cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.11266844
title: Synthesis of perovskite-type LaAl1-xCrxO3 for application in transparent glaze

description: ABSTRACT In Brazil, studies on ceramic pigments are still very scarce. For this reason, most of the pigments consumed by the ceramic industry are imported to European countries. Another part of these pigments is obtained by the ceramic route, however, this route of synthesis results in pigments with very heterogeneous properties, reducing the quality of the coating. For this reason, several studies are aimed at developing synthetic routes that result in pigments with more homogenous properties, being environmentally friendly and economically viable. In context, the aim of this work was to synthesize oxides with perovskite structure of LaAl1-xCrxO3 composition (x = 0.1; x = 0.05) by the gelatin method, aiming its application as pigment for color transparent glazes. The powders resulting from the synthesis process were calcined at 800 and 1000 °C. Then they were characterized using thermal analysis, X-ray diffraction, UV–visible diffuse reflectance spectroscopy and CIElab colorimetry. The perovskite was used for the preparation of ceramic glazes by addition of 2 wt.% pigments on transparent glazes. X-ray patterns revealed single-phase powders with trigonal perovskite structure. The color of the samples varied as a function of the substituent content. The reddish hue was observed in the perovskites obtained with lower substitution of the Cr3+ ion and calcined at higher temperatures. No changes in the pigment color when introduced into transparent glazes were observed.
DOI: 10.6084/m9.figshare.11266853
title: Morphological diversity of foliar trichomes in Asteraceae from Sand-fields of the Pampa biome, Rio Grande do Sul State, Brazil

description: ABSTRACT Asteraceae is the largest family of angiosperms and occurs predominantly in grassland areas. This study aimed to identify and characterize the foliar trichomes of 34 Asteraceae species from Sand-fields of the Pampa biome, by means of epidermal analyzes (front and transverse view) under light and scanning electron microscopy. Eleven types of trichomes were identified and characterized: three glandular (recurved on the epidermis, erect-capitate and uniseriate to multiseriate vesicular-capitate) and eight non-glandular (simple conical, flagellate-filiform, aseptate-flagellate, whip-like, oblique-flagellate, branched with one arm, branched with two T-shaped arms, branched with three or more arms). The most representative glandular type was the uniseriate to multiseriate vesicular-capitate (58%) and the non-glandular type was the simple conical (35%). A large number of trichomes is an adaptive strategy to the adverse conditions of the Pampa biome and its morphological diversity can be useful in the family systematics.
DOI: 10.6084/m9.figshare.11266859.v1
title: A study on the compressive strength and microstructure characteristic of alkali-activated metakaolin cement

description: ABSTRACT The main purpose of this study was to investigate the compressive strength and microstructure characteristic of alkali-activated metakaolin cement (AAMC). In accordance with this purpose, besides the pure metakaolin activation five other mixtures were designed by substitution of different OPC ratios instead of metakaolin (MK) from 0 to 25 (5, 10, 15, 20, 25% OPC). AAMC was activated with sodium silicate (Na2SiO3) of modulus Ms = SiO2/Na2O = 3.1 and NaOH solutions (32% of NaOH, 68% of water by mass). The ratio of liquid/solid (L/S) was kept constant at 0.65. All specimens were cured at 70 °C for 72 hours then kept in room conditions until the days that experiments were performed. Compressive strength and UPV experiment tests were carried out on all specimens at different curing periods of 3,14,28 and 90 days. In addition, the microstructure of 28 days alkali-activated metakaolin cements were analyzed with scanning electron microscope (SEM). The results showed that AAMC specimens reached the desired strength and major part of the final strength was gained at the end of 3 days of curing.
DOI: 10.6084/m9.figshare.11266832
title: Natural abundance of 15N of N derived from the atmosphere by different strains of Bradyrhizobium in symbiosis with soybean plants

description: ABSTRACT: To quantify the BNF contribution to legumes using the 15N natural abundance technique, it is important to know the abundance of 15N of the plants grown entirely dependent on BNF (value ‘B’). The aim of the study was to determine the 15N natural abundance of N2 fixed by different Bradyrhizobium strains in symbiosis with one soybean cultivar. Treatments consisted of soybean plants cultivated with and without inoculation with ten Bradyrhizobium strains, in five replicates planted in Leonard jars in a sand/vermiculite mixture. Plants were harvested after 46 days. The ‘B’ values of the aerial tissue (‘Bs’) ranged from -2.6 to -3.9 ‰. There was a tendency for the ‘Bs’ values of plants inoculated with strains of B. elkanii to be more negative than plants inoculated with other strains. All ‘B’ values of the whole plant were less than 1 unit of δ15N (‰) different from zero, suggesting that the symbioses have little tendency to show significant isotopic fractionation during N2 fixation, but there is considerable depletion in 15N of the N translocated to the shoot tissue.
DOI: 10.6084/m9.figshare.11266844.v1
title: Synthesis of perovskite-type LaAl1-xCrxO3 for application in transparent glaze

description: ABSTRACT In Brazil, studies on ceramic pigments are still very scarce. For this reason, most of the pigments consumed by the ceramic industry are imported to European countries. Another part of these pigments is obtained by the ceramic route, however, this route of synthesis results in pigments with very heterogeneous properties, reducing the quality of the coating. For this reason, several studies are aimed at developing synthetic routes that result in pigments with more homogenous properties, being environmentally friendly and economically viable. In context, the aim of this work was to synthesize oxides with perovskite structure of LaAl1-xCrxO3 composition (x = 0.1; x = 0.05) by the gelatin method, aiming its application as pigment for color transparent glazes. The powders resulting from the synthesis process were calcined at 800 and 1000 °C. Then they were characterized using thermal analysis, X-ray diffraction, UV–visible diffuse reflectance spectroscopy and CIElab colorimetry. The perovskite was used for the preparation of ceramic glazes by addition of 2 wt.% pigments on transparent glazes. X-ray patterns revealed single-phase powders with trigonal perovskite structure. The color of the samples varied as a function of the substituent content. The reddish hue was observed in the perovskites obtained with lower substitution of the Cr3+ ion and calcined at higher temperatures. No changes in the pigment color when introduced into transparent glazes were observed.
DOI: 10.6084/m9.figshare.11266847.v1
title: Non destructive test in ceramic coating using a prototype for detection of pathology

description: ABSTRACT In the construction sector there is a growing investment in the maintenance and repair of constructions, such as the pathologies found on floors with ceramic coating. Among the most common pathologies, it is possible to highlight the inadequate seating of the ceramic floor, which are characterized by the loss of adhesion of some plates to their base (substrate). Due to the probability of accidents involving users and the high costs of repair, this is considered an important pathology. The objective of this work is to present a new nondestructive test methodology, based on the development of a tool based on the kinetic and acoustic response of a prototype, which, when a ceramic floor with the loss of adhesion is produced, produces “cavo” sound and a significant loss of to identify the occurrence of this pathology. Six types of ceramic flooring were used, in compliance and in conformity with the Brazilian standard, and then the coefficients of restitution of each plate were determined. The impact sounds on the boards were also picked up by a microphone and a piezoelectric pickup and processed through the Realtime Analyzer program, which produces charts that relate frequency, amplitude, sound energy, and time. The results obtained by the prototype were compared to other non-standard methods: wood rod, threaded rod, steel bar and metal sphere. It was concluded that the prototype is feasible for the detection of pathology of settlement of ceramic floor, proving to be a preventive and non-destructive strategy.
DOI: 10.6084/m9.figshare.11266826
title: Artificial intelligence, machine learning, computer-aided diagnosis, and radiomics: advances in imaging towards to precision medicine

description: Abstract The discipline of radiology and diagnostic imaging has evolved greatly in recent years. We have observed an exponential increase in the number of exams performed, subspecialization of medical fields, and increases in accuracy of the various imaging methods, making it a challenge for the radiologist to “know everything about all exams and regions”. In addition, imaging exams are no longer only qualitative and diagnostic, providing now quantitative information on disease severity, as well as identifying biomarkers of prognosis and treatment response. In view of this, computer-aided diagnosis systems have been developed with the objective of complementing diagnostic imaging and helping the therapeutic decision-making process. With the advent of artificial intelligence, “big data”, and machine learning, we are moving toward the rapid expansion of the use of these tools in daily life of physicians, making each patient unique, as well as leading radiology toward the concept of multidisciplinary approach and precision medicine. In this article, we will present the main aspects of the computational tools currently available for analysis of images and the principles of such analysis, together with the main terms and concepts involved, as well as examining the impact that the development of artificial intelligence has had on radiology and diagnostic imaging.
DOI: 10.6084/m9.figshare.11266832.v1
title: Natural abundance of 15N of N derived from the atmosphere by different strains of Bradyrhizobium in symbiosis with soybean plants

description: ABSTRACT: To quantify the BNF contribution to legumes using the 15N natural abundance technique, it is important to know the abundance of 15N of the plants grown entirely dependent on BNF (value ‘B’). The aim of the study was to determine the 15N natural abundance of N2 fixed by different Bradyrhizobium strains in symbiosis with one soybean cultivar. Treatments consisted of soybean plants cultivated with and without inoculation with ten Bradyrhizobium strains, in five replicates planted in Leonard jars in a sand/vermiculite mixture. Plants were harvested after 46 days. The ‘B’ values of the aerial tissue (‘Bs’) ranged from -2.6 to -3.9 ‰. There was a tendency for the ‘Bs’ values of plants inoculated with strains of B. elkanii to be more negative than plants inoculated with other strains. All ‘B’ values of the whole plant were less than 1 unit of δ15N (‰) different from zero, suggesting that the symbioses have little tendency to show significant isotopic fractionation during N2 fixation, but there is considerable depletion in 15N of the N translocated to the shoot tissue.
DOI: 10.6084/m9.figshare.11266841
title: Synthesis and characterization of the Fe3O4@SiO2 nanoparticles

description: ABSTRACT In this work the synthesis and characterization of the magnetic nanoparticles of magnetite (Fe3O4) from the methodology via co-precipitation and its subsequent functionalization by silica (SiO2), carried out via sol-gel methodology were studied. The characterization of the nanoparticles was performed by X-ray diffractometry (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and zeta potential variation as a function of pH. The results showed that the synthesis of the Fe3O4 and Fe3O4@SiO2 nanoparticles was successful, with a high homogeneity of shape and size, according to the results of the analysis of the images obtained by MET, including the formation of shell structures for the Fe3O4@SiO2 nanoparticles. The functionalization of the magnetite surface was confirmed by the FTIR data and the zeta potential measurements. Surface functionalization by silica causes an increase in nanoparticle size due to the introduction of an inorganic shell around magnetite nanoparticles. The zeta potential curves showed that with the addition of silica, the colloidal stability increases in relation to the magnetite and this increase is related to the functionalized silica that should be minimizing the surface energies around the magnetic nanoparticles.
DOI: 10.6084/m9.figshare.11266853.v1
title: Morphological diversity of foliar trichomes in Asteraceae from Sand-fields of the Pampa biome, Rio Grande do Sul State, Brazil

description: ABSTRACT Asteraceae is the largest family of angiosperms and occurs predominantly in grassland areas. This study aimed to identify and characterize the foliar trichomes of 34 Asteraceae species from Sand-fields of the Pampa biome, by means of epidermal analyzes (front and transverse view) under light and scanning electron microscopy. Eleven types of trichomes were identified and characterized: three glandular (recurved on the epidermis, erect-capitate and uniseriate to multiseriate vesicular-capitate) and eight non-glandular (simple conical, flagellate-filiform, aseptate-flagellate, whip-like, oblique-flagellate, branched with one arm, branched with two T-shaped arms, branched with three or more arms). The most representative glandular type was the uniseriate to multiseriate vesicular-capitate (58%) and the non-glandular type was the simple conical (35%). A large number of trichomes is an adaptive strategy to the adverse conditions of the Pampa biome and its morphological diversity can be useful in the family systematics.
DOI: 10.6084/m9.figshare.11266817
title: CENTER X PERIPHERY RELATIONS: THE UNIVERSITY IN DEBATE

description: ABSTRACT: This paper aims to approach the complexity of the center-periphery relationship within the context of the Latin American university, of the internationalization of Higher Education and of scientific knowledge. Approaching the issue is grounded on the concepts of science capital by Bourdieu; of center-periphery relationship, by Kreimer and of hegemonic rationality in Sousa Santos. The university is discussed as a space of reproduction and/or tensioning of rationality, facing new contexts, such as the internationalization / mercantilization of Higher Education and the international rankings dominated by institutions of mainstream countries. In this scenario, the knowledge/science produced in the periphery needs to restore the university as a counter-hegemonic space. Education, understood as a public good - in universities in Latin America - can be potent and strengthen counter-hegemonic policies and actions, seeking for a propositive insertion in the global reality.
DOI: 10.6084/m9.figshare.11266826.v1
title: Artificial intelligence, machine learning, computer-aided diagnosis, and radiomics: advances in imaging towards to precision medicine

description: Abstract The discipline of radiology and diagnostic imaging has evolved greatly in recent years. We have observed an exponential increase in the number of exams performed, subspecialization of medical fields, and increases in accuracy of the various imaging methods, making it a challenge for the radiologist to “know everything about all exams and regions”. In addition, imaging exams are no longer only qualitative and diagnostic, providing now quantitative information on disease severity, as well as identifying biomarkers of prognosis and treatment response. In view of this, computer-aided diagnosis systems have been developed with the objective of complementing diagnostic imaging and helping the therapeutic decision-making process. With the advent of artificial intelligence, “big data”, and machine learning, we are moving toward the rapid expansion of the use of these tools in daily life of physicians, making each patient unique, as well as leading radiology toward the concept of multidisciplinary approach and precision medicine. In this article, we will present the main aspects of the computational tools currently available for analysis of images and the principles of such analysis, together with the main terms and concepts involved, as well as examining the impact that the development of artificial intelligence has had on radiology and diagnostic imaging.
DOI: 10.6084/m9.figshare.11266841.v1
title: Synthesis and characterization of the Fe3O4@SiO2 nanoparticles

description: ABSTRACT In this work the synthesis and characterization of the magnetic nanoparticles of magnetite (Fe3O4) from the methodology via co-precipitation and its subsequent functionalization by silica (SiO2), carried out via sol-gel methodology were studied. The characterization of the nanoparticles was performed by X-ray diffractometry (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and zeta potential variation as a function of pH. The results showed that the synthesis of the Fe3O4 and Fe3O4@SiO2 nanoparticles was successful, with a high homogeneity of shape and size, according to the results of the analysis of the images obtained by MET, including the formation of shell structures for the Fe3O4@SiO2 nanoparticles. The functionalization of the magnetite surface was confirmed by the FTIR data and the zeta potential measurements. Surface functionalization by silica causes an increase in nanoparticle size due to the introduction of an inorganic shell around magnetite nanoparticles. The zeta potential curves showed that with the addition of silica, the colloidal stability increases in relation to the magnetite and this increase is related to the functionalized silica that should be minimizing the surface energies around the magnetic nanoparticles.
DOI: 10.6084/m9.figshare.11266811
title: Academic Experiences of University Students with Autism Spectrum Disorders: an Interpretative Analysis of Report

description: ABSTRACT: Given the growing rate of adults with Autism Spectrum Disorders (ASD) entering university, this study sought to describe the academic experience of six students with this diagnosis, regularly enrolled in a public university in the state of São Paulo. Individual interviews were conducted to identify topics related to undergraduate entry, permanence, accessibility, relationships and suggestions for improvements in the university context. Based on the precepts of the Historical-Cultural Psychology, we used the qualitative analysis of the reports, especially the core of meaning, which constituted the initial establishment of pre-indicators, followed by the agglutination of this content into indicators, and the construction of the Core of Meaning. As a result, poor interactional experiences were verified during Basic Education. At the university, the controversies between interest in undergraduate studies and lack of preparation in the university context appeared as factors that generate anguish and anxiety associated with barriers to permanence and the need to complete the course within the regulatory period. It was identified the need for adjustments both in the singular and in the academic social context, with emphasis on the participation of students with ASD, which is still little debated and recognized, and the adaptations to the environment, which fall mainly to the subject, against the precepts of educational inclusion.
DOI: 10.6084/m9.figshare.11266814
title: Copper use efficiency in soybean cultivars

description: Abstract: The objective of this work was to evaluate the effect of copper use efficiency in soybean cultivars, grown on a typical Ultisol with a high organic matter content, on soil chemical properties and on plant grain yield, nutritional state, and physiological components. The experiment was carried out in greenhouse conditions, in a 5×4 factorial arrangement, with five soybean cultivars (TMG 1066RR, BRS 360RR, NA 6262RR, BMX Turbo RR, and BRS 359RR) and four Cu rates (0, 2, 4, and 8 mg kg-1). Under the studied soil conditions, the DTPA-TEA and Mehlich-1 extractants were efficient in determining available Cu in the soil. Regardless of the cultivars, Cu application increased grain yield (GY), shoot dry weight yield (SDWY), number of pods per pot, GY/SDWY ratio, photosynthetic rate, stomatal conductance, internal CO2 concentration, transpiration rate, and chlorophyll content. However, Cu use efficiency varied significantly among the different soybean genotypes. Except for Cu, soil chemical attributes and foliar and grain nutrient contents are not influenced by Cu rates nor by soybean cultivars.
DOI: 10.6084/m9.figshare.11266802
title: The role of gadoxetic acid-enhanced magnetic resonance cholangiography in the evaluation of postoperative bile duct injury: pictorial essay

description: Abstract Iatrogenic lesion of the bile ducts is a relatively common occurrence during liver surgery, increasing morbidity and mortality rates. T2-weighted magnetic resonance cholangiography and gadoxetic acid-enhanced functional magnetic resonance cholangiography (fMRC) with administration of hepatobiliary-specific contrast medium (gadoxetic acid) are fundamental to the diagnostic imaging approach in patients with such lesions. Here, we present a review of the literature and suggest an imaging approach to biliary tract injury, focusing on clinical cases in which fMRC had an impact on the decision-making process for the management of the affected patients.
DOI: 10.6084/m9.figshare.11266814.v1
title: Copper use efficiency in soybean cultivars

description: Abstract: The objective of this work was to evaluate the effect of copper use efficiency in soybean cultivars, grown on a typical Ultisol with a high organic matter content, on soil chemical properties and on plant grain yield, nutritional state, and physiological components. The experiment was carried out in greenhouse conditions, in a 5×4 factorial arrangement, with five soybean cultivars (TMG 1066RR, BRS 360RR, NA 6262RR, BMX Turbo RR, and BRS 359RR) and four Cu rates (0, 2, 4, and 8 mg kg-1). Under the studied soil conditions, the DTPA-TEA and Mehlich-1 extractants were efficient in determining available Cu in the soil. Regardless of the cultivars, Cu application increased grain yield (GY), shoot dry weight yield (SDWY), number of pods per pot, GY/SDWY ratio, photosynthetic rate, stomatal conductance, internal CO2 concentration, transpiration rate, and chlorophyll content. However, Cu use efficiency varied significantly among the different soybean genotypes. Except for Cu, soil chemical attributes and foliar and grain nutrient contents are not influenced by Cu rates nor by soybean cultivars.
DOI: 10.6084/m9.figshare.11266817.v1
title: CENTER X PERIPHERY RELATIONS: THE UNIVERSITY IN DEBATE

description: ABSTRACT: This paper aims to approach the complexity of the center-periphery relationship within the context of the Latin American university, of the internationalization of Higher Education and of scientific knowledge. Approaching the issue is grounded on the concepts of science capital by Bourdieu; of center-periphery relationship, by Kreimer and of hegemonic rationality in Sousa Santos. The university is discussed as a space of reproduction and/or tensioning of rationality, facing new contexts, such as the internationalization / mercantilization of Higher Education and the international rankings dominated by institutions of mainstream countries. In this scenario, the knowledge/science produced in the periphery needs to restore the university as a counter-hegemonic space. Education, understood as a public good - in universities in Latin America - can be potent and strengthen counter-hegemonic policies and actions, seeking for a propositive insertion in the global reality.