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This study investigated the relationship between gender, school type, school location, personality, and winning a medal among participants of the two largest student competitions in Indonesia, the National Science Competition (KSN) and the Entrepreneur-based Student National Competition (FIKSI), sponsored by the Indonesian Ministry of Education and Culture. Survey data were collected from 684 participants in KSN and 169 participants in FIKSI. The chi-square test and the logistic regression were employed using Jeffey's Amazing Statistics Program (JASP) ver. 13. The results revealed a substantial relationship between gender, school location, school type, and personality on winning a medal in KSN, but none in FIKSI. Results also revealed that male participants and participants from Java and private schools were more likely to win medals in KSN than female participants and participants from outside Java and public schools. This study also found that neuroticism has a statistically significant relationship toward receiving a medal in KSN.

Carbon black from waste of tire industry has potential to be recycled through two steps i.e. pyrolysis and demineralization. The treatment without and with pyrolysis prior to demineralization is done to identify the effect of temperatures on agglomerate size, morphology, elemental analysis, and surface function group. Based on DTA analysis, temperatures at 225 and 410 °C were chosen to show the difference of effect from decomposing organic in material of waste. This research reported that increasing temperature pyrolysis could decrease agglomerate size. However, the agglomerate size of carbon black recycled was larger than carbon black waste caused by carbonaceous which form from pyrolysis. In addition, pyrolysis gave effect on surface function group of carbon black recycled and morphology. Increasing temperature pyrolysis could activate surface function group. It is showed by absorption with medium/strong intensity at 1382.96 and 1381.03 cm as C-O stretching of carboxyl group in carbon black recycled at 410 °C seemed carbon black standard N660. IR spectrum of carbon black waste before and after treatment without and with pyrolysis at 225 °C showed weak intensity at 1382.96, 1382.96, and 1386.82, respectively as stretching of aromatic compounds. Pyrolysis at high temperature (410 °C) could form agglomerate which has uniform pores. After demineralization, inorganic impurities such as Zn could be removed by acid solution using hydrochloric acid 1 M for 2 h. [ABSTRACT FROM AUTHOR]