year survival rate is less than 30%. For PAD patients undergoing acute and critical limb ischemia, surgery bypass and endovascular balloon/stenting are applied as standard treatments. However, surgical bypass is subject to patients’ readiness of autologous veins and the depth of arteries …

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Laboratory And Field Study Of A Liquid Ionic Soil Stabilizer, Sandesh Gautam Dec 2018

Laboratory And Field Study Of A Liquid Ionic Soil Stabilizer, Sandesh Gautam

Civil Engineering Theses - Archive

Chemical stabilization of expansive soil has been practiced for quite a time now. The use of lime/cement stabilization as a traditional method has been well acknowledged, understood and standard guidelines for practice have been developed. However, owing to certain demerits like high production and application cost, environmental impact, durability issues and most importantly incompatibility with high-sulfate soil leading to excessive heaving and swell, there is need to develop alternatives to these stabilizers. Non-traditional stabilizers like ionic soil stabilizer have been used by manufacturers in the past and claimed to effectively reduce the swell-shrink behavior of expansive soil. Undocumented results, the …

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