1,959,891 research outputs found
Microbial Quality and Risk Assessment of Type 2 NC Reclaimed Water for Non-Potable, and Potable Reuse
No full textNC Water Resources Research Institute and NC Urban Water Consortiu
Usinagem remota de peças prismáticas via internet em uma máquina cnc aderente ao padrão step-nc
Full text linkDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Mecânica, Florianópolis, 2014O atual padrão de programação dos centros de usinagem é ainda a norma (ISO 6983-1), conhecido como código G, que foi desenvolvido no final de 1950. Essa linguagem contém informações de baixo nível que efetuam o movimento da ferramenta no processo de usinagem, dificultando a tomada de decisões pelo operador no processo de usinagem. Por este motivo, a norma (ISO 6983-1) é uma das atuais limitações de flexibilidade e interoperabilidade na fabricação de peças. Diante disto, nos anos 1990 foi proposto um novo modelo de dados para os processos de usinagem, estendendo o padrão STEP - norma (ISO 10303-1) - para o novo padrão, denominado STEP-NC (ISO 14649-1), que foi desenvolvido como resultado de vários projetos realizados por empresas e universidades. No presente trabalho descreve-se o desenvolvimento e validação de software e hardware que permite o usuário comandar uma fresadora CNC tipo pórtico de maneira que ela venha a usinar peças de maneira aderente ao padrão STEP-NC norma (ISO 14649-11). O STEP-NC se baseia no conceito de workingsteps, features de usinagem e operações de usinagem, entre outras entidades descritas pela norma (ISO 14649-1). O software STEP-NC Controller foi desenvolvido utilizando a linguagem de programação Java, que possibilitou a criação de uma interface de controle da fresadora CNC para o processo de usinagem. Foi utilizada a programação do código aberto GRBL (software de controle e movimentos em máquinas) aderente à norma RS-274 (códigos G e M), para programar o microcontrolador Arduino MEGA2560 na linguagem de programação C. A programação do código G foi retirada do GRBL para dar lugar à programação do padrão STEP-NC baseado na norma (ISO 14649-1), permitindo assim que o arquivo no formato p21 (do padrão STEP) seja interpretado e enviado aos eixos de coordenadas da fresadora CNC. Uma conexão direta foi estabelecida entre o software STEP-NC Controller e a placa de 8 relés, para permitir que a fresadora CNC trabalhe de forma seletiva (código G e M ou STEP-NC). Além disso, uma operação remota da máquina via Internet foi implementada, possibilitando assim o envio do arquivo p21 via web, além do processo de usinagem poder ser acompanhado via webcam local.The current standard programming of machine centers is still the (ISO 6983-1) standard, known as G-code, which was developed in the 1950s. This language contains low-level information performing the movement of the tool in the machining process, making it difficult for the operator to take decisions in machining. For this reason, the (ISO 6983-1) standard currently limits significantly the flexibility and interoperability part manufacturing. Given this scenario, in the 1990s a new data model for manufacturing processes was proposed to extend the STEP standard (ISO 10303-1), called STEP-NC (ISO 14649-1 standard), which was developed as a result of numerous projects by companies and universities. In this paper we describe the development and validation of software and hardware that allows the user to command a CNC gantry milling machine so that it will machine parts using the STEP-NC standard (ISO 14649-11). STEP-NC is based on the concept of workingsteps, machining features and machining operations, among other entities described by the standard (ISO 14649-1). The STEP-NC Controller software was developed using the Java programming language, which enabled the creation of a control interface for the CNC milling machining process. Programming compliant with the RS-274 standard (G and M codes) generated by the open source software GRBL (software and control movements on machines) was used to program the Arduino MEGA2560 microcontroller in the C programming language. G-code programming was removed from GRBL in order to make room for use of the STEP-NC standard (ISO 14649-1), thus allowing the physical file p21 (a part of the STEP standard) to be interpreted and sent to the axes of the CNC milling machine. A direct connection is established between the STEP-NC Controller and a board with 8 relays to allow the CNC milling machine to work selectively (either with G and M code or STEP-NC). Remote operation of the machine via the Internet was also implemented, allowing the sending of a p21 file via web, and the machining process can be monitored via webcam
Role of Organic Nitrogen to Eutrophication Dynamics Along the Neuse River Estuary, NC
No full textNC Water Resources Research Institut
The construction of Karen Karnak: The multi-author-function
No full textThis thesis is situated within the comparatively recent developments of Web 2.0 and the emergence of interactive WikiMedia, and explores the mode of authorship within a Read/Write culture compared to that of a Read/Only tradition. The hypothesis of this study is that the role of the audience has become merged with the author, and as such, represents new functions and attributes, distinct from a more conventional concept of authorship, in which the roles of audience and author are more separate. Read/Write and participatory culture, as defined by this study, is focused on collaboration, and includes the influences of D.I.Y. culture, Open-Source practices and the production of text by multiple authors. Multi-authorship presents a re-thinking of several concepts which support the notion of the individual author, since the focus of multi-authorship is not on attribution and ownership of a finished text, but on the continued malleability of a text. Modes of multi-authorship, demonstrated in the use of the pseudonyms Alan Smithee and Karen Eliot, represent declarative authors whose names signify multiple origins, whilst concurrently indicating a distinct body of work. The function of these names form an important context to this study, since primary research involves the construction of an experimental mode of multi-authorship utilising WikiMedia technology and the interaction of thirty nine participants, who are invited to create a body of work under the collective pseudonym Karen Karnak. The data generated by this experiment is analysed using aspects of Michel Foucault's author-function to identify and determine power structures inherent in the WikiMedia context. The interplay of power structures, including concepts such as identity, ownership and the body of work, affect the resulting mode of authorship and contribute to the construction of Karen Karnak, suggesting further areas of research into the emerging multi-author
nc-eTAG GitHub Repository
No full textnc-eTAG GitHub repository of the NASA/ACCESS Oceanographic In-situ data Interoperability Project (OIIP).https://github.com/oceandatainterop/nc-eTAG/nc-eTAG is a data Interoperability specification for (non-acoustic) electronic tagging/animal telemetry data based on:the netCDF self-describing, scientific data format, the Climate Forecast (CF) and Attribute Conventions for Data Discovery (ACDD) metadata standards, and extensions developed by the OIIP project to accommodate rich metadata for eTAG applications.The nc-eTAG Github repository contains CDL templates and documentation materials pertaining to the specification. It is intended as an open collaborative space for community comment and contribution to advance the development of animal telemetry instrument data file and metadata specifications based on well established Earth Science data interoperability standards.</div
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
NC Celtic Studies (GF89 46)
No full textThe NC Celtic Studies at SCQF level 6 was validated in June 2012. The NC meets the needs of learners who wish to develop a foundation of knowledge and skills in Celtic culture, history, heritage, politics, music and dance. It also includes Gaelic language.
Understanding how land use characteristics affect the prevalence of antibiotic resistant, virulent E. coli and host-specific markers in watersheds with and without swine CAFOs
No full textNC WRRI; NC Sea Gran
Improving startup and operation of anaerobic co-digestion of grease interceptor waste
No full textNC WRRI and NC Urban Water Consortiu
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