cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.6858200
title: Biometric Responses of Soybean to Different Potassium Fertilization Management Practices in Years with High and Low Precipitation

description: ABSTRACT Brazilian soybean producers commonly apply maintenance potassium (K) fertilization during cultivation to restore the K taken up by plants; however, this measure can modify the morphophysiological plant characteristics, since the functions of K are closely related with plant growth and development. This study assessed the morphological changes in soybean plants in response to K rates, sowing fertilization, and the application periods of K fertilization in a Latossolo Vermelho eutroférrico (Oxisol) under a no-tillage system, located in the municipality of Floresta, Paraná. A randomized block design was used in the experiment with four replications in a fully crossed factorial design (5 × 2 × 2). The experiment was carried out in two growing seasons (2015/2016 and 2016/2017), with a total of 80 experimental units. The rates corresponded to the first factor (0, 40, 80, 120, and 160 kg ha-1 of K). The application periods (pre-sowing and post-sowing) were the second factor, and sowing fertilization (0 and 30 kg ha-1 of K) the third. The following variables were measured: shoot dry weight, leaf dry weight, stem dry weight, leaf area, specific leaf area, leaf area ratio, and leaf area index, and these biometric parameters were correlated with soybean yield. The results showed that plants well-supplied with K exploited the environment better and this may be reversed for higher yields since there were correlations between grain yield and the biometric parameters. At lower water availability, the biometric changes were more evident.
DOI: 10.6084/m9.figshare.6858200.v1
title: Biometric Responses of Soybean to Different Potassium Fertilization Management Practices in Years with High and Low Precipitation

description: ABSTRACT Brazilian soybean producers commonly apply maintenance potassium (K) fertilization during cultivation to restore the K taken up by plants; however, this measure can modify the morphophysiological plant characteristics, since the functions of K are closely related with plant growth and development. This study assessed the morphological changes in soybean plants in response to K rates, sowing fertilization, and the application periods of K fertilization in a Latossolo Vermelho eutroférrico (Oxisol) under a no-tillage system, located in the municipality of Floresta, Paraná. A randomized block design was used in the experiment with four replications in a fully crossed factorial design (5 × 2 × 2). The experiment was carried out in two growing seasons (2015/2016 and 2016/2017), with a total of 80 experimental units. The rates corresponded to the first factor (0, 40, 80, 120, and 160 kg ha-1 of K). The application periods (pre-sowing and post-sowing) were the second factor, and sowing fertilization (0 and 30 kg ha-1 of K) the third. The following variables were measured: shoot dry weight, leaf dry weight, stem dry weight, leaf area, specific leaf area, leaf area ratio, and leaf area index, and these biometric parameters were correlated with soybean yield. The results showed that plants well-supplied with K exploited the environment better and this may be reversed for higher yields since there were correlations between grain yield and the biometric parameters. At lower water availability, the biometric changes were more evident.
DOI: 10.6084/m9.figshare.6858197.v1
title: Enhanced settling of mature fine tailings (MFT) by paramagnetic nanofluids based on nanoiron

description: ABSTRACT The extraction of bitumen from sand by utilizing hot water processes results in the production of a slurry waste which is stored in so called “tailings ponds”. Within these ponds, while fast settling sand particles segregate from the slurry in relatively short time, the fines fraction accumulates in the center of the pond and then settles, becoming mature fine tailings (MFT). Most of the water content of the pond is recycled back, however around 86% of the volume of MFT consist of water and it cannot be recycled. It takes a few years after placement for MFT to settle to around 35% solids. By 2008 there were about 750 million cubic meters of MFT within the tailing ponds. Assuming the tailing management remains the same, the amount of fluid tailings is expected to reach two billion cubic meters by 2034. In 2009 it was estimated that there were around 130 square kilometers of tailings ponds in the oil sand region at Canada. Thus, one of the most important environmental challenges regarding oil sands mining is developing a process to separate water from the fine tailings within a reasonable time frame, in order to allow for the reclamation of the site. Bearing in mind these problems we initiated a preliminary applied research program in order to prove the concept of speeding up sedimentation of MFT by means of nanoparticles, and more specifically by using paramagnetic nanofluids manufactured with these nanoparticles. This preliminary series of tests proved that the concept of enhancing settling of MFT by means of paramagnetic nanofluids is feasible. Clarification of samples treated with magnetic nanoparticles achieved a 50% value as compared to only a 10% clarification in the same lapse for untreated samples, while dosage of conventional flocculants resulted in erratic behavior.
DOI: 10.6084/m9.figshare.6858191
title: Evaluación reológica de fluidos de perforación base agua con nanosílice

description: ABSTRACT Generally, drilling fluids may be defined as fluids with a composition that can assist the generation and removal of cuttings from the borehole to the surface. They are classified according to their base as water based mud (WBM), oil based mud (OBM) or gas. Polymers, densifiers, brines, surfactants, among others are the primary components of drilling fluids. Currently the trend is to develop WBMs, which simulate the high performance of OBMs, with benefits such as reduction of environmental impacts and lower costs associated with cuttings and fluids disposal. This challenge introduces high performance materials in the oil industry such as nanomaterials. The increasing demand of hydrocarbons has led the study and production of unconventional resources in Argentina and worldwide like shale and tight reservoirs. Shales are sedimentary rocks composed of clay size particles and organic matter with laminar structure, low permeability and nanopores. In these types of rocks wellbore stability and shale inhibition are key factors while drilling with WBM, so it is necessary to avoid pore pressure increase and subsequent penetration of drilling fluid into the formation. In this research nanosilica (12nm) was used to minimize shale permeability through physically plugging the nanopores of shales which are of 30 nm as average. This nanomaterial will minimize not only fluid penetration, pore pressure, shale permeability and fluid-rock interaction but will improve wellbore stability. In this work the rheological behavior of WBM with nanoparticles was analyzed. Fluids were prepared with the same additives and composition as the ones used in argentine fields. Finally, the rheological behavior of WBM was compared with the OBM´s and the best concentration of nanosilica was determined: 0,5 %p/p. Also, filtration and inhibition tests were performed in agreement with API 13B1-2 and API 13I.
DOI: 10.6084/m9.figshare.6858194
title: Workplace bullying, gender, race and power: a review

description: Abstract Introduction: workplace bullying (WB) is considered violence based on humiliation, aggressions, psychological terror and abuse of power that interferes with workers’ health and the course of their careers. Objective: to analyze Brazilian scientific production on WB within the Health and Education fields considering gender, race and power relations. Method: integrative review using SciELO, Virtual Health Library-Regional Portal, PubMed, Scopus and Web of Science databases. After analysis of 249 studies, published from 2006 to 2016, 20 articles were selected. Results: there is shortage of research that has gender and race as central categories; the studies points at the need for investigations into sexual harassment experienced by women; organization, working conditions and power relations were pointed out as central to the WB experiences. Conclusion: the findings reiterated the influence of WB on workers’ health, their family life and career development, and indicated the need to have the race and gender categories integrated into scientific investigations. Preventive programs and specific laws are recommended to avoid occupational and gender violences, and racism.
DOI: 10.6084/m9.figshare.6858191.v1
title: Evaluación reológica de fluidos de perforación base agua con nanosílice

description: ABSTRACT Generally, drilling fluids may be defined as fluids with a composition that can assist the generation and removal of cuttings from the borehole to the surface. They are classified according to their base as water based mud (WBM), oil based mud (OBM) or gas. Polymers, densifiers, brines, surfactants, among others are the primary components of drilling fluids. Currently the trend is to develop WBMs, which simulate the high performance of OBMs, with benefits such as reduction of environmental impacts and lower costs associated with cuttings and fluids disposal. This challenge introduces high performance materials in the oil industry such as nanomaterials. The increasing demand of hydrocarbons has led the study and production of unconventional resources in Argentina and worldwide like shale and tight reservoirs. Shales are sedimentary rocks composed of clay size particles and organic matter with laminar structure, low permeability and nanopores. In these types of rocks wellbore stability and shale inhibition are key factors while drilling with WBM, so it is necessary to avoid pore pressure increase and subsequent penetration of drilling fluid into the formation. In this research nanosilica (12nm) was used to minimize shale permeability through physically plugging the nanopores of shales which are of 30 nm as average. This nanomaterial will minimize not only fluid penetration, pore pressure, shale permeability and fluid-rock interaction but will improve wellbore stability. In this work the rheological behavior of WBM with nanoparticles was analyzed. Fluids were prepared with the same additives and composition as the ones used in argentine fields. Finally, the rheological behavior of WBM was compared with the OBM´s and the best concentration of nanosilica was determined: 0,5 %p/p. Also, filtration and inhibition tests were performed in agreement with API 13B1-2 and API 13I.
DOI: 10.6084/m9.figshare.6858194.v1
title: Workplace bullying, gender, race and power: a review

description: Abstract Introduction: workplace bullying (WB) is considered violence based on humiliation, aggressions, psychological terror and abuse of power that interferes with workers’ health and the course of their careers. Objective: to analyze Brazilian scientific production on WB within the Health and Education fields considering gender, race and power relations. Method: integrative review using SciELO, Virtual Health Library-Regional Portal, PubMed, Scopus and Web of Science databases. After analysis of 249 studies, published from 2006 to 2016, 20 articles were selected. Results: there is shortage of research that has gender and race as central categories; the studies points at the need for investigations into sexual harassment experienced by women; organization, working conditions and power relations were pointed out as central to the WB experiences. Conclusion: the findings reiterated the influence of WB on workers’ health, their family life and career development, and indicated the need to have the race and gender categories integrated into scientific investigations. Preventive programs and specific laws are recommended to avoid occupational and gender violences, and racism.
DOI: 10.6084/m9.figshare.6858188
title: Supplementation of broiler breeders with fat sources and vitamin e: carry over effect on performance, carcass yield, and meat quality offspring

description: ABSTRACT The aim of this study was to evaluate two sources of oil (soybean and fish) and four additional levels of vitamin E (0, 150, 250 and 350mg/kg diet) in breeder diets between the 42nd and 56th week of age and its effect on performance and meat quality of offspring. The supplementation of fish oil in the maternal diet increased the deposition of DHA and CLA in egg yolk. From 1 to 35 days of age, intermediate levels of vitamin E resulted in lower weight gain and feed intake. To feed conversion, the best result was obtained supplementing the maternal diet with soybean oil, regardless of vitamin inclusion. In addition, the evaluation of meat quality, the fish oil-supplemented-diet resulted in lower moisture loss of the breast fillets. For maternal diet supplemented with fish oil, the inclusion of vitamin E resulted in a linear increase of the pH value of the meat. Greater levels of vitamin E in the maternal diet influenced the functional properties of meat according to the type of oil that was added to the diet. The deposition of different fatty acids in the embryonic egg yolk can directly influence the meat quality of offspring.
DOI: 10.6084/m9.figshare.6858188.v1
title: Supplementation of broiler breeders with fat sources and vitamin e: carry over effect on performance, carcass yield, and meat quality offspring

description: ABSTRACT The aim of this study was to evaluate two sources of oil (soybean and fish) and four additional levels of vitamin E (0, 150, 250 and 350mg/kg diet) in breeder diets between the 42nd and 56th week of age and its effect on performance and meat quality of offspring. The supplementation of fish oil in the maternal diet increased the deposition of DHA and CLA in egg yolk. From 1 to 35 days of age, intermediate levels of vitamin E resulted in lower weight gain and feed intake. To feed conversion, the best result was obtained supplementing the maternal diet with soybean oil, regardless of vitamin inclusion. In addition, the evaluation of meat quality, the fish oil-supplemented-diet resulted in lower moisture loss of the breast fillets. For maternal diet supplemented with fish oil, the inclusion of vitamin E resulted in a linear increase of the pH value of the meat. Greater levels of vitamin E in the maternal diet influenced the functional properties of meat according to the type of oil that was added to the diet. The deposition of different fatty acids in the embryonic egg yolk can directly influence the meat quality of offspring.
DOI: 10.6084/m9.figshare.6858182
title: Ab-initio study of structural, elastic and electronic properties of core/shell nanowires

description: ABSTRACT This Zinc oxide (ZnO) is widely used in different electronic devices due to its thermal, electronic, and piro-piezoelectric properties. Some of these properties are noticeable improvement at the nanoscale, specially when ZnO together with other material create heterostructures. Recently, core/shell nanowires have been synthesized in order to raise the performance in devices like piezo-electronic sensors, photovoltaic cells, and optoelectronic devices. In this work, we introduce a theoretical study of structural, elastic and electronic properties of core/shell nanostructures of ZnO/X (X=ZnS, BeO) when they are subjected to uniaxial stresses in the [0001] direction. Hexagonal nanowires, whose diameters range from 1.5 to 2.8 nm, were ab-initio studied using the density functional theory, in the generalized gradient approximation (GGA), implemented in the SIESTA code. By applying uniaxial stresses, we calculated the Young modulus, maximum tensile, and both total (TDOS) and projected electronic density of states (PDOS). We have observed a degradation in the mechanical properties of core/shell nanowires with respect to ZnO nanowires. Depending on the external shells (BeO or ZnS), the core/shell nanowires became more insulator or more semiconductor. These results are important in nano electronic devices based on ZnO, in order to tailor their optoelectronic properties.
DOI: 10.6084/m9.figshare.6858179
title: Peirce’s Primary Arithmetics: a brief presentation and some remarks on the translation of these manuscripts to Portuguese

description: Abstract This paper aims to present the five manuscripts of the so-called Peirce’s Primary Arithmetics (Lydia Peirce’s Primary Arithmetic; Primary Arithmetic (with suggestions to teachers); Peirce’s Primary Arithmetic upon the psychological method; C.S.Peirce’s Vulgar Arithmetic: its main features, and Practical Arithmetic) and to sketch some remarks on the process of translating such manuscripts to Portuguese. This article is the last study related to some initial and brief hermeneutics already started in the other articles published by the same authors.
DOI: 10.6084/m9.figshare.6858182.v1
title: Ab-initio study of structural, elastic and electronic properties of core/shell nanowires

description: ABSTRACT This Zinc oxide (ZnO) is widely used in different electronic devices due to its thermal, electronic, and piro-piezoelectric properties. Some of these properties are noticeable improvement at the nanoscale, specially when ZnO together with other material create heterostructures. Recently, core/shell nanowires have been synthesized in order to raise the performance in devices like piezo-electronic sensors, photovoltaic cells, and optoelectronic devices. In this work, we introduce a theoretical study of structural, elastic and electronic properties of core/shell nanostructures of ZnO/X (X=ZnS, BeO) when they are subjected to uniaxial stresses in the [0001] direction. Hexagonal nanowires, whose diameters range from 1.5 to 2.8 nm, were ab-initio studied using the density functional theory, in the generalized gradient approximation (GGA), implemented in the SIESTA code. By applying uniaxial stresses, we calculated the Young modulus, maximum tensile, and both total (TDOS) and projected electronic density of states (PDOS). We have observed a degradation in the mechanical properties of core/shell nanowires with respect to ZnO nanowires. Depending on the external shells (BeO or ZnS), the core/shell nanowires became more insulator or more semiconductor. These results are important in nano electronic devices based on ZnO, in order to tailor their optoelectronic properties.
DOI: 10.6084/m9.figshare.6858179.v1
title: Peirce’s Primary Arithmetics: a brief presentation and some remarks on the translation of these manuscripts to Portuguese

description: Abstract This paper aims to present the five manuscripts of the so-called Peirce’s Primary Arithmetics (Lydia Peirce’s Primary Arithmetic; Primary Arithmetic (with suggestions to teachers); Peirce’s Primary Arithmetic upon the psychological method; C.S.Peirce’s Vulgar Arithmetic: its main features, and Practical Arithmetic) and to sketch some remarks on the process of translating such manuscripts to Portuguese. This article is the last study related to some initial and brief hermeneutics already started in the other articles published by the same authors.
DOI: 10.6084/m9.figshare.6858173
title: First evaluation of semidirect recycling methods for the reclamation of cemented carbides based on a literature survey

description: ABSTRACT At the moment the industrially applied techniques for cemented carbide reclamation feature several deficiencies. Depending on the process route, obstacles consist in high energy and chemical consumption (indirect recycling methods) or a deterioration of the recycled product in comparison with the primary material (direct recycling approach). Therefore, an alternative middle course provided by semidirect recycling processes seems promising. Accordingly, the coating materials as well as the binder metals are leached off the substrate keeping the hard phase unaffected and ready for reuse. However, the literature reports various difficulties like the slow dissolution of the binder, particularly if the scrap consists of larger pieces, contains a low binder metal perecentage or a small grain size. Furthermore, oxidation of the cemented tungsten occurs as an undesired reaction, causing even slower lixiviation and a contamination of the recycled product. Due the fact of an inexistent comparable systematic analysis of the semidirect recycling procedures, this article deals with a primary screening of potential combinations of acids, additives and oxidizing agents found in a literature survey. All experiments took place under the same conditions in a temperature controlled double-walled reaction vessel, varying only the molar concentrations of the different species as used in literature. A crucial point comprised of the development of an appropriate sample preparation, which allowed a simplification of the analysis along with its applicability in future kinetic investigations of selected solutions. As a result, promising combinations of chemicals are ready for further investigations determined by penetration depth and abrasion of the hard metal substrate. Successfully applied mixtures incorporate acids such as HNO3 and HCl followed by some organic acids, all combined with H2O2 as oxidant.
DOI: 10.6084/m9.figshare.6858170
title: Cotton and fiber quality in function of picker harvest speed

description: ABSTRACT Cotton price is determined by the quality of the fiber, which can be damaged at the time of harvest, in addition to quantitative losses of non-harvested plume. Therefore, this study aimed to analyse soil and plant losses, and the quality of cotton fiber in relation to five harvest speeds (5, 6, 7, 8, and 9 km h-1) in the spindle system (picker). The experiment was conducted in Lucas do Rio Verde, Mato Grosso, Brazil. A randomized complete block design was used on plots of 0.9 ha, with 20 plot, five speeds, and four blocks. The results showed that the studied speeds did not significantly influence losses on the soil and plant, or the quality of the cotton fiber; therefore, the highest speed may be recommended.
DOI: 10.6084/m9.figshare.6858173.v1
title: First evaluation of semidirect recycling methods for the reclamation of cemented carbides based on a literature survey

description: ABSTRACT At the moment the industrially applied techniques for cemented carbide reclamation feature several deficiencies. Depending on the process route, obstacles consist in high energy and chemical consumption (indirect recycling methods) or a deterioration of the recycled product in comparison with the primary material (direct recycling approach). Therefore, an alternative middle course provided by semidirect recycling processes seems promising. Accordingly, the coating materials as well as the binder metals are leached off the substrate keeping the hard phase unaffected and ready for reuse. However, the literature reports various difficulties like the slow dissolution of the binder, particularly if the scrap consists of larger pieces, contains a low binder metal perecentage or a small grain size. Furthermore, oxidation of the cemented tungsten occurs as an undesired reaction, causing even slower lixiviation and a contamination of the recycled product. Due the fact of an inexistent comparable systematic analysis of the semidirect recycling procedures, this article deals with a primary screening of potential combinations of acids, additives and oxidizing agents found in a literature survey. All experiments took place under the same conditions in a temperature controlled double-walled reaction vessel, varying only the molar concentrations of the different species as used in literature. A crucial point comprised of the development of an appropriate sample preparation, which allowed a simplification of the analysis along with its applicability in future kinetic investigations of selected solutions. As a result, promising combinations of chemicals are ready for further investigations determined by penetration depth and abrasion of the hard metal substrate. Successfully applied mixtures incorporate acids such as HNO3 and HCl followed by some organic acids, all combined with H2O2 as oxidant.