cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.9871574
title: Urea-based polymethacrylamide purification

description: ABSTRACT A purification procedure of polymethacrylamide (PMAm) based on the urea feature of being a powerful Hbond breaker is proposed here. Polymethacrylamide was synthesized in water and the final product presents itself as an insoluble gel what is an obstacle to purification. This physical gel, kept together by numerous interchain H-bonds between amide groups in the polymer, is dismantle by a urea solution (4 mol.L-1) making the polymer soluble. Methanol is then used to precipitate the polymer, keeping urea, water and methacrylamide in the methanolic phase. FTIR, TGA, GPC and HPLC were used to characterize the final product and to prove the efficiency and convenience of this method. The procedure proposed here has presented a good recovery of the polymer and can be considered more convenient, less time-consuming and efficient than others such as dialysis.
DOI: 10.6084/m9.figshare.9871556
title: Physical therapy in patients with Alzheimer’s disease: a systematic review of randomized controlled clinical trials

description: ABSTRACT The objective of this study is to evaluate the effects of physical therapy on the cognitive and functional capacity of patients with Alzheimer’s Disease (AD). This is a systematic review of randomized or quasi-randomized clinical trials, using the descriptors: AD, dementia and physical therapy. Two studies were included with a total of 207 participants. In study 1, no statistically significant difference was found on the mini-mental state examination (MMSE) (MD 0.0, 95%CI −5.76 to 5.76), neuropsychiatric inventory (MD −4.50, 95%CI −21.24 to 12.24) and Pfeffer instrumental activities questionnaire (MD 0.0 95%CI −6.48 to 6.48). In study 2, there was no statistically significant difference on the MMSE (MD −1.60, 95% CI −3.57 to 0.37), clock-drawing test (MD −0.20, 95%CI −0.61 to 0.21) and Alzheimer’s Disease Assessment Scale - cognitive subscale (MD 1.0, 95%CI −2.21 to 4.21) after 12 months. There was no consistent evidence on the effectiveness of physiotherapeutic intervention in improving cognitive function and functional capacity of patients with AD. More studies should be conducted for better evidence.
DOI: 10.6084/m9.figshare.9871574.v1
title: Urea-based polymethacrylamide purification

description: ABSTRACT A purification procedure of polymethacrylamide (PMAm) based on the urea feature of being a powerful Hbond breaker is proposed here. Polymethacrylamide was synthesized in water and the final product presents itself as an insoluble gel what is an obstacle to purification. This physical gel, kept together by numerous interchain H-bonds between amide groups in the polymer, is dismantle by a urea solution (4 mol.L-1) making the polymer soluble. Methanol is then used to precipitate the polymer, keeping urea, water and methacrylamide in the methanolic phase. FTIR, TGA, GPC and HPLC were used to characterize the final product and to prove the efficiency and convenience of this method. The procedure proposed here has presented a good recovery of the polymer and can be considered more convenient, less time-consuming and efficient than others such as dialysis.
DOI: 10.6084/m9.figshare.9871541
title: Um Modelo Matemático para Estimativas do Consumo de Energia em Redes de Sensores Visuais sem Fio

description: ABSTRACT Wireless sensor networks have an important role in the current scenario of new communication technologies, focused on Internet of Things and Smart Cities applications. In those networks, energy issues are central, since many wireless sensor networks are developed to operate with battery-operated sensors. In such way, the proper planning of wireless sensor networks is required for good performance and there are some techniques to assess the performance of those networks without requiring deployment of real sensors. This article proposes a new mathematical model to assess energy consumption in camera-enabled sensors, allowing relevant measurements before deployment of physical networks. Besides this innovate mathematical model, a new tool was developed, referred as EnergyWVSN, aimed at the support of practical usage of the proposed model.
DOI: 10.6084/m9.figshare.9871556.v1
title: Physical therapy in patients with Alzheimer’s disease: a systematic review of randomized controlled clinical trials

description: ABSTRACT The objective of this study is to evaluate the effects of physical therapy on the cognitive and functional capacity of patients with Alzheimer’s Disease (AD). This is a systematic review of randomized or quasi-randomized clinical trials, using the descriptors: AD, dementia and physical therapy. Two studies were included with a total of 207 participants. In study 1, no statistically significant difference was found on the mini-mental state examination (MMSE) (MD 0.0, 95%CI −5.76 to 5.76), neuropsychiatric inventory (MD −4.50, 95%CI −21.24 to 12.24) and Pfeffer instrumental activities questionnaire (MD 0.0 95%CI −6.48 to 6.48). In study 2, there was no statistically significant difference on the MMSE (MD −1.60, 95% CI −3.57 to 0.37), clock-drawing test (MD −0.20, 95%CI −0.61 to 0.21) and Alzheimer’s Disease Assessment Scale - cognitive subscale (MD 1.0, 95%CI −2.21 to 4.21) after 12 months. There was no consistent evidence on the effectiveness of physiotherapeutic intervention in improving cognitive function and functional capacity of patients with AD. More studies should be conducted for better evidence.
DOI: 10.6084/m9.figshare.9871520
title: Effect of filler material on sliding wear resistance of a structural steel welded by GMAW

description: ABSTRACT The aim of the present work was to evaluate the effect of the filler material in the welding and its resulting microstructures on the wear resistance of welded joints of a structural weathering steel ASTM A242 used in wagons for mining. The samples were welded using the GMAW (Gas Metal Arc Welding) process using two filler materials which have different mechanical strength, AWS ER70S-6 and AWS ER80S-G. The wear resistance of the samples was evaluated using a linearly reciprocating sliding microwear test, dry and in a solution containing 0.05M NaCl, in three regions of the welded joint: base metal (BM), weld metal (WM) and coarse grained heat affected zone (CGHAZ).After welding, it was observed an increase in the mean hardness values of the MS and ZAC in comparison to the initial hardness of base metal with the use of both filler metals, and the hardness values in each of these regions were similar. The results of the microwear tests showed that BM presented the lowest wear resistance, possibly due to its microstructure, which facilitated wear by plastic deformation. The CGHAZ showed the highest wear resistance. Comparing the tests carried out under the dry and in solution conditions, a reduction in the coefficient of friction was observed when the solution was added to the system, and the volume loss of the tracks was more pronounced. It was observed that the use of the lower mechanical strength filler material produced welded joints with wear resistance comparable to the joints obtained with the higher strength filler material.
DOI: 10.6084/m9.figshare.9871541.v1
title: Um Modelo Matemático para Estimativas do Consumo de Energia em Redes de Sensores Visuais sem Fio

description: ABSTRACT Wireless sensor networks have an important role in the current scenario of new communication technologies, focused on Internet of Things and Smart Cities applications. In those networks, energy issues are central, since many wireless sensor networks are developed to operate with battery-operated sensors. In such way, the proper planning of wireless sensor networks is required for good performance and there are some techniques to assess the performance of those networks without requiring deployment of real sensors. This article proposes a new mathematical model to assess energy consumption in camera-enabled sensors, allowing relevant measurements before deployment of physical networks. Besides this innovate mathematical model, a new tool was developed, referred as EnergyWVSN, aimed at the support of practical usage of the proposed model.
DOI: 10.6084/m9.figshare.9871550
title: Nematofauna of red piranha Pygocentrus nattereri (Kner, 1958) (Characiformes: Serrasalmidae) from Amazonia, Brazil

description: Abstract Between March and October 2008, 355 specimens of Pygocentrus nattereri were collected from the lowland lakes of Central Amazonia, Brazil, to study their nematode fauna. A total of 1.116 specimens of Nematoda were collected, belonging to six species. Procamallanus (Spirocamallanus) inopinatus was the species with the highest parasite indices. Larvae of Anisakis sp. have zoonotic potential and were found parasitizing the intestine and liver of Pygocentrus nattereri. Some of these nematode species were new records for the host P. nattereri. The diversity of nematodes that use P. nattereri as a host indicates the important role of this fish species in the maintenance of these six nematode species in the lowland lakes of Central Amazonia.
DOI: 10.6084/m9.figshare.9871517
title: The genus Lepechinia Willd. (Lamiaceae - Salviinae) in Brazil

description: ABSTRACT Lepechinia is a New World genus of Lamiaceae with ca. 45 species. There is ongoing controversy regarding the recognition and delimitation of Lepechinia that occur in Brazil. After fieldwork and herbaria consultation we recognize two species of Lepechinia in Brazil: Lepechinia speciosa, distributed within the Mantiqueira region, and Lepechinia annae, endemic to Serra do Caparaó. A taxonomic revision of the genus Lepechinia in Brazil is provided including descriptions, lectotypifications, a distribution map, a photographic plate, an identification key, a conservation assessment and comments on both the taxonomy and ecology of the two species.
DOI: 10.6084/m9.figshare.9871520.v1
title: Effect of filler material on sliding wear resistance of a structural steel welded by GMAW

description: ABSTRACT The aim of the present work was to evaluate the effect of the filler material in the welding and its resulting microstructures on the wear resistance of welded joints of a structural weathering steel ASTM A242 used in wagons for mining. The samples were welded using the GMAW (Gas Metal Arc Welding) process using two filler materials which have different mechanical strength, AWS ER70S-6 and AWS ER80S-G. The wear resistance of the samples was evaluated using a linearly reciprocating sliding microwear test, dry and in a solution containing 0.05M NaCl, in three regions of the welded joint: base metal (BM), weld metal (WM) and coarse grained heat affected zone (CGHAZ).After welding, it was observed an increase in the mean hardness values of the MS and ZAC in comparison to the initial hardness of base metal with the use of both filler metals, and the hardness values in each of these regions were similar. The results of the microwear tests showed that BM presented the lowest wear resistance, possibly due to its microstructure, which facilitated wear by plastic deformation. The CGHAZ showed the highest wear resistance. Comparing the tests carried out under the dry and in solution conditions, a reduction in the coefficient of friction was observed when the solution was added to the system, and the volume loss of the tracks was more pronounced. It was observed that the use of the lower mechanical strength filler material produced welded joints with wear resistance comparable to the joints obtained with the higher strength filler material.
DOI: 10.6084/m9.figshare.9871511
title: Analyses of the generation of electric energy by using a TEG-type generator during continuous casting of steel

description: ABSTRACT Steel manufacturing is a process that requires large investments in fuels, iron ore, coal, among others. As such, global concerns related to environment preservation increases. As a consequence, alternative technologies may emerge as adequate management platforms of the available resources. For steel industry the conservation of energy has a prime importance, making heat recovery a hot topic. This research work describes the use of a set of Thermoelectric Generator (TEG) in order to recover residual energy during continuous casting operations. The TEG modules are constituted by manganese and calcium oxides, which are able to convert heat from the 1045 carbon steel plates in the end of continuous casting process into electrical energy. Each square module measures 64.5 mm of side and 8.5mm of thickness, being able to generate 12.3W if hot side temperature is at 800ºC and cold side at 50ºC. In the present contribution, estimations of quantity of recovered energy are shown. Thermal simulations using the software Deform as well as fitting methods have been implemented and incorporated to each other so that the effects of temperature, time and plate thickness could be examined. Considering a plate of 1045 steel with 400 mm of thickness and temperature of 1050ºC, continuous casted at 0.3 m/min, it was estimated a recovered energy equivalent to the consumption of electrical energy of 23 average Brazilian residences was estimated.
DOI: 10.6084/m9.figshare.9871517.v1
title: The genus Lepechinia Willd. (Lamiaceae - Salviinae) in Brazil

description: ABSTRACT Lepechinia is a New World genus of Lamiaceae with ca. 45 species. There is ongoing controversy regarding the recognition and delimitation of Lepechinia that occur in Brazil. After fieldwork and herbaria consultation we recognize two species of Lepechinia in Brazil: Lepechinia speciosa, distributed within the Mantiqueira region, and Lepechinia annae, endemic to Serra do Caparaó. A taxonomic revision of the genus Lepechinia in Brazil is provided including descriptions, lectotypifications, a distribution map, a photographic plate, an identification key, a conservation assessment and comments on both the taxonomy and ecology of the two species.
DOI: 10.6084/m9.figshare.9871550.v1
title: Nematofauna of red piranha Pygocentrus nattereri (Kner, 1958) (Characiformes: Serrasalmidae) from Amazonia, Brazil

description: Abstract Between March and October 2008, 355 specimens of Pygocentrus nattereri were collected from the lowland lakes of Central Amazonia, Brazil, to study their nematode fauna. A total of 1.116 specimens of Nematoda were collected, belonging to six species. Procamallanus (Spirocamallanus) inopinatus was the species with the highest parasite indices. Larvae of Anisakis sp. have zoonotic potential and were found parasitizing the intestine and liver of Pygocentrus nattereri. Some of these nematode species were new records for the host P. nattereri. The diversity of nematodes that use P. nattereri as a host indicates the important role of this fish species in the maintenance of these six nematode species in the lowland lakes of Central Amazonia.
DOI: 10.6084/m9.figshare.9871505
title: Effect of Sigma Phase Precipitated at 850 °C on Corrosion Behaviour of UNS S82441 Duplex Stainless Steel

description: ABSTRACT Duplex stainless steels (DSS) are alloys with binary microstructure consisting of ferrite (δ) and austenite (γ), combining high mechanical properties and corrosion resistance by pitting and stress corrosion, due to the two phases austenite/ferrite. However, the formation of secondary and intermetallic phases, during solidification processes, heat treatment or welding in duplex steels tend to cause the degradation of its main properties. The present study aim to investigate the corrosion behaviour of UNS S82441 aged at 850°C for 30, 300 and 3000 minutes, due to the formation of sigma phase. Corrosion resistance evaluation was performed by means of stress corrosion testing, potenciodinamic polarization and mass loss. The microstructural characterization and morphology confirmed the presence of sigma phase in the UNS S82441 duplex stainless steel, and that the amount of this phase increases with the time of heat treatment of aging. The aging time influences negatively the corrosion resistance of this steel, with a gradual drop of up to 50% on passivation regime for the condition of aging at 850°C for 3000 minutes.
DOI: 10.6084/m9.figshare.9871514
title: Study of the efficiency of Orbignya oleifera as a green corrosion inhibitor for low carbon steel compared to commercial inhibitor in 1M HCl solution

description: ABSTRACT The aim of this work is to compare the efficiency of babassu coconut oil (Orbignya oleifera) used as a green corrosion inhibitor and a commercial inhibitor tested on ABNT 1020 steel in hydrochloric acid medium. The search evaluation was accomplished with electromechanical techniques of linear polarizations and Tafel Extrapolation Method altogether with electrochemical impedance spectroscopy. The concentrations of the inhibitors were 3, 4 and 5 g/L in a solution of IM hydrochloric acid (HCI). The results of electrochemical impedance spectroscopy shows that Orbignya oleifera acts as an adsorption inhibitor and its inhibition efficiency value (56.45%) is higher when compared to the level of efficiency of the commercial inhibitor (36.08%) in the concentration of 3 g/L once that presented higher charge transfer resistance (47.3Ω) when compared to the HPAA (32.23Ω). The results of Linear Polarization Resistance shows Orbignya oleifera oil increased the inhibition efficiency in ABNT 1020 steel in 1M HCl solution at 3 and 4g/L concentrations. The level maximum inhibitory efficiency of Orbignya oleifera in this test was 48%. That percentage must be associated to chemical composition of that oil which contains lauric acid in a concentration of 47% - that probably contributed to a high efficiency of inhibition layer.
DOI: 10.6084/m9.figshare.9871502
title: Lime Addition Effect on Corrosion of Reinforced Mortar

description: ABSTRACT This study aims to investigate the effect of lime addition in cement mortar on corrosion resistance of carbon and galvanized steel reinforcements. Mixed mortars were studied containing three contents of lime (6.7, 13.3, and 26.3 wt.%). The water retention, incorporated air, and compression strength of reinforced mortars were determined. Immersion tests were performed using the reinforced mortars consisting of 12 cycles of immersion in a solution of 3.5% (wt./v) sodium chloride and drying in a stove at 60oC. Electrochemical impedance spectroscopy was used to monitoring reinforcement corrosion after cyclic tests. These measurements were repeated after 36 months of the cyclic immersion testing. After the cyclic immersion tests in a saline solution, the polarization resistance of carbon and galvanized steel reinforcement increased as the lime content in mortar increased, demonstrating the protective effect of lime. After 36 months, the polarization resistance of steels in mixed mortars with the highest lime content was the lowest. For the carbon and galvanized steel in cement and mixed mortars, the polarization resistance increased after 36 months of the cyclic test.
DOI: 10.6084/m9.figshare.9871505.v1
title: Effect of Sigma Phase Precipitated at 850 °C on Corrosion Behaviour of UNS S82441 Duplex Stainless Steel

description: ABSTRACT Duplex stainless steels (DSS) are alloys with binary microstructure consisting of ferrite (δ) and austenite (γ), combining high mechanical properties and corrosion resistance by pitting and stress corrosion, due to the two phases austenite/ferrite. However, the formation of secondary and intermetallic phases, during solidification processes, heat treatment or welding in duplex steels tend to cause the degradation of its main properties. The present study aim to investigate the corrosion behaviour of UNS S82441 aged at 850°C for 30, 300 and 3000 minutes, due to the formation of sigma phase. Corrosion resistance evaluation was performed by means of stress corrosion testing, potenciodinamic polarization and mass loss. The microstructural characterization and morphology confirmed the presence of sigma phase in the UNS S82441 duplex stainless steel, and that the amount of this phase increases with the time of heat treatment of aging. The aging time influences negatively the corrosion resistance of this steel, with a gradual drop of up to 50% on passivation regime for the condition of aging at 850°C for 3000 minutes.
DOI: 10.6084/m9.figshare.9871511.v1
title: Analyses of the generation of electric energy by using a TEG-type generator during continuous casting of steel

description: ABSTRACT Steel manufacturing is a process that requires large investments in fuels, iron ore, coal, among others. As such, global concerns related to environment preservation increases. As a consequence, alternative technologies may emerge as adequate management platforms of the available resources. For steel industry the conservation of energy has a prime importance, making heat recovery a hot topic. This research work describes the use of a set of Thermoelectric Generator (TEG) in order to recover residual energy during continuous casting operations. The TEG modules are constituted by manganese and calcium oxides, which are able to convert heat from the 1045 carbon steel plates in the end of continuous casting process into electrical energy. Each square module measures 64.5 mm of side and 8.5mm of thickness, being able to generate 12.3W if hot side temperature is at 800ºC and cold side at 50ºC. In the present contribution, estimations of quantity of recovered energy are shown. Thermal simulations using the software Deform as well as fitting methods have been implemented and incorporated to each other so that the effects of temperature, time and plate thickness could be examined. Considering a plate of 1045 steel with 400 mm of thickness and temperature of 1050ºC, continuous casted at 0.3 m/min, it was estimated a recovered energy equivalent to the consumption of electrical energy of 23 average Brazilian residences was estimated.
DOI: 10.6084/m9.figshare.9871514.v1
title: Study of the efficiency of Orbignya oleifera as a green corrosion inhibitor for low carbon steel compared to commercial inhibitor in 1M HCl solution

description: ABSTRACT The aim of this work is to compare the efficiency of babassu coconut oil (Orbignya oleifera) used as a green corrosion inhibitor and a commercial inhibitor tested on ABNT 1020 steel in hydrochloric acid medium. The search evaluation was accomplished with electromechanical techniques of linear polarizations and Tafel Extrapolation Method altogether with electrochemical impedance spectroscopy. The concentrations of the inhibitors were 3, 4 and 5 g/L in a solution of IM hydrochloric acid (HCI). The results of electrochemical impedance spectroscopy shows that Orbignya oleifera acts as an adsorption inhibitor and its inhibition efficiency value (56.45%) is higher when compared to the level of efficiency of the commercial inhibitor (36.08%) in the concentration of 3 g/L once that presented higher charge transfer resistance (47.3Ω) when compared to the HPAA (32.23Ω). The results of Linear Polarization Resistance shows Orbignya oleifera oil increased the inhibition efficiency in ABNT 1020 steel in 1M HCl solution at 3 and 4g/L concentrations. The level maximum inhibitory efficiency of Orbignya oleifera in this test was 48%. That percentage must be associated to chemical composition of that oil which contains lauric acid in a concentration of 47% - that probably contributed to a high efficiency of inhibition layer.