cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.7519436.v1
title: Teak Stump Sprouting Capacity Under Compound Coppice Regime Process

description: ABSTRACT This work aimed to evaluate the teak stump sprouting capacity under compound coppice process. The experiment was implemented at spacing of 3.0 × 2.0 m and 3.0 × 3.0 m. At 8-years old, the experiment was systematically thinned in 50%. After thinning, with new spacing of 3.0 × 4.0 m and 3.0 × 6.0 m, the stump sprouting capacity of the thinned trees was evaluated. The experimental design used was randomized blocks, whit two treatments and 5 repetitions. The treatments were T1 = conduced sprouting under compound coppice process at the spacing 3.0 × 4.0 m and T2 = conduced sprouting under compound coppice at the spacing 3.0 × 6.0 m. Teak presented sprouting capacity under compound coppice until 12-years old for both treatments.
DOI: 10.6084/m9.figshare.7677695
title: Behavior of the chromite tailings in a centrifugal concentrator (FALCON)

description: Abstract The application of the centrifugal concentration gains importance in the world scenario, considering the low environmental impact and the concentration of fine particles. Literature does not present articles using centrifugal concentration (Falcon) for chromite. The material used in the tests is the tailings from a Northeastern Brazil concentration plant, which was homogenized in the laboratory. In the process assays, the number of G (25-300 G) and the fluidization water pressure (20-100 kPa) were optimized. The initial tests used a wide range of particle size of 1 kg mass, with the "best results" being for 50 and 100 G at a pressure of 60 and 80 kPa, respectively, where a metallurgical recovery of 25% and grade close to 20% of Cr2O3 were obtained. The amount of mass showed to be a significant variable in the process, being 250 g the ideal for the material used, which obtained considerable recoveries, even though the grade is still low. These results led to a cut at 250 µm, considering that the liberation of the chromite is of the order of 77 %. The best result was with 150 G and fluidization water pressure of 60 kPa for a metallurgical recovery of 72% and a grade of 28% Cr2O3.
DOI: 10.6084/m9.figshare.7677695.v1
title: Behavior of the chromite tailings in a centrifugal concentrator (FALCON)

description: Abstract The application of the centrifugal concentration gains importance in the world scenario, considering the low environmental impact and the concentration of fine particles. Literature does not present articles using centrifugal concentration (Falcon) for chromite. The material used in the tests is the tailings from a Northeastern Brazil concentration plant, which was homogenized in the laboratory. In the process assays, the number of G (25-300 G) and the fluidization water pressure (20-100 kPa) were optimized. The initial tests used a wide range of particle size of 1 kg mass, with the "best results" being for 50 and 100 G at a pressure of 60 and 80 kPa, respectively, where a metallurgical recovery of 25% and grade close to 20% of Cr2O3 were obtained. The amount of mass showed to be a significant variable in the process, being 250 g the ideal for the material used, which obtained considerable recoveries, even though the grade is still low. These results led to a cut at 250 µm, considering that the liberation of the chromite is of the order of 77 %. The best result was with 150 G and fluidization water pressure of 60 kPa for a metallurgical recovery of 72% and a grade of 28% Cr2O3.
DOI: 10.6084/m9.figshare.10073354
title: EFFECT OF PRE-SLAUGHTER CONFINEMENT STRESS ON PHYSICOCHEMICAL PARAMETERS OF CHICKEN MEAT

description: Abstract The effect of pre-slaughter lairage stress on biogenic amines, pH, and color with the CIELab system (where three variables L*, a*, b* are estimated: L* for lightness, a* defines redness, and b* defines yellowness) in chicken breast meat was investigated. Before slaughtering, 25 broilers were selected and divided into five groups according to lairage holding time (30 min or 3 h), day/night schedule (daylight or nighttime) and control (no lairage). After slaughtering, breasts (M. Pectoralis major) were removed, stored for 9 days at 4 °C, and analyzed every 3 days. The results showed a pH decrease during nighttime holding. Also, a three-hour pre-slaughter holding (daytime or night) resulted in high biogenic amine concentration, increase in lightness (L*), and reduction in redness (a*) during storage. Cadaverine concentration showed a rapid increase from day 6 onward. The time and schedule of chicken lairage is a pre-slaughter stress factor that affects meat quality. Based on these observations, it is recommended to slaughter chickens immediately on arrival at the processing plants.
DOI: 10.6084/m9.figshare.11390664.v1
title: STRUCTURAL AND PRODUCTIVE CHARACTERISTICS IN INTRASPECIFIC AND INTERSPECIFIC HYBRIDS OF ELEPHANTGRASS

description: Abstract The objective of this study was to evaluate the structure and forage production of hybrids of elephant-grass managed under cut. Twenty-four clones of elephant-grass from Embrapa dairy cattle were used as treatments, and Cameroom as a control. The grasses were cut close to the ground, every 60 days. The parameters evaluated were yield and dry matter content, number of basal tillers, number of leaves per tiller, plant height, stem diameter. The highest height of the plants was observed in clone CNPGL 00-103-1. The group with the highest number of tillers had three clones and a mean of 39.38 tiller m-2. In the group of clones CNPGL 00-103-1, CNPGL 93-25-3, CNPGL 00-16-1 and CNPGL 00-90-3 the highest dry matter contents (22.7% DM) were observed. The highest masses of forage, leaf blade and stem were observed in clone CNPGL 00-214, 15852 and 6195 kg ha-1 DM, respectively. The highest leaf blade / stem ratio was of the CNPGL 00-201-1 clone, and only in this did the leaf blade mass exceed that of the stem. Clone CNPGL 00-214 showed to be more productive, with high tillering capacity and forage accumulation.
DOI: 10.6084/m9.figshare.6152333
title: Application of methodology for the adequacy of the electrical motor's power sizing: permanent and transient analysis

description: Abstract The suitability of the motive force contributes to the efficient use of electrical energy. On the other hand, the inadequate size of electric motors is directly connected to increased investment and running costs. This article presents the theory and mainly the application of a methodology for the adequacy of the motive power. The research was conducted at the Federal University of Viçosa dairy factory. This methodology consists in measuring motor rotation, acquiring technical information from the manufacturer's manual, and identifying the type of motor load. In addition, it uses the linearization method to estimate the resistance torque in steady state. This step is achieved without the need for using additional equipment or sending the motor to a laboratory for measuring the torque. In this sense, the studies can be made during the production process. Thus, this relevant methodology has the advantage of allowing the studies to be carried out at the agro-industry facilities. After getting all the information described above, it was possible to determine whether each motor at the factory was oversized. Then, the suitable motor was selected according to the load type. The application of the methodology described herein could provide around 50.6% savings in the monthly electricity costs at the dairy factory, and an attractive internal return rate.
DOI: 10.6084/m9.figshare.6152333.v1
title: Application of methodology for the adequacy of the electrical motor's power sizing: permanent and transient analysis

description: Abstract The suitability of the motive force contributes to the efficient use of electrical energy. On the other hand, the inadequate size of electric motors is directly connected to increased investment and running costs. This article presents the theory and mainly the application of a methodology for the adequacy of the motive power. The research was conducted at the Federal University of Viçosa dairy factory. This methodology consists in measuring motor rotation, acquiring technical information from the manufacturer's manual, and identifying the type of motor load. In addition, it uses the linearization method to estimate the resistance torque in steady state. This step is achieved without the need for using additional equipment or sending the motor to a laboratory for measuring the torque. In this sense, the studies can be made during the production process. Thus, this relevant methodology has the advantage of allowing the studies to be carried out at the agro-industry facilities. After getting all the information described above, it was possible to determine whether each motor at the factory was oversized. Then, the suitable motor was selected according to the load type. The application of the methodology described herein could provide around 50.6% savings in the monthly electricity costs at the dairy factory, and an attractive internal return rate.
DOI: 10.6084/m9.figshare.10073354.v1
title: EFFECT OF PRE-SLAUGHTER CONFINEMENT STRESS ON PHYSICOCHEMICAL PARAMETERS OF CHICKEN MEAT

description: Abstract The effect of pre-slaughter lairage stress on biogenic amines, pH, and color with the CIELab system (where three variables L*, a*, b* are estimated: L* for lightness, a* defines redness, and b* defines yellowness) in chicken breast meat was investigated. Before slaughtering, 25 broilers were selected and divided into five groups according to lairage holding time (30 min or 3 h), day/night schedule (daylight or nighttime) and control (no lairage). After slaughtering, breasts (M. Pectoralis major) were removed, stored for 9 days at 4 °C, and analyzed every 3 days. The results showed a pH decrease during nighttime holding. Also, a three-hour pre-slaughter holding (daytime or night) resulted in high biogenic amine concentration, increase in lightness (L*), and reduction in redness (a*) during storage. Cadaverine concentration showed a rapid increase from day 6 onward. The time and schedule of chicken lairage is a pre-slaughter stress factor that affects meat quality. Based on these observations, it is recommended to slaughter chickens immediately on arrival at the processing plants.
DOI: 10.6084/m9.figshare.8324528
title: Racial Issues for Children: resistance and denunciation of the unsaid

description: Abstract: This text is the result of research conducted between 2014 and 2016 in a day care center linked to a federal institution in Rio de Janeiro, which dealt with the effects of an antiracist education on the subjectivity of children. We start from the premise that children understand and reinterpret the world in their interactions through peer culture. This article, in turn, aims to identify the aspects resulting from CNE / CP 003/2004, Law 10.639 / 2003 on the educational practices of early childhood education, and to discuss how racial issues influence the experience of pedagogical practices in educational spaces geared to childhood. The study concluded that although the crèche analyzed conforms to the legislation when inserting the theme of ethno-racial relations as a tactic for education, it is still necessary the presence of a technical body aware of the education antiracist.
DOI: 10.6084/m9.figshare.7513838
title: Phonological knowledge of rhotics in English L2 of brazilian speakers

description: Abstract This article discusses the appropriation of rhotics in English-L2 spoken by Brazilian speakers. The results show that rhotics are quickly incorporated into the English-L2 speakers' production. A detailed examination of the data indicates that the following factors are relevant in the appropriation of retroflex approximant in English-L2: proficiency, the individual (learner) and the lexical item. The fact that the appropriation of the retroflex approximant quickly achieves excellent levels in English-L2 spoken by Brazilian speakers suggests that teaching of pronunciation is specific and not global. Based on Multirepresentational Models, it is argued that grammatical knowledge is a dynamic construct, interlaced by various linguistic and non-linguistic factors.
DOI: 10.6084/m9.figshare.7513838.v1
title: Phonological knowledge of rhotics in English L2 of brazilian speakers

description: Abstract This article discusses the appropriation of rhotics in English-L2 spoken by Brazilian speakers. The results show that rhotics are quickly incorporated into the English-L2 speakers' production. A detailed examination of the data indicates that the following factors are relevant in the appropriation of retroflex approximant in English-L2: proficiency, the individual (learner) and the lexical item. The fact that the appropriation of the retroflex approximant quickly achieves excellent levels in English-L2 spoken by Brazilian speakers suggests that teaching of pronunciation is specific and not global. Based on Multirepresentational Models, it is argued that grammatical knowledge is a dynamic construct, interlaced by various linguistic and non-linguistic factors.
DOI: 10.6084/m9.figshare.8324528.v1
title: Racial Issues for Children: resistance and denunciation of the unsaid

description: Abstract: This text is the result of research conducted between 2014 and 2016 in a day care center linked to a federal institution in Rio de Janeiro, which dealt with the effects of an antiracist education on the subjectivity of children. We start from the premise that children understand and reinterpret the world in their interactions through peer culture. This article, in turn, aims to identify the aspects resulting from CNE / CP 003/2004, Law 10.639 / 2003 on the educational practices of early childhood education, and to discuss how racial issues influence the experience of pedagogical practices in educational spaces geared to childhood. The study concluded that although the crèche analyzed conforms to the legislation when inserting the theme of ethno-racial relations as a tactic for education, it is still necessary the presence of a technical body aware of the education antiracist.
DOI: 10.6084/m9.figshare.11390646
title: HOW DO AGE TILLER AND NITROGEN FERTILIZING MODIFY THE STRUCTURAL CHARACTERISTICS OF DEFERRED MARANDU PALISADE GRASS?

description: Abstract The structural characteristics of tillers with different ages of deferred and fertilized marandu palisade grass (Urochloa brizantha cv. Marandu) were evaluated. Two doses of nitrogen (low, 50 kg ha-1 and high, 200 kg ha-1), three age categories of tillers (young, &lt;2 months, mature, 2 to 4 months, and old,&gt; 4 months), and to two periods (beginning, 1 to 45 days and end, 46 to 90) during deferral were evaluated. The experimental design was completely randomized, in a subsubdivide plot scheme, with four replications. In general, young tiller had a better morphological composition (40.0% live leaf, P=0.0074; 39.2% live stem, P=0.0208; and 20.8% dead leaf blade, P=0.0155), while the old tiller had a worse morphology (7.3% live leaf, 54.8% live stem and 38.0% leaf dead) at the end of the deferral period. The percentage of old tillers was higher (P=0.0019) at the end (54.0%) than at the beginning (43.4%) of the deferment period. At the beginning of the deferment the canopy fertilized with high dose of N presented (P=0.0447) a higher percentage of young tiller (36.8%) than that under low N dose (28.6%). At the end of the deferment period, both the high and the low nitrogen doses resulted (P=0.0276) in similar values of young tiller in the deferred canopy (24.3%, on average). The higher N dose, plotted before the deferral period, increases the percentage of young tiller during the initial phase of deferment. Young tiller has better structural characteristics than mature and old tiller.
DOI: 10.6084/m9.figshare.7514765
title: Performance in vitro of apex locators in determining root length in primary molars

description: ABSTRACT Objective: The aim of the study was to evaluate performance of digital radiographic and two electronic apex locators, Propex II and Root ZX in root canal length determination in primary molars. Methods: 25 primary molars were divided into two groups, G1 without root resorption and G2 with root resorption. The exams were performed using all methods by two experienced examiners, with 1-week interval. The gold standard was determined by visual examination. The methods were statistically analyzed regarding the values of reproducibility and correlated with the gold standard by Pearson´s correlation coefficient. Results: The root canal length determination coincided with gold standard in 22.7% for Root ZX, 17.5% for Propex II and 12.5% for digital radiography. Correlation values were higher in G1, the Root ZX presented the highest values. In G2 the digital radiography showed the lowest correlation. In G1, the intra-examiner reproducibility values ranged from 0.925 to 0.523, and interexaminer 0.863 to 0.670. In G2, the values of intra-examiner reproducibility ranges from 0.864 to 0.097, and inter was 0.774 to 0.379. Conclusion: It was concluded that the methods performance varying according to examiner's experience. The Root ZX presented the highest reproducibility and accuracy.
DOI: 10.6084/m9.figshare.11390646.v1
title: HOW DO AGE TILLER AND NITROGEN FERTILIZING MODIFY THE STRUCTURAL CHARACTERISTICS OF DEFERRED MARANDU PALISADE GRASS?

description: Abstract The structural characteristics of tillers with different ages of deferred and fertilized marandu palisade grass (Urochloa brizantha cv. Marandu) were evaluated. Two doses of nitrogen (low, 50 kg ha-1 and high, 200 kg ha-1), three age categories of tillers (young, &lt;2 months, mature, 2 to 4 months, and old,&gt; 4 months), and to two periods (beginning, 1 to 45 days and end, 46 to 90) during deferral were evaluated. The experimental design was completely randomized, in a subsubdivide plot scheme, with four replications. In general, young tiller had a better morphological composition (40.0% live leaf, P=0.0074; 39.2% live stem, P=0.0208; and 20.8% dead leaf blade, P=0.0155), while the old tiller had a worse morphology (7.3% live leaf, 54.8% live stem and 38.0% leaf dead) at the end of the deferral period. The percentage of old tillers was higher (P=0.0019) at the end (54.0%) than at the beginning (43.4%) of the deferment period. At the beginning of the deferment the canopy fertilized with high dose of N presented (P=0.0447) a higher percentage of young tiller (36.8%) than that under low N dose (28.6%). At the end of the deferment period, both the high and the low nitrogen doses resulted (P=0.0276) in similar values of young tiller in the deferred canopy (24.3%, on average). The higher N dose, plotted before the deferral period, increases the percentage of young tiller during the initial phase of deferment. Young tiller has better structural characteristics than mature and old tiller.
DOI: 10.6084/m9.figshare.11452176
title: Dimensional design of the barometric leg of a flotation column: a key to operational stability

description: Abstract The inefficiency in controlling the slurry/froth interface level of a scavenger column flotation stage was severely impairing the process performance of an iron mining company, increasing the iron content in the tailings to levels above 20% and, consequently, not meeting the company's iron recovery and pellet feed production targets. Based on mass balance and process data, hydraulic calculations were performed and showed that the installed 6.0" (15.24cm) diameter barometric leg tubes and the control system valve were adequate. An equation to determine the maximum barometric leg height was developed for the flotation column and other calculations showed the necessity to reduce this height from 4.6m to a maximum of 3.4m. The barometric leg adequacy considerably decreased the variability in controlling the slurry/froth interface level, reduced the iron content in the tailings from 24.9% to 18.9% and increased the iron recovery in the flotation stage from 97.9% to 98.7%.
DOI: 10.6084/m9.figshare.7514765.v1
title: Performance in vitro of apex locators in determining root length in primary molars

description: ABSTRACT Objective: The aim of the study was to evaluate performance of digital radiographic and two electronic apex locators, Propex II and Root ZX in root canal length determination in primary molars. Methods: 25 primary molars were divided into two groups, G1 without root resorption and G2 with root resorption. The exams were performed using all methods by two experienced examiners, with 1-week interval. The gold standard was determined by visual examination. The methods were statistically analyzed regarding the values of reproducibility and correlated with the gold standard by Pearson´s correlation coefficient. Results: The root canal length determination coincided with gold standard in 22.7% for Root ZX, 17.5% for Propex II and 12.5% for digital radiography. Correlation values were higher in G1, the Root ZX presented the highest values. In G2 the digital radiography showed the lowest correlation. In G1, the intra-examiner reproducibility values ranged from 0.925 to 0.523, and interexaminer 0.863 to 0.670. In G2, the values of intra-examiner reproducibility ranges from 0.864 to 0.097, and inter was 0.774 to 0.379. Conclusion: It was concluded that the methods performance varying according to examiner's experience. The Root ZX presented the highest reproducibility and accuracy.
DOI: 10.6084/m9.figshare.11452176.v1
title: Dimensional design of the barometric leg of a flotation column: a key to operational stability

description: Abstract The inefficiency in controlling the slurry/froth interface level of a scavenger column flotation stage was severely impairing the process performance of an iron mining company, increasing the iron content in the tailings to levels above 20% and, consequently, not meeting the company's iron recovery and pellet feed production targets. Based on mass balance and process data, hydraulic calculations were performed and showed that the installed 6.0" (15.24cm) diameter barometric leg tubes and the control system valve were adequate. An equation to determine the maximum barometric leg height was developed for the flotation column and other calculations showed the necessity to reduce this height from 4.6m to a maximum of 3.4m. The barometric leg adequacy considerably decreased the variability in controlling the slurry/froth interface level, reduced the iron content in the tailings from 24.9% to 18.9% and increased the iron recovery in the flotation stage from 97.9% to 98.7%.