Judul: IDENTIFICATION OF SHALLOW AQUIFER USING GEOELECTRIC METHOD IN CIKARAWANG VILLAGE, DRAMAGA SUB-DISTRICT, BOGOR DISTRICT
Abstrak: Penurunan suplai air bersih di Desa Cikarawang Kecamatan Dramaga juga sering terjadi saat memasuki musim kemarau. Hal ini ditandai dengan menyusutnya suplai air dari sumur-sumur warga setempat. Saat penelitian sumber air bersih di rumah-rumah warga setempat masih mengandalkan sumber air dari sumur akuifer dangkal. Tujuan penelitian ini adalah untuk identifikasi karakteristik akuifer meliputi kedalaman, ketebalan, dan letak akuifer berdasarkan tahanan jenis lapisan tanah. Identifikasi akuifer dilakukan menggunakan metode geolistrik konfigurasi Schlumberger. Pengujian dilakukan di tiga titik dengan panjang bentang elektroda arus 100 m dan elektroda potensial 50 m. Letak akuifer pada masing-masing lokasi secara berturut-turut diduga dapat ditemukan berkisar di kedalaman 3.98 m; 10.5 m; dan 15.8 m. Pemukiman warga yang menggunakan air sumur dangkal di sebelah Timur berdekatan dengan TP3 sangat rawan mengalami penyusutan air sumur karena susunan lapisan permukaan yakni tanah aluvial hanya memiliki ketebalan 0.35 m kemudian terdapat lapisan batuan basal (yang sulit untuk meloloskan air) dengan ketebalan lapisan mencapai 15.45 m., A decrease in the supply of clean water in Cikarawang Village, Dramaga District also often occurs when entering the dry season. This is marked by the reduced supply of water from the wells of local residents. During the research the source of clean water in the homes of local residents still relies on shallow aquifer wells. The purpose of this study was to identify aquifer characteristics including depth, thickness, and location of aquifers based on the resistivity of the soil layers. Aquifer identification was carried out using the Schlumberger configuration geoelectric method. The test was carried out at three points with a current electrode span of 100 m and a potential electrode of 50 m. The location of the aquifers at each location is suspected to be found at a depth of 3.98 m; 10.5m; and 15.8 m respectively. Settlements of residents who use shallow well water in the east adjacent to TP3 are very prone to drawdown well water because the surface consisted alluvial soil with a thickness of 0.35 m, and then basalt rock layer, which difficult to pass water, with a layer depth of up to 15.45 m.
Keyword: aquifer, geoelectric, Schlumberger, well

Judul: Eksplorasi Airtanah Dengan Metode Tahanan Jenis Menggunakan Software Progress V. 3.0 Di Desa Nagrak, Kabupaten Bogor, Jawa Barat
Abstrak: Seiring dengan pertumbuhan penduduk yang begitu pesat di Indonesia, khususnya di kota-kota besar, maka kebutuhan air minum juga meningkat. Penelitian mengenai ketersediaan air baik di permukaan tanah atau bawah tanah haruslah dilakukan untuk mendapatkan susunan mengenai lapisan bumi, agar bisa diketahui ada tidaknya lapisan pembawa air (akuifer), ketebalan dan kedalamannya. Penelitian ini bertujuan untuk mengetahui karakteristik litologi penyusun tanah, posisi akuifer dan ketebalannya, serta sebaran dan pola aliran airtanah di Desa Nagrak, Kecamatan Sukaraja, Kabupaten Bogor, Jawa Barat dengan metode geolistrik, yang kemudian diolah menggunakan software Progress V. 3.0. Berdasarkan penelitian lapisan akuifer terdapat pada tanah yang memiliki karakteristik litologi berupa pasir ataupun batu pasiran. Letak akuifer dangkal di Desa Nagrak berkisar pada kedalaman 2 – 6 m di bawah permukaan tanah. Ketebalan akuifer dangkal berkisar 2 – 3 m. Letak akuifer dalam tidak terdeteksi hingga kedalaman 50 – 75 m.
Keyword: airtanah, akuifer, geolistrik, metode tahanan jenis, Schlumberger

Judul: Penyusunan Overlap Graph menggunakan Suffix Tree pada DNA Sequence
Abstrak: The DNA sequence assembly is very important in genome analysis. This step aims to reconstruct contigous DNA fragment (contigs) from short fragment by concatenating fragments based on the overlap region among them. This method employs overlap graph for solving the problems. In this graph, nodes represent fragments and edges represent overlap. This research developed a software for constructing overlap graph using suffix tree. The evaluation was conducted by measuring the number of nodes, number of edges, and the execution time in many values of minimum overlap. The minimum overlap is defined as the minimum length of substring which is considered as the overlap region between two fragments. The evaluation results showed that the number of nodes, the number of edges, and the execution time were increased with the decreasing of the minimum overlap value.
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