cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.7510946.v1
title: GIS-based analysis of geo-resources and geo-hazards for urban areas - the example of the northern periphery of Belo Horizonte (capital of Minas Gerais, Brazil)

description: Abstract Easily understandable thematic maps of geo-scientific parameters are important for land use decision making. If several parameters are relevant and have to be compared, it is important that they are consistent with each other, available at the same spatial range and detail and normed to a common data range. In the current study, geological and topographical data have been used to derive a set of 90 geo-scientific maps for an area of 400 km² in the northern part of the metropolitan area of Belo Horizonte. Each parameter has been transferred to a common data range between 0 and 1 using a Semantic Import Model strategy and afterwards combined to derive new parameters for soil hydrology and hydrogeology. From these, many intermediate geo-scientific parameters, maps of geo-resources (sand/gravel, carbonates, fertile soils) and geo-hazards (erosion, groundwater pollution) have been derived that they can be used as base information for a participatory and sustainable land use planning. The workflow is transparently stored in GIS-tools and can be modified and updated if new information is available.
DOI: 10.6084/m9.figshare.7516883.v1
title: Temperature influence in cornstarch gelatinization for froth flotation

description: Abstract Starches are widely used as depressant in froth flotation operations in Brazil due to their efficiency, increasing the selectivity in the inverse flotation of quartz, depressing iron ore. The starch market has been growing and improving in recent years, leading to better products attending the requirements of the mineral industry. The major source of starch used for iron ore is the cornstarch, which needs to be gelatinized, by heat or sodium hydroxide (NaOH) addition (also known as caustisized starch), prior its use. This stage has a direct impact on industrials costs, since the lower consumption of NaOH in gelatinization provides better control of the pH in the froth flotation and reduces the amount of electrolytes present in the pulp. In order to evaluate the influence of temperature on the NaOH consumption, gelatinization tests were carried out with temperatures ranging from 25 to 65 ºC, measuring the volume of NaOH. All tests were performed in triplicate. A linear model correlating the temperature and the NaOH need for the cornstarch gelatinization has been stablished. This model can allow mineral industries to optimize the NaOH amount used to prepare the depressant used in froth flotation. For example, the reduction in NaOH could easily reach 480 L per ton of cornstarch when performing gelatinization with the cornstarch solution at 35 ºC instead of 25 ºC (reduction of approximately 34% in the NaOH consumed).
DOI: 10.6084/m9.figshare.11452200
title: Geochemical assessment of platinum group metals for phytomining

description: Abstract Phytomining is suggested as a technology to obtain platinum group metals (PGMs) nanoparticles from plants grown on the mineralized soils or tailings. Samples from North American Palladium (Canada) and gossans from Broken Hill (BH) (Australia) were studied to assess the possibility of using these PGM-rich samples as substrates for phytomining. The bioavailability of PGMs was indirectly assessed using geochemical procedures. The selective extractions showed that the highest available concentration of Pd is 5.38 ppm in BH gossan 1. The extraction of PGMs by ammonium acetate, fulvic acid or citrate-dithionite indicates natural availability to plants. The BH gossan 1 was the best of the five studied samples for phytomining of Pd due to available Pd concentration (&gt; 2 mg/kg), low Electric Conductivity (&lt; 2dS/m), high CEC (Cation Exchange Capacity) (38.8 meq/100g), and proper pH (6.5). Cu-tolerant plant species should be chosen to grow on BH gossan 1. A criterium for choosing substrates for phytomining of Pd was developed comprising various classical soil parameters plus selective extraction procedures.
DOI: 10.6084/m9.figshare.11452200.v1
title: Geochemical assessment of platinum group metals for phytomining

description: Abstract Phytomining is suggested as a technology to obtain platinum group metals (PGMs) nanoparticles from plants grown on the mineralized soils or tailings. Samples from North American Palladium (Canada) and gossans from Broken Hill (BH) (Australia) were studied to assess the possibility of using these PGM-rich samples as substrates for phytomining. The bioavailability of PGMs was indirectly assessed using geochemical procedures. The selective extractions showed that the highest available concentration of Pd is 5.38 ppm in BH gossan 1. The extraction of PGMs by ammonium acetate, fulvic acid or citrate-dithionite indicates natural availability to plants. The BH gossan 1 was the best of the five studied samples for phytomining of Pd due to available Pd concentration (&gt; 2 mg/kg), low Electric Conductivity (&lt; 2dS/m), high CEC (Cation Exchange Capacity) (38.8 meq/100g), and proper pH (6.5). Cu-tolerant plant species should be chosen to grow on BH gossan 1. A criterium for choosing substrates for phytomining of Pd was developed comprising various classical soil parameters plus selective extraction procedures.
DOI: 10.6084/m9.figshare.6388007.v1
title: Relationships between rainfall and throughfall in a secondary forest in southeastern Brazil: an evaluation of different statistical models

description: ABSTRACT Throughfall (TF) is influenced by different meteorological conditions, which can result in high spatial and temporal variability, when interacting with vegetation and mutually with each other. This study aimed to evaluate rainfall (RF) influence on TF, as well as to describe the behavior of these variables in an area dominated by Pinus elliottii in southeastern Brazil, by exploring different statistical models proposed in the literature. For this, RF and TF data were recorded in 24 rainfall events by 180 gauges distributed in six 10 x 10 m plots. The results indicate a significant influence of RF volume on response variables [TF volume (TFmm), TF fraction (TF%) and coefficient of variation of TF (CVTF)]. While the linear model presented the best fit for TFmm , the non-linear models had better results for TF% and CVTF as a function of RF, allowing the identification of distinct behaviors for different RF volumes. In general, it was verified that RF is the main source of variability in TF estimates in the study area. However, it should be noted that other variables may be acting simultaneously on TF% and CVTF, in which 45.4 and 38.1% of the variation, respectively, remain unexplained, requiring complementary studies to identify and quantify the influence of other factors.
DOI: 10.6084/m9.figshare.6151361
title: Analysis of the longitudinal distribution of pressures near the ends of the vertical and horizontal faces in stepped spillway of slope 1V: 0.75H

description: ABSTRACT Stepped spillways have been widely used for flood runoff due to of their constructive advantages and in regards to energy dissipation during the drop, allowing downstream dissipation structures to be designed in smaller dimensions. Due to the need for further studies on the effect of runoff in the chute of the stepped spillway and the analysis of dimensionless numbers used to characterize the longitudinal distribution of the pressures acting on the faces of the steps of a spillway, this study aims to characterize the acting forces on the steps of said spillways. Analyses were performed on a physical model of spillway with a slope of 1V: 0.75H and steps with a height of 6 centimeters. The pressure fields on the steps were analyzed and compared with results found in literature. As a general finding concerning the pressure in the horizontal faces, it was ascertained that the traction and the compression loads have relatively similar magnitudes, the negative pressures being more intense. Regarding the maximum pressures at the horizontal faces of the steps, it should be emphasized that the maximum values of compression have occurred at the end of the chute and that the lower discharges yielded higher values of pressure coefficients.
DOI: 10.6084/m9.figshare.6387989
title: Comparison the monitoring data of an on-site stormwater detention (OSD) and the results in the use of theoretical methods for its design

description: ABSTRACT On-site stormwater detention – OSD has been constructed in big Brazilian cities, as a way to reduce the impact of urbanization on the drainage system. However, there are a few studies about its efficiency in real scale. This article aims to compare the monitoring data of an OSD built in a hospital in Belo Horizonte and the results determined by theoretical methods, commonly used in the design of this structure. Inside the OSD was installed a level sensor to monitor water level during rain events. The data was recorded on a data logger every 30 seconds during the period April 2015 to March 2017. It was analyzed the OSD filling during the occurrence of 48 precipitation events. In the maximum heights of water level comparison, it was found that the monitored values were higher than theoretical values and the results using Rational Method were closer to monitoring data than the results with SCS-HU Method. It was also found that the peak and recession time calculated with Rational Method represented better the water levels monitored.
DOI: 10.6084/m9.figshare.6387989.v1
title: Comparison the monitoring data of an on-site stormwater detention (OSD) and the results in the use of theoretical methods for its design

description: ABSTRACT On-site stormwater detention – OSD has been constructed in big Brazilian cities, as a way to reduce the impact of urbanization on the drainage system. However, there are a few studies about its efficiency in real scale. This article aims to compare the monitoring data of an OSD built in a hospital in Belo Horizonte and the results determined by theoretical methods, commonly used in the design of this structure. Inside the OSD was installed a level sensor to monitor water level during rain events. The data was recorded on a data logger every 30 seconds during the period April 2015 to March 2017. It was analyzed the OSD filling during the occurrence of 48 precipitation events. In the maximum heights of water level comparison, it was found that the monitored values were higher than theoretical values and the results using Rational Method were closer to monitoring data than the results with SCS-HU Method. It was also found that the peak and recession time calculated with Rational Method represented better the water levels monitored.
DOI: 10.6084/m9.figshare.7020500
title: The case of the Paraisópolis Complex management: conceptual differences of the slums intervention programs in São Paulo

description: Abstract The paper presents and analyzes the urban interventions led by the government in Paraisópolis Complex, São Paulo, in the period between 2001-2016, during the administrations of Marta Suplicy (2001-2004), José Serra (2005-2006), Gilberto Kassab (2006-2012) and Fernando Haddad (2013-2016). Paraisópolis Complex is the second largest slum in São Paulo, with approximately 60,000 people and about 18,000 households. The area was an old farmhouse, which in 1921 was split in 2,200 lots. The road structure, unsuited to topography, resulted in slope greater than 40%, imparing the occupation of lots, invaded since 1970. We present the urban interventions carried out in Paraisópolis during four municipal administrations, qualitatively analyze the differences and similarities between them, to understand and characterize the recent practices of the government. Our results, especially the specializations of the interventions, made it possible to perceive the difficulties and fragility involved in the intervention dynamics in precarious settlements, since many projects represent, in practice, forced evictions because they constitute incomplete actions. Thus, through the analysis of Paraisópolis, this paper discusses the major impasses, limits and social implications that limit restrict the effectiveness of intervention programs in slums, which are still extraterritorial issues, mostly political.
DOI: 10.6084/m9.figshare.6151361.v1
title: Analysis of the longitudinal distribution of pressures near the ends of the vertical and horizontal faces in stepped spillway of slope 1V: 0.75H

description: ABSTRACT Stepped spillways have been widely used for flood runoff due to of their constructive advantages and in regards to energy dissipation during the drop, allowing downstream dissipation structures to be designed in smaller dimensions. Due to the need for further studies on the effect of runoff in the chute of the stepped spillway and the analysis of dimensionless numbers used to characterize the longitudinal distribution of the pressures acting on the faces of the steps of a spillway, this study aims to characterize the acting forces on the steps of said spillways. Analyses were performed on a physical model of spillway with a slope of 1V: 0.75H and steps with a height of 6 centimeters. The pressure fields on the steps were analyzed and compared with results found in literature. As a general finding concerning the pressure in the horizontal faces, it was ascertained that the traction and the compression loads have relatively similar magnitudes, the negative pressures being more intense. Regarding the maximum pressures at the horizontal faces of the steps, it should be emphasized that the maximum values of compression have occurred at the end of the chute and that the lower discharges yielded higher values of pressure coefficients.
DOI: 10.6084/m9.figshare.7020500.v1
title: The case of the Paraisópolis Complex management: conceptual differences of the slums intervention programs in São Paulo

description: Abstract The paper presents and analyzes the urban interventions led by the government in Paraisópolis Complex, São Paulo, in the period between 2001-2016, during the administrations of Marta Suplicy (2001-2004), José Serra (2005-2006), Gilberto Kassab (2006-2012) and Fernando Haddad (2013-2016). Paraisópolis Complex is the second largest slum in São Paulo, with approximately 60,000 people and about 18,000 households. The area was an old farmhouse, which in 1921 was split in 2,200 lots. The road structure, unsuited to topography, resulted in slope greater than 40%, imparing the occupation of lots, invaded since 1970. We present the urban interventions carried out in Paraisópolis during four municipal administrations, qualitatively analyze the differences and similarities between them, to understand and characterize the recent practices of the government. Our results, especially the specializations of the interventions, made it possible to perceive the difficulties and fragility involved in the intervention dynamics in precarious settlements, since many projects represent, in practice, forced evictions because they constitute incomplete actions. Thus, through the analysis of Paraisópolis, this paper discusses the major impasses, limits and social implications that limit restrict the effectiveness of intervention programs in slums, which are still extraterritorial issues, mostly political.
DOI: 10.6084/m9.figshare.7513469
title: Belém, in the State of Pará: city and water

description: This paper deals with Belém, in the State of Pará, Northern Brazil, a city where hydrography has been conditioning and defining the urban morphology, land uses, and the attributes of economic activities arranged territorially. Studying historical cases and contemporary urbanization phenomena close to water bodies (rivers, a bay, an estuary), it is possible to notice the dimension of water as landscape, vehicle, substance and resource. At the same time, waterfronts, hub ports, environmental engineering and water management represent cases of materialization and deepening of vetoes on the access to water and to the urban environment in general, in spite of the directives of the current environmental policy.
DOI: 10.6084/m9.figshare.7513469.v1
title: Belém, in the State of Pará: city and water

description: This paper deals with Belém, in the State of Pará, Northern Brazil, a city where hydrography has been conditioning and defining the urban morphology, land uses, and the attributes of economic activities arranged territorially. Studying historical cases and contemporary urbanization phenomena close to water bodies (rivers, a bay, an estuary), it is possible to notice the dimension of water as landscape, vehicle, substance and resource. At the same time, waterfronts, hub ports, environmental engineering and water management represent cases of materialization and deepening of vetoes on the access to water and to the urban environment in general, in spite of the directives of the current environmental policy.
DOI: 10.6084/m9.figshare.7515824
title: COMPARISON BETWEEN TWO FEEDING RATES AND THREE FEEDING FREQUENCIES FOR HYBRID SURUBIMS REARED IN CAGES

description: ABSTRACT This study evaluated the effects of feeding frequency and feeding rate on productive performance of hybrid surubims reared in cages with automatic feeding. Three feeding frequencies (6, 12 and 24 meals day-1), and two feeding rates (4% and 8% of body weight per day, BW day-1) were evaluated. Hybrid surubims (Pseudoplatystoma corruscans × Pseudoplatystoma fasciatum) with average weights of 24.20 ± 0.80 g were distributed in 18 cages of 1.0 m³ at a density of 60 fish m-3. Fish were fed commercial ration containing 40% crude protein, and feeding took place at night using automatic feeders. The study lasted 47 days. With a feeding rate of 4% BW day-1, the final weight (FW) of the surubims was higher when feed was supplied as 24 meals day-1 (66.92 g). However, using 8% BW day-1, the FW was greater with a feeding frequency of 12 meals day-1 (106.90 g). Regardless of feed frequency, the values of daily weight gain and standard length of surubims were higher with the feeding rate of 8% BW day-1. Therefore, the feeding rate of 8% BW day-1, provided in 12 meals day-1, provided better productive performance for hybrid surubims (Pseudoplatystoma corruscans × Pseudoplatystoma fasciatum) reared in cages.
DOI: 10.6084/m9.figshare.7515824.v1
title: COMPARISON BETWEEN TWO FEEDING RATES AND THREE FEEDING FREQUENCIES FOR HYBRID SURUBIMS REARED IN CAGES

description: ABSTRACT This study evaluated the effects of feeding frequency and feeding rate on productive performance of hybrid surubims reared in cages with automatic feeding. Three feeding frequencies (6, 12 and 24 meals day-1), and two feeding rates (4% and 8% of body weight per day, BW day-1) were evaluated. Hybrid surubims (Pseudoplatystoma corruscans × Pseudoplatystoma fasciatum) with average weights of 24.20 ± 0.80 g were distributed in 18 cages of 1.0 m³ at a density of 60 fish m-3. Fish were fed commercial ration containing 40% crude protein, and feeding took place at night using automatic feeders. The study lasted 47 days. With a feeding rate of 4% BW day-1, the final weight (FW) of the surubims was higher when feed was supplied as 24 meals day-1 (66.92 g). However, using 8% BW day-1, the FW was greater with a feeding frequency of 12 meals day-1 (106.90 g). Regardless of feed frequency, the values of daily weight gain and standard length of surubims were higher with the feeding rate of 8% BW day-1. Therefore, the feeding rate of 8% BW day-1, provided in 12 meals day-1, provided better productive performance for hybrid surubims (Pseudoplatystoma corruscans × Pseudoplatystoma fasciatum) reared in cages.
DOI: 10.6084/m9.figshare.10295615
title: Metropolitan planning and large urban projects: conception and mismatches of the new centralities policy in the Metropolitan Region of Belo Horizonte

description: Abstract In recent decades, two processes have characterized the urban policy and urban dynamics of the Metropolitan Region of Belo Horizonte (MRBH): the resumption of metropolitan planning and the greater intensity of large urban projects (LUPs). This paper critically investigates the relationships between a set of LUPs, executed and/or designed between 2000 and 2018, and the planning under construction, with emphasis on projects for centralities in the north and south vectors of MRBH. To this end, it articulates the analysis of the LUPs’ field of power with the analysis of the planning process. The conclusions highlight approximations, contradictions and mismatches between planning, the State Government and real estate capital, especially regarding the new centralities policy.
DOI: 10.6084/m9.figshare.10295615.v1
title: Metropolitan planning and large urban projects: conception and mismatches of the new centralities policy in the Metropolitan Region of Belo Horizonte

description: Abstract In recent decades, two processes have characterized the urban policy and urban dynamics of the Metropolitan Region of Belo Horizonte (MRBH): the resumption of metropolitan planning and the greater intensity of large urban projects (LUPs). This paper critically investigates the relationships between a set of LUPs, executed and/or designed between 2000 and 2018, and the planning under construction, with emphasis on projects for centralities in the north and south vectors of MRBH. To this end, it articulates the analysis of the LUPs’ field of power with the analysis of the planning process. The conclusions highlight approximations, contradictions and mismatches between planning, the State Government and real estate capital, especially regarding the new centralities policy.
DOI: 10.6084/m9.figshare.7452854
title: SOIL MICROBIOLOGICAL ACTIVITY AND PRODUCTIVITY OF MAIZE FODDER WITH LEGUMES AND MANURE DOSES

description: ABSTRACT Maize is an important cereal and it is widely consumed in the world, both as food for humans and animals. Nitrogen (N) is a nutrient required in large quantities by maize, but unfortunately, soils are limited in meeting this need. Nodulating legumes can serve as a source of Nitrogen, because they are symbiotically associated with bacteria capable of fixing atmospheric N. Another important source of this nutrient is cattle manure, which is widely used in agriculture. The objective of the present study was to evaluate the effect of using legumes and cattle manure on the production as well as the microbial and biochemical quality of the soil used for maize cultivation. The experiment was conducted using a randomized complete block design, in a sub-subdivided plot scheme [(2x4) +2], two leguminous plants (pigeon pea and macassar bean), four doses of cattle manure (0, 20, 40 and 60 t ha-1) and two controls; one with mineral fertilization and the other cultivated without the use of fertilizers. Treatment using a manure dose of 60t ha-1 and pigeon pea legume, recorded higher dry mass production per plant. The increase in manure doses was directly proportional to the length and weight of the cobs for the two legumes. The enzymatic activities were affected by the different doses and legumes, with greater results being recorded at the 60 t ha-1 dose with the macassar legume. The use of legumes with manure improved maize production as well as the microbiological and biochemical quality of soils.