Judul: Community Interaction and Potential of Useful Plants in Pancoran Mas Grand Forest Park, Depok.
Abstrak: Taman Hutan Raya (Tahura) Pancoran Mas pada awalnya merupakan kawasan Cagar Alam yang telah ada sejak ±300 tahun yang lalu dan merupakan CA pertama di Indonesia. Meskipun keberadaannya sangat penting dalam sejarah perkembangan kawasan konservasi di Indonesia namun perhatian baik dari pihak pengelola maupun masyarakat di sekitarnya masih terbilang rendah. Penelitian ini bertujuan untuk mengidentifikasi interaksi masyarakat terhadap Tahura Pancoran Mas, komposisi vegetasi dan potensi spesies tumbuhan berguna yang terdapat di Tahura Pancoran Mas. Penelitian ini diharapkan dapat menjadi acuan pengelola dalam pengembangan kawasan serta menjadi informasi bagi masyarakat sekitar Tahura. Metode yang digunakan dalam penelitian ini terdiri dari wawancara dan analisis vegetasi. Pemilihan responden dalam wawancara menggunakan metode purposive sampling dengan jumlah responden sebanyak 30 orang. Analisis vegetasi dilakukan dengan metode jalur berpetak dengan total luasan petak contoh sebesar 2 ha. Hasil penelitian menunjukkan sebanyak 83,34% responden mengetahui spesies tumbuhan yang ada di sekitar pinggir Tahura namun hanya 36,7% responden pernah memanfaatkan tumbuhan. Berdasarkan hasil analisis vegetasi teridentifikasi 83 spesies dan 43 famili di Tahura Pancoran Mas dengan komposisi vegetasi pada tingkat pohon terdapat 27 spesies, tiang 23 spesies, pancang 12 spesies, semai 12 spesies, tumbuhan bawah 30 spesies, dan liana 4 spesies. Indeks Nilai Penting (INP) tertinggi pada tingkat pertumbuhan pohon, tiang, pancang, dan semai masing-masing dimiliki oleh spesies Arthocarpus elastica (56,52%), Macaranga rhizinoides (48,86%), Grewia acuminata (31,52%), dan Melicope lunuankeda (56,58%). Tumbuhan bawah didominasi oleh spesies Dioscorea aculeata (19,43%) dan liana didominasi spesies Spatholobus littoralis (93.54%). Keberadaan spesies tumbuhan dari marga Macaranga dan Mallotus mengindikasikan bahwa habitat di dalam kawasan sudah terganggu. Secara keseluruhan teridentifikasi 67 spesies dan 39 famili tumbuhan berguna dengan kelompok kegunaan tumbuhan obat mendominansi yaitu sebanyak 43 spesies. Kesimpulan dari penelitian ini adalah interaksi masyarakat dengan tumbuhan di dalam kawasan masih rendah dan terdapat potensi tumbuhan berguna di dalam kawasan yang dapat dimanfaatkan masyarakat sekitar. Saran yang dapat diberikan antara lain adalah pengenalan fungsi dan manfaat kawasan, pengelolaan yang lebih intensif, serta pengembangan kawasan Tahura Pancoran Mas agar keberadaannya tetap terjaga.
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Judul: Inventarisasi Potensi Tumbuhan di Taman Hutan Raya Inten Dewata, Sumedang-Jawa Barat
Abstrak: Grant Forest Park (TAHURA) Inten Dewata has riches of plants as many as 250 species. There are two districts surrounding the area of TAHURA Inten Dewata; Kota Kulon and Pasanggrahaan. Local people in those districts may have interaction with yhe area of TAHURA Inten Dewata, therefore a study of Stocktaking of plant Potential in TAHURA Inten Dewata is badly needed. Stocktaking of plant Potential in TAHURA Inten Dewata was done from May to July 2010. The methods used are field survey with the technique of analysis of vegetation and interviewing by using questionaires as well as herbarium techniques to identify plants. Data analysis was conducted using descriptive statistical techniques including graphical and tabular data. According to the result of analysis vegetation and the interview with the society around the area of TAHURA Inten Dewata, it was found that there were 154 species of plants that belong to 59 families. The total result of plant species based on the analysis of vegetation, it was found that there were 132 species based on the analysis of vegetation belong to 54 families with details specified; 113 species belong to 51 families in Mount Palasari and 27 species belong to 26 families found in Mount Kunci. The society exploits or makes use of 83 species of plants that belong to 35 families in TAHURA Inten Dewata. Species of plants exploited in Mount Palasari are 81 species and 2 species in Mount Kunci. There are 14 groups of usage of plant species which is used to fulfill the daily need. The most usage of plants is for firewood, namely 25 species, whereas the less, 1 species, is for cosmetic. The biggest interaction with TAHURA Inten Dewata of local people is in Gunung Palasari as the access to this area is relatively easier than Gunung Kunci that is boundary with fort. The society around the area make use of plants in TAHURA Inten Dewata. The species that are made use of by local people in TAHURA Inten Dewata such as sugar palm (Arenga Pinnata), coconut (Cocos nucifera), teak (Tectona grandis), bamboo (Gigantochloa apus), and mahagoni (Swietenia mahagoni) that are used for daily need.
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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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