Judul: Analisis Perubahan Penggunaan/Penutupan Lahan di Area Cagar Biosfer Cibodas dalam Mendukung Keberadaan Taman Nasional Gunung Gede Pangrango
Abstrak: Peningkatan jumlah penduduk menyebabkan perubahan penggunaan/penutupan lahan di Cagar Biosfer Cibodas. Salah satu pendekatan untuk menilai konversi penggunaan lahan secara cepat adalah dengan menggunakan teknologi penginderaan jauh. Oleh karena itu, tujuan penelitian ini adalah : (1) menganalisis perubahan penggunaan/tutupan lahan tahun 1999 dan 2011 serta faktor-faktor yang mempengaruhi perubahan penggunaan/tutupan lahan; (2) mengidentifikasi preferensi masyarakat tentang perubahan penggunaan/tutupan lahan yang dapat ditoleransi; (3) memprediksi pendekatan alokasi penggunaan/tutupan lahan dengan Cellular Automata (CA) dan (4) melakukan skenario pengendalian perubahan penggunaan/tutupan lahan di Cagar Biosfer Cibodas yang dapat mendukung kelestarian Taman Nasional Gunung Gede Pangrango. Hasil penelitian menunjukkan bentuk penggunaan lahan pada tahun 1999 didominasi oleh tegalan dan kebun campuran sebesar 44,25% dan pada tahun 2011 dominasi tegalan dan kebun campuran berkurang menjadi 38,16% disertai dengan peningkatan pemukiman dari 16,19% menjadi 20,41 %. Berdasarkan hasil AHP, perubahan penggunaan/tutupan lahan disebabkan oleh pertumbuhan penduduk, sumber pendapatan, kemiringan lereng, elevasi dan jenis tanah. Perubahan penggunaan/tutupan lahan yang dapat ditoleransi oleh masyarakat adalah perubahan hutan menjadi tegalan dan kebun campuran dengan nilai 0,249 atau 24,9%, dan dari tegalan dan kebun campuran menjadi pemukiman dengan nilai 0,206 atau 20,6%. Prediksi penggunaan lahan pada tahun 2023 menunjukkan lahan tegalan dan kebun campuran sebesar 34,34 %, hutan 30,97%, pemukiman 23,39%, tegalan 11,14%, edelweis 0,08%, rerumputan/semak 0,05% dan badan air 0,03%. Ada tiga skenario untuk mengendalikan perubahan penggunaan/tutupan lahan di Cagar Biosfer Cibodas.
Keyword: Perubahan penggunaan/tutupan lahan, cagar biosfer cibodas, taman nasional gunung gede pangrango

Judul: Analisis perubahan penggunaan/penutupan lahan di area cagar biosfer Cibodas dalam mendukung keberadaan taman nasional Gunung Gede Pangrango
Abstrak: An increasing number of population caused land use/land cover change in Cibodas Biosphere Reserve. One of the approach to rapidly assess land use conversion is by using remote sensing technology. Therefore, the purposes of this study are : (1) to analyze land use/land cover change in 1999 and 2011 and the factor that affecting land use/land cover changes; (2) to identify people preference about land use/land cover change that can be tolerated; (3) predicting land use/land cover allocation approach with Cellular Automata (CA) and (4) to conduct controlling scenario land use/land cover changes in the Cibodas Biosphere Reserve that can support the sustainability of Mount Gede Pangrango National Park. The result showed the form of land use in 1999 was dominated by dry field and mixed farms, amounting to 44.25% and in 2011 the dominance of dry field and mixed farms was reduced to 38.16% accompanied with an increase in settlements from 16.19% to 20.41%. Based on AHP result, land use/land cover change is caused by population growth, source of income, slope, elevation and soil type. Land use/land cover change that can be tolerated by society is changing forests into dry field and mixed farms which have a value of 0.249 or 24.9%, and from dry field and mixed farms to residential with a value of 0.206 or 20.6%. Landuse prediction in 2023 show that dry field and mixed farm is 34,34 %, forest 30.97%, settlements 23.39%, fields 11.14%, edelweis 0.08%, grass / shrub 0.05% and 0.03% of water bodies. There is three scenarios to control land use/land cover change in Cibodas Biosphere Reserve.
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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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