Judul: Perbandingan Kelestarian Hutan Rakyat Bersertifikat dan Tidak Bersertifikat di Kabupaten Kulonprogo
Abstrak: Forest community certification is an instrument to achieve sustainability forest management in ecology, economy, and social aspects. The objective of this study was to obtain forest management data based on ecology, business feasibility, and organizational in groups that have been certified and uncertified. The research was conducted in two locations of Kulonprogo Regency, that were Kaliagung Village, District of Sentolo that represent of uncertified forest community management unit (Marsudi Boga) and Banjararum Village, District of Kalibawang which represent of certified forest community management unit Koperasi Wana Lestari Menoreh (KWLM). The average income contribution of certified forest community (KWLM) was Rp 25 961 264/ha/year and uncertified forest community (Marsudi Boga) was Rp 6 688 540/ha/year. Carbon stock potential of certified community forests (KWLM) was 27.035 tones C/ha and uncertified forest community (Marsudi Boga) was 22.375 tones C/ha. Hence certified forest community provided better benefits in the form of higher carbon stock and average income.
Keyword: Bogor Agricultural University (IPB), Certification, Community forest

Judul: Analisis Finansial Pengelolaaan Hutan Rakyat Sertifikasi di Kecamatan Sambirejo, Kabupaten Sragen
Abstrak: Certification community forest is managed forests by communities with sustainable management system and approved by international ecolabel. Forest certification have implemented in different community forests, District Sambirejo, Sragen in 2009. The purpose of this study is comparing financially Jati business management of forest certification between community forest farmer who get the assist from local government budget and private effort community forest, as well as to identify farmer’s perceptions toward the influence of forest certification. Local government budget community forest management and private effort community forest either 10 or 20 year cycle are equally viable because it has a value of NPV > 0, BCR values > 1 and IRR > interest rates. Local government budget community forest management of 20 years cycle is considered the most profitable than others who have a NPV value of Rp. 97 546 135 million. Farmers feel the absence of changes specifically from the forest certification if in terms of economic aspect , but farmers feel the better environmental changes for forest people center after the forest certification.
Keyword: Bogor Agricultural University (IPB), certification and perception, community forest, financial analysis

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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