cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.11266718
title: Long-term behavior of mortars produced with sulfide-bearing aggregates

description: ABSTRACT The variety of sulfides (inorganic compounds formed by combining sulfur with a metal element) presented in earth crust is not small, which makes it difficult to avoid the use of sulfide-bearing aggregates in the concrete, especially in places where another source of material is non-existent or economically impracticable, as is the case of dams. Within this scenario, this work presents an evaluation of the long-term behavior of mortar produced with aggregates containing pyrite and pyrrhotite. For the study, rock samples from the Irapé Hydroelectric Power Plant area in Minas Gerais were used. This plant was built in a geological site where the rock presented sulfide levels of at least 3%. These rock samples were first ground and then used as aggregates in mortars, which were, during almost 1300 days, subjected to three different exposed conditions: 1-temperature of 23° ± 2°C and relative humidity of 95 to 100%; 2- submerged in calcium hydroxide solution diluted in water during almost 850 days and then kept in water up to 1300 days, both at room temperature; 3- submerged in calcium hydroxide solution diluted in water at 50° C during almost 850 days and then kept in water (50° C) up to 1300 days. The expansion caused by the iron sulfide oxidation as well as the content of each sulfide were evaluated over time. The presence and amount of pyrrhotite were obtained from a leaching process of the material (aggregate or mortar) in a solution of hydrochloric acid. This procedure allowed also the evaluation of the pyrite content over time. The results showed that the calcium hydroxide solution speeds up the expansion just like the temperature. It was also observed that the amount of pyrite has remained virtually constant over time in the three exposure situations. This finding indicates that sulfur limits in aggregates should be set according to the type of iron sulfide presented and not only by the total amount of sulfur.
DOI: 10.6084/m9.figshare.11266730.v1
title: Genetic assessment of seed yield-related traits in superior hybrids of Paspalum plicatulum × Paspalum guenoarum

description: ABSTRACT This study aimed to estimate the genetic parameters, genetic correlations, genetic dissimilarity, and predicted gains with the selection of interspecific apomictic Paspalum plicatulum × Paspalum guenoarum hybrids in relation to seed yield traits. Nineteen genotypes that showed increased forage yield in previous studies were planted in a randomized complete block design with ten blocks. Traits evaluated in this study were: number of tillers/plant, number of reproductive tillers/plant, number of racemes/inflorescence, number of seeds/inflorescence, weight of a thousand seeds, and seed yield. Data were analyzed using a mixed model approach. The genotypes evaluated in our study showed improvement potential in relation to high heritability (H a 2 &gt; 0.50 ), high precision (Acgen&gt; 90%), and genetic dissimilarity (forming three groups) for seed yield traits. Seed yield showed high correlation to reproductive tillers that can be used as indirect selection tools for genetic improvement of seed yield.
DOI: 10.6084/m9.figshare.11266703
title: Verification of the reaction to fire of water-based and oil-based enamel paints used as finish of walls in residential buildings

description: ABSTRACT Among that materials whose behavior facing fire has not yet been understood thoroughly lie paints used as finish of interior and exterior walls of buildings. This study aimed to analyses the reaction to fire of enamel paints exposed to elevated temperatures, so two paints were tested: one water-based and one oil-based, both applied over a white undercoat designed specifically for this purpose, simulating the real conditions of application. The paints were evaluated regarding their ignitability per ISO 11925-2:2010 and isolated combustion, by EN 13823:2010. Moreover, the enamels were subjected to thermogravimetric analysis with mass spectrometry to assess variations of mass during the temperature increase process. Lastly, a calorific value test was performed with the intent of comparing the values with those from the EN 13823:2010 test. It was noted that the paints evaluated, no matter their chemical composition, do not bolster the development of flames as they reduced smoke release by up to 6.7% and heat release by up to 60.4%, not hindering user safety in room under fire situation. Even more, the paints turned out to be protectors of the substrate
DOI: 10.6084/m9.figshare.11266709
title: Case study on institutional support in the federal management of Primary Health Care in Brazil

description: ABSTRACT The article analyzes the potentialities and the limits of the institutional support function as a strategy to democratize the management of health policies. This aim was investigated in the National Policy of Primary Health Care, in the period between 2011 and 2015. Qualitative epistemology was adopted as methodological perspective, with the use of in-depth interviews, focus groups, and participant observation. The results were assessed through two interpretative cycles. In the first one, of a descriptive nature, we seek to map out assignments, modes of insertion, intervention strategies, and organization of the institutional support work process. In the second cycle, of an analytical nature, the institutional patterns present in this experiment were explored. The theoretical framework of the study was based on the ergological approach and the concept of institution, according to the tradition of French institutionalism. We observed that the institutional support strategy generated and strengthened socio-technical networks articulated in function of the National Policy of Primary Health Care. However, the necessity of implementation of priority programs demands it to be better considered in the design of this management strategy.
DOI: 10.6084/m9.figshare.11266718.v1
title: Long-term behavior of mortars produced with sulfide-bearing aggregates

description: ABSTRACT The variety of sulfides (inorganic compounds formed by combining sulfur with a metal element) presented in earth crust is not small, which makes it difficult to avoid the use of sulfide-bearing aggregates in the concrete, especially in places where another source of material is non-existent or economically impracticable, as is the case of dams. Within this scenario, this work presents an evaluation of the long-term behavior of mortar produced with aggregates containing pyrite and pyrrhotite. For the study, rock samples from the Irapé Hydroelectric Power Plant area in Minas Gerais were used. This plant was built in a geological site where the rock presented sulfide levels of at least 3%. These rock samples were first ground and then used as aggregates in mortars, which were, during almost 1300 days, subjected to three different exposed conditions: 1-temperature of 23° ± 2°C and relative humidity of 95 to 100%; 2- submerged in calcium hydroxide solution diluted in water during almost 850 days and then kept in water up to 1300 days, both at room temperature; 3- submerged in calcium hydroxide solution diluted in water at 50° C during almost 850 days and then kept in water (50° C) up to 1300 days. The expansion caused by the iron sulfide oxidation as well as the content of each sulfide were evaluated over time. The presence and amount of pyrrhotite were obtained from a leaching process of the material (aggregate or mortar) in a solution of hydrochloric acid. This procedure allowed also the evaluation of the pyrite content over time. The results showed that the calcium hydroxide solution speeds up the expansion just like the temperature. It was also observed that the amount of pyrite has remained virtually constant over time in the three exposure situations. This finding indicates that sulfur limits in aggregates should be set according to the type of iron sulfide presented and not only by the total amount of sulfur.
DOI: 10.6084/m9.figshare.11266733.v1
title: Access to treatment of women with breast cancer

description: ABSTRACT This study was aimed at characterizing the access to treatment of women diagnosed with breast cancer in the state of Piauí, Brazil. A cross-sectional analytical study was developed in two referral hospital institutions from January/2018 to June/2018. The population comprised women diagnosed with breast cancer who underwent treatment in the period from 2016 to 2017. The sample amounted to 155 participants. Sampling was proportionally stratified. The data was processed in IBM® SPSS®, and uni and bivariate statistics were calculated. It was noted that the average time for treatment was of 112.7 (± 93.6) days, varying from 12 to 550 days (≡18.3 months or 1.5 years), with 71.6 % of the women starting treatment within a period higher than 60 days following breast cancer diagnosis. Statistically significant associations were verified between the delay to start treatment and the state territory of residence (p = 0.041) and the disease stage (p = 0.037). The conclusion is that women are not having access to breast cancer treatment as recommended. Therefore, it is worth noting the need for greater organization in the network of health services, taking into account the needs of the population through timely health care.
DOI: 10.6084/m9.figshare.11266700
title: Mechanical properties and microstructural analysis of a concrete produced with aggregate from the Brazilian Amazon reg

description: ABSTRACT Due to the scarcity of aggregates in some regions of the Amazon, the present work has the objective of evaluating the properties of concretes produced with aggregate from the bed of the Oiapoque river. A comparative study was carried out comparing the characteristics of the large aggregates used in construction, especially the material found in the Oiapoque river bed in the city of Oiapoque, and the large aggregate from the metropolitan area of Belém. mechanical properties, performance tests and microstructure of concretes. The results showed that the use of the aggregate of arenite origin of the Oiapoque region showed no difference in the compressive strength and modulus of elasticity of the concretes in relation to the concrete produced with aggregate commercially available in the metropolitan area of Belém. the concrete as to the rate of absorption of chlorides over time and neither advance in the front of carbonation. The scanning electron microstructure of the concretes presented a dense microstructure, but usually found in cementitious matrix - based composites. These findings serve as empirical evidence for the validation of the use of an aggregate deposit in the Amazon Region, contributing to the development of infrastructure works in the region.
DOI: 10.6084/m9.figshare.11266703.v1
title: Verification of the reaction to fire of water-based and oil-based enamel paints used as finish of walls in residential buildings

description: ABSTRACT Among that materials whose behavior facing fire has not yet been understood thoroughly lie paints used as finish of interior and exterior walls of buildings. This study aimed to analyses the reaction to fire of enamel paints exposed to elevated temperatures, so two paints were tested: one water-based and one oil-based, both applied over a white undercoat designed specifically for this purpose, simulating the real conditions of application. The paints were evaluated regarding their ignitability per ISO 11925-2:2010 and isolated combustion, by EN 13823:2010. Moreover, the enamels were subjected to thermogravimetric analysis with mass spectrometry to assess variations of mass during the temperature increase process. Lastly, a calorific value test was performed with the intent of comparing the values with those from the EN 13823:2010 test. It was noted that the paints evaluated, no matter their chemical composition, do not bolster the development of flames as they reduced smoke release by up to 6.7% and heat release by up to 60.4%, not hindering user safety in room under fire situation. Even more, the paints turned out to be protectors of the substrate
DOI: 10.6084/m9.figshare.11266709.v1
title: Case study on institutional support in the federal management of Primary Health Care in Brazil

description: ABSTRACT The article analyzes the potentialities and the limits of the institutional support function as a strategy to democratize the management of health policies. This aim was investigated in the National Policy of Primary Health Care, in the period between 2011 and 2015. Qualitative epistemology was adopted as methodological perspective, with the use of in-depth interviews, focus groups, and participant observation. The results were assessed through two interpretative cycles. In the first one, of a descriptive nature, we seek to map out assignments, modes of insertion, intervention strategies, and organization of the institutional support work process. In the second cycle, of an analytical nature, the institutional patterns present in this experiment were explored. The theoretical framework of the study was based on the ergological approach and the concept of institution, according to the tradition of French institutionalism. We observed that the institutional support strategy generated and strengthened socio-technical networks articulated in function of the National Policy of Primary Health Care. However, the necessity of implementation of priority programs demands it to be better considered in the design of this management strategy.
DOI: 10.6084/m9.figshare.11266724.v1
title: Case study of performance evaluation of watertight of mortars and water repellents - Part I

description: ABSTRACT One of the agents that trigger pathological manifestations in buildings is the entrance of fluids and salts into facades degraded by the absence of maintenance throughout their useful life. The present study evaluates the watertight performance of eight mortar coatings, two of which are dosed in construction and seven in-dustrial-ized, and four film-forming water repellent coatings used for the recovery of humidity degraded fa-cades. In situ tests were carried out on a facade degraded by humidity in the city of Santa Maria/RS, perme-ability to liquid water, empirical absorption and evaporation of water, infrared thermography, and tensile adhesion strength. It was concluded that water repellent coatings presented greater efficiency of watertight compared to mortar coatings, when used for the recovery of humidity degraded facades.
DOI: 10.6084/m9.figshare.11266688
title: Prospective elementary teachers' abilities in tackling a contextualized physics problem as guided inquiry

description: Abstract This article presents a qualitative study, with a descriptive and interpretative nature, of the abilities of prospective elementary teachers (PETs) to solve a contextualized problem of physics through a process of guided inquiry. Specifically, an analysis was made of the PETs' abilities to (a) formulate hypotheses; (b) plan inquiry procedures aimed at testing hypotheses; and (c) draw conclusions from the inquiry (i.e., interpret experimental data to accept or reject their hypotheses, and recognize the limitations of the inquiry that they had conducted). The study participants were 17 PETs who were receiving training in science teaching. They were organized into small groups to solve the physics problem proposed to them. The study's data were extracted from the inquiry reports that the groups prepared by following a script with open-ended questions. The results revealed the PETs' strengths and weaknesses in addressing the different scientific practices that had been required in the process, as well as showing that they all had achieved some improvement in their inquiry abilities after completing the activity. A discussion of the results is given with a view to improving the training of PETs in inquiry-based science learning.
DOI: 10.6084/m9.figshare.11266700.v1
title: Mechanical properties and microstructural analysis of a concrete produced with aggregate from the Brazilian Amazon reg

description: ABSTRACT Due to the scarcity of aggregates in some regions of the Amazon, the present work has the objective of evaluating the properties of concretes produced with aggregate from the bed of the Oiapoque river. A comparative study was carried out comparing the characteristics of the large aggregates used in construction, especially the material found in the Oiapoque river bed in the city of Oiapoque, and the large aggregate from the metropolitan area of Belém. mechanical properties, performance tests and microstructure of concretes. The results showed that the use of the aggregate of arenite origin of the Oiapoque region showed no difference in the compressive strength and modulus of elasticity of the concretes in relation to the concrete produced with aggregate commercially available in the metropolitan area of Belém. the concrete as to the rate of absorption of chlorides over time and neither advance in the front of carbonation. The scanning electron microstructure of the concretes presented a dense microstructure, but usually found in cementitious matrix - based composites. These findings serve as empirical evidence for the validation of the use of an aggregate deposit in the Amazon Region, contributing to the development of infrastructure works in the region.
DOI: 10.6084/m9.figshare.11266688.v1
title: Prospective elementary teachers' abilities in tackling a contextualized physics problem as guided inquiry

description: Abstract This article presents a qualitative study, with a descriptive and interpretative nature, of the abilities of prospective elementary teachers (PETs) to solve a contextualized problem of physics through a process of guided inquiry. Specifically, an analysis was made of the PETs' abilities to (a) formulate hypotheses; (b) plan inquiry procedures aimed at testing hypotheses; and (c) draw conclusions from the inquiry (i.e., interpret experimental data to accept or reject their hypotheses, and recognize the limitations of the inquiry that they had conducted). The study participants were 17 PETs who were receiving training in science teaching. They were organized into small groups to solve the physics problem proposed to them. The study's data were extracted from the inquiry reports that the groups prepared by following a script with open-ended questions. The results revealed the PETs' strengths and weaknesses in addressing the different scientific practices that had been required in the process, as well as showing that they all had achieved some improvement in their inquiry abilities after completing the activity. A discussion of the results is given with a view to improving the training of PETs in inquiry-based science learning.
DOI: 10.6084/m9.figshare.11266694
title: Analysis of the potential use of landfill biogas energy and simulation of greenhouse gas emissions of different municipal solid waste management scenarios in Varginha, MG, Brazil

description: ABSTRACT The present work proposes to evaluate the economic and environmental viability of energy recovery from biogas in the landfill of Varginha-MG, as well to analyze greenhouse gas emissions (GHG) and energy consumption in different scenarios of municipal solid waste (MSW) management. A 20-year projection of MSW generation and landfill operation were considered, whose biogas production was estimated through LandGEM software. The economic feasibility analysis was performed using the net present value (NPV), and the internal rate of return (IRR) as indicators. GHG emissions were estimated by applying the WARM model (Waste Reduction Model) considering the current MSW management scenario and three alternative ones. The scenarios diversified into recycling strategies, anaerobic digestion, landfill disposal and incineration with energy recovery. Only the energy recovery with a power of 150 kW resulted in economic viability. Moreover, the largest environmental benefits were obtained by scenario 3, based on the recovery of recyclable materials, anaerobic digestion and incineration of MSW, considerably reducing the volume of MSW landfilled. Among all management practices of the proposed scenarios, recycling resulted in greater energy gains and GHG emission removal.
DOI: 10.6084/m9.figshare.11266667
title: Effect of addition of glass waste on masonry ceramics

description: ABSTRACT This work investigated the effect of the addition of glass waste to the manufacture of masonry ceramics. Was conformed cylindrical samples with 27 mm in diameter by 45 mm in height were made from the standard mass of a hard clay ceramic industry and other 3 formulations (5, 10 and 20 %) with glass incorporation, based on studies presented in the literature. The heat treatment was carried out in a muffle at three temperatures (800, 900 and 1000 °C). The technological properties evaluated were: linear drying shrinkage and linear firing shrinkage, water absorption, fire loss and mechanical resistance to compression. It was observed that the drying retraction decreased from 7.9 to 5.9 % with the increase of the glass content added. The addition of glass waste to the ceramic mass did not significantly interfere with the retraction of burning at 800 and 900 °C, but increased significantly at 1000 °C, as well as water absorption was reduced considerably at 1000 °C. The addition of glass waste reduces the resistance to compression of the ceramic pieces by up to 4.4 MPa, but the values found were within the established by norm. The composition with addition of 20 % of sintered glass waste at 900 °C reached a value of 6 MPa, value greater than 1,5 MPa for standard to hollow ceramic block for non-load-bearing. At 1000 °C was observed the occurrence of overfiring, which leads to the appearance of bubbles and deformation. The addition of up to 20 % of glass residue to the ceramic mass for sintered masonry at 900 °C presents values acceptable by the Brazilian standard, of the technological properties evaluated, with the advantage of reducing the tendency to cracks and dimensional variation, besides contributing to the reduction of the use of virgin raw materials and of giving a sustainable destination to a waste.
DOI: 10.6084/m9.figshare.11266652
title: Evaluating the validity of the new version of Test of Understanding Graphs in Kinematics (TUG-K) with high school students

description: Abstract In order to verify the kinematics graphs comprehension for a group of high school students, it is recommended to use an instrument that has a content valid by experts and a statistical validation. In this sense, was chosen the updated version of Test of Understanding Graphs in Kinematics (TUG-K), proposed in 2017 by Zavala and originally created by Beichner, in 1994. The TUG-K was elaborated to measure the understanding of graphs in kinematics of university students, mostly. Therefore, for this test to be used in basic education, it is necessary to know if it has statistical validity in this context. Consequently, a statistical analysis of the test was performed, after being applied at two different moments, with upper secondary level students of a federal school in Rio de Janeiro. The measured parameters were the same used by Zavala. The main result of this article was to demonstrate that TUG-K validity in this group. As a complement, it was shown that Hake's normalized learning gain from this group of students exposed to kinematics lectures was 17%, a value that is expected to be in traditional teaching. The underlying perspective is to disseminate and encourage the use of TUG-K in high school.