Abstract. The background of this research is the use of mild steel (i.e., St37) as anchor chain that works on the corrosive environment of seawater which is possible to decrease its tensile strength. The longer soaked in seawater, the more significant the lowering of its tensile strength. Anchor chain needs to be designed by considering its tensile strength and corrosion resistance, so it's able to support mooring system well. The primary purpose of this research is obtaining the decreasing of stainless steel 304 (AISI 304) tensile strength which is corroded by seawater as anchor chain of the mooring system. It is also essential to obtain the lifetime of AISI304 and St37 as anchor chain with the same load, the corrosion rate of AISI 304, and St 37 in seawater. The method which was employed in this research is an experiment with four pieces of stainless steel AISI 304, and of St 37 corrosion testing samples, six pieces of stainless steel 304, and six pieces of St 37 for tensile testing samples. The result of this research shows that seawater caused stainless steel AISI 304 as anchor chain has decreased of tensile strength about 1.68 % during four weeks. Also, it indicates that AISI 304 as anchor chain has a lifetime about 130 times longer than St 37. Further, we found that the corrosion rate of stainless steel 304 in seawater is 0.2042 mpy in outstanding category, while the St 37 samples reached up to 27.0247 mpy ranked as fair category. This result recommends that AISI 304 more excellence than St 37 as anchor chain of the mooring system.

This study discusses about the level of self-confidence in athletes. Self-confidence in every sport must be possessed by every athlete, especially in individual and team sports. The purpose of this study is to determine the level of self-confidence of athletes in individual and team sports. The method used in this research is quantitative descriptive method. The sample that researcher used was 30 people, each of 15 individual athletes and 15 team athletes who joined UKM at UPI. The approach used is a random sampling approach. The instrument used was a confident questionnaire. The result of this study indicated that the level of self-confidence of individual sports athlete is greater than team sports athlete. It can be concluded that the level of self-confidence in individual sports athlete is greater than the level of self-confidence in team sports athlete. The researcher advise to individual sports athlete and team sports athlete to maintain and to increase their level of self-confidence.