cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.14321787.v1
title: Table S1:Hardground, gap and thin black shale: spatial heterogeneity of arrested carbonate sedimentation during the Jenkyns Event (T-OAE) in a Tethyan pelagic basin (Gerecse Mts, Hungary)

description: Table providing full details of the geochemical and mineralogical data
DOI: 10.6084/m9.figshare.14321788
title: Polymerization depths of conventional and bulk fill composites photoactivated by different methods

description: ABSTRACT The aim of this study was to evaluate the depth of cure of conventional (Filtek Z350 and Esthet-X HD) and bulk fill resins composites (Filtek bulk fill flow and SDR) using different photoactivation methods. Samples were made using five disc-shaped matrices (1 mm high and 8 mm central diameter) with interposed polyester strips. The samples were photoactivated using different methods [continuous high-irradiance light (LCA), continuous low-irradiance light (LCB), and soft-start (SS)], maintaining 24 J/cm2 radiant exposure. After 24h, Knoop microhardness test was performed at 5 depths (surface, 1 mm, 2 mm, 3 mm and 4 mm). The Knoop microhardness were analyzed by ANOVA two-way and Tukey’s test (5%). Conventional resins presented the highest results up to 2 mm depth, except for Esthet-X photoactived by LCB, which showed significant lower Knoop hardness from 2 mm depth. Bulk fill resins photoactivated with LCA and SS had the highest results in 4 mm depth. The LCA and SS photoactivation methods produce suitable photoactivation in conventional composites up to 2 mm and bulk fill up to 4 mm depth and the bulk fill composites present higher polymerization depth than conventional composites.
DOI: 10.6084/m9.figshare.14321788.v1
title: Polymerization depths of conventional and bulk fill composites photoactivated by different methods

description: ABSTRACT The aim of this study was to evaluate the depth of cure of conventional (Filtek Z350 and Esthet-X HD) and bulk fill resins composites (Filtek bulk fill flow and SDR) using different photoactivation methods. Samples were made using five disc-shaped matrices (1 mm high and 8 mm central diameter) with interposed polyester strips. The samples were photoactivated using different methods [continuous high-irradiance light (LCA), continuous low-irradiance light (LCB), and soft-start (SS)], maintaining 24 J/cm2 radiant exposure. After 24h, Knoop microhardness test was performed at 5 depths (surface, 1 mm, 2 mm, 3 mm and 4 mm). The Knoop microhardness were analyzed by ANOVA two-way and Tukey’s test (5%). Conventional resins presented the highest results up to 2 mm depth, except for Esthet-X photoactived by LCB, which showed significant lower Knoop hardness from 2 mm depth. Bulk fill resins photoactivated with LCA and SS had the highest results in 4 mm depth. The LCA and SS photoactivation methods produce suitable photoactivation in conventional composites up to 2 mm and bulk fill up to 4 mm depth and the bulk fill composites present higher polymerization depth than conventional composites.
DOI: 10.6084/m9.figshare.14321791
title: Effect of infill pattern in Fused Filament Fabrication (FFF) 3D Printing on materials performance

description: ABSTRACT Fused Filament Fabrication (FFF) is an Additive Manufacturing process popularized in the last decade due to its easiness of use and lower costs. However, despite its increasing popularity, the process itself has several gaps in knowledge, hindering further uses on more advanced objects. Also, the freedom of design allows significant variances in the printed parts, many influencing production and mechanical properties. This work studies the influences of the infill patterns in the mechanical response of printed parts. Using poly (lactic acid) (PLA), a widely used polymer in FFF process, the mechanical responses of parts printed with different infill patterns were analyzed. Rectilinear, Honeycomb, Triangle and Grid patterns were tested on impact resistance and tensile strength. Additionally, samples masses were measured and compared to the mechanical response. Results shown significant differences in the on tested properties. Tensile strength varied from 2.4 to 1.1 MPa, and impact resistance from 3.8 to 1.5 kJ/m2 Also, measured mass was found to be significantly higher on the Honeycomb pattern. Considering mechanical response from both tensile and impact tests along with printed mass, Rectilinear pattern can be considered the most advantageous from the economic point of view.
DOI: 10.6084/m9.figshare.14321793
title: Preparation and characterization of absorbent materials based on glycerine and kaolin from caraí - Minas Gerais - Brasil

description: ABSTRACT The production of water-absorbing materials is a major challenge for several applications in the agricultural, industrial and energy sectors, among others. In the present work, materials were prepared from the reaction of glycerin, kaolin and succinic acid, with sulfuric acid as a catalyst. Three molar ratios were used for the kaolin mixture: succinic acid, 1: 0, 1: 1 and 0: 1. Materials were also prepared in a reaction with the aid of Dean-stark, where three samples were prepared. Starch films were produced to facilitate the application of the materials obtained. The FTIR confirmed the polymerization of succinic acid with glycerin, and its anchoring to kaolin. What can also be evidenced through the DRX. Absorption tests show that the material produced can be used as an absorbent material, absorbing about 50 g of water per g of sample.
DOI: 10.6084/m9.figshare.14321793.v1
title: Preparation and characterization of absorbent materials based on glycerine and kaolin from caraí - Minas Gerais - Brasil

description: ABSTRACT The production of water-absorbing materials is a major challenge for several applications in the agricultural, industrial and energy sectors, among others. In the present work, materials were prepared from the reaction of glycerin, kaolin and succinic acid, with sulfuric acid as a catalyst. Three molar ratios were used for the kaolin mixture: succinic acid, 1: 0, 1: 1 and 0: 1. Materials were also prepared in a reaction with the aid of Dean-stark, where three samples were prepared. Starch films were produced to facilitate the application of the materials obtained. The FTIR confirmed the polymerization of succinic acid with glycerin, and its anchoring to kaolin. What can also be evidenced through the DRX. Absorption tests show that the material produced can be used as an absorbent material, absorbing about 50 g of water per g of sample.
DOI: 10.6084/m9.figshare.14321797
title: Structure and properties of starch and flour of four Brazilian sweet potatoes (Ipomoea batatas) cultivars

description: ABSTRACT Starch is the most natural polymer used in the food and non-food industry. Sweet potato is among the world’s most important, versatile and underexploited food crops; its composition depends on the planting strategy, climatic conditions, cultivar, geographic region, soil quality, and other. The physical-chemical characteristic and functional properties depends also of the amylose, amylopectin ratio and the molecular components of amylose and amylopectin. In this study, the structural and physicochemical properties of starches from four sweet potato genotypes cultivated in Brazil were compared. Starch granules of roots of sweet potato all exhibited oval and irregular shapes with granule sizes ranging from 8 to 30 µm. Amylose contents of roots of sweet potato starches differed from 9.7 to 15.1%. Ratios of 1045/1022 and 1022/995 cm-1 of Fourier transform infrared spectra varied in the range of 0.8114–0.8558 and 0.9046–0.9347, respectively, which means that the genotypes present different structure ordering. Also, the digestibility, swelling power, and solubility showed some differences between the starches, probably due to the differences in amylose and amylopectin contents and granules sizes. The different genotypes showed similar thermal stability. Our study indicated the sweet potato genotypes are greatly influenced the amylose content, structure order, the degree of short-range order, granule size, digestibility, swelling power and solubility of sweet potato genotypes.
DOI: 10.6084/m9.figshare.14321797.v1
title: Structure and properties of starch and flour of four Brazilian sweet potatoes (Ipomoea batatas) cultivars

description: ABSTRACT Starch is the most natural polymer used in the food and non-food industry. Sweet potato is among the world’s most important, versatile and underexploited food crops; its composition depends on the planting strategy, climatic conditions, cultivar, geographic region, soil quality, and other. The physical-chemical characteristic and functional properties depends also of the amylose, amylopectin ratio and the molecular components of amylose and amylopectin. In this study, the structural and physicochemical properties of starches from four sweet potato genotypes cultivated in Brazil were compared. Starch granules of roots of sweet potato all exhibited oval and irregular shapes with granule sizes ranging from 8 to 30 µm. Amylose contents of roots of sweet potato starches differed from 9.7 to 15.1%. Ratios of 1045/1022 and 1022/995 cm-1 of Fourier transform infrared spectra varied in the range of 0.8114–0.8558 and 0.9046–0.9347, respectively, which means that the genotypes present different structure ordering. Also, the digestibility, swelling power, and solubility showed some differences between the starches, probably due to the differences in amylose and amylopectin contents and granules sizes. The different genotypes showed similar thermal stability. Our study indicated the sweet potato genotypes are greatly influenced the amylose content, structure order, the degree of short-range order, granule size, digestibility, swelling power and solubility of sweet potato genotypes.
DOI: 10.34703/gzx1-9v95/qckjew/4vwvrp
title: ABC-UTC-2016-C1-OU02_FinalReport_FINAL_2020-01-18_rev.pdf

description: Final
DOI: 10.34703/gzx1-9v95/qckjew/auad16
title: ABC-UTC-2016-C1-OU02_Guide_FINAL_2020-01-30_rev.pdf

description: Project Guide
DOI: 10.6084/m9.figshare.14321799
title: Structural characterization of sustainable geopolymers of steel slag LD and steel slag LF with KOH

description: ABSTRACT Production of composites based on derivative products of industrial wastes was presented in this study, which aggregate value to metallurgical, steelmaker wastes of the industries, and this is reversed in beneficial effects to society. Geopolymeric materials can be a solution to industrial residues generated for these sectors. The objective of study was the investigation between a solid/liquid relationship to production of specimens obtained from geopolymerization reaction, using steelmaking slags by process of Linz Donawitz (LD) and ladle furnace (LF), respectively. Samples of the residues were synthesized from an alkaline solution of 8M potassium hydroxide (KOH) in the 1.2, 1.4 and 1.6 g/v proportions (solid/liquid). Analyses of chemical composition, thermal stability, microstructure, amount of crystallinity phases and porosity were evaluated to XRF, FTIR, TGA, SEM-FEG and Archimedes’ principle obtained by reaction geopolymerization through the steelmaking slags (LF and LD), respectively. The results indicated that obtained geopolymers from steelmaking slags developed specimens with dimensional stability and high possibilities of applications, as engineering materials. The results indicate that the solid / liquid ratio is an important point in the geopolymerization process, since the 1.6 samples presented a more cohesive appearance and higher densification values than the 1.2 and 1.4 samples.
DOI: 10.6084/m9.figshare.14321799.v1
title: Structural characterization of sustainable geopolymers of steel slag LD and steel slag LF with KOH

description: ABSTRACT Production of composites based on derivative products of industrial wastes was presented in this study, which aggregate value to metallurgical, steelmaker wastes of the industries, and this is reversed in beneficial effects to society. Geopolymeric materials can be a solution to industrial residues generated for these sectors. The objective of study was the investigation between a solid/liquid relationship to production of specimens obtained from geopolymerization reaction, using steelmaking slags by process of Linz Donawitz (LD) and ladle furnace (LF), respectively. Samples of the residues were synthesized from an alkaline solution of 8M potassium hydroxide (KOH) in the 1.2, 1.4 and 1.6 g/v proportions (solid/liquid). Analyses of chemical composition, thermal stability, microstructure, amount of crystallinity phases and porosity were evaluated to XRF, FTIR, TGA, SEM-FEG and Archimedes’ principle obtained by reaction geopolymerization through the steelmaking slags (LF and LD), respectively. The results indicated that obtained geopolymers from steelmaking slags developed specimens with dimensional stability and high possibilities of applications, as engineering materials. The results indicate that the solid / liquid ratio is an important point in the geopolymerization process, since the 1.6 samples presented a more cohesive appearance and higher densification values than the 1.2 and 1.4 samples.
DOI: 10.34703/gzx1-9v95/qckjew/lvsj11
title: ABC-UTC-2016-C1-OU02-Data.zip

description: Summary of earthquake records as measured at seismic station GS.OK005 in 2016
DOI: 10.34703/gzx1-9v95/qckjew
title: Rapid Retrofitting Techniques For Induced Earthquakes – Phase I [ABC-UTC-2016-C1-OU02]

description: States such as Oklahoma, Texas, Kansas and Arkansas have historically experienced only one or two tectonic earthquakes annually, but these states are now experiencing earthquakes at an increased rate due to induced seismicity. Consequently, State Departments of Transportation (DOTs) are concerned about how their bridges that were originally designed for low seismic design loads will handle this increased seismic demand. While a bridge collapse is unlikely for an induced earthquake, cumulative effects of large number of small induced earthquakes compounded with an occasional moderate earthquake may lead to damages negatively impacting the safety of the traveling public and the flow of the transportation network. This research addresses the knowledge gap on the effects of low-level frequent earthquakes on the bridges and proposes a framework to assess the cumulative damage on bridges using rainflow counting based on ASTM standard practice for cycle counting in fatigue. In addition, a quantitative measure – Fatigue Damage Index (FDI) – is developed using Miner’s Rule to identify the accumulated damage in the bridge, from which the remaining service life can be estimated. The FDI can also be used to predict when accelerated repairs may be required and to evaluate accelerated retrofit solutions. Further, a “typical” Oklahoma is modeled in a finite element program (OpenSees), and the proposed framework is applied to capture the structural deterioration of the bridge. Final Presentation: https://youtu.be/WLphp8xnBoc
DOI: 10.6084/m9.figshare.14321802
title: Synthesis, Characterization and Catalytic Evaluation of Cobalt and Niobium Oxide Solids Modified with Alkaline Earth Metals

description: ABSTRACT Cobalt and niobium oxide solids modified with alkaline earth metals (Mg, Ca, and Sr) were synthesized and characterized to compare the second element effect on the catalyst structural and chemical properties. The materials were prepared by co-precipitation of cobalt nitrate and niobium oxalate solutions using ammonium hydroxide as precipitating agent. The samples were characterized by XRD, SEM, Ra-man, BET, TPR, ammonia TPD and cyclohexane dehydrogenation reaction (CHD). Results showed that Mg, Ca or Sr addition changed cobalt niobate crystalline structure, leading to alkaline earth metal nio-bates with lower crystallinity. It was observed that Mg, Ca or Sr increased the solids acidity and changed cobalt niobate reduction behavior so that the lowest amount of metallic cobalt was obtained when Mg was incorporated. Modifiers also decreased cobalt niobate dehydrogenation activity. This effect was higher with Mg or Sr addition.
DOI: 10.6084/m9.figshare.14321802.v1
title: Synthesis, Characterization and Catalytic Evaluation of Cobalt and Niobium Oxide Solids Modified with Alkaline Earth Metals

description: ABSTRACT Cobalt and niobium oxide solids modified with alkaline earth metals (Mg, Ca, and Sr) were synthesized and characterized to compare the second element effect on the catalyst structural and chemical properties. The materials were prepared by co-precipitation of cobalt nitrate and niobium oxalate solutions using ammonium hydroxide as precipitating agent. The samples were characterized by XRD, SEM, Ra-man, BET, TPR, ammonia TPD and cyclohexane dehydrogenation reaction (CHD). Results showed that Mg, Ca or Sr addition changed cobalt niobate crystalline structure, leading to alkaline earth metal nio-bates with lower crystallinity. It was observed that Mg, Ca or Sr increased the solids acidity and changed cobalt niobate reduction behavior so that the lowest amount of metallic cobalt was obtained when Mg was incorporated. Modifiers also decreased cobalt niobate dehydrogenation activity. This effect was higher with Mg or Sr addition.
DOI: 10.6084/m9.figshare.14321803.v1
title: Characterization and evaluation of thermoresponsive Ecovio®/PNIPAAm electrospun fibers

description: ABSTRACT In this work were obtained electrospun fibers from Ecovio® and poly (N-isopropylacrylamide) high molar mass (Ecovio®/PNIPAAm AMM) and low molar mass (Ecovio®/PNIPAAm BMM) blends. Ecovio®/PNIPAAm AMM blend fibers were obtained from solutions with a concentration of 10% and in the mass ratios of 100/0, 85/15, 70/30, 50/50 and 0/100. Ecovio®/PNIPAAm BMM fibers were obtained from 20% Ecovio® solutions with 1%, 2%, 3% or 10% addition of PNIPAAM BMM. The electrospun fibers were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy using attenuated reflectance enhancement (FTIR-ATR) and fiber surface wettability measurements. The addition of PNIPAAm AMM to the solutions of Ecovio®/PNIPAAm blends favored the electrospinning of the solutions, since the fibers obtained showed spherical morphology and absence of beads, mainly from the 30% mass ratio of PNIPAAm AMM. In addition, the presence of PNIPAAm AMM made Ecovio®/PNIPAAm fibers thermosensitive. This result was observed from water drop contact angle measurements as a function of temperature, which showed that the wettability of these fibers increased at temperatures below 32 ºC and at temperatures above 32 ºC decreased. This was due to the hydrophilic-hydrophobic transition characteristic of PNIPAAm in the 32-35 °C range. On the other hand, the same behavior was not observed for the Ecovio®/PNIPAAm BMM fibers, which had an improvement in wettability with the addition of PNIPAAm BMM, but did not exhibit the thermosensitivity behavior, probably due to the smaller size of the PNIPAAm BMM chains, which did not favor the hydrophilic-hydrophobic transition. Thus, it is likely that only the electrospun Ecovio®/PNIPAAm AMM fibers could have potential application in the area of cell growth/detachment.
DOI: 10.6084/m9.figshare.14321803
title: Characterization and evaluation of thermoresponsive Ecovio®/PNIPAAm electrospun fibers

description: ABSTRACT In this work were obtained electrospun fibers from Ecovio® and poly (N-isopropylacrylamide) high molar mass (Ecovio®/PNIPAAm AMM) and low molar mass (Ecovio®/PNIPAAm BMM) blends. Ecovio®/PNIPAAm AMM blend fibers were obtained from solutions with a concentration of 10% and in the mass ratios of 100/0, 85/15, 70/30, 50/50 and 0/100. Ecovio®/PNIPAAm BMM fibers were obtained from 20% Ecovio® solutions with 1%, 2%, 3% or 10% addition of PNIPAAM BMM. The electrospun fibers were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy using attenuated reflectance enhancement (FTIR-ATR) and fiber surface wettability measurements. The addition of PNIPAAm AMM to the solutions of Ecovio®/PNIPAAm blends favored the electrospinning of the solutions, since the fibers obtained showed spherical morphology and absence of beads, mainly from the 30% mass ratio of PNIPAAm AMM. In addition, the presence of PNIPAAm AMM made Ecovio®/PNIPAAm fibers thermosensitive. This result was observed from water drop contact angle measurements as a function of temperature, which showed that the wettability of these fibers increased at temperatures below 32 ºC and at temperatures above 32 ºC decreased. This was due to the hydrophilic-hydrophobic transition characteristic of PNIPAAm in the 32-35 °C range. On the other hand, the same behavior was not observed for the Ecovio®/PNIPAAm BMM fibers, which had an improvement in wettability with the addition of PNIPAAm BMM, but did not exhibit the thermosensitivity behavior, probably due to the smaller size of the PNIPAAm BMM chains, which did not favor the hydrophilic-hydrophobic transition. Thus, it is likely that only the electrospun Ecovio®/PNIPAAm AMM fibers could have potential application in the area of cell growth/detachment.
DOI: 10.6084/m9.figshare.14321805.v1
title: Effect of adding endocarp residue tucumã (Astrocaryum Aculeatum) in High Impact Polystyrene (HIPS)

description: ABSTRACT This work investigated the effect of adding residue from the tucumã (Astrocaryum Aculeatum) endocarp in high impact polystyrene. Specimens were obtained through plastic injection processing, to make the specimens, 2% and 4% by weight of waste (CPS2 and CPS4) were used. Thermal (TG and DSC), mechanical (impact test and tensile strength tests) and a study with infrared spectrometry (FTIR) were performed. Therefore, the mechanical study indicated a lower impact and traction resistance of CPS2 and CPS4 compared to pure material (HIPS). The thermal study indicated that thermal stability is improved with the incorporation of the residue. Through infrared spectrometry (FTIR), it was possible to verify the loss of monosubstitution bonds. In general, it was possible to observe a good adhesion between the particles, the compatibilizing effect of the residual lignin was noted, the residue-polymer interactions caused changes in the thermal, mechanical and spectroscopic properties in the specimens.
DOI: 10.6084/m9.figshare.14321805
title: Effect of adding endocarp residue tucumã (Astrocaryum Aculeatum) in High Impact Polystyrene (HIPS)

description: ABSTRACT This work investigated the effect of adding residue from the tucumã (Astrocaryum Aculeatum) endocarp in high impact polystyrene. Specimens were obtained through plastic injection processing, to make the specimens, 2% and 4% by weight of waste (CPS2 and CPS4) were used. Thermal (TG and DSC), mechanical (impact test and tensile strength tests) and a study with infrared spectrometry (FTIR) were performed. Therefore, the mechanical study indicated a lower impact and traction resistance of CPS2 and CPS4 compared to pure material (HIPS). The thermal study indicated that thermal stability is improved with the incorporation of the residue. Through infrared spectrometry (FTIR), it was possible to verify the loss of monosubstitution bonds. In general, it was possible to observe a good adhesion between the particles, the compatibilizing effect of the residual lignin was noted, the residue-polymer interactions caused changes in the thermal, mechanical and spectroscopic properties in the specimens.