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Background: Musculoskeletal pain and disorders represents one of the greatest problems of dental professionals. The present study aimed to make an assessment of the work-related musculoskeletal pain (WRMP) of the neck, shoulders and back of the professors at the Dental Hospital of the University of Barcelona (DHUB) during the last 12 months. Methods: A cross-sectional study was performed. WRMP were assessed using validated questionnaires. Descriptive and bivariate analysis of the data were performed. Results: 165 teachers received the survey, 70 responded and 43 fulfilled the inclusion criteria. 86.05% of respondents reported WRMP during the last 12 months, with shoulders being the most common location. 83.78% of the dentists had gradual pain of moderate intensity. Nearly one-third of these periods of pain had negative consequences. Extreme cervical torsions and flexions during work have been found to be associated with WRMP in the shoulders. In addition, Body Mass Index (BMI) was related to lower back WRMP. Conclusions: Excessive cervical twists and flexions are predictors of shoulders’. A high BMI can be considered a trigger factor of lower back WRMP. Several strategies could reduce the impact of factors associated with WRMP. Further research is needed to prevent WRMP in dentists.

In the field of implant dentistry there are several mechanisms by which metal particles can be released into the peri-implant tissues, such as implant insertion, corrosion, wear, or surface decontamination techniques. The aim of this study was to evaluate the corrosion behavior of Ti6Al4V particles released during implantoplasty of dental implants treated due to periimplantitis. A standardized protocol was used to obtain metal particles produced during polishing the surface of Ti6Al4V dental implants. Physicochemical and biological characterization of the particles were described in Part I, while the mechanical properties and corrosion behavior have been studied in this study. Mechanical properties were determined by means of nanoindentation and X-ray diffraction. Corrosion resistance was evaluated by electrochemical testing in an artificial saliva medium. Corrosion parameters such as critical current density (icr), corrosion potential (E(CORR)), and passive current density (i(CORR)) have been determined. The samples for electrochemical behavior were discs of Ti6Al4V as-received and discs with the same mechanical properties and internal stresses than the particles from implantoplasty. The discs were cold-worked at 12.5% in order to achieve the same properties (hardness, strength, plastic strain, and residual stresses). The implantoplasty particles showed a higher hardness, strength, elastic modulus, and lower strain to fracture and a compressive residual stress. Resistance to corrosion of the implantoplasty particles decreased, and surface pitting was observed. This fact is due to the increase of the residual stress on the surfaces which favor the electrochemical reactions. The values of corrosion potential can be achieved in normal conditions and produce corroded debris which could be cytotoxic and cause tattooing in the soft tissues.

Submitted by AWDREN FONT??O (awdren@icomp.ufam.edu.br) on 2019-07-16T14:51:04Z No. of bitstreams: 4 Tese_DevGo_AwdrenFontao.pdf: 8475555 bytes, checksum: bb42e1cf4425c080952b9a81d61f1bcb (MD5) Carta de Autorizac??a??o de Encaminhamento-2 (1).pdf: 121606 bytes, checksum: 02404d426bcac30df1c6c7e6ba3198b1 (MD5) 50 ATA de Defesa - Awdren Fonta??o (Assinada).pdf: 524707 bytes, checksum: 789b50637c1d1b19601ab33e9ab74136 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Approved for entry into archive by Secretaria PPGI (secretariappgi@icomp.ufam.edu.br) on 2019-07-16T15:00:54Z (GMT) No. of bitstreams: 4 Tese_DevGo_AwdrenFontao.pdf: 8475555 bytes, checksum: bb42e1cf4425c080952b9a81d61f1bcb (MD5) Carta de Autorizac??a??o de Encaminhamento-2 (1).pdf: 121606 bytes, checksum: 02404d426bcac30df1c6c7e6ba3198b1 (MD5) 50 ATA de Defesa - Awdren Fonta??o (Assinada).pdf: 524707 bytes, checksum: 789b50637c1d1b19601ab33e9ab74136 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Approved for entry into archive by Divis??o de Documenta????o/BC Biblioteca Central (ddbc@ufam.edu.br) on 2019-07-18T14:35:22Z (GMT) No. of bitstreams: 4 Tese_DevGo_AwdrenFontao.pdf: 8475555 bytes, checksum: bb42e1cf4425c080952b9a81d61f1bcb (MD5) Carta de Autorizac??a??o de Encaminhamento-2 (1).pdf: 121606 bytes, checksum: 02404d426bcac30df1c6c7e6ba3198b1 (MD5) 50 ATA de Defesa - Awdren Fonta??o (Assinada).pdf: 524707 bytes, checksum: 789b50637c1d1b19601ab33e9ab74136 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Made available in DSpace on 2019-07-18T14:35:22Z (GMT). No. of bitstreams: 4 Tese_DevGo_AwdrenFontao.pdf: 8475555 bytes, checksum: bb42e1cf4425c080952b9a81d61f1bcb (MD5) Carta de Autorizac??a??o de Encaminhamento-2 (1).pdf: 121606 bytes, checksum: 02404d426bcac30df1c6c7e6ba3198b1 (MD5) 50 ATA de Defesa - Awdren Fonta??o (Assinada).pdf: 524707 bytes, checksum: 789b50637c1d1b19601ab33e9ab74136 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2019-06-14 CAPES - Coordena????o de Aperfei??oamento de Pessoal de N??vel Superior 92984114246 Organizations that maintain mobile software ecosystems (MSECO), such as Apple, Google and Microsoft, have engaged a critical mass of outside developers to expand their platforms. As such, they explore strategies for developer governance. These strategies depend on the associated operation between the organization's goals and the expectations of the developers. The MSECO developer governance area still needs formalization, theories and models. In this context, organizations have invested in Developer Relations (DevRel).The industry requires new strategies that promote the organization's collaboration with external developers. As part of these strategies, DevRel professionals need to have a realistic view of developers' behavior within the ecosystem and then meet the developers??? needs and achieve organizations??? goals. The definition of developer governance strategies is not trivial; it consists of delimiting the actions of developers without restricting excessively the desired level of value creation. If developer governance is unsustainable, it can lead to the "death" of the ecosystem. For example, one of the factors by which the Windows Phone MSECO was officially declared "dead" in 2017 was because the developers no longer supported the platform. In this thesis, through a set of secondary and primary studies and mining software repositories involving DevRel professionals, we investigate the structure of MSECO developer governance and a set of lessons learned. Next, we built and refined a model for governance of developers in MSECO called DevGo (DEVeloper GOVernance). DevGo consists of: areas of focus, developer advancement stages, stages, facilitators, and value transfer objects. In addition, a set of lessons learned from DevRel professionals associated with DevGo stages, repository categories, and motivations for their use with a focus on monitoring. From the case studies, participants noted that the DevGo framework facilitates understanding of developer governance, value transfer objects, as well as the communication of the importance of the field to the organization and the focus area regarding ecosystem monitoring. There was no disagreement regarding the adequacy, control, understanding and generality of DevGo. Organiza????es que mant??m ecossistemas de software m??vel (MSECO), como Apple, Google e Microsoft, t??m engajado uma massa cr??tica de desenvolvedores externos para expandir suas plataformas. Nesse sentido, elas exploram estrat??gias de governan??a de desenvolvedores. Estas estrat??gias dependem da opera????o associada entre os objetivos da organiza????o e as expectativas dos desenvolvedores. A ??rea de governan??a de desenvolvedores em MSECO ainda necessita de formaliza????o, de teorias e modelos. Desta forma, as organiza????es t??m investido em Rela????es com Desenvolvedores (DevRel, do ingl??s Developer Relations). A ind??stria exige novas estrat??gias que promovam a colabora????o da organiza????o com os desenvolvedores externos. Como parte dessas estrat??gias, os profissionais de DevRel precisam ter uma vis??o realista do comportamento dos desenvolvedores dentro do ecossistema. Assim ?? poss??vel atender ??s necessidades dos desenvolvedores e atingir metas da organiza????o. A defini????o de estrat??gias de governan??a de desenvolvedores n??o ?? trivial, consiste em delimitar as a????es dos desenvolvedores sem restringir excessivamente o n??vel desejado de cria????o de valor. Se a governan??a de desenvolvedores for insustent??vel, pode-se incorrer na ???morte??? do ecossistema. Por exemplo, um dos fatores pelos quais o MSECO Windows Phone foi declarado oficialmente ???morto??? em 2017 foi porque os desenvolvedores n??o apoiaram mais a plataforma. Nesta tese, por meio de um conjunto de estudos secund??rios, prim??rios e de minera????o de reposit??rios de software envolvendo 68 profissionais de DevRel, ?? investigada qual a estrutura da governan??a de desenvolvedores em MSECO e um conjunto de li????es aprendidas. Com isto, foi constru??do e refinado um modelo para governan??a de desenvolvedores em MSECO chamado DevGo (do ingl??s, DEVeloper GOVernance). O DevGo ?? composto por: ??reas de foco, fases de avan??o do desenvolvedor, est??gios, facilitadores e objetos de transfer??ncia de valor. Al??m disso, um conjunto de li????es aprendidas de profissionais de DevRel associadas a est??gios do DEVGO, categorias de reposit??rios e motiva????es para uso deles com foco em monitoramento. A partir de estudos de caso, os participantes, destacara que a estrutura do DevGo facilita o entendimento da governan??a de desenvolvedores, dos objetos de transfer??ncia de valor, inclusive, para comunicar a import??ncia da ??rea para a organiza????o e a ??rea de foco de monitoramento. N??o houve discord??ncia em rela????o ?? adequa????o, ao controle, ao entendimento e ?? generalidade do DevGo.

Submitted by In??s Marinho (bele_ballet@hotmail.com) on 2016-06-20T15:13:44Z No. of bitstreams: 1 Disserta????o - Awdren de Lima Font??o.pdf: 3467255 bytes, checksum: c628b86f0b320e89d4659daa37a0c5fd (MD5) Approved for entry into archive by Divis??o de Documenta????o/BC Biblioteca Central (ddbc@ufam.edu.br) on 2016-06-23T18:13:40Z (GMT) No. of bitstreams: 1 Disserta????o - Awdren de Lima Font??o.pdf: 3467255 bytes, checksum: c628b86f0b320e89d4659daa37a0c5fd (MD5) Approved for entry into archive by Divis??o de Documenta????o/BC Biblioteca Central (ddbc@ufam.edu.br) on 2016-06-23T18:16:12Z (GMT) No. of bitstreams: 1 Disserta????o - Awdren de Lima Font??o.pdf: 3467255 bytes, checksum: c628b86f0b320e89d4659daa37a0c5fd (MD5) Made available in DSpace on 2016-06-23T18:16:12Z (GMT). No. of bitstreams: 1 Disserta????o - Awdren de Lima Font??o.pdf: 3467255 bytes, checksum: c628b86f0b320e89d4659daa37a0c5fd (MD5) Previous issue date: 2016-03-02 In a Mobile Software Ecosystem (MSECO), the software organizations have opened up their structures to external developers aiming to reach goals to ensure the MSECO is working properly, such as increasing number of users, mobile applications (apps) and developers. Thus, the management organization (keystone) must restructure its processes to support external developers and create ways to attract the development of apps. The development of apps requires an approach that allows developers to achieve the expected performance into the MSECO. However, there is a quality contribution barrier, the App Store, the App Store???s criteria do not guarantee that apps certified by these criteria have good performance in number of downloads and positive reviews into the MSECO. It is necessary to consider the developer engagement, the quality of support offered by the organization to developers by the evangelists and the existing processes into the MSECO. In this work, we describe a collaborative approach to support app certification in MSEO defined by pair reviews and surveys. This approach is called MSECO-CERT that is composed by three process (Orchestration ??? MSECO-ORQ, Support ??? MSECO-SUP and Construction ??? MSECO-DEV), including recommendations and practices to impact positively the MSECO???s health. The MSECO-CERT was evaluated with feasibility study and observational study. Em um Ecossistema de Software M??vel (MSECO), as organiza????es de software passaram a abrir a sua estrutura para desenvolvedores externos visando atingir metas que garantam o funcionamento do MSECO, tais como o aumento do n??mero de usu??rios, aplica????es m??veis (apps) e desenvolvedores. Desta forma, a organiza????o central (keystone, em ingl??s) precisa reestruturar seus processos para lidar com os desenvolvedores externos e criar meios para motivar o desenvolvimento de apps. Neste contexto, o desenvolvimento de aplica????es m??veis requer uma abordagem que permita aos desenvolvedores alcan??ar o desempenho esperado dentro de um MSECO. Por??m, h?? uma ???barreira??? de qualidade, a Loja de Apps. Os crit??rios de qualidade das lojas n??o garantem que as apps certificadas a partir deles obtenham o desempenho desejado em rela????o a n??mero de downloads e avalia????es positivas dentro do MSECO. ?? necess??rio considerar o engajamento do desenvolvedor, a qualidade de suporte oferecido pela organiza????o aos desenvolvedores por meio dos evangelistas e os processos dentro do MSECO. Assim, acredita-se que trabalhando na qualidade dos processos envolvidos no MSECO pode-se chegar ?? qualidade do produto, neste caso, a app. Neste trabalho, foi definida uma abordagem para certifica????o de apps no contexto de MSECO, chamada de MSECO-CERT. Ela ?? composta por tr??s processos (Orquestra????o ??? MSECO-ORQ, Suporte ??? MSECO-SUP e Constru????o ??? MSECO-DEV), recomenda????es e pr??ticas relacionadas ?? fase de pr??-publica????o, ou seja, antes da app ser submetida pelo desenvolvedor ?? Loja de Apps. A MSECO-CERT foi avaliada por meio de estudo de viabilidade e um estudo de observa????o.

Made available in DSpace on 2015-04-22T22:07:29Z (GMT). No. of bitstreams: 1 SALOME_ FONTAO_CUNHA.pdf: 1002004 bytes, checksum: d7451d75aca7e8b7ef22bdbdd99db48c (MD5) Previous issue date: 2005-07-29 Conselho Nacional de Desenvolvimento Cient??fico e Tecnol??gico Estudamos o transporte de buracos em dupla barreira ressonante submetida a stress uniaxial, usando a t??cnica da matriz de espalhamento na aproxima????o de massa efetiva do modelo de Luttinger-Kohn-Pikus. A transmissividade ?? calculada para k = 0 e k ??? 0 para o sistema GaAs /AlAs para os esfor??os de compress??o (T < 0) e tra????o (T > 0). Para k = 0, os buracos leves e pesados s??o desacoplados e observa-se um deslocamento r??gido nas curvas de transmissividades e invers??o do estado fundamental, HH1 LH1 para o esfor??o de tra????o. No caso k ??? 0, al??m da mistura das bandas que aumenta a probabilidade de transmiss??o, o stress muda o car??ter das part??cula HH LH, a separa????o relativa entre os estados HH e LH no po??o qu??ntico, e indiretamente, influ??ncia na mistura dos estados de val??ncia, aumentando ou diminuindo as transmissividades dos buracos dependendo do tipo de esfor??o aplicado.