Judul: Effects of the Price Increase of Soybean on Profitability of Small and Micro Businesses Sanan, Tempe Chips, Malang City.
Abstrak: Salah satu komoditas yang membuat Indonesia bergantung pada impor agar ketersediaannya selalu ada adalah kedelai. Akibatnya harga kedelai impor tidak terjaga kestabilannya. Kenaikan harga kedelai impor di dalam negeri disebabkan beberapa faktor seperti melemahnya nilai tukar rupiah terhadap dolar dan kenaikan harga kedelai di pasar dunia. Dampak naiknya harga kedelai adalah berkurangnya profitabilitas UMKM keripik tempe pada masing-masing skala usaha. Tujuan dari penelitian ini untuk mengetahui profitabilitas masing-masing skala usaha dan mengetahui skala usaha yang paling bertahan pada penurunan ukuran tempe. Profitabilitas usaha dihitung dengan perhitungan titik impas, Marginal Income Ratio (MIR) dan Marginal of Safety (MOS) serta dilakukan perhitungan analisis sensitivitas untuk mengetahui skala usaha yang paling bertahan pada penurunan ukuran tempe. Hasil yang diperoleh adalah usaha dengan kapasitas produksi keripik tempe paling besar tidak memiliki profitabilitas tertinggi dan tidak tahan terhadap penurunan ukuran tempe. Usaha mikro lebih menguntungkan dan lebih mampu bertahan jika dibandingkan dengan usaha kecil.
Keyword: Bogor Agricultural University, Institut Pertanian Bogor, IPB, MOS, MIR, Business scale, Sensitivity analysis, UMKM, Break even point, Smail enterprises, Small businesses, Soybean

Judul: Analisis Pengaruh Kenaikan Harga Kedelai Terhadap Kinerja Usaha Industri Tempe di Desa Citeureup Kabupaten Bogor
Abstrak: Soybean demand continues to increase but does not meet sufficient domestic production resulting in higher price shock. An increase in soybean prices caused a major influence on tempeh industry in Indonesia, since soybean is the main input of tempeh,. The aims of this research were to analyze the effects of the increasing soybean price on business performance in terms of cost structure, revenue, profit, and efforts to deal with adjustments made under these conditions. This research was conducted from December 2012 to Februari 2013. This research used primary data from direct interviews with respondents and secondary data from relevant institutions and literature. The analysis tools used are quantitative and qualitative analysis. The results indicated that an increase in soybean prices affected rising of the total cost significantly because 70 percent of the cost was used for the purchase of soybeans. The condition led to decrease the amount of profit earned. Based on the comparison of the cost structure of the three production-scale showed there was a trend that an increasing of business scale will decrease the cost per kg of soybeans. It is concluded that an adjustment has to be undertaken in order to get high profit by reducing the size and increasing the price of tempeh
Keyword: 

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: