Judul: Sifat Hujan Extrim Pada Pusat Wilayah Pertanian di Jawa Barat
Abstrak: Issues concerning global warming and climate change has become a hot discussion in various circles. The impact is already felt in various places on the earth's surface in recent years, from drought, landslides, floods and other extreme events. It is therefore necessary that appropriate measures for adaptation and mitigation to minimize that impact. The research was conducted in order to identify the nature of extreme rainfall in West Java, know the distribution of trends and statistical properties of rainfall distribution, grouping according to the nature of the agricultural region ektrimnya rain. by using the Index Series Wet Days (DHB) and the maximum index series Dry Days (DHK). To the north coast of West Java in general DHK is longer than its southern region, and tends to increase. While the DHB is generally not much changed, except a few in some places.
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Judul: Analisis Data Hujan di Beberapa Wilayah Sungai Jawa Bagian Barat
Abstrak: Rainfall information is an important component in meteorological studies. While the availability of rainfall data nowadays is not easy to be accessed yet. Many researchers use interpolation method to obtain the rainfall data. Data resulted from interpolation or downscaling method sometimes less represent the actual rainfall happening on the surface. Therefore, this study aimed to get the character of rainfall in several watershed areas in Western Java by using rainfall data analysis method based on watershed, altitude, and distance between stations. The rainfall character in Western Java based on river area and watershed could be seen from the characteristics of the data in each station where the rainfall data from year to year had large variability, and from the characteristics of the data between stations showed a strong relation with the maximum correlation value and p-value >0.05 to the accumulation of rainfall data in 30-days. The character formed by the altitude variation of station showed that there wasn’t a clear effect of altitude to rainfall yet. Factors affecting rainfall were dominated by the station location which situated on the windward side and near coastal areas. Based on the distance between stations, ratio of the distance to the rainfall difference percentage in the lowland either in the sea near the coast or the inland area indicated a trend of raising in rainfall percentage difference due to the addition of the distance between stations. However, stations located in the mountainous region showed a trend of reduction in rainfall percentage due to the distance addition between stations.
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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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