Digital Video Festivals and Mathematics: Changes in the Classroom of the 21st Century

Nilton Silveira Domingues,Marcelo C. Borba 대한수학교육학회 2021 수학교육학연구 Vol.31 No.3

This paper aims to present how video production is impacting the classroom, mathematics students and teachers in Brazil, as well as mathematics knowledge production developed with this media. Digital video Festivals with mathematical content are being implemented in Brazil, locally and nationally. One of them is Mathematics Education Digital Video Festival, organized by the Research Group in Informatics, Other Media and Mathematics Education, GPIMEM. In this century, video is earning space as a pedagogical approach in either face-to-face or distance education, even before the COVID-19 pandemic. Currently, considering social distance, the use of videos became an imposed reality to students and teachers. Students and teachers with different level of experience or age started to realize possible positive effects regarding the reorganization of the classroom by the presence of mathematical videos. However, other aspects provided negative effects: for example, inequalities in homes and mobile access impacted equal opportunity to all. This paper will summarize the use of mathematical video in the last century and discuss what is happening this century. We will revise some research developed, mainly in Brazil, that shows how the classroom does not fit in a parallelepiped model. Internet, videos and software combined are “things” that have agency and are co-participating in learning and teaching mathematics. The organization of festivals of videos have become important not only in Brazil but elsewhere in many formats either nationally or internationally, in a way to create challenges, exhibitions, cultural mix that aim to show mathematics applications to the general public. In particular, this article reports on parts of a qualitative research that investigated participants of the first edition of the referred national festival. As a result, we look for the comprehension of following the discussions of qualitative transformations regarding the use of videos in classrooms and mathematics knowledge production, as this new setting suggests that digital technologies arrived in XXI century to collaborate with learning. This article will be supported by a theoretical perspective on technology based on the notion of humans-with- media. In such a perspective knowledge is seen as being constructed by humans and different media and different artifacts. This article shows how such a perspective may help us to cope with the classroom of the XXI century, including the classroom that during the pandemic include students’ and teachers’ homes.

The causal relationships between stock prices and macroeconomic variables in Brazil during the period 1995-2004

Nilton Clovis Machado de Arauj,Andrea Camozzato,Yoon, Taek-Dong 한국외국어대학교 중남미연구소 2020 중남미연구 Vol.39 No.1

During the period 1995-2004 the market capitalization of the Brazilian stock market rose from 22.2 % to 51.2% of the GDP and this market suffered several qualitative changes. These changes require a better understanding of the Brazilian stock market characteristics, in particular with respect to its efficiency in processing the information about macroeconomic variables. With this aim, the paper analyses the relationship between a set of macroeconomic variables (industrial production index, price index, interest rate, monetary offer and country risk) and the stock prices during the period from 1995 to 2004, using monthly data. The methodology used to test the informational efficiency of the Brazilian stock market is based on Granger causality tests between the macroeconomic variables and the São Paulo Stock Exchange Index (IBOVESPA). The method used is the one proposed by Toda and Yamamoto (1995). The results show that the Brazilian stock market is not information efficient in relation to the price index, short-run real interest rate and country risk. In the case of country risk (EMBI+) the market was able to anticipate some information, but could not process efficiently all the relevant information about this variable. In contrast, the market is efficient in relation to monetary offer and industrial production index. These results are consistent with the conclusions of similar studies about the Brazilian stock market as well as the stock markets of other developing countries, with regard to the incapacity of these markets to process efficiently most of the relevant macroeconomic information.

Endovascular treatment of residual or recurrent intracranial aneurysms after surgical clipping

da Silva Júnior Nilton Rocha,Trivelato Felipe Padovani,Nakiri Guilherme Seizem,Rezende Marco Túlio Salles,de Castro-Afonso Luís Henrique,Abud Thiago Giansante,Vanzin José Ricardo,Manzato Luciano Bambi 대한뇌혈관외과학회 2021 Journal of Cerebrovascular and Endovascular Neuros Vol.23 No.3

Objective Total aneurysm occlusion is crucial for the prevention of rebleeding of a ruptured aneurysm or to avoid rupture of an unruptured lesion. Both surgical and endovascular embolization fail to achieve complete aneurysm occlusion in all the cases. The objective of the study was to establish the safety and efficacy of endovascular treatment for previously clipped residual or recurrent aneurysms. Methods This was an observational, retrospective study of patients harboring incompletely occluded intracranial aneurysms after clipping who underwent endovascular treatment. Patients were treated using 4 different techniques: (1) simple coiling, (2) balloon remodeling, (3) stent-assisted coiling, and (4) flow diversion. Analyses were performed to identify predictors of total aneurysm occlusion, recanalization and complications. Results Between May 2010 and September 2018, 70 patients harboring incompletely occluded intracranial aneurysms after clipping met the inclusion criteria in 5 centers. The mean residual aneurysm size was 7.5 mm. Fifty-nine aneurysms were unruptured. Total aneurysm occlusion was achieved in 75.3% of the aneurysms after 1 year. All aneurysms treated with flow diversion revealed complete occlusion according to control angiography. Recanalization was observed in 14.5%. Permanent morbidity and mortality occurred in 2.9% and 1.4% of the patients, respectively. Conclusions Endovascular treatment of recurrent or residual aneurysms after surgical clipping was safe and efficacious. Flow diversion seems to be associated with better anatomical results. A more rigid study, a larger group of patients, and long-term follow-up are required to provide stronger conclusions about the best approach for residual clipped aneurysms.

The Music Within: A Doppler Harmonic Pattern Report in Non-Subarachnoid Hemorrhage Related Cerebral Vasospasm

Alessandra Braga Cruz Guedes de Morais,George Nilton Nunes Mendes,Ana Silvia Sobreira Lima Verde,Adson Freitas de Lucena,Francisco José Arruda Mont’Alverne,Fabricio Oliveira Lima,Fernanda Martins Maia 대한신경초음파학회 2023 대한신경초음파학회지 (JNN) Vol.15 No.2

A 40-year-old male presented an episode of severe thunderclap headache with right hemiparesis. Imaging revealed severe stenosis in the left middle cerebral artery, associated with increased mean velocities detected by Transcranial Doppler Ultrasound (TCD). Notably, a distinctive "tin whistle" sound, known as a doppler harmonic effect, near the highest velocity point was observed during the examination. Extensive workup was performed, including CSF analysis and laboratory investigations, and the diagnosis of Reversible Cerebral Vasoconstriction Syndrome (RCVS) was established. Treatment involving medication and daily monitoring led to a decline in the left MCA's velocity, enabling the patient's discharge with no recurrent headaches or neurological deficits. Notably, a follow-up MRI exhibited the disappearance of the left MCA stenosis. This report discusses the rare occurrence of "musical murmurs" in cerebrovascular diseases, underscoring the potential for early diagnosis using techniques like TCD in emergency settings, particularly in conditions like RCVs.

Total Applied Energy Versus Cavitation Intensity: How Soil Aggregate Stability Can be Accessed Using Ultrasound?

Bruno Ribeiro,Jose Lima,Geraldo Oliveira,Nilton Curi,Erika Silva,Bruno Silva 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Impaired Health-Related Quality of Life in Brazilian Children with Chronic Abdominal Pain: A Cross-Sectional Study

Jesus, Carine Dias Ferreira de,Carvalho, Mary de Assis,Machado, Nilton Carlos The Korean Society of Pediatric Gastroenterology 2022 Pediatric gastroenterology, hepatology & nutrition Vol.25 No.6

Purpose: We compared the health-related quality of life (HRQOL) of children and adolescents with functional abdominal pain disorders (FAPDs) and organic abdominal pain disorders (ORGDs). Methods: This was a single-center, cross-sectional, observational study. The PedsQL 4.0 generic cores scales parent proxy-report was administered to parents/caregivers of 130 and 56 pediatric patients with FAPDs and ORGDs respectively on their first visit. The self-reported pain intensity in the patients was assessed using a visual analog scale (VAS) and facial affective scale (FAS). Results: Irritable bowel syndrome was the most prevalent FAPDs, and the most prevalent ORGDs were reflux esophagitis (41.1%) and gastritis associated with Helicobacter pylori (21.4%). There was no difference in HRQOL among patients diagnosed with ORGDs and FAPDs (p>0.05). Patients with ORGDs and FAPDs had lower HRQOL Scale scores than healthy Brazilian and American children's references, with a high proportion of children at risk for impaired HRQOL (p<0.0001). There was no difference in the VAS and the FAS scores between the ORGDs and the FAPDs. FAPDs had a higher prevalence of girls' and couples' disagreement (p<0.02), although poor school performance (p<0.0007) and bullying (p<0.01) were higher in patients with ORGD. Conclusion: This study revealed that there was a difference in impaired HRQOL between patients with ORGDs and FAPDs. Thus, considering the high prevalence of chronic abdominal pain in children, a well-founded treatment plan is necessary for a multidisciplinary cognitive-behavioral Pain management program.

Effect of lipid source and emulsifier on productive and physiological parameters of broilers

Tenório Karine Isabela,Eyng Cinthia,do Amaral Duarte Cristiane Regina,Vianna Nunes Ricardo,Broch Jomara,Rohloff Júnior Nilton,Köhler Tânia Luiza,Hagdon Cirilo Edinan 아세아·태평양축산학회 2022 Animal Bioscience Vol.35 No.1

Objective: This study aimed to evaluate the replacement of degummed soybean oil (DSO) by acid soybean oil (ASO) in diets with or without the inclusion of emulsifier on broiler performance, relative organ weight, lipase activity, intestinal morphometry, and nutrient digestibility. Methods: A total of 704 1-day-old male broiler chicks were allotted to a 2×2 completely randomized factorial design (with or without emulsifier × two lipid sources [ASO and DSO]), with eight replicates and 22 birds each. The metabolizable energy level in diets with emulsifier was reduced by 40 kcal/kg from 1 to 21 d and 50 kcal/kg from 22 to 49 d. Results: Broilers fed diets containing ASO without emulsifier had higher (p = 0.005) weight gain than DSO-fed animals and with the inclusion of emulsifier had worse (p = 0.018) feed conversion ratio (FCR). Birds fed diets with emulsifier worsened FCR regardless of lipid source from 1 to 21 days (p = 0.006) and from 1 to 49 days (p = 0.0002). There was an increase (p = 0.026) in the relative pancreas weight, at 14 days, in birds fed diets containing ASO. Lipase activity and morphometry of the duodenum and jejunum, at 14 and 21 days, were not affected (p>0.05). The dietary inclusion of emulsifier improved the digestible energy (p = 0.053) in the presence of ASO. For the digestibility coefficients (gross energy, crude protein, and mineral matter), no interference was observed (p>0.05). Conclusion: The inclusion of emulsifier to energy-restricted diet with ASO maintained broiler performance in the first week, but worsened FCR in subsequent phases. The ASO can be considered as an alternative lipid source to DSO and does not interfere with the morphophysiological characteristics and performance of broilers. The combination of ASO and emulsifier increased the digestible energy content by 6.2%. Objective: This study aimed to evaluate the replacement of degummed soybean oil (DSO) by acid soybean oil (ASO) in diets with or without the inclusion of emulsifier on broiler performance, relative organ weight, lipase activity, intestinal morphometry, and nutrient digestibility.Methods: A total of 704 1-day-old male broiler chicks were allotted to a 2×2 completely randomized factorial design (with or without emulsifier × two lipid sources [ASO and DSO]), with eight replicates and 22 birds each. The metabolizable energy level in diets with emulsifier was reduced by 40 kcal/kg from 1 to 21 d and 50 kcal/kg from 22 to 49 d.Results: Broilers fed diets containing ASO without emulsifier had higher (p = 0.005) weight gain than DSO-fed animals and with the inclusion of emulsifier had worse (p = 0.018) feed conversion ratio (FCR). Birds fed diets with emulsifier worsened FCR regardless of lipid source from 1 to 21 days (p = 0.006) and from 1 to 49 days (p = 0.0002). There was an increase (p = 0.026) in the relative pancreas weight, at 14 days, in birds fed diets containing ASO. Lipase activity and morphometry of the duodenum and jejunum, at 14 and 21 days, were not affected (p>0.05). The dietary inclusion of emulsifier improved the digestible energy (p = 0.053) in the presence of ASO. For the digestibility coefficients (gross energy, crude protein, and mineral matter), no interference was observed (p>0.05).Conclusion: The inclusion of emulsifier to energy-restricted diet with ASO maintained broiler performance in the first week, but worsened FCR in subsequent phases. The ASO can be considered as an alternative lipid source to DSO and does not interfere with the morphophysiological characteristics and performance of broilers. The combination of ASO and emulsifier increased the digestible energy content by 6.2%.

Water Erosion in Planted Forest under Different Management Systems in Brazil

Marx Silva,Bernardo Candido,Junior Avanzi,Mayesse Silva,Anna Oliveira,Danielle Guimaraes,Barbara Silva,Pedro Batista,Sergio Martins,Nilton Curi 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6