Judul: Evaluasi Kinerja Gapoktan Mekarmukti dan Dampaknya terhadap Petani Cabai Anggota di Kecamatan Cibinong, Kabupaten Cianjur, Jawa Barat
Abstrak: The presence of farmers institution could be the key to improve welfare and economies of scale in the village for farmers. As its function, farmers institution could be a forum of farmers for improving quality, quantity, and continuity of their crops togetherness. Farmers institution also could be balancing the bargaining position between small farmers and marketing farmers then food estates. This research aims to assess the performance of farmers institution in Mekarmukti Village, Cibinong District, Cianjur, West Java in farmers group level as a forum of farmers and Farmers Group Associaton (FGA) level which could be improving the economies of scale and act as supporting institutions other agribusiness subsystem in agribusiness system of chili. This research also measured an impact from FGA and farmers group to farmers so that establish a hierarchy system which synergize for farmer’s welfare. Performance analysis measured with descriptive statistical analysis and impact analysis measured with nonparametical statistic, Wilcoxon Paired Test. Result, Mekarmukti FGA have a success rate performance of 72,73 percent and farmers group in associated with it have rate in the range below. Mekarmukti FGA also impact positively in 17 variabels from 23 tested variabels. In conclusion, FGA and farmers group in associated with are important for member farmers because of have a good performance and and positive impact. However, Mekarmukti FGA and farmers group in associated with still have to improve the performance which not optimally yet and reducting the negative impact.
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Judul: Analisis Kinerja Kelembagaan dan Pendapatan Usahatani Manggis Kelompok Tani Karya Mekar di Desa Karacak Leuwiliang
Abstrak: Farmer’s group is one of agribusiness institution, which is located in the region of the countryside. This institution is expected plays an important role in every farming activity. However, there are still many farmers groups that do not run according to the function. This research aims at analysing the performance of the Karya Mekar Farmers Group and the influence of the institution against the success of mangosteen farming on farmer members in Karacak Village Leuwiliang. The result of this research showed that Karya Mekar Farmers Group had not been running optimally yet. This because there were things that didn’t suit well such as things that related to market existence and credit system on farmers’ group that didn’t work well yet. Karya Mekar Farmers Group also played the role in the success of farming on its members. This could be seen from the result of farming income and the R/C ratio which higher than non-group farmers
Keyword: Leuwiliang, Karya Mekar, institutional, farmers’ group

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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