Judul: Pengembangan Model Telekoneksi antara Kejadian El-Niño dengan IOD dan Pengaruhnya Terhadap Fluktuasi Curah Hujan di Daerah Sentra Produksi Pangan (Studi Kasus : Sukamandi dan Padang Panjang).
Abstrak: Geoss4th (Global Earth Observation System to System) Asia-Pacific Symposium, March 2010 in Bali, suggested that teleconnection between all the global climate data and their impacts to the rainfall variability over Indonesia, especially between SST Nino 3.4 and IOD when both phenomena come simultaneously in the same time is very important to be investigated comprehensively. Based on that suggestion, this paper objective is to develop a model that can explain how teleconnection between El-Niño and IOD influence rainfall fluctuation in Indonesia. Location that used in this paper are Sukamandi and Padang Panjang, those are food centre region in Indonesia. First point of this paper is short term analysis. Methods to accomplish the goal of this analysis are spectral analysis and cross correlation. The idea is to combine Anomaly SST Niño 3.4 with IOD (Niño 3.4+IOD) to form a new index that present teleconnection and then check the cross correlation between Niño 3.4+IOD and rainfall anomaly on two cities mentioned above. The result from cross correlation between those data are the response about teleconnection from those cities are different and also there is a lag time before teleconnection take effect to those cities. After the short term analysis is complete, which is analyze response of two cities to teleconnection, it was continued by long term analysis. The target of this analysis is to develop a model from Niño3.4+IOD, the model is used as a precursor when will the teleconnection will have a very bad effect to our climate. This analysis is done by using ARIMA (Autoregressive Integrated Moving Average) method. The result of this analysis is an ARIMA(p,d,q) equation that can predict until few next month, so preventive action can be taken to minimalise the impact of long wet season or long dry season
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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: 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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