Self-Cleaning Ability of the Middle and Lower Courses of the Uberaba River, Upgrh-Gd8

Salla, Marcio Ricardo; Ferreira, Andrezza Marques; Pereira, Carlos Eugênio; Schmidt, Márcio Augusto Reolon

doi:10.4090/juee.2014.v8n1.118133

Cited by 8 publications

(20 citation statements)

References 19 publications

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“…Supported by easy internet access on communication devices and computers, this will make it easier for users to search for entertainment features, especially games. Addiction is a form of behavioral or substance dependence (Alam et al, 2014). Game addiction is defined as the use of an excessive computer or video games and or because of the constant encouragement that causes social or emotional problems (Soleymani et al, 2016).…”

Section: Research Backgroundmentioning

confidence: 99%

Online Game, Addiction and Learning Achievement of Senior High School Students in Jakarta

Anggraeni¹,

Wihardja²

2020

IJDS

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Online game problems being a global concern because of the risk of having a negative impact in school-age children. Game online addiction is the excessive use of computers or video games due to urges that cause social or emotional problems. This research aims to identify the relationship between online game problems and learning achievement in senior high school students in Jakarta. This research is a quantitative study with a Cross-Sectional approach. The sampling method uses a technique of purposive sampling. The number of respondents in this study was 95 senior high school students at x public school, Central of Jakarta. The result of the bivariate analysis showed that there was no significant relationship between online gaming problems and learning achievement of a high school students in Jakarta (p-value = 0.242). The implication of this research shows that online gaming problems are not the only factor that can affect the learning achievement of high school children. The other factors that are likely to influence children's learning achievement include self-motivation, family social support, and the school social environment. Recommendation for parents to supervise their children in using gadgets and the school can strengthen the rules for using gadgets in schools.

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Section: Research Backgroundmentioning

confidence: 99%

Online Game, Addiction and Learning Achievement of Senior High School Students in Jakarta

Anggraeni¹,

Wihardja²

2020

IJDS

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“…28, e27 k an (0.01-0.2 day -1 ), K oa (0.2-0.4 day -1 ) and K P (0.01 day -1 ). In comparison with Salla et al (2014a), we believe the discrepancies of the coefficients are related to the source of the water quality data. While Salla et al (2014a) used water quality data from monitoring by a company contracted by the municipal water and sewer department and by the Institute for Management of Mineral Waters, we used our own data obtained in the field.…”

Section: Estimated and Calibrated State Variablesmentioning

confidence: 87%

“…Because of the scarcity of historical water quality data in Brazil, many studies of self-purification in lotic environments estimate the state variables based on fixed values and empirical equations from the literature, related to the morphological and hydraulic characteristics of the channel, previous river water quality and quality of the effluent released. However, according to Salla et al (2014a), mathematical modeling satisfactorily reflects the self-purification process when these variables are calibrated against water quality data from monitoring the stretch of the river of interest.…”

Section: Comparison Of the Water Quality Model With Calibrated State mentioning

confidence: 99%

Importance of calibration for mathematical modeling of self-purification of lotic environments

et al. 2016

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Aim To demonstrate the importance of calibration in mathematical modeling of self-purification in lotic environments, this study simulated the behavior of various parameters in a river with average annual flows between 4.0 and 32.0 m3.s-1, in a segment downstream from the entry of treated wastewater from a sewage treatment station (average monthly flow of 2.1 m3.s-1). Methods Numerical solution by finite difference of the advection-diffusion equation was used to study the dispersion and to quantify and monitor the evolution over time of the parameters DO, BOD5, Ptotal, NH3, NO3- and the levels of the heavy metals cadmium, chromium, copper, lead and zinc. The longitudinal behavior of the water quality parameters simulated by calibrating the state variables was compared with the behavior of the same parameters simulated via state variables available in the literature. The sensitivity of the state variables was also analyzed. Results The calibration process led to good fits between the simulated and actual data for all the parameters analyzed. On the other hand, the comparison of the water quality model using calibrated state variables with the model based on state variables obtained in the literature revealed inconsistencies regarding the parameters DO, Ptotal, ammonia, nitrate and all the heavy metals. Conclusions Considering the wide threshold ranges of the state variables in the literature and the dearth of studies on calibrating the coefficient of decay and quantifying the release of heavy metals by bottom sediment, this study can serve as a base for future investigations in lotic environments with similar hydraulic and water quality characteristics.

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“…Estes avanços viabilizam melhor gestão de recursos hídricos em escala de bacia hidrográfica. Segundo Ferreira (2014), o gerenciamento desses recursos hídricos tem sido elemento de discussão na comunidade científica e política, sendo observados conflitos pelo uso destes em locais em que a vazão se torna restritiva durante um período do ano, como é o caso em algumas regiões do semiárido do Brasil.…”

Section: Lista De Figurasunclassified

“…De acordo com Ferreira (2014), para o entendimento dos processos físicos, químicos e biológicos, sobre a dinâmica dos nutrientes nos ecossistemas, é necessário considerar que estes se encontram disponíveis na massa líquida e são utilizados a nível celular pelos microrganismos para que ocorram os metabolismos essenciais. Estes, por sua vez, são passíveis das interferências físicas do meio ambiente.…”

Section: Autodepuração Dos Corpos D'águaunclassified

Interferência do uso e ocupação do solo na qualidade da água em bacia hidrográfica com disponibilidade hídrica crítica

Guimarães

Salla

Pereira

et al.

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pela resolução apenas no cenário 6, com valor de 4,33 mg/L, onde considerou-se 80% de área total para a agricultura. Em todos os cenários, os parâmetros DBO, fósforo total e Escherichia coli mantiveram-se acima do máximo permitido pela resolução. No cenário 6, o qual é o mais crítico entre os analisados, as concentrações de DBO, fósforo total, E. Coli apresentaram 11,95 mg/L, 0,55 mg/L, 1,46×10 11 NMP/100mL, respectivamente. De uma forma geral, o estudo retrata a importância da simulação de cenários de uso e ocupação do solo para o planejamento e gestão de recursos hídricos em escala de bacia hidrográfica na preservação da qualidade da água superficial.

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Self-Cleaning Ability of the Middle and Lower Courses of the Uberaba River, Upgrh-Gd8

Cited by 8 publications

References 19 publications

Online Game, Addiction and Learning Achievement of Senior High School Students in Jakarta

Online Game, Addiction and Learning Achievement of Senior High School Students in Jakarta

Importance of calibration for mathematical modeling of self-purification of lotic environments

Interferência do uso e ocupação do solo na qualidade da água em bacia hidrográfica com disponibilidade hídrica crítica

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