Evaluation of test methods used to characterize fiber reinforced cementitious composites

This paper describes an investigation of fiber reinforced cementitious composites in terms of their behavior under tensile and flexural loading. Flexural testing and subsequent derivation of the tensile stress-deformation response from the flexural test data are preferred in the assessment of the tensile properties of Fiber Reinforced Cement Composites (FRCC) over the direct measurement of the tensile behavior because of the more convenient test setup and ease of specimen preparation. Three and four-point bending tests and round determinate panel test were carried out to evaluate the flexural response of FRCC. The assumptions made in the inverse analysis on the formation of cracking suggested in many standardized evaluation methods and established correlation methods have a strong influence on the results of the conversion from flexure to tension. In this paper, the formation of cracking and crack development have been quantitatively documented using a digital image correlation (DIC) system to investigate the validity of the commonly made assumptions

Digital Culture or Gutenberg Culture: Some Reflections on the Design Principles of Online Courses.

This short essay explores online course design, especially in the crisis conditions of the coronavirus pandemic. We reflect on the question of whether the basic design orientation in online classes should be toward textual or non-textual content, and we consider the view that textual content may in fact be far better

Gameanalyticsapp: projeto de aplicativo para estudo de anatomia humana utilizando analítica de aprendizagem para jogos

TCC (graduação) - Universidade Federal de Santa Catarina. Campus Araranguá. Tecnologias da Informação e ComunicaçãoO uso de tecnologias modernas para aplicações Web em conjunto com boas práticas no desenvolvimento de software permite criar uma base de código com qualidade e com potencial de escalabilidade para adição de funcionalidades durante o ciclo de desenvolvimento de software. Este trabalho de conclusão de curso tem como objetivo o desenvolvimento de uma base de código utilizando tecnologias Web baseadas em aplicações do tipo single-page e melhores práticas no desenvolvimento de software, tais como padrões de projeto (design patterns). Utilizando como base o projeto do EducaAnatomia3D (2020), desenvolveu-se uma estrutura para uma aplicação móvel onde o jogo sério poderá expandir em termos de possíveis funcionalidades futuras de forma rápida e escalável. Além disso a coleta de informações a respeito da sessão de estudo foi incorporada no projeto possibilitando explorar técnicas de analítica de aprendizagem e visualização dos dados através de painéis de controlo (dashboards). Dentro deste contexto, os resultados preliminares do projeto e desenvolvimento de um aplicativo intitulado GameAnalyticsApp são apresentados neste trabalho e disponíveis em uma url para acesso via web browser para testes durante o ciclo de desenvolvimento do software

Seasonal cycle of precipitation variability in South America on intraseasonal timescales

The seasonal cycle of the intraseasonal (IS) variability of precipitation in South America is described through the analysis of bandpass filtered outgoing longwave radiation (OLR) anomalies. The analysis is discriminated between short (10--30 days) and long (30--90 days) intraseasonal timescales. The seasonal cycle of the 30--90-day IS variability can be well described by the activity of first leading pattern (EOF1) computed separately for the wet season (October--April) and the dry season (May--September). In agreement with previous works, the EOF1 spatial distribution during the wet season is that of a dipole with centers of actions in the South Atlantic Convergence Zone (SACZ) and southeastern South America (SESA), while during the dry season, only the last center is discernible. In both seasons, the pattern is highly influenced by the activity of the Madden--Julian Oscillation (MJO). Moreover, EOF1 is related with a tropical zonal-wavenumber-1 structure superposed with coherent wave trains extended along the South Pacific during the wet season, while during the dry season the wavenumber-1 structure is not observed. The 10--30-day IS variability of OLR in South America can be well represented by the activity of the EOF1 computed through considering all seasons together, a dipole but with the stronger center located over SESA. While the convection activity at the tropical band does not seem to influence its activity, there are evidences that the atmospheric variability at subtropical-extratropical regions might have a role. Subpolar wavetrains are observed in the Pacific throughout the year and less intense during DJF, while a path of wave energy dispersion along a subtropical wavetrain also characterizes the other seasons. Further work is needed to identify the sources of the 10--30-day-IS variability in South America

Isotopic values of the Amazon headwaters in Peru: comparison of the wet upper Río Madre de Dios watershed with the dry Urubamba-Apurimac river system

RATIONALE: The Amazon River is a huge network of long tributaries, and little is known about the headwaters. Here we present a study of one wet tropical Amazon forest side, and one dry and cold Atiplano plateau, originating from the same cordillera. The aim is to see how this difference affects the water characteristics. METHODS: Different kind of water (spring, lake, river, rainfall) were sampled to determine their stable isotopes ratios (oxygen 18/16 and hydrogen 2/1) by continuous flow isotope ratio mass spectrometry (IRMS). These ratios coupled with chemical analysis enabled us to determine the origin of the water, the evaporation process and the water recycling over the Amazon plain forest and montane cloud forest. RESULTS: Our study shows that the water flowing in the upper Madre de Dios basin comes mainly from the foothill humid forest, with a characteristic water recycling process signature, and not from higher glacier melt. On the contrary, the water flowing in the Altiplano Rivers is mainly from glacier melts, with a high evaporation process. This snow and glacier are fed mainly by Atlantic moisture which transits over the large Amazon forest. CONCLUSIONS: The Atlantic moisture and its recycling over this huge tropical forest display a progressive isotopic gradient, as a function of distance from the ocean. At the level of the montane cloud forest and on the altiplano, respectively, additional water recycling and evaporation occur, but they are insignificant in the total water discharge