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The efficiency of using tapioca
starch as a natural coagulant on semiconductor wastewater treatment was
investigated. The silica content in the wastewater was pH dependent and it was found that the reduction of COD and turbidity occurred
at pH between 12 and 14 with measurements below 100 mg/L and 100 NTU
respectively. A three-level factorial design
experiment in the Response Surface Methodology (RSM) was applied to determine
the influence of retention time and dosage of the tapioca starch. The
parameters studied were chemical oxygen demand (COD), turbidity and total
suspended solids (TSS). The R2 for turbidity, COD and TSS were 0.92,
0.92 and 0.77 respectively. Results indicate that the dosage of the tapioca
starch has a higher influence on COD and turbidity reduction. Tapioca starch as
a natural coagulant has shown that the optimum turbidity reduction was 99% at a
settling time of 30 minutes with dosage of 0.1 g/L. The COD reduction was
achieved at 87% after 60 min of retention time and 0.1 g/L of dosage while
higher coagulant dosages reduced the TSS concentration to 10.9 mg/L at
retention time between 50 to 60 minutes.
This paper explains the Mundell-Fleming
model in the context of Emerging Asia economies management of capital mobility.
Central Banks and Financial Regulators in Emerging Asia adopt a modified
version of the model that incorporates two vital levers, a policy driven and
a market driven method that is adaptable to the magnitude of capital flow. A
policy combination mix of both policy and market driven provides smooth monetary policy signal transmission
to exchange rates.
The present study aimed to reveal the role of neuroticism on the relationship between self-esteem and aggressive emotion. We conducted a cross-sectional study in which a battery of self-report questionnaires was used to assess self-esteem, neuroticism and aggressive emotion in 1085 Chinese adolescents (N = 1085, Mage = 16.38 years, 753 boys). We found that self-esteem could make a negative prediction of aggressive emotion both in males and females. And also, we found the mediating role of neuroticism was in both males and females, on the relations between self-esteem and aggressive emotion, especially, the moderating role of neuroticism among males in the aspect of relationship between self-esteem and aggressive emotion. In conclusion, neuroticism was of importance for aggressive emotion, which was conducive to interventions. According to these findings, at the same time, implications and limitations were discussed in the content.