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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

Design of Organic Radical-Based Materials for Electrical and Magnetic Applications

Zihao Liang (8270631) 05 September 2023 (has links)
<p dir="ltr">Nonconjugated radical polymers and small molecules are employed as electrically conducting materials in multiple organic electronic devices, including electrolyte-supported devices and solid-state electronic devices, because of their charge transport and redox-active properties. In fact, macromolecules with nonconjugated backbones and stable radical pendent groups can have impressive charge transport capabilities (i.e., thin-film conductivities of ~20 S m<sup>-1</sup>) if proper molecular design principles are employed.</p><p dir="ltr">In the first part of this work, a polysiloxane-based polymer bearing galvinoxyl radical groups has been synthesized. Density functional theory (DFT) calculations predicted that the spin delocalization behavior of the galvinoxyl group would result in a higher charge transfer rate compared with nitroxide radical systems. It is determined that the flexible backbone endowed the polymer with a glass transition temperature around 0 ℃, and this feature allowed the radical moieties to pack into conductive domains after thermal annealing. Furthermore, the conductivity of this radical polymer was quantified to be ~ 10<sup>-1</sup> S m<sup>-1</sup> after being cast into a thin film. Thus, these studies provide a strategy to direct molecular packing and facilitate charge transport in radical polymers with delocalized open-shell sites, which can aid in deciphering the charge transport mechanism in radical polymer thin films.</p><p dir="ltr">In the second part of this work, the charge transport and the magnetic properties of several nitroxide radical-based small molecules have been studied because 1) despite the success of nonconjugated radical polymers as solid-state charge conductors, the charge transport properties of nonconjugated open-shell small molecules have received less attention despite the fact that studying small molecule systems can facilitate the development of macromolecular radical conductors; 2) the unpaired electrons on these materials provide a means by which to respond to magnetic fields, making these materials promising candidates for organic magnets. Motivated by the need to develop open-shell small molecule materials, we quantify the electrical conductivity and magnetic properties in organic radical single crystals. Through proper molecular engineering of functional groups, we synthesized and crystallized a nitroxide radical-based material that has a single-crystal electrical conductivity of ~3 S m<sup>-1</sup>, which is the highest values over 1 µm-scale for nonconjugated organic materials reported to date. Furthermore, we manipulate the molecular packing of the nitroxide radical molecules in the single crystals by introducing alkyl chains to the molecular structures. As a result, a strong antiferromagnetic ordering is obtained in the crystals with a Néel temperature of 40 K. In conclusion, new open-shell materials are developed with excellent charge transport capabilities and strong magnetic properties. This effort provides clear insights into designing the next-generation organic radical electrical conductors and magnetic materials.</p>
32

Improving outcomes at science museums: Blending formal and informal environments to evaluate a chemical and physical change exhibit

Christian, Brittany Nicole 06 August 2012 (has links)
No description available.
33

Life on Long Street: A Story of Trials, Triumphs, and Community in King Lincoln- An Exhibition Prospectus

Robertson, Karen Sue 20 May 2015 (has links)
No description available.
34

Investigating the Influence of Zoo Exhibit Design on Visitor Empathy for Wildlife

Grover, Emily R. 01 June 2018 (has links)
No description available.
35

Den interaktiva djurparken / The interactive zoo

Romlin, Henric, Rudbeck, Gustav, Svendelin, Freddie January 2010 (has links)
The purpose of this thesis project is to develop a set of interactive digital solutions designed to enhance the interest and knowledge intake of visitors at Skånes Djurpark (Zoo of Scania) in Höör. The project was carried out in collaboration with Skånes Djurpark and representatives from its visitors. Our thesis is based on academic works in the fields of interaction design, exhibit design and contextual learning. Ethnographical field studies have been conducted at Skånes Djurpark with additional field studies at Tropikariet in Helsingborg, Copenhagen Zoo and Regionmuseet Kristianstad. Existing information signs in Skånes Djurpark are primarily image- and textbased, forcing visitors to divert their attention from the different species of Nordic animals that inhabit the zoological park. Our proposed set of designs include interactive signage solutions using audiomedia, which allows visitors to learn by listening to stories while experiencing and physically looking at living animals.
36

Įrodymų leistinumas civiliniame procese / Reliability of evidences in civil procedure

Jurgelionytė, Jurgita 15 December 2006 (has links)
Įrodymų leistinumas yra vienas aktualiausių įrodymų savybių klausimų, kuris šiuolaikiniame teis÷s moksle n÷ra sistemiškai ir pakankamai atskleistas. Nebuvimas tikslios ir vienareikšm÷s įrodymų leistinumo definicijos – daro šį klausimą dar aktualesniu. Tad šis magistro baigiamasis darbas yra skirtas įrodymų leistinumo problemos nagrin÷jimui, naujai apibr÷žiant įrodymų leistinumo turinį, pateikiant jo sąvoką ir reikšmę civilinio proceso mokslui. Apibr÷žiant įrodymų leistinumą bus aptarta bendroji įrodymų leistinumo taisykl÷, į kurią bus pažvelgta keliais aspektais. Kadangi kiekviena įrodin÷jimo priemon÷ turi savo specifiką, ypatingas d÷mesys bus skiriamas atskirų įrodin÷jimo priemonių leistinumo ypatumams. Atkreiptinas d÷meys bus į problematiškus leistinumo klausimus, tame tarpe ir į klausimus, susijusius su leistinų elektroninių duomenų naudojimu civiliniame procese. Tad šio magistro baigiamojo darbo tiklsas yra apibendrintai pateikti teorinius ir praktinius įrodymų leistinumo civiliniame procese aspektus. / The reliability of evidences is one of the most actual aspects of evidences which are not enough analyzed in science of law. The fact that there is no clear meaning of reliability of evidences makes the problem even more actual. The purpose is to analyze the problem of the reliability of evidences and to clarify a definition and conception of reliability of evidences. Analyzing and defining the aspects of reliability of evidences the author pays attention to the common rule of reliability of evidences in few ways. The author also pays attention to the peculiarity of the particular kinds of evidences which every have it’s own specifics. Analyzing some aspects of the reliability author pays attention to actual problems, for example, the legal use of electronic data as evidences in civil procedure. The purpose of this scientific work is to show and analyze the conception, meaning and actual problems of the reliability of evidences as well as to suggest possible ways for resolving actual problems and gaps in both theoretical and practical levels.
37

Architecture with pallets: a use cycle extension of daily product.

January 2010 (has links)
Tsang Wai Ying, Martha. / "Architecture Department, Chinese University of Hong Kong, Master of Architecture Programme 2009-2010, design report." / "May 2010." / Chapter CHAPETER 0 --- BACKGROUND / Chapter - --- Interest of studies / Chapter - --- Lifecycle + Lifespan / Chapter CHAPETER 1 --- THESIS STATEMENT / Chapter CHAPETER 2 --- PRECEDENT STUDIES - THE PRODUCTS' CYCLE / Chapter - --- Material transformation / Chapter - --- Artist artworks with daily product / Chapter - --- Recycle Architecture / Chapter CHAPETER 3 --- IN SEARCH OF - DAILY PRODUCTS FOR ARCHITECTURE / Chapter - --- Dally product research / Chapter - --- Containers + Pallets / Chapter CHAPETER 4 --- PALLETS / Chapter - --- Pallets system / Chapter - --- Geometry study / Chapter CHAPTER 5 --- DESIGN / Chapter - --- programme / Chapter - --- short lifespan extension through repetitve use / Chapter - --- long lifespan extension through modification / Chapter CHAPTER 6 --- CONSTRUCTION / Chapter - --- pallets as tool for construction / Chapter - --- connection / Chapter - --- cost / Chapter CHAPTER 7 --- SPECIAL STUDIES - ENVELOPE AS LAYERS OF PROTECTION
38

From the Shadow into the Spotlight:The Memory and Resilience of the Korean War

Kaminski, Avery John 26 August 2019 (has links)
No description available.
39

The Waltz on the Seine

Kang, Jennifer J. 10 November 2000 (has links)
The desire to recognize and celebrate a forgotten artist and her work presents an opportunity for an investigation into the meeting of art and architecture. The dialogue between these two entities highlights the complexity of exhibiting works of art within a space of architectural integrity. The challenge is to successfully address both the art and the architecture in order to achieve a relationship that is mutually beneficial and equally powerful. This thesis investigates the transcendent themes created in such a dialogue. An innovative approach creates opportunities for extraordinary spatial experiences of the architecture and the artwork itself while addressing the challenges proposed by the site, one that has tremendous historical and cultural significance. The ultimate goal is a place where the architectural conditions provide a canvas for the acknowledgment and celebration of the artistic endeavors. / Master of Architecture
40

Communicating science : developing an exhibit with scientists and educators

Lemagie, Emily 28 October 2011 (has links)
Outreach is a small, but significant component to modern research. Developing an exhibit for public display can be an effective way to communicate science to broad audiences, although it may be a less familiar method to scientists than writing papers or giving presentations. I outline the process of developing an interactive exhibit for outreach, and evaluate and discuss the effectiveness of a computer exhibit designed to communicate estuary currents and scientific modeling using Olympia Oyster restoration in the Yaquina Bay estuary as a theme. I summarize the results of this project in three primary recommendations: 1) exhibit developers should be deliberate in the decision to use a computer and only select this media if it is determined to be the best for communicating exhibit learning outcomes, 2) the design of visualizations to convey research results should be carefully modified from their scientific forms to best meet the exhibit learning outcomes and expectations of the exhibit audience, and 3) scientists should play an integral role in the development of scientific content-based exhibits, but their expertise, and the range of expertise from other members of the exhibit development team, should be strategically utilized. / Graduation date: 2012

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