Judul: Kajian Kelayakan dan Strategi Pengembangan Klaster Peternak Sapi Perah di Kecamatan Cisarua, Kabupaten Bogor
Abstrak: Dairy farmer in Sub District Cisarua is expected to be developed as cluster, an integrated dairy farmer from milk production aspects to processing and marketing (on an off farm). Milk processing can be executed by the processing industry or the dairy farmers themselves. This study aims to (1) identify and analyze the components of the cluster, (2) feasibility study of cluster related to increasing of value added of dairy products, and (3) determine the appropriate strategies of business development dairy farmers in Sub District Cisarua, District Bogor. Primary data collected through field surveys and interviews by questionnaires to dairy farmer and other respondent, to obtain supporting data with Non probability method as purposive sampling. Dairy farmers were divided into 3 (three) business scale, namely the ownership of adult cow < 6, 6-10 and > 10. Secondary data collected through literature, documents and related reports. Cluster dairy farmer in Sub District Cisarua formed from the main component of dairy farmers, Primary Cooperation (KUD) Giri Tani, and PT Cimory. Other components are influential in its development is the government, academia, and Dairy Processing Cooperation (KPS) Bogor. Business of dairy farmers in Sub District Cisarua is generally feasible. Average of Pay Back Period (PBP) at 18% interest rate range is 2 years 6 months. Average of Net Benefit/Cost (B/C) 97% of dairy farmers is 2.67. On 2008, 93% of farmers reached Break Event Point (BEP) and on 2009 all farmers reached. Net Present Value (NPV) : Discount Factor (DF) 14% of 97% farmers is positive. NPV;DF 18% of 90% farmer is positive. Average of IRR at NPV1; DF 14% and NPV2; DF Internal Rate of Return (IRR) of 18% is 25.15% for 97% of farmers, higher than interest rate in 2008-2009 (14-15%). Yoghurt processing unit was feasible to develop. The value added of fresh milk into yogurt products is Rp. 1,814,-/l. PBP is 11 months. Net B/C is 3.35. NPV (DF) 14% is positive Rp. 147,150,300. DF NPV of 18% is positive Rp. 95,059,288. IRR is 25.30%. The Development strategies of dairy farmers cluster in Sub District Cisarua are production aspect, market aspects, and information technology aspects.
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Judul: Analisis efisiensi produksi dan peran koperasi terhadap usaha ternak Sapi Perah di Kecamatan Cibungbulang Kabupaten Bogor
Abstrak: Indonesia has a potency to develops the dairy industry in the future, however Indonesia still imports about 73% of its dairy need and produces the 27% remaining domestically (Kementerian Pertanian, 2013). Kawasan Usaha Ternak (KUNAK) Cibungbulang, Bogor District is purposively established by the Koperasi Peternak Susu (KPS) Bogor as a national pilot area of an environmentally friendly dairy farm. Further, it is also expected that its milk production can support national milk supply. However, as the milk production in KUNAK Cibungbulang still highly depends on the input usage, therefore the influencing factors of milk production analyses are interesting to be examined. Moreover, this study also analyses the farmer’s income level, the optimum input usage, and also the dairy cooperative’s role in supporting the farmer’s activity. This study applies the double linear regression which has been transformed into the natural logarithm form, the farm management income analysis, the efficiency analysis of production factor, and the descriptive analysis. The result of the study indicates that the significant production factors which influence the milk production are: the amount of the feed, concentrate, tofu dregs, and workers. The analysis is resulting an evidence of profitable dairy farm. However, it is also important to increase the usage of optimum input and the cooperative roles, thus the KUNAK Cibungbulang can reach its optimum profit. The research found that inputs farm have not been used optimally, even the dairy cooperatives have supported the farms well.
Keyword: Bogor Agricultural University (IPB), optimum input, production factor, milk production, cooperative

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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