Judul: Rencana pengelolaan lanskap pasca tambang untuk kawasan agroforestri di PT. Arutmin Indonesia Tambang Senakin, Kalimantan Selatan
Abstrak: Kondisi lanskap pasca tambang pada pertambangan terbuka biasanya sudah tidak produktif. Masalah utamanya adalah degradasi lingkungan dan kimia tanah yang mempengaruhi kualitas tanah, air, dan lebih jauh lagi pada masalah perubahan morfologi dan topografi. Tujuan penelitian ini adalah melakukan evaluasi dan manajemen bio-fisik lahan. Dalam mencapai peningkatan kualitas lahan, digunakan pendekatan analisis kesesuaian lahan untuk tujuan pertanian yang telah dikembangkan oleh FAO 1983. Prinsipnya adalah memandingkan antara karakteristik lahan dengan tipe penggunaan lahan yang menjadi preferensi dari perusahaan tambang dan masyarakat. Tipe penggunaan lahannya adalah untuk kawasan agroforestri dengan karet (Hevea brassiliensis) sebagai tanaman utama. Beberapa faktor pembatas lahan adalah pH tanah, tingkat kejenuhan basa, kandungan bahan organik, dan topografi pada area tertentu. Seluas 213,84 ha diusulkan untuk dikelola oleh masyarakat Desa Manggis dan 87,63 ha harus dijadikan area lindung termasuk danau seluas 57 ha. Terdapat tiga kombinasi tipe penggunan lahan dengan sistem agroforestri diantaranya karet dengan padi gogo (235,93 ha), karet dengan kunyit (11,89 ha), dan karet dengan rambutan dan durian (7,6 ha).
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, Agroforest landscape, Hevea brassiliensis, Land characteristic, Land utilization type, Physic-biophysic management

Judul: Rencana Pengelolaan Lanskap Pasca Tambang untuk Kawasan Agroforestri di PT. Arutmin Indonesia Tambang Senakin, Kalimantan Selatan
Abstrak: Condition of open pit post-mining usually has not productive. The main problem is environment degradation and soil chemistry which affect soil quality, water quality, and furthermore morphology and topography changing. The ojective of this research is to evaluate and manage biophysics. To achieve land improvements, used approach to analyze land suitability for agriculture purpose which has developed by FAO 1983. Principally, it compares land characteristics and land utilization type as preferences by corporate and local society. Land utilization type is for agroforestry area with Hevea brassiliensis as a main crops. There were some limiting factors which was found: pH, soil base saturation, organic content, and topography in some areas. Around 213,84 hectares was proposed to be managed by local society in Manggis village and 87,63 hectares must be conserved included lake for 57 hectares. There were three combinations of agroforestry, those are Hevea brassiliensis with Oryza sativa (235.93 ha), Hevea brassiliensis with Curcuma oomestica (11.89 ha), and Hevea brassiliensis with Nephelium lappaceum and Durio zibethinus (7.6 ha).
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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