Judul: Resiko pertanian indonesia: persepsi petani terhadap resiko pertanian (studi kasus: petani tanaman pangan di Wilayah Bogor)
Abstrak: Agricultural risks are a serious matter faced by farmers. The objectives of this study were to identify agricultural risks and risks scores at farm households based on the perception of food crop farmers and to develop effective strategies to deal with agricultural risks. The study was conducted from May to September 2011 in Bogor areas. The analysis methods used in this study were qualitative-descriptive, FGD, SWOT, IE and QSPM. The results showed that based on farmers' perceptions, the agricultural risks included production risks, market risks, human risks, institutional risks and financial risks. The highest impact of the risks on farm was the production risk, mainly influenced by pests and diseases. Risk management strategies implemented by farmers were through the use of inputs. Meanwhile, if there was a failure that interfered with family income and the sustainability of farming, farmers would choose to use the income from off-farm work, or to borrow from other parties as a manifestation of risk management strategies. The results of the study also showed that farming activities in Bogor areas were in a stable position. Alternative strategies that need to be considered in coping with agriculture risks were that the government should: (1) be consistent with agricultural policies that had been issued, (2) strengthen the agribusiness development program, (3) encourage investment in agribusiness of food crops subsector, (4) perform the intensification and diversification of agricultural activities, (5) consolidate farmers through institutional development of farmers’ groups and institutional partnership (contract farming), and (6) protect the rights of farmers by legislation and regulation.
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Judul: Analisis Pengetahuan, Persepsi, dan Sikap Pemangku Kebijakan Terhadap Perlindungan Lahan Pertanian Pangan Berkelanjutan di Kabupaten Bogor
Abstrak: The objective of this study are to analyze production, availability and consumption especially rice, to analyze land availability, and to analyze stakeholders’ knowledge, perception and attitude of agricultural land protection in Bogor District. The study found that average of rice production in Bogor District remains droped until 0.18% a year. The average of rice availability can suffice 64.6% rice consumtion in region, while the rest 35.4% was imported from other district. Food consumption pattern of carbohydrate fulfillment dominated by rice (75.7%) this equal to 275.8 g/cap/day or 100.67 kg/cap/year, so that dietary food pattern score remain 72.5. Land rice production prediction was designed with several scenarios showed that the 4th scenario was the best scenario. Stakeholder’s knowledge and perception was different to land conservation and affect to attitude to land conservation. In addition, attitude on agricultural land protection was depending on different interest that has to be facilitated by the stakeholders.
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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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