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Made available in DSpace on 2019-03-29T00:33:58Z (GMT). No. of bitstreams: 1 geneticdiversitynativegenipaamericana.pdf: 276785 bytes, checksum: 2084478b49abdc372dee0fb5db61b72e (MD5) Previous issue date: 2019

Cranes play an important role at construction sites, transporting heavy loads and large volumes efficiently. The use of the crane, besides reducing manual labor and requiring a more skilled workforce, enables the introduction of new building techniques only possible with the use of this equipment. International studies have shown that the planning process for this equipment is complex, involving multiple stakeholders, and is influenced by two types of factors: hard factors, such as the technical characteristics of the equipment (physical dimensions of the site and required load capacity) and soft factors, which include qualitative specifications of an informal nature (safety characteristics of the company, purchasing/rental policies, and environmental constraints). In this context, understanding the planning process (selection and location) of tower cranes used at vertical building sites is of paramount importance in order to improve management systems for this equipment. Therefore, the objective of this work is to conduct a study of the use of tower cranes at vertical construction sites in the Recife Metropolitan Area (RMR) in order to determine the current state of practice for selecting and using this equipment. The study was conducted at ten vertical building sites (eight in Recife and two in Jaboatão - PE) belonging to eight different construction companies. The survey form was developed based on previous studies of cranes in the USA and Israel, was improved through application at 18 Portuguese building projects, and adapted to the reality of Brazilian buildings through a pilot project at two construction sites in Recife. The forms were filled out during personal visits and semi-structured interviews, lasting an average of four hours. Two worksite supervisors, one mechanical engineer, and ten civil engineers residing at the analyzed sites were interviewed. In order to increase the reliability of the research, complementary data from multiple sources was used to augment the interviews, such as construction documentation, direct observation of crane operation, and photographic records. Data analysis was performed using Excel spreadsheets and this indicated the existence of cultural factors in the selection and location of equipment, such as a preference for the use of internally climbing cranes located in the structural core of the building or running through openings in the floor slabs. According to the interviewees, the selection, planning, and location of cranes happen solely during the preparation and planning phases (preconstruction) of the construction project, with the construction supervisor and the resident engineer being the key stakeholders involved in this process. The study presents limitations regarding the generalization of results depending on the sample type adopted. Therefore, it is recommended to increase the number of construction sites analyzed and develop a multi-criteria decision support model that can assist the process of selection and location of cranes in the RMR., As gruas desempenham um importante papel dentro do canteiro das obras, ao realizar o transporte de cargas de elevado peso e volume de forma eficiente. A utilização da grua, além de diminuir o contingente de mão de obra e propiciar que os mesmos se dediquem a serviços de maior qualificação, possibilita a introdução de novas técnicas construtivas somente possíveis com a utilização destes equipamentos. Estudos realizados internacionalmente demonstraram que o processo de planejamento destes equipamentos é complexo, envolve vários intervenientes e é influenciado por duas classes de fatores: os hard factors, que envolvem as características técnicas do equipamento (dimensões físicas do local e capacidade de carga requerida) e os soft factors, que incluem especificações qualitativas e de natureza informal (aspectos de segurança da empresa, políticas de compra/aluguel e limitações ambientais). Neste contexto, o entendimento do processo de planejamento (escolha e localização) de gruas fixas utilizadas nos canteiros das obras de edificações em altura torna-se de fundamental importância para a melhoria dos sistemas de gestão destes equipamentos. Por isso, objetiva-se realizar um estudo acerca das práticas do uso de gruas fixas em canteiros das obras de edificações em altura na Região Metropolitana do Recife (RMR), a fim de diagnosticar o estágio atual da prática de seleção e uso destes equipamentos. O estudo foi realizado em dez edificações em altura (oito localizados em Recife e duas em Jaboatão – PE) pertencentes a oito construtoras distintas escolhidas por conveniência. O protocolo utilizado foi desenvolvido com ajuda de expert internacional no estudo de gruas, aprimorado a partir de aplicações em dezoito projetos de construções Portuguesas e adaptado a realidade das construções brasileiras a partir da aplicação piloto em duas edificações em altura do Recife. Os protocolos foram preenchidos a partir de visitas e entrevistas semi-estruturadas, pessoais com uma duração média de quatro horas. Foram entrevistados dois supervisores de obras, um engenheiro mecânico e dez engenheiros civis residentes nos canteiros dos projetos analisados. A fim de aumentar a confiabilidade da pesquisa utilizaram-se múltiplas fontes de dados complementares às entrevistas, como a documentação do canteiro, observação direta da operação da grua e registros fotográficos. A análise dos dados se deu por meio de planilhas Excel e indicou a existência de fatores culturas na seleção e localização dos equipamentos, evidenciando a predileção pelo uso de gruas do tipo ascencional localizadas no poço do elevador social dos empreendimentos. De acordo com os entrevistados, a escolha, planejamento e localização das gruas ocorrem exclusivamente na etapa de preparação e planejamento (preconstruction) do projeto construtivo, sendo o supervisor da construtora e o engenheiro residente os principais intervenientes envolvidos neste processo. O estudo apresentou limitações quanto à generalização dos resultados em função do tipo de amostragem adotado. Por isso, sugere-se a ampliação do número de canteiros de obras analisados e o desenvolvimento de um modelo multicritério de apoio à decisão que possa auxiliar o processo de seleção e localização de gruas na RMR

Made available in DSpace on 2020-01-14T18:12:13Z (GMT). No. of bitstreams: 1 5462217302PB.pdf: 784123 bytes, checksum: c1b665f2bd9974659c85e6e7800239f8 (MD5) Previous issue date: 2019

Made available in DSpace on 2018-01-26T23:44:14Z (GMT). No. of bitstreams: 1 Artigo4bananaGMR.pdf: 510244 bytes, checksum: 76db03037cac0e61e25c3e73b7871560 (MD5) Previous issue date: 2017-06-02

Made available in DSpace on 2017-09-29T10:33:50Z (GMT). No. of bitstreams: 1 Artigo6MangabaCAjun.pdf: 774987 bytes, checksum: e3d0c5913c0a9898c88aba6e602861ec (MD5) Previous issue date: 2017-09-28

Made available in DSpace on 2018-01-26T23:43:27Z (GMT). No. of bitstreams: 1 AV1.pdf: 451417 bytes, checksum: 8912979d21acb1d6813cb88c90b1f2d5 (MD5) Previous issue date: 2017-01-20

Cambui (Myrciaria tenella O. Berg) is a native species from Brazil, which belongs to the family Myrtaceae. Molecular characterization is one of the most used tools for the study of the biotechnological potential of species because the diversity level between individuals can be inferred. Analysis of enetic diversity is fundamental to the direction of the strategies necessary to form and maintain a germplasm. This study aimed to evaluate the genetic diversity in a natural population of cambui using inter-simple sequence repeat (ISSR) molecular markers. The natural population, which provided the plant material, is found at the Private Reserve of Natural Heritage of Caju, which belongs to the experimental field of Embrapa Tabuleiros Costeiros, in the municipality of Itaporanga d’Ajuda, SE, Brazil. Young leaves of each individual were collected for DNA extraction and analysis of PCR-ISSR. Thirty primers were tested and the top 10 were selected. The use of these primers resulted in 71 fragments with 98.3% polymorphism. Similarity of individuals ranged between 0.30 and 0.92. The most similar individuals were C13 and C17 and the most distant were C1 and C41. Through UPGMA, six distinct groups were identified. This information may be used for conservation of these genetic resources, germplasm exchange, creation of germplasm bank and in future studies with this species. Made available in DSpace on 2018-01-26T23:43:50Z (GMT). No. of bitstreams: 1 AV3.pdf: 1169452 bytes, checksum: c364a3570c8658819048eacf2ab64212 (MD5) Previous issue date: 2017-01-20

Made available in DSpace on 2018-01-26T23:43:38Z (GMT). No. of bitstreams: 1 AV2.pdf: 1034287 bytes, checksum: bb04af68b47e1d42ef4a6c7a727acd76 (MD5) Previous issue date: 2017-01-20