7,661 research outputs found
Public Attitudes about Urban Lawns: Social Opportunities Provided by Urban Lawns in Lund, Sweden
No full textSince the 19th century, urban lawns have gradually taken center stage to become one of the main sources of greening in many cities around the world. The current published research on planting technology, maintenance techniques, the impact of lawn maintenance, preferences for manicured lawns and the biodiversity protection for historical lawns as topics, has developed and increased over time. However, what has been less researched is the relationship and interplay between the perceptions of urban residents and their use of urban lawns. More specifically, our research focused on the question of how residents view, socialize and utilize city lawns accessible to them. To provide some insight into this area of urban lawn use, our research study was conducted in Lund, Sweden a city that uses lawns as their main form of greening. To accomplish the study's objectives the city's lawns were grouped into the following categories:(1) park lawns, (2) residential neighborhood lawns, (3) lawns around public buildings, (4) lawns surrounding residential buildings, (5) lawns along greenways and (6) lawns along roads. By means of distributed open-ended questionnaires the researchers discovered two important findings. First, the socialization patterns and utilization of lawns differed between the six categories due to various factors which included the suitability of the land use. The data also showed that the efficiency of planting lawns in certain areas impacts the ability to access areas for socialization activities (i.e. roadsides and greenways). Secondly, the study revealed that the planting collocation and service facilities of lawns greatly influences residents' ability and opportunities for social interaction. Two other study findings were of interest namely that (1) the utilization of lawns among Lund's working class was somewhat lower than that of students; and (2) that socialization and use of lawns were not necessarily related to the user's accustomed environmental background. Subsequently, this article discusses key themes that include residents' attitudes, beliefs and opinions about the interaction of socializing and the meaning of those interactions in an urban environment. It is our purpose that this article spurs a more robust international dialogue about pragmatic lessons urban planners may learn about future designing efforts of urban green space in newly developing cities and established ones already confronting modern space and housing challenges.Social Sciences, InterdisciplinaryCPCI-SSH(ISSHP)
SC author and illustrator Kate Salley Palmer signing book
No full textPhotograph of SC author and illustrator Kate Salley Palmer signing boo
Book signing by SC author and illustrator Kate Salley Palmer
No full textPhotograph of Book signing by SC author and illustrator Kate Salley Palme
High-resolution clean-sc
No full textIn this paper a high-resolution extension of CLEAN-SC is proposed: HR-CLEAN-SC. Where CLEAN-SC uses peak sources in “dirty maps” to define so-called source components, HR-CLEAN-SC takes advantage of the fact that source components can likewise be derived from points at some distance from the peak, as long as these “source markers” are on the main lobe of the Point Spread Function (PSF). This is very useful when sources are closely spaced together, such that their PSFs interfere. Then, alternative markers can be sought in which the relative influence by PSFs of other source positions is minimised. For those markers the source components better agree with the actual sources, which allows for better estimation of their locations and strengths. This paper outlines the theory needed to understand this approach and discusses applications to 2D and 3D microphone array simulations with closely spaced sources
SC author and illustrator Kate Salley Palmer talking to event attendees
No full textPhotograph of SC author and illustrator Kate Salley Palmer talking to Rita Lewi
Ca-modified Al–Mg–Sc alloy with high strength at elevated temperatures due to a hierarchical microstructure
No full textAl-Mg alloys are normally prone to lose part of their yield and tensile strength at high temperatures due to insufficient thermal stability of the microstructure. Here, we present a Ca-modified Al–Mg–Sc alloy demonstrating high strength at elevated temperatures. The microstructure contains Al4Ca phases distributed as a network along the grain boundary and Al3(Sc,Zr) nano-particles dispersed within the grains. The microstructure evolution and age-hardening analysis indicate that the combination of an Al4Ca network and Sc-rich nano-particles leads to excellent thermal stability even upon aging at 300 °C. The tensile strength of the alloy for temperatures up to 250 °C is significantly improved by an aging treatment and is comparable with the commercial heat-resistant aluminum alloys, i.e., A356 and A319. At a high temperature of 300 °C, the tensile strength is superior to the above-mentioned commercial alloys, even more so when expressed as the specific strength due to the low density of Ca-modified Al–Mg–Sc alloy. The excellent high-temperature strength results from a synergistic effect of solid solution strengthening, grain boundary strengthening and nanoparticle order strengthening.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Novel Aerospace Material
SC-Square: Overview to 2021.
No full textThis extended abstract was written to accompany an invited talk at the 2021 SC-Square Workshop, where the author was asked to give an overview of SC-Square progress to date. The author first reminds the reader of the definition of SC-Square, then briefly outlines some of the history, before picking out some (personal) scientific highlights
SC-Square: Overview to 2021.
No full textThis extended abstract was written to accompany an invited talk at the 2021 SC-Square Workshop, where the author was asked to give an overview of SC-Square progress to date. The author first reminds the reader of the definition of SC-Square, then briefly outlines some of the history, before picking out some (personal) scientific highlights
Modelagem e análise computacional da lubrificação do conjunto eixo, biela e pistão em compressores alternativos
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Mecânica.Esta dissertação trata da solução do sistema dinâmico mancalizado de um compressor alternativo. O sistema é composto por eixo, biela e pistão, sustentados por mancais hidrodinâmicos. Sendo assim, o sistema é passível a desalinhamentos e deflexões, resultando em perdas mecânicas e termodinâmicas. Modelos de dinâmica foram estudados e comparados, bem como os modelos de mancalização. A resolução do problema de mancalização baseia-se na obtenção do campo de pressão a partir da Equação de Reynolds para lubrificação, tendo como volumes finitos a metodologia de solução. Tanto modelos de mancal curto como de mancal finito foram adotados neste trabalho, verificando-se vantagens e desvantagens associadas à utilização de ambos modelos. Na dinâmica do mecanismo foi incorporada a deflexão da biela e a sua influência no sistema foi analisada. Os resultados permitiram uma compreensão melhor do mecanismo de compressão. O comportamento dinâmico é apresentado através das órbitas dos mancais, das potências dissipadas e dos efeitos de flexão e de desalinhamento. Verificou-se a importância da análise do sistema em conjunto e de como os movimentos secundários das partes móveis pode afetar o ciclo de compressão que, por sua vez, afeta as eficiências termodinâmica e mecânica do compressor
Aplicação do modelo ASM1 em uma ete de lodos ativados
No full textTCC(graduação) - Universidade Federal de Santa Catarina. Centro Tecnológico. Engenharia Sanitária e Ambiental.Muitas estações de tratamento de esgoto no Brasil e no mundo tem como base de tratamento o processo de lodos ativados, tendo em vista a importância deste sistema, a necessidade de melhor entender o processo dinamicamente e garantir a eficiência de tratamento iniciou-se o estudo da modelagem desse processo. Neste projeto utilizou-se o modelo ASM1 para avaliar o comportamento do sistema de lodos ativados de uma ETE de lodos ativados, localizada em Florianópolis/SC. Utilizaram-se duas séries de amostras, uma para calibração do modelo no estado estacionário e uma para validação do modelo. A ETE foi estruturada no programa WRc STOAT com seus reatores biológicos, decantadores secundários e adensadores de lodo. Seis parâmetros do modelo ASM1 foram calibrados e dois destes reavaliados durante a validação. Com o modelo estruturado e validado foram criados diversos cenários a fim de simular a estação em diversas situações. Estes cenários foram divididos em quatro subgrupos: vazão e concentração, operação, crise e outros cenários. Sendo assim, o modelo se mostrou como uma ótima ferramenta de predição às possíveis transformações que a ETE está sujeita
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