19,694 research outputs found
Uso de sensoriamento remoto para análise ambiental do Parque Manguezal do Itacorubi, Florianópolis - SC
Full text linkDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico.Entre as paisagens que aprensentam maior fragilidade na sua relação com o homem, os manguezais recebem impactos consideráveis, especialmente pela sua localização em terrenos inundáveis e quando receptores de efluentes dos centros urbanos. Desta forma, definiu-se como área de estudo o Parque Manguezal do Itacorubi localizado na área urbana do município de Florianópolis (SC), principalmente pelos diferentes tipos de interferência sofridas ao longo do processo de ocupação antrópica até a atualidade. Nesta perspectiva, o objetivo da pesquisa contemplou o uso das técnicas de sensoriamento remoto para avaliar alterações do uso e ocupação do solo no tempo, considerando os aspectos antrópicos do Parque Manguezal do Itacorubi, Florianópolis (SC). Desta forma, verificou-se os principais antecedentes à décadade 1930 e a análise das séries históricas de fotografias aéreas de 1938, 1957, 1969, 1978, 1994 e 1998 e posteriormente estruturou-se o Sistema de Informações Geográficas para posterior tomada de decisão. Finalmente, foi possível identificar períodos distintos de interferência antrópica como extração de vegetação, uso do solo para agropecuária e o processo de urbanização
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
Ogcogaster ronkayorum Hassan & Liu 2021, comb. nov.
No full textOgcogaster ronkayorum (Mészáros & Ábrahám, 2003), comb. nov. Horischema ronkayorum Mészáros & Ábrahám, 2003: 341. Type locality: Pakistan (Islamabad: Margalla Hills), Nepal (Annapurna Himal: Talbagar). comb. nov. Diagnosis. Morphologically, this species resembles Ogcogaster tessellata (Westwood, 1847) in having the narrow brownish marking just below pterostigma proximal to Sc+R vein, and the apical area beyond Sc+R with two rows of cells. However, it can be easily separated by the transparent wing membrane and the equal length of a tibial spur to Ta1. Distribution. Pakistan (Islamabad Capital Territory: Margalla Hills, Pir Sohava); Nepal (Annapurna Himal) (Mészáros & Ábrahám 2003).Published as part of Hassan, Muhammad Asghar & Liu, Xingyue, 2021, Taxonomic notes on owlflies from Pakistan (Neuroptera: Myrmeleontidae Ascalaphinae), pp. 401-452 in Zootaxa 4970 (3) on page 427, DOI: 10.11646/zootaxa.4970.3.1, http://zenodo.org/record/476654
sc-UniFrac groups oligodendrocytes by brain regions.
No full text(A) Hierarchical clustering by sc-UniFrac of scRNA-seq data generated from different regions of the brain according to [29]. Heat represents sc-UniFrac distance between two regions. (B) Schematic of brain regions for generating scRNA-seq data. (C) t-SNE plot of data combined from all brain regions, with oligodendrocytes from each region highlighted. Data from GSE75330. scRNA-seq, single-cell RNA sequencing; SN-VTA, substantia nigra and ventral tegmental area; t-SNE, t-distributed stochastic neighbor embedding.</p
DETERMINATION OF DISSOLVED-OXYGEN IN SEAWATER BY DIRECT SPECTROPHOTOMETRY OF TOTAL IODINE
No full textPREDICTION OF NITRATE CONCENTRATION FROM 2 END-MEMBER MIXING IN THE SOUTHERN EAST-CHINA-SEA
No full textCa-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
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