cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.14321644
title: The use of forest biomass in the manufacture of briquettes

description: ABSTRACT The importance of using alternative sources of energy, which are renewable and cause less damage to the environment, such as lower atmospheric pressure and carbon cycle stability, highlights a forest biomass. In this context, the production of briquettes, produced from forest residues found in the various production phases of pulp mills, was evaluated and chemically analyzed, as well as their physical and mechanical properties. Ten treatments were performed from four sampled residue classes, their analysis was performed by a completely randomized design, with 10 repetitions per treatment. For the statistical analysis, Tukey's test of comparison of means and analysis of main components was performed to explain the structure of variance. Treatments 4 and 10 showed higher calorific power due to its higher lignin percentage, as well as obtained the best energy density results. Regarding the density and mechanical strength, the values found were adequate and consistent with the literature, and the last variable did not differ statistically among the treatments. The principal components analysis was adequate, with the contents of extractives, moisture, lignin, and energy density the most important variables in the analysis, with the highest coefficients of the main component 1, which represents 70.9% of the total variance explained. Treatment 4, containing only Pinus Taeda bark, stood out for its best characteristics for energy.
DOI: 10.6084/m9.figshare.14321644.v1
title: The use of forest biomass in the manufacture of briquettes

description: ABSTRACT The importance of using alternative sources of energy, which are renewable and cause less damage to the environment, such as lower atmospheric pressure and carbon cycle stability, highlights a forest biomass. In this context, the production of briquettes, produced from forest residues found in the various production phases of pulp mills, was evaluated and chemically analyzed, as well as their physical and mechanical properties. Ten treatments were performed from four sampled residue classes, their analysis was performed by a completely randomized design, with 10 repetitions per treatment. For the statistical analysis, Tukey's test of comparison of means and analysis of main components was performed to explain the structure of variance. Treatments 4 and 10 showed higher calorific power due to its higher lignin percentage, as well as obtained the best energy density results. Regarding the density and mechanical strength, the values found were adequate and consistent with the literature, and the last variable did not differ statistically among the treatments. The principal components analysis was adequate, with the contents of extractives, moisture, lignin, and energy density the most important variables in the analysis, with the highest coefficients of the main component 1, which represents 70.9% of the total variance explained. Treatment 4, containing only Pinus Taeda bark, stood out for its best characteristics for energy.
DOI: 10.34703/gzx1-9v95/xamu4u/cl0br1
title: ABC-UTC_Course_Module_2020-02-30.pdf

description: Report Modules
DOI: 10.34703/gzx1-9v95/xamu4u
title: Development of ABC Course Module – The Risk Due to Induced Earthquakes and Accelerated Solutions [ABC-UTC-2016-C2-OU02]

description: This continuing education course provides the bridge engineering community with the opportunity to learn how to estimate the cumulative seismic demand on bridges, both accelerated and conventional, due to a large number of small-to-moderate earthquakes and to educate engineers on the potential use of accelerated bridge construction (ABC) repair/retrofit approaches. The web-based course comprises six modules and provides training on the ABC-UTC Guide for Assessing the Effects of Frequent, Low-Level Seismic Events. Also, a brief survey of available ABC repair techniques appropriate for cumulatively damaged bridges is provided. Final Presentation: https://mymedia.ou.edu/playlist/details/1_mrp460tg
DOI: 10.6084/m9.figshare.14321647
title: Improvement of mechanical properties and corrosion resistance of 316L and 304 stainless steel by low temperature plasma cementation

description: ABSTRACT Low temperature plasma carburizing treatment of austenitic stainless steels is a carbon surface diffusion process for a surface hardness and corrosion and wear resistance. The process is carried out by introducing a mixture of carbon-containing gases and through the use of low temperatures the resulting cemented layer usually contains a single phase of supersaturated austenite with carbon – S-phase. For the present investigation, austenitic stainless steels AISI 316L and 304 were plasma cemented for 8 hours in the gas mixture containing 7.5% CH4 in H2, with a pressure of 500 Pa, at temperatures of 375 ºC and 450 ºC. The phases formed were determined by X-ray diffraction. The corrosion resistance was evaluated through immersion tests over time and cyclic voltammetry. The results indicate that there was no formation of compounds (carbides) in the cemented layer for both steels at any of the temperatures and there was a corrosion resistance improvement.
DOI: 10.6084/m9.figshare.14321647.v1
title: Improvement of mechanical properties and corrosion resistance of 316L and 304 stainless steel by low temperature plasma cementation

description: ABSTRACT Low temperature plasma carburizing treatment of austenitic stainless steels is a carbon surface diffusion process for a surface hardness and corrosion and wear resistance. The process is carried out by introducing a mixture of carbon-containing gases and through the use of low temperatures the resulting cemented layer usually contains a single phase of supersaturated austenite with carbon – S-phase. For the present investigation, austenitic stainless steels AISI 316L and 304 were plasma cemented for 8 hours in the gas mixture containing 7.5% CH4 in H2, with a pressure of 500 Pa, at temperatures of 375 ºC and 450 ºC. The phases formed were determined by X-ray diffraction. The corrosion resistance was evaluated through immersion tests over time and cyclic voltammetry. The results indicate that there was no formation of compounds (carbides) in the cemented layer for both steels at any of the temperatures and there was a corrosion resistance improvement.
DOI: 10.6084/m9.figshare.14321649.v1
title: Determination of the elasticity module in steels and aluminum through the natural frequency compared to the tension test

description: ABSTRACT Many materials, when in service, are subjected to forces or loads. In these situations it is necessary to know the material properties, among them the elasticity modulus, to design parts and devices, so that any resulting deformation is predictable and not enough to occur plastic deformations, accelerated fatigue or even fracture. In this paper a dynamic method was used to define the elasticity modulus of an aluminum alloy and two types of steel measuring the natural frequency of vibration without the need to destroy the specimen, as in tensile tests for example. The experimental procedure consisted of subjecting the material to controlled impacts to obtain the natural frequencies through an accelerometer. With the frequency results, by mathematical means proposed by ASTM E 1876, the material’s elasticity modulus can be defined. This procedure can identify the material’s elasticity modulus in a non-destructive, fast and reliable manner. With the intention of obtaining parameters that can generate a level of reliability in the tests, the results of this experiment were compared with the results obtained in the tensile test, where the difference of Domex 700 steel between the methods was 3.22%, SAE 1522 steel difference was 1.68% and the 1200H14 aluminum alloy difference was 6.27%, showing that the method is valid and the results were similar.
DOI: 10.6084/m9.figshare.14321649
title: Determination of the elasticity module in steels and aluminum through the natural frequency compared to the tension test

description: ABSTRACT Many materials, when in service, are subjected to forces or loads. In these situations it is necessary to know the material properties, among them the elasticity modulus, to design parts and devices, so that any resulting deformation is predictable and not enough to occur plastic deformations, accelerated fatigue or even fracture. In this paper a dynamic method was used to define the elasticity modulus of an aluminum alloy and two types of steel measuring the natural frequency of vibration without the need to destroy the specimen, as in tensile tests for example. The experimental procedure consisted of subjecting the material to controlled impacts to obtain the natural frequencies through an accelerometer. With the frequency results, by mathematical means proposed by ASTM E 1876, the material’s elasticity modulus can be defined. This procedure can identify the material’s elasticity modulus in a non-destructive, fast and reliable manner. With the intention of obtaining parameters that can generate a level of reliability in the tests, the results of this experiment were compared with the results obtained in the tensile test, where the difference of Domex 700 steel between the methods was 3.22%, SAE 1522 steel difference was 1.68% and the 1200H14 aluminum alloy difference was 6.27%, showing that the method is valid and the results were similar.
DOI: 10.5519/qd.85tf7ggk
title: Query on the Natural History Museum Data Portal (data.nhm.ac.uk) (29 records)
DOI: 10.5281/zenodo.4639842
title: Supplemental Material to "Robust Query Processing for Linked Data Fragments"

description: Supplemental Material to the Experimental Result in "Robust Query Processing for Linked Data Fragments". The Materials include the raw experimental results as well as the queries used in the experiments.
DOI: 10.6084/m9.figshare.14321652
title: Influence of H2S on the formation and reconstruction of passive layer of Super 13Cr steel in simulated deep water oil exploration media

description: ABSTRACT In the oil and gas industry, supermartensitic stainless steel (Super 13Cr) has been used in the manufacture of steel tubes for use in oil drilling. Super 13Cr is a more financially viable option than super duplex steel in the oil and gas market. The objective of this work is to evaluate the influence of pH variations and the presence of H2S dissolved in the medium in the corrosion resistance of super martensitic steel in saline solution saturated with H2S, thus simulating the operating conditions in the industry's pre-salt of oil. The electrochemical tests used were anodic potentiodynamic and cyclic polarization. For the subsequent characterization of the surface, the techniques used were optical microscopy and scanning electron microscopy (SEM). The effect of the presence of H2S in the medium increased the susceptibility to corrosion of the steel due to a greater destabilization of the naturally formed passive layer, reduction of the pitting potential and of the repassivation potential. Super 13Cr steel was also less resistant when the pH was varied to lower values, causing a reduction in pitting potential. With the tests carried out and the analysis of the micrographs, the super 13Cr steel was less resistant to corrosion in more acidic media and in the presence of hydrogen sulfide in the medium. The main consequences of this increase in severity were the presence of larger and deeper pits, which can develop into cracks if there are mechanical stresses, less noble pitting potentials and great resistance to repassivation.
DOI: 10.6084/m9.figshare.14321650.v1
title: Comparative development between systems of formation and incorporation of defects in aluminum castings

description: ABSTRACT The present work is a comparative study between two filling systems, one called conventional and another called constrict. The objective of this work is to evaluate the performance of the systems in the formation and incorporation of defects (oxides and air bublles) in aluminum cast part (plate), in no bake process. In this study, we used numerical simulation software (MAGMASOFT), X-ray test, tensile test, optical microscopy and scanning electron microscopy (SEM). In comparison, the samples of conventional system showed greater tendency to the formation and incorporation of defects and lower mechanical resistance, showing better performance of constrict system.
DOI: 10.6084/m9.figshare.14321652.v1
title: Influence of H2S on the formation and reconstruction of passive layer of Super 13Cr steel in simulated deep water oil exploration media

description: ABSTRACT In the oil and gas industry, supermartensitic stainless steel (Super 13Cr) has been used in the manufacture of steel tubes for use in oil drilling. Super 13Cr is a more financially viable option than super duplex steel in the oil and gas market. The objective of this work is to evaluate the influence of pH variations and the presence of H2S dissolved in the medium in the corrosion resistance of super martensitic steel in saline solution saturated with H2S, thus simulating the operating conditions in the industry's pre-salt of oil. The electrochemical tests used were anodic potentiodynamic and cyclic polarization. For the subsequent characterization of the surface, the techniques used were optical microscopy and scanning electron microscopy (SEM). The effect of the presence of H2S in the medium increased the susceptibility to corrosion of the steel due to a greater destabilization of the naturally formed passive layer, reduction of the pitting potential and of the repassivation potential. Super 13Cr steel was also less resistant when the pH was varied to lower values, causing a reduction in pitting potential. With the tests carried out and the analysis of the micrographs, the super 13Cr steel was less resistant to corrosion in more acidic media and in the presence of hydrogen sulfide in the medium. The main consequences of this increase in severity were the presence of larger and deeper pits, which can develop into cracks if there are mechanical stresses, less noble pitting potentials and great resistance to repassivation.
DOI: 10.6084/m9.figshare.14321650
title: Comparative development between systems of formation and incorporation of defects in aluminum castings

description: ABSTRACT The present work is a comparative study between two filling systems, one called conventional and another called constrict. The objective of this work is to evaluate the performance of the systems in the formation and incorporation of defects (oxides and air bublles) in aluminum cast part (plate), in no bake process. In this study, we used numerical simulation software (MAGMASOFT), X-ray test, tensile test, optical microscopy and scanning electron microscopy (SEM). In comparison, the samples of conventional system showed greater tendency to the formation and incorporation of defects and lower mechanical resistance, showing better performance of constrict system.
DOI: 10.34703/gzx1-9v95/ailbpu/gul9hj
title: RC-BRIDGE-GIRDER-REPAIR-GUIDE-1.pdf

description: Guide
DOI: 10.34703/gzx1-9v95/ailbpu/zijnu0
title: synthesis-girder-repair-final-revised-report.pdf

description: Final
DOI: 10.34703/gzx1-9v95/ailbpu
title: Synthesis of Available Methods for Repair of Reinforced Concrete and Prestressed Concrete Girders [ABC-UTC-2016-C2-UNR02]

description: The bridge structures nationwide and in the United States are aging, and in need of repair or in some cases replacement. Depending on the state of the damage to the bridge and other project specific requirements, the decision makers will choose either repair or replacement. Given the higher cost of replacement of the bridge or even the damaged girders in the bridge compared to most of the available repair techniques, the repair option has gained popularity among the decision makers. This is because using a proper repair approach, as a long-term or even a short-term solution, can lead to benefits that could not be achieved otherwise. The main benefits are considerable savings in both time and cost. Additionally, an appropriate repair approach can also help to avoid adverse environmental impacts, interruptions to service, overburdening of nearby infrastructure, and local opposition to construction. The objective of this report is to provide a synthesis of the available methods on the repair of reinforced concrete bridge girders used in practice and/or in research studies. Commonly utilized repair materials are briefly described. Different applications of the repair methods (i.e. repair for shear, flexure, or fire) are then described in detail, while providing information on the causes of damage for each case in addition to typical solutions and case studies. Step by step procedure of the typical solutions mentioned earlier is then described in detail. Finally, recommendations on the proper material and appropriate repair procedures for specific applications are provided by the authors. This is intended to enable researchers, engineers, and decision makers to compare the available repair methods more conveniently to find the optimal repair approach for specific projects based on the economic, environmental requirements as well as structural and construction conditions. Final Presentation: https://abc-utc.fiu.edu/wp-content/uploads/sites/52/2020/10/girder-reapir-5-minute-video.mp4
DOI: 10.6084/m9.figshare.14321656
title: Processing of API 5L X70 steel by warm rolling and plasma nitriding

description: ABSTRACT The increasing need to transport large quantities of oil and gas in aggressive environments has led to a demand for high strength and low alloy steels (HSLA) of API (American Petroleum Institute) grade. No doubt, the main failure method of these steels is hydrogen-induced cracking (HIC), so there is a need to look for metallurgical alternatives to reduce the susceptibility of these materials to this phenomenon and some of these solutions is the warm rolling and plasma nitriding. The present study aims on evaluating the influence of the warm rolling on the microstructure and formation of the nitrided layer in API 5L X70 steel. For this, samples of the steel in question were submitted to controlled warm rolling with 49.4% reduction with initial temperature 863 °C and final temperature 689 °C, posteriorly, conventional plasma nitriding and using cathodic cage in parameters were performed: 450 °C, with a gas flow of 75% H2 - 25% N2 and 25% H2 - 75% N2, pressure 2.5 Torr. For the characterization, optical microscopy, Vickers microhardness test and X-ray diffraction were performed. The obtained results show that the microstructure presented a lower banding, in relation of the material as received, through a higher distribution of perlite caused by the warm rolling. The nitriding formed a thin layer of compounds of superficial hardness of up to 670.0 HV (HV 0.05) formed by nitrides of type (Fe3N) and γ '(Fe4N). These characteristics are important in the fight against hydrogen-induced cracking, and suggest that the combination of these two techniques may be promising.
DOI: 10.6084/m9.figshare.14321656.v1
title: Processing of API 5L X70 steel by warm rolling and plasma nitriding

description: ABSTRACT The increasing need to transport large quantities of oil and gas in aggressive environments has led to a demand for high strength and low alloy steels (HSLA) of API (American Petroleum Institute) grade. No doubt, the main failure method of these steels is hydrogen-induced cracking (HIC), so there is a need to look for metallurgical alternatives to reduce the susceptibility of these materials to this phenomenon and some of these solutions is the warm rolling and plasma nitriding. The present study aims on evaluating the influence of the warm rolling on the microstructure and formation of the nitrided layer in API 5L X70 steel. For this, samples of the steel in question were submitted to controlled warm rolling with 49.4% reduction with initial temperature 863 °C and final temperature 689 °C, posteriorly, conventional plasma nitriding and using cathodic cage in parameters were performed: 450 °C, with a gas flow of 75% H2 - 25% N2 and 25% H2 - 75% N2, pressure 2.5 Torr. For the characterization, optical microscopy, Vickers microhardness test and X-ray diffraction were performed. The obtained results show that the microstructure presented a lower banding, in relation of the material as received, through a higher distribution of perlite caused by the warm rolling. The nitriding formed a thin layer of compounds of superficial hardness of up to 670.0 HV (HV 0.05) formed by nitrides of type (Fe3N) and γ '(Fe4N). These characteristics are important in the fight against hydrogen-induced cracking, and suggest that the combination of these two techniques may be promising.
DOI: 10.6084/m9.figshare.14321658
title: Preparation and characterization of a titanium alloy with the addition of tantalum and zirconium for biomedical applications

description: ABSTRACT Titanium alloys are widely used in the biomedical field due to its excellent corrosion resistance in bodily fluids, high mechanical strength/density ratio, low elastic modulus and good biocompatibility. The most promising alloys to be used in the biomedical field have solid solution elements that decrease the phase transformation temperature of titanium. Such elements are called beta-stabilizers and are obtained as a result of their introduction in the alloy, the decrease of the elastic modulus and an excellent corrosion resistance. Tantalum and zirconium elements, when added to the titanium, improve the corrosion resistance and diminish the elastic modulus, because tantalum is considered a β-stabilizer element and the zirconium acts as a stabilizing element of this phase, in presence of another β-stabilizer element. In this paper, Ti-25Ta-5Zr alloy was prepared by arc-melting, aiming biomedical applications. The chemical, structural, microstructural and mechanical characterizations were performed by means of chemical composition measurements, gas analysis, energy dispersive spectrometry (EDS), X-ray diffraction, optical and scanning electron microscopies, Vickers microhardness and elastic modulus. The obtained results showed a good stoichiometry and homogeneity of the samples. Structural and microstructural analyses corroborated each other and indicated that the alloy has the coexistence of two phases, α" (with orthorhombic crystalline structure) and β (with body-centered cubic structure). The microhardness increased with the addition of such elements and the elastic modulus has values below the commercially used alloys, satisfactory for application as orthopedic implant.