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Dynamic Adhesion and Self-cleaning Mechanisms of Gecko Setae and Spatulae
Geckos can freely climb on walls and ceilings against their body weight at speed of over 1ms-1. Switching between attachment and detachment seem simple and easy for geckos, without considering the surface to be dry or wet, smooth or rough, dirty or clean. In addition, gecko can shed dirt particles during use, keeping the adhesive pads clean. Mimicking this biological system can lead to a new class of dry adhesives for various applications. However, gecko’s unique dry self-cleaning mechanism remains unknown, which impedes the development of self-cleaning dry adhesives. In this dissertation we provide new evidence and self-cleaning mechanism to explain how gecko shed particles and keep its sticky feet clean. First we studied the dynamic enhancement observed between micro-sized particles and substrate under dry and wet conditions. The adhesion force of soft (polystyrene) and hard (SiO2 and Al2O3) micro-particles on soft (polystyrene) and hard (fused silica and sapphire) substrates was measured using an atomic force microscope (AFM) with retraction (z-piezo) speed ranging over 4 orders of magnitude. The adhesion is strongly enhanced by the dynamic effect. When the retraction speeds varies from 0.02 µm/s to 156 µm/s, the adhesion force increases by 10% ~ 50% in dry nitrogen while it increases by 15%~70% in humid air. A dynamic model was developed to explain this dynamic effect, which agrees well with the experimental results. Similar dynamic enhancement was also observed in aqueous solution. The influence of dynamic factors related to the adhesion enhancement, such as particle inertia, viscoelastic deformations and crack propagation, was discussed to understand the dynamic enhancement mechanisms. Although particles show dynamic enhancement, Gecko fabrillar hair shows a totally different trend. The pull off forces of a single gecko seta and spatula was tested by AFM under different pull-off velocities. The result shows that both the spatula and the seta have a rate independent adhesion response in normal retraction, which is quite different from micro-particles. Further research indicated the shape of the contact area was a key factor to the dynamic effect. In order to verify this hypothesis, artificial gecko spatula made of glass fibers was nanofabricated by a focus ion beam (FIB) and tested by AFM. These manmade spatulae also show a rate independent adhesion response. The dynamic adhesion of a single gecko seta and spatula were simulated with finite element analysis and the results also confirm the rate independent phenomena.. In conclusion, self-cleaning is induced by dynamic effect during gecko locomotion. The relative dynamic adhesion change between particles and seta makes it possible for gecko to shed the dirt particles while walking.Finally, the fatigue property of gecko seta was examined with the atomic force microscope under cyclic attachment/detachment process, mimicking gecko running. The adhesion force versus cycles has been tested and evaluated. Fatigue mechanism of gecko seta was also analyzed based on the experimental findings. digital.library.unt.edu/ark:/67531/metadc407812/
Exploring the Impacts of Fashion Blog Type and Message Type on Female Consumer Response Towards the Brand
The current study examines the influences of blog type and blog message type on consumers’ perceptions of brand credibility and brand similarity. Additionally, the study seeks to understand the interaction effects of blog type and message type on brand credibility and brand similarity and on consumer engagement with a blog. The findings reveal that message type, specifically product message, is an important consideration when marketers want to illustrate similarities between the brand and consumers. Additionally, it was found that product messages should be considered when encouraging consumer engagement with a blog. However, blog type did not have an effect on consumer perceptions of brand credibility and similarity or consumer engagement. digital.library.unt.edu/ark:/67531/metadc407834/
True Bromance: Representation of Masculinity and Heteronormative Dominance in the Bromantic Comedy
This project explores the representation of white, American masculinity within the Hollywood bromantic comedy cycle. By analyzing three interrelated components (close homosociality, infantilization, and relationship to patriarchy) of the model of masculinity perpetuated by this cycle of films, this study reveals the hegemonic motives therein. Despite the representation of a masculinity nervously questioning its position within the romantic comedy narrative and the broader patriarchal structure, the results of this representation are, ultimately, regressive and reactionary. Cultural gains made concerning gender, sexuality, and race are doubled back upon in a cycle of films that appeal to regressive modes of misogyny, homophobia, and racism still present in Hollywood filmmaking, and the hegemony of white, patriarchal heteronormativity is rigorously maintained. digital.library.unt.edu/ark:/67531/metadc407801/
Studies on High Potential Porphyrin-fullerene Supramolecular Dyads
Photoinduced electron transfer in self-assembled via axial coordination porphyrin-fullerene dyads is investigated. Fullerene functionalized with imidazole and fullerenes functionalized with pyridine are chosen as electron acceptors, while zinc pophyrin derivatives are utilized as electron donors. The electron withdrawing ability of halogen atoms make the porphyrin ring electrophilic, which explained the binding of (F20TPP)Zn with fullerene derivatives having the highest binding constant around 105M-1. Another important observation is that the fullerene imidazole binding to zinc pophyrin had higher stability than fullerene pyridine-porphyrin dyad. Computational DFT B3LYP-21G(*) calculations are used to study the geometric and electronic structures. The HOMO and LUMO was found to be located on the porphyrin and fullerene entities, respectively. Photoinduced electron transfer is investigated by the steady-state absorption and emission, differential pulse voltammetry, and nanosecond and femtosecond transient absorption studies. The measurements provided the same conclusion that the increasing number of the halogen atoms on the porphyrin ring leads to the higher binding of porphyrin-fullerene supramolecular dyads and efficient charge separation and charge recombination processes. digital.library.unt.edu/ark:/67531/metadc407825/
The Issues of Compliance and Interoperability in Integrating Heterogeneous Digital Resources: Lessons from the Texas History Portal
Paper for the 2005 IS&T Archiving Conference. This article discusses the issues of compliance and interoperability in integrating heterogeneous digital resources and lessons from the Texas History Portal. digital.library.unt.edu/ark:/67531/metadc406376/
No Dust in the Stacks: Creating a Customized Local Serials Collection on the Fly
Poster presented at the 2014 Charleston Annual Library Conference. This poster discusses creating a customized local serials collection on the fly. digital.library.unt.edu/ark:/67531/metadc406378/
Textbooks Weighing you Down? Check out our E-Readers
Article discussing a project by the UNT Libraries to purchase e-book readers for students purchasing digital textbooks. digital.library.unt.edu/ark:/67531/metadc406379/
Sample Core Journal List Spreadsheet
Spreadsheet document accompanying a poster for the 2014 Charleston Annual Library Conference. This spreadsheet is a sample of a core journal list for specialized or small academic libraries. digital.library.unt.edu/ark:/67531/metadc406375/
Managing Serials in a Large Digital Library: Case Study of the UNT Libraries Digital Collections
Article discussing a case study of the UNT Libraries digital collections and managing serials in a large digital library. digital.library.unt.edu/ark:/67531/metadc406384/
Mentoring to Grow Library Leaders
Article discussing mentoring and growing library leaders. digital.library.unt.edu/ark:/67531/metadc406380/
"Blow the Curtain Open": How Gene Hall and Leon Breeden Advanced the Legitimacy of Jazz in Music Education [Presentation Notes]
Notes accompanying a presentation for the Jazz Education Network Fifth Annual Conference. These notes and the presentation discuss how Gene Hall and Leon Breeden advanced the legitimacy of jazz in music education. digital.library.unt.edu/ark:/67531/metadc406359/
"Blow the Curtain Open": How Gene Hall and Leon Breeden Advanced the Legitimacy of Jazz in Music Education [Presentation]
Presentation for the Jazz Education Network Fifth Annual Conference. This presentation discusses how Gene Hall and Leon Breeden advanced the legitimacy of jazz in music education. digital.library.unt.edu/ark:/67531/metadc406353/
UNT Libraries Strategic Plan Priorities FY 2014-2017: Key prospective Goal Areas for the UNT Libraries
This report summarizes key strategic priorities for the UNT Libraries in the FY 2014-2017 period, and will inform planning activities during this time. This document should be read in close conjunction with other associated strategic planning documents of the UNT Libraries, including the following: 2014 Strategic Plan Alignment Map of UNT Libraries and Academic Affairs, UNT Libraries Strategic Plan 2011-2015, and UNT Press Strategic Plan 2014-2019. This document lays out the primary directions that the UNT Libraries will undertake during the coming four years. It builds on previous work and accomplishments during the 2011-2014 period, and serves as a transitional planning guide for moving beyond the 2011-2015 strategic plan. The most important priority for the next three years will be the first one listed: improving library resources. Without adequate resources, it is unlikely that progress will be made on the other priorities. digital.library.unt.edu/ark:/67531/metadc406348/
How Descriptive Metadata Changes in the UNT Libraries' Collection: A Case Study
Paper describing the results of initial research to evaluate general information about how records change in a digital library, using the UNT digital collections as a sample set. The analysis looked at several key concepts including the number of records that have been edited, the number of edits per record, the number of editors per record, the amount of change in file size and in completeness (i.e., values in required fields), and changes in access to digital objects. digital.library.unt.edu/ark:/67531/metadc406345/
Ensuring Long-Term Access to Electronic Theses and Dissertations: Local vs. Global Lifecycle Management
Presentation for the 2014 Texas Library Association (TLA) Annual Conference. This presentation discusses ensuring long-term access to electronic theses and dissertations and local versus global lifecycle management. digital.library.unt.edu/ark:/67531/metadc406366/
Balancing Scholarly Activities, Primary Assignments and Service to the Community
Presentation for the University of North Texas (UNT) Libraries as part of the career development program. This presentation discusses getting started on a research project and balancing scholarly activities, primary assignments, and service to the community. digital.library.unt.edu/ark:/67531/metadc406368/
UNT's Theses and Dissertations Retrospective Digitization Project
Poster presented at the 2014 United States (U.S) Electronic Theses and Dissertations (ETDs) Annual Conference. This poster discusses the University of North Texas' (UNTs) retrospective digitization project of theses and dissertations. digital.library.unt.edu/ark:/67531/metadc406331/
A REST API for Library Data
Poster presented at the 2014 International Conference on Dublin Core and Metadata Applications. This poster discusses a library catalog REST API framework. digital.library.unt.edu/ark:/67531/metadc406332/
Data Management in the UNT Digital Library
Presentation for the Texas Digital Library (TDL) Data Management Workgroup. This presentation discusses data management in the University of North Texas (UNT) Digital Library. digital.library.unt.edu/ark:/67531/metadc406361/
UNT Scholarly Works
Presentation for the University of North Texas (UNT) School of Library and Information Science (SLIS) 5740 course, Introduction to Digital Libraries. This presentation discusses the UNT Scholarly Works institutional repository and gives a brief history, submissions and workflow processes, copyright and publisher considerations, and open access issues. digital.library.unt.edu/ark:/67531/metadc406371/
When Fulltext Searching Isn't Enough: Text Encoding for Manuscripts and Other Special Collections Materials
Presentation for the Cross Timbers Library Collaborative (CTLC) Special Collections Affinity Group Fall 2014 Meeting. This presentation discusses text encoding for manuscripts and other special collections materials. digital.library.unt.edu/ark:/67531/metadc406356/
Using the Power of Excel... To help with cutting a budget
Presentation for an Association for Library Collections & Technical Services (ALCTS) webinar. This presentation discusses using Excel to help cut budgets. digital.library.unt.edu/ark:/67531/metadc406351/
Open Access and ETDs
Poster presented at the 2014 United States (U.S) Electronic Theses and Dissertations (ETDs) Annual Conference. This poster discusses open access and ETDs. digital.library.unt.edu/ark:/67531/metadc406342/
Lexicon of Jazz Invective: Hurling Insults Across a Century with Big Data [presentation]
Presentation for the Texas Music Library Association Fall 2014 Meeting. This presentation discusses the lexicon of jazz invective and hurling insults across a century with big data. digital.library.unt.edu/ark:/67531/metadc406370/
Lexicon of Jazz Invective: Hurling Insults Across a Century with Big Data [presentation notes]
Notes accompanying a presentation for the Texas Music Library Association Fall 2014 Meeting. These notes and the presentation discuss the lexicon of jazz invective and hurling insults across a century with big data. digital.library.unt.edu/ark:/67531/metadc406365/
How Descriptive Metadata Changes in the UNT Libraries' Collection: A Case Study [Presentation]
Presentation for the 2014 DCMI International Conference on Dublin Core and Metadata Applications. This presentation discusses a case study of how descriptive metadata changes in the UNT Libraries' collections. digital.library.unt.edu/ark:/67531/metadc406363/
ASIS&T Special Interest Groups (SIGs): New Member/First Conference Brunch 2012
Presentation for the 2012 American Society for Information Science and Technology (ASIS&T) Annual Meeting. This presentation introduces new members and conference attendees to the Special Interest Group, International Information Issues (SIG-III). digital.library.unt.edu/ark:/67531/metadc406369/
A For-Fee Publishing Service for the Local Community [Presentation]
Presentation for Amigos Library Services online conference, "Libraries, Authors, and Publishing." This presentation discusses a for-fee publishing service for the local community. digital.library.unt.edu/ark:/67531/metadc406354/
Southwest Retort, Volume 66, Number 9, May 2014
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc406329/
Southwest Retort, Volume 67, Number 1, September 2014
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community. digital.library.unt.edu/ark:/67531/metadc406330/
Vann Victorian Collection: An Exhibit at UNT Libraries Special Collections
The Vann Victorian Collection is a treasure of the University of North Texas Libraries and an exceptional resource for the study of Victorian literature. This exhibit showcases some pieces from the collection, including rare first editions, part-issue editions, and association copies. Dr. J. Don Vann, Professor Emeritus at UNT, curated this exhibit. Don and Dolores Vann began collecting Victorian books in 1962, when they acquired a first edition of Dickens’s Bleak House. They spent the summer of 1965 in London, conducting research in the British Library and buying first editions of works by Charles Dickens and William Makepeace Thackeray. During their subsequent trips to London, the Vanns came to know many of the city’s booksellers and were offered first editions they kept hidden from all but their most favorite customers. In 2004 Don and Dolores established the Vann Victorian Endowment to provide a permanent fund to purchase Victorian books for the Vann Victorian Collection in Special Collections at the University of North Texas Libraries. Since 2004 the Vanns have made additional contributions to the collection, most recently in 2014. digital.library.unt.edu/ark:/67531/metadc405097/
Digitizing Newspapers with the Quartz A0 Scanner
Presentation for the 2014 National Digital Newspaper Program (NDNP) Awardee Conference. This presentation discusses digitizing newspapers with the Quartz A0 scanner. digital.library.unt.edu/ark:/67531/metadc402452/
In Search of Charles B. Ward [Presentation Notes]
Notes accompanying a presentation for the 2014 Digital Frontiers Annual Conference. The notes and presentation discuss Charles B. Ward (1864-1917) and include a biography and further implications for biography and musical reception history through resources originally created with different purposes in mind. digital.library.unt.edu/ark:/67531/metadc402448/
In Search of Charles B. Ward [Presentation]
Presentation for the 2014 Digital Frontiers Annual Conference. This presentation discusses Charles B. Ward (1864-1917) and includes a biography and further implications for biography and musical reception history through resources originally created with different purposes in mind. digital.library.unt.edu/ark:/67531/metadc402461/
From a Shed in Ojai to a Library in Denton: Reassembling and Preserving the Maynard Ferguson Collection at UNT [Presentation]
Presentation for the 2010 Texas Music Library Association (TMLA) Annual Meeting. This presentation discusses reassembling and preserving the Maynard Ferguson collection at the University of North Texas (UNT) Libraries. digital.library.unt.edu/ark:/67531/metadc402463/
From a Shed in Ojai to a Library in Denton: Reassembling and Preserving the Maynard Ferguson Collection at UNT [Presentation Notes]
Notes accompanying a presentation for the 2010 Texas Music Library Association (TMLA) Annual Meeting. These notes and the presentation discuss reassembling and preserving the Maynard Ferguson collection at the University of North Texas (UNT) Libraries. digital.library.unt.edu/ark:/67531/metadc402453/
"In Case of Sudden Death, Burn This": The Simon Bucharoff Collection at the University of North Texas Music Library [Presentation Notes]
Notes accompanying a presentation for the 2012 Texas Music Library Association (TMLA) Annual Meeting. The notes and presentation discuss the Simon Bucharoff collection at the University of North Texas (UNT) music library. digital.library.unt.edu/ark:/67531/metadc402456/
"In Case of Sudden Death, Burn This": The Simon Bucharoff Collection at the University of North Texas Music Library [Article]
Article discussing the Simon Bucharoff collection at the University of North Texas (UNT) music library. digital.library.unt.edu/ark:/67531/metadc402447/
"In Case of Sudden Death, Burn This": The Simon Bucharoff Collection at the University of North Texas Music Library [Presentation]
Presentation for the 2012 Texas Music Library Association (TMLA) Annual Meeting. This presentation discusses the Simon Bucharoff collection at the University of North Texas (UNT) music library. digital.library.unt.edu/ark:/67531/metadc402465/
Budget Status of the UNT Libraries 2014: Library Town Hall Meeting on the Library Budget Shortfall
Presentation for the September 2014 Library Town Hall Meeting. This meeting discusses University of North Texas (UNT) Libraries budget status and shortfalls. digital.library.unt.edu/ark:/67531/metadc335343/
Combined Library Services Desk: Round Table Discussion
Presentation for a round table discussion at the 2013 Cross Timbers Library Collaborative (CTLC) Annual Conference. This presentation discusses combining library service desks. digital.library.unt.edu/ark:/67531/metadc335341/
UNT Libraries Digital Collections: An Overview
Presentation for a meeting at Texas A & M University. This presentation gives an overview of the University of North Texas (UNT) Libraries digital collections. digital.library.unt.edu/ark:/67531/metadc335320/
Redefining Collection Development at UNT Libraries
Presentation for the June 12, 2014 University of North Texas (UNT) Library Dean's Council meeting. This presentation discusses a proposal for redefining collection development at the UNT Libraries. digital.library.unt.edu/ark:/67531/metadc335293/
Art book indexes reviewed
Article discussing index characteristics considered important by reviewers of art books. digital.library.unt.edu/ark:/67531/metadc335281/
White Paper: Redefining Collection Development at University of North Texas Libraries
Paper discussing a proposal for redefining collection development at the University of North Texas (UNT) Libraries. digital.library.unt.edu/ark:/67531/metadc335286/
Open Letter to the UNT Community: Planning for FY13 Library Budget Reductions - March 6, 2012
Letter to the University of North Texas (UNT) community from the Dean of the UNT Libraries, Dr. Martin Halbert. This letter discusses planning for the 2013 fiscal year library budget reductions. digital.library.unt.edu/ark:/67531/metadc333019/
Culinary Indexing Reference Sources Questionnaire
Questionnaire for a study gathering recommendations of reference sources for culinary indexing. This questionnaire accompanies "Culinary Indexers' Reference Sources," and results of the study were presented at the 2014 Conference of the American Society for Indexing and the Culinary Indexing Special Interest Group. digital.library.unt.edu/ark:/67531/metadc333021/
From Theses and Dissertations to ETD: Retrospective Digitization and New Forms of Scholarship
Presentation for the 2014 Cross Timbers Library Collaborative (CTLC) Annual Conference. This presentation discusses electronic theses and dissertations (ETDs) and retrospective digitization and new forms of scholarship. digital.library.unt.edu/ark:/67531/metadc333035/
Mapping the Way for Information Literacy Skills in Child Development Research
Presentation for the 2014 International Federation of Library Associations and Institutions (IFLA) Information Literacy Satellite Meeting on conjunction with the IFLA World Library and Information Congress. This presentation discusses mapping the way for information literacy skills in child development research. digital.library.unt.edu/ark:/67531/metadc333017/
Librarians and Technology: Things to Consider
Article on librarians and technology and things to consider. digital.library.unt.edu/ark:/67531/metadc333044/