Judul: Analisis Profitabilitas Usaha dan Nilai Tambah Produk Pada Usaha Keripik Singkong Geprek Di Kabupaten Bogor
Abstrak: Cassava chips is one of the processed cassava, which is one of snack. The average of cassava chips in Bogor was done in small and medium scale enterprises that go into home industry. The purpose of this study are analyzing the profitability in 2014, analyzing the value added in 2014, and seeing the the effect of the increasing price on the level of profitability and value added in 2015 with projecting from 2014 of profitability and value added in 2015 with projecting from 2014 of cassava chips ma’nyos of Mr.Unandar.This study was conducted using a survey method. The location was done intentionallyby selecting the business unit cassava chips ma’nyos of Mr.Unandar. The results show that the business is able to generate profits. Value profitability of cassava chips ma’nyos of Mr Unandar is 26.1 percent for 150 and 75 gram, 28.3 pertcent for 130 gram, 25.2 percent for 500 gram, and 4.1 for 20 gram.The analysis shows that the value added of cassava chips of Mr Unandar is 7 013 rupiah with ratio of value added 27 percent.
Keyword: Bogor Agricultural University, value added, cassava chips, profitability, Home industry

Judul: Added Value and Profitability of Cassava Processing Business (Case Study: Pak Bendot's Cassava Processing Business, Pekanbaru City)
Abstrak: Cassava is an agricultural product that can be processed into various foods. Cassava in Indonesia is available almost all year round and the price is cheap. This has caused many entrepreneurs, especially Micro and Small Enterprises (UMK) interested to open a food business with cassava as raw material. Pak Bendot's Cassava Processing Business is an example of a micro small business in Pekanbaru, Riau, which processes fresh cassava into dodol and balado chips. This business will be developed by the local government into icon of Pekanbaru. Therefore, this study aims to analyze the added value and profitability of the cassava processing business with Pak Bendot's Cassava Processing Business as the case. Hayami Method showed that the added value ratio of cassava processed into balado chips was higher than the dodol. Profitability analysis using break even point, MOS, and MIR shows that this business is profitable. This business operates above the break-even point with the profitability of processing dodol 42.86% and balado chips 68.12%. This business is sensitive to the increase in the price of its main costs. The increase of business until 100% shows that this business is still profitable., Ubi kayu merupakan produk pertanian yang dapat diolah menjadi aneka makanan. Ubi kayu di Indonesia tersedia hampir sepanjang tahun dan harganya relatif murah. Hal tersebut menyebabkan banyak pengusaha makanan, khususnya Usaha Mikro dan Kecil (UMK) tertarik untuk membuka usaha makanan dengan bahan baku ubi kayu. Usaha Olahan Ubi Kayu Pak Bendot merupakan contoh usaha mikro di Kota Pekanbaru, Provinsi Riau, yang mengolah ubi kayu segar menjadi dodol dan keripik balado. Produk usaha ini akan dikembangkan oleh pemerintah daerah menjadi ikon Kota Pekanbaru. Oleh karena itu, penelitian ini bertujuan menganalisis nilai tambah dan profitabilitas usaha pengolahan ubi kayu dengan Usaha Olahan Ubi Kayu Pak Bendot sebagai kasus. Perhitungan menggunakan Metode Hayami menunjukkan bahwa rasio nilai tambah ubi kayu yang diolah menjadi keripik balado lebih besar dibandingkan yang diolah menjadi dodol. Analisis profitabilitas menggunakan indikator break even point, MOS, dan MIR menunjukkan bahwa usaha ini menguntungkan. Usaha ini beroperasi di atas titik impas dengan profitabilitas pengolahan dodol sebesar 42,86% dan keripik balado 68,12%. Usaha ini sensitif terhadap kenaikan harga ubi kayu, bahan penolong, dan upah tenaga kerja. Pengembangan kapasitas produksi sebesar 100% menunjukkan bahwa usaha ini masih menguntungkan.
Keyword: cassava processing business, profitability, sensitivity, value added

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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