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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

Functional Dendritic Materials using Click Chemistry : Synthesis, Characterizations and Applications

Antoni, Per January 2008 (has links)
Förfrågan efter nya och mer avancerade applikationer är en pågående process vilket leder till en konstant utveckling av nya material. För att förstå relationen mellan en applikations egenskaper och dess sammansättning krävs full förståelse och kontroll över materialets uppbyggnad. En sådan kontroll över uppbyggnaden hos material hittas i en undergrupp till dendritiska polymerer som kallas dendrimerer. I den här doktorsavhandlingen belyses nya metoder för att framställa dendrimer med hjälp av selektiva kemiska reaktioner. Sådana selektiva reaktioner kan hittas inom konceptet klickkemi och har i detta arbete kombinerats med traditionell anhydrid- och karbodiimidmedierad kemi. Denna avhandling diskuterar en accelererad tillväxtmetod, dendrimerer med inre och yttre reaktiva grupper, simultana reaktioner och applikationer baserade på dessa dendritiska material. En accelererad tillväxtmetod har utvecklats baserad på AB2- och CD2-monomerer. Dessa monomerer tillåter tillväxt av dendrimerer utan att använda sig av skyddsgruppkemi eller aktivering av ändgrupper. Detta gjordes genom att kombinera kemoselektiviteten hos klickkemi tillsammans med traditionell syraklorid kopplingar. Dendrimerer med inre alkyn- eller azidfunktionalitet syntetiserades genom att använda AB2C-monomerer. Den dendritiska tillväxten skedde med hjälp av karbodiimidmedierad kemi. Monomererna som användes bär på en C-funktionalitet, alkyn eller azid, och på så sätt byggs får interiören i de syntetiserade dendrimeren en inneburen aktiv funktionell grupp. Ortogonaliteten hos klickkemi användes för att sammanfoga monomerer till en dendritisk struktur. Traditionell anhydridkemi- och klickemireaktioner utfördes samtidigt och på så sätt kunde dendritiska strukturer erhållas med färre antal uppreningssteg. En ljusemitterande dendrimer syntetiserades genom att koppla azidfunktionella dendroner till en alkynfunktionell cyclenkärna. Europiumjoner inkorporerades i kärnan varpå dendrimerens fotofysiska egenskaper analyserades. Mätningarna visade att den bildade triazolen hade en sensibiliserande effekt på europiumjonen. Termiska studier på några av de syntetiserade dendrimerer utfördes för att se om några av dem kunde fungera som templat vid framställning av isoporösa filmer. / The need for new improved materials in cutting edge applications is constantly inspiring researchers to developing novel advanced macromolecular structures. A research area within advanced and complex macromolecular structures is dendrimers and their synthesis. Dendrimers consist of highly dense and branched structures that have promising properties suitable for biomedical and electrical applications and as templating materials. Dendrimers provide full control over the structure and property relationship since they are synthesized with unprecedented control over each reaction step. In this doctoral thesis, new methodologies for dendrimer synthesis are based on the concept of click chemistry in combination with traditional chemical reactions for dendrimer synthesis. This thesis discusses an accelerated growth approach, dendrimers with internal functionality, concurrent reactions and their applications. An accelerated growth approach for dendrimers was developed based on AB2- and CD2-monomers. These allow dendritic growth without the use of activation or deprotection of the peripheral end-groups. This was achieved by combining the chemoselective nature of click chemistry and traditional acid chloride reactions. Dendrimers with internal azide/alkyne functionality were prepared by adding AB2C monomers to a multifunctional core. Dendritic growth was obtained by employing carbodiimide mediated chemistry. The monomers carry a pendant C-functionality (alkyne or azide) that remains available in the dendritic interior resulting in dendrimers with internal and peripheral functionalities. The orthogonal nature of click chemistry was utilized for the simultaneous assembly of monomers into dendritic structures. Traditional anhydride chemistry and click chemistry were carried out concurrently to obtain dendritic structures. This procedure allows synthesis of dendritic structures using fewer purification steps. Thermal analyses on selected dendrimers were carried out to verify their use as templates for the formation of honeycomb membranes. Additionally, a light emitting dendrimer was prepared by coupling of azide functional dendrons to an alkyne functional cyclen core. A Europium ion was incorporated into the dendrimer core, and photophysical measurements on the metal containing dendrimer revealed that the formed triazole linkage possesses a sensitizing effect. / QC 20100629
32

Ab initio studies of equations of state and chemical reactions of reactive structural materials

Zaharieva, Roussislava 07 December 2011 (has links)
The motivations for the research issues addressed in this thesis are based on the needs of the aerospace structural analysis and the design community. The specific focus is related to the characterization and shock induced chemical reactions of multi-functional structural-energetic materials that are also know as the reactive structural materials and their reaction capabilities. Usually motivation for selection of aerospace structural materials is to realize required strength characteristics and favorable strength to weight ratios. The term strength implies resistance to loads experienced during the service life of the structure, including resistance to fatigue loads, corrosion and other extreme conditions. Thus, basically the structural materials are single function materials that resist loads experienced during the service life of the structure. However, it is desirable to select materials that are capable of offering more than one basic function of strength. Very often, the second function is the capability to provide functions of sensing and actuation. In this thesis, the second function is different. The second function is the energetic characteristics. Thus, the choice of dual functions of the material are the structural characteristics and energetic characteristics. These materials are also known by other names such as the reactive material structures or dual functional structural energetic materials. Specifically the selected reactive materials include mixtures of selected metals and metal oxides that are also known as thermite mixtures, reacting intermetallic combinations and oxidizing materials. There are several techniques that are available to synthesize these structural energetic materials or reactive material structures and new synthesis techniques constitute an open research area. The focus of this thesis, however, is the characterization of chemical reactions of reactive material structures that involve two or more solids (or condensed matter). The subject of studies of the shock or thermally induced chemical reactions of the two solids comprising these reactive materials, from first principles, is a relatively new field of study. The published literature on ab initio principles or quantum mechanics based approach contains the ab initio or ab initio-molecular dynamics studies in related fields of a solid and a gas. One such study in the literature involves a gas and a solid. This is an investigation of the adsorption of gasses such as carbon monoxide (CO) on Tungsten. The motivation for these studies is to synthesize alternate or synthetic fuel technology by Fischer-Tropsch process. In this thesis these studies are first to establish the procedure for solid-solid reaction and then to extend that to consider the effects of mechanical strain and temperature on the binding energy and chemisorptions of CO on tungsten. Then in this thesis, similar studies are also conducted on the effect of mechanical strain and temperature on the binding energies of Titanium and hydrogen. The motivations are again to understand the method and extend the method to such solid-solid reactions. A second motivation is to seek strained conditions that favor hydrogen storage and strain conditions that release hydrogen easily when needed. Following the establishment of ab initio and ab initio studies of chemical reactions between a solid and a gas, the next step of research is to study thermally induced chemical reaction between two solids (Ni+Al). Thus, specific new studies of the thesis are as follows: 1. Ab initio Studies of Binding energies associated with chemisorption of (a) CO on W surfaces (111, and 100) at elevated temperatures and strains and (b) adsorption of hydrogen in titanium base. 2. Equations of state of mixtures of reactive material structures from ab initio methods 3. Ab initio studies of the reaction initiation, transition states and reaction products of intermetallic mixtures of (Ni+Al) at elevated temperatures and strains. 4. Press-cure synthesis of Nano-nickel and nano-aluminum based reactive material structures and DTA tests to study experimentally initiation of chemical reactions, due to thermal energy input.
33

Island Tourism Management Process: Implications for Optimisation

Mr Chul-soo Lim Unknown Date (has links)
No description available.
34

Salas de Recursos Multifuncionais: um estudo sobre a formação e a atuação de professores / Multi-functional resources: a study on the formation and operation of teachers

Camargo, Miriam Rosa Torres de 25 February 2014 (has links)
Submitted by Maria de Lourdes Mariano (lmariano@ufscar.br) on 2017-01-18T18:08:50Z No. of bitstreams: 1 CAMARGO_Miriam Rosa_2014.pdf: 3429547 bytes, checksum: f634212d3f59b6103179777c29cf6884 (MD5) / Approved for entry into archive by Maria de Lourdes Mariano (lmariano@ufscar.br) on 2017-01-18T18:08:59Z (GMT) No. of bitstreams: 1 CAMARGO_Miriam Rosa_2014.pdf: 3429547 bytes, checksum: f634212d3f59b6103179777c29cf6884 (MD5) / Approved for entry into archive by Maria de Lourdes Mariano (lmariano@ufscar.br) on 2017-01-18T18:09:07Z (GMT) No. of bitstreams: 1 CAMARGO_Miriam Rosa_2014.pdf: 3429547 bytes, checksum: f634212d3f59b6103179777c29cf6884 (MD5) / Made available in DSpace on 2017-01-18T18:09:14Z (GMT). No. of bitstreams: 1 CAMARGO_Miriam Rosa_2014.pdf: 3429547 bytes, checksum: f634212d3f59b6103179777c29cf6884 (MD5) Previous issue date: 2014-02-25 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / The present study aimed to investigate aspects of the formation and action of teachers, working with pupils with special educational needs, in inclusive perspective, in multifunctional resource rooms, specifically in the city of Sorocaba- SP. The specific objectives included: the possibilities and challenges perceived by teachers working in SEM; investigation as to how the educators felt and acted in the face of difficulties encountered in educational practice; and evaluation, according to the existing continuing education, offered by the Department of Education through the Center for Excellence in Education - Don Jose Lambertt. Four teachers, working in multifunctional features, participated in this study. The procedures used were: semistructured interviews, participant observation, records from field diaries and document research. The results were analysed based on four axes: the profile of teachers of specialized educational services (AEE), subsequent to their initial training offered by Pedagogy courses; the challenges and possibilities facing teachers within Specialized Educational Services (ESA), in the Multi-Functional Room Appeal (SRM); the articulation between the meaning of skilled labor and teaching practices; and the perceptions of on-going education promoted by the Department of Education (SEDU) / Reference Center for Education (CRE). These axes have some major aspects, some of which have been highlighted: the importance of continuing education, according to the teachers interviewed; and the contribution and limitations of this proposal in terms of their teaching practices, in the use of multi-functional rooms. In conclusion, despite the weaknesses of continuing educational programs for teachers of SRMs, there have still been major advances and the participants themselves recognize how these formations can influence the way we act towards the obstacles encountered in the daily lives of SRMs. / A presente pesquisa visou investigar aspectos da formação e a atuação de professores que trabalham com alunos com necessidades educativas especiais, na perspectiva inclusiva, em Salas de Recursos Multifuncionais, especificamente, na cidade de Sorocaba-SP. Os objetivos específicos abrangeram: investigar as percepções dos professores em relação às possibilidades e aos desafios do trabalho na SRM; conhecer como os educadores se sentiam e atuavam diante das dificuldades encontradas na prática educativa e como avaliavam a formação continuada existente no município, oferecida pela Secretaria da Educação por meio do Centro de Referência em EducaçãoDom José Lambertt. Participaram desta pesquisa quatro professoras que atuavam em salas de recursos multifuncionais. Como procedimentos foram utilizados: entrevista semiestruturada, observação participante e registros em diários de campo, além de consulta documental. Os resultados foram analisados a partir de quatro eixos: perfil das professoras do Atendimento Educacional Especializado (AEE) quanto a sua formação inicial; desafios e possibilidades que a professora do Atendimento Educacional Especializado (AEE) enfrenta na Sala Recurso Multifuncional (SRM); articulação entre o sentido do trabalho especializado e as práticas docentes; percepções sobre a formação continuada em serviço promovida pela Secretaria da Educação (SEDU)/Centro de Referência em Educação (CRE). Nesses eixos, foram destacados alguns aspectos principais, a saber: a importância da formação continuada, segundo o relato das professoras entrevistadas e as contribuições e limites desta proposta em relação as suas práticas docentes na sala de recurso multifuncional. Concluímos que, apesar das fragilidades dos programas de formação continuada, para as professoras das SRMs representou um grande avanço e que as próprias participantes reconhecem o quanto estas formações podem influenciar na forma de agir perante os obstáculos encontrados no cotidiano das SRMs.
35

City building

Pienaar, Rousseau 21 February 2005 (has links)
NDLTD Innovative ETD Award 2005. The design of a multi-functional building entails the synthesis of multiple systems and networks. The needs of multiple clients must be effectively overlaid to create a build able, contextually suitable and aesthetically pleasing architectural solution. The proposed building is a public, urban building. City buildings consist of spaces that are essentially part of the city, simultaneously dependant on the whole and separated by building lines and security systems. The gradation of space from public to private exists everywhere. The focus of the design is on the creation of place in the Pretoria CBD. The scheme is integrated into its surroundings, and functions as a system in itself. The proposed multi-use building will be set on a currently built up site in the Pretoria CBD, on the c/o Paul Kruger and Schoeman Streets, one city block from Church Square. Building functions include retail, residential, a satellite gallery for the Tshwane Art Museum, and new offices and facilities for Talking Beads, a producer Arts and Crafts. / Dissertation (MArch (Prof))--University of Pretoria, 2006. / Architecture / unrestricted
36

Polyfunkční dům, Zábřeh na Moravě / Multipurpose facility ,Zábřeh na Moravě

Appelová, Sandra January 2013 (has links)
The project handles the complete project documentation multi-functional building at the level of the building construction. The proposal places emphasis on layout and design to ensure the site is static, noise and shake protection, energy saving and safety in use. Processed by computer-CAD
37

BIKEZONE.cz - Cykloprodejna s bytovými jednotkami / BIKEZONE.cz - A bike shop with apartments

Černín, Jiří January 2013 (has links)
A freestanding multi-functional building in Opava. Basement of the object designed for parking cars of the residents. First and second floor designed as a bike shop. Third, fourth and fifth floor designed as flats of different types and sizes, determined for permanent housing. The object is covered by single-layer roof.
38

Polyfunkční dům v Čáslavi / Multifunctional Building in Čáslav

Merenus, Vojtěch January 2013 (has links)
The purpose of the diploma thesis is to design a multi-functional bulding, which fill an empty space on the corner of two streets near the historical city centre of Čáslav. This building has mainly a residential function. Basement will be used for parking and as a place for technical room. Commercial use is forseen for the first floor. Other floors will be set by 18 flats. The main goal is to solve a disposition for given purpose, to choose a right type of structure and work up chosen part of project documentation for building permission. Blueprints will be made in a proper CAD program.
39

Dům krátké cesty v Brně / 5-Minutes Neighbourhood

Holešovská, Anna January 2014 (has links)
The aim of this Master thesis was to create urban structure in the particular resident area of Brno that would revitalizing and activating that particular and at the same time keep on the original estate. The main target is also to design various facilities that would enhance current environment and provide new opportunities.
40

Polyfunkční dům / Multifunctional Building

Šimánková, Markéta January 2015 (has links)
The topic of the master's thesis is the design new multi-functional building. The aim is to develop detailed documentation for construction. The work includes studies, drawings, text and part of the calculation. The building is located in undeveloped land in sloping terrain. It is detached building with four floor above the ground and one underground floor. The building has commercial premises and eleven flats, one of which is accessible flat. There are also seven separate garages on the underground floor. The basisc are made from contrete strips. The house is made by a brick technology of a ceramic blocks. The external walls are insulated with certified contact thermal insulation system. The building is roofed with warm flat roof.

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