Judul: Studi Kelayakan Usaha Budidaya Ulat Sutera (Bombix mori L.) di Kecamatan Sukanagara, Kabupaten Cianjur, Provinsi Jawa Barat
Abstrak: Agro-industry activities of natural silk are intended to meet the demand for products made from silkworm thread and to increase the people's income. The demand for products made from silk threads both at home and abroad continues to increase from year to year. The world’s need for silk thread reaches 118,000 tons, while the domestic demand accounts for 700 tons. The world silk production decreased to 52,342 tons and Indonesia only produced 81.5 tons of silk yarn. This study aimed to determine the business feasibility based on non-financial aspects, financial aspects as well as determine its level of sensitivity. The study was conducted in Sukanagara District, Cianjur Regency from April 15 to May 15, 2010. The primary data were obtained through interviews with respondents and field observations. The secondary data were collected through interviews and traces of documents and other printed materials. The data were processed using Microsoft Excel 2007 software. The analysis was carried out for non-financial aspects (aspects of markets and marketing, technical and technological, management, human resource, social, judicial, and environment), and financial aspects (Net Present Value (NPV), Benefit-Cost Ratio Gross (gross B/C), Internal Rate of Return (IRR) and Pay Back Period (PBP)), as well as sensitivity analysis within the period of 10 years with the interest rate of 12%. Based on the resulted analysis of non-financial aspects, the silk worm farming is feasible. The financial analysis was based on three business scales of land area, namely business scale I (1 ha of mulberry), scale II (1.5 ha of mulberry), and scale III (2 ha of mulberry). Based on the business feasibility criteria, the silk worms farming businesses of scale I and II are feasible with NPV of Rp 8,688,681 and Rp 7,202,019; gross B/C of 1.17 and 1.08; IRR values of 33.99% and 20.55% and PBP of 2.75 years and 4.13 years respectively. Meanwhile the business scale III of silk worms is considered feasible if the development scenario is conducted by improving the farming of silk worm as many as 24 boxes/year with a NPV of Rp 12,649,681; gross B/C of 1.12; IRR of 26.06%, and PBP of 3.44 years. The cocoon price decrease of 10% is more influential (sensitive to) on the business condition rather than an increase of 10% in the operational cost. Silk worm businesses of scale I and III with the development scenarios remain feasible to operate despite a decline of 10% in cocoon price and an increased operating cost of 10%, whereas the silk worm business of scale II is not feasible to do.
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Judul: Analisis kelayakan fiannsial budidaya ulat sutera (studi kasus pada koperasi petani pengrajin ulat sutera sabilulungan III, Kecamatan Sukaresik, Kabupaten Tasikmalaya, Jawa Barat)
Abstrak: Sericulture are planting the mulberry as silkworm feed, producing the silkworm eggs and maintaining of silkworm till to fornlating the cacoon. It like a household business that relatively easy because it have a simple technology and intensive labour. The aim of this research were analyzed the characteristic of silkwomi farmer and analyzed feasibility of sericulture. The study was carried out on March 2006 at Silkworm Farmer Cooperation Sabilvlungan I11 and it was designed as a case study. It used primary and secondary data. The analysis data were descriptive and feasibility analysis. The silkwornl Iarnler were divided to three business scale according to square of mulberry garden. The characteristic of sikworm farmer were age, education level, experienced of sericulture, earning and status of land. Feasibility analysis is formulated based on two assum?tion. Follnulating of two assumption is adjusted to the real condition at research place. First, counting the cash flow without land rent and wage of fanlily's labour. This assumption showed that the sericulture is feasibled to ran with discount rate 12%. But, in second assumption that counting cash flow with land rent and wage of fmily's labour, it showed that sericulture is unfeasibled to ran with same discount rate 12%. Key Words : silkwornz, sericulturc., feasibility analysis
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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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