Judul: Pemetaan Hutan Rakyat Menggunakan Teknik Sistem Informasi Geografis (SIG) di Kecamatan Rumpin, Kabupaten Bogor Tahun 2020.
Abstrak: Informasi mengenai luas dan sebaran hutan rakyat di Kecamatan Rumpin perlu diperbaharui, sebab masih sedikit penelitian mengenai hutan rakyat di Kecamatan Rumpin. Salah satu solusi yang dapat diterapkan adalah dengan penggunaan teknologi penginderaan jarak jauh yaitu sistem informasi geografis agar dapat mengidentifikasi kondisi fisik hutan rakyat secara cepat, akurat, efisien, dan meliputi cakupan yang luas serta dengan biaya yang relatif murah. Tujuan penelitian ini adalah memetakan hutan rakyat di Kecamatan Rumpin Kabupaten Bogor dengan menggunakan teknik Sistem Informasi Geografis (SIG). Identifikasi dilakukan secara visual untuk menentukan jumlah kelas tutupan lahan dan uji akurasi menggunakan matrik kontingensi (confusion matriks)dari hasil ground check di lapangan. Hasil interpretasi visual citra menggunakan citra Landsat 8 OLI dan pengamatan langsung di lapangan, terdapat 8 kategori kelas tutupan lahan yang ada di Kecamatan Rumpin meliputi badan air, sawah, semak belukar, hutan rakyat, pertanian lahan kering, hutan tanaman, lahan terbangun, dan lahan terbuka. Hasil klasifikasi hutan rakyat yang terdapat pada Kecamatan Rumpin memilki luas sebesar 7327,44 ha. Hasil uji akurasi menunjukkan nilai kappa accuracy sebesar 84,38%, dan nilai overall accuracy sebesar 87,36%., Information regarding the area and distribution of community forests in Rumpin Subdistrict needs to be updated, because there is still little research on community forests in Rumpin subdistrict. One solution that can be applied is the use of remote sensing technology, namely a geographic information system in order to identify the physical condition of community forests quickly, accurately, efficiently, and covering a wide range and at a relatively low cost. The purpose of this study was to map community forests in Rumpin District, Bogor Regency using Geographical Information Systems (GIS) techniques. Identification is done visually to determine the number of land cover classes and the accuracy test uses a contingency matrix (confusion matrix) from the results of ground checks in the field. The results of visual image interpretation using Landsat 8 OLI imagery and direct observation in the field, there are 8 categories of land cover classes in Rumpin District including water bodies, rice fields, shrubs, community forests, dry land agriculture, plantation forests, built-up land, and land. open. The results of the community forest classification found in Rumpin District have an area of 7327.44 ha. The results of the accuracy test showed the kappa accuracy value was 84.38%, and the overall accuracy value was 87.36%.
Keyword: Community Forest, Mapping, Rumpin District, Visual Interpretation

Judul: Pemetaan Potensi Hutan Rakyat Menggunakan Teknik Gis Di Kecamatan Sambirejo Kabupaten Sragen Tahun 2014
Abstrak: Peningkatan permintaan kayu menjadi peluang tumbuhnya potensi hutan rakyat. Guna mendukung pengelolaan hutan rakyat berkelanjutan diperlukan ketersediaan data aktual. Penelitian ini mengidentifikasi potensi aktual hutan rakyat di Kecamatan Sambirejo, Kabupaten Sragen melalui teknik inventarisasi berbasis sistem infomasi geografis (GIS). Tujuan utama penelitian ini adalah untuk menghitung, memetakan, dan menganalisis sebaran potensi hutan rakyat menggunakan citra Landsat 8 (OLI). Metode pengambilan data potensi tegakan dilakukan secara purpossive sampling, sedangkan klasifikasi tutupan lahan dan analisis sebaran luas hutan rakyat dilakukan melalui interpretasi visual. Hasil interpretasi visual citra Landsat 8 (OLI) menghasilkan 7 kelas tutupan lahan meliputi badan air, hutan negara, hutan rakyat, lahan terbangun, rumput, sawah, dan tambang. Hutan rakyat memiliki luas lahan sebesar 1307.08 ha dengan nilai potensi per hektar sebesar 58.34 m3/ha dan potensi total sebesar 76 249.67 m3.
Keyword: hutan rakyat, interpretasi visual, pemetaan, potensi tegakan, sistem informasi geografis

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.
Keyword: