Judul: Identifikasi Lokasi Potensial Bendungan di DAS Ciliwung Hulu.
Abstrak: Sungai Ciliwung merupakan salah satu penyebab utama banjir yang terjadi di Jakarta. Hal ini dikarenakan limpasan air yang mengalir melebihi kapasitas, terutama air yang berasal dari hulu sungai sehingga perlu penanganan agar debit yang mengalir ke hilir berkurang. Penelitian ini bertujuan mengidentifikasi lokasi dan kapasitas tampungan bendungan potensial di hulu Sungai Ciliwung dengan menggunakan analisis hidrologi SWAT (Soil and Water Assessment Tool) pada software ArcGIS (Arc Geographic Information System). Didapatkan daerah yang berpotensi untuk bendungan adalah daerah pada elevasi rendah dengan anak sungai yang memiliki banyak cabang sungai (orde ke-4 atau orde ke-5) dan memiliki kemiringan maksimal 25%. Tiga titik lokasi yang potensial yaitu pada koordinat (1) 06°38'51.6" LS dan 106°53'15.7" BT, (2) 06°39'21" LS dan 106°53'36" BT, serta (3) 06°39'22" LS dan 106°52'15,5" BT. Lokasi 3 memiliki debit rata-rata bulanan tertinggi >30 m3/s sedangkan lokasi 1 memiliki debit ratarata bulanan terendah yaitu > 6 m3/s. Bendungan 1 memiliki luas 90.90 ha; bendungan 2 luasnya 25.74 ha; dan luas bendungan 3 yaitu 21.69 ha. Volume yang dapat ditampung oleh masing-masing bendungan adalah 49.739,330 m3, 8,813,621 m3 dan 8,106,605 m3. Sehingga ketiga lokasi tersebut potensial untuk bendungan.
Keyword: Analisis Hidrologi, ArcGIS, Bendungan, Ciliwung Hulu, SWAT

Judul: Analisis Jaringan Sungai Ciliwung Hulu untuk Menentukan Hidrograf Banjir
Abstrak: Hydrograph is a graphical representation of flow with time. Hydrograph shape is determined by the rainfall input and morphometry of the watershed. Upper Ciliwung watershed contributes greatly to the floods that hit Jakarta. This study aimed to determine the characteristics of the Upper Ciliwung river networks and analyze the flood hydrograph pattern formed by the river network density. Determination of the characteristics of stream network is based on SRTM DEM 90 m x 90 m, and it is obtained that the Upper Ciliwung river has four Strahler river order with length ratio (RL) and branching ratio (Rb) that were different for each river order . Flood hydrograph was calculated using geomorphology convolution method and the simulated discharges were compared to observed discharges recorded at the Katulampa station for two rainfall events on January 16, 2013 and March 4, 2013. Based on the values of Nash-Sutcliffe coefficient obtained from the comparison of simulated discharge and observed discharges that were 0.72 for January 16, 2013 flood and 0.66 for March 4, 2013 flood, it is concluded that flood could be determined using geomorphology convolution method based on the river network density from SRTM DEM data.
Keyword: SRTM DEM data, River network characteristics, Geomorphology convolution method

Judul: Synthesis of Apatite - Chitosan Composite Using Duck Eggshell and Chitosan with Temperature and pH Control
Abstrak: Composite of apatite-chitosan was prepared by using chitosan as polymer matrix. Calcium phosphate was prepared from CaO and (NH4)2HPO4, which the ratio Ca : P had to be 1.67. Chitosan is produced by deacetilase from biopolymer chitin. Duck eggshell (95% CaCO3) as starting material was converted to be calcium oxide (CaO) through calcinations with temperature 1000oC for 5 hours. In-situ and ex-situ methods were prepared from apatite and chitosan (dissolved with acetate acid 2%). Calcium phosphate prepared for bone implantation, but it is too fragile and brittle to be implant into the body. So addition of chitosan can decrease crystalinity and increase mechanic characteristic (tougher). Composite apatite-chitosan was resulted by fast precipitation. Fast precipitation was held in a breaker glass with nitrogen atmosphere, under controlled temperature at 37oC and pH 7, in order to increase amount of hydroxyapatite. Precipitation with CaO which was dropped by (NH4)2HPO4. Hydroxyapatite and chitosan were appearing at samples with in-situ and ex-situ methods which indicating by peak matching of XRD (closed lattice parameter, crystal size), overlapping at FTIR spectra and supporting by SEM picture (homogenous and agglomerated particle). However, it still needs further research to examine biocompatibility osteoconductive degree of sample by in-vivo and in-vitro test.
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