cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.7243754.v1
title: Comparative study between strain gages for determination of autogenous shrinkage

description: ABSTRACT The Carlson-type strain gages are the most suitable for the measurement of autogenous shrinkage. However, your high cost is usually a limiting factor for your employment. A more economical alternative would be the use of Self-Temperature-Compensation Gages to be embedded in concrete. The main objective of this work was to verify if Self-Temperature-Compensation Gages can be used instead of the Carlson type to determine the autogenous shrinkage in high performance concrete. It was carried out measurements of the autogenous shrinkage, for the same concrete mix, using the two types of extensometers. The difference in the means of the autogenous shrinkage results between these two types of extensometers was typically less than 10x10-6 m/m.
DOI: 10.7284/135142
title: Gravimeter data collected during research cruise SKQ201919S using a Bell BGM-3 instrument system onboard the platform RV Sikuliaq

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7243748
title: The Gravatá river artesanal fishermen perceptions of environmental and climate changes

description: Abstract: The current environment and climate change are influencing life on Earth. Therefore, the focus of this article aims to analyze the perception of the fishermen in relation to this subject at Gravata´s river in Navegantes, SC. The methodology consisted of documentary analysis and interviews. Results identify convergences and divergences between scientific and empirical data. The conclusions reflect the need to adopt more sustainable actions and the participation of the local population in the decision making that will affect their daily lives.
DOI: 10.6084/m9.figshare.7243751.v1
title: Incorporation of nanosilica in cement composites

description: ABSTRACT The incorporation of the nanosilica has been studied as an alternative to improve the characteristics of cementitious materials because tends to increase the pozzolanic reactions and fill the interstitial spaces, decreasing the porosity and improving the compressive strength. In this context, the present study has the goal to evaluate the mechanical behavior and the microstructural characteristics of three cementitious composites: the reference e two with different levels of nanosilica dispersed in polycarboxylate (NDP), 0.2 and 0.4%, in relation to the cement mass. The mechanical behavior was evaluated through the compressive strength test and tensile test (Brazilian denomination). Furthermore, were done water absorption tests and microstructural analysis by Scanning Electron Microscope (SEM). From the analysis of the results, it was verified that the addition of NDP improved the mechanical properties and the microstructural characteristics of cementitious composites. The NDP content (0.4%) showed better results at 28 days, presenting a 55% increase in compressive strength, 79% tensile test and a 40% decrease in the absorption of water, in relation to the reference, possibly through the NDPs performance. However, when analyzing the incorporation of the two NDP contents, it was verified that when the content was doubled there was no significant improvement in the compressive strength, since the incorporation of 0.2% of NDP increased the compressive strength in 53% in relation to the reference. As for the microstructural analysis, a refinement of the structure was verified from the incorporation of NDP but no differences between the two incorporation was visualized.
DOI: 10.6084/m9.figshare.7243745
title: Performance evaluation of hot asphalt concrete with incorporation of RAP

description: ABSTRACT The scarcity of natural resources and the demand for alternative reuse of materials has made recycling a slogan in the current scenario of global road construction. A floor milling (Recycled Asphalt Pavement – RAP) yields a material with high economic value and excellent physical and mechanical properties that may be introduced in the composition of new asphalt mixtures, from 2.5% to 4.5%. This study evaluated the mechanical mixtures machined hot with addition of different amounts of new binder behavior. The study material comes from the Brazilian Highway 290 (BR-290), passage located between the municipalities of Rosario do Sul and São Gabriel, in the state of Rio Grande do Sul (RS). For characterization of the milled material was performed assays grading, bitumen extraction, Marshall stability and creep and tensile strength by diametral-compression proof bodies of cylindrical specimens molded in accordance with the proposals mixtures. According to the results, we obtained values of stability, creep and tensile strength by diametral compression, suitable for the application of milled material (50% and 100% addition) in asphalt mixtures for layers bearing. Therefore, the reuse of this material, in the proportions evaluated, from the pavement itself, in addition to meeting the technical specifications, also appears as a solution for the avoid inadequate deposition of the same, reducing environmental passive.
DOI: 10.6084/m9.figshare.7243748.v1
title: The Gravatá river artesanal fishermen perceptions of environmental and climate changes

description: Abstract: The current environment and climate change are influencing life on Earth. Therefore, the focus of this article aims to analyze the perception of the fishermen in relation to this subject at Gravata´s river in Navegantes, SC. The methodology consisted of documentary analysis and interviews. Results identify convergences and divergences between scientific and empirical data. The conclusions reflect the need to adopt more sustainable actions and the participation of the local population in the decision making that will affect their daily lives.
DOI: 10.7284/135145
title: Gyrocompass data collected during research cruise SKQ201919S using a Sperry NAVIGAT 2100 instrument system onboard the platform RV Sikuliaq

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7243742
title: Mineralogical characterization of an Acre soil in order to produce calcined clay aggregates for pavements

description: ABSTRACT This paper presents the experimental results of the evaluation of the mineralogical features of a soil from the Southwest of the Brazilian Amazon used to produce calcined aggregates for road pavements. The identification of clay minerals by X-Ray Diffraction technique is more efficient when preceded by preliminary sample treatments involving sedimentation, iron removal and preparation of microscope slides under glycol-saturated and heated conditions. The results show that the soil presents mineralogical features suitable for the production of calcined aggregates with acceptable mechanical behavior for the proposed use; they also show that the preliminary classification involving physical indexes are not always sufficient to verify the suitability of the soils.
DOI: 10.6084/m9.figshare.7243742.v1
title: Mineralogical characterization of an Acre soil in order to produce calcined clay aggregates for pavements

description: ABSTRACT This paper presents the experimental results of the evaluation of the mineralogical features of a soil from the Southwest of the Brazilian Amazon used to produce calcined aggregates for road pavements. The identification of clay minerals by X-Ray Diffraction technique is more efficient when preceded by preliminary sample treatments involving sedimentation, iron removal and preparation of microscope slides under glycol-saturated and heated conditions. The results show that the soil presents mineralogical features suitable for the production of calcined aggregates with acceptable mechanical behavior for the proposed use; they also show that the preliminary classification involving physical indexes are not always sufficient to verify the suitability of the soils.
DOI: 10.6084/m9.figshare.7243745.v1
title: Performance evaluation of hot asphalt concrete with incorporation of RAP

description: ABSTRACT The scarcity of natural resources and the demand for alternative reuse of materials has made recycling a slogan in the current scenario of global road construction. A floor milling (Recycled Asphalt Pavement – RAP) yields a material with high economic value and excellent physical and mechanical properties that may be introduced in the composition of new asphalt mixtures, from 2.5% to 4.5%. This study evaluated the mechanical mixtures machined hot with addition of different amounts of new binder behavior. The study material comes from the Brazilian Highway 290 (BR-290), passage located between the municipalities of Rosario do Sul and São Gabriel, in the state of Rio Grande do Sul (RS). For characterization of the milled material was performed assays grading, bitumen extraction, Marshall stability and creep and tensile strength by diametral-compression proof bodies of cylindrical specimens molded in accordance with the proposals mixtures. According to the results, we obtained values of stability, creep and tensile strength by diametral compression, suitable for the application of milled material (50% and 100% addition) in asphalt mixtures for layers bearing. Therefore, the reuse of this material, in the proportions evaluated, from the pavement itself, in addition to meeting the technical specifications, also appears as a solution for the avoid inadequate deposition of the same, reducing environmental passive.
DOI: 10.6084/m9.figshare.7243736
title: Does mechanical damage on soybean induces the production of flavonoids?

description: Abstract The response of plants to grazing includes the production of chemical defense compounds such as proteases inhibitors and secondary metabolites as flavonoids, which makes them less palatable to feeding and negatively affecting the physiology of insects. The aim of this study was to evaluate the phytochemical response of soybean cultivars (Glycine max (L.) Merrill) resistant (IAC-17, IAC-24) and susceptible (IAC-P1) to insects after mechanical damage. These cultivars were mechanically injured, and after 24 hours samples of these plants were analyzed by HPLC to identify and quantify flavonoids. The flavonoids daidzein, quercetin, and rutin were quantified, with the highest concentration of daidzin in soybean cultivars after mechanical damage. Rutin was biosynthesized by IAC-24. The cultivars IAC-PL1, IAC-17, and IAC-24 did not show a flavonoid response to mechanical damage. The soybean cultivars are not dependent on mechanical damage to produce flavonoids.
DOI: 10.6084/m9.figshare.7243739
title: Interannual and Intraseasonal Variations of the Onset and Demise of the Pre-Wet Season and the Wet Season in the Northern Northeast Brazil

description: Abstract The Northern Northeast Brazil (NNB) has two rainy periods, namely Pre-Wet Season (PWS) and Wet Season (WES), which are usually treated as one system. The precipitation pattern on NNB is influenced by sea surface temperature (SST) anomalies in the Atlantic and Pacific Ocean on interannual timescales particularly by the Interhemispheric Gradient of SST anomalies (IGS) and El Niño Southern Oscillation (ENSO). On intraseasonal time scales, the MJO is especially important. This study investigates the variability of the PWS/WES. The PWS is largely associated with the development of the South America Monsoon System and South Atlantic Convergence Zone (SAMS/SACZ); the onset is depicted by incursion of the SAMS/SACZ northward. Anomalous atmospheric cyclonic circulation over the southeastern Brazil along with easterlies over the northern Tropical Atlantic marks the early onset of the PWS, while easterlies over the southern Tropical Atlantic are related to late onset episodes. The demise of the PWS is significantly associated with propagation of the MJO, specifically during phases 4-5 of the MJO lifecycle. A Rossby wave train in 200-hPa geopotential height with positive anomalies over central-southern Brazil is depicted during transition between PWS and WES.
DOI: 10.7284/135146
title: Gyrocompass data collected during research cruise SKQ201919S using a Sperry NAVIGAT 2100 instrument system onboard the platform RV Sikuliaq

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7243736.v1
title: Does mechanical damage on soybean induces the production of flavonoids?

description: Abstract The response of plants to grazing includes the production of chemical defense compounds such as proteases inhibitors and secondary metabolites as flavonoids, which makes them less palatable to feeding and negatively affecting the physiology of insects. The aim of this study was to evaluate the phytochemical response of soybean cultivars (Glycine max (L.) Merrill) resistant (IAC-17, IAC-24) and susceptible (IAC-P1) to insects after mechanical damage. These cultivars were mechanically injured, and after 24 hours samples of these plants were analyzed by HPLC to identify and quantify flavonoids. The flavonoids daidzein, quercetin, and rutin were quantified, with the highest concentration of daidzin in soybean cultivars after mechanical damage. Rutin was biosynthesized by IAC-24. The cultivars IAC-PL1, IAC-17, and IAC-24 did not show a flavonoid response to mechanical damage. The soybean cultivars are not dependent on mechanical damage to produce flavonoids.
DOI: 10.6084/m9.figshare.7243739.v1
title: Interannual and Intraseasonal Variations of the Onset and Demise of the Pre-Wet Season and the Wet Season in the Northern Northeast Brazil

description: Abstract The Northern Northeast Brazil (NNB) has two rainy periods, namely Pre-Wet Season (PWS) and Wet Season (WES), which are usually treated as one system. The precipitation pattern on NNB is influenced by sea surface temperature (SST) anomalies in the Atlantic and Pacific Ocean on interannual timescales particularly by the Interhemispheric Gradient of SST anomalies (IGS) and El Niño Southern Oscillation (ENSO). On intraseasonal time scales, the MJO is especially important. This study investigates the variability of the PWS/WES. The PWS is largely associated with the development of the South America Monsoon System and South Atlantic Convergence Zone (SAMS/SACZ); the onset is depicted by incursion of the SAMS/SACZ northward. Anomalous atmospheric cyclonic circulation over the southeastern Brazil along with easterlies over the northern Tropical Atlantic marks the early onset of the PWS, while easterlies over the southern Tropical Atlantic are related to late onset episodes. The demise of the PWS is significantly associated with propagation of the MJO, specifically during phases 4-5 of the MJO lifecycle. A Rossby wave train in 200-hPa geopotential height with positive anomalies over central-southern Brazil is depicted during transition between PWS and WES.
DOI: 10.6084/m9.figshare.7243730
title: RECOVERY OF LEAD AND NOBLE METALS AFTER PROCESSING PRINTED CIRCUIT BOARDS FROM CELL PHONES BY LEACHING WITH MIXTURES CONTAINING HYDROGEN FLUORIDE

description: This work examines the leaching of printed circuit boards (PCBs) from cell phones in aqueous solutions containing HF + H2O2 or HF + NaClO under mild experimental conditions. The PCBs were not ground but were previously treated with 6 mol L-1 NaOH at 50 ºC for 1 h to remove their soldering mask. The HF + H2O2 mixtures leached copper and base metals (except lead) at 35-40 ºC, leaving a solid residue containing lead and noble metals. Leaching was fastest (1 h) when HF and H2O2 concentrations were at least 5 mol L-1 and 3 mol L-1, respectively. The processing of the solid residue is also described in detail. It was leached with water at ~90 ºC followed by HNO3aq. at 25 ºC. Lead, palladium and silver were recovered in this order, leaving gold as final solid. After 1 h at 35-40 ºC, 5 mol L-1 HF + 0.3 mol L-1 NaClO mixtures leached the base metals, copper, gold and palladium. Gold was recovered by liquid-liquid extraction with methyl isobutyl ketone. Silver precipitated as chloride. This salt was isolated by leaching with NH3aq. Loss of fluoride ions (as HF) was below 0.5 wt.% after leaching and handling the solid residue.
DOI: 10.6084/m9.figshare.7243733
title: Compound-Specific δ13C of n-Alkanes: Clean-Up Methods Appraisal and Application to Recent Sediments of a Highly Contaminated Bay

description: Different clean-up methods to determine isotopic composition of n-alkanes were tested. Sources of organic matter in Guanabara Bay were re-examined through the δ13C of individual n-alkanes in surface sediment samples. The n-alkanes were efficiently isolated without significant losses of the compounds of interest. The δ13C of n-alkanes (n-C17 to n-C35) ranged between -34.0 and -26.4‰. More depleted δ13C values associated to higher carbon preference index (CPI &gt; 4) suggest prevalence of biogenic n-alkanes from terrestrial origin in the inner stations influenced by inputs from mangrove areas. Small isotopic differences between odd and even-numbered chains and 13C-enrichment in long-chain homologues indicate a petrogenic hydrocarbons contribution. Higher concentrations of short-chain compounds associated to a more 13C-enriched total organic carbon (TOC) were found near the most intense sewage discharges. Results show that δ13C of n-alkanes can be applied to a highly degraded system as the Guanabara Bay and help improve the characterization of the organic matter.
DOI: 10.6084/m9.figshare.7243733.v1
title: Compound-Specific δ13C of n-Alkanes: Clean-Up Methods Appraisal and Application to Recent Sediments of a Highly Contaminated Bay

description: Different clean-up methods to determine isotopic composition of n-alkanes were tested. Sources of organic matter in Guanabara Bay were re-examined through the δ13C of individual n-alkanes in surface sediment samples. The n-alkanes were efficiently isolated without significant losses of the compounds of interest. The δ13C of n-alkanes (n-C17 to n-C35) ranged between -34.0 and -26.4‰. More depleted δ13C values associated to higher carbon preference index (CPI &gt; 4) suggest prevalence of biogenic n-alkanes from terrestrial origin in the inner stations influenced by inputs from mangrove areas. Small isotopic differences between odd and even-numbered chains and 13C-enrichment in long-chain homologues indicate a petrogenic hydrocarbons contribution. Higher concentrations of short-chain compounds associated to a more 13C-enriched total organic carbon (TOC) were found near the most intense sewage discharges. Results show that δ13C of n-alkanes can be applied to a highly degraded system as the Guanabara Bay and help improve the characterization of the organic matter.
DOI: 10.7284/135157
title: INS (Inertial Navigation System) data collected during research cruise SKQ201919S using a Kongsberg Seapath 320+ instrument system onboard the platform RV Sikuliaq

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7243730.v1
title: RECOVERY OF LEAD AND NOBLE METALS AFTER PROCESSING PRINTED CIRCUIT BOARDS FROM CELL PHONES BY LEACHING WITH MIXTURES CONTAINING HYDROGEN FLUORIDE

description: This work examines the leaching of printed circuit boards (PCBs) from cell phones in aqueous solutions containing HF + H2O2 or HF + NaClO under mild experimental conditions. The PCBs were not ground but were previously treated with 6 mol L-1 NaOH at 50 ºC for 1 h to remove their soldering mask. The HF + H2O2 mixtures leached copper and base metals (except lead) at 35-40 ºC, leaving a solid residue containing lead and noble metals. Leaching was fastest (1 h) when HF and H2O2 concentrations were at least 5 mol L-1 and 3 mol L-1, respectively. The processing of the solid residue is also described in detail. It was leached with water at ~90 ºC followed by HNO3aq. at 25 ºC. Lead, palladium and silver were recovered in this order, leaving gold as final solid. After 1 h at 35-40 ºC, 5 mol L-1 HF + 0.3 mol L-1 NaClO mixtures leached the base metals, copper, gold and palladium. Gold was recovered by liquid-liquid extraction with methyl isobutyl ketone. Silver precipitated as chloride. This salt was isolated by leaching with NH3aq. Loss of fluoride ions (as HF) was below 0.5 wt.% after leaching and handling the solid residue.
DOI: 10.6084/m9.figshare.7243724
title: Impact of environmental pollution on the ocular surface of Sjögren’s syndrome patients

description: ABSTRACT Purpose: To evaluate the effect of air pollution on the ocular surface of patients with Sjögren’s syndrome. Methods: We investigated the ocular surfaces of thirty patients with Sjögren’s syndrome and thirty healthy volunteers (control group) living in the Metropolitan Area of Buenos Aires. We used nitrogen dioxide as an indicator of exposure to air pollution. An ocular symptoms questionnaire was answered by all subjects, who also underwent a complete ocular surface ophthalmic examination-including an Ocular Surface Disease Index questionnaire, biomicroscopy, tear breakup time, Schirmer 1 test, corneal and conjunctival vital staining with fluorescein and lissamine green, tear lysozyme concentration, and impression cytology. Results: In almost all ocular surface test findings, we found a positive and significant correlation between higher levels of exposure to air pollution and higher levels of ocular surface damage in both the control group and Sjögren’s syndrome patients. In Sjögren’s syndrome patients, the Ocular Surface Disease Index questionnaire, tear breakup time, vital staining and impression cytology showed a significant correlation between high levels of air pollution and ocular surface disease. In the control group, the Ocular Surface Disease Index questionnaire, tear breakup time, and impression cytology showed a significant correlation between high levels of air pollution and ocular surface disease. Conclusions: Here we demonstrated that in patients with dry eye syndrome associated with Sjögren, abnormalities of the ocular surface and eye irritation related to air pollution are more severe than those in the control group. We believe that measuring air quality should be not only an integral part of the evaluation of ocular surface disease but also a therapeutic consideration.
DOI: 10.6084/m9.figshare.7243727
title: Physical and mechanical properties of Tatajuba wood specie (Bagassa guianensis) from two different Brazilian regions

description: ABSTRACT As a consequence of the edaphoclimatic factors, the properties of the wood can be influenced according to the site of development of the tree. The aim of the research was to verify the influence, in some physical and mechanical properties, of the extraction site of bacthes of Tatajuba wood specie (Bagassa guianensis) from two different regions of Brazil (Alta Floresta and Bonfim do Sul, Mato Grosso and Roraima Brazilian states, respectively) at 12% of moisture content. For each bacthes two physical and five mechanical properties were determined, according to ABNT NBR 7190:1997 Brazilian Code. In order to evaluate the influence of the extraction region on the properties, Kruskal-Wallis analysis of variance was performed, considering significant results (non-equivalent values) for those that met P-value &lt;0.05. According to the results, the different batches of the same wood species presented equivalent average values of the studied properties in relation to the set, but compressive strength parallel to the grain and apparent density average values were not significant between the two sites. The characteristic values of compressive strength parallel to the grain were different for the different batches, at the moisture content of 12%, classified the same species in different strength classes (D50 – Alta Floresta and D60 – Bonfim do Sul).
DOI: 10.7284/135147
title: Meteorological Station data collected during research cruise SKQ201919S using a Vaisala WXT520 instrument system onboard the platform RV Sikuliaq

description: Original (unprocessed) data collected during a Field_expedition