Judul: Peningkatan Produktivitas Proses Budidaya Karet Alam dengan Pendekatan Green Productivity (Studi Kasus di PT. XYZ)
Abstrak: Indonesia is the second largest natural rubber producer in the world, with 28% of the total world production in 2010. In line with the growth of the world's automotive industry, the needs of rubber as a complementary synthetic rubber products will also increase. The main objective this research was to find the best alternative strategy to increase the productivity of the natural bber plantations through the green productivity (GP) approach. The case study was conducted at PT. XYZ, a private company which runs in the plantation and processing of natural rubber usinesses. The material flow analysis was performed by using green stream map to analyze the seven Treen wastes. The best alternative strategy was determined by using of AHP model and several design Improvements scenario. The measurement of the alternative strategy performance was rated as the ture GPI and compared with the value of current GPI, which had been calculated on a case study hat was done. The results of this research will be able to provide the best improvement productivity rategy, the level of company's productivity which has been achived, and the productivity levels of The implementation strategy chosen.
Keyword: AHP, Green productivity, Green stream map, Green wastes, Natural rubber, Latex

Judul: Peningkatan Produktivitas Bahan Olah Karet pada Perkebunan Karet Rakyat dengan Pendekatan Produktivitas Hijau
Abstrak: Low productivity and quality of pre-processed rubber and lack of environmental consideration is the main obstacle in the development of the rubber industry. The main objective of this research was to obtain productivity improvement formulation of pre-processed rubber with green productivity approach. Research applied 3 stages of analysis. First, institutional analysis in the smallholder plantations using ISM to identify the contextual relationships between subelemen where farmers are the most important element. Second, production process analysis by mapping each stream process using GVSM and the initial GPI calculation. Third, pre-processed rubber quality analysis using QFD, and produced raw materials handling activities and freezing latex, need to be considered in producing a quality pre-processed rubber. After further analysis to obtain productivity improvement formulation, AHP then applied to weigh the improvement alternative. Based on the overall analysis, the best scenario obtained a GPI value of 1.875. It is better compared to the initial GPI of 1.138
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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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