cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.6151901
title: Creep Fracture Mechanisms and Maps in Aisi Type 316 Austenitic Stainless Steels from Distinct Origins

description: Two distinct AISI type 316 stainless steels, of Brazilian and Swedish origins, were compared regarding their creep fracture mechanisms at 600, 700 and 800°C. The possible mechanisms associated with the creep fracture strength were identified by means of fracture maps proposed either by Ashby and collaborators or by Miller and Langdon. Experimental creep results were consistent with the general Ashby and collaborators map for face centered cubic alloys. By contrast, the two different 316 steel displayed significant differences in the model-based map of Miller and Langdon. In the present work, changes in the maps frontier are proposed as well as the introduction of a new field in the map related to grain boundary precipitation. These propositions allowed the Miller and Langdon map to be coherent with the experimental creep fracture results of both 316 stainless steels.
DOI: 10.6084/m9.figshare.6151898
title: Metallic Glass Formation Upon Rapid Solidification of Fe60Cr8Nb8B24 (at%) Alloy through LASER Cladding and Remelting

description: Fe60Cr8Nb8B24 (at%) amorphous powder and ingot were submitted to LASER cladding and remelting process, respectively. Fe-based coatings were produced using different LASER processing parameters and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Vickers microhardness. All coatings obtained by LASER cladding (LC) and layers obtained by LASER surface remelting (LSR) with shorter and median interaction times (scanning speeds of 16.7 and 66.7mm/s), irrespective of overlap value, presented peaks of the crystalline phases α-Fe, Fe2B and the FeNbB intermetallic. In addition, layers obtained by LSR with shorter interaction time (150mm/s), in general, presented only peaks of the α-Fe and Fe2B phases, except that produced with overlap value of 20%, more amorphous. SEM results showed that, regardless of LASER process, the coatings presented cracks, some pores and FeNbB intermetallic phase. All coatings obtained by LC and that obtained with shorter interaction time, by LSR, showed a Vickers microhardness, 1086 to 1329HV and 2161 to 2294HV, respectively, significantly higher than the substrates, AISI steel: 170HV and Fe-Cr-Nb-B: 1921HV.
DOI: 10.6084/m9.figshare.6151898.v1
title: Metallic Glass Formation Upon Rapid Solidification of Fe60Cr8Nb8B24 (at%) Alloy through LASER Cladding and Remelting

description: Fe60Cr8Nb8B24 (at%) amorphous powder and ingot were submitted to LASER cladding and remelting process, respectively. Fe-based coatings were produced using different LASER processing parameters and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Vickers microhardness. All coatings obtained by LASER cladding (LC) and layers obtained by LASER surface remelting (LSR) with shorter and median interaction times (scanning speeds of 16.7 and 66.7mm/s), irrespective of overlap value, presented peaks of the crystalline phases α-Fe, Fe2B and the FeNbB intermetallic. In addition, layers obtained by LSR with shorter interaction time (150mm/s), in general, presented only peaks of the α-Fe and Fe2B phases, except that produced with overlap value of 20%, more amorphous. SEM results showed that, regardless of LASER process, the coatings presented cracks, some pores and FeNbB intermetallic phase. All coatings obtained by LC and that obtained with shorter interaction time, by LSR, showed a Vickers microhardness, 1086 to 1329HV and 2161 to 2294HV, respectively, significantly higher than the substrates, AISI steel: 170HV and Fe-Cr-Nb-B: 1921HV.
DOI: 10.6084/m9.figshare.6151895
title: What should we consider to correctly define the terms distance learning, e-learning, and m-learning?

description: ABSTRACT Research, as related to distance learning, encounters difficulties when comparing studies of definitions, insofar as they are broad, are associated with different contexts and interests of some authors, and often incomplete and lacking in rigor. These definitions must be clarified, ordered and defined correctly. I have reviewed more than sixty articles that involve the three concepts and found a way to consider building them correctly. I have identified a set of characteristics and sub-characteristics that I recommend all interested parties to consider for the correct construction of the definitions of distance learning, e-learning, and m-learning.
DOI: 10.6084/m9.figshare.6151895.v1
title: What should we consider to correctly define the terms distance learning, e-learning, and m-learning?

description: ABSTRACT Research, as related to distance learning, encounters difficulties when comparing studies of definitions, insofar as they are broad, are associated with different contexts and interests of some authors, and often incomplete and lacking in rigor. These definitions must be clarified, ordered and defined correctly. I have reviewed more than sixty articles that involve the three concepts and found a way to consider building them correctly. I have identified a set of characteristics and sub-characteristics that I recommend all interested parties to consider for the correct construction of the definitions of distance learning, e-learning, and m-learning.
DOI: 10.6084/m9.figshare.6151892
title: The visual inversion of depth perception in the schizophrenia

description: ABSTRACT Objective To review the scientific literature on the visual inversion of depth in schizophrenia. Methods A search was made on the main indexers with the descriptors related to schizophrenia, visual perception of depth and illusion of the concave mask. Result Twelve studies involving individuals with schizophrenia and visual depth inversion were found. Conclusion There is a need for more research that collects more information in order to delimit under what conditions the visual inversion of depth occurs or not in individuals with schizophrenia.
DOI: 10.6084/m9.figshare.6151889
title: Effect of the Addition of Carnauba Wax on Physicochemical Properties of Chitosan Films

description: Films and edible coatings of natural polymers have been proposed as an attractive alternative for conventional plastic packaging because of their excellent biodegradability and biocompatibility. However, natural polymers, like chitosan, are hydrophilic and present poor water barrier properties. The addition of wax or other hydrophobic substances decreases water permeability of natural polymers but can increases their opacity.The objective of this work was to produce biofilms based on chitosan and different concentrations of carnauba wax and analyze their optical and barrier properties. The films were obtained by dissolving chitosan in acetic acid. Carnauba wax was incorporated into film-forming solutions at0, 15, 30, 40 and 50% (w/w). The opacity increased with higher concentrations of wax, the film with 50% of wax showed the highest value with an increase of 10.5% compared to the control film. The water vapor permeability decreased from 2.73 g.mm/kPa.m2.h (0% of wax) to 0.77 g.mm/h.kPa.m2 (40% of wax). The solubility decreased to about 60% over the control films, and the contact angle increased from 53º to 83º, in film with 0 and 50% of wax, respectively.
DOI: 10.6084/m9.figshare.6151892.v1
title: The visual inversion of depth perception in the schizophrenia

description: ABSTRACT Objective To review the scientific literature on the visual inversion of depth in schizophrenia. Methods A search was made on the main indexers with the descriptors related to schizophrenia, visual perception of depth and illusion of the concave mask. Result Twelve studies involving individuals with schizophrenia and visual depth inversion were found. Conclusion There is a need for more research that collects more information in order to delimit under what conditions the visual inversion of depth occurs or not in individuals with schizophrenia.
DOI: 10.6084/m9.figshare.6151889.v1
title: Effect of the Addition of Carnauba Wax on Physicochemical Properties of Chitosan Films

description: Films and edible coatings of natural polymers have been proposed as an attractive alternative for conventional plastic packaging because of their excellent biodegradability and biocompatibility. However, natural polymers, like chitosan, are hydrophilic and present poor water barrier properties. The addition of wax or other hydrophobic substances decreases water permeability of natural polymers but can increases their opacity.The objective of this work was to produce biofilms based on chitosan and different concentrations of carnauba wax and analyze their optical and barrier properties. The films were obtained by dissolving chitosan in acetic acid. Carnauba wax was incorporated into film-forming solutions at0, 15, 30, 40 and 50% (w/w). The opacity increased with higher concentrations of wax, the film with 50% of wax showed the highest value with an increase of 10.5% compared to the control film. The water vapor permeability decreased from 2.73 g.mm/kPa.m2.h (0% of wax) to 0.77 g.mm/h.kPa.m2 (40% of wax). The solubility decreased to about 60% over the control films, and the contact angle increased from 53º to 83º, in film with 0 and 50% of wax, respectively.
DOI: 10.6084/m9.figshare.6151886
title: The teaching and learning of human anatomy: the assessment of student performance after the use of concept maps as a pedagogical strategy

description: Abstract The aim of this study was to implement and evaluate the impact of the development of Concept Maps (MC), as a pedagogical strategy in teaching of Human Anatomy, one of the course subjects of Physical Therapy, from Federal University of Minas Gerais (UFMG). A total of 298 students, enrolled regularly, participated of the study over six semesters. The mean analysis of the final scores of the students, prior to the expansion of the MC Project, showed decrease of average score over the semester, which was reversed when the MC were implemented systematically. The implementation of MC were also capable of promoting a significant reduction in the failure rate. Thus, we conclude that the use of MC seems to have contributed to improving student performance and also the approval rating in the discipline of Anatomy, especially after the systematization of its use by the Teaching Project supported by the institution.
DOI: 10.6084/m9.figshare.6151886.v1
title: The teaching and learning of human anatomy: the assessment of student performance after the use of concept maps as a pedagogical strategy

description: Abstract The aim of this study was to implement and evaluate the impact of the development of Concept Maps (MC), as a pedagogical strategy in teaching of Human Anatomy, one of the course subjects of Physical Therapy, from Federal University of Minas Gerais (UFMG). A total of 298 students, enrolled regularly, participated of the study over six semesters. The mean analysis of the final scores of the students, prior to the expansion of the MC Project, showed decrease of average score over the semester, which was reversed when the MC were implemented systematically. The implementation of MC were also capable of promoting a significant reduction in the failure rate. Thus, we conclude that the use of MC seems to have contributed to improving student performance and also the approval rating in the discipline of Anatomy, especially after the systematization of its use by the Teaching Project supported by the institution.
DOI: 10.6084/m9.figshare.6151883
title: Use of SnOx:F in the Recycling of Silicon Solar Cells

description: Amongst the many parts of a silicon cells photovoltaic module, silicon is the most important and expensive constituent. Thus, research on silicon recycling from damaged cells can lead to economic and environmental benefits. In this work, the broken silicon cells were tailored to function along with the fluorine-doped tin oxide as the transparent electric conductors. The broken silicon cells were analyzed by the current density versus voltage plots, together with the Mott-Schottky, X-rays diffraction and fluorescence analysis. Under light, the damaged cells sandwiched between the two transparent electric conductors presented photovoltaic effect. However, such effect was not obtained after the removal of the antireflection layer due to the destruction of the n-type layer as demonstrated by the Mott-Schottky analysis. The X-rays diffraction revealed samples rich on silicon atoms and the presence of aluminum atoms as impurity.
DOI: 10.6084/m9.figshare.6151883.v1
title: Use of SnOx:F in the Recycling of Silicon Solar Cells

description: Amongst the many parts of a silicon cells photovoltaic module, silicon is the most important and expensive constituent. Thus, research on silicon recycling from damaged cells can lead to economic and environmental benefits. In this work, the broken silicon cells were tailored to function along with the fluorine-doped tin oxide as the transparent electric conductors. The broken silicon cells were analyzed by the current density versus voltage plots, together with the Mott-Schottky, X-rays diffraction and fluorescence analysis. Under light, the damaged cells sandwiched between the two transparent electric conductors presented photovoltaic effect. However, such effect was not obtained after the removal of the antireflection layer due to the destruction of the n-type layer as demonstrated by the Mott-Schottky analysis. The X-rays diffraction revealed samples rich on silicon atoms and the presence of aluminum atoms as impurity.
DOI: 10.6084/m9.figshare.6151880
title: Performance of Chitosan/Glycerol Phosphate Hydrogel as a Support for Lipase Immobilization

description: A biocompatible and biodegradable hybrid chitosan/glycerol phosphate hydrogel (CS-GP) was prepared and evaluated as support for enzyme immobilization. In this work a lipase sn-1,3 specific from Rhizopus oryzae was physically immobilized in CS-GP by adsorption (PA) and in CS-GP modified chemically with glutaraldehyde (CS-GP-GA) by covalent attachment (CA). The matrices (pure and chemically modified) and immobilized lipases were characterized by scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and thermogravimetric (TG) analysis. Moreover, a comparative study between free and immobilized lipase was provided in terms of pH, temperature, kinetic parameters and thermal stability. The catalytic properties of biocatalysts were assayed in olive oil hydrolysis. The maximum activities were found at 60◦C/pH 8.5 and 50◦C/pH 7.5 for lipase immobilized by PA and CA, respectively. Both immobilization process turned biocatalysts highly active, since they were stable for 120 days at low (-10◦C) temperatures and around 2-fold more stable than free lipase at 60◦C (high temperature). Thus, results revealed the potential application of chitosan/glycerol phosphate hydrogel (CS-GP) as matrix for lipase immobilization. Nevertheless, better performance was achieved when the lipase was immobilized by covalent attachment.
DOI: 10.6084/m9.figshare.6151880.v1
title: Performance of Chitosan/Glycerol Phosphate Hydrogel as a Support for Lipase Immobilization

description: A biocompatible and biodegradable hybrid chitosan/glycerol phosphate hydrogel (CS-GP) was prepared and evaluated as support for enzyme immobilization. In this work a lipase sn-1,3 specific from Rhizopus oryzae was physically immobilized in CS-GP by adsorption (PA) and in CS-GP modified chemically with glutaraldehyde (CS-GP-GA) by covalent attachment (CA). The matrices (pure and chemically modified) and immobilized lipases were characterized by scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and thermogravimetric (TG) analysis. Moreover, a comparative study between free and immobilized lipase was provided in terms of pH, temperature, kinetic parameters and thermal stability. The catalytic properties of biocatalysts were assayed in olive oil hydrolysis. The maximum activities were found at 60◦C/pH 8.5 and 50◦C/pH 7.5 for lipase immobilized by PA and CA, respectively. Both immobilization process turned biocatalysts highly active, since they were stable for 120 days at low (-10◦C) temperatures and around 2-fold more stable than free lipase at 60◦C (high temperature). Thus, results revealed the potential application of chitosan/glycerol phosphate hydrogel (CS-GP) as matrix for lipase immobilization. Nevertheless, better performance was achieved when the lipase was immobilized by covalent attachment.
DOI: 10.6084/m9.figshare.6151877
title: Characterization of Vitrocrystalline Foams Produced from Discarded Glasses and Recycled Polystyrene Spheres

description: In this work, discarded soda-lime glasses (from glass bottles) and recycled polystyrene (PS) spheres (d50 &lt; 300 µm) were successfully converted into vitrocrystalline foams for thermal insulation applications. Physical and chemical properties of the selected and prepared raw materials (wastes) were characterized. Batches containing well mixed glass powder (d50 &lt; 5 µm), PS spheres (10 - 80 vol.%) and PVA (8 vol.% ) were obtained and uniaxially pressed at 20 MPa. The obtained powder compacts were dried in air for 24 h and then fired at different temperatures (850 to 900 °C, 10 °C/min) for 30 min. Vitrocrystalline foams with interconned cells sizes between 86 and 815 µm, homogeneously distributed in a crack free matrix, were characterized from the point of view of their typical physical, chemical, morphological and mechanical properties. The results showed that it is possible to obtain vitrocrystalline foams with porosities up to 89% and compressive strength varying from 4 to 25 MPa.
DOI: 10.6084/m9.figshare.6151877.v1
title: Characterization of Vitrocrystalline Foams Produced from Discarded Glasses and Recycled Polystyrene Spheres

description: In this work, discarded soda-lime glasses (from glass bottles) and recycled polystyrene (PS) spheres (d50 &lt; 300 µm) were successfully converted into vitrocrystalline foams for thermal insulation applications. Physical and chemical properties of the selected and prepared raw materials (wastes) were characterized. Batches containing well mixed glass powder (d50 &lt; 5 µm), PS spheres (10 - 80 vol.%) and PVA (8 vol.% ) were obtained and uniaxially pressed at 20 MPa. The obtained powder compacts were dried in air for 24 h and then fired at different temperatures (850 to 900 °C, 10 °C/min) for 30 min. Vitrocrystalline foams with interconned cells sizes between 86 and 815 µm, homogeneously distributed in a crack free matrix, were characterized from the point of view of their typical physical, chemical, morphological and mechanical properties. The results showed that it is possible to obtain vitrocrystalline foams with porosities up to 89% and compressive strength varying from 4 to 25 MPa.
DOI: 10.6084/m9.figshare.6151868
title: Financialization and the Stock-Flow Consistent Approach

description: Abstract Although most of the academic works on financialization are descriptive or empirical, in the last decade attempts have been made to represent its features in formal macroeconomic models. Given the deficiencies of previous analyses, some authors have used the Stock-Flow Consistent (SFC) approach to elaborate formal macroeconomic models of financialisation. This work analyzes the effort to incorporate financialisation into macroeconomic models using the Stock-Flow Consistent approach, in an attempt to evaluate the degree to which the referred approach is able to formally represent financialisation in the way it is conceived by descriptive and empirical literature and overcome the deficiencies present in the previous formal analyses.
DOI: 10.6084/m9.figshare.6151865
title: Flavonoids, phenolic content, and antioxidant activity of propolis from various areas of Guanajuato, Mexico

description: Abstract Propolis is a resin gathered by honey bees from trees and shrubs but it used in the beehive as building material or as an antibiotic paste. The aim of this study was to determine the content of flavonoids and phenols, as well as the antioxidant capacity of propolis from various regions of Guanajuato, Mexico. The content of flavonoids and phenols was determined by the aluminum nitrate method and the Folin-Ciocalteu method. The antioxidant capacity was determined using the free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH•) method and the ferric reduction of Fe3+ to Fe2+ (FRAP•) assay. The flavonoid content varied from 13 to 379 mg of quercetin equivalents (QE) per g of propolis and the phenolic content ranged from 68 to 500 mg of caffeic acid equivalents (CAE) per g of propolis. The trolox equivalent antioxidant capacity (TEAC) per g of propolis varied from 39.8 to 54.4 for the DPPH• method and from 50 to 2000 for the FRAP• assay. Propolis rich in flavonoids and phenols possesses a low antioxidant capacity. The results show that propolis from different areas of Guanajuato are rich in flavonoids and phenolics compounds while their antioxidant capacity is variable.
DOI: 10.6084/m9.figshare.6151865.v1
title: Flavonoids, phenolic content, and antioxidant activity of propolis from various areas of Guanajuato, Mexico

description: Abstract Propolis is a resin gathered by honey bees from trees and shrubs but it used in the beehive as building material or as an antibiotic paste. The aim of this study was to determine the content of flavonoids and phenols, as well as the antioxidant capacity of propolis from various regions of Guanajuato, Mexico. The content of flavonoids and phenols was determined by the aluminum nitrate method and the Folin-Ciocalteu method. The antioxidant capacity was determined using the free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH•) method and the ferric reduction of Fe3+ to Fe2+ (FRAP•) assay. The flavonoid content varied from 13 to 379 mg of quercetin equivalents (QE) per g of propolis and the phenolic content ranged from 68 to 500 mg of caffeic acid equivalents (CAE) per g of propolis. The trolox equivalent antioxidant capacity (TEAC) per g of propolis varied from 39.8 to 54.4 for the DPPH• method and from 50 to 2000 for the FRAP• assay. Propolis rich in flavonoids and phenols possesses a low antioxidant capacity. The results show that propolis from different areas of Guanajuato are rich in flavonoids and phenolics compounds while their antioxidant capacity is variable.
DOI: 10.6084/m9.figshare.6151862
title: Microencapsulation of grape seed oil by spray drying

description: Abstract In the search for alternative wall materials to replace gum Arabic (GA), a good but expensive encapsulating agent, this work aimed to evaluate the effectiveness of maltodextrin 10DE in combination with GA (GA/MD, 50:50 ratio) for the microencapsulation of grape seed oil by spray drying. The addition of maltodextrin to gum Arabic did not influence the mean particle diameter, powder bulk density, encapsulation efficiency or the total oil retained in the microspheres. Although the oil encapsulated with GA showed greater retention of phenolic compounds after spray drying, the sample encapsulated with GA/MD had greater ferric reduction antioxidant power and DPPH radical scavenging activity, and a lower peroxide index.
DOI: 10.6084/m9.figshare.6151862.v1
title: Microencapsulation of grape seed oil by spray drying

description: Abstract In the search for alternative wall materials to replace gum Arabic (GA), a good but expensive encapsulating agent, this work aimed to evaluate the effectiveness of maltodextrin 10DE in combination with GA (GA/MD, 50:50 ratio) for the microencapsulation of grape seed oil by spray drying. The addition of maltodextrin to gum Arabic did not influence the mean particle diameter, powder bulk density, encapsulation efficiency or the total oil retained in the microspheres. Although the oil encapsulated with GA showed greater retention of phenolic compounds after spray drying, the sample encapsulated with GA/MD had greater ferric reduction antioxidant power and DPPH radical scavenging activity, and a lower peroxide index.