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Influence of the shape of head anchors on the durability of reinforced concrete elements
Martinez-Echeverria, M. Jose,Gil-Martin, Luisa Maria,Montero, Jose Rodriguez,Hernandez-Montes, Enrique Techno-Press 2020 Advances in concrete construction Vol.10 No.1
This paper looks into how the shape of headed bars may influence the durability of reinforced concrete structures. Nowadays the only heads used in site works are cylindrical in shape. An alternative shape of head is studied in this piece of work. The new head reduces the concentration of stresses and so the appearance of cracks. In this work durability is studied based on both, first cracking and failure mode. An experimental campaign of 12 specimens and finite element modelling are described. The specimens were subjected to an accelerated corrosion process using an electrical current supply. Direct current was impressed on the specimens until breaking. Test results and the results obtained from numerical models are presented. Results are presented in term of comparison between the two shapes of heads studied. It was shown that the shape of the head has a significant influence on durability of reinforced concrete structures with headed reinforcing bars.
Evaluation of Novel Platelet Polymorphisms in Stroke. Dichotomic Effect of rs5443 in GNB3
Constantino Martínez,Ana Isabel Antón,Agustina Bernal,María Luisa Lozano,Francisca Ferrer-Marin,Javier Corral,Juan Antonio Iniesta,Vicente Vicente,José Rivera 대한신경과학회 2015 Journal of Clinical Neurology Vol.11 No.1
Eun Young Lee,Maria Luisa G. Tejada,Insun Song,Seung Soo Chun,Susanne Gier,Laurent Riquier,Lloyd T. White,Bernhard Schnetger,Hans-Jurgen Brumsack,Matthew M. Jones,Mathieu Martinez 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
This study investigates the linkages between physical properties, primary lithology, and alteration processes of a volcanic sequence at Site U1513 on the Naturaliste Plateau, offshore southwest Australia. The volcanic eruption and emplacement occurred in subaerial to shallow water setting on the rifted continental margin during the Early Cretaceous. The volcanic sequence consists of alternating basalt flows and volcaniclastic deposits, intruded by multiple dolerite dikes. We compile a variety of petrophysical data and correlate these with lithologic, mineralogical, and geochemical analyses (e.g., XRD, XRF), acquired during and after the International Ocean Discovery Program (IODP) Expedition 369. Variable alteration intensities from fresh-slight to strong are evaluated using Chemical Index of Alteration, alteration mineralogy, and textural changes. Intervals of fresh-slightly altered dikes exhibit low porosity (~13%) and high values of bulk density (~2.7 g/cm³), P-wave velocity (~4900 m/s) and thermal conductivity (~1.7 W/(m·K)). The increase of alteration intensity corresponds to decreases in bulk density to ~2 g/cm³, P-wave velocity to ~2000 m/s, thermal conductivity to ~1.2 W/(m·K) and an increase in porosity up to 50%. Natural Gamma Ray and magnetic susceptibility vary downhole with rock composition and at lithologic boundaries. The distinct physical variations exhibit a good correlation with primary lithologic characteristics as well as secondary mineralogical and textural changes attributed to alteration processes by subaerial exposure, seawater interaction and hydrothermal activities. Synthesis models of petrophysical variation with alteration intensity are provided for future studies. Although limitations and uncertainties are introduced due to differences in primary lithology, alteration type, and petrophysical methodology, there is a reasonable applicability of our results to rapidly characterize the alteration intensity and volcanic stratigraphy in volcanic sequences. Our results can be used to develop strategies better for exploration, drilling, and geophysical research of volcanic terrains.
( Goes,Kelly Campos Guerra Pinheiro De ),( Maria Luisa De Castro Fisher ),( Alexandre Jose Cattelan ),( Marco Antonio Nogueira ),( Claudio Guilherme Portela De Carvalho ),( Andre Luiz Martinez De Oliv 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.4
Natural and beneficial associations between plants and bacteria have demonstrated potential commercial application for several agricultural crops. The sunflower has acquired increasing importance in Brazilian agribusiness owing to its agronomic characteristics such as the tolerance to edaphoclimatic variations, resistance to pests and diseases, and adaptation to the implements commonly used for maize and soybean, as well as the versatility of the products and by-products obtained from its cultivation. A study of the cultivable bacteria associated with two sunflower cultivars, using classical microbiological methods, successfully obtained isolates from different plant tissues (roots, stems, florets, and rhizosphere). Out of 57 plantgrowth- promoting isolates obtained, 45 were identified at the genus level and phylogenetically positioned based on 16S rRNA gene sequencing: 42 Bacillus (B. subtilis, B. cereus, B. thuringiensis, B. pumilus, B. megaterium, and Bacillus sp.) and 3 Methylobacterium komagatae. Random amplified polymorphic DNA (RAPD) analysis showed a broad diversity among the Bacillus isolates, which clustered into 2 groups with 75% similarity and 13 subgroups with 85% similarity, suggesting that the genetic distance correlated with the source of isolation. The isolates were also analyzed for certain growth-promoting activities. Auxin synthesis was widely distributed among the isolates, with values ranging from 93.34 to 1653.37 μM auxin per μg of protein. The phosphate solubilization index ranged from 1.25 to 3.89, and siderophore index varied from 1.15 to 5.25. From a total of 57 isolates, 3 showed an ability to biologically fix atmospheric nitrogen, and 7 showed antagonism against the pathogen Sclerotinia sclerotiorum. The results of biochemical characterization allowed identification of potential candidates for the development of biofertilizers targeted to the sunflower crop.