cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.6857165.v1
title: Serum concentration of progesterone, pH of the vagina and body morphometryof pregnant deer (Cervus unicolor)in captivity

description: ABSTRACT The aim was to study pregnant cervus in captivity, to obtain body morphometric data, serum progesterone concentrations, and pH of the vagina. Females of cervus (Cervus unicolor), (n=8) between 2 and 3 years old were used in November during breeding season. After sedation, in one collection, the following was measured: body weight 54.50 ± 18.70kg, body length 1.21 ± 0.16m, height at withers 0.75 ± 0.08m, thoracic perimeter 0.84 ± 0.12m, and body mass index 97.32 ± 10.50kg / m2. After sedation, blood samples were collected to measure progesterone concentration by radioimmunoassay and the use of an indicator tape to obtain the pH of the vagina was performed eight times at four day intervals in the eight females, in a total of 64 samples for each exam. Data were analyzed, and significance was at 5%. There were no differences (P&gt; 0.05) between measurements for serum progesterone concentrations and pH of the vagina. The correlations between body weight, progesterone, pH, and body mass index were not significant (P&gt; 0.05). There was no significant oscillation of progesterone concentration and pH of the vagina in the pregnancy period studied.
DOI: 10.6084/m9.figshare.6857159
title: Biomechanical test to determination the diameter of the polymethylmethacrylate bar in external skeletal fixator type Ia in swine humerusi

description: ABSTRACT Bone fractures can be corrected from external skeletal fixators (ESF) in a fairly common internal stabilization method, in which connector bars polymethylmethacrylate (PMMA) is used. PMMA is used without criterion of diameter, and it can break if it is too thin or too heavy. It can be uncomfortable when bulky. The aim of this study was to test, through biomechanical axial compression and bending which is the ideal connector bar diameter PMMA, correlated to bone diameter for use in type Ia ESF. Twenty-four humerus were used to make measurements of length, diameter, circumference, and biomechanical testing. After the bars confected with 1.5 times the average diameter of the bone (group I), the same diameter (group II) and 0.5 times the diameter of the bone (group III). With the obtained results, using GII and GIII results, it was observed that the connector bars in group II were more resistant than the bones in the compression test. In the bending test, the bones resisted flexion strength when compared to group III and the group II was 4.3 times more resistant than group III in the same mechanical test. The results allow a direction for making bars considering bone diameter as a reference.
DOI: 10.6084/m9.figshare.6857159.v1
title: Biomechanical test to determination the diameter of the polymethylmethacrylate bar in external skeletal fixator type Ia in swine humerusi

description: ABSTRACT Bone fractures can be corrected from external skeletal fixators (ESF) in a fairly common internal stabilization method, in which connector bars polymethylmethacrylate (PMMA) is used. PMMA is used without criterion of diameter, and it can break if it is too thin or too heavy. It can be uncomfortable when bulky. The aim of this study was to test, through biomechanical axial compression and bending which is the ideal connector bar diameter PMMA, correlated to bone diameter for use in type Ia ESF. Twenty-four humerus were used to make measurements of length, diameter, circumference, and biomechanical testing. After the bars confected with 1.5 times the average diameter of the bone (group I), the same diameter (group II) and 0.5 times the diameter of the bone (group III). With the obtained results, using GII and GIII results, it was observed that the connector bars in group II were more resistant than the bones in the compression test. In the bending test, the bones resisted flexion strength when compared to group III and the group II was 4.3 times more resistant than group III in the same mechanical test. The results allow a direction for making bars considering bone diameter as a reference.
DOI: 10.6084/m9.figshare.6857162.v1
title: Investigation of Salmonella spp. in exotic and native Psittaciformes kept in captivity in the central region of Rio Grande do Sul

description: ABSTRACT Infectious diseases are known to cause decline in wildlife population and some of them may represent a threat to public health. This study aimed to investigate the occurrence of Salmonella spp. in exotic and native Psittaciformes kept in captivity in the central region of Rio Grande do Sul, Brazil, and to comparing the results obtained through the conventional bacteriological method and the polymerase chain reaction (PCR), using fecal matter collected from the environment, avoiding the containment stress. From August to September 2016, samples of fresh feces were collected from 90 cages in two breeding grounds, representing 180 birds. According to both analysis techniques the samples were negative for Salmonella spp., however, bacteria from the Enterobacteriaceae family: Escherichia coli, Cedecea sp. and Citrobacter freundii were detected. Continuous monitoring of breeding grounds is important since the pathogen investigated can be found in carrier birds and manifest itself in stressful situations presenting risks such as zoonosis and reduced bird health.
DOI: 10.6084/m9.figshare.6857153
title: Microstructural, thermochemistry and mechanical evaluation of self-reducing pellets using electric arc furnace (EAF) dust containing zinc for Waelz process

description: ABSTRACT The increment of recycling of steel using electric arc furnace and the tendency to coat of steel products with zinc, in order to prevent corrosion, has increased the proportion of galvanized scrap used worldwide in the recent years. Approximately 10 to 20 Kg/t of cast steel is generated in casting arcs. These collected dusts electric arc furnace (EAF dust) contains iron, zinc, lead, and cadmium. Mainly in the form of oxides and their wastes are considered hazardous typically in countries such as Brazil, U.S., Japan and Germany. It is estimated that from the total of 7.5 million metric tons of EAF dust generated worldwide only 45% is recycled. With Waelz process, the EAF dust can be treated to recover zinc by means of reduction-volatilization-oxidation reactions occurring within the rotary kiln. In this work the thermodynamics of the Waelz process is studied to optimize the recovery of volatiles especially zinc. Kinetic parameters were evaluated trough series of ten experiments, comprise the major process factors such as type of reductants (charcoal and petroleum coke), time (20 – 120 minutes) and temperature (450 - 1150°C). The mechanical behavior of the pellets was evaluated by compressive cold strength and drop tests. Characterization was performed using scanning electron microscopy, microanalysis EDS, X-ray diffraction, X-ray fluorescence, granulometric analysis by laser diffraction, as well as measurements of moisture, bulk density and percentage of volatiles, fixed carbon and ash. The small pellets (10mm) with charcoal used as a reductant, presented a higher compression and higher recovery of volatiles than those with petroleum coke.
DOI: 10.6084/m9.figshare.6857156
title: A study of the metallic silver dissolution with the MEA-NH3-Cu system

description: ABSTRACT Leaching of silver from minerals has been studied for decades. Recently, research has been focused on the substitution of cyanide (because of its high toxicity) from hydrometallurgical operations. In this sense, the development of alternative-green leaching solutions for the recovery of metallic silver from minerals and urban mines is necessary. In this research, a thermodynamic-kinetic study of the alternative system “monoethanolamine (MEA)-ammonium sulfate-cupric sulfate” was performed for the dissolution of metallic silver, varying the pH and the cupric ion concentration at room temperature. Furthermore, this research aims to evaluate the silver dissolution behavior at a pH lower than 10.2, elucidating the rate determining step of the silver dissolution process at these conditions of pH and cupric ion concentration. Thermodynamic results confirm that the MEA and NH3 can complex silver generating the species: Ag(MEA)2+, AgMEA-, Ag(NH3)2+, AgNH3+ respectively. It was evaluated the effect of varying the pH (8.8, 9.9 and 9) and the cupric sulfate concentration (0.1, 0.15 and, 0.2 M at pH 9) on the kinetics of silver dissolution. The results revealed, the possibility to leach a 39% of silver using a leaching solution containing: 0.15 M cupric sulfate, 0.05 M MEA and 0.4 M ammonium sulfate at pH 9. The kinetic analysis showed that the silver dissolution is controlled by the diffusion of fluid species through a porous layer composed of copper oxides, which was ratified by SEM and EDS analysis. Finally the present paper, open the possibility to optimize the molar ratio MEA:NH3 to maximize the silver dissolution kinetics.
DOI: 10.6084/m9.figshare.6857153.v1
title: Microstructural, thermochemistry and mechanical evaluation of self-reducing pellets using electric arc furnace (EAF) dust containing zinc for Waelz process

description: ABSTRACT The increment of recycling of steel using electric arc furnace and the tendency to coat of steel products with zinc, in order to prevent corrosion, has increased the proportion of galvanized scrap used worldwide in the recent years. Approximately 10 to 20 Kg/t of cast steel is generated in casting arcs. These collected dusts electric arc furnace (EAF dust) contains iron, zinc, lead, and cadmium. Mainly in the form of oxides and their wastes are considered hazardous typically in countries such as Brazil, U.S., Japan and Germany. It is estimated that from the total of 7.5 million metric tons of EAF dust generated worldwide only 45% is recycled. With Waelz process, the EAF dust can be treated to recover zinc by means of reduction-volatilization-oxidation reactions occurring within the rotary kiln. In this work the thermodynamics of the Waelz process is studied to optimize the recovery of volatiles especially zinc. Kinetic parameters were evaluated trough series of ten experiments, comprise the major process factors such as type of reductants (charcoal and petroleum coke), time (20 – 120 minutes) and temperature (450 - 1150°C). The mechanical behavior of the pellets was evaluated by compressive cold strength and drop tests. Characterization was performed using scanning electron microscopy, microanalysis EDS, X-ray diffraction, X-ray fluorescence, granulometric analysis by laser diffraction, as well as measurements of moisture, bulk density and percentage of volatiles, fixed carbon and ash. The small pellets (10mm) with charcoal used as a reductant, presented a higher compression and higher recovery of volatiles than those with petroleum coke.
DOI: 10.6084/m9.figshare.6857147
title: Ultra lightweight Mg foam from recycled shavings

description: ABSTRACT Hundreds of people worldwide die or are severely maimed in collisions during traffic accidents, due to the energy transmitted to the passengers on impact. A dissipation of said energy is necessary to minimize it's effects, which can be achieved through absorbers. In recent years, metallic foams have started to be considered as energy absorbers. Metallic foams are relatively unknown structural materials, but with huge potential for applications where low weight but high rigidity are of primary interest. The use of ultralight magnesium (Mg) or magnesium alloy foams has two main advantages: less weight (more vehicle efficiency and less pollution) and impact energy absorption (less harm to passengers on board the vehicle). The machining of gearboxes made out of AZ91D magnesium alloy, generates large amounts of oilcontaminated metallic shavings. In this work, powder metallurgy is used as a recycling method of the AZ91 alloy. There were studied the conditions needed for obtaining metallic foam from recycled shavings of AZ91 and spacer (ammonium bicarbonate). The final product was characterized physically by determination of the foam's density. Also, compression tests were done to obtain values of absorbed energy, and specific absorbed energy, which characterize a metallic foam. Different metallography methods were used to characterize the structure of the sintered material. Different porosities were tested (50 and 70%). The foam's absorbed energy by unit mass [J/g] of the 50 % of porosity foam was over double compared to that of the magnesium sintered without spacer.
DOI: 10.6084/m9.figshare.6857150
title: Design, simulation and analysis of extrusion process for thermoplastic rigid PVC profile to optimize the design of the die and the parameters

description: ABSTRACT The objective of the present work was to verify and optimize the die design to manufacture a thermoplastic profile in rigid PVC using the simulation of the flow in the mentioned matrix through the use of Computational Fluid Dynamics (CFD) and through tests in extrusion, using an experimental calibrator, the required geometry and dimensions were obtained. The material used was a rigid PVC compound which is difficult to process because of its intrinsic weakness, since it degrades to 140ºC. By means of a special capillary rheometer the rheological data k and n of the Power Law model were determined, which was used as input variables in the software along with the flow channel geometry in the head. The geometry is drawn using computeraided design software in three dimensions (CAD-3D). The calibrator was designed and drawn in CAD-3D software and then built, mounted on the extruder. Extrusion was performed with the process parameters: flow rate (screw speed) and temperature of the material used in the simulation software. The results of the extrusion were compared: geometry and final dimensions of the profile, mass flow, pressure and temperature in the head with those obtained by the simulation, being the same satisfactory. From the simulation, the optimum distance at which the deformations of the cast profile at the exit of the die determined was minimal and allowed to be calibrated to the required profile dimensions. In addition, the velocity distributions and shear deformations were obtained, which gave an indication of the dimensional and geometric and mechanical physical properties of resistance to the stresses of the profile, so that it was possible to determine that the design of the existing head is not right.
DOI: 10.6084/m9.figshare.6857144
title: Ab initio study of electronic and structural properties of SnO2 nanoparticles under pressure

description: ABSTRACT Tin oxide (SnO2) has important applications, including as an elective material in the development of gas sensors. These devices improve their sensitivity and decrease their work temperature when the nanoparticle size is in the nanoscale order. Therefore, the gas sensor raises its efficiency noticeably. For this reason, the research of behavior at the nanoscale is essential. The total and surface formation energies of SnO2 nanoparticles (NPs) were determined by means of ab initio calculations at different concentrations and size near to 2.5 nm. The analysis shows that at higher concentration, higher structural stability is reached, in the range of 0 to 10 GPa (applied external pressures). In addition, it was possible to define a crystalline core region and a distorted layer in the NP by way of the atomic displacement study. Taking into account the importance of detecting the NP size by X-ray diffraction (XRD), the crystalline core dimension was estimated at 0 GPa. We obtained crystalline cores of 1.46 nm in the case of 1.9-, 2.0- and 2.2- concentrations, while this core was not observed at pressures of 5 and 10 GPa. Observing different regions in the densities of electronic states (DOS), we confirmed the core sizes in each NP.
DOI: 10.6084/m9.figshare.6857147.v1
title: Ultra lightweight Mg foam from recycled shavings

description: ABSTRACT Hundreds of people worldwide die or are severely maimed in collisions during traffic accidents, due to the energy transmitted to the passengers on impact. A dissipation of said energy is necessary to minimize it's effects, which can be achieved through absorbers. In recent years, metallic foams have started to be considered as energy absorbers. Metallic foams are relatively unknown structural materials, but with huge potential for applications where low weight but high rigidity are of primary interest. The use of ultralight magnesium (Mg) or magnesium alloy foams has two main advantages: less weight (more vehicle efficiency and less pollution) and impact energy absorption (less harm to passengers on board the vehicle). The machining of gearboxes made out of AZ91D magnesium alloy, generates large amounts of oilcontaminated metallic shavings. In this work, powder metallurgy is used as a recycling method of the AZ91 alloy. There were studied the conditions needed for obtaining metallic foam from recycled shavings of AZ91 and spacer (ammonium bicarbonate). The final product was characterized physically by determination of the foam's density. Also, compression tests were done to obtain values of absorbed energy, and specific absorbed energy, which characterize a metallic foam. Different metallography methods were used to characterize the structure of the sintered material. Different porosities were tested (50 and 70%). The foam's absorbed energy by unit mass [J/g] of the 50 % of porosity foam was over double compared to that of the magnesium sintered without spacer.
DOI: 10.6084/m9.figshare.6857141
title: Use of recombinant bovine somatotropin (rbST) in dairy buffaloes I: production and physicochemical composition of milk

description: ABSTRACT This study aimed to evaluate the effect of recombinant bovine somatotropin (rbST) on milk yield and the proportion of buffalo milk components during lactation. Twenty-two buffaloes randomly distributed in two experimental groups were used: Group rbST - application of 500mg rbST every 14 days, between 63 and 154 days in milk (DIM); Control Group - without treatment. Weekly, the milk yield of buffaloes was measured and a sample was collected for physicochemical analysis. The response variables were evaluated as repeated measures, using the Repeated procedure through the GLM procedure of SAS. Means of each variable after rbST and Control were: Milk yield - 6,54 vs. 6,68 kg; Fat - 6,31 vs. 6,34%; Protein - 3,86 vs. 3,81%; Lactose - 4,96 vs. 5,02%; Milk solids - 16,05 vs. 16,03%; Defatted dry matter - 9,75 vs. 9,74%; Somatic Cells Count - 329,90 vs. 171,68 (x 1000/mL); and electrical conductivity- 2,87 vs. 2,81mS/cm. The use of 500mg of rbST administered every two weeks, between 63 and 154 DIM did not affect milk yield, proportion of milk constituents and SCC of dairy buffaloes.
DOI: 10.6084/m9.figshare.6857141.v1
title: Use of recombinant bovine somatotropin (rbST) in dairy buffaloes I: production and physicochemical composition of milk

description: ABSTRACT This study aimed to evaluate the effect of recombinant bovine somatotropin (rbST) on milk yield and the proportion of buffalo milk components during lactation. Twenty-two buffaloes randomly distributed in two experimental groups were used: Group rbST - application of 500mg rbST every 14 days, between 63 and 154 days in milk (DIM); Control Group - without treatment. Weekly, the milk yield of buffaloes was measured and a sample was collected for physicochemical analysis. The response variables were evaluated as repeated measures, using the Repeated procedure through the GLM procedure of SAS. Means of each variable after rbST and Control were: Milk yield - 6,54 vs. 6,68 kg; Fat - 6,31 vs. 6,34%; Protein - 3,86 vs. 3,81%; Lactose - 4,96 vs. 5,02%; Milk solids - 16,05 vs. 16,03%; Defatted dry matter - 9,75 vs. 9,74%; Somatic Cells Count - 329,90 vs. 171,68 (x 1000/mL); and electrical conductivity- 2,87 vs. 2,81mS/cm. The use of 500mg of rbST administered every two weeks, between 63 and 154 DIM did not affect milk yield, proportion of milk constituents and SCC of dairy buffaloes.
DOI: 10.6084/m9.figshare.6857144.v1
title: Ab initio study of electronic and structural properties of SnO2 nanoparticles under pressure

description: ABSTRACT Tin oxide (SnO2) has important applications, including as an elective material in the development of gas sensors. These devices improve their sensitivity and decrease their work temperature when the nanoparticle size is in the nanoscale order. Therefore, the gas sensor raises its efficiency noticeably. For this reason, the research of behavior at the nanoscale is essential. The total and surface formation energies of SnO2 nanoparticles (NPs) were determined by means of ab initio calculations at different concentrations and size near to 2.5 nm. The analysis shows that at higher concentration, higher structural stability is reached, in the range of 0 to 10 GPa (applied external pressures). In addition, it was possible to define a crystalline core region and a distorted layer in the NP by way of the atomic displacement study. Taking into account the importance of detecting the NP size by X-ray diffraction (XRD), the crystalline core dimension was estimated at 0 GPa. We obtained crystalline cores of 1.46 nm in the case of 1.9-, 2.0- and 2.2- concentrations, while this core was not observed at pressures of 5 and 10 GPa. Observing different regions in the densities of electronic states (DOS), we confirmed the core sizes in each NP.
DOI: 10.6084/m9.figshare.6857138
title: Study of the antifungal activity of materials containing coal from disused batteries

description: ABSTRACT The large number of batteries that are discarded and the environmental impact that the inadequate disposition of the waste of the same produces impelled to its recycling. Both alkaline and zinc-carbon batteries have as their main components zinc and carbon mixed with other oxides, in their internal fill. In this work, the silica synthesis was carried out using the sol-gel method from the tetraethylorthosilicate precursor and the ammonium hydroxide catalyst, carbon from the recycling of disused batteries was added in 0.1, 1.0 and 10.0 C % (w/w), respectively. This support was functionalized by 3-aminopropyltriethoxysilane in a 1: 1 ratio and subsequently it was impregnated by the incipient wetness with silver nitrate, resulting in 1 and 2% Ag (w/v) adsorbed. These solids were characterized by SBET, DRX, potentiometric titration, SEM-EDX and TEM techniques. The antifungal activity of the solids was assessed against the fungi Chaetomium globosum, Aspergillus sp. and Cladosporium sp. by plaque inhibition test. The best results obtained showed a degree of inhibition close to 100% against Cladosporium sp. with samples impregnated at both Ag concentrations. In a next stage modifications will be made in the synthesis of the siliceous material to increase its antifungal effectiveness.