Judul: Pembuatan Model Database Register Petak di IUPHHKHA PT. Mamberamo Alasmandiri, Provinsi Papua.
Abstrak: The forest area development is necessary for the first step of forest management, this stage was aimed to arrange the annual compartments. The compartment is needed to make a register set containing the forest characteristic database on each compartment. Because of the importance of data and information on the every compartment, a database model for Geographic Information System (GIS) is needed. Geographic Information System (GIS) enables us to provide actual and accurate information on forest condition to manage. The aim of the research is to develop database modeling from every compartment at IUPHHK-HA of PT. Mamberamo Alasmandiri. The result of this research are expected to be used as database from every compartment by IUPHHK-HA PT. Mamberamo Alasmandiri to support further forest management activities. The method used in this research was image selection the timeseries ortho rectified landsat image from 2000-2012 derived from LAPAN as a base map, non production area identification, forest area management, RKT block management, compartment management to sub-compartment, and database modeling development subsequently. PT. Mamberamo Alasmandiri consist of production and non production area, this area division was marked as sub-compartment. The non production areaof PT. Mamberamo Alasmandiri consist of conservation area, infrastuctur of management area infrastructur, restricted area, and residental area. The result of GIS database model consist of register about information management conducted in every compartment and information about the identification non production area. The database could be utilized for monitoring and evaluation of compartment.
Keyword: 

Judul: The Local Volume Table Construction at IUPHHK-HA PT. Mamberamo Alasmandiri Work Area, Papua Province.
Abstrak: Untuk menyusun rencana pengelolaan hutan diperlukan data hasil inventarisasi hutan yang akurat. Keakuratan hasil inventarisasi hutan tergantung kepada beberapa hal, salah satunya adalah tersedianya tabel volume pohon untuk menduga volume pohon berdiri. Tabel volume pohon dibuat berdasarkan persamaan atau model matematis. Penelitian ini bertujuan untuk menyusun tabel volume pohon jenis Pometia pinnata di areal kerja IUPHHK-HA PT. Mamberamo Alasmandiri, Provinsi Papua. Adapun jenis tabel volume pohon yang dibuat adalah tabel volume pohon lokal dengan diameter pohon sebagai peubah bebasnya. Model penduga volume pohon disusun dalam 3 bentuk persamaan regresi dengan diameter sebagai peubah bebas. Model terbaik diperoleh berdasarkan kriteria uji statistik untuk keterandalan dan keabsahan model, yaitu koefisien determinasi (R²), simpangan baku (s), analisa keragaman, akar rata-rata kuadrat simpangan (RMSE), bias, simpangan rata-rata (SR), simpangan agregat (SA), dan uji beda rata-rata khi-kuadrat (χ²). Berdasarkan kriteria tersebut, model penduga volume matoa terbaik adalah V= dengan nilai R² = 97,8%, s = 0,082, Fhitung = 4753,55, RMSE = 30%, bias = 12%, SR = 21%, SA = 13,5%, dan χ²=6,115.
Keyword: 

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: