Judul: Kontribusi Sektor Kehutanan terhadap Ekonomi Kabupaten Sukabumi
Abstrak: Conventionally, the role of forestry sector in the district of Sukabumi is indicated by its contribution to the Regional Gross Domestic Product (RGDP). However, gross value added that generated from timber industry was not taken into account. This value was included into manufacturing sector. This situation undermined the role of the forestry sector. The objectives of this study are to calculate the contribution of the forestry sector to the RGDP of Sukabumi and to determine policy alternative priority that improve forest sector contribution. The results showed the contribution of forestry sector in the period 2000 to 2011 ranged from 2.40% to 5.36%. This forestry sector is a major sector as indicated by Location Quotient value ranging from 1.05 to 1.44. The multiplier effect values varied from 41.23 to 43.05. The forestry sector was strong and had capability to realize opportunities. Therefore, the chosen strategy should support an aggressive growth policy. Expanding of collaborative and community forest management is the highest priority, followed by developing ecotourism, strengthening timber industry and rehabilitating critical land.
Keyword: policy, AHP, SWOT, RGDP, forestry

Judul: Kontribusi Sub Sektor Kehutanan terhadap Ekonomi Kabupaten Sumedang
Abstrak: Products of forestry sub-sector can be extractive and nonextractive. Sumedang district with a land area of 152,220 hectares is dominated by the agricultural sector amounted to 83.73%, including state forest lands and community forest by 36.24%. The extent of forest land allocation is an advantage for the forestry sub sector in Sumedang district. The results of the contribution analysis indicate that the forestry sub sector contributing 0.53 % - 0.73 % of GDP Sumedang district. Although a small contribution, but the forestry sub sector is a basic sector with value of LQ 3.42 - 5.76. Multiplier effect value of forestry sub sector in 2012 amounted to 45.67. This means that any additional income of Rp. Y in the forestry sub sector, resulting in additional revenue of 45.67 x Rp. Y to the total regional GDP of Sumedang district. SWOT analysis results indicate that suggested policy alternatives are to utilize the existing power to seize opportunities in the forestry sub-sector. Priority is determined using AHP method. As a result, the policy priority is the Development of Ecotourism (PE), followed by PHBM, RLK, PI.
Keyword: SWOT, strategy of forestry policy, multiplier effect, LQ, AHP

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: