Judul: El Niño Modoki dan Dampaknya terhadap Keragaman Curah Hujan Pulau Jawa (Studi Kasus: Kabupaten Indramayu)
Abstrak: Indonesian farmers are currently struggling to face drought probles in the region of rice barn, one of which is Indramayu District located int he Java Island. One of main factors of the drought is perceived that there is warm pool concentrated in the middle of Pacific Ocean the so-called El Niño Modoki. However, its impacts to Indonesia region did not much investigated yet. Hereby, it is necessary to do analysis of the impact of El Niño and El Niño Modoki on Indonesia’s rainfall variability. The study focused on rainfall over 5 areas in Indramayu District, i.e. Bondan, Indramayu, Krangkeng, Anjatan, and Cikedung. Wavelet analysis of sea surface temperature anomaly (SSTA) data Niño 3.4 and El Niño Modoki Index (EMI) along period of January 1979-December 2013 resulted differences in temporal characteristics. The composite rainfall anomalies, SSTA, anomalies of horizontal wind speed at altitude of 850hPa, and the Walker Circulation in the spatially El Niño and the El Niño Modoki years analyzed by GrADS software showed a decline trend of rainfall in the Java Islad along September-October to November (SON). Seasonal rainfall prediction model in the 5 observated areas using CPT software resulted the highest value of the principal component (PC) coefficient with high negative of EMI predictor variables in the SON season, which meant that the current El Niño Modoki caused a decline of rainfall in related season where the biggest influences occured in the Cikedung District (-0.53 ), while the PC coefficient with Niño 3.4 as variable also had high negative value in the SON season with the greatest influences occured in the Krangkeng District (-0.58).
Keyword: Bogor Agricultural University (IPB), Rainfall, El Niño Modoki, El Niño, GrADS, CPT

Judul: El Niño Modoki dan Pengaruhnya Terhadap Perilaku Curah Hujan Monsunal di Indonesia
Abstrak: This study aims to investigate El Niño Modoki phenomenon and its influence to the monsoonal rainfall behavior over Indonesia. The study is also intended to identify the differences between the El Nino Modoki and the well-known El Nino events, referred in this study as Conventional El Niño. By using correlation analysis, it is shown that the El Nino Modoki Index, known as EMI, is strongly correlated with SST anomaly index in Nino-4 region. The correlation coefficient value is 0.57, which is higher than the EMI’s correlations with other SST anomaly indices from different Nino regions, i.e. Nino-1.2, Nino-3 and Nino-4. Temporal analysis on both Nino-4 index and EMI by using Power Spectral Density shows a different strength in the temporal cycle of both indices, where Nino-4 data demonstrates a strong 4-5 year interannual cycles, while EMI is dominated by 6–8 years cycles. This is consistent with the result of Wavelet analysis that indicates four years interannual cycles of Nino-4 index and nearly decadal (~10 years) cycles of EMI data. The composite of seven El Nino Modoki events in 1986/87, 1990/91, 1992/93, 1994/95, 2002/2003, 2004/2005, and 2009/2010, generally shows that the El Nino Modoki events indicated by the raise of EMI exceeding its defined threshold usually occurred from July to March. It is shown by clear characteristics of growing phase starting from March or April until January, and continued by decreasing phase around February. Based on the results of regression analysis, the El Nino Modoki strongly influence monsoonal rainfall over Sumbawa Besar, Makassar, and Banjar Baru during both June-July-August (JJA) and September-October-November (SON) periods, over Lampung only during JJA, and Indramayu during SON. The use of EMI which includes information about the SST anomaly around Indonesia led to a significant cross-correlation values between monsoonal rainfall anomaly and EMI with only maximum of one month lag time.
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Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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