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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.
1

Sustentabilidade em organizações econômicas camponesas (oecas) das terras altas da Bolívia: um estudo de casos múltiplos

Guzmán, Ivonne Paola Requena January 2009 (has links)
231 p. / Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2013-01-07T18:49:25Z No. of bitstreams: 1 66.pdf: 8853933 bytes, checksum: af379f03d9111a209ed4eda327dcc697 (MD5) / Made available in DSpace on 2013-01-07T18:49:25Z (GMT). No. of bitstreams: 1 66.pdf: 8853933 bytes, checksum: af379f03d9111a209ed4eda327dcc697 (MD5) Previous issue date: 2009 / Esta dissertação promove uma reflexão, no campo da teoria organizacional, acerca da influência dos valores tradicionais da cultura aymara e dos valores do mercado sobre a sustentabilidade em Organizações Econômicas Camponesas (Oecas) das Terras Altas, localizadas na região ocidental da Bolívia. O trabalho se estruturou a partir do conceito de sustentabilidade organizacional delineado por França Filho e Santana Júnior (2007), nos seus esforços de compreensão do fenômeno da economia solidária, e também na abordagem sobre a racionalidade substantiva desenvolvida pelo autor Guerreiro Ramos (1981). Trata-se de uma pesquisa qualitativa, centrada na estratégia de estudo de casos múltiplos, que utiliza como técnicas de coleta de dados entrevistas e observação simples. As Oecas pesquisadas foram Cimat-Apci, Amaq e CPS que centram sua atividade produtiva na transformação de fibra de lã de camelídeos em artesanato. Conclui-se que nessas organizações os atores concebem a sustentabilidade a partir de duas perspectivas igualmente importantes e não excludentes: a aquisição de renda suficiente para satisfazer as suas necessidades de consumo e, ao mesmo tempo, garantir a continuidade do seu estilo de vida que gira em torno dos costumes e tradição aymara, próprios da região. / Salvador
2

Inkjet Printing of Enhancement-mode Organic Electrochemical Transistors

Avila-Ramirez, Alan 31 July 2023 (has links)
Additive manufacturing technologies, including inkjet printing, have significantly transformed both research and industry, offering cost-effective and accessible solutions with innovative equipment capabilities. This study focuses on advancing p-type depletion and enhancement-mode poly(3,4-ethylenedioxythiophene) (PEDOT:PSS) through molecular de-doping and rheological measurements, achieving a printing resolution of 30 μm. The versatility of these inks is demonstrated from three distinct perspectives. Firstly, the electrochemical stability of the enhancement-mode behavior opens new possibilities for low-power consumption, stable and sensitive platforms useful for detection of DopamineC and Ascorbic Acid at various concentrations. Secondly, we exemplify the democratization of in-house fabrication through fully printed, all-PEDOT:PSS, transparent, flexible, and bendable paper-based Organic Electrochemical Transistors (OECTs). This showcases the feasibility of employing inkjet printing to create functional electronic devices with ease. Lastly, we explore optimizations that enable deeper personalization by employing multiple material localizations and adjusting the electrical conductivity of OECTs. This engineering approach has resulted in the design of Organic Electrochemical Complementary Amplifiers (OECAs), we incorporated a second formulated enhancement-mode conducting polymer poly(benzimidazobenzophenanthroline) (BBL) as the n-type material to complement the PEDOT:PSS de-doped ink. These developments aim to foster global innovation, representing a significant leap forward in the field of organic electronics and in-house fabrication by complementing this engineering improvement from both fabrication and electrochemistry approaches.

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