cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.14321866.v1
title: Evaluation of the corrosion resistance of electroless Ni-P coatings on magnesium

description: ABSTRACT Magnesium and its alloys offer a wide range of applications due to their excellent properties, however, their high chemical reactivity depends on their possible application in environments that have high chloride contents, because the development of an efficient method of surface protection and Easy implementation on an industrial scale is necessary. In the present work, nickel-phosphorus (Ni-P) electrolytic coatings on magnesium substrates were obtained from a chromate-free method. Subsequently, these coatings were evaluated electrochemically by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in NaCl 3.5% wt solution. The results indicate that the coatings obtained manage to produce greater thermodynamic stability to the magnesium surfaces and reduce approximately the corrosion rate by a factor of 1000. Therefore, the methodology for obtaining the Nickel-phosphorus coatings that we propose in this work is susceptible to industrial scale.
DOI: 10.6084/m9.figshare.14321869
title: Hydration of ternary cement pastes with metakaolin and nanosilica at early ages

description: ABSTRACT Supplementary cementitious materials (SCM) have been used in cementitious systems, improving performance, sustainability and cost. Among these SCM’s, metakaolin (MK) and nanosilica (NS), have been topic of many studies with promising results, increasing strength and refining microstructure. However, the combined use of these materials in cement pastes, especially regarding the behavior at early ages, has been topic of few studies. Therefore, the objective of this paper was to evaluate ternary pastes with metakaolin and nanosilica at early ages (1, 3 and 7 days). Six pastes were produced, one of reference, two with cement replacement by NS and three with 15% replacement of clinker for complementary contents of NS and MK (0+15%, 1+14% and 2.5+12.5%). These contents enabled a comparison between the behavior of ternary and the respective binary pastes, evaluating the synergy between the materials. Compressive strength, thermogravimetric analysis (TGA) and semi adiabatic calorimetry, by the Langavant method, were performed. Results show the potential of combining these materials, with great improvement of the compressive strength at the early ages. Thermogravimetry and calorimetry results were used to characterize cement hydration in this type of mixture. It was marked by an acceleration and CH consumption by the pozzolanic reaction, both potentialized in the ternary mixtures. Furthermore, a synergistic effect between the materials was observed in the hydration, resulting in the highest compressive strength value at 7 days. However, differences observed in results of the ternary pastes indicate that this synergistic effect depends on the ration between metakaolin and nanosilica content in paste composition.
DOI: 10.6084/m9.figshare.14321869.v1
title: Hydration of ternary cement pastes with metakaolin and nanosilica at early ages

description: ABSTRACT Supplementary cementitious materials (SCM) have been used in cementitious systems, improving performance, sustainability and cost. Among these SCM’s, metakaolin (MK) and nanosilica (NS), have been topic of many studies with promising results, increasing strength and refining microstructure. However, the combined use of these materials in cement pastes, especially regarding the behavior at early ages, has been topic of few studies. Therefore, the objective of this paper was to evaluate ternary pastes with metakaolin and nanosilica at early ages (1, 3 and 7 days). Six pastes were produced, one of reference, two with cement replacement by NS and three with 15% replacement of clinker for complementary contents of NS and MK (0+15%, 1+14% and 2.5+12.5%). These contents enabled a comparison between the behavior of ternary and the respective binary pastes, evaluating the synergy between the materials. Compressive strength, thermogravimetric analysis (TGA) and semi adiabatic calorimetry, by the Langavant method, were performed. Results show the potential of combining these materials, with great improvement of the compressive strength at the early ages. Thermogravimetry and calorimetry results were used to characterize cement hydration in this type of mixture. It was marked by an acceleration and CH consumption by the pozzolanic reaction, both potentialized in the ternary mixtures. Furthermore, a synergistic effect between the materials was observed in the hydration, resulting in the highest compressive strength value at 7 days. However, differences observed in results of the ternary pastes indicate that this synergistic effect depends on the ration between metakaolin and nanosilica content in paste composition.
DOI: 10.6084/m9.figshare.14321874
title: Characterization of clay deposit in the central region of Piauí for use in the ceramic industry

description: ABSTRACT The clay ceramics industry comprises materials used in construction (bricks, tiles, and expanded clay, among others), is of great importance for Brazilian economic development, and the industry is seeking new sources of raw material, mainly clay. The present work aims to characterize a clay deposit located in the central region of the state of Piauí, to make feasible its use as ceramic raw material, seeking to boost the clay ceramics industry. The chemical composition, the crystalline phases, and the plasticity of the clay were analyzed. Specimens were prepared by uniaxial pressing, dried in an oven at 110 °C, and then heated to 900 °C, 1000 °C, and 1100 °C. Bending strength, apparent porosity, linear shrinkage, water absorption, and mineralogical, macrostructural, and microstructural analyses were determined. The results showed an improvement in the indices with the increase in the firing temperature and that the samples showed a reddish coloration due to the presence of iron, as well as quartz and kaolinite. Thus, the clay deposit has the potential to become raw material for the clay ceramics industry in the state of Piauí.
DOI: 10.6084/m9.figshare.14321874.v1
title: Characterization of clay deposit in the central region of Piauí for use in the ceramic industry

description: ABSTRACT The clay ceramics industry comprises materials used in construction (bricks, tiles, and expanded clay, among others), is of great importance for Brazilian economic development, and the industry is seeking new sources of raw material, mainly clay. The present work aims to characterize a clay deposit located in the central region of the state of Piauí, to make feasible its use as ceramic raw material, seeking to boost the clay ceramics industry. The chemical composition, the crystalline phases, and the plasticity of the clay were analyzed. Specimens were prepared by uniaxial pressing, dried in an oven at 110 °C, and then heated to 900 °C, 1000 °C, and 1100 °C. Bending strength, apparent porosity, linear shrinkage, water absorption, and mineralogical, macrostructural, and microstructural analyses were determined. The results showed an improvement in the indices with the increase in the firing temperature and that the samples showed a reddish coloration due to the presence of iron, as well as quartz and kaolinite. Thus, the clay deposit has the potential to become raw material for the clay ceramics industry in the state of Piauí.
DOI: 10.6084/m9.figshare.14321877
title: Characterization of biopolymeric films based on cassava starch, chitosan and carnauba wax

description: ABSTRACT Biopolymer films can advantageously substitute polymers of petrochemical origin in several areas, such as packaging of fruits and vegetables. As these products exhibit breathability and perspiration even after harvesting, barrier properties and water resistance of the packaging material are crucial. In this work, biopolymer films based on cassava starch (0-3%), chitosan (0-3%), carnauba wax (0; 0.2%) and glycerol (0,6%) were obtained and their properties of interest were determined. The wax incorporation reduced on average 20% of the water vapor transmission rate, WVTR, in relation to the films without wax. Among the films containing wax, 1c (3% starch) and 2c (2% starch; 1% chitosan) presented lower values of WVTR, 12.55 g / m²h and 12.42 g / m²h respectively, were then subjected to other characterizations that revealed that the partial replacement of starch by chitosan did not affect the film thickness, caused a decrease of 14% in its solubility and improved mechanical properties, which means increase in its potential for the intended application.
DOI: 10.6084/m9.figshare.14321877.v1
title: Characterization of biopolymeric films based on cassava starch, chitosan and carnauba wax

description: ABSTRACT Biopolymer films can advantageously substitute polymers of petrochemical origin in several areas, such as packaging of fruits and vegetables. As these products exhibit breathability and perspiration even after harvesting, barrier properties and water resistance of the packaging material are crucial. In this work, biopolymer films based on cassava starch (0-3%), chitosan (0-3%), carnauba wax (0; 0.2%) and glycerol (0,6%) were obtained and their properties of interest were determined. The wax incorporation reduced on average 20% of the water vapor transmission rate, WVTR, in relation to the films without wax. Among the films containing wax, 1c (3% starch) and 2c (2% starch; 1% chitosan) presented lower values of WVTR, 12.55 g / m²h and 12.42 g / m²h respectively, were then subjected to other characterizations that revealed that the partial replacement of starch by chitosan did not affect the film thickness, caused a decrease of 14% in its solubility and improved mechanical properties, which means increase in its potential for the intended application.
DOI: 10.6084/m9.figshare.14321878
title: Influence of particle size distribution and content of ceramic tile polishing residues on mechanical performance of cementitious matrices

description: ABSTRACT This study aims to evaluate the influence of particle size distribution and the content of the replacement of cement by ceramic tile polishing residue on the mechanical strength of cementitious matrices. Eight types of mortars were produced in a ratio of 1:3 by weight (cement: sand) and water/fine (cement + residue) ratio of 0.48 with levels of replacement of 0; 10; 30 and 50% of ceramic tile polishing residue. It was adopted waste with two different particle size distributions: in natura and ground by 30 minutes in a ball mill. Residues were characterized by specific mass; laser diffraction analysis; X-ray diffraction and Chapelle modified method. In the fresh state, mortars were evaluated by tests of consistency, mass density and air content and in the hardened state by compression strength at 7, 28 and 150 days. The grinding of ceramic tile polishing residue was beneficial because it promoted the development of pozzolanic activity and an increase of the compression strength. The results showed that the replacement of 30% cement by ground residue resulted in compressive strength of 34 MPa at 28 days and it can reach 38MPa at 150 days. The replacement of cement by ceramic tile polishing residue with a controlled size particle distribution can be favorable to the industry because it possible reduce costs and environmental impact both by reuse of the residue or as a contribution to CO2 mitigation.
DOI: 10.6084/m9.figshare.14321883
title: Co-Cr-Mo-W powder obtained by mechanical alloying

description: ABSTRACT New techniques for manufacturing of biomaterials using additive/substrate manufacturing such as melting laser sintering (SLM) or CAD/CAM milling use micrometric metal powders to build custom parts. CoCrMo alloys are commonly used as biomaterials due to biocompatibility, high corrosion resistance and good mechanical properties. In this work, Cr-Co-based powder was obtained by mechanical alloying of Cr-Co-Mo-W alloy, using different Ball/Powder-Ratios (BPR) and thermal treatments. The powders were deagglomerated and characterized by X-ray diffraction (XRD) and Scanning electron microscopy (SEM). Based on SEM micrographs, the particle size analysis was used to compare the particles spheroidizing degree, using Feret’s diameter. The XRD patterns shown Co(solid-solution) as crystalline phase. The results of particles size indicates a decrease of Feret’s diameter in BPR (Ball/Powder-Ratio) from 4:1 to 6:1 understanding that from this ratio there is no significant decrease of this relation but there is an average size increase with losses in morphological aspect. The comparison between atomized powders and powder developed in this work indicates that atomized products present relation close to one which indicates there is uniformity in the particles spherical shape. Comparing ground powders from 6:1 ratio (before and after thermal treatment) there is a considerable decrease of Feret’s diameter being it decreased from 1.75 to 1.4, an increase of about 46% in particles spheroidizing.
DOI: 10.6084/m9.figshare.14321883.v1
title: Co-Cr-Mo-W powder obtained by mechanical alloying

description: ABSTRACT New techniques for manufacturing of biomaterials using additive/substrate manufacturing such as melting laser sintering (SLM) or CAD/CAM milling use micrometric metal powders to build custom parts. CoCrMo alloys are commonly used as biomaterials due to biocompatibility, high corrosion resistance and good mechanical properties. In this work, Cr-Co-based powder was obtained by mechanical alloying of Cr-Co-Mo-W alloy, using different Ball/Powder-Ratios (BPR) and thermal treatments. The powders were deagglomerated and characterized by X-ray diffraction (XRD) and Scanning electron microscopy (SEM). Based on SEM micrographs, the particle size analysis was used to compare the particles spheroidizing degree, using Feret’s diameter. The XRD patterns shown Co(solid-solution) as crystalline phase. The results of particles size indicates a decrease of Feret’s diameter in BPR (Ball/Powder-Ratio) from 4:1 to 6:1 understanding that from this ratio there is no significant decrease of this relation but there is an average size increase with losses in morphological aspect. The comparison between atomized powders and powder developed in this work indicates that atomized products present relation close to one which indicates there is uniformity in the particles spherical shape. Comparing ground powders from 6:1 ratio (before and after thermal treatment) there is a considerable decrease of Feret’s diameter being it decreased from 1.75 to 1.4, an increase of about 46% in particles spheroidizing.
DOI: 10.6084/m9.figshare.14321886
title: Toxicity effects of magnesium oxide nanoparticles: a brief report

description: ABSTRACT In this work, magnesium oxide nanoparticles were synthesized by the sol-gel route and their ecotoxicity was tested in worms of the Eisenia andrei species. Magnesium oxide nanoparticles were characterized by XRD, surface area via BET, TEM and SEM-FEG/EDS. The lethality test with Eisenia andrei earthworm species followed the recommendations of ISO 11268-1 (ISO, 2012) in a completely randomized design with six replicates for each concentration tested (1.06, 2.12, 4.24, 8.48 and 16.96 μg of NPs-MgO/kg of soil), plus the control. The concentrations were mixed to the tropical natural soils, Entisol Typic Quartzipsamments and Oxisol, with no agricultural use history. The morphological and structural analyses of the nanoparticles indicated the formation of magnesium oxide with cubic structure, constituting agglomerates of nanostructures of the order of 20 to 50 nm. The results of toxicity were submitted to analysis of variance (ANOVA One-way), followed by the Dunnett test (p &lt;0.05). Based on standardized toxicological tests it was found that NPs-MgO, at the concentrations tested, did not affect the survival of Eisenia andrei species in the natural soils studied.
DOI: 10.6084/m9.figshare.14321886.v1
title: Toxicity effects of magnesium oxide nanoparticles: a brief report

description: ABSTRACT In this work, magnesium oxide nanoparticles were synthesized by the sol-gel route and their ecotoxicity was tested in worms of the Eisenia andrei species. Magnesium oxide nanoparticles were characterized by XRD, surface area via BET, TEM and SEM-FEG/EDS. The lethality test with Eisenia andrei earthworm species followed the recommendations of ISO 11268-1 (ISO, 2012) in a completely randomized design with six replicates for each concentration tested (1.06, 2.12, 4.24, 8.48 and 16.96 μg of NPs-MgO/kg of soil), plus the control. The concentrations were mixed to the tropical natural soils, Entisol Typic Quartzipsamments and Oxisol, with no agricultural use history. The morphological and structural analyses of the nanoparticles indicated the formation of magnesium oxide with cubic structure, constituting agglomerates of nanostructures of the order of 20 to 50 nm. The results of toxicity were submitted to analysis of variance (ANOVA One-way), followed by the Dunnett test (p &lt;0.05). Based on standardized toxicological tests it was found that NPs-MgO, at the concentrations tested, did not affect the survival of Eisenia andrei species in the natural soils studied.
DOI: 10.5281/zenodo.4639943
title: FA-TE_2021-03-23_E01_Mouse-full-blood-count-test

description: data for electronic lab book exp FA-TE_2021-03-23_E01_Mouse-full-blood-count-test
DOI: 10.5281/zenodo.4639942
title: FA-TE_2021-03-23_E01_Mouse-full-blood-count-test

description: data for electronic lab book exp FA-TE_2021-03-23_E01_Mouse-full-blood-count-test
DOI: 10.6084/m9.figshare.14321890
title: Adaptation and analysis of a didactic laminator for non-ferrous metals

description: ABSTRACT Lamination is a plastic deformation forming process widely used in the industry for the processing of semi-finished metal alloys, as it not only gives the desired commercial shape to the product, but also provides increased mechanical properties in a continuous and high productivity process. In this way, it is important that the engineering academic understand how the equipment used in the lamination works and what are the variables that influence this process. In this context, and thinking that skills obtained through experiments that relate theory to practice are fundamental for the formation of an engineer, the purpose of this work was to design and adapt a didactic laminator of the duo type, for nonferrous metals that, employee during the graduation, promote greater proximity of engineering students with this industrial process. The adaptation of this device was based on an existing manual jewelry mill, which was coupled to an electric motor that promoted the power needed for the process. The result of this work was the adaptation of a rolling mill that met the lamination expectations, being available for the elaboration of activities that propel the academic understanding on the subject. In relation to the metals that were rolled, several characteristics of the cold rolling process and its products described in the literature and in the mechanical transformation industry were observed during the execution of the tests of operation and of the tests, thus validating the adaptation of the equipment and the achievement of its main objective.
DOI: 10.25345/c5qz3t
title: MassIVE MSV000087106 - Selective inhibition reveals the regulatory function of DYRK2 in protein synthesis and calcium entry
title: The dual-specificity tyrosine phosphorylation-regulated kinase DYRK2 has emerged as a key regulator of cellular processes such as proteasome-mediated protein degradation. To gain further insights into its function, we took a chemical biology approach and developed C17, a potent small-molecule DYRK2 inhibitor, through multiple rounds of structure-based optimization guided by a number of co-crystallized structures. C17 displayed an effect on DYRK2 at a single-digit nanomolar IC50 and showed outstanding selectivity for the human kinome containing 467 other human kinases. Using C17 as a chemical probe, we further performed quantitative phosphoproteomic assays and identified several novel DYRK2 targets, including eukaryotic translation initiation factor 4E-binding protein 1 (4E-BP1) and stromal interaction molecule 1 (STIM1). DYRK2 phosphorylated 4E-BP1 at multiple sites, and the combined treatment of C17 with AKT and MEK inhibitors showed synergistic 4E-BP1 phosphorylation suppression. The phosphorylation of STIM1 by DYRK2 substantially increased the interaction of STIM1 with the ORAI1 channel, and C17 impeded the store-operated calcium entry process. Collectively, these studies further expand our understanding of DYRK2 and provide a valuable tool to further pinpoint its biological function.
DOI: 10.6084/m9.figshare.14321892
title: Performance analysis of column-to-column connections using steel shoe splices in precast concrete structures

description: ABSTRACT Precast concrete structures in Brazil are usually unbraced with continuous columns. Which are responsible for the lateral stability and vertical load transfer. With the growing use of precast concrete structures in multi-storey buildings arises a need for moment-resisting connections in the concrete columns, explained by the logistical difficulties of transport and assembly. Moment-resisting connections are a solution to counteract the logistical shortcomings. The main focus of this paper consists in analyzing the connection’s mechanical behavior under service loads. In order to achieve this goal two full scale models were built and tested (four point bending): one cast-in-situ column and one connected using steel shoes. The measured displacements were used to determine the equivalent stiffness, curvature, and deflection. From this research it’s possible to assert that the model with bolted connections (LB-PAR) displays similar behavior to the cast-in-situ model up until 80% of the load that causes the rebar to yield. The mechanical behavior of the connection is considered satisfactory for regular use, since the restrictions to the use are observed in the specific cases in which the structural behaviour is significantly influenced by second order effects.
DOI: 10.6084/m9.figshare.14321892.v1
title: Performance analysis of column-to-column connections using steel shoe splices in precast concrete structures

description: ABSTRACT Precast concrete structures in Brazil are usually unbraced with continuous columns. Which are responsible for the lateral stability and vertical load transfer. With the growing use of precast concrete structures in multi-storey buildings arises a need for moment-resisting connections in the concrete columns, explained by the logistical difficulties of transport and assembly. Moment-resisting connections are a solution to counteract the logistical shortcomings. The main focus of this paper consists in analyzing the connection’s mechanical behavior under service loads. In order to achieve this goal two full scale models were built and tested (four point bending): one cast-in-situ column and one connected using steel shoes. The measured displacements were used to determine the equivalent stiffness, curvature, and deflection. From this research it’s possible to assert that the model with bolted connections (LB-PAR) displays similar behavior to the cast-in-situ model up until 80% of the load that causes the rebar to yield. The mechanical behavior of the connection is considered satisfactory for regular use, since the restrictions to the use are observed in the specific cases in which the structural behaviour is significantly influenced by second order effects.