Judul: Analisis Nilai Tambah Cokelat Batangan (Chocolate Bar) di Pipiltin Cocoa, Kebayoran Baru, Jakarta Selatan
Abstrak: Indonesia is the third largest world cocoa producer. Previously, Indonesia is just an exportir of cocoa beans. Producer of processing cocoa product is dominated by European countries. Although cocoa beans as a main raw product of chocolate was not produced in Europe. Thus, Indonesia should change their role from being a cocoa beans exporter to a cocoa finished product exporter. Indonesian government start to support manufacturing of cocoa beans by implementing export tax policy. The result of that policy is cocoa beans export volume decreased and increased in domestic cocoa industry capacity. Unfortunately, cocoa manufacturing industry is still more dominated by international companies such as Nestle, Marz, JB Cocoa Malaysia, and others than domestic small and medium enterprise. Nowadays, the most of small and medium enterprise produce compound chocolate and semi finished chocolate. For a long time, added value of cocoa beans processing was still enjoyed by international companies. One of small and medium enterprise in producing real chocolate from local cocoa beans is Pipiltin Cocoa in Kebayoran Baru, South Jakarta. Pipiltin Cocoa produce main product which is chocolate bar with local cocoa beans from Aceh and Bali. This research use two methods: Hayami and Syahza in counting added value. The result of this research showed that value added of chocolate bar by Pipiltin Cocoa as much as Rp 289 000 per kg cocoa beans which is used in production. Based on calculation result, added value of Pipiltin Cocoa’s chocolate bar which was analyzed by Hayami method is same as the results of added value calculation by using Syahza method.
Keyword: added value, chocolate industry, chocolate, Cocoa beans

Judul: Business Plan of Chocolate Bar Industry in Bogor
Abstrak: Cacao is an important agroindustrial product of Indonesia. Most of Indonesian cacao is exported in form of cacao beans. In contrast, the market of processed cacao such chocolate bars is filled by imported products. The purpose of this research is to make a business plan of chocolate bar company. The research scope includes studying market and marketing aspect, technological aspect, management and organizational aspect, and also financial aspect of a chocolate bar company in Bogor. The data collection methods used are interviews and documents and other secondary data collections. The data are mainly analized using investment analysis such as NPV, IRR, payback period, and risk analysis. The chocolate bar company is located in Cijeruk, Bogor, considering the access to available milk supply as an important raw material, while the location also has satisfactory infrastructure, human resource, and access to markets. The factory capacity is 1000 kg per day. The main raw materials are cocoa liquor and cocoa butter, supplied from a company from Tangerang. The company needs 33 workers. In terms of environment concerns, the company will only produces very small number of solid and liquid waste, which are safe for environment. The total investment needed is Rp. 6.737.746.660,- consisting of fixed asset investment Rp. 5.825.673.700,- and working capital Rp. 912.072.960,-. The NPV value is positive Rp. 5.387.822.787,-. The IRR is 22 percent. The Net B / C value is 1,80. The Payback period is 5,66 years. The investment figures show that the company is feasible to set up.
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: