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

Digital Commons Network™

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

Purdue University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 2191 - 2220 of 7925

Full-Text Articles in Entire DC Network

A Thermally-Actuated Micro Shutter Array Device For Mask-Less Lithography, Zitao He May 2018

A Thermally-Actuated Micro Shutter Array Device For Mask-Less Lithography, Zitao He

Open Access Theses

Photolithography is a fundamental and important step in semiconductor manufacturing. It transfers the pattern (the structure of device to be fabricated) from photomask to silicon wafer. However, the traditional mask is un-flexible and costly. Here, an innovative cost-effective thermally-actuated dynamic mask is proposed which has flexibility of switching pattern arbitrarily by dividing the pattern into pixels. In this work, we demonstrated that a micro-shutter array device has the ability to operate as a dynamic mask for optical mask-less lithography. This device utilizes thermal expansion of bi-material cantilever for actuation. It has the ability to switch on and off to enable …

Go to article

Tweets Of Wrath: Assessing Social Media Influence In Organizational Crisis, Megan Courtaney Kendall May 2018

Tweets Of Wrath: Assessing Social Media Influence In Organizational Crisis, Megan Courtaney Kendall

Open Access Theses

For businesses and organizations, public perception is a critical factor in determining the effectiveness of crisis response strategies in mitigating reputational damage. However, current crisis literature offers little investigation into how public response found on social media can be measured and assessed. This case study seeks to better understand the role of online public perception in crisis and how social media are disrupting crisis communication strategies. On April 9th, 2017, United Airlines faced global outrage in an exceptional case that is both relevant and interesting in considering how online publics engaged with the crisis via social media after a video …

Go to article

Stretchable Thin-Film Electronics For Wearable Biomedical Applications, Min Ku Kim May 2018

Stretchable Thin-Film Electronics For Wearable Biomedical Applications, Min Ku Kim

Open Access Theses

Stretchable Thin-Film electronics which are mechanically reinforced by interconnected nanocomposite elastomers of high quality metallic nanowires deliver conducting paths for electronics. Due to the mechanical properties of the networked nanowires, the resistance against crack and edge delamination was improved. Theoretical and experimental studies demonstrates its enhancement in stretchability, adhesion to skin and resistance against crack generation and propagation. Such nanocomposite elastomer structures mechanically strengthened with networked nanocomposite can be fabricated into a class of biomedical devices capable of electrophysiological monitoring via the skin.

Go to article

Marchenko Redatuming And Imaging For Carbon Sequestration Monitoring: Application To The Frio Experiment., Mert Sinan Recep Kiraz May 2018

Marchenko Redatuming And Imaging For Carbon Sequestration Monitoring: Application To The Frio Experiment., Mert Sinan Recep Kiraz

Open Access Theses

The application of Marchenko redatuming and imaging for carbon sequestration monitoring using both synthetic and observed data from the Frio carbon sequestration experiment is investigated in this study. The Marchenko approach can be used to eliminate disturbing effects of overburden structure by placing virtual sources near target structures in the subsurface for seismic imaging. Two synthetic examples, one with a simple layered velocity model and one with a velocity model derived from the first arrival travel-times from the Frio carbon sequestration experiment are first investigated. Marchenko redatuming and inversion is then applied to the observed data from the Frio experiment …

Go to article

The Reliability Of Symphony Link In Emergency Scenarios, Anna Larson May 2018

The Reliability Of Symphony Link In Emergency Scenarios, Anna Larson

Open Access Theses

A wireless network is needed that can be taken into natural disaster areas. This network could use rapid requirements of group communication and be closely monitored with an assortment of sensors, for example displacement, temperature, noises, concentration, and pressure of chemicals (Chen et al., 2013). Disaster prevention is essential in any country, especially in metropolitan areas. Ad-hoc sensor networks have the ability to offer first responders with a quick deployable, economical, and dependable method to collect worthwhile knowledge in terms of possibility of people trapped within a comprised structure, and the condition of the area. From the statistical analysis, we …

Go to article

Supporting And Amplifying Teaching Experience Of New College Teachers, Siyan Liu May 2018

Supporting And Amplifying Teaching Experience Of New College Teachers, Siyan Liu

Open Access Theses

This thesis investigates how to amplify and support novice college teacher’s teaching experience. It has been found that a majority of percent novice teachers (55%) could not prepare there are lessons effectively (Fantilli & McDougall, 2009), many of them will spend a lot of time adapting to the educating and academic environment. The main issue is that these beginning teachers cannot recognize what kinds of methods are more effective to enhance their teaching efforts in the short period term. At the meanwhile, how to enhance their class quality as a crucial problem as well. There are several factors affecting the …

Go to article

Father Helps Best: Paternal Social Support In Television Sitcoms, Chelsea Moss May 2018

Father Helps Best: Paternal Social Support In Television Sitcoms, Chelsea Moss

Open Access Theses

The term paternal involvement is multi-faceted and includes engagement, accessibility, and responsibility (Lamb & Oppenheim, 1989). Specifically, when considering engagement, or actual time spent in interaction with children (Lamb, 2000; Lamb & Oppenheim, 1989), social support is one important consideration when understanding fathers’ influence on their children. In accordance with social role theory, individuals should expect to see television sitcom fathers behave in certain ways based on their social positions (Biddle, 1979; Eagly & Wood, 2011), potentially providing their children with various types and amounts of social support based on factors such as employment status of wife, socioeconomic status, and …

Go to article

“I’M Helping To Put A Man On The Moon”: Communicating Higher Purpose In The Workplace, Kristen Michele Olson May 2018

“I’M Helping To Put A Man On The Moon”: Communicating Higher Purpose In The Workplace, Kristen Michele Olson

Open Access Theses

Higher purpose in one’s work can be defined as a driving force that extends beyond oneself that fulfills some larger need, goal, or hope and perhaps benefits others. This construct may have important implications for workplace motivation and engagement. A survey by Calling Brands (2012) found that 65% of workers would put in more effort for an organization with a higher purpose. Furthermore, a joint study by Net Impact and Rutgers University found that for 24% of the workforce and 45% of college students, “a job that seeks to make a social or environmental difference in” (Zukin & Szeltner, 2012, …

Go to article

Effect Of Starch-Based Hydrogel On Early Growth Of Corn, Vaibhav Pathak May 2018

Effect Of Starch-Based Hydrogel On Early Growth Of Corn, Vaibhav Pathak

Open Access Theses

Seed coating with highly absorbent polymers can potentially improve the water availability for early growth of seeds under dry conditions and therefore prevent associated delays in the emergence and reduced crop stand. The limited number of studies on hydrogel seed coatings have shown that their effect on seed growth is not always beneficial, and varies with plant species, amount of hydrogel used and amount of available water in the growing medium. The current work studied the effect of hydrogel seed coating on the early growth of corn using starch-based biodegradable hydrogels. The hydrogels were prepared from potato starch (PS) and …

Go to article

Advanced Torque Control Strategy For The Maha Hydraulic Hybrid Passenger Vehicle., Pranay Banerjee May 2018

Advanced Torque Control Strategy For The Maha Hydraulic Hybrid Passenger Vehicle., Pranay Banerjee

Open Access Theses

An increase in the number of vehicles per capita coupled with stricter emission regulations have made the development of newer and better hybrid vehicle architectures indispensable. Although electric hybrids have more visibility and are now commercially available, hydraulic hybrids, with their higher power densities and cheaper components have been rigorously explored as the alternative. The most commonly used architecture is the series hybrid, which requires a power conversion from the primary source (engine) to the secondary domain. A positive displacement machine (pump) converts the rotational power of the engine into hydraulic power and a second positive displacement machine (motor) converts …

Go to article

A Lexically Driven Taxonomy For Political Campaign Interactions On Twitter, Joshua Curth May 2018

A Lexically Driven Taxonomy For Political Campaign Interactions On Twitter, Joshua Curth

Open Access Theses

Political candidates continuously develop new techniques for communicating to their targeted publics effectively through social media. One way to do so is through Twitter. This exploratory study maps Aristotelian rhetorical appeals to electoral tweets issued in the 2016 presidential election. Using automatic and human coding, the study proposes four different types of Twitter rhetorical appeals. Results show 58.8% of tweets issued during the presidential election are captured by the rhetorical taxonomy. The findings also show that the primary appeals both candidates use in both mass and salience did not always influence intention to vote. Finally, there are correlations between contextually …

Go to article

Using Corn Zein To Improve The Quality Of Gluten-Free Bread, Aminata Diatta May 2018

Using Corn Zein To Improve The Quality Of Gluten-Free Bread, Aminata Diatta

Open Access Theses

Cereals are the most highly produced crops in the world and their storage proteins account for up to 50% of the total protein necessary for the nutrition of humans. As the number of people with celiac disease grows and diagnosis of the disease is improved, the development of high quality gluten-free foods is very important. Zein, the prolamin of maize (Zea mays L.) is used in this study in combination with starches to replace some of the functionality of wheat gluten. Zein can be made viscoelastic when it is freed and separated from protein bodies, and when it is moistened …

Go to article

User Adoption Of Home Automation Technology, Pranavi Settipalle May 2018

User Adoption Of Home Automation Technology, Pranavi Settipalle

Open Access Theses

Technological advancements are redefining what is possible every day. There are various products in the market that have the potential to improve the quality of living when understood and used right. Yet a lot of people resist changes in their digital usage. The first cell phone was released in the same decade as home automation was proposed. The reason for the cell phone’s success and home automation’s failure is user adoption. The initial cell phones were underdeveloped and had their problems, but wide acceptance allowed for research to develop them into what we use today, and that has changed our …

Go to article

The Influence Of Carrier Water Ph On Efficacy Of Fungicides For Turf Disease Control, Trevor R. Stacy May 2018

The Influence Of Carrier Water Ph On Efficacy Of Fungicides For Turf Disease Control, Trevor R. Stacy

Open Access Theses

Fungicides are most often mixed with water and applied as a dilute spray for controlling diseases on golf course turf. Although published reports show that water quality can influence the performance of certain herbicides, evidence of similar effects on fungicide efficacy is weak and largely anecdotal. The objective of this research was to investigate the influence of water pH on efficacy of fungicides commonly used against dollar spot, a problematic disease on creeping bentgrass. In this study, three fungicides (metconazole, thiophanate-methyl, and iprodione) were mixed with water stabilized at three pH levels (pH= 5.0, 7.0, and 9.0) in in vitro …

Go to article

Sentiment Analysis On Financial News And Microblogs, Chinmay Talekar May 2018

Sentiment Analysis On Financial News And Microblogs, Chinmay Talekar

Open Access Theses

Sentiment analysis is useful for multiple tasks including customer satisfaction metrics, identifying market trends for any industry or products, analyzing reviews from social media comments. This thesis highlights the importance of sentiment analysis, provides a summary of seminal works and different approaches towards sentiment analysis. It aims to address sentiment analysis on financial news and microblogs by classifying textual data from financial news and microblogs as positive or negative. Sentiment analysis is performed by making use of paragraph vectors and logistic regression in this thesis and it aims to compare it with previously performed approaches to performing analysis and help …

Go to article

Engineering Genetically Encoded Sensors To Study Purinergic Signaling, Stephen Valentino May 2018

Engineering Genetically Encoded Sensors To Study Purinergic Signaling, Stephen Valentino

Open Access Theses

Extracellular adenosine triphosphate (ATP) is a key purinergic signal that mediates cell-to cell communication both within and between organ systems. We address the need for a robust and minimally invasive approach to measuring extracellular ATP by re-engineering the ATeam ATP sensor to be expressed on the cell surface. Using this approach, we image real-time changes in extracellular ATP levels with a sensor that is fully genetically-encoded and does not require an exogenous substrate. Using live-cell microscopy, we characterize sensor performance when expressed on cultured Neuro2A cells, and we measure both stimulated release of ATP and its clearance by ectonucleotidases. In …

Go to article

Blokcar: Creating Interactive In-Car Entertainment System For Children, Hsin-Man Wu May 2018

Blokcar: Creating Interactive In-Car Entertainment System For Children, Hsin-Man Wu

Open Access Theses

The research proposes an in-car entertainment system for children to relieve their in-car boredom and further enhance the travel experience. While more and more attention has already been paid on human-car interaction, there is still very limited research considering the interaction between back seat passengers and the car. This project aims to explore the new research area and solve the problems for the children passengers. Based on the research (Price & Matthews, 2013; Wilfinger et al., 2011), many parents reported the quality time they spent with their children in the car was invaluable. Due to the limited space of a …

Go to article

The Impacts Of Providing And Receiving Formative Peer Feedback On Secondary Students Achievement On A Graphic Design Project, Emily Yoshikawa May 2018

The Impacts Of Providing And Receiving Formative Peer Feedback On Secondary Students Achievement On A Graphic Design Project, Emily Yoshikawa

Open Access Theses

Formative assessment is a widely accepted practice in education today aimed towards high student achievement (Gielen & De Weaver, 2015). Despite its’ acceptance, there remains some confusion, as well as contradictory ideas, around the best practices of formative assessment and, explicitly, feedback through formative assessment (Shute, 2008). There is specifically a lack of clarity on the impact of individual elements of providing and/or receiving formative feedback on student achievement. Further, the influence of this feedback, if provided to/from peers in formative settings, is not fully understood (Liu & Carless, 2006). These ideas are important to understand so as to help …

Go to article

A 360 Vr And Wi-Fi Tracking Based Autonomous Telepresence Robot For Virtual Tour, Yeonju Oh May 2018

A 360 Vr And Wi-Fi Tracking Based Autonomous Telepresence Robot For Virtual Tour, Yeonju Oh

Open Access Theses

This study proposes a novel mobile robot teleoperation interface that demonstrates the applicability of a robot-aided remote telepresence system with a virtual reality (VR) device to a virtual tour scenario. To improve realism and provide an intuitive replica of the remote environment for the user interface, the implemented system automatically moves a mobile robot (viewpoint) while displaying a 360-degree live video streamed from the robot to a VR device (Oculus Rift). Upon the user choosing a destination location from a given set of options, the robot generates a route based on a shortest path graph and travels along that the …

Go to article

A Study Of Student Comfort And Satisfaction Within Green Residence Halls, Wesley Matthew Young May 2018

A Study Of Student Comfort And Satisfaction Within Green Residence Halls, Wesley Matthew Young

Open Access Theses

This research contributes to a better understanding of whether green university residential halls benefit students by creating better occupant comfort and satisfaction. Residential halls were considered green by this thesis if they achieved LEED certification. This study addresses Indoor Environmental Quality (IEQ) in relation to comfort and satisfaction among the college students living in residential halls. The present study surveyed Purdue University students living in a conventional residence hall (First Street Towers) compared with students living in a LEED Gold certified residence hall (Third Street Suites) regarding the comfort and satisfaction provided by their residence halls. A Building Use Studies …

Go to article

A 3d-Cell Based Assay To Detect Shiga-Like Toxin Producing Escherichia Coli, Celina To May 2018

A 3d-Cell Based Assay To Detect Shiga-Like Toxin Producing Escherichia Coli, Celina To

Open Access Theses

Shiga-like toxin producing Escherichia coli (STEC), a foodborne pathogen, poses a serious public health risk. Rapid detection of STEC in the food supply remains to be a challenge because current detection methods lack the ability to differentiate viable and non-viable STEC or active and inactive Shiga-like toxins (Stx) in less than 24 h. Here, our goal was to develop a mammalian cell-based assay (CARD) for rapid high-throughput detection of Shiga-toxin producing Escherichia coli using Vero (monkey kidney epithelial cells) or THP-1 (human monocyte cell) cell lines. Initially, optimal mammalian cell concentration needed to show a maximum cytotoxicity towards a membrane …

Go to article

Bioconjugation Techniques To Construct Spontaneously Assembling Dna-Enzyme Macromolecules, Malithi Wickramathilaka May 2018

Bioconjugation Techniques To Construct Spontaneously Assembling Dna-Enzyme Macromolecules, Malithi Wickramathilaka

Open Access Dissertations

In the past two decades, crosslinking has been a popular choice in synthesizing bioconjugatesinthefieldsofbiotechnology,medicaldiagnostics,andgeneticscreening.However, their efficacyin synthesizing the desired bioconjugates is scarcely analyzed and documented. The scope of this investigation encompassed studying covalent bioconjugation techniques, and determining the structural characteristics of the bioconjugates formed via several crosslinking strategies. The major goal of the study was to determine relatively inexpensive, less complex, and universal bioconjugation techniques with the flexibility to control the distance between wild-type enzymes. In this investigation, three different crosslinkers were studied to determine the efficacy of crosslinking biological molecules. In the first aim of the study, an adapted …

Go to article

Punishment Of Public Corruption In China And The United States, Linjing Wang May 2018

Punishment Of Public Corruption In China And The United States, Linjing Wang

Open Access Dissertations

Corruption is pervasive in many countries. However, the most effective punishment to deter corruption remains unknown. Some have suggested that the death penalty is required to reduce corruption and ensure clean government. However, research shows that the likelihood of punishment is the strongest factor, not the severity of the punishment. It requires large social costs, such as expenditure on policemen, court personnel, and specialized monitoring equipment, to improve the probability of punishment. Can elevation of the severity of punishment be a good substitute? The empirical results from this dissertation suggest that the probability of punishing corruption, i.e., how likely a …

Go to article

Advanced Imaging Techniques For Point-Measurement Analysis Of Pharmaceutical Materials, Shijie Zhang May 2018

Advanced Imaging Techniques For Point-Measurement Analysis Of Pharmaceutical Materials, Shijie Zhang

Open Access Dissertations

Drugs are an essential element protecting human lives from many diseases such as cancer, diabetes, and cardiovascular disorders. One of the highlights in drug development in recent years is the establishment of rational drug design: a collection of various multi-disciplinary approaches that at the core, focus on designing molecules with specific properties for identified targets and biomolecules with known functional roles and structural information. The candidate molecules will then go through a series of examinations to characterize their physiochemical properties, and an iterative process is used to improve the design of the drug to achieve desirable attributes. The time consuming …

Go to article

Context-Preserving Visual Analytics Of Multi-Scale Spatial Aggregation., Jiawei Zhang May 2018

Context-Preserving Visual Analytics Of Multi-Scale Spatial Aggregation., Jiawei Zhang

Open Access Dissertations

Spatial datasets (i.e., location-based social media, crime incident reports, and demographic data) often exhibit varied distribution patterns at multiple spatial scales. Examining these patterns across different scales enhances the understanding from global to local perspectives and offers new insights into the nature of various spatial phenomena. Conventional navigation techniques in such multi-scale data-rich spaces are often inefficient, require users to choose between an overview or detailed information, and do not support identifying spatial patterns at varying scales. In this work, we present a context-preserving visual analytics technique that aggregates spatial datasets into hierarchical clusters and visualizes the multi-scale aggregates in …

Go to article

Object-Oriented User Interface Customization Framework: Customizing Complex User Interfaces To Improve Usability And User Performance., Le Zhang May 2018

Object-Oriented User Interface Customization Framework: Customizing Complex User Interfaces To Improve Usability And User Performance., Le Zhang

Open Access Dissertations

The objective of this research is to use four individual studies to validate the Object-Oriented User Interface Customization (OOUIC) framework for solving three challenges of implementing User Interface (UI) customization in Complex Information System (CIS) and improving usability and user performance of complex UI. The first challenge is that adaptive UI, which tailors a UI to be relevant to a user role, has difficulties in identifying numerous users’ complex requirements and simplifying UIs for them. The second challenge is that adaptive UI cannot satisfy every individual’s unique needs. The third challenge is that adaptable UI, which allows a user to …

Go to article

Approximating Properties Of Data Streams, Samson Zhou May 2018

Approximating Properties Of Data Streams, Samson Zhou

Open Access Dissertations

In this dissertation, we present algorithms that approximate properties in the data stream model, where elements of an underlying data set arrive sequentially, but algorithms must use space sublinear in the size of the underlying data set. We first study the problem of finding all k-periods of a length-n string S, presented as a data stream. S is said to have k-period p if its prefix of length n − p differs from its suffix of length n − p in at most k locations. We give algorithms to compute the k-periods of a string S using poly(k, log n) …

Go to article

College Readiness And Digital Badges: A Middle School Approach, Blake C. Nemelka May 2018

College Readiness And Digital Badges: A Middle School Approach, Blake C. Nemelka

Open Access Dissertations

Post-secondary education attainment results in higher salaries (Pew Research Center, 2014) and an increase in positive societal benefits (Baum, Ma, & Payea, 2013). Nevertheless, only 31% of U.S. citizens over the age of 25 have a bachelor’s degree (U.S. Census Bureau, 2014). While tradition would dictate the preparation for going to college begins in the later high school years (Gaertner & McClarty, 2015), a recent push has emerged for shifting the beginning of such conversations to middle school (Curry, Belser, & Binns, 2013; Gaertner & McClarty, 2015; Mattern, Allen, & Camara, 2016; Nemelka & Nemelka, 2016). Furthermore, advances in educational …

Go to article

Optical Studies Of Novel Electronic Materials, Nirajan Mandal May 2018

Optical Studies Of Novel Electronic Materials, Nirajan Mandal

Open Access Dissertations

We have made a Kerr rotation (KR) measurement instrument with a 635 nm laser that is sensitive enough to measure KR angle of few micro-radians. The KR instrument was used to study the current induced polarization rotation of light as it is reflected off the surface of topological insulator Bi2Te2Se (BTS221). In our experiment, we observe a linear response of Kerr rotation with current and the Kerr rotation for both s and p-polarized light is negative. From the dependence of this polarization rotation on the current in the TI sample, the angle of incidence of light and the light polarization, …

Go to article

The English In The Levant: Commerce, Diplomacy, And The English Nation In The Ottoman Empire, 1672-1691, Zachary W. Schulz May 2018

The English In The Levant: Commerce, Diplomacy, And The English Nation In The Ottoman Empire, 1672-1691, Zachary W. Schulz

Open Access Dissertations

This dissertation examines the English who went to the Levant. Specifically, it analyzes the merchants, factors, ambassadors, chaplains, and embassy staff members who traveled to the Near East for either bureaucratic, commercial, or scholastic motivations. During their time abroad, these men amassed a wealth of knowledge and pecuniary resources, simultaneously furthering the countless interests forced upon them by the Levant Company and/or the English government. Thus, this dissertation asserts that the Ottoman Empire acted as a training ground for English emissaries, providing those who were abroad with the means of returning home to better positions of political, commercial, and/or diplomatic …

Go to article

First Prev Next Last